JP4849161B2 - Charger - Google Patents

Description

  The present invention relates to a charger having a cleaning member for cleaning a discharge wire and a counter electrode.

  Conventionally, as a charger, a discharge wire extending in the axial direction of the photosensitive drum, a grid electrode (counter electrode) disposed between the discharge wire and the photosensitive drum, and both the discharge wire and the grid electrode are slidably contacted and cleaned. A thing provided with a cleaning member is known (refer to patent documents 1 and 2).

JP-A-4-369663 Japanese Patent Laid-Open No. 7-301978

  By the way, in the above-described technique, a sponge-like material is usually used for the portion of the cleaning member that is in sliding contact with the grid electrode. However, in such a sponge-like material, a toner or the like fixed on the grid electrode is used. It was difficult to sufficiently remove foreign matter. In addition, since the grid electrode is formed by opening a plurality of slit-like long holes in the plate-like portion, burrs and steps may occur at the time of manufacture, and when these burrs are caught on a sponge-like cleaning member, There is also a possibility that the operability of the cleaning member is deteriorated.

  Accordingly, an object of the present invention is to provide a charger that can smoothly clean a grid electrode by smoothly moving a cleaning member even if the grid electrode has a burr or the like.

  The present invention for solving the above-described problems includes a discharge wire extending along a predetermined direction, a grid electrode extending along the extending direction of the discharge wire and facing the discharge wire, the discharge wire, and the grid A frame that supports the electrode; and a charger having a cleaning member that cleans the grid electrode by moving in the extending direction while slidingly contacting the grid electrode, and the cleaning member is curved It has a sheet-like contact member bent in a state, and the bent portion of the contact member is configured to come into contact with the grid electrode.

  Here, the “curved state” includes not only a state in which the cross-sectional view is a perfect circle but also a state in which the shape is an ellipse.

  According to the present invention, since the bent portion of the contact member bent in a curved state comes into contact with the grid electrode of the cleaning member, even if the grid electrode has burrs, the bent portion can get over the burrs, The cleaning member can be moved smoothly.

  According to the present invention, since the bent portion of the contact member bent in a curved state can easily get over the burr and the like, the grid electrode can be cleaned well by smoothly moving the cleaning member.

1 is a cross-sectional view illustrating an overall configuration of a color printer. It is an expanded sectional view which shows the structure of a process cartridge. It is a perspective view which shows the upper side frame with which the cleaning member was mounted | worn. It is a perspective view which shows the cleaning member. It is a disassembled perspective view which decomposes | disassembles and shows a cleaning member. A cross-sectional view (a) showing a state in which the cleaning member is moved toward the burr, a cross-sectional view (b) showing a state when the cleaning member is getting over the burr, and a deposit adhered to the burr. It is sectional drawing (c) which shows a state. They are the front view (a) which looked at the supporting member from the front end side of the 1st protrusion, and the top view (b) which shows a film. It is a disassembled perspective view which shows the state which attaches the cleaning member to an upper frame. A bottom view (a) of the upper frame with the discharge wire, the counter electrode and the cleaning member removed from the lower side, and an upper frame with the discharge wire, the counter electrode and the cleaning member attached are shown in FIG. 9 (a). It is XX sectional drawing (b) cut | disconnected by the XX line. It is sectional drawing which shows the relationship between the cleaning member and grid electrode in a standby position.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, first, the overall configuration of the color printer will be briefly described, and then the characteristic part of the present invention will be described.

<Overall configuration of color printer>
As shown in FIG. 1, the color printer 1 includes a paper feeding unit 20 that supplies paper P, an image forming unit 30 that forms an image on the fed paper P, and an image formed in a main body housing 10. And a paper discharge unit 90 for discharging the paper P.

  An openable and closable upper cover 12 is provided on the upper portion of the main body casing 10. The upper surface of the upper cover 12 serves as a paper discharge tray 13 that accumulates the paper P discharged from the main body housing 10, and a plurality of holding members 14 that hold a plurality of LED units 40 described later are provided on the lower surface. ing.

  The paper feeding unit 20 is provided in the lower part of the main body housing 10, and is a paper feeding tray 21 that is detachably attached to the main body housing 10. A supply mechanism 22 is mainly provided.

  The image forming unit 30 mainly includes four LED units 40, four process cartridges 50, a transfer unit 70, and a fixing unit 80.

