G - Physics – 01 – B
Patent
G - Physics
01
B
340/123.1, 358/5
G01B 7/34 (2006.01) B21C 51/00 (2006.01)
Patent
CA 1095140
ABSTRACT OF THE DISCLOSURE A continuous production line is divided into a plurality of zones, with each of which there is associated a presettable counter. An anticipated length of a material, which has been calculated from information as to the length of the material before welding, is converted into a given number of pulse signals, which in turn are preset in this counter, with its timing being shifted a zone to zone distance. Elongated materials which have been sequen- tially joined by welding into a continuous length of material are fed into the production line, and the length of material actually fed is detected by means of a feed length gage. Output from the gage is converted into a pulse signal. The length of the material actually fed is subtracted from the anticipated length of the material, i.e., the preset count value, as the material is being fed. Thus, it is presumed that a welded point of the length of material is present in the zone where a preset count value becomes zero as a result of the aforesaid subtraction. This presumption is further corrected by means of a welded point detecting means provided in a given position in the production line. The welded point detecting means is provided in the form of a X-ray thickness gage or temperature detector for non-contact- ing detection, without subjecting the material to physical or chemical working.
284052
Fetherstonhaugh & Co.
Sumitomo Kinzoku Kogyo Kabushiki Kaisha
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