Conversion of letterpress to offset printing

Details Conversion of letterpress to offset printing Conversion of letterpress to offset printing

1988-10-28

1991-01-22

Fisher, J. Reed

Printing

Planographic

Rotary machines

101177, 101179, 101220, B41F 702, B41F 1328

Patent

active

RE0335223

ABSTRACT:
A method and apparatus for conversion of a web fed letterpress unit (10) into a web fed offset printing press unit (42) having a main frame (12) an auxiliary frame (44) inside the main frame for receiving cylinders, a pair of offset plate cylinders (46 and 46a) for mounting printing plates thereon, an inking arrangement (16, 18 and 20) for applying films of ink to the plates, and a pair of blanket cylinders 48 and 48a) in close proximity of a position for respective rolling contact with the plates on the plate cylinder and the other blanket cylinder. An offset press gear train (114) is installed outside the frames if the shafts for the cylinders can be extended through the bores (56, 56a, 58, 58a, 76 and 112) in the main frame left from the removed letterpress unit cylinders. Otherwise the gear train (54) is placed inside the main frame. Pilots (60, 60a, 62 and 62a) for insertion into bores in the main frame guide the installation of the auxiliary frame. Eccentric bearings (68) are installed for bodily swinging cylinders between alternative positions.

REFERENCES:
patent: 2118965 (1938-05-01), Buttner
patent: 2216562 (1940-10-01), Barber
patent: 3072050 (1963-01-01), Wolff
patent: 3470816 (1969-10-01), Piecha et al.
patent: 3616751 (1971-11-01), Mowry
patent: 3986454 (1976-10-01), Grancer

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