Image forming device and image forming method

An image and image-carrying technology, which is applied to the electric recording process using the charge pattern, equipment and instruments for the electric recording process using the charge pattern, etc., can solve problems such as lowering of the fixing temperature, paper clogging, and failure to consider the device, so as to prevent Effects of image shift, good transferability, and improved transportability

CN100495236CInactive Publication Date: 2009-06-03RICOH KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2009-06-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method and apparatus for forming image on two side of a recording medium that is capable of forming an appropriate image even on a special transfer sheet, such as a thick paper or an envelope. The transfer current applied to a first transfer means 21 and a second transfer means 22 is increased by 10-30% from that at the time of using ordinary paper, and also the temperature of fixing rollers 18 and 19 is raised by 10-30% from that at the time of using the ordinary paper. In the case of feeding longer paper than the circumferential length of an intermediate transfer belt 10 from a roll paper feeding device 300, the transfer of a toner image to the intermediate transfer belt 10 is inhibited. Also, in the case of the long-sized paper, the temperature of the fixing rollers 18 and 19 is raised by 10-30% from that at the time of ordinary paper. This invention can prevent defects of tranfer printing and fixation and improve the quality of the image even in case of using the thick paper, envelope, longer paper and special paper.
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Description

[0001] This application is a divisional application of the invention patent application with the application number 01137194.3, the application date is October 24, 2001, the applicant is Ricoh Co., Ltd., and the invention title is "image forming method and device thereof". technical field

[0002] The present invention relates to a method and apparatus for forming images on both sides of a recording medium. Background technique

[0003] Some image forming apparatuses such as copiers, printers, and facsimiles can form images on both sides of a recording medium (hereinafter simply referred to as “paper” for simplicity). In the conventional image forming apparatus capable of double-sided recording, the following method is generally used: the image (developed image) formed on one side of the image carrier is transferred to paper, fixed, and then the paper is turned over by a reversing passage or the like. , the paper is fed again, and the image on the other side (developed image...

Examples

Embodiment Construction

[0128] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0129] FIG. 1 is a schematic sectional view of a printer as an example of an image forming apparatus to which the present invention is applied.

[0130] In the printer 100 shown in the figure, a photoreceptor drum 1 serving as a first image carrier is disposed approximately in the center of the device. Around the photoreceptor drum 1, a cleaning device 2, a static elimination device 3, a charging device 4, and a developing device 5 are arranged. In the figure, an exposure device 7 is provided above the photoreceptor drum 1 , and laser light L emitted from the exposure device 7 is irradiated onto the photoreceptor 1 at a writing position between the charging device 4 and the developing device 5 .

[0131] In this embodiment, the photoreceptor drum 1, the cleaning device 2, the electricity removing device 3, the charging device 4, the developing device 5,...