RU2430396C1 - Development cartridge - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: proposed development cartridge incorporates electrode element plate arranged to stay in contact with contact area of development displacement within plane of projection when driven tie part is projected in first direction. First axial line that makes development roll axle axis and second axial line that makes inlet gear wheel axis are located in parallel and equidistant in direction from front to rear. Contact plate section is located on second axial line. First line connecting axis around which inlet gear wheel and development roll axle run, and second line connecting contact plate and development roll axle are located in parallel. Distance between first and second axial lines equals distance between first axial line and contact plate.

EFFECT: stable feed of development roll axle.

7 cl, 25 dwg

Description

FIELD OF THE INVENTION

Aspects of this invention relate to a development cartridge for use in imaging devices such as laser printers.

State of the art

A development cartridge, which generally contains toner, is mounted removably in the main body of an image forming apparatus, such as a laser printer. The development cartridge is provided in its own housing with a toner chamber configured to contain toner, an agitator rotatable in the toner chamber, a feed roller configured to supply toner, a developing roller configured to deposit toner on it and adjusting the thickness a layer with a knife configured to form a thin layer of toner on a developing roller.

When the cartridge is set in motion, the manifestations after installation in the main body, the toner in the toner chamber is supplied to the feed roller in accordance with the rotation of the agitator. After that, the toner is supplied to the developing roller in accordance with the rotation of the feed roller. Then, the toner passes between the knife controlling the thickness of the layer and the developing roller in accordance with the rotation of the developing roller and is transferred to the developing roller in the form of a thin layer. A developing bias voltage is applied to the developing roller. An electrostatic latent image formed on a drum with a photoconductive layer appears as a toner carried on a developing roller.

The development cartridge includes a gear configured to drive the developing roller, feed roller, and agitator. For example, Japanese Patent Laid-open Publication No. 2003-295614 describes a gear provided in one side wall of a developing cartridge case. The gear in the development cartridge includes an input gear to which a driving force is supplied from the main body of the image forming apparatus.

On the other side wall of the housing of the development cartridge, there is provided a support member configured to support the end of the developing roller. The supporting element is made integrally with the feeding element, configured to apply a developing bias voltage to the developing roller.

In the development cartridge described in Japanese Patent Laid-open Publication No. 2003-295614, a line parallel to the developing roller shaft passing through the input gear provided on one side wall and another line parallel to the developing roller shaft passing through the feeding element provided on other side wall, are parallel to each other with some distance between them. If a rotational or torsional power is applied to the developing cartridge that creates rotation or torsion of the developing cartridge around the input gear when a driving force is applied to the input gear from the main body of the image forming apparatus, then the power element provided on the other side wall leaves from its position, which leads to poor power supply or insufficient power supply from the main body of the device for image formation Nia.

Summary of the invention

In accordance with aspects of the invention, there is provided a developing cartridge that provides stable power supply or stably supplies power to the shaft of the developing roller, even when the driving force is transmitted directly from the leading connecting part of the image forming apparatus to the driven connecting part of the developing cartridge.

To achieve the above aspects, a development cartridge may include: a housing including a first side wall and a second side wall opposite the first side wall; a developing roller located between the first side wall and the second side wall, wherein the developing roller includes a developing roller shaft rotatable during development, and a developing roller element configured to carry the developing substance thereon, wherein the developing roller element provided located around the shaft of the developing roller, and the shaft of the developing roller rotates around the first center line during development; an electrode located on the first side wall next to the shaft of the developing roller, this electrode being electrically connected to the developing roller element; and a driven connecting part located on the second side wall, this driven connecting part being connected to the leading connecting part of the image forming apparatus and configured to rotate around the second axial line during development. In one aspect, the first center line and the second center line are parallel to each other. At least a portion of the electrode may be positioned so that it intersects the second centerline.

With this design, when rotational or torsional power is applied to the developing cartridge, which rotates or twists the developing cartridge around the driven connecting part, when the driving force from the driving connecting part of the main body of the image forming apparatus is transmitted directly to the driven connecting part, significant impacts can be prevented rotational or torsional power to the electrode, because at least part of the electrode is located so that it crosses second centerline. As a result of this, it is possible to prevent the electrode from coming out of its position. Thus, it is possible to stably supply power to the shaft of the developing roller.

The manifestation cartridge may include: a housing including a first side wall and a second side wall opposite the first side wall; a developing roller located between the first side wall and the second side wall, wherein the developing roller includes a developing roller shaft rotatable during development, and a developing roller element configured to carry the developing substance thereon, wherein the developing roller element provided located around the shaft of the developing roller, and the shaft of the developing shaft rotates around the first axial line during development; an electrode located on the first side wall next to the shaft of the developing roller, this electrode being electrically connected to the developing roller element; and a driven connecting part located on the second side wall, this driven connecting part being connected to the leading connecting part of the image forming apparatus and configured to rotate around the second axial line during development. In one aspect, the first line runs perpendicular to the first center line and intersects the second center line, the second line runs perpendicular to the first center line and intersects at least a portion of the electrode and the second center line. The first distance between the intersection of the first line and the first center line and the intersection of the first line and the second center line may be equal to the second distance between the intersection of the second line and the first center line and the intersection of the second line and the second center line.

With the aforementioned design, when rotational or torsional power is applied to the developing cartridge that generates rotation or torsion of the developing cartridge around the driven connecting part, when the driving force from the driving connecting part of the image forming apparatus main body is transmitted directly to the driven connecting part, significant effects can be prevented rotational or torsional power to the electrode, because the first distance and the second distance are equal. As a result of this, it is possible to prevent the electrode from coming out of its position. Thus, it is possible to stably supply power to the shaft of the developing roller.

The manifestation cartridge may include: a housing including a first side wall and a second side wall opposite the first side wall; a developing roller located between the first side wall and the second side wall, wherein the developing roller includes a developing roller shaft rotatable during development, and a developing roller element configured to carry the developing substance thereon, wherein the developing roller element Provided located around the shaft showing the roller; an electrode located on the first side wall next to the shaft of the developing roller, this electrode being electrically connected to the developing roller element; and a driven connecting part located on the second side wall, and this driven connecting part is connected to the leading connecting part of the image forming apparatus. When the driven coupling part is projected in a direction parallel to the shaft of the developing roller, at least a portion of the electrode may be located within this projection.

With the aforementioned design, when rotational or torsional power is applied to the developing cartridge that generates rotation or torsion of the developing cartridge around the driven connecting part, when the driving force from the driving connecting part of the image forming apparatus main body is transmitted directly to the driven connecting part, significant effects can be prevented rotational or torsional power to the electrode, because at least part of the electrode is located in crystals of said projections when the slave connecting part projected onto the shaft of the developing roller. As a result of this, it is possible to prevent the electrode from coming out of its position. Thus, it is possible to stably supply power to the shaft of the developing roller.

In the development cartridge, at least the end of the developing roller may rest on at least one of the first side wall and the second side wall. As a result, since the developing roller is reliably supported, it is possible to stably supply power to the developing roller element. With this design, at least the end of the developing roller can rest on at least one of the first side wall and the second side wall. Therefore, since the developing roller is reliably supported, it is possible to stably supply power to the developing roller element.

Each end of the developing roller may be supported by a first side wall and a second side wall. With this design, each end of the developing roller can be supported by a first side wall and a second side wall. Therefore, since the developing roller is reliably supported, it is possible to stably supply power to the developing roller element.

At least the end of the developing roller may be supported by an element located adjacent to at least one of the first side wall and the second side wall. With this design, at least the end of the developing roller may rest on an element adjacent to at least one of the first side wall and the second side wall. Therefore, it is possible to efficiently assemble the developing roller with this adjacent element or to effectively mount the roller to it. Since the developing roller is reliably supported, it is possible to stably supply power to the developing roller element.

Each end of the developing roller may be supported by a first element provided adjacent to the first side wall and a second element provided adjacent to the second side wall. With this design, each end of the developing roller can be supported by a first element provided next to the first side wall and a second element provided next to the second side wall. Therefore, it is possible to efficiently assemble the developing roller with this adjacent element or to effectively mount the roller to it. Since the developing roller is reliably supported, it is possible to stably supply power to the developing roller element.

The electrode may be made of metal. With this design, the electrode can be made of metal. Therefore, it is possible to reliably supply power to the electrode.

The electrode may be made of conductive resin. With this design, the electrode can be made of conductive resin. Therefore, it is possible to give the electrode any shape and it is possible to reliably supply power to the developing roller element.

The shaft of the developing roller may include an electrically conductive element. The electrode and the developing roller element can be electrically connected by the developing roller shaft. With this design, the electrode and the developing roller element can be electrically connected via the developing roller shaft. Therefore, it is possible to reliably supply power to the developing roller element.

The shaft of the developing roller may be made of electrically conductive material. With this design, the shaft of the developing roller can be made of electrically conductive material. Therefore, it is possible to reliably supply power from the electrode to the developing roller element.

The shaft of the developing roller may be made of metal. With this design, the shaft of the developing roller can be made of metal. Therefore, it is possible to reliably supply power to the developing roller element.

The electrode may be part of an element that contacts directly with the shaft of the developing roller. With this design, the electrode may be part of an element that contacts directly with the shaft of the developing roller. Therefore, it is possible to reliably supply power to the shaft of the developing roller.

The electrode may indirectly contact the shaft of the developing roller by means of at least one electrically conductive element. With this design, the electrode can indirectly contact the shaft of the developing roller by means of at least one electrically conductive element. Therefore, the relative position of the electrode and the shaft of the developing roller can be selected without limitation. Thus, since the efficiency of the structure is increased, it is possible to reliably supply power from the electrode to the shaft of the developing roller.

An electrode may surround the circumferential portion of the shaft of the developing roller. With this design, the developing roller does not require support on other elements. Thus, it is possible to reduce the number of components used and their cost.

The driven connecting part may include a first cylindrical part and a second cylindrical part located around the first cylindrical part. With this design, the driven connecting part may include a first cylindrical part and a second cylindrical part located around the first cylindrical part. Therefore, the first cylindrical part can reliably perceive the driving force from the leading connecting part. The second cylindrical part can reliably transmit the driving force to the shaft of the developing roller.

The first cylindrical part may be essentially hollow and provided with an inner peripheral surface from which a driven part protrudes, which is engaged with the leading connecting part. With this design, a reliable perception of the driving force from the leading connecting part is possible due to the engagement of the driven part with the leading connecting part.

The first cylindrical portion may include a gear. With this design, the first cylindrical part may include a gear. Therefore, a reliable perception of the driving force from the leading connecting part is possible.

The developing roller may include a gear of the developing roller connected to the shaft of the developing roller rotatably with it. The driven coupling part may include a drive gear that is engaged directly with the gear of the developing roller. With this design, the driven coupling part may include a drive gear that is engaged directly with the gear of the developing roller. Therefore, it is possible to reliably transmit the driving force perceived by the driven connecting part from the leading connecting part to the gear wheel of the developing roller with the driven connecting part. Thus, it is possible to ensure reliable rotation of the developing roller. In addition, with this design, it is possible not to transmit a driving force from the image forming apparatus directly to the gear of the developing roller, and therefore, the developing roller shaft can function as a guide during installation of the developing cartridge. As a result, an additional guide may not be required and the number of components used and their cost can be reduced.

The developing cartridge may further include a feeding roller configured to supply a developing substance to the developing roller, wherein the feeding roller is parallel to the developing roller. The feed roller may include a feed roller shaft configured to rotate during development, a feed roller element configured to feed the developing substance to the developing roller, the feed roller element being provided located around the feed roller shaft, and the feed roller gear connected with the shaft of the feed roller rotatably with him, and the gear wheel of the feed roller is made with the possibility of introducing into engagement with the drive gear. With this design, the gear wheel of the feed roller is adapted to engage with the drive gear. Therefore, the driving force perceived by the driven connecting part from the leading connecting part can be transmitted to the gear of the feed roller with the driven connecting part. In this way, a reliable rotation of the feed roller can be ensured. In addition, with this design, it is possible to transmit a driving force to the gear of the developing roller and the gear of the feed roller with the driven connecting part. Thus, it is possible to provide efficient transmission of the driving force and efficient rotation of the developing roller and the feed roller.

The electrode may be electrically connected to the feed roller shaft. With this design, the electrode can be electrically connected to the shaft of the feed roller. Therefore, power can also be supplied to the feed roller.

The electrode may have a first part configured to surround the circumference of the shaft of the developing roller, and a second part configured to surround the circumference of the shaft of the feed roller. With this design, the developing roller shaft and the feeding roller shaft can be reliably supported on the first part and the second part, respectively.

The electrode may have a contact part configured to contact the supply element of the image forming apparatus, the contact part being located above the first part and the second part. With this design, the electrode may have a contact part located above the first part and the second part. Therefore, the electrode can come into reliable contact with the supply element in the contact part. Thus, it is possible to reliably supply power to the electrode from the image forming apparatus.

