Printing – Antismut device – Anti-offset material application
Patent
1984-11-14
1986-02-25
Fisher, J. Reed
Printing
Antismut device
Anti-offset material application
101177, 101181, 101248, B41F 506, B41F 516
Patent
active
045720746
ABSTRACT:
A method and apparatus are disclosed for registering a perfecting offset printing unit to a reference perfecting offset printing unit while minimizing displacement between associated non-print gap areas. The circumferential position of the upper printing plate and the lower printing plate of the unit to be registered is monitored with respect to their associated blankets. The print registration between the unit to be registered and the reference unit is monitored. Printing position changes for the upper printing couple and the lower printing couple of the unit to be registered that are needed to effect registration with the reference unit are determined. A circumferential bias is determined responsive to the determined printing position changes needed and responsive to the monitored circumferential position of the upper printing plate and the lower printing plate. The upper and lower printing couples of the unit to be registered are rotated by a unit-to-unit phaser adjustment assembly and the upper printing plate and the lower printing plate are also rotated respectively by an upper and a lower circumferential adjustment assembly with respect to their associated blankets responsive to the circumferential bias and respectively responsive to the monitored printing plate positions and determined printing position changes needed for their associated printing couple. The rotation of the printing couples and the upper and lower printing plates are done simultaneously, effectuating registration between the unit and the reference unit while minimizing displacement between associated no-print gap areas.
REFERENCES:
patent: 2863387 (1958-12-01), Huffman
patent: 3641933 (1972-02-01), Tafel
patent: 3701464 (1972-10-01), Grum
patent: 3717092 (1973-02-01), Crum
patent: 3732815 (1973-05-01), Greiner
patent: 3742849 (1973-07-01), Greiner
patent: 3742850 (1973-07-01), Sedlak
patent: 3746957 (1973-07-01), Forster
patent: 3945266 (1976-03-01), Dufour et al.
Fisher J. Reed
Harris Graphics Corporation
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