JP2009115966A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus for forming an image on a recording medium, capable of achieving the speed increase while avoiding the noise increase and the torque shortage. <P>SOLUTION: A single first motor 720 for rotationally driving three photoreceptor drums 11Y, 11M and 11C except a K photoreceptor drum 11K among four photoreceptor drums 11Y, 11M, 11C and 11K is disposed for the three photoreceptor drums 11Y, 11M and 11C. A single second motor 730 other than the first motor 720, for rotationally driving three developing rolls 141Y, 141M and 141C except a K developing roller 141K among four developing rolls 141Y, 141M, 141c and 141K is disposed for the three developing rolls 141Y, 141M and 141C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus that forms an image on a recording medium.

  Conventionally, for example, four toner image forming units arranged in parallel corresponding to four color toners of yellow (Y), magenta (M), cyan (C), and black (K) are used as intermediate media. Each toner image forming unit forms a toner image of each color of YMCK in synchronization with the feeding of the intermediate transfer belt, and sequentially superimposes and transfers (primary transfer) each color toner image onto the intermediate transfer belt. 2. Description of the Related Art An intermediate transfer type full color tandem type image forming apparatus that transfers (secondary transfer) a color toner image superimposed on a transfer belt onto a recording sheet as a recording medium and fixes it is known.

  In each toner image forming unit of such a full-color tandem type image forming apparatus, an electrostatic latent image is formed on the peripheral surface while rotating, and an image represented by a photosensitive drum or the like that holds the electrostatic latent image. The electrostatic latent image held on the image holding body is developed by holding and rotating the holding body and the developer containing toner on the peripheral surface that is in contact with or close to the image holding body, and rotates on the image holding body. A developer for forming a toner image is provided. In addition, this full-color tandem type image forming apparatus is provided with a servo motor that rotationally drives the image holding member and the developing member.

Here, when designing a speed increaser capable of forming more images by accelerating the speed of the conventional image forming apparatus, generally, a method for increasing the rotation speed of the servo motor by changing the clock frequency of the servo motor. (For example, refer to Patent Document 1).
JP 2002-182701 A

  However, it is known that noise is generated when the rotational speed of the servo motor exceeds 2000 by greatly increasing the speed of the conventional image forming apparatus by the speed increase according to the method of Patent Document 1 described above. . In addition, increasing the speed increases the load, which may cause a shortage of torque.

  In view of the above circumstances, an object of the present invention is to provide an image forming apparatus capable of increasing the speed while avoiding an increase in noise and insufficient torque.

The image forming apparatus of the present invention that achieves the above object provides:
A plurality of image carriers that form an electrostatic latent image on the peripheral surface while rotating and hold the electrostatic latent image;
The electrostatic latent image held on the image holding body is developed by holding and rotating a developer containing toner of each color on each peripheral surface that is in contact with or close to each of the plurality of image holding bodies. A plurality of developing members;
An image carrier motor that rotates one of the plurality of image carriers, and that is provided for the plurality of image carriers;
One developer motor is provided for each of the plurality of developers, and the developer motor is different from the image carrier motor for rotating the plurality of developers.

  In the image forming apparatus of the present invention, one image carrier motor that rotationally drives the plurality of image carriers is provided for each of the plurality of image carriers, and the developer that rotationally drives the plurality of developers. One developing motor is provided for the plurality of developing members, and the developing member motor is a motor different from the image holding member motor. Therefore, according to the image forming apparatus of the present invention, it is caused by increasing the rotational speed by increasing the speed of a conventional image forming apparatus in which a plurality of image holding members and a plurality of developing members are rotationally driven by a single motor. It is possible to increase the speed while avoiding torque shortage and noise increase due to increased load. In addition, since the image forming apparatus of the present invention rotates and drives the plurality of image carriers and the plurality of developers by separate motors, the vibration on the developer side is suppressed from being transmitted to the image carrier side. High quality image formation is realized.

Here, the image forming apparatus of the present invention is
“Another image holding body different from the plurality of image holding bodies, in which an electrostatic latent image is formed on the peripheral surface while rotating and holds this electrostatic latent image,
The electrostatic latent image held on the separate image holding body by rotating and holding a developer containing toner of a color different from each color on the peripheral surface in contact with or close to the separate image holding body A developing member different from the plurality of developing members,
Another drive system for rotating the separate image carrier and the separate developer with a motor different from the image carrier motor and the developer motor ”
It is preferable.

