JP4035691B2 - Spring mounting apparatus and recording apparatus provided with the spring mounting apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation-driven conveyance driving roller that conveys a recording material, a conveyance driven roller that is driven to rotate while being pressed against the conveyance driving roller, and a conveyance driven roller holder that pivotally supports the conveyance driven roller. And a torsion coil spring that urges the conveyer driven roller holder, and a spring mounting device for attaching the torsion coil spring to the frame member. The present invention also relates to a recording apparatus provided with the spring mounting device.
[0002]
[Prior art]
2. Description of the Related Art A recording apparatus typified by a fax machine, a printer, or the like has a conveyance drive roller that is rotated and conveys a recording material at a constant pitch to a recording unit that performs recording on the recording material, and is in pressure contact with the conveyance driving roller. A transport driven roller that is driven and rotated, a transport driven roller holder that pivotally supports the transport driven roller, and a transport driven roller holder that includes a plate-like body that is long in the width direction of the recording material. A frame member having one end, and one end urges the conveyance driven roller holder from above, and the other end is latched on a spring latching portion provided on the frame member, so that the conveyance driven roller holder is Some include a torsion coil spring that is urged to rotate in a direction in which the roller is pressed against the transport driving roller.
[0003]
In such a recording apparatus, conventionally, the torsion coil spring has been provided by a spring mounting apparatus as shown in FIG. Here, FIG. 10 is a perspective view of the transport driven roller holder 200 according to the prior art. In FIG. 10, reference numeral 202 denotes a conveyance driving roller that is rotationally driven, reference numerals 201 and 201 denote conveyance driven rollers that are driven to rotate while being pressed against the conveyance driving roller 202, and reference numeral 200 denotes the conveyance driven rollers 201 and 201. Reference numeral 203 denotes a supported conveyance driven roller holder, reference numeral 203 denotes a frame member constituting a base of a recording apparatus according to the prior art (not shown) to which the conveyance driven roller holder 200 is attached, and reference numeral 204 denotes a twist that biases the conveyance driven roller holder 200. A coil spring is shown.
[0004]
In FIG. 10, the frame member 203 erected in parallel with the vertical surface is formed with horizontal bent portions 203b, 203b and projections 203c, 203c at the lower end, and the transport driven roller holder 200 is connected to the bent portion. 203b, 203b and a rotation shaft 205 pivotally supported by the projections 203c, 203c, and provided in a direction in which the conveyance driven rollers 201, 201 are pressed against the conveyance driving roller 202 by a torsion coil spring 204. It is urged to rotate.
[0005]
[Problems to be solved by the invention]
Here, the torsion coil spring 204 is attached as follows. That is, the rotation shaft 205 is attached to the conveyance driven roller holder 200 while being inserted through the coil portion 204 a, whereby the torsion coil spring 204 is attached to the conveyance driven roller holder 200. Next, the pivot shaft 205 is pivotally supported by the bent portions 203 b and 203 b and the projecting portions 203 c and 203 c, and the one end 204 b of the torsion coil spring 204 is latched by the spring latching portion 203 a provided on the frame member 203. As described above, in the attaching operation of the torsion coil spring 204, the rotating shaft 205 needs to be inserted into the coil portion 204a in advance, and the operation becomes complicated.
[0006]
Therefore, the present invention has been made in view of such a situation, and an object thereof is to make it possible to more easily and quickly attach a torsion coil spring that urges the conveyance driven roller holder.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, a spring mounting apparatus according to claim 1 of the present application includes a rotationally driven transport driving roller that transports a recording material at a constant pitch to a recording unit that performs recording on the recording material, Conveying driven roller that is driven to rotate by being brought into pressure contact with the conveying driving roller, a conveying driven roller holder that pivotally supports the conveying driven roller, and a plate-like body that is long in the width direction of the recording material. A frame member provided with the conveyance driven roller holder, and one end urges the conveyance driven roller holder from above, and the other end is latched on a spring latching portion provided on the frame member, whereby the conveyance driven roller And a torsion coil spring that urges the holder to rotate in a direction in which the transport driven roller is pressed against the transport drive roller. The torsion coil spring is attached to the frame member. A spring mounting device that is located above the transport driven roller holder and has a concave shape that forms an opening for receiving an upper portion of the coil portion of the torsion coil spring on the side facing the transport driven roller holder. In the side view of the recording material conveyance path, the conveyance driven roller holder is provided with a coil holding portion for holding the coil portion, which is formed in a semicircular shape with which the upper portion of the coil portion is fitted, and on which the conveyance driven roller is pivotally supported. Is inserted in between the conveyance driven roller holder and the coil holding portion from the front side or the rear side of the recording apparatus, and the one end of the torsion coil spring is used to insert the torsion coil spring into the frame member. While the conveying driven roller holder is urged from above, the coil portion is fitted to the coil holding portion from below, and the torsion coil spring Can be attached by engaging the spring holding portion, and the coil portion presses the coil holding portion from below by the spring force of the torsion coil spring, so that the central axis direction thereof is the conveyance driven. The coil holding part is held in a state parallel to the central axis direction of the roller.
