JP2017215512A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to remove an adhered toner on a photoreceptor.SOLUTION: An image forming apparatus, such as a printer 100 performs an image forming operation of forming an electrostatic latent image on a rotating photoreceptor 130, developing the electrostatic latent image with a toner to obtain a visible image, transferring the visible image to a transfer member or a recording sheet, and fixing the transferred visible image. The image forming apparatus includes a photoreceptor cleaning member, such as a photoreceptor cleaning roller 305 that can move to a contact position in contact with the surface of the photoreceptor and to a separation position separated from the surface of the photoreceptor and mechanically removes an adhered toner on the surface of the photoreceptor, and executes, during a non-image forming operation period, adhered toner removal control of moving the photoreceptor cleaning member located at the separation position during an image forming operation period to the contact position to be brought into contact with the surface of the photoreceptor, and thereby removing the adhered toner.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an image forming apparatus.

  Conventionally, an electrostatic latent image is formed on a photosensitive member, and a toner is attached to the electrostatic latent image by a developing device so that the toner image is visualized. The toner image is transferred onto a recording sheet, and then transferred onto the photosensitive member. There is known an image forming apparatus that cleans toner remaining in the toner.

  For example, Patent Document 1 discloses such an image forming apparatus, which is a direct transfer type image forming apparatus that directly transfers a toner image on a photoreceptor onto a recording sheet. The image forming apparatus includes a rotating brush roller that is disposed on the downstream side of the photosensitive member rotation direction with respect to the transfer portion and is a photosensitive member cleaning member that contacts the surface of the photosensitive member. During the image forming operation, a voltage is applied to the rotating brush roller by the voltage applying unit, and the transfer residual toner remaining on the surface of the photoconductor after being transferred to the rotating brush roller is electrically sucked and captured.

Usually, in a cleaning device that cleans the transfer residual toner during the image forming operation, it is difficult to remove the fixed toner after it has been fixed.
This problem is not limited to an image forming apparatus that cleans the surface of the photoreceptor using a rotating brush roller, but may also occur in an image forming apparatus that cleans the surface of the photoreceptor using a cleaning blade.

  In order to solve the above-described problems, the present invention forms an electrostatic latent image on a rotating photoconductor, develops the electrostatic latent image with toner, obtains a visible image, and transfers the visible image. In an image forming apparatus that performs an image forming operation of transferring to a member or a recording sheet and fixing the transferred visible image, a contact position that contacts the surface of the photoconductor and a spaced position that is separated from the surface of the photoconductor A photosensitive member cleaning member that is movable and mechanically removes the fixed toner on the surface of the photosensitive member; wherein the photosensitive member cleaning member that is positioned at the separated position during the non-image forming operation and the image forming operation; The toner is moved to the contact position and brought into contact with the surface of the photoconductor to execute fixed toner removal control for removing the fixed toner.

  According to the present invention, it is possible to obtain a specific effect that the fixed toner on the photoreceptor can be removed.

FIG. 2 is a cross-sectional view illustrating the overall configuration of the printer according to the invention. FIG. 3 is an enlarged cross-sectional view illustrating a main part of an image forming unit. FIG. 3 is an enlarged cross-sectional view illustrating a main part of an image forming unit. The figure which looked at the paper conveyance path of the printer of A4 specification from right above. FIG. 3 is a schematic configuration diagram of the periphery of a transfer unit in the printer according to the present embodiment when viewed from the rotation axis direction. FIG. 5 is a partial perspective view around a transfer unit during an image forming operation. FIG. 6 is a partial perspective view around a transfer unit during a non-image forming operation.

