How To Adjust The Matching Time Of Sewing Machine Needle And Bending Needle

　　 Sewing machine The most important and easily overlooked is that when the needle drops to the lowest point, the bent needle must move to the farthest limit position to the right. Similarly, when the needle rises to the highest point, the bent needle must move left to the farthest limit position, and repeated observation and confirmation are required.

In addition to the left and right movements, there are forward (facing the operator) and backward (away from the operator). It should be noted that when the bending needle moves forward and backward fastest, it should be placed at the limit position of the left and right movement of the bending needle, and the movement of the bending needle back and forth should be minimized when the bending needle moves to the left and reaches the needle position. At this time, when scraping the needle to the left and right, it is necessary to prevent the needle from moving too far to the right. Of course, you can also adjust the amount of forward and backward movement of the bending needle and rotate the needle bar angle slightly clockwise to achieve the best effect. Some machines can adjust the range of forward and backward movement of the bending needle, while others can't.

When Needle When descending to the lowest position, the distance between the curved needle tip and the right needle is 3-4mm. When the needle rises and the looper moves to the left, special attention should be paid to: in order to facilitate the needle to enter the triangular loop on the back of the looper, the correct adjustment standard of the needle take-up cam is as follows: when the needle reaches the lower edge of the bending needle, that is to say, when the needle goes down to the lower edge of the looper, that is to say, when the needle enters the triangular loop safely, the curved needle on the needle take-up cam is located at the highest point of the thread taking-up cam. It is necessary to use the needle take-up cam to make the needle in the tension state when the needle enters the triangular loop. However, excessive tension will lead to thread breakage and excessive tension on the back of the sewing material. When the bending needle tip reaches the center of the right needle, the lower part of the bent needle tip is 2.5mm above the needle eye. At this time, the gap between the bending needle and the machine needle is 0-0.05mm.

When the needle descends to arrive Curved needle On the back, the needle hole of the left needle meets the threading hole at the head of the bending needle. At this time, the back of the looper is allowed to touch the needle slightly, and the speed of the needle take-up cam can be slightly adjusted on the basis of the above standards. If the speed is adjusted according to its own rotation direction, the tension of the curved needle thread on the back of the sewing material appears to be relatively loose. The design of the needle take-up cam varies from factory to factory, and some may be different from the actual size and shape, If the gap is too large, it is easy to cause jumper and increase maintenance difficulty. The function of the thread take-up cam of curved needle thread is: when the bending needle moves to the left, it can timely provide the bending needle with the amount of sewing thread it needs to move and weave the stitch, and when the looper moves to the right, it can timely withdraw the surplus sewing thread. On the contrary, it appears that the tension of curved needle thread is tight. But it's better not to scratch or the slighter the better.