| 摘要 |
To permit double inking of the blanket cylinder (6, 7; 44, 45) of an offset printing machine, in which all the cylinders are the same, and further to permit retrofitting of an existing printing machine, a control unit (C) is connected to the blanket cylinders which are located in movable bearings to engage or disengage the blanket cylinders, in intermittent movement, from a cooperating impression cylinder (8, 9; 46) when a sheet supply apparatus (3, 41) is commanded to feed a sheet only for every other revolution of the printing system, thereby permitting double inking of the blanket cylinder and preventing contact of the inked blanket cylinder with the impression cylinder when no sheet is being fed thereto. |