  According to such a preferable embodiment, for example, in the image forming apparatus having the color mode and the monochrome mode, the separate image holding member and the separate developer are used by the separate drive system in the monochrome mode. Accordingly, the image carrier motor and the developer motor can be stopped in the monochrome mode, and wear of the plurality of image carriers can be prevented in the monochrome mode.

The image forming apparatus according to the present invention includes:
“At least one of the image carrier motor and the developer motor is a motor selected from a plurality of types of motors,
The image carrier motor and the developer motor are attached to support the image carrier motor and the developer motor. The image carrier motor and the developer motor are mounted separately from the mounting locations of the image carrier motor and developer motor. It has a motor support member that has an attachment point to which a motor of a different type from the motor for the image carrier and the motor for the developer among a plurality of types of motors is attached.
This is also a preferred form.

  According to such a preferable embodiment, the motor support member can be used as a common part of various image forming apparatuses, so that the mold cost can be suppressed, and the image forming apparatus having an optimum specification at a low cost. Can be provided. Furthermore, quality can be stabilized by using a common mold.

  Furthermore, in the image forming apparatus of the present invention including the motor support member, it is more preferable that the plurality of types of motors are motors having different reduction ratios.

  According to such a preferred embodiment, a high-speed image forming apparatus or a low-speed image forming apparatus can be selected by attaching a desired motor from a plurality of types of motors having different reduction ratios to the mounting position of the motor support member. Various image forming apparatuses such as an image forming apparatus can be obtained. In addition, noise can be further reduced by selecting a motor with a different reduction ratio and changing the reduction ratio to reduce the motor speed.

  According to the present invention, an image forming apparatus capable of increasing the speed while avoiding an increase in noise and insufficient torque is provided.

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

  FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention.

  An image forming apparatus 1 shown in FIG. 1 is an image forming apparatus that employs a full-color tandem system having a color mode and a monochrome mode. In the color mode, four toner image forming units arranged in parallel corresponding to toners of four colors of yellow (Y), magenta (M), cyan (C), and black (K) are used as intermediate media. Each toner image forming unit forms a toner image of each color of YMCK in synchronization with the feeding of the intermediate transfer belt, and sequentially superimposes and transfers (primary transfer) each color toner image onto the intermediate transfer belt. The color toner image superimposed on the transfer belt is transferred (secondary transfer) onto a recording sheet as a recording medium and fixed. In the monochrome mode, a toner image forming unit corresponding to K color among the four toner image forming units is used, and a K color toner image is formed by the toner image forming unit in synchronization with the feeding of the intermediate transfer belt. Then, the toner image of K color is transferred onto the intermediate transfer belt, and the toner image transferred onto the intermediate transfer belt is transferred and fixed onto a recording sheet as a recording medium.

  The image forming apparatus 1 shown in FIG. 1 includes four toner image forming units 10Y, 10M, 10C, and 10K, and four primary transfer rolls 20Y, 20M, 20C, and 20K. In addition, the image forming apparatus 1 includes a semiconductive intermediate that forms a circumferential surface that is stretched around a drive roll 31, a driven roll 32, a tension roll 33, and a backup roll 42 and circulates in a counterclockwise arrow B direction. A transfer belt 30, a batch transfer device 40 that performs secondary transfer, and a fixing device 50 that fixes an unfixed toner image on a sheet are also provided.

  The four toner image forming units 10Y, 10M, 10C, and 10K are arranged side by side in the circulating movement direction of the intermediate transfer belt 30, and each toner image forming unit 10Y, 10M, 10C, and 10K has a clockwise arrow. There are provided photosensitive drums 11Y, 11M, 11C, and 11K that form an electrostatic latent image on the peripheral surface while rotating in the A direction and hold the electrostatic latent image. Of the four photosensitive drums 11Y, 11M, 11C, and 11K, the photosensitive drum 11K for K color corresponds to an example of another image holding member according to the present invention, and excludes the photosensitive drum 11K. The other three photosensitive drums 11Y, 11M, and 11C correspond to an example of a plurality of image holding members according to the present invention. The peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K are in contact with the intermediate transfer belt 30. The primary transfer rolls 20Y, 20M, 20C, and 20K are disposed at respective locations facing the respective four photosensitive drums 11Y, 11M, 11C, and 11K surrounded by the intermediate transfer belt 30. A portion where the body drums 11Y, 11M, 11C, and 11K are in contact with the intermediate transfer belt 30 is a primary transfer position.