[0008]
According to the first aspect of the present invention, the torsion coil spring that biases the conveyance driven roller holder is formed in a concave shape into which the upper portion of the coil portion is fitted, and is fitted from below to the coil holding portion that holds the coil portion. By attaching, it is attached to the frame member. Therefore, when the torsion coil spring is attached, there is no need to pass the rotating shaft through the coil portion of the torsion coil spring, and thus the torsion coil spring for biasing the conveyance driven roller holder can be attached more easily and quickly. Is possible.
[0009]
The spring mounting device according to claim 2 of the present application is the spring mounting device according to claim 1, wherein a lower portion of the frame member erected in parallel with a vertical surface is bent toward the front side of the recording device, and the coil holding portion is By being formed in the bent part, it is provided integrally with the frame member.
[0010]
According to the second aspect of the present invention, the lower part of the frame member standing in parallel with the vertical surface is bent toward the front side of the recording apparatus, and the coil holding portion is formed at the bent portion. By being formed, the frame member is provided integrally with the frame member. Therefore, it is not necessary to separately provide the coil holding portion, and the cost can be reduced.
Further, in the invention according to claim 3 of the present application, in claim 2, the coil holding portion is formed so as to protrude upward by cutting out a part of the frame member, and an upper portion of the coil portion is formed. The inner end surfaces of the notched portions of the frame member are located on both sides in the central axis direction of the coil portion in a state of being fitted to the coil holding portion.
[0011]
According to a fourth aspect of the present invention, there is provided a recording apparatus for conveying a recording material at a constant pitch to a recording unit for recording on the recording material, a rotationally driven conveyance driving roller, and a driven rotation in pressure contact with the conveyance driving roller. A transporting driven roller that moves, a transporting driven roller holder that pivotally supports the transporting driven roller, and a frame that is provided with the transporting driven roller holder that includes a plate-like body that is long in the width direction of the recording material. The member and one end urge the conveyance driven roller holder from above, and the other end is latched on a spring latching portion provided on the frame member, so that the conveyance driven roller holder and the conveyance driven roller are 4. A recording apparatus comprising: a torsion coil spring that is urged to rotate in a direction in pressure contact with the conveyance drive roller, wherein the torsion coil spring is added to the spring mounting device according to claim 1. Yo And wherein the attached Te.
[0012]
According to the invention of claim 4 of the present application, in the recording apparatus for recording on the recording material, the torsion coil spring for biasing the conveyance driven roller holder is described in any one of claims 1 to 3. Since it is attached by the spring attachment device, it is possible to obtain the same operational effects as those of the invention described in any one of claims 1 to 3 described above.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Configuration of the main body of the inkjet printer>
Hereinafter, the configuration of an apparatus main body of an inkjet printer as a “recording apparatus” according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is an external perspective view of the main body of the ink jet printer (hereinafter simply referred to as “printer”) 100, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a sectional side view thereof, and FIG. FIG.
