JP2017009078A - Driving force transmission device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving force transmission device and an image forming apparatus capable of suppressing a twist due to a rotational load and vibration, noise and rotational unevenness due to rattling of a carrier.SOLUTION: A driving force transmission device includes a planet gear mechanism including: a sun gear which receives driving force via an input shaft and rotates; an internal tooth gear which is provided with an internal tooth on an internal surface of a cylindrical body and is disposed coaxially with the sun gear; a plant gear which is engaged with the sun gear and the internal tooth gear and revolves while rotating; and a rotary member which supports a shaft of the planet gear, has a peripheral edge section rotationally supported by the internal surface of the cylindrical body and rotates with the input shaft as a rotation center by the revolution of the planet gear. The cylindrical body of the internal tooth gear is fixed to an internal surface of a driven member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a driving force transmission device and an image forming apparatus.

  In a rotating body drive apparatus comprising a speed reduction means for reducing the rotation from the drive source to a desired rotational speed and transmitting it to the cylindrical rotary body, the speed reduction means being disposed in the side end of the cylindrical rotary body. A positioning means for detachably supporting the body with respect to the speed reducing means and positioning the cylindrical rotating body in the direction of the rotation axis and in a direction perpendicular to the direction of the rotation axis. There is known a rotating body drive device that is slidable in the direction of the rotation axis with respect to the side end of the body and is coupled so as to be able to transmit rotation by a coupling portion having a clearance in the direction perpendicular to the direction of the rotation axis. (Patent Document 1).

JP 2011-186167 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a driving force transmission device and an image forming apparatus capable of suppressing torsion due to rotational load, vibration due to rattling of the carrier, noise, and rotational unevenness.

In order to solve the above problem, the driving force transmission device according to claim 1,
A sun gear that rotates by receiving a driving force via an input shaft;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear revolving while meshing with the sun gear and the internal gear;
A planetary gear mechanism that includes a rotating member that supports the shaft of the planetary gear, a peripheral portion is rotatably supported on the inner surface of the cylindrical body, and rotates about the input shaft by the revolution of the planetary gear. ,
The cylindrical body of the internal gear is fixed to the inner surface of the driven member;
It is characterized by that.

The invention according to claim 2 is the driving force transmission device according to claim 1,
A concave groove or convex portion is formed on the outer surface of the cylindrical body in the input axis direction, and a convex portion or the convex portion that fits into the concave groove fits on the inner surface of the driven body. The groove is formed to extend in the axial direction,
It is characterized by that.

The invention according to claim 3 is the driving force transmission device according to claim 1 or 2,
The rotating member is integrally formed with a first disc portion, a second disc portion facing the first disc portion, and an output shaft projecting in the input shaft direction from the second disc portion, and the output A shaft is fixed to a support member of a device using the driving force transmission device in a radial direction and is supported so as not to rotate, and serves as a rotation center of the driven member.
It is characterized by that.

The invention according to claim 4 is the driving force transmission device according to claim 3,
The output shaft has a flat portion on the outer surface, and the flat portion is inserted into a bearing hole provided in the support member and is supported so as not to rotate.
It is characterized by that.

The invention according to claim 5 is the driving force transmission device according to any one of claims 1 to 4,
The output shaft has a through hole, and rotatably supports the input shaft inserted through the through hole.
It is characterized by that.

A sixth aspect of the present invention provides the driving force transmission device according to any one of the first to fifth aspects,
One end side of the input shaft is rotatably supported by the through-hole of the output shaft, and the other end side is rotatably supported by the inner surface of the driven body and penetrates the inner surface of the driven body in the axial direction.
It is characterized by that.

The invention according to claim 7 is the driving force transmission device according to any one of claims 1 to 6,
A plurality of stages of the planetary gear mechanism having the rotating member in which the input shaft passes through the output shaft and a sun gear is integrally provided in the second disc portion;
It is characterized by that.

In order to solve the above problem, an image forming apparatus according to claim 8,
Drive means for rotating the sun gear of the driving force transmission device according to any one of claims 1 to 7,
An image forming unit that forms an image by receiving driving of the driving force transmission device,
It is characterized by that.

