| 摘要 |
A thread cutting device for a sewing machine of chain sewing includes a fixing plate, a combine plate on the fixing plate, a slide guider movably combined with the combine plate by a swing arm located between the fixing plate and the combine plate. A main knife is fixed on a front end of combine plate, and a movable knife is fixed on the slide guider to be moved moved back and forth by the slide guider so that the movable knife may hook and retract threads for the main knife to cut off when the swing arm is swung by an air pressure cylinder having its piston rod connected with an second end of the swing arm, while a first end of the swing arm is connected with the slide guider.
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