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FOUR-BAR SLOTTED-LINK THREAD-CATCHING MECHANISM

Gear 1 rotates about fixed axis A. Link 2, carrying the guiding hook for the thread, turns about fixed axis B. Link 2 slides in guide 3 whose axis of rotation is in gear 1. When gear 1 rotates at uniform velocity, link 2 rotates at nonuniform velocity.
$1467$LG,FD$