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Plate bending machine equipped with a plate clamping manipulator and a plate position detecting device

  • US 5,058,406 A
  • Filed: 03/06/1990
  • Issued: 10/22/1991
  • Est. Priority Date: 01/29/1988
  • Status: Expired due to Term
First Claim
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1. A press brake comprising:

  • a pair of dies which can act in mutual cooperation to bend a workpiece having edges;

    a manipulator for grasping and moving the workpiece which is to be placed in an object position with respect to the dies; and

    detector means, mounted in a frame of the press brake in a specified positional relationship with respect to the dies, for detecting a plurality of points along the edges of the workpiece provided by the manipulator, thereby detecting a current position; and

    means for controlling the manipulator in response to a signal from the workpiece position detector means by adjusting the workpiece edges relative to the detector means so that the workpiece is positioned in the object position with respect to the dies;

    said means for controlling including means for calculating a spacing between the current position of the workpiece and the object position of the workpiece for at least two of said plurality of points along the edges of the workpiece and means for moving the workpiece so that each of said plurality of points moves toward each object position by a predetermined distance, the predetermined distance being determined by multiplying each of the calculated spacings by a factor which is smaller than one.

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