US3267657A

US3267657A - False twisting device

Info

Publication number: US3267657A
Application number: US850908A
Authority: US
Inventors: Kunzle August; Roth Willy
Original assignee: Heberlein Patent Corp
Current assignee: Heberlein Patent Corp
Priority date: 1958-11-11
Filing date: 1959-11-04
Publication date: 1966-08-23
Anticipated expiration: 1983-08-23
Also published as: DE1410406A1; BE584320A; CH367271A; DE1835498U; ES252739A1

Description

Aug. 23, 1966 A. KUNZLE ETAL FALSE TWISTING DEVICE 5 Sheets-Sheet 1 Filed Nov. 4, 1959 IN V EN TORS. flucus rffi/NzL E. BY VV/L 4 rPo rH.

Aug. 23, 1966 A. KUNZLE ETAL FALSE TWIS'IING DEVICE f m w m m m W w WW A a 5L Q, m um um W 0% Filed Nov,

United States Patent 3,267,657 FALSE TWISTING DEVICE August Kuuzle and Willy Roth, Wattwil, Switzerland, assignors to Heberlein Patent Corporation, New. York, N.Y., a corporation of New York Filed Nov. 4, 1959, Ser. No. 850,908 Claims priority, application Switzerland, Nov. 11, 1958, 66,023/58 6 Claims. (Cl. 57--77.45)

This invention relates to a device for imparting a twist to a running length of textile yarn, and more particularly to apparatus for false twisting such yarns.

Early apparatus for false twisting textile yarns was hindered by the fact that the speed of rotation which could be imparted to the twisting means was seriously limited. In recently developed devices there has been a tendency to increase the rate of rotation of the twister head quite considerably, for example up to about 200,000 rpm. and even more. At these high speeds it is possible to greatly increase yarn feeding speed and to thereby very significantly increase the rate of production of crimped yarn.

In one popular apparatus which imparts a very high rotational speed to the twister head, the twisting tube is supported on freely rotatable axially parallel rollers and is in tangential contact with these rollers. Rotation is imparted to the twisting tube directly by means of a high speed driving belt in contact therewith which also presses the tube against the rollers. Because of the relatively small diameter of the twisting tube or any built up spindle portion thereof, such apparatus requires the use of a very high speed driving belt in order to impart the aforementioned high rotational speeds. In such apparatus the false twisting tube and rollers must be adapted to prevent axial displacement of the tube in the direction of yarn travel over the twister head. Since the twisting tube is held in against the rollers by belt pressure, access to the tube is possible only if the entire apparatus is lifted off or otherwise completely disengaged from the driving belt. It is an object of the present invention to provide a false twisting device which overcomes these salient drawbacks of currently available devices.

It is a further object to provide an apparatus wherein rotational speeds of 200,000 rpm. and more are indirectly imparted to the false twisting tube, and in which the twisting tube is easily accessible and removable.

The false twisting device of the present invention comprises a pair of spaced rollers, a twisting tube in tangential frictional contact with each of said rollers and magnetic means acting upon the twisting tube to maintain the same in contact with said rollers. The rollers are so spaced as to provide a crotch or throat therebetween and one of the rollers is driven, and the other is an idler. Rotation is imparted to the twisting tube as a result of its frictional contact with the driven roller, and the tube in turn imparts rotation to the other roller which is simply an idler. Frictional contact between the twisting tube and the driven and idler rollers is maintained through the force of either an electromagnet or a permanent magnet acting upon said twisting tube and holding the same in the crotch or throat between the rollers.

For a further and complete description of our novel false twisting device, reference will now be made to the drawings wherein:

FIG. 1 is a partially broken away inverted plan view of one embodiment of a false twisting device in accordance with the present invention;

FIG. 2 is a sectional elevation taken on the line AA of FIG. 1;

ice

FIG. 3 is a side elevation of the apparatus of FIG. 2 in the direction of the arrow B;

FIG. 4 is an enlarged sectional elevation on the line C-C of FIG. 1, but with the magnet rotated from its correct position in FIG. 1 for illustrative purposes only;

FIG. 5 is an enlarged sectional elevation similar to FIG. 4 but illustrating a modified twisting tube and magnet end;

FIG. 6 is an elevation of another embodiment of the apparatus of the present invention, and FIG. 7 is a plan view of the apparatus of FIG. 6.

Referring now to FIGS. 1-4, the carrier plate 11 is provided with an opening 34 to accommodate a driving shaft, for example the shaft 5 of a motor, only a portion of the mounting 34a being shown. The shaft 5 is joined to a driven shaft 35 upon which is mounted a driven roller, which comprises a huh I secured to shaft 35 as by means of a set screw 25, and a pair of spaced circular flanges or discs 3, 3'. In the embodiment illustrated discs are employed and they are maintained in a predetermined spaced relationship by means of a spacer sleeve or bushing 2.

