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 stitch one or more layers of sewing material. Sewing machine can sew cotton, linen, silk, wool, man-made fibers and leather, plastics, paper and other products. The sewing stitches are neat and beautiful, flat and firm, fast and easy to use.And computer controlled sewing machine has a long history.
In 1790, Thomas is an English man, who invented a hand-held sewing machine with single-thread chain stitching for shoes and boots. This sewing machine is made of wood and parts are made of metal materials. It is the first sewing machine in the world.
In 1975, the United States invented a household multi-functional sewing machine controlled by a microcomputer. Professional industrial sewing machines are developing more widely and the sewing speed is increasing, such as the sewing machine has reached 10,000 stitches per minute. In 1979, the total output of sewing machines in the world reached 15885,000 units. China produced 587,000 units, which is the highest in the world.
In 1841, Timonier in France designed and manufactured a practical double-thread chain sewing machine; in 1846, Howard in the United States patented a curve-lock sewing machine with a sewing speed of 300 stitches per minute and efficiency exceeding five manual sewing artists; in 1851, American mechanical workers independently designed and manufactured a successful sewing machine. The sewing speed was 600 stitches per minute, and it was patented by the United States in 1853. Thereafter, sewing machines began to be widely used in production, and gradually increased the functions of buttons, buttonholes, reinforcement, embroidery and so on.
There are many kinds of classification methods for sewing machines, and it is more common to distinguish sewing machines according to their stitches and uses. The sewing machine's stitches can be classified into lock stitches and chain stitches. Lock stitches are the most common. They consist of two stitches, interwoven like twisting ropes, and the interwoven points are in the middle of the stitching material. Seen from the cross section of the stitches, the two stitches are like two locks locking each other, so they are called lock stitches. This kind of stitch is used in the sewing of cotton, wool or leather with small shrinkage. The front and back shapes are the same as a dotted line. The stitches are densely distributed and the fastness of sewing is generally higher than that of manual sewing.
Generally, sewing machines are composed of four parts: head, seat, transmission and accessories.
The head is the main part of the sewing machine.
The machine base is divided into two forms, the platform board and the chassis. The table board of the table-type machine base plays the role of supporting the machine head, and is used as a working table in sewing operation. There are many kinds of tables, including one or more buckets of folding type, cabinet type, writing desk type, etc.
The transmission part of sewing machine is composed of frame, hand rocker or motor. The frame is the support of the machine, supporting the platform and pedal. The accessories of sewing machine include machine needle, shuttle core, screwdriver, oil kettle, etc.