Device for two-sided printing
AssigneeHeidelberger Druckmaschinen AG
InventorThomas Schmidt
Life of this patent
Estimating the term…
Abstract
A device for two-sided printing of sheet-shaped printing substrates includes an impression cylinder on which the printing substrate is guided through more than 360°. As a result of being guided through more than 360°, the second side of the sheet is moved into an effective region of an ink application unit that has already printed a first side of the printing substrate as it was guided on an upstream impression cylinder.
Claims11
A device for two-sided printing of sheet-shaped printing substrates, the device comprising:
- a first upstream impression cylinder, a second impression cylinder adjacent said first upstream impression cylinder and a third impression cylinder adjacent said second impression cylinder;
- an ink application unit having an effective region, said ink application unit initially printing a first side of the printing substrate on said first upstream impression cylinder in said effective region;
- and
- said second impression cylinder carrying the printing substrate thereon through more than a 360° revolution and thereby guiding the printing substrate past said third impression cylinder without transferring the printing substrate to said third impression cylinder and said second impression cylinder moving a second side of the printing substrate once again into said effective region of said ink application unit.
A method for two-sided printing of sheet-shaped printing substrates, the method comprising the following steps:
- providing a first upstream impression cylinder, a second downstream impression cylinder adjacent the first upstream impression cylinder, a third impression cylinder adjacent the second downstream impression cylinder and an ink application unit having an effective region;
- initially printing a first side of the printing substrate on said first upstream impression cylinder in said effective region of said ink application unit;
- then carrying the printing substrate on said second downstream impression cylinder through more than a 360° revolution and thereby guiding the printing substrate past the third impression cylinder without transferring the printing substrate to the third impression cylinder and moving a second side of the printing substrate once again into said effective region of said ink application unit;
- and
- then printing the second side of the printing substrate on said second downstream impression cylinder in said effective region of said ink application unit.
Dependencies are inferred from the claim text.