| 摘要 |
<p>PURPOSE:To move two magnetic heads with a simple constitution, by controlling the reciprocation of the two magnetic heads between the forward moving position and the backward moving position to a magnetic tape with a means controlling a rotating angle of a single cam means. CONSTITUTION:In depressing a stop button at the forward moving mode, a cam means comprising a cam member 150 and a pressing roller 156 is driven clockwise, and when a pawl 180 is projected in a cam groove 152, the turning is stopped and the roller 156 retreats the 1st magnetic head to the 1st backward moving position during this time. In depressing the backward movement button, an idler gear 156 turns a reel shaft 97 counterclockwise, the tape runs the reverse direction, the cam means is turned counterclockwise, then the 1st magnetic head is moved to the 2nd backward moving position and the 2nd magnetic head is moved to the forward moving position to be contacted on the tape. In this case, a control means comprising a trigger magnet 26 and a force plate 182 controls the rotating angle of the cam means. Thus, with a simple constitution such that a single cam means is controlled with the control means, the magnetic heads are moved.</p> |
