Fixing temperature control unit

Abstract

Abstract PURPOSE: To perform sure fixing irrespective of the quality of paper by providing plural copying switches which control the temperature of the fixing part. CONSTITUTION: Two copy switches 3-a, 3-b are provided and are connected to the terminals K 1 , K 2 of a reference voltage generating circuit 18. Then, when the copy switch 3-a is pushed in the case of thin paper, the ON signal is applied from a triac gate control circuit 19 by the output of a comparator 17 when the comparison voltage V 1 from a thermocouple 15 is lower than a reference voltage VN, by which AC power source is supplied to a heater 13 and fixing is accomplished at the specified preset temperature. In the case of thick paper, the push of the switch 3-b causes the reference voltage VN corresonding to the thickness to be inputted in place of the previous reference voltage to the comparator 17, and fixing is accomplished at the specified preset temperature for the thick paper. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Fukusaburo Ito

Bibliographic Details