JP5262071B2 - Charging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain electrifying performance in a good condition by efficiently cleaning a member, for example, a shielding case covering an electrifying member, electrifying voltage being applied between a body to be electrified and the electrifying member, in an electrifying device which electrifies the body to be electrified by corona discharge. <P>SOLUTION: A cleaning unit 50 moving in an axial direction of an electrode wire 33 (electrifying member) is provided inside the shielding case 34 covering the electrode wire 33. The cleaning unit is equipped with a support body 36 driven to move back and forth along the electrode wire, and a rubbing member 41 coming into contact with the inner wall of the shielding case is attached to the support body. The inside of the shielding case is cleaned by the rubbing member as the support body is moved. An adhesive matter storing part 42 collecting a peeled adhesive matter and an adhesive matter receiving part 43 receiving the peeled adhesive matter so as not to drop onto the body to be electrified 1 are provided on the support body 36. A scattering suppressing member 54 suppressing scattering of the collected adhesive matter is attached inside the adhesive matter storing part. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a charging device that charges a member to be charged by corona discharge generated between the member to be charged and an electrode disposed opposite thereto.

  A charging device using corona discharge is used, for example, in an electrophotographic image forming apparatus to charge an image carrier on which a latent image is formed by a difference in electrostatic potential to a predetermined potential. In a charging device used for such a purpose, a strong electric field is generated between a charging member such as a stretched wire and an image holding member to be charged, and corona discharge is generated. Particles having a charge such as may adhere to the charging member. In addition, discharge products such as ozone and nitrogen oxides may adhere to the charging member. If such deposits are present, the charging characteristics may be deteriorated, and the deposits need to be removed from the charging member.

For example, Patent Literature 1 and Patent Literature 2 describe a charging device including a cleaning member for removing deposits from a charging member.
These charging devices include a wire stretched in parallel to the surface of the object to be charged and a shield case provided so as to surround the wire, and includes a cleaning member that moves in the axial direction of the wire within the shield case. ing. This cleaning member is pressed against a wire which is a charging member, and is moved and rubbed to remove foreign matter attached to the wire.

  On the other hand, toner and discharge products also adhere to the shield case. The discharge light generated between the charging member and the member to be charged is reflected inside the shield case and affects the charging characteristics of the member to be charged. May cause uneven charging. The discharge light is uniformly reflected when there is no deposit inside the shield case, and the charged object is charged uniformly regardless of the influence of the reflected light. The discharged light is not uniform, and uneven charging occurs. This is one of the causes for reducing the quality of the formed image.

In order to eliminate such uneven charging, Patent Literature 3 and Patent Literature 4 describe a charging device having a configuration for cleaning the inside of a shield case. In these charging devices, a holding member that moves in the axial direction of the charging member includes a cleaning member that rubs against the charging member and a cleaning member that rubs against the inner surface of the shield case. As the cleaning member that is rubbed against the inner surface of the shield case, a cylindrical member or a pad-like member that is rotated and rubbed against the shield case is used.
JP 2003-345111 A JP 2006-126659 A JP-A-1-287682 Japanese Patent Laid-Open No. 4-50971

  In the charging device having the cleaning member that is rubbed against the inner surface of the shield case as described above, the cleaning member moves in the axial direction of the charging member when a voltage that causes corona discharge is not applied to the charging member, and the shield Toner and discharge products adhering to the inner surface of the case are peeled off and removed. However, the deposits peeled off from the inner surface of the shield case may fly up and scatter due to the airflow accompanying the movement of the cleaning member. If the scattered toner and discharge products adhere to the shield case again, the cleaning efficiency is deteriorated. Further, the deposits peeled off from the inner surface of the shield case may fall on the member to be charged and contaminate the surface of the member to be charged.

  The present invention has been made in view of the circumstances as described above, and its purpose is to efficiently clean and remove the inner surface of a shield case, for example, a shield case, surrounding the periphery of the charging member. It is an object of the present invention to provide a charging device capable of suppressing scattering of adhered matter and adhesion to an object to be charged.