According to the first aspect of the present invention, the rotational load of the rotating member is less than that supported by the inner surface of the hollow portion of the internal gear and the driven body is not fixed to the internal gear. It is possible to suppress vibration, noise, and rotation unevenness caused by twisting due to the carrier and rattling of the carrier.
According to the second aspect of the present invention, the internal gear and the driven body can be easily fixed.
According to invention of Claim 3 and 4, a driving force transmission apparatus can be reduced in size.
According to the fifth aspect of the present invention, it is possible to suppress vibration, noise, and rotation unevenness due to carrier backlash.
According to the sixth aspect of the present invention, vibration and rotational unevenness of the driven body can be suppressed.
According to the seventh aspect of the present invention, the necessary decelerated rotation can be easily obtained.
According to the eighth aspect of the present invention, it is possible to suppress torsion due to rotational load, vibration due to rattling of the carrier, noise, and rotation unevenness.

2 is a schematic cross-sectional view showing an internal configuration of the image forming apparatus 1. FIG. 2 is an exploded perspective view showing an example of a driving force transmission device 100. FIG. (A) is a fragmentary sectional perspective view which shows an example of the driving force transmission apparatus 100, (b) is a partial expansion longitudinal cross-sectional view. (A) is a perspective view with a viewpoint on the first disc portion 151 side of the carrier 150, (b) is a perspective view with a viewpoint on the output shaft 153 side, and (c) is a sun gear 120A provided integrally. 5 is a perspective view with a viewpoint on the output shaft 153 side of the carrier 150. FIG. 3 is a perspective view of an internal gear 130. FIG. It is a perspective view which shows the assembly | attachment to the carrier 150 of the planetary gear 140. FIG. It is a perspective view of the internal gear 130 with which the carrier 150 which rotationally supported the planetary gear 140 was assembled. FIG. 3 is a schematic longitudinal sectional view showing a state in which the driving force transmission device 100 is fitted to a photosensitive drum 31 as a driven body. It is a longitudinal cross-sectional schematic diagram of the principal part of the driving force transmission apparatus 200 which concerns on a modification. . 3 is a schematic vertical sectional view of an in-wheel mechanism 300. FIG.

Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and specific examples. However, the present invention is not limited to these embodiments and specific examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, and the up-down direction is the Z-axis direction.
(1) Overall Configuration and Operation of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing the internal configuration of the image forming apparatus 1 according to this embodiment.
Hereinafter, the overall configuration and operation of the image forming apparatus 1 will be described with reference to the drawings.

  The image forming apparatus 1 includes a control device 10, a paper feeding device 20, a photoreceptor unit 30, a developing unit 40, a transfer unit 50, and a fixing device 60. On the upper surface (Z direction) of the image forming apparatus 1, a discharge tray 1a for discharging and storing a sheet on which an image is recorded is formed.

  The control device 10 includes an image forming device control unit 11 that controls the operation of the image forming device 1, a controller unit 12 that prepares image data according to a print processing request, an exposure control unit 13 that controls lighting of the exposure head LH, It has a power supply device 14 and the like. The power supply device 14 applies a voltage to a charging roller 32, a developing roller 42, a primary transfer roller 52, a power supply roller 54 and the like, which will be described later, and also includes an exposure head LH, a paper feeding device 20, a fixing device 60, and each sensor provided. To supply power.

  The controller unit 12 converts print information input from an external information transmitting apparatus (for example, a personal computer) into image information for forming a latent image and outputs a drive signal to the exposure head LH at a preset timing. . The exposure head LH of the present embodiment is configured by an LED head in which a plurality of light emitting elements (LEDs) are linearly arranged along the main scanning direction.

  A paper feeding device 20 is provided at the bottom of the image forming apparatus 1. The sheet feeding device 20 includes a sheet stacking plate 21, and a plurality of sheets P as recording media are stacked on the upper surface of the sheet stacking plate 21. The paper P loaded on the paper stacking plate 21 and whose position in the width direction is determined by a regulating plate (not shown) is pulled out one by one from the top by the paper pulling unit 22 (−X direction), and then registered. It is conveyed to the nip portion of the pair 23.

