Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1978-06-27
1980-11-25
Gilreath, Stanley N.
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
B65H 2508, B65H 2526
Patent
active
042353580
ABSTRACT:
An arrangement for the web edge control comprises a web edge feeler having a sending and receiving nozzles arranged respectively below and above the side edges of the web which is moved includes a motor pump unit for generating the supply air and the fluid pressure for a control diaphragm drive. The control diaphragm drive comprises a diaphragm which is shiftable by pressure changes to operate an adjusting device for shifting the web for example by tilting its rotatable roller support or by shifting the support to one side or the other. The diaphragm is provided with a differential pressure so that one side is admitted in a zero position with the same pressure as the other side during a time at which the sending and receiving nozzles are partially covered by the web edges up to a desired degree for the zero position setting. The air pressure in the receiving nozzle and the diaphragm space which is connected to the receiving nozzle of the web edge feeler is equal to the air pressure on the diaphragm space which is made adjustable by an adjusting throttle.
REFERENCES:
patent: 2814487 (1957-11-01), Medkeff
patent: 3071157 (1963-01-01), Robertson et al.
patent: 3244340 (1966-04-01), Fife et al.
patent: 3442428 (1969-05-01), Nilsson
patent: 3490674 (1970-01-01), Ott, Jr. et al.
patent: 3592372 (1971-07-01), James et al.
patent: 3779438 (1973-12-01), Nilsson
patent: 3881414 (1975-05-01), D'Amato et al.
Elektro-Mechanik GmbH
Gilreath Stanley N.
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