Jam detection and removal for wrapping machine

Details Jam detection and removal for wrapping machine Jam detection and removal for wrapping machine

1982-04-26

1985-04-30

Coan, James F.

Package making

Interrelated or safety controls

53 66, 53389, 53556, 493 33, B65B 1154, B65B 1112

Patent

active

045135584

ABSTRACT:
In a stretch film wrapping machine wherein packages are elevated into a stretched sheet of film and underfolded, an improved control system monitors the operation of the wrapping machine to detect a jam condition and stop the machine for such jam conditions. A microprocessor monitors clock counts generated by the main drive shaft of the wrapping machine to detect a jam condition. Microprocessor operating cycles are counted between consecutive clock counts generated. If the drive shaft hesitates for a defined period of time, the counter overflows indicating a jam condition. The system also provides for operating the film wrapping machine in a reverse direction in discrete steps within a defined and limited range of the machine operating cycle to thereby facilitate removal of jams. To further facilitate jam removal, the rear film underfolder and package pusher are mounted to be moved away from the machine to thereby remove pressure from packages jammed beneath the rear underfolder.

REFERENCES:
patent: 2470762 (1949-05-01), Dickenson
patent: 3398659 (1968-08-01), Egleston
patent: 3662513 (1972-05-01), Fabbri
patent: 3967433 (1976-07-01), Bonfiglioli
patent: 4134246 (1979-01-01), Michels
patent: 4180962 (1980-01-01), Michels
patent: 4205501 (1980-06-01), Michels
Brochure entitled "Weldotron Automac Stretch Packaging System".

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