JP2013148779A - Charging device, image holder device, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a charging device, an image holder device and an image forming apparatus capable of suppressing cleaning unevenness which occurs along a rotary shaft direction of a charging member.SOLUTION: When a cleaning member 52 rotates, an eccentric cam 60 fixed to a second rotary shaft member 52A of the cleaning member 52 rotates. When the eccentric cam 60 rotates, the rotating cleaning member 52 swings around an apex F of a crown shaped charging layer 14B as a center, and alternately comes in contact with an inclined plane on the right side of the charging layer 14B, and an inclined plane on the left side of the charging layer 14B. Thus, dirt such as toner, an external additive or the like adhering to inclined planes on both sides of the charging layer 14B is moved or scraped off toward a side of a cleaning part 52B. Consequently, cleaning unevenness which occurs along a rotary shaft direction of a charging roll 14 can be suppressed.

Description

  The present invention relates to a charging device, an image carrier device, and an image forming apparatus.

  In the configuration described in Patent Document 1, there is provided a bearing portion that rotatably supports a charging roll that is pressed against the photosensitive drum and driven to rotate and charged, and a sponge member that is pressed against the charging roll and driven to rotate and cleaned. It has been. The bearing portion includes a bearing hole having a diameter larger than the shaft diameter of the shaft of the sponge member, and supports the sponge member so as to be movable in the press-contact direction to the charging roll (charging member).

JP2007-127806A

  The subject of this invention is suppressing the cleaning nonuniformity which arises along the rotating shaft direction of a charging member.

  According to a first aspect of the present invention, there is provided a charging device that is provided on the outer peripheral surface of the first rotating shaft member and the first rotating shaft member, and is charged such that the center in the axial direction has a larger diameter than both ends in the axial direction. A charging member that contacts the rotating image holding member and the charging unit, and rotates with the rotation of the image holding member to charge the surface of the image holding member, and the first rotating shaft member Provided on one end side of the holding member, and a cleaning member that extends along a rotation axis direction of the cleaning member and that includes a cleaning unit that contacts the charging unit to clean the charging unit, and a holding member that holds the cleaning unit. And a supporting means for supporting one end of the holding member so that the one end of the holding member is moved in the proximity and separation direction with respect to the axis of the first rotating shaft member as the charging member rotates. The other end side of the holding member is provided on the other end side of the holding member, and the other end side of the holding member is the first rotating shaft. Characterized in that it comprises a guide means for movably guiding the approaching and separating direction with respect to the axis of the timber, the.

  The charging device according to a second aspect of the present invention is the charging device according to the first aspect, wherein the holding member is a second rotating shaft member extending along a rotating shaft direction of the first rotating shaft member, The cleaning portion is provided on an outer peripheral surface of the rotating shaft member, and the cleaning member is driven to rotate as the charging member rotates.

  The charging device according to a third aspect of the present invention is the charging device according to the second aspect, wherein the support means is fixed to one end side of the second rotary shaft member, and an outer peripheral surface abuts on the first rotary shaft member. An eccentric cam that moves one end portion of the second rotary shaft member in the proximity and separation direction with respect to the axis of the first rotary shaft member as the second rotary shaft member rotates is configured. To do.

  A charging device according to a fourth aspect of the present invention is the charging device according to the first aspect, wherein the support means is fixed to one end side of the first rotating shaft member, and an outer peripheral surface abuts against one end side of the holding member. It is characterized by including an eccentric cam that moves one end of the holding member in the proximity and separation direction with respect to the axis of the first rotating shaft member as the first rotating shaft member rotates.

  The charging device according to a fifth aspect of the present invention is the charging device according to the fourth aspect, wherein the holding member is a plate member disposed so as to sandwich the cleaning portion with the charging portion. To do.

  According to a sixth aspect of the present invention, there is provided an image carrier device, and a rotating image carrier, and the surface of the image carrier is charged by rotating with the rotation of the image carrier in contact with the image carrier. A charging device according to claim 1, comprising a charging member.

  According to a seventh aspect of the present invention, there is provided an image forming apparatus comprising: a rotating image holding member; and charging for contacting the image holding member and rotating along with the rotation of the image holding member to charge the surface of the image holding member. The charging device according to claim 1, comprising: a member, an exposure device that exposes a surface of the image carrier charged by the charging device to form an electrostatic latent image, and the exposure device. And a developing device that develops the electrostatic latent image formed on the surface of the image carrier as a toner image.

  An image forming apparatus according to an eighth aspect of the present invention is an electrostatic latent image obtained by exposing the surface of the image carrier apparatus according to the sixth aspect and the image carrier body charged on the surface of the image carrier apparatus. And an developing device that develops the electrostatic latent image formed on the surface of the image carrier by the exposure device as a toner image.

  According to the charging device of the first aspect of the present invention, the holding member that holds the cleaning unit is generated along the rotation axis direction of the charging member as compared with the case where the holding member does not move with respect to the first rotation axis of the charging member. Uneven cleaning can be suppressed.

  According to the charging device of the second aspect of the present invention, it is possible to suppress the cleaning portion from being worn by the frictional force generated between the cleaning member and the charging member as compared with the case where the cleaning member does not rotate following the rotation of the charging member. can do.

  According to the charging device of the third aspect of the present invention, the second rotary shaft member is fixed to one end side, the outer peripheral surface abuts on the first rotary shaft member, and the one end portion of the second rotary shaft member is connected to the first rotary shaft member. Compared to the case where the eccentric cam that moves in the approaching / separating direction with respect to the axis of the second rotating shaft member is not provided, the one end side of the second rotating shaft member is simplified in the approaching / separating direction with respect to the axis of the first rotating shaft member It can be moved with.

  According to the charging device of the fourth aspect of the present invention, the first rotary shaft member is fixed to one end side, the outer peripheral surface abuts the one end side of the holding member, and the one end portion of the holding member is set to the axis of the first rotary shaft member. On the other hand, one end side of the holding member can be moved in the proximity / separation direction with a simple configuration with respect to the axis of the first rotary shaft member as compared with the case where the eccentric cam that moves in the proximity / separation direction is not provided. .

  According to the charging device of the fifth aspect of the present invention, the cleaning unit has a simple configuration in the charging unit as compared with the case where a plate member arranged so as to sandwich the cleaning unit between the charging unit and the charging unit is not provided. Can be contacted.

  According to the image carrier device of claim 6 of the present invention, the rotating shaft is provided on the surface of the image carrier as compared with the case where the charging device according to any one of claims 1 to 5 is not provided. It is possible to suppress charging unevenness that occurs along the direction.

