SEWING MACHINE AND HOOK SYSTEM FOR A SEWING MACHINE

摘要

A hook device for a sewing machine and the sewing machine are provided to improve degree of freedom of a design to reduce effort required for the design of the hook device. A hook device for a sewing machine includes a hook(12) in which a bobbin case(21) is provided and a case lifter(33). The case lifter includes a lifter lever can be supported by a lift cam of the bobbin case and a sensor(37) contacting with a control curved surface(39). The case lifter is mounted on an axis line(35) vertical on the axis line of the hook. The control curved surface includes various radial distance from the axis line of the hook.