Inner bobbin case holder of a fully rotating hook
AssigneeHirose Manufacturing Co., Ltd.
InventorsTokuzo Hirose, Kiyoshi Nakamura
Life of this patent
Estimating the term…
Abstract
A bobbin case holder body and a track projection portion are made of steel. A coating member of a liquid crystal polymer is integrally molded to the outer surface of the track projection portion so as to have a thickness t which is selected to be 0.3 to 0.5 mm. A part of the coating member is fitted into a groove formed in the track projection portion, thereby preventing the member from peeling off. In a loop spreading portion, the track projection portion made of steel is exposed from the coating member so that a so-called thread handing area is prevented from being formed. Therefore, wear resistance and durability are improved.
Claims18
An inner bobbin case holder to be fitted in a rotatable outer loop taker of a full rotary hook, said inner bobbin case holder comprising:
- a body having an outer circumference;
- a track projection on said outer circumference of said body and extending circumferentially thereof between a loop spreading portion of said track projection and a thread releasing portion thereof;
- and
- said track projection comprising a portion made of metal and a coating member made of synthetic resin integrally fixed to and covering said metal portion, with a part of said metal portion at an upstream end thereof relative to a direction of rotation of the rotatable outer loop taker being uncovered and exposed from said coating member.
An inner bobbin case holder to be fitted in a rotatable outer loop taker of a full rotary hook, said inner bobbin case holder comprising:
- a body having an outer circumference having formed therein a circumferential fitting groove and a plurality of circumferentially spaced recesses extending inwardly from said fitting groove;
- a track projection member having an inner circumference having extending radially inwardly therefrom a plurality of circumferentially spaced fitting projections;
- and
- said track projection member being fitted into said fitting groove of said body with said fitting projections fitting into said fitting recesses and retaining said track projection member on said body.
Dependencies are inferred from the claim text.