First, adjust the needle wrench to reduce stitch, and the cloth feeding direction is horizontal. When moving forward, put down the presser foot like ordinary sewing and feed the cloth with your left hand. Then use the old sewing machine to return the needle, then use the right hand to lift the presser foot for a few stitches, and so on, forming a zigzag stitch.

1, needle height positioning

When the needle rises to the highest point, the needle tip reaches the plane of the needle plate ((2 thread, 3 thread 9- 10 mm), (4 thread left needle 9- 10 mm, right needle 8-9 mm), (5 thread chain needle 7.5-5.8 mm, hemming needle 9-/kloc-0).

2. Positioning of machine needle, lower bending needle and chain hook

When the lower looper and the chain hook swing to the leftmost position, the distances from the needle tip to the machine needle ((3 lines 3.5-4 mm), (4 lines 2.8-3. 1 mm left machine needle) and (5 lines 3.5-4 mm) are all 3-6 degrees, and the gaps between them are all 0.05mm 5.

3. Positioning of machine needle, upper bending needle and upper fork needle

When the upper bending needle and the upper fork needle slide bar reach the highest position, (the distance between the fork needle of Line 2 and the machine needle is 4-4.5 mm), (when the needle tip of Line 3 contacts with the upper bending needle, the distance between the upper bending needle and the machine needle is 4-4.5 mm), (the needle hole of Line 4 is just between the two machine needles), (Line 5 is the same as Line 3), and the distance between the upper bending needle and the lower bending needle is 0.6544.

Extended data

The hemming stitch can be divided into single thread, double thread, three thread, four thread and five thread.

1. Single stitch is a single stitch, which is mainly used to sew the edge of the blanket;

2. Double seam is a single needle double seam, which is mainly used for sewing elastic parts such as the bottom edge of elastic shirts;

3. Three-thread sewing is a single-needle three-thread stitch, which is a common stitch for ordinary knitted garments, especially for sewing some low-grade pieces;

4. Four-seam is a double-needle four-seam which is more powerful than three-seam It is used to sew pieces of high-grade clothes with high tension and strong friction, such as shoulders and sleeves, especially for sewing coats.

5. Five-thread hemming is a stitch with double stitches and five threads, which further improves the fastness and production efficiency, and is more elastic than four-thread hemming, and is often used for sewing coats and repairing underwear.