EP0047618A1
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EP
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A rotogravure printing press
Assignee: Crosfield Electronics Ltd
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Filing: 1981-09-01
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Granted: —
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Expires: 2001-09-01
Abstract
Abstract A rotogravure printing press includes a printing member (1) having an at least partly cylindrical ink receiving matrix and at least one inking assembly including an ink channel (3) extending in the axial direction of and open towards the printing member (1). The ink channel is divided into two parts by a blade (4) pivoted around an axis extending parallel to the axis of the printing member (1) with means (10) to supply ink to the one side of the pivoted blade (4) and a drain (21) on the other side. The press also includes means (18, 19) to rotate the blade (4) about its axis, a doctor blade (6) on the one side of the pivoted blade (4) and means (18, 19) to move the doctor blade (6) into and out of contact with the surface of the printing member (1). The press is arranged such that, in use, the means (18,19) pivots the pivoted blade away from the one side to allow ink from the channel (3) to flood the ink receiving matrix of the printing member (1) with the doctor blade (6) removing ink from the surface of the printing member (1), surplus ink passing over and down the other side of the pivoted blade (4) into the drain (21) and, to stop the supply of ink, the means (18, 19) pivots the pivoted blade (4) towards the one side to shut off the supply of ink and allow any remaining ink to flow into the drain (21) before the doctor blade is moved out of contact with the surface of the printing member (1). Preferably the doctor blade (6) forms the downstream side wall of the ink channel (3) and the pivoted blade (4) seats and forms a seal against the doctor blade (6) to shut off the supply of ink.
Inventors
- 👤 Peter Charles Pugsley
- 👤 David Walter Parkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
B; B41; B41F; B41F9/00; B41F9/06; B41F9/061; B41F9/065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
270 words
A rotogravure printing press including a printhg member having an at least partly cylindrical ink receiving matrix (1) and at least one inking assembly including an ink applicator, a doctor blade downstream from the ink applicator and means to move the doctor blade (6) into and out of contact with the surface of the printing member (1), characterised in that the ink applicator comprises an ink channel (3) extending in the axial direction of and open towards the printing member (1), the ink channel being divided into two parts by a blade (4) pivoted around an axis extending parallel to the axis of the printing member (1) with means (10) to supply ink to the one side of the pivoted blade (4) and a drain (21) on the other side, and means (18, 19) to rotate the pivoted blade (4) about its axis, the arrangement being such that, in use, the means (18,19) pivots the pivoted blade (4) away from the one side to allow ink from the channel (3) to flood the ink receiving matrix of the printing member (1) with the doctor blade (6) removing ink from the surface of the printing member (1), surplus ink passing over and down the other side of the pivoted blade (4) into the drain (21), and, to stop the supply of ink, the means (18, 19) .pivots the pivoted blade (4) towards the one side to shut off the supply of ink and allow any remaining ink to flow into the drain (21) before the doctor blade (6) is moved out of contact with the surface of the printing member (1).
Claim 2
Dependent Claim
270 words
A rotogravure printing press including a printhg member having an at least partly cylindrical ink receiving matrix (1) and at least one inking assembly including an ink applicator, a doctor blade downstream from the ink applicator and means to move the doctor blade (6) into and out of contact with the surface of the printing member (1), characterised in that the ink applicator comprises an ink channel (3) extending in the axial direction of and open towards the printing member (1), the ink channel being divided into two parts by a blade (4) pivoted around an axis extending parallel to the axis of the printing member (1) with means (10) to supply ink to the one side of the pivoted blade (4) and a drain (21) on the other side, and means (18, 19) to rotate the pivoted blade (4) about its axis, the arrangement being such that, in use, the means (18,19) pivots the pivoted blade (4) away from the one side to allow ink from the channel (3) to flood the ink receiving matrix of the printing member (1) with the doctor blade (6) removing ink from the surface of the printing member (1), surplus ink passing over and down the other side of the pivoted blade (4) into the drain (21), and, to stop the supply of ink, the means (18, 19) .pivots the pivoted blade (4) towards the one side to shut off the supply of ink and allow any remaining ink to flow into the drain (21) before the doctor blade (6) is moved out of contact with the surface of the printing member (1).
Claim 3
Dependent Claim
45 words
A printing press according to claim 1, in which the doctor blade (6) forms the downstream side wall of the ink channel (3) and the pivoted blade (4) seats and forms a seal against the doctor blade (6) to shut off the supply of ink.
Claim 4
Dependent Claim
52 words
A printing press according to claim 1 or 2, in which the inking assembly moves towards and away from the printing member (1) during each revolution of the printing member and in which the ink channel (3) is also pivoted about an axis parallel to the axis of the printing member (1).
Claim 5
Dependent Claim
91 words
A printing press according to claim 3, which further includes resilient means (15) to provide the appropriate contact pressure between the doctor blade (6) and the surface of the printing member (1) ) and in which the pivoted blade engages against the doctor blade (6) to shut off the ink, further movement of the means (18,19) and the pivoted blade (4) causing the entire ink channel (3) to pivot about its axis against the resilient means (15) to move the inking assembly away from the surface of the printing member (1).
Claim 6
Dependent Claim
46 words
A pricing press according to any one of the preceding claims, in which the ink channel (3) includes a containing blade (5) upstream of the pivoted blade (4) the containing blade (5) bearing against, or being arranged close to the surface of the printing member (1).
Claim 7
Dependent Claim
66 words
A printing press according to claim 5 when dependent upon claim 4, in which the containing blade (5) is located in front of the pivot axis of the inking assembly (3) so that, when the inking assembly (3) pivots to remove the doctor blade (6) away from the surface of the printing member the containing blade (5) is also moved away from the printing member (1).
Claim 8
Dependent Claim
44 words
A printing press according to any one ' of the preceding claims, which also includes a vacuum source (20) coupled to the drain (21) to draw any excess ink that flows over the top of the pivoted blade (4) down into the drain (21).
Claim 9
Dependent Claim
132 words
A printing press according to any one of the preceding claims, which includes only a single inking assembly, in which the printing member is a gravure plate, and in which the means (18,19) are arranged to move the blade (4) and move the doctor blade (6) out of contact with the gravure plate (1) once during each revolution of the printing member just after the end of the ink receiving matrix has passed and just before the end of the plate reaches the inking assembly and return the doctor blade (6) into contact with the gravure plate and move the blade (4) to restore the ink supply just after the other end of the plate has passed and just before the start of the ink receiving matrix has reached the inking assembly.
Claim 10
Dependent Claim
107 words
A printing press according to any one of claims 1 to 7, which includes two or more inking assemblies, in which the ink receiving matrix of the printing member includes two or more different colour separations and in which the means (18,19) to move the pivoted blade (4) and the doctor blade (6) of each inking assembly are arranged to move the blades (4 and 6) once during each revolution of the printing member, with the timing of the movement being such that each inking assembly only applies ink to the ink receiving matrix corresponding to the colour separation for the ink contained in that inking assembly.
References Cited (Backward Citations)
No citation records indexed.
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