JP2014041303A - Roll member and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll member configured to prevent a peripheral surface thereof from being damaged when conveying or storing the roll member, and to provide an image forming device.SOLUTION: Even when a roll member 80 laid on a horizontal plane 220 is rotated, a peripheral surface between an end 84 on the other end side of a roll axial direction in the roll member 80 and a shock line projection 80D separates from the horizontal plane 220. Even when the roll member 80 is laid on the horizontal plane 220 for conveyance or storage, damage to the peripheral surface of the roll member 80 can be prevented, accordingly.

Description

  The present invention relates to a roll member and 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

  The subject of this invention is suppressing that the surrounding surface of a roll member is damaged in the case of conveyance or storage of a roll member.

  The roll member according to claim 1 of the present invention is cylindrical, and has a closed bottom integrally formed on one end side in the axial direction, the other end side in the axial direction is opened, and an annular protrusion protruding in the radial direction Is formed on the one end side and placed in a horizontal plane, the end on the other end side in the axial direction and the annular protrusion are in contact with the horizontal plane, and the end on the other end side in the axial direction. And the annular protrusion is spaced apart from the horizontal plane.

  The roll member according to claim 2 of the present invention is the roll member according to claim 1, wherein a surface treatment is formed on the peripheral surface on the other end side at least with respect to the annular protrusion, In the placed state, the surface treatment formed on the peripheral surface between the end on the other end side in the axial direction and the annular protrusion is separated from the horizontal plane.

  According to a third aspect of the present invention, there is provided an image forming apparatus comprising the roll member according to the second aspect, and a developing device for developing an electrostatic latent image formed on the image holding body. It is characterized by providing.

  According to the roll member of claim 1 of the present invention, compared to the case where the peripheral surface between the end portion on the other end side in the axial direction and the annular protrusion is in contact with the horizontal plane in a state where it is placed horizontally on the horizontal plane. And it can suppress that the surrounding surface of a roll member is damaged in the case of conveyance or storage of a roll member.

  According to the roll member of claim 2 of the present invention, the surface treatment formed on the peripheral surface between the end portion on the other end side in the axial direction and the annular projection in a state of being placed horizontally on the horizontal plane is a horizontal plane. Compared with the case where it contacts, it can suppress that the surface treatment formed in the surrounding surface of a roll member is damaged in the case of conveyance or storage of a roll member.

  According to the image forming apparatus of the third aspect of the present invention, it is possible to suppress the quality degradation of the output image as compared with the case where the image carrier is not configured to include the roll member according to the second aspect. .

It is the front view which showed the roll member which concerns on embodiment of this invention. It is the perspective view which showed the one end side of the roll axial direction in the roll member which concerns on embodiment of this invention. 1 is a front view showing an image carrier used in a roll member and 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 concerns on embodiment of this invention. (A) (B) It is process drawing which showed the manufacturing process of the roll member which concerns on 1st Embodiment of this invention. It is the perspective view which showed the member used for manufacturing the roll member which concerns on embodiment of this invention. (A) (B) (C) It is process drawing which showed the process of forming a semiconductive layer in the roll member which concerns on embodiment of this invention. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention.

  An example of a roll member and 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. 8, 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. And a developing device 38 that develops the electrostatic latent image formed by the image exposure of the device 14 with a developer (toner) to form a toner image. Details of the image carrier 34 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 will be described. As shown in FIG. 3, the image carrier 34 includes a cylindrical roll member 80 and a semiconductive layer 82 (photosensitive layer) as an example of a surface treatment formed on the peripheral surface of the roll member 80. It consists of

(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.

  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, as shown in FIG. 2, a triangular concave portion 90 having a triangular concave shape is formed on the top wall 88 </ b> A of the axial protrusion 88. A triangular portion 105A (see FIG. 1) 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 to the roll member 80 (image) via the output shaft 105. Is transmitted to the holding body 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. Four triangular ribs 92 are formed at regular intervals (for example, 90 degrees) in the circumferential direction of the shaft protrusion 88.

