US2004153A - Apparatus for winding thread on a bobbin - Google Patents

Description

June 11, 1935. s. w. BRAINARD 2,004,153

APPARATUS FOR WINDING THREAD ON A BOBBIN Filed Oct. 22, 1931 a nven'tot.

J e yin our wilaon .Brainard Patented June 11, 1935 v UNITED STATES PATENT OFFICE APPARATUS FOR WINDING THREAD ON A BOBBIN Seymour Wilson Brainard, Kenmore, N. Y., as-

signor to Du Pont Rayon Company, New York,

N. Y., a corporation of Delaware Application October 22, 1931, Serial No. 570,476

' 2 Claims. (01. 242-l8) wherein the thread is twisted and wound upon a bobbin before being subjected to treatment by liquids. The invention will be described as applied to the manufacture of viscose rayon, although it is equally applicable to other forms of rayon and to the winding of difierent classes of thread.

In the manufacture of artificial thread from viscose by the bobbin process the thread is wound on a bobbin in untwisted condition and is rewound upon a second bobbin with twisting. The

rewinding bobbin is usually surface driven, that is to say, it is driven by the contact of the yarn mass with a rotating roller covered with a relatively dense material such as leather or cork. It is the experience of rayon manufacturers that the thread cakes produced by this method are dense, hard, and difficult to treat with liquids; that they have hard ends; and that the cakes formed by this process often have particular areas which are considerably harder than .the remainder of the cake. Such cakes cannot be thoroughly purified without the use of excessive amounts of purifying liquid and the expenditure of exceedingly long periods of time. More important, they cannot be uniformly purified even when the treatment is sufficiently strenuous to risk degrading the yarn.

An object of this invention is to wind thread into a soft, uniformly liquid-permeable cake. Another object of the invention is to wind rayon into an easily purifiable package. Another object of the invention is to provide an improved winding machine. Other objects of the invention will be in part apparent and in part described in the following specification.

I have discovered that the building up of a hard cake is due, in general, to the fact that the thread on the rewind bobbin makes contact with the driving roller in a band so narrow as to amount almost toa line parallel to the axis of the bobbin. The pressure due to the weight of the rewinding bobbin is, consequently, relatively large per unit area. This pressure causes the formation of a dense, hard cake.

I have also discovered that the formation of hard spots in the cake is due to the inequalities I the rewound cake are formed because more yarn is laid down at the ends than at any other portion of the bobbin due to the reversal of direction of the traverse guide and thread lag between it and the point at which the thread winds onto the bobbin. Since there is more yarn at the ends the weight of the bobbin is borne more by the ends than by the balance of the cake and tightly packed ends result.

The objects of this invention are accomplished, generally speaking, by substantially increasing the area of contact between the thread on the rewind bobbin and the driving roller. The objects of the invention are accomplished, more specifically speaking, by the invention herein described and claimed.

In the drawing, Fig. 1 is an elevational view of a set up for twisting and rewinding; Fig. 2 is a front elevation, showing the rewinding mechanism; Fig. 3 shows a rewinding mechanism with a modified form of driving roller.

In the drawing, numeral I is a bobbin of rayon;

2 is a diagrammatic representation of a thread guide; 3 is the rayon thread; 4 is a guide for traversing the thread from end to end of the bobbin; 5 is a rewind bobbin;. 6 is a roller for driving the rewind bobbin; 1 is a surface on the rewind roller of soft, yieldable material such as sponge rubber. V

Other yieldable materials than soft rubber may be used to surface the roller and act as a broad support and shock absorber between the drive roll' and the rewind bobbin. Felt, various artificial resinous bodies, and loosely wound layers of artificial silk or other yarn are examples of such materials.

Advantage can be secured by altering the shape of the driving roller as shown in Fig. 3, wherein BI is a roller covered with yieldable -material whose central portion alone contacts with the material on the bobbin. By the use of this modification, a cake-of yarn is secured which has soft and easily processed ends.

An advantage of my invention .is the ability to wind 9. soft package of yarn. Another advantage of my invention is in the ability to wind 9.

cake of yarn which may be easily, quickly, and uniformly purified. Another advantage is in the preparation of a package so loosely wound that shrinkage may take place without setting up strains which degrade the yarn. Other advantages of the invention will be apparent.

As many apparently widely different embodiments of' this invention may be made without departing from the spirit and scope thereof, it is to be understood that I do not limit myself to the face in driving contact. with the material wound specific embodiments thereof except as defined in thereon.

the appended claims. 2. In the manufacture of rayon, a winding bob 1 claim: bin, and a roller having a sponge rubber surface v I 1. In the manufacture of rayon, a winding bobin driving relation to the center thereof. 5

bin, and a roller having a soft and yieldable sur- SEYMOUR W. BRAINARD.

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