| 摘要 |
<p>PURPOSE:To miniaturize a driving motor and to lighten its load by separating a tape drawing member from a driving system and pressing the member only with weak spring force of a toggle link mechanism at the time of pressing the member. CONSTITUTION:Under the final pressing state, a semicircular-arcuate gear of a gear lever 36 is released from meshing with a cam gear 31, and moreover, a follower pin of a toggle link 51 is also positioned at an end protrusion part 33e out of regulation of a linear cam part 33a. Consequently, spring force of a spring coil 56 is worked for pressing the toggle links 51 and 54 the gear levers 36 and 41 the tape drawing members 44 and 47. That is, a pressing system of the tape drawing members and the driving system including the gear 31 are separated from each other. At the time of unloading, the follower pin of the link 51 is controlled by the cam part 33a, while the links 51 and 54 are brought back to a click point 33c against energizing force of the coil 56. When the follower pin of the link 51 is beyond the point 33c, the spring force of the coil 56 is energized in the direction of unloading, so that no burden is imposed on the gear 31, but the gear 31 is rather encouraged.</p> |
