Rotary ring winding device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 30, 1991
Issued Date -
N/A
app pub date -
Apr 16, 1990
filing date -
Sep 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an improved rotary ring winding device wherein a rotary ring member is rotatably supported by a bearing device secured to a ring rail, the bearing device is provided with a first annular magnetic member wherein an annular recess is formed. The rotary ring member is provided with a second annular magnetic member having an annular projected portion which is arranged in the annular recess of the first annular magnetic member with an air-gap therebetween. The first annular magnetic member is provided with at least an annular portion formed by an electric magnet, and the other portion of the first annular magnetic member and the second annular portion are formed by permanent magnets, wherein each annular portion of the first magnetic member and each annular portion of the second magnetic member, facing each other, are designed to have identical magnetic poles. Thus controlling the exciting current applied to the electric magnet, the rotary ring member can be rotatably supported in free condition by the bearing device, and a braking force can be applied on the free rotation of the rotary ring member by controlling the above-mentioned exciting current.
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