REGISTRATION SYSTEM FOR A VARIABLE REPEAT PRESS
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United States of America Patent
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Issued Date -
Jul 10, 2014
app pub date -
Jan 4, 2013
filing date -
Jan 4, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A method for phase adjusting a plurality of printing units in a variable format printing press is provided which includes for each of the plurality of printing units (P1 to Pn), determine an angular position (MBPosx) of a motor shaft of the motor driving the blanket cylinder of the printing unit when a plate edge of a plate mounted on the plate cylinder of the printing unit is in a nip formed between the plate cylinder and blanket cylinder of the printing unit, and for each of the printing units P2 to Pn, phase adjusting MBPosx relative to MBPos1 so that when edge E1 reaches a nip between the blanket cylinder and impression cylinder of printing unit Px, edge Ex is printed on the web. The step of phase adjusting includes calculating a number of stretched images between Px and P1, as a function of a nominal repeat length, a substrate modulus of the web, a web tension, and a distance between printing unit Px and printing unit P1; and based on the calculating step, calculating an phase adjusted angular position PMBPosx of the motor shaft of the motor driving the blanket cylinder of the printing unit Px when the motor shaft of the motor driving the blanket cylinder of the printing unit P1 is MBPos1; and rotating the blanket cylinders to reflect these relative positions.
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