  The photoconductor unit 30 includes a photoconductor drum 31 that is provided in parallel above the paper feeding device 20 (in the Z direction) and serves as an image carrier that is rotationally driven. A charging roller 32, an exposure head LH, a developing unit 40, a primary transfer roller 52, and a cleaning blade 34 are arranged along the rotation direction of the photosensitive drum 31. A cleaning roller 33 for cleaning the surface of the charging roller 32 is disposed opposite to and in contact with the charging roller 32.

The developing unit 40 has a developing housing 41 in which a developer is accommodated. In the developing housing 41, a developing roller 42 disposed to face the photosensitive drum 31, and a pair of augers 44 that stir and convey the developer to the developing roller 42 side obliquely below the back side of the developing roller 42, 45 is arranged. A layer regulating member 46 that regulates the layer thickness of the developer is disposed in proximity to the developing roller 42.
Each of the developing units 40 is configured in the same manner except for the developer contained in the developing housing 41, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). .

  The surface of the rotating photosensitive drum 31 is charged by the charging roller 32, and an electrostatic latent image is formed by the latent image forming light emitted from the exposure head LH. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42.

  The transfer unit 50 includes an intermediate transfer belt 51 to which each color toner image formed on the photoconductive drum 31 of each photoconductor unit 30 is transferred, and each color toner image formed on each photoconductor unit 30 to the intermediate transfer belt. A primary transfer roller 52 that sequentially transfers (primary transfer) to 51 is provided. Further, a secondary transfer roller 53, which is an example of a transfer unit that collectively transfers (secondary transfer) each color toner image transferred on the intermediate transfer belt 51 onto the paper P, and secondary transfer to the secondary transfer roller 53. The power supply roller 54 is an example of a power supply member that supplies power to the bias.

  Each color toner image formed on the photosensitive drum 31 of each photosensitive unit 30 is transferred to an intermediate transfer belt by a primary transfer roller 52 to which a predetermined transfer voltage is applied from a power supply device 14 or the like controlled by the image forming apparatus control unit 11. Electrostatic transfer (primary transfer) is sequentially performed on 51, and a superimposed toner image in which toners of respective colors are superimposed is formed.

  The superimposed toner image on the intermediate transfer belt 51 is conveyed to a region (secondary transfer portion T) where the secondary transfer roller 53 is disposed as the intermediate transfer belt 51 moves. When the superimposed toner image is conveyed to the secondary transfer unit T, the paper P is supplied from the paper feeding device 20 to the secondary transfer unit T in accordance with the timing. A predetermined transfer voltage is applied to the power supply roller 54 from the power supply device 14 or the like controlled by the image forming apparatus control unit 11, and the intermediate transfer is performed on the paper P that is fed from the registration roller pair 23 and guided by the conveyance guide. Multiple toner images on the belt 51 are collectively transferred.

  Residual toner on the surface of the photosensitive drum 31 is removed by the cleaning blade 34 and collected in the waste developer container. The surface of the photosensitive drum 31 is recharged by the charging roller 32. Residues that cannot be completely removed by the cleaning blade 34 and adhere to the charging roller 32 are captured and accumulated on the surface of the cleaning roller 33 that rotates in contact with the charging roller 32.

  The fixing device 60 includes a fixing unit 600, a conveyance roller pair 68, and a discharge roller pair 69. The fixing unit 600 includes a heating module 61 and a pressure module 62, and a fixing nip portion N (fixing area) is formed by a pressure contact area between the heating module 61 and the pressure module 62.

The paper P on which the toner image is transferred in the transfer unit 50 is conveyed to the fixing device 60 via the conveyance guide in a state where the toner image is not fixed. The toner image is fixed on the sheet P conveyed to the fixing device 60 by a pair of heating module 61 and pressure module 62 by the action of pressure bonding and heating.
The sheet P on which the fixing toner image is formed is discharged from the discharge roller pair 69 to the discharge tray 1 a on the upper surface of the image forming apparatus 1 via the conveyance roller pair 68.