  Further, around the toner image forming units 10Y, 10M, 10C, and 10K, non-contact charging devices 12Y, 12M, 12C, and 12K, exposure light irradiation devices 13Y, 13M, 13C, and 13K, and developing devices 14Y, 14M, 14C, 14K, auxiliary charging devices 15Y, 15M, 15C, 15K, auxiliary exposure devices 16Y, 16M, 16C, 16K, and drum cleaning devices 17Y, 17M, 17C, 17K.

  The developing devices 14Y, 14M, 14C, and 14K are provided around the photosensitive drums 11Y, 11M, 11C, and 11K, and upstream of the rotation of the photosensitive drums 11Y, 11M, 11C, and 11K with respect to the primary transfer position. Has been deployed. The exposure light irradiation devices 13Y, 13M, 13C, and 13K are disposed further upstream than the developing devices 14Y, 14M, 14C, and 14K, and the non-contact charging devices 12Y, 12M, 12C, and 12K are exposed. It is arranged further upstream than the light irradiation devices 13Y, 13M, 13C, 13K.

  The auxiliary charging devices 15Y, 15M, 15C, and 15K are arranged around the photosensitive drums 11Y, 11M, 11C, and 11K, and are downstream in the rotation of the photosensitive drums 11Y, 11M, 11C, and 11K with respect to the primary transfer position. Has been deployed. The auxiliary exposure devices 16Y, 16M, 16C, and 16K are disposed further downstream than the auxiliary charging devices 15Y, 15M, 15C, and 15K. The drum cleaning devices 17Y, 17M, 17C, and 17K are disposed further downstream than the auxiliary exposure devices 16Y, 16M, 16C, and 16K. The drum cleaning devices 17Y, 17M, 17C, and 17K are not transferred to the intermediate transfer belt 30 at the primary transfer position. Residual toner remaining on the drums 11Y, 11M, 11C, and 11K is cleaned with the conductive cleaning brushes 171Y, 171M, 171C, and 171K.

  Hereinafter, image formation when the image forming apparatus 1 shown in FIG. 1 is operated in the color mode will be described.

  The peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K are uniformly negatively charged by the non-contact charging devices 12Y, 12M, 12C, and 12K. On the peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K that are uniformly negatively charged by the non-contact type charging devices 12Y, 12M, 12C, and 12K, images are applied from the exposure light irradiation devices 13Y, 13M, 13C, and 13K. The laser beam holding the information is irradiated to form electrostatic latent images on the peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K. The developing devices 14Y, 14M, 14C, and 14K employ a two-component developing method. The developing devices 14Y, 14M, 14C, and 14K include two-component development including a magnetic carrier and negatively charged toner. The agent is contained. Further, developing rollers 141Y, 141M, 141C, and 141K are provided in the developing devices 14Y, 14M, 14C, and 14K. Of these four developing rolls 141Y, 141M, 141C, 141K, the developing roll 141K for K color corresponds to an example of another developing body according to the present invention, and the other three developing rolls except for the developing roll 141K. The developing rolls 141Y, 141M, and 141C correspond to an example of a plurality of developing members referred to in the present invention. On the peripheral surfaces of the developing rolls 141Y, 141M, 141C, and 141K, a developer layer (so-called magnetic layer) in which a magnetic carrier to which the toner is attached is formed is formed, and the negatively charged toner is stored in the developing roll 141Y, By rotating 141M, 141C, and 141K, the developer layers supply the photosensitive drums 11Y, 11M, 11C, and 11K with the electrostatic latent images. The electrostatic latent images formed on the peripheral surfaces of the photoconductor drums 11Y, 11M, 11C, and 11K are developed by being supplied with negatively charged toner and become toner images.

