Tray package wrapper folding arms

Package making – Apparatus for contraction of cover by stretching or shrinking

Patent

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Details

53226, 53228, B65B 1118

Patent

active

047304413

ABSTRACT:
There is disclosed an improved form of folding arms in a tray packaging wrapping machine that elevates a tray of meat or other product causing it to be wrapped on top and sides by a sheet of stretchable PVC film after which arms fold the edges of the film underneath the tray; wherein the improved folding arms move with nonrotational motion from opposing edges of the tray toward the center of the tray. Said arms have a film-engaging edge portion with a length substantially less than the width of the film sheet being folded, this edge portion being defined by an indentation in the outline of the arm at each end of the edge portion; the depth of the indentations are about 10% to about 50% of the length of the film-engaging edge portion and the transition between the film-engaging edge portion and the indentations is curved with a radius of curvature of about one-half inch. Preferably the linear motion of the opposing folding arms in opposite directions is effected by a rack and pinion mechanism with a rack associated with each arm engaging an opposing side of a fixed, freely-rotatable pinion. The conventional cam operating mechanism for the machine operates through a linkage to move one or the other of the racks and its associated arm.

REFERENCES:
patent: 3662513 (1972-05-01), Fabbri
patent: 3967433 (1976-07-01), Bonfiglioli
patent: 3977158 (1976-08-01), Jennings
patent: 4035990 (1977-07-01), Hallam
patent: 4078363 (1978-03-01), Ranzi
patent: 4178740 (1979-12-01), Groom
patent: 4574564 (1986-03-01), Pester

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