  According to the image forming apparatus of the seventh aspect of the present invention, the toner formed on the surface of the image carrier as compared with the case where the charging device according to any one of the first to fifth aspects is not provided. In the image, density unevenness that occurs along the rotation axis direction can be suppressed.

  According to the image forming apparatus of the eighth aspect of the present invention, in the toner image formed on the surface of the image carrier as compared with the case where the image carrier device according to the sixth aspect is not provided, the rotation axis direction The density unevenness generated along the line can be suppressed.

(A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 1st Embodiment of this invention, the front view, and the side view from the other direction. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 1st Embodiment of this invention, the front view, and the side view from the other direction. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 1st Embodiment of this invention, the front view, and the side view from the other direction. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 1st Embodiment of this invention, the front view, and the side view from the other direction. It is the perspective view which showed the charging device which concerns on 1st Embodiment of this invention. It is the perspective view which showed the cleaning member with which the charging device which concerns on 1st Embodiment of this invention was equipped. 1 is a perspective view illustrating a charging roll provided in a charging device according to a first embodiment of the present invention. 1 is an enlarged side view showing a process cartridge according to a first embodiment of the present invention. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention. It is the conceptual diagram which showed the evaluation direction of the charging device which concerns on 1st Embodiment of this invention. It is drawing which showed the evaluation result of the charging device which concerns on 1st Embodiment of this invention with the graph. It is drawing which showed the evaluation result of the charging device which concerns on a comparison form with the graph with respect to the charging device which concerns on 1st Embodiment of this invention. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 2nd Embodiment of this invention, the front view, The side view from the other direction. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 2nd Embodiment of this invention, the front view, The side view from the other direction. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 2nd Embodiment of this invention, the front view, The side view from the other direction. (A) (B) (C) (D) It is the side view seen from one which showed the charging device etc. which concern on 2nd Embodiment of this invention, the front view, The side view from the other direction. It is the perspective view which showed the charging roll with which the charging device which concerns on 2nd Embodiment of this invention was equipped. It is the perspective view which showed the cleaning member with which the charging device which concerns on 2nd Embodiment of this invention was equipped.

  An example of a charging device, an image carrier device, and an image forming apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

(overall structure)
As shown in FIG. 9, the image forming apparatus 10 according to the embodiment of the present invention is, for example, a tandem full-color image forming apparatus 10. In each figure, the arrow UP indicates the upper side in the vertical direction.

  Inside the image forming apparatus 10, a cylindrical image carrier 12, a charging device 34 for charging the surface of the image carrier 12, and an electrostatic latent image formed on the surface of the image carrier 12, which will be described later, are toner. A process cartridge 18Y as an example of an image holding device for each color of yellow (Y), magenta (M), cyan (C), and black (K). 18M, 18C, and 18K are arranged in order from the upper direction to the lower direction. In the following description, when distinguishing between yellow (Y), magenta (M), cyan (C), and black (K), Y, M, C, and K are described after the reference numerals, and are particularly distinguished. If not, Y, M, C and K are omitted.

[Process cartridge and exposure equipment]
Each color process cartridge 18 is configured to be detachable from the image forming apparatus 10. Further, as the image carrier 12, for example, a conductive cylindrical body in which a photosensitive layer made of an organic photosensitive material or the like is coated on the outer peripheral surface (surface) is used, and the image carrier 12 is driven by a motor (not shown). It is designed to rotate.

  As shown in FIG. 8, the charging roll 14 as an example of a charging member provided in the charging device 34 is disposed so as to contact the outer peripheral surface of the image holding body 12, and the charging roll 14 is connected to the image holding body 12. The surface of the image carrier 12 is charged by rotating with the rotation.

  Further, as shown in FIG. 9, toward the outer peripheral surface of the image carrier 12 positioned on the downstream side in the rotation direction of the image carrier 12 (arrow D in the figure) with respect to the position where the charging roll 14 contacts. An exposure device 16 that is common to each color and emits a laser beam LB to expose the outer peripheral surface is arranged next to the process cartridge 18. The outer peripheral surface of the charged image carrier 12 is exposed by the laser beam LB emitted from the exposure device 16 so that an electrostatic latent image corresponding to image information is formed on the outer peripheral surface of the image carrier 12. It has become.

  Further, as shown in FIG. 8, the image carrier 12 is formed on the outer circumferential surface of the image carrier 12 on the downstream side in the rotation direction of the image carrier 12 with respect to the portion where the laser beam LB hits the outer circumferential surface of the image carrier 12. A developing device 24 is provided for developing the electrostatic latent image as a toner image of each color.

  Further, a cleaning blade that contacts the surface of the image carrier 12 and scrapes foreign matter from the surface of the image carrier 12 on the upstream side in the rotation direction (arrow D in the figure) of the image carrier 12 with respect to the charging roll 14. 26 is provided.

  For example, in the case of forming a full-color image, charging, exposure, and development processes are performed corresponding to each color of black (K), cyan (C), magenta (M), and yellow (Y), A toner image corresponding to each color of black (K), cyan (C), magenta (M), and yellow (Y) is formed on the outer peripheral surface of the image carrier 12 of each color. Details of the charging device 34 will be described later.

[Transfer device]
As shown in FIG. 9, tension is applied to the inside of the image forming apparatus 10 by the support roll 40 and the support roll 42 so as to be in contact with the outer peripheral surface of the image holding bodies 12 arranged in the vertical direction. An endless sheet conveying belt 20 supported from the inner peripheral surface side is provided. Further, on the opposite side of the image carrier 12 of each color across the paper conveyance belt 20, a sheet member P as a recording medium conveyed by the paper conveyance belt 20 is formed on the outer peripheral surface of the image carrier 12 of each color. Transfer rollers 22 for transferring the toner images of the respective colors are provided. As described above, the transfer device 36 that transports the sheet member P and transfers the toner image to the sheet member P includes the support roll 40, the support roll 42, the paper transport belt 20, and the transfer roll 22.

[Fixing device / discharge roll]
On the downstream side of the transfer direction of the sheet member P with respect to the transfer device 36 (hereinafter referred to as the sheet member transfer direction), the toner image transferred to the sheet member P is heated and pressed to be fixed to the sheet member P. A fixing device 48 is provided.

  Further, on the downstream side in the sheet member conveyance direction with respect to the fixing device 48, a discharge roll 44 for discharging the sheet member P on which the toner image is fixed is provided in a discharge portion 46 provided on the upper portion of the image forming apparatus 10. Yes.