  The primary transfer rolls 20Y, 20M, 20C, and 20K are applied with a positive transfer bias having a polarity opposite to the polarity of the toner, and are formed on the peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K. The toner images are transferred from the peripheral surfaces of the photoconductive drums 11Y, 11M, 11C, and 11K to the peripheral surface of the intermediate transfer belt 30. The toner images formed by the toner image forming units 10 </ b> Y, 10 </ b> M, 10 </ b> C, and 10 </ b> K become color toner images that overlap one on the intermediate transfer belt 30.

  The batch transfer device 40 is provided on the toner image holding surface side of the intermediate transfer belt 30 and in contact with the secondary transfer roll 41 provided with pressure, and on the back side of the intermediate transfer belt 30. A backup roll 42 is provided, and the intermediate transfer belt 30 is sandwiched between these two rolls 41 and 42. Between these two rolls 41 and 42 is a secondary transfer position.

  Further, the image forming apparatus 1 shown in FIG. 1 is provided with a registration roll 62 that feeds the paper P conveyed from a paper tray (not shown) to the secondary transfer position via the chute 61. It is sent to the secondary transfer position at the timing. At the secondary transfer position, the overlapping color toner images on the intermediate transfer belt 30 are transferred onto the fed paper P.

  Further, the image forming apparatus 1 is provided with a conveyance belt 63 that conveys the sheet P on which the color toner image is secondarily transferred, and the sheet P conveyed by the conveyance belt 63 is sent to the fixing device 50. . The fixing device 50 includes a fixing roll 51 having a heating mechanism 511 and a pressure roll 52 provided so as to face the fixing roll 51. When the paper P that has passed the secondary transfer position is conveyed between the fixing roll 51 and the pressure roll 52 facing each other, the toner constituting the color toner image on the paper P is heated by the heating mechanism of the fixing roll 51. It is melted by 511 and fixed on the paper P, and an image composed of a fixed toner image is formed on the paper P.

  The photosensitive drums 11Y, 11M, 11C, and 11K after the toner images formed on the peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K are transferred to the peripheral surface of the intermediate transfer belt 30 at the primary transfer position are as follows. The transfer history is relaxed by the auxiliary charging devices 15Y, 15M, 15C, and 15K, and the photosensitive member potential is adjusted by the auxiliary exposure devices 16Y, 16M, 16C, and 16K. Further, after the toner images formed on the peripheral surfaces of the photoconductive drums 11Y, 11M, 11C, and 11K move to the peripheral surface of the intermediate transfer belt 30 at the primary transfer position, the photoconductor drums 11Y, 11M, 11C, and 11K The residual toner remaining in the toner is charged positively by the auxiliary charging devices 15Y, 15M, 15C, and 15K, and then electrically conductive cleaning brushes 171Y, 171M, 171C, and the like disposed in the drum cleaning devices 17Y, 17M, 17C, and 17K. 171K is electrostatically cleaned by receiving a negative voltage application.

  Next, a drive source for rotating the photosensitive drums 11Y, 11M, 11C, and 11K provided in the image forming apparatus 1 shown in FIG. 1, developing rolls 141Y, 141M, 141C, and 141K, and a drive for rotating them. The source will be described in detail.

  2 is an external perspective view of a motor support member 700 to which an intermediate transfer belt motor 710, a first motor 720, a second motor 730, and a third motor 740 are attached. FIG. 3 is a motor shown in FIG. It is the external appearance perspective view which looked at the supporting member 700 from the back surface side.

  The intermediate transfer belt motor 710 attached to the motor support member 700 shown in FIG. 2 has an intermediate transfer belt motor output shaft 711 as shown in FIG. The intermediate transfer belt motor output shaft 711 includes a gear 711a provided around the shaft, and the gear 711a is a shaft of a drive roll rotating shaft 311 on which the drive roll 31 (see FIG. 1) is mounted. It is connected to a gear 311a provided around. The driving force of the intermediate transfer belt motor 710 is transmitted to the drive roll 31 (see FIG. 1) via the intermediate transfer belt motor output shaft 711 and the drive roll rotating shaft 311, so that the intermediate transfer belt 30 is moved to an arrow. Circulately moves in the B direction (see FIG. 1).