It may be possible to install a development cartridge in a photoconductive cartridge including a photoconductive element on which an electrostatic latent image is formed. With this design, the development cartridge can be reliably installed in a photoconductive cartridge including a photoconductive element. Therefore, only the development cartridge can be replaced with a new one according to the residual amount of the developing substance, regardless of the life of the photoconductive element. The photoconductive cartridge can be replaced in accordance with the life of the photoconductive element, regardless of the residual amount of the developing substance contained in the cartridge development.

The development cartridge may further include a protruding portion that contacts the portion under bias provided in the photoconductive cartridge when the development cartridge is installed in the photoconductive cartridge. With this design, when the developing cartridge is installed in the photoconductive cartridge, the protruding portion of the developing cartridge may be in contact with the portion that is under a bias voltage of the photoconductive cartridge, so that the developing cartridge can come into contact with the photoconductive member. Therefore, with reliable contact between the developing cartridge and the photoconductive element, the electrostatic latent image formed on the photoconductive element can be reliably developed using a developing substance carried by the developing roller.

In the development cartridge, the protruding portion may protrude outward from the first side wall and the second side wall. With this design, the protruding part may protrude outward from the first side wall and the second side wall. Therefore, the protruding part can reliably contact the part that is under bias voltage. Thus, reliable contact of the developing roller with the photoconductive element can be guaranteed.

In the development cartridge, the driven connecting part may include a first cylindrical part and a second cylindrical part located around the first cylindrical part. Said projection may be formed by projecting the first cylindrical part. At least a portion of the electrode may be located within the protrusion. With this design, it is possible to further prevent the electrode from leaving its position. Thus, it is possible to reliably supply power to the shaft of the developing roller.

In the development cartridge, the first cylindrical part may be substantially hollow and provided with an inner peripheral surface from which a driven member protrudes, which is engaged with the leading connecting part. With this design, it is possible to reliably perceive the driving force from the leading connecting part due to the engagement of the driven part with the leading connecting part.

The electrode may include a first portion configured to surround the circumferential portion of the shaft of the developing roller. The first part can be made movable with the possibility of contact with the shaft of the developing roller. With this design, it is possible to reliably supply power to the shaft of the developing roller.

The electrode may include a second part attached to the first side wall using a fastener. The fastener includes a portion configured to prevent separation of the electrode from the first side wall. The end of the second part faces the end of the part of the fastener and is separated in space from the end of the part of the fastener. With this design, the first part can reliably contact the shaft of the developing roller.

The fastener may be a screw, and said portion of the fastener may be a screw head. With this design, the electrode can be reliably and simply attached to the first side wall with a screw, which allows small movement of the screw.

The first side wall may be provided with a receiving part, made so that it is possible to surround this receiving part with a second part and the possibility of inserting a fastener into the receiving part. The end of the receiving part may be configured to protrude outward from the end of the second part to contact the end of the part of the fastener. With this design, the fastener can be positioned to provide a certain distance between the fastener and the second part. Therefore, it is possible to accurately and reliably ensure the distance between the end of the second part and the end of the fastener. As a result, the first part can be brought into reliable contact with the shaft of the developing roller, while ensuring smooth rotation of the shaft of the developing roller relative to the first part.

The first part and the contact part can extend from the first side wall in a direction opposite to the second side wall along the first center line. With this design, the feed element of the image forming apparatus can be brought into reliable contact with the contact portion. By guaranteeing a smooth rotation of the shaft of the developing roller relative to the part on which the shaft of the developing roller is supported, it is possible to introduce the part on which the shaft of the developing roller is supported in reliable contact with the shaft of the developing roller.

The development cartridge may further include a feed roller configured to supply a developing substance to the developing roller. The feed roller may be parallel to the developing roller. The feed roller may include a feed roller shaft configured to rotate during development, and a feed roller element configured to supply the developing substance to the developing roller. The feed roller element may be provided located around the shaft of the developing roller. The electrode may be provided with a part configured to surround the circumferential part of the feed roller shaft. With this design, it is also possible to supply power to the feed roller shaft.

In the development cartridge on the first side wall, a support separate from the electrode can be provided on which the shaft of the developing roller rests. With this design, it is also possible to supply power to the feed roller shaft. Therefore, the part on which the developing roller is supported can reliably contact the shaft of the developing roller. Even when the carrier is not used as an electrode, it is possible to reliably supply power to the shaft of the developing roller.

In the development cartridge, the electrode may include a second part attached to the first side wall by a screw. The first side wall may be provided with a screw receiving part, made so that it is possible to surround this screw receiving part with a second part and the screw can be inserted into the screw receiving part. The distance between the center of the screw receiving part and the axis of the shaft of the developing roller may differ from the distance between the center of the area surrounded by the second part in which it is possible to surround the screw receiving part and the center of the area surrounded by the first part in which the circumferential part of the shaft of the developing roller is surrounded. With this design of the side wall, reliable contact of the first part with the shaft of the developing roller is possible.

According to the invention, it is possible to prevent the electrode from leaving its position. Thus, it is possible to stably supply power to the shaft of the developing roller.

You can prevent the electrode from getting out of position. Thus, it is possible to stably supply power to the shaft of the developing roller.

With reliable support of the developing roller, it is possible to stably supply power to the developing roller element.

It is possible to efficiently assemble the developing roller with a nearby element or to effectively mount the roller to it. Since the developing roller is reliably supported, it is possible to stably supply power to the developing roller element.

It is possible to reliably supply power to the electrode.

The electrode can be made to give it any shape and you can reliably apply power to the element showing the roller.

It is possible to reliably supply power from the electrode to the developing roller element, and it is possible to reliably supply power from the electrode to the developing roller shaft.

The relative position of the electrode and the shaft of the developing roller can be selected without limitation. Thus, since the efficiency of the structure is increased, it is possible to reliably supply power from the electrode to the shaft of the developing roller.

The developing roller does not require support on other elements. Thus, it is possible to reduce the number of components used and their cost.

The first cylindrical part can reliably perceive the driving force from the leading connecting part. The second cylindrical part can reliably transmit the driving force to the shaft of the developing roller.

A reliable perception of the driving force from the leading connecting part is possible.

A reliable rotation of the developing roller can be ensured. In addition, the shaft of the developing roller may function as a guide during installation of the developing cartridge. Thus, it is possible to reduce the number of components used and their cost.

Reliable rotation of the feed roller can be ensured. In addition, it is possible to ensure effective rotation of the developing roller and the feed roller.

Power can also be supplied to the feed roller.

The developing roller shaft and the feed roller shaft can be reliably supported on the first part and the second part, respectively.

It is possible to reliably supply power to the electrode from the image forming apparatus.

The development cartridge can be replaced with a new one according to the residual amount of the developing substance, regardless of the life of the photoconductive element. The photoconductive cartridge can be replaced in accordance with the life of the photoconductive element, regardless of the residual amount of the developing substance contained in the cartridge development.

In the presence of reliable contact between the developing roller and the photoconductive element, it is possible to reliably exhibit an electrostatic latent image formed on the photoconductive element using the developing substance carried on the developing roller.

In accordance with the invention, reliable contact of the developing roller with the photoconductive element can be guaranteed.

You can further prevent the exit of the electrode from its position. Thus, it is possible to reliably supply power to the shaft of the developing roller.

It turns out that a reliable perception of the driving force from the leading connecting part is possible.

It is possible to reliably supply power to the shaft of the developing roller by means of the contact part and the first part.

The first part can reliably contact the shaft of the developing roller.

The electrode can be securely and simply attached to the first side wall with a screw.

The first part can be brought into reliable contact with the shaft of the developing roller, while guaranteeing a smooth rotation of the shaft of the developing roller relative to the first part.

The power element of the image forming apparatus can be brought into reliable contact with the contact portion. By ensuring smooth rotation of the shaft of the developing roller relative to the part on which the shaft of the developing roller rests, the first part can be brought into reliable contact with the shaft of the developing roller.

You can also supply power to the feed roller shaft.

The first part can reliably contact the shaft of the developing roller. Even when the support is not used as an electrode, it is possible to reliably supply power to the shaft of the developing roller.

It turns out that reliable contact of the first part with the shaft of the developing roller is possible.

Brief Description of the Drawings

Now, with reference to the accompanying drawings, illustrative aspects of the invention will be described in detail, where:

FIG. 1 is a cross-sectional side view of an overall configuration of a laser printer as an image forming apparatus in accordance with an illustrative aspect; FIG.

FIG. 2 is a cross-sectional side view of a process cartridge for use in the laser printer shown in FIG. 1, in accordance with an illustrative aspect;

FIG. 3 is a cross-sectional side view of a drum cartridge for use in the laser printer shown in FIG. 1, in accordance with an illustrative aspect;

FIG. 4 is a cross-sectional side view of a development cartridge for use in the laser printer of FIG. 1, in accordance with an illustrative aspect;

5 is a perspective image of the top, rear and left of the manifest cartridge;

6 is a perspective image from above, behind and to the right of the development cartridge;

Fig.7 is a perspective image of the bottom, front and left of the cartridge manifestations;

Fig is a perspective image of the bottom, front and right of the cartridge manifestations;

FIG. 9 is a rear plan view of a development cartridge; FIG.

10 is a front plan view of a development cartridge;

11 is a top plan view of a development cartridge;

12 is a plan view from below of a development cartridge;

13 is a left side view of a developing cartridge with a gear cover attached to the developing cartridge;

Fig. 14 is a left side view of the developing cartridge, wherein the gear cover is detached from the developing cartridge;

Fig is a right side view of the manifestation cartridge;

Fig is a perspective image of the top, rear and left of the drum cartridge;

Fig is a perspective image of the top, front and right of the process cartridge;

Figa and 18B is a perspective view, respectively illustrating a portion of the shaft showing the roller and a side view of the shaft showing the roller in accordance with an illustrative aspect;

FIG. 19 is a left side view of a development cartridge corresponding to FIG. 13 with a contact plate projected in the width direction of the development cartridge, in accordance with an illustrative aspect;

FIG. 20 is a right side view of a development cartridge corresponding to FIG. 15, with a portion of the driven connecting part projected in the width direction of the development cartridge, in accordance with an illustrative aspect;

FIG. 21 is a perspective view from above, behind, and to the left of the developing cartridge corresponding to FIG. 6, wherein the electrode element is detached from the developing cartridge in accordance with an illustrative aspect;

Fig.22 is a perspective image of the bottom, front and right of the development cartridge corresponding to Fig.8, while the electrode element is detached from the development cartridge;

FIG. 23 is a right side view of the development cartridge of FIG. 15;

24 is a cross-sectional view of a development cartridge drawn along line AA shown in FIG.

FIG. 25 is a cross-sectional view of a development cartridge drawn along line BB shown in FIG.

Description of the drawings

1: laser printer

2: main body

27: Cartridge with a drum

28: Drum

30: Cartridge manifestations

36: Development framework

37: feed roller

38: Developing roller

50: feed roller shaft

51: Sponge Roller

52: Shaft showing the platen

53: Rubber roller

69: side wall

79: Cylindrical screw part

93: gear cover

94: input gear

95: feed roller drive gear

102: Engaging parts

100: Guided binding part

101: Drive gear

115: developing gear drive wheel

117: electrode element

118: Part covering the shaft of the developing roller

119: End

120: mounting plate

122: contact plate

123: Base plate

127: Part covering the feed roller shaft

130: screw

130b: screw head

132: Boss

140: Screw hole

150: pressure lever

201: Carrier

X1: first centerline

X2: second centerline

L1: first line

L2: Second line

D1: First distance

D2: Second distance

If: Internal - with respect to the axial direction of the screws - end face of the screw head

Ff: Free end of the cylindrical part under the screw

Of: The outer edge of the base plate

The best embodiment of the invention

It should be noted that in the following description, various compounds are defined between elements. It should also be noted that these compounds, in the general case and unless otherwise indicated, can be direct or indirect and that this description is therefore not restrictive.

Now, with reference to the accompanying drawings will be described illustrative aspects. 1 is a cross-sectional side view of a general configuration of a laser printer in which a developing cartridge is installed, in accordance with an illustrative aspect. FIG. 2 is a cross-sectional side view of a process cartridge for use in the laser printer of FIG. 1 in accordance with an illustrative aspect. FIG. 3 is a cross-sectional side view of a drum cartridge for use in the laser printer of FIG. 1 in accordance with an illustrative aspect. FIG. 4 is a cross-sectional side view of a development cartridge for use in the laser printer of FIG. 1 in accordance with an illustrative aspect.

As shown in FIG. 1, the laser printer 1 includes a main body, a feeding unit 4, which feeds the sheet 3, and an image forming unit 5, which forms an image on the fed sheet 3. The feeding unit 4 and the image forming unit 5 are mainly located case.

