Device and method for determining a bending angle of a sheet...

G - Physics – 01 – B

Patent

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G01B 11/26 (2006.01) B21D 5/02 (2006.01)

Patent

CA 2388412

The present invention relates to a method for determining the bending angle of a sheet which has been bent along a bending line, comprising the steps of generating at least one light beam, using these beams to project two points or line segments onto a part of the sheet to be checked which lies on one side of the bending line. The beams form an angle of incidence which is known in advance with the bending line of the sheet. These points or line segments are imaged onto receiving means and the distance between the points or line segments is determined, which have been projected onto the receiving means. The beams lie in two parallel detection planes, the distance between which is known. The bending angle is determined from the distance between the projected points, the known angles of incidence of the beams and the known distance between the detection planes.

La présente invention concerne un procédé de détermination de l'angle de pliage d'une feuille qui a été pliée le long d'une ligne de pliage, ledit procédé comprenant les étapes de création d'au moins un faisceau de lumière, d'utilisation de ces faisceaux pour projeter deux points ou segments de ligne sur une partie de la feuille à contrôler qui repose sur un côté de la ligne de pliage. Les faisceaux forment un angle d'incidence, qui est connu d'avance, avec la ligne de pliage de la feuille. Ces points ou segments de ligne sont représentés en images sur un dispositif de réception et la distance entre lesdits points ou segments de ligne est déterminée, ces points ou segments ayant été projetés sur le dispositif de réception. Les faisceaux se présentent dans deux plans de détection parallèles, la distance entre ceux-ci étant connue. L'angle de pliage est déterminé à partir de la distance entre les points projetés, les angles connus d'incidence des faisceaux et la distance connue entre les plans de détection.

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