Apparatus and method for detecting perforations

Details Apparatus and method for detecting perforations Apparatus and method for detecting perforations

B - Operations, Transporting

31

B

B31B 23/60 (2006.01) B65H 43/00 (2006.01)

Patent

CA 2114979

Abstract of the Disclosure An apparatus for use in a system for making bags or the like from a continuous web or sheet of film material, the system including a perforator for imparting series of transverse perforations onto the web at regularly spaced intervals, which comprises a spreader roll having a reduced diameter portion between two enlarged diameter portions; a switch device located adjacent the reduced diameter portion; wherein the large diameter portions cause each series of perforations to pull apart and form a gap as the web is drawn over the spreader roll; and wherein the switch device is capable of being activated each time a gap passes in close proximity to the switch device.

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