[Paper storage container / conveying roll]
A sheet storage container 28 that stores a plurality of sheet members P is provided upstream of the transfer device 36 in the sheet member conveyance direction. Further, a take-out roll 30 for taking out the uppermost sheet member P from the paper storage container 28 is provided so as to be in contact with the uppermost sheet member P stored in the paper storage container 28. Further, on the downstream side in the sheet member conveyance direction with respect to the take-out roll 30, conveyance rolls 32 and 34 that deliver the sheet member P taken out by the take-out roll 30 to the paper conveyance belt 20 are provided.

(Main part configuration)
Next, the charging device will be described.

  As shown in FIG. 1C and FIG. 5, the charging device 34 contacts the above-described charging roll 14 and the charging roll 14, and is driven to rotate as the charging roll 14 rotates to clean the charging roll 14. A cleaning member 52 to be supported, a support device 54 as an example of a support means for supporting one end side of the cleaning member 52, and a guide device 56 as an example of a guide means to guide the other end side of the cleaning member 52. Yes.

[Charging roll]
As shown in FIGS. 5 and 7, the charging roll 14 that rotates with the rotation of the image carrier 12 includes a conductive first rotary shaft member 14 </ b> A that extends along the rotation axis direction of the image carrier 12, and The conductive elastic layer and the surface layer are provided with a charging layer 14B as an example of a charging portion formed in order around the first rotating shaft member 14A.

  As an example, the first rotating shaft member 14A is φ5 [mm] and is thinned. As described above, since the first rotating shaft member 14A is thinned, the center side of the first rotating shaft member 14A is bent in a state where the charging roll 14 is in contact with the surface of the image holding body 12, and the first rotating shaft member 14A is in contact with the image holding body 12. It is conceivable that a uniform pressure contact force (nip force) is not ensured.

  However, the charging layer 14B of the charging roll 14 of the present embodiment has a so-called crown shape in which the center side in the direction of the rotation axis is larger than the both end sides. Thereby, a uniform pressure contact force (nip force) is ensured between the charging roll 14 and the image carrier 12. Note that the crown shape of the charging layer 14B shown in each drawing is exaggerated so that the shape can be easily grasped.

As an example of the material of the first rotating shaft member 14A, free-cutting steel, stainless steel, or the like is used, and the material and surface treatment method are appropriately selected according to the use such as slidability, and the material does not have conductivity. Is processed by a general process such as a plating process, and a conductive process is performed.
The conductive elastic layer (not shown) constituting the charging layer 14B of the charging roll 14 is, for example, carbon black that adjusts the resistance of the conductive elastic layer using an elastic material such as rubber as a base material. Conductive materials such as ionic conductive materials, softeners, plasticizers, curing agents, vulcanizing agents, vulcanization accelerators, anti-aging agents, fillers such as silica and calcium carbonate, etc. can be added to rubber as needed. Materials are added as needed.

  The charged layer 14B is formed by coating the peripheral surface of the conductive first rotating shaft member 14A with a mixture obtained by adding a material usually added to rubber. Also, as a conductive agent for the purpose of adjusting the resistance value, a material in which a material that conducts electricity using at least one of electrons and ions as a charge carrier, such as carbon black and ionic conductive agent blended in a matrix agent, is used. be able to. Further, the elastic material serving as the base material of the charging layer 14B may be a foam.

  As an example, the elastic material serving as the base material of the charging layer 14B is formed by dispersing a conductive agent in a rubber material. Rubber materials include isoprene rubber, chloroprene rubber, epichlorohydrin rubber, butyl rubber, urethane rubber, silicone rubber, fluorine rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, ethylene propylene rubber, epichlorohydrin-ethylene oxide copolymer rubber, epichlorohydrin-ethylene oxide. -Allyl glycidyl ether copolymer rubber, ethylene-propylene-diene terpolymer rubber (EPDM), acrylonitrile-butadiene copolymer rubber, natural rubber, and blended rubbers thereof are used.

  Among these, silicone rubber, ethylene propylene rubber, epichlorohydrin-ethylene oxide copolymer rubber, epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer rubber, acrylonitrile-butadiene copolymer rubber, and blended rubbers thereof are preferably used. These rubber materials may be foamed or non-foamed.

  As the conductive agent, an electronic conductive agent or an ionic conductive agent is used. Examples of electronic conductive agents include carbon blacks such as ketjen black and acetylene black; pyrolytic carbon, graphite; various conductive metals or alloys such as aluminum, copper, nickel, stainless steel; tin oxide, indium oxide, titanium oxide Fine powders such as various conductive metal oxides such as tin oxide-antimony oxide solid solution and tin oxide-indium oxide solid solution; Examples of ionic conductive agents include perchlorates and chlorates such as tetraethylammonium and lauryltrimethylammonium; alkali metals such as lithium and magnesium, perchlorates and chlorates of alkaline earth metals, etc. Can be used.

  These conductive agents may be used alone or in combination of two or more. The amount of addition is not particularly limited, but in the case of an electronic conductive agent, it is preferably in the range of 1 to 60 parts by mass with respect to 100 parts by mass of the rubber material, while in the case of an ionic conductive agent, It is preferable that it is the range of 0.1-5.0 mass part with respect to 100 mass parts of rubber materials.

  The surface layer (not shown) constituting the charging layer 14B is formed to prevent contamination by foreign matters such as toner, and the surface layer is made of any material such as resin and rubber. There is no particular limitation. Examples include polyester, polyimide, copolymer nylon, silicone resin, acrylic resin, polyvinyl butyral, ethylene tetrafluoroethylene copolymer, melamine resin, fluoro rubber, epoxy resin, polycarbonate, polyvinyl alcohol, cellulose, polyvinylidene chloride, polychlorinated Vinyl, polyethylene, ethylene vinyl acetate copolymer and the like can be used.

  Of these, polyvinylidene fluoride, a tetrafluoroethylene copolymer, polyester, polyimide, and copolymer nylon are preferably used from the viewpoint of contamination due to external additives. The copolymer nylon includes one or more of 610 nylon, 11 nylon, and 12 nylon as polymerized units, and the other polymer units contained in the copolymer include 6 nylon. 66 nylon and the like. Here, the proportion of polymer units composed of 610 nylon, 11 nylon, and 12 nylon contained in the copolymer is preferably 10% or more in total by mass ratio. When the polymerization unit is 10% or more, the liquid preparation and the film formability at the time of applying the surface layer are excellent, and the wear of the resin layer and the adhesion of foreign matters to the resin layer are reduced especially during repeated use, and the durability of the roll is improved. Excellent, less change in properties due to the environment.

  Moreover, a polymeric material may be used independently and may be used in mixture of 2 or more types. The number average molecular weight of the polymer material is preferably in the range of 1,000 to 100,000, and more preferably in the range of 10,000 to 50,000.

