JPH0137214Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] Movement in the axial direction of a rotating drum removably attached to a main shaft whose one end is cantilevered is fixed via a frame provided at the other end of the main shaft. A rotating drum fixing structure designed to reduce the number of steps needed to install and remove the rotating drum and to prevent parts from being lost.

[Industrial application field]

The present invention relates to a rotating drum fixing structure that facilitates the mounting and removal of a rotating drum type photoreceptor used in, for example, an electrophotographic recording device.

For example, an electrophotographic recording device utilizes the photoconductivity and electrostatic phenomenon of substances, and uses a rotating drum made of a light alloy whose outer periphery is coated with a photoreceptor such as amorphous selenium. After imparting photosensitivity to the outer periphery of this rotating drum by uniformly charging it by corona discharge, etc., a laser beam is selectively irradiated to create an electrostatic latent image. This is a device that develops the image using powdered toner, transfers the resulting toner image onto recording paper, and fixes it.

In general, the photoreceptor coated on the rotating drum is soft, and as a result of use, the surface is likely to suffer minute damage, which is a major cause of deterioration in recording quality.

For this reason, the rotating drum is treated as a semi-expendable item and is replaced relatively frequently based on the usage time (the amount of recording paper used).

This work is performed by maintenance workers, but it is generally done at the location where the equipment is installed and the work environment is not good, so it is desirable to take structural considerations such as facilitating replacement work and preventing loss of parts. .

[Conventional technology]

FIG. 2a is a cross-sectional view showing a conventional example of a rotating drum fixing structure, in which frames 1a and 1b are provided in parallel and facing each other at a predetermined interval, and 2 is a frame with one end cantilevered on one frame 1a. The main shaft is supported; 3 is a rotating drum that is detachably attached to the main shaft 2; 4 is a fixed plate provided with a reamer hole 4a and a circular hole 4b facing the tip of the main shaft 2 (see Fig. 2b); 5 is a mounting screw for attaching the fixing plate 4 to the other frame 1b, and 6 is a screw that is inserted into the circular hole 4b of the fixing plate 4 and removably engaged with the tip of the main shaft 2 (see the perspective view in Fig. 2c). The stopper 7 (see perspective view in FIG. 2D) is a coil spring provided between the stopper 6 and the rotating drum 3.

With such a configuration, the rotating drum 3 is attached as follows.

The rotating drum 3 is inserted through the circular hole of the frame 1b, and the bearings 3a and 3b provided on the rotating drum 3 are fitted onto the main shaft 2.

Insert the coil spring 7 into the main shaft 2.

Fixing plate 4 is attached to frame 1 using mounting screws 5.
Fix it to b.

Insert the stopper 6 into the tip of the main shaft 2 through the circular hole 4b of the fixing plate 4, and then press the pin 6a of the stopper 6.
is locked by engaging with the pin groove 2a at the tip of the main shaft 2.

As a result, one bearing 3a of the rotating drum 3 is pressed against the stepped portion 2b of the main shaft 2, and the other bearing 3a is pressed against the stepped portion 2b of the main shaft 2.
Since b is pressed by the coil spring 7,
It is fixed in the axial direction of the main shaft 2.

[Problem that the invention attempts to solve]

The rotary drum fixing structure having the above configuration has a problem in that it requires a lot of man-hours because it is necessary to attach and detach the mounting screws 5 when replacing the rotary drum.

Therefore, an object of the present invention is to reduce the number of man-hours required for loading and unloading the rotating drum.

[Means for solving problems]

The present invention attempts to solve the above-mentioned problems by using pins 8 and springs 9 instead of the conventional mounting screws.

[Effect]

That is, the tip of the main shaft is supported by a plurality of pins provided on the frame via a fixing plate and a stopper, and a spring is provided between the stopper and the stopper that is locked to the end of the main spindle. , the fixing plate is configured to be pressed against the frame.

〔Example〕

Hereinafter, the gist of the present invention will be specifically explained using examples.

FIG. 1 is a cross-sectional view of one embodiment of the rotating drum fixing structure according to the present invention, and the same reference numerals as in the conventional example in FIG. 2 refer to the same objects. A plurality of pins 9 are coil springs provided between the stopper 6 and the fixing plate 4.

With such a configuration, the rotating drum 3 is attached as follows.

The rotating drum 3 is inserted through the circular hole of the frame 1b, and the bearings 3a and 3b provided on the rotating drum 3 are fitted onto the main shaft 2.

Insert the coil spring 7 into the main shaft 2.

By fitting the reamed hole 4a into the pin 8 provided on the frame 1b, the fixing plate 4
Attach it to frame 1b.

Insert the stopper 6 into the tip of the main shaft 2 through the circular hole 4b of the fixing plate 4, and then press the pin 6a of the stopper 6.
Pin groove 2a at the tip of main shaft 2 (see Figure 2c)
It locks by interlocking with it.

As a result, the rotating drum 3 is fixed in the axial direction of the main shaft 2 in the same manner as in the conventional example, and at the same time, the fixing plate 4 is pressed against the other frame 1b by the stopper 6 via the coil spring 9. and is fixed so that it does not come off the pin 8.

[Effect of idea]

As explained above, according to the present invention, replacing the rotating drum can be performed more easily than in the conventional example, reducing the number of man-hours, and also eliminates the problem of easy loss of mounting screws.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the embodiment, and FIGS. 2 a to 2 d are configuration diagrams of the conventional example. In the figure, 1a and 1b are frames, 2 is a main shaft, 3 is a rotating drum, 4 is a stop plate, 6 is a stopper, 7 and 9 are coil springs, and 8 is a pin.

Claims (1)

[Claims for Utility Model Registration] Movement in the axial direction of a rotary drum 3 removably attached to a main shaft 2 whose one end is cantilever-supported by one opposing frame 1a is controlled by one frame 1a.
It is a rotating drum fixing structure that is fixed via the other frame 1b facing the other frame 1b, and includes a plurality of pins 8 provided on the outside of the other frame 1b, a reamer hole 4a that fits into the pins 8, and the main shaft 2. a fixing plate 4 having a circular hole 4b facing the tip of the main shaft 2; a stopper 6 that is fitted through the circular hole 4b and detachably latched to the tip of the main shaft 2; A rotating drum fixing structure characterized by comprising a spring 9 provided between the fixing plate 4 and the fixing plate 4.