  Further, since the roll member 80 is formed (manufactured) by impact processing described later, one end side in the roll axial direction of the roll member 80 is described as a radial direction of the roll member 80 (hereinafter simply referred to as “roll radial direction”). A shock line projection 80D is formed as an example of an annular projection that projects into the projection.

  Furthermore, as viewed from the roll radial direction, the roll member 80 is curved as shown in FIG. Even when the semiconductive layer 82 (see FIG. 3) is not formed or formed, the other end of the roll member 80 in the roll axis direction when the roll member 80 is placed on the horizontal surface 220. The side end portion 84 and the shock line projection 80D are in contact with the horizontal plane 220. Then, even if the roll member 80 is rotated on the horizontal plane 220, the end 84 on the other end side in the roll axis direction of the roll member 80 (a portion where an image is not formed when the image holding member 34 is configured by the roll member 80) ) And the shock line projection 80D are determined such that the projection amount (G dimension in FIG. 1) of the shock line projection 80D is determined so as to be separated from the horizontal plane 220.

  Specifically, the roll member 80 is viewed from the roll radial direction so that the roll member 80 appears to be curved most, the upper side bending amount of the upper side is H [μm], and the lower side bending amount of the lower side is J Assuming that [μm], the projection amount G [μm] of the shock line projection 80D satisfies the following formula (1).

G> H + J ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Formula (1)
For example, when the upper side bending amount and the lower side bending amount are 50 [μm], the protrusion amount G is larger than 100 [μm].

  Here, the protrusion amount G (see FIG. 1) of the shock line projection 80D is the height (distance) in the roll radial direction from the base end portion to the tip end portion of the shock line projection 80D.

  Further, the upper side bending amount H (see FIG. 1) of the roll member 80 is a straight line connecting the one end portion and the other end portion of the upper side when the roll member 80 is viewed from the roll radial direction where the roll member 80 appears to be most curved. And the distance between the two lines at a position where the upper side is farthest in the roll radial direction.

  Further, the lower side bending amount J (see FIG. 1) of the roll member 80 is a straight line connecting one end portion and the other end portion of the lower side when the roll member 80 is viewed from the radial direction of the roll where the roll member 80 appears to be most curved. And the distance between the two lines at the position where the lower side is farthest in the roll radial direction.

  Thus, the protrusion amount G of the shock line protrusion 80D is determined so as to satisfy the expression (1). Thus, as described above, even if the roll member 80 is rotated on the horizontal plane 220, the peripheral surface and the peripheral surface between the end 84 on the other end side in the roll axial direction of the roll member 80 and the shock line protrusion 80D. The semiconductive layer 82 formed in the step is separated from the horizontal plane 220.

  In addition, about the protrusion degree of shock line protrusion 80D shown in FIG.1, FIG.2, FIG.3, FIG. 5, and the curvature degree of the roll member 80 shown in FIG. 1, it exaggerated and described so that each degree may be understood easily. Has been.

  In the present embodiment, the roll axis direction and the apparatus depth direction are the same in a state where the image forming unit 16 is 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 for producing 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. After the corner portion 202A is strongly pressed against the inner peripheral wall of the concave mold 204, the roll member 80 is separated from the concave mold 204, whereby the shock line projection 80D is shown in FIGS. 5 (A) and 5 (B). As described above, the roll member 80 is formed in an annular shape on one end side in the roll axis direction. In this way, the corner portion 202A is deformed to become the shock line projection 80D.

  For this reason, the protrusion amount G of the shock line protrusion 80D can be adjusted (controlled) by changing the shape of the corner portion 202A. For example, by increasing the roundness (R) of the corner 202A, the protrusion amount G of the shock line protrusion 80D is reduced.

[Method of painting semiconductive layer]
Next, a method for coating the semiconductive layer 82 formed on the peripheral surface of the roll member 80 will be described.

  The semiconductive layer 82 is formed (painted) on the peripheral surface of the roll member 80 by performing dipping coating (immersion coating) a plurality of times.

  First, as shown in FIG. 7A, the holding member 210 that is a holding jig holds the shock line protrusion 80D protruding from the general surface. Thereby, the holding member 210 holds the roll member 80 so that the closed bottom 80A of the roll member 80 faces upward (gripping step).

