JPH09211921A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device provided with a driving mechanism capable of attaining sure actuation of a planetary gear mechanism by making torque (rotational torque) for rotating supporting members around the rotary shafts of sun gears larger than torque (sliding torque) around the rotary shaft caused when a regulating member is slid on the outer peripheries of the supporting members. SOLUTION: The sun gear G55 is engaged with a planetary gear G56 and rotated by a shaft provided in the supporting member 72. The sun gear G57 is engaged with a planetary gear G58 and rotated by a shaft provided in the supporting member 71. Then, the top end part 731 of the regulating member 73 works on the supporting member 71 and the top end part 732 works on the supporting member 72. Further, a spring 734 is provided on the regulating member 73. When the torque for rotating the supporting members 71 and 72 around the rotary shaft of the sun gears G55 and G57 is defined as the rotational torque and the torque around the rotary shaft caused at the time of sliding the regulating member 73 on the outer peripheries of the supporting members 71 and 72 is defined as the sliding torque, the rotational torque is set to be larger than the sliding torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus having a planetary gear mechanism.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus, a drive mechanism is used to rotate a driven gear, a common power source is used as the drive mechanism, and a planetary gear mechanism is used as a power transmission system. There is known an image forming apparatus having a structure in which a specified mechanism is individually operated by switching the specified mechanism. For example, each of a plurality of developing devices contains a developer of a specific color and is driven individually in accordance with the timing of developing each toner image. 2. Description of the Related Art There is known an image forming apparatus having a structure that is used as a common power source and individually operates a developing device specified by switching a transmission system of the power. Further, a toner replenishing device is provided for each of the plurality of developing devices, but a structure in which a drive motor is used as a common power source and toner is replenished to the specified developing device by switching the power transmission system. An image forming apparatus having the above is also known.

A sun gear driven by a drive source as the planetary gear mechanism, a planetary gear driven by the sun gear and capable of revolving around the rotation axis of the sun gear, and the planetary gear by the revolution of the planetary gear. A known one is provided with a driven gear that meshes with each other, a support member that supports the planetary gear and that is coaxial with the rotation axis of the sun gear, and a regulating member that regulates the movement of the supporting member and disconnects the power transmission system. Has been.

It is also known that the planetary gear mechanism is provided with a restricting means for restricting the revolution of the planetary gear by a restricting member for restricting the movement by locking the groove of the supporting member.

Further, in some cases, the center of gravity of the supporting member unit having a planetary gear and coaxial with the rotation axis of the sun gear is not provided near the rotation axis of the sun gear.

[0006]

However, from the rotation torque around the rotation axis of the sun gear of the support member,
If the sliding friction torque around the rotation axis of the support member caused by the sliding of the support member by the regulating member is larger, the planetary gear does not revolve around the sun gear and the planetary gear mechanism does not operate. If the release torque around the rotation axis of the support member that causes the restriction member to escape from the groove of the support member is larger than the rotation torque around the rotation axis of the sun gear shaft of the support member, the support member causes the support member to move. There is a problem that the planetary gear mechanism does not operate without being released from
Further, there is a problem that the rotation of the support member tends to be unstable due to the attitude difference of the support member unit.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an image forming apparatus having a drive mechanism in which the revolution of the planetary gears of the planetary gear mechanism is ensured. It is an object of the present invention to provide an image forming apparatus in which the movement of the supporting member of the drive mechanism is reliable, and further to provide an image forming apparatus in which the drive mechanism is not affected by the attitude difference.

[0008]

The above object is achieved by the following constitution.

