Rotary printing machine with web tear clearing system
AssigneeMAN Roland Druckmaschinen AG
InventorHermann Fischer
Life of this patent
Estimating the term…
Abstract
To prevent introduction of paper scraps or torn paper into the inker of a web printing machine, a web paper tear sensor (17, 18) controls a hydraulic or pneumatic cylinder-piston unit (25) which severs engagement between an ink supply roller (13) and an ink application roller (12) while maintaining contact of the ink application roller with the plate cylinder (4) of the printing machine; the greater quantity of ink on the ink application roller will cause paper to adhere to the ink application roller, and thus wrap itself about that roller, severance of contact with the ink supply roller (13) preventing introduction of torn paper into the inker.
Claims13
Rotary printing machine having
- a plate cylinder (4);
- an inker (12-16) applying ink to the plate cylinder including an ink roller train (14-16);
- an ink supply roller (13), and
- an ink application roller (12) in surface contact with the plate cylinder (4) and the ink supply roller (13);
- and means (17-24) sensing tearing of paper being supplied to the printing machine and, upon detecting torn paper, providing a "torn paper" signal,
- comprising, in accordance with the invention,
- means for preventing damage to the printing machine and transport of torn paper into the ink roller train in case of tearing of paper being supplied to the printing machine, including separating means (25, 30, 35) coupled to the ink application roller (12), controlled by and responsive to a "torn paper" signal from the paper tearing sensing means for removing the ink application roller (12) from contact with the ink supply roller (13) while maintaining resilient yielding engagement with the plate cylinder (4) so as to permit the broken web to wrap around the ink application roller.
Dependencies are inferred from the claim text.