JP2006053448A - Image forming apparatus and process cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an image forming apparatus which is equipped with a photoreceptor on which a toner image is formed, a transfer belt wound round a plurality of rollers including a driving roller, a photoreceptor driving motor for rotationally driving the photoreceptor, and a belt driving motor for rotationally driving the driving roller so as to rotate the transfer belt, and which prevents the quality of an obtained image from being deteriorated even when the surface linear velocity of a transfer belt is changed because temperature in an image forming apparatus main body rises, and a driving roller is expanded and then the diameter of the driving roller gets larger. <P>SOLUTION: The image forming apparatus is equipped with a temperature sensor 67 detecting the temperature in the image forming apparatus main body, and a controller for controlling the revolving speed of at least either the photoreceptor driving motor 35 or the belt driving motor based on the result of detection by the temperature sensor 67. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a photosensitive member on which a toner image is formed, a transfer belt wound around a plurality of rollers including a driving roller, a photosensitive member driving motor that rotationally drives the photosensitive member, and to rotate the transfer belt. The present invention relates to an image forming apparatus including a belt drive motor that rotationally drives the drive roller, and a process cartridge.

  An image forming apparatus of the above type configured as an electronic copying machine, a printer, a facsimile, or a complex machine of these is well known (for example, see Patent Document 1). This type of image forming apparatus includes a direct transfer type image forming apparatus that obtains a recorded image by transferring a toner image formed on a photoconductor onto a recording medium carried on a transfer belt and formed on a photoconductor. The toner image is roughly divided into an intermediate transfer type image forming apparatus that transfers the toner image to a transfer belt and transfers the toner image transferred to the transfer belt to a recording medium to obtain a recorded image.

  In any type of image forming apparatus, the rotational speed of the photosensitive member driving motor and the rotational speed of the belt driving motor are the same in surface linear velocity of the photosensitive member and the transfer belt, or a slight difference between the two linear velocity. The toner image formed on the photosensitive member is correctly transferred to a recording medium or a transfer belt. However, when the temperature in the image forming apparatus main body rises greatly, for example, the drive roller around which the transfer belt is wound expands and its diameter increases, so that the linear velocity of the transfer belt increases, and the transfer belt becomes faster. The two linear velocities of the belt and the photosensitive member cannot maintain the above-described predetermined relationship. As a result, the toner image transferred from the photosensitive member to the recording medium or the transfer belt has uneven density and color shift, and the image quality deteriorates. There is a risk.

Japanese Patent Laid-Open No. 2002-311672

  An object of the present invention is to provide an image forming apparatus capable of effectively suppressing the occurrence of the above-described problems even when the temperature in the main body of the image forming apparatus rises, and a process cartridge used in the image forming apparatus. There is.

  To achieve the above object, the present invention provides a photoreceptor on which a toner image is formed, a transfer belt wound around a plurality of rollers including a drive roller, a photoreceptor drive motor that rotationally drives the photoreceptor, A belt drive motor for rotating the drive roller to rotate the transfer belt; and transferring the toner image formed on the photoconductor onto a recording medium carried by the transfer belt. In an image forming apparatus that obtains a recorded image, a temperature sensor that detects the temperature in the image forming apparatus main body, and the number of rotations of at least one of the photoconductor drive motor and the belt drive motor is determined based on a detection result of the temperature sensor. An image forming apparatus comprising a control device for controlling is proposed.

  Similarly, in order to achieve the above object, the present invention provides a photoconductor on which a toner image is formed, a transfer belt wound around a plurality of rollers including a drive roller, and a photoconductor drive motor that rotationally drives the photoconductor. And a belt drive motor for rotating the drive roller to rotate the transfer belt, and the toner image formed on the photoconductor is transferred to the transfer belt and transferred to the transfer belt. In an image forming apparatus that obtains a recorded image by transferring a toner image to a recording medium, a temperature sensor that detects a temperature in the main body of the image forming apparatus, and the photosensitive member driving motor and the belt based on a detection result of the temperature sensor An image forming apparatus comprising a control device for controlling the rotational speed of at least one of the drive motors is proposed (claim 2).

  The image forming apparatus according to claim 1, further comprising: a drive shaft that is rotationally driven by the photoconductor drive motor; and a claw member provided on the drive shaft. The engaging shaft is detachably fitted to the drive shaft and has an engaging portion that can be engaged with and disengaged from the claw member. When the engaging portion and the claw member are engaged, the rotation of the driving shaft is applied to the photosensitive member. It is advantageous if the photoconductor is configured to be rotated by the photoconductor drive motor via a drive shaft.

