Introduction
The manual mini sewing machine is a small mini sewing machine that looks like a mini pocket. With it, it can be used to sew overed edges or small damaged clothes for repair. It can be said that it is very convenient to use, and it can also be used to make some small and delicate DIY handicrafts. Let’s take a look at how to use a manual mini sewing machine and a diagram of how to use a pocket sewing machine.
The composition of the traditional sewing machine sewing machine 01
The head The head is the main part of the sewing machine. It is composed of four mechanisms: barbed material, hook thread, thread take-up and feeding mechanism, and auxiliary mechanisms such as thread winding, material pressing, and tooth-dropping. The base frame is divided into two forms: platen and chassis. The platen of the table-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 tabletops, such as one-bucket or multi-bucket folding Tibetan type, cabinet type, writing table and so on. The chassis of the chassis-type machine base plays the role of supporting and storing the machine head, making the sewing machine easy to carry and store. Transmission part The transmission part of the sewing machine is composed of parts such as frame, hand crank or motor. The frame is the backbone of the machine, supporting the deck and footrests. When in use, the pedal is stepped on, the pulley is driven to rotate by the crank, and the machine head is driven to rotate by the belt. Most hand cranks or motors are directly mounted on the nose. Accessories Sewing machine accessories include needles, bobbins, screwdrivers, oilers, etc. Sewing Principles of Sewing Machines 01 Just like a car, the basic principles of most sewing machines are the same. The heart of the car is the internal combustion engine, and the heart of the sewing machine is the coil stitching system. Coil stitching method is very different from ordinary hand sewing. In the simplest form of hand stitching, the sewer ties a thread in the small eye at the end of the needle, then runs the needle and thread completely through two pieces of fabric, from one side to the other, and back again. This way, the needle moves the thread in and out of the fabric, stitching them together. While this is very simple 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, then instantly grab it again on the other side. Then, it involves pulling the loose thread all the way out of the fabric, reversing the direction of the needle, and repeating all steps in the opposite direction. This process is too complicated and impractical for a simple machine, and even for manual work, it only works well with shorter wires. Instead, a sewing machine simply pushes the needle partially through the fabric. On a machine needle, the eye of the needle is just behind the point, not at the end of the needle. The needle is fixed on a needle bar, which is pulled up and down by a motor through a series of gears and cams (more on this later). As the tip of the needle goes through the fabric, it pulls a small loop on one side and the other. A device under the fabric grabs the loop and wraps it around another thread or another loop of the same thread. In the next two sections, we will see exactly how this system works. The simplest form of loop stitching is chain stitching. To sew a chain stitch, the sewing machine loops the same length of thread behind the 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 stitch-making device that grabs the stitch before the needle is pulled out moves synchronously with the needle. Once the needle pulls the fabric, the feed dog mechanism (described later) pulls the fabric forward. When the needle goes through the fabric again, the new loop will go straight through the middle of the previous loop. The device that makes the coil will grab the wire again and make the coil around the next coil. This way, each coil will hold the next coil in place. The main advantage of chain stitching is that it can be sewn very quickly. However, it is not particularly strong, and if one end of the thread loosens, the entire stitch may come loose. Most sewing machines use a stronger stitch called lockstitch. The most important elements of a lockstitch device are the hook and spool assembly. A spool is a coil of thread that is placed under the fabric. It is located in the center of the shuttle, which is rotated by a motor in synchronization with the movement of the needle. As with chain stitching, the needle pulls one loop through the fabric, it rises again as the feed dog moves the fabric forward, and another loop is pulled in. Instead of joining the different coils together, though, this stitching mechanism joins them with another piece of thread that’s unwound from the spool. As the needle pulls the thread into the loop, the rotating shuttle hooks the loop with the crochet hook. As the shuttle rotates, it pulls coils around the thread from the spool. This makes the stitching very strong. This kind of rotary shuttle is also evolved from the straight shuttle. The stitching principle of the sewing machine has evolved from a straight shuttle to a rotary shuttle, and has entered a mature stage. See more manual sewing machine use methods Hold the machine with four fingers of the right hand to support the machine base, and place the thumb on the top of the upper cover of the machine body to hold the machine smoothly. Threading Gently pull out the sewing thread on the spool, go through the lead diagram A, and then introduce the thread tension adjustment piece B. Then pass through the lead coil, C. The thread that has been drawn is temporarily placed next to the needle, and the threader From the front of the needle, to the fuselage joint, pass through the needle hole, and then introduce the thread end into the small hole of the threader, exit the threader and pull out the thread about 2-3 cm, and press the thread pressure plate to hold it for use. How to wear shoes on a sewing machine + cloth placement Lift the pressure plate with the right index finger, and place the fabric ready to be sewn, with a thickness of no more than 0.8 mm, flatly placed under the pressure plate, and gently put back the pressure plate to press the fabric. For sewing operation, use the left hand to hold the fabric, and the right thumb gently and quickly press down the top of the upper cover to the end, and then press the thumb down again. Repeatedly, the cloth feeding mechanism automatically sends the sewing material to the left, and the right hand of the holding machine gradually moves to the right. , hold the cloth in the left hand and gently move