US2448217A - Thread guide - Google Patents

Description

Aug. 31, 1948. v. E. GONSALVES I 2,448,217

THREAD GUIDE Filed Sept. 30, 1946 liblarlhmlfiaualm I Pmmd Aug. 31, 194s rimasn GUIDE Victor E. Gonsalves, Arnhem, Netherlands, as-

signor to American Enka Corporation, Enka, N. C.,'a corporation of Delaware Application September so, 1040, Serial a... 100,233 In Germany February 12, 1941 Section 1. Public Law 690, August 8, 1948 Patent expires February 12, 1961 '1 Claims. (Cl. 242-157) This invention relates to thread guides and .is more particularly concerned with a thread guide of the low friction type.

In the manufacture of threads such as rayon,

a plurality of parallel filaments are extruded into a spin bath and the resulting yarn is thereafter subjected to various aftertreatments which are performed either continuously. discontinuously, or after the thread has been wound intopackage or cake form. However, regardless of the mode or nature of the aftertreatment, it is universally necessary to guide the yarn in its path between the spin bath and the ultimate point of collection and in order to perform this function, several thread guides are used. The arrangement of the thread guides varies, of course, with the natureof the process and the particular installation, but since the parallel filament yarn that is led from the spin bath maybe quite fragile, it is important that the friction between the thread and the various guides be maintained at a low level because high friction often results in thread breakage or the production of thread lengths that havebeen subjected to variable stretch.

In an efl'ort to overcome the friction problem with regard to thread guides, it has been'customary to employ guiding elements of a freely rotatable type or to provide stationary elements having a surface of low friction coefilcient. The stationary type of guide even if made of smooth porcelain, still imparts considerable drag to the thread and may cause breakageand undesirable stretch.

It is therefore an object of this invention to provide a thread guide of the non-rotatable type which imparts minimum drag to a thread or yarn guided thereby, while at the same time restraining the thread or yarn against displacement in an arc in excess of 180. 7

It is contemplated, according to this invention, 7

that a thread guide be continuously oscillated through a very short path in such manner as to minimize the friction of the thread passing 'therethrcugh.

Other objects and advantages of this invention will be apparent upon consideration of the following detailed description ofa preferred embodiment thereof in conjunction with the andrawing, the single figure of which discloses a thread guide and associated oscillating means constructed in accordance with the prestail, thereference numeral i represents a movwhere guiding means is required. The thread is led over a guide bar 2 through a hook type guide 3 positionedabove the guide bar 2 and then over a guide bar ,4 so that a tension is created in the thread at a point in front of the thread guide I and another tension is created in the thread at a point beyond the thread guide 2. As a result of this threading up arrangement the tension between bar 2 and guide 2 would be substantially less than the tension between guide bar. 4 and guide 3, if the hook type guide 2 were maintained stationary. However, in order that the differential tension in the path leading to the thread guide 3 and in the path leading from it may be equalized, the thread guide 3 is mounted on a core 5 of a material permeable to a magnetic field such as nickel. This core is mounted in any suitable manner by means not shown for free movement through a coil 8, the ends of which are connected to a lbw frequency source of alternating current, not shown. It can be seen that, when the circuit to the coil I is energized by an alternating current, an alternating magnetic field is created under the influence of which core 5 and the thread guide 3 attached thereto are caused to oscillate vertically. It has been found that superior friction reduction results if the core is oscillated at the rateof 10 cycles.

While the oscillation of the thread guide I'has been described in conjunction with a thread path including. guide bars 2 and 4, it is to be understood that in some installations said bars may be eliminated or replaced by other thread guiding elements. It is also apparent that in lieu of the hook type thread guide other types of non-rotatable guides may be attached to the core 5 within the scope of this invention .as defined in the appended claims.

What is claimed is:

l. A thread guide assembly comprising an oscillatable thread guiding element contacting a thread, and means for oscillating said element in a plane at an angle to the thread path at a rate of 10! cycles.

2. A thread guide assembly comprising an oscillatable'threarl guiding element at least parcillatable thread guiding element at least partiaily enveloping a thread, a core of permeable material supporting said guide, and means establishing an alternating magnetic field acting on said core to cause the same to oscillate.

4. A thread guide assembly comprising an oscillatable thread guiding elementat least partiallyenveloping a thread, a core or permeable nickel "material supporting said guide, and

- means establishing an alternating magnetic field acting on said core to cause the same to oscillate.

5. A thread guide assembly comprising an oscillatable thread guiding element at least par-, tially enveloping a thread, a pair of guide rods disposed below said element and in the thread path leading thereto and therefrom, and means for oscillating said element. i

- 6. A thread guide assemhly comprising an oscillatahle thread guiding element at least-partially envelop ng a thread.- a core oi permeable material supporting said guide, a pair oi! guide r051 disposed below vsaid element and in the ,thread path leading thereto, and therefrom. and means establishing an alternating magnetic iield acting on said core to cause the same to oscillate.

VICTOR E. GONSALVES.

REFERENCES crrnn The following references are of record in the file oi this patent:

UNITED STATES PATENTS Number Name Date 1,149,224 Sill Aug. 10, 1915 2,425,090 Wilhelm Aug. 19, 1947 OTHER REFERENCES Radio Amateurs Handbook, 1946 edition. published by The American Radio Relay League.

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