| 摘要 |
<p>A driving device for pressing means (3) of a sanding machine (4), said pressing means being arranged for exerting a working pressure (P3) on a workpiece (6), comprises pneumatic actuator means (11) associated with said pressing means (3), electric valve means (35) arranged for inducing said working pressure (P3) on said pneumatic actuator means (11) and electromagnetic driving means arranged for driving said electric valve means (35), said electromagnetic driving means is electromagnetic driving means having a pulse width modulation cycle (100; 100').</p> |
