JP6020117B2 - Developing device and image forming apparatus - Google Patents

Description

  The present invention relates to a developing device and an image forming apparatus.

  One end side film member is provided at one end of the agitator of the toner storage unit that supplies toner to the developer carrying member by the rotationally driven agitator, and the other end side film member is provided at the other end. A developing device is known in which a film member is longer than the other end film member, and an auxiliary film member shorter than the one end side film member overlaps with the one end side film member (Patent Document 1). .

  The toner scooping blade provided in the toner storage container is composed of two flexible sheets, and the two flexible sheets are the end fixed to the blade support member and the other end abutting against the inner wall of the toner storage container There is also known a toner supply device in which a spacer is interposed between the two flexible sheets and a gap is formed between the two flexible sheets (Patent Document 2).

JP 2002-268343 A JP 2011-081086 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a developing device and an image forming apparatus that can reliably agitate and convey the contained toner and prevent an increase in rubbing noise.

In order to solve the above problem, the developing device according to claim 1,
A housing provided with a delivery port for containing the toner and delivering the toner inside;
A rotating shaft pivotally supported so as to be rotationally driven in the housing;
A film member that conveys the toner contained in the outer housing while stirring along the inner wall of the housing and sends out the toner from the outlet.
The base end portion of the film member is fixed to the rotating shaft in a state where the two film members are overlapped, and the thickness of the first film member disposed on the downstream side in the rotational direction is t1, and disposed on the upstream side in the rotational direction. the thickness of the second film member is taken as t2 was, t1> t2 der is, radial direction of the length of the first film member is shorter than the minimum radius of the length of the inner wall of the housing, The length in the rotational radius direction of the second film member is set to be longer than the length of the maximum radius of the inner wall of the housing .
It is characterized by that.

According to a second aspect of the present invention, in the developing device according to the first aspect,
The first film member is formed at least in the width direction length of the delivery port, the width of the first film member in the direction intersecting the rotation direction is W1, and the width of the second film member is W2. When W1 <W2,
It is characterized by that.

In order to solve the above problem, an image forming apparatus according to claim 3 ,
A photoreceptor on which an electrostatic latent image is formed;
Charging means for charging the photoreceptor;
Latent image forming means for forming a latent image by exposing the photoreceptor charged by the charging means;
The developing device according to claim 1 or 2 , which develops the latent image formed by the latent image forming unit.
Transfer means for transferring an image obtained by development of the developing device to a recording medium;
Fixing means for fixing the image transferred to the recording medium by the transfer means,
It is characterized by that.

According to the first and third aspects of the present invention, as compared with the case where the present configuration is not provided, even if the amount of stored toner increases, the toner can be reliably stirred and conveyed.
According to the invention described in claim 2, compared with the case not having the present structure, while suppressing the rubbing noise, the stored toner can be smoothly supplied to the developing roller.

1 is a schematic cross-sectional view illustrating an internal configuration of an image forming apparatus 1 according to an embodiment. 2 is a schematic cross-sectional view of a photoconductor unit 30 and a developing device 40 that constitute an image forming unit of the image forming apparatus 1. FIG. (A) is a perspective view of the agitator 43, and (b) is a longitudinal sectional view of the agitator 43. (A) is a schematic cross-sectional view of the main part of the developing device 40 excluding the developing roller 42, and (b) is a schematic diagram showing the relationship in the developing device width direction between the delivery port 41c and the film members 45 and 46. . (A) is a perspective view of agitator 43A with which developing device 40A concerning a 2nd embodiment is provided, (b) is a longitudinal section of agitator 43A. (A) is a schematic cross-sectional view of the main part of the developing device 40A according to the second embodiment, excluding the developing roller 42, and (b) shows the relationship in the developing device width direction between the delivery port 41c and the film members 45A and 46A. It is the shown schematic diagram. FIG. 4 is a schematic cross-sectional view of a main part of a developing device 100 of a comparative example, excluding the developing roller 42;

Next, the present invention will be described in more detail with reference to the drawings with reference to the drawings. However, the present invention is not limited to these embodiments.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.

