Gusset folding mechanism and method for plastic bag making machi

Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container

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Details

493254, 493439, B31B 1726, B31B 2300

Patent

active

057498229

ABSTRACT:
In a bag making machine the longitudinal side edges and adjacent portions of an elongate plastic web, which is folded in half medially of its centerline, pass from a set of inlet rolls over and under, respectively, a pair of vertically spaced separating rolls before merging at a set of outlet rolls. The separating arms extend inwardly between the two separated portions of the web only part way toward the fold line, and are spaced apart exactly twice the depth of the gusset that is to be formed. The remaining portions of the web, which are bisected by the folded line, are disposed in a vertical plane transverse to the separating arms, and upon traveling from the arms to the outlet rolls are folded inwardly between the merging portions of the web by the inner, pointed end of a triangularly shaped plow, which engages and progressively urges the fold line inwardly to the desired gusset depth The separating arms are vertically adjustable relative to each other; and the plow is adjustable transversely of the fold line of the web selectively to adjust the depth of the gusset.

REFERENCES:
patent: Re26062 (1966-07-01), Ahlbrandt
patent: 4047711 (1977-09-01), Gregoire et al.
patent: 4578051 (1986-03-01), Everman
patent: 5147278 (1992-09-01), Demura et al.

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