Mechanism for separating lowest sheet in stack of flexible plastic sheets, uses jet of air to lift stack up while lowest sheet is drawn out

摘要

The mechanism forms part of a machine which processes sheets of smooth airtight plastic, e.g. polyethylene or polypropylene. A rotating assembly below a hopper has a suction head (33) which grips the forefront of the lowest sheet (10) in a stack (12). As the suction head peels the front edge (55) down, a jet (61) of compressed air forms a cushion (62) to lift up the remaining stack and to allow the sheet to be drawn out.