Method and apparatus for maintaining proper perforation phasing

Details Method and apparatus for maintaining proper perforation phasing Method and apparatus for maintaining proper perforation phasing

1994-03-15

1995-05-23

Lavinder, Jack W.

Manufacturing container or tube from paper; or other manufacturi

Control means energized in response to activator stimulated...

Responsive to work material, the product or means engaging...

493 14, 493 18, 493 22, 493 34, 493197, B31B 2314, B31B 2360

Patent

active

054176387

ABSTRACT:
In an apparatus for making plastic bags or the like from a continuous film of material comprising a sealing drum having at least one seal bar for imparting transverse seals to the film at regularly spaced intervals and a perforator having a rotatable perforator blade for imparting transverse perforations to the film at regularly spaced intervals, an apparatus and method are disclosed for tracking the positions of each seal and each perforation and comparing the difference between these positions to a desired difference and thereafter adjusting the rate of rotation of the perforator blade until the difference between the positions of each seal and each perforation is equal to the desired difference to thereby maintain a desired spacing between each seal and each perforation.

REFERENCES:
patent: 3004881 (1961-10-01), Van Der Meulen
patent: 3509799 (1970-05-01), Weis
patent: 3797368 (1974-03-01), Martelli
patent: 4380446 (1983-04-01), Dickson
patent: 4642084 (1987-02-01), Gietman, Jr.
patent: 4934993 (1990-06-01), Gietman, Jr.

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