JPH0625849U - Charging device for electrophotographic device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a charging device for an electrophotographic device which enables automatic cleaning of the charging wire and the grid wire and facilitates cleaning and replacement work of the charging wire by a service person. Is the purpose. [Structure] The scorotron 10 includes a cleaner main body 82 including a discharger main body 80 on which a charging wire 106 and a grid wire 114 are stretched, a feed screw 122, a moving piece 126, and the like.
And both are detachably assembled with a screw 148. A cleaner 128 for cleaning the charging wire 106 and the like is also detachably attached to the upper cleaner 130 and the lower cleaner 132. Therefore, both can be easily separated at the time of work, and the charging wire 106 and the like can be easily cleaned and replaced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used in an electrophotographic apparatus that forms a toner image by forming an electrostatic latent image on the surface of a photoconductive photoconductor and developing the electrostatic latent image, and has an automatic cleaning function for charging wires and the like. The present invention relates to a charging device for an electrophotographic device.

[0002]

[Prior art]

 Generally, in an electrophotographic apparatus such as a copying machine or a laser beam printer, a charging device is arranged at a position close to the surface of the photosensitive drum. After the surface of the photosensitive drum is charged by the charging device, it is exposed by the exposure device to form an electrostatic latent image, and a toner image is obtained by developing the electrostatic latent image.

This type of charging device includes a shield case in which an insulating block is disposed, and a charging wire for charging the surface of the photosensitive drum by corona discharge is stretched around the shield case. In addition, there is also one with multiple grid wires stretched to evenly disperse the corona discharge by the charging wire and improve the image quality (hereinafter, the charging device equipped with the charging wire and the grid wire is referred to as "scorotron"). Say).

FIG. 8 shows an example of this type of scorotron in a state of being cut at the widthwise middle portion. This scorotron 150 is provided with a conductive shield case 152 in which both ends of a rectangular flat plate are bent in the same direction to have a U shape, and insulating blocks 154 and 156 are provided inside both ends in the longitudinal direction of the shield case 152. It is arranged. Between these insulating blocks 154 and 156, a charging wire 158 is stretched on the bottom surface side and a plurality of grid wires 160 are stretched on the upper open side surface.

By the way, when the electrophotographic apparatus is continuously used, the charging wire 158 and the grid wire 160 deteriorate themselves, and NO _x (nitrogen oxide) and used toner adhere to the surface to stain the surface. . In addition, the charging wire 159 and the grid wire 160 may be broken in some cases due to deterioration or the like. For this reason, in the past, when a service person regularly performs maintenance and inspection, the charging wire 158, the grid wire 160, etc. are wiped and cleaned with alcohol, etc., and these parts are replaced if necessary. Was there.

However, in the scorotron 150 having this structure, when the service person pulls out the entire scorotron 150 from the electrophotographic apparatus to clean or replace the charging wire 158, the grid wire 160 becomes an obstacle and is troublesome. There is a problem that it takes. Further, during cleaning and replacement of the charging wire 158, the grid wire 160 may be caught and broken or loosened, so that a serviceman requires a certain degree of skill. As a result, there is a problem that the cost required for maintenance becomes high.

A scorotron having a structure intended to eliminate such a problem is disclosed in Japanese Utility Model Laid-Open No. 58-11753. As shown in FIGS. 7A and 7B, in this scorotron 162, the casing 166 is inserted into a guide rail 164 (see FIG. 7B) provided in the electrophotographic apparatus. ing. A predetermined tension is applied to one end of the casing 166 in the longitudinal direction by a charging wire end block 170A on which a charging wire 168 is stretched and a spring 172 (see FIG. 7A). A separable insulating block 170 is disposed on a grid wire end block 170B on which a plurality of grid wires 174 are stretched. An insulating block (not shown) is similarly arranged at the other end of the casing 166 in the longitudinal direction. Of these, the charging wire end block 170A is fixed to the casing 166. Further, a groove 176 for sliding the grid wire end block 170B is formed inside the casing 166.

According to this scorotron 162, only the grid wire end block 170B (grid wire 174) can be extracted independently while leaving the charging wire end block 170A (power charging wire 168) in the electrophotographic apparatus. This is possible, which facilitates cleaning of the grid wire 174.

