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Vacuum die mount

  • US 4,878,407 A
  • Filed: 05/17/1988
  • Issued: 11/07/1989
  • Est. Priority Date: 05/01/1986
  • Status: Expired due to Term
First Claim
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1. Die mounting apparatus, comprising:

  • a rotatable die cylinder having a die mounting surface;

    means for connecting an interior of said die cylinder to a source of vacuum;

    at least one valve unit mounted in said die cylinder, said valve unit having an actuating member protruding above said die mounting surface when the valve is closed, depression of said actuating member opening the valve for placing said die cylinder interior in communication with said die mounting surface;

    a rigid die mounted on said die mounting surface over said actuating member and being held on said surface in use by vacuum applied below said die through said valve unit, said actuating member being depressed by said die;

    a seal sandwiched between said die and said die mounting surface, said seal defining a closed area on an underside of said die and to which area the vacuum is in use applied; and

    said seal comprising at least one elongate element having a lengthwise direction and a width transverse to said lengthwise direction, said element having a bubble formed intermediate its width and extending in said lengthwise direction, said bubble being flattened between said die and said die mounting surface when said vacuum is applied to said closed area.

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