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

• Current Assignee: Deneka P. Kenneth
• Original Assignee: Deneka P. Kenneth
• Inventors: Deneka, P. Kenneth
• Primary Examiner(s): FISHER, J REED
• Application Number:
  US09/040,209
• Time in Patent Office: 616 Days
• Field of Search: 101/350, 101/366, 101/363, 101/364, 101/207-210, 101/157, 101/158, 101/169, 118/259, 118/261
• US Class Current: 101/366
• CPC Class Codes: B41F 31/027 Ink rail devices for inking ink rollers

Abstract

A coating head device for coating an engraved surface on a coating cylinder of a printing press having a main body with a longitudinal cavity for liquid, open to the coating cylinder and substantially sealable to the coating cylinder. The cavity has an injection zone providing for a zone pressurizing the liquid within a portion of said cavity in the main body to compel liquid into cells in the engraved surface of the coating cylinder. The main body has an inlet to provide liquid to the supply chamber and a return to exhaust liquid from the outlet section.

Claims

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.

2. The coating head of claim 1, wherein said sealing means includes at least a pair of doctor blades and end seals disposed on said main body to seal said coating head against said coating cylinder whereby liquid supplied by said means to provide liquid may be substantially kept from leaking from an interface created by said coating head and said coating cylinder.

3. The coating head of claim 2, wherein the end seals are substantially 100% wool felt and petroleum jelly.

4. The coating head of claim 1, wherein the means to provide liquid is a means to provide ink.

5. 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 body to said coating cylinder, said cavity comprising a longitudinally disposed supply chamber, a longitudinally disposed return chamber, and a longitudinally disposed injection zone chamber disposed between and open to said supply chamber and said return chamber;

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

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

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

(e) said injection zone chamber having means to provide increased pressure of liquid flowing through said injection zone chamber at a substantially constant volumetric rate, said pressure peaking at a longitudinal center point of said injection zone chamber, 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 and an outlet having substantially equal and largest cross sectional areas within the injection zone chamber, said injection zone chamber narrowing to a point of least cross sectional area at a point substantially mid way 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 the coating cylinder and parallel to the axis of the 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

(f) said supply chamber and said return chamber each having substantially more volume than said injection zone chamber.

6. The coating head of claim 5, wherein the supply chamber and the return chamber are substantially half-circular in cross-section.

7. The coating head of claim 5, including at least a pair of doctor blades and end seals disposed on said main body to seal said coating head against said coating cylinder whereby liquid supplied by said means to provide liquid may be substantially kept from leaking from an interface created by said coating head and said coating cylinder.

8. A coating head device for use on a printing press having a coating cylinder with an engraved surface, 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, said cavity comprising a longitudinally disposed supply chamber, a longitudinally disposed return chamber and a longitudinally disposed injection zone chamber disposed between and open to said supply chamber and said return chamber;

(b) said supply chamber and said return chamber being substantially half-circular in cross section;

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

(d) said main body having means to exhaust liquid and air from said outlet section in the longitudinal cavity;

(e) a sealing means comprising at least one pair of doctor blades disposed on said main body and at least two end seals disposed on said main body to seal said coating head against said coating cylinder;

(f) said coating cylinder having an outer cylindrical surface;

(g) said injection zone chamber having means to provide increased pressure peaking at a longitudinal center point of said injection zone chamber, said injection zone chamber comprising a narrow open passageway connecting said supply chamber to said return chamber, adjacent said coating cylinder, wherein said passageway 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 the coating cylinder and bounded opposite the flat, planar surface by the outer cylindrical surface of said coating cylinder, said injection zone chamber having an inlet and an outlet having equal cross sections, said inlet and outlet having substantially equal and largest cross sectional areas within the injection zone chamber, said injection zone chamber narrowing to a point of least cross sectional area at a point substantially midway between the inlet and the outlet, said injection zone chamber betting 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

(h) said supply chamber and said return chamber each having substantially more volume than said injection zone chamber.

9. A printing press apparatus comprising:

(a) a rotatable coating cylinder having an engraved surface, said engraved surface comprising a plurality of cells;

(b) a rotatable printing cylinder in rolling contact with said coating cylinder having a printing plate mounted thereon;

(c) a rotatable backing cylinder disposed adjacent said printing cylinder such that printing material may be fed through a slot created between said printing cylinder and said backing cylinder; and

(d) a coating head device for coating said engraved surface on said coating cylinder comprising;

(i) a main body having a longitudinal cavity for liquid, open to said coating cylinder and a sealing means for substantially sealing 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 zone pressurizing said liquid within a portion of said cavity in said main body;

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

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

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

(f) said injection zone chamber comprising a narrow passageway between said supply chamber and said return chamber, adjacent said coating cylinder, wherein said passageway 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 planar surface parallel to a tangent of said outer cylindrical surface of said coating cylinder, said injection zone chamber having an inlet and an outlet having equal cross sections, said inlet and outlet having substantially equal and largest cross sectional areas within the injection zone chamber, said injection zone chamber narrowing to a point of least cross sectional area at a point substantially midway between the inlet and outlet, 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.

