in the process of using the jeans sewing machine to sew clothing, sometimes the speed of the clothing is not uniform, and the stitches are long and short. clothing material moves forward by the cooperation of feeding teeth and presser foot. therefore, when the above-mentioned irregular movement occurs in the clothing material, it can be concluded that the teeth and presser foot have malfunctioned 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 downward to compress the clothing material. if the presser foot is too high, it will not be able to press the material, and it will also cause the material to move randomly or not at all. when adjusting, first lift the presser foot wrench, loosen the screw of the guide frame, and then move the presser foot lever from top to bottom, so that after adjusting the distance between the presser foot and the needle plate to a height of 7-8 mm, tighten the screws immediately before driving.

another reason is that the tooth screws are loose, causing the teeth to shake from side to side during operation, so that the clothing cannot move forward regularly. the solution is to remove the needle plate. tighten the two tooth screws. after tightening, install the needle plate and check whether the two sides of the teeth rub against the edge of the needle plate groove. if there

just like cars, the basic principles of most sewing machines are the same. the core of the car is the internal combustion engine, the hat ironing machine, and the core of the sewing machine is the stitching system. the loop stitching method is very different from ordinary hand sewing. in the simplest form of hand stitching, the seamstress attaches a thread through the eyelet at the end of the needle, then passes the needle and thread completely through the two pieces of fabric, from one side to the other and back again. this way, the needle drives the thread in and out of the fabric, stitching them together.
while this is very easy to do by hand, it is extremely difficult to pull with a machine. the machine needs to release the needle on one side of the fabric and grab it again instantly on the other side. it then entails pulling all the loose threads out of the fabric, reversing the direction of the needle, and repeating all steps in the opposite direction. the process was too complicated for a simple machine to be practical, and even by hand it only worked well with shorter threads.
instead, a sewing machine simply passes the needle partially through the fabric. on the needle, the eye of the needle is just behind the point, not at the end of the needle. the needle is attached to the needle bar, which is pulled up and down by a motor through a series of gears and cams (more on that later).
as the tip of the needle passes through the fabric, it pulls a small loop

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 fabrics such as cotton, fiber crops, silk, wool, and artificial fibers, and products such as leather, plastics, and paper. and it derived art forms such as hand-push embroidery, computerized pattern machine, and computer embroidery.
categories of sewing machines
according to the purpose of the sewing machine, it can be divided into household sewing machines, industrial sewing machines and service industry sewing machines between the two; according to the driving mode, it can be divided into hand, pedal and electric sewing machines; according to the sewing stitches can be divided into sewing machine for hand stitch, bartack stitch, single-thread chainstitch, double-thread or multiple-thread chainstitch, single-thread or multiple-thread covering chainstitch and multiple-thread covering chainstitch.
household sewing machinein the early days, they were basically single-needle, hand-cranked sewing machines. later, electric-driven sewing machines were invented and became the mainstream in the market. divided according to its mechanism and stitch form, it can be roughly summarized as ja type, jb type, jg type, and jh type. a kind of household sewing machine—jg type household electronic multifunctional sewing machine.
industrial sewing machinemost of the industrial

a general sewing machine like a shoes sewing machine consists of four parts: the machine head, machine base, transmission and accessories. the machine head is the main part of the sewing machine. it consists of four mechanisms of barbed material, thread hook, thread take-up, and material feeding, and auxiliary mechanisms such as winding, pressing, and falling teeth.
ordinary hat sewing machine bases are divided into two forms: platen and chassis. the platen of the platen type machine base plays the role of supporting the machine head, and is used as a workbench during sewing operations. there are many styles of table tops, such as folding tibetan type with one bucket or multiple buckets, cabinet type, desk type and so on. the case of the case-type machine base plays a role in supporting and storing the machine head, making the sewing machine easy to carry and store.
the transmission part of the sewing machine is composed of components such as a frame, a hand crank or a motor. the frame is the backbone of the machine, supporting the table and pedals. when in use, the operator steps on the pedal, the crank drives the pulley to rotate, and the belt drives the machine head to rotate. most of the hand cranks or motors are directly mounted on the machine head. the annex of sewing machine comprises machine needle, bobbin, screwdriver, oiler etc.
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