| 摘要 |
<p>PURPOSE:To release an operation between an operating member executing a head shift operation and a cam on the way of the head shift operation, by providing a member locking a control member when the operating member is at pressing position of a head, and energizing the operating member to the operating direction at the lock. CONSTITUTION:A cam 5 is turned by loading a cassette, an intermittent gear 3 unified with the cam 5 in one body is turned and intermeshed with a gear 2 rotated by a motor to shift left a switching member 7. When a roller 10 overrides a maximum point of the cam 5, the intermesh between the gears 3 and 3 is detached and a control member 22 is pushed downward until an operating member 16 reaches the lower limit (pressing position of the head) and locked with a lock member 32. Since a fulcrum 23 of the control member 22 keeps a slight gap from the upper end from a groove hole 21 in this locking state, the tensile force of a spring 27 is effectively exerted on the member 16 and the member 16 can surely be held at the lower end position, that is, the pressing position of the head.</p> |
