JP5867338B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  Patent Document 1 describes a manufacturing method for manufacturing a thin cylindrical image carrier by impact processing. This manufacturing method includes a step of cutting off both ends of a cylindrical body obtained by impact processing to obtain a base material.

JP 2000-10306 A

  An object of the present invention is to suppress a toner cloud from being scattered outward in the axial direction of an image holding member with a simple configuration.

  In the image forming apparatus according to the first aspect of the present invention, the closed bottom is integrally formed at the end on one end side in the axial direction, the end on the other end side in the axial direction is opened, and the end on the one end side is opened. An image holding member configured to include a cylindrical roll member integrally formed with an annular protrusion protruding in the radial direction on the peripheral surface, and developing while rotating the electrostatic latent image formed on the image holding member And a supporting member that supports the rotating shaft of the developing member and that faces the annular protrusion in the radial direction of the image carrier.

  An image forming apparatus according to a second aspect of the present invention is the image forming apparatus according to the first aspect, further comprising: a charging member that charges the image holding member; and a power supply portion that applies a voltage to the charging member is It is arranged on the other end side of the charging member in the axial direction.

  An image forming apparatus according to a third aspect of the present invention is the image forming apparatus according to the first aspect, wherein a feeding portion for applying a voltage to the developing member is located on the other end side of the developing member in the axial direction. It is characterized by being arranged.

  According to the image forming apparatus of the first aspect of the present invention, compared with the case where the annular protrusion formed on the one end side of the roll member is not opposed to the support member that supports the rotation shaft of the developing member. It is possible to suppress the cloud from being scattered outside in the axial direction of the image carrier with a simple configuration.

  According to the image forming apparatus of claim 2 of the present invention, as compared with the case where the power feeding portion for applying a voltage to the charging member is arranged on one end side with respect to the charging member in the axial direction of the image carrier. , Power feeding failure can be suppressed.

  According to the image forming apparatus of claim 3 of the present invention, as compared with the case where the power feeding portion for applying a voltage to the developing member is arranged on one end side with respect to the developing member in the axial direction of the image holding member. , Power feeding failure can be suppressed.

1A and 1B are a front view and a side view showing an image carrier and a developing roll used in an image forming apparatus according to an embodiment of the present invention. FIG. 3 is a front view showing an image carrier and a charging member used in the image forming apparatus according to the embodiment of the present invention. 1 is a perspective view showing one end side of an image carrier used in an image forming apparatus according to an embodiment of the present invention. (A) (B) (C) It is process drawing which showed the manufacturing process of the roll member which comprises the image holding body used for the image forming apparatus which concerns on embodiment of this invention. (A) (B) It is process drawing which showed the manufacturing process of the roll member which comprises the image holding body used for the image forming apparatus which concerns on embodiment of this invention. FIG. 3 is a perspective view showing members used to manufacture a roll member that constitutes an image carrier used in the image forming apparatus according to the embodiment of the present invention. 1 is a schematic configuration diagram illustrating an image forming apparatus according to an embodiment of the present invention.

  An example of an image forming apparatus according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow V shown in the drawing indicates a vertical direction, an arrow H indicates a horizontal direction indicating the apparatus left-right direction, and an arrow D indicates a horizontal direction indicating the apparatus depth direction.

(overall structure)
As shown in FIG. 7, an image processing unit 12 that performs image processing on input image data is provided inside the apparatus main body 10 </ b> A of the image forming apparatus 10.

  The image processing unit 12 processes input image data into gradation data of four colors of yellow (Y), magenta (M), cyan (C), and black (K). An exposure device 14 that receives gradation data processed by the image processing unit 12 and performs image exposure with the laser beam LB is provided on the center side in the apparatus main body 10A.

  Also, above the exposure device 14 in the vertical direction, four image forming units 16Y, 16M, 16C, and 16K of yellow (Y), magenta (M), cyan (C), and black (K) are in the horizontal direction. Are arranged at intervals in the inclined direction, and can be attached to and detached from the apparatus main body 10A. These image forming units 16Y, 16M, 16C, and 16K form toner images of respective colors. If there is no need to distinguish between Y, M, C, and K, Y, M, C, and K may be omitted.

  On the other hand, a primary transfer unit 18 is provided above the image forming units 16 of the respective colors in the vertical direction so that the toner images formed by the image forming units 16 of the respective colors are transferred in a multiple manner. Further, on the side (right side in the drawing) of the primary transfer unit 18, multiple transfer onto the primary transfer unit 18 is performed on a sheet member P as a recording medium conveyed along a conveyance path 60 by a supply conveyance unit 30 described later. A secondary transfer roll 22 for transferring the toner image thus formed is provided.

