RU205161U1 - DEVICE FOR FORMING DOUBLE-LINE DOUBLE-LINE CHAIN STITCH - Google Patents

Abstract

The utility model relates to the garment industry, in particular to two-strand two-line chain stitches, and can be used when sewing knitwear, is aimed at expanding the arsenal of easy-to-use tools aimed at obtaining a two-strand two-line chain stitch of high quality and high reliability of the resulting seam. The device for the formation of a two-thread two-line chain stitch consists of a body on which a needle mechanism is installed, containing the left 1 and right 3 needles installed on a line perpendicular to the line of movement of the material 5, and the looper mechanism - the left 6 and right 7 loopers, located parallel to each other and horizontally across the stitch with the ability to rotate around its axis by 90 °, while the left looper is located behind the left needle, and the right looper is located in front of the right needle, at the end of each of the loopers there is a spreader 8 and 9 in the form of a fork 10 and 11 for the passage needles, and nozzles 12 and 13 are made on the arms of the fork for removing the loop-overflow from the needle and the groove 14 and 15 for guiding the thread when the loops 16 and 17 are formed.

Description

The utility model relates to the garment industry, in particular to double-strand double-line chain stitches, and can be used when sewing knitwear.

Known household overcasting sewing machine, taken as a prototype in terms of the device (copyright certificate SU No. 1406256 from 06/30/1988, bul. 24). The sewing machine has a stitching device including a needle mechanism, a looper mechanism, a material clamping mechanism, a knife mechanism, a mechanism for moving the material with a rail, a mechanism for adjusting the stitch length with a control handle. The connection of the connecting rod to the rocker arm is made by means of a ball joint, while the end part of the rocker arm has a cylindrical shape. A toothed rack is installed on the rocker. The rocker arm is mounted on an eccentric axis connected to the control handle by means of a toothed clutch.

The following set of prototype features coincides with the essential features of a utility model: mechanism needles and looper mechanism.

The disadvantages of the machine are the complexity of the design, which consists in the presence of an unnecessarily large number of parts, which complicates the operation of the sewing machine.

The utility model is aimed at expanding the arsenal of easy-to-use tools aimed at obtaining a two-strand two-line chain stitch of high quality and high reliability of the resulting seam.

This is achieved by the fact that the device for forming a two-thread two-line chain stitching consists of a body on which a needle mechanism and a looper mechanism are installed. In the proposed solution, the needle mechanism contains left and right needles installed on a line perpendicular to the line of material movement, and the looper mechanism contains left and right loopers located parallel to each other and horizontally across the stitch with the ability to rotate around its axis by 90 °, while the left the looper is located behind the left needle, and the right looper is located in front of the right needle, at the end of each of the loopers there is a fork-shaped spreader for the needle to pass through, and on the arms of the fork there are nozzles for removing the loop-overflow from the needle and a groove for guiding the thread when forming loops ...

The essence of the claimed utility model is illustrated by drawings, where figure 1 shows a two-strand two-line chain stitch, Fig. 2 - converging loopers at the time of removing the loop-overflow from the needle (scale 2: 1), Fig. 3 - diverging loopers, turning around their axis at an angle of 90 ° clockwise (scale 2: 1), the left looper shows the groove design for the direction of the thread (section A-A in Fig. 2), Fig. 4 - the entrance of the loopers into the loop-overlaps of the needle threads, Fig. 5 - obtaining a loop between the needle puncture in the material and the spreader, Fig. 6 - the formation of the lower stitch loops, Fig. 7 - the formation of the upper stitch threads, Fig. 8 - removing the loop of the threads from the grooves of the spreaders and leaving them put on the needles, as well as the formed two-thread two-line chain stitch, Fig. 9 - the passage of the threads through the looper spreaders during the formation of loops (scale 2: one).