“First Embodiment”
(1) Overall Configuration and Operation of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing the internal configuration of the image forming apparatus 1 according to this embodiment.
The overall configuration and operation of the image forming apparatus will be described below with reference to the drawings.

  The image forming apparatus 1 includes a control device 10, a paper feeding device 20, a photosensitive unit 30, a developing device 40, an exposure device 50, a transfer device 60, and a fixing device 70. On the upper surface (Z direction) of the image forming apparatus 1, a discharge tray 1a for discharging and storing a sheet on which an image is recorded is formed.

The control device 10 includes a controller 11 that controls the operation of the image forming apparatus 1, an image processing unit 12 that is controlled by the controller 11, a power supply device 13, and the like.
The image processing unit 12 converts print information input from an external information transmission device (for example, a personal computer) into image information for forming a latent image, and outputs a drive signal to the exposure device 50 at a preset timing. To do.
The power supply device 13 applies a bias voltage to the charging roller 32, the developing roller 42, the transfer roller 61, and the like which will be described later.

  A paper feeding device 20 is provided at the bottom of the image forming apparatus 1. The sheet feeding device 20 includes a sheet stacking plate 21, and a plurality of sheets P as recording media are stacked on the upper surface of the sheet stacking plate 21. The paper P loaded on the paper stacking plate 21 and whose position in the width direction is determined by a regulating plate (not shown) is pulled out one by one from the top by the paper pulling unit 22 (−X direction), and then registered. It is conveyed to the nip portion of the pair 23.

  The photoreceptor unit 30 includes a photoreceptor drum 31 that is provided above the sheet feeding device 20 and is driven to rotate. A charging roller 32, a developing device 40, a transfer roller 61, and a cleaning blade 34 are arranged along the rotation direction of the photosensitive drum 31. A cleaning roller 33 for cleaning the surface of the charging roller 32 is disposed opposite to and in contact with the charging roller 32.

  The developing device 40 includes a developing housing 41 in which toner is accommodated. A developing roller 42 having a magnet roller therein is disposed in the developing housing 41 so as to face the photosensitive drum 31. On the back side of the developing roller 42, an agitator 43 for agitating and conveying the toner contained in the developing housing 41 to the developing roller 42 side is disposed. A layer regulating blade 48 that regulates the layer thickness of the toner supplied via the delivery port 41 c of the developing housing 41 is disposed in contact with the developing roller 42.

In the developing device 40, a toner storage chamber 49 is provided in the upper portion of the development housing 41, and when the amount of toner in the development housing 41 falls below a predetermined amount, toner is supplied from the toner storage chamber 49 to the development housing 41.
The photosensitive unit 30 and the developing device 40 are integrated as an exchange unit, and are detachably attached to the image forming apparatus 1.

  The exposure apparatus 50 includes laser beam emitting means (not shown) used as a light source, and a rotating polygon mirror (polygon mirror) 55 that deflects and reflects the laser beam LB from the laser beam emitting means, and image data to be formed. The surface of the photosensitive drum 31 is scanned with the laser beam LB modulated according to the above.

  The surface of the rotating photosensitive drum 31 is charged by the charging roller 32, and an electrostatic latent image is formed by the laser beam LB emitted from the exposure device 50. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42.

  The transfer device 60 includes a transfer roller 61 that forms a nip with the photosensitive drum 31, and a paper conveyance guide 62. A transfer voltage is applied to the transfer roller 61 from the power supply device 13 controlled by the controller 11, and the toner image on the photosensitive drum 31 is transferred to the paper P passing between the photosensitive drum 31 and the transfer roller 61.

