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US 4,044,672 AGranted
Printing machine, in particular an office offset machine with means for pre-curving the master
AssigneeZeuthen & Aagaard A/S
InventorTheodor Wilhelm Gorr
Life of this patent
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AssigneeZeuthen & Aagaard A/S
InventorTheodor Wilhelm Gorr
Estimating the term…
A printing machine, especially an office offset printing machine, in which a master before being wrapped around the master cylinder is pre-curved by sliding over an edge of one pivotable part of a bipartite table which part is tilted manually during the mounting of the master to expose said edge against which the master is guided by a roller positioned above the table and by a guiding and operating member arranged between the two parts of the table. The curvature may be preadjusted in accordance with the characteristics of the master by adjusting the relative end positions of said roller and said table edge. The end of the movable table part closest to the master cylinder forms together with a guiding plate a slot which guides the master until it is gripped by the master cylinder. By actuating a handle and thereby raising one end of the movable table part the other end is lowered and thus said slot facing the master cylinder is opened to avoid straightening of the pre-curved master.
A printing machine comprising a frame, a cylinder mounted on said frame with gripping members for a master to be wrapped around said cylinder, a table mounted on said frame along which the master is advanced to said cylinder during the mounting operation, said table comprising two parts, a stationary table part and a movable table part having front and rear edges, said front edge of said movable table part being positioned closer to said cylinder than said rear edge, said movable table part being located closer to the master cylinder than said stationary table part and pivotable around an axis positioned intermediate its front and rear edges which is parallel to the plane of said table and at right angles to the direction of advance of the master, a pivotable operating member positionable in contact with said movable table part for pivoting said movable table part about said axis, a stationary shaft mounted on said frame, and a guiding roller mounted rotatably around said stationary shaft and contactable by said master when being mounted, said movable table part being pivotable into a position in which its rear edge is located at a short distance from said guiding roller to enable the master to pass therebetween and alter the direction of travel of the master and to provide a means for giving pre-curvature to the master as it is advanced along the movable table part.
An offset office printing machine comprising a frame, a master cylinder with gripping members for a master to be wrapped around said cylinder, a table along which the master is advanced to said cylinder during the mounting operation wherein said table comprises a stationary table part and a movable part having front and rear edges, said front edge of said movable table part being positioned closer to said cylinder than said rear edge and closer to said cylinder than said stationary table part and pivotable around an axis parallel to the plane of said table and at right angles to the direction of advance of the master, means for pivoting the rear edge of the movable table part upwardly into a tilted position, a roller having an axle mounted in the machine parallel with said rear edge for guiding said master closely around said rear edge, said means for tilting said movable table part comprising a pivotable bracket member carrying a table-operating and master-guiding angular member having a leg which protrudes under said rear edge of said movable table part and carries at least one contacting member for pressing against the underside of said movable table part and forcing it to pivot.
Dependencies are inferred from the claim text.