  Furthermore, in the present invention, in order to achieve the above object, the photoconductor of claim 1 or 2 and at least one process device for forming a toner image on the photoconductor are integrally assembled. A process cartridge is proposed (claim 4).

  According to the present invention, a high-quality image can be formed even when the temperature in the image forming apparatus main body rises.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing an example of an image forming apparatus. The image forming apparatus shown here has a plurality of photoconductors 3Y, 3M, 3C, and 3BK arranged in a main body 1 thereof. A yellow toner image, a magenta toner image, a cyan toner image, and a black toner image are formed on each of the photoreceptors 3Y, 3M, 3C, and 3BK. When it is necessary to identify these photoconductors, these photoconductors are referred to as first, second, third and fourth photoconductors, which are indicated by reference numerals 3Y, 3M, 3C and 3BK. When the body is not specifically identified and is shown generically, it will be denoted by reference numeral 3. A transfer belt 4 is disposed opposite to the photoreceptors 3Y to 3BK, and the transfer belt 4 is wound around a plurality of rollers 60, 61, 62, and 63. One of these rollers 60 is a drive roller. A concentric drive gear 64 is fixed to the drive roller 60, and an output gear 66 of a belt drive motor 65 is engaged with the drive gear 64. When the belt drive motor 65 starts to operate, the rotation of the output gear 66 is transmitted to the drive roller 60 via the drive gear 64, whereby the transfer belt 4 is driven to travel in the direction of arrow A.

  Since the operation of the toner image is substantially the same as that of the first to fourth photoconductors 3Y, 3M, 3C, and 3BK, the toner image is formed on the first photoconductor 3Y. Just explain. FIG. 2 is an enlarged view of the photoreceptor 3Y and process equipment provided around the photoreceptor 3Y. The photoconductor 3Y is rotated clockwise in FIGS. 1 and 2, and at this time, the surface of the first photoconductor 3Y is uniformly charged to a predetermined polarity by the charging roller 7. Next, the charged surface is irradiated with a light-modulated laser beam L emitted from the laser writing unit 8. As a result, an electrostatic latent image is formed on the first photoconductor 3Y, and the electrostatic latent image is visualized as a yellow toner image by the developing device 9. The developing device 9 shown here has a developing roller 31 that is rotationally driven, and the electrostatic latent image is visualized by the dry developer DS carried on the developing roller 31.

  On the other hand, a recording medium P made of, for example, transfer paper or a resin film is fed in a direction indicated by an arrow B from a paper supply unit 5 disposed at the lower part of the image forming apparatus main body 1, and the recording medium P is a first recording medium P. Is fed between the photosensitive member 3Y and the transfer belt 4, and is carried by the transfer belt 4 and conveyed. A transfer roller 10 is disposed at a position substantially opposite to the first photoconductor 3Y across the transfer belt 4, and the yellow toner image on the first photoconductor 3Y is transferred to the recording medium P by the action of the transfer roller 10. Transcribed above. The transfer residual toner that is not transferred to the recording medium P and remains on the first photoconductor 3Y is removed by the cleaning device 11.

  In exactly the same manner, magenta toner images, cyan toner images, and black toner images are respectively formed on the second to fourth photoreceptors 3M, 3C, and 3BK shown in FIG. 1, and these toner images are converted into yellow toner images. Are sequentially transferred onto the recording medium P having been transferred. The recording medium P carrying the four-color unfixed toner images in this manner is sent to the fixing device 2 and passes between the pair of fixing rollers 2A and 2B of the fixing device 2. At this time, the toner image is fixed on the recording medium P by the action of heat and pressure, and the recording medium that has passed through the fixing device 2 is discharged onto the paper discharge unit 6 as indicated by the arrow C direction.