  Residual toner on the surface of the photosensitive drum 31 is removed by the cleaning blade 34 and collected in the housing that supports the photosensitive drum 31. Thereafter, the surface of the photosensitive drum 31 is recharged by the charging roller 32. Residue that cannot be completely removed by the cleaning blade 34 and adheres to the charging roller 32 is captured and accumulated on the surface of the cleaning roller 33 that rotates in contact with the charging roller 32.

The fixing device 70 includes a pair of fixing rollers 71 and 72, and a fixing region is formed by a pressure contact region between the pair of fixing rollers 71 and 72.
The sheet P on which the toner image is transferred by the transfer device 60 is conveyed to the fixing device 70 via the sheet conveyance guide 62 in a state where the toner image is not fixed. The toner image is fixed on the sheet P conveyed to the fixing device 70 by the action of pressure bonding and heating by a pair of fixing rollers 71 and 72. The sheet P on which the fixed toner image is formed is guided by the conveyance guides 73a and 73b and is discharged from the discharge roller pair 74 to the discharge tray 1b on the upper surface of the image forming apparatus 1.

(2) Configuration of Developing Device FIG. 2 is a schematic cross-sectional view of the photosensitive unit 30 and the developing device 40 that constitute the image forming unit of the image forming apparatus 1 according to the present embodiment. Hereinafter, the configuration of the developing device 40 will be described with reference to the drawings.

The photoconductor unit 30 and the developing device 40 are configured as a single unit and are detachable from the image forming apparatus 1.
The developing device 40 includes a developing housing 41 that stores toner (Tn) as an example of a developer, a developing roller 42 that holds the toner and develops the electrostatic latent image on the surface of the photosensitive drum 31 with toner, and the inside of the developing housing 41. An agitator 43 as an agitating and conveying member that supplies toner to the developing roller 42 while agitating the toner contained in the toner, and a layer regulating blade that makes the toner on the surface of the developing roller 42 conveyed to the developing region thin and uniformizes the charge 48, and a toner storage chamber 49 that stores toner supplied into the developing housing 41.

(2.1) Development Housing The development housing 41 includes a development unit 41a and a toner storage unit 41b, and the development unit 41a and the toner storage unit 41b communicate with each other through a delivery port 41c.
One end of the developing unit 41a opens to face the photosensitive drum 31, and a developing roller 42 is disposed in the opening.
An agitator 43 is disposed in the toner storage portion 41b. The agitator 43 is configured by fixing a film member to a metal shaft, and agitates the toner in the toner accommodating portion 41b so as to have fluidity, and the toner with respect to the developing roller 42 via the delivery port 41c. Is rotated in the direction of the arrow in FIG.

(2.2) Developing Roller The developing roller 42 is a cylindrical member having a circular cross section, and is rotatably supported in the developing portion 41a of the developing housing 41 so as to hold toner and transport it to the photosensitive drum 31. Then, a power source (not shown) for applying the developing bias is connected.
Inside the developing roller 42, there is provided a magnet roller 42a that is fixed so as not to rotate and in which a plurality of magnetic poles are alternately arranged, and rotates around the magnet roller 42a in one direction (see an arrow in FIG. 2). A non-magnetic cylindrical developing sleeve 42b is provided.
The developing sleeve 42b is subjected to alumite treatment after aluminum is used as a base material and a blast treatment for forming a substantially spherical dimple is performed as a surface treatment.

(2.3) Layer Restricting Blade As shown in FIG. 2, a layer restricting blade 48 that restricts the toner layer thickness is disposed in contact with the developing roller 42. The layer regulating blade 48 includes a holding plate 48a having one end fixed to the developing housing 41, and a rubber member 48b attached to the other end of the holding plate 48a. For example, silicon rubber, urethane rubber, or the like is used as the rubber member 48b.

(2.4) Agitator FIG. 3A is a perspective view of an agitator 43 as agitating and conveying means provided in the developing device 40 according to this embodiment, FIG. 3B is a longitudinal sectional view of the agitator 43, and FIG. ) Is a schematic cross-sectional view of the main part of the developing device 40 excluding the developing roller 42, and FIG. 4B is a schematic diagram showing the relationship in the developing device width direction between the delivery port 41c and the film members 45 and 46. .

