US2736506A

US2736506A - Traverse-roll

Info

Publication number: US2736506A
Application number: US334606A
Authority: US
Inventors: Selby Donald William
Original assignee: EI Du Pont de Nemours and Co
Current assignee: EIDP Inc
Priority date: 1953-02-02
Filing date: 1953-02-02
Publication date: 1956-02-28
Anticipated expiration: 1973-02-28

Description

D. W. SELBY TRAVERSE-ROLL Feb. 28, 1956 Filed Feb. 2. 1953 INVENTOR DONALD WILLIAM SELBY ATTORNEY Unite TRAVERSE-ROLL Application February 2, 1953, Serial No. 334,606

13 Claims. (Cl. 242-43) This invention relates to grooved rolls for traversing yarn and more particularly to rolls made from inner and outer concentric shells with the outer shell having a slot therein to traverse the yarn during. the winding of a yarn package.

The traversing rolls described in the copending application of Calhoun and Cook Serial No. 92,176, filed May 9, 1949, and now U. S. Patent 2,646,227, are generally pre-eminently satisfactory for winding yarns at high speed on to packages. To reduce the cost of such traverse rolls and to reduce their weight to make for easier handling, it is desired to manufacture the rolls from hollow concentric shells. However, when these rolls are made from concentric cylindrical shells, for some reason high and erratic tensions occur at the reversal points of the stroke. This condition results in degradation of the yarn at the ends of the stroke by causing broken filaments. Further, hard yarn layers at the ends of the package are formed, and poor package formation and unwinding difliculties result. Afurther undesirable result of this periodic stressing of the yarn and the maintaining of these varying stresses in the yarn package is non-uniformity. in the dyeing characteristics which shows up as so-called barre patterns (e. g., ladder and diamond patterns) in woven or knitted fabric.

While the above diificulties do not attend the use of solid traversing rolls, the economy involved'niakes the use of hollow rolls an attractive objective. Thus, an object of this invention is to provide a low-cost traversing device for winding threads, yarns and the like at high speeds without damaging the product to give improved packages relatively free from dense layers of yarn and easy to unwind in subsequent operations. Another object is to make a traversing device which is simple and inexpensive to build and easy to clean and maintain in operation. A still further object is the provision of a rapid reversal of the strand at the end of the stroke without producing high or "variable tension levels. Other objects will become apparenthereafter in the specification and in 1 6 claims.

The objects of this invention are accomplished by constructing traversing rolls out of concentric cylindrical shells with the outer shell slotted in the desired'rnanner to perform the traversing function and containing a guide, at the reversal points, running radially between the concentric shells to act as yarn bearing members at the stroke extremities.

For example, in overcoming the above mentioned ditiiculties, a pin, preferably of round or elliptical crosssection, is placed at each reversal point. This pin has preferably a hard, Wear-resistant surface, for example, Alsimag, to withstand the cutting and abrasive action of certain yarns, particularly delustered yarns. Since even the hardest and most wear-resistant materials available are still somewhat subject to wear under the most adverse conditions, the pin has been made easily and quickly removable to permit change as required or at regularly scheduled intervals. The invention is not lim- States Patent i 2,736,506 iPa tented Feb. 28, 1956 ited to the us of a p r the g ide may e a series of pins or a suitably shaped sheet of metal substantially spanning the gap between the shells and following the inner edge of the groove. The apparatus is more completely described in the following description but is not limited thereby.

In the drawings:

Figure 1 is an axial cross-seetiona l view of a traversing roll;

Figure 2 is a development of the surface on the outer cylindrical shell showing the slot and the position of the pm at the reversal point and F gure 3 is an enlarged view of this development at on of the reversal points- Referring now to Figure i, it is seen that inner shell 2 and outer shell '1 are suitably heldin concentric relationship with hub 3 by suitable spacer elements 4 which might readily be flange elements or radial spider elements. Concentric shells l and 2 can be afiixed to these support elements lay-conventional. means, such as screwing, brazing, welding, or 'thelike. The endless groove 6, shown in Figurefs Zand 3:, runs in the outer'shell 1. Actually, the shell 1is-cntFthrough-sQthat the shell 2 forms the, base of the groove. The guides, such as pins 5, run between the two shell.

elements

1 and 2 at the reversal points. These pins are preferably madeof a hard, wearrsistant substance, for example, --Alsimag (bonded titanilimdioxide). Other materials very suitable for use with cutting or abrasive yarns are tungsten carbide, sapphire, chromium. plated steel, Isolantite (ceramic), "lulu-m (nickel-chromium alloy), porcelain, and Tantung G (cutting tool alloy). Less wear-resistant materials -may-be ,us'edforthese pins where the yarns being wound will permit. In the absence of the pins, the yarn traverses properly over the major portion of the groove, being directed by the-walls of the groove in the outer shell, but at the -reversal points, in the absence of guides the yarn tends to slip under the outer shell and out .ofthe groove. Pins 5 prevent this and the yarn runs-properly under-uniform tension. The thickness of the Shells is such that the device is a sturdy, economical unit. Since the yarn-rubs against the: edges of the groove onlhe top shell, these inner walls and its edges are generally smooth and rounded.

The diameter-0f the pins can vary from 541, up to l z-or /4 or-even'largier, depending in part on the textile material being wound, the shape: of the. reversal point, the method of securing the pin, and the like. Preferably, when windingssynthetic-textile fibers prepared from polyamides. 'acrylonitrile polymers or polyesters and the like, the diameter will fall within the limitsof 1 to /2". The filament bearing members are replaceably held in positien'by any of the well known means. For pins, 531Gb means might be theme of a threaded plug in the outer shell to keep the-pin seated in the holes drilled in the inner-and outer shells. Another means might be the use of'atpositioning depression in the underside of the outer shell and a relatively deep spring detent in the lower or inner shell. Another means might be a positioning depression in the inner shell with a spring clip device in the outer shell to hold the pin in position.

