JP5045883B2 - Drive transmission device, drive device, and image forming apparatus - Google Patents

Description

  The present invention relates to a drive transmission device, a drive device, and an image forming apparatus.

  A technique related to a drive transmission device is known that supports a rotating body made of, for example, a gear or the like so as to be rotatable using a support member such as an apparatus frame or an apparatus housing. Further, there is known a technique related to a drive device, which includes a drive transmission device as described above and a drive source that inputs a drive force to the drive transmission device. Further, there is known a technique related to an image forming apparatus, which includes a driving apparatus as described above and an image forming related member such as a photoconductor that outputs a driving force from the driving apparatus (Patent Document). 1, Patent Document 2, Patent Document 3).

JP 2000-72279 A JP 2002-351284 A JP 2003-148503 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a drive transmission device, a drive device, and an image forming apparatus that are easier to assemble and can be miniaturized than before.

The present invention according to claim 1 is composed of a first rotating body capable of connecting the second rotating body and a main body frame, and a convex portion inserted into one end side of the first rotating body includes the main body frame. A first support member that is integrally formed and rotatably supports one end side of the first rotating body, and an insertion hole into which the other end side of the first rotating body is inserted are formed. A second support member that rotatably supports the other end of the rotating body, an impact absorbing member that absorbs an impact caused by the rotation of the first rotating body, the first rotating body, and the second rotating body. A friction coefficient lowering member that reduces the friction coefficient between the first rotating body and the support member. The first rotating body is inserted into the hollow cylindrical portion and the insertion hole, and has substantially the same diameter as the insertion hole. An insertion portion, and the first support member side of the insertion portion, the large diameter portion having a larger diameter than the insertion hole, A step surface formed between the insertion portion and the large-diameter portion in a direction substantially perpendicular to the rotational axis direction, and the shock absorbing member and the friction coefficient reducing member include the step surface and the first step surface. The shock absorbing member is in contact with the second support member, and the friction coefficient reducing member is in contact with the first rotating body between the two support members, A spiral groove is formed, and the second rotary body is connected to the first rotary body so that a spiral rib formed on an axis of the second rotary body is engaged with the spiral groove. And the step surface is capable of contacting the second support member, and movement of the first rotating body in the rotation axis direction is restricted by the second support member. Device.
Therefore, it is not necessary to use a rotating shaft or the like to support the rotating body, the structure can be simplified as compared with the conventional structure, the assembly is easy, and the size can be reduced. Further, the inside of the rotating body is supported by the convex portion, and the outside of the rotating body is supported by the insertion hole. Thus, since the rotating body is supported so as to be sandwiched between the inner side and the outer side, the rotating body is favorably supported. Also, for example, when a rotating body is supported so that both ends are inserted into the insertion holes, if the two insertion holes are misaligned, a load is applied to both sides of the rotating body, and a torsional force is generated on the rotating body. In contrast to this, in this configuration, a load is not easily applied to the side on which the convex portion of the rotating body is inserted, so that a torsional force is hardly generated on the rotating body. Moreover, since the first support member does not have an insertion hole, it is possible to make it difficult for the lubricant to leak out even when a lubricant such as grease is used.

The present invention according to claim 2, wherein the first rotary member is a drive transmission device according to claim 1, wherein the gear train is formed. Therefore, it is possible to input a driving force to the rotating body and output the driving force from the rotating body by using the gear train, and it is possible to perform drive transmission more satisfactorily.

According to a third aspect of the present invention, there is provided a drive device comprising: the drive transmission device according to the first or second aspect; and a drive source that inputs a drive force to the drive transmission device.

According to a fourth aspect of the present invention, there is provided an image comprising: the driving device according to the third aspect; and an image formation-related member that outputs a driving force from the driving device and is used for image formation or sheet conveyance. Forming device.

  According to the present invention, it is possible to provide a drive transmission device, a drive device, and an image forming apparatus that are easier to assemble and can be miniaturized than before.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of an image forming apparatus 10 according to an embodiment of the present invention. The image forming apparatus 10 includes an image forming apparatus main body 12, and a discharge unit 16 is provided on the upper portion of the image forming apparatus main body 12. An image forming unit 14 and, for example, two-stage sheet supply devices 18 and 18 are mounted in the image forming apparatus main body 12.