  The agitator 43 includes a rotation shaft 44, first and second film members 45 and 46 that stir and convey the toner in the toner storage portion 41 b while rotating, and shafts formed on both ends of the rotation shaft 44. 47, and is rotatably supported on both side walls of the toner accommodating portion 41b of the developing housing 41.

  The rotating shaft 44 has a sticking surface 44a formed in the longitudinal direction for fixing the first film member 45 and the second film member 46 by bending a metal plate, for example. In addition, holder portions 44 b and 44 b for fixing the shaft portions 47 and 47 are formed on both side ends of the rotating shaft 44.

As for the 1st film member 45 and the 2nd film member 46, a base end part adheres to the sticking surface 44a of the rotating shaft 44 via a double-sided tape, for example.
Specifically, the second film member 46 is affixed to the affixing surface 44a of the rotating shaft 44 via a double-sided tape (AD), and then the first film member 45 is affixed to the proximal end. The portion is stuck on the second film member 46. As a result, in the agitator 43, the first film member 45 is disposed on the downstream side and the second film member 46 is disposed on the upstream side with respect to the rotation direction of the rotation shaft 44 (see the arrow in FIG. 4A). Will be.

When the thickness of the first film member 45 disposed on the downstream side in the rotation direction is t1, and the thickness of the second film member 46 disposed on the upstream side in the rotation direction is t2, the thickness of each film member is t1> t2.
Specifically, the thickness t1 of the first film member is 75 μm to 250 μm, preferably 100 μm to 150 μm, and the thickness t2 of the second film member 46 is 30 to 70 μm, preferably 40 to 60 μm.

When the thickness of the first film member 45 exceeds 250 μm, the rotational resistance when rotating in the toner stored in the toner accommodating portion 41 b increases, and when the thickness of the first film member 45 is 75 μm or less. It is not preferable that the toner is deformed by the powder resistance of the agitated toner.
If the thickness of the second film member 46 is 30 μm or less, the toner conveyance performance is inferior. On the other hand, if the thickness exceeds 80 μm, the rubbing noise with the inner wall of the toner containing portion 41b increases.

The length of the first film member 45 in the rotational radius direction is shorter than the length of the minimum radius of the inner wall of the toner accommodating portion 41b, and the length of the second film member 46 in the rotational radius direction is the length of the toner accommodating portion 41b. It is set longer than the maximum radius of the inner wall.
Specifically, the length of the first film member 45 in the rotational radius direction is set to be shorter than the length of the minimum radius of the inner wall of the toner container 41b, and the inner wall surface of the toner container 41b and the first film. The gap G with the tip of the member 45 is 1 mm or less, preferably 0.5 mm or less. When the gap G exceeds 1 mm, the toner stirring / conveying ability decreases.
The length of the second film member 46 in the rotational radius direction is set to be 2 mm, preferably 0.5 mm to 1 mm longer than the length of the maximum radius of the inner wall of the toner accommodating portion 41b. When the length in the rotational radius direction of the second film member 46 is set to be longer than 2 mm than the length of the maximum radius of the inner wall of the toner containing portion 41b, the second film member 46 is rubbed with the inner wall of the toner containing portion 41b. The amount of sag is increased, the toner transportability is inferior, and the rubbing noise is increased.

The first film member 45 is formed with at least the width direction length of the delivery port 41c of the developing housing 41, and the width of each film member in the axial direction of the rotation shaft 44 is the width of the first film member 45, W1. When the width of the second film member 46 is W2, W1 <W2.
Specifically, as shown in FIG. 4B, the first film member 45 is formed to have a width of 1 mm to 2 mm wider at both ends than the width of the delivery port 41c of the development housing 41, and The toner in the both end regions is agitated to suppress a decrease in fluidity.
The second film member 46 is formed wider than the first film member 45, and supplies the toner in the toner storage portion 41b to the developing portion 41a through the delivery port 41c without leaving any excess.

