| 摘要 |
PURPOSE:To enable speed up of head driving while using a ratchet by engaging the projected part of a stopper pawl with a driving pawl only when driven by a releasing device, and separating it from teeth of the ratchet by turning the driving pawl. CONSTITUTION:A releasing lever 160 is pivoted by a pivot 161 on a base plate 111, and energized counterclockwise by a spring between it and a pin 162. When force is applied in the direction shown by the arrow mark 164, the tip 165 of the releasing lever 160 presses the projection 166 of a stopper pawl 156 and rotates it counterclockwise. Consequently, engagement of the stopper pawl 156 with the ratchet 134 is released. At the same time, the projection 167 of the stopper pawl 156 presses the projection 168 of the driving pawl 133 and releases engagement of the driving pawl 133 and ratchet 134. Consequently, the ratchet 134 becomes free, and rotated clockwise by a pring 147, and a projection 150 comes into contact with a stopper 151. Under this state, a cam 135 and a counter driving pin 142 return to initial position. |
