JPH0530857U - Photosensitive drum connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] With regard to the connection structure of the photosensitive drums in the electrophotographic recording apparatus, it is intended to reduce the number of parts and save space. A pulley for transmitting a rotational force of a motor to a rotary shaft and a female coupling provided at a rotation center of the pulley and coupled to a male coupling of the rotary shaft are integrally provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a photosensitive drum connecting structure in an electrophotographic recording apparatus. Electrophotographic recording devices capable of recording high quality images on plain paper are often used in facsimile machines, copiers and the like.

An electrophotographic recording apparatus uses a photosensitive drum having a relatively short life and has a replaceable structure.

[0003]

[Prior Art]

 As shown in the side view of FIG. 4, the electrophotographic recording apparatus to which the present invention is applied includes a photosensitive drum 1 having a photosensitive layer whose surface changes its conductivity in response to light, and a surface of the photosensitive drum 1. Developing device 2 for adhering toner to the surface of the drum by the electric potential difference, a charging device 3 for uniformly charging the surface of the photosensitive drum 1, and changing the amount of charge on the photosensitive drum 1 by scanning the laser beam to cause static electricity. An optical system 4 for forming an electric latent image, a transfer unit 6 for transferring the toner image on the photosensitive drum 1 onto the paper 5, a fixing unit 7 for heating and fixing the toner image transferred onto the paper 5, and the like. ing.

The photosensitive drum 1 has a relatively short life, and has a connecting structure as shown in a partially enlarged side view of FIG. 5 and can be replaced. That is, a pulley 8 for transmitting the rotational force of a motor (not shown) to the photosensitive drum 1, a rotary shaft 9 fixed at the center of rotation of the pulley 8, and a rotary shaft 9 rotatably through a bearing 10. Rotation of the photosensitive drum 1 having a female coupling 13a fixed to the rotating shaft 9 protruding from the supporting frame 11 with a set screw 12 and a male coupling 13b coupled to the female coupling 13a. And the shaft 14.

The connecting portion between the female side coupling 13a and the male side coupling 13b is the outer side portion of the male side coupling 13b in which a plurality of claws 15 projecting inside the female side coupling 13a are, for example, elliptical. Engage with.

In the figure, 16 is a coil spring for pressing the male side coupling 13b against the female side coupling 13a.

[0007]

[Problems to be solved by the device]

 The photosensitive drum has the connecting structure as described above, but the pulley 8 and the female coupling 13a are fixed via the rotary shaft 9, and the number of parts is large and many man-hours are required for assembly.

Further, there is a problem that the female side coupling 13a projects from the frame 11 to the photosensitive drum 1 side, and the space is wasted. The present invention aims to reduce the number of parts and save space.

[0009]

[Means for Solving the Problems]

 In the present invention, as shown in the side view of FIG. 1, a pulley 17 for transmitting the rotational force of a motor to a rotary shaft 14 and a male coupling 13b of the rotary shaft 14 provided at the center of rotation of the pulley 17 are coupled. The female side coupling 13c is integrally provided.

[0010]

[Action]

 By integrating the female side coupling with the pulley, for example, plastic molding can be integrally formed, and the number of parts and the number of assembling steps can be reduced.

Further, by this, the protrusion of the female side coupling is eliminated, and the space can be effectively utilized.

[0012]

【Example】

 In the present invention, as shown in the side view of FIG. 1, a pulley 17 for transmitting the rotational force of the motor to the rotary shaft 14 of the photosensitive drum 1, and a male coupling of the rotary shaft 14 provided at the center of rotation of the pulley 17. It is integrally provided with a female side coupling 13c which is coupled with 13b.

As shown in the perspective view of FIG. 2, by integrally forming the female side coupling 13c and the pulley 17, for example, both can be integrally formed by using a plastic mold, and the rotary shaft and the stopper can be integrally formed. It is possible to reduce the number of parts such as screws and the number of assembly steps.

The side view of FIG. 3 shows a state in which the male side coupling 13b and the female side coupling 13c are coupled, but the female side coupling 13c does not project from the frame 11. Therefore, the space can be effectively used, and the device can be downsized.

[0015]

[Effect of the device]

 According to the present invention, the number of parts and the number of assembling steps can be reduced, and the space can be saved.

[Brief description of drawings]

FIG. 1 is a side view of a photosensitive drum connection structure of the present invention,

FIG. 2 is a perspective view showing a state in which a female coupling and a pulley are integrated with each other,

FIG. 3 is a side view showing a connection state of the photosensitive drum connection structure of the present invention,

FIG. 4 is a side view of an electrophotographic recording device to which the present invention is applied,

FIG. 5 is a side view of a conventional photosensitive drum connection structure,

[Explanation of symbols]

 1 photosensitive drum, 11 frame, 13b male coupling, 13c female coupling, 14 rotating shaft, 17 pulley,

Claims (1)

[Scope of utility model registration request] 1. A pulley (17) for transmitting a rotational force of a motor to a rotary shaft (14), and a male side coupling (13b) of the rotary shaft (14) provided at a rotation center of the pulley (17). Female side coupling (1
3c) is integrally provided with a photosensitive drum connection structure.