JPS60168183A - Cleaning device for image carrier - Google Patents

Abstract

PURPOSE:To allow toner clouds formed in a cleaning device from exiting from the cleaning device and preventing contamination in a copying machine by rotating a brush body in the direction opposite to the moving direction of an image carrier. CONSTITUTION:A brush body of 26mm.phi size formed by implanting acrylic fiber, e.g. ''Beslon'' of, for example, 25muphi thickness in a roll body to 7mm. fiber length and 200,000/cm<2> is used as the brush body, and this is brought in contact with a beltlike organic photosensitive body 1 to about 1mm. contact length and rotated in the opposite direction to and at the same rotating speed with the beltlike organic photosensitive body. Consequently, there is no leak of toner clouds in the cleaning device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cleaning device for an electronic copying machine, and more particularly to a cleaning device for removing and recovering toner remaining on an image carrier.

BACKGROUND TECHNOLOGY Various devices have been known to clean residual toner on image carriers such as electrophotographic photoreceptors.
For example, a leaning device as shown in FIG. 1 has been used.

In FIG. 1, reference numeral 1 indicates an electrostatic 841 carrier, and 2 indicates powder toner remaining on the electrostatic latent image carrier I after the transfer process.

The cleaning device is composed of a blade body 3 as a cleaner body for removing and recovering toner 2 from an electrostatic latent image carrier 1, and a brush body 4 as a cleaning auxiliary member. , both of which are electrostatic latent image carriers 1
Place it on top and in contact with this! The brush body 4 is disposed upstream of the blade body 3 in the moving direction of the electrostatic latent image carrier i. Further, a screw feeder type auger unit 5 is disposed between the brush body 4 and the blade body 3, and the toner 2 scraped off by the blade body 3 is discharged to the outside by the auger unit 5. It has become. on the other hand,
The brush body 4 is made of conductive fibers, and a voltage is applied to the conductive fibers by a bias voltage generator 8 via a metal plate 7 in contact with the conductive fibers. is rotating in the same direction as the moving direction (arrow) of the electrostatic latent image carrier 1.

The operation of this leaning device will be described below. The toner 2 remaining on the electrostatic latent image carrier 1 after the transfer process is completely neutralized by the brush body 4 which is biased to the polarity (1), and is also broken down by the brush body 4 and removed by the blade. The body 3 makes cleaning easier. The toner 2 thus scraped by the brush body 4 is scraped off by the blade body 4 and discharged to the outside by the auger unit 5.

However, in such conventional devices, the brush body 4 made of conductive fibers is used and a bias voltage is applied to it. The toner overflowed and this deteriorated the quality of the copy, and a large amount of toner cloud was generated due to contact with the metal plate 7, contaminating not only the cleaning device but the entire copying machine 9. Furthermore, the entire brush body 4 was contaminated. There is a problem that it deforms into a dumpling-shaped roll.

In order to eliminate such problems, the applicant uses an insulating brush body and uses the insulating brush body to break up the residual toner on the electrostatic latent image carrier without applying bias pressure. He invented a cleaning device plate that makes cleaning easier with a cleaner body, and has filed a separate application.

For this reason, IP and kneadable fibers such as suflon, nylon, rayon, holiflovirene, and acrylic fibers having a fiber thickness of 5 to 50 μm are added to the roll body, and the fiber length is 3 to I.
5 runs, density 1. A brush body is formed by implanting the brush body so that the brush body has a length of oOo~4oo, ooo/-, and the length of contact with the electrostatic latent image carrier is increased so that the electrostatic latent image carrier does not penetrate deeply into the brush body. It is preferable to arrange them so that they are in contact with each other so that the buried depth is 20.2 to 2 mm.

By using such a leaning device and rotating the brush body as described above in the same direction as the moving direction of the electrostatic latent image carrier at a speed A~5 times, a sufficiently satisfactory result can be obtained. I was able to get sex.

However, even if such a device is used, if copies are collected for a long time, a toner cloud will form at the point where the brush body and image carrier start contact (area A in Figure 1). However, a problem arises in that this particles come out of the cleaner device through the gap between the housing and the image carrier near the brush body, staining the entire inside of the copying machine, and there is a need to solve this problem.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a cleaning device that prevents the toner cloud generated within the cleaning device from coming out of the cleaning device and contaminating the inside of the copying machine, as described above, and to stabilize copy quality. The goal is to maintain good quality.

BACKGROUND OF THE INVENTION While searching for the point where a toner cloud is generated, the present inventors discovered that a toner cloud is generated in the region where the brush body starts contacting the image carrier (region A shown in FIG. 1). I discovered that.

By the way, each component of the cleaning device.

In terms of their functions, the brush body, the auger body, and the cleaner body are arranged in this order according to the moving direction of the image carrier, and conventionally, the toner is scattered in the direction of rotation of the brush body after coming into contact with the dust carrier. It is believed that the brush body was being rotated in the same direction as the moving direction of the image carrier. However, in reality, the opposite is true, and a toner cloud is generated in the region where the brush body starts contacting the image carrier as described above.

For this reason, since one side wall of the housing of the cleaning device is disposed close to the brush body, the toner cloud is discharged to the outside from the gap between the side wall of the housing and the image carrier.

