Drive mechanism for synchronous vertical reciprocating of the needle and oscillation motion of the looper in a swing machine

摘要

Sewing machine(10)main drive shaft(12)mounts eccentric cam drive(13)formed on rocking beam(21)delivering rocking motion to lay shaft(23) via first rocking lever(22)the shaft carrying first bevel gear(31)meshing with bevel gear segment(32)carrying bell crank(35) to convert the rocking motion of the shaft into oscillating movement of looper(372)while simultaneously second rocking lever(24)and coupling(28)reciprocate needle(25)