JPS6250844A - Electrophotographic recording device - Google Patents

Abstract

PURPOSE:To facilitate the positioning of both a developing device and a cleaning device to a photosensitive body with a simple structure by moving both devices to or away from the photosensitive drum through the rotation of a positioning plate. CONSTITUTION:Respective positioning plates 20 rotate as shown by arrows, for example, in operation with a main switch on. Consequently the positioning plate 20 pushes respective engagement pins 14b and 17b to rotate the developing device 14 and cleaning device 17 around support pins 14a and 17a toward the photosensitive drum 11. Then, copying operation is carried out in this state. When the recording device is turned off with the main switch off after the copying operation, a driving means releases the positioning plates 20 from being rotated. Consequently, the developing device 14 and cleaning device 17 move away from the photosensitive drum 11 by gravitation or with the energizing force of an elastic member and the positioning plates 20 rotate until the state shown by a full line. Thus, both devices are easily positioned.

Description

[Detailed Description of the Invention] - U of U (Industrial Application Field) The present invention is an electronic method that forms an electrostatic latent image on a photoreceptor and develops the electrostatic latent image with toner to make it visible. The present invention relates to a photographic recording apparatus, and particularly to an electrophotographic recording apparatus in which a developing device and a cleaning device can be easily approached and separated from a photosensitive drum.

(Prior Art) An electrophotographic copying machine, which is an electrophotographic recording device, uses toner to convert an electrostatic latent image formed on a photoreceptor drum by a developing device disposed around the photoreceptor drum. After being developed and visualized and transferred to transfer paper.

The remaining toner on the photosensitive drum is scraped off by a blade of a cleaning device.

The developing device and the cleaning device must be placed close to the photoreceptor. but.

If the developing device and cleaning device come into too much contact with the photoreceptor drum, there is a risk of damaging the surface of the photoreceptor drum.

On the other hand, if the distance is too high, development and cleaning will not be completed completely. Therefore, it is necessary to quickly and precisely determine the position of the developing device and cleaning device with respect to the photosensitive drum. Conventionally, the position of the developing device and cleaning device relative to the photoreceptor drum has been determined by, for example, a setting jig or a bolt (or nut) attached to each.
This is determined and fixed by, for example, engaging a nut (or bolt) attached to the main body of the device. These methods have drawbacks such as extremely time-consuming and complicated positioning.

Furthermore, in the cleaning device, the blade must be in contact with the photoreceptor drum at all times, which causes severe damage to the photoreceptor drum, resulting in a significant loss of durability.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems of the prior art,
The object is to provide an electrophotographic recording apparatus that has a simple structure and allows easy positioning of a developing device and a cleaning device with respect to a photosensitive drum. Another object of the present invention is to provide a photoreceptor drum, a cleaning device, and an electrophotographic recording apparatus that can significantly improve the durability of the photoreceptor drum.

(Means for Solving the Problems) The electrophotographic recording device of the present invention includes a positioning plate rotatably attached to the photoreceptor drum; A rotatable developing device and a cleaning device; an engaging means for engaging the developing device and cleaning device with a positioning plate, and the developing device and cleaning device are rotated by rotation of the positioning plate. The photoreceptor drum is configured to approach or separate from the photoreceptor drum, thereby achieving the above object.

(Example) Examples of the present invention will be described below.

As shown in FIG. 1, an electrophotographic copying machine which is an electrophotographic recording device of the present invention has a photosensitive drum 11 disposed in the center of a copying machine main body 10 so as to be rotatable in the direction of the arrow. ing. A charger 12 is disposed above the photosensitive drum 11. A charger 1 is installed around the photoreceptor drum 11.
2, a toner storage tank 13. A developing device 14 and a transfer device 15 are arranged in sequence, and the transfer device 15 is located below the photosensitive drum 11. Further, a waste toner storage tank 16 and a cleaning device 17 are sequentially arranged downstream of the photosensitive drum 11 in the rotational direction.

The photosensitive drum 11 has a support shaft 11a arranged at its axial center.
9 are rotatably attached and supported, for example, on each side of the device main body 10. Two, for example, trapezoidal positioning plates 20 as shown in FIG. They respectively penetrate through holes 25 provided in the positioning plate 20. Each positioning plate 20.

It can rotate around the support shaft 11a.

Support pins 14a are provided at the top of each side of the developing device 14.

The positioning plates 20 each pass through elongated holes 21 and are rotatably attached to, for example, the copying machine main body 10 . Therefore, the developing device 14 is connected to each support pin 14.
It is rotatably suspended at a point 2, and is normally kept at a position separated from the photoreceptor drum 11 by its own weight or the biasing force of an elastic member. Long hole 2 of each positioning plate 20
1 has an arcuate shape so that the positioning plate 20 can rotate around the support shaft 11a of the photosensitive drum 11.

At the bottom of each side of the developing device 14, an engaging pin 14 is provided.
b are respectively attached, and each engagement pin 14b engages with an engagement hole 23 formed in one positioning plate 20, respectively. The engagement means 30 is constituted by both. Each engagement hole 23 is.