[0009]

[Problems to be solved by the device]

 However, as is the case with the scorotron 150 shown in FIG. 8 described above, all maintenance and inspection work is also performed by the serviceman's manual work even with this scorotron 162, so the work is still complicated and maintenance-intensive. The problem of high cost is not solved. Further, according to this structure, only the grid wire end block 170B is extracted alone while the charging wire end block 170A is left in the apparatus, that is, the scorotron 162 is divided into wire units. When the grid wire end block 170B is again inserted into the apparatus later, there is a risk of hitting it against the charging wire end block 170A or the like. In this case, the grid wire 174 is damaged or loosened, which causes image deterioration.

Note that there is a scorotron of this type configured to automatically clean the charging wire and the like when the scorotron is mounted in an electrophotographic apparatus, but in general, such a scorotron has an automatic cleaning function. It has a structure that cannot be separated. It is also possible to add this automatic cleaning function to the scorotron 162, but it is necessary to install a cleaner for automatic cleaning inside the scorotron 162, so this is required when the end block 170B for the grid wire is pulled out. And the cleaner interfere with each other, and the cleaner cannot be extracted, which is not possible due to the configuration.

In consideration of the above facts, the present invention makes it possible to automatically clean the charging wire and the grid wire, and at the same time, the charging device for an electrophotographic apparatus can be easily cleaned and replaced by a service person. The purpose is to obtain.

[0012]

[Means for Solving the Problems]

 The present invention according to claim 1 is used in an electrophotographic apparatus for forming a toner image by forming an electrostatic latent image on the surface of a photoconductive photoreceptor and developing the electrostatic latent image. A charging wire that charges the surface of the photoconductor by corona discharge, and a plurality of charging wires are arranged between the charging wire and the surface of the photoconductive photoconductor, and corona discharge from the charging wire is applied to the surface of the photoconductive photoconductor. A discharger body having a grid wire for uniformly charging the cleaner, and a cleaner disposed at least partially in contact with the charging wire and the grid wire and moved along the charging wire and the grid wire. A cleaning device main body having a driving means, wherein the cleaning device main body is detachably attached to the charging wire side of the discharger main body. It is characterized in that digit.

According to a second aspect of the present invention, in the first aspect of the present invention, the cleaner is separable into a discharger body side and a cleaner body side with respect to the charging wire. Is characterized by.

[0014]

[Action]

 According to the first aspect of the present invention, the electrophotographic apparatus has a discharger body and a cleaner body, and the cleaner body is detachably attached to the charging wire side of the discharger body. Therefore, the cleaner body and the discharger body can be separated as necessary. For this reason, for example, when cleaning the charging wire, grid wire, etc. with alcohol, etc., or replacing them by a service person, after removing the charging device, the main body of the discharger alone can be separated by separating the two main bodies. Since the work can be performed as a target, the work can be easily performed. Since the main body of the cleaning device is separably attached to the charging wire side of the main body of the discharge device, it does not hinder the discharge at the time of charging the surface of the photoconductive photoconductor described later.

Further, when the charging device is mounted on the electrophotographic apparatus, the cleaner arranged in a state of being in partial contact with at least the charging wire and the grid wire is driven by the driving means of the cleaner body. Also, since it moves along the grid wire, at least automatic cleaning of the charging wire and the grid wire is possible.

In the charging device described above, corona discharge is generated by the charging wire of the main body of the discharge device, and the surface of the photoconductive photosensitive member is charged by this. At this time, the surface of the photoconductive photoconductor is uniformly charged by a plurality of grid wires arranged between the charging wire and the surface of the photoconductive photoconductor. After that, an electrostatic latent image is formed on the surface of the photoconductive photoconductor, and the electrostatic latent image is developed to form a toner image.

According to the present invention as set forth in claim 2, in the present invention as set forth in claim 1, the cleaner is separable between the discharger main body side and the cleaner main body side with respect to the charging wire. Since the cleaner can be separated when separating the main body of the electric device and the main body of the cleaning device, the cleaning and replacement work of the charging wire and the like described above can be further facilitated.

