Automatic presser-foot lifting, automatic top & under thread trimming, and automatic speed limiting. Low investment, but obvious return of enhanced productive-efficiency.  SMALL CYLINDER(GENERAL PLAIN SEWING) INTERLOCK SEWING MACHINE  ZY 702-01CB,DIRECT DRIVE SMALL CYLINDER PNEUMATIC AUTO TRIMMER SMALL CYLINDER HIGH SPEED INTERLOCK SEWING MACHINE , ZY 702-01CB/PUT, SMALL CYLINDER ELECTRONIC AUTO TRIMMER INTERLOCK SEWING MACHINE,ZY 702-01CB/EUT