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US 4,901,641 AGranted
Printing press
AssigneeBobst SA
InventorsJean-Pierre Steiner, Thomas Byro
Life of this patent
Estimating the term…
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AssigneeBobst SA
InventorsJean-Pierre Steiner, Thomas Byro
Estimating the term…
A printing press unit for a printing press system which has a main frame with an impression roller mounted for rotation on a first axis characterized by a sub-frame being mounted for pivotal movement around a second axis and supporting a printing cylinder which will be moved into contact with the web passing between the impression roll and the cylinder. The sub-frame can be laterally adjusted along the second axis and the second axis can be skewed as necessary for purposes of registration of the web during a printing process. For a rotogravure printing, the ink applicator and doctor blade holder are both releasably mounted on positoning assemblies which are provided on the sub-frame. In addition, an ink pad is held beneath the printing cylinder by an arm, which can is pivotably connected to the main frame and can be vertically raised and lowered so that the pan receives the cylinder as it is released from the sub-frame, then lowers the cylinder to a level to clear the portions of the press and is then pivoted out of the press for exchange. During this exchange, the ink applicator and doctor blade holder can also be quickly removed. The press can also be modified to receive an inking and transfer roller for a flexo printing process as the printing roller is mounted in the first sub-frame.
A printing press comprising a main frame having a pair of side frame members spaced apart, an impression roll mounted for rotation in said side frame members on a first axis extending between the pair of side frame members, a sub-frame, means mounting said sub-frame in the main frame for pivotal movement around a second axis offset from the first axis, said means for mounting enabling a lateral movement of the sub-frame on said second axis and skewing of said second axis relative to said first axis, said sub-frame having chucking means for releasably mounting a printing cylinder for rotation in the sub-frame on a third axis, means for pivoting the sub-frame on said second axis to move a printing surface of the printing cylinder into printing engagement with a web extending between said printing cylinder and said impression roll, inking means for applying printing ink to said printing surface of said printing cylinder, web-guide means including a plurality of rollers mounted to extend between said side frame members for receiving a web entering the press, guiding the web to pass between the impression roll and printing cylinder and for guiding the web out of the press, and means mounted on the sub-frame for rotating at least said printing cylinder.
A printing press comprising a main frame having a pair of spaced apart side frame members, an impression roll mounted for rotation in the main frame and extending between said spaced apart pair of side frame members and rotating on a first axis, a sub-frame, means mounting the sub-frame in the main frame for movement around a second axis offset from the first axis, said means for mounting enabling movement along said second axis and skewing of said second axis relative to said first axis, chucking means for releasably mounting a printing cylinder for rotation on a third axis being mounted on said sub-frame, means for pivoting the sub-frame on said second axis to move a printing surface of the printing cylinder into printing engagement with a web extending between said printing cylinder and impression roll, means mounted on said sub-frame for applying printing ink to said printing cylinder, means including a plurality of rollers mounted in the main frame for receiving a web entering the press, guiding the web to pass between the impression roll and printing cylinder and for guiding the web out of the press, means mounted on the sub-frame for rotating said printing cylinder, and means mounted on one of the side frame members for pivotable movement from a position beneath a printing cylinder to a position outside of said frame and including an arm supporting an ink pan beneath said cylinder, means for raising and lowering said arm so that the ink pan engages said cylinder when the cylinder is released by said chucking means so that the pan and cylinder can be removed from the press simultaneously.
A rotogravure printing press comprising a main frame having a pair of spaced apart side frame members, an impression roll mounted for rotation in the main frame and extending between said spaced apart pair of side frame members and rotating on a first axis, a sub-frame, means mounting the sub-frame in the main frame for movement around a second axis offset from the first axis, chucking means for releasably mounting a printing cylinder for rotation on a third axis being mounted on said sub-frame, means for pivoting the sub-frame on said second axis to move a printing surface of the printing cylinder into printing engagement with a web extending between said printing cylinder and impression roll, means mounted on said sub frame for applying printing ink to said printing cylinder, means including a plurality of rollers mounted in the main frame for receiving a web entering the press, guiding the web to pass between the impression roll and printing cylinder and for guiding the web out of the press, means mounted on the sub-frame for rotating said chucking means and printing cylinder on the third axis, and means mounted on one of the side frame members for pivotable movement from a position beneath a printing cylinder to a position outside of said frame, said means including an arm supporting an ink pan beneath said cylinder, means raising and lowering said arm so that the ink pan engages said cylinder when the cylinder is released by said chucking means so that the pan and cylinder can be removed from the press simultaneously.
Dependencies are inferred from the claim text.