JPH0123149Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a cleaning device, and in particular to a device for cooling the surface temperature of a photoreceptor drum as much as possible in an image forming device such as an electrophotographic copying device. be.

[Prior art]

In general, in image forming devices such as electrophotographic copying machines, the surface temperature of the photoreceptor drum has negative effects such as crystallization of the photoreceptor, so it is recommended to cool the surface temperature of the photoreceptor drum as much as possible. There is a need to.

However, in the past, no special measures have been taken to lower the surface temperature of the photoreceptor drum, so the surface temperature of the photoreceptor increases, making it impossible to improve the image quality.

One solution to this problem is to make a large cut in the lower part of the cleaning device along the circumferential surface of the photosensitive drum to improve air circulation and cool the drum. This had the disadvantage that it could get into the lower part of the pipe and cause a jam.

[Purpose of invention]

The object of this invention is to eliminate the drawbacks of the conventional devices as described above and to provide a device for lowering the surface temperature of a photosensitive drum as much as possible.

[Structure of the idea]

This invention provides a cleaning device for removing residual toner from the surface of a photoreceptor drum, in which a housing opening toward the surface of the photoreceptor drum extends along the axial direction of the photoreceptor drum at the front side in the direction of rotation of the photoreceptor drum. The extending edges are deformed in the direction of rotation of the photoreceptor drum to form a deformed part, and outside of this deformed part, each fills the void formed by the deformation and is mutually exposed to light. It has a structure in which a plurality of ribs are formed at intervals in the axial direction of the body drum.

[Example of idea]

Embodiments of this invention shown in the drawings will be described below.

FIG. 1 shows an example of an electrophotographic copying machine equipped with a cleaning device according to this invention.
This electrophotographic copying apparatus includes a document placing table 1, an exposure lamp 2 that irradiates light while scanning the image surface of the document placed on the document placing table 1, and a predetermined light beam reflected from the document image surface. An optical system consisting of first, second, third, and fourth mirrors 3, 4, 5, and 6 that guide the light while maintaining the optical path length, and a lens 7, a photoreceptor drum 8, and a charging device that uniformly charges the surface of the photoreceptor drum 8. Toner is attached to an electrostatic latent image corresponding to the original image formed by exposing the electrode 9 and the charged surface of the photoreceptor drum 8 to light reflected from the original image surface guided by an optical system and developed. A developing device 10 and a paper feeding device 1 that feeds paper toward the photosensitive drum 8
1, a transfer/separation electrode 12 that attracts the toner on the surface of the photoreceptor drum 8 to the fed paper to transfer and separate the original image, a fixing device 13 that fixes the original image transferred to the paper, and a fixing device 13 that fixes the original image transferred to the paper; A cleaning device 14 is provided for removing toner remaining on the surface of the photoreceptor drum 8.

The cleaning device 14 is provided with a blade 16 for scraping off residual toner from the surface of the photoreceptor drum 8 in a housing 15 that opens toward the surface of the photoreceptor drum 8. As shown in FIG. 2, the photosensitive drum 8 is
The edge 17 extending along the axial direction of the photoreceptor drum 8 is deformed in the direction of rotation of the photoreceptor drum 8 to form a deformed portion, and a deformed portion is formed on the outside of this deformed portion 17, respectively. A plurality of ribs 18 fill the void thus formed and are spaced apart from each other in the axial direction of the photoreceptor drum 8,
18,... are formed.

Next, the operation of the above will be explained.

First, when the electrophotographic copying apparatus is operated, an original is formed on the surface of the photoreceptor drum 8 through a charging process using the charging electrode 9, an exposure process using the exposure lamp 2 and the optical system, and a developing process using the developing device 10. The image is transferred to and separated from the paper by a transfer/separation electrode 12, and toner remaining on the surface of the photosensitive drum 8 without being completely transferred is scraped off by a blade 16 of a cleaning device 14. .

Here, since the edge 17 of the housing 15 is deformed to form a deformed portion 17, the cleaning device 14 cleans the space between the ribs 18, 18, . Air can flow through the gap as shown by the arrow in FIG.
As a result, the surface temperature of the photoreceptor drum 8 can be efficiently cooled by the cleaning device 14.

Furthermore, due to the presence of the ribs 18, 18, . . . , the paper separated from the photosensitive drum 8 after transfer enters the space formed by the deformed portion 17, causing a so-called jam. Instead, it is guided by the ribs 18, 18, . . . and is reliably sent toward the fixing device 13.

[Effect of idea]

By configuring this idea as described above,
This has excellent effects such as being able to cool down the surface temperature of the photosensitive drum without using air from a fan installed in the copying machine.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of an electrophotographic copying machine equipped with a cleaning device according to this invention;
FIG. 2 is an enlarged perspective view of the main parts of the cleaning device. 1... Document placement table, 2... Exposure lamp, 3...
First mirror, 4... Second mirror, 5... Third mirror, 6... Fourth mirror, 7... Lens, 8... Photosensitive drum, 9... Charging electrode, 10... Developing device, 11 ... Paper feeding device, 12 ... Transfer/separation electrode, 13 ... Fixing device, 14 ... Cleaning device, 15 ... Housing, 16 ... Blade, 1
7... Edge/deformed part, 18... Rib.

Claims (1)

[Scope of utility model registration request] In a cleaning device for removing residual toner from the surface of a photoreceptor drum, an edge of a housing that is open toward the surface of the photoreceptor drum and extends along the axial direction of the photoreceptor drum on the front side in the rotational direction of the photoreceptor drum. A deformed part is formed by deforming the part toward the rotational direction of the photoreceptor drum, and each fills the void formed by the deformation on the outside of this deformed part, and is aligned with the axis of the photoreceptor drum. A cleaning device characterized in that a plurality of ribs are formed at intervals in the direction.