JP5870599B2 - Driving device and image forming apparatus - Google Patents

Description

  The present invention relates to a drive device provided with an electromagnetic clutch and an image forming apparatus using the drive device.

  FIG. 8 is a cross-sectional view conceptually showing the overall structure of an example of an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine having two or more of these functions. The image forming apparatus according to the present embodiment mainly includes a reading unit 111 that reads a document, an image forming unit 112 that forms an image, an automatic document feeder (ADF) 113, and a document discharge tray that stacks documents sent from the ADF 113. 114, a paper feed unit 119 including paper feed cassettes 115 to 118, and a paper discharge unit (discharge tray 120) for stacking recording paper.

  In this apparatus, when the document D is set on the document table 121 of the ADF 113 and an operation on an operation unit (not shown), for example, a press operation of a print key is performed, the uppermost document D is rotated in the direction of arrow B 1 by the rotation of the pickup roller 122. And is fed onto the contact glass 124 fixed to the image reading unit 111 by the rotation of the document conveying belt 123, and stops there. The image of the document D placed on the contact glass 124 is read by a reading device 125 positioned between the image forming unit 112 and the contact glass 124. The reading device 125 includes a light source 126 that illuminates the document D on the contact glass 124, an optical system 127 that forms an image of the document, a photoelectric conversion element 128 that includes a CCD that forms an image of the document, and the like. After the image reading is completed, the document D is transported in the direction of arrow B2 by the rotation of the document transport belt 123 and discharged onto the document discharge tray 114. In this way, the document D is fed one by one onto the contact glass 124 and the document image is read by the image reading unit 111.

  On the other hand, inside the image forming unit 112, a photoreceptor 130 as an image carrier is disposed. The photoconductor 130 is driven to rotate clockwise in the drawing, and the charging device 131 charges the surface to a predetermined potential. Further, the writing unit 132 emits a laser beam L that is light-modulated in accordance with image information read by the reading device 125, and the surface of the charged photoreceptor 130 is exposed with the laser beam L. An electrostatic latent image is formed on the surface of the body 130. When the electrostatic latent image passes through the developing device 133, the electrostatic latent image is transferred to the recording material P fed between the photosensitive member 130 and the transfer device 134 by the opposing transfer device 134. The surface of the photoreceptor 130 after the toner image transfer is cleaned by a cleaning device 135.

  A plurality of paper feed cassettes 115 to 118 arranged at the lower part of the image forming unit 112 contain recording material P such as paper, and the recording material P is fed from any of the paper feed cassettes 115 to 118 in the direction of arrow B3. The toner image formed on the surface of the photoreceptor 130 as described above is transferred onto the surface of the recording material P. Next, the recording material P is passed through the fixing device 140 in the image forming unit 112 as indicated by an arrow B4, and the toner image transferred onto the surface of the recording material P by the action of heat and pressure is fixed. The recording material P that has passed through 136 is conveyed by the discharge roller pair 137, discharged to the discharge tray 120 as shown by an arrow B5, and stacked.

  In such an image forming apparatus, a drive device provided with an electromagnetic clutch is used to drive various components. However, in such a drive device, an anti-rotation of the electromagnetic clutch and a rotation restricting member on the side to be attached are provided. As a method of reducing the collision noise, a technique is known in which an elastic member is formed between the regulating member and the rotation stopper to reduce the collision noise.

  Patent Document 1 discloses a method of restricting movement in the thrust direction using an elastic member for the purpose of reducing collision noise generated during operation of an electromagnetic clutch.

FIG. 1 is a diagram for explaining a configuration in which a collision sound between a clutch rotation stopper and a rotation restricting member is generated during operation of an electromagnetic clutch. In the example of FIG. 1, power is transmitted to the electromagnetic clutch 1 held by the gear holder 5 by the input gear 6 held by the input gear shaft 7. When the electromagnetic clutch 1 is in operation, power is sent to the clutch output shaft 4. Communicated. At the time of transmission, the electromagnetic clutch 1 itself tries to rotate, but the rotation of the electromagnetic clutch 1 is restricted by contact between the rotation restricting member 3 and the rotation stopper 2 formed on the electromagnetic clutch 1. At this time, a collision sound between the rotation restricting member 3 and the rotation stopper 2 is generated.

Figure 2 is a diagram for explaining a conventional configuration of the reduced rotation restricting member and the detent Me collision sound. In the example of FIG. 2, an elastic member 8 is configured between the rotation restricting member 3 and the rotation stopper 2 to reduce the collision noise between the rotation restricting member 3 and the rotation stopper 2.

  However, the technique using an elastic member has a problem that the device configuration becomes complicated and the cost increases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the collision noise between the rotation stop of the electromagnetic clutch and the rotation restricting member without using a special configuration.

  The drive device according to the present invention includes an electromagnetic clutch, a rotation stopper attached to the electromagnetic clutch, a rotation restricting member that restricts rotation of the electromagnetic clutch, and a movement of the rotation stopper in the thrust direction to the electromagnetic clutch. A first thrust restricting member for restricting from the surface side; and a second thrust restricting member for restricting the movement of the rotation stop in the thrust direction from the side opposite to the attachment surface to the electromagnetic clutch. It is possible to hold the rotation stopper between two thrust restricting members.

  According to the present invention, it is possible to reduce the collision noise between the rotation stop of the electromagnetic clutch and the rotation restricting member without using a special configuration.