The photoreceptor drum 11 has an elongated shape extending substantially in the radial direction of the photoreceptor drum 11 .

At the top of each side of the cleaning device 17 are support pins 1.
7a are provided, and each support pin 17a is
Each of the positioning plates 20 passes through a long hole 22, and is rotatably attached to, for example, the copying machine main body 10. Therefore, the cleaning device 17 is rotatably suspended from each support bin 17a, and is normally kept at a position separated from the photoreceptor drum 11 by its own weight or the biasing force of an elastic member. each positioning play)
Each of the long holes 22 has an arc shape so that the positioning plate 20 can rotate around the support shaft 11a of the photosensitive drum 11.

At the bottom on each side of the cleaning device 17.

Engagement pins 17b are respectively attached, and each engagement pin 17b is engaged with an engagement hole 24 formed in the positioning plate 20, respectively. The engagement means 40 is constituted by both of them. Each engagement hole 24 has an elongated shape extending substantially in the radial direction of the photoreceptor drum 11 .

Engagement holes 23 and 2 in each positioning plate 20
4 indicates that when the positioning plate 20 rotates to the position shown by the two-dot chain line in FIG.
The shape 1 position and the like are determined so that the developing device 14 and the cleaning device 17 can be moved to a position close to the photoreceptor drum 11 by pressing the respective parts 7b.

Each positioning plate 20 is rotated in the direction of the arrow in FIG. 2 by driving means such as a solenoid (not shown). The driving means is configured to be linked with a main switch or a copy switch in a copying machine.2 For example, when the main switch is turned on, each positioning plate 20 rotates in the direction of the arrow in FIG. The positioning plate 20 presses each engagement bin 14b and 17b to rotate the developing device 14 and cleaning device 17 around support pins 14a and 1'72, respectively, and moves each developing device 14 and cleaning device 17 to the photoreceptor. It is brought close to the drum 11. In this case, the blade inside the cleaning device 17 comes into contact with the photosensitive drum 11 . Copying work is then performed in this state. This copying process is similar to that of conventional electrophotographic copying machines, in which an electrostatic latent image corresponding to the original image is formed on a photoreceptor, and the electrostatic latent image is visualized with toner, and the toner image is Transfer electrostatically to transfer paper.

When the copying operation is completed and the main switch is turned off to be inactive, the driving means releases the rotation of the positioning plate 20. Due to this.

The developing device 14 and the cleaning device 17 rotate in a direction away from the photosensitive drum 11 due to their own weight or the biasing force of an elastic member, and the first positioning plate 20 is pressed by each engagement bin 14b and 17b, as shown in FIG. It rotates to the state shown by the solid line.

In this embodiment, when the driving means releases the rotation of the positioning plate 20 at the end of the copying operation, the plate is moved in the opposite direction in an attempt to return to its original state due to the weight of the developing device or the cleaning device or the biasing force of the elastic member. It is designed to rotate.

However, the first positioning plate 20 may be rotated in the opposite direction by a driving means.

(Effect of the invention) The electrophotographic recording device of the present invention is thus configured.

By rotating the positioning plate, the developing device and the cleaning device can be integrally moved toward and away from the photoreceptor drum.

Each positioning can be done quickly, easily and with high precision. The developing device and the cleaning device can be separated from the photoreceptor drum.

In particular, since the developing device and the cleaning device can be brought close to the photoreceptor drum only during use, there is no risk of damaging the photoreceptor drum, and the durability of the photoreceptor drum is significantly improved.

The developing device and the cleaning device are separated from the photosensitive drum by their own weight or the urging force of an elastic member, resulting in a simple structure. If the positioning plate is rotated in the opposite direction by the driving means to separate the developing device and cleaning device from the photosensitive drum, the troublesome work for positioning the center of gravity of the developing device and cleaning device is unnecessary. .

4. Figure 1 is a sectional view showing the inside of an electrophotographic copying machine which is an electrophotographic recording apparatus of the present invention, and Figure 2 is a schematic diagram of the main parts thereof.

10... Copying machine main body, 11... Photosensitive drum, 14
...Development gW, 14 b, 17 b... Engagement pin, 17... Cleaning device, 20... Positioning plate, 23.24... Engagement hole.

30, 40...Engagement means.

that's all

Claims (1)

[Scope of Claims] 1. A positioning plate rotatably attached to the photoreceptor drum; a developing device and a cleaning device that can rotate toward and away from the photoreceptor drum; An electronic device comprising an engaging means for engaging the developing device and the cleaning device with a positioning plate, and configured to cause the developing device and the cleaning device to approach or separate from the photosensitive drum by rotation of the positioning plate. Photographic recording device. 2. The electrophotographic recording apparatus according to claim 1, wherein the engaging means includes an engaging pin provided on the developing device and the cleaning device, and an engaging hole formed in the positioning plate. 3. The electrophotographic recording apparatus according to claim 1, wherein the developing device and the cleaning device are rotated in a direction away from the photosensitive drum by their own weight or the urging force of an elastic member. 4. The electrophotographic recording apparatus according to claim 1, wherein the positioning plate rotates to bring the developing device and the cleaning device closer to the photosensitive drum only when the positioning plate is activated.