[0014]
1 and 2, the printer main body is divided into a plurality of units, and the apparatus main body is configured by combining the plurality of units. In the figure, reference numeral 1 denotes a paper feeding unit as a paper feeding device capable of feeding paper P (see FIG. 3) or roll paper (not shown) as a recording material, and reference numeral 20 denotes an ink jet recording head 24 (see FIG. 3 is a carriage unit including a carriage 22, 60 is a conveyance unit for conveying a recording material, and 80 is an ink system unit for maintaining the inkjet recording head 24. 2 is divided into these four units as shown in FIG. 2, and these four units are combined as shown in FIG. In this embodiment, the carriage unit 20 and the ink system unit 80 are connected to the upper side and the right side (right side in FIG. 4) of the transport unit 60, respectively, and the paper feed unit 1 is connected to the back side of the carriage unit 20. By doing so, the four units are configured to be combined.
[0015]
Next, the paper conveyance path of the printer 100 will be described with reference to FIG. In the following, the left side of FIG. 3 (the rear side of the printer 100) is referred to as “upstream side”, and the right side of FIG. 3 (the front side of the printer 100) is referred to as the downstream side. The printer 100 includes a hopper 6 on the upstream side, and a sheet P as a cut sheet is stacked and stored on the hopper 6 in an inclined posture. The hopper 6 is provided so as to be rotatable in the clockwise and counterclockwise directions of FIG. 3 around a rotation fulcrum (not shown) located at the upper portion, and the lower portion is relative to the paper feed roller 3 by rotating. The pressure contact and separation operation are performed. The hopper 6 includes a movable guide 4 that can slide in the width direction of the paper P (see FIG. 1), and guides the side edge of the accumulated paper P together with the fixed guide 5 (see FIG. 1). Then, the uppermost one of the stacked sheets P is fed out to the downstream side when the hopper 6 presses the sheet feeding roller 3 and the sheet feeding roller 3 rotates in the pressed state. The sheet feed roller 3 has a substantially D shape when viewed from the side, and rotates when the rotation shaft 3a is driven to rotate. The paper feed roller 3 is controlled so that its flat portion faces the paper P during the printing operation (the state shown in FIG. 3), thereby preventing the transport load of the paper P from being generated.
[0016]
Next, a sheet guide 67 as a plate-like body is provided substantially horizontally downstream from the sheet feed roller 3, and the leading edge of the sheet P fed out by the sheet feed roller 3 strikes the sheet guide 67 obliquely. It touches and is guided smoothly downstream. A conveyance driving roller 62 that is rotationally driven and a conveyance driven roller 63 that is in pressure contact with the conveyance driving roller 62 are provided downstream from the paper guide 67, and the sheet P includes the conveyance driving roller 62, the conveyance driven roller 63, and the like. And is conveyed downstream at a constant pitch.
[0017]
The conveyance driven roller 63 is pivotally supported on the downstream side of the conveyance driven roller holder 64, and the conveyance driven roller holder 64 is provided so as to be rotatable in the clockwise and counterclockwise directions in FIG. 3 around the rotation shaft 64a. In addition, a torsion coil spring 70 (see FIG. 7) attached by a spring mounting device described later is urged to rotate in a direction in which the transport driven roller 63 is always in pressure contact with the transport drive roller 62 (clockwise in FIG. 3). Has been. The transport driving roller 62 has a rotation shaft that is long in the main scanning direction. Therefore, in the present embodiment, the transport driving roller 62 and the rotation shaft of the transport driving roller 62 are the same. In the present embodiment, four transport driven roller holders 64 are arranged along the axial direction of the transport drive roller 62, and two transport driven rollers 63 are pivotally supported by one transport driven roller holder 64. ing.
[0018]
Next, in the vicinity of the conveyance driven roller holder 64 located on the most digit side (right front side in FIG. 2), a paper detector 36 comprising a sensor main body 36b and a detector 36a for detecting the passage of the paper P is provided. It is arranged. The detector 36a has a substantially "<" shape when viewed from the side, and is provided so as to be pivotable in the clockwise and counterclockwise directions in FIG. 2 about a pivot shaft 36c near the center thereof. The sensor main body 36b positioned above the detector 36a includes a light emitting portion (not shown) and a light receiving portion (not shown) that receives light from the light emitting portion, and the upper side of the rotation axis 36c of the detector 36a is on the upper side. The rotation operation blocks and passes light from the light emitting portion toward the light receiving portion. Accordingly, as shown in FIG. 3, when the detector 36a is rotated so as to be pushed upward with the passage of the paper P, the upper side of the detector 36a is detached from the sensor main body 36b. Thus, the passage of the paper P is detected.
