US 4,742,769 AGranted

Printing cylinder and axial groove filler combination

AssigneeMAN Roland Druckmaschinen AG

InventorReinhard Zeller

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Abstract

Roll-off shocks of cylinders, typically rubber blanket cylinders with respect to each other, are ameliorated or avoided by inserting a filler element into the groove which is located in the median third of the cylinder, but does not extend over the entire length thereof. The filler element is supported on the bottom of the groove, preferably over a damping or resilient element, and has a dimension which is equal to the outer circumference (44) of the bearer ring or the theoretical pitch circle (45) of a drive gear of the cylinder, with tolerance of not more than about .+-.0.05 mm. In order to insert the filler elements into the respcective grooves, the cover layers or, if necessary, also the substrate supports of rubber blankets, are removed in the region of the axial length of the filler element. Preferably, the filler elements are made of metal.

Claims28

Dependent claims

In a printing machine system having

a first cylinder having a bearer ring and a cylinder cover, said first cylinder (1, 19) having an axial groove (8, 24) defining groove edges (9, 10;
25, 26) which define the perimeter of the groove, said groove being adapted for retaining said cylinder cover on said cylinder and defining a base, or root, the cylinder being circumferentially supported by the circumference (44) of said bearer ring;
wherein the first cylinder defines three adjacent axial zones of about one-third axial length each and
means are provided for improving the running smoothness of said cylinder, comprising
a filler element (13, 31), located in the axial groove, said filler element being of lesser axial length than said cylinder, and located only in the center third axial zone of the cylinder (1, 19),
said filler element being supported on the base (11, 30) of the groove (8, 24) and being further supported on at least one of the groove edges (9, 10;
25, 26), said filler element having an outer part-circular contour (16, 32) having a radius of curvature which is identical to the radius of curvature (44) of the bearer ring, with a tolerance of not more than about .+-.0.05 millimeters;
and
wherein said system further includes a second cylinder (1', 19') having, at least in the region of said filler element of lesser axial length, a cylindrical surface (13, 31') to form a counter surface for said filler element (13, 31).

6 more elements

In a printing machine system having

a first cylinder having a drive gear and a cover, said first cylinder (1, 19) having an axial groove (8, 24) defining groove edges (9, 10;
25, 26) which define the perimeter of the groove, said groove being adapted for retaining said cylinder cover on said cylinder and defining a base, or root, the cylinder being circumferentially supported by said drive gear, said drive gear defining a theoretical pitch circle (45),
wherein the first cylinder defines three adjacent axial zones of about one-third axial length each and
means are provided for improving the running smoothness of said cylinder, comprising
a filler element (13, 31), located in the axial groove, said filler element being of lesser axial length than said cylinder, and located only in the center third axial zone of the cylinder (1, 19),
said filler element being supported on the base (11, 30) of the groove (8, 24) and being further supported on at least one of the groove edges (9, 10;
25, 26), said filler element having an outer part-circular contour (16, 32) having a radius of curvature (44) which is identical to the theoretical pitch circle (45) of the drive gear, with a tolerance of not more than about .+-.0.05 millimeters;
and
wherein said system further includes a second cylinder (1,', 19') having, at least in the region of said lesser axial length, a cylindrical surface (13', 31') to form a counter surface for said filler element (13, 31).

6 more elements

Dependencies are inferred from the claim text.