| 摘要 |
<p>PURPOSE:To improve the operability of an operating member for variable speed reproduction which is used for an editing job, etc., by pressing a cam shaft to an inner face of a heart cam hole of a rotary dial plate and resetting automatically the dial plate to a prescribed angle position. CONSTITUTION:An outside dial operating ring 220 is turned by +theta1 deg. and a cam shaft 231 is set relatively at a position shown by broken lines. In this case, the revolving torque component force of the ring 220 is in proportion to the component force of elasticity applied to a slide plate 230 by a twist coil spring at a contact between the shaft 231 and the inner face of a heart cam hole 222. While the shaft 231 is reset to the tip position of the hole 222 by the elastic force of the twist coil spring when no revolving torque acts on this ring 220. Then a plate 221 of the ring 220 is reset automatically to a prescribed rotary angle position. Thus it is possible to improve the operability of an operating member for variable speed reproduction which is used to an editing job, etc.</p> |
