| 摘要 |
A vacuum hold-down device comprising a base member ( 1 ) and a separate workpiece support ( 8 ) which co-operate to define a vacuum chamber. The device further comprises a venturi ( 15 ) having an inlet port ( 7 ) for connection to a source of pressurized fluid, an outlet ( 9 ) for fluid from the venturi, and a fluid connection ( 19, 5 ) from a low pressure region of the venturi ( 15 ) to the inside of the vacuum chamber, for providing a partial vacuum therein. The partial vacuum will hold the base member ( 1 ) and the workpiece support ( 8 ) together to maintain a peripheral seal therebetween. The workpiece support ( 8 ) is provided with securing means ( 16 ) for securing a workpiece ( 10 ) thereon. The invention also provides a vacuum hold-down system comprising the base member ( 1 ) and a plurality of interchangeable workpiece supports ( 8 ).
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