DEVICE FOR VARIATION OF STITCH FREQUENCY IN PROCESS OF CLOSING AT UNIVERSAL SEWING MACHINE Russian patent published in 2010 - IPC D05B27/22 

FIELD: textile industry.

SUBSTANCE: device for variation of stitch frequency in process of closing at universal sewing machine comprises spring-loaded lever that adjusts stitch frequency and is connected to controller of sewing machine stitch length, being arranged as composite with the possibility to vary its length. Its upper part has fixing ledges, which contact with controller of sewing machine stitch length, and lower part of lever is installed on base with the possibility of swinging motion.

EFFECT: device makes it possible to improve seam quality by elimination of thread connection defect in process of variation of thickness of closed packets of materials; to reduce labour intensiveness of thread stitching as stitch frequency varies in process of closing; to expand technological resources of sewing equipment; to reduce prime cost.

6 dwg, 1 tbl