An industrial sewing machine is primarily a complete system composed of four moving parts. The front end is the needle-punching section, which uses a needle to pierce the fabric and gradually tighten it to form a loop. The thread take-up section continuously supplies thread to the needle-punching section and quickly retracts the loop during take-back. The hook-up section uses knotted threads on the front of the rotary hook shaft before starting work. The feed section quickly supplies fabric to the machine head after each sewing cycle. The presser foot tightens the fabric and adjusts the stitch spacing. All these actions are coordinated and synchronized by the mechanical mechanisms within the sewing machine, ensuring smooth sewing operations. All these movements require a single component: the shaft.
Based on the type of shaft required by different sewing machine models, they can be divided into straight shafts and crank shafts. Straight shafts are mostly used in flatbed sewing machines, while crank shafts are mostly used in overlock and coverstitch sewing machines. Based on their function, shafts can be classified into upper shafts, lower shafts, and vertical shafts.
Upper Shaft
Vertical Shaft
Lower Shaft