[0018]

【Example】

 A scorotron 10 as a charging device according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 6 shows a schematic configuration of a copying machine 12 as an electrophotographic apparatus including the scorotron 10. The copying machine 12 includes an exposure device 20 including a light source 14, a plurality of mirrors 16 and 17, a lens unit 18, and the like. Further, the copying machine 12 is provided with a document placing plate 22 above the exposure device 20 so that a document to be copied can be set. The light source 14 and the mirror 17 described above are movable along the document placing plate 22, and the image of the document set on the document placing plate 22 is transferred to the photoconductive photosensitive member arranged in the approximate center of the copying machine 12. The photosensitive drum 24 as a body is configured to scan and expose to a predetermined position on the peripheral surface.

The photosensitive drum 24 is made of a conductive material such as aluminum, and its peripheral surface is coated with an organic (or inorganic) photoconductor. On the peripheral surface of the photosensitive drum 24, the scorotron 10 (which will be described later in detail), the developing roller 26, the conveyance roller 28, the transfer charger 29, and the peeling claw are arranged along the rotation direction (direction of arrow A in FIG. 6). A cleaning brush roller 32, a cleaning blade 34, and a static eliminator 36 are sequentially arranged. Hereinafter, a brief description will be given in this order.

Between the developing roller 26 and the photosensitive drum 24, toner 40 supplied from a toner cartridge 38 loaded inside the copying machine 12 is supplied by a toner replenishing roller 42 and a brush roller 44. Further, the carrying roller 28 is connected to a stocker 46 arranged at the lower part of the side surface of the copying machine 12 by a carrying path 48. The stocker 46 is provided with a plurality of paper sheets 50 and a pair of paper feed rollers 52 that sandwich the paper sheets one by one and feed them into the copying machine 12. The transport path 48 is composed of a plurality of guide plates 54, transport rollers 56, and guide rollers 58, and sandwiches and transports the paper 50 transported by the paper feed roller 52 between the transport rollers 28.

The carrying roller 28 makes the paper 50 carried through the carrying path 48 come into close contact with the lower portion of the peripheral surface of the photosensitive drum 24, and the paper 50 brought into close contact with the peripheral surface of the photosensitive drum 24 by the carrying roller 28. Further, a transfer charger 29 arranged adjacent to the transport roller 28 transfers the toner image. A peeling claw 30 is arranged at a position adjacent to the conveying roller 28, and the peeling claw 30 separates the sheet 50 after transfer and sends it to the conveying path 60. A cleaning brush roller 32 and a cleaning blade 34 are disposed on the downstream side of the peeling claw 30 in the rotation direction of the photosensitive drum 24, and the toner 40 attached to the peripheral surface of the photosensitive drum 24 after the paper 50 is peeled off. Are being removed. Further, a charge eliminator 36 is arranged on the downstream side of the cleaning blade 34 in the rotation direction of the photosensitive drum 24, and the charge is removed in advance before the photosensitive drum 24 is charged by the scorotron 10.

On the other hand, the transport path 60 is composed of a plurality of guide plates 62, a transport roller 64, and a guide roller 66, and the paper 50 peeled by the peeling claw 30 is disposed on the downstream side of the transport path 60. The pressure fixing roller 68 is guided. The sheet 50, which has been pressure-fixed by the pressure-fixing roller 68, is peeled by the peeling claw 70, then is sandwiched by the pair of paper-discharging rollers 72, and is discharged to the tray 74 provided on the side surface of the copying machine 12. It is configured as follows.

As shown in FIGS. 1 and 2, the scorotron 10 described above is composed of a discharger body 80 and a cleaner body 82. Note that FIG. 1 is a perspective view showing a partially exploded view of FIG. 2 in an inverted state. The discharger main body 80 is provided with a pair of shield cases 84 which are rectangular plate materials, and these are made of a conductive material. Between the pair of shield cases 84, rectangular parallelepiped insulating blocks 86 and 88 are arranged at both ends in the longitudinal direction. The pair of insulating blocks 86 and 88 and the pair of shield cases 84 are assembled to each other by a plurality of screws 90. The height dimensions of the insulating blocks 86 and 88 are slightly larger than the height dimension of the shield case 84. Therefore, when the insulating blocks 86 and 88 are assembled together, the insulating blocks 86 and 88 are slightly larger than the shield case 84. Is also projected.

