Roll apparatus with a hydraulically supported bottom roll having

Details Roll apparatus with a hydraulically supported bottom roll having Roll apparatus with a hydraulically supported bottom roll having

1989-12-14

1991-09-03

Foster, Jimmy G.

Presses

Concurrent pressing and conveying

Roll type

291162, B30B 304

Patent

active

050442732

ABSTRACT:
In a roll apparatus formed by a top roll and a hydraulically supported bottom roll, which together form a roll nip, additional piston/cylinder units that can lift the hollow cylinder near its working position closing the roll nip are provided at least at the ends of the hydraulically supported bottom roll. Due to the geometric arrangement employed, this lifting function is operative only up to a predetermined position of the hollow cylinder relative to its crosshead, which is selected to be at a short distance before closure of the roll nip. The pressure in the piston/cylinder unit degenerates whenever the piston of the additional piston/cylinder unit is forced out of sealing contact with its respective cylinder when the predetermined position is reached.

REFERENCES:
patent: 3921514 (1975-11-01), Biondetti
patent: 4188814 (1980-02-01), Heuss
patent: 4319389 (1982-03-01), Marchioro
patent: 4357743 (1982-11-01), Hefter et al.
patent: 4480452 (1984-11-01), Schnyder
patent: 4480459 (1984-11-01), Feldman et al.
patent: 4625637 (1986-12-01), Pav et al.
patent: 4709571 (1987-12-01), Guttinger
patent: 4757582 (1988-07-01), Verkasalo
patent: 4815183 (1989-03-01), Bondetti
patent: 4848119 (1989-07-01), Pav et al.

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