(1) Main body

An opening 6 is made on the front side of the main body (on the left in FIG. 1), through which the process cartridge 20 is inserted into or removed from the main body. A front cover 7 is provided on the right side of the main body for opening and closing the opening 6. The front cover 7 is rotatably held onto the cover shaft 8, which is inserted into the lower end portion of the front cover 7. When the front cover 7 is rotated to close around the cover shaft 8, the opening 6 is closed by the front cover 7. When the front cover 7 is rotated to open around the shaft 8 of the cover, the opening 6 is opened. Thus, the process cartridge 20 can be inserted into the main body 2 or removed from there through the opening 6.

In the following description, the side on which the front cover 7 is provided when the process cartridge 20 is installed in the main body is called the front side of the laser printer 1 or the process cartridge 20 (including the development cartridge 30), and the side opposite to the front side is called the back side.

(2) Feeding unit

As shown in FIG. 1, the feeding unit 4 is provided in the lower part in the main body 2 and is provided with a sheet feeding tray 9 that is slidably mounted in the main body 2 along the front to back direction, separating the roller 10 and separating plate 11 provided at the upper front end parts of the tray 9 for sheet feeding, and a pickup roller 12 provided at the rear side of the separating roller 10 (at the inlet - in the sheet feeding direction - the sides of the separating plate 11). The feeding unit 4 further includes a paper dust removal roller 13 provided at the upper front part of the separating roller 10 (at the outlet, in the sheet feeding direction, the sides of the separating roller 10), and a pressure roller 14, so that it faces the roller 13 to remove paper dust.

The feed unit 4 includes a pair of alignment rollers located below the process cartridge 20, when it is installed in the sheet feed channel in front of the U-shaped portion of the channel, said channel making this U-shaped rotation near the roll 13 to remove paper dust in the direction to the back side. Inside the sheet feeding tray 9 there is a sheet stacking plate 16 arranged to stack a stack of sheets 3. A stacking plate 16 is rotatable between a stacking position in which the sheet stacking plate 16 is substantially parallel to the bottom plate of the tray 9 for sheet feeding, and the front end of the sheet laying plate 16 is in the lowered position, and the feeding position, in which the sheet laying plate 16 is at an angle and its front end is in the raised position.

A lever 17 is provided at the front end of the sheet feeding tray 9 for lifting the front end of the sheet stacking plate 16. The lever 17 is held on the lower side of the front end of the sheet-laying plate 16 rotatably around the lever shaft 18 located at the rear end of the lever 17. The lever 17 is rotatable between a parallel position in which the front end of the lever 17 is substantially parallel to the lower plate a sheet feeding tray 9, and an inclined position in which the front end of the lever 17 is angled to lift the sheet stacking plate 16. When a driving force is applied to the lever shaft 18, the lever 17 rotates around the lever shaft 18. Accordingly, the front end of the lever 17 raises the front end of the sheet laying plate 16 by moving the sheet laying plate 16 to the feeding position.

When the sheet-laying plate 16 is in the feeding position, the top sheet 3 on the sheet-feeding plate 16 is pressed against the pickup roller 12 and is fed into the separation position between the pick-up roller 10 and the pick-up plate 11 by rotating the pick-up roller 12.

When the sheet feeding tray 9 is removed from the main body 2, the sheet-laying plate 16 is in the stacking position. When the sheet-laying plate 16 is in the stacking position, a stack of sheets 3 can be stacked on the sheet-laying plate 16.

The sheets 3 fed into the separation position by the pickup roller 12 are separated one after another when they are enclosed between the separating roller 10 and the separating plate 11 by rotating the separating roller 10. The feeding sheet 3 passes through that section between the roller 13 to remove paper dust and pinch roller 14, where the removal of paper dust or fibers. Then, sheet 3 is fed through a U-shaped portion of the sheet feed channel toward alignment rollers 15.

The alignment rollers 15 align the sheet 3 or reduce the skew of the sheet 3. Then, the alignment rollers 15 feed the sheet 3 to the transfer position between the photoconductor 28 used as an element with the photoconductive layer and the image transfer roller 31, and in this position, the image shown by the toner on drum 28, transferred to sheet 3.

Imaging unit

The imaging unit 5 includes a scanning unit 19, a process cartridge 20, and a fixing unit 21.

(a) Scanning unit

The scanning unit 19 is located in the upper part in the main body 2. The scanning unit 19 includes a laser light source (not shown), a polygonal mirror 22, rotatable, an fθ lens 23, a reflection mirror 24, a lens 25 and a reflection mirror 26. As shown by dot-and-dash lines in FIG. 1, the laser beam emitted from the laser light source based on the image data is deflected by the polygonal mirror 22 and passes through the fθ lens 23. Then, the laser beam is reflected by the reflecting mirror 24 and directed through the lens 25 to the reflective erkalu 26, wherein the laser beam is deflected downwardly towards the surface of the drum 28 of the process cartridge 20. Thus, the surface of the photoconductor 28 is irradiated with the laser beam.

(b) Technological cartridge

The process cartridge is removably mounted in the main body 2 below the scanning unit 19 through the opening 6. As shown in FIG. 2, the process cartridge 20 includes a cartridge 27 with a drum as a photoconductive cartridge and a development cartridge 30 corresponding to at least one illustrative an aspect that is removably mounted in the drum cartridge 27.

(b-1) Drum Cartridge

As shown in FIG. 3, the drum cartridge 27 includes a drum cage 58 and a photoconductive layer drum 28, a speedron charger 29, an image transfer roller 31, and a cleaning member 32 that are located in the drum frame 58.

The frame 58 of the drum includes an upper frame 141, which serves as a support for the charging device 29 and the cleaning element 32, and a lower frame 142, which serves as a support for the drum 28 with a photoconductive layer and a roller 31 for transferring the image.

As shown in FIGS. 3 and 16, the lower frame 142 is provided with a lower wall 143, a left and right side walls 144L, 144R, a front wall 145 and a rear wall 146, which are integrally formed so that the frame under consideration opens upward. The bottom wall 143 is in the form of a substantially rectangular plate. The left and right side walls 144L, 144R are located so that they are facing each other at the left and right ends of the lower wall 143. The front wall 145 is located at the front end of the lower wall 143. The rear wall 146 is located at the rear end of the lower wall 143.

The front part of the lower frame is formed as part 147 for installing a development cartridge. The back of the lower frame 142 is formed as a part 148 serving as a support for the drum, in which the lower frame 142 and the upper frame 141 are facing each other in the vertical direction and the drum 28 is held.

As shown in FIG. 3, the photoconductive layer drum 28 includes a cylindrical drum body 33 having a positively charged photoconductive layer on its upper surface made of, for example, polycarbonate, and a metal drum shaft 34 located along the axis of the drum body 33 along the axial direction of the body 33 of the drum. The drum shaft 34 rests on the left side wall 144L and the right side wall 144R of the lower frame 142. The drum body 33 is rotatably supported on the drum shaft 34. The drum 28 is rotated on the drum shaft 34 by applying a driving force from an electric motor (not shown) during image formation.

The scorotron charger 29 rests on the upper frame 141 at the upper rear of the photosensitive drum 28. The scorotron charger 29 is positioned so that it faces the drum 28 and there is a predetermined distance between them to prevent the speedron charger 29 from contacting the drum 28. Charger 29 includes a conductor 67 located so that it faces the photoconductive drum 28 with a predetermined distance between them, and a grid 68 located between the conductor 67 for control the magnitude of the electric charge passing from the conductor 67 to the drum 28. During the imaging, a bias voltage is applied to the grid 68. In this case, a high voltage is applied to the conductor 67 to create a corona discharge from the conductor 67. Thus, the charger 29 uniformly charges the surface of the drum 28 with a positive charge.

The image transfer roller 31 is located in the lower frame 142 under the drum 28. The image transfer roller 31 is in vertical contact with the image drum 28 to form a gap between the image transfer roller 31 and the image drum 28. The image transfer roller 31 includes a metal shaft 56 of the image transfer roller coated with a rubber roller 57 made of electrically conductive rubber. The shaft 56 of the image transfer roller is rotationally supported on the left and right side walls 144L, 144R of the lower frame 142. During the transfer of the toner onto the sheet 3 (during image formation), a driving force is supplied from the electric motor (not shown) to rotate the roller 31 for image transfer. During the transfer of the toner onto the sheet 3, a bias voltage is applied to the image transfer roller 31.

The cleaning element 32 rests on the upper frame 141 behind the drum 28 so that it faces the drum 28. The cleaning element 32 includes a cleaning brush 65 for collecting paper dust or fibers on the drum 28 and a support plate 66 that supports the brush 65 and - with respect to the cleaning brush 65 - is located on the opposite side of the drum 28 (behind the drum 28).

The cleaning brush 65 includes a non-woven fabric with numerous electrically conductive fiber-like bristles attached to it. The cleaning brush 65 is attached to the base plate 66 with double-sided adhesive tape. The cleaning brush 65 is in contact with the drum 28. The support plate 66 is supported by the upper frame 141 and serves as a supporting cleaning brush 65.

The direction parallel to the shaft 34 of the drum, available in the drum 28, can be called the "first direction". The direction perpendicular to the first direction and going to the front side of the main body 2 can be called the "second direction". In part 147 for installing the development cartridge, essentially in the central part of the front wall 145 in the first direction, a handle 149 is formed which is held during installation or removal of the drum cartridge 27.

At each end, with respect to the first direction, of the front wall 145, there is a clamping lever 150 that presses the developing cartridge 30 mounted in the developing cartridge part 147, firmly pressing the developing roller 38 against the drum 28. Each clamping lever 150 is made of a thick plate and has a substantially triangular shape when viewed from the side. The lower end of each pressure arm 150 is rotatably supported by a fixed shaft (not shown) extending inward in a first direction from each side wall 144L, 144R.

Between each pressure arm 150 and the front wall 145, a compression spring (not shown) is disposed. Therefore, each clamping arm 150 is always pressed or tilted backward by the driving force of the compression spring.

A locking lever 151 is provided on one side wall (right side wall 144R), while there is a certain distance between the locking lever 151 and one of the pressing levers 150 in the front to back direction. The locking lever 151 has a substantially rectangular shape when viewed from the side. The locking lever 151 is provided with a flexible portion 152 extending downward from the locking lever 151. The locking lever 151 is rotatably supported on the right side wall 144R by this flexible portion 152 engaged with a rib (not shown) formed on the lower wall 143.

In the portion 147 for installing the developing cartridge at the rear ends of the left and right side walls 144L, 114R, guide grooves 153 are arranged along which the sleeve member 116 and the part 118 covering the developing roller shaft will be guided, which will be described later, for mounting the developing cartridge 30 in the part 147, in which a developing cartridge is installed. As shown in FIGS. 2 and 3, in part 147 for installing the developing cartridge, slightly in front of the central part of the bottom wall 143 in the second direction, mounting bases 155 are made on which mounting parts 133 of the developing cartridge 30 are placed.

(b-2) Cartridge manifestations

As shown in FIGS. 16 and 17, the developing cartridge 30 is removably mounted in the mounting portion 147 for installing the developing frame of the lower frame 142 when the process cartridge 20 is separated from or removed from the main body. As shown in FIG. 4, the developing cartridge includes a developing frame 36 and a feeding roller 37, showing a roller 38 and a layer thickness adjusting knife 39, which are located in the developing frame 36.

The developing frame 36 has a box shape open in the backward direction. In the developing frame 36, there is a partition plate 40, as well as a toner chamber 41 and a developing chamber 42, which are separated by a partition plate 40. The partition plate 40 is located in the middle of the developing frame 36 in a second direction, dividing the developing frame 36 in the front to back direction. In the middle part of the partition plate 40, a channel 43 is formed in a vertical direction.

The toner chamber 41 is bounded in the interior of the developing frame 36 on its front side by a partition wall 40. The toner chamber 41 contains a positively charged non-magnetic one-component toner as a developing substance. This toner is, for example, a polymerized toner, which is obtained by copolymerizing a polymerizable monomer using a polymerization method, such as a suspension polymerization method. The polymerizable monomers can be styrene-based monomers such as styrene and acrylic-based monomers such as acrylic acid, alkyl (C ₁ -C ₄ ) acrylate or alkyl (C ₁ -C ₄ ) methacrylate. A particle of such a polymerized toner has a substantially spherical shape, whereby the polymerized toner has excellent flowability and provides high-quality image formation.

The toner is mixed with wax and a coloring agent, such as carbon black, as well as with an external additive, such as silica, to increase the fluidity of the toner. The average particle size of the toner is approximately 6 to 10 microns.

In the left and right side walls 69L, 69R (described below) of the developing frame 36 in the toner chamber 41, a toner refill hole is provided through which toner is supplied to the toner chamber 41. The toner refill port is closed by the toner cap 35, as shown in FIG.

A window 44 for detecting toner is provided on each of the left and right side walls 69L, 69R of the developing frame 26 in the toner chamber 41. Windows 44 for detecting toner are formed on the left and right side walls 69L, 69R of the developing frame 36 near the partition plate 40 so that they face each other along the width direction of the developing cartridge 30 (which is perpendicular to the front to back direction). Each toner detection window 44 is formed by incorporating a transparent disk plate into an opening formed by the left and right side walls 69L, 69R of the developing frame 36, as shown in FIGS. 13, 14 and 15.