  Moreover, the 1st motor 720 attached to the motor support member 700 shown in FIG. 2 has the 1st motor output shaft 721 as shown in FIG. The first motor output shaft 721 has a gear 721a provided around the shaft, and the gear 721a is a C-color photosensitive drum on which the C-color photosensitive drum 11C (see FIG. 1) is mounted. A gear 111Ca provided around the rotation shaft 111C for rotation and a gear 111Ma provided around the rotation shaft 111M for the M-color photosensitive drum on which the M-color photosensitive drum 11M (see FIG. 1) is mounted. In addition, a Y-color photosensitive drum 11Y (see FIG. 1) is attached to a gear 111Ma provided around the rotation shaft 111M for the M-color photosensitive drum via a gear 112. It is coupled to a gear 111Ya provided around the rotation shaft 111Y for the Y color photosensitive drum. The driving force of the first motor 720 is C through the first motor output shaft 721, the C-color photosensitive drum rotating shaft 111C, the M-color photosensitive drum rotating shaft 111M, and the Y-color photosensitive drum rotating shaft 111Y. These are transmitted to the photosensitive drum 11C for color (see FIG. 1), the photosensitive drum 11M for M color (see FIG. 1), and the photosensitive drum 11Y for Y color (see FIG. 1). Rotate in the direction (see FIG. 1). The first motor 720 corresponds to an example of an image carrier motor according to the present invention.

  Moreover, the 2nd motor 730 attached to the motor support member 700 shown in FIG. 2 has the 2nd motor output shaft 731 as shown in FIG. The second motor output shaft 731 has a gear 731a provided around the shaft, and this gear 731a is mounted with a C-color developing roll 141C (see FIG. 1) via the gear 1412. A gear 1411Ca provided around the rotation shaft 1411C for the C color developing roll and a rotation shaft 1411M for the M developing roller 141M (see FIG. 1) on which the M color developing roll 141M (see FIG. 1) is mounted. The gear 1411Ma is connected to the gear 1411Ma, and the gear 1411Ma provided around the rotation shaft 1411M for the M color developing roll is mounted with the Y developing roller 141Y (see FIG. 1) via the gear 1413. It is connected to a gear 1411Ya provided around the rotation shaft 1411Y for the Y color developing roll. The driving force of the second motor 730 is for the C color via the second motor output shaft 731, the C color developing roll rotating shaft 1411C, the M color developing roll rotating shaft 1411M, and the Y color developing roll rotating shaft 1411Y. These are rotated by being transmitted to the developing roll 141C (see FIG. 1), the M-color developing roll 141M (see FIG. 1), and the Y-color developing roll 141Y (see FIG. 1). The second motor 730 corresponds to an example of a developer motor according to the present invention.

  Moreover, the 3rd motor 740 attached to the motor support member 700 shown in FIG. 2 has the 3rd motor output shaft 741 as shown in FIG. The third motor output shaft 741 has a gear 741a provided around the shaft, and this gear 741a is a K-color photosensitive drum on which a K-color photosensitive drum 11K (see FIG. 1) is mounted. A developing roller for K color is connected to a gear 111Ka provided around the rotary shaft 111K for the use, and a gear 741a provided around the third motor output shaft 741 is connected via a gear 1414. 141K (see FIG. 1) is connected to a gear 1411Ka provided around the rotary shaft 1411K for the K-color developing roll. The combination of the third motor 740 and the gear 1414 corresponds to an example of another drive system according to the present invention.

