A mechanism has revolute pairs1–2,2–3,3–4 and a prismatic pair1–4, as shown. Which link must be fixed to obtain the quick-return inversion commonly used in a shaper?
Fixing link2 establishes the two fixed pivots needed by the crank-and-slotted-lever quick-return inversion of the single-slider chain. The driving crank rotates uniformly while the slotted lever traverses unequal crank angles for forward and return strokes. Thus B.
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