JPH0367950B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new type of splice for textile yarns or any other yarns.

Splices made between textile yarns using fishermen's knots, weaver's knots or other types of knots are known.

Splices between yarns made with adhesives or with knots by wrapping yarn or external tape are also known.

Splices are also known which are made by twisting and entangling the fibers of two threads together with air blowing or using an electrostatic field.

These known splices have drawbacks with respect to the mechanical properties, the usability of the spliced yarn in its downstream equipment, and the general nature of the seam.

Splices are also known which are made by untwisting individual yarns, pulling them together, and then retwisting the end portions of the yarns to be spliced together.

The characteristic of this seam is that before pulling the threads together, the fibers are made almost parallel, and the two
It consists in pulling the threads of a book together and then twisting them together.

These splices have unsatisfactory mechanical properties because the fibers of the original yarn cooperate with each other only to a limited degree and in an inappropriate manner.

This results in insufficient strength, inadequate splice regeneration, incomplete end areas, and unsatisfactory splice strength over time.

Attempts have also been made to improve splicing by unwinding the fibers and ruffling them when they are substantially parallel. This has been done using mechanical and/or pneumatic means, but no appreciable or satisfactory results have been obtained.

For example, known splices made with air jets bind the fibers together into a mat.

Furthermore, the spliced area becomes hard due to this,
The resulting loss of elasticity causes considerable problems in downstream processing, particularly in the dyeing and warp processes as well as other processing steps.

The object of the present invention is to provide a yarn for textiles or any other yarn, which has not only good aesthetic characteristics, but also important mechanical, engineering and elastic properties and a long service life. The purpose is to provide a joint.

Furthermore, it is an object of the invention to provide a splice that is not only homogeneous, but also suitably adapted to the requirements of the various downstream processes used.

In fact, the splicing section of the invention can be adapted respectively to the downstream use by consisting of longitudinal sections in the central region and in the transition region of the type and form chosen as desired.

The splice has a single yarn end obtained by tearing or tearing or cutting. The ends of the single threads are therefore themselves subjected to shearing forces, or are cut off, or are tapered in diameter.

Further, since a mutual centripetal pressing force is generated in one yarn with respect to the other yarn, the splicing portion includes a component of the yarn that tends to shrink in the length direction.

According to the invention, the various types of splices have diameters that vary from 0.8 to 1.8 times the diameter of the single yarn.

Further, the spliced portion can be made of a spiral single yarn having a desired shape and an inclination with respect to the axis of the spliced portion. This slope may be constant, variable, or a mixture thereof, as desired and depending on the properties required.

The inclination of the helical single thread relative to the axis of the splice may begin in the central region of the splice and vary towards its terminal regions.

This can meet possible requirements of elasticity and/or strength that differ outwardly from the central region to the end regions of the splice, depending on the requirements of the subsequent means used.

According to the invention, the yarn splice made in this way is itself very stable, so that the end of the yarn or a part thereof can be left as a substantially free end.

According to the invention, it is also advantageous to wrap the ends of the remaining single yarns around the spliced single yarns.

It is also possible that at least a portion of the splice includes intertwined fibers.

Therefore, the present invention mechanically untwists the yarn end portions of two single yarns in advance, aligns the untwisted yarn end portions of the two single yarns, and then mechanically retwists the yarn ends. The number of twists of the spliced yarn in at least one region of the spliced region is greater than the number of twists of the single yarn in the same region, and The mutual centripetal pressing force caused by the contraction of each of the single yarns that occurs is realized by the splicing section, which is characterized in that it acts between the two single yarns at the splicing section.

The invention will now be described with reference to the accompanying drawings, which are given by way of example only.

FIG. 1 shows a splicing section according to the invention.

FIG. 2a shows a first modification of the splicing section of FIG.

FIG. 2b shows another modification of the splicing section of FIG.

FIG. 3 shows two states of spliced yarn, respectively.

Figure 4 shows the binding effect of loosened fibers.

FIG. 5 shows a modification of the splicing section of FIG. 1 with the free end cut or torn.

FIG. 6 shows a variation of the splicing section of FIG. 1 with a completely wrapped single yarn end that has been cut or torn.

Figures 7 and 8 show two possible arrangements of single yarns in the splicing section.

Identical parts having the same function are provided with the same reference numerals in the drawings.

Splice section 22 of FIG. 5 with free ends 120 and/or 121 of single yarn (cut or torn or open as illustrated)
is sufficiently stable and can be used without worrying about subsequent steps.

