Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1996-03-27
1998-06-02
Milef, Boris
Sheet feeding or delivering
Feeding
By means to convey sheet
271196, 355104, 355110, 355 73, 355 91, 1013891, 346138, B65H 502
Patent
active
057588740
ABSTRACT:
A vacuum drum apparatus on which a mask is mounted having a resilient surface and a plurality of holes suitable for a substrate of a given size. The vacuum drum apparatus is balanced for rotation at high speeds by attaching a counterweight to the mask. The drum is a circular cylinder perforated with an array of holes. The drum has flat surfaces on its outer surface that are used to mount the mask and the substrate on the drum. A hollow chamber within the drum is connected to a controlled pressure source for providing a vacuum. The mask may be magnetically attracted about the outer surface of the drum. Thus, the mask may be made of a flexible ferromagnetic sheet. The mask may also be staged on the drum with other mechanical type entanglements. The mask is preferably elastomeric and may include an inextensible layer.
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Milef Boris
Optronics International Corporation
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