Single Needle Lockstitch Machine Working Mechanism

Single needle lockstitch machine: These kinds of sewing machines
are generally used for sewing fabric, leather, etc. particularly one
that uses two threads such as an upper and a lower thread. Figure-1
shows the single needle lock stitch machine. The one side of the needle
has the eye and a sharp tip while the other side is attached to a needle
bar that moves up and down to form a stitch.