| 摘要 |
PCT No. PCT/SE95/00579 Sec. 371 Date Nov. 15, 1996 Sec. 102(e) Date Nov. 15, 1996 PCT Filed May 23, 1995 PCT Pub. No. WO95/32820 PCT Pub. Date Dec. 7, 1995A corner bending unit (2) for achieving a reciprocating movement in a tool holder (14) for a bending tool (12), the tool holder being articulated to a foundation (4) via parallel links (16, 18). The corner bending unit (2) has a pneumatic cylinder (38) with a piston rod (36) which is pivotally (34) joined to a triangle link (30), which is in turn pivotally joined (32) to one end of a link (28), the other end of which being joined to a pivot point (22) on the tool holder. The triangle link is pivotally carried in the foundation (4) about a pivot point (24) and forms, together with the link (28), a knee-joint mechanism (28, 30), which, under the influence of the cylinder (38) piston rod (36), can be moved from the bent-out position shown to a completely extended position, the tool holder (14) being movable between a starting position and a work position. The pivot point (22) is common to parallel link (16) and the link (28), and pivot point (24) is common to parallel link (18) and the triangle link (30). |
