Film dampening system for a rotary offset press
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United States of America Patent
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-
Mar 9, 1993
Grant Date -
N/A
app pub date -
Jun 21, 1991
filing date -
Jun 21, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A film dampening system for a rotary offset press has a pan roller (101) rotated by a variable speed electric motor (111), the pan roller being covered with a hydrophilic material and being partially immersed in a trough (107) containing dampening solutions; an elastomer-covered metering roller (102) rotating at a speed related to the speed of the pan roller (101); a dampening drum (103) fitted with hydrophilic material; and an elastomer-covered dampening roller (104) in contact with the dampening drum (103) and with the plate cylinder (105) of the press. The dampening drum (103) is selectively driven either from the metering roller (102), in which case inter-roller differential slipping is established between the dampening drum and the dampening roller (104), or else from the plate cylinder (105), in which case inter-roller differential slipping is established between the dampening drum and the metering roller (102), the selective drive for the dampening drum (103) thus making it equally possible to use either one of two different dampening modes. The film dampening system is applicable to the field of offset printing.
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