  Around each photosensitive member 3, a plurality of process devices for forming a toner image on the photosensitive member, that is, a charging roller 7, a developing device 9, a cleaning device 11, and the like are provided. At this time, the photosensitive member 3 and at least one process device for forming a toner image on the photosensitive member 3 are integrally assembled to form a process cartridge, and the process cartridge can be attached to and detached from the image forming apparatus main body. It can be configured to be worn. In the example shown in FIG. 2, the process roller 71 is configured by integrally assembling the charging roller 7, the developing device 9, each process device of the cleaning device 11, and the photosensitive member 3. That is, the charging roller 7 is supported by the case 72 of the process cartridge 71, and a developing case 78 of the developing device 9 is configured by a part of the case 72. The developing roller 31 and the developer conveying screw are included in the developing case 78. 79A and 79B are rotatably supported, and the doctor blade 80 and the toner density sensor 81 are supported by the developing case 78. The developing roller 31 is positioned close to the surface of the photoreceptor 3, and the doctor blade 80 is positioned so that the tip portion is close to the surface of the developing roller 31. The developing case 78 contains a dry developer DS having toner and a carrier.

  When the conveying screws 79A and 79B are rotated, the toner and carrier of the developer DS are frictionally charged in opposite polarities, and the developing roller 31 is rotationally driven in the counterclockwise direction in FIG. The DS is carried and conveyed in the rotation direction of the developing roller 31. At this time, the layer thickness of the developer on the developing roller 31 is regulated by the doctor blade 80, and the developer that has passed through the doctor blade 80 is conveyed to the developing region between the developing roller 31 and the photosensitive member 3, where The toner is electrostatically transferred to the electrostatic latent image, and the latent image is visualized as a toner image.

  When the toner concentration sensor 81 detects that the toner concentration of the developer DS stored in the developing case 78 has decreased, the toner stored in the toner storage container 82 indicated by a two-dot chain line in FIG. The toner is supplied to the developing case 78 by the pump 83.

  Further, a cleaning case 73 of the cleaning device 11 is formed by a part of the case 72, and a base end portion of the cleaning blade 74 is fixed to the cleaning case 73 via a blade holder 75, and the cleaning brush 76 is attached to the cleaning case 73. The toner conveying screw 77 is rotatably supported. Both the cleaning blade 74 and the cleaning brush 76 are in contact with the circumferential surface of the photoconductor body 50 formed in the cylindrical shape of the photoconductor 3. Transfer residual toner adhering to the surface of the photoconductor after the toner image is transferred is removed from the surface of the photoconductor by the cooperative action of the cleaning brush 76 and the cleaning blade 74 of the cleaning device 11. The removed toner is conveyed outside the cleaning case 73 by the toner conveying screw 77.

  In the process cartridge 71 shown in FIG. 3, the developing device 9 shown in FIGS. 1 and 2 is configured as an element different from the process cartridge 71. Other configurations of the process cartridge 71 shown in FIG. 3 are the same as those of the process cartridge 71 shown in FIG. Two process cartridges 71 shown in FIGS. 2 and 3 are arranged along the transfer belt 4 as shown in FIG.

  FIG. 4 is a cross-sectional view showing the photosensitive member 3 of the process cartridge and the transmission device 12 that transmits the rotation to the photosensitive member 3. The photosensitive members 3Y, 3M, 3C, and 3BK of the process cartridges 71 shown in FIG. 1 are all supported in the same manner and can transmit rotation to the photosensitive members 3Y to 3BK. 4 and 5 show the structure of these photoconductors, the support structure thereof, the configuration of a transmission device that transmits rotation to each photoconductor, and the like. In these drawings, other elements of the process cartridge are shown. Is not shown.

  4 indicates the front side of the image forming apparatus main body 1, and R indicates the back side thereof. The main body frame 13 of the image forming apparatus main body 1 has a front plate 14 positioned on the front side of the main body 1. A back plate 15 located on the back side, a stay 16 for fixing and connecting these side plates 14 and 15, and a main body bracket 17 fixed to the back plate 15 by screws (not shown). The photoconductor 3 includes the above-described photoconductor body 50, and the front flange 18 and the back flange 19 that are press-fitted and fixed to each end in the axial direction of the photoconductor body 50. As described above, a toner image is formed. The front flange 18 and the back flange 19 are detachably fitted and fixed to the drive shaft 20 as will be described later, and the drive shaft 20 and the photoreceptor 3 are configured to rotate together.

  A positioning member 22 is detachably fixed to the front plate 14 by a plurality of screws 21, and a front flange 18 is rotatably supported by the positioning member 22 via a bearing 23. Further, the front end of the drive shaft 20 is detachably fitted to the front flange 18. The front flange 18 and the front side portion of the drive shaft 20 pass through an opening 24 formed in the front plate 14.