  Furthermore, a conductive material is contained in the surface layer, and the resistance value can be adjusted. The conductive material preferably has a particle size of 3 μm or less.

  In addition, as a conductive agent for adjusting the resistance value, it conducts electrons and / or ions as charge carriers, such as carbon black, conductive metal oxide particles, or ionic conductive agent mixed in a matrix agent. What disperse | distributed material can be used.

  Specifically, carbon black as a conductive agent includes “Special Black 350”, “Special Black 100”, “Special Black 250”, “Special Black 5”, “Special Black 4” manufactured by Degussa, "Special Black 4A", "Special Black 550", "Special Black 6", "Color Black FW200", "Color Black FW2", "Color Black FW2V", "MONARCH1000" manufactured by Cabot, Cabot “MONARCH1300” manufactured by Co., Ltd., “MONARCH1400” manufactured by Cabot, “MOGUL-L”, “REGAL400R”, etc. are used.

  Carbon black has a pH of 4.0 or less, and has better dispersibility in the resin composition due to the effect of oxygen-containing functional groups present on the surface than general carbon black. By doing so, the charging uniformity can be improved, and the fluctuation of the resistance value can be further reduced.

  The conductive metal oxide particles that are conductive particles for adjusting the resistance value are particles having conductivity such as tin oxide, tin oxide doped with antimony, zinc oxide, anatase titanium oxide, ITO, etc. Any conductive agent using electrons as charge carriers can be used without any particular limitation. These may be used alone or in combination of two or more. Further, as long as the present embodiment is not hindered, any particle size may be used, but from the viewpoint of resistance value adjustment and strength, preferably tin oxide, antimony-doped tin oxide, anatase-type titanium oxide, Furthermore, tin oxide and tin oxide doped with antimony are preferred.

  By performing resistance control with such a conductive material, the resistance value of the surface layer does not change depending on environmental conditions, and stable characteristics can be obtained.

  Furthermore, a fluorine-based or silicone-based resin is used for the surface layer. In particular, the surface layer is preferably composed of a fluorine-modified acrylate polymer. Further, fine particles may be added to the surface layer. As a result, the surface layer becomes hydrophobic and acts to prevent the adhesion of foreign matter to the charging roll 14. Further, insulating particles such as alumina and silica are added to provide unevenness on the surface of the charging roll 14, thereby reducing the burden at the time of rubbing against the image holding body 12 and charging roll 14 and the image holding body. It is also possible to improve the mutual wear resistance.

[Cleaning member]
As shown in FIGS. 1 and 5, the cleaning member 52 is spirally wound around the second rotating shaft member 52A extending along the rotating shaft direction of the charging roll 14 and the outer peripheral surface of the second rotating shaft member 52A. And a cleaning unit 52B that cleans the charging roll 14 in contact with the rotating charging roll 14. This cleaning part 52B is formed of a foam. In addition, as a cleaning part, you may use a cylindrical thing instead of what was wound spirally around the outer peripheral surface of 52 A of 2nd rotating shaft members.

  The second rotating shaft member 52A is mainly made of metal such as aluminum, stainless steel, free-cutting steel, and the material and the surface treatment method are appropriately selected according to applications such as slidability and rust prevention. A non-conductive material may be processed by a general process such as a plating process and subjected to a conductive process, or may be used without being conductive.

  The material of the cleaning part 52B is selected from foamable resins such as polyurethane, polyethylene, polyamide or polypropylene, or NBR, EPDM, SBR, silicon rubber, or the like. The cleaning unit 52B efficiently cleans foreign substances such as external additives by driven sliding friction with the charging roll 14, and at the same time does not scratch the surface of the charging roll 14 due to rubbing of the cleaning unit 52B. In order to prevent tearing and breakage, polyurethane that is strong against tearing and pulling is particularly preferably used.

  The polyurethane is not particularly limited, and polyols such as polyester polyol, polyether polyol and acrylic polyol, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4-diphenylmethane diisocyanate, tolidine diisocyanate, 1 , 6-hexamethylene diisocyanate and the like may be involved, and it is preferable that a chain extender such as 1,4-butanediol and trimethylolpropane is further mixed.

  In general, foaming is performed using a foaming agent such as water, azodicarbonamide, azo compounds such as azobisisobutyronitrile. Further, auxiliary agents such as foaming aids, foam stabilizers, catalysts, etc. may be added as necessary.

  Since the cleaning part 52B is configured to wind the sheet spirally, after processing the foam into a sheet with a desired thickness, a double-sided tape is attached to the foam sheet, and the desired width and Process into strips of length. Thereafter, the cleaning member 52 is created by winding the strip-like sheet in a spiral manner while maintaining a certain angle in a state where tension is applied to the strip-like sheet on the second rotating shaft member 52A.

  As shown in FIGS. 5 and 6, a support device 54 is formed on one end side (left end side in the drawing) of the second rotary shaft member 52 </ b> A, and the outer peripheral surface is in contact with the first rotary shaft member 14 </ b> A and is second. An eccentric cam 60 that moves one end of the rotating shaft member 52A in the proximity and separation direction with respect to the axis of the first rotating shaft member 14A is fixed. The eccentric cam 60 is formed of a POM (polyacetal) material in consideration of slidability with the first rotating shaft member 14A.

[Supporting device]
As shown in FIGS. 1B and 1C, the support device 54 that supports one end of the cleaning member 52 includes a support member 66 that has a rectangular parallelepiped shape that supports one end of the second rotary shaft member 52 </ b> A. ing.

  A U groove 66A that supports one end portion of the second rotating shaft member 52A is formed at one end portion (upper end portion in the figure) of the support member 66. The U groove 66A is larger than the shaft diameter of the second rotary shaft member 52A. The width of the U groove 66A (the length L in the left-right direction shown in FIG. 1B) is such that one end (upper end in the drawing) of the rotating eccentric cam 60 hits the first rotating shaft member 14A. The second rotating shaft member 52A is determined to be movable in the width direction. Further, the other end portion (lower end portion in the figure) of the support member 66 is fixed with an end portion of a spring 68 that urges the eccentric cam 60 toward the first rotation shaft member 14A via the second rotation shaft member 52A. Has been. Although not provided in the present embodiment, a guide member that guides the rotation of the eccentric cam 60 may be provided.

  With this configuration, the eccentric cam 60 rotates as the cleaning member 52 rotates, so that the other end portion of the second rotating shaft member 52A moves in the approaching and separating direction with respect to the axis of the first rotating shaft member 14A. It is like that.

  A support member 62 that supports one end of the first rotary shaft member 14A is provided outside the support device 54 in the direction of the rotary shaft.