If the step of winding the ends 120 and/or 121 of the single yarns around the single yarns 21 and 20, respectively, is performed, an even stronger yarn seam can be obtained.

This winding of the ends 120 and 121 of the single yarns is accomplished using the same equipment that is used to create the splice 22, or by any other suitable means.

In the splicing part of the present invention, the loosened fibers 24
The end points 124 (FIG. 4) can be entwined with other fibers, so that between two respective single yarns or between coils of the same single yarn, the fibers The yarn enters the intervening coil, and the individual single yarns 20, 21 are well intertwined and twisted together.

This entanglement is further improved by providing the loosened fibers 24 with a suitable orientation.

This orientation is advantageously, but need not necessarily be, from the central region of the splice 22 towards the end region 23 .

If there is an end region of the single yarn with progressively less twist (Figures 1, 2 and 4), the end 12 of the single yarn
0,121 are advantageously wound tightly around the other single threads 21 and 22, respectively, so that the last coil wound is on the surface 2 of the single thread on which it is wound.
It comes to be protected by the raised part 5.

FIG. 4 shows this for teaching purposes, along with the bonds created by the unraveled fibers 24. In FIG. 4, the surface 25 of the coil of the single yarn 21 is deeply ridged by the coil at the end 120 of the single yarn, so that the coil at the end 120 of the single yarn 21
It is contained inside the outer end 25 of 1.

According to the invention, different types of splices with different properties are possible. Figures 1, 2, 7 and 8 show several types of splices.

The splicing section of FIG. 1 was made without densification and compression steps. Furthermore, the end 120 of the single yarn,
121 is gradually tapered, and the end region of the spliced portion is wound successively on the intertwined single yarns 21 and 20.

In such conditions, the splice 22 has three regions: a central region 26 where the condition of the coil is almost constant, a transition region 27 where the coil changes its slope with a decrease in the diameter of the splice; It consists essentially of an end region 23 for joining the ends of single threads, the slope of which changes more sharply than in region 26. In this type of splice, the maximum diameter of the central region 26 is 1.25 to 1.8 of the diameter of the single yarn.
It changes by a factor of two. The maximum diameter of the end region 23 of the splice varies by 0.8 to 1.1 times the diameter of the single yarn.

The splicing section of FIG. 2 shows the effect of compaction and densification that takes place during its production.

In the case of FIG. 2a (intentionally not showing the unraveled fibers 24 for clarity of the example), there are still three regions, but the central region 26 is proportionally longer in length. This kind of splicing part is in the central area 2
At 6 it can have a maximum diameter of about 1.05 to 1.25 times the single thread diameter, while in the terminal region 23 the diameter is 0.8 to 1.25 times the single thread diameter.

Instead, Figure 2b shows the case where the end portion of the single yarn is approximately the same length as the splice (here, as an example, the case of fibers spread evenly in the end area of the single yarn is shown). ).

In such a case, the splice 22 still has a transition region 27, but the central region 26 is substantially absent, whereas the transition region 27 actually overlaps the end region 2.
It also covers 3.

It can be seen from the drawings that in such a case the splices are in fact formed progressively relative to each other in both directions.

This type of splicing part is 0.8 to 0.8 of the average diameter of single yarn.
1.10 times the diameter, within which the diameter can vary substantially along the axis of the splice.

By changing the length of the end portion of the single yarn and changing the process conditions for creating the spliced portion, it is possible to create a combination of the spliced portion shown in Figure 2a and the spliced portion shown in Figure 2b, or a combination of these two types of spliced portions. It is also possible to obtain different splices, which may be a combination of the splices of FIG.

Figure 3 shows the spliced part (center area 26) made.
The two final states of the single yarn are shown in FIG. The two single yarns 20 and 21 are in contact with each other over a certain width. This splicing part consists of a part subjected to compression and densification (position B) and a part not subjected to these auxiliary effects (position A).

FIG. 3 shows the bonding effect created by the auxiliary compression and densification action which widens the band for support and mutual cooperation between the two single threads 20, 21.

7 and 8 are examples of two further types of splices with different properties that can be made to the splices of FIGS. 1 and 2a.

Although the ends 120, 121 of the single yarn are shown,
This is not a special case, just an example.

In FIG. 7, as the coil changes position from the central region to the distal region of the splice, it tends to become progressively more perpendicular to the single yarn axis.

On the other hand, in Figure 8, the coil exhibits an inclination near the central region of the splice, nearly perpendicular to the axis of the splice, and then gradually changes until the coil reaches the distal region of the splice with a noticeable slope. do.