  A fixing device 24 that fixes the toner image transferred to the sheet member P to the sheet member P by heat and pressure is provided downstream of the secondary transfer roll 22 in the conveying direction of the sheet member P. Further, on the downstream side in the conveying direction of the sheet member P with respect to the fixing device 24, the sheet member P on which the toner image is fixed is discharged to a discharge portion 26 provided on the upper portion of the apparatus main body 10A of the image forming apparatus 10. A discharge roll 28 is provided.

  On the other hand, a supply conveyance unit 30 that supplies and conveys the sheet member P is provided below and to the side of the exposure apparatus 14 in the vertical direction.

[Image forming unit]
First, the image forming unit 16 will be described.

  The image forming units 16 for the respective colors are all configured similarly. Each color image forming unit 16 includes a rotating cylindrical image carrier 34, a charging device 36 for charging the peripheral surface of the image carrier 34, and the exposure described above on the peripheral surface of the charged image carrier 34. A developing device 38 that develops an electrostatic latent image formed by image exposure of the device 14 with a developer (toner) to form a toner image, and a cleaning device 44 that cleans the peripheral surface of the image carrier 34 are provided. . Details of the image carrier 34, the charging device 36, and the developing device 38 will be described later.

[Exposure equipment]
Next, the exposure apparatus 14 will be described.

  Inside the casing 14A of the exposure apparatus 14, a polygon mirror 32 that is a rotary polygon mirror is disposed. Laser beams LB-Y, LB-M, LB-C, and LB-K emitted from a semiconductor laser 54 as an example of a light source are irradiated to the polygon mirror 32 through a cylindrical lens (not shown), and the polygon The mirror 32 is deflected and scanned in the main scanning direction. Then, the laser beams LB-Y, LB-M, LB-C, and LB-K deflected and scanned by the polygon mirror 32 pass through the imaging lens and a plurality of mirrors (not shown) to the image carrier 34. The upper exposure position is scanned and exposed from obliquely below.

  Thus, the exposure device 14 performs scanning exposure on the image carrier 34 from obliquely below. For this reason, there is a possibility that foreign substances such as toner may fall on the exposure device 14 from the developing device 38 provided in the image forming unit 16 of each color positioned above. Therefore, four laser beams LB-Y, LB-M, LB-C, and LB-K are applied to the portion facing upward on the peripheral surface of the housing 14A, and the image carrier 34 of the image forming unit 16 of each color. Transparent glass 40Y, 40M, 40C, and 40K are provided as an example of a transparent glass transparent member that transmits upward.

[Primary transfer unit and secondary transfer roll]
Next, the primary transfer unit 18 and the secondary transfer roll 22 will be described.

  The primary transfer unit 18 is disposed above the image forming unit 16 of each color in the vertical direction. The primary transfer unit 18 includes an endless intermediate transfer belt 42, a drive roll 46 around which the intermediate transfer belt 42 is wound and rotationally driven to rotate the intermediate transfer belt 42 in the direction of arrow A, and the intermediate transfer belt 42 is wound around the primary transfer unit 18. A tension applying roll 48 that is applied to apply tension to the intermediate transfer belt 42, a driven roll 50 that is disposed vertically above the tension applying roll 48 and is driven to rotate with the intermediate transfer belt 42, and the intermediate transfer belt 42. A primary transfer roll 52 disposed on the opposite side of the image carrier 34 of each color.

  As a result, the yellow (Y), magenta (M), cyan (C), and black (K) toner images sequentially formed on the image carrier 34 of each color image forming unit 16 are transferred to the primary transfer of each color. Multiple rolls are transferred onto the intermediate transfer belt 42 by the roll 52.

  Further, a cleaning blade 56 that contacts the peripheral surface of the intermediate transfer belt 42 and cleans the peripheral surface of the intermediate transfer belt 42 is disposed on the opposite side of the drive roll 46 with the intermediate transfer belt 42 interposed therebetween. Further, on the opposite side of the driven roll 50 with the intermediate transfer belt 42 interposed therebetween, a secondary transfer roll 22 for transferring the toner image transferred onto the intermediate transfer belt 42 to the conveyed sheet member P is provided. .