(1) A drive source, a sun gear driven by the drive source, a planetary gear that is driven by the sun gear and can revolve around the rotation axis of the sun gear, and A driven gear in an image forming apparatus that is meshed with a planetary gear and driven by the rotation of the planetary gear, a support member that supports the planetary gear and has the same axis as the rotation axis of the sun gear, and restricts rotation of the support member. And a regulation means having a regulation member, wherein the support member has a rotational torque that rotates around the rotation axis of the sun gear,
When the torque around the rotation shaft generated when the regulating member slides on the outer periphery of the support member is referred to as a sliding torque, the rotation torque is larger than the sliding torque. And (2) a drive source, a sun gear driven by the drive source, a planetary gear driven by the sun gear and capable of revolving around the rotation axis of the sun gear, and the revolution of the planetary gear. The driven gear in the image forming apparatus that is meshed with the planetary gear and driven by the rotation of the planetary gear, the support member that supports the planetary gear and is coaxial with the rotation axis of the sun gear, and the groove provided in the support member. A stop means for stopping the rotation of the support member, and a torque for rotating the support member around the rotation shaft is a rotation torque, and is generated when the restriction member escapes from the groove of the support member. Before When the torque around the axis of rotation and the release torque, an image forming apparatus, characterized in that towards the rotation torque is greater than the release torque,
(3) A drive source, a sun gear driven by the drive source, a planetary gear that is driven by the sun gear and can revolve around the rotation axis of the sun gear, and the planetary gear is revolved by the revolution of the planetary gear. The driven gear that is driven by the rotation of the meshing planetary gear and the supporting member unit that has the planetary gear and is coaxial with the rotation shaft of the sun gear, and the supporting member unit has a center of gravity near the rotation shaft of the sun gear. An image forming apparatus characterized by the above.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of the embodiments of the present invention, the overall structure of an image forming apparatus suitable for application of the image forming apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of an image forming apparatus suitable for application of the image forming apparatus of the present invention. An image carrier 10 is a photosensitive drum, for example, an OPC photosensitive body is applied on the drum and is grounded. It is driven and rotated clockwise. Charger 12
Is a scorotron charger, which negatively and uniformly charges the peripheral surface of the image carrier 10 by a corona discharge by a grid held at a predetermined potential and a corona discharge wire to give a potential of V _H. Prior to the charging by the charger 12, exposure is performed by the PCL 11 using a light emitting diode or the like in order to remove the history of the photosensitive member up to the previous printing to remove the charge on the peripheral surface of the photosensitive member.

After the image carrier 10 is uniformly charged, the laser writing device 13 performs image exposure based on the image signal. In this image exposure, an image signal input from a computer or an image reading device is processed by an image signal processing section, and then input to a laser writing device 13 to input the image carrier 1.
A latent image is formed on the image surface.

The laser writing device 13 has a rotary polygon mirror 131 which rotates using a laser diode (not shown) as a light emitting source.
A plurality of reflecting mirrors M1, M2, M through the fθ lens 132 and the like.
The optical path is bent by 3 for main scanning, and sub-scanning is performed by rotation of the image carrier 10 to form a latent image.

Around the periphery of the image bearing member 10, a developer is formed of a magnetic carrier and a negatively charged conductive toner such as yellow (Y), magenta (M), cyan (C), and black (K). A built-in developing device 20 is provided, and first, the development of the first color is carried out by a developing sleeve 21 which is a developer carrying member which contains a magnet body and holds and rotates the developer. The developer is regulated and held on the developing sleeve 21 by the regulation blade which is a layer thickness regulating member so as to have a layer thickness of 0.05 to 0.5 mm, and is conveyed to the developing area.

After the visualization of the first color is completed, the image forming process for the second color is started, and the image carrier 10 by the charger 12 is again used.
The peripheral surface is uniformly charged, and a latent image based on the image data of the second color is formed by the laser writing device 13. At this time, the charge removal by the PCL 11 performed in the image forming step for the first color is not performed because the toner attached to the image portion for the first color scatters due to the sudden decrease in the potential around the image.

Again over the entire peripheral surface of the image carrier 10, V
A latent image similar to that of the first color is formed on the portion of the photoconductor having the _H potential and the image of the first color is developed, but the image is exposed again to the portion of the image having the first color. In the developing portion, the latent image of the potential V _T , which is slightly higher in absolute value than V _L, is formed by the light shielding by the toner attached to the first color and the electric charge of the toner itself, and the latent image is generated depending on the potential difference between V _DC and V _T. Development is performed.

An image forming process similar to that for the second color is performed for the third and fourth colors, and toner images of four colors are formed on the peripheral surface of the image carrier 10. The image carrier 10 holding the toner image in this manner is transferred in the next transfer step.

