| 摘要 |
PURPOSE:To increase the change-over accuracy of a band change-over mechanism, by providing a pair of restoring springs to hold a restoring state for a pair of working plates. CONSTITUTION:The band change-over switch 7 is selecting the band B, and at the same time an optional operation member 1a for band A is slided. Thus a part 1' of the operation member acts on the slope edge of the cam piece 6a to move the 1st working plate 3a to the right direction against the restoring spring 10a. As a result, the mover 7' is depressed to the right direction via the pressing piece 8. Thus the switch 7 changes from band B to A. Under these conditions, an optional operation member 1b for band B is slided. Thus a part 1' of the operation member acts on the slope edge of the cam piece 6b to move the 2nd working plate 3b to the left direction against the restoring spring 10b. As a result, the mover 7' is depressed to the left direction via the pressing piece 9. Thus the switch 7 changes from band B to band A. |