The figure which shows the structure which the collision sound of a clutch rotation stop and a rotation control member generate | occur | produces at the time of electromagnetic clutch operation | movement. The figure which shows the conventional structure which reduces the collision sound of a rotation control member and a rotation stopper The figure which shows the structure of Embodiment 1 of this invention. The figure which shows the structure of Embodiment 2 of this invention. The figure which shows the structure of Embodiment 3 of this invention. The figure which shows the structure of Embodiment 4 of this invention. The figure which shows the structure of Embodiment 5 of this invention. The figure which shows the structure of an example of an image forming apparatus

  In the drive device according to the embodiment of the present invention, the main body of the electromagnetic clutch tends to rotate in addition to the power transmission unit during the operation of the electromagnetic clutch. The rotation stopper configured in the electromagnetic clutch is sandwiched in the thrust direction to restrict rotation of the rotation stopper. Thereby, the collision between the rotation stop of the electromagnetic clutch and the rotation restricting member is reduced. From this, since the collision noise when the rotation stop of the electromagnetic clutch collides with the rotation restricting member is reduced, the rotation noise of the electromagnetic clutch and the collision noise of the rotation restriction member are reduced without using a special configuration.

  That is, in the embodiment of the present invention, when the electromagnetic clutch is operated, the main body of the electromagnetic clutch is going to rotate in addition to the power transmission unit. Therefore, the detent provided on the electromagnetic clutch is thrust by the first and second thrust regulating members. It is pinched in the direction and restricts rotation of the detent. Thereby, the collision between the rotation stop of the electromagnetic clutch and the rotation restricting member is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 3 is a diagram for explaining a configuration for reducing the collision noise between the rotation restricting member and the detent according to the embodiment of the present invention. In Figure 3, jamming times Ri stop 2 of the electromagnetic clutch 1 includes a first detent thrust regulating member 9 by the second rotation stop thrust regulating member 10 to regulate the position. The first rotation stop thrust restricting member 9 is attached to the rotation restricting member 3. The second rotation stop thrust restricting member 10 is attached to the gear holder 5 .

Power is transmitted to the electromagnetic clutch 1 held in the gear holder 5 by the input gear 6 held on the input gear shaft 7 , and power is transmitted to the clutch output shaft 4 when the electromagnetic clutch 1 is operating.

At the time of power transmission, the electromagnetic clutch 1 itself tries to rotate, but the rotation stopper 2 does not rotate because it is sandwiched between the first rotation stop thrust restricting member 9 and the second rotation stop thrust restricting member 10 and rotates. It does not collide with the regulating member 3. This is, without using additional components, reducing the rotation restricting member 3 and rotating Ri of the set 2 collision sound generated during operation of the electromagnetic clutch 1.

<Embodiment 2>
As shown in FIG. 4, the first anti-rotation thrust restricting member 9 and the second anti-rotation thrust restricting member 10 may be fixed with screws 11. Thereby, the rotation stopper 2 can be reliably regulated in the thrust direction.

<Embodiment 3>
Further, as shown in FIG. 5, the second anti-rotation thrust restricting member 10 may be configured as an exterior material. Thereby, the freedom degree of design layout can be increased.

<Embodiment 4>
Further, as shown in FIG. 6, the second anti-rotation thrust restricting member 10 is configured to restrict the outer side of the anti-rotation 2 (radial direction: left and right in the figure) relative to the first anti-rotation thrust restricting member 9. Yes. Thereby, the precision of the thrust control members 9 and 10 can be eased.

<Embodiment 5>
Further, as shown in FIG. 7, the first anti-rotation thrust restricting member 9 and the second anti-rotation thrust restricting member 10 are configured to have a spring property, and the accuracy of the member restricting the anti-rotation is eased. can do. In the illustrated example, the tip portions of the regulating members 9 and 10 that are in contact with the rotation stopper 2 have a shape that exhibits elasticity as a cross-sectional shape in which the side in contact with the rotation stopper 2 is tapered.

  The present invention is not limited to the embodiments described above, and many variations are possible by those having ordinary knowledge in the art within the technical idea of the present invention.

1: Electromagnetic clutch 3: Rotation restricting member 4: Clutch output shaft
5 : Gear holder
6 : Input gear
7 : Input gear shaft 9, 10: Thrust restricting member 11: Screw

JP 2001-336547 A

Claims (8)

An electromagnetic clutch,
A rotation stopper attached to the electromagnetic clutch;
A rotation restricting member for restricting rotation of the electromagnetic clutch;
A first thrust restricting member for restricting the movement of the rotation stop in the thrust direction from the mounting surface side to the electromagnetic clutch;
A second thrust restricting member for restricting the movement of the rotation stop in the thrust direction from the side opposite to the attachment surface to the electromagnetic clutch;
A driving apparatus characterized in that the first and second thrust regulating members can be held with the rotation stopper interposed therebetween.   The drive device according to claim 1, wherein the rotation stopper is made of an elastic member.   The drive device according to claim 1, wherein the first and second thrust regulating members are made of an elastic member. The drive device according to any one of claims 1 to 3, wherein the first and second thrust regulating members are fixed with screws . The first drive device according to any one of claims 1 to 3 in which the second thrust limiting member, characterized in that an exterior member of the electromagnetic clutch. The second thrust limiting member, according to any one of claims 1 to 5, characterized that you restrict rotation of the electromagnetic clutch on the outside of said rotation stopper than the first thrust limiting member Drive device. Said first, second thrust limiting member, the driving device according to any one of claims 1, wherein the member der Rukoto shape having spring property 6. An image forming apparatus using the drive device according to claim 1 and comprising at least an image forming unit.