How much do you know about the common maintenance problems of veneer sewing machines? The following is a small series of answers for you, veneer sewing machine common jumper problems are as follows.
- If the threading method is incorrect, rewire according to the “threading diagram”;
- The installation of the straight needle is not correct. Check the height and facing position of the needle, so that the needle moves downward slightly in front of the needle plate hole;
- If the needle tip of straight needle is hairy or bent, replace it with a new one;
- The needle tip of the bending needle becomes blunt, and it can be polished with oilstone or fine sandpaper, or it can be replaced with a new one;
- If the suture tension is too large or too small, adjust the suture tension appropriately;
- The bending needle can not cover the loop of the right straight needle, and the right stitch of the lower decorative line jumps. The loop of the straight needle is too small, so increase the amount of jumper properly;
- The bending needle cannot cover the loop of the left straight needle, the left stitch of the lower decorative line jumps, and the loop of the straight needle is too large, so the amount of jumper should be appropriately reduced;
- The bending needle can not hook the middle and left straight needle ring at the same time, and the middle line and left line of the lower decorative line are all skipping, so the amount of jumper should be reduced appropriately;
- The middle and left stitches on the back of the looper can not be penetrated into the triangle of knitting needle and curved needle thread, and the back middle of the left side stitch jumps. Check whether the sewing thread passes through the thread clamping device, and check the synchronous operation of the bobbin cam. If there is any problem, readjust it according to the standard;
- If the needle and bending needle are not matched properly, check the needle bar height and the synchronization between the needle and the bending needle. If there is any problem, readjust it according to the standard;
- The needle and the needle guard rod are not matched properly. Check the position of the needle and the needle guard rod;
- Improper matching of machine needle and tension needle or wrong position of tension needle will cause the upper decorative line to jump. Check the matching size of machine needle and tension needle, and check the output of tension needle.
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