Advancing material of indeterminate length – With material-responsive control means – To regulate longitudinal movement of material
Patent
1979-07-09
1981-03-03
Christian, Leonard D.
Advancing material of indeterminate length
With material-responsive control means
To regulate longitudinal movement of material
242185, B65H 2318
Patent
active
042535972
ABSTRACT:
Apparatus for controlling the infeed speed of a web of material relative to the outfeed speed so that damage to the web will be minimized. The control apparatus senses the length of a loose loop formed by the web and includes a moving belt provided with perforations along its length and which is, in part, positioned between a vacuum chamber and the downwardly depending portion of the web loop. The downwardly descending portion of the web loop is held in contact with the adjacent surface of the perforated belt by a low level vacuum in the vacuum chamber and the position of the loop, with respect to the number of the holes in the belt covered by the downwardly descending portion of the loop, regulates the degree of vacuum in the vacuum chamber. As the loop lengthens, the vacuum increases in a vacuum chamber behind the belt, conversely, when the loop shortens, the vacuum in the chamber decreases. A signal corresponding to the vacuum in the vacuum chamber is communicated to a pressure transducer-amplifier. An output signal from the transducer-amplifier is used to control the operation of a ratio changing device which includes a variable pitch sheave and which changes the infeed speed of the web in accordance with the output signal. The use of the control apparatus permits the direction of the web to be changed through an angle of 180.degree. and also permits the web to be inverted, without undue risk of damage to the web.
REFERENCES:
patent: 2897754 (1959-08-01), Spiller
patent: 3138168 (1964-06-01), Waller
patent: 3485427 (1969-12-01), Busker
patent: 3561654 (1971-02-01), Greiner
patent: 4025026 (1977-05-01), Merritt et al.
Christian Leonard D.
Moore Business Forms Inc.
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