| 摘要 |
PURPOSE:To effectively discriminate the operations at normal and abnormal times by starting a timer with a motor, forcibly interrupting the energization during a timer setting driving time at the abnormal time of a mechanical load and interrupting the energization by a limit switch at the normal time. CONSTITUTION:Since an antenna pawl 3f does not release a limit switch even if a switch 1 is operated in the state that an antenna motor is overlapped or competely locked, a lead switch 8b remains ON, a timer circuit 12 set slightly larger than the time required to operate the limit switch at normal time by the pawl 3f at the operating time limit by the completion of the discharge of a capacitor C3 is opened by a transistor TR4 at the time limit, a relay y is thus opened, and the motor is deenergized. When the timer circuit 12 is timed up, and capacitor C2 is discharged to inhibit the ON or the transistor TR1 during the time corresponding to the time constant of the resistor R4, and a trigger pulse is erased during this period, thereby preventing the erroneous starting of the timer circuit 12. |
