Sheet feeding unit for rotary printing machine

Details Sheet feeding unit for rotary printing machine Sheet feeding unit for rotary printing machine

1991-09-20

1992-08-04

Fisher, J. Reed

Printing

Rolling contact machines

Rotary

101411, B41F 502, B41F 2106, B41F 2110, B41L 2108

Patent

active

051349388

ABSTRACT:
A sheet feeding unit for a rotary sheet printing machine which is operative for selective face printing or face and back printing with turning of a sheet rear edge and which has a turning cylinder and a printing cylinder located before the turning cylinder, includes elements located underneath the turning drum and the printing drum for conducting and guiding overlong sheets in face and back printing during a turning step on a front edge. The elements include a suction member arranged rotatably over a circular path so as to take over a sheet in a point of intersection of tangent t.sub.s, a stationary segment arch arranged equidistantly relative to the circular path under a point of intersection T.sub.4,5 of the printing cylinder and a sheet guiding cylinder and also provided with guiding rollers, and a guiding plate located above a turning point of the suction member at a distance from the printing cylinder and inside the circular path over a line of a secante.

REFERENCES:
patent: 3884146 (1975-05-01), Ruetschle
patent: 4099463 (1978-07-01), Zimmermann
patent: 4535691 (1985-08-01), Kida

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