(2) Driving force transmission device FIG. 2 is an exploded perspective view showing an example of the driving force transmission device 100, FIG. 3A is a partial sectional perspective view showing an example of the driving force transmission device 100, and FIG. 4A is a perspective view with the viewpoint on the first disc portion 151 side of the carrier 150, FIG. 4B is a perspective view with the viewpoint on the output shaft 153 side, and FIG. 4C is the sun gear 120A. FIG. 5 is a perspective view of the internal gear 130, FIG. 6 is a perspective view of the planetary gear 140 assembled to the carrier 150, and FIG. FIG. 3 is a perspective view of an internal gear 130 in which a carrier 150 that rotatably supports a planetary gear 140 is assembled.
Hereinafter, the configuration and operation of the driving force transmission device 100 will be described with reference to the drawings.

(2.1) Overall Configuration of Driving Force Transmission Device FIG. 2 shows an example of the driving force transmission device 100 in which the planetary gear mechanism 100A has a three-stage configuration, but the driving force transmission device according to the present embodiment. 100 can be configured by overlapping the planetary gear mechanism 100A according to the required reduction ratio.

  The driving force transmission device 100 includes an input shaft 110, a sun gear 120 that rotates by receiving driving force from the input shaft 110, an internal gear 130 that is arranged coaxially with the sun gear 120, and the sun gear 120 and the internal gear 130. A planetary gear mechanism comprising a plurality of planetary gears 140 that revolve while meshing with each other and a shaft portion 141 of the planetary gear 140 and a carrier 150 as a rotating member that rotates about the input shaft 110 by the revolution of the planetary gear 140. 100A, a connecting member 160 that connects the planetary gear mechanisms 100A stacked in a plurality of stages, and holding plates 170 and 171 that hold the planetary gear mechanism 100A that is stacked in a plurality of stages by the connecting member 160 from both sides. And a bush 173 that supports the output shaft 153.

(2.2) Input shaft One end of the input shaft 110 is connected to a motor M (not shown) as a drive source, and transmits the driving force of the motor M to the sun gear 120. In the present embodiment, the key member 112 is fitted between the D surface 111 formed on the shaft and the key groove 121 formed in the shaft hole of the sun gear 120 so that the sun gear 120 is fixed to the input shaft 110. And driving force is transmitted.
One end side of the input shaft 110 is rotatably supported by the through hole of the output shaft 153, and the other end side is rotatably supported by the inner surface of the cylindrical member 180 as a driven body via a bearing BR. It penetrates.

(2.3) Carrier As shown in FIGS. 4A and 4B, the carrier 150 as an example of the rotating member includes a first disc portion 151 and a second disc facing the first disc portion 151. The output shaft 153 protruding in the input shaft direction from the portion 152 and the second disc portion 152 is integrally formed.

  The first disc portion 151 and the second disc portion 152 are formed with groove portions 154 and 155 that open in the radial direction by opening the respective peripheral portions 151a and 152a. The groove portions 154 and 155 have a bottom portion formed in a circular shape, and have a snap-fit structure for rotating and supporting the shaft portion 141 of the planetary gear 140 and positioning the inserted shaft portion 141 (see FIG. 6).

The first disc portion 151 has a larger-diameter flange shape than the second disc portion 152, and the peripheral portion 151a is rotatably supported by the inner surface 132 of the hollow portion of the internal gear 130, which will be described later. With 140 revolutions, the input shaft 110 rotates about the rotation center.
The second disc portion 152 has a diameter smaller than the tip circle of the internal tooth 133 of the internal gear 130 and is inserted through the input shaft 110 in a state where the planetary gear 140 is incorporated (see FIG. 6). 140 meshes with the internal teeth 133 formed on the inner surface 132 of the hollow portion of the internal gear 130 (see FIG. 7).

