Advancing material of indeterminate length – By intermittent material-mover – With retrograde movement preventer
Patent
1993-11-30
1996-05-07
Stodola, Daniel P.
Advancing material of indeterminate length
By intermittent material-mover
With retrograde movement preventer
13762566, B65H 2000
Patent
active
055137903
ABSTRACT:
A feeding device for web material has a pneumatic actuator assembly incorporating a three-way pneumatically piloted control valve which controls communication between the pneumatic actuator assembly and a source of air under pressure and a discharge port, respectively. The control valve includes a spool having a plunger disposed in a first chamber connected to a pilot passage, a cylindrical obturator located in a second passage having an air inlet passage located in an end of the chamber surrounded by a flat face seal seat and a radial air outlet passage leading to the feeding device. An intermediate chamber is disposed in communication with the second chamber and is connected to a discharge passage. A flat annular face seal seat is formed between the second chamber and the intermediate chamber whereby the two flat face seal seats are engageable by flat opposite faces of the cylindrical obturator.
REFERENCES:
patent: 3937379 (1976-02-01), Narwid et al.
patent: 4051802 (1977-10-01), Haytayan
patent: 4823840 (1989-04-01), Kosugi et al.
patent: 5062349 (1991-11-01), Khan
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