On the other hand, the transfer paper P is fed from the paper feed cassette 40 by a pair of paper feed rollers 41 and 42.
The transfer paper P is fed by a pair of timing rollers 43 in synchronization with the toner image on the image carrier 10. The power of a drive motor (not shown) drives the paper feed roller 41, the paper feed roller 42, and the timing roller 43 via the planetary gear mechanism.

The transfer paper P is transferred by a transfer belt device 30 in which a transfer belt 31 made of an endless rubber belt having a resistance of 10 ⁸ to 10 ¹⁴ Ω · cm and a thickness of 0.4 to 1.0 mm is stretched. The paper is pressed against the photoconductor drum and is fed to a transfer area, which is an area to which a transfer electric field for transferring the toner image on the photoconductor drum onto the transfer paper is applied, and the peripheral surface of the image carrier 10 is conveyed. The above multicolor toner images are collectively transferred onto the transfer paper P. The transfer belt is an endless rubber belt having a width larger than that of the transfer paper.
Transfer paper is electrostatically adsorbed and loaded, carried in and out of the transfer area, and in the transfer area, the transfer paper is pressed against the photosensitive drum with a prescribed pressure and the toner image on the photosensitive drum is transferred onto the transfer paper. It is a member that functions as a medium that gives a transfer electric field for transferring to.

A high DC voltage is applied to the shaft 32a of the holding roller 32 upstream of the holding rollers 32 and 33 for stretching the transfer belt 31 with respect to the direction in which the transfer paper P enters. A conductive brush 34 is installed in a grounded state at a position in contact with 32a via the transfer belt 31 as a charging unit for the transfer paper P.

The transferred transfer paper P enters between the brush 34 and the transfer belt 31, and electric charges are injected into the transfer paper P from the brush 34, and the transfer paper P is attracted between the transfer paper P and the transfer belt 31. Power is generated. After that, the transfer paper P is the image carrier 10.
Nip portion (transfer area) 3 formed by the transfer belt 31 and
5, a transfer electric field is applied from the back surface of the transfer belt 31 by the discharge device 36 or a bias roller instead of the discharge device 36, and the multicolor toner image is transferred and transferred onto the transfer paper P.

The transfer paper P holding the transferred multicolor toner image is held by the holding roller 3 on the downstream side on which the transfer belt 31 is stretched.
The shaft 33a of No. 3 is used as a counter electrode, and is separated from the transfer belt 31 after being subjected to static electricity removal by AC corona discharge or while receiving AC corona discharge. A cleaning blade 37 removes the toner attached to the rotating transfer belt 31. The transfer belt 31 of the transfer belt device 30 is rotated clockwise around the shaft 33a of the holding roller 33 on the downstream side during the formation of the multicolor toner image and is separated from the image carrier 10. The holding roller 33 is driven by the power of a drive motor (not shown) via the planetary gear mechanism.

The transfer paper P, which holds the multicolor toner image separated from the transfer belt device 30, is composed of at least two fixing upper rollers and a fixing lower roller each having a heater at a close position inside or outside one of the rollers. The toner is conveyed to the fixing device 50, and heat and pressure are applied between the upper fixing roller and the lower fixing roller to melt the adhered toner, and the toner is fixed on the transfer paper P and fixed.

The fixed transfer paper P is a pair of discharge rollers 5
6, the sheet is discharged to the tray portion 59 driven by the discharging roller 57 and the discharging roller 58. The discharge roller 5 is driven by the power of a drive motor (not shown) via the planetary gear mechanism.
6, 57, 58 are being driven.

After the transfer, the residual toner remaining on the peripheral surface of the image carrier 10 is discharged by the static eliminator 15, and then reaches the cleaning device 16 and is cleaned by the cleaning blade 16a which is in contact with the image carrier 10. It is scraped inside and stored. The image carrier 10 from which the residual toner has been removed by the cleaning device 16 is the PCL 11
After being exposed to light by, the charging device 12 receives uniform charge, and the next image forming cycle starts. During the formation of the multicolor toner image, the cleaning blade 16a is separated from the surface of the photoconductor, and the charge removal by the charge remover 15 is disabled.

