US PATENT SUBCLASS 57 / 332
.~ False twist device

Current as of: June, 1999
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57 /   HD   TEXTILES: SPINNING, TWISTING, AND TWINING

1 R  DF  APPARATUS AND PROCESSES {45}
332.~ False twist device {4}
333  DF  .~.~> Having fluid jet twisting means
334  DF  .~.~> Friction type {4}
344  DF  .~.~> Having a tube, or a twisting head therefor, through which yarn passes, with a yarn gripper {2}
348  DF  .~.~> Including mounting, support, or housing {1}

DEFINITION

Classification: 57/332

False twist device:

(under subclass 1) Apparatus which produces a twist of filaments or fibers in one portion of a strand that is equal, and of opposite hand, to that simultaneously produced in an adjacent portion of the strand.

(1) Note. Since the algebraic sum of the twistings in the strand effected by machines of this subclass is zero, the operation is frequently termed a "false twist".

(2) Note. Machines of this subclass usually comprise devices which rotate a portion of a strand about its axis, intermediate its ends, without rotation of either end of the strand relative to the other, to produce opposite twists in the strand.

(3) Note. The devices of this subclass include electrostatic charging means, devices supported by the yarn being twisted, and twist devices which are an extension of an electric motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

318, for false twist devices combined with means to produce a variable drafting effect.

328+, for false twist devices combined with drafting mechanism. SEE OR SEARCH CLASS

118, Coating Apparatus,

44, for false twist devices combined with means to coat a strand (yarn, roving, sliver, etc.) while it is under the influence of the false twister.