Apparatus and method for oscillating the form rollers in a printing press
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United States of America Patent
Stats
-
Jan 12, 1988
Grant Date -
N/A
app pub date -
May 2, 1986
filing date -
May 2, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for oscillating the form rollers in a lithographic printing press to apply a smooth, relatively uniform coating of ink to the ink-receptive areas of a lithographic printing plate. The apparatus is comprised of a shaft rotatable about its own axis and a roller concentrically disposed on the shaft. The roller is preferably comprised of a hollow cylindrical metal core surrounded by a rubber covering. First and second bronze bushings are partially inserted into the hollow core at respective opposite ends of the roller. The shaft has first and second shaft keys for mating with complementary first and second keyways formed in the respective first and second bushings to allow the bushings to engage the shaft for common rotation while allowing the roller and bushings to slide axially with respect to the shaft. First and second collar members are disposed at respective predetermined locations on the shaft for limiting the axial movement of the roller on the shaft between selected limits. In the preferred embodiment the apparatus is installed as a form roller device in a lithographic printing press. The form roller is rotated and moved axially substantially in unison with the rotation and axial movement of the corresponding vibrating roller.
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