(First Embodiment) An image forming apparatus according to the first embodiment will be described with reference to the drawings. 2 is a diagram of a common drive motor of each developing device and its transmission gear train mechanism, FIG. 3 is a diagram of a driving mechanism having a planetary gear mechanism of each developing device, and FIG. 5 is a torque explanatory diagram when the regulation member slides on the outer periphery of the support member, and FIG. 6 is a state diagram in which the regulation member is locked in the groove of the support member. The same members as those in FIG. 1 are denoted by the same reference numerals, and descriptions of those members that do not change mechanically or functionally are omitted.

First, referring to FIG. 2, the mechanism of the common drive motor of the developing device and its transmission gear train will be described. The common drive motor 79 rotates forward and reverse, and the common drive motor 79 is provided with a gear G51. The gear G51 is fitted with the gear G52. Further, the gear G52 and the gear G53 are integrated, and the gear G53 is fitted with the gear G54,
Further, the gear G54 is the sun gear G55 and the sun gear G5.
It is fitted to two gears of No. 7. The sun gear G55 is fitted with the planetary gear G56, and is rotated by a shaft provided on the support member 72. On the other hand, the sun gear G57 is fitted with the planetary gear G58, and is rotated by a shaft provided on the support member 71. The casing 75, the solenoid 74, the regulating member 73, etc. will be described later with reference to FIG.

Next, referring to FIG. 3, a drive mechanism diagram having the planetary gear mechanism of each developing device will be described. The planetary gear G56
Is adapted to engage with the gear G11 when the support member 72 revolves clockwise. The gear G11 is a gear G1.
2 and the gear G12 is connected to the developing sleeve 21.
It is fitted with a gear G13 integrated with Y. Gear G1
3 rotates the developing sleeve 21Y.

The planetary gear G56 is adapted to fit with the gear G21 when the support member 72 revolves counterclockwise, the gear G21 is fitted with the gear G22, and the gear G22 is fitted with the gear G23. Further, the gear G23 is fitted with a gear G24 which is integral with the developing sleeve 21M (see FIG. 1). The gear G24 is the developing sleeve 2
Rotating 1M.

On the other hand, the planetary gear G58 is adapted to fit with the gear G31 when the support member 71 revolves clockwise. The gear G31 is fitted with a gear G32, and the gear G32 is fitted with a gear G33 which is integrated with the developing sleeve 21C of FIG. The gear G33 rotates the developing sleeve 21C.

The planetary gear G58 is adapted to fit with the gear G41 when the support member 71 revolves counterclockwise. The gear G41 is integrated with the gear G42, and the gear G42 is fitted with the gear G43. Further, the gear G43 is fitted with the gear G44, and the gear G44 is fitted with the gear G45 integrated with the developing sleeve 21K.
The gear G45 rotates the developing sleeve 21K.

Next, the structure of the regulating member will be described. The tip portions 731 and 732 of the regulating member 73 are provided. The tip portion 731 acts on the support member 71 and the tip portion 7
32 acts on the support member 72. In addition, the regulation member 7
3 is provided with a spring 734. Further, the casing 75 has a restricting member 73 rotatable, and further has a solenoid 74 fixed thereto.

Further, a state where the tip portion 731 of the regulating member 73 escapes from the groove 711 of the supporting member 71 will be described with reference to FIG. This state is in the middle of transition from magenta M development to cyan C development. The magnet is off. The regulating member 73 is rotatably supported by a shaft 733, and the tip portions 731 and 732 are synthetic resin materials provided at the tip of the regulating member 73 and having good slidability. Further, the regulating member 73 is biased by a spring 734 in the counterclockwise direction in the drawing. The casing 75 holds the solenoid 74 and is provided with a shaft 733. Furthermore, the point of action P1
Is a position where the tip portion 731 contacts the groove cam 713, and the force F
1 is the force that the grooved cam 713 receives from the tip portion 731 when the tip portion 731 starts sliding, and the dimension L1 is the length of the perpendicular line lowered from the center line N1 in the force F1 direction. Support member 7
The revolution torque of 1 is larger than the F1 × L1 torque. Here, the operation will be described. When the sun gear G57 rotates counterclockwise in the drawing, the planet gear G58 rotates clockwise, and the support member 71 tries to revolve clockwise around the center line N1. Then, the revolution torque is the same as F1.
Since the torque is larger than the torque of × L1, the support member 7
1 revolves, and then the restricting member 73 rotates counterclockwise to release the lock.

