Ikea sells sy34381 sewing machine to make it? First of all, let's check whether the needle is installed correctly,It's better to change a new machine needle.2, if still not,We went on to open the needle,Turn the needle to the lowest position,Look at the rotary shuttle tip from the machine needle 8mm or so.If yes,Then raise the machine needle 2.3mm or so,Look at whether the rotary shuttle tip coincides with the machine needle center.At this time, the needle and the tip of the shuttle can not be too tight,There should be 0.1 gap.3, sometimes the needle has a little bend will also jump the needle, the easiest way is to change the needle to try, if not, when the needle is installed, try a little bit, only a little bit, otherwise, it will break the line. sometimes such a simple operation is also very effective.4. it also has something to do with the thickness of your sewing.Thick things should be thicker,If the needle is fine, it will jump,If something thin,If the needle is thick, it will also jump.5,

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Computer flat car cutting line before the needle Simple,Look at the (N) B button on the left,Represents the entrance of the needle.Then the display will display numbers,For example, 1-2-3-4-The bigger the number,The more needles you pour.C and d (N) are outlet reverse needles.Its digital control is the same.As for the automatic cutting line,There was a screw that tightened the needle,(There is only one old car) there is a big computer car,There is also a small one.Which small is to control the length of the cut line.The tighter it is, the shorter it is.(Not too long,If it can't be solved by screws,It is necessary to let the machine repair of your factory be debugged.