JPH06118854A - Cleaning device of image forming device - Google Patents

Abstract

PURPOSE:To obtain an inexpensive and compact cleaning device of an image forming device simple in mechanism, and easy in maintenance. CONSTITUTION:This device is provided with a first brush roller 7 impressed with a bias having polarity inverse to residual toner on an image carrier, a bias roller 9 impressed with a bias having polarity identical to the roller 7 and a large absolute value, a blade 10 scraping a foreign matter attached on the roller 9, a second brush roller 8 juxtaposed with the roller 7, a flicker member 13 flicking the foreign matter attached on the roller 8 and a carrying member 14 carrying the foreign matter flicked by the flicker member 13. The toner scraped from the roller 9 falls on the roller 8 and the flicker member 13 is arranged in the downstream side of the position where the toner falls and at an upper part in a gravity direction with respect to the roller 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device in an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, as a cleaning device in an image forming apparatus of this type, a first brush roller to which a bias having a polarity opposite to that of a residual toner on an image carrier is applied, and a first brush roller.
A second brush roller arranged in parallel with the brush roller;
The first and second bias rollers to which a bias having the same polarity as that of the second brush roller and a large absolute value is applied, and the first and second bias rollers.
The one having the first and second blades for scraping off the foreign matter adhering to the bias roller and the first and second transport members for transporting the foreign matter for the toner removed from the first and second brush rollers are very fair.
It is known as disclosed in 2-29222.

[0003]

By the way, in such a device, the first and second bias rollers, the first and second blades, and the first and second conveying members are required for each of the first and second brush rollers, There is a problem that the mechanism is complicated and maintenance is difficult, and in addition, the whole is large and expensive. Therefore, it is conceivable to use one transport member as a measure for solving such a problem, but it has the following problems. (1) The axial distance between the first and second brush rollers must be increased, (2) the diameter of the first and second bias rollers must be increased,
(3) The diameter of the first and second brush rollers must be increased.

Therefore, an object of the present invention is to solve the problems of the cleaning device in the conventional image forming apparatus as described above, and to have a simple mechanism and easy maintenance. An image forming apparatus is provided.

[0005]

In order to achieve the above-mentioned object, the present invention provides a first brush roller to which a bias having a polarity opposite to that of the residual toner on the image carrier is applied. A bias roller to which a bias having the same polarity as that of the first brush roller and a large absolute value is applied, and a blade for scraping off foreign matter adhering to the bias roller,
A second brush roller provided in parallel with the first brush roller, a flicker member for repelling foreign matter attached to the second brush roller, and a conveying member for conveying the foreign matter repelled by the flicker member are provided. The toner scraped off from the roller is dropped onto the second brush roller, and the flicker member is arranged downstream of the dropping position of the toner and above the second brush roller in the direction of gravity. It is a thing. According to a second aspect of the invention, in the first aspect of the invention, the first brush roller is arranged on the upstream side and the second brush roller is arranged on the downstream side in the traveling direction of the image carrier. According to a third aspect of the invention, in the first aspect of the invention, the first brush roller is arranged on the downstream side and the second brush roller is arranged on the upstream side in the traveling direction of the image carrier. According to a fourth aspect of the invention, in the first aspect of the invention, the diameter of the first brush roller is larger than the diameter of the second brush roller.

[0006]

According to the present invention as described above, claims 1 and 2 are provided.
In the invention of claim 1, after the transfer operation, the toner on the image carrier adheres to the first brush roller charged with the opposite polarity,
The toner is in contact with the first brush roller, is attracted to the bias roller to which a bias having the same polarity and a large absolute value is applied, and is scraped off by a blade in contact with the bias roller. It drops onto the second brush roller and is conveyed in the direction of the arrow. By the flicker member that is in contact with the second brush roller, the flicker member is blown off together with foreign matter such as paper dust and drops onto the conveying member to be conveyed to a bottle (not shown). Be recovered. In the invention of claim 3, the toner adheres to the first brush roller downstream in the moving direction of the image carrier, and the toner is then conveyed in the order of the bias roller and the upstream second brush roller, and the downstream first roller. The brush roller 7 is always kept in a clean state. In the invention of claim 4, the diameter of the first brush roller is the second
By being larger than the diameter of the brush roller,
The toner scraped off the bias roller by the blade can be dropped onto the upper part of the center of the second brush roller or the vicinity thereof.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment of the present invention shown in FIG.
A cleaning device 4 is arranged above the flat surface of the image carrier 1 made of a photosensitive belt stretched around the pulleys 2 and 3. The cleaning device 4 is an image carrier 1.
Has a cleaning unit 11 which is arranged at a position where it moves after the completion of the transfer process and which is detachably mounted on the rail of the image forming apparatus main body.
Pair of first and second brush rollers 7, 8 along the moving direction of the
Are lined up. A bias power source 12 applies a bias having a polarity opposite to that of the toner to the first brush roller 7. A bias roller 9 in contact with the first brush roller 7 is arranged, and a bias having the same polarity as the first brush roller 7 and a large absolute value is applied to the bias roller 9 by the power supply 21. There is.
A blade 10 for scraping off the toner adhering to the bias roller 9 is in contact with the bias roller 9, and a flicker member for repelling the toner and foreign matters conveyed by the second brush roller 8.
The flicker member 13 is arranged downstream of the dropping position of the toner and the foreign matter and above the gravity direction.