Next, the state in which the tip portion 732 of the regulating member slides on the outer periphery 724 of the support member 72 will be described with reference to FIG. This state is an intermediate stage from the magenta M development to the cyan C development. The support member 72 is coaxial with the rotation axis G551 of the sun gear, and is partially provided with a groove 721 and an outer periphery 724.
A groove cam 723 is provided in the groove 721. On the other hand, the regulating member 73 is biased by the spring 734 in the counterclockwise direction in the drawing. Further, the casing 75 is the solenoid 7
4 is provided and a shaft 733 is provided. Further, the point of action P2 is the position where the tip portion 732 contacts the outer periphery 724, and the force F2 is the force that the outer periphery 724 receives from the tip portion 732, the dimension L
2 is the length of a perpendicular line that is lowered from the center line N2 of the rotation axis G551 in the F2 direction. The revolution torque that the support member 72 revolves is larger than the torque of F2 × L2. Here, the operation will be described. When the solenoid 74 is in the OFF state and the sun gear G55 rotates counterclockwise on the paper surface,
The planetary gear G56 rotates, and the supporting member 72 tries to revolve clockwise around the center line N2. Since the revolution torque is larger than the torque of F2 × L2, the revolution is possible.

Next, the state in which the regulating member is locked in the groove of the supporting member will be described with reference to FIG. It should be noted that the magnet is in the OFF state in the state of the cyan C developing supply. In the figure, the supporting member 72 is coaxial with the rotation axis G551 of the sun gear and is partially provided with a groove 7
21 is provided, and the groove cam 721 is provided with the groove cam 723. The tip 732 is in contact with the groove cam 723. On the other hand, the tip portion 731 is the outer periphery 71 of the support member 71.
4 away.

The operation of the drive mechanism of the developing device of the image forming apparatus will be described with reference to the drawings. First, the solenoid 74 is turned on, the regulation member 73 is drawn, and the tip portion 731 enters the groove 711 to regulate the rotation of the support member 71. When the motor 79 rotates forward in this state, the gears G51, G5
2, the sun gear G55 rotates via G53 and G54. Then, the supporting member 72 revolves around the planetary gear G56.
Engages with the gear G11 and rotates the developing sleeve 21Y via G12 and G13.

Next, when the motor 79 rotates in the reverse direction, the gear G
Sun gear G55 through 51, G52, G53, G54
Rotates. Then, the support member 72 revolves, the planetary gear G56 meshes with the gear G12, and G22, G23, G
The developing sleeve 21M is rotated via 24.

Further, when the motor 79 rotates in the forward direction, the sun gear G5 passes through the gears G51, G52, G53, G54.
5, the support member 72 revolves, and the solenoid 74 is turned off. Then, the revolving torque of the supporting member 71 is released because the supporting member 71 around the rotation axis of the supporting member 71, which is necessary for the tip 731 to escape from the groove 711, is larger than the releasing torque from the restricting member 73. Further, the rotational torque of the support member 72 around the rotation axis G551 is larger than the sliding torque of the support member 72 around the rotation axis G551 that is generated when the restriction member 73 slides on the outer periphery 724 of the support member 72. Therefore, the tip portion 732 enters the groove 721, and the rotation of the support member 72 is regulated by the regulation member 73.

When the motor 79 continues to rotate in the normal direction in this state, the sun gear G57 rotates via the gears G51, G52, G53, G54. Then, the support member 71 revolves, the planetary gear G58 meshes with the gear G31, and G32,
The developing sleeve 21C is rotated via G33.

Further, when the motor 79 rotates in the reverse direction, the sun gear G5 passes through the gears G51, G52, G53, G54.
7 rotates. Then, the support member 71 revolves, the planetary gear G58 meshes with the gear G41, and G42, G43,
The developing sleeve 21K is rotated via G44 and G45.