An agitator 45 is provided in the toner chamber 41, which mixes the toner in the toner chamber 41. The agitator 45 is provided with an agitator rotation shaft 46 and a stirring member 47. The agitator rotation shaft 46 is rotationally supported on the left and right side walls 69L, 69R of the developing frame 36, essentially in the central part of the toner chamber 41. A mixing element 47 is provided on the shaft 46 of rotation of the mixer. The driving force is supplied from an electric motor (not shown) to the shaft 46 of rotation of the mixer and provides rotation of the mixer 45 during development (during image formation).

The stirrer 45 is provided with wiping elements 48. Each wiping element 48 is provided at each end of the shaft 46 of rotation of the stirrer with respect to its axial direction. When the agitator rotation shaft 46 rotates, each wiper member 48 rotates around the agitator rotation shaft 46 in a circumferential direction in the toner chamber 41, wiping the toner detection windows 44 provided on the left and right side walls 69L, 69R of the developing frame 36. Thus, the windows 44 to detect toner wiped wiping elements 48.

The developing chamber 42 is bounded in the interior of the developing frame 36 on its rear side by a partition wall 40. The feed roller 37 is located behind the channel 43 above the central bottom wall 75 (described below). The feed roll 37 includes a metal roll 50 of the feed roll coated with a sponge roll 51 as a feed roll member made of electrically conductive foam. The feed roller shaft 50 is rotationally supported on the left and right side walls 69L, 69R of the developing frame 36 in the developing chamber 42. Each end of the feeding roller shaft 50 projects outward from the left and right side walls 69L, 69R. During development (during image formation), a driving force is applied to the feed roller shaft 50 from the motor (not shown) to rotate the feed roller 37. During development (during image formation), the same bias voltage is applied to the feed roller 37 as the voltage a developing bias applied to the developing roller 38.

The developing roller 38 is located in the developing chamber 42 behind the feeding roller 36 and above the rear bottom wall 76 (described below), as shown in FIG. The developing roller 38 is in contact with the feeding roller 37, as a result of which they exert some pressure on each other. The developing roller 38 includes a metal shaft 52 of the developing roller coated with a rubber roller 53 as an element of the developing roller made of conductive rubber. The shaft 52 of the developing roller extends parallel to the shaft 50 of the feed roller. The developing roller shaft 52 is rotatably supported on the left and right side walls 69L, 69R (described below) of the developing frame 36 in the developing chamber 42.

Each end of the shaft 52 of the developing roller protrudes outward from the left and right side walls 69L, 69R (described below). The rubber roller 53 is made of electrically conductive urethane or silicone rubber, including small particles of carbon. The surface of the rubber roller 53 is coated with urethane rubber or silicone rubber including fluorine. During development (during image formation), a driving force is supplied from the motor (not shown) to the shaft 52 of the developing roller to rotate the developing roller 38. During development (during image formation), the same developing bias voltage is applied to the developing roller 38.

The knife thickness control layer 39, which has a semicircle shape in cross section, includes a knife body 54 formed by a metal flat spring element, and a pressing portion 55, which has a semicircle shape in cross section and is made of insulating silicone rubber. A pressing portion 55 is provided at the free end of the knife body 54. The end of the base, opposite the free end of the knife body 54, which is present in the thickness control layer of the knife 39, is held over the developing roller in the knife fastening part 77 (described below) by means of the fastener 134. The free end of the knife body 54 extends at an acute angle down and forward along towards the feed roller 37. The pressing portion 55 is pressed against the developing roller 28 under the influence of the elastic force of the knife body 54.

(b-3) Operations of manifestation and transfer

During imaging from an electric motor (not shown), a driving force is supplied to the agitator rotation shaft 46, the agitator rotation shaft 46 rotates, and therefore, the stirring member 47 rotates around the agitator rotation shaft 46 in the circumferential direction in the toner chamber 41. Accordingly, the toner in the toner chamber 41 is mixed by the stirring member 47 and discharged into the developing chamber 42 through a channel 43 formed in the middle of the partition plate 40 in the vertical direction, so that communication is provided by the fluid in the front to back direction.

The toner discharged through the channel 43 to the developing chamber 42 is supplied to the rubber roller 53 of the developing roller 38 by the sponge roller 51 of the feeding roller 37 in accordance with the rotation of the shaft 50 of the feeding roller. At this moment, the toner acquires a positive charge due to friction between the sponge roller 51 of the feed roller 37 and the rubber roller 53 of the developing roller 38. The toner supplied to the rubber roller 53 of the developing roller 38 passes between the pressing portion 55 of the thickness control layer of the knife 39 and the rubber roller 53 the developing roller 38 in accordance with the rotation of the shaft 52 of the developing roller. The rubber roller 53 of the developing roller 38 carries the toner in the form of a thin layer, the thickness of which is adjusted.

As shown in FIG. 2, when the drum 28 rotates, the speedron charger 29 uniformly charges the surface of the drum body 33 with a positive charge. Then, the laser beam from the scanning unit 19 scans across the surface of the drum body 33 at a high speed, thereby forming on the surface of the drum body 33 an electrostatic latent image corresponding to the image to be formed on the sheet 3.

Then, when the toner carried by the rubber roller 53 of the developing roller 38 and positively charged comes into contact with the drum body 33 of the drum 28, in accordance with the rotation of the shaft 52 of the developing roller, the toner is supplied to an electrostatic latent image formed on the surface of the drum body 33 that is, on parts exposed by a laser beam, where the potential level is lower than on the rest of the surface of the drum body 33, uniformly and positively charged. Thus, the electrostatic latent image on the surface 33 of the drum becomes visible. Therefore, on the surface of the drum body 33, due to the reverse manifestation, an image developed by the toner is formed.

Then, the image developed by the toner on the surface of the drum body 33 is transferred to the sheet 3 by applying a transfer bias to the rubber roller 57 of the image transfer roller 31 when the sheet 3 transported by the alignment rollers 15 passes through the transfer position between the drum body 33 and the rubber roller 57 roller 31 for transferring the image. The sheet 3 having the transferred onto it image developed by the toner is supplied to the fixing unit 21.

The toner remaining on the surface of the drum body 33 after transferring the image shown by the toner is collected by the rubber roller 53 of the developing roller 38. Paper dust and fibers adhering to the surface of the drum body 33 after transferring the image shown by the toner due to contact with the sheet 3 are removed a cleaning brush 65 of the cleaning element 32 from the surface of the drum body 33 of the drum unit 28.

(c) Locking unit

As shown in FIG. 1, a fixing unit 21 is provided behind the process cartridge 20, while a certain distance is maintained substantially in the horizontal direction between the drum 28 of the process cartridge 20 and the fixing unit 21. The locking block 21 includes a block frame 59, as well as a heating roller 60 and a pinch roller 61, which are located in the block frame 59.

The heating roller 60 includes a metal tube, the surface of which is coated with a fluorocarbon resin, and a halogen lamp inserted into the metal tube to apply heat. The heating roller 60 rotates by applying power from an electric motor (not shown) during fixation (during imaging).

The pressure roller 61 is located below the heating roller 60 opposite the heating roller 60 and, thus, is pressed against the heating roller 60. The pressure roller 61 includes a metal shaft of the roller coated with a rubber roller made of rubber. The pressure roller 61 is driven by rotation of the heating roller 60.

In the fixing unit 21, the image shown by the toner transferred to the sheet 3 in the transfer position extends between the heating roller 60 and the pressure roller 61. The sheet 3 having the image fixed thereon, developed by the toner, is transported to the sheet delivery tray 62 made on the top surface of the main body. The sheet delivery channel from the fixing unit 21 to the sheet issuing tray 62 is substantially U-shaped, turning towards the front side of the fixing unit 21. A feed roller 63 is located in the sheet delivery channel. At the outlet ends of the sheet issuing channel output rollers 64 are located.

The sheet 3 subjected to the thermal fixing process is transported to the sheet delivery channel. The sheet 3 is fed to the output rollers 65 by the feed roller 63. Then, the sheet 3 is delivered to the tray 62 for outputting sheets by the output rollers 64.

2. Cartridge manifestations

Figure 5 presents a perspective image of the top, rear and left of the development cartridge. Figure 6 presents a perspective image from above, behind and to the right of the development cartridge. Figure 7 presents a perspective image of the bottom, front and left of the development cartridge. On Fig presents a perspective image of the bottom, front and right of the development cartridge. FIG. 9 is a rear plan view of a development cartridge. 10 is a front plan view of a development cartridge. 11 is a top plan view of a development cartridge. 12 is a plan view from below of a development cartridge. 13 is a left side view of a development cartridge with a gear cover attached to the development cartridge. On Fig presents a left view of the cartridge manifestations, while the cover of the gears is detached from the cartridge manifestations. On Fig presents a right view of the cartridge manifestations. FIG. 19 is a left side view of the developing cartridge corresponding to FIG. 13 with a contact plate projected in the width direction of the developing cartridge. FIG. 20 is a right side view of the development cartridge corresponding to FIG. 15, with a portion of the driven connecting part projected in the width direction by a contact plate projecting in the width direction of the development cartridge.

Now, with reference to FIGS. 4-15 and FIGS. 19 and 20, a development cartridge 30 will be described in detail.

(1) Development frame

As shown in FIGS. 4 and 5, the developing frame 36 includes a pair of left and right side walls 69L, 69R, an upper wall 70, a lower wall 71, and a front wall 72, which are integrally formed. The developing frame 36 has a box shape with a rear open portion 73 formed therein.

The left and right side walls 69L, 69R are in the form of a flat plate. As shown in FIG. 11, the left and right side walls 69L, 69R are opposed to each other in a first direction, and a toner chamber 41 and a developing chamber 42 are enclosed between the left and right side walls 69L, 69R. As shown in FIGS. 14 and 15 , the left and right side walls 69L, 69R cover each end of the toner chamber 41 and the developing chamber 42. As shown in FIGS. 4 and 11, the upper wall 70 is in the form of a flat plate. The upper wall 70 is connected to the upper ends of the left and right side walls 69L, 69R, passing between the left and right side walls 69L, 69R. The upper wall 70 covers the upper part of the toner chamber 41 and the developing chamber 42.

As shown in FIGS. 4 and 7, the bottom wall 71 has the shape of a curved plate. The bottom wall 71 is connected to the lower ends of the left and right side walls 69L, 69R, passing between the left and right side walls 69L, 69R. The lower wall 71 covers the lower part of the toner chamber 41 and the developing chamber 42. The lower wall 71 includes a front lower wall 74, a middle lower wall 75 and a rear lower wall 76, which are integrally formed.

The front bottom wall 74 is made having a cross section essentially in the form of a semicircle, which is associated with the path of rotation of the mixer 45 in the toner chamber 41.

The middle bottom wall 75 is located behind the front bottom wall 74. The middle bottom wall 75 is made having a cross section essentially in the form of a semicircle, which is associated with the feed roller 37 in the developing chamber 42.

The rear bottom wall 76 is located behind the middle bottom wall 75. The rear bottom wall 76 is inclined downward from the front side to the rear side.

The front wall 72 is in the form of a flat plate. The front wall 72 is connected to the front ends of the left and right side walls 69L, 69R, passing between the left and right side walls 69L, 69R. The front wall 72 covers the front of the toner chamber 41.

As shown in FIG. 4, a fastening knife part 77 is provided in the upper rear part of the left and right side walls 69L, 69R between the left and right side walls 69L, 69R. The fastening knife part 77 is substantially triangular in cross section when viewed side, so that the width of the knife-fastening portion 77 narrows toward the lower side. The rear end of the knife fastening part 77 is made in the form of an inclined surface that is inclined at an acute angle towards the front side from the upper end to the lower end of the knife fastening part 77.

As shown in FIGS. 4 and 9, the end of the base of the knife body 54 is attached to the rear end of the knife-fastening part 77 by means of a fastener 134, while a sealing element 135 is located between the rear end of the knife-fastening part 77 and the end of the base of the knife body 54. Sealing element 135 is provided at the rear end of the knife-fastening part 77 to prevent leakage from the part located between the rear end of the knife-fastening part 77 and the fastener 134.

The fastener 134 includes a front support element 138 having a plate-like shape, a rear support element 136 having a substantially L-shaped cross section, and screws 137. The front fastener 138 is located on the rear side of the sealing element 135. The end of the base body 54 of the knife is located on the rear side of the front support element 138. The rear support element 136 is located on the rear side of the end of the base of the body 54 of the knife. Screws 137 pass through the rear support member 136, the end of the base of the knife body 54 and the front support 138 in the front to back direction, fastening together the rear support member 136, the end of the base of the knife body 54 and the front support 138. Tighten the screws 137, the end of the base of the body 54 the knife is attached to the knife fastening part 77, whereby the end of the base of the knife body 54 and the fastener 134 provide the conclusion of the sealing element 135 between the end of the base of the knife body 54 and the knife fastening part 77.

