Knowledge

Carefully check and adjust the first thread clamp reasonably to ensure the looseness of the thread; adjust the height of the needle bar according to t

1. The tooth surfaces of the bevel gears are meshed at different heights, causing noise when the gears are running at high speed; loosen the bevel gea

1. The axial planes of the upper shaft, vertical shaft and lower shaft have no gap or no gap on one side, which makes the rotational force of the mach

1. Due to the loose fit between the taper surface and the taper hole of the small top screw on the feed shaft, the stitch length is generated; remove

broken needle (1) The needle is too thin and the needle is bent. (2) The stitches are too tight. (3) The gap between the needle and the looper and the

Broken thread and poor stitch (1) The machine needle has burrs or bends, and the looper tip and looper hole have burrs. (2) Suture. Poor suture qualit

1: Jump stitch (1) The needle is thin. Generally, knitted fabrics are elastic, thin in warp and weft, high in weaving density and prone to needle hole

1. Quilting guide Adjustable size for precise quilting in a quilting pattern. 2. Zigzag stitch presser foot Straight line and zigzag stitch are common

Kinematic viscosity (50 ℃), mm 2 /s 6~10 GB/T265 Acid value, mgKOH/g not more than 0.1% GB/T264; Flash point (closed), not lower than 135℃ GB/T261; Fr

1. Adjustment of the distance between the two needles This machine is equipped with two different specifications of needle frame swing cranks (227A&am

According to the purpose of sewing machines, it can be divided into household sewing machines, industrial sewing machines and sewing machines for serv

1. Wrap the cloth presser foot. The use of the wrapping presser foot can easily sew wrapping strips with a width of less than 7 mm on the edge of the