[0019]
Subsequently, the platen 66 and the inkjet recording head 24 are arranged downstream of the transport driving roller 62 so as to face each other. The platen 66 is long in the main scanning direction (see FIG. 2). In the present embodiment, the platen 66 is made of a metal material, which makes it possible to prevent the generation of static electricity as compared with the case of being made of a resin material. Even at times, the paper P can pass smoothly.
[0020]
The sheet P conveyed under the inkjet recording head 24 by the rotation of the conveyance driving roller 62 is supported from below by the platen 66. The ink jet recording head 24 is provided at the bottom of a carriage 22 on which the ink cartridge 23 is mounted. The carriage 22 reciprocates in the main scanning direction while being guided by a carriage guide shaft 25 extending in the main scanning direction. In this embodiment, the ink cartridge 23 is composed of four cartridges as shown in FIG. 4, that is, four cartridges filled with four colors of ink (black, yellow, cyan, magenta), respectively, Each can be exchanged independently.
[0021]
Next, downstream of the ink jet recording head 24 is a paper discharge portion of the printer 100, and a paper discharge driving roller 65, a paper discharge driven roller 31, and a paper discharge auxiliary roller 32 are disposed. A plurality of paper discharge drive rollers 65 are attached in the axial direction of the paper discharge drive roller shaft 65a that is rotationally driven (see FIG. 4), and the paper discharge driven roller 31 that is pivotally supported by the paper discharge driven roller holder 31a. The paper discharge drive roller 65 is provided so as to be driven and rotated by being pressed lightly. Accordingly, the paper P printed by the ink jet recording head 24 is rotated in a state where the paper P is nipped by the paper discharge driving roller 65 and the paper discharge driven roller 31, so that the paper discharge direction (see FIG. (In the direction of arrow 3). The paper discharge auxiliary roller 32 pivotally supported by the paper discharge auxiliary roller holder 32a is provided slightly upstream of the paper discharge driven roller 31. The paper discharge roller 32 presses the paper P slightly downward from the platen 66. Thus, the distance between the paper P and the inkjet recording head 24 is restricted.
[0022]
Here, the hopper 6, the movable guide 4, the fixed guide 5, and the paper feed roller 3 described above are provided in the paper feed unit 1 shown in FIGS. As shown in FIG. 2, the sheet feeding unit 1 is arranged by a sheet feeding unit frame 2 having a substantially columnar mounting portion right 2a and a mounting portion left 2b, which are erected on the left and right sides with a hopper 6 interposed therebetween. A base is configured, and the hopper 6, the rotation shaft 3a of the paper feed roller 3, and the like are provided in the paper feed unit frame 2. The paper feed unit 1 is connected to the rear side of the carriage unit 20 at the upper part of the attachment part 2a and the attachment part 2b.
[0023]
Next, the paper guide 67, the transport drive roller 62, the transport driven roller holder 64, and the paper discharge drive roller shaft 65a are provided in the transport unit 60 shown in FIGS. As shown in FIG. 2, the transport unit 60 includes a transport unit frame 61 having a substantially U-shape in plan view. The transport unit frame 61 includes a power supply unit 68 that is a power supply unit of the printer 100 on the rear side. The drive roller shaft 65a is pivotally supported by the conveyance drive roller 62 in the middle of the main body, the platen 66 is provided at the upper front portion, and the conveyance driven roller holder 64 is provided at the upper middle portion. Further, the conveyance unit 60 has a drive serving as a common drive source for the paper feed roller 3, the conveyance drive roller 62, the paper discharge drive roller 65, a pump device 82 to be described later, and the blade unit 84 at the lower left side. A motor 69 (see FIG. 4) is provided. Power transmission from the drive motor 69 to the paper feed roller 3, the conveyance drive roller 64, and the paper discharge drive roller 65 is performed by a power transmission device 50, which will be described later, provided on the left side surface of the conveyance unit 60. The power transmission to the pump device 82 and the blade unit 84 provided on the right side of the power transmission device via the paper discharge drive roller shaft 65a is performed by a power transmission device (gear device) (not shown) provided at the right end of the paper discharge drive roller shaft 65a. ).
