US2503936A - Yarn guard for double twist spindle assembly - Google Patents

Description

April 11, 1950 J. K. COCHRAN 2,503,936

YARN GUARD FOR nouaus TWIST SPINDLE ASSEMBLY Filed April 20, 1948 INVENTOR.

JOHN hi COCH/PA/v Patented Apr. 11, 1950 poration oi Delaware YARN GUARD FOR DOUBLE TWIST SP INDLE ASSEMBLY John K. Cochran, Conyngham, Pa., assignor to The Duplan Corporation, Hazleton, Pa., a cor- Application April 20, 1948, Serial No. 22,064

Claims. (Cl. 57-58) This invention relates to textile yarn spinning and twisting and particularly to double twist spindle apparatus and operations.

In spinning and twisting textile yarns in which a double twist is imparted to the yarn, a so-called double twist spindle rotates at high speed coaxially within a yarn supply spool holder which is relatively stationary. The yarn from the spool passes downwardly through the center of the spool holder assembly and the spindle is an overend relationship, thence transversely outwardly from the spindle and upwardly through space to a take-up spool located above the yarn supply spool. A yarn guide rotor is attached to the double twist spindle to guide the yarn as it leaves the spindle. This yarn guide rotor rotates with the spindle. Since the yarn guide rotor is cupshaped, partially enveloping the yarn supply package carrier, an air gap results between these two parts of the apparatus. This air gap separates the rotating part from the stationary part and, as a result, air currents are induced therein during operation.

It has been found that these air currents alternately flow in opposite directions, that is, inwardly toward the center'of the rotating spindle and outwardly into space. The inwardly induced air current in this gap tends to draw the yarn and other waste material into the gap between the rotating parts. Also, the yarn, being drawn inwardly toward the air gap, rubs against the upper edges of the guide rotor and the package carrier so that unless these surfaces are made perfectly smooth, the resulting wear adds to yarn breakage.

The obvious expedient of covering this air gap with a thin annular strip is not satisfactory since the outer end of the air gap merely is located in a different position and the air currents are not eliminated. This problem has vexed those engaged in double twist spinning textile yarns.

Therefore, it is an object of this invention to provide a method and apparatus for preventing yarn and other waste from being drawn between the rotating and stationary parts of a double twist spindle assembly.

It is another object of this invention to provide a guard covering the air gap between the rotating and stationary parts of a double twist spindle assembly.

It is another object to provide a method and apparatus for altering or eliminating the influence on the yarn of the induced air currents between the stationary and rotating parts of a double twist spindle.

Further objects will 'be apparent from the tollowing'description, claims and drawing in which: Figure 1 is a cross sectional view of a double twist spindle and yarn spool holder assembly with ends cut away and showing the yarn guard in position; and

Figure 2 is a plan view of the guard.

With reference to the drawing, a double twist spindle H comprises a'hollowed blade portion l2 and a whorl portion I3. Transverse outlets l4 and 15, located at the juncture of the blade and whorl portions, provide passage outwardly for the textile yarn passing through the hollowed blade I2.

A rotor member comprising a take-up disc portion It and a yarn guide portion I1 is firmly attached to the spindle so that the take-up disc I6 is in alignment with the transverse outlets l4 and I5 of the spindle. The yarn l8 passing outwardly through passage I4 or ii of the spindle is wrapped partially about the take-up disc 16 and guided upwardly through space by the rotor guide l1. The rotor comprising the take-up disc l6 and the guide I! rotates with the spindle.

The yarn supply spool holder comprises fundamentally a tubular supporting member 2! attached, in a preferred form, to an annular cupshaped member 22. Thespool holder is supported in co-axial relationship with and by the spindle II by means of roller or ball-bearing assemblies 23 and 24. The inner race of each of these bearing assemblies is attached to the blade portion l2 of the spindle while the outer race is attached to the tubular portion 2| of the spool holder. Normally this apparatus is mounted at an angle and a weight of any preferred form is supported within the annular cup-shaped member 22 to retain the spool holder substantially stationary, while the spindle II and its rotor assembly rotates at a high speed.

As may be seen in the drawing, an air gap 25 separates the rotating rotor guide II from the relatively stationary package carrier member 22. This air gap 25 extends to the bearing. It has been found that, during the operation while the rotor I1 is rotating at a high speed, an unstable vacuum condition is produced in the air gap 25 in the space 25' near the bearing assembly. This unstable condition in the air gap induces an air flow alternating in direction within this annular space. When the air flow is inwardly the thread ot yarn I! and other waste tends to be drawn into the gap. Although in many instances the yarn may not be drawn into the gap, it may contact theupper edge of the rotating rotor guide I1 or the 3 annular cupmember 22 and the resultant wear causes breakage.