  A U groove 62A that supports one end of the first rotating shaft member 14A is formed at one end (upper end in the drawing) of the support member 62, and the other end (lower end in the drawing) of the support member 62 is formed. Is fixed to the end of the spring 64 that urges the first rotating shaft member 14A toward the image carrier 12 side.

[Guide device]
As shown in FIGS. 1C and 1D, the guide device 56 that guides the other end of the cleaning member 52 is, for example, a rectangular parallelepiped guide member that guides the other end of the second rotating shaft member 52A. 70.

  A U groove 70A that supports the other end of the first rotating shaft member 14A is formed at one end (upper end in the drawing) of the guide member 70, and the other end (lower end in the drawing) of the guide member 70. The end portion of the spring 72 that urges the first rotating shaft member 14 </ b> A toward the image carrier 12 is fixed.

  Further, the guide member 70 is formed with a through hole 70B extending in a direction in which the second rotary shaft member 52A approaches and separates from the first rotary shaft member 14A (hereinafter simply referred to as a close and separate direction). The other end of the second rotary shaft member 52A is movably inserted into 70B.

  With this configuration, the guide device 56 guides the other end side of the second rotating shaft member 52A so as to be movable in the approaching and separating directions.

  Further, as shown in FIG. 1C, when viewed from a direction orthogonal to the rotation axis direction and the approaching / separating direction (hereinafter referred to as an axis orthogonal direction), the second rotation shaft member 52A is provided with the first rotation axis. In a state of being arranged in parallel with the member 14A, at a position where the apex F of the crown-shaped charging layer 14B and the cleaning unit 52B face each other, the cleaning unit 52B contacts the apex F, and the cleaning unit 52B is compressed by a certain amount. It has come to be.

(Effects of main components)
Next, the operation of the main configuration will be described.

  As shown in FIG. 1C, when the second rotary shaft member 52A and the first rotary shaft member 14A are arranged in parallel when viewed from the direction orthogonal to the axis, the cleaning portion 52B has a crown shape. The charged layer 14B is compressed by a certain amount in contact with the vertex F of the charged layer 14B.

  At this time, as shown in FIG. 1B, one end portion (upper end portion in the figure) of the eccentric cam 60 hits the first rotating shaft member 14A, and one end portion of the second rotating shaft member 52A corresponds to the eccentric cam 60. It is eccentric in the near side direction in FIG. 1C with respect to the center (it is eccentric in the arrow-J direction in FIG. 1B).

  On the other hand, as shown in FIG. 1D, the other end of the second rotary shaft member 52A in the through hole 70B is disposed on the center side in the longitudinal direction of the through hole 70B.

  When the image carrier 12 is rotated in this state, the charging roll 14 is rotated with the rotation of the image carrier 12. Further, as the charging roll 14 rotates, the cleaning member 52 is driven to rotate. When the cleaning member 52 rotates, the eccentric cam 60 fixed to the second rotating shaft member 52A of the cleaning member 52 rotates.

  As shown in FIG. 2 (B), when the eccentric cam 60 rotates, one end portion (upper end portion in the figure) of the eccentric cam 60 contacts the first rotating shaft member 14A, and the second rotating shaft member 52A. One end is eccentric in the downward direction in the figure with respect to the center of the eccentric cam 60 (is eccentric in the direction of arrow -H in FIG. 2B).

  On the other hand, as shown in FIG. 2D, the other end portion of the second rotating shaft member 52A in the through hole 70B is one end side in the longitudinal direction of the through hole 70B (the arrow + H direction side in FIG. 2D). )

  As shown in FIGS. 2B and 2D, one end of the second rotating shaft member 52A moves in the arrow -H direction, and the other end of the second rotating shaft member 52A moves in the arrow + H direction. As shown in FIG. 2C, the rotating cleaning member 52 is inclined with respect to the charging roll 14. The inclined cleaning portion 52B contacts the inclined surface of the charging layer 14B on the right side in the drawing with respect to the apex F of the charging layer 14B, and the right inclined surface in the drawing is cleaned. Further, when the cleaning member 52 rotates, the eccentric cam 60 fixed to the second rotating shaft member 52A of the cleaning member 52 rotates.

  As shown in FIG. 3B, when the eccentric cam 60 rotates, one end portion (upper end portion in the figure) of the eccentric cam 60 hits the first rotary shaft member 14A, and the second rotary shaft member 52A One end portion is eccentric in the back direction of FIG. 3C with respect to the center of the eccentric cam 60 (eccentric in the arrow + J direction in FIG. 3B).

  On the other hand, as shown in FIG. 3D, the other end portion of the second rotating shaft member 52A in the through hole 70B moves to the center side in the longitudinal direction of the through hole 70B. As a result, as shown in FIG. 3C, the second rotary shaft member 52A and the first rotary shaft member 14A are arranged in parallel when viewed from the direction orthogonal to the axis, and the cleaning portion 52B has a crown shape. In contact with the apex F of the charged layer 14B. Further, when the cleaning member 52 rotates, the eccentric cam 60 fixed to the second rotating shaft member 52A of the cleaning member 52 rotates.

  As shown in FIG. 4B, when the eccentric cam 60 rotates, one end portion (upper end portion in the figure) of the eccentric cam 60 contacts the first rotating shaft member 14A, and the second rotating shaft member 52A One end portion is eccentric in the upward direction in the figure with respect to the center of the eccentric cam 60 (eccentric in the arrow + H direction in FIG. 4B).

  On the other hand, as shown in FIG. 4D, the other end portion of the second rotating shaft member 52A in the through hole 70B is the other end portion in the longitudinal direction of the through hole 70B (arrow -H in FIG. 4D). Move to the direction side).

  As shown in FIGS. 4B and 4D, one end of the second rotating shaft member 52A moves in the arrow + H direction, and the other end of the second rotating shaft member 52A moves in the arrow -H direction. Thus, as shown in FIG. 4C, the rotating cleaning member 52 is inclined with respect to the charging roll 14. The inclined cleaning portion 52B contacts the inclined surface of the left charging layer 14B in the drawing with respect to the apex F of the charging layer 14B, and the left inclined surface in the drawing is cleaned.

  Further, when the cleaning member 52 rotates, the eccentric cam 60 fixed to the second rotating shaft member 52A of the cleaning member 52 rotates. When the eccentric cam 60 rotates, the second rotating shaft member 52A of the cleaning member 52 is disposed in parallel with the first rotating shaft member 14A, as shown in FIG.

