Method and a unit for feeding a strip of sheet material

Details Method and a unit for feeding a strip of sheet material Method and a unit for feeding a strip of sheet material

1999-04-06

2000-12-26

Matecki, Katherine A.

Winding, tensioning, or guiding

Tension control or brake

Supply controlled

2423313, 2423314, 2424181, B65B 1900

Patent

active

061645834

ABSTRACT:
A strip of sheet wrapping material fed to a user device is decoiled from a roll at an upstream station and then drawn by a vacuum into an equalizing chamber, internally of which it forms a running loop. The length of the loop is measured continuously by an analog sensing device operating in conjunction with at least one bistable pressure sensor, located at a given height inside the chamber, so as to establish a range of variation outside of which the measurement is ignored; thus, the length of the loop can be monitored accurately by the analog sensor within the selected range of variation, and maintained within this same range by the action of the pressure sensor.

REFERENCES:
patent: 2907565 (1959-10-01), Sauter
patent: 3796393 (1974-03-01), Beistle
patent: 4011976 (1977-03-01), Greer
patent: 4065074 (1977-12-01), Anderson et al.
patent: 4384665 (1983-05-01), Waddington
patent: 4437619 (1984-03-01), Cary et al.
patent: 4509007 (1985-04-01), Barsotti et al.
patent: 4762292 (1988-08-01), D'Anci
patent: 5308005 (1994-05-01), Hutteman et al.
patent: 5992789 (1999-11-01), Lamothe

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