Variable-diameter cylindrically-shaped body
AssigneeHeidelberger Druckmaschinen AG
InventorsStephen Franklin, Robert Richard Murray
Life of this patent
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Abstract
A variable-diameter cylindrically-shaped body includes a plurality of first tapered elements and a plurality of second tapered elements interacting with the first tapered elements and movable axially with respect to the first tapered elements. The first and second tapered elements define an outer surface of the body, with the outer surface having an effective diameter variable as a function of axial movement between the first and second tapered elements. The body has particular applicability in printing presses.
Claims24
A printing device comprising:
- a first variable-diameter cylindrical rotating body comprising a plurality of first tapered elements;
- and a plurality of second tapered elements interacting with the first tapered elements and movable axially with respect to the first tapered elements, the first and second tapered elements defining an outer surface of the body, the outer surface having an effective diameter variable as a function of axial movement between the first and second tapered elements;
- and
- a second rotating body forming a nip with the first rotating body, a first motor for driving the first rotating body, a second motor for driving the second rotating body, and a torque controller for distributing torque between the first and second motors as a function of an effective diameter of the first rotating body.
A method for altering an effective diameter of a cylindrically-shaped body comprising the steps of:
- varying an effective diameter of the body by moving a plurality of first tapered elements axially between interacting second tapered elements, the first and second tapered elements defining an outer surface of the body;
- and
- controlling at least one of microslip in a nip, a speed of a web, a first tension in a span between two nips, a second tension in an out-feed and a third tension in an infeed as a function of the varying step.
A method for altering an effective diameter of a cylindrically-shaped body comprising the steps of:
- varying an effective diameter of the body by moving a plurality of first tapered elements axially between interacting second tapered elements, the first and second tapered elements defining an outer surface of the body;
- and at least one of changing a signature cut-off in a folder and altering a path length of a folding cylinder as a function of the varying step.
A method for altering an effective diameter of a cylindrically-shaped body in a printing press comprising the steps of:
- varying an effective diameter of the body by moving a plurality of first tapered elements axially between interacting second tapered elements, the first and second tapered elements defining an outer surface of the body;
- and
- laterally registering the body by laterally moving both the first and second tapered elements in a same direction.
A method for altering an effective diameter of a cylindrically-shaped body in a printing press comprising the steps of:
- varying an effective diameter of the body by moving a plurality of first tapered elements axially between interacting second tapered elements, the first and second tapered elements defining an outer surface of the body;
- and
- securing a printing blanket to the body by expanding the effective diameter of the body to contact the printing blanket.
A method for altering an effective diameter of a rotating cylindrically-shaped body in a printing press comprising the steps of:
- varying an effective diameter of the body by moving a plurality of first tapered elements axially between interacting second tapered elements, the first and second tapered elements defining an outer surface of the body;
- and
- securing a printing form to the body by expanding the effective diameter of the body to contact the printing form.
Dependencies are inferred from the claim text.