  Both the first film member 45 and the second film member 46 are made of elastic members, and preferably a biaxially stretched film made of polyester or the like, for example, a PET (polyethylene terephthalate) sheet is suitable. is there.

(3) Actions / Effects Next, actions / effects of the developing device 40 according to the present embodiment will be described. First, problems of the developing device 100 of the comparative example will be described.
In the following description, common components in the respective developing devices are denoted by the same reference numerals, and detailed description thereof is omitted.

"Comparative example"
FIG. 7 is a schematic cross-sectional view of an essential part of a developing device 100 of a comparative example, excluding the developing roller 42.
The photoreceptor unit 30 includes a photoreceptor drum 31. The surface of the rotating photoreceptor drum 31 is charged by a charging roller 32, and an electrostatic latent image is formed by a laser beam LB emitted from the exposure device 50. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42.
The developing device 100 includes an agitator 110 therein, a toner accommodating portion 41b that conveys toner stirred by the agitator 110 toward the developing roller 42, and a toner accommodating chamber that accommodates toner supplied to the toner accommodating portion 41b. 49.
In the agitator 110, one end of the film member is fixed to the rotation shaft, and the other end is rotationally driven while rubbing against the inner wall surface of the toner containing portion 41b to stir and convey the toner in the toner containing portion 41b.

The toner in the toner container 41b is consumed by forming a toner image. When the amount of toner in the toner container 41b falls below a predetermined amount, new toner is supplied from the toner container 49 into the toner container 41b. .
On the other hand, the amount of toner consumed in the toner container 41b increases or decreases depending on the image density of the image formed as a toner image. When a large amount of images having a low image density is continuously formed, the toner in the toner container 41b is increased. In the state where the consumption of toner is small, the toner supplied from the toner storage chamber 49 is accumulated in the toner storage portion 41b, and the toner storage amount in the toner storage portion 41b is increased.

When the agitator 110 rotates while the amount of toner stored in the toner container 41b is increased, the film member of the agitator 110 is subjected to a large load by the stored toner, and the film member is wound around the rotation shaft and stirred and conveyed. There was a risk of being disturbed.
In particular, when the image forming apparatus 1 is used in a high-temperature and high-humidity environment, the toner absorbs moisture and the rotational load received by the agitator 110 tends to increase.

When the thickness of the film member is increased, the agitation / conveyance of the stored toner is improved, but there is a problem that the rubbing noise with the inner wall of the toner accommodating portion 41b increases.
In addition, there is a problem in that the tip of the film member that rotates while contacting the inner wall of the toner containing portion 41b jumps at the opening of the delivery port 41c, and the toner blows out from the gap between the developing portion 41a and the developing roller 42 (FIG. (See middle arrow 4).

"This embodiment"
In the toner accommodating portion 41b of the developing device 40 according to the present embodiment, the base end portion is fixed to the rotating shaft 44 in a state where the first film member 45 and the second film member 46 are overlaid. Has been. Then, when the agitator 43 rotates in a state where the toner storage amount in the toner storage portion 41b is increased, the toner stored by the thick first film member 45 disposed on the downstream side in the rotation direction is stirred and stirred. Then, the fluidized toner is conveyed by the second film member 46 having a small thickness.

Since the length of the first film member 45 in the rotational radius direction is set to be shorter than the minimum radius of the inner wall of the toner containing portion 41b, the first film member 45 does not rub against the inner wall of the toner containing portion 41b. The rubbing noise is suppressed while ensuring agitation.
In addition, the leading end of the first film member 45 does not jump at the opening of the delivery port 41c, and toner blowing out from the gap between the developing unit 41a and the developing roller 42 can be suppressed.
Since the length of the second film member 46 in the rotational radius direction is set to be longer than the length of the maximum radius of the inner wall of the toner accommodating portion 41b, the second film member 46 is agitated by the first film member 45 to impart fluidity. The toner is transported without leaving the toner while contacting the inner wall of the toner container 41b.

