| 摘要 |
PURPOSE:To use an electromagnet for trigger to obtain large driving force with a small current by providing one cam gear with a cam portion for taking out power, a click engaged with a lock member and a cam portion for restoring the lock member. CONSTITUTION:An electromagnet 15 has a magnet 9 magnetized in such a manner that forward ends 10a, 11a of fixed iron cores 10, 11 are N and S poles, respectively, wherein when magnetic field is generated to cancel the magnetic force of the magnet 9 by applying an electric current to a coil 12, a movable iron core 13 is released. The thus constructed electromagnet 15 is used in a cam mechanism, and while an electric current is not supplied, one end 14a of a lock arm 14 is engaged with a click 2d of a cam gear 2 by attraction force of the magnet 9 to be retained in the lock state. When an electric current is supplied to erase the attraction force, the lock arm 14 is turned by a spring 16 to release the above lock state, so that the rotation of a gear 1a is transmitted to a cam gear 2. After the gear 2 is rotated in a fixed-degree arc, the movable iron core 13 is restored to its initial position by the action of a cam portion 2e. |
