What should the sewing machine do with the broken line?

- Jun 06, 2018-

The jump line is a phenomenon that the sewing machine is sutured in the sewing machine, because the hook in the bottom of the machine can not draw the surface line or the surface line to be removed and slipped, and can not form the line step continuously. This is mainly due to the inconsistent movement time and movement position between the needle and the hook. Of course, it may also be that the needle can not form a coil and lead to jumper. Jumpers can be found in the following aspects:

One, pressure foot problem

Check whether the presser foot is installed too high and whether the cloth delivery speed is too fast. The pressure foot installation too high, will make the pressure foot press the strength of the fabric will not be enough, at this time the fabric will shake with the pressure foot, so that the line can not be pressed to form the coil; the pressure foot delivery speed is too fast, when conveying the fabric, the line will be taken away with the fabric with the fabric, the hook can not hook the line.

Two, the problem of machine needle

(one) check whether the surface line is worn out or wear a certain line.

(two) check whether the needle is properly installed, for example, the long slot of machine needle is reversed or installed skew.

(three) check whether the needle type is applicable, the height of the needle bar adjustment is accurate, and check whether the needle is attached to the top of the needle bar. If the needle is installed too high or too low, it will affect the hook picking.

(four) check whether the needle is distorted. When a twisted needle is used to stitch, the hook is not able to hook the thread because the coil formed is far away from the hook. A slightly curved needle is difficult to identify directly with the naked eye, and the needle can be rotated on the platform to distinguish it.

(five) check the time between the needle and the movement of the hook.  When the movement time of the needle and hook is fully matched, the hook can accurately pick up the suture.

(six) check whether the thickness of sewing needle is suitable for sewing thread. A large needle with a fine sewing thread will also lead to jumpers.  This is because the eye of the large needle needle is longer and wider, the hole position of the spiny fabric is larger, so that the fine sewing thread has a larger space movement. If the hook is beyond the line, there will be a jump line.

(seven) check whether the needle eye of the needle is blocked due to the melting of the sewing thread of the chemical fiber, so that the suture can not be transported normally, and the coil can not be formed. Custer

Three. The problem of sewing thread

(one) check whether the sewing thread is too thick, uneven in thickness or soft in stitches.

(two) check whether the tension of the surface line is too tight. The tension on the surface is too tight. The needle ring formed under the machine tool is too small to hook.

Four. Other problems

(one) check whether the hook is defective or not. The defective hook can not be sutured.

(two) check whether the needle plate hole is too large. Many manufacturers do not replace the matching needle plates in time when they produce small materials. The larger needle plate hole causes the fabric to be carried or removed from the round hole by the needle, which can not compress the sewing thread to form a coil, which may also lead to jumpers.

(three) check whether there are silt dust and dust in the feeding tooth and shuttle bed. We should pay attention to keeping it clean and clean, so as not to affect the formation of the line step.

Broken line

One, the sewing thread problem

(one) check the quality of the sewing thread. Moldy, metamorphic or nodular sutures are most easily disconnected.

(two) check whether the sewing thread selected matches the machine needle. Too many rules for sewing thread are not easy to break because of the lack of tough force. The sewing machine is too thick for sewing thread, so the sewing thread can not be cut through the pin hole smoothly.

(three) check whether the tension of the line is too tight. The tension is too tight and it is easy to break the line.

(four) whether the needle holes of the inspection machine are silted up, resulting in unsmooth delivery of sewing threads.

Two, the problem of machine needle

(one) check whether there is a phenomenon of needle heat fuse thread, especially in the use of chemical fiber suture, because the car is running at high speed, the machine needle repeats the piercing fabric friction heat, so that the low melting point of chemical fiber suture is fused.

(two) check whether the hook position is appropriate. The hook is too close to the pinhole and easily breaks the stitches when taking the thread.

Three. Other problems

(one) check whether the needle and needle plate are firmly installed.  Loosening machine needle or needle plate will make the needle and needle plate touch each other and rub the section line.

(two) check if all the line passes (including coil, needle eye, hook, needle plate hole, pin hole, etc.) have bending and defect to avoid sewing thread.

(three) check whether the bottom line is full or uneven, the bottom line is too full or uneven, and the bottom line is not smooth enough to cause the bottom line to break.

In addition, the operating workers have poor gestures or speed without a sense of rhythm, which will pull the fabric and cut the surface line to the cloth, or pull the line hook up and down.


To solve the problem of jumpers and disconnection, different ways should be taken to deal with the causes of jumpers and disconnection.

1. A solution to jumpers and disconnection due to needle problems.

(one) needles without blunt needle tip must be checked regularly and replaced in time.

(two) select the machine needle with special surface treatment. Among them, the needle with the Teflon coating can reduce the friction resistance between the fabric and the fabric, restrain the high heat of the needle, prevent the stitches from the needle heat fuse and melt the fiber line, and avoid the jump line and the broken line.

(three) add a blow dryer near the machine needle to speed up the heat dissipation of the needle.