Mechanism for applying lacquers and the like on a printing press

Claim 2

For use with a sheet-fed printing press, means for applying a liquid coating material to a sheet following the printing thereof which comprises a main frame, a back-up cylinder journaled in the main frame, means including grippers for transferring a sheet to the back-up cylinder for transport thereon and for removing the sheet therefrom for delivery, a form cylinder journaled in the main frame in rolling engagement with the back-up cylinder, means for driving the cylinders and gripper means in unison, a fountain assembly including a fountain for the coating material, a fountain roller rotating therein adjacent the form cylinder, a first form roller adjacent the form cylinder, a dosing roller communicatingly interposed between the fountain roller and the first form roller, and a second form roller interposed between the fountain roller and the back-up cylinder, and means for selectively shifting the fountain roller and form rollers with respect to the main frame to (a) bring the fountain roller into exclusive liquid transmitting contact with the form cylinder, to (b) bring the first form roller into exclusive liquid transmitting contact with the form cylinder and to (c) bring the second form roller into exclusive liquid transmitting contact with the back-up cylinder thereby to change the length of the liquid transference path from the fountain to the sheet in accordance with the drying speed of the coating material and to insure evenly distributed liquid application of the coating material to the sheet.

Claim 3

For use with a sheet-fed printing press, means for applying a liquid coating material to a sheet following the printing thereof which comprises a main frame, a back-up cylinder journaled in the main frame, means including grippers for transferring a sheet to the back-up cylinder for transport thereon and for removing a sheet therefrom for delivery, a form cylinder journaled in the main frame in rolling engagement with the back-up cylinder, means for driving the cylinders and gripper means in unison, a fountain assembly having a subframe mounted on the main frame and shiftable with respect to it, the fountain assembly including a fountain for the coating material, a fountain roller rotating therein adjacent the form cylinder, a form roller adjacent the form cylinder, a dosing roller communicatingly interposed between the fountain roller and the form roller, and means for selectively shifting the subframe with respect to the main frame into alternative conditions to (a) bring the fountain roller into exclusive liquid transmitting contact with the form cylinder and to (b) bring the form roller into exclusive liquid transmitting contact with the form cylinder thereby to change the length of the liquid transference path from the fountain to the sheet in accordance with the drying speed of the coating material to insure evenly distributed liquid application of the coating material to the sheet.

Claim 4

For use with a sheet-fed printing press, means for applying a liquid coating material to a sheet following the printing thereof which comprises a main frame, a back-up cylinder journaled in the main frame, means including grippers for transferring a sheet to the back-up cylinder for transport thereon and for removing a sheet therefrom for delivery, a form cylinder journaled in the main frame in rolling engagement with the back-up cylinder, means for driving the cylinders and gripper means in unison, a fountain assembly having a subframe mounted on the main frame and shiftable with respect to it, the fountain assembly including a fountain for the coating material, a fountain roller rotating therein adjacent the form cylinder, a form roller adjacent the form cylinder, a dosing roller communicatingly interposed between the fountain roller and the form roller, and means for selectively shifting the subframe with respect to the main frame into alternative conditions to (a) bring the fountain roller into exclusive liquid transmitting contact with the form cylinder and to (b) bring the form roller into exclusive liquid transmitting contact with the form cylinder thereby to change the length of the liquid transference path from the fountain to the sheet in accordance with the drying speed of the coating material to insure evenly distributed liquid application of the coating material to the sheet.

Claim 5

The combination as claimed in claim 2 in which a separate drive independent of the press drive is provided for the fountain roller.

Claim 6

The combination as claimed in claim 3 in which the drive is provided with speed adjusting means permitting a surface speed lower than press speed for controlling the rate at which the liquid coating material is fed from the fountain.

Claim 7

For use with a sheet-fed printing press, means for applying a liquid coating material to a sheet following the printing thereof which comprises a main frame, a back-up cylinder journaled in the main frame, means including grippers for transferring a sheet to the back-up cylinder for transport thereon and for removing the sheet therefrom for delivery, a form cylinder journaled in the main frame in rolling engagement with the back-up cylinder, means for driving the cylinders and gripper means in unison, a fountain assembly including a fountain for the coating material, a fountain roller rotating therein adjacent the form cylinder, a first form roller adjacent the form cylinder, a dosing roller communicatingly interposed between the fountain roller and the first form roller, and a secoond form roller interposed between the fountain roller and the back-up cylinder, and means for selectively shifting the fountain roller and form rollers with respect to the main frame to (a) bring the fountain roller into exclusive liquid transmitting contact with the form cylinder, to (b) bring the first form roller into exclusive liquid transmitting contact with the form cylinder and to (c) bring the second form roller into exclusive liquid transmitting contact with the back-up cylinder thereby to change the length of the liquid transference path from the fountain to the sheet in accordance with the drying speed of the coating material and to insure evenly distributed liquid application of the coating material to the sheet, the rollers being surfaced to produce an alternating hard-soft liquid transfer sequence and the cylinders being driven without reversal of direction during all three exclusive liquid transmitting modes.

Claim 8

For use with a sheet-fed printing press, means for applying a liquid coating material to a sheet following the printing thereof which comprises a main frame, a back-up cylinder journaled in the main frame, means including grippers for transferring a sheet to the back-up cylinder for transport thereon and for removing the sheet therefrom for delivery, a form cylinder journaled in the main frame in rolling engagement with the back-up cylinder, means for driving the cylinders and gripper means in unison, a fountain assembly including a fountain for the coating material, a fountain roller rotating therein adjacent the form cylinder, a first form roller adjacent the form cylinder, a dosing roller communicatingly interposed between the fountain roller and the first form roller, and a secoond form roller interposed between the fountain roller and the back-up cylinder, and means for selectively shifting the fountain roller and form rollers with respect to the main frame to (a) bring the fountain roller into exclusive liquid transmitting contact with the form cylinder, to (b) bring the first form roller into exclusive liquid transmitting contact with the form cylinder and to (c) bring the second form roller into exclusive liquid transmitting contact with the back-up cylinder thereby to change the length of the liquid transference path from the fountain to the sheet in accordance with the drying speed of the coating material and to insure evenly distributed liquid application of the coating material to the sheet, the rollers being surfaced to produce an alternating hard-soft liquid transfer sequence and the cylinders being driven without reversal of direction during all three exclusive liquid transmitting modes.