| 摘要 |
<p>PURPOSE:To prevent the unnecessary trigger motion by performing the motion change driving and motion holding of a tape recorder by the rotation and stoppage holding of a cam gear with the positive and reverse electrification of a solenoid plunger. CONSTITUTION:The attraction type electromagnetic plunger 30 having the iron cores 31, 35 opposed to one pole of the magnet 25 with two magnetized poles which is integrally provided on the cam gear 21 having a tooth deletion part 23 and cam part 22 is provided. The cam gear 21 is rotated by the residency against the magnet of the iron core at the positive electrification of the attraction type electromagnetic plunger 30, driven with its rotation by bitting with a driving gear 26, the change lever engaged with the cam part is displaced and the member to be controlled is actuated. The cam gear is therefore stopped and held by the attraction force for the magnet of the iron core at the reverse electrification time of the electromagnetic plunger and the movable iron core 35 of the plunger is attracted. In this way the motion holding by the trigger motion and attraction force is surely performed to prevent the unnecessary trigger motion.</p> |
