"zarif" double-thread chain-stitch sewing machine

D - Textiles – Paper – 05 – B

Patent

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Details

D05B 1/10 (2006.01) D05B 15/00 (2006.01) D05B 57/04 (2006.01)

Patent

CA 2207005

The invention improves the quality of the double-thread stitch line by preventing it from unravelling from the end and also simplifies the construction and improves the productivity of the machine by the use of a simpler mechanism for the looper which executes rotary motion. The double- thread chain stitch is formed and tightened with one turn of the machine's main shaft. The sewing machine in addition contains autonomous disc-shaped cam thread tighteners for the top and bottom threads, a lifter for the bottom thread which can oscillate about its own axis. The looper is mounted in such a way that it can execute rotary motion in the vertical plane parallel to the line of stitch and can execute two rotations for each cycle of movement of the needle and lifter. With the invention, a double-thread chain-stitch sewing machine can be made in three variants with flat, columnar and cylindrical platforms respectively.

L'invention améliore la qualité de la ligne de couture double fil en l'empêchant de s'effilocher à partir de l'extrémité, elle simplifie également la construction et améliore la productivé de la machine par l'emploi d'un méchanisme plus simple pour le boucleur, lequel exécute un mouvement rotatif. Le point de chaînette double fil est formé et serré avec un tour de l'axe principal de la machine. La machine à coudre comprend également des disques de tension à came autonomes pour les fils supérieurs et inférieurs, une platine destiné au fil inférieur, laquelle peut osciller autour de son propre axe. Le boucleur est monté de manière qu'il peut effectuer un mouvement rotatif dans le plan vertical parallèle à la ligne de piqûre et il peut exécuter deux rotations pour chaque cycle de mouvement de l'aiguille de la platine. L'invention permet de réaliser une machine à coudre à point de chaînette double fil à trois variantes avec, respectivement, des plate-formes plates, en colonne et cylindriques.

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