US2814850A - Converging warp sheet - Google Patents

Description

Dec. 3,1957 J; T. RICH 2,814,850

CONVERGING wARP SHEET Filed May 17, 1955 ww 4 \IH/IHH!ILLM INVENT OR.

ATTORNEY 2,814,850 CONVERGMG WARP SHEET John T. Rich, Morristown, Tenn., assignor to American Enka Corporation, Enka, N. C., a corporation of Dela- Ware Application May 17, 1955, Serial No. 509,033 6 Claims. (Cl. 28-22) This invention relates to tube spinning and more particularly -to the formation of a warp from a plurality of freshly spun and aftertreated yarns.

In the tube spinning of rayon or other man-made yarns under commercial conditions, the tubes necessary to aftertreat a single yarn are arranged in a compact group and a large number of such groups are arranged in side by side relationship. The yarns discharged from all of these groups are arranged into a warp running at right angles to the tube groups and that warp is pulled under some tension to warp drying apparatus and collection.

One of the desirable features of tube spinning is that yarns, which are liquid propelled through the aftertreating tubes, are in relaxed condition during aftertreatment with the result that the liquid treatment is uniform and very effective. When, however, the yarn issuing from the last tube of a group becomes a part of a warp, some of the tension from the warp propelling medium is evident within the aftertreating tubes with resulting reduction in the uniformity and effectiveness of the aftertreatment. On the other hand, the warp handling of tube aftertreated yarns is desirable for reasons of drying ease, space economy and ease of spinning-in.

In application Serial Number 430,823, filed May 19, 1954, and commonly owned herewith there are shown schemes for preventing the tensions in the yarns running in the warp from migrating back into the treatment tubes. From the point of view of liquid treatment the arrangements of application Serial Number 430,823 are highly satisfactory. However there is the basic problem that tension is undesirable in the tubes but desirable in the warp. Accordingly, when the tensions in the tubes are at optimum, there has been some mechanical handling trouble with the warp such as sticking together of adjacent yarns, difliculty in spinning-in and low resistance of the warp to displacement of individual yarns by foam on the liquid used in treating the warp.

It is an object of the present invention to overcome the foregoing diiculty in a manner fully compatible with low yarn tensions during liquid aftertreatment in the tubes of the system.

It is proposed according to the present invention so to locate the yarns of the warp that their spacing is somewhat inversely proportional to the tension so that the components of the warp converge in the direction of increasing tension.

Other objects and advantages of this invention will be apparent upon consideration of the following detailed description of a preferred embodiment thereof in conjunction with the annexed drawing wherein:

Figure 1 is a view partially in elevation and partially in section of a tube group for the aftertreatment of rayon which constitutes a typical environment for the present invention; and

Figure 2 is a fragmentary View in top plan of a warp arrangement according to the present invention showing the components of the warp converging in the direction of draw ott.

Referring now in detail to Figure l, freshly spun yarn enters the tube group through tube 1t). ln transfer box 11, it is introduced into the first tube 12 of the aftertreating group. It is delivered by tube 12 to transfer box 13 in which it enters the next tube of the group. Succeeding portions of the yarn are thus liquid propelled hcc back and forth between boxes 11 land 13 until the particular aftertreatment is completed. The last tube of the group, tube 14, originates in box 11, but, instead of terminating in box 13, it discharges into a large conduit 15 which leads to a trough 16 into which the yarn and the liquid from tube 14 are discharged. The structure and operation thus far described are disclosed in application Serial Number 361,892, filed June 16, 1953, and cornmonly owned herewith.

A commercial tube spinning machine has many tube groups of the type shown in Figure 1, yand these are arranged side by side with longitudinal axes thereof in mutually parallel relationship. The trough 16, on the other hand, is common to all of the groups. When the yarns from all of the groups have been discharged into the trough 16, the operators arrange them in combs, such as at 17, to form a warp running downstream above the trough 16. This warp is drawn off by rollers 18, such as those shown in broken lines.

