Maintaining perforation phasing

Details Maintaining perforation phasing Maintaining perforation phasing

1993-11-12

1995-09-05

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 15, 493197, B31B 164, B31B 1900

Patent

active

054474868

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, the film comprising print marks appearing thereon at regularly spaced intervals, an apparatus and method are disclosed for tracking the positions of each print mark and each perforation and comparing the difference between these positions to a desired difference and thereafter adjusting the angular position of the perforator blade until the difference between the positions of each print mark and each perforation is equal to the desired difference to thereby maintain a desired spacing between each print mark and each perforation.

REFERENCES:
patent: 4695346 (1987-09-01), Lehmacher
patent: 4847775 (1989-07-01), Bobst
patent: 4934993 (1990-06-01), Gietman, Jr.
patent: 5094656 (1992-03-01), Hatchel et al.

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