RU2061131C1 - Method of making of overhanding stitch - Google Patents

Abstract

FIELD: sewing industry, in particular, making of overhanding stitches. SUBSTANCE: method of making of overhanding stitch with the aid of a needle, upper and lower loopers consists in multiple piercing of material with a needle and passing of needle loop through it, formation of a loop-lap, and passing of the lower loop thread through it, transfer of the thread with the looper through the material edge onto its top by the stitch value, throwing-off of threads from the working members and tightening of stitches. At piercing of material the needle with needle thread is passed through the gap between the previous needle loop located in the looper, and the looper thread running through the material edge, and at stitch tightening the newly formed needle loop is bent with the lower looper thread, and the first thread is moved to the point of piercing by the loop of the which the thread of the lower looper additionally winds round the needle loop. EFFECT: enhanced quality of stitch due to its higher resistance to uneaveling. 9 dwg

Description

 The invention relates to the clothing industry, in particular to methods for producing overcasting chain stitch.

 A known method of forming an overcasting chain stitch using a needle and two loopers [1] includes repeatedly piercing the material with a needle and passing a needle thread loop through it, forming a needle thread inlet loop, passing the lower looper thread through the inlet loop, transferring the thread to the upper looper over the edge of the material to its top, moving the material by the size of the stitch, securing the loop transferred by the upper looper, dropping the threads from the working bodies and tightening the stitches.

 This method of forming edge-wrapping seams leads to the formation of not strong enough stitches, characterized by easy dissolving. In addition, this line is also characterized by uneven covering of the edge of the material.

 The aim of the invention is to increase the strength and greater indissolubility of the stitch by reliable fastening of the thread, achieving a more uniform covering of the edges of the material, as well as obtaining new types of overcasting stitches.

 This goal is achieved due to the fact that when making an overcasting seam with a needle, the upper and lower loopers by repeatedly piercing the material with a needle and passing through it a needle thread loop, forming a needle thread inlet loop, passing the lower looper thread through the inlet loop, transferring threads with the upper looper over the edge of the material to its top, moving the material by the size of the stitch, securing the loop transferred by the upper looper, dropping the threads from the working bodies and tightening the stitches, after calcining Bani material newly formed by the needle thread loop is carried between the previous loop of needle thread, located at the lower looper and the needle thread portion between the lower looper thread loop attached to the top of the base material and its exit from the looper eyelet. When the stitch is tightened with the thread of the lower looper, the newly formed loop of the needle thread is bent around and dragged by the previous thread loop of the needle thread to the puncture site.

 Due to the additional rounding of the loop of the needle thread with the thread of the lower looper and pulling it to the place of the previous puncture, the needle thread is double wrapped with the thread of the lower looper, which makes the resulting stitch more durable to dissolve. In addition, in some cases of skipped stitches, the pattern does not open, because In this place, a regular chain stitch is formed.

 In FIG. 1-7 shows the process of forming a double thread overcasting stitch of the proposed method; on Fig and 9 overcast double-stitch stitches obtained as a result of this method.

 The needle 1 (Fig. 1), punctured the material 2 and passing the needle thread 3 through it, rises from the lowermost position upwards, an inlet loop 5 is formed above its eye 4. The lower looper 6 with the thread enters the gap between the needle thread and the needle body 7, which, moving from left to right, introduces a loop of thread 7 into the inlet loop 5. The lower looper 6 (FIG. 2) leads the thread 7 to the line of movement of the upper looper 8, which captures the thread 7, while the latter deviates to the side along arrow A opposite to the direction of transportation of the material. The upper looper 8 (figure 3) carries the thread 7 through the edge of the material 2 from the bottom up, while the thread 7 with two branches goes around the edge of the material. Needle 1 is in its highest position, material 2 moves along arrow B by the amount of stitch, and the lower looper 6 moves from right to left. The needle 1 (Fig. 4) drops and, piercing the material 2, stabs the thread 7, transferred by the upper looper 8 to the top of the material, the lower looper 6 continues to move to the left, while the previous loop 10 of the needle thread 3 is located on the lower looper 6. The needle 1 (Fig. 5), punctured the material 2, continues to move downward, drawing a new loop 11 of the needle thread 3 in the gap between the previous loop 10 located on the lower looper and the portion of the lower looper thread between the point of its pinning at the top of the material and the eye of the lower looper 12 The lower looper 6 (Fig.6 ), continuing to move to the left, discards the loop 10 of the needle thread of the previous stitch. Then this loop is pulled to the place of the previous puncture 13, while the thread of the lower looper 7, which bends around the needle 1 with the loop 11 of the needle thread, is also pulled there. The needle 1 (Fig.7) again moves up, forming the next loop-inlet 14 of the needle thread 3, into which the lower looper 6 introduces the thread 7.

