Folding unit

Details Folding unit Folding unit

B - Operations, Transporting

21

D

B21D 5/16 (2006.01) B21D 39/02 (2006.01)

Patent

CA 2190512

The invention relates to a corner bending unit (2) for achieving a reciprocating movement in a tool holder (14) for a bending tool (12) said 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 limit (18) and the triangle link (30).

L'invention porte sur une plieuse (2) de cornières imprimant un mouvement alternatif à un porte-outils (14) muni d'un outil de pliage (12), ledit porte-outils étant articulé sur des fondations (4) par l'intermédiaire de bielles parallèles (16, 18). La plieuse (2) est munie d'un vérin pneumatique (38) dont la bielle (36) est reliée pivotante (34) à une liaison triangulaire (30) à son tour reliée pivotante (32) à l'extrémité d'une bielle (28) dont l'autre extrémité est reliée à un pivot (22) sur le porte-outil. La liaison triangulaire, fixée aux fondations (4) par l'intermédiaire d'un pivot (24), constitue avec la bielle (28) un mécanisme à rotule (28, 30) qui sous l'effet de la bielle du vérin (38) peut passer de la position repliée illustrée dans une position entièrement déployée, le porte-outils (14) étant de ce fait mobile entre une position de départ et une position de travail. Le pivot (22) est commun à la bielle (16) et à la bielle (28), et il (24) est commun à la bielle (18) et à la liaison triangulaire (30).

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