  The back portion of the drive shaft 20 extends through the back plate 15 and the body bracket 17 and is rotatably supported by a pair of rolling bearings 26 and 27 held by a cylindrical holder 25. The holder 25 is detachably fixed to the back side plate 15 by screws 28. Further, the outer rings of the respective rolling bearings 26 and 27 are fitted into the holes 29 and 30 formed in the rear side plate 15 and the main body bracket 17 without rattling, whereby the both rolling bearings 26 and 27 and the holder 25 are connected to the main body frame. 13 is positioned. In this way, the drive shaft 20 is correctly positioned with respect to the main body frame 13 and is rotatably supported, and the front flange 18 and the back flange 19 of the photoreceptor 3 are supported concentrically with the drive shaft 20. Further, the front flange 18 and the back flange 19 of the photoreceptor 3 are rotatably assembled to the case 71 of the process cartridge 71 shown in FIGS.

  The transmission device 12 shown in FIG. 4 includes a drive shaft 20 that is rotatably supported as described above, a gear 32 that is fixed to the drive shaft 20 so as to rotate together with the drive shaft 20, and a rear side. And a connecting device 34 that removably connects the flange 19 to the drive shaft 20. The gear 32 is disposed at the back end of the drive shaft 20 and is disposed concentrically with the drive shaft 20. A photoconductor drive motor 35 is supported on the main body bracket 17, and an output gear 36 fixed to the output shaft meshes with the gear 32 described above. The rotation of the photoconductor drive motor 35 is transmitted to the drive shaft 20 via the output gear 36 and the gear 32, and the rotation of the drive shaft 20 is transmitted to the back flange 19 of the photoconductor 3 via the coupling device 34. The photoreceptor 3 is driven to rotate in the clockwise direction in FIG.

  The photosensitive member 3 can be attached to and detached from the driving shaft 20 by moving the photosensitive member 3 in the direction of the axis X with respect to the driving shaft 20, but FIG. 5 drives the back flange 19 of the photosensitive member 3. The state when it is made to detach | leave from the axis | shaft 20 is shown. As shown in FIG. 5, the coupling device 34 has a claw member 37 that is fitted to the drive shaft 20 so as to be movable in a predetermined stroke in the axis X direction, and the claw member 37 is attached to the drive shaft 20 in the axial direction. The pin 40 is fixed to the drive shaft 20, and a long hole 41 formed in the claw member 37 is slidable in the direction of the axis X of the drive shaft 20. It is mated. In the state shown in FIG. 5, the claw member 37 is pressed by the compression spring 39, the pin 40 is pressed against one end of the long hole 41, and the claw member 37 is held at the position shown in FIG. . When the pin 40 fixed to the drive shaft 20 is fitted into the long hole 41 of the claw member 37, the claw member 37 is prohibited from rotating with respect to the drive shaft 20.

  On the other hand, the back flange 19 of the photoreceptor 3 is formed with an engaging portion composed of a plurality of engaging grooves 38 arranged in an annular shape. The photosensitive member 3 is moved as shown by an arrow D in FIG. 5, and the driving shaft 20 is inserted into the rear flange 19 and the front flange 18 (FIG. 4) to fit the photosensitive member 3 to the driving shaft 20. When the photosensitive member 3 is assembled to the main body frame 13 as shown in FIG. 4, the claw member 37 is pressed against the back flange 19 by the compression spring 39, and a plurality of claw members 37 are formed in the circumferential direction of the claw member 37. The claw 42 engages with the engaging portion formed by the engaging groove 38 of the back flange 19, and relative rotation between the photosensitive member and the drive shaft 20 is prohibited. As described above, the photosensitive member 3 is fitted to the drive shaft 20 of the transmission device 12 and is attached to the drive shaft 20 via the claw member 37 attached to the drive shaft 20 so as to rotate together with the drive shaft 20. Connected. Conversely, by moving the photosensitive member 3 along the drive shaft 20 in the direction opposite to the arrow D, the engagement between the claw member 37 and the engaging portion formed by the engaging groove 38 can be released.

