Web feed printing press

Details Web feed printing press Web feed printing press

1989-03-20

1990-04-24

Eickholt, Eugene H.

Printing

Rolling contact machines

Rotary

226 31, 226 92, 318 7, B41F 1354

Patent

active

049190490

ABSTRACT:
A web feed printing press, more especially a rotogravure press, has a longitudinal shaft for driving printing units and a device for driving the web draw rolls. In order to achieve a simpler design without any direct mechanical connected between the draw rolls and the longitudinal while still ensuring accurate drive operation the drive device for the pair of draw rolls comprises a main motor and an auxiliary motor each with an adjustable speed of rotation. A differential drive has two inputs and one output. The speed of rotation of the main motor is varied in a way dependent on the speed of rotation of the longitudinal shaft and the speed of rotation of the auxiliary motor is varied in accordance with the speed of rotation of the longitudinal shaft and of the tension of the web of paper to be printed. The auxiliary motor is coupled with a differential element of the differential drive, which is preferably in the form of a harmonic drive, so that a speed difference in the rotation between, on the one hand, the input of the differential drive connected with the main motor and, on the other hand, the output of the differential drive connected with the pair of draw rolls may be produced.

REFERENCES:
patent: 3186273 (1965-06-01), Tomberg
patent: 3276647 (1966-10-01), Lewis, Jr. et al.
patent: 3539085 (1970-11-01), Anderson
patent: 4004570 (1977-01-01), Roch
patent: 4007866 (1977-02-01), Traise
patent: 4078487 (1978-03-01), McComb
patent: 4214524 (1980-07-01), Corse
patent: 4658723 (1987-04-01), Tokuno et al.
patent: 4719855 (1988-01-01), Lannon et al.
patent: 4750659 (1988-06-01), Maier et al.
patent: 4805111 (1989-02-01), Steidel

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