US PATENT SUBCLASS 28 / 227
.~.~.~.~ By electronic or pneumatic detection of knot or slub

Current as of: June, 1999
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28 /   HD   TEXTILES: MANUFACTURING

217  DF  THREAD FINISHING {4}
219  DF  .~ Surface modification of running length {5}
222  DF  .~.~ Clearing {4}
226  DF  .~.~.~ Clamping, severing or shearing {5}
227.~.~.~.~ By electronic or pneumatic detection of knot or slub

DEFINITION

Classification: 28/227

(under subclass 226) Method or apparatus wherein sensing of the presence of the abrupt enlargement or thickened portion creates or alters fluid or electric current flow to energize or initiate a thread parting or separating operation.

SEE OR SEARCH CLASS

73, Measuring and Testing,

37.7, for checking dimensions, shape or size of a moving sheet, cable or filament or the spacing of selected portions thereof, having at least one unit for the direct application of fluid pressure thereto and utilizing the escape of fluid about the specimen as an index of its dimension, shape, size or spacing and subclasses 159+ for testing or inspecting of filaments or strands for defects, etc., other than mere inspection or visual examination.

83, Cutting,

365, for a cutting operation controlled by photoelectric detector means responsive to the work.

250, Radiant Energy, 559.4+, for a circuit responsive to a photocell and wherein the photocell is arranged relative to the material so that circuit provides an output indicative of flaws in the form of voids, holes, discoloration, and the like, and for a photocell and additional pre-photocell structure positioned to detect imperfections.

324, Electricity: Measuring and Testing,

600+, for determining impedance, admittance and related quantities of material, inclusive of strands.

340, Communications: Electrical, indicating

675+, for an electrical condition responsive system automatically responsive to the feeding of a web, sheet, or work, inclusive of a strand or thread.

356, Optics: Measuring and Testing,

430+, for optically measuring or testing a moving web or thread for flaws or imperfections, and subclass 238.1 for optical inspection of cloth or thread for flaws or imperfections.