| 摘要 |
PURPOSE:To reduce the cost while using switching electric signal of small output and to prevent a contact defect in a device for rotating normally or reversely a motor having relatively large output. CONSTITUTION:When an exciting coil 7 is energized, the attracting force of a magnet 8 is cancelled, and a lever 2 is rotated clockwise around a supporting shaft 3a as a center. Thus, a rotational shaft 5 driven by a DC motor B and an eccentric rotational wheel 4 are contacted under pressure, and a changeover switch 1 is reciprocated back and force through a gear 4b and a rotary cam 3b. When the wheels 4 are rotated and a gear 3 rotates by half, the switch 1 is switched at electric switches 1a, 1b. At this time, since the motor B is temporarily deenergized, a control rectifier 11 is interrupted. Simultaneously, contactless switches 9a, 9b are alternately closed by the projection 3d of a soft disc 3c integral with the gear 3. |
