Printing – Rolling contact machines – Rotary
Patent
1987-12-16
1990-01-16
Crowder, Clifford D.
Printing
Rolling contact machines
Rotary
101 401, 101178, B41F 518, B41F 524
Patent
active
048935590
ABSTRACT:
Method and apparatus for printing quasi random number tables comprising a printing press having one or more printing stations incorporating a plurality of endless belts, each entrained around a printing plate cylinder and an idle roller, each belt being a different length which is a multiple of a basic pitch value, and each belt having affixed to the outer surface thereof and arranged in a row along the length of the belt, a plurality of printing plates arranged to print an impression onto a web or other medium passing through the press in register with a similar impression printed by each other belt. In one form of the invention each plate prints a number such that each belt prints different numbers in register, forming larger numbers or tables whose digits change from impression to impression in a quasi random manner. In one form of the invention each printing station incorporates one said belt. In an alternative form of the invention at least one printing station incorporates a plurality of belts entrained about a common printing plate cylinder. Each belt may be inked from a common source or may be independently inked so that a number of different colors may be printed at the one station. Preferably, each belt is provided with a tension roller or shoe arranged to tension the belt about the printing plate and idle rollers. This is particularly important when a plurality of belts of different lengths are entrained about common printing plate and idle rollers at the same station.
REFERENCES:
patent: 2435791 (1948-02-01), Luehrs
patent: 2788738 (1957-04-01), Wood
patent: 3405633 (1968-10-01), Price, Jr. et al.
patent: 4538516 (1985-09-01), Aaron
patent: 4584939 (1986-04-01), Giori
patent: 4601239 (1986-07-01), Sillars
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