Handling Skills Of Needle Jumping For Different Fabrics

First, the processing method of sewing down down fabric and sewing needle at the extra thick place.

The extra thick fabric of O.7-1.1 cm is made of down fabric and vacuum cotton and down stitch. Under this condition, the needle and suture are not easy to form a good thread loop, which leads to the needle jumping.

According to this special thick layer, the feeding problem is solved first, and the delivery tooth is changed into a thick cloth feeding tooth.

When the tooth reaches the highest point, the needle tip of the needle should be adjusted in the pinhole of the needle plate. The needle bar height should be adjusted greatly. The needle bar height should be lowered to the needle bar at the lower dead point, then the needle bar should be calibrated third lines, and then the O.1 cm should be used to complete the hook line. The needle and hook time will also change. The needle bar rises from the bottom dead point to the first line of the scale, adjusting the angle and adjusting the value of the angle and the same as above; increasing the pressure of the presser foot: because of the thick material, the needle is easy to generate frictional fever, and it may also make the wire ring difficult to form. If necessary, it is necessary to use silicone oil in the way of crossing the line to solve it. The needle holes of the needle plate should be larger, and the delivery cam should be adjusted accordingly.

Two. The way to handle the stitching of the real silk before sewing the two layers of fabric.

Before sand washing, fabric sewing is very astringent and hard, so that the needle and suture can not generate good thread loops in the sewing material, and form a jump needle.

Check whether there is a gap between the needle and the rod: check whether the spindle is good and standard, because the spindle is the key part of the hook thread. There must be no burrs, such as burrs, etc. if found, it should be used in time to use the diamond file or the oil and gold sand paper to grind up to the standard. Then the angle adjustment is made. The needle bar height is checked, and the needle bar height standard is: when the needle bar is at the lower dead point, the needle bar scale line should be on the second line.

In this way, when the needle bar rises to the first line, the angle between the needle and the spindle is the best.

Adjust the angle should first note: if there is a slight gap between the needle bar, we should use the left hand to push the needle bar slightly to the left, and then adjust it.

The angle between adjusting needle and rotary spindle is as follows: when the needle bar rises from the lower dead point to the first scale line, the spindle point should be 1.1-1.5cm on the pinhole of the machine, while the lateral clearance between the shuttle spindle and the machine needle is O.02-0.05cm. The feeding mechanism is also the key. First, check whether the feeding cam is standard;

Three. When sewing the sand washed silk, when sewing the high and low layers,

The real silk fabric after sand washing is soft, so when the needle and suture pass through the material, it is difficult to form the wire ring. But the high and low boundaries between the fabric and the bottom edge will lead to the gap at the bottom of the presser foot, which can not form the wire loop properly, thus leading to the phenomenon of needle jumping.

At this point, check whether there is a gap between the needle bar and check whether there is a puncture or baldness on the spindle point: check the height of the needle bar.

Because it is high and low level, can be classified as medium thick material type.

In order to adjust the height of the needle bar, it is necessary to adjust the needle bar height according to this type of condition. The adjustment of the needle bar height is based on the third line of the needle bar to the lower dead point scale. The specific adjustment method is that the adjustment angle should be adjusted to the first line when the scale third line goes up to the first line. Check whether the needle hole is standard or not. If the presser foot is pressed by the middle speed sewing machine, the back of the presser foot should be rubbed away. When the cloth is delivered, the presser foot and the upper and lower layer stitches will smoothly press down the seam material.

Four. Sewing

Bad delivery results in needle jumping.

When sewing leather, the needle is difficult to feed, resulting in needle jumping.

It can be repaired according to the above special thick material, but there are differences in solving the feeding problem. Nylon can be used to deal with the poor feeding. It can also handle the leather sewn with silicone oil.

Five, when sewing denim, use thick lines to break, roll and jump.

The stitching of the denim thickening line causes the wire ring to be difficult to form, so that the thick line cannot be broken, rolled and jumped from the thread ring of the shuttle hook.

In addition to using the above thick material method, there are differences in this regard, because the main line is thick, so that the hook can be repaired and grinded to maintain the coarse thread from the positioning hook when it is repaired.

It is best to choose a spinning shuttle that is not too loose.