Image forming apparatus with loop control

Details Image forming apparatus with loop control Image forming apparatus with loop control

2011-05-10

2011-05-10

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Having temperature or humidity detection

C399S043000, C399S068000

Reexamination Certificate

active

07941063

ABSTRACT:
An image forming apparatus is provided, which prevents occurrence of conveying malfunction or image failure due to variation of conveying speed caused by endurance of a fixing unit or a conveying unit, variation of using environment, or a type of a recording material. The image forming apparatus includes: a fixing unit for heating and fixing a toner image on a recording sheet (P); a secondary transferring portion for conveying the recording sheet (P) to the fixing unit; a loop sensor for detecting a degree of a loop of the recording sheet (P) generated according to a speed difference between a conveying speed of the fixing unit and a conveying speed of the secondary transferring portion; a CPU for controlling the conveying speed of the fixing unit; a fixing deliver sensor for detecting a used amount of the fixing unit; and an EEPROM for storing information on the used amount of the fixing unit detected by the fixing deliver sensor. The CPU controls the conveying speed of the fixing unit based on the information of the used amount of the fixing unit stored in the EEPROM and a detection result of the loop sensor.

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International Preliminary Report on Patentability dated Mar. 2, 2010, in counter International Patent Application No. PCT/JP2008/066014.

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