| 摘要 |
<p>PURPOSE:To eliminate the operation of over load to abnormal use when a cassette is inserted and to protect a driving part by turning a first and second engaging parts more than equally with the almost horizontal part of an L-shaped guide groove in a side plate in the manner of stroke. CONSTITUTION:When a cassette holder 1 is rapidly inserted to the termination of a horizontal stroke LS in L-shaped guide grooves 3 and 3' of the side plate, a clutch disk 26 is turned. However, an opening angle beta of half moon-shaped long holes 27 and 27', which are provided in the clutch disk 26 at a fixed angle, is larger than width beta' of projections 28 and 28', which are provided in a worm wheel 29, and difference beta-beta' is set more than the horizontal stroke LS of the L-shaped guide grooves 3 and 3' provided in side plates 2 and 2'. Accordingly, the end faces of the long holes 27 and 27' in the clutch disk 26 are not in contact with the projections 28 and 28', which are formed in the worm wheel 29, with pressure and the worm wheel 29 is not turned. Thus, it is prevented that the over load is applied to a clutch means part and a motive force member, etc., linked to the clutch means part and that one part of a driving system is damaged.</p> |
