Control apparatus for fixing unit having plural heaters

Details Control apparatus for fixing unit having plural heaters Control apparatus for fixing unit having plural heaters

1997-05-29

1999-12-28

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347102, 347212, 399 69, 399330, 399335, 219216, 219492, B41J 2385, G03G 1520, H05B 100

Patent

active

06008829&

ABSTRACT:
A heater of a fixing unit of a recording apparatus is constructed by a main heater and a sub heater. When the apparatus is in a standby mode, each heater is first turned off. When a temperature of the fixing unit is equal to or lower than a heating start temperature of the sub heater, the sub heater is turned on. After that, when the temperature of the fixing unit reaches a heating stop temperature of the sub heater, the sub heater is turned off. After that, when the temperature of the fixing unit is equal to or lower than the heating start temperature, the main heater is turned on. After that, when it reaches the heating stop temperature of the main heater, the main heater is turned off. The above operations are repeated. In the recording mode, the order of the on/off periods in a control unit time of each heater is switched every period and the temperature control is executed, thereby reducing a flickering.

REFERENCES:
patent: 5220389 (1993-06-01), Kishimoto et al.
patent: 5334817 (1994-08-01), Nakamori et al.
patent: 5508797 (1996-04-01), Tonai et al.
patent: 5512993 (1996-04-01), Endo et al.
patent: 5671462 (1997-09-01), Toyohara et al.
patent: 5819134 (1998-10-01), Sato et al.
Patent Abstracts of Japan, vol. 012, No. 100 (P-683), Apr. 2, 1988, & JP 62-232674 (Sharp Corp.), Oct. 13, 1987.
Patent Abstracts of Japan, vol. 013, No. 314 (P-899), Jul. 18, 1989, & JP 01-084271 (Minolta Camera Co. Ltd.), Mar. 29, 1989.

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