[0024]
An ink system unit 80 connected to the right side of the transport unit 60 and serving as maintenance means for the ink jet recording head 24 is a frame serving as a unit base connected to the right side of the transport unit frame 61 as shown in FIG. 81, and the frame 81 is provided with a cap device 83, a pump device 82, and a blade unit 84. In the cap device 83, the carriage 22 is at the home position (a in FIG. ₁ The ink jet recording head 24 is capped to move the nozzle surface (not shown) when it moves into the region), and the pump device 82 supplies negative pressure to the cap device 83 in the capped state. Ink is sucked from the nozzle opening. The blade unit 84 can move between a position crossing the reciprocating area of the carriage 22 and a position retracting from the reciprocating area. The blade unit 84 moves to a position crossing the reciprocating area of the carriage 22, and the carriage 22 prints. Region (a in FIG. ₀ Area) to home position (a in FIG. 4) ₁ Cleaning is performed by wiping the nozzle surface (not shown) of the inkjet recording head 24 by moving into the region) or by moving in the opposite direction.
[0025]
The carriage guide shaft 25 and the paper detector 36 are provided in the carriage unit 20. As shown in FIG. 2, the carriage unit 20 includes a main frame 21a, and a side frame right 21b and a side frame left 21c erected on both sides of the main frame 21a. 25 is supported.
[0026]
Further, as shown in FIG. 4, the carriage unit 20 includes a carriage motor 27 on the rear left side of the unit, and a drive pulley 28 is attached to the carriage motor 27. A driven pulley 29 is provided on the right side of the unit. A carriage belt 26 is suspended between the driving pulley 28 and the driven pulley 29, and a part of the carriage belt 26 is fixed to the carriage 22. . Therefore, the carriage 22 reciprocates in the main scanning direction (left-right direction in FIG. 4) by the rotation of the carriage motor 27.
[0027]
In FIG. 2, the paper discharge frame 30 is attached to the carriage unit 20 side. However, the paper discharge frame 30 can be attached to the carriage unit 20 side or the transport unit 60 side. It is also possible to belong to the side.
The above is the configuration of the apparatus main body of the printer 100, and the printer 100 is movable when the four units are combined and connected.
[0028]
<Configuration of spring mounting device>
Next, with reference to FIG. 5 to FIG. 9, a mounting device for the torsion coil spring 70 that biases the above-mentioned transport driven roller holder 64 will be described in detail. Here, FIGS. 5 to 8 are partially enlarged perspective views of the transport unit 60, FIGS. 5 and 7 are views taken along the arrow x in FIG. 2, and FIGS. 6 and 8 are views taken along the arrow y in FIG. The attachment procedure of the torsion coil spring 70 will be described. 9A and 9B are side sectional views (partially enlarged views) of the transport unit frame 61. FIG. Here, as described above, the printer 100 according to the present embodiment includes the four conveyance driven roller holders 64 in the axial direction of the conveyance driving roller 62. In the following description, the printer 100 is closest to the 80th digit side (left side in FIG. 4). The torsion coil spring 70 that urges the conveyance driven roller holder 64 provided will be described as an example. The conveyance driven roller holder 64 provided on the most 80th digit side is provided with a paper guide portion 71 for guiding the side edge portion of the paper P to the downstream side, as shown in FIG. The paper guide portion 71 has substantially the same shape as the downstream portion of the transport driven roller holder 64 in a side view (see FIG. 3).
[0029]
First, as shown in FIG. 5, in the conveyance unit frame 61 erected in parallel with the vertical plane, the portion to which the conveyance driven roller holder 64 is attached is downstream (right side in FIG. 9) as indicated by reference numeral 61a. The conveyance driven roller holder 64 is pivotally supported by the bent portion 61a, and the coil portion 70a of the torsion coil spring 70 is held.
[0030]
More specifically, as shown in FIG. 9, the torsion coil spring 70 includes a coil portion 70a, a frame hooking end 70b extending upward from the coil portion 70a and having a substantially “<” shape in side view, and the frame hooking. As a “spring latching portion” formed on the transport unit frame 61 by the frame latching end 70 b, which is formed with a holder engagement end 70 c that forms a substantially “<” shape in side view slightly more gently than the latching end 60 b. It hooks on the hook-shaped hook portion 72 (see FIG. 6) and engages with the upper surface of the downstream end portion (right end portion in FIG. 9) of the transport driven roller holder 64 by the holder engaging end 70c. The holder 64 is urged to rotate in a direction in which the conveyance driven roller 63 is pressed against the conveyance driving roller 62 (clockwise in FIG. 9).
