| 摘要 |
PURPOSE:To stably control a moving unit, by losing the weight of the moving unit moving in the vertical or slanting direction, with the tensile force of a spring plate. CONSTITUTION:A stator frame is fitted on a motor fixed way, and a mover frame is butted to the open end section. A guide rod is penetrated into the sleeve bearing of the mover frame, and the mover frame interior is provided with a mover. Then, by conducting stator windings electrically, the mover is vertically and linearly moved in parallel with a stator. Then, at the lower end of the mover, a constant-tension spring unit 9 for losing the weight of the mover is fitted. The unit 9 is composed of a bobbin 13 supported rotatably by a unit frame 10 fixed on the lower end face of the mover, a spring plate 14 lap-wound on the bobbin, and position detecting means 18, 19 for detecting the elongation (return) of the spring plate. Then, the return force of the pulled- out spring plate 14 is equal to the gravity with addition of the weight of the mover, and by the position detecting means 18, 19, the position and the moving speed can be transmitted to the controlling section side. |