A hearing shaft 10 is mounted on the carrier plate 11, by means of a nut 27 on its lower threaded end 26. Shaft 10 supports the idler roller which comprises a pair of circular flanges or discs 6, 6', mounted on a hub 9 which, by reason of bearing 8, 8, is freely rotatable. Discs 6, 6' are spaced a predetermined distance apart by a bushing 7.

In this embodiment the

opposed discs

3, 6 and 3', 6' are in staggered overlapping relationship, the discs being so spaced on the rollers that the peripheral edge portions of

discs

3, 3 protrude between discs 6, 6'. While the discs of the driven roller are spaced closer to one another than discs 6, 6' of the idler roller, it is of course within the scope of the present invention to provide the driven roller with the outside pair of discs. Also the overlapping relationship might be obtained with rollers having equally spaced discs simply by raising one of the rollers.

The rollers are spaced to form a crotch 40, comprising an upper portion provided between overlapping

discs

3 and 6 and a lower portion provided between overlapping discs 3 and 6', and a twisting tube 4 is positioned in crotch 40 in frictional engagement with the peripheral edges of

discs

3, 3' and 6, 6'. A forked tip 20 which comprises the twister head is mounted on the upper end of twisting tube 4. A pin 17 of a hard material, eg sapphire, is disposed normally of the axis of rotation of the twisting tube bridging the gap of the fork. Intermediate its points of contact with the peripheral edges of

discs

3, 3' and 6,6, twisting tube 4 is provided with a mass of high permeability, low-loss magnetic material illustrated in FIG. 2 as a central cylinder 12.

Magnetic means, for example a bar magnet 13, are centrally disposed between

discs

3, 3' and 6, 6 with the face of its pole piece or pieces substantially parallel to the axis of twisting tube 4 and in close proximity to the surface of cylinder 12 of low-loss magnetic material. In the embodiment of FIGS. 1-4, the distance between the pole face 28 and cylinder 12 is about 0.3 mm. Under the influence of magnet 13 the twisting tube 4 is held uniformly in crotch 40 and against the peripheral edges of driven

discs

3, 3 and idler discs 6, 6'. The idler roller is caused to rotate by the driven discs via the twist tube 4. Rotational direction is indicated by the arrows in FIG. 1.

As seen in FIGS. 1 and 3, bar magnet 13 rests in the groove of a two part bearing clamp 14, 14a which is provided with

clamping screws

16 and 29, the latter passing through carrier plate 11. For adjustment of the magnet eems? 13 with respect to the twisting tube 4, there is provided a screw 34) mounted in an adjusting ring 31 seated on the magnet and clamped thereto by means of the screw 32. When the screws 16 in the upper part 14a of the bearing clamp are loosened, longitudinal displacement of the magnet is effected simply by turning adjusting screw 39.

Rotation may be imparted to shaft 35 of the driven roller by any suitable means, for example a medium frequency electric motor, the shaft of which is suitably connected to shaft 35, or by means of a driving belt or plurality of belts. The belt drive is preferred since a plurality of false twisting devices can be simultaneously driven from the same moving belt. Where a belt drive is employed, means, not shown, are preferably provided for engaging and disengaging the lower extension of shaft 35 and the moving belt.

The apparatus of the present invention is operated simply by feeding the yarn 19 to be false twisted from a supply, not shown, through aperture 18 in the carrier plate 11, if the roller discs are not of sufficient diameter to extend beyond the edge of the carrier plate, then through the twisting tube 4 and looping it around pin 17 as is usual in false twisting apparatus of this kind, and ultimately to a take-up device, not shown.

Referring now to FIG. 4, the cylinder 12 of low-loss magnetic material is preferably a sleeve made up of a series of hollow discs of a high permeability low-loss magnetic material such as sheet iron arranged adjacent one another as is usual in the construction of transformers. Preferably discs 21, 21' of non-magnetic material, e.g. brass or stainless steel, are disposed at the respective ends of the series of discs of magnetic material. By reason of the low-loss magnetic material and the position of the magnet closely adjacent thereto axial displacement of the twisting tube is magnetically inhibited.

The embodiment of FIG. 5 is specifically designed to magnetically prevent displacement and to quickly restore the twisting tube to its proper position should axial displacement occur. The face of magnet 13 is provided with teeth 24 and the sleeve on the twisting tube 4 consists of alternate discs of low-loss sheet iron 22 disposed opposite magnet teeth 24 and discs 23 of non-magnetic material positioned between said teeth.