Hereinafter, an embodiment in which the present invention is applied to an electrophotographic printer (hereinafter simply referred to as a “printer”) 100 as an image forming apparatus will be described.
FIG. 1 is a cross-sectional view illustrating the overall configuration of a printer 100 according to the present invention, and FIGS. 2 and 3 are cross-sectional views illustrating an enlarged main part of an image forming unit. The printer 100 is a monochrome direct transfer type printer.
As shown in FIG. 1, the printer 100 includes a process cartridge 110 that is an image forming unit, a transfer roller 150 that is a transfer unit, a fixing device 160, a paper feed tray 170, a recording paper transport device 180, toner, A foreign matter accumulating member 210 for accumulating powdered foreign matter including paper dust. The transfer roller 150 and the foreign material accumulating member 210 constitute a transfer device. Hereinafter, a powdery foreign substance made of toner or paper powder is simply referred to as “foreign substance”.

  The process cartridge 110 is disposed at a substantially central portion of the printer 100. The process cartridge 110 includes a charging device 115, an exposure device 120, a drum-shaped photoconductor 130, and a developing device 140. The charging device 115 uniformly charges the surface of the photoreceptor 130. The exposure device 120 is disposed above the photoconductor 130, exposes the photoconductor 130 based on image information, and forms a latent image on the surface of the photoconductor 130. As shown in FIGS. 2 and 3, the developing device 140 includes a developing roller 141 that attaches toner to the photoreceptor 130, a toner supply roller 142 that supplies toner to the developing roller 141, and toner conveyance that conveys toner while frictionally charging the toner. A screw 143 is provided, and a toner image is formed by attaching toner to the latent image formed on the photoreceptor 130.

  The transfer roller 150 is disposed below the photoconductor 130 and transfers the toner image formed on the photoconductor 130 onto a recording sheet conveyed along the pre-transfer guide member 191 between the photoconductor 130. The transfer roller 150 is applied with a high potential, and transfers a toner image formed on the surface of the photoreceptor 130 to a recording sheet by providing a potential difference between the photoreceptor 130 and the transfer roller 150.

  The fixing device 160 transfers the toner image passing between the two rollers and heat-presses the recording paper conveyed along the guide member 192 after transfer to fix the toner image on the recording paper. The paper feed tray 170 is disposed below the transfer roller 150 in the printer 100 and stores a plurality of recording sheets. The recording paper transport device 180 takes out the recording paper one by one from the paper feed tray 170 and transports it to the nip formed by the photoconductor 130 and the transfer roller 150, and further transports this recording paper to the fixing device 160. , And eject it to the output tray The foreign material accumulating member 210 is disposed under the transfer roller 150 and accumulates falling foreign materials.

  As shown in FIG. 2, the transfer device includes a transfer roller 150 and a foreign matter accumulation member 210. The foreign material accumulating member 210 includes a bottom wall member 211 made of a rectangular plate material having long sides in the width direction of the recording paper to be conveyed. In addition, the foreign material accumulating member 210 includes two vertical wall members 212 and 213 provided on the long side of the bottom wall member 211 and two short side vertical wall members provided on the short side. Each of the vertical wall members 212 and 213 and the short side vertical wall member is made of a plate material.

  The bottom wall member 211 is formed larger than the planar projection area of the transfer roller 150. Further, two horizontal wall members are formed at the leading ends of the vertical wall members 212 and 213 so as to form gaps 214 and 215 that are formed toward the transfer roller 150 and allow foreign matter to enter between the transfer roller 150 and the vertical wall members 212 and 213. . This lateral wall member is formed of a plate-like member and is arranged with a gradient that descends toward the transfer means.

  In the printer 100 of this embodiment, foreign matter enters the foreign matter accumulating member 210 from the gap portions 214 and 215 and accumulates on the bottom wall member 211. Further, even if the accumulated foreign matter soars due to the airflow caused by the rotation of the transfer roller 150, the two horizontal wall members prevent the foreign matter from moving upward. Accordingly, it is possible to prevent the toner or the like from coming out of the gaps 214 and 215 and entering the paper transport path to contaminate the surface of the recording paper guide. Further, since the two lateral wall members are arranged with a gradient, the foreign matter dropped on the lateral wall member moves on the upper surface of the lateral wall member and smoothly moves from the gaps 214 and 215 into the foreign matter accumulating member 210.

