Imaging method and device

Abstract

An image forming apparatus that is capable of forming an appropriate image even on a special transfer sheet, such as a thick and rigid transfer sheet (e.g., a cardboard and an envelope) and a long transfer sheet, etc. In the image forming apparatus, when the thick and rigid transfer sheet is used, a transfer bias applied to first and second transfer devices is increased by about 10 to 30% compared to that applied when a normal transfer sheet is used, and a temperature of fixing rollers is increased by about 10 to 30% compared to that when the normal transfer sheet is used. When the long transfer sheet that is longer than a circumferential length of a second image bearing member is used, an image transfer onto the second image bearing member is prohibited. In addition, the temperature of the fixing rollers is increased by about 10 to 30% compared to that when the normal transfer sheet is used.

Description

technical field [0001] The present invention relates to a method and apparatus for forming images on both sides of a recording medium. Background technique [0002] 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) is transferred to the back of the paper for fixing. [0003] In the case of recording on both sides as described above, there are many problems in ensuring the reliability of paper transportation due to the switching of the paper transportation direc...

AI Technical Summary

Problems solved by technology

[0010] However, in the above devices, it is sometimes necessary to use special paper

[0011] For example, in the case of special paper such as thick paper, if the image is formed as in the case of normal paper, it is difficult for the paper to pass through the conveying path, and paper bending, paper jams, or problems in image density or fixability may occur. Problems such as low image quality

For this problem, the devices described in the above-mentioned publications have not considered

[0012] In addition, when the intermediate transfer belt is used as the second image carrier and can be recorded on both sides, when special paper such as long recording paper is used, there is a problem of how to deal with long image data exceeding the circumference of the intermediate transfer belt.

[0013] In addition, when fixing long paper as special paper, there are problems such as lowering of the fixing temperature, correspondence between the paper feed unit and the paper discharge unit for long paper, and the simplification of the method of making the recording paper long paper into the information input device.

For the above-mentioned problem, the devices described in the above-mentioned publications do not involve

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