JP4353832B2 - Roller bearing support device - Google Patents

Description

  The present invention relates to a roller bearing support device that supports a roller having one rotating shaft by three bearing portions.

Some copiers, developing devices, and the like drive some of the rollers by another drive system in order to simplify the structure of the drive system and to reduce jitter and improve image quality.
In this type of technology, in order to drive the roller shaft at an accurate timing, for example, there is one in which a drive motor is directly connected to the roller shaft to configure a drive system (see Patent Document 1).

JP-A-06-156696

However, since the configuration of Patent Document 1 directly connects the drive motor to the roller shaft, there is a problem that vibration of the drive motor is transmitted to the roller and the main body. In particular, in the case of a registration roller installed immediately before a transfer unit of a copying machine or the like, if a drive motor is directly connected, vibration of the drive motor is transmitted and image quality is degraded.
Further, since the roller shaft is fixedly supported at three points, there is a problem in that the roller shaft may be rolled and torque unevenness may occur unless sufficient mounting accuracy is obtained. In order to avoid the roller shaft from curling, there is a problem in that it is necessary to install the bearing with high accuracy, and considerable effort is required to assemble the apparatus.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a roller bearing support device capable of improving the image quality by reducing vibration transmission from a drive motor and enhancing the noise reduction effect. In the point.

[Characteristic configuration 1]
In order to achieve this object, according to the present invention, a first feature configuration of a roller bearing support device that rotatably supports a drive roller having one rotation shaft on a main body portion by three bearing portions in an image forming apparatus , A main body portion for fixing a first bearing portion supporting one end side of the rotating shaft of the drive roller and a second bearing portion supporting an intermediate portion near the other end side of the rotating shaft, and the other end side of the rotating shaft. A support member configured to support a third bearing portion to be supported and a drive motor that rotationally drives the rotating shaft and configured separately from the main body portion, and a main body side mounting member that attaches the support member to the main body portion. the support member, the relative body-side mounting member be movable in a radial direction of the drive roller, in that it is held so as not detached from the body-side mounting member in the axial direction of said drive roller .

The axial direction here is a direction along the axis of the roller.
That is, according to the first characteristic configuration, since the support member is configured separately from the main body portion, vibration from the drive motor can be prevented from being directly transmitted to the main body portion and the roller, and the image quality can be improved. Decline can be prevented. Furthermore, the drive motor can be mounted with sufficient accuracy, and assembly is facilitated.
And since a 3rd bearing part and a motor attachment part are provided in a support member, the positional relationship of a 3rd bearing part and a motor attachment part is set only by the shape of a support member. As a result, the gear pitch between the third bearing portion and the motor mounting portion can be reliably ensured, and the assembly of the roller bearing support device according to the present invention is facilitated.
Further, by configuring the support member to be movable in the radial direction, the third bearing portion can move with respect to the first bearing portion and the second bearing portion, and stress that causes deformation of the roller is generated. Can be prevented. As a result, the torque irregularity of the roller can be eliminated and the deterioration of the image quality can be prevented.

[Characteristic configuration 2]
The second characteristic configuration is that the support member is provided with an elastic member using a low repulsive material on a surface in contact with the main body side mounting member .
That is, according to the second characteristic configuration, since the elastic member using the low resilience material is provided, the transmission of vibration from the drive motor to the roller can be more effectively suppressed, and the silent effect can be enhanced. .

Embodiments of a roller bearing support device according to the present invention (hereinafter abbreviated as “the present device” as appropriate) will be described below with reference to the drawings.
FIG. 1 shows a copying machine 2 to which a roller bearing support device 1 according to the present invention is applied. The copying machine 2 is provided with a drive motor 10 so as to drive the registration roller 3 with an independent drive system in order to improve image quality. The registration roller 3 is configured to be supported at three points including two points on the side surface of the main body 4. The device 1 of the present invention is applied to the registration roller 3.

  A first embodiment of the device of the present invention will be described with reference to FIGS. Here, FIG. 2 shows a configuration of the main body 4 in a state where the device 1 of the present invention is attached. FIG. 3 shows the configuration of each of the support member 7, the main body side mounting member 8, the third bearing portion 9, and the drive motor 10 of the device 1 of the present invention. FIG. 4 shows a state in which these members are assembled. Show.

  As shown in FIG. 2, the main body 4 includes a first bearing 5 that supports one end of the rotating shaft 3a of the registration roller 3 and a second bearing 6 that supports an intermediate portion near the other end of the rotating shaft 3a. It has. The first bearing portion 5 and the second bearing portion 6 are configured by fitting a bearing member into a hole formed in the side surface of the main body portion 4. The first bearing portion 5 is installed on the side surface of the main body portion 4, and the second bearing portion 6 is installed on the side surface facing the side surface of the main body portion 4 provided with the first bearing portion 5. Are arranged so as to be held substantially horizontally. On the outer side surface of the main body portion 4 on which the second bearing portion 6 is installed, a main body side mounting member 8 configured to engage the support member 7 is fixed with screws or the like.

  The support member 7 is composed of a plate-like member, and includes a third bearing portion 9 that supports the other end side of the rotary shaft 3a, and a motor attachment portion 11 that mounts a drive motor 10 that rotationally drives the rotary shaft 3a. The main body 4 and the main body side mounting member 8 are configured separately. The third bearing portion 9 here is configured by inserting the bearing 9 a into the bearing hole 7 a formed in the support member 7. The motor mounting portion 11 includes a screw fixing portion 11 a for inserting a screw for fixing the drive motor 10 to the support member 7 and a motor shaft hole 11 b for inserting the motor shaft 10 b of the drive motor 10.

