The accurate feeding action of the interlock sewing machine can reduce the probability of stitch skipping. The main aspects of the machine that affect the feeding action are closely related to the height of the feeding dog, the pressure of the presser foot, the differential feeding, the stitch density, and the speed of use.
The main theory to put forward this is: the stability of the triangular thread loop on the back of the looper depends on the stability of the cloth feeding action and the correct coordination of the thread take-up cam. If the feeding action is unstable, the triangle thread loop will be deformed or it will be large and small so that the needle cannot enter the triangle thread loop.
The principle to be mastered when adjusting the height of the feed dog is that when the feed action is completed, the feed dog must return completely from under the needle plate, and no movement that causes the sewing material to retreat is allowed.
The presser foot pressure should ensure that the sewing material does not slip to the operator's side.
When the sewing material with large elasticity or the force of the operator pulling the sewing material into the arms is too large, the differential feeding amount should be increased.
The small stitch length of the triangle loop is also small, so the density should be appropriate, and if possible, it should be large rather than small.
Too fast will cause the sewing material to float or not be pressed by the presser foot instantly, which will affect the stability of the thread loop.
