JPH0525453U - Photoconductor driving device for copier - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent misalignment of the photoconductor. [Structure] In addition to the drive shaft 2 of the photoconductor 1, the drive shaft 2
A rotation transmission shaft 10 for transmitting rotation to the drive shaft 2 is rotatably supported in a direction coaxial with (or a different holding direction), and only the rotation is transmitted between the rotation transmission shaft 10 and the drive shaft 2. A configuration in which the rotation transmission shaft 10 is connected by a coupling member 9 (or a flexible joint member) that does not transmit a minute displacement with respect to the drive shaft 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a photoconductor driving device for rotationally driving a photoconductor in an image forming apparatus of a copying machine, and more particularly, to improving a positional deviation of the photoconductor.

[0002]

[Prior Art]

 2. Description of the Related Art In recent years, in copiers, as the image quality and color are increased, the positional accuracy between the photoconductor and various units around the photoconductor is increasingly demanded. However, in the conventional photoconductor drive system in a copying machine, the position of the photoconductor is determined by the shaft supported by the side plate fixed to the main body side, and the rotational drive is transmitted. Has become easier.

For example, as shown in FIG. 5 as a first example, in the arrangement configuration of a conventional photoconductor, a drive shaft 2 is fixed as a rotation shaft of the photoconductor 1, and the drive shaft 2 is a rear plate 3 of the main body. And a drive shaft supporting member 4, and a drive pulley 5 around which a belt 6 is hung and a flywheel 7 are fixed to the outer parts thereof. In this structure, the photoconductor 1 is positioned by the drive shaft 2 and is rotationally driven.

As a second example, there is a type disclosed in Japanese Patent Application Laid-Open No. 61-148058. As shown in FIG. 6, in addition to the same structure as the first example, a photosensitive member positioning member 8 is fixed to the rear plate 3 of the main body, and the photosensitive member 1 has the photosensitive member positioning member 8 Positioned by

[0005]

[Problems to be solved by the device]

 However, in the first example of the above-described conventional photoconductor drive device, when the photoconductor 1 is rotationally driven, the drive pulley 5 is pulled by the belt 6 and the flywheel 7 is weighted by itself, so that the drive shaft 2, the main body There has been a problem that the rear plate 3 and the drive shaft support member 4 are bent, the center position of the drive shaft 2 is slightly displaced, and the photosensitive member 1 is displaced.

Further, in the second example described above, there is no problem of the displacement of the drive shaft 2 due to the drive pulley 5 and the flywheel 7 as in the first example, but the photoconductor positioning member 8 and the photoconductor 1 are not affected. However, there is a problem in that the contact point of No. 1 becomes worn, and the position of the photoconductor 1 is displaced over time. Further, in this case, there is a problem that it is difficult to obtain accuracy as compared with the case where positioning is performed by the drive shaft 2. Therefore, the present invention has an object to solve the above-mentioned conventional problems and provide a photoconductor driving device for a copying machine having a simple structure capable of preventing the displacement of the photoconductor.

[0007]

[Means for Solving the Problems]

 The gist of the present invention is that in a photoconductor drive device of a copying machine, which drives and rotates a photoconductor by a drive shaft rotatably supported by a side plate fixed to the body of the copier, the side plate Is rotatably supported by another support member, and a rotation transmission shaft for transmitting rotation to the drive shaft, and the position of the rotation transmission shaft is not restricted within a predetermined range with respect to the drive shaft. It transmits only the rotation of the shaft to the drive shaft, and is provided with a coupling member that connects these two shafts.

[0008]

[Action]

 Therefore, the rotation of the rotation transmission shaft is transmitted to the drive shaft via the coupling member, but this rotation transmission shaft may be displaced due to the relationship of the drive mechanism (the drive shaft is not provided with a drive mechanism). No displacement occurs because it has not been done). However, since this positional deviation is absorbed by the coupling member, the positional deviation is not transmitted to the drive shaft, which prevents the positional deviation from occurring on the photoconductor.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a drive shaft 2 is fixed to a photoconductor 1, and the drive shaft 2 is rotatably supported by a drive shaft support member 4 fixed to a rear plate 3 of the main body. On the other hand, a rotation transmission shaft 10 is rotatably supported by a support member 11 coaxially with the drive shaft 2, and a drive pulley 5 and a flywheel 7 on which a belt 6 is hung are fixed to the rotation transmission shaft 10. The end portion facing the drive shaft 2 is connected to the drive shaft 2 by the coupling member 9.