As shown in FIGS. 4 and 5, the rear open portion 73 is bounded by the rear support member 136 of the fastener 134, the rear ends of the left and right side walls 69L, 69R, and the rear end of the rear bottom wall 76. The rear open portion 73 is substantially rectangular in shape first direction. A part of the developing roller 38 is open from the side of the rear open part 73. More specifically, as shown in FIG. 13, a part of the developing roller 38 protrudes, when viewed from the side, from the inside of the developing frame 36 outward through the rear open part 73.

As shown in FIG. 9, the developing roller 38 is configured such that each end of the shaft 52 of the developing roller is rotationally supported in opposite side walls 69L, 69R. A sleeve member 116 is installed at an end of the developing roller shaft 52 protruding from the left side wall 69L. As shown in FIGS. 5 and 7, an end of the developing roller shaft 52 is inserted with the sleeve element 116 into the portion 111 for inserting the developing roller shaft of the gear cover 93 wheels (described below), located on the side of the left side wall 69L. The end of the shaft 52 of the developing roller is rotatably supported in a portion 111 for inserting the shaft of the developing roller of the gear cover 93.

As shown in FIGS. 6 and 8 and described in detail below, on the other end of the shaft 52 of the developing roller protruding from the right side wall 69R, a support member 201 is provided provided to the side of the right side wall 69R. The other end of the developing roller shaft 52 passes through the supporting member 201. An electrode element 117 is located on the side of the supporting member 201. The developing roller covering part 118 that is formed in the electrode element 117 is seated on the other end of the developing roller shaft 52 passing through the supporting element 201. The shaft 52 of the developing roller is rotatably supported in the portion 118 that covers the shaft of the developing roller of the electrode element 117. Thus, both ends of the developing roller 38 are supported on the portion 111 for inserting the shaft of the hole -governing cushion cover 93 of gear wheels, as well as a portion 118 that covers the developer roller shaft, the electrode member 117.

When the developing cartridge 30 is installed in the developing cartridge mounting portion 147, the sleeve member 116 and the developing roller closing portion 118 are guided along the guide grooves 153, as shown in FIG. 17, formed in the side walls 144L, 144R of the developing cartridge mounted portion 147 . Thus, it is possible to guarantee a smooth insertion of the development cartridge 30 into the developing cartridge part 147.

As shown in FIGS. 5 and 9, the rear side walls 78 are located below the rear open portion 73 at the rear end of the rear bottom wall 76 at its right and left — relative to the width of the cartridge manifestations 30 — sides. Each rear side wall 79 has essentially L- shaped, while its inner lower part is notched. Between the rear side walls 78 at the rear end of the rear side wall 76 is a reinforcing part 80, which is located below the rear open part 73.

The reinforcing portion 80 extends along the width direction of the developing cartridge between the rear side walls 78. The reinforcing portion 80 is seated in the recessed portions of the rear side walls 78. As shown in FIGS. 4 and 5, the reinforcing portion 80 is continuous from the rear end of the rear bottom wall 76. The reinforcing part 80 includes a reinforcing upper wall 82, reinforcing the front wall 85, reinforcing the lower wall 83 and reinforcing the side walls 84. These walls 82-85 are integrally formed to form a box shape that is open in the direction backwards. More specifically, in a section drawn in a direction perpendicular to the width direction of the developing cartridge 30, the reinforcing portion 80 is given a substantially U-shaped shape open at the rear.

The reinforcing upper wall 82 is integrally formed with the rear end of the rear lower wall 76, extending in a rearward direction. The reinforcing front wall 85 is integral with the rear end of the rear lower wall 76, extending downward from the front end of the reinforcing upper wall 82. The reinforcing lower wall 83 is positioned so that it faces the reinforcing upper wall 82 in the vertical direction. The reinforcing lower wall 83 is integrally formed with the lower end of the reinforcing front wall 85, extending in a backward and downward direction.

The reinforcing side walls 84 are integral with the ends of the reinforcing upper wall 82, reinforcing the front wall 85 and reinforcing the lower wall 83 with respect to the width direction of the developing cartridge 30. As shown in FIG. 4, a lower film 87 is attached to the reinforcing upper wall 82. The lower film 87 is made, for example, of polyethylene terephthalate. The rear end of the lower film 87 is attached to the upper surface of the reinforcing upper wall 82, passing forward and upward and reaching contact with the lower surface of the rubber roller 53 of the developing roller 38. Accordingly, the lower film 87 covers the gap between the reinforcing upper wall 82 and the developing roller 38, preventing toner leakage out of this gap.

As shown in FIGS. 4 and 7, on the lower wall 71 of the developing frame 36, guide plates 81 are provided continuously extending from the reinforcing part 80. The guide plates 81 are in the form of ribs or flat plates, extending in the front to back direction as well as down from the bottom wall 71. Adjacent guide plates 81 are provided parallel to each other to provide some distance between them in the width direction of the developing cartridge 30.

More specifically, the rear end of each guide plate 81 is connected to a reinforcing front wall 85 and a reinforcing lower wall 83. The front end of each guide plate 81 is connected to a rear end portion of the front bottom wall 74. Each guide plate 81 extends downward from the rear bottom wall 76, central the lower wall 75 and the front lower wall 74. Each guide plate 81 is integrally formed with a reinforcing lower wall 83, a reinforcing front wall 85, a rear lower wall 76, a central lower wall 75 and the front bottom wall 74. The lower end of each guide plate 81 extends substantially straight toward the front side from the rear end of the reinforcing bottom wall 83 and is bent upwardly and forwardly at the central bottom wall 75, reaching the rear end of the front lower wall 74.

As shown in FIGS. 7 and 12, a guide reinforcing plate 86 is provided on the central bottom wall 75 for reinforcing each guide plate 81. The guide reinforcing plate 86 is flat in shape, extending downward from the central lower wall 75 at a certain average relative to the front direction back of said wall - part of the guide plates 81 and along the direction essentially perpendicular to this direction, from front to back. A guide reinforcing plate 86 connects the guide plates 81 in the width direction of the developing cartridge 30 to reinforce each guide plate 81.

The front bottom plate 74 is provided with mounting parts 133 and mounting plates 88 for installing a developing cartridge 30 in part 147 for installing a developing cartridge of a drum frame 58. Each mounting part 133 is located in the middle — with respect to the front to back direction — part of the front bottom wall 74, at each end thereof with respect to the width direction of the developing cartridge 30. Each mounting part 133 is formed at the bottom of the front bottom wall 74, having a substantially rectangular shape plates when viewed from below.

At the front ends of the front bottom wall 74, a pair of mounting plates 88 are formed that face each other in the width direction of the developing cartridge 30 and are located at each end of said wall with respect to the width direction of the developing cartridge 30. Each mounting plate 88 is made in a substantially triangular shape extending downward from the front bottom wall 74. The lower end of each mounting plate 88 extends from front to back slightly above each mounting portion 133.

As shown in FIGS. 7 and 10, the front wall 72 of the developing frame 36 is provided with a gripping portion 89. The gripping portion 89 is configured to have a substantially U-shape in plan view. The gripping portion 89 will include two handle support plates 90 located on the front wall 72, between which there is a certain distance in the width direction of the developing cartridge 30, and a handle 91 located between the handle support plates 90. Each handle support plate 90 is flat in shape, extending forward from the upper portion of the front wall 72. The handle 91 is connected to the front ends of the handle support plates 90.

On each of the left and right side walls 69L, 69R of the developing frame 36, a boss 132 is provided as a portion to be pressed. When the developing cartridge 30 is installed in the developing cartridge developing cartridge portion 147 of the drum frame 58, the bosses 132 are in contact with the respective pressure arms 150. Each boss 132 is provided in the front lower part of each of the left and right side walls 69L, 69R, protruding outward from the outer surface of the side walls 69L, 69R. As shown in FIGS. 14 and 15, each boss 132 is made to have a substantially U-shape when viewed from the side, open in the backward direction. Each boss 132 is located on the left and right side walls 69L, 69R in positions symmetrical with respect to the first direction.

When the developing cartridge 30 is installed in the developing cartridge portion 147 of the drum frame 58 developing cartridge, the mounting parts 133 are located on the respective mounting bases 155, as shown in FIG. 2, and the mounting plates 88 are placed on the bottom wall 143 of the developing cartridge mounting part 147.

As shown in FIGS. 8, 16 and 17, the front end of each boss 132 is in contact with a corresponding clamping arm 150. Due to the driving force of the compression spring that acts on each clamping arm 150, the corresponding clamping arm 150 exerts pressure on each boss 132 in the direction back. Accordingly, the developing frame 36 moves backward relative to the developing cartridge part 147, whereby the rubber roller 53 of the developing roller 38 is pressed against the drum 28.

As shown in FIGS. 6 and 8, the engaging portion 181 is integral with the right side wall 69R behind the boss 132 and protrudes outward. When the developing cartridge 30 is installed in the developing cartridge portion 147 present in the drum cartridge 27, the engaging portion 181 is located below the locking lever 151. The locking lever 151 is engaged with the engaging portion 181 by the driving force of the flexible portion 152. When the cartridge 30 the manifestations are removed from the developing cartridge part 147, the locking lever 151 is pushed down to disengage the engaged part 181 from the locking lever 151.

(2) Gear mechanism and gear cover

As shown in FIG. 14, the ends of the agitator rotation shaft 46, the feed roller shaft 50 and the developing roller shaft 52 extend outwardly in the first direction from the left side wall 69L as the second side wall. On the left side wall 69L there are gears 92 for driving the rotation of the agitator shaft 46, the feed roller shaft 50 and the developing roller shaft 52 and the gear cover 93, which closes the gear mechanism 92, as shown in FIGS. 5 and 13.

As shown in FIG. 14, the gear mechanism 92 is located on the left side wall 69L. The gear mechanism 92 includes an input gear 94 as a driven coupling part, a drive gear 95 of the feed roller as a gear of the feed roller, a drive gear 115 of the developing roller, an intermediate gear 96, a drive gear of the agitator 97 and a detection gear wheel 98.

The input gear 94 is rotatably supported between the shaft 52 of the developing roller and the shaft 46 of rotation of the mixer on the support shaft 99 of the input gear, which protrudes outward from the left side wall 69L in the first direction.

The input gear wheel 94 is provided with the connecting part 100 as a whole and the driving wheel 101 as the second cylindrical part, which is concentric with the driven connecting part 100 around the driven connecting part 100. The driven connecting part 100 is hollow cylinder. The limiting engagement portions 102 as driven members that are engaged with the leading coupling part 200 (shown in FIG. 5) as the leading connecting part extend radially inward from the inner peripheral surface of the driven connecting part 100. The engaging bound portion 102 is opposed relative to the support shaft 99 of the input gear. Thus, the driven connecting part 100 is made in the form of a ring gear, which is engaged with the leading connecting part 200 (in FIG. 5).

The drive gear 101 is positioned adjacent to the driven connecting part 100 in a first direction between the driven connecting part 100 and the left side wall 69L.

The drive gear wheel 95 of the feed roller is mounted on the end of the shaft 50 of the feed roller gearing with the input gear 94 below the input gear 94. The drive gear 95 of the feed roller is provided to rotate together with the feed roll shaft 50, so that the drive gear 95 of the feed roller does not rotate relative to the feed roll shaft 50.

The developing roller drive gear 115 is mounted on an end of the developing roller shaft 52 to the input gear 94 on the lower rear side of the input gear 94. The developing roller drive gear 115 rotates together with the developing roller shaft 52, so that the developing roller drive gear 115 does not rotate relative to the shaft 52 of the developing roller.

The intermediate gear 96 is rotatably mounted in front of the input gear 94 on the support shaft 103 of the intermediate gear protruding outward in the first direction from the left side wall 69L. The intermediate gear is provided with the external gear 104, which is engaged with the input gear 94, and the internal gear 105, which is engaged with the drive gear 97 of the agitator. The inner gear 105 is located on the inner side of the outer gear 104 with respect to the width direction of the developing cartridge 30.

The agitator drive gear 97 is mounted at the end of the agitator rotation shaft 46 for rotation together with the agitator rotation shaft 46, so that the agitator drive gear 97 does not rotate relative to the agitator rotation shaft 46. The drive gear 97 of the agitator is located on the lower front side of the intermediate gear wheel 96. The drive gear 97 of the agitator is provided with the internal gear wheel 106, which is engaged with the internal gear wheel 105 of the intermediate gear wheel 96, and the external gear wheel 107, which is engaged with the detecting gear 98. The outer gear 107 is located on the outside of the inner gear 106 in the direction of the width of the cartridge eniya 30.

The detecting gear 98 is rotationally supported on the support shaft 108 of the detecting gear, which protrudes in the first direction outward from the left side wall 69L on the upper front side of the agitator drive gear 97. The detecting gear 98 is a gear ring with a partial absence of teeth. The detecting gear wheel 98 is integrally formed with a protrusion 109 defining a use that extends radially outward from the support shaft 108 of the detecting gear. The detecting gear 98 is influenced by a coil spring 110 wound around the detecting gear support shaft 108 to engage the outer gear 107 of the agitator drive gear 97.