  The drive motor 10 is a stepping motor, and is configured to rotationally drive the rotary shaft 3 a via the motor gear 12 and the roller gear 13. A motor gear 12 is provided on the motor shaft 10 b of the drive motor 10, and is configured to mesh with a roller gear 13 installed on the rotation shaft 3 a of the registration roller 3. In addition, since the 3rd bearing part 9 and the drive motor 10 are all installed in the support member 7, a gear pitch can be ensured and the motor gear 12 and the roller gear 13 can be meshed | engaged favorably. Further, the drive motor 10 is provided with two screw fixing portions 10a through which screws for fixing to the support member 7 are inserted.

  The body side mounting member 8 is formed so as to surround the installation space of the motor gear 12 and the roller gear 13. Further, the outer side surface is formed in a flat shape, and the support member 7 can move in the radial direction of the registration roller 3 with respect to the main body 4, and does not separate from the main body 4 in the axial direction of the registration roller 3. So that it is held.

  Claws 14a, 14b, and 14c for holding the support member 7 are formed on the outer side surface of the main body side mounting member 8 at three locations, two on the upper side and one on the lower side. The nail | claw 14 cuts and raises the side surface of the main body side attachment member 8 toward the outer side so that a cross section may become a substantially L shape. Further, the claw 14 holds the support member 7 so as not to be detached from the side surface of the main body side attachment member 8 in the axial direction of the rotary shaft 3a. However, the distance between the claw 14 and the side surface of the main body side attachment member 8 is such that the support member 7 does not hinder the movement of the support member 7 so that the support member 7 can move in the radial direction of the registration roller 3 with respect to the main body portion 4. Set to width. With respect to the installation interval of the upper and lower claws 14, the interval between the base portions connected to the main body side mounting member 8 of the claws 14 is supported so that the support member 7 can move in the radial direction of the registration roller 3 with respect to the main body portion 4. It is set wider than the vertical width of the member 7. Further, the distance between the tip portions formed by being bent with respect to the base portion of the claw 14 is larger than the vertical width of the support member 7 so that the support member 7 can be held so as not to be detached in the axial direction of the registration roller 3. Set narrower.

  Further, the main body side mounting member 8 is provided with a hole 8a through which the motor shaft 10b and the rotary shaft 3a are inserted at positions corresponding to the motor shaft hole 11b and the third bearing portion 9 of the support member 7. The hole 8a is preferably formed sufficiently larger than the bearing hole 7a and the motor shaft hole 11b so as not to hinder the movement of the support member 7. In this embodiment, since the support member 7 is configured to be movable in the radial direction of the rotation shaft 3a with respect to the main body portion 4, the third bearing portion 9 is movable with respect to the main body portion 4, so that the registration roller 3 is deformed. There is no possibility of generating such stress. Accordingly, since the third bearing portion 9 can be installed regardless of the positional accuracy of the drilling process, the positioning of the third bearing portion 9 with respect to the first bearing portion 5 and the second bearing portion 6 is facilitated.

  In the present embodiment, the claw 14 is provided at three positions on the main body side mounting member 8. However, the number of the support members 7 that can be favorably supported according to the size of the support member 7, the size of the drive motor 10, or the like. Arrange appropriately. Further, the number of screws used for fixing the drive motor 10 is set to a number that can fix the drive motor 10 satisfactorily.

Next, a second embodiment of the device of the present invention will be described.
The support member 7 of the present embodiment is provided with an elastic member 15 on the surface that contacts the main body side mounting member 8. Since this elastic member 15 is excellent in silent performance and shock absorption performance, a low resilience material such as poron (high density polyurethane) is used. The elastic member 15 is formed in conformity with the contour shape of the support member 7 and is affixed to the surface of the support member 7 that contacts the body-side mounting member 8 with a double-sided tape or an adhesive. Providing the elastic member 15 makes it difficult for vibration of the drive motor 10 to be transmitted by the body-side mounting member 8 due to its shock absorption, and further improves silence.

The perspective view of the internal structure of the copying machine to which the roller bearing support device according to the present invention is applied Sectional drawing of the roller bearing support device which concerns on this invention The exploded perspective view of the roller bearing support device concerning the present invention The perspective view of the roller bearing support device concerning the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller bearing support apparatus 2 Copier 3 Registration roller 4 Main body part 5 First bearing part 6 Second bearing part 7 Support member 8 Main body side attachment member 9 Third bearing part 10 Drive motor 11 Motor attachment part 12 Motor gear 13 Roller gear 14 Claw 15 Elastic member

Claims (2)

A roller bearing support device that rotatably supports a driving roller having one rotating shaft in an image forming apparatus on a main body by three bearings,
A main body portion that fixes a first bearing portion that supports one end side of the rotating shaft of the drive roller and a second bearing portion that supports an intermediate portion near the other end side of the rotating shaft;
A third bearing portion and supports a driving motor for rotating the rotary shaft, the support member constituted by the main body and the separate body for supporting the other end of the rotary shaft,
A main body side mounting member for mounting the support member to the main body ,
Said support member, said relative body-side mounting member be movable in a radial direction of the drive roller, the drive roller roller bearing support device is held so as to axially without departing from the body-side mounting member . The roller bearing support device according to claim 1, wherein the support member is provided with an elastic member using a low resilience material on a surface in contact with the main body side mounting member .

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