JPS59226370A - Cleaning device - Google Patents

Abstract

PURPOSE:To prevent the surface of a photosensitive body from being made into a mat to extend the life of the photosensitive body by providing a means which not only runs a web of a cleaning unit in the direction opposite to the rotation direction of the photosensitive body but also moves it back and forth in the axial direction. CONSTITUTION:Simultaneously with the start of rotation of a photosensitive body 1, a web driving motor 11 rotates and drives a pressure roll 4 and a winding roll 7 through a chain 12. Then, a web 6 for polishing and cleaning is carried in the direction opposite to the rotaion direction of the photosensitive body 1 and is wound up by the winding roll 7. Simultaneously, a driving motor 13 is rotated to drive a crank 8. Therefore, a hole 9a in one end of a rod 9 si moved back and forth, and a web cleaning unit 10 is moved back and forth in the axial direction of the photosensitive body 1 to polish and clean the photosensitive body 1 in the axial direction. Thus, the surface of the photosensitive body is prevented from being made into a mat, and the life of the photosensitive body is extended.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device applied to an image forming apparatus such as an electrostatic copying machine, a laser beam printer, or a micro device.

Conventionally, a plate cleaning method has been widely used as this type of device. In addition, in order to further extend the durable life of the blade and photosensitive cylinder, a lubricant such as Teflon powder is applied to the surface of the photosensitive cylinder.
A method is also known in which the web is pressed against a photosensitive cylinder in order to remove excess Teflon powder that has adhered to the web.

A conventional example will be explained using diagram M1.

To explain from the -L flow in the rotational direction of the photosensitive cylinder l, the toner T scraped off by the cleaning blade 14 fixedly installed in pressure contact with the photosensitive cylinder l flows into a duct 15 provided surrounding the cleaning blade 14. It is sucked in by the airflow flowing through it and carried out.

Next, the photosensitive cylinder l that has passed through the cleaning blade 14 is wound around the supply shaft 2 of the web cleaning unit 10, and the web 6 passes through the guide roller 3 and is pressed by the pressure roller 4. The toner T and lubricant powder 17 that have passed through the cleaning blade 14 are collected and rolled up by the winding roller 7. At this time, the web 6 is connected to the photosensitive cylinder 1.
Polish the surface uniformly.

The photosensitive cylinder 1 that has passed through the web cleaning unit 10 is coated with a lubricant powder 17 such as Teflon, which is supplied from a lubricant hopper 18 and coated with a coating plate 1 fixed to the bottom of the hopper 18 so as to be in pressure contact with the surface of the photosensitive cylinder 1.
6 and subjected to the next image forming cycle.

Conventionally, in this type of apparatus, the polishing ability was insufficient because the web was fed only in the direction opposite to the advancing direction of the photosensitive cylinder and the polishing direction was unidirectional.

In particular, when used in a printer that outputs a large amount of copy paper P for continuous forms, the surface layer 1a of the photosensitive cylinder l, which is often in contact with the copy paper P through the toner T, and the printing Copy paper P
Since the surface layer 1b is likely to be in direct contact with the copy paper P, the number of times the surface layer ib of the photoreceptor l, which is in direct contact with the copy paper P, is rubbed by the copy paper P or the cleaning web increases as the number of sheets passed increases. The surface layer 1b has thin scratches and loses its luster, that is, becomes matte. Even if this matte surface layer 1b is cleaned, the toner T remains in the small scratches 1c as shown in Fig. 3, and during the next copying, the remaining toner T is transferred to the copy paper P, forming unnecessary black streaks. The problem was that dirt appeared on the image.

An object of the present invention is to provide a cleaning device for an electrostatic image forming device and an image recording device that can prevent unnecessary black lines from forming on copies and extend the life of a photosensitive cylinder.

The present invention provides a cleaning device for an electrostatic image forming device or an image recording device in which the web of the cleaning unit moves reciprocatingly in the axial direction of the photosensitive cylinder instead of traveling in the opposite direction to the rotating direction of the photosensitive cylinder. One stage is provided for holding the door.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view including a partial cross section of the web cleaning unit, FIG. 5 is a cross-sectional view of 4+N, FIG. 6 is a perspective view showing the web conveyance drive section, and FIG. 7 is the web cleaning unit. It is a perspective view showing a reciprocating drive part of.

