When the knife stop leve and the thread check wire are installed wrong, the knife might cut even if the thread is broken or the knife will not cut even when the needle thread is not broken. To correct these defects, first, set the height of the threaded eyelet of the thread check wire as high as permissible as long as it doesn't touch the take-up thread guide. Space in-between should be around 1 mm (1/25"). Next, pass the needle thread through the regular passing channel and fix the tension so that there will be no sagging of the thread between the take-up guide (A) and the tension thread guide No. 3. Then loosen the sci-ew so that the space Ijetween the edge of knife stop lever and the knife stop lever stop roller will be 1.5-2mm (about 1/16") and then adjust the angle of the knife stop lever. Even after the above adjustment is made, the knife does not cut when it's supposed to cut, then move the bracket of the knife stop lever to the right. Conversely, if the knife cuts even when the needle thread is cut, move the bracket of the knife stop lever to the left. When this balance is not maintained, the knife stop lever might waver up and down during the running of the machine and the knife does not cut, sometimes. Next, step on the starting pedal, push down the knife stop lever and when the knife stop lever and the knife stop lever screw washer contact each other, adjust the height of the knife stop lever stop screw washer so that the space between the tip of the stop lever and the driving bell crank finger will become l~l.5mm. When the set screw is tightened, the knife stop lever screw washer will move, so be careful and tighten the screw firmly.
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