Draw-roller unit for a web-printing machine

Details Draw-roller unit for a web-printing machine Draw-roller unit for a web-printing machine

1990-08-01

1993-07-27

Stodola, Daniel P.

Advancing material of indeterminate length

With adherence or attraction of material to advancing means

By pneumatic pressure

226194, B41F 516

Patent

active

052304566

ABSTRACT:
The draw-roller unit has only one suction roller (20b, 21b) as a draw roller, in which a constantly acting suction effect is effective along that circumferential portion round which the paper web is looped, whilst the remaining circumferential portion experiences no suction effect. The suction roller has a fixed hollow roller core (65) and a roller casing (61) rotatable about this and consisting of plastic-impregnated carbon fibres, with suction ports (62) distributed over its circumference. The roller core (65) is equipped, on its one side, with an axial connection piece (68b) for fastening to the machine stand and for connection to a vacuum source, on its other side with a bearing journal (66) and, on its circumference having passage orifices (70) with two radial partition walls (69) which are arranged at a specific angular distance from one another and which enclose a suction chamber between them. The roller casing is mounted on the bearing journal (66) a conical connecting flange (61b) fastened directly to the rotor shaft of the drive motor and is mounted with its other end on the connection piece (68b), the gaps between roller casing and partition walls (69) being approximately airtight. Instead of a suction roller, a draw roller subjected to compressed air on the outside along the circumferential portion can also be provided, or else the suction-air and compressed-air effects are combined.

REFERENCES:
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patent: 3796361 (1974-03-01), Rueckert
patent: 3926353 (1975-12-01), Gay
patent: 4029249 (1977-06-01), Nagel et al.
patent: 4207998 (1980-06-01), Schmid
patent: 4328626 (1982-05-01), Leitner
patent: 4344552 (1982-08-01), Gref
patent: 4381212 (1983-04-01), Roberts
patent: 4925080 (1990-05-01), Crouse et al.
patent: 4998658 (1991-03-01), Distefano et al.
patent: 5062360 (1991-11-01), Germann et al.

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