Structure of the Invention The present invention has been made based on the above knowledge, and includes:
In a cleaning device consisting of a cleaner body for cleaning toner remaining on an image carrier and a brush body as a cleaning auxiliary member, the brush body is moved in a direction opposite to the moving direction of the image carrier. It is characterized by rotation. Namely, in the image carrier cleaning device according to the present invention, the brush body is rotated so that the region A where the toner cloud is generated faces the center of the cleaning device, thereby preventing the toner cloud from leaking to the outside of the cleaning device. It is. In this case, when the moving speed of the image carrier is υP, and the surface speed of the brush body is υB, it is preferable to set it so that vB-(0,5 to 3)×υP.

Embodiments Hereinafter, the present invention will be explained in detail while explaining embodiments shown in the accompanying drawings. For convenience of explanation, the same reference numerals are used for parts having the same functions as those of the conventional device shown in FIG.

Embodiment 1 The embodiment shown in FIG. 2 has the same basic structure as the conventional cleaning device shown in FIG. (Product name: λ, fiber length: 7 strands, density: 200.0
Using a brush body with a size of 26 wφ planted so as to have a brush body of 00 brushes/d, this was brought into contact with the belt-shaped organic photoreceptor 1 so that the contact length was about 1 brush, and the belt-shaped organic photoreceptor was The rotation direction was reversed and the rotation speed was set to be constant.

About +00,000 copies were collected under these conditions, but no toner cloud leaked from the cleaning device to the outside.

Implementation f! I 2 This example is an example in which the present invention is fully applied to a magnetic brush cleaning device in which a belt-shaped organic photosensitive material is used as an electrostatic latent image carrier and a one-component magnetic toner is used as a toner. The schematic structure of the reed is shown in Fig. 3.

In FIG. 3, 2α is a one-component magnetic toner containing a magnetic material inside the powder toner, and the cleaning device includes a magnetic brush cleaner 9 for magnetically attracting and cleaning this toner 2α. It is composed of a brush body 4α. The magnetic brush cleaner 9 includes a non-magnetic sleeve 10 rotatably fixed on its axis, and a roll-shaped magnet formed by alternately arranging a plurality of magnetic poles of different polarities fixed so as not to rotate inside the sleeve 10. It consists of 11. The sleeve 10 can be rotated in the same direction as the moving direction of one electrostatic latent image carrier I, and the rotational speed of the sleeve 10 can be made synchronous with the rotational speed of the electrostatic latent image carrier 1, and It is also possible to adjust the speed to higher speeds.

Further, the sleeve 10 is magnetically grounded. Further, a regulating blade 12 for controlling the dust of the one-component magnetic toner on the sleeve 10 is disposed at a predetermined position close to the sleeve 10. Belt-shaped organic photoreceptor 1
The one-component magnetic toner 2α remaining on the brush body 4c
After being broken down by L to make it easier to clean,
The one-component magnetic toner adsorbed on the surface of the non-magnetic cylindrical sleeve 10 of the magnetic brush cleaner 9 is rubbed in the cleaning area B and is magnetically cleaned.

In the above configuration, the same brush body 4at as that used in Example 1 is used as the brush body 4α, and this is brought into contact with the belt-shaped organic photoreceptor 1 so as to have a contact length of 1. The rotating direction was opposite to that of the shaped organic photoreceptor 1, and the rotating speed was set to be constant. Under these conditions t
Approximately oo or ooo copies were collected, but no toner cloud leaked from the cleaning device to the outside, and the quality of the copies obtained was stable.

In each of the embodiments described above, an example was shown in which a blade or a magnetic brush cleaner was used as the cleaner body, but various other cleaner bodies such as a brush cleaner may also be used. In addition to the electrostatic latent image carrier described above, the present invention can be applied to various other image carriers.

Note that the moving speed vP of the image carrier and the surface speed v of the brush body
As mentioned above, the relationship of B is υB−(0,5~3)×υ
It is preferable to set it to P. The reason for this is
If vB is less than 0.5 υP, it is difficult to break up the toner remaining on the electrostatic latent image carrier so that it is easily subjected to IJ-ing. On the other hand, if vB exceeds 3 vp, toner may scatter. This is not preferable because it becomes intense.

Effects of the Invention As described above, in the image carrier IJ-ning device according to the present invention, the brush body as a cleaning auxiliary member is rotated in the opposite direction to the moving direction of the image carrier, so that the brush body is rotated in the opposite direction to the moving direction of the image carrier. Since the area where the body starts contacting the image carrier, that is, the area where the toner cloud is generated, is rotated so that it faces the center of the cleaning device, leakage of the toner cloud to the outside of the cleaning device is almost eliminated, and the area inside the copying machine is contamination is prevented. Therefore, stable copies can always be obtained over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a conventional cleaning device, FIG. 2 is a schematic explanatory diagram showing one embodiment of the cleaning device according to the present invention, and FIG. 3 is a schematic explanatory diagram showing another embodiment. be. 1... Electrostatic latent image carrier, 2... Powder toner, 2a.
...-component magnetic toner, 3...blade body, 4゜4
σ...Brush body, 9...Magnetic brush cleaner. 10... Sleeve, 11 Magnet, A... Toner cloud generation area. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Tadashi Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] 1. A cleaning device comprising a cleaner body for cleaning toner remaining on an image carrier and a brush body as a cleaning auxiliary member, wherein the brush body is attached to the image carrier. An image carrier 17-ning device characterized by rotating an image carrier n in a direction opposite to a moving direction. 2. Claim 1, characterized in that the moving speed of the image carrier is set to be -vB-(0,5 to 3JXvP, where kvp is the surface speed of the brush body and UB is the surface speed of the brush body.
The image carrier cleaning device described in 2.