In order to solve the above-mentioned problems, the invention according to claim 1 has a shape that is long and continuous in one direction with a predetermined interval from the surface of the object to be charged, and is used for charging between the object to be charged. a charging member to which a voltage is applied, the charging member in the axial direction, a cover member provided to cover the rear and side against the member to be charged, the cover moves in the axial direction of said charging member A cleaning unit that removes deposits on the inner surface of the member, the cleaning unit being driven to reciprocate along the charging member from a standby position , supported by the support, A rubbing member that comes into contact with the inside of the covering member and peels off the adhering matter ; and a front side and a rear side in the direction in which the support in the range where the rubbing member is provided on the support travels from the standby position Formed in at least one of the concave It has a deposit storage portion for storing deposit peeled by friction members, wherein the deposit receiving section, a portion adjacent to the rubbing member, the contact surface between the covering member of the sliding friction member The charging device is formed by further retracting and providing a wall-like convex portion protruding toward the covering member at a position separated from the rubbing member on the front side or the rear side of the rubbing member. I will provide a.

According to a second aspect of the present invention, there is provided a charging member having a shape which is long and continuous in one direction with a predetermined distance from the surface of the member to be charged, and a charging voltage is applied between the member to be charged. A covering member provided so as to cover the back and sides of the charging member along the axial direction of the charging member; and moving in the axial direction of the charging member to remove deposits on the inner surface of the covering member. A cleaning unit, wherein the cleaning unit is driven to reciprocate along the charging member from a standby position, and is supported by the support and in contact with the inside of the covering member. An inner surface of the side portion between an edge of the cover member facing the charged body and a side edge of the covering member facing the charged body; It provided so as to straddle the extended surface of the front from the side portions Providing a charging apparatus having a deposit receiving portion for receiving the deposits to fall to be charged side, a.

The invention according to claim 3 is the charging device according to claim 1, wherein the deposit receptacle made of a material that integrates a porous material or fibers, the contained deposits stoma or between fibers It is assumed that a scattering suppressing member that is taken in and suppresses scattering is attached.

  According to a fourth aspect of the present invention, in the charging device according to any one of the first to third aspects, the rubbing member provided on the inner surface of the covering member is in contact with the moving rubbing member, It shall have a scraping member which scrapes off the deposit | attachment adhering to the member from this rubbing member.

  The invention according to claim 5 is the charging device according to claim 4, further comprising an air introduction path for introducing air flowing in one direction with respect to the axial direction of the charging member at a position along the charging member. The scraping member is provided downstream of the air flow.

  The invention according to claim 6 is the charging device according to any one of claims 1 to 5, wherein the rubbing member is a synthetic resin foam containing abrasive fine powder, or an abrasive. And a pad on which fibers containing the fine powder are accumulated.

  With the above configuration, in the charging device according to the first aspect of the present invention, when the support provided in the cleaning unit moves in the axial direction of the charging member along the charging member, the rubbing member Peels off foreign matter such as toner and discharge products adhering to the inside of the cover member, and collects the peeled foreign matter in a deposit storage part provided on the support, and then scatters or drops onto the charged body Can be suppressed.

In the charging device according to the second aspect of the present invention, the foreign matter peeled off from the inner surface of the covering member falls along the inner surface of the covering member, and falls on the charged body side from the edge facing the charged body. It can be accommodated in the portion and can be prevented from adhering to the body to be charged.

  In the charging device of the invention according to claim 3, the foreign matter peeled off from the covering member and collected in the deposit housing part is taken in between a large number of pores of the porous material or between the fibers of the material in which the fibers are accumulated, Scattering is suppressed and the fall to the member to be charged is suppressed.

  In the charging device according to the fourth aspect of the present invention, among the foreign matter peeled from the covering member by the rubbing member, the foreign matter adhering to the rubbing member without being accommodated in the adhering matter accommodating portion is scraped off and removed. The cleaning performance of the rubbing member can be maintained. Further, it is possible to remove foreign matters remaining on the rubbing member with a series of operations for cleaning the covering member.

  In the charging device according to the fifth aspect of the present invention, the foreign matter attached to the rubbing member is removed at the downstream portion of the air flow, so that the foreign matter removed from the rubbing member is placed inside the covering member or around the charged body. Can be prevented from being scattered. Further, by removing the foreign matter remaining on the rubbing member after the covering member has been cleaned, the rubbing member can be brought into a state where the cleaning performance has been recovered at the start of the next cleaning.