In the above-described apparatus, after the transfer operation, the toner on the image carrier 1 adheres to the first brush roller 7 which is charged with the opposite polarity, and this toner is the first brush roller 7.
In addition to being attracted to the bias roller 9 that is in contact with and is applied with a bias having the same polarity and a large absolute value,
The blade 10 in contact with the bias roller 9 scrapes it off, drops it onto the second brush roller 8 and conveys it in the direction of the arrow, and the flicker member 13 in contact with it scrapes foreign matter such as paper dust. Being flipped with the transport member
It is dropped into 14 and conveyed, and is collected in a bottle or the like (not shown).

The second embodiment of the present invention shown in FIG.
The brush roller 7 is provided downstream of the moving direction of the image carrier 1, and the rotation directions of the second brush roller 8 and the bias roller 9 are opposite to those of the first embodiment, which is different from the first embodiment. However, the toner is the first brush roller 7, the bias roller 9, and the second brush roller 8 as in the first embodiment.
Of the first brush roller 7 on the downstream side.
Is always kept in a clean state, and there is no fear that the image carrier 1 is sent out from the cleaning area while being contaminated.

In the third embodiment of the present invention shown in FIG. 3, the arrangement order of the first and second brush rollers 7, 8 is the same as that of the first embodiment, but the diameter of the first brush roller 7 is the second.
The difference is that the diameter is larger than the diameter of the brush roller 8. Due to this difference, the toner scraped off from the bias roller 9 by the blade 10 can be dropped onto the upper part of the center of the second brush roller 8 or in the vicinity thereof, and there is a possibility that the toner is dropped to other than the conveying member 14. Without
Moreover, it is easy to select the arrangement position.

[0011]

The present invention is as described above. The inventions of claims 1 and 2 are: a first brush roller to which a bias having a polarity opposite to that of the residual toner on the image carrier is applied; and the first brush roller. A bias roller having the same polarity as that of the roller and to which a bias having a large absolute value is applied, a blade for scraping off foreign matter adhering to the bias roller, a second brush roller provided in parallel with the first brush roller, and a second brush roller A flicker member for repelling foreign matter attached to the brush roller, and a conveying member for conveying the foreign matter repelled by the flicker member,
The toner scraped off from the bias roller falls on the second brush roller, and the flicker member is arranged downstream of the toner dropping position and above the second brush roller in the direction of gravity. The first brush roller is arranged on the upstream side and the second brush roller is arranged on the downstream side in the traveling direction of the above, and the toner attached to the first brush roller is sucked by the bias roller and is scraped off by the blade. Is dropped onto the second brush roller and conveyed, and is blown off by foreign substances such as paper dust by the flicker member and dropped onto the conveying member. Therefore, the bias roller and the flicker member can be made to be single. In addition to having a simple mechanism and easy maintenance, there is an effect that the whole is small and inexpensive. The invention of claim 3 relates to claim 1
In the invention, the first brush roller is arranged on the downstream side and the second brush roller is arranged on the upstream side in the traveling direction of the image carrier, and the toner is transferred to the first brush roller downstream in the moving direction of the image carrier. The toner adheres and is then conveyed over the bias roller and the second brush roller on the upstream side in this order, so that the first brush roller on the downstream side is always kept in a clean state, and the image carrier remains contaminated. The effect is that there is no fear of being sent out from the cleaning area. According to the invention of claim 4, in the invention of claim 1, since the diameter of the first brush roller is larger than the diameter of the second brush roller, the toner scraped off from the bias roller by the blade is removed from the second brush roller. There is an effect that it can be dropped to the upper part of the center or near the center thereof, there is no fear of dropping it to other than the conveying member, and that the arrangement position can be easily selected.

[Brief description of drawings]

FIG. 1 is a front view showing the arrangement of various parts of a first embodiment of the present invention.

FIG. 2 is a front view showing the arrangement of each part of the second embodiment of the present invention.

FIG. 3 is a front view showing the arrangement of each part of the third embodiment of the present invention.

[Explanation of symbols]

 1 image carrier 4 cleaning device 7 first brush roller 8 second brush roller 9 bias roller 10 blade 11 cleaning unit 13 flicker member 14 conveying member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoshi Hayakawa 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Naomi Misuna 1-3-6 Nakamagome, Ota-ku, Tokyo Shares Company Ricoh

Claims (4)

[Claims] 1. A first brush roller to which a bias having a polarity opposite to that of the residual toner on the image carrier is applied, and a bias roller to which a bias having the same polarity as the first brush roller and a large absolute value is applied. A blade for scraping off the foreign matter adhering to the bias roller, a second brush roller arranged in parallel with the first brush roller, a flicker member for repelling the foreign matter adhering to the second brush roller, and a flicker member for repelling the flicker member. The toner scraped from the bias roller falls onto the second brush roller, and the flicker member is located downstream of the toner drop position with respect to the second brush roller. A cleaning device in an image forming apparatus, wherein the cleaning device is arranged above in the direction of gravity. 2. A cleaning device in an image forming apparatus according to claim 1, wherein the first brush roller is arranged on the upstream side and the second brush roller is arranged on the downstream side along the traveling direction of the image carrier. 3. The cleaning device in the image forming apparatus according to claim 1, wherein the first brush roller is arranged on the downstream side and the second brush roller is arranged on the upstream side along the traveling direction of the image carrier. 4. The cleaning device in the image forming apparatus according to claim 1, wherein the diameter of the first brush roller is larger than the diameter of the second brush roller.