  Next, as the gripping member 210 moves downward, as shown in FIG. 7B, the roll member 80 is immersed in the dipping tank 214 filled with the paint 212 (immersion step).

  In this dipping process, the lower side (the other side in the roll axis direction) of the roll member 80 than the shock line projection 80D is in contact with (immersed in) the paint 212 filled in the dipping tank 214.

  Next, as the gripping member 210 moves upward, the roll member 80 is pulled up from the dipping tank 214 as shown in FIG. Thereafter, the paint formed on the roll member 80 is dried (drying step).

  This series of steps is repeated a plurality of times, and a plurality of different layers are laminated on the peripheral surface of the roll member 80, whereby the semiconductive layer 82 is formed (painted) on the roll member 80.

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

  With the image forming unit 16 attached to the apparatus main body 10A, a motor 104 for rotating the image carrier 34 is disposed on one end side in the roll axis direction of the image carrier 34 as shown in FIG. Yes. 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.

(Effects of main components)
As described above, even if the semiconductive layer 82 is not formed or formed, even if the roll member 80 is rotated with the roll member 80 placed on the horizontal surface 220, the roll member may be rotated. 80, the peripheral surface between the end 84 on the other end side in the roll axis direction and the shock line projection 80D is separated from the horizontal plane 220.

  Thereby, when the semiconductive layer 82 is not formed, even if the roll member 80 is placed on the horizontal surface 220 in order to transport or store the roll member 80, the peripheral surface of the roll member 80 is damaged. It is suppressed. Further, when the semiconductive layer 82 is formed, for example, in order to transport or store the roll member 80 on which the semiconductive layer 82 is formed, the roll member 80 may be placed on the horizontal plane 220 even if it is placed sideways. Damage to the semiconductive layer 82 formed on the peripheral surface 80 is suppressed.

  In addition, since the damage to the semiconductive layer 82 is suppressed, deterioration in the quality of the output image of the image forming apparatus 10 is suppressed.

  Further, in the dipping coating dipping process for forming the semiconductive layer 82, the shock line protrusion 80D becomes a weir (breakwater), and the paint adheres to one end side in the roll axis direction with respect to the shock line protrusion 80D. Is suppressed.

  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-described embodiment, the case where the roll member 80 is used for the image holding member 34 has been described. However, any roll-shaped member used in the image forming apparatus 10 may be used, and the roll member 80 is provided in the fixing device 24. It may be used for the fixing roll to be used, may be used for the developing roll provided in the developing device 38, may be used for the primary transfer roll 52, may be used for the secondary transfer roll 22, and is provided in the charging device 36. You may use for a charging roll, and may use for the roll member etc. which convey the sheet | seat member P and the intermediate transfer belt 42. FIG.

  Although not specifically described in the above embodiment, the roll member 80 may be used for a developing roll provided in the developing device 38. In this case, a sandblasting process ( Damage of one example of the surface treatment is suppressed.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 34 Image holding body 38 Developing apparatus 80 Roll member 80A Closed bottom 80D Shock line protrusion (an example of annular protrusion)
82 Semiconductive layer (example of surface treatment)
84 End 220 Horizontal

Claims (3)

  A cylindrical bottom is integrally formed on one end side in the axial direction, the other end side in the axial direction is opened, and an annular protrusion projecting in the radial direction is formed on the one end side, and lies horizontally on the horizontal plane. In this state, the end on the other end side in the axial direction and the annular protrusion are in contact with the horizontal plane, and the peripheral surface between the end on the other end side in the axial direction and the annular protrusion is the A roll member separated from a horizontal plane.   At least the peripheral surface of the other end side with respect to the annular protrusion is subjected to a surface treatment, and in a state where it is placed on a horizontal surface, the end portion on the other end side in the axial direction is between the annular protrusion. The roll member according to claim 1, wherein the surface treatment formed on the peripheral surface is separated from the horizontal plane. An image holding member configured to include the roll member according to claim 2;
A developing device for developing the electrostatic latent image formed on the image carrier;
An image forming apparatus comprising:

Images