Although the invention has been described by way of example of preferred solutions, variations, combinations and combinations thereof, including the use of mechanical equivalents, may be implemented by those skilled in the art. This also does not depart from the scope of the idea of the solution of the invention.

Index A Yarn that is not compressed or densified B Compressed or densified yarn 20 Single yarn 120 End of single yarn 220 Single yarn at spliced portion 21 Single yarn 121 End of single yarn 221 Single yarn at spliced portion 22 splicing section 23 end region of splicing section 24 loosened fibers 124 loose ends of fibers 26 central region of splicing section 27 transition region of splicing section Prior art U.S. patent by Abbott Machine Co.
No. 2515172 U.S. Patent No. 2515172 by Plymouth Cordage Co.
No. 3307339 U.S. Patent No. 3379002 to Spunize Company of America Inc. U.S. Patent No. 3633352 to T. E. Marriner U.S. Patent No. 4240247 to Murata Machinery Co., Ltd.
GB No. 661697 by Abbott Machine Co.
BE No. 889501 by Zellweger Uster SA BE No. 889502 by Zellweger Uster SA BE No. 889503 by Zellweger Uster SA

[Brief explanation of drawings]

FIG. 1 shows a splicing section according to the invention. Second
Figure a shows a first modification of the splicing section of Figure 1.
FIG. 2b shows another modification of the splicing section of FIG. FIG. 3 shows two states of spliced yarn, respectively. Figure 4 shows the binding effect of loosened fibers. FIG. 5 shows a modification of the splicing section of FIG. 1 with a free single yarn end that has been cut or torn. FIG. 6 shows a variation of the splicing of FIG. 1 with a completely wrapped single yarn end that has been cut or torn. Figures 7 and 8 show two possible arrangements of single yarns in the splicing section.

Claims (1)

[Claims] 1. The yarn end portions of two single yarns are mechanically untwisted in advance, the untwisted yarn end portions of the two single yarns are aligned, and then the yarn is mechanically re-twisted. A spliced portion obtained by A splicing section characterized in that at least one region of the splicing section is made of a coiled single yarn having an inclination that changes with respect to the axis of the splicing section. 2. The first aspect of the present invention is characterized in that a region of the spliced portion is made of a coiled single yarn having a substantially constant inclination with respect to the axis of the spliced portion.
The splicing part described in section. 3. At least one region of the spliced portion made of a coiled single yarn having a slope that changes with respect to the axis of the spliced portion is located between a central region and an end region of the spliced portion. A splicing section according to claim 1. 4. The yarn splicing section according to claim 1, wherein the entire yarn splicing section is made of a coiled single yarn having an inclination that changes with respect to the axis of the yarn splicing section. 5. At least one region of the spliced portion made of a coiled single yarn having a varying inclination with respect to the axis of the spliced portion is symmetrical with respect to a central region of the spliced portion. Range 1
The splicing part described in section. 6. The yarn splicing section according to any one of claims 1 to 5, characterized in that the ends of the single yarns are free. 7. The yarn splicing section according to any one of claims 1 to 5, wherein the end of the single yarn is wound around the other spliced single yarn. 8. Any one of claims 1 to 7, characterized in that the ends of the single yarns are cut off.
The splicing part described in section. 9. Claims 1 to 7, characterized in that the single yarn gradually becomes thinner toward the end.
The splicing part described in section. 10 Claims characterized in that the single yarn in the end region of the spliced portion is tightly wound around the other spliced single yarn so as to form a trough in the other spliced single yarn. The splicing section according to item 9. 11. The splicing section according to any one of claims 1 to 10, wherein the maximum diameter of the central region of the splicing section is 1.25 to 1.8 times the diameter of the single yarn. . 12. The splicing section according to any one of claims 1 to 11, wherein the diameter of the end region of the splicing section is 0.8 to 1.25 times the diameter of the single yarn. 13. The splicing section according to claims 1 to 10, wherein the maximum diameter of the central region of the splicing section is 1.05 to 1.25 times the diameter of the single yarn. 14. Any one of claims 1 to 10, characterized in that the maximum diameter of the region between the central region and the end region of the splicing portion is 0.8 to 1.1 times the diameter of the single yarn. The yarn splicing section according to item 1. 15. Claims 1 to 1, characterized in that most of the unraveled fibers of the single yarn are oriented toward the end region of the splicing section and are entangled with the fibers of the single yarn. The yarn splicing portion according to item 14.