This mechanism uses two phases of cam motion to create a controlled stepwise rotation of the yellow star wheel. As the pink cam rises, it pushes the purple slider upward, momentarily lifting the orange pawl off the tooth and letting the mechanism reset. As the cam continues into its downward stroke, it pulls the green frame along its slot, pushing the pawl into the next tooth and advancing the star wheel by one increment. The interplay between lift, release, and drive creates a smooth indexing motion with reduced noise and impact.

Components — Pink rotating cam, purple vertical slider, orange pawl lever, green frame with curved guide, yellow star-shaped ratchet wheel, blue pivot pins, and return springs.

How it works — The pink cam rotates continuously. At the high point of its profile, it lifts the purple slider, which in turn raises the orange pawl so it disengages from the yellow star wheel. When the cam drops past its peak, the slider descends, allowing the pawl to fall back into position. On the lower part of the cam¡¯s rotation, the cam pushes the green frame forward along its slot, and because the pawl is now re-engaged, the frame¡¯s motion drives the star wheel ahead by one tooth. The frame then resets as the cam completes its rotation, ready for the next cycle. This two-stroke sequence keeps the indexing motion crisp but quiet.

Applications — Precision indexing drives, mechanical counters, step-feed systems, low-noise ratchets, and timing mechanisms where controlled single-tooth movement is essential.

Why it matters — Separating the release stroke from the driving stroke reduces shock and wear, making the ratchet quieter and more durable. It also allows gentle engagement before force is applied, improving reliability at higher speeds or lighter loads.