  As described above, the photosensitive member 3 can be attached to and detached from the drive shaft 20. Therefore, the photosensitive member 3 is moved from the main body frame 13 to the front side by removing the positioning member 22 shown in FIG. It can be pulled out. That is, the entire process cartridge 71 shown in FIGS. 2 and 3 can be taken out from the image forming apparatus main body 1 through the opening 24. The process cartridge 71 can be mounted in the image forming apparatus main body 1 by assembling the photoconductor 3 to the main body frame 13 and fixing the photoconductor 3 to the drive shaft 20 by the reverse operation. With the process cartridge 71 mounted in the image forming apparatus main body 1 as described above, the gear 32 is rotationally driven by the drive motor 35, and the rotation is transmitted to the photoconductor 3 through the drive shaft 20. Is driven to rotate.

  In the image forming apparatus shown in FIGS. 1 to 5, each of the photoconductors 3Y to 3BK is configured to be rotationally driven by a separate photoconductor drive motor 35, but all the photoconductors 3Y to 3BK are driven by a single photoconductor drive motor. You may comprise so that a photoreceptor may be driven. Alternatively, the photoreceptors 3Y, 3M, and 3C on which chromatic toner images are formed are driven by one photoreceptor driving motor, and the photoreceptor 3BK on which an achromatic toner image is formed are driven by another one photoreceptor driving motor. It can also be configured as follows. In addition, only one photoconductor is provided, and a monochrome toner image formed on the photoconductor is transferred to a recording medium carried on a transfer belt to form a recorded image. You can also. As described above, the image forming apparatus as an object of the present invention includes a photosensitive member on which a toner image is formed, a transfer belt wound around a plurality of rollers including a driving roller, and a photosensitive member drive that rotationally drives the photosensitive member. The image forming apparatus shown in FIGS. 1 to 5 includes a toner image formed on the photosensitive member, and a belt drive motor that rotates the drive roller to rotate the motor and the transfer belt. A recording image is obtained by transferring to a recording medium carried on a transfer belt and conveyed.

  In addition, the image forming apparatus shown in FIGS. 1 to 5 includes a drive shaft 20 that is rotationally driven by a photoconductor drive motor 35 and a claw member 37 provided on the drive shaft 20. The engaging shaft is detachably fitted to the drive shaft 20 and has an engaging portion that can be engaged with and disengaged from the claw member 37. By engaging the engaging portion with the claw member 37, the driving shaft 20 is rotated. Since the photosensitive member 3 is transmitted to the photosensitive member 3 and is driven to rotate by the photosensitive member driving motor 35 via the driving shaft 20, the photosensitive member 3 can be easily replaced.

  Further, a process cartridge 71 is formed in which the photosensitive member 3 and at least one process device for forming a toner image on the photosensitive member 3 are integrally assembled. The process cartridge 71 is configured as the image forming apparatus main body 1. Therefore, the process cartridge 71 can be exchanged easily.

  By the way, in the image forming apparatus described above, the rotational speed of the photosensitive member driving motor 35 and the rotational speed of the belt driving motor 65 are such that the surface linear velocities of the photosensitive member 3 and the transfer belt 4 are equal or both. The toner image on the photosensitive member 3 can be correctly transferred onto the recording medium P carried on the transfer belt 4 by setting so that a slight difference can be made in the speed. At this time, in the conventional image forming apparatus, when the temperature in the image forming apparatus main body increases, the diameter of the driving roller for the transfer belt increases, and the surface linear velocity of the transfer belt and the photosensitive member becomes the above-described predetermined speed. Therefore, the image quality of the toner image transferred to the recording medium may be deteriorated.

  Therefore, in the image forming apparatus of the present example, as shown in FIG. A control device (not shown) for controlling the rotational speed of at least one of the belt drive motor 65 is provided. According to this configuration, even when the temperature in the image forming apparatus main body 1 is greatly changed and the diameter of the driving roller 60 for the transfer belt 4 is changed, the surface linear velocity of the transfer belt 4 and the surface of the photoreceptor 3 are changed. Since the rotation speed of the photosensitive member drive motor 35, the belt drive motor 65, or both of the drive motors 35 and 65 is controlled so that the linear velocity can maintain the above-described relationship, the recording speed can be reduced. It is possible to effectively suppress the occurrence of density unevenness and color misregistration in the transferred toner image and to improve the image quality.

  FIG. 6 is a flowchart showing an example of such an operation. When there is a request to start the printing operation (S1), the temperature in the image forming apparatus main body is detected by the temperature sensor 67 (S2), and the detection signal is sent to the CPU constituting the control device. Here, from the detected temperature, the rotational speeds of the drive motors 35 and 65 are calculated so that the surface linear velocity of the transfer belt 4 and the photosensitive member 3 has a predetermined relationship (S3), and the rotational speed is set (S4). ). Under this condition, the printing operation is started (S5), whereby a high quality toner image is formed on the recording medium.

