Keyhole machine composition mechanism

The keyhole machine system generally consists of nine mechanisms: feeding mechanism, hook mechanism, needle bar mechanism, stretching mechanism, hook mechanism, upper knife mechanism, slide mechanism, thread separating mechanism and upper thread automatic cutting device. Each set of institutions has its own characteristics and functions, and is relatively independent, but they work closely together and coordinate with each other.
The keyhole machine generally adopts a swinging needle bar, a double looper, a double-pronged hook thread, and a double-thread overlock compound chain stitch. The elastic presser foot structure of the buttonhole machine automatically adapts to the clamping of different fabric thicknesses. The operator can easily realize sewing buttonholes of various shapes and sizes by exchanging the two cams. It facilitates handling and leaves the required upper thread length for proper seam initiation, ensuring buttonhole sewing. The machine can quickly cut first and then sew and first sew and then cut.