Offset printing machine

Details Offset printing machine Offset printing machine

1990-06-25

1992-11-24

Crowder, Clifford D.

Printing

Rolling contact machines

Rotary

101350, B41F 702

Patent

active

051653419

ABSTRACT:
To permit use of a yielding surface covering (16) on an ink application cylinder (7, 12, 32) offset printing machine, without slippage or rubbing between the ink application cylinder and an adjacent plate cylinder (5, 31), a drive is arranged between the plate cylinder and the ink application cylinder which provides for corresponding linear circumferential speed by changing the profile of engaged drive gears (6, 13) driving the ink application cylinder and the plate cylinder; the drive gears have the same pitch circle diameter. The yielding surface (16) on the ink application cylinder has a thickness of between 2-3% of the diameter of the ink application cylinder (12) and a durometer value of between about 60-70 on the Shore A scale; the ink application cylinder (12) has a diameter of about 99% of the diameter of the plate cylinder and in operation is engaged against the plate cylinder over an engagement zone of about 7-9 mm in circumferential length (1).

REFERENCES:
patent: 2036835 (1936-04-01), Sites
patent: 3587463 (1971-06-01), Granger
patent: 4428291 (1984-01-01), Dorow
patent: 4527471 (1985-07-01), Dahlgren et al.
patent: 4590857 (1986-05-01), Dahlgren
patent: 4696229 (1987-09-01), Bezler et al.
patent: 4805530 (1989-02-01), Kobler et al.
patent: 5009158 (1991-04-01), John et al.

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