Disk 1 rotates about fixed axis A and has grooves a and b along which sliders 2 and 3 move. Sliders 2 and 3 are connected by turning pairs to connecting rod 4. When disk 1 rotates, connecting rod 4 imparts reciprocating motion to slider 5 and to needle 6 which is rigidly secured to slider 5.
$1465$LG,FD$