An output shaft 153 protruding in the axial direction of the input shaft 110 is integrally formed on the outer surface of the second disc portion 152. A flat portion 153a is formed as a double D-cut surface on the outer surface of the output shaft 153, and is inserted into a bearing hole formed in a frame side plate F as an example of a support member of the image forming apparatus 1 main body. It is fixed to the side plate F so as not to rotate.
Further, when the carrier 150 is configured by overlapping a plurality of stages, as shown in FIG. 3C, the sun gear 120 </ b> A is integrally provided on the second disc portion 152 as an output shaft.

(2.4) Internal Gear As shown in FIG. 5, the internal gear 130 includes a cylindrical support 131 having a hollow part as a whole, and an internal tooth 133 formed at the center of the inner surface 132 of the hollow part. Consists of.
Both sides of the inner surface 132 on which the inner teeth 133 are formed are cylindrical, and the peripheral edge portion 151a of the first disc portion 151 of the carrier 150 is in contact with one end side to rotatably support the carrier 150 from the outside.

The support 131 is formed with a convex portion 131a protruding in the axial direction of the input shaft 110 and a concave portion 131b that fits the convex portion 131a. When the support 131 is formed by overlapping a plurality of stages, the convex portion 131a and the concave portion 131b fit. Accordingly, the planetary gear mechanism 100A is coaxially superimposed.
A plurality of concave groove portions 134 are formed on the outer surface of the support 131, and the cylindrical member 180 is rotationally driven by fitting into a convex portion 180a formed on the inner surface of the cylindrical member 180 so as to extend in the axial direction.

  In each internal gear 130, the convex 131 a and the concave 131 b are fitted to each other, the planetary gear mechanism 100 A is coaxially overlapped, and a plurality of concave grooves 134 formed on the outer surface of the support 131 are formed on the inner surface of the cylindrical member 180. It becomes the structure which fitted and integrated with the convex-shaped part 180a formed in this. As a result, the torsional rigidity of the cylindrical member 180 to which the rotation is transmitted increases, and the torsion due to the rotational load is suppressed.

(2.6) Material The sun gear 120, the internal gear 130, the planetary gear 140, and the carrier 150 of the planetary gear mechanism 100A are formed of a molded product using a synthetic resin material. Synthetic resin materials include POM (polyacetal), PA (polyamide), PC (polycarbonate), PET (polyethylene terephthalate), PPS (polyphenylene sulfide), LCP (liquid crystal polymer), or synthetic fibers made of glass fiber or carbon fiber. Examples include reinforced synthetic resin added.

  In addition, the holding plates 170 and 171 that hold the planetary gear mechanism 100A that is stacked in a plurality of stages from both sides are also formed of a molded product using a synthetic resin material. The bush 173 that supports the output shaft 153 may be formed using a synthetic resin material such as POM (polyacetal) or may be formed of a sintered material having self-lubricating properties.

(2.6) Carrier Support Structure The planetary gear mechanism 100A configured as described above has an output shaft 153 formed by projecting the carrier 150 on the outer surface of the second disc portion 152 in the axial direction of the input shaft 110. The peripheral edge portion 151 a of the first disc portion 151 is in contact with one end of both sides of the inner surface 132 of the internal gear 130 and is rotatably supported by the penetrating input shaft 110.
As a result, the carrier 150 that rotates and supports the plurality of planetary gears 140 that rotate while revolving while meshing with the sun gear 120 and the internal gear 130 is supported at both ends with the planetary gears 140 interposed therebetween, and vibration due to rattling of the carrier 150, Noise and rotation unevenness are suppressed.

One end of the input shaft 110 passes through the output shaft 153 of the carrier 150 and rotates and supports the carrier 150 stacked in a plurality of stages so that each carrier 150 is positioned coaxially. Therefore, it is the structure which can suppress the dispersion | variation in the coaxial degree of each planetary gear mechanism 100A to be piled up.
The cylindrical member 180 is rotatably supported on the inner surface of the cylindrical member 180 via a bearing BR and penetrates the inner surface of the cylindrical member 180 in the axial direction. Therefore, vibration and rotation unevenness of the cylindrical member 180 as a driven body are suppressed.