  The image forming apparatus shown in FIGS. 1 to 5 is configured to directly transfer a toner image formed on the photosensitive member 3 to a recording medium carried on the transfer belt 4 to form a recorded image. However, as shown in FIG. 7, the transfer belt 4 wound around the driving roller 60 and the other rollers 61 and 62 is arranged opposite to the photoreceptors 3Y, 3M, 3C, and 3BK, and each photosensitive member is arranged. The photoconductor drive motor (not shown) rotates the photoconductor counterclockwise, and the belt drive motor (not shown) drives the transfer belt 4 in the direction of arrow A to place it on each photoconductor 3Y to 3BK. An image forming apparatus of a type in which the formed yellow toner image, magenta toner image, cyan toner image, and black toner image are transferred onto the transfer belt 4 and transferred to the recording medium P is also described above. did The construction relied, it is possible to form a high quality toner image on the recording medium. In addition, a single photoconductor is provided, toner images of different colors are sequentially formed on the photoconductor, the respective toner images are transferred onto a transfer belt, and the superimposed toner image is transferred to a recording medium. The above-described configurations can be similarly applied to the image forming apparatus. These intermediate transfer type image forming apparatuses transfer a toner image formed on a photoreceptor to a transfer belt, and transfer the toner image transferred to the transfer belt to a recording medium to obtain a recorded image. This is different from the direct transfer type image forming apparatus illustrated in FIGS.

1 is a schematic diagram illustrating an example of an image forming apparatus. FIG. 2 is an enlarged cross-sectional view of the process cartridge shown in FIG. 1. It is sectional drawing which shows the other example of a process cartridge. FIG. 3 is a cross-sectional view of a support structure of a photoconductor and a transmission device that transmits rotation to the photoconductor. FIG. 4 is a cross-sectional view showing a state where a photoconductor is detached from a drive shaft. 5 is a flowchart illustrating an operation example related to temperature detection in the image forming apparatus main body by a temperature sensor. 1 is a schematic diagram illustrating an example of an intermediate transfer type image forming apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus main body 3Y, 3M, 3C, 3BK Photoconductor 4 Transfer belt 20 Drive shaft 35 Photoconductor drive motor 37 Claw member 60, 61, 62, 63 Roller 65 Belt drive motor 67 Temperature sensor 71 Process cartridge P Recording medium

Claims (4)

A photosensitive member on which a toner image is formed; a transfer belt wound around a plurality of rollers including a driving roller; a photosensitive member driving motor that rotationally drives the photosensitive member; and the driving roller for rotating the transfer belt. An image forming apparatus for obtaining a recorded image by transferring a toner image formed on the photoconductor to a recording medium carried by the transfer belt and transporting the toner image. A temperature sensor that detects a temperature in the apparatus main body, and a control device that controls the number of rotations of at least one of the photosensitive member driving motor and the belt driving motor based on a detection result of the temperature sensor. An image forming apparatus. A photosensitive member on which a toner image is formed; a transfer belt wound around a plurality of rollers including a driving roller; a photosensitive member driving motor that rotationally drives the photosensitive member; and the driving roller for rotating the transfer belt. A belt drive motor for rotating the toner image, transferring the toner image formed on the photosensitive member to the transfer belt, and transferring the toner image transferred to the transfer belt to a recording medium to obtain a recorded image. In the image forming apparatus, a temperature sensor that detects a temperature in the image forming apparatus main body, and a control device that controls the number of rotations of at least one of the photosensitive member driving motor and the belt driving motor based on a detection result of the temperature sensor. An image forming apparatus comprising: A driving shaft that is rotationally driven by the photosensitive member driving motor; and a claw member provided on the driving shaft. The photosensitive member is detachably fitted to the driving shaft and is engaged with the claw member. When the engagement portion and the claw member are engaged, the rotation of the drive shaft is transmitted to the photoconductor, and the photoconductor is driven by the photoconductor via the drive shaft. The image forming apparatus according to claim 1, wherein the image forming apparatus is rotationally driven by a motor. 3. A process cartridge comprising the photosensitive member according to claim 1 and at least one process device for forming a toner image on the photosensitive member.

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