  In the charging device according to the sixth aspect of the present invention, even if there is a foreign substance strongly adhering to the inner surface of the covering member, it can be peeled off by the abrasive.

Hereinafter, embodiments of the invention according to the present application will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an image forming apparatus including a charging device according to an embodiment of the present invention.
The image forming apparatus includes four image forming units 10a, 10b, 10c, and 10d that form yellow, magenta, cyan, and black toner images, and is endless so as to face each of these image forming units 10. A belt-like intermediate transfer member 11 is supported, and the peripheral surface moves around. On the downstream side of the position facing the image forming unit in the movement direction of the peripheral surface, a transfer roll 12 for performing secondary transfer is disposed so as to face the intermediate transfer body 11, and this secondary transfer portion The recording sheet is fed from the sheet tray 13 through the conveyance path 14. A fixing device 15 that heats and pressurizes the toner image and presses the toner image onto the recording sheet is provided downstream of the secondary transfer portion in the recording sheet conveyance path, and the toner image is fixed further downstream. A paper discharge tray 16 for storing the recorded sheet is provided.

  Each of the image forming units 10a, 10b, 10c, and 10d has a photosensitive drum 1 on the surface of which an electrostatic latent image is formed, and around each photosensitive drum 1, the photosensitive drum 1 is provided. A charging device 2 that charges the surface almost uniformly, a developing device 3 that forms a toner image by selectively transferring toner to a latent image formed on the photosensitive drum, and a toner image on the photosensitive drum 1 The image forming apparatus includes a transfer device 4 that primarily transfers the toner onto the intermediate transfer member 11 and a cleaning device 5 that collects toner remaining on the photosensitive drum 1 after the transfer. An image exposure device 6 for writing an electrostatic latent image by irradiating each uniformly charged photosensitive drum 1 with image light based on an image signal is provided.

  The charging device 2 includes an electrode wire 33 that is stretched at a predetermined interval from the peripheral surface of the photosensitive drum 1 that is a member to be charged, and a voltage is applied between the electrode wire 33 and the photosensitive drum 1. Is applied to cause corona discharge to charge the surface of the photosensitive drum 1. Details of the charging device will be described later.

  The image exposure device 6 generates a flashing laser beam based on an image signal, and scans this in the main scanning direction (axial direction) of each photosensitive drum 1 by a polygon mirror. As a result, electrostatic latent images corresponding to the images of the respective colors are formed on the surfaces of the respective photosensitive drums 1.

  The developing device 3 uses a two-component developer containing toner and a magnetic carrier as a developer, and is magnetically attracted to and conveyed by a developing roll facing the photosensitive drum 1. Then, a layer having an appropriate thickness is formed on the developing roll by a regulating blade and supplied to a position facing the photosensitive drum 1. A developing bias voltage is applied to the developing roll in order to transfer the toner to the electrostatic latent image on the photosensitive drum 1.

  The photosensitive drum 1 is formed by forming a photoconductive layer of an organic component on the peripheral surface of a cylindrical member made of metal, and the metal portion is electrically grounded. Further, a bias voltage may be applied.

The intermediate transfer body 11 disposed so as to face the image forming units 10a, 10b, 10c, and 10d is made of a resin film having a thickness of about 10 to 300 μm, and a polyimide film or the like is used. In addition, the resin film is mixed with powder of a conductive material such as carbon black so that the image is not disturbed when the toner image is electrostatically transferred from the photosensitive drum 1 to the intermediate transfer body 11. The volume resistivity is adjusted to about 10 ¹⁰ Ωcm.

  Inside the intermediate transfer body 11, a drive roll 17, an opposing roll 18, and a support roll 19 are arranged. The intermediate transfer body 11 is stretched around these and moves in the direction of arrow A shown in the figure. It is supposed to be.

  The transfer roll 12 is provided at a position facing the facing roll 18 and is pressed against the facing roll 18 via the intermediate transfer body 11. The transfer roll 12 is a roll formed by covering a metal core material with a conductive rubber material on the outer periphery, and a bias voltage for transfer is applied between the opposite roll 18. .