 As a result of the implementation of the above method, a stitch is obtained that is different from the known stitch of class 502 GOST 12807-88.

 The stitch consists of a needle thread 3 (Fig. 8), passing on the surface of the material and held by a loop 15 at the puncture site on the wrong side, and the looper thread 6, which enters the loop of the needle thread under the material, thrown from the bottom up through the edge of the material enveloping the next loop 16 needle thread on the surface of the material, again thrown from top to bottom over the edge of the material, enveloping also the loop of the needle thread under the material and included in the first loop 2 of the needle thread.

 Figure 9 shows the overcasting seam obtained by the proposed method by reducing the tension of the needle thread 3 and increasing the tension of the thread of the lower looper 6. This seam is characterized in that the loops 15 and 16 of the needle thread are pulled from the bottom of the material to its edge.

 In class 502 stitch, obtained by the prototype method, the needle thread loops under the material are pulled together with one thread of the lower looper, and the edge is stitched with two parallel threads located next to each other so that gaps between the threads are obtained on the surface of the material, under it and at the end.

 In the stitch obtained by the proposed method, the loops of the needle thread are pulled together under the material by two threads, the second thread covering both branches of the loop of the needle thread. This makes the seam more stable, since dissolving it is much more difficult. In addition, the presence of two tightening threads makes the seam more elastic, similar to how a two-thread single-line straight chain stitch (class 401) is more elastic and less open than a single-thread single-line straight chain stitch (class 101).

 Marking the edge of the material in the resulting stitch is distinguished by the best cover, since here the threads are not parallel, as in the class 502 stitch, but are located both on the surface and on the inside and at the end at an angle to each other, forming together with the needle thread on the surface and with tightening branches of the looper thread on the wrong side of the triangles, since the looper thread, leaving one loop of the needle thread, returns to it only after rounding the next loop. Similarly, on the end side of the overcast edge, the vertical branches of the lower looper thread are more evenly spaced.

 The resulting stitch has another significant advantage. Chain stitches may open if the stitch is skipped. When stitching with the proposed method, skips when the upper looper enters the gap between the lower looper and its thread, and also when the needle enters the gap between the upper looper and the thread brought by it, do not open the stitch, in this place instead of the overcast stitch, a two-thread single-line straight chain is formed class 401 stitch. This slightly distorts the appearance of the overcasting stitch at this point, but does not lead to blooming.

 All the advantages also apply to the three-sided edge wrapping seam, during which the upper looper transfers to the material surface not the lower looper thread, but its own thread. The stitch resulting from this also differs from the well-known three-thread overcast overcast stitch of class 504. From the two-thread stitch, it differs in that the top stitch is carried out by the thread of the upper looper.

 The proposed method covers other classes of overcasting stitches.

Claims (1)

 A method of obtaining an overcasting seam by repeatedly piercing the needle and passing through it a loop of needle thread, forming a loop-inlet of a needle thread, passing a loop of a lower looper through a loop-inlet of a needle thread, in which a loop of a needle thread is placed on a looper, transferring the thread of the lower looper through the edge of the material on its surface with the formation of a triangle of thread under the material, consisting of the previous loop of the needle thread placed on the looper, the thread of the lower looper and the portion transferred through to loop of the looper thread material, movement of the material by the size of the stitch, fixing the loop transferred over the edge of the thread material by a needle, dropping the thread from the working bodies and tightening the stitches, characterized in that after piercing the material, the next loop of the needle thread is carried out into the thread triangle formed under the material, when tightening the stitch, they loop around the needle thread loop with the thread of the lower looper and drag it with the previous needle loop that is tightened to the place of the previous puncture under the material.

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