| 摘要 |
<p>PURPOSE:To expand the use range by closing and exciting brake shoes with the elastic force of an elastic member, pinching a magnetostrictive element generating distortion by magnetization or a piezoelectric element generating distortion by the application of the voltage between them, and opening them against the exciting force with the extending/deforming force. CONSTITUTION:When the coil 18 of a brake 8 is excited and the magnetic field is formed around a magnetostrictive element 17, the element 17 is extended and deformed to spread both brake shoes 10 against the tensile force, tip pinching section 11 are separated from the friction face 6 of a moving piece 5, thus the braking of the moving piece 5 is released, and a rotary shaft 2 and the moving piece 5 are rotated by the driving force of a rotation driver 1. When the excitation of the coil 18 is cut off, braking is applied to the moving piece. The element 17 has excellent responsiveness, brake shoes 10 are closed immediately after the excitation of the coil 18 is cut off, and the moving piece 5 is stopped with precise positioning. The driving force of the rotary shaft 2 is not applied to the element 17 at the time of braking, thus this brake device can be used even when the rotation driving force is large.</p> |