The device consists of a body (not shown in the figure), on which a needle mechanism is installed, which contains a left needle 1 with a thread 2 and a right needle 3 with a thread 4, installed on a line perpendicular to the line of movement of the material 5. The formation of a stitch pattern is carried out by parallel needles 1 and 3 together with their respective left 6 and right 7 loopers forming the looper mechanism. Loopers 6 and 7 are located parallel to each other and horizontally across the line with the ability to rotate around its axis by 90 °. The left looper 6 is located and moves behind the left needle 1, and the right looper 7, parallel to it, moves in front of the right needle 3. At the end of each of the loopers 6 and 7 there is a spreader 8 and 9, respectively, in the form of a fork 10 and 11 for the passage of the needle 3 and 1. On the arms of the fork 10 and 11, spouts 12 and 13 are made for removing the loop-overlap from the needles 3 and 1 and the grooves 14 and 15 for guiding the thread 2 and 4 during the formation of loops 16 and 17.

The formation of a two-strand two-line chain stitching (Fig. 1) is carried out on the device proposed above by repeatedly piercing the material with a needle and passing the thread through it with the formation of a loop-overflow. Descending, parallel needles 1 and 3 with threads 2 and 4 pierce the stitched material 5.

When the body, in which the needle mechanism is installed, consisting of two parallel needles 1 and 3, threads 2 and 4 are formed above their ears, into which the noses 12 and 13 of two converging horizontal loopers 6 and 7 enter. and 4 are placed in the grooves 14 and 15 of the forks 10 and 11 of the spreaders 8 and 9 (Fig. 2, Fig. 3, Fig. 4). After the needles 3 and 1 come out of the material 5, the loopers 6 and 7 continue to move towards each other. In this movement, loops 16 and 17 are formed between the puncture of the needles 3 and 1 in the material 5 and the forks 10 and 11 (Fig. 5). When the spreaders 8 and 9 take the position opposite the needles 3 and 1, the loopers 6 and 7 rotate around their axis at an angle of 90 ° counterclockwise around the direction of their movement, substituting the forks 10 and 11 with threads 2 and 4 of the loops 16 and 17 opposite the opposite needles 3 and 1 (Fig. 3, Fig. 5). The material 5 moves a predetermined stitch length to the place of a new puncture of the material 5 in the direction indicated by the arrow and forms intersecting loops 16 and 17 from the bottom of the material 5 (Fig. 6, Fig. 9). The needles 1 and 3, moving down and puncturing the material 5, form the upper stitch threads and tighten it, and then enter the forks 11 and 10 with loops 17 and 16 (Fig. 7). After that, loopers 6 and 7 begin to diverge, turning around their axis at an angle of 90 ° clockwise, leaving loops 16 and 17 put on needles 3 and 1 with threads 4 and 2 (Fig. 8). Thus, a double-thread double-line chain stitch is formed (Fig. 8). Further, the process of forming stitches is repeated and a two-strand two-line chain stitch is formed.

Loopers 6 and 7 interact only with threads 2 and 4 and do not have their own threads, thereby reducing the consumption of threads and simplifying the proposed utility model, which increases the strength, elasticity of the stitching and reduces its opening.

In the stitch, the threads are pulled together under the fabric with two criss-cross loops. This makes the seam more stable, since it is much more difficult to open it. In addition, the presence of two tightening loops makes the seam more elastic. Multi-thread chain stitches have increased elongation, so they are widely used in the manufacture of knitwear. Also, the advantages include strength; less loosening in comparison with a single-thread chain stitch; low consumption and fewer thread refills; less loss of strength of the threads due to low loads on them; a simpler machine design. Thus, the utility model is aimed at expanding the arsenal of easy-to-use tools aimed at obtaining a two-strand two-line chain stitch of high quality and high reliability of the resulting seam.

Claims (1)

A device for forming a two-thread, two-line chain stitch, consisting of a body on which a needle mechanism and a looper mechanism are installed, characterized in that the needle mechanism contains left and right needles installed on a line perpendicular to the line of movement of the material, and the looper mechanism contains left and right loopers located parallel to each other and horizontally across the stitches with the ability to rotate around their axis by 90 °, while the left looper is located behind the left needle, and the right looper is located in front of the right needle, at the end of each of the loopers there is a fork-shaped spreader for the needle passage , and on the arms of the fork there are spouts for removing the loop-overlap from the needle and a groove for guiding the thread when the loops are formed.

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