Apparatus for forming gussets in a tubular plastic film

Details Apparatus for forming gussets in a tubular plastic film Apparatus for forming gussets in a tubular plastic film

1985-11-27

1987-03-17

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264 402, 264 405, 264563, 425140, 425150, 425163, 4253261, 4253871, B29C 5310

Patent

active

046504060

ABSTRACT:
Folding elements for forming gussets in a tubular film are provided in the mutually opposite open areas between a pair of flattening plates and the plates are reciprocable in the axial direction of the tubular film for an adjustment of the depth of the gussets. The folding elements are mounted to be pivotally movable in all directions and are guided to be transversely displaceable relative to the axis of the tubular film. Adjacent to their mutually opposite, upstream ends the folding elements are provided with adjusting means for imparting a pivotal movement which is transverse to the direction in which the depth of the gussets is adjusted and/or about their longitudinal axes in dependence on a measured deviation of the outer fold lines from their desired position. Sensors are provided for detecting the location of the outer fold lines of the gussets formed in the tubular film.

REFERENCES:
patent: 2544044 (1951-03-01), Reber et al.
patent: 2607078 (1952-08-01), Grimes
patent: 2961930 (1960-11-01), Wamsley et al.
patent: 3335208 (1967-08-01), Harris
patent: 3368007 (1968-02-01), Palmer
patent: 3566756 (1971-03-01), Schmid et al.
patent: 3930781 (1976-01-01), Upmeier
patent: 4246212 (1981-01-01), Upmeier et al.
patent: 4355966 (1982-10-01), Sweeney et al.
patent: 4462779 (1984-07-01), Brinkmeier et al.

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