Image forming apparatus which can discriminate frequency of imag

Details Image forming apparatus which can discriminate frequency of imag Image forming apparatus which can discriminate frequency of imag

1993-03-24

1994-06-14

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

219216, 355204, 355208, 355289, G03G 1520

Patent

active

053214781

ABSTRACT:
An image forming apparatus includes an image forming unit for forming an undeveloped image on a recording material, heating fixing unit for fixing the undeveloped image on the recording material by heating. The heating fixing unit includes a heating member heated by a heater, a temperature detector for detecting a temperature of the heating member, and a current-supply control unit for controlling current supply to the heater so that the temperature detected by the temperature detector is maintained at a predetermined control temperature in a standby state. The apparatus further includes an electric-power reduction unit for reducing or cutting electric power supplied to the heater when an image forming signal is not input for a predetermined time period after the completion of an image forming operation, and a discriminating unit for discriminating the frequency of image forming operations. The electric power reduction unit sets the predetermined time period variably in accordance with frequency of image forming operations discriminated by the discriminating unit.

REFERENCES:
patent: 3851144 (1974-11-01), Hutner
patent: 3916146 (1975-10-01), Hutner
patent: 4006985 (1977-02-01), Hutner
patent: 5241349 (1993-08-01), Nagasaka

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