US3094835A

US3094835A - Method of and a means for reducing the yarn tension on a balloon-forming twist spindle

Info

Publication number: US3094835A
Application number: US35756A
Authority: US
Inventors: Nimtz Klaus; Kresslein Albert
Original assignee: Volkmann and Co
Current assignee: Volkmann and Co
Priority date: 1959-06-20
Filing date: 1960-06-13
Publication date: 1963-06-25
Anticipated expiration: 1980-06-25
Also published as: NL252758A; NL111054C; DE1211975B; CH385686A; GB941257A

Description

June 25, 1963 K. NIMTZ ETAL METHOD OF AND A MEANS FOR REDUCING THE YARN TENSION ON A BALLOON-FORMING TWIST SPINDLE Filed June 13, 1960 5 Sheets-Sheet I June 25. 1963 K, NlMTZ ET'AL 3,094,835

METHOD OF AND A MEANS FOR REDUCING THE YARN TENSION ON A BALLOON-FORMING TWIST SPINDLE Filed June 13, 1960 3 Sheets-Sheet 2 2 cu l m 7/ an MD K jigs/7802's WM 3 wwsa vw 3,094,835 13D 3 Sheets-Shee 3 June 25, 1963 K. NlMTZ ETAL METHOD OF AND A MEANS FOR REDUCING THE TENSION ON A BALLOON-FORMING TWIST SPI Filed June 15, 1960 United States Patent This invention relates to a method of and means for a reducing the yarn tension on any type of balloon-forming spindle, particularly on a double twist spindle.

If the balloon which forms during the twisting operation is given full freedom to expand, friction between the yarn and the air as well as the engendered centrifugal forces subject the yarn to tension. In view of this fact it is already the practice to provide balloon limiters with the object of constraining the balloon and thereby preventing centrifugal forces from increasing the tension of the yarn, or at least of minimising their effect. Known balloon limiters have the form of rings or of cylindrical bodies which support the yarn uniformly around the entire circumference of the balloon. However, this arrangement which has given rise to the construction of balloon limiters of various modified kinds still does not exhaust every available possibility of reducing the tension of the yarn.

It is the object of the present invention to provide a means of further reducing yarn tension on balloon-forming twist spindles, particularly on double twist spindles, where the yarn having been intercepted by the limiter from substantially the zone where ballooning is generated tends to balloon out to a maximum balloon diameter.

According to the invention the solution of the contemplated problem consists in imparting kinetic impulses to the yarn directed inwardly towards the centre of the balloon at zones distributed around the periphery and/or axial length of the balloon. These inwardly directed impulses impress a shape upon the balloon which, at least at the zones of application of the said impulses, will be defined by a diameter less than that which corresponds with its maximum diameter. Consequently the balloon will skip from one point of impulse application to the next, traversing the intervening space more or less freely. Consequently the total friction will be less, resulting in a reduction of the tension of the yarn. Moreover, the overall size of the balloon will be constricted so that the tension engendered by centrifugal forces will likewise diminish.

For performing this method the invention provides a balloon limiter which comprises at least one ring in its interior, said ring being provided with inwardly projecting sections. This ring may be of undular conformation. The undulations may have a saw-tooth shape. It is also possible to give the inside edge of the ring a polygonal shape.

Furthermore, axially adjacent rings may be arranged in such manner that their inwardly projecting sections are angularly equidistantly staggered. This latter arrangement not only constricts the balloon but also imparts a kind of wobble motion to the travelling yarn. Unexpectedly, this has likewise been found to reduce the total yarn tension.

According to the invention smooth rings may also be used in place of rings formed with inwardly projecting sections. In this alternative form of construction at least two axially spaced smooth rings which have no projections are positioned with their centres located on an imaginary helix surrounding the limiter axis at a given distance therefrom. If a plurality of rings thus disposed is provided, they will likewise impart a wobble motion Ice to the ballooning yarn and thus secure the aforesaid advantages. t

It will be readily understood that the axial length of the rings is not necessarily very short. Rings may in fact be used which represents small cylinder sections, in other words sleeves, or the like.

A number of preferred forms of construction of suitable rings are shown in the drawings and illustrate the present invention. In the drawings:

FIGS. 1 and 2 are plan views of balloon limiters according to the invention,

FIG. 3 is an alternative formof construction.

FIG. 4 is a vertical axial section of the embodiment shown in FIG. '3,

FIG. 5 is a plan view of yet another form of construction, and

FIG. 6 is a vertical axial section of the embodiment shown in FIG. 5.

20 in FIG. 1 indicates the balloon limiter proper, i.e. the envelope of the limiter which is of smooth cylindrical shape. 21 is a ring formed on its inside periphery with inwardly projecting sections, the said sections on the illustrated ring being undular. The inwardly projecting sections are indicated by 22 and it will be clear that when the ballooning yarn strikes these elevations it will more or less skip across the intervening recessed portions 23. The yarn therefore travels part of its way freely suspended in space and since the points of support are distributed around the periphery its actual friction by licking the limiter proper is practically negligible. At the same time the described arrangement constricts the external periphery of the balloon at least at the levels where constraining rings 21 have been fitted.

