| 摘要 |
<p>PURPOSE:To enhance the resolution of a mode position, and to improve mode detecting precision by providing an engagement canceling means to cancel intermittently engagement between a mode setting member and a mode detecting means. CONSTITUTION:A racing recessed part 10i with no gear for constituting the engagement canceling means to cancel intermittently the engagement between a ring gear 10 as the mode setting member and a rotary switch 30 as the mode detecting means is provided. Then, at a prescribed section in a series of the operation of the gear 10 where a mode need not be detected, the engagement with the switch 30 can be canceled. Accordingly, even in the case that plural mode positions are located close to each other, the arranging interval of contacts in the switch 30 can be made large, and influence the dimensional accuracy of a contact pattern gives to mode detection can be suppressed low. Thus, the high precision of the mode detection can be attained.</p> |