As shown in FIG. 2A, for example, the coupling member 9 is composed of a coupling receiving portion 9a which is fixed to the drive shaft 2 side and has a protruding portion 9c. The rotation is transmitted by hitting the protrusion 9b. Further, as shown in FIG. 3B, the coupling receiving portion 9a fixed to the drive shaft 2 side and having the convex portion 9c formed on the inner peripheral portion thereof and the concave groove 9b formed on the rotation transmitting shaft 10 are provided. It is also possible to adopt a configuration in which rotation is transmitted by fitting these. Alternatively, even if the drive shaft 2 and the rotation transmission shaft 10 are not in the coaxial direction and are, for example, in directions orthogonal to each other due to the arrangement space, as shown in FIG. It can also be configured to be connected via.

In the above structure, the rotation of the rotation transmission shaft 10 is transmitted to the drive shaft 2 via the coupling member 9 to rotate the photoconductor 1, but the drive pulley is pulled by the belt 6 and the flywheel 7 is rotated. Even if the rotation transmission shaft 10 is displaced due to its own weight, the coupling member 9 does not restrict the displacement of the rotation transmission shaft 10 within a predetermined range with respect to the drive shaft 2, so that the drive shaft 2 is not affected at all. Only the rotational movement of the rotation transmission shaft 10 is transmitted to the drive shaft 2 (without displacement of the drive shaft 2).

Next, another embodiment will be described with reference to FIG. 1 is similar to that of the embodiment of FIG. 1, except that the supporting member 11 of the rotation transmitting shaft 10 is cantilevered with respect to the rear side plate 3 of the main body. Space saving can be achieved as compared with the case of the above embodiment. In this case, the displacement of the rotation transmitting shaft 10 is larger than that of the embodiment shown in FIG. 1, but is only absorbed by the action of the coupling member 9 and is not a problem.

[0013]

[Effect of the device]

 As described above, according to the present invention, the rotation transmission shaft is provided separately from the drive shaft for rotating and positioning the photoconductor, and the positions of the drive transmission shaft and the rotation transmission shaft are regulated. Since it is connected with a coupling member that transmits only rotation without force, no force is applied to the drive shaft from a certain direction due to rotational drive, and displacement of the drive shaft (photoconductor) is prevented. can do.

[Brief description of drawings]

FIG. 1 is a sectional view of a photoconductor drive device according to an embodiment of the present invention.

FIG. 2A and FIG. 2B are perspective views showing an embodiment of a coupling member.

FIG. 3 is an explanatory view showing a joint member of another embodiment of the coupling member.

FIG. 4 is a sectional view of a photoconductor drive device according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional photoconductor driving device.

FIG. 6 is a cross-sectional view showing a conventional photoconductor driving device.

[Explanation of symbols]

 1 Photoreceptor 2 Drive Shaft 3 Side Plate 9 Coupling Member 10 Rotation Transmission Shaft 11 Supporting Member 20 Joint Member

Claims (2)

[Scope of utility model registration request] 1. A photoconductor driving device of a copying machine, wherein a drive shaft rotatably supported by a side plate fixed to a main body of a copying machine drives a photoconductor to rotate and position the photoconductor, and a supporting member different from the side plate. Rotatably supported by
A rotation transmission shaft for transmitting rotation to the drive shaft, and a position for restricting the position of the rotation transmission shaft within a predetermined range with respect to the drive shaft, and transmitting only rotation of the rotation transmission shaft to the drive shaft. A photoconductor driving device for a copying machine, comprising: a coupling member that connects two shafts. 2. The photoconductor drive device for a copying machine according to claim 1, wherein the coupling member is a joint member that is bendable and capable of transmitting rotation even when the directions of the drive shaft and the rotation transmitting shaft are different.