As shown in FIGS. 1 and 3C, the insulating block 86 described above has a recess 92 formed on the surface thereof on the side of the cleaner main body 82, and in the center of the recess 92. The pair of locking screws 94 are erected in a state where only a part of them is screwed. Similarly, the insulating block 88 has a recess 96 formed on the surface thereof on the cleaner body 82 side. A pair of notches 98 and 100 are formed on the end surfaces of these insulating blocks 86 and 88 that face each other. Further, the insulating block 88 is provided with a pair of terminals 102, 104, and the tip end portion 102A of one of the terminals 102 is inserted into the recess 96. Further, a pair of protrusions 102B is formed on the tip end portion 102A of the terminal 102, and one end of the charging wire 106 is locked to each of them. The intermediate portion of these charging wires 106 is arranged in the notches 98 and 100 of the insulating blocks 86 and 88, and the other end is locked to the locking screw 94 via the tension coil spring 108. Therefore, a predetermined tension is applied to each charging wire 106 by the tension coil bar 108.

The surfaces of the insulating blocks 86 and 88 on the side opposite to the cleaner body 82 are arcuate surfaces having a radius slightly longer than the radius of the photosensitive drum 24 described above. As shown in FIGS. 2 and 3 (A), locking projections 110 and 112 are formed at predetermined intervals on the arc surface sides of the insulating blocks 86 and 88. A grid wire 114, one end and the other end of which are fixed in contact with the shield case 84 by a screw 90, is stretched over the locking projections 110 and 112 in order. For this reason, the grid wire 114 is stretched along the arc surfaces of the insulating blocks 86 and 88, and it is possible to dispose the grid wire 114 close to and equidistant to the peripheral surface of the photosensitive drum 24 described above. . The charging wire 106 and the grid wire 114 are insulated from each other by insulating blocks 86 and 88.

On the other hand, as shown in FIGS. 1 and 2, the cleaner main body 82 also includes a casing 116 having a substantially U-shaped longitudinal cross section corresponding to the shield case 84 of the discharger main body 80. Both side walls 116A are arranged in contact with the shield case 84 of the discharger body 80. A guide groove 118 is formed in the middle of the casing 116 in the width direction along the longitudinal direction thereof. A bearing 120 by cutting and raising is formed at one end of the guide groove 118 in the longitudinal direction, and one end of the feed screw 122 in the axial direction is pivotally supported. The other end of the feed screw 122 in the axial direction is connected to a motor (not shown) in a block 124 arranged at the end of the casing 116 (the end on the insulating block 86 side of the discharger body 80). ing. The operation of the motor (forward rotation, reverse rotation, operation timing, etc.) is controlled by a controller (not shown). A moving piece 126 is screwed into an axially intermediate portion of the feed screw 122, and is fitted and held in the guide groove 118. The moving piece 126 has a substantially cruciform shape, and includes a base portion 126A to which the feed screw 122 is screwed, a rectangular parallelepiped fitting portion 126B, and a flange 126C that is formed to project at the connecting position thereof and functions as a guide plate (see FIG. 4). Therefore, when the motor is driven (forward or reverse), the moving piece 126 reciprocates along the guide groove 118 at a predetermined timing. It should be noted that the rotation speed of the motor may be set in advance, and the moving piece 126 may be reciprocated by controlling this rotation speed. Alternatively, limit switches may be provided at the starting point and the ending point of the moving section of the moving piece 126. By doing so, the moving piece 126 may be reciprocated. Another method is to detect the lock current of the motor and reciprocate the motor. The feed screw 122, the moving piece 126 and the motor described above correspond to the driving means in the present invention.

As shown in FIGS. 1, 4, and 5, the cleaner 128 that moves integrally with the moving piece 126 is composed of an upper cleaner 130 and a lower cleaner 132.