The image forming apparatus operates as follows.
When a signal for starting an image forming operation is input, yellow, magenta, cyan, and black toners are respectively input to the four image forming units 10a, 10b, 10c, and 10d provided to face the intermediate transfer body 11. An image is formed. The toner image is formed by the following process.
Each of the photosensitive drums 1 is charged almost uniformly by the charging device 2, and laser light that is turned on / off in accordance with an image signal is emitted from the image exposure device 6. As a result, the charge at the position irradiated with light is attenuated, and a latent image is formed on the photosensitive drum 1 due to the difference in electrostatic potential. The electrostatic latent image on each photosensitive drum 1 is developed by toner transfer at a position facing the developing device 3, and a toner image is formed on the photosensitive drum 1.

  The formed color toner images are transferred onto the intermediate transfer body 11 in a superimposed manner by the transfer device 4. As a result, a color image in which a plurality of color toner images are superimposed on the intermediate transfer body 11 is formed. The toner images of a plurality of colors formed on the intermediate transfer member 11 are conveyed to a secondary transfer unit facing the transfer roll 12 by the circumferential movement of the intermediate transfer member 11.

  On the other hand, the recording sheet is pulled out from the sheet tray 13 and is conveyed toward the transfer portion along the conveyance path 14. Then, the recording sheet is sent to the secondary transfer unit in accordance with the timing at which the toner image on the intermediate transfer body 11 is conveyed, and the toner image is electrostatically transferred. The toner image transferred to the recording sheet is softened by the fixing device 15 and pressed onto the recording sheet, and then sent to the paper discharge tray 16.

Next, details of the charging device 2 will be described.
As shown in FIG. 2, the charging device 2 includes a front end member 31 and a rear end member 32 that are fixedly supported at predetermined positions with respect to the peripheral surface of the photosensitive drum 1. An electrode wire 33 that functions as a charging member is stretched over the wire. The electrode wire 33 is stretched and opposed in the width direction of the endless peripheral surface of the photosensitive drum 1, and is disposed so as to maintain a predetermined distance from the peripheral surface. In addition, a shield case 34 is provided as a covering member with both ends supported by both end members 31 and 32. As shown in FIG. 3, the shield case 34 surrounds the side portion and the upper portion along the electrode wire 33, and a portion facing the peripheral surface of the photosensitive drum is opened.
In the shield case 34, there is provided a cleaning unit 50 supported so as to be able to reciprocate in the axial direction of the electrode wire 33. Toner, discharge products, etc. attached to the inner surface of the case 34 by the electrode wire 33 and the seal It is intended to remove foreign matter.
In the charging device 2, the electrode wire 33 is used as a charging member. However, the electrode wire 33 is not limited to a wire, and an elongated plate-like member or rod-like member can be used.

  The end member 31 on the front side is provided with an air supply port 31a for introducing air into the peripheral portion of the electrode wire 33, and the end member 32 on the rear side is provided with an exhaust port 32a. An air introduction path is formed by the air supply port 31a, the exhaust port 32a, and the shield case 34, and a region along the electrode wire 33 in the shield case 34 from the end member 31 on the front side as indicated by an arrow in FIG. An air flow is formed in And it is discharged | emitted from the exhaust port 32a provided in the end member 32 of the back side. For such air supply and exhaust, external air is taken in by an intake fan from the front side where the operation panel of the image forming apparatus is provided, and the exhaust fan is passed through the front duct, the charging device 2 and the rear duct. Is discharged outside the machine.

  FIG. 3 is a cross-sectional view of the charging device 2 and shows a cross section in a direction perpendicular to the axis of the electrode wire 33 stretched in the width direction of the peripheral surface of the photosensitive drum 1. 4 to 7 are cross-sectional views of the cleaning unit 50 used in this charging device, and all show a cross-section parallel to the axis of the electrode wire 33. 4 and 5 show cross sections taken along lines A1-A1 and A2-A2 in FIG. 3, and FIGS. 6 and 7 show lines B1-B1 and B2-B2 shown in FIG. FIG.

