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Printing coating head device

  • US 5,988,064 A
  • Filed: 03/17/1998
  • Issued: 11/23/1999
  • Est. Priority Date: 10/18/1995
  • Status: Expired due to Term
First Claim
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1. A coating head device for coating an engraved surface on a coating cylinder of a printing press, where the coating cylinder has means to rotate on an axis, comprising:

  • (a) a main body, mounted parallel to the axis of the coating cylinder, having a longitudinal cavity for liquid, open to said coating cylinder and having a sealing means to substantially seal said main body to said coating cylinder, said cavity having a supply chamber and a return chamber with an injection zone chamber disposed between and open to the supply chamber and the return chamber, said injection zone chamber providing for a liquid pressurizing zone within a portion of said cavity in said main body;

    (b) said main body having means to provide liquid to a supply chamber in the longitudinal cavity;

    (c) said main body having means to exhaust said liquid and air from said return chamber in the longitudinal cavity;

    (d) said coating cylinder having an outer cylindrical surface; and

    (e) said injection zone chamber comprising a narrow open passageway connecting said supply chamber to said return chamber, adjacent said coating cylinder, said injection zone chamber having an inlet from the supply chamber and an outlet to the return chamber, said inlet and outlet having substantially equal and largest cross sectional areas within the injection zone chamber, said injection zone chamber smoothly narrowing to a point of least cross sectional area at a point substantially midway between the inlet and outlet, wherein said injection zone chamber is bounded on one side by a flat, planar surface on said main body that is parallel to a tangent of said cylindrical surface of said coating cylinder and parallel to the axis of said coating cylinder and bounded opposite the flat, planar surface by the outer cylindrical surface of said coating cylinder, said injection zone chamber being symmetric relative to the axis of the coating cylinder, said injection zone chamber providing means to initially provide compressive force to the liquid passing through the injection zone chamber that builds to a peak at the midway point of the injection zone chamber and then provides for a substantially equal decrease in compressive force.

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