Next, an image forming operation of the image forming apparatus according to the present embodiment will be described.
When the image forming operation is started, the photoconductor 130 is rotationally driven, and the surface of the photoconductor 130 is uniformly charged to a predetermined polarity by the charging roller of the charging device 115. An electrostatic latent image is formed on the charged surface of the photoreceptor 130 by exposure from the exposure device 120 based on image information from a reading device or a computer. As the electrostatic latent image formed on the photoreceptor 130 is supplied with toner by the developing device 140, the electrostatic latent image is visualized (visualized) as a toner image.

  When the image forming operation is started, the paper feed roller starts to rotate, and the recording paper is sent out from the paper feed tray 170. The fed recording paper is temporarily stopped by the registration rollers. Thereafter, rotation of the registration roller is started at a predetermined timing, and the recording paper is conveyed to the transfer nip in accordance with the timing at which the toner image on the photoreceptor 130 reaches the transfer nip.

  At this time, a transfer voltage having a polarity opposite to the toner charging polarity of the toner image on the photoreceptor 130 is applied to the transfer roller 150, thereby forming a transfer electric field in the transfer portion. Then, the toner image on the photoreceptor 130 is transferred onto the recording paper by this transfer electric field. The residual toner on the photoreceptor 130 that could not be transferred onto the recording paper is removed by a cleaning blade.

  The recording paper on which the toner image has been transferred is conveyed to the fixing device 160 and heated and pressurized by passing through the fixing nip between the fixing roller and the pressure roller, so that the toner image on the recording paper is fixed. Is done. Then, the recording paper is discharged out of the apparatus by the paper discharge roller and is stocked on the paper discharge tray.

Next, features of the present invention will be described.
In a normal image forming apparatus, a latent image is formed by exposing a manuscript image onto a uniformly charged photoreceptor with a charger, and then a toner is attached to the latent image with a developing device to visualize it as a toner image. ing. This toner image is transferred to a recording sheet or an intermediate transfer member by a transfer device, and the toner remaining on the photosensitive member after transfer is removed from the photosensitive member by a cleaning device. In a direct transfer type image forming apparatus, a latent image on a photosensitive member is directly transferred onto a recording sheet by a transfer roller, and then a document image is fixed on the recording sheet by a fixing device. As an obstacle in the image forming apparatus, there is a phenomenon that a toner component adheres to the surface of the photoreceptor. The toner fixed on the photosensitive member grows, scratches the cleaning blade that is in contact with the photosensitive member as a cleaning device, passes through the cleaning blade, and the cleaning blade is scratched on the charging roller. Vertical streak-like toner stains appear at the position, and vertical streak image defects also occur in the paper image.

FIG. 4 is a view of the sheet transport path of the A4 specification printer as viewed from directly above.
In the direct transfer type printer of this embodiment, the toner image formed on the photoconductor is directly transferred to the recording paper by the transfer roller 150. When a small-size A5 specification recording sheet is used, a small amount of toner adheres to the photoreceptor corresponding to a portion outside the width in the direction orthogonal to the conveyance direction of the A5 specification recording sheet. When the printing of the A5 specification recording paper continues, the toner surface adhering to the surface X corresponding to the portion X outside the width of the A5 specification does not cause the recording paper to be rubbed. Sticking grows. For this reason, when printing is performed using an A4 specification recording sheet thereafter, a vertical streak-like image defect occurs in the recording sheet due to the fixed toner.

  The fixing of the toner component on the photosensitive member tends to occur when the amount of toner input to the cleaning blade 117 in FIG. 3 is small. For this reason, when printing on a small-size recording sheet continues, development is periodically performed over the entire image forming width, and toner fixation is suppressed by intentionally increasing the amount of toner input to the cleaning blade 117.

