Apparatus for spiral wrapping a load by a web of stretched plast

Details Apparatus for spiral wrapping a load by a web of stretched plast Apparatus for spiral wrapping a load by a web of stretched plast

1987-04-29

1988-01-12

Sipos, John

Package making

Apparatus for contraction of cover by stretching or shrinking

53587, 53211, B65B 1104

Patent

active

047182199

ABSTRACT:
The apparatus for spiral wrapping a load comprises a carriage which is mounted moveably in the vertical direction on a fixed base-mounted stand and to which two prestretch rollers each coupled with simultaneous rotation with a frictionally engageable wheel and a film supply roll are secured. The downstream prestretch roller and its associated frictionally engageable wheel are carried by a two-arm assembly moveable around a vertical axis and may be moved by moving the member in order to engage or to disengage the frictionally engageable gearing mechanism. A switching assembly which keeps the gearing mechanism disengaged at the beginning of the wrap and thereafter allows an engagement of the friction gearing mechanism until the end of the wrap comprises a base-supported, vertically displaceable and upwardly pretensioned cam member with an upper abutment surface and a lateral cam surface and a switching element coupled rotatably with one arm member of the two-arm member. The switching assembly is spaced, at a fixed distance, relative to the moveable prestretch roller, pushes the cam member downward upon contact with the abutment surface and, being in contact with the cam surface, keeps the moveable prestretch roller disengaged at the beginning of the wrap.

REFERENCES:
patent: 4302920 (1981-12-01), Lancaster
patent: 4317322 (1982-03-01), Lancaster
patent: 4497159 (1985-02-01), Lancaster

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