Intermittent motion rotary printing press
OwnerDonald E. Yoder, Jr.inventor
Life of this patent
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Abstract
An intermittent motion rotary printing press in which the inking cylinder and pressure cylinder are mounted in spaced apart relation on a single common bracket assembly which pivots between an inking step position and a print step position. The range of bracket assembly pivot motion is adjustable to define a first stop point at which the inking cylinder transfers ink to a printing plate and a second stop point at which the pressure cylinder confines a web in printing contact with the printing plate. One or more pneumatic cylinders operate to shift the bracket assembly between first and second stop points and hold the assembly at the selected stop point for inking or printing operations respectively.
Claims4
An intermittent motion rotary printing press for printing on one side successive definite lengths of a continuous flexible web advanced through the press from a source of supply upstream of the press, the web having a print-receiving side and a non-printed side, in a process wherein motion of the web is stopped after each of said successive lengths has been printed and is resumed when the following successive length is to be printed, said press being of the type comprising an inking cylinder, a print cylinder having a printing plate attached to and covering a portion of its surface, and a pressure cylinder, all of which cylinders are mounted for rotation with their axes substantially parallel and horizontally positioned, wherein the improvement comprises:
- a. a bracket assembly on which both the pressure cylinder and inking cylinder are rotatably mounted in spaced apart relation, said bracket assembly being mounted for pivoting movement about a horizontal pivot axis between a first stop point at which the inking cylinder makes ink transferring contact with the printing plate and the pressure cylinder is spaced from the print cylinder, and a second stop point at which the inking cylinder is spaced from the print cylinder and the pressure cylinder confines the web in printing contact with the printing plate;
- b. adjusting means for independently varying the location of the first and second stop points;
- and
- c. means for moving the bracket assembly between the first and second stop points and for holding the assembly at the first stop point during an inking step in which the print cylinder and inking cylinder rotate at equal surface speeds in directions opposite one another and ink is applied to the printing plate from the inking cylinder, and at the second stop point during a printing step in which one of said successive definite lengths of the web is advanced at a predetermined speed and is printed by the inked printing plate as the print cylinder rotates at a surface speed equal to the predetermined web speed.
Dependencies are inferred from the claim text.