The first film member 45 is formed to have a width of 1 mm to 2 mm wider at both ends than the width of the delivery port 41c of the development housing 41, and suppresses a decrease in fluidity due to toner agitation in both side end regions of the delivery port 41c. be able to.
The second film member 46 is formed wider than the first film member 45, and can supply the toner in the toner storage portion 41b to the developing portion 41a through the delivery port 41c without leaving any excess.

“Second Embodiment”
The basic configuration of the developing device 40A of the present embodiment is the same as that of the developing device 40 of the first embodiment, and the thickness of the first film member 45A disposed on the downstream side in the rotation direction of the agitator 43A as the agitating and conveying means. t1, when the thickness of the second film member 46A disposed on the upstream side in the rotation direction is t2, the thickness of each film member is different from that of the first embodiment in that t1 <t2. .
Hereinafter, the developing device 40A of the present embodiment will be described with reference to the drawings. However, the same components as those of the developing device 40 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. .

(1) Configuration of Agitator FIG. 5A is a perspective view of an agitator 43A as an agitating and conveying means provided in the developing device 40A according to this embodiment, FIG. 5B is a longitudinal sectional view of the agitator 43A, and FIG. ) Is a schematic cross-sectional view of the main part of the developing device 40A, excluding the developing roller 42, and FIG. 6B is a schematic diagram showing the relationship in the developing device width direction between the delivery port 41c and the film members 45A and 46A. .
The agitator 43A includes a rotation shaft 44, first and second film members 45A and 46A that stir and convey the toner in the toner container 41b while rotating, and shafts formed on both ends of the rotation shaft 44. 47, and is rotatably supported on both side walls of the toner accommodating portion 41b of the developing housing 41.

  The first film member 45 </ b> A and the second film member 46 </ b> A have base ends fixed to the application surface 44 a of the rotation shaft 44 via, for example, a double-sided tape (AD), and with respect to the rotation direction of the rotation shaft 44. The first film member 45A is disposed on the downstream side, and the second film member 46A is disposed on the upstream side.

When the thickness of the first film member 45A disposed on the downstream side in the rotational direction is t1, and the thickness of the second film member 46A disposed on the upstream side in the rotational direction is t2, the thickness of each film member is t1 <t2.
Specifically, the thickness t1 of the first film member 45A is in the range of 30 to 70 μm, preferably 40 to 60 μm, and the thickness t2 of the second film member 46A is in the range of 75 μm to 250 μm, preferably 100 μm to 150 μm. It is.

The length in the rotational radius direction of the first film member 45A is longer than the length of the maximum radius of the inner wall of the toner accommodating portion 41b, and the length in the rotational radius direction of the second film member 46A is the length of the toner accommodating portion 41b. It is set shorter than the minimum radius of the inner wall.
Specifically, the length of the first film member 45A in the rotational radius direction is set to be 2 mm, preferably 0.5 mm to 1 mm longer than the length of the maximum radius of the inner wall of the toner containing portion 41b. The length in the rotational radius direction of the second film member 46A is set to be shorter than the length of the minimum radius of the inner wall of the toner storage portion 41b, and the inner wall surface of the toner storage portion 41b and the tip of the second film member 46A. The gap G is 1 mm or less, preferably 0.5 mm or less.

The first film member 45 </ b> A is formed at least in the width direction length of the delivery port 41 c of the developing housing 41, and the second film member 46 </ b> A is disposed on both ends in the axial direction of the rotation shaft 44.
Specifically, as shown in FIG. 6B, the first film member 45A is formed to have a width of 1 mm to 2 mm wider at both ends than the width of the delivery port 41c of the developing housing 41, and the toner accommodating portion 41b. The toner inside is supplied to the developing unit 41a through the delivery port 41c without leaving any excess.
The second film members 46 </ b> A and 46 </ b> A are formed with a width that at least overlaps with the opening of the delivery port 41 c of the developing housing 41 at both ends in the axial direction of the rotation shaft 44. The toner in the both end regions of the delivery port 41c is agitated to suppress a decrease in fluidity.

