| 摘要 |
The invention relates to a magnetic holding device including an engagement surface to engage a workpiece, a plurality of permanent magnets having their magnetic axes substantially aligned with the plane of the engaging surface, and at least one magnetic switching unit to alter the direction of the magnetic field from the permanent magnets, wherein the engagement surface is formed by a continuous homogeneous plate. The continuous plate is composed of a ferromagnetic material preferably with pole pieces to separate the permanent magnets. The lower surface of the plate is adapted so as to locate the permanent magnets. And may be provided with accurately milled slots into which the permanent magnets are securely located.
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