US 4,833,986 AGranted

Holding and tensioning system for a cover layer on a printing machine cylinder

AssigneeMAN Roland Druckmaschinen AG

InventorIngo Kobler

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Abstract

To permit uniformly tensioning a holding strip (11) in which end portions (22, 23) of a cover layer such as a rubber blanket (24) can be inserted, the strip (11) is coupled to a plurality of rods (9) extending radially inwardly, and uniformly distributed over the axial length of the strip (11), the rods (9) being coupled to respective pistons (5) slidable in cylinder bores (4) worked in the bottom of the groove (2). Hydraulic or pneumatic pressure can be applied to one face of the piston, the opposite face of the piston being loaded by a spring (17). Thus, since the pressure being applied to all the pistons will be uniform, tensioning pressure (FIG. 2) will be uniform, or raising pressure (FIG. 3) will be uniform. Rather than using fluid pressure, other non-mechanical energy, such as electrical energy, can be used to raise the strip (11) by electromagnetic coupling of solenoids to the rods (9).

Claims15

Dependent claims

Holding and tensioning system for a cover layer (24) on a printing machine cylinder (1), and especially for holding and stretching a rubber blanket on a blanket cylinder of an offset printing machine, comprising

an axial groove (2) formed in the cylinder;
a holding strip (11) located in the cylinder and formed with laterally oppositely located recesses (13, 14) engaging end portions (22, 23) of the cover layer (24);
and
means for moving and securing said holding strip (11) into the groove (2) and retaining the cover layer on the cylinder at a tension uniformly applied over the axial length of the cylinder,
said holding and securing means comprising, in accordance with the invention,
a plurality of cylinder bores (4) formed as blind bores in the bottom (3) of the groove (2) extending inwardly of the cylinder, and uniformly distributed over the axial length of the cylinder;
a plurality of rod elements (9) coupled to said holding strip (11) and extending towards said cylinder bores;
axially movable pistons (5) secured to said rod elements (9) and operable in said cylinder bores (4);
fluid applying means to provide compressed fluid to act upon said pistons;
a cover plate (6) formed with an opening to permit passage of said rod elements (9) therethrough, covering the cylinder bores and sealing the cylinder bores against the bottom wall (3) of the groove;
and
circumferentially extending ledges (15, 16) extending from the outer end of said holding strip (11) at the same height, and from opposite sides thereof, and overlapping in part said recesses (13, 14) in the holding strip.

9 more elements

an axial groove (2) formed in the cylinder;
a holding strip (11) located in the cylinder and formed with laterally oppositely located recesses (13, 14) engaging end portions (22, 23) of the cover layer (24);
and
means for moving and securing said holding strip (11) into the groove (2) and retaining the cover layer on the cylinder at a tension uniformly applied over the axial length of the cylinder,
said holding and securing means comprising, in accordance with the invention,
a plurality of blind bores (4) formed in the bottom (3) of the groove (2) extending inwardly of the cylinder and uniformly distributed over the axial length of the cylinder;
a plurality of rod elements (9) coupled to said holding strip (11) and extending towards said blind bores;
a cover plate (6) formed with an opening to permit passage of said rod elements therethrough, covering the blind bores and sealing the blind bores against the bottom wall (3) of the groove;
solenoid means (24') electromagnetically coupled to said rod elements (9) and, upon energization, controlling the position of said rod elements;
and
circumferentially extending ledges (15, 16) extending from the outer end of said holding strip (11) at the same height, and from opposite sides thereof, and overlapping in part said recesses (13, 14) in the holding strip.

8 more elements

Dependencies are inferred from the claim text.