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RATCHET-GEAR MECHANISM FOR PERIODICALLY VARIABLE ROTARY MOTION

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Plate 1, to which pawl 2 is pivoted, is driven through gearing consisting of gears 3, 4, 5 and 6. Gear 3 is keyed to driving shaft 13, which rotates about fixed axis A, gears 4 and 5 are rigidly attached together and rotate on a fixed stud, and gear 6 is rigidly attached to plate 1 with which it rotates freely on shaft 13. The action of pawl 2 is controlled by cam surface b-b of fixed cam 8. Pawl 2 periodically engages ratchet wheel 9 which has pinion 10 at its left end and rotates freely on shaft 13. Inside ratchet wheel 9 is a free-wheeling clutch consisting of rollers 11 and core 7 which is keyed to shaft 13. Plate 1 rotates at a much higher speed than driving shaft 13. When cam 8 lifts pawl 2 out of engagement with ratchet wheel 9, the free-wheeling clutch becomes engaged and wheel 9 and pinion 10 are driven directly by shaft 13 at the lower speed. As pawl 2 leaves cam 8, spring 12 brings it into engagement again with ratchet wheel 9 and pinion 10 begins to rotate at the higher speed. To obtain rotation of pinion 10 at constant velocity, pawl 2 is held out of engagement with ratchet wheel 9 by a pin inserted in a hole of the pawl and in hole a of plate 1.
$2735$RG,ML$

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Documents: Gear mechanisms  [Streambook]
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