Apparatus and method for detecting perforations

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

1993-02-11

1994-09-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

225100, G01N 2186

Patent

active

053509285

ABSTRACT:
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 perforation 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.

REFERENCES:
patent: 4172553 (1979-10-01), Feather et al.
patent: 4284221 (1981-08-01), Nagel et al.
patent: 4454973 (1984-06-01), Irvine
patent: 4618085 (1986-10-01), Kimura et al.

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