Thread take-up lever driving device in sewing machine
AssigneeTokai Kogyo Mishin Kabushiki Kaisha
InventorsIkuo Tajima, Satoru Suzuki, Youichi Mizuguchi
Life of this patent
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Abstract
In a sewing machine having a needle bar and a shuttle driven by a main shaft and having a thread take-up lever vertically reciprocally movable in response to movement of the needle bar and the shuttle, a thread take-up lever driving device include a stroke adjusting device for adjusting a vertical stroke of the thread take-up lever in response to change of the sewing operation or in response to the material of a work fabric to be sewn.
Claims6
A thread take-up lever driving device in a sewing machine including a needle bar, a shuttle driven by a main shaft and a thread take-up lever vertically reciprocally movable for performing a sewing operation in cooperation with the needle bar and the shuttle, comprising:
- a stroke adjusting means for adjusting the magnitude of the vertical stroke of the thread take-up lever;
- and
- control means for controlling said stroke adjusting means to correspond to a pattern of stroke movement of the thread take-up lever, said pattern being determined based on a sewing condition.
A thread take-up lever driving device in a sewing machine including a needle bar and a shuttle driven by a main shaft, a thread take-up lever vertically reciprocally movable for performing a sewing operation in cooperation with the needle bar and the shuttle, comprising:
- stroke adjusting means for adjusting the magnitude of the vertical stroke of the thread take-up lever, and control means for controlling said stroke adjusting means to correspond to a pattern of stroke movement of the thread take-up lever, said pattern being determined according to a sewing condition;
- said stroke adjusting means including a cam-lever mechanism provided between the main shaft and the thread take-up lever for converting the rotation of the main shaft into the vertical reciprocal movement of the thread take-up lever, and said control means is operable to change the leverage of said cam-lever mechanism.
A thread take-up lever driving device in an embroidery machine including a plurality of needle bars and a shuttle driven by a main shaft and including a plurality of thread take-up levers, one of the needle bars and one of the corresponding thread take-up levers being driven for performing a sewing operation in cooperation with the shuttle, comprising:
- stroke adjusting means for adjusting the magnitude of a vertical stroke of the selected thread take-up lever, and control means for controlling said stroke adjusting means to correspond to a pattern of stroke movement of the selected thread take-up lever, said pattern being determined according to a sewing condition.
Dependencies are inferred from the claim text.