JPS59228281A - Photosensitive body driving device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To eliminate mesh inbalance due to the deficit of a pawl at the attachment and detachment of a photosensitive body and obtain a copy of good quality by sticking a buffer member to the contacting surface of the pawl body of a coupling provided to the rotating shaft of a driving roll. CONSTITUTION:One side 15a of the coupling 15 is fitted to one terminal side of the rotating shaft of a roll 2 which drives the photosensitive body, and the other 15b is engaged with the pawls 15c; and the buffer member 20 of an elastic body is provided to the contacting surface 15d of the pawl 15c to transmit the power of a driving system 19. Therefore, even if the pawls 15c are out of phase during the attachment and detachment of the photosensitive body, the collision between the pawls 15c is relieved to eliminate the deficit of a pawl 15c, and variation in the speed of the photosensitive body and eccentric motion due to the mesh unbalance are eliminated, so that a copy of invariably good quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a photoconductor driving device for an electronic copying machine using a belt-shaped photoconductor.

Prior Art Conventionally, as a photoconductor drive device for an electronic copying machine that uses a belt-shaped photoconductor, a claw coupling is provided between the drive system and the drive roll so that the photoconductor can be easily separated from the drive system when attaching and detaching the photoconductor. Something like this is publicly known. However, with the above-mentioned conventional drive device, when the photoreceptor is attached or removed, a part of the pawl coupling may break off, or the rotational speed of the belt-shaped photoreceptor may change or it may move eccentrically due to imbalance in the engagement of the pawl coupling. As a result, there were problems such as a decrease in the surface quality of the resulting copies.

Purpose of the Invention The present invention was made with the aim of improving such problems, such as when a part of the coupling is damaged when the photoreceptor is attached or detached, or
To provide a photoreceptor drive device for an electronic copying machine that does not cause imbalance in meshing, so that high-quality copies can always be obtained.

Constituent Structure of the Invention A buffer member made of an elastic body is provided at the contact portion of one of the claws of the coupling provided between the rotation shaft of the drive roll that rotates the belt-shaped photoreceptor and the drive system, and this buffer member prevents the meshing. A photoreceptor drive device for an electronic copying machine that corrects imbalance.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 denotes a belt-shaped photoreceptor, which is installed in a substantially triangular shape between a drive roll 2, a tension roll 3, and a developing opposing roll 40. A charger 5 for charging the surface of the photoreceptor 1, an exposure optical system 6 for exposing the surface of the photoreceptor 1, a developing device unit 7 at a position facing the opposite developing roll 4, and a developing device unit 7 for exposing the surface of the photoreceptor 1 to the periphery of the photoreceptor 1. Nearby are a paper feeding means 8, transfer and peeling corotrons 9 and 10, and a cleaning unit 1.
1 are installed in the above order along the rotation direction (arrow direction) of the photoreceptor 1.

On the other hand, the rotating shaft 12 of the drive roll 20 is rotatably supported by a bearing 13, and one end 15a of the coupling 15 is attached to one end of the rotating shaft 12. The coupling 15a is biased in the engagement direction by a compression spring 16 fitted into the rotating shaft 12, and the coupling 15 is connected to a drive motor 17 provided on the copying machine main body (not shown) The coupling +5b of the drive system 19, which is comprised of a chain 18 that transmits the rotation of the drive motor 17 to the other coupling +5b, is engaged in the direction of the arrow. Each of the couplings 15a and 15b has claws 15c that engage with each other, and the rotation of the drive system 19 is transmitted to the rotating shaft 12 of the drive roll 2 by engagement of the claws 15c. , the claw of the coupling 15a provided on the rotating shaft 12 side +
A buffer member 20 made of an elastic material such as a silicone comb is provided on the contact surface 15d with approximately the same thickness.

It should be noted that a plurality of the buffer members 20 are provided for each claw 15c, and are fixed to the claw 15c by adhesive or other means.

Effects of the Invention As described in detail above, the present invention allows the power of the drive system 19 to be
On the contact surface +5d of one of the claws 15c of the couplings 15a and 15b that transmit the photoreceptor I to the rotating drive roll 2,
A buffer member 20 made of an elastic body is provided.
The power is transmitted through the photoreceptor 1.
When attaching and detaching, use the claws 15c of each coupling 15a and 15b.
Even if the phases are shifted, the buffer member 20 prevents the claws 15c from colliding with each other, so there is no risk of damage such as the claws 15c being damaged. In addition, since the buffer member 20 interposed between the claws 15c of each coupling 15a + 15b absorbs the play that occurs between the claws 15c, speed changes and eccentric movements of the photoreceptor 1 caused by unbalanced engagement are eliminated. Reliability is further improved, such as by being able to consistently obtain high-quality copies.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an overall configuration diagram, FIG. 2 is an enlarged view of a coupling portion, and FIG. 3 is an enlarged view of the coupling. 1 is a belt-shaped photoreceptor, 12 is a rotating shaft, 15 is a coupling, +SC is a claw body, +5d is a contact surface, and 20 is a buffer member. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] In a device in which a belt-shaped photoreceptor 1 is rotated by a drive roll 2, the drive roll 20 rotation shaft 12 and drive system 19
Coupling 1 that can be detached and detached from photoreceptor 1 between 0 and 0
5 is provided, and the claw body 1 of one side 15a of this coupling 15 is provided.
A photoreceptor drive device for an electronic copying machine, which is provided with a buffer member 20 made of an elastic material on the contact surface 5c + 5d.