Package wrapping method and machine

Details Package wrapping method and machine Package wrapping method and machine

1989-01-09

1990-09-25

Sipos, John

Package making

Methods

Conforming by stretching or shrinking of cover over contents

53464, 53 66, 53223, 53556, B65B 1118, B65B 5704

Patent

active

049584790

ABSTRACT:
An elevator package wrapping machine comprises a film gripper for initially drawing fixed lengths of film into the machine. While the film is held by the film gripper and side clamps, a package is elevated into the film such that the height of the package draws a first addition to the film drawn by the gripper, if required. Film side and rear underfolders fold the lateral edges of the film and the rear edge of the film extending from the film source under the packages, respectively. A film cutter is provided for severing the film from its source as the packages are being wrapped, and the cutter is controlled such that the timing of its operation is based on package length. By timing the operation of the film cutter to correspond to package length, a second film addition may be drawn by the rear underfolder during package wrapping, if required. Since the film may be cut on the fly as it is being drawn by the rear underfolder, the cutter preferably comprises a heated member and a brake which is applied to the film prior to severance such that the film is substantially stopped and stretched to thereby be cleanly severed and retract from the heated member to prevent fouling.

REFERENCES:
patent: 2611224 (1952-09-01), Jensen
patent: 2761176 (1956-09-01), Knapp
patent: 3251171 (1966-05-01), Lagesse
patent: 3967433 (1976-07-01), Bonfiglioli
patent: 4217744 (1980-08-01), Mizutani
patent: 4510731 (1985-04-01), Mathieu
patent: 4522013 (1985-06-01), Hamilton
patent: 4583348 (1986-04-01), Treiber

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