US2233645A - Textile twisting unit - Google Patents

Description

March 4, 1941. G. sMiTH TEXTLE TWISTING UNIT INVENTOR @awa/dwz Shi/ ',9

Filed June 17, 1940 Patented Mar. 4, 194i UNITED STATES PATENT OFFICE e 2,233,645 f TEXTILE TwIsTING UNIT Connecticut Application June 17, 1940, serIaI No. 340,932

Claims.

An object of the present invention is tov provide a simple and eillcient double twisting unit in which the material being twisted is maintained -against rotating with the revolving yarn guide by magnets provided with damping coils, these magnets being on the mounting means for the package and being attracted toward pole pieces mounting means, the gap between the pole faces of the magnets and their pole pieces on the fixed mmberjbeing annular and providing limited but suillcient space for a yarn guide to revolve at high speed within the gap.

Another object of the invention is to provide ltensioning means for the material being twisted and including guiding means for the material in the revolving twisting member, ,there being a light spring pressing a thin disc against a portion of the revolving member for the material being twisted as it advances from the package to the revolving twisting disc and its guide to provide a light tension on the material.

And finally it is an 'object of the invention to prevent oscillation or hunting of the package supporting member during operation by providing damping means in the form of damping poles on the end faces of the magnets by slotting these faces and filling the spaces with highly conducting and preferably non-magnetic material vsuch as aluminum, brass, copper, etc., of which the package supporting member may be cast or other.- wise formed.

With the above and other objects in view the invention includes the features of construction and operation set forth in the following speciil- Fig. 1 is an elevation of a complete twisting unit made according to the present invention, parts being broken away to more clearly show their construction;

Fig. 2 is a horizontal sectional view taken on a fixed unit member surrounding the package through the supporting member for the yarn packagerand Fig. 3 is a detail view in elevation of the package supporting member showing the face of one of its magnets and the damping means thereon. In the above mentioned drawing there has been shown but one embodiment of the invention which is now deemed preferablabutit is to be understood that changes and modiflcations may be made within the scope of the appended clalms without departing from the spirit of the invention.

Briefly, and in its preferred aspect, the invention is applicable to a twister including the following principle parts: First. a fixed unit support; second, a rotatable member therein on which is mounted a thread guide; thirdfa package support on which may be mounted the material being twisted; fourth, anti-friction bearings sup-V porting this package supporting member centrally upon the rotatable member; fth, magnets on said package supporting member having their end. faces at spaced portionsof the periphery thereof and having damping coils formed therein; sixth, pole pieces on the fixed support and adjacent the end faces respectively of the magnets; seventh, a guiding conduit centrally within the package supporting member,l and eighth, a guide for the yarn being twistedon the rotatablemember at the periphery thereof and adapted to rotate within the gap between the periphery of the package supporting member and the pole pieces.

Referring more in detail to the figures of the drawing, I provide a fixed assembly supporting or body member I0. Anumber of these xed members may be mounted upon any usual form of twisting machine frame to form twisting units therein and may be retained in fixed positions by any desired means not shown. Rotatable cen- ,Y

I3 one only of which is shown. To permit rotation of the plate Il and-its associated members within the support I0 at high speeds the plate II may be secured to the upper end of a shaft I4. This shaft Il may be rotated by any means, not shown, and may preferably be mounted on antifriction bearings I5.

Mounted centrally upon the upper end of the supporting plate Il is a package or material supporting member I6. As shown in Fig. 1 the plate II has a central member I'I extending upward therefrom and provided with anti-friction bearings I8. On member I6 may be-placed a package of materialto be twisted' such as the cone I9.

Extending centrally upward from the material` supporting member I6 is a tubular member 20 around which the cone I9 is centered. I

A continuous guideway is therefore provided for the material being twisted from the package I9 through the tube 20- and the members I6 and I'I to a position below the plate lII and thence out through one of the tubular guides I3. Preferably and as shown in Fig. 1 a light tensioning plate or disc 2| is spring pressed upward against a surface of member Il so that this plate or disc applies a light drag or tension on the material being twisted as it is drawn from the twisting unit.