  As described above, the yellow (Y), magenta (M), cyan (C), and black (K) toner images transferred in multiple onto the intermediate transfer belt 42 are conveyed by the intermediate transfer belt 42. The conveyed toner image is sandwiched between the driven roll 50 and the secondary transfer roll 22 and is secondarily transferred to the sheet member P conveyed along the conveyance path 60 by a supply conveyance unit 30 described later. ing.

[Supply transport unit]
Next, the supply conveyance unit 30 that supplies and conveys the sheet member P will be described.

  The supply / conveyance unit 30 includes a sheet feeding member 62 that is disposed vertically below the exposure apparatus 14 in the apparatus main body 10A and on which a plurality of sheet members P are stacked.

  Further, the supply and conveyance unit 30 includes a sheet feeding roll 64 that feeds the sheet member P stacked on the sheet feeding member 62 to the conveyance path 60 and a separation roll that separates the sheet member P fed by the sheet feeding roll 64 one by one. 66 and an alignment roll 68 for adjusting the conveyance timing of the sheet member P. And each roll is arrange | positioned in this order toward the downstream from the conveyance direction upstream of the sheet | seat member P. As shown in FIG.

  With this configuration, the sheet member P supplied from the paper supply member 62 is set to a position (secondary transfer position) where the intermediate transfer belt 42 and the secondary transfer roll 22 are in contact with each other by the rotating alignment roll 68. It comes to be sent out by.

  Further, the supply / conveyance unit 30 forms the toner image on the other surface without discharging the sheet member P, on which the toner image is fixed on one surface by the fixing device 24, to the discharge unit 26 by the discharge roll 28. For this purpose, a double-sided conveyance device 70 is provided.

  The double-sided conveyance device 70 is arranged along the double-sided conveyance path 72 and the double-sided conveyance path 72 along which the sheet member P is conveyed so as to reverse the front and back of the sheet member P from the discharge roll 28 toward the alignment roll 68. A conveyance roll 74 and a conveyance roll 76 that convey the sheet member P are provided.

(Operation of the overall configuration)
With this configuration, an image is formed on the sheet member P as follows.

  First, gradation data of each color is sequentially output from the image processing unit 12 to the exposure device 14. The laser beams LB-Y, LB-M, LB-C, and LB-K emitted from the exposure device 14 according to the gradation data scan the peripheral surface of the image carrier 34 charged by the charging device 36. Exposure (exposure in the main scanning direction). Thereby, an electrostatic latent image is formed on the peripheral surface of the image carrier 34. The electrostatic latent image formed on the image carrier 34 is developed by the developing device 38 of each color, and is converted into a toner image of each color of yellow (Y), magenta (M), cyan (C), and black (K). Visualized.

  Further, the yellow (Y), magenta (M), cyan (C), and black (K) toner images formed on the image carrier 34 circulate by the primary transfer roll 52 of the primary transfer unit 18. Multiple transfer is performed on the intermediate transfer belt 42.

  The toner images of each color transferred onto the circulating intermediate transfer belt 42 in a multiple manner are conveyed from the sheet feeding member 62 along the conveyance path 60 by the sheet feeding roll 64, the separation roll 66, and the alignment roll 68. Secondary transfer is performed on P by the secondary transfer roll 22.

  Further, the sheet member P to which the toner image has been transferred is conveyed to the fixing device 24. Then, the toner image is fixed on the sheet member P by the fixing device 24. The sheet member P on which the toner image is fixed is discharged to the discharge unit 26 by the discharge roll 28.

  On the other hand, when images are formed on both surfaces of the sheet member P, the sheet member P, on which the toner image is fixed on one surface (front surface) by the fixing device 24, is not directly discharged to the discharge portion 26 by the discharge roll 28. The conveyance direction of the sheet member P is switched by reversing the discharge roll 28. And this sheet member P is conveyed along the double-sided conveyance path | route 72 by the conveyance rolls 74 and 76. FIG.

  The sheet member P conveyed along the double-sided conveyance path 72 is conveyed to the alignment roll 68 again with the front and back reversed. This time, after the toner image is transferred and fixed on the other surface (back surface) of the sheet member P, the sheet member P is discharged to the discharge portion 26 by the discharge roll 28.

(Main part configuration)
Next, the image carrier 34, the developing device 38, and the charging device 36 will be described.

(Image carrier)
First, the image carrier 34 will be described. As shown in FIG. 1A, the image carrier 34 includes a cylindrical roll member 80 and a semiconductive layer 82 (photosensitive layer) formed on the peripheral surface of the roll member 80. ing.