[0031]
On the other hand, the bent portion 61a is formed with a coil holding portion 61b having a semicircular shape in a side view, which is convex upward as shown in FIG. 9, and the coil holding portion 61b has a shape shown in FIG. As shown in B), the coil portion 70a of the torsion coil spring 70 is fitted from below, whereby the torsion coil spring 70 is held. Further, a slit 61d is formed between the hook-shaped hook portion 72 and the coil holding portion 61b as shown in FIGS. 5 and 6, and the coil portion 70a is held by the coil holding portion 61b by the slit 61d. In this state, the frame hooking end 70 b can be hooked to the hook-shaped hook portion 72. In addition, concave portions 61c and 61c are formed in the bent portion 61a, and the rotating shafts 64a and 64a formed on the transport driven roller holder 64 are pivotally supported by the concave portions 61c and 61c. .
[0032]
Hereinafter, a procedure for attaching the torsion coil spring 70 will be described with reference to FIGS. 5 to 8 and 9. First, as shown in FIGS. 5, 6, and 9A, after the conveyance driven roller holder 64 is attached to the bent portion 61a, the conveyance unit frame 61 is moved forward from the rear side (downstream side: left side in FIG. 9). The torsion coil spring 70 is inserted between the conveyance driven roller holder 64 and the bent portion 61a toward the side, and the downstream end (right end in FIG. 9) of the conveyance driven roller holder 64 is moved upward by the holder engaging end 70c. The coil portion 70a is fitted to the coil holding portion 61b from below while being urged from below. Next, the frame latching end 70b of the torsion coil spring 70 is latched to the hook-shaped hook portion 72, and the torsion coil spring 70 is attached thereto. The state where the torsion coil spring 70 is attached is the state shown in FIGS. 7, 8, and 9B.
[0033]
That is, the torsion coil spring 70 that biases the conveyance driven roller holder 64 is attached to the conveyance unit frame 61 by fitting from below to a coil holding portion 61b having a concave shape into which the upper portion of the coil portion 70a is fitted. . Therefore, to attach the torsion coil spring 70, it is only necessary to insert the torsion coil spring 70 from the rear side of the transport unit frame 61 and hook it on the hook-shaped hook portion 72, and to insert the rotating shaft into the coil portion 70a. Thus, the torsion coil spring 70 can be attached very simply and quickly.
[0034]
In the present embodiment, the coil holding portion 61b that holds the coil portion 70a is provided integrally with the frame member 61. Therefore, it is not necessary to provide the coil holding portion 61b as a separate member, and the cost can be reduced. The coil holding part 61b can be disposed. In the present embodiment, the torsion coil spring 70 is inserted from the rear side of the transport unit frame 61, but may be configured to be inserted from the front side of the transport unit frame 61. Furthermore, the coil holding portion 61b that holds the coil portion 70a has a semicircular shape in a side view in the present embodiment, but is not limited to this shape, and is held so that the coil portion 70a is not easily detached. Any shape can be used. In this case, the coil portion 70a is pressed against the coil holding portion 61b from below by using the spring force of the torsion coil spring 70 as in the present embodiment. By using means, the coil part 70a may be fitted so as not to fall downward from the coil holding part 61b.
[0035]
【The invention's effect】
As described above, according to the present invention, the torsion coil spring that urges the conveyance driven roller holder has a concave shape into which the upper portion of the coil portion is fitted, and the coil holding portion that holds the coil portion from below. It is attached to the frame member by fitting. Therefore, when attaching the torsion coil spring, there is no need to insert the rotating shaft into the coil portion of the torsion coil spring, and thereby the torsion coil spring for biasing the conveyance driven roller holder can be attached more easily and quickly. Is possible.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an apparatus main body of an ink jet printer according to the present invention.
FIG. 2 is an exploded perspective view of an apparatus main body of an ink jet printer according to the present invention.
FIG. 3 is a side sectional view of the ink jet printer according to the present invention.
FIG. 4 is a front view of the main body of the ink jet printer according to the present invention.
