Different fabric jumper handling skills

Down fabric plus vacuum cotton and down stitches form a special thick layer of O.7-1.1cm. In this state, the needle and the sewing thread do not easily form a good loop, which leads to skipping. According to this special thick layer, first solve the feeding problem and replace the feed dog with a thick feed dog.

The needle hole of the needle plate should be larger and the feeding cam should be adjusted accordingly. Adjustment standard: the tooth is at the highest position, the needle point of the needle should be inside the pin hole of the needle plate: the height of the needle bar must also be greatly adjusted, the needle bar The height should be at the bottom dead center of the needle bar, and then down to the third line of the needle bar scale, the next O.1cm should be used. Using the principle of increasing the stroke of the needle bar to complete the hooking line, the timing of the needle and hooking line also changes. When the needle bar rises from the lower dead point to the first line of the scale, the angle is adjusted. The value of the angle adjustment is consistent with the above; increasing the pressure of the presser foot: due to the thick material, the needle is easy to generate friction and heat, which may make it difficult to make the wire ring. Formation, if necessary, to solve the problem by adding silicone oil at the line.

Second, the processing method of the jump stitches appearing on the two layers of fabrics in the real silk before sewing and sand washing

Before the silk fabric was washed without sand, the fabric was very astringent and hard in the sewing process. As a result, the needle and the sewing thread could not produce a good loop in the sewing material, and a jumper was formed.

Check whether the needle bar is worn with clearance: check whether the hook tip is good and standard, because the hook tip is a key component of the hook line, do not have burrs, baldness and other defects, if found, should be timely use of diamond or oil stone gold Phase sandpaper grinding to achieve the standard, and then adjust the angle; check the needle bar height, needle bar height standard: the needle bar at the bottom dead point, the needle bar scale line should be on the second line. In this way, when the needle bar is raised to the first line, the angle between the needle and the hook tip is optimized.

The adjustment angle should first be noted: If the needle bar has a slight gap, it is necessary to use the left hand to push the needle bar slightly to the left, and then adjust. Adjust the angle between the needle and the rotary hook as follows: When the needle rod rises from the bottom dead point to the first tick mark, the hook tip should be 1.1-1.5cm above the needle hole, and the hook tip and the needle lateral gap O.02-0.05cm; feeding mechanism is also the key, first check whether the delivery cam is standard; good, because the sewing thin material, the teeth should be lower, should be properly adjusted feed cam.

Third, sewing silk after washing the real silk in the high and low stitching stitches

The real silk fabrics after sand washing are soft, so the thread loops are difficult to form when the needles and sutures pass through the sewing material. However, at the level where the fabrics and the bottom edges meet, the gaps between the fabrics and the bottom edge are even more likely to result in gaps below the pressure foot at the height and the bottom. A loop is formed and a needle jump phenomenon occurs.

At this point, check the needle bar for clearance; check the hook tip for sting and baldness: check the needle bar height. Because it is a high and low layer, it can belong to medium thick material type. When making repairs, think calmly and then proceed to make appropriate adjustments to the height of the needle bar. According to this type of situation, adjust the height of the needle bar to adjust the needle bar to the third line of the lower dead point as a benchmark. The specific adjustment method is The adjustment angle should be adjusted when the third line of the scale rises to the first line: Check whether the needle hole of the needle plate is standard: If the presser foot uses the presser foot of the medium-speed flat sewing machine, the rear of the pressure foot should be worn off. When the cloth is formed, the presser foot and the upper and lower layers of the sewing material smoothly press down on the sewing material.

Fourth, bad stitching when producing leather stitching

When the leather is sewn, the fabric is astringent and leads to poor feeding. According to the above special thick materials to repair, but there are differences in the solution to feed problems, the use of nylon presser foot to handle poor feeding, but also can be used on leather selvage with silicone oil method to deal with.

5. When the denim is sewn, the broken line, rolling line, and jumper

The thicker sewn denim sewing thread, resulting in the formation of the wire loop is difficult, and the thick line can not be taken off the loop from the hook positioning loop hook broken line, rolling line, jumper. In addition to the above-mentioned thick material type repair methods, there are differences in this regard, due to the main use of thick lines, so that during the repair but also to the rotary hook positioning hook grinding, so that the thick line from the positioning hooks readily . And it's best to choose a hook that doesn't wear too much.