  However, as a demerit of the sticking suppression control by the discharge operation that forcibly consumes the sticking toner, a ratio of toner consumption that is not for outputting image information increases. For this reason, there is a problem in that the number of toner cartridges that can be output does not increase so much even though a small-size recording sheet with relatively little image information is used from the user's viewpoint.

FIG. 5 is a schematic configuration diagram of the periphery of the transfer unit in the printer of this embodiment as viewed from the direction of the rotation axis. FIG. 6 is a partial perspective view of the periphery of the transfer unit during the image forming operation. FIG. 7 is a partial perspective view of the periphery of the transfer unit during the non-image forming operation.
As shown in FIGS. 5 and 6, the transfer roller 150 is a support member that is integrally formed with a pre-transfer guide member 191 that is a guide member that guides a recording sheet to a transfer position in a linear direction in which the roller axis is a right angle. The transfer housing 301 is movably attached. Further, it is pressed toward the photosensitive member 130 via the bearing 302 and the transfer R biasing spring 303. The transfer housing 301 is rotatably attached to the printer body, and a torsion spring 304 provided on the rotation shaft pulls the transfer roller 150 from the paper feed tray 170 (the direction of arrow A in FIGS. 5 and 6). It is energizing in the direction (the direction of arrow B of Drawing 5 and Drawing 6) which moves to the device front which is.

  In the image forming operation, as shown in FIGS. 5 and 6, the paper feed tray 170 is pushed to the normal position, and the transfer housing 301 is pushed in using the stopper 171 attached to the paper feed tray 170, thereby transferring the image. The roller 150 is held at a transfer position (contact position) at the time of printing that contacts the photoreceptor 130.

  Further, a photosensitive member cleaning roller 305 is also attached to the transfer housing 301 so as to be movable in a linear direction perpendicular to the roller axis, and is directed toward the photosensitive member 130 via a bearing 306 and a photosensitive member cleaning roller biasing spring 307. It has a configuration that can be pressed. At the time of printing, the photoconductor cleaning roller 305 is held in the vertically lower space of the post-transfer guide member 192 by pressing the transfer housing 301. At this time, the photosensitive member cleaning roller 305 is held at a position (separated position) away from the photosensitive member 130 with the roller shaft position restricted by roller shaft restriction guides 193 provided at both end positions of the post-transfer guide member 192. .

  In the non-image forming operation, as shown in FIG. 7, when the paper feed tray 170 is pulled out in front of the apparatus in the pulling direction (the direction of arrow A in FIG. 7), the stopper 171 of the paper feed tray 170 is moved to the transfer housing 301. Get away from. The transfer housing 301 is rotated clockwise in FIG. 7 by the force of the torsion spring 304 and stops at a position where the photoconductor cleaning roller 305 contacts the photoconductor 130. Then, when the photosensitive member 130 is rotated by the driving unit, the photosensitive member cleaning roller 305 is driven and the initial fixed toner on the photosensitive member 130 can be finely polished and removed.

  As shown in FIG. 7, the transfer roller shaft 150a and the photoreceptor cleaning roller shaft 305a are provided with gears having the same specifications (number of gears, gear diameter, etc.) at the same axial position, and these gears are respectively photosensitive. It is configured to mesh with a gear provided at the axial end of the rotating shaft 130a of the body 130. When the photosensitive member 130 is driven, the transfer roller 150 is driven when the transfer roller 150 is in contact with the photosensitive member 130 (image forming operation), and when the photosensitive member 130 is in contact with the photosensitive member cleaning roller 305 (non-image). In the forming operation), the photosensitive member cleaning roller 305 can be driven. Accordingly, the surface of the photoconductor 130 can be cleaned by the photoconductor cleaning roller 305 with the same linear velocity difference as the rotation linear velocity difference between the transfer roller 150 and the photoconductor 130.

