The craft of sewing using a sewing machine. Has the advantages of neat stitch, work efficiency and so on. Commonly used machine sewing techniques are as follows. ① Combined seams (including pocket seams); will be a combination of pieces of clothing sewn seized. Used for concealed sewing garment piece combination or bag cover, collar, sleeve head and other three-sided sewing flip parts. (2) Overlocking: A layer of the garment piece is wrapped around the edge of another layer of the garment piece and sewn, and then sewn for the second or third time. There is an open package, the difference between the dark package. Generally used for cloth clothing without locking the edge of the seam. ③Bite Seam: The upper and lower layers of the garment piece bite the middle layer of the garment piece, and the front seizes the bright line. Used for sleeve head, waist head, etc. Riding seam: two pieces of fabric seams (not stacked up), in the articulation of the seized W-shaped thread, so that the two pieces of fabric to hold each other firmly. Generally used in high-grade clothing interlining fabric splicing and closing. ⑤Flat Seam: Two pieces of fabrics are joined together at the seam allowance, and are complementary to each other. It is used for joining long garment parts. (6) Flat stacked seam: two pieces of fabric seams are overlapped and sewn in the center. Used for interlining fabric splicing and closing the forehead and so on. (7) to and from the sewing: the two pieces of clothing piece superposition, the first along the front of the wool mouth seized narrow seams (3cm), and then seized on the reverse side of the broad seams (about 7cm). Mostly used for single garment sewing. (8) sub-sewing: two layers of clothing piece stacked sewn, the mouth of the seam is separated, each side of the seizure of a bright line. Commonly used in the clothing is not easy to fold (such as leather) or stitch decoration. Sitting and seizing: two pieces of clothing sewn together, the seam allowance is tilted down, the front for the second seam. Often used as a fixed seam or stitch decoration. ⑩ sub-sitting seams: two pieces of clothing sewn together first, the seams will be sewn upside down seams apart, in the sub-seam seized on a bright line. Mostly used for cloth clothing, crotch seam, front sleeve seam, back seams, and so on. Pressing and seizing (boring and seizing): the upper layer of clothing piece seam folding, covering the lower layer of clothing piece, a sewing and seizing molding. Mostly used for the front and back over the shoulder or arc type, sharp angle type and other parts of the mounting. Leakage seam: the open seam line leakage in the slots or close to the edge of the sitting seam, not only can make the line hidden, but also can fix the lower layer of clothing piece. Commonly used in the installation of the waist, placket, etc.. Hemming: Use the hemming presser foot or fingers to roll up the raw edges of the garment piece. Often used in single garment or the lower edge of the garment. Reverse stitch: to and fro on the original stitch. It is used to reinforce the beginning and end of the seams, install the seal, fork seal, and install the belt loop. Modern garment processing of the main machine sewing equipment, in addition to high-speed lockstitch sewing machine (referred to as lockstitch machine), there are multi-needle multi-thread overlock sewing machine (referred to as overlock machine), as well as to replace the manual bagging, locking eyes, nail buttons, zhang barge, compound lining (clothing and lining combinations), loading sleeves, loading the waist of pants, pleats and other special machines, and multi-functional auto-speed solid-circuit electronic sewing machine came out. 1980s, the more advanced machine sewing equipment is automatic sewing machine, the sewing machine is the most advanced sewing equipment. machine sewing equipment is the automatic sewing system, the use of industrial cameras and electronic computer monitoring, can automatically identify the style of the cut pieces, transmission and automatic classification control.