Image forming apparatus controlling contact pressure between image bearing member and transfer device
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United States of America Patent
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Feb 20, 2018
Grant Date -
Sep 15, 2016
app pub date -
Mar 11, 2016
filing date -
Mar 12, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An image forming apparatus is operable in a mode of forming an image using only a part of image forming stations. In the mode, a developing device contacts an image bearing member in the part of the image forming stations, and the developing device is spaced from the image bearing member in the rest of the image forming stations. The contact pressure between the image bearing member and a transferring device is made smaller in the rest than in the part. The image forming operation in the mode is executed while the image bearing members of the part and the rest are rotated. A controller is configured such that when the operation in the mode is continuously executed for a time period longer than a predetermined period, the contact pressure in the rest is made larger than the above-mentioned smaller contact pressure.
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