  Further, the gear provided on the photoconductor cleaning roller shaft 305a is different in axial position from the gear provided on the transfer roller shaft 150a. Accordingly, the rotation of the photoconductor 130 and the rotation of the photoconductor cleaning roller 305 are not linked, and the photoconductor cleaning roller 305 in contact with the photoconductor 130 can be driven independently of the drive of the photoconductor 130. Accordingly, the cleaning efficiency can be improved by rotating the photoconductor cleaning roller 305 with a linear speed difference larger than the rotation linear speed difference between the transfer roller 150 and the photoconductor 130.

  Further, when there is no sheet in the sheet feeding tray, an announcement for requesting the user to replenish the sheet is given on the liquid crystal panel display or the like, and at the same time, an announcement for performing the photoreceptor cleaning by the photoreceptor cleaning roller is performed. Accordingly, it is possible to avoid turning off the main power supply of the image forming apparatus main body when the recording paper is replenished, and it is possible to remove the fixed toner on the photoconductor when not printing. Further, the layer thickness of the photosensitive layer of the photosensitive member is finite, and there is a limit to scraping the surface of the photosensitive member with the photosensitive member cleaning roller. Therefore, the cleaning time by the photoconductor cleaning roller or the travel distance of the photoconductor is stored every time the fixed toner removal operation is executed, and this execution is performed based on the previous cleaning time by the photoconductor cleaning roller or the travel distance of the photoconductor. The cleaning time of the photosensitive member cleaning roller or the traveling distance of the photosensitive member is determined. Accordingly, by not performing the photoconductor cleaning more than necessary, it is possible to extend the life of the photoconductor, shorten the photoconductor cleaning operation time, and shorten the waiting time of the user.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect A)
An electrostatic latent image is formed on the rotating photoconductor 130, the electrostatic latent image is developed with toner to obtain a visible image, the visible image is transferred to a transfer member or a recording sheet, and the transferred image is transferred. In an image forming apparatus such as the printer 100 that performs an image forming operation for fixing a visual image, the image forming apparatus can move to a contact position that contacts the surface of the photoconductor and a separation position that is separated from the surface of the photoconductor, and the photosensitivity. A photosensitive member cleaning member such as a photosensitive member cleaning roller 305 that mechanically removes the fixed toner on the surface of the body, and the photosensitive member cleaning member positioned at the separated position during the non-image forming operation or the image forming operation; It is moved to a contact position and brought into contact with the surface of the photoconductor to execute fixed toner removal control for removing the fixed toner.
According to this aspect, the photosensitive member cleaning member is a dedicated cleaning member that abuts against the surface of the photosensitive member and mechanically removes the fixed toner on the surface of the photosensitive member during a non-image forming operation. Thereby, it is possible to remove the fixed toner that could not be removed by the conventional configuration of cleaning the transfer residual toner on the surface of the photosensitive member during the image forming operation.

(Aspect B)
In (Aspect A), the transfer position includes a transfer roller 150 that transfers the visible image formed on the photoconductor to a transfer member or a recording paper, and the transfer roller contacts the surface of the photoconductor during an image forming operation. In the non-image forming operation, the transfer roller is moved to a non-transfer position that is separated from the surface of the photoconductor, and the photoconductor cleaning member is moved to the transfer position and brought into contact with the surface of the photoconductor. It is a feature.
According to this aspect, the transfer roller is a member that is in contact with the surface of the photoconductor at the transfer position, and the photoconductor cleaning member is brought into contact with the surface of the photoconductor in place of the transfer roller during a non-image forming operation. The contact position also serves as a transfer position, and a space for contacting the photoconductor cleaning member can be secured in a limited space around the photoconductor.

(Aspect C)
In (Aspect A) or (Aspect B), the image forming apparatus includes a support member such as a transfer housing 301 that rotatably supports the transfer roller and the cleaning member with respect to the main body of the image forming apparatus. A torsion spring 304 is provided.
According to this aspect, it is possible to obtain a driving force for rotating the support member with an inexpensive and simple configuration.