  The process cartridge 50 is arranged side by side in the front-rear direction between the upper cover 12 and the paper feed unit 20, and as shown in FIG. 2, the photosensitive cartridge 51 and a developing cartridge that can be attached to and detached from the photosensitive cartridge 51. 61. Each process cartridge 50 has the same configuration except that the color of the toner stored in the toner storage chamber 66 of the developing cartridge 61 is different.

  The photoconductor cartridge 51 mainly includes a drum case 52 and a photoconductive drum 53 and a charger 54 as an example of a photoconductor accommodated in the drum case 52.

  The developing cartridge 61 includes a developing case 62, a developing roller 63 accommodated in the developing case 62, a supply roller 64 and a blade assembly 65, and a toner accommodating chamber 66 formed in the developing case 62. .

  As shown in FIG. 1, the transfer unit 70 is provided between the paper feeding unit 20 and each process cartridge 50, and mainly includes a drive roller 71, a driven roller 72, a conveyance belt 73, and a transfer roller 74.

  The fixing unit 80 is disposed on the rear side of each process cartridge 50 and the transfer unit 70, and includes a heating roller 81 and a pressure roller 82 that is disposed to face the heating roller 81 and presses the heating roller 81.

  In the image forming unit 30 configured as described above, first, as shown in FIG. 2, the surface of the photosensitive drum 53 is uniformly charged by the charger 54, and then is irradiated with light emitted from each LED unit 40. Exposed. As a result, the potential of the exposed portion is lowered, and an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 53.

  Further, the toner in the toner storage chamber 66 is supplied to the developing roller 63 by the rotation of the supply roller 64, and enters the space between the developing roller 63 and the blade assembly 65 by the rotation of the developing roller 63 and is thin with a certain thickness. It is carried on the developing roller 63 as a layer.

  The toner carried on the developing roller 63 is supplied to the electrostatic latent image formed on the photosensitive drum 53 when the developing roller 63 comes into contact with the photosensitive drum 53. As a result, the toner is selectively carried on the photosensitive drum 53 to visualize the electrostatic latent image, and a toner image is formed by reversal development.

  As shown in FIG. 1, the sheet P supplied onto the conveyor belt 73 passes between the photosensitive drums 53 and the transfer rollers 74 disposed inside the conveyor belt 73, so that each photosensitive drum The toner image formed on 53 is transferred onto the paper P. When the paper P passes between the heating roller 81 and the pressure roller 82, the toner image transferred onto the paper P is thermally fixed.

  The paper discharge unit 90 includes a paper discharge side conveyance path 91 that extends upward from the exit of the fixing unit 80 and is reversed to the front side, and a plurality of pairs of conveyance rollers 92 that convey the paper P. Yes. The paper P on which the toner image has been transferred and heat-fixed is transported through a paper discharge-side transport path 91 by a transport roller 92, discharged outside the main body housing 10, and accumulated in the paper discharge tray 13.

<Charger structure>
Next, the structure of the charger 54 will be described in detail.
As shown in FIG. 2, the charger 54 includes a resin (insulating) upper frame 100 as an example of a frame constituting the upper portion of the drum case 52, and a discharge wire 110 supported by the upper frame 100. And a counter electrode 120 and a cleaning member 200 shown in FIG.

  The discharge wire 110 is a wire that extends along the axial direction (predetermined direction) of the photosensitive drum 53, and is disposed in a long groove 101 (see FIG. 3) formed in the upper frame 100, and both ends thereof are arranged on the upper frame. 100.

  The counter electrode 120 is a plate-like electrode that extends along the axial direction of the photosensitive drum 53 and is bent in a U-shape in cross section so as to face the discharge wire 110, and mainly includes the grid electrode 121 and a pair of And a shield electrode 122.

  The grid electrode 121 is an electrode disposed between the discharge wire 110 and the photosensitive drum 53, and is formed into a plurality of wires by forming a plurality of slits at the bottom of the U-shaped counter electrode 120. .

  Each shield electrode 122 is arranged to face (position) so as to sandwich the discharge wire 110 in the moving direction of the photosensitive drum 53. Here, the “moving direction of the photosensitive drum 53” refers to the moving direction of the portion of the photosensitive drum 53 that faces the grid electrode 121 (in FIG. 2, diagonally upward).