As shown in FIG. 13, the gear cover 93 is attached to the left side wall 69L of the developing cartridge 30, closing the gear mechanism of the gears 92 from the outside with respect to the width direction of the developing cartridge 30. The gear cover 93 has an opening 111 for inserting the developing roller shaft into which is inserted the shaft 52 showing the roller and the sleeve element 116, and the inlet 112, which opens passing through the driven connecting part 100. In addition, the cover 93 of the gears is provided with a part 113 that covers the detecting tooth a live wheel that closes the detecting gear 98 on the front side of the inlet 112.

The part 113 covering the detecting gear protrudes outward in a first direction. The detecting gear 98 is seated in an expanded portion of the portion 113 covering the detecting gear. On the rear side of the detecting gear portion 113 closing, a sector-shaped detection window 114 is formed in a sector. A projection 109 defining a use that moves in the radial direction of the detecting gear 98 in accordance with the rotation of the detecting gear 98 is opened from the detection window 114.

When the process cartridge 20, having the developing cartridge 30 enclosed therein, is installed in the main body 2, the driving connecting part 200 is inserted into the driven connecting part 100 of the input gear wheel 94 of the developing cartridge 30, as shown in FIG. 5, to which a driving force is transmitted from an electric motor (not shown) provided in the main body 2. Thus, the driven coupling part 100 is engaged with the driving coupling part 200.

The leading connecting part 200 is removably inserted into the driven connecting part 100 in connection with the opening and closing operations of the front cover 7 of the main body 2. More specifically, when the front cover 7 is opened, the leading connecting part 200 leaves the driven connecting part 100, so that the process cartridge 20 can be removed from the main body 2. When the process cartridge 20, having a developing cartridge 30 enclosed therein, is installed in the main body 2, a leading connecting part 200 is inserted into the main cartridge 2 through the opening 6 and then close the front cover 7, the leading connecting part moves towards the driven connecting part 100 and is inserted into it.

When the driving force from the electric motor is supplied from the driving coupling part 200 to the driven coupling part 100, the input gear rotates. Then, the drive gear wheel 95 of the feed roller is rotated, which is engaged directly with the drive gear 101 of the input gear 94. Accordingly, the feed roll shaft 50 causes the feed roller 37 to rotate. The drive gear 115 of the developing roller, which is engaged directly with the driving gear 101 of the input gear 94. Accordingly, the shaft 52 of the developing roller causes the feed roller 37 to rotate.

In addition, the outer gear 104 of the intermediate gear 96 is rotated, which is engaged with the driving gear 101 of the input gear 94. The inner gear 105 of the intermediate gear 96 also rotates, which is integral with the outer gear 104. When the inner gear 105 of the intermediate gear 96 rotates, and the inner gear 106 of the driving gear 97 of the agitator, which is engaged with the inner gear 105 the gear wheel 96. Accordingly, the shaft 46 of rotation of the stirrer causes the stirrer 45 to rotate.

When the inner gear wheel 106 of the driving gear 97 of the agitator rotates, the outer gear 107 of the gear of the agitator gear 97 is rotated integrally with the inner gear 106. Then the detecting gear 98 is rotated and engaged with the outer gear of the gear 107 of the gear. wheels 97 mixers.

When the developing cartridge 30 is not used, the detecting gear 98 is in the position shown in FIG. 14, in which the detecting gear 98 with a coil spring 110 is engaged with the outer gear 107 of the agitator gear 97. As soon as the detecting wheel 98 starts to rotate, the toothless portion of the detecting wheel 98 is facing the outer gear 107 of the agitator gear 97, so that the detecting wheel 98 is not engaged with the outer gear 107. Therefore, the detecting gear 98 cannot resume rotation. The protrusion 109, determining the use of an unused cartridge manifestations 30, moves only in one direction along the window 114 for detection. In the laser printer 1, the determination of whether the installed cartridge is used or not is carried out by detecting whether the protrusion 109 determining the use has moved with the detection sensor (not shown) provided in the main body 2.

(3) Electrode element

As shown in FIGS. 6, 8 and 15, a support member 201 supporting the end of the shaft 52 of the developing roller is provided on the left side wall 69L as the first side wall. The supporting element 201 is made of a non-conductive resin material and has the form of a flat plate. The sleeve portion 202, which has an inner diameter substantially the same as the diameter of the shaft 52 of the developing roller, is formed on the carrier 201 as a unit with it at its rear end. The sleeve portion 202 is cylindrical, and a shaft 52 of the developing roller is inserted therein. The end of the shaft 52 showing the roller is supported with the possibility of sliding and rotation on the inner peripheral surface of the sleeve part 202.

On the rear side of the carrier 201, two engagement holes 128 are provided so that the sleeve portion 202 can be positioned vertically between the two engagement holes 128. An opening (not shown) is made on the front side of the carrier 201 to enclose a feed roll shaft 50 therein. On the right side wall 69R, in the positions corresponding to the engagement holes 128, two engagement protrusions 129 are formed. The carrier 201 is attached to the side wall 69R in such a way that the rear end of the carrier 201 is flush with the rear end of the right side wall 69R. When the carrier 201 is attached to the side wall 69R, the developing roller shaft 52 and the feeding roller shaft 50 are inserted into the sleeve portion 202 and the (not shown) hole, and the engagement tabs 129 fit into the corresponding engagement holes 128.

The electrode element 117 as an electrode for applying a developing bias voltage to the shaft 52 of the developing roller is made on the surface of the bearing element 201. The electrode element is made of an electrically conductive resin including carbon powders. The electrode element 117 is made of an electrically conductive resin including carbon particles. The electrode element 117 is provided integrally formed with a mounting plate 120, a part 118 covering the shaft of the developing roller, as a part serving as a support for the shaft of the developing roller, and an end part 119.

The mounting plate 120 is formed from a thin plate to give it a substantially triangular shape when viewed from the side. Part 118 covering the developing roller shaft is provided at the rear end of the mounting plate 120. Part 118 covering the developing roller shaft has a cylindrical shape for enclosing the end of the developing roller shaft 52 therein and is concentric with the sleeve portion 202. Part 118 covering the developing shaft the roller extends in a first direction from the rear end of the mounting plate 120.

The shaft 52 of the developing roller has a part with a large diameter that rests on the sleeve part 202, and a part with a small diameter that rests on the part 118 that covers the shaft of the developing roller. The diameter of the part with a large diameter is larger than the diameter of the part with a small diameter. The outer diameter of the developing roller covering shaft portion 118 is substantially the same as the inner diameter of the sleeve portion 202. When the developing roller covering portion 118 is inserted over the developing roller shaft 52, some portion of the developing roller covering portion 118 is seated. into the sleeve portion 202.

An end portion 119 is provided at the front end of the mounting plate 120, while maintaining a certain distance between the end portion 119 and the portion 118 covering the shaft of the developing roller in the front to back direction. The end portion 119 is provided with a base 121 and a contact plate 122 as a contact part.

The base 121 is integral with the base plate 123, which extends vertically, forming an essentially elliptical profile when viewed from the side, and with an outer rib plate 124 of a loop-like shape that protrudes outward in the width direction of the developing cartridge 30 from the outer periphery of the plate 123 grounds. A portion of the outer rib plate 124 formed at the upper end of the base plate 123 projects outward in a first direction farther than the rest of the outer rib plate 124.

The contact plate 122 is substantially U-shaped when viewed from the side, which opens downward. The contact plate 122 protrudes outward in a first direction from the outer rib plate 124 formed on the upper end of the base plate 123.

The mounting plate 120 is made having an upper reinforcing rib 125, a lower reinforcing rib 126 and a part 127 covering the feed roller shaft, as a part supporting the feed roller shaft. The upper reinforcing rib 125 protrudes outward in a first direction from the mounting plate 120. The upper reinforcing rib 125 is designed so that it extends back and down towards the shaft covering portion 118 of the developing roller from the rear end of the contact plate 122 and is connected to the part 118, covering shaft showing the platen.

The lower reinforcing rib 126 protrudes outward in a first direction from the mounting plate 120, forming a substantially U-shape when viewed from the side, which opens upward, covering the lower portion of the end portion 119. More specifically, the lower reinforcing rib 126 includes a first a lower reinforcing rib 126A, a second lower reinforcing rib 126B, and a third lower reinforcing rib 126C, which are continuous.

The first lower reinforcing rib 126A extends back and down from its upper end. The upper end of the first lower reinforcing rib 126A is connected to the upper reinforcing rib 125 provided between the part 118 covering the shaft of the developing roller and the end portion 119. The lower end of the first lower reinforcing rib 126A is connected to the third lower reinforcing rib 126C.

The upper end of the second lower reinforcing rib 126B is connected to the front lower end of the base 121. The upper end of the second lower reinforcing rib 126B extends back and down parallel to the first lower reinforcing rib 126A. The lower end of the second lower reinforcing rib 126B is connected to the third lower reinforcing rib 126C.

A third lower reinforcing rib 126C is located below the base 11, connecting the lower ends of the first lower reinforcing rib 126A and the second lower reinforcing rib 126B.

The feed roller closing portion 127 is located between the base 121 and the third lower reinforcing rib 126C. The portion 127 covering the feed roll shaft has a cylindrical shape for enclosing the end of the feed roll shaft 50 therein. A portion 127 covering the feed roller shaft protrudes outward in a first direction from the mounting plate 120 by a distance less than the outer rib plate 124.

In the base plate 132, available in the base 121, a hole for a screw (not shown) is made. In the carrier 201 in a position corresponding to a screw hole of the base plate 123, a screw hole (not shown) is formed. A threaded hole (not shown) is made in the right side wall 69R in the position corresponding to the screw hole of the base plate 123.

The electrode element 117 is attached to the right side wall 69R, allowing the ends of the shaft 52 of the developing roller and the shaft 50 of the feeding roller to be inserted into the part 118 that covers the shaft of the developing roller, and the part 127 that covers the shaft of the feeding roller, respectively, with a screw 130 that is inserted into the hole under the screw of the base plate 132 and screwed into the threaded hole made in the right side wall 69R through the screw hole in the bearing member 201.

With this design, the end of the shaft 52 of the developing roller is in sliding contact with the inner peripheral surface of the portion 118 covering the shaft of the developing roller. Similarly, the end of the feed roll shaft 50 is in sliding contact with the inner peripheral surface of the portion 127 covering the feed roll shaft.

When the process cartridge 20, having the development cartridge 30 enclosed therein, is inserted into the main body 2, a developing bias voltage terminal 131 provided as a supply element in the main body 2 comes into elastic contact with the upper surface of the contact plate 122, as shown in FIG. .15 dashed line.

More specifically, the contact plate 122 is located near the feed roll shaft 50 inserted into the feed roll cover portion 127 in relation to the vertical direction. The developing bias voltage terminal 131 is in elastic contact with the contact plate 122 on its surface opposite the surface facing the feed roll shaft 50.

A developing bias voltage terminal 131 is connected to a high voltage circuit board (not shown), which is provided in the main body 2 for applying a developing bias voltage. When the developing bias voltage terminal 131 is in elastic contact with the contact plate 122, the developing bias voltage from the high voltage circuit board is applied to the developing roller shaft 52 by an electrode member 117 made of an electrically conductive resin. Then, a developing bias voltage is applied from the shaft 52 of the developing roller to the conductive polymer roller 53.

The electrode element 117 rests on both the shaft 52 of the developing roller and the shaft 50 of the feed roller, therefore, the same bias voltage as the developing bias voltage is applied to the electrically conductive sponge roller 51 by the shaft 50 of the feed roller.

(4) Relative positions of input gear and electrode element

In the developing cartridge 30, the contact plate 122 of the electrode element 117 is located in the projection plane when the input gear 94 is projected in a direction parallel to the shaft 52 of the developing roller, that is, in the first direction, as shown in FIGS. 11, 13 and 15.

More specifically, as shown in FIGS. 19 and 20, the contact plate 122 of the electrode element 117 is located in the projection plane when the driven connecting part 100 of the input gear 94 is projected in the first direction. In addition, the contact plate 122 is in contact with the developing bias voltage terminal 131 in the projection plane when the driven coupling part 100 is projected in the first direction. In particular, the contact plate 122 is located in contact with the developing bias voltage terminal 131 on a continuous line (second axial line X2, as will be described later) of the input gear support shaft 99 on which the driven coupling part 100 rotates.