  As described above, the image forming apparatus 1 according to the first embodiment includes the three other photosensitive drums 11Y, 11Y, 11M, 11C, and 11K except for the K-color photosensitive drum 11K. One first motor 720 for rotating the 11M and 11C is provided for the three photosensitive drums 11Y, 11M, and 11C, and for the K color of the four developing rolls 141Y, 141M, 141C, and 141K. A second motor 730 different from the first motor 720 that rotates and drives the other three developing rolls 141Y, 141M, and 141C excluding the developing roll 141K is provided for the three developing rolls 141Y, 141M, and 141C. Has been deployed. Therefore, according to the image forming apparatus 1 of the first embodiment, for example, the three photosensitive drums 11Y, 11M, and 11C and the three developing rolls 141Y, 141M, and 141C are rotationally driven by one motor. It is possible to increase the speed while avoiding torque shortage and noise increase due to an increase in the load caused by increasing the rotation speed by increasing the speed of the conventional image forming apparatus. Further, as described above, the image forming apparatus 1 according to the first embodiment rotates and drives the three photosensitive drums 11Y, 11M, and 11C and the three developing rolls 141Y, 141M, and 141C, respectively, by different motors. Therefore, vibrations on the developing rolls 141Y, 141M, and 141C are suppressed from being transmitted to the photosensitive drums 11Y, 11M, and 11C, and higher-quality image formation is realized.

  Further, according to the image forming apparatus 1 of the first embodiment, when the image forming apparatus 1 is operated in the monochrome mode, the first motor 720 and the second motor 730 are stopped to thereby stop the three photosensitive drums 11Y. , 11M, 11C can be prevented.

  Above, description of 1st Embodiment of this invention is complete | finished and 2nd Embodiment of this invention is described.

  In the second embodiment described below, the first motor 720 of the first embodiment described above is replaced with a fourth motor 750 having a reduction ratio different from that of the first motor 720.

  Hereinafter, the same elements as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences from the first embodiment will be described.

  4 is an external perspective view of a motor support member 700 to which an intermediate transfer belt motor 710, a fourth motor 750, a second motor 730, and a third motor 740 are attached. FIG. 5 is a motor shown in FIG. It is the external appearance perspective view which looked at the supporting member 700 from the back surface side.

  The motor support member 700 shown in FIG. 4 is the same as the motor support member 700 of the first embodiment described above, and is a position different from the mounting location where the first motor 720 of the first embodiment described above is mounted. In addition, the first motor 720 has a mounting location where a fourth motor 750 having a reduction ratio different from that of the first motor 720 is mounted. In the second embodiment, when the fourth motor 750 drives the fourth motor 750 at the same rotational speed as the first motor 720 of the first embodiment, the driven object can be driven to rotate at a higher speed. An example of what can be done will be described.

  As described above, by using the motor support member 700 as a common component, it is possible to reduce the mold cost, and it is possible to provide an image forming apparatus having an optimum specification at a low cost. Furthermore, quality can be stabilized by using a common mold.

  The fourth motor 750 attached to the motor support member 700 shown in FIG. 4 has a fourth motor output shaft 751 as shown in FIG. The fourth motor output shaft 751 has a gear 751a provided around the shaft, and this gear 751a is a C-color photosensitive drum on which a C-color photosensitive drum 11C (see FIG. 1) is mounted. A gear 111Ca provided around the rotation shaft 111C for rotation and a gear 111Ma provided around the rotation shaft 111M for the M-color photosensitive drum on which the M-color photosensitive drum 11M (see FIG. 1) is mounted. In addition, a Y-color photosensitive drum 11Y (see FIG. 1) is attached to a gear 111Ma provided around the rotation shaft 111M for the M-color photosensitive drum via a gear 112. It is coupled to a gear 111Ya provided around the rotation shaft 111Y for the Y color photosensitive drum. The driving force of the fourth motor 750 is controlled via the fourth motor output shaft 751, the C-color photosensitive drum rotating shaft 111C, the M-color photosensitive drum rotating shaft 111M, and the Y-color photosensitive drum rotating shaft 111Y. These are transmitted to the photosensitive drum 11C for color (see FIG. 1), the photosensitive drum 11M for M color (see FIG. 1), and the photosensitive drum 11Y for Y color (see FIG. 1). Rotate in the direction (see FIG. 1). The fourth motor 750 corresponds to an example of an image carrier motor according to the present invention.

  As described above, the motor support member 700 is attached at a position different from the position where the first motor 720 according to the first embodiment is attached, and the first reduction ratio is different from that of the first motor 720. By attaching the 4-motor 750, a high-speed image forming apparatus can be obtained. In addition, as described above, the fourth motor 750 can rotate the driven object at a higher speed when driven at the same rotational speed as the first motor 720 of the first embodiment. By attaching the fourth motor 750, both speed increase and low noise can be achieved.

