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THREE-BAR SPHERICAL SLOTTED-LINK MECHANISM OF A SEWING MACHINE

Crank 1, designed as a bent shaft, rotates about fixed axis x-x, its neck a sliding along slot b of link 2. Link 2 turns about fixed axis y-y. When crank 1 rotates, link 2 oscillates about axis y-y under the condition that the axes of all the kinematic pairs intersect at a single point.
$1463$LG,FD$