Another embodiment of the false twisting device of the present invention is illustrated in FIGS. 6 and 7, wherein it :will be seen that the driven and idler rollers are identical and mounted in the same way upon the carrier plate 11. Both rollers are freely rotatable on bearings which are not shown, and the shaft of either roller may be driven. In the apparatus illustrated, shaft 35 is provided with a friction collar 52 which engages a moving belt 53 when the apparatus is in operating position. The carrier plate 11 is provided with a handle 54 and locking means, not shown, and is drilled and slidably mounted on a pair of guides 11a and 11b. Collar 52 is disengaged from moving belt 53 simply by disengaging the locking means and pulling on handle 5%. Obviously other means might be provided for engaging and disengaging the device, for example, carrier plate 11 m ght be pivotally mounted on the machine base.

It will be observed that in this embodiment of the device the circular flanges or

discs

3, 3 and 6, 6 of the driven and idler rollers, respectively, are in aligned relationship, as distinguished from the staggered arrangement of the device of FIGS. l-3. Furthermore, each of the flanges is provided with a rim or tire 50, 5t) and 51, 51' of a wear resistant, resilient, friction material to reduce slippage between the discs and twisting tube to a minimum. The rim material is preferably a modified natural or synthetic rubber. While the rims or tires are not essential to the apparatus of the present invention it has been found that the modified rubber rim not only minimizes wear on the metal twisting tube, but also provides the best frictional contact therewith. When rims are employed, the flanges or discs of the respective rollers d may be metal. If the discs are not provided with wear resistant, resilient rims as in the apparatus of FIGS. l-3, at least the edge of the disc which comes in contact with twisting tube 4- is constructed of a hard, resilient material, for example a polyarnide or phenoplast synthetic resin. Desirably the entire disc is constructed of such material.

In the embodiment of FIGS. 6 and 7 the twisting tube 4- is provided with an enlarged central cylindrical portion l2aand the cyl'nder 12 of magnetic material consists of the aforementioned discs of sheet iron or other high permeability, lowloss magnetic material, firmly adhered over portion 12a.

In this embodiment the rollers are spaced to form a crotch or throat 41, comprising an upper portion provided between

discs

3 and 6 and a lower portion provided between

discs

3 and 6. The magnetic means employed to maintain the twisting tube in throat 41 in frictional contact with the peripheral edges of the rims Stl, 50 and 51, 51' is a permanent horseshoe magnet 15, which is supported on the carrier plate 11 by means not shown. The pole pieces 15a and 15b of the magnet extend into the space between the aligned roller discs, and the face of each pole piece is shaped as indicated in FIG. 7 to closely accommodate cylinder 12 on the twisting tube.

Twisting tube speeds up to 250,000 rpm. and more have been achieved and satisfactorily maintained for several months with the devices illustrated. At these speeds the hub l of th apparatus of FIGS. 1-3 and the collar 52 and its shaft 35 of FIGS. 6 and 7 rotate at speeds of only about 20,000 rpm. The ratio of tube speed to disc speed is desirably between about 10 and 30:1.

While we have hown and described at least two embodiments of our improved yarn twisting device, we do not wish to be limited to the specific details of construction disclosed, it being understood that changes may be made therein within the range of engineering skill without departing from the spirit of the invention.

We claim:

1. Apparatus for false twisting textile yarns comprising a pair of rollers, at least one of which is driven, spaced one from the other to form a crotch therebetween, a yarn twisting tube positioned in said crotch in frictional engagement with the peripheral edges of said rollers at portions substantially spaced longitudinally Otf said tube and having means for imparting a twist to yarn passing therethrough upon rotation of said tube, and separate magnetic means located substantially equidistant from the axes of said rollers and acting on said tube between said spaced portions to maintain the tube positioned in said crotch and in said friction engagement, the portions of said tube in frictional engagement with the edges of said rollers haying diameters substantially smaller than those of the rollers taken at the corresponding peripheral edges.

2. Apparatus for false twisting textile yarns comprising a pair of rollers, at least one of which is driven, spaced one from the other to form a crotch therebetween, a yarn twisting tube positioned in said crotch in frictional engagement with the peripheral edges of said rollers at portions substantially spaced longitudinally of said tube and having means for imparting a twist to yarn passing therethrough upon rotation of said tube, and separate magnetic means located substantially equidistant from the axes of said rollers and acting on said tube between said spaced portions to maintain the tube positioned in said crotch and in said friction engagement, the portions of said tube in frictional engagement wit-h the edges of said rollers having diameters of the order of between about 10 and 30 times smaller than those of the rollers taken at the corresponding peripheral edges.