The upper cleaner 130 is substantially U-shaped, and a rectangular opening 134 into which the fitting portion 126 B of the moving piece 126 is separably fitted is formed in the middle portion thereof. Further, a pair of cleaner pieces 136 is formed on the inner sides of both sides of the upper cleaner 130. A cleaning pad 138 for cleaning the charging wire 106 is adhered to the inner surfaces of the cleaner piece 136 facing each other, and the charging wire 106 is positioned between the pair of pads 138 so as to be partially in contact with each other. A pair of cylindrical fitting protrusions 140 are formed between the cleaner pieces 136 on both sides.

The lower cleaner 132 is substantially U-shaped, which is slightly larger than the upper cleaner 130, and a pair of support protrusions 142 into which the pair of fitting protrusions 140 are separably fitted are formed at an intermediate portion in the longitudinal direction thereof. Has been done. Cleaning pads 144 for the shield case 84 are adhered to the outer surfaces of both ends (the rising portions) in the longitudinal direction of the lower cleaner 132, so that the inside of the shield case 84 of the discharger body 80 described above is adhered to. Partial contact with the sides. Further, a pad 146 for cleaning the grid wire 114 is adhered to the arc surface (the surface on the side of the photosensitive drum 24) of the lower cleaner 132, and is in partial contact with the grid wire 114.

The above-described discharger main body 80 and cleaning device main body 82 are integrated with each other by being assembled with the screw 148, and in this state, the cleaner 128 is arranged in the internal space thereof. .

The operation of this embodiment will be described below. First, the operation of the entire copying machine 12 will be briefly described. First, the scorotron 10 is preset at a predetermined position on the peripheral surface of the photosensitive drum 24 in the copying machine 12. In this set state, the grid wire 114 is arranged close to the peripheral surface of the photosensitive drum 24. When the copying machine 12 is used in this state, a predetermined voltage is applied to the charging wire 106 via the terminal 102 of the scorotron 10, and corona discharge occurs. In the corona discharge from the charging wire 106, since a constant control voltage is applied to the plurality of grid wires 114, the peripheral surface of the photosensitive drum 24 is uniformly charged with a predetermined charge (positive or negative) in the circumferential direction. Be charged to. That is, the charging wire 106 in the scorotron 10 is present for corona discharge, and the plurality of grid wires 114 are for improving the image quality by preventing the photoconductive photoconductor surface potential from exceeding a certain voltage. Exists in.

Next, scanning exposure by the exposure device 20 forms an electrostatic latent image according to the image of the original. That is, a part of the charge uniformly stored in the photoconductor on the peripheral surface of the photosensitive drum 24 is grounded by being exposed. As a result, an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 24. After that, the toner cartridge 38, the toner replenishing roller 42, and the toner 40 supplied by the brush roller 44 are adhered and developed by the developing roller 26 according to the electric charge. Almost at the same time, the sheet 50 is conveyed from the stocker 46 through the conveyance path 48 and comes into close contact with the peripheral surface of the photosensitive drum 24, and the image is transferred by the transfer charger 29. The sheet 50 on which the image is transferred is peeled from the photosensitive drum 24 by the peeling claw 30, and is then conveyed to the pressure fixing roller 68 by the conveyance path 60. After that, after being pressure-fixed by the pressure-fixing roller 68, the paper 50 is peeled from the pressure-fixing roller 68 by the peeling claw 70, and is ejected onto the tray 74 while being sandwiched by the pair of paper ejection rollers 72. .

After the paper 50 is peeled by the peeling claw 30, the toner 40 remaining on the peripheral surface of the photosensitive drum 24 is removed and cleaned by the cleaning brush roller 32 and the cleaning blade 34. After that, the charge is removed by the charge remover 36, and the charging by the scorotron 10 is started again.

Here, as the above-described operation is repeated, NO _X or the like may be attached to the surfaces of the charging wire 106 and the grid wire 114 to deteriorate the image. Therefore, in the scorotron 10 of this embodiment, the charging wire 106, the grid wire 114, and the inner surface of the shield case 84 are automatically cleaned. That is, when a motor (not shown) is driven (normal rotation, reverse rotation), the moving piece 126 reciprocates along the feed screw 122 at a predetermined timing. As a result, the upper cleaner 130 and the lower cleaner 132 connected to the moving piece 126 move integrally along the charging wire 106 and the grid wire 114. Therefore, the pad 138 of the upper cleaner 130 serves as the surface of the charging wire 106, the pad 146 of the lower cleaner 132 serves as the surface of the grid wire 114, and the pad 144 of the lower cleaner 132 serves as the inner surface of the shield case 84. Are cleaned.