As shown in FIG. 11, the first axial line X1, which is the axis of the shaft 52 of the developing roller, and the second axial line X2, which is the axis of the input gear 94, are arranged in parallel and equidistant from front to back. A part of the contact plate 122 of the electrode element 117 is located on the second axial line X2. More specifically, as shown in FIG. 13, the first line L1 connects, in a direction perpendicular to the axial direction of the developing roller shaft 52, the axis of the input gear bearing shaft 99, on which rotates the input gear wheel 94, and the axis of the shaft 52 of the developing roller, on which the developing roller 38 rotates. As shown in Fig. 15, the second line L2 connects, in a direction perpendicular to the axial direction of the shaft 52 of the developing roller, a point the contact of the contact plate 122 with the developing bias voltage terminal 131, which is part of the contact plate 122 of the electrode element 117, and the axis of the bearing roller 52 of the developing roller on which the developing roller 38 rotates. As shown in FIG. 11, the first line L1 and the second line L2 are parallel each other. The first distance D1 between the first center line X1 and the second center line X2, as shown in FIG. 13, and the second distance D2 between the first center line X1 and the second center line X2, as shown in FIG. 15, are equal.

(5) Effects of cartridge manifestations

In the developing cartridge 30 having the above-described construction, the contact plate 122 of the electrode element 117 is located in the projection plane when the input gear 94 is projected in a direction parallel to the shaft 52 of the developing roller, which is the first direction. More specifically, the contact plate 122 of the electrode element 117 is located in the projection plane when the driven connecting part 100 is projected in the first direction. In some aspects, the contact plate 122 is in contact with the developing bias voltage terminal 131 in the projection plane when the driven coupling part 100 is projected in the first direction. In particular, the contact plate 122 contacts the developing bias voltage terminal 131 along a continuous line of the input gear support shaft 99 on which the driven coupling part 100 rotates. In addition, the first axial line X1 and the second axial line X2 are parallel to each other. Part of the contact plate 122 of the electrode element 117 is located on the second axial line X2. More specifically, the first line L1 and the second line L2 are parallel to each other, and the first distance D1 and the second distance D2 are equal.

Therefore, even when rotational or torsional power is applied to the developing cartridge 30, which rotates or twists the developing cartridge 30 around the input gear wheel 94 when the driving force from the electric motor is supplied to the driven coupling part 100 from the driving coupling part 200, significant effects can be prevented. rotational or torsional power to the contact plate 122 of the electrode element 117. Therefore, the contact plate 122 is prevented from leaving its position. Thus, the contact plate 122 and the developing bias voltage terminal 131 are in sliding contact with each other, whereby it is possible to stably supply power from the electrode element 117 to the shaft 52 of the developing roller.

If the contact point between the contact plate 122 and the developing bias voltage terminal 131 is in any position in the projection plane when the driven coupling part 100 is projected in the first direction, the effects of any rotational or torsional power can be minimized.

In addition, in the development cartridge 30, each end of the developing roller 38 is supported in the left and right side walls 69L, 69R due to the fact that each end of the shaft 52 of the developing roller is rotationally supported in the left or right side walls 69L, 69R. Accordingly, when the developing roller 38 is firmly supported, the developing bias voltage can be stably applied to the rubber roller 53.

One end of the developing roller shaft 52 is rotatably supported in the insertion shaft portion 111 of the gear cover 93 of the gears by the sleeve member 116. The other end of the developing roller shaft 52 is rotatably supported in the electrode roller closing portion 118 that covers the shaft of the developing roller. Each end of the developing roller 38 also rests on a part 111 for inserting a shaft of the developing roller of the gear cover 93 or a part 118 covering the shaft of the developing roller of the electrode element 117. Thus In some cases, the developing roller 38 can be reliably supported, and the developing roller shaft 52 is efficiently inserted into the 111 for inserting the developing roller shaft of the gear cover 93 or the 118 closing shaft of the developing roller of the electrode member 117. Therefore, it is possible to reliably apply the developing bias voltage to the rubber roller 53.

The electrode element 117 in the development cartridge 30 is made of conductive resin. Therefore, the electrode element 117 can be given any shape for applying a developing bias voltage to the rubber roller 53.

When the process cartridge 20, having the developing cartridge 30 enclosed therein, is mounted in the main body 2, the developing bias voltage terminal 131 is in elastic contact with the upper surface of the contact plate 122. The developing bias voltage is applied from the developing bias voltage terminal 131 to the developing roller shaft 52 using the high voltage motherboard by means of the electrode element 117. Then, a developing bias voltage is applied from the shaft 52 of the developing roller to the conductive a rubber roller 53. Thus, it is possible to secure application development bias voltage to the electrode member 117 to the rubber roller 53.

The shaft 52 of the developing roller is made of metal, which also ensures reliable application of the voltage of the developing bias from the electrode element 117 to the rubber roller 53. In addition, in the developing cartridge 30, the part 118 covering the shaft of the developing roller of the electrode element 117 provides support for rotation of the shaft 52 developing roller. Therefore, the shaft support 52 of the developing roller provided by another element or other components is not required. Thus, a reduction in the number of components and their cost can be achieved.

In the developing cartridge 30, the input gear 94 is integral with the driven coupling part 100 and the driving gear 101. Therefore, once the driven coupling part 100 can reliably receive the driving force from the driving coupling part 200, the driving gear 101 transmits the driving force to the driving gear the gear wheel 95 of the feed roller, the drive gear 115 of the developing roller and the intermediate gear 96. Thus, it is possible to ensure reliable rotation of the shaft 50 of the feed roller and the shaft 52 of the developing shaft Single and shaft 46 rotating stirrer.

The driven coupling part 100 is in the form of a hollow cylinder. The driven coupling part 100 is in the form of a ring gear with engagement limiting parts 102 protruding radially inward from the inner peripheral surface of the driven connecting part 100. Therefore, when the engaging limiting portion 102 is engaged with the driving coupling part 200, reliable transmission of the driving force with leading connecting part 200.

Since the driving wheel 101 of the input gear 94 is engaged directly with the driving gear 115 of the developing roller, the driving force that is supplied from the driving coupling portion 200 to the input gear is transmitted directly to the driving gear 115 of the developing roller from the input gear. Therefore, it is possible to reliably rotate the developing roller 38. In addition, when the driving force is transmitted in this manner, the driving force is transmitted from the main body 2 not directly to the driving gear 115 of the developing roller, whereby the developing roller shaft 52 can be used as a guide. More specifically, when the developing cartridge 30 is installed in the developing cartridge mounting portion 147, the sleeve member 116 and the developing roller closing portion 118 provided on the developing roller shaft 52 are guided along the guide grooves 153. Thus, the developing roller shaft 52 can be used like a guide. Therefore, there is no need for an additional guide and it is possible to reduce the number of components used and their cost.

The drive gear 101 of the input gear 94 is also engaged directly with the drive gear 95 of the feed roller, whereby the driving force supplied from the drive coupling 200 to the input gear 94 is transmitted directly to the drive gear 95 of the feed roller. Therefore, it is possible to ensure reliable rotation of the feed roller 37. Furthermore, when the driving force is transmitted in this manner, the driving force is transmitted directly from the input gear 94 to the driving gear 115 of the developing roller and the driving gear 95 of the feeding roller. Thus, it becomes possible to efficiently transmit the driving force and ensure reliable rotation of the developing roller 38 and the feed roller 37.

The electrode element 117 is provided with a part 118 that covers the shaft of the developing roller and a part 127 that covers the shaft of the feed roller. Accordingly, it is possible to reliably support the shaft 52 of the developing roller and the shaft 50 of the feeding roller to the part 118 that covers the shaft of the developing roller, and the part 127 that covers the shaft of the feeding roller, respectively.

When the developing cartridge 30 is installed in the main body 2, the developing bias voltage terminal 131 is in elastic contact with the upper surface of the part 118 covering the shaft of the developing roller and the part 127 covering the shaft of the feeding roller, and opposite the surface facing the shaft 50 of the feeding roller. Therefore, it is possible to achieve reliable contact between the developing bias voltage terminal 131 and the contact plate 122. Thus, it is possible to reliably apply the developing bias voltage using a high voltage circuit board (not shown) to the contact plate 122 by the developing bias voltage terminal 131.

When the developing cartridge 30 is installed in the developing cartridge developing cartridge portion 147 of the drum frame 58, the front ends of the bosses 132 are in contact with the respective clamping arms 150. Under the influence of the forcing force of the compression springs, forcing the movement of the clamping arms 150, the respective clamping arms 150 exerts pressure on each boss 132 towards the back. Thus, the developing roller 38 is pressed against the drum 28. With reliable contact between the developing roller 38 and the drum 28, it is possible to reliably develop an electrostatic latent image formed on the drum 28 using the toner carried on the developing roller 38.

Each boss 132 protrudes outward in a first direction from the outer surface of each of the left and right side walls 69L, 69R on the front lower side of each side wall 69L, 69R. With this design, the boss 132 can reliably contact with the corresponding clamping levers 150, as a result of which reliable contact between the developing roller 38 and the drum 28 can be guaranteed.

The development cartridge 30 is removably mounted in the drum cartridge 27. The developing cartridge can be replaced with a new one according to the residual toner, regardless of the life of the drum 28. The drum cartridge 27 can be replaced with a photoconductive element. The photoconductive cartridge can be replaced in accordance with the service life of the drum 28, regardless of the residual toner contained in the cartridge 30 manifestations.

3. Other aspects

(1) An electrode element in accordance with other aspects

In the above description, it is indicated that the electrode element 117 as an electrode including a mounting plate 120, a part 118 covering the shaft of the developing roller, and an end part 119, as shown in Figs. 6, 8 and 15, are made as a single unit of electrically conductive pitches. However, the mounting plate 120, the part 118 covering the shaft of the developing roller, and the end part 119 can be made separate, and then assembled together to obtain the electrode element 117.

For example, the terminal portion 119 provided with a base 121 and a contact plate 122 can be made of metal as a unit as an electrode. The mounting plate 120 and the part 118 covering the shaft of the developing roller can be made integrally of an electrically conductive resin as an electrically conductive element. Then, the end portion 119 can be fastened to the mounting plate 120 with a screw 130. In this way, the fastener 117 can be formed.

With such an electrode element 117, it is possible to reliably apply the developing bias voltage to the contact plate 122 from the developing bias voltage terminal 131, because the terminal portion 119 is made of metal. It is possible to reliably supply power to the shaft 52 of the developing roller by means of a mounting plate 120 and a portion 118 covering the shaft of the developing roller from the terminal portion 119, which is a part of the electrode element 117.

The terminal portion 119 is in indirect contact with the shaft 52 of the developing roller through the contact plate 120 and the portion 118 that covers the shaft of the developing roller. Therefore, it is possible to select without limitation the position of the end portion 119 relative to the shaft 52 of the developing roller or the position of the shaft 52 of the developing roller relative to the end portion 119. Thus, increasing the efficiency of the structure, it is possible to reliably supply power from the contact plate 122 to the shaft 52 of the developing roller.

(2) Shaft showing the platen, other aspects

In the foregoing description, it is indicated that the shaft 52 of the developing roller is made of metal. However, the shaft 52 of the developing roller is made of conductive resin. In addition, the shaft 52 of the developing roller may be made of an insulating material, such as an insulating resin material.

When the shaft 52 of the developing roller is made of insulating material, the electrode element 117 and the rubber roller 53 can be electrically connected, the developing bias voltage can be applied directly from the electrode element 117 to the rubber roller 53. In this case, the resistance of the rubber roller 53 can be set lower than the resistance of the rubber roller 53, corresponding to the above aspects.

For example, as shown in FIG. 18, the surface of the developing roller shaft 52A made of insulating material may be coated with an electrical conductive sheet 154 made of a metal foil, such as aluminum foil, to provide contact with the rubber roller 53. The electrical conductive sheet 154 may contact the inner the peripheral surface of the portion 118 covering the shaft of the developing roller. With this design, the developing bias voltage can be applied from the electrode element 117 to the rubber roller 53 by means of the conductive sheet 154.

(3) Input gear in accordance with other aspects

In the above description, it is indicated that the input gear 94 is integral with the driven coupling part 100 and the drive gear 101. However, the input gear 94 may be integral with, for example, the drive gear 101 and the gear limiting parts 102.

On Fig presents a perspective image of a development cartridge corresponding to Fig.6, while the electrode element is detached from the development cartridge, in accordance with an illustrative aspect. On Fig presents a perspective image of a development cartridge corresponding to Fig, while the electrode element is detached from the development cartridge. On Fig presents a right view of the cartridge manifestations corresponding to Fig. On Fig presents a cross section of the cartridge manifestations, drawn along the line aa shown in Fig.23. On Fig presents a cross section of the cartridge manifestations, drawn along the line BB, shown in Fig.23.

Now, with reference to FIGS. 21-25, a detailed description will be given of a development cartridge in accordance with some additional aspects. It should be noted that the same positions denote the same elements, and their detailed description is omitted.

A developing cartridge 30, in accordance with some aspects, has a developing frame 36 similar to a developing frame of a developing cartridge 30 corresponding to the above aspects, with the exception of the following structures.