In this way, the forward and reverse rotations of the motor 79
When the solenoids are turned on and off, the four-color developing sleeves are sequentially rotated to form an image.

(Embodiment 2) The image forming apparatus of the embodiment eliminates the attitude difference of the supporting member unit. Explaining with reference to the drawings, FIG. 7 is a plan view and a side sectional view of the supporting member unit. The same members as those in the first embodiment are designated by the same reference numerals, and the description of those that are mechanically and functionally unchanged will be omitted.

In the figure, the support member unit 70A comprises a support member 72, a shaft G56a and a planetary gear G56 fitted to the shaft. A weight 724 is provided on the support member 72 so that the center of gravity of the support member unit is located on the center line N passing through the center of the shaft hole 721 of the support member 72.

As described above, since the center of gravity of the support member unit 70A is on the center line N even if the support member unit 70A rotates about the center line N, the support member unit 70A
Due to the difference in posture, it operates without being affected by gravity,
The drive mechanism is reliably switched. The support member 71
The same applies to the weight of.

(Third Embodiment) A modification of the second embodiment will be described with reference to the drawings. FIG. 8 is a plan view of another supporting member unit. The same members as those of the second embodiment are designated by the same reference numerals, and the description of those that are mechanically and functionally unchanged will be omitted. In the figure, the supporting member unit 70
B is a supporting member 78 and a shaft G56 provided on the supporting member 78.
a and a gear G56 fitted to the shaft G56a. The support member 78 is provided with two holes 782 so that the center of gravity of the support member unit 70B is on the center line N passing through the center of the shaft hole 786 of the support member 78.

As described above, even if the support member unit 70B rotates around the center line N, the support member unit 70B is rotated.
Since the center of gravity of is on the center line N of the sun gear, it operates without being affected by gravity due to the attitude difference of the supporting member unit 70B, and the switching of the drive mechanism is reliably performed. In addition,
The same applies to the support member 71.

[0047]

According to the above configuration, the following effects can be obtained.

According to a first aspect of the present invention, a torque about which the support member rotates around the rotation axis of the sun gear is defined as a rotation torque, and the support around the rotation axis is generated when the regulating member slides on the outer periphery of the support member. When the sliding torque of the member is used, the rotational torque is larger than the sliding torque, so that the operation of the drive mechanism is ensured.

According to a second aspect, in the image forming apparatus according to the first aspect, since the sliding surface of the regulating member of the regulating means is a synthetic resin member having better slidability than a general member, the driving mechanism operates. Will be certain.

According to a third aspect of the present invention, the torque by which the support member rotates around the rotation axis of the sun gear is defined as the rotation torque, and the torque around the rotation axis of the sun gear generated when the regulating member escapes from the groove of the support member. When the release torque is used, the rotation torque is larger than the release torque, so that the switching operation of the drive mechanism is surely performed.

In the present invention, since the center of gravity of the supporting member unit is provided in the vicinity of the rotation axis of the sun gear, it operates without being affected by the gravity of the supporting member unit including the planetary gears, and the switching of the drive mechanism is reliable. Image forming apparatus.

According to a fifth aspect, in the image forming apparatus according to the fourth aspect, since the supporting member unit is provided with the weight member, the supporting member unit including the planetary gear operates without being affected by the gravity, and the driving mechanism is operated. The image forming apparatus has a reliable switching.

According to a sixth aspect of the present invention, in the image forming apparatus according to any one of the first to fifth aspects, the driven gear is a driving gear of a developing device that supplies toner to the image forming body.
The image forming apparatus is capable of reliably operating the drive unit of the developing unit, such as the drive of the developing sleeve and the switching of the drive mechanism for the toner supply drive, without being affected by the gravity of the support member unit.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an image forming apparatus suitable for application of the image forming apparatus of the present invention.

FIG. 2 is a mechanism diagram of a common drive motor of a developing device and its transmission gear train.

FIG. 3 is a drive mechanism diagram having a planetary gear mechanism of each developing device.

FIG. 4 is an explanatory diagram of a torque when a regulating member escapes from a groove of a support member.

