STITCH BALANCING THREAD TENSION DEVICE-RELEASING DEVICE FOR SEWING MACHINE
PURPOSE:To hold a stitch balancing thread tension device under a non-operating condition even when a holder lifting lever is lowered as long as the holder lifting lever is raised at one point when a thread is set by providing an operation cam which synchronizes with a main shaft and has positions to...
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Format: | Patent |
Sprache: | eng |
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