  The image forming means 14 is of an electrophotographic type, and is a drum-shaped photoconductor 28 used as an image forming member, a charging device 30 for uniformly charging the photoconductor 28, and a photoconductor 28 charged by the charging device 30. An optical writing device 32 for writing a latent image by light on the surface, a developing device 34 for visualizing the latent image formed on the surface of the photoreceptor 28 by the optical writing device 32 with a developer, and a developer image by the developing device 34 as a sheet A transfer device 36 composed of, for example, a transfer roll, a cleaning device 38 provided with a cleaning blade 37 for cleaning the developer remaining on the photoreceptor 28, and a developer image on the sheet transferred by the transfer device 36. And a fixing device 40 for fixing the toner to the image. The optical writing device 32 includes, for example, a scanning laser exposure device, and forms a latent image on the photosensitive member 28 across a process cartridge 46 described later. The optical writing device 32 may use an LED or a surface emitting laser as another embodiment.

  Of the members constituting the image forming unit 14, the photosensitive member 28, the charging device 30, the developing device 34, and the cleaning device 38 are integrated as a process cartridge 46 and can be exchanged.

  The sheet supply devices 18 and 18 include, for example, sheet storage units 19 and 19 formed of a sheet feeding cassette, pickup rolls 20 and 20 for picking up the uppermost sheet stored in the sheet storage unit, and pickup rolls 20 and 20 for pickup. Feed sheets 21 and 21 for conveying the formed sheets are respectively supplied, and the sheets stored in a stacked state in the sheet storage portions 19 and 19 are respectively supplied to the image forming means 14 described above.

  A registration roll 22 is provided downstream of the feed roll 21 in the sheet conveying direction, the transfer device 36 and the photosensitive member 28 of the process cartridge 46 are provided on the downstream side of the registration roll 22, and further on the downstream side. The above-described fixing device 40 is provided.

  2 and 3 show the drive transmission device 50. The drive transmission device 50 is a device that receives a driving force from a motor 52 used as a driving source and outputs the driving force to the photosensitive member 28, and includes a rotating body 54.

  The rotating body 54 is supported by the hollow cylindrical portion 56, a protruding portion 58 protruding from the cylindrical portion 56 in a direction substantially perpendicular to the longitudinal direction of the cylindrical portion 56, and having a larger diameter than the cylindrical portion 56. And an outer diameter portion 60 having a cylindrical shape. A convex portion 64 formed on a main body frame 62 used as a first support member is inserted into one end side of the cylindrical portion 56, and one end side of the cylindrical portion 56 is rotatably supported by the convex portion 64. . The other end side of the cylindrical portion 56 is inserted into an insertion hole 68 formed in a main body frame 66 used as a second support member, and the other end side of the cylindrical portion 56 is rotatably supported by the insertion hole 68. Has been.

  The cylindrical portion 56 is inserted into the insertion hole 68, and has an insertion portion 70 having an outer diameter substantially the same diameter as the insertion hole 68, and is positioned closer to the main body frame 62 than the insertion portion 70 and has a larger diameter than the insertion hole 68. A step surface 74 is formed between the insertion portion 70 and the large diameter portion 72 in a direction substantially perpendicular to the rotation axis direction of the rotating body 54. The step surface 74 and the main body frame 66 are used as restricting means for restricting movement of the rotating body 54 in the axial direction. That is, when the step surface 74 abuts on the main body frame 66, the movement of the rotating body 54 in the right direction in FIGS. 2 and 3 is restricted. Since the rotation body 54 is also restricted from moving leftward by the main body frame 62, it does not move from the main body frames 62 and 66 in the axial direction.

  A shaft 76 of the photoreceptor 28 is connected to the main body frame 66 side of the cylindrical portion 56 by a method such as press fitting. Instead of press-fitting the shaft 76, for example, a spiral rib is formed on the shaft 76, a spiral groove is formed on the inner diameter portion of the cylindrical portion 56, and the rotating body 54 and the photosensitive member are photosensitized by engaging the spiral rib and the spiral groove. The body 28 may be connected.

