Introduction to the use of Bar tacking machine heads

The process of piercing the sewing material with the machine needle is called needle feed. The needle is one of the crucial corridors of the Bar Tacking Machine, through which the colorful conduct of the needle bar medium and its medium are realized. When feeding the needle, the needle has to overcome the disunion force from the positive resistance of the sewing material and the side of the sewing material, and the pressure reaches the loftiest point due to the change of the commerce force between the sewing thread, the needle, and the sewing material.

Reducing the disunion between the needle and the material can be achieved by perfect manufacturing of the needle( especially the tip), sheeting the needle and softening the material, or adding silicone oil painting to the needle and thread.

In addition to the disunion between the needle and the sewing material, factors affecting the smoothness of the needle feed include the pressure of the presser bottom and the size of the hole in the needle plate. However, or inadequately manufactured, or the hole in the needle plate is too large If the needle is inaptly named. thus, in the case of meeting the sewing strength needs, one should try to use a lower periphery needle, special sewing accouterments should choose a special needle, in order to reduce disunion, to achieve good sewing results.

The process in which the needle carries the thread to the opposite side of the fabric is called thread insertion. The thread insertion phase starts when the needle is lowered until the eye of the needle comes into contact with the fabric, and ends when the asked sew length is formed( needle bar is in the lower dead center position).

The thread entry length isn't equal to the sew length needed to form a confluence. It's an important parameter for the conformation of a threaded circle that can be directly entered by the bobbin point and hook of the Bar Tacking Machine to help thread breakage and skipped aches. The quantum of thread introduced and the factual quantum of thread used in the overlock machine is about 6 times, so each section of thread has to constantly perforate the sewing material numerous times, and the increase in the number of disunion times affects the strength of the sewing thread, which can fluently lead to the miracle of thread breakage.

In the process of entering the thread, the wringing direction of the thread and the different exposure of the thread will beget the loose twist or wringing of the thread, and the size of the angle of the thread is an important factor affecting the change of the force of the thread, and thus the angle of the thread should be reduced as important as possible. Changes in the commerce force of the thread, sewing material and needle depend substantially on changes in the characteristics and consistency of the thread and sewing material, so the quality of the thread and the correct selection of the needle are veritably important.

The needle carries the thread through the sewing material to its smallest point and also rises again, forming a thread circle due to the disunion between the sewing material and the needle. The purpose of forming the thread circle is to enable the confluence ripper( hook) to enter the circle easily and to interweave the bottom thread. The thread circle is formed by the following 2 factors.

1) When the needle reaches the bottom dead center with the topstitching thread, the pressure of the thread is maximum due to the downcast pull of the needle eye and the extrusion of the needle blade and the material at the preface groove. When the needle rises, the pressure at the top of the needle eye disappears and a part of the thread is in a free state( at this point it's only necessary to add a veritably small force to the thread to make it change shape). As the needle rises, the thread itself has a certain adaptability, coupled with the bottom of the eye of the needle on the thread generated by the necklace, which is one of the conditions for the conformation of the thread circle.

2) From the structural point of view of the needle, the needle groove is divided into a long groove and a short groove( or notch), with one side of it being a long groove and the other side being a short groove( or notch). The lead- in groove is a long groove with a periphery larger than the periphery of the thread, and the lead- eschewal groove is a short groove( or notch) structure with a periphery lower than the thread. When the needle out of the sewing material, the preface of the niche away the thread and the sewing material doesn't disunion arbitrary needle rise, while the preface of the niche away the thread and the sewing material squeeze each other disunion occurs, can't rise together with the needle to stay under the sewing material. This disunion is obviously the short side of the groove( gap) is lesser than the long side of the groove, which is the conformation of another condition of the thread circle.

Three thread overlock sewing machine empty sewing, the conformation of the thread circle is substantially by bending the needle line fastening straight needle, so that the thread bedded in the needle groove, played a analogous part in the sewing material, so in the absence of flawless material can still form a confluence, which is different from other machines.

The size and stability of the thread circle is the key to the dependable entry of the confluence-former, the interweaving of the bottom thread and the conformation of the sewing. In order to insure that the sewing thread circle can be easily entered by the sewing machine tip, two conditions should be met originally, the sewing thread circle has a certain range, and secondly, the sewing thread circle must be vertical to the aeroplane of the Bar Tacking Machine tip's line when it enters the circle.

The conformation of the thread ring with the needle rise size and different, the needle shouldn't be too large or too small, the quantum of rise is too small thread ring range isn't enough, isn't conducive to the entry of the sewing machine. The needle rise is too large, although it's favorable for the sewing machine to enter, but due to the conformation of the thread ring for a long time caused by the deviation of the thread ring, so that the sewing machine isn't easy to enter. Tests have shown that the ideal stage for the conformation of the thread circle for sewing accoutrements of normal consistence and viscosity should be about 2 to 3 mm when the needle rises.

The needle plate hole periphery is too large or too small will also have a negative impact on the needle, if the needle plate hole is too large, when the needle into the sewing material when the impact will make the sewing material to slack, may form a needle hole, and when the needle back over when the sagging sewing material will be arbitrary needle together with the movement, affecting the normal conformation of the thread ring. In general, the periphery of the needle plate hole is about 1.5 to 2 times the periphery of the needle is applicable, but also to insure that the needle in the center of the needle plate hole.

The conformation and stabilization of the thread circle and the specifications of the needle, quality, nature of the material, texture, viscosity, consistence, thread specifications, raw material type, twist, twist direction, and the needle and needle plate, presser bottom pressure, press cloth state and other factors.

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