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US 3,988,988 AGranted
Device for drying the surface of a blanket cylinder of ink washing solvent
AssigneeAddressograph Multigraph Corporation
InventorHarvey James Sable
Life of this patent
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AssigneeAddressograph Multigraph Corporation
InventorHarvey James Sable
Estimating the term…
A device for removing the solvent wash liquid that is applied to a lithographic blanket for the purpose of removing the residual ink image constructed of a pair of flat plates, separated from one another by a narrow height in the range of 0.005 inches to 0.06 inches, and which provides a capillary channel between the two plates for collecting liquid. The front edge of the lower plate is formed into a wiping edge which makes contact with the full width of the blanket and acts as a wiper blade for accumulating liquid at the entryway of the channel. Any liquid presented to the capillary channel immediately fills the channel and excess liquid flows out the back end of the channel by force of gravity into a collecting vessel. Optionally, a negative pressure pulse of short duration may be applied to the channel in order to assist in the rapid removal of any accumulated liquid within.
In a printing machine equipped with a rotatable resilient blanket adapted to carry on its surface a transferrable ink pattern to be transferred to a receiving surface, and including a solvent wash removal means comprising a liquid collector extending transverse the direction of rotation of said blanket cylinder and coextensive the width of said blanket, said collector having a capillary channel formed between upper and lower rigid plates in spaced apart relation to one another so as to form the capillary channel therebetween with an entryway adjacent the blanket surface for removing wash liquid applied to the blanket, wiping means adjacent said entryway for forming a liquid bead at the entryway to said channel, whereupon the liquid bead moves through and occupies said channel by capillary forces;
In a printing machine equipped with a rotatable resilient blanket adapted to carry on its surface a transferrable ink pattern to be transferred to a receiving surface and including means for solvent washing the ink pattern from the surface, the improvement comprising solvent wash removal means comprising a closed liquid collecting chamber having an entryway and exitway, said chamber extending substantially coextensive the width of said blanket adapted to receive a volume of liquid therein, and including upper and lower rigid plates in spaced apart relation to one another so as to form a channel therebetween extending between said entryway and exitway, said space between the plates being sufficiently small to collect said liquid and sustain liquid movement therein by capillary forces at atmospheric pressure and a wiper member associated with said lower plate for collecting and removing the liquid from the blanket surface and directing it to said entryway.
In a printing machine equipped with a rotatable resilient blanket adapted to carry on its surface a transferrable ink pattern to be transferred to a receiving surface and including solvent wash removal means comprising a closed liquid collecting chamber having an entryway and exitway, said chamber extending substantially coextensive the width of said blanket adapted to receive a volume of liquid therein, and including upper and lower rigid plates in spaced apart relation to one another so as to form a channel therebetween extending between said entryway and exitway, said space between the plates being sufficiently small to collect said liquid and sustain liquid movement therein by capillary forces;
Dependencies are inferred from the claim text.