In order to retain the member -16 against rotation while the plate II and assembled parts are rotating at extremely high speed, magnets 22 are formed, preferablyl by casting, within the member I6 which is of non-magnetic but conducting material such as brass, aluminum, etc.

As shown in Fig. 2, two of these magnets 22 are provided each of which has its opposite pole or end face at spaced portion of the periphery of the member I6 which asshown is circular. On the xed supporting member I0 are formed pole pieces 23 there being one pole piece for each pole face of magnets 22. Preferably the pole pieces may be formed as integral parts of member I0, the magnetic material of Which this member is made being -increased at Ythese portions. These pole pieces 23 are spaced slightly from the pole faces of magnets 22 so that an annular but narrow opening is formed about which the guide I3 and the material being twisted travels during rotation of the member II. During this rotation of member II the support I6 for the 'material Vbeing twisted is retained against rotation bythe magnetic attraction of the magnetic poles to the pole pieces. v

As the guide I3 rotates at extremely -high speeds and the tension on the material may be irregular there is a-tendency for the supporting member I6 to rotate or swing-back and forth. The only force preventing this motion is the magnetic attraction between the magnet end faces and the pole pieces 23. When oscillations start effective damping means are required to effectively reducev this swinging and restore the member I6 lto lrest. Such damping meansare provided by the end faces of vthe magnets 22 being slotted vertically,l thespaces provided by these slots being iilled with a' .metal having good conductingv qualities. As stated above the member I6 may be .cast of brass, aluminum, etc., in a mould into which the magnets 22 have previously been placed. The cast material therefore forms damping coils surrounding the end projections of the magnets 22. v

Any tendency of the package supporting meniber I6 to oscillateI or swing back and forth tends to increase and decrease the air gap between the l poles and their pole pieces 23. This change in air gap will change the magnetic iiux linking the damping coils which in turn will induce currents in the coils. These induced currents absorb en- A`ergy from the motion of oscillation and thus speed and the strand of material passes 'from the package or supply I9 maintained against rotation by the means above/ described through n guide I3. From the guide I3 the strand of material being twisted passes upward'to a centrally mounted eyelet 24.1ixed to a part of the machine and thence to a suitable take-up mechanism.n With each rotation of the plate II and guide I3 By varying the -rate of advancing or feeding motion of the strand the strandreceives two twists.

from the eyelet`24 bythe take-up mechanism the number of twists per unit 'of length can be widely4 ing a central rotatably mounted member for supporting the material beingtwisted and housed centrally withinthe twisting unit, magnets within said material supporting 'member having their vpole ends at the periphery thereof, polepieces within said twisting unit, wherebysaid supportingmember is ymaintained in a predetermined rotative position, and damping coils formed at said pole ends, whereby movements of said supporting member from said position are restrained and said position restored.

3. A textile twisting unit comprising in combination, a unit member, a material supporting member mounted centrally of said unit mem-v ber, material guiding means rotatable within said unit member and revolvable relative to said material supporting member, means to guide material from said supporting member to said rotatable guiding member, and magnets having damping coils at their pole facesto aid in retaining said supply support against rotation and for preventing oscillation of said support during operation of said guiding member.

4. A double, twister unit comprising in combination, a fixed unit member, a material supporting member mounted for rotation therein but normally retained in a predetermined rotative position duringv the twisting operation, magnets within one of said members, pole pieces formed in the other member, said magnets and pole pieces cooperating to retain said supporting member against rotation, said magnets having their pole ends slotted, and damping coils extending about said slotted ends.

5. A double twister unit comprising in combination, a fixed unit member, a material supporting member of conductingv material mounted for rotation therein but normally retained in a predetermined rotative position during the twisting operation, magnets within one of said members, pole pieces formed'in the other member, said magnets'and pole pieces cooperating to retain said supporting member against rotation, said magnets having their pole ends slotted, and the conducting material of said supporting member extending around said slotted ends to form damping coils thereon.

GRAYDON SMITH.

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