IS 12109 : 1987 General requirements for light duty sewing machine heads for industrial use

1 Scope

Covers the general requirements of L 12 type light dutyindustrial sewing machine head with maximum speed of 1 800 stitchesper minute and mainly used for light fabric stitching. The mainfeature being rotary hook for lower thread which operates in a fullrotary motion in a vertical plane on a horizontal axis, link-type,thread take-up and positive transmission from arm shaft to rotaryhook shaft.