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In the sewing work, sometimes the cloth does not move forward, but moves in the direction of the operator, that is, the cloth moves backward. This failure occurs because the angle between the upper shaft crank and the cam eccentric screw is not correct. Therefore, the teeth can move forward rhythmically. It is completely driven by the feeding cam. Because the cam itself is eccentric. Therefore, the tooth fork is moved back and forth, and the tooth fork drives the feed shaft and the tooth frame to promote the reciprocating movement of the tooth. This shows that the eccentric position of the cam is very important.
The standard angle between the upper shaft crank and the cam screw. As long as the angle between the cam screw and the crank of the upper shaft is adjusted to the position of 260-300, the clothing will not move backwards.
When adjusting, pull the back cover of the machine head down to see the feed cam, insert a screwdriver into the casing, loosen the feed cam screw, and then turn the screw to 260-300 with the upper shaft Position, and then tighten the cam screw.