The cleaning unit 50 of the charging device 2 includes a support 36 that moves along the axial direction of the electrode wire 33, and a first pad that is supported by the support 36 and contacts the electrode wire 33 from the photosensitive drum 1 side. 37, the second pad 38 that comes into contact from the back side, and the support 36 are fitted together and moved relatively back and forth in the direction of movement of the support 36, and the first pad 37 is moved relative to the electrode wire 33. And a moving member 39 that operates so as to come into contact with or be separated from each other. Also, on the outer side of the support 36, a rubbing member 41 that contacts the inner surface of the shield case 34 and a position on the support 36 where the rubbing member 41 is attached are provided in a concave shape. The adhering matter accommodating portion 42 that accommodates the adhering matter, the convex portion 46 provided along the front and rear edges of the support body to prevent the adhering matter from scattering, and the photosensitive drum 1 of the shield case 34 are opposed to each other. An adhering matter receiving portion 43 that is provided along the edge and receives the adhering matter falling on the photosensitive drum 1 from between the shield case 34 and the support 36 is provided.
A scraping member 45 that comes into contact with the moving rubbing member 41 is provided inside the shield case.

The support 36 is provided with a drive transmission portion 36 a extending from between the opposing photosensitive drum 1 and the shield case 34 to the outside of the region surrounded by the shield case 34. The drive transmission portion 36a is provided with a through-hole in the axial direction of the electrode wire 33, and a spiral groove is formed on the inner peripheral surface. A screw member 35 is screwed into the through hole, and both ends thereof are supported by a front end member 31 and a rear end member 32 and are driven to rotate.
On the other hand, the support 36 is provided with a protrusion 36b that is engaged with an edge of a slit provided in the shield case 34, and the support 36 is connected to the shield case 34 by the protrusion 36b and the drive transmission portion 36a. And is driven in the axial direction of the electrode wire 33 by the rotational drive of the screw member 35.

  The first pad 37 is attached to a support shaft 40 that is rotatably provided. When the support shaft 40 rotates within a predetermined angle range, the first pad 37 is separated from the electrode wire 33 and the position pressed against the electrode wire 33. It is intended to move between the positions. The support shaft 40 rotates in a predetermined angle range by relatively moving between a state in which the moving member 39 protrudes forward with respect to the support 36 or a state in which it protrudes rearward. . In the moving member 39, a portion protruding with the movement of the support 36 abuts the front end member 31 or the rear end member 32, and protrudes from the front side to the rear side or the state thereof. The reverse movement occurs. When the support 36 moves from the front side to the rear side by such an operation, the first pad 37 is pressed against the electrode wire 33 from the photosensitive drum 1 side, and is separated from the electrode wire 33 when moving in the reverse direction. The

  The position of the second pad 38 is fixed with respect to the support 36, and when the first pad 37 is not in contact with the electrode wire 33, the second pad 38 is slightly from the electrode wire 33. The electrode wire 33 is supported so as to face the electrode wire 33 at a position apart from the electrode wire 33. When the first pad 37 is pressed and the electrode wire 33 is displaced, the first pad 37 is also pressed against the second pad 38.

  The rubbing member 41 is adhered to the outside of the support 36 so as to contact the inside of the shield case 34. When the support 36 moves, the rubbing member 41 is rubbed against the inner surface of the shield case 34 to remove foreign matter. To be removed.

  The rubbing member 41 can employ, for example, a polishing pad made of a synthetic resin foam or non-woven fabric containing fine powder of abrasive having high hardness such as white alumina, and the inner surface of the shield case 34. It is desirable to use a material that elastically deforms so that it can be contacted with a uniform contact pressure. As such a rubbing member 41, an abrasive can be selected according to the material of the shield case 34, and it is desirable that the attached foreign matter can be peeled without damaging the inner surface of the shield case 34. In addition, the cost of replacement parts can be reduced by using a relatively inexpensive material such as a non-woven fabric containing an abrasive material laminated on a synthetic resin such as urethane and adhered to the support 36.

  The adhering matter accommodating portion 42 is formed by making a portion adjacent to the rubbing member 41 concave on the support 36. The adhering substance accommodating portion 42 is provided on both the front side and the rear side in the traveling direction of the support 36 with the rubbing member 41 interposed therebetween, and the rubbing member 41 is accompanied by the reciprocating movement of the support 36. Accommodates the deposits peeled off from the inner surface of the shield case 34.

A scattering suppression member 44 is attached to the entire area of the concave portion inside the adhering matter accommodating portion 42, and the adhering matter peeled off from the inside of the shield case 34 is scattered from the adhering matter accommodating portion 52. Is preventing.
The scattering suppression member 44 accommodates foreign matter accommodated in the adhering matter accommodating portion 42, such as a synthetic resin foam material or a fiber-integrated material, in a small hole of the foam material, or entangled between the accumulated fibers. A member that can be held is used.

