| 摘要 |
<p>Disclosed herein is a magnetic substance holding device that characterized by comprising: a base; a first pole piece having a holding face; a second pole piece having a holding face, being movable between a first and a second location; a primary permanent magnet;a coil wound around at least one of the first and the second pole piece; and a control device. The control device applies current to the coil to magnetize at least one of the first pole piece and the second pole piece to thereby control the second pole piece to be at the first location at the time of holding the workpiece so that the holding face of the second pole piece comes in contact with the workpiece, and the second pole piece to be at the second location at the time of detaching the workpiece so that the holding face of the second pole piece is spaced apart from the workpiece.</p> |