[Roll member]
The roll member 80 is integrally formed with a closed bottom 80A on one end side in the axial direction of the roll member 80 (left side in the drawing: hereinafter simply referred to as “one end side in the roll axial direction”). The other end side in the direction (right side in the figure: hereinafter simply referred to as “the other end side in the roll axis direction”) is open (see FIG. 5B).

  Further, a cylindrical shaft protrusion 88 that is a rotation shaft of the image holding member 34 is integrally formed on the closed bottom 80 </ b> A of the roll member 80. Further, a top wall 88A is formed on the shaft projection 88, and a triangular concave portion 90 having a triangular concave shape is formed on the top wall 88A as shown in FIG. A triangular portion 105 </ b> A (see FIG. 1A) formed at the distal end portion of the output shaft 105 of the motor 104, which will be described later, is inserted into the triangular recess position 90, so that the rotational force is transferred via the output shaft 105 to the roll member. 80 (image carrier 34).

  Further, a triangular rib 92 that connects the peripheral surface 88B of the shaft projection 88 and the closed bottom 80A is formed integrally with the closed bottom 80A. Specifically, four triangular ribs 92 are formed at regular intervals (for example, 90 degrees) in the circumferential direction of the shaft protrusion 88.

  In the present embodiment, the roll axis direction and the apparatus depth direction are the same direction with the image forming unit 16 attached to the apparatus main body 10A. The one end side in the roll axis direction is the apparatus depth side in the apparatus depth direction, and the other end side in the roll axis direction is the apparatus front side in the apparatus depth direction.

[Method of manufacturing roll member]
Here, the manufacturing method of the roll member 80 is demonstrated. The roll member 80 is formed (manufactured) by impact processing.

  For impact processing, as shown in FIG. 6, a concave mold 204 in which a material 202 (for example, aluminum) is stored, and a cylindrical shape in which the material 202 is pressed by pressing the material 202 stored in the concave mold 204. A punch mold 200 is used.

  A protrusion 200 </ b> A for forming a shaft protrusion 88 is provided at the tip of the cylindrical punch mold 200. Further, the concave mold 204 is configured such that the front end side of the punch mold 200 is inserted, and has a circular shape in plan view along the shape of the front end side of the punch mold 200. Further, the material 202 has a short cylindrical shape in the axial direction so as to be accommodated in the concave mold 204.

  In the impact process in which the cylindrical roll member 80 is formed by impact machining, first, the material 202 is stored in the concave mold 204 in a state where the punch mold 200 is disposed above the concave mold 204 (FIG. 4A). )reference).

  Next, as shown in FIGS. 4B and 4C, the punch die 200 moves downward to crush and deform the material 202 stored in the concave die 204. As a result, the material 202 is deformed into a cylindrical shape along the peripheral surface of the punch die 200, and the roll member 80 is formed.

  Next, as shown in FIG. 5A, the punch die 200 moves upward, and the roll member 80 that is in close contact with the punch die 200 is separated from the concave die 204.

  Next, as shown in FIG. 5B, the roll member 80 is removed (demolded) from the punch die 200. In this state, a closed bottom 80A, a shaft protrusion 88, and the like are integrally formed on one end side of the roll member 80 in the roll axis direction, and the other end side of the roll member 80 in the roll axis direction is open.

  Further, in the impact process, the lower corner portion 202A (see FIG. 6) of the material 202 is stronger than the other portion as shown in FIGS. 4 (A) and 4 (B). It is pressed against the inner wall. When the roll member 80 is separated from the concave mold 204, the shock line projection 80D as an example of the annular projection is one end of the roll member 80 in the roll axial direction as shown in FIGS. It is formed annularly on the side. That is, the corner portion 202A is deformed to become the shock line projection 80D.

  The shock line protrusion 80D protrudes, for example, about 100 [μm] with respect to the general surface (the peripheral surface on which the shock line protrusion 80D is not formed).

  In each figure, the protruding state is exaggerated so that it can be easily seen that the shock line protrusion 80D protrudes from the general surface.

[Arrangement of image carrier]
Next, the arrangement (layout) of the image carrier 34 will be described.

  In a state where the image forming unit 16 is attached to the apparatus main body 10A, a motor 104 for rotating the image holding body 34 is provided on one end side in the roll axis direction of the image holding body 34 as shown in FIG. Has been placed. The output shaft 105 of the motor 104 is supported by the housing 17 of the image forming unit 16, and the triangular portion 105 </ b> A formed at the tip of the output shaft 105 is inserted into the triangular recess position 90 of the shaft protrusion 88. Yes.

