Electrostatic copying apparatus.

摘要

An electrostatic copying apparatus comprising a fixing device with an electrical heating element (406), a temperature detecting means (430) for detecting temperature at a predetermined position of the fixing device, a copying cycle signal producing means (438) for producing a copying cycle signal according to the performance of the copying cycle, a power supply switch (440), and control means for the electrical heating element and the power supply switch is provided. The control means (250) upon the closing of the power supply switch (440) energizes the electrical heating element (406) until the temperature detected by the temperature detecting means (430) reaches a first predetermined temperature T1. Thereafter, when the copying cycle signal is produced, said control means (250) controls the energization and deenergization of the temperature detected by the temperature detecting means (430) is the first predetermined temperature T1, and wherein when the copying cycle signal is not produced, said control means (250) deenergizes the electrical heating element (406), and turns off the power supply switch (440) when the temperature detected by the temperature detecting means (430) is lowered to a second predetermined temperature which is lower than the first predetermined temperature.