JP2000039781A - Cleaning device for bias roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device the web of which is made small in size and which has high cleaning efficiency by forming plural through-holes large enough to make a foreign matter removed from the surface of a bias roller pass on the surface of the web being in contact with the bias roller. SOLUTION: Bias is applied to the rotary shaft of a transfer roller 4 by a high-voltage power source 11, and a developed image on a photoreceptor durm 1 is transferred by carried recording material 3. The cleaning device recovering the foreign matter 10 such as paper powder or toner adhering to the surface of the roller 4 is equipped with the web 8 wound round between two shafts of a take-up roller 5 and a feeding roller 6, Plural through-holes 7 are formed on the surface of the web 8, By bringing the web 8 into contact with the surface of the roller 4 and applying specified load thereto, the foreign matter 10 such as the paper powder or the suspended toner adheres to the web 8, is scraped by a fiber part and made to drop into a dust collecting box 11 through the through-holes 7 in this device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a bias roller.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. As one form of a transfer device for transferring a developed image formed on the photoconductor 1 onto a recording material 3 such as paper, a bias voltage is applied to a shaft of a transfer roller 4 by a high-voltage power supply 11 and formed on the photoconductor 1. 2. Description of the Related Art A transfer device that transfers a developed image onto a sheet 3 that is conveyed while being held between a photosensitive member 1 and a transfer roller 4 is known. The cleaning device for cleaning the surface of the transfer roller 4 includes:
The web 8 wound between the two axes of the take-up roller 5 and the feeding roller 6 is brought into contact with the surface of the transfer roller 4 to wipe off foreign substances 10 such as paper dust and floating toner on the surface of the transfer roller 4. When the cleaning ability of the portion in contact with the surface of the transfer roller 4 is reduced, the take-up roller 5 of the web 8 is rotated by the take-up roller drive motor 9 to rotate the web 8 in contact with the surface of the transfer roller 4. A cleaning device is known in which the contact surface S1 of No. 8 is moved to the next unused surface S2 to maintain the cleaning ability.

[0003]

In the cleaning device of the prior art, one surface of the web 8 in contact with the surface of the transfer roller 4 is used in order to efficiently remove the foreign matter 10 attached to the transfer roller 4 for a long time. There has been a tendency to limit the number of rubs of the transfer roller 4 per contact by shortening a value defined by the total number of rotations of the transfer roller per one contact portion. In order to prolong the replacement life of the web 8, it is necessary to increase the roll length, which increases the size of the replacement member and deteriorates handleability.

Accordingly, it is an object of the present invention to provide a bias roller cleaning device having a small web size and high cleaning efficiency.

[0005]

An object of the present invention is to provide a bias roller provided in pressure contact with the surface of a photoreceptor, and a web which forms a portion in contact with the surface of the bias roller and is supported so as to be wound up. This is achieved by providing a plurality of through holes having a size through which foreign matter removed from the surface of the bias roller can pass, on the surface of the web contacting the bias roller.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3. FIG. In the figure, reference numeral 1 denotes a photosensitive drum having a photosensitive layer on the surface. The photosensitive drum 1 is driven to rotate by a drive motor 2. Reference numeral 4 denotes a transfer roller, which is provided so as to abut on the surface of the photosensitive drum 1 and rotate following the rotation of the photosensitive drum 1. A bias is applied to the rotating shaft of the transfer roller 4 by a high-voltage power supply 11, and the developed image on the photosensitive drum 1 is transferred to the recording material 3 being conveyed. Transfer roller 4
The cleaning device that collects foreign matters 10 such as paper dust and toner attached to the surface includes a web 8 wound between two axes of a take-up roller 5 and a feeding roller 6. A plurality of through holes 7 are provided on the surface of the web 8. When the web 8 is brought into contact with the surface of the transfer roller 4 and a predetermined load is applied thereto, foreign matter 10 such as paper dust and floating toner adheres to the web 8, and the foreign matter 10 is scraped off by the fiber portion to form the through hole 7.
The foreign matter 10 falls through the dust collection box 11 through the dust collection box 11.

The take-up roller 5 and the feeding roller 6
When the web 8 wound between the shafts reaches a prescribed value of the cleaning life on the contact surface of the transfer roller 4 in order to maintain the cleaning ability, the take-up roller 5 is rotated by the drive motor 9 to perform the transfer. The contact surface S1 between the roller 4 and the web 8 is moved to the next unused surface S2.

FIGS. 4 and 5 are explanatory views showing another embodiment. In the embodiment of FIG. 4, a constant contact force is applied to the manifold 13 by the contact force adjustment coil 14 through the duct 15 of the spiral air suction device 16 that sucks air to the back of the web 8. The foreign matter 10 scraped by the fiber portion is efficiently collected in the dust collection bottle 19 by the wind power of the blower 18 through the filter 17 of the suction device 16 through the through hole 7 of the web 8.

In the embodiment shown in FIG. 5, a pressure sensor 20 for detecting the suction force of air is provided on the manifold 13 of the embodiment shown in FIG. 4, and the detected value is analyzed by a control unit 21 to control a rotation speed variable circuit 22. Blower 18 to maintain a constant suction force
Or the contact surface of the web 8 is moved to a new surface so that the foreign matter 10 attached to the surface of the transfer roller 4 can always be efficiently removed, and the contribution rate of the web 8 is reduced, and the replacement cycle of the web 8 is changed. Can be extended.

[0010]

As described above, according to the bias roller cleaning apparatus of the present invention, a plurality of webs having a size that allows foreign matter removed from the bias roller surface to pass through the surface of the web that comes into contact with the bias roller. With a through hole,
By discharging foreign matters from the through holes, the cleaning efficiency of the bias roller surface can be improved, and the replacement life can be extended without changing the material of the web or increasing the total length.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a web according to the present invention.

FIG. 3 is a schematic side view showing one embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing another embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a conventional technique.

[Explanation of symbols]

4 transfer roller, 5 take-up roller, 6 feed-out roller, 7 through-hole, 8 web.

Claims (4)

[Claims] 1. A cleaning device for a bias roller, comprising: a bias roller provided in pressure contact with a surface of a photoreceptor; and a web forming a portion that comes into contact with the surface of the bias roller and supported so as to be able to be wound. A bias roller cleaning device, wherein a plurality of through-holes having a size through which foreign matters removed from the surface of the bias roller can pass are provided on the surface of the web in contact with the bias roller. 2. The bias roller cleaning device according to claim 1, further comprising a suction unit on a back side of the web for suctioning foreign matter discharged from the through hole. 3. A bias roller cleaning apparatus according to claim 2, further comprising a pressure sensor for detecting a suction force of said suction means, and a control means for controlling said suction force based on an output of said pressure sensor. . 4. The bias according to claim 1, wherein the bias roller is a transfer roller that transfers a developed image formed on the photoconductor onto a recording material. Roller cleaning device.