1 is a schematic configuration diagram of a first embodiment of the present invention. FIG. 3 is an external perspective view of a motor support member to which an intermediate transfer belt motor, a first motor, a second motor, and a third motor are attached. It is the external appearance perspective view which looked at the motor support member shown in FIG. 2 from the back surface side. FIG. 6 is an external perspective view of a motor support member to which an intermediate transfer belt motor, a fourth motor, a second motor, and a third motor are attached. It is the external appearance perspective view which looked at the motor support member shown in FIG. 4 from the back surface side.

Explanation of symbols

1 Image forming apparatus 10Y, 10M, 10C, 10K Toner image forming unit 11Y, 11M, 11C, 11K Photosensitive drum 12Y, 12M, 12C, 12K Non-contact charging device 13Y, 13M, 13C, 13K Exposure light irradiation device 14Y, 14M, 14C, 14K Developing device 141Y, 141M, 141C, 141K Developing roll 15Y, 15M, 15C, 15K Auxiliary charging device 16Y, 16M, 16C, 16K Auxiliary exposure device 17Y, 17M, 17C, 17K Drum cleaning device 171Y, 171M, 171C, 171K Conductive cleaning brushes 20Y, 20M, 20C, 20K Primary transfer roll 30 Intermediate transfer belt 31 Drive roll 32 Driven roll 33 Tension roll 40 Batch transfer device 41 Secondary transfer roll 42 Backup roll 50 Roll fixing device 51 Fixing roll 511 Heating mechanism 52 Pressure roll 61 Chute 62 Registration roll 63 Conveying belt 700 Motor support member 710 Intermediate transfer belt motor 711 Intermediate transfer belt motor output shaft 711a Gear 311 Drive roll rotating shaft 311a Gear 720 First motor 721 First motor output shaft 721a Gear 111C Rotating shaft for C color photosensitive drum 111Ca Gear 111M Rotating shaft for M photosensitive drum 111Ma Gear 112 Gear 111Y Rotating shaft for Y photosensitive drum 111Ya Gear 730 First Two motors 731 Second motor output shaft 731a Gear 1412 Gear 1411C Rotating shaft for C color developing roll 1411Ca Gear 1411M Rotating shaft for M developing roller 1411Ma Gear 1413 Gear 1411Y Y Rotating shaft for developing roller 1411Ya Gear 740 Third motor 741 Third motor output shaft 741a Gear 111K Rotating shaft for K photosensitive drum 111Ka Gear 1414 Gear 1411K Rotating shaft for K developing roller 1411Ka Gear 750 Fourth motor 751 Fourth motor Output shaft 751a Gear

Claims (4)

A plurality of image holders that hold the electrostatic latent image by forming an electrostatic latent image on the peripheral surface while rotating;
The electrostatic latent image held on the image carrier is developed by holding and rotating a developer containing toner of each color on each peripheral surface that is in contact with or close to each of the plurality of image carriers. A plurality of developing members;
An image carrier motor that rotates one of the plurality of image carriers, which is provided for the plurality of image carriers;
An image forming apparatus comprising: a developer motor that is different from the image carrier motor and rotationally drives the plurality of developers. . A separate image holding body different from the plurality of image holding bodies, in which an electrostatic latent image is formed on the peripheral surface while rotating and holds the electrostatic latent image;
An electrostatic latent image held on the separate image holding member by rotating while holding a developer containing toner of a color different from each color on the peripheral surface in contact with or close to the separate image holding member Developing a different developer from the plurality of developers,
2. A separate drive system for rotating the separate image carrier and the separate developer with a motor different from the image carrier motor and the developer motor. Image forming apparatus. At least one of the image carrier motor and the developer motor is a motor selected from a plurality of types of motors;
The image carrier motor and the developer motor are attached to support the image carrier motor and the developer motor. The image carrier motor and the developer motor are mounted separately from the mounting locations of the image carrier motor and developer motor. 3. The image according to claim 1, further comprising a motor support member having a mounting portion to which a motor of a different type from the motor for the image carrier and the motor for the developer among the plurality of types of motors is mounted. Forming equipment.   The image forming apparatus according to claim 3, wherein the plurality of types of motors are motors having different reduction ratios.

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