  As shown in FIG. 3, the cleaning member 200 is movably mounted in the long groove 101 of the upper frame 100, and moves while sliding on the discharge wire 110 and the counter electrode 120 (see FIG. 2). The wire 110 and the counter electrode 120 are cleaned. Specifically, as illustrated in FIG. 4, the cleaning member 200 includes a support member 210, a film 220 as an example of a plate-like member, and a plate-like sponge 230 as an example of a sliding contact member.

  As shown in FIG. 5, the support member 210 mainly includes an operation portion 211 formed in a substantially rectangular flat plate shape and two arm portions 212 that can be bent and deformed downward from the lower surface of the operation portion 211. Yes. Each arm portion 212 is formed with a first protrusion 213 and a second protrusion 214 for supporting the film 220 and the plate-like sponge 230.

  Each first protrusion 213 is formed in a substantially triangular prism shape, and supports the film 220 in a state of penetrating through an engagement hole 227 formed in the film 220. More specifically, each first protrusion 213 supports one side and the other side of the film 220 separated by the slit 226. In addition, the first protrusion 213 contributes to suppressing both ends of the plate-like sponge 230 bent in a substantially U shape from spreading in a direction away from each other.

  Each of the second protrusions 214 is formed in a quadrangular prism shape, and supports the bent portion of the substantially U-shaped plate-like sponge 230 so as to sandwich it.

  As shown in FIG. 5, the film 220 is a PET film that can be bent and deformed, and is supported by a support member 210 so as to stand along a substantially vertical direction. The film 220 connects the distal end 221 positioned on the grid electrode 121 (see FIG. 2) side, the proximal end 222 positioned on the opposite side of the distal end 221, and the distal end 221 and the proximal end 222. It has a pair of side end portions 223 that are opposed (positioned) in a direction orthogonal to the direction and located on the pair of shield electrodes 122 (see FIG. 2).

  A sheet-like polishing member 300 as an example of a contact member is bent and fixed to the front end 221 of the film 220 so as to wrap around the front end 221, thereby, FIGS. 6A to 6C. As shown, the bent portion 301 of the curved polishing member 300 is in contact with the grid electrode 121. Therefore, when the cleaning member 200 is moved, the bent portion 301 does not get caught by the burr B, and the foreign matter (toner or the like) adhering to the grid electrode 121 can be removed while satisfactorily getting over the burr B. ing.

  In addition, as the sheet-like polishing member 300, any member may be adopted as long as it is a member configured to have a polishing surface (a member that polishes deposits on the grid electrode), For example, a sheet-shaped metal file or a paper file can be employed.

  As shown in FIG. 5, a sheet-like felt member 310 as an example of a wiping member formed of a porous material is bent at both side ends 223 of the film 220 so as to wrap around both side ends 223. It is fixed. As a result, the felt member 310 is in sliding contact with the shield electrode 122, and the foreign matter adhering to the shield electrode 122 can be wiped off with the felt member 310 satisfactorily.

  The polishing member 300 and the felt member 310 described above are strongly pressed against the grid electrode 121 and the shield electrode 122 by the deformed film 220. Therefore, the polishing member 300 can be pressed strongly against the grid electrode 121 to remove the foreign matter (toner or the like) adhering to the grid electrode 121, and felt even if the toner or the like is firmly fixed to the shield electrode 122. By firmly pressing the member 310, the adhered toner or the like can be wiped off well.

  A notch 224 is formed between the front end 221 and the side end 223 of the film 220. Thereby, since the front-end | tip part 221 and the both-sides end part 223 of the film 220 do not receive the influence of a mutual deflection, the front-end | tip part 221 and the both-side end part 223 of the film 220 are accurately and grid electrode 121 and each shield electrode 122. Can be contacted.

  In addition, a hole 225 for passing the discharge wire 110 (see FIG. 2) is formed in the film 220, and a slit 226 that extends from the hole 225 to the tip portion 221 is formed. The hole 225 is formed in a shape that is not line symmetric with respect to the slit 226. Thereby, for example, it is possible to prevent erroneous assembly such that the front and back of the film 220 are mistaken by visual observation, and to prevent a good assembly due to burrs formed at the edges of the holes 225 and the like.

  In order to prevent erroneous assembly, instead of devising the shape of the hole 225, the left first protrusion 213 and the right first protrusion 213 are formed to have different shapes and matched to these shapes. You may form so that the shape of each engagement hole 227 mentioned later may differ. In addition, a configuration for preventing misassembly (for example, in the support member 210, a protrusion is provided only on one of the left and right sides of the slit 226, and a hole into which the protrusion enters is formed in the film 220). Also good.

