9 points of needle-puller jumper maintenance
As one of the important tools in the modern clothing production, the buttoning machine is the most commonly used special equipment for garment enterprises. The phenomenon of skipping stitches is also a common fault phenomenon in actual operation and application. As we all know, the cause of the needle-pulling machine jump needle is very complicated, the following author only to brother LK3-438 sewing machine as an example, the reasons for the needle-pulling machine jumper causes and exclusion methods for the following points of analysis, for the reader's reference only. 1. Check the machine needle for hair, bluntness, and bending. If you have the above phenomenon, replace the needle in time. The needles are generally TQ1, TQ7, DP17, etc. The needles of different specifications and models can be selected according to the fabric and buttons. 2. The tension of the wire plate and the thread take-up spring is too large. This tension must match the tension of the shuttle. LK3-438 buttoning machine has two upper and lower thread clamps. Generally, the thread clamp should not be over-tightened. If it is too tight, the needle stay on the needle hole after parking will be very short, it will easily cause off-line; if it is too loose, Staying in line will be very long. The lower gripper mainly controls the tension of the upper thread, generally 50 grams force is appropriate. 3. Check whether the shuttle tip of the shuttle has hairiness or bluntness. If there is any such phenomenon, repair or replace the new shuttle. 4. Check if the shuttle hook is too early. Adjustment method: When the needle bar is at the bottom dead center, the right side of the shuttle tip and the center line of the needle should be 3 mm. When the needle is lifted by 2.5 mm, the tip of the shuttle is exactly at the center line of the needle. At this time, the tip of the shuttle is 2 mm above the needle hole. The clearance between the tip of the shuttle and the needle is 0.1 mm. The gap is too big to skip the needle (see Figure 1). 5. Check if the clips are worn out. If the clips are shaking around, you should replace them in time. 6. Check if the clip swing time is too fast or too slow. The adjustment method: turn on the head, loosen the 3 setscrews on the feed wheel, and move the feed wheel slightly to the right and left, so that when the needle is lifted, the needle tip will be 10mm away from the button, and the new folder will start swinging; When the button is close to 10mm, the clip should stop swinging. 7. Check whether the swing of the clip is consistent with the button hole and whether the needle is in the center of the button hole. If it does not suit to adjust the swing width. 8. Whether or not the pad is under the presser foot when the buckle is buckled, if the pad under the presser foot is replaced by a loose hook, the under pad of the presser foot will affect the stability of the needle thread loop and cause the needle to jump. 9. The brother LK3-438 sewing machine has a certain structural difference from the heavy machine 1852 sewing machine. Brother LK3-438 buttoning machine in practical applications, it is very easy to occur when the needle does not go on the phenomenon of several needles is due to the lower dial plate can not be fixed up to the bottom line, resulting in a small amount of the bottom line after stopping the line cut, In the second shot, it was not on the baseline. Through careful study, the author made some improvement on the dial board, and the effect was very good. The phenomenon that the needle did not go on the needle was obviously reduced. Stock Fabric,Acetate Viscose Fabric,Viscose Acetate Fabric,Acetate And Viscose Fabric Shaoxing Yuantiao Imp&Exp.,Ltd. , https://www.jeesun-fabric.com