US2017611A - Core for thread or yarn packages - Google Patents

Description

ocr. 15, 1935. B, STOGNER 2,017,611

CORE FOR THREAD OR YARN PACKAGES Filed Nov. 44, 1933 Patented Oct. 15, 1935 UNITED STATES PATENT OFFICE CORE FOR THREAD OR YARN PACKAGES Lawrence B. Stogner, Hartsville, S. C., assignor .to Sonoco Products Company, Hartsville, S. C.,

a corporation of South Carolina Application November 4, 1933, Serial No. 696,734

2 Claims.

5 such windings, transportation of the same, and

nal unwinding upon a machine for the fabrication of cloth by knitting or weaving processes.

The invention contemplates the provision of a core of this type' which is designed particularly for use in connection with winding machines. In such a machine a thread of great length, equal for instance to the combined lengths of the threads wound upon a plurality of bobbins, is Wound into the form of a relatively large cylindrical package, commonly known as a cheese During the winding of such package upon a core of the type contemplated in the present invention, the core is supported for revolution about its own axis upon a freely revoluble carrier member. When the package iscompleted or has reached the desired size, this core, with thread package thereon, is slipped off of the carrier and is ready for transportation to a warping machine or other textile unit.

Heretofore thread cores of this general type have been fabricated of metal, bakelite, or other expensive materials, and it has not been deemed commercially feasible to ship or transport thread packages from mill to mill owing to the relatively large investment in the core itself, large numbers of which would necessarily have to be used with each winding machine were the product of that machine shipped substantial distances. I-Ieretofore economy has required that the numbers of cores used and each winding machine be minimized, land this in turn has necessitated retention of the cores at the plant where the winding opera-tions are carried out.

In accordance with the present invention, however, a thread core is provided which may be produced at a minor fraction of the cost of production of cores of the type heretofore used, which permits the use, with economy, of many more cores per winding machine, enabling the operator of the machine to ship his thread windings or packages, duly mounted upon cores, for long distances. In fact thread cores of the type contemplated by the present invention may be fabricated at such low cost that they may be used only once and thereafter discarded, thus making it possible for .a knitter or weaver located at one point to buy thread packages fabricated at a distant point and to furthermore hold in stock at his own plant any desired quantity of such packages, the cost of the core adding only ,an insignicant amount to the cost of the package. the thread is unwound from the novel core, it may be discarded if desired without appreciable loss.

In connection with plants having winding machines andralso provided with fabricating machines suiioient in number to utilize the entire output of the winding'machine, it may be economically advantageous to repeatedly use the thread cores, and wherever such reuse is to be practiced, l0

the paper cores contemplated by the present invention may be subjected to a hardening process whereby the core is made stiffer and well able to with stand impacts which it necessarily meets with in such repeated use.

In addition to the great advantage of reduced cost, thereby permitting wider usage, the core in and of itself has many advantages over similar devices of the prior art. It is light in weight, being very considerably lighter than metal or bakelite cores of the type heretofore most commonly used. It furthermore possesses superior yarn retaining qualities whereby a thread or yarn package is caused to cling tightly thereto during both winding and unwinding operations and during shipment. It is attractive in appearance and more convenient for the mill operator to handle by reason of its lighter weight .and roughened surface. Still other advantages of the invention will be apparent to those skilled in the art.

In the accompanying drawing, two forms of the improved core are disclosed by way of example. It will be appreciated that in its minor details the core may be considerably varied in designand construction in adapting the same to 35 winding machines of various types.

In the drawing:

Figure l is an axial section through one form of improved core, showing the same to be mounted upon a revoluble holder of a winding machine and showing a thread winding thereon;

Figure 2 is a side elevation of the same thread core, with package removed, partly broken away to show details of construction;

Figure 3 is an axial section through a slightly 45 modified type of thread core constructed in ac cordance with the invention; and

Figure 4 is a section on line `4--4 of Figure 3. The member indicated at Ill in Figure 1 of the drawing is the swinging arm oi. a winding machine, and the cylindrical member l I comprises a holder for the thread core, this member being supported by the arm I0 for free revolution about an axis normal to the arm. Elements I0 and Il just described form no portion of the present After invention and may vary considerably in design and arrangement of parts. It may be said, however, that member II is provided with a thread core retaining device which, in this instance, includes ball members I2 normally pressed by springs (not illustrated) so as to project outwardly through apertures I3 formed in the cylindrical surface of revoluble holder II. These ballA members in reality comprise yieldable detents adapted to interlock with the thread core and to prevent accidental axial sliding movement of the thread core on member I I, but which members yield when any appreciable force is exerted on the thread core tending to move it axially of the. holder I I and to thereby release the holder. A typical thread package of the cylind drical type is indicated at I4.

The thread core shown in Figure 1 is also illustrated in Figure 2 but in greater detail. It comprises an inner section, indicated generally at I5, and an outer cover, indicated at I6. The inner section is built up of a plurality of concentric paper cylinders secured together by a suitable adhesive so as to form a single, unitary, compact, and relatively stiff and strong supporting cylinder. The paper of which these individual cylinders is fabricated, while not of high quality or great cost, is relatively dense and smooth so that the resulting cylinder has considerable mechanical strength. The cover I6 for the inner section of the core is preferably of relatively soft embossed paper so that the inner windings of the thread package supported by the core tend to cling to its surface.

