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Unstacking apparatus for removing a partial stack from a stack of sheets

  • US 5,102,293 A
  • Filed: 07/31/1990
  • Issued: 04/07/1992
  • Est. Priority Date: 10/12/1989
  • Status: Expired due to Term
First Claim
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1. Unstacking apparatus for the removal of a partial stack from a sheet stack (3) disposed on a supporting surface (2), with a tabletop (1) mounted on a table guideway (5) horizontally movable relative to the aforementioned supporting surface (2), a gripper comprising an upper gripper jaw (6) and a gripper base (7) for seizing and holding an edge of a partial stack (3.1), and a vertical adjustment device for executing vertical relative motions between the tabletop (1) and the gripper (6, 7), on the one hand, and the supporting surface (2), on the other hand, the gripper base (7) containing a blade guide (11), a horizontal blade (12), and a blade derive mechanism (13) for effecting horizontal motions of the blade (12) with respect to the blade guide (11), at least one supporting element (24, 25) mounted beside the blade, and a supporting element adjustment device (26, 27, 28) for executing horizontal movements of the supporting element (24, 25) with respect to the blade guide (11);

  • the gripper (6,

         7) furthermore comprising a supporting element rise and fall mechanism (29,

         30) for executing vertical movements of the supporting element (24,

         25) with respect to the blade (12), and a gripper carrier (8) which guides an element (14) carrying the upper gripper jaw (6) and the blade guide (11) in a freely vertically displaceable fashion.

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