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Image forming device

An image and photosensitive drum technology, applied in the field of contact transfer image forming devices, can solve problems such as application

Inactive Publication Date: 2008-02-13
MURATA MASCH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the effect of the above-mentioned increase in the resistance of the transfer roller caused by toner adhesion is actually limited to the case of use in a low-temperature, low-humidity environment (so-called LL environment). and HH environment) basically has no effect when used
Therefore, if the compensation value is uniformly increased as described above, an excessively high voltage will be applied to the transfer roller at unnecessary portions, and there is room for further improvement in this regard.

Method used

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Examples

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Embodiment Construction

[0026] Embodiments of the present invention will be described below. FIG. 1 shows a multifunction peripheral 1 as an electrophotographic image forming apparatus. The multifunction machine 1 has a facsimile function, a copier function, and a printer function. A document reading unit 11 is provided on an upper portion of a casing 10 of the multifunction peripheral 1 . A document for facsimile transmission and a document for copying can be placed on the document reading unit 11 . An operation unit (operation unit) 18 is disposed on the front side of the document reading unit 11 (the side facing outward in FIG. 1 ). The operation unit 18 is provided for the user to operate the multifunction peripheral 1 . The operation unit 18 is provided with various operation buttons such as a touch panel display, ten keys, and arrow keys. In addition, a paper feed unit (recording medium supply unit) 12 is provided at the lower portion of the casing 10 . The sheet feeding section 12 can sto...

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Abstract

In an image forming device, when a transfer bias voltage is applied to a contact transfer member under a state in which a recording medium is nipped between a photoconductive drum and the contact transfer member, a toner image on a surface of the photoconductive drum is transferred onto the recording medium. A test voltage is applied to the contact transfer member under a state in which the recording medium is not nipped between the photoconductive drum and the contact transfer member. The transfer bias voltage is determined based on a current value acquired when the test voltage is applied. If a pre-set condition is satisfied, a pre-set adjusting value is added or subtracted.

Description

technical field [0001] The present invention relates to a contact transfer type image forming apparatus having a photosensitive drum and a contact transfer unit disposed in contact therewith. [0002] This application claims the priority of Japanese Patent Application No. 2006-214238 filed on August 7, 2006, the entire content of which is incorporated herein. Background technique [0003] In this type of image forming apparatus, the resistance value of the transfer roller as a contact transfer unit changes with environmental conditions such as temperature and humidity. In view of this, conventionally, a test voltage is applied to the transfer roller, and the transfer bias is set with reference to a predetermined function or a lookup table based on the current value and temperature at that time. [0004] In this prior art, according to the above-mentioned structure, it is possible to set an appropriate transfer bias regardless of whether the environmental conditions change o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16G03G15/00G03G21/18G03G21/00
CPCG03G15/1675G03G15/50G03G2215/00409
Inventor 笹井隆博
Owner MURATA MASCH LTD