Winding – tensioning – or guiding – Tension control or brake – Supply controlled
Reexamination Certificate
2006-03-28
2006-03-28
Matecki, Kathy (Department: 3654)
Winding, tensioning, or guiding
Tension control or brake
Supply controlled
C242S419300, C242S156100, C242S156200
Reexamination Certificate
active
07017849
ABSTRACT:
An idler roll brake in a paper handing machine employs an electromagnet positioned close to the periphery all of the idler roll which interacts with and induces eddy currents a conducive roll and a gear shaped steel ring fitted within the conducive roll. The electromagnet is arranged transverse to the axis of the roll and has three poles. The gear-shaped steel ring forms opposite poles which are attracted to the poles of the electromagnet which bring the roll to complete stop. An alternative embodiment roll brake employs a brake shoe mounted to the roll end bearing. The brake shoe slides forward to bring the brake shoe against the interior surface of the roll. An electromagnet positioned beneath the roll attracts a ferromagnetic armature or permanent magnet mounted to the brake to pull the brake shoe into engagement with the inner surface of the roll.
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Torspec™ Eddy Current Brakes, company pamphlet.
Scott B. Hughes, “Magnetic braking: Finding the effective length over which the eddy currents form”, Physics Department, The College of Wooster, Wooster, Ohio 44691, May 5, 2000.
Daul Michael J.
Fuchs Lawrence J.
Kim Sang
Matecki Kathy
Metso Paper Inc.
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