JPH0833694B2 - Photosensitive drum mounting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive drum mounting device for detachably mounting a photosensitive drum in an electrostatic transfer type electrophotographic copying machine on a support.

2. Description of the Related Art An example of a conventional photosensitive drum mounting device will be described below with reference to the drawings. FIG. 3 is a sectional view of an essential part of a photosensitive drum mounting portion of a conventional developing unit, and FIG. 4 is a view from the direction of the arrow C. In FIGS. 3 and 4, 1 is a rear side plate, 2 is a front side plate, 3 is a photosensitive drum, 4 is a drum flange, 5 is a drum shaft, 6 is a knob, 7 is a locking groove, 8 is a pressing plate, and 9 is a pressing plate. Is a fixing screw for the press plate, and 10 is a rotation fulcrum of the press plate.

The attachment / detachment of the photosensitive drum of the photosensitive drum mounting device configured as described above will be described. First, the fixing screw 9 for the press plate metal is removed, and the press plate 8 is rotated in the direction of the arrow D with the fulcrum portion 10 as the fulcrum, and is removed from the locking groove 7 of the drum shaft 5.
Next, holding the knob 6, the drum shaft 5 is pulled out, and the photosensitive drum 3 is attached and detached.

Problems to be Solved by the Invention However, in the configuration as described above, the photosensitive drum is
In general, a cylindrical drum having a photosensitive layer on its surface has a structure in which flanges on a disk having a central hole are fixed to both open ends of the drum. Becomes free to move. For this reason, the photosensitive drum is liable to come into contact with the developing unit main body when it is attached or detached, and is damaged or damaged, or the photosensitive surface is touched by the operator's hand. . Further, since the drum shaft 5 is inserted and removed by the entire length thereof, it takes time to attach and detach, and the workability in service is poor.

Further, since the drum shaft 5 is generally made of a stainless steel shaft, it has drawbacks such as heavy weight and high cost.

In view of the above problems, the present invention does not damage or damage the photosensitive drum when attaching or detaching the photosensitive drum, and moreover, the photosensitive drum can be replaced quickly and is lightweight,
A low-cost photosensitive drum mounting device is provided.

Means for Solving the Problems In order to solve the above problems, the present invention is directed to developing a photosensitive drum having a front plate and a rear plate, each of which is formed by fixing a flange having a cylindrical shaft portion at each opening of both ends of the photosensitive drum. In the photosensitive drum mounting device rotatably mounted to the unit, the front bearing member and the rear bearing member respectively rotate the photosensitive drum while inserting the bearing holes of the front plate and the rear plate while supporting the cylindrical shaft portion. The front and rear bearing members can be attached to and removed from the developing unit by attaching and detaching the front bearing member and the rear bearing member in the axial direction. A stopper member for locking the front bearing member and the rear bearing member at a predetermined position in the axial direction, and
The front bearing member and the rear bearing member have locking grooves that engage and disengage with the locking portions of the stopper member by rotation.

Effect of the Invention With the above-described structure, the photosensitive drum can be attached / detached by simply attaching / detaching the front bearing member and the rear bearing member without inserting / removing the long drum shaft. Therefore, the photosensitive drum is damaged or damaged. Instead, the drum replacement work can be performed quickly.

Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a sectional view of an essential part of a photosensitive drum mounting portion of a developing unit according to the present invention, and FIG. 2 is a view from the direction of the arrow A. In both figures, 11 is a rear plate, 12 is a front plate, 13 is a photosensitive drum, 14 is a drum flange, 15 is a front bearing member, 16 is a rear bearing member, 17 is a stopper member, 18 is a drum receiving portion, and 19 is a bearing. It is a locking groove of the member.

Regarding the photosensitive drum mounting device configured as described above,
The operation will be described below with reference to FIGS. 1 and 2.
First, when the photosensitive drum mounted as shown in FIG. 1 is removed, the front bearing member 15 and the rear bearing member 16 are moved to the second position.
The locking portion 19 is disengaged from the stopper member 17 by rotating about 90 ° in the direction of arrow B in the figure, and the front bearing member 15 and the rear bearing member 1
When 6 is pulled out in the axial direction of the photosensitive drum 13, the photosensitive drum 13
Rides on the drum receiver 18. Next, the photosensitive drum 13 is taken out while holding the flange portion 14. At the time of mounting, the above operation is performed in the reverse order. According to the above-described embodiments, when attaching and detaching the photosensitive drum, it is sufficient to attach and detach the short bearing member without inserting and removing the long drum shaft. Further, as for the fixing method, since the locking groove of the bearing member only needs to be rotated to align with the stopper member, the drum replacement work can be performed quickly without damaging or damaging the photosensitive drum.

EFFECTS OF THE INVENTION As described above, according to the present invention, the photosensitive drum formed by fixing the flanges having the cylindrical shaft portions to the opening portions at both ends of the photosensitive drum is rotatably attached to the developing unit having the front side plate and the rear side plate. In the photosensitive drum mounting device, the front bearing member and the rear bearing member are configured to rotatably mount the photosensitive drum by inserting bearing holes in the front plate and the rear plate while supporting the cylindrical shaft portion, respectively. By attaching and detaching the front bearing member and the rear bearing member in the axial direction, the photosensitive drum can be attached to and detached from the developing unit, and the front side plate and the rear side plate have the front side bearing member and the rear side bearing member. A stopper member for locking the member at a predetermined position in the axial direction is provided, and the front bearing member and the rear bearing member are rotated to oppose the locking portion of the stopper member. Since it has a locking groove that engages and disengages the photosensitive drum, the photosensitive drum can be quickly replaced without damaging or damaging the photosensitive drum when attaching or detaching the photosensitive drum, and the photosensitive drum is lightweight and low-cost. There are many effects such as providing a drum mounting device.

[Brief description of drawings]

FIG. 1 is a sectional view of a main portion of a photosensitive drum mounting portion according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of the arrow A, and FIG. 3 is a sectional view of a conventional photosensitive drum mounting portion. FIG. 4 is an arrow view from the C direction. 11 …… Rear side plate, 12 …… Front side plate, 13 …… Photosensitive drum, 14…
… Drum flange, 15 …… Front bearing member, 16 …… Rear bearing member, 17 …… Stopper member, 18 …… Drum receiving part, 19
...... Locking groove.

Claims (1)

[Claims] 1. A photosensitive drum comprising a flange having a cylindrical shaft portion fixed to opening portions at both ends of the photosensitive drum,
A photosensitive drum mounting device rotatably mounted between a front plate and a rear plate, wherein the front bearing member and the rear bearing member respectively insert the bearing holes of the front plate and the rear plate while supporting the cylindrical shaft portion. And rotatably attach the photosensitive drum, and by attaching and detaching the front bearing member and the rear bearing member in the axial direction, the photosensitive drum can be attached and detached.
The front plate and the rear plate are provided with stopper members for locking the front bearing member and the rear bearing member at predetermined positions in the axial direction, and the front bearing member and the rear bearing member are rotated by the stopper member. A photosensitive drum mounting device having a locking groove for engaging and disengaging with respect to the locking part of the.