(2.7) Operation In the driving force transmission device 100 according to the present embodiment, the output shaft 153 of the carrier 150 is fixed to the frame side plate F of the main body of the image forming apparatus 1 as an example of a device using the driving force transmission device 100. In this state, the input shaft 110 is rotated by driving the motor M, and the sun gear 120 fixed to the input shaft 110 with the key member 112 is rotationally driven.

When the sun gear 120 is driven to rotate, each of the three planetary gears 140 rotates around its own shaft portion 141 as the rotation center. In the carrier 150, the output shaft 153 is fixed to be non-rotatable and the revolution of the planetary gear 140 is fixed. Therefore, the internal gear 130 in which each of the three planetary gears 140 meshes with the internal teeth 133 rotates at a reduced speed, and the internal teeth The cylindrical member 180 fitted to the support 131 of the internal gear 130 is rotationally driven together with the reduced speed rotation of the gear 130.
In the driving force transmission device 100 according to the present embodiment, the planetary gear mechanism 100A is configured to be overlapped in three stages, so that the rotation reduced in three stages is transmitted to the cylindrical member 180.

"Example 1"
FIG. 8 is a schematic longitudinal sectional view showing a state in which the driving force transmission device 100 according to the present embodiment is fitted to the photosensitive drum 31 as a driven body.
The driving force transmission device 100 is fitted on the inner surface of the photosensitive drum 31, and a plurality of concave grooves 134 formed on the outer surface of the support 131 are formed on the inner surface of the photosensitive drum 31 so as to extend in the axial direction. It fits in the shape part 31a and is mutually fixed.

The output shaft 153 of the carrier 150 is non-rotatably fixed to the frame side plate F of the main body of the image forming apparatus 1, and the input shaft 110 is rotatably supported at one end side by the center hole 153 b of the output shaft 153 of the carrier 150. It is connected to M (not shown).
The other end side of the input shaft 110 is rotatably supported by the flange FR of the photosensitive drum 31 via a bearing BR.

As a result, in the photosensitive drum 31 in which the driving force transmission device 100 is fitted on one end side, the input shaft 110 is rotatably supported through the inner surface of the photosensitive drum 31, and the input shaft 110 that receives the rotational drive of the motor M is received. Is transmitted from the sun gear 120 to the planetary gear 140.
The planetary gear 140 meshes with the internal gear 130 in a state where the carrier 150 is fixed, and the internal gear 130 rotates. The reduced speed rotation of the internal gear 130 causes the photosensitive drum 31 fixed to the outer surface of the internal gear 130 to rotate. Communicated.

  In the driving force transmission device 100, the carrier 150 that rotatably supports the planetary gear 140 is supported on both sides of the planetary gear 140, the backlash of the carrier 150 is suppressed, and the vibration, noise, and rotation unevenness of the photosensitive drum 31 are suppressed. . Further, a planetary gear mechanism 100A that is coaxially overlapped is integrally fixed to the inner surface of the photosensitive drum 31 to suppress twisting due to a rotational load, and a tandem type image formation in which a plurality of photosensitive drums 31 are arranged in parallel is formed. In the apparatus 1, the phase shift of each photosensitive drum 31 can be suppressed.

"Modification"
FIG. 9 is a schematic longitudinal sectional view of a main part of a driving force transmission device 200 according to a modification.
The driving force transmission device 200 is fitted into a photosensitive drum 31 as a driven body, and an input shaft 110 is connected to a motor M as a driving source by a magnet coupling 210 as a contacted coupling.

The driving force from the motor M as a driving source is transmitted to the input shaft 110 of the driving force transmission device 200 through the magnet coupling 210, and the rotational driving force input from one end of the input shaft 110 is superposed in three stages. The planetary gear mechanism 100A is decelerated.
In the driving force transmission device 200, the internal gear 130 rotates while the output shaft 153 of the carrier 150 is fixed, and the rotational drive is a photoconductor fixed to the outer surface of the internal gear 130 together with the reduced rotation of the internal gear 130. It is transmitted to the drum 31.

