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Image forming apparatus

An image and toner image technology, applied in the field of color image forming devices, can solve the problems of complex structure, poor image, uneven density, etc.

Active Publication Date: 2006-04-12
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the methods described in Patent Documents 1 and 2, since a value with a large amount of charge of the toner on the intermediate transfer body is averaged, in a low-humidity environment or during second-side transfer in double-side copy mode, , In the case of high paper impedance, it is easy to produce defective images caused by the rising discharge of the paper potential. When the transfer voltage is suppressed to prevent the generation of defective images, transfer occurs in the part where the total charge of the toner image is large. Insufficient electric field, resulting in uneven concentration
[0011] In addition, in the structure in which the conductive roller material is arranged as the counter electrode on the reverse side of the intermediate transfer body facing the charger of the above-mentioned front charging device, when the speed of the image forming apparatus increases and the linear velocity of the intermediate transfer body increases, it is necessary to It becomes difficult to get the full charging effect
In addition, depending on the linear speed of the intermediate transfer body, the structure such as controlling charging conditions will also become complicated.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0058] In this example, with the configuration figure 1 And the color image forming device of the anti-distribution phenomenon consumer 9 and the opposite electrode 12 shown in FIG. 2 forms an image.

[0059] figure 1 The main configuration of the illustrated color image forming apparatus is as follows.

[0060] Intermediate transfer body 7: polyimide conveyor belt (volume resistivity 10 9 Ωcm), the line speed is 220mm / sec. Anti-discharge phenomenon consumer 9: the length L2 of the grid 92 is 40mm, and the distance L1 between the conveyor belt surface of the intermediate transfer body 7 is 1mm, and a DC voltage of +4kV is applied to the discharge electrode 91, and input to the grid 92 -50V DC voltage. Counter electrode 12: Conductive acrylic material manufactured by Toichi Co., Ltd. (the primary wire resistance value is 10 2 Ωcm, wire diameter is 0.33 tex hair length is 3mm), with 31000 wires / cm 2 The conductive brush 12a with a density of 45mm and a length L1 of flockin...

Embodiment 2

[0062] An image was formed under all the same conditions as in Example 1 except that the length L1 of the conductive brush 12 a of the counter electrode 12 was changed to 60 mm.

Embodiment 3

[0064] An image was formed under all the same conditions as in Example 1 except that the length L1 of the conductive brush 12 a of the counter electrode 12 was changed to 30 mm.

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PUM

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Abstract

The invention relates to an image forming device for forming image. The invention is characterized with that the image forming device comprises: an image forming section forming toner image; an image supporting body for load bearing the toner image formed by the image forming section; an intermediate transferring body, a part of which is supported in a state of a flat plane by supporting material; a primary transferring device to transfer the toner image forming on the image supporting body onto the intermediate transferring body; a secondary transferring device to transfer the toner image on the intermediate transfer printing body onto a transfer material; a scorotron discharging device which is arranged at an upstream side of the secondary transferring device, in moving direction of the intermediate transferring body, where the part of the intermediate transferring body is supported in the state of the flat plane, and is provided with a discharging electrode and a grid for discharging the toner image charge on the intermediate transferring body; and a conductive brush which is opposite to the scorotron discharging device and contacts rear surface of the intermediate transferring body.

Description

technical field [0001] The present invention relates to an image forming apparatus. In particular, it relates to a color image forming apparatus having an intermediate transfer body and transferring a toner image to the intermediate transfer body. Background technique [0002] As a color image forming apparatus using an intermediate transfer body, it is known that the toner image formed on the image carrier is transferred to the intermediate transfer body, and then the toner image on the intermediate transfer body is transferred. onto the transfer material. In this color image forming apparatus, after the toner image with a predetermined polarity charged on the image carrier is transferred to the intermediate transfer body using static electricity, the toner image on the intermediate transfer body is electrostatically transferred to the intermediate transfer body. The agent image is transferred to the transfer material. [0003] In particular, a color image forming appara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16G03G15/01
CPCG03G15/169
Inventor 木村丈信佐藤洋太郎浜田州太
Owner KONICA MINOLTA BUSINESS TECH INC