① clothing irregular walking
In the process of using sewing machines to sew clothing, there are sometimes irregularities in the velocity of the clothes and short irregular stitches. Cloth movement depends entirely on the cooperation of the feed dog and the presser foot, so when the above irregular movement of the clothing material occurs, it can be concluded that the tooth and the presser foot have failed or the pressure is not properly adjusted. For example, the presser pressure is too small. Pressure is not tight fabric, it will cause irregular walking. At this time as long as the pressure screw to screw down to compact clothing. The presser foot is too tall to be able to hold down the material, which will cause the material to move freely or not at all. When adjusting, lift the presser foot wrench first, loosen the guide frame screw, then move the presser foot rod up and down After adjusting the distance between the presser foot and the needle board to the height of 7-8mm, then tighten the screw, and then drive to use.
There is another reason is due to loose screw teeth, running teeth left and right shaking, so that clothing can not regularly move forward. The handling method is to remove the needle plate. Tighten the two tooth screws. Tighten the needle plate installed, check the teeth on both sides, whether the edge of the needle plate groove friction, friction, will cause noise and heavy machine phenomenon, then only remove the needle plate, loosen the screws, Adjust the position of the tooth to the middle of the needle plate groove, tighten the tooth screw, and then install the needle plate.
② clothing do not move forward
Cloth movement depends entirely on the teeth. When the clothing does not move at all, only to find fault on the teeth. If the tooth position is too low, the clothing can not move forward. Adjust the first pull the nose, the tooth will crank the screw loose, and then gently lift the holder with a screwdriver to feed teeth to. On the needle plate 0.8-1 mm can be exposed. Is the standard size of teeth, as long as the adjustment to this position, the clothes can be normal walking. Finally tighten the screws. When tightening the screws, also pull the handpiece up.
③ clothing go back and forth
When sewing clothes, often there will be back and forth movement of clothing, which is one step forward, but also one step back to the phenomenon. This is due to the feed dog is too high, the tooth exposed needle plate plane is too high, the teeth always exposed outside the needle plate reciprocating motion, resulting in clothing walking back and forth. When adjusting, lift the crankshaft screw and gently press the tooth down with a screwdriver to lower the feed dog to the standard height, that is, the tooth exposes the needle plate 0.8-1 mm in size, and then tighten the crank screw.
④ clothing to back
Occasionally sewing material does not move forward in the sewing work, but instead moves in the direction of the operator, that is, the material moves backward. This failure is due to the wrong angle on the shaft crank and cam eccentric screw. Teeth so rhythm can move forward. Is entirely by feeding cam dial. Because the cam itself is eccentric. So before and after the toothed fork toggle, and the fork and fork drive the delivery shaft and the frame, to promote tooth back and forth movement. This shows that the eccentric cam position is very important.
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