(2) Action / Effect The developing device 40A according to the present embodiment is a thick second film member 46A disposed on the upstream side in the rotational direction, and the first thin film disposed on the downstream side in the rotational direction. It rotates while pushing the member 45A from the back.
Therefore, even when the first film member 45A is subjected to a large load by the stored toner in a state where the toner storage amount in the toner storage portion 41b is increased, the first film member 45A is not rotated. It is possible to suppress the trouble that the wrapping around 44 is hindered in the stirring and transport.
Further, the undulation at the tip of the first film member 45A that is in contact with the inner wall surface of the toner containing portion 41b is suppressed, and the toner can be uniformly conveyed in the width direction of the toner containing portion 41b.
Further, since the thickness of the first film member 45A that rotates while being in contact with the inner wall surface of the toner accommodating portion 41b can be set within the range of 30 to 70 μm, preferably 40 to 60 μm, the first film member Splashing can be suppressed at the opening of the delivery port 41c at the tip of 45A, and toner blowout from the gap between the developing unit 41a and the developing roller 42 can be prevented.

  The embodiments of the present invention have been described with specific examples. However, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications are made without departing from the spirit of the present invention. It is possible.

  For example, the present invention can be applied not only to a developing device using a magnetic one-component toner but also to a developing device using a non-magnetic one-component toner. As an image forming apparatus, not only an image forming apparatus for monochrome printing, An image forming apparatus for color printing can also be provided.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Control apparatus 11 ... Controller 12 ... Image processing part 13 ... Power supply device 20 ... Paper feed device 21 ... Paper stacking plate 22 ... Paper Drawer 23 ... Registration roller pair 30 ... Photosensitive unit 31 ... Photosensitive drum 32 ... Charging rollers 40, 40A, 100 ... Developing device 41 ... Developing housing 41a ... Developing Part 41b... Toner containing part 41c .. delivery port 42 .. developing roller 43... Agitator 44 .. rotating shaft 44a .. sticking surface 44b ... holder part 45, 45A. 1 film member 46, 46A ... second film member 47 ... shaft 48 ... layer regulating blade 49 ... toner storage chamber 50 ... exposure device 60 ... transfer device 70 ...・ Fixing device AD ・ ・ ・ Double-sided tape

Claims (3)

A housing provided with a delivery port for containing the toner and delivering the toner inside;
A rotating shaft pivotally supported so as to be rotationally driven in the housing;
A film member that conveys the toner contained in the outer housing while stirring along the inner wall of the housing and sends out the toner from the outlet.
The base end portion of the film member is fixed to the rotating shaft in a state where the two film members are overlapped, and the thickness of the first film member disposed on the downstream side in the rotational direction is t1, and disposed on the upstream side in the rotational direction. the thickness of the second film member is taken as t2 was, t1> t2 der is, radial direction of the length of the first film member is shorter than the minimum radius of the length of the inner wall of the housing, The length in the rotational radius direction of the second film member is set to be longer than the length of the maximum radius of the inner wall of the housing .
A developing device. The first film member is formed at least in the width direction length of the delivery port, the width of the first film member in the direction intersecting the rotation direction is W1, and the width of the second film member is W2. When W1 <W2,
The developing device according to claim 1. A photoreceptor on which an electrostatic latent image is formed;
Charging means for charging the photoreceptor;
Latent image forming means for forming a latent image by exposing the photoreceptor charged by the charging means;
The developing device according to claim 1 or 2 , which develops the latent image formed by the latent image forming unit.
Transfer means for transferring an image obtained by development of the developing device to a recording medium;
Fixing means for fixing the image transferred to the recording medium by the transfer means,
An image forming apparatus.

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