  Thus, the operation | movement demonstrated above arises in order by rotating the cleaning member 52 and rotating the eccentric cam 60. FIG. That is, the rotating cleaning member 52 swings around the vertex F of the charging layer 14B having a crown shape, and the right inclined surface of the charging layer 14B shown in FIG. 1C and the left side of the charging layer 14B. Alternately contact with the inclined surface.

  As a result, dirt such as toner and external additives adhering to the inclined surfaces on both sides of the charging layer 14B is transferred or scraped to the cleaning unit 52B side, so that uneven cleaning that occurs along the rotation axis direction of the charging roll 14 occurs. It is suppressed.

  Here, the cleaning performance for the charging roll was evaluated using the cleaning member 52 as an example and the cleaning member as a comparative example.

〔Example〕
[Charging roll]
After adding 3 parts by mass of ionic conductive agent PEL-100 (manufactured by Nippon Carlit Co., Ltd.) to 100 parts by mass of epichlorohydrin rubber and sufficiently kneading it, it was extruded and molded into a first rotating shaft member 14A of φ5 [ mm] (L = 245 mm) and inserted into a SUM-Ni shaft (free-cutting steel (Nippon Steel SUM24EZ) plated with Ni).

  In this state, vulcanization was performed with a press molding machine, and then processing was performed by polishing to obtain an end outer diameter φ6.90 [mm] and a central outer diameter φ7.05 [mm] (crown amount 150 μm). . Thereafter, this surface was coated with a fluororesin with a film thickness of 5 μm by a dip coating method to obtain a charged layer 14B.

  The charging roll 14 obtained in such a process was used for evaluation.

[Cleaning member / Eccentric cam]
Polyether and isocyanate were mixed, and the obtained urethane resin was heated and cured, and a urethane material (SM55 manufactured by INOAC) having a three-dimensional network structure was processed into a square of 12 mm. A hot-melt adhesive is applied to the φ4 [mm] part of the second rotating shaft member 52A in which Ni plating is applied to φ4 [mm] free-cutting steel (Nippon Steel SUM24EZ) with both ends stepped to φ3 [mm]. The coated material was inserted into the above-mentioned square bar, heat-bonded, and then processed by grinding so that the outer diameter of the urethane part (cleaning part 52B) became a roll shape having a diameter of 6 mm.

  The cleaning member 52 obtained in such a process was used for evaluation. As described above, as the cleaning unit 52B of the example, a cylindrical member was used instead of a spiral material wound around the outer peripheral surface of the second rotating shaft member 52A.

  Thereafter, an eccentric cam 60 (made by POM) having an outer diameter of 7.5 [mm] whose center is eccentric by 0.2 [mm] was press-fitted into one end side (φ3 [mm] portion) of the second rotary shaft member 52A. .

[Comparative example (conventional example)]
[Charging roll]
The same charging roll 14 as in Example 1 was used.

[Cleaning member]
With respect to the cleaning member used in the example, the step of φ3 [mm] formed at both ends of the second rotating shaft member is abolished, and further, an eccentric cam is not used.

  In addition, the second rotating shaft member of the cleaning member is parallel to the first rotating shaft member of the charging roll, and the first rotating shaft member and the first rotating shaft member are positioned at a position where the amount of biting into the charging roll of the cleaning unit is 0.3 [mm]. The distance between the shafts of the two rotating shaft members was determined.

〔Evaluation method〕
The charging roll and the cleaning member according to the example and the comparative example were incorporated in a process cartridge of CELL 1103cn manufactured by DELL. This process cartridge was attached to a CELL C3110Ccn manufactured by DELL, and a continuous printing test was performed.

  The cleaning member 52 of the example was supported so as to be swingable as described in the embodiment, and the cleaning member of the comparative example was supported not to swing.

  Further, both ends of the first rotating shaft member of the charging rolls of Examples and Comparative Examples were pressed against the image carrier (electrophotographic photosensitive member) with a force of 4.5 [N] using a spring.

  Furthermore, under three environments of room temperature 10 ° C., humidity 15% RH, room temperature 22 ° C., humidity 55% RH, room temperature 28 ° C., humidity 85% RH, the area on A4 paper is divided into four parts in parallel with the paper feed direction. A chart in which an image density of 5% of each color of yellow, magenta, cyan, and black (image existence ratio per image) is formed in an area is first 1000 sheets in an environment of room temperature 22 ° C. and humidity 55% RH, and then Output 2,000 sheets under the environment of room temperature 10 ° C and humidity 15% RH, 2000 sheets under the environment of room temperature 28 ° C and humidity 85% RH, and finally 1000 sheets under the environment of room temperature 22 ° C and humidity 55% RH. Then, the contamination state of the surface of the charging roll after outputting 8,000 sheets was evaluated.

  As an evaluation method, visual observation and magnified observation were performed. In order to quantify the contamination state on the surface of the charging roll, the contamination state was observed, and then evaluation was performed using the apparatus shown in FIG. Specifically, as shown in FIG. 10, a voltage of 100 [Vdc] is applied to the bearing electrode 90 having a width (length in the depth direction of the paper) of 5 [mm] in an environment of a room temperature of 22 ° C. and a humidity of 55% RH. The bearing electrode 90 was moved from one end to the other end of the surface of the charging roll at a speed of 10 [mm / s]. The current value flowing during this movement was sampled and converted to a resistance value. The larger the resistance value, the more contaminated the surface of the charging roll.

  Further, regarding the current value, the charging roll was fixed and collected (at 0 degree), and then the charging roll was rotated around the first rotating shaft member by 180 degrees and collected again (at 180 degrees).

〔Evaluation results〕
As a result of visual observation and magnified observation, the surface of the charging roll 14 according to the example was not contaminated than the surface of the charging roll according to the comparative example.

  FIG. 11 is a graph showing the result of evaluating the charging roll 14 according to the example using the apparatus (see FIG. 10), and FIG. 12 is a comparative example using the apparatus (see FIG. 10). The result of evaluating such a charging roll is described in a graph.

  In each graph, the vertical axis indicates the common logarithm value [Log-Ω] of the resistance value, and the horizontal axis indicates a measurement position where one end portion in the axial direction of the charging roll is 0 [mm]. Further, the solid line in the graph indicates the resistance value collected at 0 degrees, and the broken line indicates the resistance value collected at 180 degrees.

  As shown in FIG. 11, in the charging roll 14 of the example, the difference in resistance value between the center side and both ends of the charging roll 14 is smaller than that of the charging roll of the comparative example shown in FIG. It can be seen that cleaning unevenness that occurs along the direction of the rotational axis 14 is suppressed.

  As can be seen from the above evaluation results, in this embodiment, even when the charging layer 14B of the charging roll 14 has a so-called crown shape, uneven cleaning that occurs along the rotation axis direction of the charging roll 14 occurs. It is suppressed.

