Control apparatus for adjusting the position of a workpiece

Details Control apparatus for adjusting the position of a workpiece Control apparatus for adjusting the position of a workpiece

1980-04-10

1982-03-30

Gruber, Felix D.

Boots, shoes, and leggings

26 98, 26DIG1, G05D 300, D06C 306

Patent

active

043228020

ABSTRACT:
A web is conducted through various equipments for printing, cutting, creasing etc. It is important to make certain positional adjustments of the web as it travels through such equipment. For example, a web supplied from a roll has a natural but deleterious tendency to curl. A web decurler cancels this tendency by inducing a reverse curl. A web decurler or other such web handling equipment is adjusted through a control signal from a control signal generator. The control signal generator includes a metering device for producing a web signal signifying the longitudinal displacement of the web. Also included is a sensor for producing an adjust signal, signifying the extent of adjustment of the web. A manually operable device can vary the control signal and thus adjust the decurler or other such web handling equipment. A memory is used to store at least one contemporaneous pair of values of the web and adjust signals during an initial interindex interval. Also included is an automatic device for periodically varying the control signal from index to index to cause the value of the adjust and web signals to periodically correspond to the contemporaneous pair of values. Thus an initial manual adjustment subsequently controls the automatic operation of the control signal generator.

REFERENCES:
patent: 3002222 (1961-10-01), Sevison
patent: 3740805 (1973-06-01), Catallo
patent: 3858415 (1975-01-01), Wilson et al.
patent: 4097973 (1978-07-01), Cho
Innes: New Novakust Tenter Features Electronic Controls, Knitting Times, vol. 48, No. 32 Jul. 30, 1979.

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