Rotary hook for sewing machines
AssigneeHirose Manufacturing Co., Ltd.
InventorTokuzo Hirose
Life of this patent
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Abstract
A front section of a hook point member, relative to a rotating direction, of a rotating hook assembly is replaceable. The member can be replaced with a new one when a hook point is worn. Also, the replaceable member is made of a material of high hardness, such that burr-like edges will not be formed, thereby making it possible to obtain good sewing performance for a long period of time. The hook point and a claw may be formed integrally and can be replaced when the hook point and/or the claw is worn.
Claims15
In a rotating hook assembly including a rotating hook body to be rotated about an axis of rotation in a direction of rotation, said rotating hook body including a cylindrical wall coaxial with said axis, said wall having formed therein a cut-out opening, and a hook point at said opening and facing in said direction, the improvement comprising:
- said opening being at least partially defined by a planar surface of said rotating hook body;
- a hook point member having a planar surface and an end defining said hook point and being formed of a material of high hardness;
- said hook point member being detachably mounted on said rotating hook body with said planar surfaces in mating abutment and with said hook point defining end facing in said direction and extending axially beyond a free axial end of said rotating hook body;
- and
- said hook point member having longitudinally extending outer and inner edges that project radially outwardly and inwardly, respectively, of outer and inner surfaces of said cylindrical wall of said rotating hook body, said outer and inner edges being curved.
Dependencies are inferred from the claim text.