  The convex portions 46 provided at the front and rear edges of the support body 36 along the adhering matter accommodating portion 42 have a wall shape protruding to a position close to the inner surface of the shield case 34. Thereby, the deposit | attachment from which the rubbing member 41 peeled is enclosed so that it may not be scattered from the said deposit | attachment accommodating part 42 back and forth.

  As shown in FIGS. 3, 5, and 7, the rubbing member 41, the adhering matter accommodating portion 42, and the convex portion 46 are shield cases from one side surface of the support 36 to the upper surface and the opposite side surface. 34 is provided in almost the entire range facing the inner surface of 34. As a result, the entire area of the inner surface of the shield case 34 is cleaned, and scattering of the separated deposits is prevented. Then, an adhering material receiving portion 43 is provided at the end of the support 36 facing the charged body 1 so as to be inserted between the edge 34a of the shield case 34 and the charged body 1 as shown in FIG. Is provided.

  The adhering matter receiving portion 43 is supported by the support body 36, and foreign matter is received between the side portion of the shield case 34 and the support body 36 and from the adhering matter accommodating portion 42 provided in this portion. It is accommodated so as to receive falling and prevents foreign matter from adhering to the surface of the member 1 to be charged. Foreign matter that falls between the side portion of the shield case 34 and the support 36 and from the deposit storage portion 42 provided in this portion is peeled off by the rubbing member 41 and then stored in the deposit storage portion 42. And foreign matters that fall without being held by the scattering suppressing member 44 in the deposit container 42.

The scraping member 45 is provided so as to protrude from the inner surface of the shield case 34, is continuous in a direction perpendicular to the moving direction of the support 36, and contacts the entire area of the sliding member 41 that moves. . The position at which the scraping member 45 is provided is slightly upstream from the position of the rubbing member 41 when the support body 36 stops near the end member 32 on the downstream side of the air flowing in the axial direction of the charging member 33. On the side. Thus, when the support 36 approaches the end member 32 on the downstream side of the air flow, that is, on the rear side of the image forming apparatus, the scraping member 45 comes into contact with the rubbing member 41 and adheres to the rubbing member 41. The foreign matter is scraped off and accommodated in the adhering matter accommodating portion 42.
In the present embodiment, the scraping member 45 is provided at one location on the downstream side of the air flowing in the axial direction of the charging member 33, but a plurality of scraping members 45 may be provided inside the shield case 34.

  The driving of the cleaning unit 50 as described above can be set to be performed, for example, when the image forming apparatus is turned on, before the start of the image forming operation, or at the end. Alternatively, the cleaning unit 50 can be set to be driven every time a predetermined number of images are formed.

  It is desirable to control the air flow generated by the air supply / exhaust device so that it is generated at least when the cleaning unit 50 is driven. Further, it is preferable that an air flow is generated when the peripheral surface of the photosensitive drum 1 is charged, and the cleaning unit 50 stands by on the downstream side of the air flow to quickly eliminate discharge products. In the above embodiment, air is introduced from the front end member 31 by the air supply / exhaust device, forms an air flow along the electrode wire 33, and discharges air from the rear end member 32. It may be introduced from the rear side and discharged to the front side.

  The charging device 2 described above is used in an electrophotographic image forming apparatus as a device for charging the photosensitive drum before being irradiated with image light substantially uniformly. However, the charging device according to the present invention is not limited to the charging device for the above-mentioned purposes, and is for transferring a toner image on an image carrier in an electrophotographic or electrostatic recording image forming apparatus. The toner may be used for charging or discharging the toner on the corona discharge device or the image carrier. In addition, a member other than an image carrier on which an electrostatic latent image is formed such as a photosensitive drum, for example, an intermediate transfer member or the like may be charged. Furthermore, the present invention can also be applied to an apparatus that is used in apparatuses other than the image forming apparatus and that requires cleaning of the charging member.