The tension on the warp running in the combs above the trough 16 has a tendency to be transmitted through the yarn at least somewhat into the aftertreating sysem. In the Figure l arrangement, the transmittal of the tension into the tube system is prevented by making a reverse S curve in the end of the last tube 14 of the system. This curvature of the tube 14 has a braking effect on the yarn so that it can run free of tension in the aftertreating tubes and yet be handled as an orderly warp.

Various other expedients for preventing migration of the tension emanating from draw-off rollers 18 back into the tube system are shown in application Serial Number 430,823, filed May 19, 1954.

In Figure 2 there is shown in plan an upstream portion of the warp trough 16. It can be seen that the tubes 15 are arranged -in groups of six and that a comb such as the comb 17 is arranged to serve the yarns from each group of tubes 15 as well as all of the yarns entering the warp upstream thereof.

These combs bear reference numerals 19, 20 and 21, in addition to the comb 17 which is depicted in the cross section which constitutes Figure 1. The left-hand end of Figure 2 represents the extreme upstream end of the warp formed from the output of a multi-position tube spinning machine. Between the upper end of the trough 16 and the first comb 19, there are six tubes 15 which discharge freshly spun yarn into the trough 16. These six yarns are oriented into a warp by the upwardly projecting pins or teeth 19a which define the comb 19. The comb 17 accommodates the six yarns issuing from the tubes 15 which lie between combs 19 and 17 and which are newly entering the warp as Well as the yarns which issued from the group of tubes upstream of the comb 19. The comb 20 similarly accommodates the yarns entering the warp between combs 17 and 20 as well as all of the yarns already in the warp upstream of the comb 17. This procedure continues for the full length of the trough 16. Consequently the final width of the warp is dependent upon the number of spinning positions with which the machine is equipped and the minimum yarn spacing at the downstream end of the trough 16.

If one compares the combs 19, 17, 20 and 21, it is immediately apparent that the defining teeth thereof are much more widely spaced in the case of upstream comb 19 than in the case of downstream comb 21. The upstream comb 19 has its teeth 19a so spaced as to distribute a warp comprised of only six yarns across the full width of the top of the trough 16. On the other hand, comb 17 has its teeth 17a so spaced as to distribute twelve yarns across the full width of the trough. It is, therefore, evident that the teeth 19a are twice as far apart as are the teeth 17a and that the teeth 17a are, in turn, a third further apart than are the teeth 20a on the comb 20. The teeth are progressively closer together in the combs closer to the downstream end of the trough, in each instance the number of teeth per comb being increased by six over the adjacent upstream comb.

lt has been found that if the yarns constituting the warp are widely spaced where the tension is lowest and are more closely spaced where the tension is higher, the overall tension can be reduced concurrently with a reduction in the tendency of adjacent component yarns of the warp to migrate toward one another to stick together or to cause other operating difliculties. In a warp arrangement involving combs having the same spacing for the whole length of the trough, tension has to be maintained at 225 grams to prevent excessive sticking. This is suliiciently high so that there is a serious tendency for tension to migrate back into the aftertreating tubes of the system. With the new arrangement of the present invention, involving wide spacing at the upstream end of the trough which is the furthest from the roller 18 and close spacing at the downstream end of the trough near the rollers 18, it is possible to reduce the tension to 125 grams with resulting improvement in fiber quality. This is evident when it is borne in mind that tension on the yarn during tube type aftertreating retards the opening up of the iilaments and the uniform contact thereof with the aftertreating liquid.

A further advantage of the present invention is that by using different spacing of the yarns as between the upstream and downstream ends of the trough, it is possible to use identical tubes for every yarn led into the trough. Thus, tubes 15 of equal length discharge their yarns into a trough which is of the same width for the full length of the machine.

What is claimed is:

l. In a machine for spinning man-made yarn, a first group of conduits arranged in mutually parallel relationship and through each conduit of which a yarn issues, a first guide means for forming from the yarns of said iirst group of conduits a warp of predetermined width and with a predetermined spacing between individual yarns, additional groups of conduits arranged in mutually parallel relationship with and adjacent to said iirst group and through each conduit of which yarn also issues, an additional guide means for each of said additional groups of conduits, said additional guide means being spaced fr oin said iirst guide means and from each other in the direction of travel of the warp, for forming from the yarns of each additional group of conduits a warp and for receiving the warp from the preceding guide means, the overall width of the warp formed by each of said additional guide means being substantially equal to said predetermined width of the warp formed by said first guide means whereby a combined warp of progressively lesser yarn spacing but uniform width is produced and means for drawing the combined warp from said groups of conduits.