3. Apparatus for false twisting textile yarns comprising a pair of rollers, at least one of which is driven, said rollers being spaced one from the other to form a crotch there'between, a yarn twisting tube positioned in said crotch in frictional engagement with the peripheral edges, of said rollers at portions substantially spaced longitudi nally of said tube and having means for imparting a twist to yarn passing therethrough upon rotation of said tube, at least one Olf said rollers including a pair of spaced flanges forming the peripheral edges thereof, and separate magnetic means located substantially equidistant from the axes of said rollers and between said flanges and acting on said tube between said spaced portions to maintain the tube positioned in said crotch and in said frictional engagement, the portions of said tube in frictional engagement with the edges of said rollers having diameters substantially smaller than those of the rollers taken at the corresponding peripheral edges.

4. Apparatus for false twisting textile yarns comprising a pair of rollers each formed with a pair of spaced flange pairs disposed in opposed staggered relation and at least one of which rollers is driven, said pairs of flanges spaced one from the other to form a crotch therebetween, a yarn twisting tube positioned in said crotch in frictional engagement with the peripheral edges of said flanges at portions substantially spaced longitudinally off said tube and having means for imparting a twist to yarn passing therethrough upon rotation of said tube, and separate magnetic means located substantially equidistant from the axes of said rollers and between said flanges and acting on said tube between said spaced portions to maintain the tube positioned in each crotch and in said frictional engagement, the portions of said tube in frictional engagement with the edges of said flanges having diameters substantially smaller than those of the flanges taken at the corresponding peripheral edges thereof.

5. Apparatus for false twisting textile yarns compris ing a pair of rollers each formed with a pair Olf spaced flange pairs disposed in opposed aligned relation and at least one of which rollers is driven, said pairs of flanges spaced one from the other to form a crotch therebetween, a yarn twisting tube positioned in said crotch in frictional engagement with the peripheral edges of said flanges at portions substantially spaced longitudinally of said tube and having means for imparting a twistto yarn passing therethrough upon rotation of said tube, and separate magnetic means located substantially equidistant from the axes of said rollers and between said flanges and acting on said tube between said spaced portions to maintain the tube positioned in said crotch and in said frictional engagernent, the portions 0t said tube in frictional engagement with the edges of said flanges having diameters substantially smaller than those of the flanges taken at the corresponding peripheral edges thereof.

6. Apparatus for false twisting textile yarns comprising a pair orf rollers, at least one or which is driven, spaced one from the other to form a crotch therebetween, a yarn twisting tube positioned in said crotch in frictional engagement with the peripheral edges of said rollers at portions substantially spaced longitudinally of said tube and ha ving means for imparting a twist to yarn passing therethrough upon rotation oif said tube, said twisting tube intermediate its points otf engagement with said peripheral edges being provided with a mass orf low loss magnetic material and a separate magnet having at least one pole located substantially equidistant from the axes Otf said rollers and acting on said tube between said spaced portions to main tain the tube positioned in said crotch and in said frictional engagement, the portions of said tube in fractional engagement with the edges of said rollers having diameters substantially smaller than those of the rollers taken at the corresponding peripheral edges.

References Cited by the Examiner UNITED STATES PATENTS 687,428 11/1901 Heinze 74-210 2,227,910 1/1941 Pool 57--5l 2,557,104 6/ 19 51 Hegedus 5777.'33 2,855,750 10/1958 Schrenk et al 57-77.45

FOREIGN PATENTS 32-10379 12/ 1957 Japan.

STANLEY N. G-ILREATH, Primary Examiner.

RUSSELL C. MADER, Examiner.

J. PETRAKE'S, Assistant Examiner.

Claims

1. APPARATUS FOR FALSE TWISTING TEXTILE YARNS COMPRISING A PAIR OF ROLLERS, AT LEAST ONE OF WHICH IS DRIVEN, SPACED ONE FROM THE OTHER TO FORM A CROTCH THEREBETWEEN, A YARN TWISTING TUBE POSITIONED IN SAID CROTCH IN FRICTIONAL ENGAGEMENT WITH THE PERIPHERAL EDGES OF SAID ROLLERS AT PORTIONS SUBSTANTIALLY SPACED LONGITUDINALLY OF SAID TUBE AND HAVING MEANS FOR IMPARTING A TWIST TO YARN PASSING THERETHROUGH UPON ROTATION OF SAID TUBE, AND SEPARATE MAGNETIC MEANS LOCATED SUBSTANTIALLY EQUIDISTANT FROM THE AXES OF SAID ROLLERS AND ACTING ON SAID TUBE BETWEEN SAID SPACED PORTIONS TO MAINTAIN THE TUBE POSITIONED IN SAID CROTCH AND IN SAID FRICTION ENGAGEMENT, THE PORTIONS OF SAID TUBE IN FRICTIONAL ENGAGEMENT WITH THE EDGES OF SAID ROLLERS HAVING DIAMETERS SUBSTANTIALLY SMALLER THAN THOSE OF THE ROLLERS TAKEN AT THE CORRESPONDING PERIPHERAL EDGES.