Perf/score shell for presses
AssigneeEnvironmental Specialties Inc.
InventorsMichael T. Miske, Billy D. Hatcher
Life of this patent
Estimating the term…
Abstract
A shell featuring a main body formed of a hard and flexible sheet-like substance, such as stainless steel, is substituted for the rubber blanket of a blanket cylinder in a lithograph offset press. Perforating material that includes spaced teeth with flat edges are mounted on the impression cylinder and engage the main body of the shell to form perforations without shoulder defects. Slitting or scoring may also be accomplished by the arrangement. Stabilizing strips are positioned upon the main body of the shell in sheet-fed press applications. Flexible rubber sheets are mounted to the ends of the main body. Blanket bars are also mounted to the flexible rubber sheets. The blanket bars engage the lock-up of the blanket cylinder to secure the shell in position.
Claims11
A system for perforating, scoring or slitting a substrate passing between a first cylinder and a second cylinder in a press comprising:
- a. a shell wrapped about a first cylinder of the press, said shell including a main body constructed of a hard and flexible sheet-like substance and means for securing the main body to the first cylinder;
- and
- b. a material including a flat edge attached to the second cylinder, said flat edge lightly contacting the main body of said shell as the substrate passes between the first and second cylinders so as not to deform the main body and so that a perforation, score or slit is formed in the substrate.
A system for perforating, scoring or slitting a substrate passing between a first cylinder and a second cylinder in a press comprising:
- a. a shell wrapped about a first cylinder of the press, said shell including a main body constructed of a hard and flexible sheet-like substance and means for securing the main body to the first cylinder;
- b. a material including a flat edge attached to the second cylinder, said flat edge engaging a portion of a surface of the main body of said shell as the substrate passes between the first and second cylinders so that a perforation, score or slit is formed in the substrate;
- and
- c. a plurality of friction-enhancing stability strips attached to the surface of the main body adjacent to the portion of the main body surface that is engaged by the flat edge of the material attached to the second cylinder, said stability strips facing radially away from the first cylinder when said shell is attached thereto so as to gently hold the substrate in place as the perforation, score or slit is formed therein.
A system for perforating, scoring or slitting a substrate passing between a first cylinder and a second cylinder in a press comprising:
- a. a shell wrapped about a first cylinder of the press, said shell including a main body constructed of a hard and flexible sheet-like substance and means for securing the main body to the first cylinder;
- and
- b. a material including a flat edge attached to the second cylinder, said flat edge kissing the main body of said shell as the substrate passes between the first and second cylinders so that a perforation, score or slit is formed in the substrate.
Dependencies are inferred from the claim text.