On the other hand, not only the automatic cleaning by the cleaner 128, but also when the service person wipes and cleans it with alcohol or the like when it is heavily soiled or at regular maintenance, or when the charging wire 106 and the grid wire 114 deteriorate themselves. If the wire is broken or there is a possibility of it being broken, it is necessary to wipe or clean the charging wire 106 and the grid wire 114. The procedure in this case will be described below.

First, the scorotron 10 is extracted from the copying machine 12, and the screw 148 is removed. As a result, the discharger body 80 and the cleaner body 82 are separated. At the same time, the moving piece 126 and the remaining upper cleaner 130 and lower cleaner 132 are separated. Then, the upper cleaner 130 is separated from the lower cleaner 132. This state is the state shown in FIG. This allows the charging wire 106 to be wiped and cleaned in the state shown in FIG. 3 (C), and the grid wire 114 to be wiped and cleaned to be in the state shown in FIG. 3 (A). Can be done at. Therefore, the cleaning work can be performed without the charging wire 106 and the grid wire 114 interfering with each other.

Next, when the charging wire 106 is replaced, the tension coil spring 108 may be detached from the locking screw 94 in this separated state. When the grid wire 114 is to be replaced, the screws 90 that lock both ends of the grid wire 114 in this separated state can be loosened, so that the grid wire 114 can be separated from the grid wire 110 in sequence.

As described above, in this embodiment, the scorotron 10 is configured to be separable by the discharger main body 80 and the cleaning device main body 82, and the cleaner 128 is also separable centering on the charging wire 106. Not only can automatic cleaning be performed at the time of use, but also cleaning work and replacement work of the charging wire 106 and the grid wire 114 by a service person can be easily performed without interfering with each other. Further, the assembling work of the scorotron 10 after the work can be easily performed. Therefore, it is possible to reduce the service cost.

Further, since the cleaner 128 that is moved by the moving piece 126 is divided into the upper cleaner 130 and the lower cleaner 132, individual parts can be replaced as needed, and the compatibility is excellent. . That is, when the upper cleaner 130 that cleans the charging wire 106 that is easily deteriorated correspondingly wears the pad 138 early, it is possible to replace only the upper cleaner 130. is there.

Further, since the cleaner main body 82 is detachably attached to the charging wire 106 side of the discharger main body 80, the corona discharge from the charging wire 106 is not hindered when the photosensitive drum 24 is charged. .

Further, since the charging wire 106 and the grid wire 114 become an integral component after being stretched on the discharger main body 80, that is, they are not separated in wire units as in the prior art shown in FIG. Since the charging wire 106 and the grid wire 114 are not present, a stable stretched state can be maintained.

Further, in the present embodiment, the insulating blocks 86 and 88 are sandwiched only by the shield case 84 and assembled with each other by the screws 90, so that the workability of assembling the grid wire 114 can be improved. There is also an advantage.

In this embodiment, the scorotron 10 is applied to the copying machine 12, but the invention is not limited to this, and the present invention can be applied to any electrophotographic apparatus. For example, the present invention may be applied to an electrophotographic apparatus such as a laser beam printer or a plotter.

Further, in this embodiment, the cleaner 128 is divided into the moving piece 126, the upper cleaner 130, and the lower cleaner 132, and the cleaner piece 136 and the pad 138 for cleaning the charging wire 106 are provided on the upper cleaner 130 side. However, the present invention is not limited to this, and may be provided on the lower cleaner 132 side. In this case, there is an advantage that the pad 138 can be prevented from being caught by the charging wire 106 when the cleaner 128 is divided.