FIG. 5 is an explanatory diagram of a torque when the regulating member slides on the outer periphery of the supporting member.

FIG. 6 is a state diagram in which a regulating member is locked in a groove of a support member.

FIG. 7 is a plan view and a side sectional view of a support member unit.

FIG. 8 is a plan view of another support member unit.

[Explanation of symbols]

10 image carrier (photosensitive drum) 11 PCL 12 charger 13 laser writing device 131 rotating polygon mirror 132 fθ lens 15 static eliminator 16 cleaning device 16a cleaning blade 20 developing device (developing device) 21 developing sleeve 21Y, 21M, 21C, 21K Developing sleeve 30 Transfer belt device 31 Transfer belt 32 Holding roller 32a Shaft 33 Holding roller 33a Shaft 34 Brush 35 Nip portion 36 Discharger 37 Cleaning blade 40 Paper feeding cassette 41,42 Paper feeding roller 43 Timing roller 50 Fixing device 56,57 , 58 Discharge roller 59 Tray part 70A, 70B Support member unit 71 Support member 711 Groove 713 Groove cam 714 Outer peripheral surface 72 Support member 721 Groove 723 Groove cam 724 Outer peripheral surface 725 Weight 726 Shaft hole 7 Regulating member 731, 732 tip 733 shaft 734 spring 74 solenoid 75 casing 78 supporting member 782 holes 786 shaft hole 79 motor L1, L2 dimension F1, F2 force G11, G12, G13, G21, G22, G23, G
24, G31, G32 G33, G41, G42, G4
3, G44, G45, G51, G52, G53, G54
Gear G55 Sun gear G56 Planetary gear G57 Sun gear G58 Planetary gear G56a, G58a Shaft G551, G571 Rotating shaft M1, M2, M3 Reflector N1, N2 Center line P Transfer paper P1, P2 Action point F1, F2 force

Claims (6)

[Claims] 1. A drive source, a sun gear driven by the drive source, a planetary gear driven by the sun gear and capable of revolving around a rotation axis of the sun gear, and the planet by the revolution of the planetary gear. A driven gear in an image forming apparatus that is driven by rotation of a planetary gear that meshes with a gear, a support member that supports the planetary gear and has the same axis as the rotation axis of the sun gear, and a regulation that restricts rotation of the support member. And a regulation means having a member, wherein the torque that causes the support member to rotate around the rotation axis of the sun gear is rotational torque, and the rotation axis is generated around the rotation axis when the regulation member slides on the outer periphery of the support member. Wherein the rotation torque is larger than the sliding torque, when the torque of is the sliding torque. 2. The image forming apparatus according to claim 1, wherein the sliding portion of the regulation member is a synthetic resin material. 3. A drive source, a sun gear driven by the drive source, a planetary gear that is driven by the sun gear and can revolve around a rotation axis of the sun gear, and the planetary gear revolves to revolve around the sun gear. The driven gear in the image forming apparatus which is meshed with the planetary gear and driven by the rotation of the planetary gear, the support member which supports the planetary gear and is coaxial with the rotation axis of the sun gear, and is locked in the groove provided in the support member And a regulation means for regulating the rotation of the support member, and the torque for the support member to rotate around the rotation shaft is a rotation torque,
An image forming apparatus, wherein when the torque around the rotation shaft generated when the regulating member escapes from the groove of the support member is defined as a release torque, the rotation torque is larger than the release torque. 4. A drive source, a sun gear driven by the drive source, a planetary gear that is driven by the sun gear and can revolve around the rotation axis of the sun gear, and the planet by the revolution of the planetary gear. The driven gear is a gear that is driven by the rotation of the planetary gears to rotate, and a support member unit that has the planetary gear and is coaxial with the rotation shaft of the sun gear, and the support member unit is located near the rotation shaft of the sun gear. An image forming apparatus having a center of gravity. 5. The image forming apparatus according to claim 4, wherein the supporting member unit is provided with a weight so that the center of gravity is near the rotation axis of the sun gear. 6. The image forming apparatus according to claim 1, wherein the driven gear is a gear of a developing device that supplies toner to the image forming body.