| 摘要 |
PURPOSE:To decrease the number and weight of parts by using a drive motor, a worm wheel, and a prepressing spring. CONSTITUTION:A housing 6 engraved with helical internal screws is mounted to the position in proximity of the torque meter outside reel 2 in a cassette case 1, and a drive motor 5 engraved with helical screws 7 is housed in the outside circumference of the body. In addition, the shaft end of the drive motor 5 is made as a worm shaft 8, which is meshed with the tooth part 10a of a worm wheel 10 pivotally fitted between the grasping parts 9 and 9 fixed to the end of the motor body. One end 12a of a prepressing spring 12 fitted to a pin shaft 11 is engaged from above with the recessed part in the center of the tooth part of the worm wheel 10. Then, while the power is supplied to the motor 5, the motor body revolves and advances so that the worm wheel 10 drives the torque meter outside reel 2. While no power is supplied, the motor body and the worm wheel 10 are reset by the prepressing spring 12. Hence, the need for any clutching solenoid is eliminated and the desired object is achieved. |