  Furthermore, the film 220 is formed with an engagement hole 227 formed symmetrically with respect to the slit 226 so as to sandwich the slit 226. As shown in FIGS. 7A and 7B, the engagement hole 227 has three corners 227A, 227B, which engage with the three corners 213A, 213B, 213C of the first protrusion 213 of the support member 210. 227C.

  The three corners 227A, 227B, 227C are formed at positions rotated by a slight angle from the positions of the three corners 213A, 213B, 213C. Specifically, the direction of this rotation is the direction in which the slit 226 opens (the direction in which one side separated by the slit 226 moves away from the other in a circular arc shape with the base end 222 of the film 220 as the center). Is the opposite direction.

  More specifically, the three corners 227A, 227B, 227C on the left side of the figure are formed at positions rotated counterclockwise in the figure from the positions of the three corner parts 213A, 213B, 213C on the left side of the figure. Also, the three corners 227A, 227B, 227C on the right side of the figure are formed at positions rotated clockwise from the position of the three corner parts 213A, 213B, 213C on the right side of the figure.

  Thereby, when each engagement hole 227 of the film 220 is attached to the first protrusion 213 of the support member 210, each corner 227A, 227B, 227C moves to the position of each corner 213A, 213B, 213C. By matching, the slit 226 is slightly opened (see FIG. 4). That is, the slit 226 is configured to open depending on the difference in the shape of the attachment portion (each first protrusion 213 and each engagement hole 227) between the arm portion 212 and the film 220.

  As shown in FIG. 5, the plate-like sponge 230 is an insulating member that is in sliding contact with the discharge wire 110 (see FIG. 2) in the extending direction thereof, and is a support member that is bent in a substantially U shape. 210 is sandwiched between the second protrusions 214. Then, the film 220 is sandwiched between the plate-like sponge 230 and the support member 210 by being sandwiched between the second protrusions 214 in this way.

  Further, as shown in FIG. 8, a pair of engaging walls 102 formed so as to protrude from a pair of side walls forming the long groove 101 are formed on one end side of the long groove 101 of the upper frame 100. The engaging wall 102 comes into contact with each notch portion 224 (on both side ends) of the film 220 when the cleaning member 200 is attached to the long groove 101, and thereby the slit 226 of the film 220 further increases. It is possible to open and allow the discharge wire 110 to smoothly enter the hole 225.

  Further, as shown in FIGS. 9A and 9B, a pair of tapers that push the arm portions 212 (second projections 214) of the support member 210 toward each other in the long groove 101 of the upper frame 100. A surface 103 is formed. Accordingly, after inserting the cleaning member 200 from one end side (engagement wall 102 side) of the long groove 101, the arm member of the support member 210 is slid to the other end side as shown in FIG. 9B. 212 approaches and the slit 226 of the film 220 closes.

  Specifically, the pair of tapered surfaces 103 push each arm portion 212 (each second protrusion 214) in the approaching direction, and the two corner portions 213A and 213D (each of the first protrusions 213 provided integrally with each arm portion 212). 7) presses the two corners 227A and 227D of each engagement hole 227 of the film 220 inward, so that the slit 226 of the film 220 is closed. As a result, when the cleaning member 200 is positioned at the cleaning position for cleaning the grid electrode 121, the slit 226 is closed and slidably contacts the entire grid electrode 121, so that the grid electrode 121 can be cleaned well. It has become. Further, the plate-like sponge 230 (see FIG. 4) is pressed and contracted by approaching the arm portions 212 of the support member 210 in this way, so that the discharge wire 110 is strongly rubbed with the plate-like sponge 230 to improve cleaning. It is possible to do it.

  Further, at the standby position shown in FIG. 10, the polishing member 300 moves away from the grid electrode 121 and comes into contact with (climbs on) the upper frame 100, so that resin (insulating) is made between the grid electrode 121 and the polishing member 300. The upper frame 100 is configured to be interposed. Here, the “standby position” is a position on one end side of the discharge wire 110, and the cleaning member 200 waits so as not to disturb the discharge from the discharge wire 110 to the photosensitive drum 53 when the printing operation is performed. Says the position. According to this, when the polishing member 300 is a metal file, it is possible to reliably prevent electric leakage from the grid electrode 121 to the metal file.

  When a metal file is used, as shown in the figure, a metal file (polishing member 300) is provided only at the tip 221 of the film 220, and an insulating plate is provided between the discharge wire 110 and the metal file. It is desirable to interpose a sponge 230. According to this, the insulating plate-like sponge 230 reliably prevents discharge from the discharge wire 110 to the metal file.

