Printing unit with printing cylinders directly-driven by inducti

Details Printing unit with printing cylinders directly-driven by inducti Printing unit with printing cylinders directly-driven by inducti

1996-06-17

1998-01-06

Bennett, Christopher A.

Printing

Rolling contact machines

Rotary

101212, 101184, 101247, B41F 1300

Patent

active

057042888

ABSTRACT:
A printing machine including multiple interactively arranged printing cylinders, at least some of which are directly-driven by induction motors. The induction motors have rotors that are connected to the cylinder mantle of the printing cylinder, and stators directly or indirectly connected to the side walls of a printing unit along substantially rigid axes, so that the respective rotors and stators associated with each printing unit are radially displaced from each other relative to the axes to define a gap between adjacent printing cylinders. The relative radial position of the printing cylinders is determined not by any mechanical mounting but, rather, by way of magnetic lateral forces of the induction motors. Each directly-driven printing cylinder is also provided with asymmetrical prestress means which holds the printing cylinder in the off (non-printing) position, eccentric relative to the on (printing) position, regardless of the electrical control and in such a way that a gap remains between the interacting printing cylinders.

REFERENCES:
patent: 3732815 (1973-05-01), Greiner et al.
patent: 4324180 (1982-04-01), Jiruse et al.
patent: 4509425 (1985-04-01), Hahn et al.
"Frei schwebend und doch fest gehalten", Technische Rundschau (Technical Review) pp. 38-42, vol. 13 (1994).

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