First, sewing machine maintenance
(A) sewing machine vibration failure
1. Smooth machine, smooth machine. Shuttle structure is the key to noise and vibration of modern sewing machines. When installing the machine, the screws must be tightened, and the screws on the table surface should be screwed deep to avoid exposing the surface.
2.？ When using the machine, don't put all the weight of people on the bed board to prevent the bed board from being deformed.
(2) The sewing machine is out of order.
1. The rotation of the nose is stagnant
Analysis: wrong lubricating oil, especially vegetable oil; There is too much dirt in the shuttle bed; Connecting rod screws and taper screws are installed too tightly. Treatment: after cleaning with kerosene, refill sewing machine oil; Clean the exchange bed; Loosen the screw to ensure its clearance.
2. When turning, it will stagnate for half a circle, lightly slide for half a circle or have a stagnation point every turn.
Analysis: the threaded end of the inner wheel of the shuttle bed is not only stagnant for half a turn, but also accompanied by severe jitter and noise; The position of the feed tooth is too high or the gap between the teeth is dirty, so that the feed tooth collides with the needle plate when it rises. Treatment: clean the shuttle bed and add a little sewing machine oil; Clean or lower the feed teeth; Replace or straighten the needle bar.
My nose is stuck and I can't move.
Analysis: the position of the feed tooth is too forward or too backward, and it touches the needle plate; The needle bar installation position is too high, and the needle clamp hits the casing. Treatment method: adjust the position of feeding teeth, re-align needles and adjust the height of needle bar.
4. The noise comes from the needle mechanism
Analysis: the needle bar, needle bar sleeve and small connecting rod are too worn and the transmission is not smooth; Small connecting rod screw and needle bar crank screw are loose. Treatment: replace new needle bar, needle bar sleeve, small connecting rod and other accessories; Re-tighten the small connecting rod screw and loosen the needle bar crank screw.
5. The noise comes from the feed mechanism
Analysis: the large spiral cone screw is worn or loose, the feeder hits the needle plate, and the needle distance adjustment mechanism is loose. Treatment method: grind or readjust the large taper screw, readjust the contact between the feeder and the needle plate, readjust or tighten the screw of the needle distance adjustment mechanism.
6. Noise comes from the shuttle swinging mechanism.
Analysis: The wear of shuttle and shuttle bed leads to large gap, and the gap between shuttle and shuttle seat is too large, resulting in impact. Treatment: replace the new shuttle and shuttle bed, adjust the distance or replace the new shuttle and shuttle frame.
7. General noise
Analysis: the upper shaft, the lower shaft and the shaft sleeve are worn, which leads to the movement of the upper and lower shafts; Or the machine is short of oil. Treatment: replace the upper shaft, lower shaft and shaft sleeve with new ones, or adjust the plane clearance between the upper and lower shafts, pay attention to maintenance and add lubricating oil on time.
(3) Line sticking problem
1. There is dirt. Push open the needle board, take out the shuttle sleeve, shuttle bed and shuttle core, clean them with cotton cloth, use a thick duck brush to remove the dirt between the cloth feeding teeth, and drip engine oil before running? ;
2. The wire is caught in the nose and the spring is too tight or too loose. (adjust the tightness to make it pull out smoothly and naturally)? ;
3. The screw on the shuttle sleeve is too tight or too loose. (Simple method, adjusting screws);
4. There are two ways to prevent the sticking problem. One is that the thickness of the top silk bottom line should be consistent. The second is to thread the thread in the prescribed order, and you can't wear it wrong.
Second, household sewing machines.
Household sewing machines have many functions, such as straight sewing, zigzag sewing and keyhole. Usually, they are driven by human power (pedal and manual drive) and also by electric motors. According to daily application, there are other types of household sewing machines, such as straight sewing machines and zigzag sewing machines.
1, function
Household sewing machine integrates the functions of straight sewing, zigzag sewing and keyhole, and you can enjoy sewing with only one machine at home.
Some household sewing machines also have the function of automatically adjusting thread tension, and some can realize automatic reverse sewing and automatic thread cutting with one key. Anyone can use it easily.
In addition, some household sewing machines can also realize professional embroidery function through computer control.
Step 2 classify
Linear trajectory
A sewing machine that uses two stitches of a needle and a shuttle to form a lock stitch. You can sew two or more layers of sewing materials, or sew decorative stitches on one layer of sewing materials. It is the most popular basic type of household sewing machine. ?
The continuous stitches sewn by the straight seam sewing machine have the same shape on the front and back, such as the dotted line. The stitch distribution is dense, and the sewing fastness is generally higher than that of manual sewing. Suitable for sewing cotton, linen, silk, wool, chemical fiber elastic fabric or leather and other sewing materials, such as clothing, household items and so on. The thickness of sewing can be from two layers of silk to? 5 mm thick free woolen cloth. After installing special accessories, it can be used for embroidery, curling, hemming, punching, thread embedding, buttonhole locking and so on.
The straight seam sewing machine consists of a machine head, a frame and a platen. The machine head is the main part of the sewing machine (Figure 1). It consists of four mechanisms: puncture, hooking, picking and feeding, and winding auxiliary mechanism. The actions of all mechanisms are reasonably coordinated and work circularly to form a stitch.
There are two main types of linear sewing machines: swing shuttle and rotary shuttle.
Shuttle sewing machine:
It is a popular household sewing machine mass-produced in China. There are JA type and JB type JA type which adopt cam thread take-up and hook mechanism; JB type adopts connecting rod thread take-up and shuttle hook mechanism. Shuttle looms can sew up to 1000 stitches per minute, while the general sewing speed is 600 ~ 800 stitches per minute. The shuttle swinging back and forth has a large inertial impact, but it produces less vibration and noise than the long shuttle, and the parts are more wear-resistant.
Shuttle sewing machine:
The model is JC. Adopt connecting rod thread picking and rotating shuttle thread hooking mechanism. The rotary shuttle rotates smoothly, the vibration and noise are less than those of the pendulum shuttle, and the parts are wear-resistant, which can improve the sewing speed. However, the structure of the shuttle is complex, the manufacturing cost is high, and ordinary household sewing machines are rarely used.
The above sewing machine maintenance methods are only partial. If you want to know more, please stay tuned.
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