Principles of Sewing Machines (A Book of Sewing Machine Principles and Repair Techniques)

What is the Principle of Sewing Machine

Sewing machine was considered a household necessity a few decades ago, the treasure of every housewife, and nowadays there are many families who have such a machine. The invention of the sewing machine greatly contributed to the efficiency of factories at that time, and the invention of the sewing machine made it possible for factories to produce large quantities. There are many different models of sewing machines, not only for daily use in the home, but also electronic sewing machines for high end production. Do you know what the principle of the sewing machine is? The first thing you need to know is the principle of the sewing machine, and the second thing you need to know is how to use it.

Loop stitching system

Loop stitching system is the core of the sewing machine working principle, sewing machine automatic sewing is very simple, but also need to use gears, pulleys and motors and other mechanical collaboration to ensure that the work is carried out, the design principle is still very fine. And its sewing method is a bit different from manual sewing. Unlike traditional hand sewing, the sewing machine works by passing the needle through the clothing, and the eye of the needle is not at the end of the needle but behind the tip. Instead, the needle is fixed to a needle bar, which is worked by gears and cams that make an up and down motion to pull the needle bar. And it pulls out a small loop, and the fixture underneath the garment wraps this loop around another thread to achieve a stringing effect. This allows for continuous sewing with very little effort.

The principle of stitch formation

One, feeding the fabric

The machine needle descends from the top to the bottom, and at the same time transmits the fabric right under the needle, and stops feeding the fabric when the needle is about to get close to the fabric, and the procedure is completed.

Second, the needle leads

The needle continues to descend after the needle leads, the needle passes through the fabric and then descends to the lowest place, the thread is pulled down by the needle hole and the extrusion force between the needle bar and the sewing material to realize the state of tightly adhering to the needle bar, and it is in the state of being directly above the needle hole.

Three, the formation of the thread ring

The needle in the lowest position, the thread in the sewing material, the needle, the needle groove and the bobbin cover of the *** with the role of the work of the formation of the phase ring. Reach

Four, the pendulum shuttle hook thread

Through the pendulum bobbin tip rotates, thus hooking the thread loop, traction thread loop into the bobbin cover underneath.

Fifth, the noodle line leads to the bottom line

When the bobbin hooks the line and rotates below the bobbin center, the picking lever no longer picks the line but rises to retrieve the noodle line, so that the line ring shrinks and moves to cover the bottom line.

Sixth, tighten the stitch stage

In the cooperation of a variety of roles, the machine to tighten the sewing seam, the stitch is finally completed.

This allows the intersection of sewing threads in the middle of the sewing material, cross-section, as if there are two locks locked together, and therefore is also known as the "double thread chain stitch". It is very simple and convenient.

After listening to the above introduction to the principle of the sewing machine, do you also find that the principle of the small sewing machine is not simple? Some people call the sewing machine is a great and ingenious invention. Its appearance not only brings convenience to human life but also improves people's standard of living and quality of life. In the twenty-first century today, our daily life is inseparable from the sewing machine. The continuous development of society has also promoted the continuous progress of the sewing machine, I believe that the sewing machine will play a greater use in the future!

What is the principle of the sewing machine

In our previous life, if there are any clothes ah, pants ah, a hole, we usually let the family give us a manual patch, and then with the development of the times, the people developed a sewing machine, so that not only in the sewing effect on the improvement of the good to facilitate our lives, for the sewing machine should be no stranger to us. But when it comes to its working principle, do you know the principle of the sewing machine? Let me answer it.

About sewing machine:

Sewing machine is a sewing machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of the sewing material are interwoven or sewn together. Sewing machine can sew cotton, linen, silk, wool, man-made fibers and other fabrics and leather, plastic, paper and other products, sewing out of the seam neat and beautiful, flat and firm, sewing speed, easy to use.

Working Principle of Sewing Machine:

The machine needs to release the needle on one side of the fabric and then instantly grab it again on the other side. It then needs to pull the loose thread all the way out of the fabric, reverse the direction of the needle and then repeat all the steps in the opposite direction. This process is too complicated and impractical for a simple machine, and even for handwork, it only works well with shorter threads.

Instead, a sewing machine simply passes the needle partially through the fabric. On a machine needle, the eye is just behind the pointy end, not at the end of the needle.

The needle is fixed to the needle bar, which is pulled by a motor through a series of gears and cams in an up-and-down motion.

As the tip of the needle passes through the fabric, it pulls a small loop from one side to the other. A device underneath the fabric grabs this loop and wraps it around another thread or another loop of the same thread.

Maintaining the sewing machine should also pay attention to the following points:

1. When you are finished working, insert the needle into the needle hole plate, lift the presser foot, and also cover the head of the machine with the hood to prevent dust and chips from intruding.

2. When you start working, first check the main parts, step up how light and heavy, whether there is a special sound, whether the needle is normal, etc., such as the discovery of abnormal phenomena, should be promptly overhauled.

3. The machine is used for quite a long time, to carry out an overhaul, such as the discovery of wear and tear of the parts, to be replaced by new ones.

When using a sewing machine, we not only pay attention to the maintenance, but also to clean it regularly. In the whole sewing machine, the bobbin is the most sensitive place, of course, is also the most prone to disease, from time to time to give it clean up the dirt above, but also from time to time to add a little bit of oil in order to keep it working more smoothly. When not in use ah, be sure to take a piece of cloth or a special sewing machine cover to cover it, which also reduces the speed of it becomes dirty, but also brings great convenience to everyone.