  A gear train 78 is formed on the outer peripheral surface of the outer diameter portion 60. A gear 80 is provided so as to mesh with the gear train 78. The gear 80 is rotatably supported by the main body frame 62 and the main body frame 66 using a shaft 82, and is connected to the motor 52 using the shaft 82. Therefore, the driving force from the motor 52 is input to the gear 80 via the shaft 82, the driving force is input from the gear 80 to the rotating body 54, and the rotating body 54 to which the driving force is input rotates together with the photosensitive member 28. .

  A felt washer 84 used as an impact absorbing member is provided at the interface between the stepped surface 74 and the surface of the main body frame 66 facing the main body frame 62. The felt washer 84 is made of felt, which is an elastic body, and has a hole having a slightly larger diameter than the insertion portion 70. The stepped surface 74 and the main body frame 66 are inserted into the hole so that the insertion portion 70 is inserted into the hole. And is supported by the interface. The felt washer 84 absorbs an impact that may be caused by the rotation of the rotating body 54, so that, for example, rotation failure such as stick-slip is less likely to occur, and the rotating body 54 rotates better. Become.

  A nylon washer 86 used as a friction coefficient reducing member is provided along with the felt washer 84 at the interface between the stepped surface 74 and the surface of the main body frame 66 facing the main body frame 62. The nylon washer 86 is made of nylon, which is a material having a lower coefficient of friction than the stepped surface 74 and the main body frame 66, and has a slightly larger diameter hole than the insertion portion 70. The insertion portion 70 is inserted into the hole and supported by the interface between the step surface 74 and the main body frame 66. By providing the nylon washer 86, the frictional force received when the stepped surface 74 of the rotating body 54 rotates can be reduced. For example, rotation failure such as stick slip is less likely to occur. Rotates well.

  As described above, the present invention includes a drive transmission device having, for example, a gear, a drive device having such a drive transmission device and a drive source such as a motor, and a copy machine having such a drive device, such as a copier, The present invention can be applied to image forming apparatuses such as facsimiles and printers.

1 is a front view showing an outline of an image forming apparatus according to an embodiment of the present invention. It is sectional drawing which shows the drive transmission apparatus used for embodiment of this invention. It is sectional drawing which expands and shows the principal part of the drive transmission apparatus used for embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 28 Photoconductor 50 Drive transmission device 52 Motor 54 Rotor 56 Cylindrical part 58 Projection part 60 Outer diameter part 62 Main body frame 64 Protrusion part 66 Main body frame 68 Insertion hole 70 Insertion part 72 Large diameter part 74 Step surface 84 Felt Washer 86 Nylon washer

Claims (4)

A first rotating body capable of connecting the second rotating body;
A first support comprising a main body frame, wherein a convex portion inserted into one end side of the first rotating body is formed integrally with the main body frame, and rotatably supports one end side of the first rotating body. Members,
An insertion hole into which the other end side of the first rotating body is inserted, and a second support member that rotatably supports the other end side of the first rotating body;
An impact absorbing member that absorbs an impact caused by the rotation of the first rotating body;
A friction coefficient reducing member that reduces a friction coefficient between the first rotating body and the second support member;
Have
The first rotating body includes:
A hollow cylindrical portion;
Inserted into the insertion hole, and an insertion portion having substantially the same diameter as the insertion hole;
Located on the first support member side of the insertion portion, a large diameter portion larger in diameter than the insertion hole,
A step surface formed between the insertion portion and the large diameter portion in a direction substantially perpendicular to the rotation axis direction;
Have
The impact absorbing member and the friction coefficient reducing member are arranged such that the impact absorbing member contacts the second support member between the step surface and the second support member, and the friction coefficient reducing member is the first friction member. 1 is provided so as to be in contact with the rotating body,
A spiral groove is formed in the cylindrical portion, and a spiral rib formed on a shaft of the second rotating body is meshed with the spiral groove so that the first rotating body has the second groove. The rotating bodies are connected ,
The step surface can contact the second support member, and the movement of the first rotating body in the rotation axis direction is restricted by the second support member. Drive transmission device. The first rotating body, the drive transmission device according to claim 1, wherein the gear train is formed. The drive transmission device according to claim 1 or 2 ,
A drive source for inputting a drive force to the drive transmission device;
A drive device comprising: A drive device according to claim 3 ;
A driving force is output from the driving device, and an image forming related member used for image formation or sheet conveyance;
An image forming apparatus comprising:

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