What is a Needle Feed Sewing Machine?

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material.

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A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material.

The sewing machine can sew cotton,

Generally, the sewing machine consists of the machine head ,

There are many classification methods of sewing machines, and it is more common to distinguish them by stitches and uses. The stitches of a sewing machine can be classified into two types: lock stitches and chain stitches. Lock stitches are the most common. They consist of two stitches, intertwined with each other like a rubbing rope, and the interweaving point is in the middle of the stitching material. Seen from the cross section of the stitches, the two stitches are like two locks locked to each other, so they are called lock stitches. This stitch is used for sewing materials such as cotton, wool or leather with low shrinkage. The front and back shapes are the same, like a dotted line. The stitches are densely distributed, and the fastness of sewing is generally better than manual sewing.

Chain stitches are self-connected or interconnected by stitch loops. Commonly used are single-thread chain, double-thread chain and three-thread overlock stitches. The characteristic of this kind of stitch is that the stitch is full of elasticity, which can expand and contract with the sewing material without breaking the suture. It is suitable for garments made of thread elastic fabrics or products and packages that are easy to loosen.

In addition, sewing machines can be divided into household, industrial, and service industry machines according to their uses. According to the driving mode, they can also be divided into manual sewing machines, pedal sewing machines, and electric sewing machines.

Irregular clothing

In the process of sewing clothes with a sewing machine, there are sometimes irregularities in the movement speed of the clothes and the length of the stitches. The cloth moves forward by the cooperation of the cloth feed teeth and the presser foot. Therefore, when the above-mentioned irregular movement occurs, it can be concluded that the teeth and the presser foot are faulty or the pressure is not adjusted properly. For example, the presser foot pressure is too low. If the fabric is not pressed tightly, it will cause irregular movement. At this time, just turn the pressure-adjusting screw down to compact the fabric. The presser foot is too high to hold the fabric, which will cause the fabric to move arbitrarily or not at all. When adjusting, first raise the presser foot wrench, loosen the guide screw, and then move the presser foot bar from top to bottom After the distance between the presser foot and the needle plate is adjusted to a height of 7-8 mm, the screws are tightened immediately before driving.

There is another reason, because the teeth screws are loose, which causes the teeth to shake left and right during operation, so that the clothing cannot be moved forward regularly. The treatment method is to remove the needle plate. Tighten the two dental screws. After tightening, install the needle plate, and check whether the two sides of the teeth are rubbing with the edge of the needle plate groove. If there is friction, it will cause noise and weight. At this time, you must remove the needle plate and loosen the tooth screws Adjust the position of the teeth to the middle of the throat plate slot, and then tighten the tooth screws, then install the throat plate.

The fabric does not go forward

The movement of the cloth is all carried by the teeth. When the clothing does not move at all, it is only to find faults on the teeth. If the teeth are too low, the fabric cannot move forward. When adjusting, first lift up the machine head, loosen the teeth-cranking screw, and then gently lift the bracket with a screwdriver to make the feed teeth toward. The needle board is 0.8-1 mm above it. It is the standard size of tooth height. As long as it is adjusted to this position, the cloth can move normally. Finally tighten the screws. When tightening the screws, the head must also be pulled up.

The cloth goes back and forth

When sewing clothing, it often occurs that the clothing moves back and forth, that is, one step forward and one step backward. This is caused by the cloth feed tooth being too high, the surface of the teeth exposed to the needle plate is too high, and the teeth are always exposed outside the needle plate to reciprocate, causing the cloth to move back and forth. When adjusting, loosen the teeth lifting crank screw, press the teeth lightly with a screwdriver to lower the cloth feed teeth to the standard height, that is, the teeth are 0.8-1 mm above the needle plate, and then tighten the crank screws.

Backward

In the sewing work, it sometimes appears that the cloth does not move forward, but instead moves toward the operator, that is, the cloth moves backward. This failure occurs because the angle of the upper shaft crank and the cam eccentric screw is incorrect. So the teeth can move forward rhythmically. It is completely driven by the feed cam. Because the cam itself is eccentric. Therefore, the tooth fork is moved forward and backward, and the tooth fork drives the cloth feed shaft and the tooth frame, so that the teeth move back and forth. It can be seen that the eccentric position of the cam is very important.

Standard angle of upper shaft crank and cam screw. As long as the angle between the cam screw and the upper shaft crank is adjusted to the 260-300 position, the cloth will not back up.

When adjusting, pull down the back cover of the machine head to see the feed cam. Insert the screwdriver into the housing, loosen the feed cam screw, and then turn the screw to 260-300 with the upper shaft. Position, and then tighten the cam screw.