| 摘要 |
PURPOSE:To calculate the necessary air capacity of a copying machine main body without setting a temperature detecting element specially and to control the copying machine main body and a motor external frame to constant temperature at low cost by detecting the output voltage from a rotating speed detecting element fitted to a motor. CONSTITUTION:The rotating speed detecting element is provided to the flat motor for driving a copying machine driving system, and the output voltage 34 from a Hall element is amplified by an amplifier 35 to such a level that it can be inputted to a CPU circuit 36, which controls a fan driving circuit 37. The time or air capacity for cooling the equipment main body or motor is adjusted and it is controlled to constant temperature, thereby fixing the Hall element output voltage at a proper level. Consequently, the temperature of the equipment main body, etc., can be detected only by knowing the voltage of the Hall element to eliminate the need to increase the number of components by fitting a temperature detection sensor specially. |
