Rigidly attached constant-breadth cam 1 and crank 2 rotate about fixed axis A. Cam 1 is confined in yoke d of link 6 which is connected by turning pairs C and D to slider 7 and to link 8. Slider 7 moves along fixed guide f and link 8 turns about fixed axis E. Link 9 is connected by turning pairs F and H to crank 2 and to crank 3 which is rigidly attached to constant-breadth cam 4 and turns about fixed axis B. Cam 4 is confined in yoke e of link 10 which turns about fixed axis K and is connected by turning pair T to slider 11. Slider 11 moves along slot q of link 5 which is connected by turning pair R to link 8. When cam 1 rotates about axis A, serrated member a, mounted on link 5, grips and advances the cloth being sewn.
$3284$CmL,FD$