the object to the left according to the sewing rhythm until the sewing is finished. At the end of the sewing, cut the thread with scissors, gently pull up the pressure plate to take out the fabric, pull out the last thread from the reverse side of the fabric to be sewed, put it into the next coil and tie it tightly and tie a knot, the stitch will be It is firm; at the end of sewing, do not pull the thread by hard pulling the fabric, so as not to damage the needles and stitches. If the coil is replaced with a large coil, the spare extension rod can be connected to the spool shaft and inserted into the large coil. Put the spare plastic cap on the end of the rod to fix the large thread, then re-thread the thread, adjust the tension of the thread, and then sew; 50#-90# cotton thread or synthetic thread is the best. Change the needle, loosen the fixing screw, and take out the broken needle. Install a new needle as shown, be careful to make the flat face of the needle face up to the fixing screw, do not install it backwards. Needle type DHK-14. Note: ① If the stitches are too tight, adjust the pressure nut slightly counterclockwise; ② If the stitches are too loose, adjust the pressure nut slightly clockwise; ③ If the stitches are larger, the left hand can pull the cloth a little faster; ④ If the stitches need to be denser , the left hand can be slightly slower to pull the cloth. Manual sewing machine use diagram
Advantages and disadvantages of manual mini sewing machine Advantages01 Compared with traditional sewing machines, small electric sewing machines are small in size, occupy less space, and are light in weight. Girls can easily lift them with one hand, so they are very easy to pick and place. Convenient; practical accessories, work light and invisible thread cutter next to sewing machine foot; comes with removable bumper. The work light can be turned on and off as needed to provide illumination, but the work light will become very hot after a minute or two is turned on, so you should also be careful not to burn yourself when threading, inserting fabrics, etc. After finishing sewing, the thread can be cut with the configured thread cutter, which is convenient and quick. Disadvantage 01 Can’t tie thick fabrics; for different materials such as cotton, non-woven, chemical fiber and denim, if the fabric is too thick, the needle will be blocked, the operation will be inconvenient, the effect will not be good, and the quality will be difficult to guarantee; easy to jump the wire: operation platform Small, the foot switch is small, and the material of the components is fragile. In addition, it is easy to jump and jam when sewing; what to do with sewing machine jumper + threading is too complicated: threading requires multiple steps, which is relatively inconvenient. View more dynamic products Sewing machine maintenance method No response when booting on 01 First turn the handwheel to see if it will move, if it does not move, the thread is stuck or the chassis is stuck. Take off all the threads and re-thread them. , or take out the spool and tray and re-install it. The spool should be put in clockwise; if it can move, try to find a few batteries. If it can move after installing the battery, the transformer is broken. The broken thread and the bottom thread form a ball or float thread or jumper thread 02 If the sewing effect is poor and the lines are messy, the upper thread is too loose, just adjust the adjustment button of the lower thread, the red and plum colored arrow In the position shown, check whether there is any debris in the thread clamp, and whether the thread is smooth during sewing. The thread must be clamped between the two iron sheets. Be careful not to make a circle. If the spring is not elastic, you need to stretch the spring and then put it in. , and then push the button again until it is properly adjusted. (Note: the adjustment button is loose to the left, and tight to the right); In addition, the uneven force on the wire (after our test, we finally wound the wire on the metal spool as an open wire, the effect is the best), which is also a very important cause of wire breakage. The important reason; In addition, the friction between the thread and the black groove where the lower thread is placed will also cause the thread to break (reinstall the black groove); Changing a needle is also a good way to solve the broken thread; The machine needle and sewing thread are not suitable, and the sewing For materials with different thickness and thickness, choose different types of needles. For medium thickness, choose No. 14 needle. For thick materials such as denim, choose No. 16 or No. 18 needle. If the material is very thick, the sewing thread should not be too thin or too thin. Also jumpers and disconnects. The needle becomes bent or the needle of inferior quality also jumps the thread; or change a better thread, change a better needle; if the material is not uniform, the thread jumps, such as sewing the collar corner of the clothes, the edge and the inner thickness are very different, so If you can jump the thread, you can put several layers of newspaper in the thin place to make the thickness equal, and walk over the thick place manually; This problem can be solved by putting a layer of newspaper on each side, and then tearing off the newspaper after sewing; Lift up the sewing machine and carefully observe whether the lower thread cannot be hung when the needle runs down, and if so, you can re-install the needle , slightly downward, don’t press it all the way, and then observe the operation of the needle until the bottom thread can be caught; when installing the needle, the plane is facing the direction of the handwheel, and the other aspect is whether the threading of the needle hole is reversed. Another is whether the lower thread spool is put in clockwise, and the other is whether the direction of the thimble screw is reversed, change a little needle and a little thread to try the machine. Stuck 03
One method is to pull each threading position by hand to see where the error is. Another possibility is that the chassis is jammed. If the chassis is jammed, turn the handwheel and the needle will not go down. , you need to adjust the position of the bottom bobbin and bottom groove.
No thread 03
If you have tried all the above methods, but you still can’t get the bottom thread, that is to say, the needle goes over a row of holes, but there is no thread, you need to adjust the hook and needle. Positional relationship, generally speaking, as long as the upper thread can bring the bottom thread up, it will not be missed.
