| 摘要 |
A needle operation device in high-speed sewing machines comprising a crank integrally formed with a reciprocating shaft rotatably mounted in the machine frame of said sewing machine, an actuating arm mounted on said crank for rocking movement relative to the crank, a slide pivoted to one end of said actuating arm and having a sewing needle secured thereto and a mounting member adjustably secured to said machine frame and rotatably receiving a bearing therein, said bearing slidably receiving the other end of said actuating arm.
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