Furthermore, in the present embodiment, the lower cleaner 132 is an integrally molded product, but the invention is not limited to this, and both sides to which the pads 144 are bonded may be separable. For example, it can be separated by applying the fitting structure of the fitting portion 126B of the moving piece 126 and the opening 134 of the upper cleaner 130 shown in FIG. In this case, the upper cleaner 130 and the lower cleaner 132 can be separated when the discharger main body 80 and the cleaner main body 82 are separated from each other, and the lower cleaner 132 itself also first inserts the pad 144 into the lower cleaner 132. After detaching from the main body, the support protrusion 142 is gripped and rotated by approximately 90 degrees, so that there is an advantage that the lower cleaner 132 itself can be easily separated from the discharger main body 80.

Further, in the present embodiment, the discharger main body 80 and the cleaner main body 82 are assembled to each other with the screw 148, but the assembly structure is not limited to this, and for example, the insulating blocks 80 and 82 may be made of resin. It is also possible to integrally form a nail made of metal and assemble the discharger main body 80 and the cleaner main body 82 with one touch (in this case, the discharger main body 80 and the cleaner main body 82 in the longitudinal direction and the direction perpendicular to the longitudinal direction). It is preferable to also have a means for fine adjustment of assembly).

[0048]

[Effect of device]

 As described above, in the charging device for an electrophotographic apparatus according to the first aspect of the present invention, the cleaner body is detachably attached to the charging wire side of the discharger body, so that the charging wire and the grid wire are automatically cleaned. It also has the excellent effect that the service person can easily clean and replace the charging wire and the like.

The charging device for an electrophotographic apparatus according to a second aspect of the present invention is the charging device according to the first aspect of the present invention, in which the cleaner is separated from the charging wire into a discharger body side and a cleaner body side. Since it is possible, the cleaner can also be separated when separating the main body of the discharger and the main body of the cleaner, which makes it easier to perform the cleaning and replacement work of the charging wire etc. described above. Have an effect.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a charging device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the charging device of FIG. 1 is assembled.

3 shows the main body of the discharger of FIG. 1, FIG. 3 (A) is a plan view thereof, FIG. 3 (B) is a side view thereof, and FIG. 3 (C) is a bottom view thereof.

FIG. 4 is an exploded perspective view showing the cleaner shown in FIG.

FIG. 5 is a cross-sectional view showing a state in which the cleaner of FIG. 4 is assembled, which is cut along a surface of the charging device in a direction perpendicular to the longitudinal direction.

6 is a configuration diagram showing a schematic configuration of a copying machine including the charging device of FIG.

FIG. 7 shows a charging device according to a conventional example, FIG. 7 (A) is a side view thereof, and FIG. 7 (B) is a sectional view taken along line (B)-(B) of FIG. 7 (A).

FIG. 8 is a perspective view showing a charging device according to another conventional example.

[Explanation of symbols]

 10 Scorotron (Charging Device) 12 Copier (Electrophotographic Device) 24 Photosensitive Drum (Photoconductive Photoconductor) 80 Discharger Main Body 82 Cleaner Main Body 106 Charging Wire 114 Grid Wire 122 Feed Screw (Drive Means) 126 Moving Piece (Drive) Means) 128 cleaner 130 upper cleaner 132 lower cleaner 138 pad 146 pad 148 screw

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Michinori Matsui 3-5 Akasaka, Minato-ku, Tokyo Fuji Xerox Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. An electrophotographic apparatus for forming a toner image by forming an electrostatic latent image on the surface of a photoconductive photoconductor and developing the electrostatic latent image, wherein the surface of the photoconductive photoconductor is A charging wire that is charged by corona discharge and a plurality of charging wires are arranged between the charging wire and the surface of the photoconductive photoconductor, and the corona discharge from the charging wire is uniformly charged to the surface of the photoconductive photoconductor. A cleaning unit including: a discharger main body including: a grid wire; and a drive unit configured to move at least a cleaner disposed in partial contact with the charging wire and the grid wire along the charging wire and the grid wire. A charger main body for an electrophotographic apparatus, comprising: a cleaner main body, wherein the cleaner main body is detachably attached to the charging wire side of the discharger main body. Charging device for electrophotographic devices. 2. The charging device for an electrophotographic apparatus according to claim 1, wherein the cleaner is separable into a discharger body side and a cleaner body side with respect to the charging wire.