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US 4,399,767 AGranted
Varnishing unit in the delivery unit of a sheet-fed rotary printing press
AssigneeMAN Roland Druckmaschinen AG
InventorClaus Simeth
Life of this patent
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AssigneeMAN Roland Druckmaschinen AG
InventorClaus Simeth
Estimating the term…
An apparatus for varnishing a sheet being fed from a sheet fed printing press into a delivery unit, the sheet being conveyed by an endless loop conveyor made up of a pair of laterally spaced conveyor chains. Cross members extend between the chains at regular intervals carrying grippers for the leading edge of successive sheets. The chains are guided to form a delivery run and a return run spaced apart and generally parallel to one another. An applicator cylinder is journalled between the runs having an axial length which is shorter than the lateral spacing between the chains. A plate cylinder journalled in the frame outside of the return run is in rolling engagement with the applicator cylinder for supplying a varnish film thereto. A backing cylinder journalled in the frame outside of the delivery run is in rolling engagement with the applicator cylinder. The circumference of the cylinders equals the spacing between successive cross members and grippers. The applicator, plate, and backing cylinders have respective longitudinal grooves sufficiently large to provide free passage for the cross members and associated grippers. The cylinders are driven synchronously with the conveyor chains so that a sheet passing on the grippers is engaged between the applicator and backing cylinders for application of varnish to the sheet. The conveyor speed is less than the press speed in a predetermined ratio. The cylinders have a diameter less than the diameter of the cylinders in the associated press unit in the same ratio.
An apparatus for varnishing a sheet being fed from a sheet-fed printing press unit into a delivery unit comprising, in combination, a frame, guide rails in the frame, a pair of conveyor chains laterally spaced from one another on the guide rails to form an endless loop conveyor extending from the press unit to a delivery pile, the chains having cross members at regular intervals, grippers at the cross members for gripping the leading edge of a sheet, the guide rails being arranged to form a delivery run and return run spaced apart and generally parallel to one another, an applicator cylinder journalled in the frame in a position in which it is overlapped by each of the runs but having an axial length which is shorter than the lateral spacing between the chains, means supported on the frame outside of the return run and in rolling engagement with the applicator cylinder for supplying a film of varnish thereto, a backing cylinder journalled in the frame outside of the delivery run and in rolling engagement with the applicator cylinder, the circumference of the cylinders being equal to the spacing between the successive cross members and grippers, the applicator cylinder having a longitudinal groove sufficiently large to provide free passage for the cross members and associated grippers in both the delivery run and the return run, means for driving the cylinders in synchronism with the conveyor chains so that a sheet passing on the grippers is engaged between the applicator and backing cylinders for application of varnish to the sheet.
An apparatus for varnishing a sheet being fed from a sheet-fed printing press unit into a delivery unit comprising, in combination, a frame, guide rails in the frame, a pair of conveyor chains laterally spaced from one another on the guide rails to form an endless loop conveyor extending from the press unit to a delivery pile, the chains having cross members at regular intervals, grippers at the cross members for gripping the leading edge of a sheet, the guide rails being arranged to form a delivery run and return run spaced apart and generally parallel to one another, an applicator cylinder journalled in the frame between the runs having an axial length which is shorter than the lateral spacing between the chains, means supported on the frame outside of the return run and in rolling engagement with the applicator cylinder for supplying a film of varnish thereto, a backing cylinder journalled in the frame outside of the delivery run and in rolling engagement with the applicator cylinder, the circumference of the cylinders being equal to the spacing between the successive cross members and grippers, the applicator and backing cylinders having respective longitudinal grooves sufficiently large to provide free passage for the cross members and associated grippers, means for driving the cylinders in synchronism with the conveyor chains so that a sheet passing on the grippers is engaged between the applicator and backing cylinders for application of varnish to the sheet.
Dependencies are inferred from the claim text.