Web Cleaning Units) 10 is a rectangular box 10a
is based on. The box 10a has a bottom portion slidably guided by a kite rail 5 which is fixed parallel to the axis of the photosensitive cylinder 1 so as to face the peripheral surface of the photosensitive cylinder 1, and has an opening tab at the bottom portion. A supply shaft 2 and a winding roller 7 are rotatably fixed to the side surface of the box 10a by bearings (not shown), and a kite roller 3 is rotatably fixed to the side surface of the box 10a.
is rotatably fixed, and a pressure roller 4 is rotatably fixed to a side door of the box 10a. The web 6 is the supply shaft 2
The film is wound up into the winding roller I-2, is stretched on the inner surface of the guide roller 3, is brought into pressure contact with the surface of the photosensitive cylinder l on the outer surface of the pressure roller 4, and is rolled up and raised by the winding roller 7. 6th
As shown in the figure, the pressure roller 4 and the winding roller 7 are provided with sprockets 4a and 7'a provided at their respective shaft ends. A sprocket 11a fixed to the shaft of a motor 11 fixed to a box 10a and a tension spring 21 fixed at one end.
A check 712 is stretched between the sprocket 20 and the sprockets 4a and 7a, whose other ends are locked to the support shaft and urged outward. The box 10a has a protrusion lθb with a straight butt 10c, IkIIlOC is pivoted in a hole 9a (FIG. 7) in one end of the rod 9, and the other end of the rod 9 is in a pin 8a of the upright crank 8. The crank 8, which is pivotally mounted and stands upright, is fixed to a motor I3 fixed to a machine frame (not shown) and an output shaft of a gear train 19 connected thereto.

As soon as the photosensitive cylinder 1 starts rotating, the web drive motor 11 rotates and the drive transmission check 712 starts moving. The driving chain 7 transmits its force to the pressure roller 4, the winding opening, and the -rough, and the web 6 for polishing and cleaning is transferred to the photosensitive cylinder 1.
is conveyed in the opposite direction to the rotating direction of the winding roller 7.
It is being rolled up. At the same time, the drive motor 13 (FIG. 71) rotates in order to reciprocate the web cleaning unit IO along the kite trays 1 to 5, and drives the crank 8 via the gear train 19. crank 8
When rotates, the hole 9a at one end of the crank 9 moves back and forth, thereby moving the web cleaning unit l-10 in the axial direction of the photosensitive cylinder, thereby polishing and cleaning the photosensitive crank 1 in the axial direction.

As explained above, it has a simple structure in which the web cleaning unit that cleans and polishes is added with the function of reciprocating in the axial direction of the photosensitive cylinder, and the photosensitive cylinder is exposed to light by slight differences in the number of times the copy paper contacts the photosensitive printer. By uniformly polishing and cleaning the surface layer of the crank to eliminate matting, it prevents black streaks from appearing on images on copy paper, and also prevents matting, which extends the life of the photosensitive crank. I was able to extend it.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the cleaning device, Fig. 2 is an explanatory diagram showing the contact situation between the copy paper and the photosensitive crank, Fig. 3 is an explanatory diagram of the appearance of black streak stains on the copied image, and Fig. 4 is an explanatory diagram of the present invention. FIG. 5 is a cross-sectional view of FIG. 4, FIG. 6 is a perspective view of the web conveyance drive section, and FIG. 7 is a web cleaning unit drive section. FIG. 1...Photosensitive cylinder la, lb...Surface layer IC・
... Scratch 4 ... Pressure roller 5 ... Guide rail 6
...Web 8...Crank 9...Lot 10
...Web cleaning unit 11.13...
Motor 12... Cheno 19... Catlane 2
0... Sprocket P... Copy paper T... Tona patent applicant Canon Co., Ltd. agent Arai - Department

Claims (1)

[Claims] 1. A cleaning device applied to an image forming apparatus includes a blade cleaning means, a device for applying powder to an image carrier, and a device for removing powder from the image carrier by pressing it against the image carrier. 1. A cleaning device characterized in that the removing device not only travels in a direction opposite to the traveling direction of the image carrier but also reciprocates in a direction crossing the traveling direction.