  It is desirable that the metal file be formed in such a size that it is not sandwiched between the plate-like sponge 230 and the film 220, that is, a size that does not reach the surface of the plate-like sponge 230 on the film 220 side. According to this, the plate-like sponge 230 can be brought into close contact with the film 220 and the film 220 can be satisfactorily fixed to the support member 210.

According to the above, the following effects can be obtained in the present embodiment.
Since the bent portion 301 of the polishing member 300 is in contact with the grid electrode 121, the bent portion 301 can get over the burr B or the like even if the grid electrode 121 has a burr B or a step. Therefore, the cleaning member 200 can be moved smoothly, and the grid electrode 121 can be cleaned well.

  Since the contact member to be brought into contact with the grid electrode 121 is the polishing member 300, foreign matter (toner or the like) attached on the grid electrode 121 can be removed. In addition, when the polishing member 300 is a sheet-shaped metal file, the durability thereof can be improved, and the polishing member 300 is in contact with the burr B of the metal grid electrode 121. Wear can be reduced.

  Since the polishing member 300 is strongly pressed against the grid electrode 121 by the deformed film 220, the foreign material (toner or the like) attached on the grid electrode 121 by the polishing member 300 can be removed well.

  Since the felt member 310 formed of a porous material is provided on both side end portions 223 of the film 220, foreign matters attached to the shield electrode 122 can be wiped off satisfactorily.

  Since the plate-like sponge 230 is disposed between the polishing member 300 and the discharge wire 110, when the polishing member 300 is a metal file, the discharge from the discharge wire 110 to the metal file can be prevented.

  Since the cleaning member 200 includes the plate-like sponge 230 that cleans the discharge wire 110 and the film 220 that cleans the counter electrode 120, the discharge wire 110 and the counter electrode 120 can be cleaned at the same time simply by moving the cleaning member 200. can do. Further, since the film 220 is sandwiched between the support member 210 and the plate-like sponge 230, the plate-like sponge 230 for cleaning the discharge wire 110 also serves as a member for preventing the film 220 from being detached from the support member 210. The number of parts can be reduced.

  When the cleaning member 200 is located at the standby position, the polishing member 300 is separated from the grid electrode 121 and contacts the upper frame 100. Therefore, when the polishing member 300 is a metal file, leakage from the grid electrode 121 to the metal file is prevented. It can be surely prevented.

  By forming the notch portion 224 between the front end portion 221 and the both side end portions 223 of the film 220, the front end portion 221 and the both side end portions 223 of the film 220 are not affected by mutual bending. The tip 221 and the side ends 223 can be brought into contact with the grid electrode 121 and each shield electrode 122 with high accuracy.

  When the film 220 is attached to the support member 210, the slit 226 is configured to open due to the difference in the shape of the attachment portion between the arm portion 212 and the film 220, so that the discharge wire 110 is inserted into the hole 225 through the opened slit 226. Can be set smoothly. Therefore, the cleaning member 200 can be easily attached to the upper frame 100.

  When the cleaning member 200 is attached to the upper frame 100, the notches 224 (both side ends) of the film 220 come into contact with the upper frame 100 and the slit 226 is further opened, so that the discharge wire 110 passes through the slit 226 that is wide open. Can be set in the hole 225 more smoothly. Therefore, the cleaning member 200 can be further easily attached.

  Since the open slits 226 can be closed by pushing the arm portions 212 of the support member 210 toward each other with the pair of tapered surfaces 103 of the upper frame 100, the leading end portion 221 of the film 220 can be satisfactorily applied to the grid electrode 121. Can be brought into sliding contact.

In addition, this invention is not limited to the said embodiment, It can utilize with various forms so that it may illustrate below.
In the said embodiment, although the film 220 made from PET was employ | adopted as a plate-shaped member, this invention is not limited to this, Other resin-made films may be sufficient and paper etc. may be sufficient. Moreover, you may employ | adopt the member which does not bend and deform as a plate-shaped member.

  In the said embodiment, although the sheet-like polishing member 300 was wound around the front-end | tip part 221 of the film 220, this invention is not limited to this, For example, you may wind the member without polishing power around the front-end | tip of a film. Even in this case, the cleaning member can be moved smoothly because it is easy to get over the burr and the like.

