Winding – tensioning – or guiding – Unwinding – With detector – indicator – or control
Patent
1996-05-17
1997-09-09
Mansen, Michael
Winding, tensioning, or guiding
Unwinding
With detector, indicator, or control
226 19, 226 23, 226 45, B65H 2600, B23Q 1500
Patent
active
056647387
ABSTRACT:
A positive pressure operated control apparatus for lateral alignment of a continuous web of paper, plastic, textiles and other materials which are being processed at windup, unwind, printing, coating, folding and slitting stations, or other intermediate points in the machine process. The apparatus includes an air source communicating with a combination sensor and controller which regulates a double-acting air actuator having an output member to move a web positioning assembly. The controller is regulated by a sensor paddle which is spring loaded to be maintained in engagement with the web edge. As the web wanders or becomes misaligned, the paddle moves in proportion to the misalignment and results in movement of a valve element relative to two orifice openings to provide differential air pressure proportional to error to operate the actuator to produce actuator movement proportional to the error to correct the position of the web.
REFERENCES:
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patent: 2814487 (1957-11-01), Medkeff
patent: 3727817 (1973-04-01), Tibavido
patent: 3750920 (1973-08-01), Fountain et al.
patent: 3908881 (1975-09-01), McCann
patent: 4073448 (1978-02-01), Kolosov
patent: 4629061 (1986-12-01), Crandall
patent: 4655378 (1987-04-01), DuFour
patent: 4666073 (1987-05-01), DuFour
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