| 摘要 |
PROBLEM TO BE SOLVED: To provide a pass/fail determination method for the length in transfer direction of workpieces, which are cut-worked articles transferred after being obtained by cutting a long material to a desired length with a cutting machine one after another, capable of performing pass/fail determination accurately, and moreover inexpensively and simply even if the transfer speed of their line changes. SOLUTION: From among pictures obtained by photographing a workpiece continuously with a camera set and fixed on the downstream side of the cutting machine after a pair of criterion marks are formed at a preset interval near both ends of the workpiece by a high-accuracy NC apparatus, a static picture in which the respective edges of the workpiece and the criterion marks are photographed together is searched. When the edges or the marks are missing in each picture, it is determined to be impossible. When both exist, both static pictures are extracted and analyzed, and the distance between the downstream-side edge of the workpiece and its criterion mark and the distance between the upstream-side edge and its criterion mark are calculated. Afterwards, based on the three lengths of the sum of both distance values, a preset interval between the pair of criterion marks, a desired workpiece-length, pass/fail determination of the workpiece is performed. COPYRIGHT: (C)2009,JPO&INPIT
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