Method and apparatus for retaining one or more layers of sheet type work material on a support surface
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United States of America Patent
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-
Mar 28, 2000
Grant Date -
N/A
app pub date -
Jul 15, 1998
filing date -
Jul 15, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an apparatus for retaining one or more layers of sheet type work material on a permeable support surface, at least two vacuum manifolds are positioned under the support surface, each defining at least one vacuum inlet for drawing vacuum therethrough. Proportional control valves are coupled to the manifolds for selectively controlling the location and intensity of the vacuum being drawn, such that work material positioned on the support surface is held thereto by the vacuum drawn through the inlets and the support surface. The intensity of the vacuum is selectively controlled by the valves to concentrate vacuum in the area along the work material where a work operation is being performed.
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