Tips For Garment Workers To Deal With Needle Skipping Of Different Fabrics

Humen clothing For down The stitch skipping problem caused by different fabrics such as silk, denim, etc. is analyzed in detail.

Jumping stitches of down fabric at extra thick seams

In the process of sewing down clothes, it is easy to add vacuum cotton to down fabrics to form 0.7cm-1.1? Cm thick layer. In this state, the needle and suture are not easy to form a good thread loop, which may cause needle skipping of the equipment.

According to the situation of this extra thick layer operation, we must first solve the feeding problem by replacing the feed dog with a thick feed dog. The needle holding hole of the needle plate should be larger, and the feed cam should be adjusted accordingly. The adjustment standard is that when the tooth reaches the highest point, the needle tip of the needle should be in the needle hole of the needle plate. The needle bar height should also be greatly adjusted. When the needle bar height should be at the bottom dead point of the needle bar, go down to the third line of the needle bar scale and then go down 0.1? Cm. In this way, the principle of increasing needle bar travel is used to complete thread hooking.

In addition, the needle and thread hooking time also change. Adjust the angle when the needle bar rises from the bottom dead point to the first line of the scale, and the angle adjustment value is consistent with the above. In addition, we need to increase the presser foot pressure. Because it is sewing extra thick material, the needle is easy to generate friction and heat, which may also make it difficult to form the thread loop. Therefore, if necessary, we need to fill silicone oil at the thread passing point to solve this problem.

The real silk before sand washing is skipping stitches due to two layers of fabric

The real silk fabric is very astringent and hard during the sewing process before being sand washed, which causes that the machine needle and suture cannot produce good thread loops in the sewing material, thus forming skipped stitches.

We need to check whether the needle bar is worn and has clearance, and whether the rotary hook tip is good and standard. Because the rotary hook tip is the key part of the hook, there must be no burr, bald tip and other defects. If found, we should timely use a diamond file or oil stone metallographic sandpaper to polish it to the standard, and then adjust the angle.

We also need to check the needle bar height. The needle bar height standard is: when the needle bar is at the bottom dead point, the needle bar scale line should be on the second line. In this way, when the needle bar rises to the first thread, it is best to adjust the angle between the needle and the rotary hook tip. What we need to note is that the angle should be adjusted first: if the needle bar has a slight gap, the needle bar should be pushed slightly to the left with the left hand before adjustment.

The standard for adjusting the angle between the needle and the rotary hook is: when the needle bar rises from the bottom dead point to the first scale line, the rotary hook tip should be 1.1cm-1.5cm above the needle hole, and the lateral clearance between the rotary hook tip and the needle is 0.02cm-0.05cm.

In addition, the cloth feeding mechanism is also the key. First, check whether the cloth feeding cam is labeled. Because the teeth should be lower when sewing thin materials, the feed cam should be properly adjusted.

The truth after sand washing silk Skipping stitches when sewing high and low layers

The real silk fabric after sand washing is soft, so it is difficult to form thread loops when the machine needle and suture pass through the sewing material. However, for the high and low places where the fabric and the bottom edge overlap, it will even lead to gaps under the presser foot at the high and low places, which can not form thread loops normally, resulting in needle skipping.

At this time, we should check whether the needle bar has clearance, whether the rotary hook tip has pricking and bald tip, and check the height of the needle bar. Because it is a high-low layer sewing operation, it can be classified as a medium thick material type. When repairing the needle skipping fault, we should think calmly before starting to adjust the height of the needle bar. According to this type of situation, we determine the needle bar height to be adjusted based on the third line of the scale from the needle bar to the bottom dead point. The specific adjustment method is that the adjustment angle should be adjusted according to various standards when the third line of the scale rises to the first line. We should check whether the needle hole of the needle plate is standard. If the presser foot is used by the medium speed flat sewing machine, the back of the presser foot should be rubbed off, so that when the cloth is fed, the presser foot and the high-low layer sewing material can smoothly press the sewing material.

seam Leatherwear Needle skipping due to poor cloth feeding

When sewing leather, the fabric is astringent and the feeding is not smooth, so needle skipping occurs. We can use the above method to repair the extra thick material, but there are some differences in solving the feeding problem. Nylon presser foot can be used to deal with the poor feeding, or silicone oil can be applied to the leather sewing.

When sewing denim, use thick thread to break, roll and skip stitches

The sewing of denim thickened thread is easy to lead to the difficulty in forming the thread loop, and the thick thread cannot come out of the thread loop from the positioning hook of the rotary hook, resulting in thread breakage, thread rolling and needle skipping.

In addition to the above thick material type method repair In addition, there are some differences in this operation, because the thick wire is mainly used, so we also need to process and grind the positioning hook of the rotary hook during maintenance, so that the thick wire can come out of the positioning hook easily. Pay special attention. It is better to choose a new or less worn rotary hook.