The guides should not be more than /2" behind the reversal points to achieve all the advantages of this invention. Preferably the guides abut the edges of the reversal points but for practical reasons (rounded shell edges, pin holding means, etc.) they usually are removed by to 5 from the edges of the reversal points in the outer shell.

As shown in Figure 2 another feature of this invention is that the thread traversing slot erupts at 7 through the edges of the shell at the reversal points. This feature provides Working space to permit replacement of the pin and additionally provides a valuable self-threading feature; that is, once the yarn end has been started on to the package and rotation begun, the length of the yarn may merely be allowed to fall against the edge of the rotating traverseing roll to complete the threading operation and to cause the self-traversing feature to become operative. Edge 8 is preferably rounded as shown while edges 9, which can also be rounded, are preferably angular, because yarn pick-up is better. Also surfaces of the groove are ground smooth. The roll rotates in the direction indicated by the arrow 10 in Figure 2.

As shown in Figure 3, the edges of the slots of the particular roll form an angle of 14 with the edges of the shell except that for a short distance at the reversal point this angle is 20. The helix angle over the major portion of the groove may vary from to 25, angles of 9 to 20 being preferred. At the rapid reversal the angle is greater than the normal angle and may vary from to 90. The quotient of the normal helix angle is degrees divided by the depth of the groove in inches should not exceed 40 and is usually between 5 and 40, preferably about 10 to 20. The depth of the groove, that is, the distance of the top surface of the inner shell from the top surface of the outer shell my vary from A to 2". Generally, this depth is from /2 to 1 /2". The width of the groove may vary from about A; to about 1 and generally the overall diameter of the traversing device of this invention is from about 5 to about 30",

diameters of 6 to 12" being preferred. An example of a particular traversing device is one which has a 16 helical groove having a angle at the reversal point. The diameter of the outer shell of this example is 7.9, the diameter of the inner shell being 5.9". With a groove depth of 1, the groove width being A", the quo-' that the guides extend the full distance to prevent any possibility of a thread becoming caught.

The traversing rolls herein described are in most instances pre-eminently satisfactory for use as self-traversing drive rolls, wherein the rolls surface rotates the bobbin through surface contact, initially with the empty bobbin, and subsequently with the yarn on the partially filled bobbin.

Any departure which conforms to the principles of this invention is intended to be included within'the scope of the claims below.

I claim:

1. Apparatus comprising a rotatable member comprising an outer shell and an inner shell, said outer shell being provided with an endless groove in its surface helically cut in its major portion at an angle of from 5 to 25 said groove containing at least two rapid rei versal sections cut helically at an angle greater than said angle in said major portion, and the distance from the top surface of said outer shell to the top surface of the said inner shell being such that the quotient of the helix angle in said major portion in degrees divided by said distance in inches is between 5 and 40; and at the reversal point a guide extending upwardly from said inner shell toward said outer shell.

2. Apparatus in accordance with claim 1 wherein said guide is a pin.

3.. Apparatus comprising a rotatable member com prising an outer shell and an inner shell, said outer shell being provided with an endless slot through its surface, said slot containing at least two reversal sections; and at each reversal a guide extending radially between the said shells.

4. Apparatus in accordance with claim 3 wherein said guide is a pin.

5. Apparatus in accordance with claim 4 wherein the said pin has a diameter between and inch.

6. Apparatus in accordance with claim 4 wherein the said pin has a diameter between and /2 inch.

7. Apparatus in accordance with claim 3 wherein said guide is not more than /2 inch behind the edge of the reversal.

8. Apparatus in accordance with claim 3 wherein the said guide abuts the edge at the reversal.

9. Apparatus in accordance with claim 3 wherein the said guide is removed between 3 and inch from the edge of the reversal in the said outer shell.

10. Apparatus comprising a rotatable member comprising an outer shell and an inner shell, said outer shell being provided with an endless slot through its surface, said slot containing at least two reversal sections; at each reversal a guide extending radially between the said shells; and at each reversal a threading means comprising an extension of the said slot in the said outer shell through to the adjacent edge of the said outer shell.

11. Apparatus in accordance with claim 10 wherein said guide is a pin.

12. In a grooved roll for traversing yarn, an outer shell concentric with an inner surface for supporting the traversing yarn, said outer shell having an endless slot through its surface, which slot comprises at least two reversal sections and helical sections between said reversal sections; and a thread guide at each reversal section extending radially from the inner surface substantially to the outer shell.

13.-Apparatus in accordance with claim 12 wherein said slot at its reversal sections extends to the edge of the outer shell.

References Cited in the file of this patent UNITED STATES PATENTS 2,145,935 Kinsella Feb. 7, 1939 2,151,327 Moncriefi Mar. 21, 1939 2,550,086 Rouge Apr. 24, 1951 2,646,227 Calhoun July 21, 1953 FOREIGN PATENTS 663,451 Germany Aug. 6, 1938

Claims

12. IN A GROOVED ROLL FOR TRAVERSING YARN, AN OUTER SHELL CONCENTRIC WITH AN INNER SURFACE FOR SUPPORTING THE TRAVERSING YARN, SAID OUTER SHELL HAVING AN ENDLESS SLOT THROUGH ITS SURFACE, WHICH SLOT COMPRISES AT LEAST TWO REVERSAL SECTIONS AND HELICAL SECTIONS BETWEEN SAID REVERSAL SECTION; AND A THREAD GUIDE AT EACH REVERSAL SECTION EXTENDING RADIALLY FROM THE INNER SURFACE SUBSTANTIALLY TO THE OUTER SHELL.