  On the other hand, a cap 108 for closing the other end side of the opened image holding body 34 (roll member 80) in the roll axis direction is attached to the other end side of the image holding body 34 in the roll axis direction. The cap 108 is integrally formed with a shaft portion 108 </ b> A that constitutes a rotation shaft of the image carrier 34, and the shaft portion 108 </ b> A is supported by the housing 17.

  Further, the semiconductive layer 82 described above is formed (painted) on the other end side in the roll axis direction with respect to the shock line protrusion 80D.

[Development equipment]
Next, the developing device 38 will be described.

  As shown in FIG. 1 (A), the developing device 38 is formed along the roll axis direction, and toner is formed on the image carrier 34 while rotating to face the peripheral surface of the rotating image carrier 34. A developing roll 130 is provided as an example of a developing member to be transferred to the electrostatic latent image. Further, the developing device 38 is provided with a power feeding plate 132 as an example of a power feeding portion that applies a voltage to the developing roll 130 in contact with the end of the rotating shaft 130A of the developing roll 130 on the other end side in the roll axis direction. . The developing roll 130 and the power supply plate 132 are supported by the housing 17.

  Here, the support member 134 that constitutes a part of the housing 17 and supports one end side in the roll axis direction of the rotation shaft 130A is disposed to face the shock line protrusion 80D in the radial direction of the image carrier 34. Yes. When viewed from the roll axis direction, as shown in FIG. 1B, a gap between the shock line projection 80D and the support member 134 is formed at the facing portion between the image carrier 34 and the developing roll 130 where the toner cloud is generated. It is narrower.

  Further, a tracking roll 136 fixed to the rotating shaft 130 </ b> A is provided on one end side in the roll axis direction with respect to the support member 134. The circumferential surface of the tracking roll 136 is in contact with the circumferential surface of the image holding member 34, so that the circumferential surface of the developing roller 130 and the circumferential surface of the image holding member 34 are a fixed distance (in this embodiment, 40 [μm]). Degree).

  Further, a gear member 138 fixed to the rotating shaft 130A is provided on one end side in the roll axis direction with respect to the tracking roll 136. A rotational force for rotating the developing roll 130 is transmitted to the developing roll 130 via the gear member 138.

  On the other hand, the power supply plate 132 disposed on the other end side in the roll axis direction with respect to the developing roll 130 has an inverted U shape. The plate surface of the power supply plate 132 and the end surface of the rotary shaft 130A are in contact with each other in the roll axis direction.

[Charging device]
Next, the charging device 36 will be described.

  As shown in FIG. 2, the charging device 36 is a charging member that extends along the roll axis direction and charges the peripheral surface of the image carrier 34 while being rotated by contact with the peripheral surface of the rotating image carrier 34. As an example, a charging roll 120 is provided. Further, the charging device 36 includes a power feeding plate 122 as an example of a power feeding part that applies a voltage to the charging roll 120 by contacting the end of the rotating shaft 120A of the charging roll 120 on the other end side in the roll axis direction. . The charging roll 120 and the power supply plate 122 are supported by the housing 17.

  Here, the support member 124 that constitutes a part of the housing 17 and supports one end side in the roll axis direction of the rotating shaft 120A is disposed on one end side in the roll axis direction with respect to the shock line protrusion 80D. . That is, in the roll axis direction, the support member 124 is disposed at a position different from the shock line projection 80D. The support member 124 is made of a nonconductive material.

  On the other hand, the power feeding plate 122 disposed on the other end side in the roll axis direction is supported by the housing 17 and has an inverted U shape. The plate surface of the power feeding plate 122 and the end surface of the rotating shaft 120A are in contact with each other.

(Effects of main components)
As described above, the support member 134 that supports one end of the rotating shaft 130A in the roll axis direction is disposed to face the shock line protrusion 80D in the radial direction of the image carrier 34 (FIG. 1A). reference). For this reason, the gap between the support member 134 and the image carrier 34 is narrower than in the case where the support member 134 does not face the shock line protrusion 80D.

  Thus, in the image carrier 34 including the roll member 80 having the closed bottom 80A on one end side and the other end opened, a toner cloud generated between the developing roll 130 and the image carrier 34. Scattering of (toner that rises like a mist) to the outside in the roll axis direction is suppressed.

