Photocopying – Contact printing – Light boxes
Patent
1988-08-16
1991-02-19
Braun, Fred L.
Photocopying
Contact printing
Light boxes
219216, 219497, 355282, G03G 2100, G03G 1520
Patent
active
049948520
ABSTRACT:
An image forming apparatus for electrophotographically producing a toner image on a recording sheet medium, a toner image fixing assembly which includes a heater unit having an operative condition to thermally fix the toner image on the recording sheet medium, a power supply circuit for electrically energizing the heater unit through a switch, a microprocessor unit for controlling the power supply circuit, the microprocessor unit being operative to supply to the power supply circuit a control signal effective to actuate the switch to cyclically close and open for a predetermined period of time for the purpose of inspecting the heater unit for any malfunction, a detecting element directly responsive to the condition of the heater unit and operative to produce a signal indicative of the detected condition of the heater unit, a malfunction detector network responsive to the signal from the detecting element, the malfunction detector network being operative to produce a malfunction signal indicating a malfunction of the heater unit when, in the presence of the control signal from the digital control network, the signal from the detecting element indicates that the heater unit is continuously in operation, and a disabling device for forcibly disabling the power supply circuit in response to the malfunction signal from the malfunction detector network.
REFERENCES:
patent: 4144835 (1979-03-01), Fukase et al.
patent: 4439143 (1984-03-01), Hanamoto et al.
patent: 4585325 (1986-04-01), Euler
patent: 4675777 (1987-06-01), Watrous
patent: 4745430 (1988-05-01), Tsuchiya
Matsuuchi Yasuyuki
Nagata Kenzo
Braun Fred L.
Minolta Camera Kabushiki Kaisha
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