Key coupling device for high-speed rotary dobbies
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Jul 3, 1991
filing date -
Jul 11, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control device for rotary dobbies in which a key has a transverse groove of width equal to the thickness of a control ring with which it cooperates plus the length of travel undergone by the key in its insertion into or withdrawal from radial grooves in a big end of a main crank arm or in a drive shaft. The control ring has an elliptical shape and is fixed onto a operating lever which, pivoted on a minor axis of an ellipse and retained in its rest position by a V-shaped spring, is made to rock to one side or the other about the axis of symmetry of the spring by a pusher rod. The pusher arm is operated by a cam mechanism and moved by a needle selector controlled by a programmer, to act on one of two valleys provided in a rocking sector on an operating lever symmetrically about an axis of symmetry.
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