发明授权
US3980032A Sewing machine having automatic feed control system 失效
缝纫机具有自动进料控制系统

Sewing machine having automatic feed control system
摘要:
Fabric lengths are monitored during and/or prior to sewing by sensing means in conjunction with a logic system. Differences in fabric ply lengths are compensated for by the logic systems control via stepping motors of the differential feed assembly located above and below the fabric plies.
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