| 摘要 |
A frame counter comprising a counter wheel rotatable about an axis to change a frame count, and a counter actuator supported for movement in engagement with the counter wheel to rotate the counter wheel in a predetermined direction to change the frame count, is characterized in that the counter actuator is supported to be returned each time it rotates the counter wheel in the predetermined direction to change the frame count, and the counter wheel is supported to be non-rotationally displaced with respect to its axis to permit the counter actuator to be returned without reverse rotating the counter wheel to allow the frame count to remain unchanged. Preferably, the counter actuator when returned displaces the counter wheel off its axis to avoid reverse rotating the counter wheel. An anti-backup pawl engages the counter wheel to prevent reverse rotation of said counter wheel and is resilient to urge the counter wheel towards its axis.
|
