Method for unstacking sheets stacked in a feeder

Details Method for unstacking sheets stacked in a feeder Method for unstacking sheets stacked in a feeder

B - Operations, Transporting

65

H

B65H 3/00 (2006.01) B65H 3/08 (2006.01) B65H 3/42 (2006.01)

Patent

CA 2342741

The invention concerns a method for unstacking sheets stacked in a feeder, comprising a step which consists in bringing a vacuum cup (4) close to the surface of the sheet at the top of the stack; a step which consists in contacting the vacuum cup with the surface of said top sheet; and a step in bringing the vacuum cup away after seizing the top sheet. The invention is characterised in that the vacuum cup is applied in an off-centre zone of the top sheet, and said vacuum cup is inclined, when it starts to move away, so as to cause the top sheet to be deformed thereby producing a separation prior to complete separation of the top sheet.

La présente invention concerne un procédé et dispositif pour le dépilage de feuilles empilées dans un chargeur, com-portant une étape de rapprochement d'une ventouse de la surface de la feuille supérieure de la pile, une étape de mise en contact de la ventouse avec la surface de ladite feuille supérieure et une étape d'éloignement de la ventouse après préhension de la feuille supé-rieure, caractérisé en ce que la ventouse est appliquée en une zone décentrée de la feuille supérieure, et en ce que ladite ventouse est inclinée, au début de l'étape d'éloignement, de façon à provoquer une déformation de la feuille supérieure produisant un décollage préalablement au décollage total de la feuille supérieure.

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