2. In a tube machine for spinning man-made yarn, a first group of tubes arranged with the longitudinal axes thereof mutually parallel and through each tube of which a yarn issues, a rst guide means for forming from the yarns of said first group of tubes a warp of predetermined width and with a predetermined spacing between individual yarns, additional groups of tubes arranged in mutually parallel relationship with and adjacent to said irst group and through each tube of which a yarn also issues, an additional guide means for each of said additional groups of tubes, said additional guide means being spaced from said tirst guide means and from each other in the direction of travel of the warp, for forming from the yarns of each additional group of tubes a warp and for receiving the warp from the preceding guide means, the overall width of the warp formed by each of said additional guide means being substantially equal to said predetermined width of the warp formed by said rst guide means whereby a combined warp of progres,-

4 sively lesser yarn spacing but uniform width is produced and draw-off means arranged at one end of said groups of tubes to draw said combined warp in a direction generally normal to the longitudinal axes of said tubes.

3. in a machine for spinning man-made yarn, a first group of conduits arranged in mutually parallel relationship and through each conduit of which a yarn issues, a first guide comb having sparsely spaced teeth for forming a warp from the yarns of said first group, additional groups of conduits arranged in mutually parallel relationship with and adjacent to said rst group and through each conduit of which a yarn also issues, an additional guide comb for each of said additional groups of conduits, said additional guide combs being spaced from said first guide comb and from each other in the direction of travel of the Warp, each of said additional guide combs having more teeth which are spaced progressively closer than those of preceding combs for forming from the yarns of each group an additional warp and for receiving adjacent to said additional warp the Warp from the preceding guide comb, whereby a combined warp of progressively lesser yarn spacing is produced and means for drawing the combined warp from said groups of conduits.

4. In a tube machine for spinning man-made yarn, a first group of tubes arranged with the longitudinal axes thereof mutually parallel and through each tube of which a yarn issues, a first guide comb having sparsely spaced teeth for forming a warp from the yarns of said iirst group, additional groups of tubes arranged in mutually parallel relationship with and adjacent to said tirst group and through each tube of which a yarn also issues, an additional guide comb for each of said additional groups of tubes, said additional guide combs being spaced from said iirst guide comb and from each other in the direction of travel of the warp, each of said additional guide combs having more teeth which are spaced progressively closer than those of preceding combs for forming from the yarns of each group an additional warp and for receiving adjacent to said additional warp the warp from the preceding guide comb, whereby a combined warp of progressively lesser yarn spacing is produced and draw-oil means arranged at one end of said group of tubes to draw said combined warp in a direction generally normal to the longitudinal axes of said tubes.

5. The method of warping comprising the steps of guiding a iii-st group of running yarns to form a rst warp of widely spaced individual yarns, progressively guiding the individual yarns more closely one adjacent the other as the first warp proceeds in a linear direction and progressively introducing additional groups of yarns to adjacent sections of the first warp to form a combined warp characterized in that, as additional groups of yarns are progressively introduced to the iirst warp, the spacing between individual yarns in the combined warp is proportionately reduced.

6. The method of warping comprising the steps of guiding a first group of running yarns to form a first warp of predetermined width and of widely spaced individual yarns, progressively guiding the individual yarns more closely one adjacent the other as the iirst warp proceeds in a linear direction and progressively introducing additional groups of yarns to adjacent sections of said iirst warp to form a combined warp characterized in that, as additional groups of yarns are progressively introduced to the iirst warp, the spacing between individual yarns in the combined warp is proportionately reduced to maintain constant said predetermined width.

References Cited in the file of this patent UNITED STATES PATENTS 2,116,766 Phillips May l0, 1938 2,185,621 Balch et al. Jan. 2, 1940 2,587,619 Hofmann Mar. 4, 1952 2,615,655 Guild Oct. 28, 1952 2,619,677 Ryan Dec. 2, 1952

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