3 clothes go back and forth

When sewing fabrics, there are often cases where the fabric moves back and forth, that is, one step forward and one step backward. This is caused by the too high feed dog teeth. The plane of the teeth exposing the needle plate is too high, and the teeth are always exposed to the outside of the needle plate to reciprocate, causing the cloth to move back and forth. When adjusting, loosen the lifting crank screw and gently press the tooth down with a screwdriver to lower the feeding tooth to the standard height, that is, the tooth is exposed to the 0.8-1 mm size of the needle plate, and then tighten the crank screw.

4 clothing back

In the sewing work, sometimes the cloth does not move forward, but instead moves toward the operator, that is, the cloth material is retracted. This failure is caused by the misalignment of the upper shaft crank and the cam eccentric screw. The teeth can move forward in a rhythmically. It is entirely driven by the feed cam. Because the cam itself is eccentric. Therefore, the fork is moved forward and backward, and the fork further drives the feeding shaft and the dental frame to promote the reciprocating motion of the teeth. It can be seen that the eccentric position of the cam is very important.

The standard angle of the upper shaft crank and the cam screw. As long as the angle between the cam screw and the upper shaft crank is adjusted to 260-300, the cloth will not be retracted.

When adjusting, pull the back cover of the machine head down, you can see the feeding cam, insert the screwdriver into the inside of the casing, loosen the feeding cam screw, and then turn the screw to the upper shaft and turn it into 260-300. Position and tighten the cam screw.