Fixing device having a fixing temperature switching mechanism, m

Details Fixing device having a fixing temperature switching mechanism, m Fixing device having a fixing temperature switching mechanism, m

1998-03-24

1999-05-04

Lee, S.

Electrophotography

Control of electrophotography process

Control of fixing

G03G 1520

Patent

active

058995986

ABSTRACT:
A microcomputer control section is such that, when switching is mode from a plain sheet mode to a sheetboard/OHP mode by the operation of a corresponding keys on an operation panel, the microcomputer control section changes the control temperature of an upper roller to an equivalent bit value so as to vary that control temperature from 150.degree. C. to 160.degree. C. during which time the microcomputer control section, confirming the surface temperature of an upper roller from a detection signal of a sensing section through an A/D conversion section, turns an upper lamp heater ON through a lamp control section if the surface temperature of the upper roller is below 155.degree. C. and, effecting continued confirmation of the surface temperature of the upper roller from the detection signal of the sensing section through the A/D conversion section, turns the upper lamp heater OFF through the lamp control section when the surface temperature of the upper roller increases above 160.degree. C., so that a sheetboard/OHP sheet-ready (copyable) state is displayed on a liquid-crystal display section on an operation panel.

REFERENCES:
patent: 5075732 (1991-12-01), Menjo
patent: 5408301 (1995-04-01), Tokishige et al.
patent: 5768655 (1998-06-01), Yoshino et al.

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