(Aspect D)
In (Aspect A) to (Aspect C), a paper feed tray 170 for storing recording paper is provided, and when the paper feed tray is pulled out from the apparatus main body, the cleaning member is brought into contact with the surface of the photoconductor. It is characterized by.
According to this aspect, it is possible to remove the initially fixed toner on the photoreceptor by executing the fixed toner removing operation at the timing of paper replacement.

(Aspect E)
In (Aspect D), there is provided a regulating member such as a stopper 171 for regulating an axial rotation posture of the support member so that the transfer roller is positioned at a transfer position and contacts the surface of the photoconductor. It is.
According to this aspect, the shaft rotation posture of the support member can be interlocked with the front and rear positions of the paper feed tray with an inexpensive and simple configuration.

(Aspect F)
(Aspect A) to (Espect E) are characterized in that a guide member such as a pre-transfer guide member 191 that guides a recording sheet to a transfer position is provided, and the support member is configured integrally with the guide member. Is.
According to this aspect, since the guide member rotates together with the transfer roller, a separation mechanism for avoiding the transfer roller from interfering with the guide member during the rotation becomes unnecessary. Furthermore, since the end of the guide member on the downstream side of the recording sheet passing direction in the recording sheet conveyance direction can be brought close to the transfer roller, the recording sheet conveyance quality before transfer can be ensured.

(Aspect G)
In (Aspect A) to (Aspect F), when the photosensitive member cleaning member is not in contact with the surface of the photosensitive member, the photosensitive member cleaning member is retracted from a recording paper conveyance path. is there.
According to this aspect, avoidance of interference between the photosensitive member cleaning member and the guide member can be realized with an inexpensive and simple configuration.

(Aspect H)
In (Aspect A) to (Aspect G), the photosensitive member cleaning member is formed of a roller-shaped member, and the roller shaft 150a of the transfer roller and the roller shaft 130a of the photosensitive member cleaning member are parallel to each other, and have the same specifications. Is provided at the end of each shaft and meshes with the gear provided at the end of the shaft of the photosensitive member.
According to this aspect, by driving the photosensitive member, the transfer roller can be driven when the transfer roller and the photosensitive member contact each other, and the ring solid cleaning member can be driven when the photosensitive member cleaning member and the photosensitive member contact each other. . As a result, there is no need to provide a drive mechanism for the roller-shaped photosensitive member cleaning member, which is advantageous in terms of cost and apparatus size suppression.

(Aspect I)
In (Aspect H), the gear provided on the roller shaft 305a of the photosensitive member cleaning member is different in installation position from the gear provided on the roller shaft of the transfer roller.
According to this aspect, the rotation of the photoconductor and the rotation of the roller-shaped photoconductor cleaning member are not interlocked, and the photoconductor cleaning member in contact with the photoconductor can be driven independently of the photoconductor drive. Since the rotation speed of the photosensitive member can be decreased and the relative speed of the roller-shaped photosensitive member cleaning member in contact with the photosensitive member can be increased, the linear velocity difference is large and the effect of cleaning the surface of the photosensitive member is easily obtained.

(Aspect J)
In (Aspect A) to (Aspect I), based on the cleaning time or the travel distance of the photosensitive member that is executed last time, the cleaning time or the travel distance of the photosensitive member that is executed this time is calculated based on the cleaning time or the travel distance of the photosensitive member. It is characterized by determining.
According to this aspect, the layer thickness of the photosensitive layer of the photosensitive member is finite, and there is a limit to scraping the surface of the photosensitive member with the photosensitive member cleaning member, so that the photosensitive member is not cleaned more than necessary. Extends life. Furthermore, the photosensitive member cleaning operation time can be shortened to shorten the waiting time of the user.

