| 摘要 |
<p>PURPOSE:To actuate a working member which performs head press-contacting action so that it does not exceeds the head press-contacting position until it reaches there and to lock the member assuredly at that position, by energizing the working member in its working direction by means of an energizing member while a control member is locked by a locking member. CONSTITUTION:When a cassette is loaded, a control member 22 is pushed down consecutively even after a working member 16 reaches the lower end position, i.e., the press-contacting position of a head 19 with the driving of a cam 5. The locking state under which an upper slanted surface 26 touches a projection 34 of a locking member 32 is held by the holding power of a holding plunger 40 and the tensile force of a spring 38. In this locking mode, a fulcrum 23 of the member 22 is positioned with a slight gap secured from the upper end of a groove hole 21. Thus the tensile force of a spring 27 acts effectively on the member 16. As a result, the member 16 is assuredly held at the lower end position, i.e., the press-contacting position of the head 19.</p> |
