Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1992-09-16
1993-05-18
Olszewski, Robert P.
Sheet feeding or delivering
Feeding
By means to convey sheet
271312, 346138, B65H 502
Patent
active
052113914
ABSTRACT:
A sheet removal apparatus for unloading a sheet from a hollow drum mounted for rotation about its axis and having a vacuum provided to the interior thereof and to first and second sets of vacuum openings through the surface of the drum. The sheet is arranged to overlie and close the first set of vacuum openings with the second set of openings extending substantially parallel with an edge of the sheet and comprising only a small portion of the total number of vacuum openings through the drum. An exit blade is disposed adjacent the drum and has an edge proximate the drum that extends substantially parallel to the edge of the sheet and forms an acute angle with the drum surface with the proximate edge of the blade closely adjacent the apex of the angle and parallel with the edge of the sheet. When the drum is rotated to a sheet removal position, the first set of vacuum openings lies beneath the acute angle when the edge of the sheet is disposed on the opposite side of the apex. The improvement comprises spacing the proximate edge of the exit blade sufficiently close to the surface of the drum that while the exit blade clears the sheet disposed on the drum, the vacuum drawn through the second set of vacuum openings creates an area of relatively high pressure air at the apex whereby air is forced past the apex with sufficient force to lift the edge of the sheet from the surface of the drum.
REFERENCES:
patent: 3837640 (1974-09-01), Norton et al.
patent: 3955813 (1976-05-01), Edwards
patent: 4157178 (1979-06-01), Ollenaick
patent: 4237466 (1980-12-01), Scranton
patent: 5090685 (1992-02-01), Danon et al.
Auer Scott L.
Grube Donald F.
Heizyk Dennis W.
Kerr Roger S.
Eastman Kodak Company
Milef Boris
Olszewski Robert P.
Randall Robert L.
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