| 摘要 |
PURPOSE: To prevent vibrational noise due to tapping a bottom board caused by thrust backlash and rotation in the rotary shaft direction of a gear and to obtain a silent constitution as a driving force transmitting mechanism by biasing and energizing the gear in the transmitting mechanism for driving force that the force in the thrust direction of the rotary shaft is generated by an elastic means in the same direction as the force in the thrust direction of the rotary shaft of the gear. CONSTITUTION: In the case of transmitting the driving force of a motor from a driving gear 8 to a pulse gear 15, the force F1 from the driving gear 8 generates thrust to a tooth surface in terms of the constitution of a bevel gear. Namely, the rotational force F2 of the pulse gear 15 and the thrust F3 in the thrust direction of the rotary shaft are generated as the component force in the pulse gear 15. Since the pulse gear 15 is always pressed in the same direction as the thrust F3 by a coil spring 27 and abuts on the right-angle bent piece 2a of a motor bottom board 2, the pulse gear 15 itself does not rotate while moving in the thrust direction of the rotary shaft. Namely, the coil spring 27 prevents the thrust backlash and rotation in the rotary shaft direction of the pulse gear 15. |
