Electromagnetic clutch-brake for industrial sewing machine
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United States of America Patent
Stats
-
Nov 5, 1985
Grant Date -
N/A
app pub date -
Oct 12, 1982
filing date -
Oct 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a clutch-and-brake unit for use with a continuously rotating, motor-driven shaft, for example in an industrial sewing machine, a single disk has a clutch surface on one side and a brake surface on the other side. The disk is magnetically urged into operative engagement with clutch and brake pressure plates facing the respective clutch and brake surfaces of the disk, the clutch pressure plate being rotated by the motor-driven shaft to rotate the disk and a shaft connected thereto when operatively engaged, and the brake pressure plate being non-rotatable to brake the shaft. The brake pressure plate is also constantly urged into light contact with the brake surface sufficient to brake the disk and shaft only when the disk is not operatively engaged with the clutch pressure plate. This prevents the disk and connected shaft from rotating when neither the clutch nor the brake are operatively engaged and eliminates engagement noise when the brake pressure plate is operatively engaged.
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