In accordance with this invention, a centrally apertured circular disc 3| having a flanged outer edge 32 is located in co-axial alignment with and supported by the spool holder. This annular disc extends outwardly across the open end of the air gap with the flanged outer edge extending downwardly about the annular upper surface of the rotor guide H. The disc or guard 3| may be supported in any desired way by the yarn supply spool holder and thus becomes one of the stationary elements of the assembly. In a preferred form, as illustrated, an annular channel 33 is formed in the upper surface conforming to the shape of the annular cup-shaped member 32. With this particular construction the disc 3| may be held by friction on the yarn supply holder. It will be apparent that other means may be used to support this yarn guard.

The rotating rotor guide I! creates an air stream flowing outwardly and upwardly from its outer surface as illustrated by the arrow 4|. This air stream indicated by the arrow 4| will be more than suflicient to supply the demand created by the induced air current flowing into the air gap 42 between the flanged edge 32 of the disc 3| and.

the outer surface of the rotor ll. Thus, any inwardly flowing air current within the air gap 25 and the air gap 42 will be supplied by the induced air current from the rotating yarn guide ll. At the same time, since the air current indicated by the arrow ll from the rotor guide ll is more than sufficient to supply the demand of the induced current in the air gap 25, there will be a flow of air outwardly from the flanged edge 32 of the yarn guard or disc 3|. In this way, not only is the demand of the current within the air gap 25 fully met, but the excess air flow created by the guide I! causes the yarn I8 to be forced outwardly or away from the open end 42 of the air gap. With this construction there is no tendency of the thread of yarn H! or other waste material to be drawn within the air gap 25.

By covering the open end of the air gap 25 and relocating the end of the gap by means of the. flanged edge 32, to a position along the side of the rotating rotor ii, a completely satisfactory though simple solution has been found for the problem.

While the preferred form has been illustrated and described, it will be apparent that modifications are possible without departing from the scope of the invention.

What is claimed is:

1. In a double twist spindle assembly for textile yarns having stationary and rotatable parts, and an air gap between said parts, a yarn guard comprising a centrally apertured circular disc having a flanged outer edge, said disc covering said air gap.

2. In a double twist spindle assembly for textile yarns, a yarn guard comprising a centrally apertured circular disc having a flanged outer edge, the upper surface of said disc covering the air gap between rotatable and stationary parts of said assembly, said flangedouter edge extending over the upper outer surface of the rotating parts of said assembly.

3. In a double twist spindle assembly for textile yarns comprising a yarn spool holder and a double twist spindle having a yarn guide rotor, a guard comprising a centrally apertured circular disc having a flanged outer edge, said guard being supported by said spool holder and having said flanged edge extending downwardly over and about the outer edge of the yarn guide rotor.

4. In a double twist spindle assembly for textile yarns having a rotatable spindle and a stationary yarn supply package holder and an air gap between the rotating and stationary parts, a centrally apertured circular disc covering the open end of said air gap, said disc having a flanged outer edge extending downwardly over the outer edge of the rotating parts of said spindle.

5. In a double twist spindle assembly for textile,

yarns, a yarn guard comprising an annular strip having a flanged outer edge, said annular strip covering the air gap between rotatable and stationary parts of said assembly, said flanged outer edge extending over the upper outer surface of the rotating parts of said assembly.

6. In a double twist spindle assembly for textile yarns having stationary and rotatable parts and an air gap between said parts, a yarn guard comprising an annular disc having a flanged outer edge, said disc covering said air gap.

7. In a double twist spindle assembly for textile yarns, a rotatable spindle having a rotor guide attached thereto and a stationary spool holder, there being an air gap between said spool holder and said rotatable rotor guide, a centrally apertured circular disc covering said air gap having a flanged outer edge extending about the upper surface of said rotor guide.

8. In a double twist spindle assembly for textile yarns comprising a yarn spool holder, a double twist spindle in co-axial relationship with said spool holder, said spindle having a yarn guide rotor attached thereto, said spindle being rotatable within the relatively stationary spool holder, a centrally apertured circular disc having a flanged edge and supported by said spool holder, the upper surface thereof covering the gap between said rotor and said spool holder and the flanged edge thereof extending downwardly about the upper outer edge of said yarn guide rotor.

9. In a double twist spindle assembly for textile yarns having a stationary annular cup-shaped supply package and a rotatable spindle having a yarn guide, there being an air gap between said package carrier and said yarn guide, a centrally apertured circular disc having a channel surface conforming to the shape of said package carrier and supported thereby, said disc extending across said air gap and having a flanged outer edge extending downwardly about the upper outer surface of said yarn guide.

10. In textile yarn spinning and twisting operations in which there are rotating and stationary parts separated by an air gap, the method of preventing the yarn and waste material from being drawn into the air gap by the induced air current therein which consists in creating an air current tangentially outwardly from the outer surface of the rotating part and introducing a portion of said created air current into said air gap to satisfy the inwardly induced current requirement thereof.

JOHN K. COCI-IRAN.

No references cited.

Certificate of Correction Patent No. 2,503,936 April 11, 1950 JOHN K. OOCHRAN It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 1, line 10, for the word is after spindle read in;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 4th day of July, A. D. 1950.

THOMAS F. MURPHY,

Assistant Uommissz'oner of Patents.

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