Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1999-02-17
2000-03-07
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
723894, B21D 502, B30B 1502, B21J 1303
Patent
active
060325097
ABSTRACT:
A press brake comprising a bed for supporting a lower mold on the upper surface thereof, a ram for supporting an upper mold in opposition to said lower mold a driver for causing either the ram or the bed to move for bending a workpiece between the upper and lower molds, and a distance adjusting device for adjusting the distance between the upper and lower molds via operation of a wedging unit and a pair of reciprocating units. The wedging unit is disposed either between the ram and the upper mold or between the bed and lower mold, and comprises a pair of movable wedges vertically disposed and a stationary wedge disposed between the movable wedges in contact with the movable wedges. Each of the contacting surfaces of the wedges is formed by a plurality of inclined planes having different angles of inclination. The reciprocating units are connected to the movable wedges to move the movable wedges along the length of the molds. By shifting the movable wedges a predetermined distance in correspondence with actual length of the workpiece, the wedging unit is displaced corresponding to a deflection curve of the bed and the ram, and the workpiece bent at a proper bending angle throughout the whole length thereof.
REFERENCES:
patent: 3965721 (1976-06-01), Roch
patent: 4354374 (1982-10-01), Deguchi
patent: 5009098 (1991-04-01), Van Mersteijn
patent: 5103665 (1992-04-01), Van Merksteijn
Jones David
Toyokoki Co., Ltd.
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