DESCRIPTION OF SYMBOLS 100 Printer 101 Process cartridge 115 Charging device 120 Exposure device 130 Photoconductor 140 Developing device 141 Developing roller 142 Toner supply roller 143 Toner transport screw 150 Transfer roller 150a Transfer roller shaft 160 Fixing device 170 Paper feed tray 180 Recording paper transport device 191 Before transfer Guide member 192 Post-transfer guide member 193 Roller shaft regulating guide member 210 Foreign matter accumulating member 301 Transfer housing 302 Bearing 303 Transfer R biasing spring 304 Torsion spring 305 Photoconductor cleaning roller 305a Photoconductor cleaning roller shaft 306 Bearing 307 With photoconductor cleaning roller Force spring

Japanese Patent No. 3587615

Claims (10)

An electrostatic latent image is formed on a rotating photoconductor, the electrostatic latent image is developed with toner to obtain a visible image, the visible image is transferred to a transfer member or recording paper, and the transferred visible image is transferred. In an image forming apparatus that performs an image forming operation for fixing an image,
A photosensitive member cleaning member that is movable to a contact position that contacts the surface of the photosensitive member and a separated position that is separated from the surface of the photosensitive member, and mechanically removes the fixed toner on the surface of the photosensitive member;
At the time of non-image forming operation, fixed toner removal control for removing the fixed toner by moving the photosensitive member cleaning member positioned at the separated position to the contact position and contacting the surface of the photosensitive member at the time of image forming operation. An image forming apparatus that executes the image forming apparatus. The image forming apparatus according to claim 1.
A transfer roller for transferring the visible image formed on the photoconductor to a transfer member or a recording sheet is provided. During image forming operation, the transfer roller is moved to a transfer position that contacts the surface of the photoconductor to form a non-image. An image forming apparatus, wherein, in operation, the transfer roller is moved to a non-transfer position where the transfer roller is separated from the surface of the photoconductor, and the photoconductor cleaning member is moved to the transfer position and brought into contact with the surface of the photoconductor. The image forming apparatus according to claim 1, wherein
An image forming apparatus comprising: a support member that rotatably supports the transfer roller and the photosensitive member cleaning member with respect to a main body of the image forming apparatus; and a torsion spring provided on a rotation shaft of the support member. The image forming apparatus according to any one of claims 1 to 3,
An image forming apparatus having a paper feed tray for storing recording paper, wherein the photoconductor cleaning member is brought into contact with the surface of the photoconductor when the paper feed tray is pulled out from the main body of the image forming apparatus. The image forming apparatus according to claim 4.
An image forming apparatus, comprising: a regulating member that regulates an axis rotation posture of the support member so that the transfer roller is positioned at a transfer position and contacts the surface of the photoconductor. The image forming apparatus according to any one of claims 1 to 5,
Provided with a guide member for guiding the recording paper to the transfer location,
The image forming apparatus, wherein the support member is configured integrally with the guide member. The image forming apparatus according to any one of claims 1 to 6,
2. An image forming apparatus according to claim 1, wherein when the photosensitive member cleaning member is not in contact with the surface of the photosensitive member, the photosensitive member cleaning member is retracted from a recording paper conveyance path. The image forming apparatus according to any one of claims 1 to 7,
The photosensitive member cleaning member is formed of a roller-shaped member, the roller shaft of the transfer roller and the roller shaft of the photosensitive member cleaning member are parallel to each other, and gears having the same specifications are provided at the end of each shaft, An image forming apparatus that meshes with a gear provided at an end of a shaft of a photosensitive member. The image forming apparatus according to any one of claims 1 to 7,
The photoconductor cleaning member is formed of a roller-shaped member, and the gear provided on the roller shaft of the photoconductor cleaning member is different in installation position from the gear provided on the roller shaft of the transfer roller, and the photoconductor An image forming apparatus, wherein the cleaning member rotates independently of the rotation of the photosensitive member. The image forming apparatus according to any one of claims 1 to 9,
An image forming apparatus, wherein a cleaning time or a travel distance of a photoconductor that is executed this time is determined based on a cleaning time or a travel distance of the photoconductor that is executed last time.