  Further, by suppressing the scattering of the toner cloud to the outside in the roll axis direction, the outer peripheral surface of the tracking roll 136 disposed on one end side in the roll axis direction with respect to the support member 134 and the outer peripheral surface are contacted. The adhesion of toner to the peripheral surface of the image carrier 34 is suppressed. For this reason, a change in the distance between the peripheral surface of the developing roll 130 and the peripheral surface of the image holding member 34 is suppressed.

  Further, the power supply plate 132 for applying a voltage to the developing roll 130 is disposed so as to be in contact with the other end of the rotating shaft 130A of the developing roll 130 in the roll axis direction (see FIG. 1A). . Here, as described above, since the shock line protrusion 80D protrudes from the general surface, it is conceivable that toner accumulates at the base end portion of the shock line protrusion 80D due to the toner cloud described above. Then, it is conceivable that the accumulated toner adheres to the power supply plate 132 to cause power supply failure. However, the power feeding plate 132 is disposed on the other end side in the roll axial direction with respect to the developing roll 130, while the shock line projection 80 </ b> D is disposed on one end side in the roll axial direction with respect to the developing roll 130.

  As a result, compared to the case where the power supply plate 132 and the shock line protrusion 80D are arranged on the same side, power supply failure caused by the toner accumulated in the shock line protrusion 80D adhering to the power supply plate 132 is suppressed. .

  Further, the power supply plate 122 that applies a voltage to the charging roll 120 is disposed so as to contact the end of the rotating shaft 120A on the other end side in the roll axis direction (see FIG. 2). Here, as described above, it is conceivable that toner accumulates at the base end portion of the shock line projection 80D. Then, it is conceivable that the accumulated toner adheres to the power supply plate 122 to cause power supply failure. However, the power feeding plate 122 is disposed on the other end side in the roll axial direction with respect to the charging roll 120, while the shock line protrusion 80 </ b> D is disposed on one end side in the roll axial direction with respect to the charging roll 120.

  As a result, compared with the case where the power supply plate 122 and the shock line protrusion 80D are arranged on the same side, power supply failure caused by the toner accumulated in the shock line protrusion 80D adhering to the power supply plate 122 is suppressed. .

  Further, the support member 124 that supports the rotary shaft 120A on one end side in the roll axis direction is disposed on one end side in the roll axis direction with respect to the shock line protrusion 80D (see FIG. 2). That is, in the roll axis direction, the support member 124 is disposed at a position different from the shock line projection 80D. Here, as described above, it is conceivable that toner accumulates at the base end portion of the shock line projection 80D. Then, it is conceivable that the accumulated toner adheres to the sliding portion between the support member 124 and the rotation shaft 120A, and the rotation failure of the charging roll 120 occurs. However, as described above, in the roll axis direction, the support member 124 is disposed at a position different from the shock line protrusion 80D.

  As a result, it is possible to prevent the toner accumulated in the base end portion of the shock line protrusion 80D from adhering to the sliding portion between the support member 124 and the rotating shaft 120A and causing the rotation failure of the charging roll 120.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments can be taken within the scope of the present invention. This will be apparent to those skilled in the art. For example, in the above embodiment, the support member 124 is arranged on one end side in the roll axis direction with respect to the shock line protrusion 80D, so that it does not overlap with the shock line protrusion 80D in the roll axis direction. By disposing the support member on the other end side in the roll axis direction with respect to the shock line protrusion 80D, the support member may not overlap the shock line protrusion 80D in the roll axis direction.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 34 Image holding body 80 Roll member 80A Closed bottom 80D Shock line protrusion (an example of annular protrusion)
120 charging roll (an example of a charging member)
122 Power feeding plate (an example of a power feeding part)
130 Developing roll (an example of a developing member)
132 Power feeding plate (an example of a power feeding part)
134 Support member

Claims (3)

A closed bottom is integrally formed at the end on one end side in the axial direction, the end on the other end side in the axial direction is opened, and an annular protrusion protruding in the radial direction is integrally formed on the peripheral surface on the one end side. An image carrier configured to include a cylindrical roll member formed on
A developing member for developing the electrostatic latent image formed on the image carrier while rotating;
A support member that supports the rotation shaft of the developing member and faces the annular protrusion in the radial direction of the image carrier;
An image forming apparatus comprising: A charging member for charging the image carrier,
The image forming apparatus according to claim 1, wherein a power feeding portion that applies a voltage to the charging member is disposed on the other end side of the charging member in the axial direction.   The image forming apparatus according to claim 1, wherein a power feeding portion that applies a voltage to the developing member is disposed on the other end side of the developing member in the axial direction.

Images