The overall shape of the balloon which will now form is, of course, a function of the speed of rotation of the balloon.

Instead of only one ring several such rings arranged in analogous manner may be provided axially spaced the one above the other. Moreover, the elevated and recessed portions of the different axially spaced rings may be angularly displaced, an arrangement which likewise has a favourable effect upon the shape of the balloon.

FIG. 2. shows a different form of limiter 20 in which the inside edge of the ring 24 has a saw-tooth conformation. This limiter can be used only for the control of a balloon travelling in the direction of rotation indicated by arrow 25. Otherwise, the ring functions in the manner already described in detail with reference to -FIG. 1.

FIGS. 3 and 4 show polygonal rings inserted into the body 20 of the balloon limiter. Four hexagonal rings indicated by numerals '1 to 4 are axially spaced. This arrangement of the rings, the one above the other, is readily seen in FIG. 4. Again the effect of the arrangement is analogous to that already described with reference to FIG. 1.

Whereas in the forms of construction shown in FIGS. 1 to 4 rings with elevations and depressions are disposed concentrically around the centre axis of the limiter, FIGS. 5 and 6 illustrate a limiter according to the invention in which smooth rings are provided which are eccentrically positioned in relation to the limiter axis. The several rings are indicated by reference numerals 11 to 18. The same reference numerals are used in the drawing to indicate the respective specially marked centres of the several rings, which are located on a helix concentrically surrounding the limiter axis. The resultant overall formation of the limiter, illustratively represented in FIG. 6, imparts to the balloon formed by the travelling yarn a particular shape in which the yarn is supported only by specific sections of the several rings, which project well into the inside of the limiter, whereas the yarn will skip across those portions of the several rings which are locatedfurther to the outside.

In the forms of construction shown in the drawings the inwardly projecting sections which impart kinetic impulses to the balloon are equidistantly distributed around its circumference. In particular cases it may be an advantage to distribute these sections in nonuniform manner. The same applies to the relatively angularly staggered elevations at different axial levels, which may likewise be irregularly positioned.

What we claim is:

1. The method of reducing friction and yarn tension on balloon-forming twist spindles, particularly on double twist spindles, which comprises limiting the outer travel of the yarn in the balloon substantially from the zone at which the balloon is initiated and imparting inward periodic impulses to the ballooning yarn at regularly spaced discrete zones around and in staggered order along the axial length of the balloon while the yarn is tending to centrifuge out to a maximum ballooning diameter.

2. A balloon limiter on a balloon-forming twist spindle, particularly a double twist spindle,-for limiting the outward travel of the yarn in the balloon from substantially the zone of initiation, said limiter having internally thereof a plurality of rings, the inner periphery of each of which has inwardly extending slip surface sections which are adapted and arranged to impart periodic impulses to the ballooning yarn whilst this is tending to ii. centrifuge outwards to a maximum diameter, said rings being axially spaced from one another and the said inwardly extending sections being relatively angularly staggered in one ring in relation to another.

3. A balloon limiter on a balloon-forming twist spindle, particularly on a double twist spindle, for limiting the outward travel of the yarn in the balloon from substantially the zone of its initiation, said limiter having internally thereof a plurality of axially spaced rings, which are placed with their centres on an imaginary helix surrounding the axis of the limiter and adapted and arranged to impart inward kinetic impulses to the ballooning yarn whilst this is tending to centrifuge outwards to a maxirnnm diameter.

References Cited in the file of this patent UNITED STATES PATENTS

Claims

2. A BALLOON LIMITER ON A BALLOON-FORMING TWIST SPINDLE, PARTICULARLY A DOUBLE TWIST SPINDLE, FOR LIMITING THE OUTWARD TRAVEL OF THE YARN IN THE BALLOON FROM SUBSTANTIALLY THE ZONE OF INITIATION, SAID LIMITER HAVING INTERNALLY THEREOF A PLURALITY OF RINGS, THE INNER PERIPHERY OF EACH OF WHICH HAS INWARDLY EXTENDING SLIP SURFACE SECTIONS WHICH ARE ADAPTED AND ARRANGED TO IMPART PERIODIC IMPULSES TO THE BALLOONING YARN WHILST THIS IS TENDING TO CENTRIFUGE OUTWARDS TO A MAXIMUM DIAMETER, SAID RINGS BEING AXIALLY SPACED FROM ONE ANOTHER AND THE SAID INWARDLY EXTENDING SECTIONS BEING RELATIVELY ANGULARLY STAGGERED IN ONE RING IN RELATION TO ANOTHER.