Image forming device and controlling method thereof

Details Image forming device and controlling method thereof Image forming device and controlling method thereof

2007-12-25

2007-12-25

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

C399S069000

Reexamination Certificate

active

11265547

ABSTRACT:
The temperature “t” sensed at the end in the longitudinal direction of a heater is compared with a threshold Th and, based on the comparison result, the print speed (throughput) is controlled. The threshold Th is switched according to a predetermined condition. For example, whether the number of times the throughput reduction, which switches the print speed to a lower speed, is executed has reached a predetermined number is used as the predetermined condition. Alternatively, whether the small-size-paper passing ratio is higher than a predetermined value is used as the predetermined condition. This prevents grease runoff, provides good slidability between a fixing film and the heater, solves problems of improper paper conveyance, sliding sound generation, and improper fixing, and improves the durability of a fixing device.

REFERENCES:
patent: 6791671 (2004-09-01), Hayashi et al.
patent: 2003/0156853 (2003-08-01), Fukutani
patent: 2004/0190924 (2004-09-01), Iwasaki et al.
patent: 2003-330290 (2003-11-01), None

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