  Between the magnet couplings 210, a planetary gear mechanism 100 </ b> A configured to perform stable non-contact drive transmission with low torque to the input shaft 110, and to transmit rotation to the input shaft 110 and then overlap the input shaft 110. Will slow down. Therefore, it is possible to generate a high torque rotational driving force while suppressing vibration in driving transmission to the photosensitive drum 31.

"Example 2"
FIG. 10 is a schematic longitudinal sectional view of the in-wheel mechanism 300.
In the in-wheel mechanism 300, the planetary gear mechanism 100A inserted through the output shaft 311 of the motor 310 as a drive source is superimposed on three stages and fixed to the inner surface of the wheel 320 as the driven body. The wheel 320 is rotatably supported via a bearing 321 with respect to the output shaft 311 of the motor 310, and the wheel 322 is connected to the outer peripheral surface of the output shaft 153 of the carrier 150 fixed to the holding member 330 of the motor 310 via the bush 173. Is rotatably supported facing the wheel 320.

In the in-wheel mechanism 300 configured as described above, the wheels 320 and 322 fixed to the outer surface of the internal gear 130 are decelerated by the planetary gear mechanism 100A configured by superimposing the rotational drive of the motor 310 in three stages. Is transmitted to.
For example, a rubber roll member 430 can be attached to the wheels 320 and 322.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Control apparatus 20 ... Paper feeding apparatus 30 ... Photoconductor unit 31 ... Photoconductor drum 40 ... Development unit 50 ... Transfer unit 60 ... Fixing device 100, 200 ... Drive transmission device 100A ... Planetary gear mechanism 110 ... Input shaft 120, 120A ... Sun gear 130 ... Internal gear 131 ... Support body 132 ... Inner surface (Cylindrical part)
133 ... Inner teeth 140 ... Planetary gear 141 ... Shaft part 150 ... Carrier 151 ... First disk part 152 ... Second disk part 153 ... Output shaft 160 ... -Connecting members 170, 171 ... Holding plate 173 ... Bush 180 ... Cylindrical member 300 ... In-wheel mechanism

Claims (8)

A sun gear that rotates by receiving a driving force via an input shaft;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear revolving while meshing with the sun gear and the internal gear;
A planetary gear mechanism that includes a rotating member that supports the shaft of the planetary gear, a peripheral portion is rotatably supported on the inner surface of the cylindrical body, and rotates about the input shaft by the revolution of the planetary gear. ,
The cylindrical body of the internal gear is fixed to the inner surface of the driven member;
A driving force transmission device characterized by that. A concave groove or convex portion is formed on the outer surface of the cylindrical body in the input axis direction, and a convex portion or the convex portion that fits into the concave groove fits on the inner surface of the driven body. The groove is formed to extend in the axial direction,
The driving force transmission device according to claim 1. The rotating member is integrally formed with a first disc portion, a second disc portion facing the first disc portion, and an output shaft projecting in the input shaft direction from the second disc portion, and the output A shaft is fixed to a support member of a device using the driving force transmission device in a radial direction and is supported so as not to rotate, and serves as a rotation center of the driven member.
The driving force transmission device according to claim 1 or 2, The output shaft has a flat portion on the outer surface, and the flat portion is inserted into a bearing hole provided in the support member and is supported so as not to rotate.
The driving force transmission device according to claim 3. The output shaft has a through hole, and rotatably supports the input shaft inserted through the through hole.
The driving force transmission device according to any one of claims 1 to 4, wherein the driving force transmission device is provided. One end side of the input shaft is rotatably supported by the through-hole of the output shaft, and the other end side is rotatably supported by the inner surface of the driven body and penetrates the inner surface of the driven body in the axial direction.
The driving force transmission device according to claim 1, wherein the driving force transmission device is a driving force transmission device. A plurality of stages of the planetary gear mechanism having the rotating member in which the input shaft passes through the output shaft and a sun gear is integrally provided in the second disc portion;
The driving force transmission device according to claim 1, wherein the driving force transmission device is a driving force transmission device. Drive means for rotating the sun gear of the driving force transmission device according to any one of claims 1 to 7,
An image forming unit that forms an image by receiving driving of the driving force transmission device,
An image forming apparatus.

Images