| 摘要 |
PURPOSE:To detect abnormality of each driving part in its early stage while the device is usable and to use the device in a normal driven state at all times by detecting and comparing the load torque of each driving part of the image forming device with load torque stored in a storage means and thus monitoring the driving parts. CONSTITUTION:A motor 30 for tray elevation, a paper feed motor 20, a reverse motor 21 for form inversion, a developing motor 11 and a main motor 10 are equipped with control parts 13 - 17 respectively and they are connected to the control part 9 consisting of a microcomputer CPU by a control signal line l1 and a load current detection monitor line l2. As the load torque of each motor is larger and larger, the voltage E0=IR at the terminal (m) part of the motor is larger and larger. The value of the voltage E0 and a value E'0 stored in a ROM 19, i.e. a value at which a driving part becomes unable to operate are compared by the control part 9 with each other and when the set value E'0 is exceeded, a display controller 18 displays the abnormal state on a display part 12 early. |