1 is a schematic configuration diagram illustrating an example of an image forming apparatus including a charging device according to an embodiment of the present invention. It is a schematic block diagram of the charging device which is one Embodiment of the invention which concerns on this application. It is sectional drawing of the charging device shown in FIG. FIG. 4 is a cross-sectional view of the cleaning unit provided in the charging device shown in FIG. 2, and is a cross-sectional view taken along line A <b> 1-A <b> 1 shown in FIG. 3. FIG. 4 is a cross-sectional view of the cleaning unit included in the charging device shown in FIG. 2, and is a cross-sectional view taken along line A <b> 2-A <b> 2 shown in FIG. 3. FIG. 4 is a cross-sectional view of the cleaning unit included in the charging device shown in FIG. 2, and is a cross-sectional view taken along line B <b> 1-B <b> 1 shown in FIG. 3. It is sectional drawing of the cleaning unit with which the charging device shown in FIG. 1 is provided, Comprising: It is sectional drawing in the B2-B2 line | wire shown in FIG.

Explanation of symbols

1: photosensitive drum (image holding member), 2: charging device, 3: developing device, 4: transfer device, 5: cleaning device, 6: image exposure device,
10: Image forming unit, 11: Intermediate transfer member, 12: Transfer roll, 13: Sheet tray, 14: Conveying path, 15: Fixing device, 16: Paper discharge tray, 17: Drive roll, 18: Opposing roll, 19: Support roll,
31: Front end member, 31a: Air supply port, 32: Rear end member, 32a: Exhaust port, 33: Electrode wire (charging member), 34: Shield case (cover member), 35: Screw member, 36: support, 36a: drive transmission unit, 36b: protrusion, 37: first pad (cleaning member), 38: second pad (cleaning member), 39: moving member, 40: support shaft, 41: Rubbing member, 42: deposit receiving portion, 43: deposit receiving portion, 44: scattering suppressing member, 45: scraping member, 46: convex portion,
50: Cleaning unit,

Claims (6)

A charging member having a shape that is long and continuous in one direction at a predetermined interval from the surface of the member to be charged, and a charging member to which a charging voltage is applied between the member to be charged;
A covering member provided so as to cover the charging member along the axial direction and to cover the back and sides of the object to be charged;
A cleaning unit that moves in the axial direction of the charging member to remove deposits on the inner surface of the covering member ;
The cleaning unit includes a support that is driven so as to reciprocate along the charging member from a standby position, a rubbing member that is supported by the support, and that contacts the inside of the cover member to peel off the adhered matter, The support in the range where the rubbing member is provided on the support is formed on at least one of the front side and the rear side in the traveling direction from the standby position, and is formed into a concave shape and peeled off by the rubbing member. An adhering matter accommodating portion for accommodating the adhering matter ,
The adhering matter accommodating portion retreats a portion adjacent to the rubbing member from a contact surface of the rubbing member with the cover member, and the rubbing member on the front side or the rear side of the rubbing member. A charging device characterized in that it is formed by providing a wall-like convex portion protruding toward the covering member at a distant position . A charging member having a shape that is long and continuous in one direction at a predetermined interval from the surface of the member to be charged, and a charging member to which a charging voltage is applied between the member to be charged;
A covering member provided so as to cover the charging member along the axial direction and to cover the back and sides of the object to be charged;
A cleaning unit that moves in the axial direction of the charging member to remove deposits on the inner surface of the covering member;
The cleaning unit includes a support that is driven so as to reciprocate along the charging member from a standby position, a rubbing member that is supported by the support, and that contacts an inner side of the covering member to peel off an attached matter, Provided between the edge of the cover member on the side of the charging member, which faces the charged body, and the charged body, so as to straddle the extended surface of the side portion. And a deposit receiving portion for receiving deposits falling from the side portion toward the charged object side. The adhering matter accommodating portion is made of a porous material or a material in which fibers are accumulated, and a scattering suppressing member is installed to take in the adhering adhering matter in a small hole or between fibers and suppress scattering. The charging device according to claim 1 .   A scraping member that is provided on an inner surface of the covering member and contacts the moving rubbing member to scrape off deposits adhering to the rubbing member from the rubbing member. The charging device according to any one of claims 1 to 3. An air introduction path for introducing air flowing in one direction with respect to the axial direction of the charging member at a position along the charging member;
The charging device according to claim 4, wherein the scraping member is provided downstream of the air flow.   The said rubbing member is composed of a synthetic resin foam containing abrasive fine powder or a pad on which fibers containing abrasive fine powder are accumulated. The charging device according to any one of 5 to 5.