10. The printing press of claim 9, wherein the sealing means includes at least a pair of doctor blades and end seals disposed on said main body to seal said coating head against said coating cylinder whereby liquid supplied by said means to provide liquid may be substantially kept from leaking from an interface created by said coating head and said coating cylinder.

11. The printing press apparatus of claim 10, wherein the sealing means includes end seals that are substantially 100% wool felt used in conjunction with petroleum jelly.

12. The printing press apparatus of claim 9, wherein the means to provide liquid is a means to provide ink.

13. A printing press apparatus comprising:

(a) a rotatable coating cylinder having an engraved surface, said engraved surface comprising a plurality of cells, the coating cylinder having means to rotate on an axis;

(b) a rotatable printing cylinder in rolling contact with said coating cylinder having a printing plate mounted thereon;

(c) a rotatable backing cylinder disposed adjacent said printing cylinder such that printing material may be fed through a slot created between said printing cylinder and said backing cylinder;

(d) a pump for supplying liquid to a coating head device; and

(e) said coating head device for coating said engraved surface on said coating cylinder comprising;

(i) a main body having a longitudinal liquid cavity open to said coating cylinder and having a sealing means to substantially seal said main body to said coating cylinder, said cavity comprising a longitudinally disposed supply chamber, a longitudinally disposed return chamber and a longitudinally disposed injection zone chamber disposed between and open to said supply chamber and said return chamber;

(ii) said main body having means to provide liquid to said supply chamber in the longitudinal cavity, supplied by said pump;

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

(iv) said injection zone chamber having means to provide increased pressure of liquid flowing through said zone at a substantially constant volumetric rate, said pressure peaking at a longitudinal center point of said injection zone chamber; and

(v) said supply chamber and said return chamber each having substantially more volume than said injection zone chamber;

(vi) said coating cylinder having an outer cylindrical surface that has means to spin on an axis; and

(vii) said injection zone chamber comprising a narrow passageway between said supply chamber and said return chamber, adjacent said coating cylinder, wherein said passageway 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 the coating cylinder and bounded opposite the flat, planar surface by the outer cylindrical surface of said coating cylinder, said planar surface parallel to a tangent of said outer cylindrical surface of said coating cylinder, said injection zone chamber having equal cross sections, said inlet and outlet having a substantially equal and largest cross sectional areas within the injection zone chamber, said injection zone chamber narrowing to a point of least cross sectional area at a point substantially midway between the inlet and the outlet, 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.

14. The printing press of claim 13, wherein said sealing means comprises at least a pair of doctor blades and end seals disposed on said main body to seal said coating head against said coating cylinder whereby liquid supplied by said means to provide liquid may be substantially kept from leaking from an interface created by said coating head and said coating cylinder.

15. A printing press apparatus comprising:

(a) a rotatable coating cylinder having an engraved surface and means to rotate on an axis, said engraved surface comprising a plurality of cells;

(b) a rotatable printing cylinder in rolling contact with said coating cylinder having a printing plate mounted thereon;

(c) a rotatable backing cylinder disposed adjacent said printing cylinder such that printing material may be fed through a slot created between said printing cylinder and said backing cylinder;

(d) a pump to supply liquid to a coating head device;

(e) said coating head device for coating said engraved surface on said coating cylinder comprising;

(i) a main body having a longitudinal cavity, said cavity comprising a longitudinally disposed supply chamber, a longitudinally disposed return chamber and a longitudinally disposed injection zone chamber disposed between and open to said supply chamber and said return chamber;

(ii) said supply chamber and said return chamber being substantially half-circular in cross section;

(iii) said main body having at least one orifice for supplying liquid to said supply chamber supplied by said pump;

(iv) said main body having means to exhaust liquid and air from said outlet section;

(v) a sealing means comprising at least one pair of doctor blades disposed on said main body and at least two end seals disposed on said main body to seal said main body of said coating head against said coating cylinder;

(vi) said injection zone chamber having means to provide increased pressure peaking at a longitudinal center point of said injection zone chamber;

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

(viii) said injection zone chamber comprising a narrow passageway between said supply chamber and said return chamber, adjacent said coating cylinder, wherein said passageway is bounded on one side by a 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 the coating cylinder and bounded opposite the flat, planar surface by the outer cylindrical surface of said coating cylinder, said planar surface parallel to a tangent of said outer cylindrical surface of said coating cylinder, said injection zone chamber having an inlet and an outlet, said inlet and outlet having substantially equal and largest cross sectional areas within the injection zone chamber, said injection zone chamber narrowing to a point of least cross sectional area at a point substantially midway between the inlet and the outlet, 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;

(ix) said supply chamber and said return chamber each having substantially more volume than said injection zone chamber.