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Image forming apparatus

An image and image bearing technology, applied in the direction of electrical recording process applying charge pattern, equipment for electrical recording process applying charge pattern, electrical recording technique, etc.

Active Publication Date: 2012-03-28
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this control of biasing the cleaning brush while the intermediate transfer belt is not rotating results in the bias being continuously applied from the start of bias application to the start of rotation of the intermediate transfer belt.

Method used

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  • Image forming apparatus
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0021] (1) The overall structure of the printer

[0022] figure 1 The overall structure of the printer 10 is shown.

[0023] Such as figure 1 As shown, the printer 10 that uses a known electrophotographic system to perform image formation includes an image processing unit 11, a feeder 12, a fixing section 13, a controller 14, and the like. The printer 10 is connected to a network (for example, LAN), and when receiving a print job execution instruction from an external terminal device (not shown), it executes color image formation according to the instruction. The color image is composed of yellow, magenta, cyan, and black. composition. The reproduced colors of yellow, magenta, cyan, and black are denoted as Y, M, C, and K, respectively, and the letters Y, M, C, and K are attached to numbers related to the reproduced colors.

[0024] The image processing unit 11 includes image forming units 20Y, 20M, 20C, and 20K corresponding to colors Y to K, an intermediate transfer belt 21, and ...

no. 2 example

[0069] The above embodiment explained an exemplary configuration in which the oppositely charged (positive) residual toner 29 is collected by electrostatic adsorption. The configuration of the present embodiment differs from the above-described embodiment in the following point: a negative voltage is applied to the positively charged residual toner 29 to make the residual toner 29 negatively charged. Hereinafter, in order to avoid repetitive description, the description of the same content as the first embodiment is omitted, and the same components are given the same reference signs.

[0070] Figure 4 Shows the cleaner 80 according to this embodiment.

[0071] Such as Figure 4 As shown, the cleaner 80 includes a charging brush 81, a first cleaning bias output portion 54, a second cleaning brush 55, a second collecting roller 56, a second scraper 57, a second cleaning bias output portion 58, and a smoke prevention seal Piece 59 and so on.

[0072] The charging brush 81 is composed...

no. 3 example

[0077] In the above embodiment, the voltage value of the downstream cleaning bias is maintained at Vc lower than the reference value Vr before the intermediate transfer belt 21 starts to rotate, and is switched to Vr in synchronization with the intermediate transfer belt 21 starts to rotate. The present embodiment differs from the above-described embodiment in the following point: even after the intermediate transfer belt 21 starts to rotate, the voltage Vc is maintained for a predetermined period of time, and is switched to Vr' after the predetermined period of time elapses.

[0078] Figure 5 It is a timing chart showing the switching of the downstream cleaning bias according to this embodiment.

[0079] As shown in the figure, even at t2 and after when the intermediate transfer belt 21 starts to rotate, the value of the downstream cleaning bias is maintained at Vc, and is switched to Vr' at t3 when a predetermined time period T2 has elapsed from time t2. . As described above, t...

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PUM

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Abstract

An image forming apparatus comprises: am image carrier, a transfer part, a cleaning member and a voltage supplier operable to apply, to the cleaning member, a bias voltage that has a polarity opposite to a normal charging polarity of a toner. Before the image carrier starts to rotate, the voltage supplier is used to apply the bias voltage, when Vr>0, 0<Vc<, and when Vr<0, Vr<Vc<0, wherein the Vc is a value of the bias voltage from a start of the application until a start of the rotation, and Vr is a reference value which is a value of the bias voltage from the start of the rotation onward. The image forming apparatus also comprises another cleaning member which is arranged at the upstream of the cleaning member along the rotation direction of the image carrier and in contact with the surface of the image carrier, wherein before the rotation starts to rotate, the voltage supplier applies, to the other cleaning member, the bias voltage that has the same polarity with the normal charging polarity so as to remove the toner residual on the image carrier surface and with the polarity opposite to the normal charging polarity, and when the rotation starts, after a predetermined time, the voltage supplier converts the bias voltage applied to the cleaning member from Vc to the reference value Vr.

Description

[0001] This application is based on application No. 2009-059784 filed in Japan, and the content of the application is hereby incorporated for reference. Technical field [0002] The present invention relates to an image forming apparatus including a rotatable image bearing member and a cleaning member in contact with the surface of the image bearing member. Background technique [0003] Image forming apparatuses capable of forming color images such as copiers include so-called tandem image forming apparatuses. The tandem image forming apparatus has a configuration in which photosensitive drums for each color of, for example, C (cyan), M (magenta), Y (yellow), and K (black) are arranged along the intermediate transfer belt; formed on the photosensitive drum The toner images of each color are sequentially transferred to the surface of the rotating intermediate transfer belt to overlap at the same position; and the toner images of each color that are initially transferred to the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/16
CPCG03G21/0035G03G2215/1661G03G15/161
Inventor 涩谷晓野口英俊原和义
Owner KONICA MINOLTA BUSINESS TECH INC