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1. WO2002003026 - SYSTEM AND METHOD FOR ANGLE MEASUREMENT

Publication Number WO/2002/003026
Publication Date 10.01.2002
International Application No. PCT/CH2001/000419
International Filing Date 03.07.2001
IPC
B21D 5/02 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
5Bending sheet metal along straight lines, e.g. to form simple curves
02on press brakes without making use of clamping means
G01B 11/26 2006.1
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11Measuring arrangements characterised by the use of optical means
26for measuring angles or tapers; for testing the alignment of axes
CPC
B21D 5/02
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
5Bending sheet metal along straight lines, e.g. to form simple curves
02on press brakes without making use of clamping means
G01B 11/26
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11Measuring arrangements characterised by the use of optical means
26for measuring angles or tapers; for testing the alignment of axes
Applicants
  • FASTCOM TECHNOLOGY S.A. [CH]/[CH]
Inventors
  • STARTCHIK, Sergei
  • AGAH, Mehrdad
Priority Data
PCT/CH00/0036804.07.2000CH
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEM AND METHOD FOR ANGLE MEASUREMENT
(FR) SYSTEME ET PROCEDE DE MESURE D'ANGLE
Abstract
(EN) This application discloses an Angle Measurement System (AMS) for continuously measuring the angle of a metal sheet that is being bent by a bending machine to a required angle. AMS is composed of two modules (or heads) each containing a light source (laser, LED, etc.), an image sensor, a processing unit and a communication unit. One, two or more modules of the system are mounted above or below the sheet and a geometric pattern is projected by each light source on the sheet. This system automatically performs computations and adjustments and sends the resulting angle to the bending machine for control. The angle measurement method benefits from the following design features of the modules to optimize the speed of the computation: Random pixel access of image sensor is used to rapidly locate the projected pattern and then work only with pattern neighborhood. Immediate processing of the visual information allows to avoid transmission and storage elsewhere.
(FR) L'invention concerne un système de mesure d'angle permettant de mesurer, de manière continue, l'angle d'une feuille de métal en cours de pliage dans une cintreuse, selon un angle recherché. Ce système est composé de deux modules (ou têtes) chacun contenant une source de rayonnement lumineux (laser, DEL, etc.) un capteur d'image, une unité de traitement et une unité de communication. Un, deux ou plusieurs modules du système sont montés au dessus ou en dessous de la feuille et une forme géométrique est projetée par chaque source de rayonnement lumineux sur la feuille. Ce système réalise automatiquement des calculs et des ajustements et envoie à la cintreuse, pour commande, la valeur de l'angle résultant. Afin d'optimiser la vitesse de calcul, le procédé de mesure d'angle bénéficie des caractéristiques de conception des modules suivantes: un accès pixel aléatoire permet de localiser rapidement la forme projetée et travaille ensuite uniquement sur le voisinage de la forme. Le traitement immédiat de l'information visuelle évite l'émission et le stockage dans un autre endroit.
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