As shown in FIGS. 21 and 22, the developing frame 36, in accordance with some aspects, has a cylindrical screw portion 79 as a screw portion for attaching the electrode element 117 to a right side wall 69R covering the side (right side) of the developing chamber 42 The cylindrical portion 79 for the screw has a cylindrical shape, protruding outward from the side wall 69R. On the inner circumferential surface of the screw part 79 for screw, threaded grooves are made for screwing the shaft 130a of the screw 130 into the cylindrical part 79 for the screw. The upper and lower ends of the free end 79a of the screw cylindrical part 79 have cutouts along the front to back direction. Thus, the free end 79a is substantially oval in shape with flat parts at its upper and lower ends extending from front to back.

(2) Gear mechanism and gear cover

A development cartridge 30, in accordance with some aspects, has a gear mechanism 92 and a gear cover 93 similar to those of the development cartridge 30 corresponding to the previously described aspects.

(3) Electrode element

The development cartridge 30, in accordance with certain aspects, has an electrode element 117 similar to that of the development cartridge 30 in accordance with the previously described aspects.

An opening 161 is provided on the front side of the carrier 201. When the carrier 161 is attached to the right side wall 69R, the shaft 52 of the developing roller 52 is inserted into the sleeve portion 202 and the shaft 50 of the feeding roller is inserted into the hole 161. To prevent a situation in which the cylindrical portion 79 under the screw, protruding outward from the right side wall 69R in the first direction, interferes with the bearing member 201, a cut is made in the part of the outer periphery of the bearing member 201, where the cylindrical screw part 79 extends. When the carrier 201 is attached to the right side wall 69R, the screw cylindrical portion 79 is exposed from the outer periphery of the carrier 201.

The electrode element 117 as an electrode for applying a developing bias voltage to the shaft 52 of the developing roller is separate from the carrier element 201 on the right side wall 69R, so that part of the carrier element 201 is between the right side wall 69R and the electrode element 117. As shown in FIG. 24, the base plate 123 as the fastener of the electrode element 117 is parallel to the fastener plate 120 in a position outside of the fastener plate 120 with respect to the first direction. As shown in FIGS. 21 and 22, the screw hole 140 as a part for insertion is formed substantially in the central part of the base plate 123. In connection with the free end 79a of the screw cylindrical part 79, the screw hole 140 is substantially oval in shape with flat parts that extend from front to back.

The outer rib plate 124 extends in a first direction from the outer periphery of the base plate 123, connecting the plate 123 and the mounting plate 120. In a developing cartridge 30, in accordance with some aspects, the electrode member 117 is attached to the right side wall 69R as follows. First, the ends of the shaft 52 of the developing roller and the shaft 50 of the feeding roller are inserted into a portion 118 covering the shaft of the developing roller and a portion 127 covering the shaft of the feeding roller, respectively. In this case, the screw cylindrical part 79 provided on the right side wall 69R is inserted into the screw hole 140 in the base plate 123, fitting the free end 79a of the screw cylindrical part 79a into the screw hole 140. After that, the screw 130 as a fastening element is screwed into the cylindrical part 79 under the screw open from the side of the base plate 123.

The screw 130 is integrally formed with a rod 130a having screw threads made along its axial direction and a screw head 130b provided at the end of the rod 130a to prevent separation of a part that extends like a mushroom in the radial direction of the rod 130a. The diameter of the screw head 130b is the same as the diameter of the cylindrical screw portion 79, or slightly larger.

As shown in FIGS. 14 and 25, the screw 130 is screwed into the cylindrical part 79 under the screw until the inner end (with respect to the axial direction of the screws) of the screw head 130b comes into contact with the free end face Ff as the third end face of the cylindrical parts 79 under the screw.

When the electrode element 117 is thus attached to the right side wall 69R, the mounting plate 120 located between the portion 118 that covers the shaft of the developing roller and the base part 123 is in contact with the carrier element 201, so that the electrode element 117 is positioned relative to the first direction (the direction of the width of the cartridge manifestations 30). The free end face Ff of the screw cylindrical part 79 is positioned so that it protrudes slightly (for example, 0.2 mm) outward in the first direction to the side of the screw head 130b from the outer face Of as the first end of the base plate 123.

The inner - with respect to the axial direction of the screws 130 - end face of the screw head 130b is in contact with the free end face If of the screw cylindrical part 79 and faces the outer edge Of the base plate 123, while there is a small distance above and below the screw shaft 130a (e.g. 0.2 mm). A screw head 130b located in a position opposite the free end Ff of the screw cylindrical part 79 limits or prevents the base plate 123 from separating from the screw cylindrical part 79 or removing said plate from this part.

Due to the distance between the inner (with respect to the axial direction of the screws) end face If of the head 130b of the screw and the outer face Of the base plate 123, the electrode element 117 does not come into tight contact with the outer face Of the base plate 123. Accordingly, the electrode element 117 is able to make small movements due to the presence of a small gap between the electrode element 117 and the cylindrical screw part 79. When the developing bias voltage terminal 131 provided in the main body 2 is in elastic contact with the upper surface of the contact plate 122, the part 118 covering the shaft of the developing roller makes a small movement within the range of the small gap between the electrode element 117 and the cylindrical screw part 79 . Accordingly, the outer circumferential surface of the end of the shaft 52 of the developing roller is in sliding and tight contact with the inner circumferential surface of the portion 118 covering the shaft of the developing roller. Thus, the end of the shaft 52 of the developing roller is rotatably supported against a portion 118 covering the shaft of the developing roller. The portion 127 covering the feed roller shaft also moves within the range of the small gap. Therefore, the outer circumferential surface of the end of the feed roller shaft 50 is also in sliding and tight contact with the inner circumferential surface of the portion 127 covering the feed roller shaft. Thus, the end of the feed roll shaft 50 is rotationally supported on a portion 127 covering the feed roll shaft.

(4) Effects of cartridge manifestations

As described above, the electrode element 117 in the cartridge 30 manifestations can make a slight movement within the range of a small gap. When the developing bias voltage terminal 131 provided in the main body 2 is in elastic contact with the upper surface of the contact plate 122, the part 118 covering the developing roller shaft moves within the range of the small gap. Accordingly, since the outer circumferential surface of the end of the developing roller shaft 52 is in reliable contact with the inner circumferential surface of the developing roller shaft portion 118, this developing roller shaft 52 rotates. In other words, the part 118 covering the shaft of the developing roller is rotationally supported on the shaft 52 of the developing roller, and the electrode element 117 is moved so that the part 118 closing the shaft of the developing roller makes reliable contact with the shaft 52 of the developing roller when terminal 131 the developing bias voltage is in contact with the contact plate 122. Therefore, it becomes possible to reliably apply the developing bias voltage from the developing bias voltage terminal 131 to the developing roller shaft 52 by ohm contact plate 122 and a portion 118 that covers the developer roller shaft.

The electrode element in the development cartridge 30 is securely attached to the right side wall 69R with a screw 130 so that this electrode element can make a slight movement within a small gap.

More specifically, when the inner end (with respect to the axial direction of the screws 130), the end face If of the screw head is in contact with the free end face Ff of the screw cylindrical part 79, the screw head 130b and the base plate 123 are arranged so that there is some distance between them. Thus, it is possible to ensure the distance between the outer edge Of the base plate 123 and the inner end If of the screw head 130b accurately and reliably. As a result of this, it becomes possible to reliably contact the developing roller part 118 with the developing roller shaft 52 with a guarantee of smooth rotation of the developing roller shaft 52 with respect to the part 118 covering the developing roller shaft.

In the developing cartridge 30, the developing roller cover portion 118 and the contact plate 122 are provided to protrude outward in a first direction from the right side wall 69R along the developing roller shaft 52. Therefore, since the contact plate 122 is in reliable contact with the developing bias voltage terminal 131, it is possible to guarantee smooth rotation of the developing roller shaft 52 with respect to the developing roller covering portion 118 and ensuring reliable contact of the developing roller shaft closing portion 118 with the developing shaft 52 roller.

In the developing cartridge 30, the feeding roller closing portion 127 is provided with an electrode member 117. Since the feeding roller shaft 50 reliably rests on the feeding roller covering portion 127, it is also possible to apply a developing bias voltage to the feeding roller shaft 50.

In the developing cartridge 30, a carrier 201 is provided on the right side wall 69R separately from the electrode element 117. Since the carrier 102 can support or support the shaft 52 of the developing roller, it becomes possible to reliably contact the part 118 that covers the shaft of the developing roller with the developing shaft 52 roller with a guarantee of smooth rotation of the shaft 52 showing the roller. Even when the carrier cannot be used as an electrode, it is possible to reliably supply power to the shaft 52 of the developing roller.

(5) Electrode element in accordance with other aspects

In the above description, it is indicated that if there is a distance between the inner end If of the screw head 130b and the outer edge Of the base plate 123, the part 118 covering the shaft of the developing roller is moved so that its inner peripheral surface is in reliable contact with the outer peripheral surface of the shaft end 52 developing roller. At the same time, it is possible to move the part 118 covering the shaft of the developing roller in a different way so that its inner peripheral surface is in reliable contact with the outer peripheral surface of the end of the shaft 52 of the developing roller.

For example, before attaching the electrode element 117 to the right side wall 69R, it is possible to make the electrode element 117 such that the distance between the center of the screw hole 140 of the electrode element 117 and the axis of the part 118 covering the shaft of the developing roller is slightly different from the distance between the axis of the cylindrical part 79 under the screw and the shaft axis 52 of the developing roller. When the electrode element 117 made in this way is attached to the right side wall 69R, the center of the screw hole 140 aligns with the axis of the axis of the screw cylindrical portion 79. However, the axis of the part 118 covering the shaft of the developing roller and the axis of the shaft 52 of the developing roller are slightly spaced apart and do not match. Therefore, the outer peripheral surface of the end of the shaft 52 of the developing roller is in reliable contact with the inner peripheral surface of the portion 118 covering the shaft of the developing roller.

Although this description is given in connection with the possible aspects highlighted above, various alternatives, modifications, changes, improvements, and / or substantial equivalents that already exist or might be expected to appear in the future may be known to those of ordinary skill in the art. . Accordingly, the possible aspects of the description set forth above should be considered as illustrative and not restrictive. Within the essence and scope of the claims described above, various changes are possible. Therefore, the description should be considered to encompass all alternatives, modifications, changes, improvements, and / or substantial equivalents that are already known or may appear in the future.

Industrial applicability

In the development cartridge of the present invention, the electrode is maintained in such a position that a stable supply of power to the shaft of the developing roller is possible. When assembling such a development cartridge by installing it in the image forming apparatus, an excellent output image can be obtained. Thus, this developing cartridge is undoubtedly advantageous for an image forming apparatus such as a laser printer.

Claims (7)

1. The cartridge (30) manifestations containing
a housing (36) including a first side wall (69R) and a second side wall (69L) opposite the first side wall (69R),
a developing roller (38) located between the first side wall (69R) and the second side wall (69L), wherein the developing roller (38) includes a developing roller shaft (52) rotatable during development and an element (53 ) a developing roller adapted to carry the developing substance thereon, wherein the developing roller element (53) is located around the developing roller shaft (52), and the developing roller shaft (52) rotates around the first center line (X1) during development,
an electrode (117) located on the first side wall (69R) next to the shaft (52) of the developing roller, wherein the electrode (117) is electrically connected to the element (53) of the developing roller, and
the driven connecting part (94) located on the second side wall (69L), and the driven connecting part (94) is connected to the leading connecting part (200) of the image forming apparatus (1) and is rotatable around the second axial line (X2),
wherein the electrode (117) has a contact part (122), which is arranged to contact the supply element of the image forming apparatus (1), and
when the driven connecting part (94) protrudes in a direction parallel to the shaft (52) of the developing roller, at least a part of the contact part (122) is located within this protruding part. 2. The cartridge (30) according to claim 1, in which the electrode (117) surrounds the circumference of the shaft (52) of the developing roller. 3. The cartridge (30) according to claim 1, in which the developing roller (38) includes a gear (115) of the developing roller connected to the shaft (52) of the developing roller rotatably with it, and a driven connecting part (94 ) includes a drive gear (101) that engages with a gear (115) of the developing roller. 4. The cartridge (30) according to claim 3, further comprising a feed roller (37) configured to supply a developing substance to the developing roller (38), the feeding roller (37) being parallel to the developing roller (38),
wherein the feed roller (37) includes a feed roller shaft (50) rotatably during development, a feed roller element (51) configured to supply a developing substance to the developing roller (38), wherein the element (51) the feed roller is located around the shaft (50) of the feed roller, and the gear wheel (95) of the feed roller connected to the shaft (50) of the feed roller can rotate with it, and the gear wheel (95) of the feed roller is made to mesh with the drive gear wheel (10 one). 5. The cartridge (30) according to claim 4, in which the electrode (117) is electrically connected to the shaft (50) of the feed roller. 6. The cartridge (30) according to claim 5, in which the electrode (117) has a first part (118) configured to surround the circumferential part of the shaft (52) of the developing roller, and a second part (127) configured to surround the circumferential part shaft (50) of the feed roller. 7. The cartridge (30) according to claim 6, in which the contact part (122) is located above the first part (118) and the second part (127).

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