Detecting device for breaks or tears and for the end of the...

G - Physics – 01 – B

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G01B 5/06 (2006.01) B65H 26/02 (2006.01)

Patent

CA 1121872

ABSTRACT The present invention relates to a device for detecting breaks or tears which occur in a strip of any sheet-like material while the sheet slides and advances on rollers in a fixed or variable direction. The detect- ing devices normally use photocells which are predisposed for detection of the lack of paper or the like, and the subsequent control for the junction or splicing. One shortcoming which arises is that in many cases the strip may tear laterally, and since the tear does not take place completely along the entire width of the strip, it is not detected by the photocell. In such cases the known detecting devices very frequently will not give, when it is most necessary, the control for the junction which is desired, thereby necessitating the manual intervention of an operator and reducing the operating efficiency of a production line. The present invention provides a detecting device for tears and breaks for detecting the end of the strip. This eliminates the above-mentioned inconveniences and puts the joining machine in condition to operate at full speed without the intervention of an operator. This is accomplished by providing a fixed support, on which a device for detecting the tear and the end of the reel, along with a sensor provided with a blade can slide and be positioned in the direction of the width of the sheet which is sliding and advancing.

321811

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