Method and apparatus for damping bending vibrations of cylinders in a printing press
AssigneesHeidelberger Druckmaschinen AG, Heidelberg Harris, Inc.
InventorJilani Chrigui
Life of this patent
Estimating the term…
Abstract
A method and apparatus for damping bending vibration in a group of cylinders in a printing press is provided. In accordance with the method, the frequencies of the fundamental vibration modes are initially determined and then dynamic dampers are disposed so as to damp the vibrations. In accordance with the apparatus, at least one dynamic damper is disposed inside the envelope of a cylinder in the group of cylinders. It may be formed as a mass held elastically inside the envelope and having a vibration frequency that corresponds to the frequency of a fundamental vibration mode of the group of cylinders.
Claims15
A method for damping bending vibrations in a group of cylinders situated in a print assembly of a printing press, the method comprising the steps of:
- determining a frequency of at least one fundamental vibration mode;
- and
- disposing at least one dynamic damper such that said dynamic damper damps said frequency of the fundamental mode of said group of cylinders.
A method for damping bending vibrations in a group of cylinders situated in a print assembly of a printing press, the method comprising the steps of:
- determining a frequency of at least one fundamental vibration mode, the at least one fundamental vibration mode being defined as a mode in which an upper blanket-carrier cylinder and an upper plate-carrier cylinder of an upper print assembly are in phase opposition relative to a lower blanket-carrier cylinder and a lower plate-carrier cylinder of a lower print assembly;
- and
- disposing at least one dynamic damper such that said dynamic damper damps said frequency of the fundamental mode of said group of cylinders.
A method for damping bending vibrations in a group of cylinders situated in a print assembly of a printing press, the method comprising the steps of:
- determining a frequency of at least one fundamental vibration mode, the at least one fundamental vibration mode being defined as a mode in which an upper blanket-carrier cylinder and a upper plate-carrier cylinder of an upper print assembly are in phase opposition to each other and a lower blanket-carrier cylinder and a lower plate-carrier cylinder of a lower print assembly are in phase opposition to each other;
- and,
- disposing at least one dynamic damper such that said dynamic damper damps said frequency of the fundamental mode of said group of cylinders.
A method for damping bending vibrations in a group of cylinders situated in a print assembly of a printing press, the method comprising the steps of:
- defining a first fundamental vibration mode as a mode in which an upper blanket-carrier cylinder and an upper plate-carrier cylinder of an upper print assembly are in phase opposition relative to a lower blanket-carrier cylinder and a lower plate-carrier cylinder of a lower print assembly;
- defining a second fundamental vibration mode as a mode in which the upper blanket-carrier cylinder and the lower plate-carrier cylinder of the upper print assembly are in phase opposition to each other and the lower blanket-carrier cylinder and the lower plate-carrier cylinder of the lower print assembly are in phase opposition to each other;
- determining a first frequency of the first fundamental vibration mode, and a second frequency of the second fundamental vibration mode;
- and
- disposing a first dynamic damper inside the upper plate-carrier cylinder and inside the lower plate-carrier cylinder, the first dynamic dampers having the same natural frequency as the first fundamental vibration mode;
- disposing a second dynamic damper inside the upper blanket-carrier cylinder and inside the lower blanket-carrier cylinder, the second dynamic dampers having the same natural frequency as the second fundamental vibration mode.
An apparatus for damping bending vibration in a group of cylinders situated in a print assembly of a printing press, comprising:
- at least one dynamic damper having a mass-forming element elastically disposed inside one of the cylinders, said mass-forming element having a vibration frequency corresponding to a frequency of a fundamental vibration mode of the group of cylinders.
Dependencies are inferred from the claim text.