While the core as thus far described may be fabricated by various methods, I prefer to form the inner section I5, which, as previously explained, comprises a plurality of concentric cylinders secured together, by spirally winding a plurality of paper strips upon a cylindrical mandrel, one upon the other, and thereafter severing the relatively long tube thus formed into proper core lengths. Each of the cylinders which come over the inner structure I5 may therefore be said to comprise a single sheet of paper, the meeting edges of which abut along a line spirally disposed with respect to the axis of the core. The several sheets are so arranged that the joint between the edges of each is covered by an unbroken surface on the next adjacent sheet, this method of breaking joints insuring that the inner structure has a maximum strength for the weight of paper employed in its construction. The outer layer I6 of paper is applied immediately after the formation of the inner structure' and is wound convolutely instead of spirally, its edges meeting along a line parallel to the axis of the core. Preferably the meeting edges of the paper sheet I5 are mutually chamfered or beveled so that no ridge is formed along the line of -meeting After the application of the covering sheet I6, the paper core is subjected to two further operations. In one operation it is revolved relatively to a tool insertedin its interior, which exerts a very considerable outward pressure against the .inner surface of the core, this relative rotation of tool and core continuing until a very substantial groove, indicated at I'I, is formed interiorly thereof, the paper body displaced in the formation of the groove appearing exteriorly of the otherwise cylindrical exterior surface of the core so as to form a rib I8. One annular end of the core is then upsetY or deformed, preferably by pressing the end surface against an annularly grooved and rapidly rotating die. this operation being continued until the end of the core is deflected in wardly as shown in Figures 1 and 2, the end surface I9 being preferably turned to lie in a plane transverse of the axis of the core, as shown.

When in use, the inturned end of the core con- 5 stitutes a means not only for insuring that the core is applied to the holder II by movement in one direction only, but it also constitutes a stop limiting the movement of the core onto the holder and thereby preventing the opposite end of the 10 l core from coming in contact with the arm Il) which would naturally frictionally retard rotation of the holder relatively to the arm. The provision of a stop such as indicated also insures that the core will be so positioned on the holder 15 that the retaining members I2 will exactly engage within groove I1.

In the manufacture of the form of spool disclosed in Figures 3 and 4 of the drawing, substantially the same series of operations are car- 20 ried out. An interior structure comprising a series of -concentric paper cylinders is indicated at 20, and a covering sheet of roughened or embossed paper, indicated at 2l, is aiiixed thereto. In the case of this core, however, no external rib 35 is formed, the groove 22 being formed either by simply compressing the paper by a suitable tool or by removing a portion of the same by a grinding tool. In addition a plurality of circular holes, one of which is indicated at 23, are formed in the 3Q wall of the core, these holes opening into the bottom of the groove 22. The spring-pressed members I2 may enter these holes when the core is placed upon a holder such as II, thus providing additional interlock between the core and holder. 3,5 Instead of inturning the end of the core as in the case of the invention first described, minor sections of the same adjacent one end are displaced by stamping or punching operations, four interiorly projecting tabs or deformed portions 24 be- 40 ing thereby formed. The inner edge surfaces 24 of these portions 24 comprise abutment surfaces which strike the outer end of holder II when the core is placed on the holder, thus limiting its movement and insuring proper interlocking of 45 the detents I2 with the core and preventing the end of the core from striking the arm I0.

As has been before explained, cores fabricated in accordance with the invention may be subjected, if desired, to the action of a hardening 50 compound; for instance, they may be impregnated with sulphur after being otherwise completely formed and, when'so treated, attain great hardness, thus enabling them to be used many times. If, however, the novel paper coresare 55 intended for a single use only, as where it is intended that they shall be shipped with thread packages thereon from one plant to a distant plant, hardening in this manner is quite unnecessary, a papercore formed as described being well 60 able to withstand the impact and shock incident to transportation without damage. By placing the surface covering on the inner structure as a convolute winding, it acts as a substantial retaining layer for the outer paper cylinder of the inner structure, preventing loosening of the tapering corners of the sheet which comprises this layer. Were the covering sheet I5 omitted, one or other of the pointed ends of the spirally formed 70 outer layer of the inner structure might become loosened in use, thus providing an upward projection which might be caught by the thread with resulting damage or breakage to the thread.

Having thus described the invention, what is 7,5

claimed as new and desired to be secured by Let- 2. A cylindrical paper core having a groove ters Patent is: formed interiorly thereof, in a trnsverse plane,

1. A cylindrical paper core for a yarn packand a plurality of apertures forrned in the bottom r age having spaced inwardly distorted portions of said groove and extending through 'the wall adjacent one end thereof, said portions comprisof the core.

ing stop means to limit the movement of the core LAWRENCE B. STOGNER. onto a. cylindrical core holder.

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