  In addition, by suppressing the uneven cleaning that occurs along the rotation axis direction of the charging roll 14, the uneven charging that occurs along the rotation axis direction of the surface of the image carrier 12 is suppressed.

  Further, by suppressing the uneven charging that occurs along the rotation axis direction of the surface of the image holding body 12, the charging unevenness that occurs along the rotation axis direction of the toner image formed on the surface of the image holding body 12 is caused. Density unevenness is suppressed.

  Further, by providing the eccentric cam 60, one end side of the second rotating shaft member 52A moves in a proximity and separation direction with respect to the axis of the first rotating shaft member 14A as compared with the case where the eccentric cam is not used. To do.

  An example of the charging device, the image holding device, and the image forming apparatus according to the second embodiment of the present invention will be described with reference to FIGS. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 13 and 17, the cleaning member 110 provided in the charging device 102 according to the second embodiment is not provided with an eccentric cam, and is instead provided in the charging roll 14. An eccentric cam 114 constituting a support device 112 as an example of a support means is fixed to one end side of the first rotating shaft member 14A.

[Cleaning member]
As shown in FIGS. 13 and 18, the cleaning member 52 includes a rectangular plate-shaped plate member 110 </ b> A extending along the rotation axis direction of the charging roll 14, and a charging roll that is fixed to the plate surface of the plate member 110 </ b> A and rotates. 14 and a cleaning unit 110B formed of a foam that cleans the charging roll 14 in contact with it. That is, the plate member 110A is disposed so as to sandwich the cleaning unit 110B with the charging layer 14B.

  In addition, the outer peripheral surface of the eccentric cam 114 described above hits a portion where the cleaning portion 110B is not provided on one end side of the plate member 110A.

[Supporting device]
As shown in FIGS. 13B and 13C, the support device 112 that supports one end of the cleaning member 110 includes a support member 118 that has a rectangular parallelepiped shape that supports one end of the plate member 110A.

  A recess 118A that supports one end of the plate member 110A is formed at one end of the support member 118 (upper end in the figure). Further, the end of the spring 120 that urges the plate member 110 </ b> A toward the eccentric cam 114 is fixed to the other end (lower end in the drawing) of the support member 66.

[Guide device]
As shown in FIGS. 13C and 13D, the guide device 124 as an example of the guide means for guiding the other end side of the cleaning member 110 has a rectangular parallelepiped shape for guiding the other end portion of the plate member 110A. A guide member 126 is provided.

  A U groove 126A that supports the other end of the first rotating shaft member 14A is formed at one end (upper end in the figure) of the guide member 126, and the other end (lower end in the figure) of the guide member 126. The end of a spring 128 that urges the first rotating shaft member 14A toward the image carrier 12 is fixed.

  The guide member 126 is formed with a rectangular through hole 126B, and the other end of the plate member 110A is inserted into the through hole 126B so as to be movable in the proximity and separation direction.

  Further, as shown in FIG. 13C, when the plate member 110A is disposed in parallel with the first rotation shaft member 14A when viewed from the direction orthogonal to the rotation axis direction and the approaching and separating direction, At a position where the apex F of the charging layer 14B having a crown shape and the cleaning unit 110B face each other, the apex F and the cleaning unit 110B come into contact with each other, and the cleaning unit 110B is compressed by a certain amount.

(Function)
As shown in FIG. 13C, when the plate member 110A and the first rotation shaft member 14A are arranged in parallel when viewed from the direction orthogonal to the rotation axis direction and the approaching / separating direction, the cleaning unit 110B comes into contact with the apex F of the charging layer 14B having a crown shape and is compressed by a certain amount.

  At this time, as shown in FIG. 13B, the plate surface on one end side of the plate member 110A hits the outer peripheral surface of the eccentric cam 114 from below in the drawing by the biasing force of the spring 120, and the center of the eccentric cam 114 is It is eccentric in the back direction of FIG. 13C with respect to one end portion of the first rotating shaft member 14A (eccentric in the arrow + J direction of FIG. 13B).

  On the other hand, as shown in FIG. 13D, the other end portion of the plate member 110A in the through hole 126B is disposed on the center side in the approaching / separating direction in the through hole 126B.

  When the image carrier 12 is rotated in this state, the charging roll 14 is rotated with the rotation of the image carrier 12. Further, the eccentric cam 114 rotates as the charging roll 14 rotates.

  As shown in FIG. 14B, when the eccentric cam 114 rotates, the plate surface on one end side of the plate member 110A hits the outer peripheral surface of the eccentric cam 114 from below in the figure by the biasing force of the spring 120. The center of the eccentric cam 114 is eccentric in the lower direction in the figure with respect to one end of the first rotating shaft member 14A (decentered in the direction of arrow -H in FIG. 14B).

  On the other hand, as shown in FIG. 14D, the other end of the plate member 110A in the through hole 126B is on the upper end side in the drawing (arrow + H direction side in FIG. 14D) in the through hole 126B. Moving.

  As shown in FIGS. 14B and 14D, the center of the eccentric cam 114 at one end of the plate member 110A is eccentric in the downward direction in the figure with respect to one end of the first rotating shaft member 14A. The other end of the plate member 110A moves upward in the drawing within the through hole 126B. As a result, as shown in FIG. 14C, the cleaning member 110 whose one end contacts the outer peripheral surface of the eccentric cam 114 is inclined with respect to the charging roll 14. The inclined cleaning unit 110B contacts the inclined surface of the charging layer 14B on the right side in the drawing with respect to the vertex F of the charging layer 14B, and the right inclined surface in the drawing is cleaned. Further, when the charging roll 14 rotates, the eccentric cam 114 fixed to the first rotating shaft member 14A of the charging roll 14 rotates.

  As shown in FIG. 15B, when the eccentric cam 114 rotates, the plate surface on one end side of the plate member 110A hits the outer peripheral surface of the eccentric cam 114 from below in the figure by the biasing force of the spring 120. The center of the eccentric cam 114 is eccentric in the front side direction of FIG. 15C with respect to one end portion of the first rotating shaft member 14A (decentered in the arrow-J direction of FIG. 15B).

  On the other hand, as shown in FIG. 15D, the other end of the plate member 110A in the through hole 126B moves to the center side in the approaching / separating direction in the through hole 126B. As a result, as shown in FIG. 15C, the plate member 110A and the first rotating shaft member 14A are arranged in parallel, and the cleaning unit 110B comes into contact with the vertex F of the charging layer 14B having a crown shape. . Further, when the charging roll 14 rotates, the eccentric cam 114 fixed to the first rotating shaft member 14A of the charging roll 14 rotates.