FIG. 5 is a partially enlarged perspective view (as viewed in the direction of an arrow x in FIG. 2) of a transport unit constituting the ink jet printer according to the present invention.
6 is a partially enlarged perspective view (a view taken in the direction of an arrow y in FIG. 2) of a transport unit constituting the ink jet printer according to the present invention.
FIG. 7 is a partially enlarged perspective view (as viewed in the direction of an arrow x in FIG. 2) of a transport unit constituting the ink jet printer according to the present invention.
FIG. 8 is a partially enlarged perspective view (a view taken in the direction of arrow y in FIG. 2) of the transport unit constituting the ink jet printer according to the present invention.
FIG. 9 is a side sectional view (partially enlarged view) of a transport unit frame constituting the ink jet printer according to the present invention.
FIG. 10 is a perspective view of a transport driven roller holder showing a spring mounting device according to the prior art.
[Explanation of symbols]
1 Paper feed unit
20 Carriage unit
22 Carriage
24 Inkjet recording head
60 transport unit
61 Transport unit frame
62 Conveyance drive roller
63 Conveyor driven roller
64 Conveyance driven roller holder
70 Torsion coil spring
72 hook hook
100 Inkjet printer
P Printing paper

Claims (4)

A conveyance drive roller that is rotationally driven to convey the recording material at a constant pitch to a recording unit that records on the recording material;
A transport driven roller that is driven to rotate by being pressed against the transport drive roller;
A conveyance driven roller holder rotatably supported to pivotally support the conveyance driven roller;
A frame member provided with the conveyance driven roller holder, which is made of a plate-like body that is long in the width direction of the recording material;
One end urges the transport driven roller holder from above, and the other end latches on a spring latching portion provided on the frame member, so that the transport driven roller holder is transported by the transport driven roller. A torsion coil spring that is urged to rotate in a direction in which the torsion coil is pressed against the frame member, wherein the torsion coil spring is attached to the frame member.
In a side view of the recording material conveyance path, the concave shape is formed above the conveyance driven roller holder and forms an opening for receiving the upper portion of the coil portion of the torsion coil spring on the side facing the conveyance driven roller holder. Comprises a coil holding part for holding the coil part, forming a semicircular shape into which the upper part of the coil part is fitted,
In the state in which the conveyance driven roller holder on which the conveyance driven roller is pivotally supported is provided on the frame member, the torsion coil spring is moved from the front side or the rear side of the recording apparatus to the conveyance driven roller holder and the coil holding portion. The coil portion is fitted to the coil holding portion from below while the conveyance driven roller holder is urged from above by one end of the torsion coil spring, and the other end of the torsion coil spring is connected to the spring. It can be attached by hooking to the hook,
When the coil portion presses the coil holding portion from below by the spring force of the torsion coil spring, the coil holding portion is held by the coil holding portion in a state in which the central axis direction is parallel to the central axis direction of the transport driven roller. The
A spring mounting device characterized by that. In Claim 1, the lower part of the frame member erected in parallel to the vertical surface is bent toward the front side of the recording apparatus,
The spring mounting apparatus, wherein the coil holding portion is formed integrally with the frame member by being formed in the bent portion. In Claim 2, the said coil holding part is formed so that it may notch a part of said frame member, and it may become convex upwards,
In the state where the upper part of the coil part is fitted to the coil holding part, the inner end face of the cutout part of the frame member is located on both sides in the central axis direction of the coil part.
A spring mounting device characterized by that. A conveyance drive roller that is rotationally driven to convey the recording material at a constant pitch to a recording unit that records on the recording material;
A transport driven roller that is driven to rotate by being pressed against the transport drive roller;
A conveyance driven roller holder rotatably provided to pivotally support the conveyance driven roller, and a frame member provided with the conveyance driven roller holder, which is made of a plate-like body long in the width direction of the recording material;
One end urges the transport driven roller holder from above, and the other end latches on a spring latching portion provided on the frame member, so that the transport driven roller holder is transported by the transport driven roller. A torsion coil spring that is urged to rotate in a direction in pressure contact with the recording device,
A recording apparatus, wherein the torsion coil spring is attached by the spring attachment device according to any one of claims 1 to 3.

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