Printing cylinder construction for sheet-fed offset rotary print

Details Printing cylinder construction for sheet-fed offset rotary print Printing cylinder construction for sheet-fed offset rotary print

1985-02-04

1986-07-08

Pearson, Charles A.

Printing

Rolling contact machines

Rotary

101409, 271 82, B41F 2104

Patent

active

045986410

ABSTRACT:
To reliably hold a sheet in a rotary sheet-fed offset printing machine, a plurality of pin or needle-like projections (11), preferably held on a holding strip (12), are located transversely just behind or beneath the grippers. The sheet is pressed against the pins by the rubber blanket of the blanket cylinder, to impale the sheet on the pins; or, if the projections are located beneath the grippers, the grippers indirectly apply pressure on the sheet to impale the sheet on the projections. In another embodiment (FIG. 6), a pressure block (13) with a resilient engagement surface (14) presses the grippers on the sheet for also impaling the sheet on the pins or needles. The projections may also be formed as knife edges (FIG. 4). Alternatively, the printing line can be shifted forwardly (FIG. 5), so that the rubber blanket will engage the ends of the grippers.

REFERENCES:
patent: 1208731 (1916-12-01), Blaine
patent: 1303793 (1919-05-01), Henderson et al.
patent: 1916454 (1933-07-01), Wohlrabe
patent: 3796154 (1974-03-01), Weisgerber
patent: 4427193 (1984-01-01), Kahlert et al.

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