What is the working principle of the sewing machine? How is it sewn on?

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 together one or more layers of the material. Sewing machine can sew cotton, linen, silk, wool, man-made fibers and other fabrics and leather, plastic, paper and other products, sewing out of the seam neat and beautiful, flat and firm, sewing speed, easy to use.

In 1790, the British St. Thomas invented sewing boots and shoes with a single line chain stitch hand-cranked sewing machine, this sewing machine is made of wood for the body, part of the parts made of metal materials, it is the world's first sewing machine.

In 1841, France's Timonier designed and manufactured a practical double-thread chain stitch sewing machine; in 1846, the United States of America's Howe obtained a patent for the curve lockstitch sewing machine, sewing speed of 300 stitches / min, the efficiency of more than five hand-operated sewers; in 1851, the United States mechanical workers Shengjia independently designed and manufactured the Shengjia sewing machine, sewing speed 600 stitches / min, and in 1853 to obtain a U.S. patent. In 1851, American mechanic Shengjia independently designed and built the Shengjia sewing machine with a sewing speed of 600 stitches/minute, and obtained a U.S. patent in 1853. Since then, the sewing machine began to be used in large quantities for production, and gradually added pinning buttons, locking buttonholes, reinforcement, embroidery and other functions.

In 1975, the United States invented a microcomputer-controlled sewing machine for home use. The development of professional industrial sewing machine is more extensive, sewing speed is more and more high, such as overlock machine has reached 10,000 stitches / min. 1979, the world's total output of sewing machines reached 15,885,000 units, of which China's output of 5,870,000 units, is the world's highest production of sewing machines in the country.

There are many ways to categorize sewing machines, the more common is to distinguish by stitch and use. Sewing machine stitch can be categorized into two types: lockstitch and chainstitch. Lock stitch is the most common, it consists of two sewing threads, intertwined with each other like a rope, the intertwining point in the middle of the sewing material. From the cross-section of the stitch, the two threads are interlocked like two locks, thus called lock stitch. This kind of stitch is used in cotton, woolen fabrics or leather with small shrinkage, and the shape of the front side and the back side are the same, like a dotted line. The stitch is densely distributed and the fastness of sewing generally exceeds that of hand sewing.

Chain stitch is made by the thread of the sewing thread of the loop self-connecting or interconnecting, commonly used single-thread chain, double-thread chain and three-thread overlock stitch. This type of stitch is characterized by elasticity and can be stretched along with the sewing material without breaking the thread, and is suitable for sewing garments made of elastic fabrics or for overlocking products and blanks that are easy to come loose from the sewing system.

The general sewing machine consists of four parts: the head, the seat, the drive and the accessories.

The head is the main part of the sewing machine. It consists of four mechanisms, namely, stabbing, hooking, picking and feeding, and auxiliary mechanisms, such as winding, pressing and dropping teeth, etc. The movements of the mechanisms work reasonably well together and circulate the work to sew the sewing material together.

The machine base is divided into two forms: table plate and chassis. The table plate of the machine base plays the role of supporting the head of the machine, and is used as a worktable during sewing operation. There are many kinds of table boards, including one or more buckets of folding type, cabinet type, writing desk type, etc. The chassis type of machine base has two types: one is for the head of the machine and the other is for the sewing machine. The chassis of the chassis-type machine base plays the role of supporting and storing the machine head, so that the sewing machine is easy to carry and storage.

The transmission part of the sewing machine consists of the frame, hand crank or motor and other components. The frame is the pillar of the machine, supporting the table plate and foot pedal. When in use, the operator steps on the foot pedal, through the crank to drive the rotation of the pulley, and through the belt to drive the machine head rotation. Most of the hand cranks or electric motors are mounted directly on the machine head.

Accessories for sewing machines include needles, bobbins, openers, and oil bottles.

What is the principle of a sewing machine?

The sewing machine simply passes the needle partially through the fabric, and on the needle, the eye of the needle is just behind the pointy end, not at the end of the needle.

The needle is fixed to the needle bar, which is pulled by a motor through a series of gears and cams in an up-and-down motion.

As the tip of the needle passes through the fabric, it pulls a small loop from one side to the other.

A device underneath the fabric grabs this loop and wraps it around another thread or another loop of the same thread.

Expanded Information

Principles of Sewing Machine Stitching

Just like automobiles, the basic principles of most sewing machines are the same.

Automobiles have an internal combustion engine at their core, and sewing machines have a loop stitching system at their core.

The simplest type of loop stitch is the chain stitch. To sew a chain stitch, the sewing machine makes a loop behind the thread with the same length of thread. The fabric sits on a metal plate under the needle and is held in place with a presser foot.

At the beginning of each stitch, the needle pulls a loop through the fabric.

A device that makes the loop catches the loop before the needle pulls it out, the device moves in sync with the needle, and once the needle pulls out of the fabric, a fabric feed tooth device pulls the fabric forward.

When the needle goes through the fabric again, the new loop will go right through the middle of the previous loop.

The device that makes the loops will grab the thread again and make loops around the next loop. In this way, each loop will hold the next loop in place.

The main advantage of chain stitch is that it can be sewn very quickly; however, it is not particularly strong, and if one end of the thread comes loose, the whole stitch may come undone.

Baidu Encyclopedia - Sewing Machine