Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1998-11-17
1999-08-17
Mansen, Michael R.
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
226 22, 2425631, 13762518, 137595, 251 612, B65H 4300, F17D 31128
Patent
active
059380985
ABSTRACT:
A positive pressure operated servo 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 sensor and servo valve which regulates a double-acting air actuator having an output member to move a web positioning assembly. The servo valve is regulated by a diaphragm that is controlled by a pneumatic correction signal force from a low pressure sensor circuit and is arranged under the influence of such signal force to selectively position 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 and maintain the position of the web.
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Mansen Michael R.
Mantooth Geoffrey A.
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