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Solution to the trouble of double needle lockstitch sewing machine

                       
Update:2021.10.2021-10-25T10:11:22+00:00
Summary:

The double-needle sewing machine refers to a sewing mac […]

The double-needle sewing machine refers to a sewing machine with two needles, and the result is that the two threads are side by side and parallel to each other. There are fewer double stitches in a pair of trousers than flat stitches. Therefore, in the workshop, the matching of flat stitches and double stitches is about 5:1, but it is also indispensable. The double needle has high efficiency, and the double lines are parallel and beautiful. All kinds of double stitch machines have a very headache problem, that is, the car is unstable. The maintenance rate is very high, especially after a few years of use, a lot of phase time is a bit messy. Many machine repairs can't be adjusted well. From the editor's point of view, many phases and timings are adjusted and there are not many problems.
First, we start with the needle post and the feed tooth. First adjust the feeding amount (adjusting dial) to zero. When there is no feeding, turn the flywheel to make the needle column at the bottom dead center. Loosen the fastening screw of the horizontal feed rocker arm, and adjust the inner distance between the needle post and the presser foot bar to about 1.5mm. If it is not adjusted properly, it will cause skipped stitches and broken stitches. Note that the needle drop point of the feed tooth hole will change after adjustment, and the feed tooth must be adjusted to match. The feeding time should be adjusted so that the engraved point of the horizontal feeding cam coincides with the engraved point of the lower shaft. Do not misalign the horizontal feed cam, otherwise it will turn heavy. It is very important to make the needle enter along the center of the feeding perforation, otherwise the floating phenomenon will occur.
Misunderstanding one, general machine repairs will adjust the needle bar to match the feed sprocket hole and the needle drop point is not in the middle of the feed sprocket hole, especially when the hole is long, and then there is the matching time of the needle and the hook. The bottom dead center of the needle is adjusted according to the sewing material. When the needle rises 2.2mm from the bottom dead center (or look at the lower end surface of the engraved line and the needle column sleeve), move the hook shaft seat left and right to make the distance between the needle and the hook tip be 0-0.05mm , The distance between the needle and the needle stop is 0-0.07mm, and the center line of the needle is consistent with the tip of the hook. It depends on the actual situation to adjust the hooking time faster or slower.
Turn the hand wheel to put the thread return hook in the final position. Rotate the inner hook in the opposite direction to the direction of rotation of the hook, so that the hook stop is in contact with the needle plate groove. Loosen the fixing screw of the thread return hook to make the gap between the inner shuttle triangle baffle and the thread return hook 0.2-0.3mm. The gap is too large, causing the thread sleeve to become loose and the thread to break. The gap is too small, causing damage to the return hook. Don't forget, the gap between the upper surface of the needle plate groove and the upper surface of the shuttle stopper is adjusted to 0.8-1.0mm. Replace the backing plate on the rotary hook shaft to change the height of the rotary hook.
Misunderstanding two, general machine repair will raise the needle board to adjust its gap. The last is the matching time of the upper shaft and the lower shaft. Remove the synchronous toothed belt from the toothed wheel. Turn the hand wheel so that the engraved line of the hand wheel is aligned with the engraved point on the front of the car. Rotate the lower shaft so that there is a small hole in the base and the first screw of the lower shaft gear wheel is aligned. Ensure that the positions of the upper shaft and the lower shaft do not move, and install the synchronous toothed belt. If the time is not right, the needle drop point of the feed tooth, the feed time, the change of the mechanical jam, etc.

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