  As shown in FIG. 16B, when the eccentric cam 60 rotates, the plate surface on one end side of the plate member 110A hits the outer peripheral surface of the eccentric cam 114 from below in the figure by the biasing force of the spring 120. The center of the eccentric cam 114 is eccentric in the upward direction in the figure with respect to one end portion of the first rotating shaft member 14A (decentered in the arrow + H direction in FIG. 16B).

  On the other hand, as shown in FIG. 16D, the other end portion of the plate member 110A in the through hole 126B is the lower side in the drawing in the through hole 126B (the arrow-H direction side in FIG. 16D). Move to.

  As shown in FIGS. 16B and 16D, the center of the eccentric cam 114 on one end side of the plate member 110A is eccentric in the upward direction in the drawing with respect to one end portion of the first rotating shaft member 14A, and the plate The other end of the member 110A moves downward in the drawing in the through hole 126B. Thereby, as shown in FIG. 16C, the cleaning member 110 whose one end contacts the outer peripheral surface of the eccentric cam 114 is inclined with respect to the charging roll 14. The inclined cleaning unit 110B contacts the inclined surface of the left charging layer 14B in the drawing with respect to the apex F of the charging layer 14B, and the left inclined surface in the drawing is cleaned.

  Further, when the charging roll 14 rotates, the eccentric cam 114 fixed to the first rotating shaft member 14A of the charging roll 14 rotates. When the eccentric cam 114 rotates, as shown in FIG. 13, the plate member 110A of the cleaning member 110 moves so as to be parallel to the first rotating shaft member 14A.

  Thus, by rotating the eccentric cam 114, the operations described above occur in order. That is, the plate-shaped cleaning member 110 swings around the vertex F of the charging layer 14B having a crown shape, and the right inclined surface of the charging layer 14B shown in FIG. 13C and the charging layer 14B. Alternating contact with the left inclined surface.

  As a result, dirt such as toner and external additives attached to the inclined surfaces on both sides of the charging layer 14B is transferred or scraped to the cleaning unit 52B side, and cleaning unevenness that occurs along the rotation axis direction of the charging roll 14 is suppressed. Is done.

  As described above, even when the charging layer 14B of the charging roll 14 has a so-called crown shape, cleaning unevenness that occurs along the rotation axis direction of the charging roll 14 is suppressed without rotating the cleaning member 110. Is done.

  Further, by providing the plate member 110 </ b> A so as to sandwich the cleaning unit 110 </ b> B with the charging roll 14, the cleaning unit 110 </ b> B contacts the charging roll 14 with a simple configuration. Other operations are the same as those in the first embodiment.

  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 are possible within the scope of the present invention. It is clear to the contractor. For example, in the above-described embodiment, the process cartridge 18 is configured to include the image carrier 12, the charging device 34, and the developing device 24. However, if the process cartridge 18 includes the image carrier 12 and the charging device 34. Of course, the configuration may not include other devices.

  Moreover, in the said 1st Embodiment, although the cleaning part 52B of the cleaning member 52 was set as the structure wound helically around the outer peripheral surface of 52 A of 2nd rotating shaft members, it is not limited to this structure in particular, The cleaning part May be cylindrical or the like.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Image holding body 14 Charging roll (an example of charging member)
14A First rotating shaft member 14B Charging layer (an example of a charging unit)
16 Exposure device 18 Process cartridge (an example of an image carrier device)
24 developing device 52 cleaning member 52A second rotating shaft member (an example of holding member)
52B Cleaning unit 54 Support device (an example of support means)
56 Guide device (an example of guide means)
60 Eccentric cam 102 Charging device 110 Cleaning member 110A Plate member (an example of a holding member)
110B Cleaning unit 112 Support device (an example of support means)
114 Eccentric cam 124 Guide device (an example of guide means)

Claims (8)

A rotating image carrier, comprising: a first rotating shaft member; and a charging portion that is provided on an outer peripheral surface of the first rotating shaft member and has an axially central side having a larger diameter than both axially opposite ends. A charging member that contacts the charging unit and rotates with the rotation of the image carrier to charge the surface of the image carrier;
A cleaning member comprising a cleaning unit that extends along a rotation axis direction of the first rotation shaft member, contacts the charging unit to clean the charging unit, and a holding member that holds the cleaning unit;
One end of the holding member is provided on one end side of the holding member so that the one end of the holding member is moved in the proximity and separation direction with respect to the axis of the first rotating shaft member as the charging member rotates. Support means for supporting the side;
A guide means provided on the other end side of the holding member for guiding the other end side of the holding member so as to be movable toward and away from the axis of the first rotary shaft member;
A charging device comprising: The holding member is a second rotation shaft member extending along the rotation axis direction of the first rotation shaft member,
The cleaning portion is provided on the outer peripheral surface of the second rotating shaft member,
The charging device according to claim 1, wherein the cleaning member is driven to rotate as the charging member rotates.   The support means is fixed to one end side of the second rotary shaft member, and an outer peripheral surface abuts on the first rotary shaft member, and one end portion of the second rotary shaft member as the second rotary shaft member rotates. 3. The charging device according to claim 2, further comprising an eccentric cam that moves the first rotational shaft member in a proximity and separation direction with respect to an axis of the first rotary shaft member.   The support means is fixed to one end side of the first rotary shaft member, and an outer peripheral surface abuts on one end side of the holding member, and the one end portion of the holding member is moved to the first side as the first rotary shaft member rotates. The charging device according to claim 1, further comprising an eccentric cam that moves in a direction of approaching and separating with respect to an axis of the one rotation shaft member.   The charging device according to claim 4, wherein the holding member is a plate member disposed so as to sandwich the cleaning unit between the charging unit and the charging unit. A rotating image carrier;
The charging device according to any one of claims 1 to 5, further comprising a charging member that contacts the image carrier and rotates with the rotation of the image carrier to charge the surface of the image carrier.
An image carrier apparatus comprising: A rotating image carrier;
The charging device according to any one of claims 1 to 5, further comprising a charging member that contacts the image carrier and rotates with the rotation of the image carrier to charge the surface of the image carrier.
An exposure device that exposes the surface of the image carrier charged by the charging device to form an electrostatic latent image; and
A developing device for developing, as a toner image, an electrostatic latent image formed on the surface of the image carrier by the exposure device;
An image forming apparatus comprising: An image carrier device according to claim 6;
An exposure device that exposes the surface of the image carrier charged on the surface of the image carrier device to form an electrostatic latent image; and
A developing device for developing, as a toner image, an electrostatic latent image formed on the surface of the image carrier by the exposure device;
An image forming apparatus comprising:

Images