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US4377980A Automatic thread tensioning device for sewing machines 失效
缝纫机自动线张紧装置

Automatic thread tensioning device for sewing machines
摘要:
An automatic thread setting device for electronically controlled material and needle position type sewing machines. The device has pattern selecting means, cloth thickness designating means, upper and lower thread tension adjusting means, and electronic memory means. Selection of a pattern automatically sets the thread tension. Selection of a different pattern automatically resets the tension.
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