| 摘要 |
<p>PURPOSE:To prevent malfunction such as two cam gears being driven at the same time by blocking either of the gears from being driven by a rib even if the two cam gears tend to be driven simultaneously. CONSTITUTION:Circular-arc shaped ribs are provided respectively to two cam gears 1, 2, and the cam gears 1, 2 are arranged while being overlapped partly so that the circumferences drawn by the circular-arc shaped ribs are tangent to each other. In energizing solenoids 4, 5 simultaneously, the cam gears 1, 2 are driven to rotate clockwise at the same time and the ribs of the cam gears 1, 2 collide with each other. Suppose that the energizing force of an ejecting spring 9 is larger than that of an ejecting spring 8, the torque of the cam gear 2 is larger than that of the cam gear 1, the cam gear 2 is rotated so that the cam gear 1 is pushed back from the state where both the ribs abut against each other. Thus, the cam gear 1 is restored to its home position where its tooth missing part is opposed to an FW gear 3, the energizing of the solenoid 4 is released, and when the drive of the cam gear 2 is finished, the pin of the solenoid lever 6 is engaged with the step of the cam. Thus, the cam gear 1 is not rotated.</p> |
