Safety device for fixing heater

Details Safety device for fixing heater Safety device for fixing heater

1988-01-13

1989-01-31

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 30, 219216, 219510, G03G 1520

Patent

active

048019747

ABSTRACT:
Method and apparatus are provided for minimizing delay in the operation of a safety device in a device for thermally fixing an image to a paper medium. A safety device, such as a thermostat, is set to deactivate a heater unit if the temperature of the heater unit exceeds a first temperature value. If the temperature of the thermal unit exceeds a second temperature value lower than the first temperature value, a heat exhausting device, such as a fan, is turned off. Shutting off the heat exhausting device stops cooling of the heater, thus decreasing the time elapsed before the safety device can detect the first temperature value.

REFERENCES:
patent: 4541708 (1985-09-01), Shigenobu

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