Image forming apparatus and method of controlling the same

Abstract

An image forming apparatus includes a first rotator by which one surface of a paper is subjected to image transferring, image fixing, or other processings, a second rotator which presses the paper against the first rotator from the other surface of the paper, a space changing unit which changes a space between axial cores of the first rotator and the second rotator, a feeding unit which feeds thepaper between the first rotator and the second rotator, and a control unit which adjusts a driving timing of the space changing unit in accordance with the driving of the feeding unit, wherein when the paper is thinner than a set value, the control unit makes the paper enter between both the rotators in a state where the second rotator is pressed against the first rotator, and when the paper is equal to or thicker than the set value, the control unit controls to press the second rotator against the first rotator at a timing where a distal end of the paper passes through between both the rotators.

Description

[0001] Cross References to Related Applications [0002] This application is based on application No. 2009-240671 filed in Japan, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to imaging devices. As the image forming apparatus, various devices such as a single-function copier, a single-function facsimile, a printer, a plotter, and a compound machine having multiple functions such as a copy function, a facsimile function, and a scan function are included. Background technique [0004] Image forming apparatuses such as single-function copiers and multifunction machines generally include a secondary transfer section that transfers a toner image to paper and a fixing section that fixes the image to paper. In the case of a chromatic image forming apparatus, the secondary transfer section includes a secondary transfer belt (intermediate transfer belt), a belt drive roller, and a secondary transfer roller....

AI Technical Summary

Problems solved by technology

Therefore, there is concern about fusing failure due to damage to the heat roller and / or pressure roller caused by the edge of the paper and depressions remaining

[0011] With the conventional technology disclosed in Japanese Unexamined Patent Publication No. 2005-316320 and No. 2008-33033, although the interval between the rollers can be changed according to the thickness of the paper, the paper is only in the state where the interval is previously set. is fed between the rollers

Therefore, the damage to the rubber layer and the above-mentioned failures that remain in the depressions cannot be eliminated

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