  In the said embodiment, although the felt member 310 was employ | adopted as a wiping member comprised with a porous material, this invention is not limited to this, For example, sponge etc. may be employ | adopted.

  In the above-described embodiment, the film 220 (specifically, the polishing member 300 and the felt member 310) is brought into sliding contact with the grid electrode 121 and each shield electrode 122. However, the present invention is not limited to this, and only the grid electrode 121 is contacted. The film 220 may be brought into sliding contact.

  In the above-described embodiment, the notch 224 of the film 220 is configured to contact the engaging wall 102 of the upper frame 100. However, the present invention is not limited to this, and may be configured not to contact. Even in this case, when the engagement hole 227 of the film 220 is attached to the first protrusion 213 of the support member 210, the slit 226 can be opened. Therefore, the discharge wire 110 is inserted into the hole 225 through the opened slit 226. Can enter.

In the embodiment, the notch 224 is formed as a V-shaped recess, but the present invention is not limited to this, and may be formed in a slit shape, for example.
In the above embodiment, the plate-like sponge 230 is used as the sliding contact member, but the present invention is not limited to this, and for example, a plate-like felt may be adopted.

In the above embodiment, the present invention is applied to the color printer 1. However, the present invention is not limited to this, and the present invention may be applied to other image forming apparatuses such as a copying machine and a multifunction machine.
In the above-described embodiment, the photosensitive drum 53 is employed as the photosensitive member. However, the present invention is not limited to this, and for example, a belt-shaped photosensitive member may be employed.

54 Charger 100 Upper Frame 110 Discharge Wire 120 Counter Electrode 121 Grid Electrode 200 Cleaning Member 210 Support Member 211 Operation Unit 212 Arm Unit 220 Film 221 Tip 223 Side End 224 Notch 226 Slit 230 Plate Sponge 300 Polishing Member 301 Bending Part 310 Felt member B Burr

Claims (11)

A discharge wire extending along a predetermined direction;
A grid electrode extending along the extending direction of the discharge wire and facing the discharge wire;
A frame that supports the discharge wire and the grid electrode;
A charger having
A cleaning member for cleaning the grid electrode by moving in the extending direction while slidingly contacting the grid electrode,
The cleaning member has a plate-like member and a sheet-like contact member bent in a curved state so as to wrap the tip of the plate-like member ,
The contact member is
A charging device comprising a sheet-like polishing member for polishing deposits on the grid electrode, wherein a bent portion of the contact member is in contact with the grid electrode. 2. The charger according to claim 1 , wherein the plate-like member is formed so as to be able to bend and deform, and presses the polishing member against the grid electrode in a state of being bent and deformed. It further includes a pair of shield electrodes positioned so as to sandwich the discharge wire,
The charger according to claim 1 , wherein a wiping member that is in sliding contact with the shield electrode is provided on both side ends of the plate-like member. The charger according to claim 1 , wherein the polishing member is a metal file. The cleaning member is
A support member for supporting the plate member;
An insulating sliding contact member supported by the support member and in sliding contact with the discharge wire in the extending direction;
The charger according to claim 4 , wherein the sliding contact member is disposed between the metal file provided at a tip of the plate-like member and the discharge wire. The cleaning member is
A support member for supporting the plate member;
A sliding contact member supported by the support member and in sliding contact with the discharge wire in the extending direction;
The charger according to claim 1 , wherein the plate-like member is sandwiched between the sliding contact member and the support member. The frame is made of an insulator,
6. The charger according to claim 4 , wherein when the cleaning member is positioned at a standby position on the end side of the discharge wire, the metal file is separated from the grid electrode and contacts the frame. . The charger according to claim 3 , wherein a notch portion is formed between a front end and both side ends of the plate-like member. In the plate-like member, a hole for passing the discharge wire is formed, and a slit is formed from the hole to the tip of the plate-like member,
The support member is provided with two flexibly deformable arm portions that respectively support one and the other of the plate-like members separated by the slit,
6. The structure according to claim 5 , wherein, when the plate-like member is attached to the support member, the slit is opened due to a difference in shape of an attachment portion between the arm portion and the plate-like member. Item 7. A charger according to Item 6 . 10. The structure according to claim 9 , wherein, when the cleaning member is attached to the frame, the slits are configured to be further opened when both side ends of the plate-like member are in contact with the frame. Charger. 11. The charger according to claim 9 , wherein the frame is formed with a tapered surface that pushes the arm portions toward each other.

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