pawl
Speech parts
1. pawl - Noun
2. pawl - Verb
Meaning
A pivoted tongue, or sliding bolt, on one part of a machine, adapted to fall into notches, or interdental spaces, on another part, as a ratchet wheel, in such a manner as to permit motion in one direction and prevent it in the reverse, as in a windlass; a catch, click, or detent. See Illust. of Ratchet Wheel.
To stop with a pawl; to drop the pawls off.
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Examples
A later design implemented a rolling cylindrical pawl called a "nut" to retain the string.
As this ring rotated with its rotor, a notch machined into it would eventually align itself with the pawl, allowing it to engage with the ratchet, and advance the rotor on its left.
Here, the middle rotor (2) is engaged because the notch in the first rotor is aligned with the pawl; it will step (turn over) with the first rotor.
When the pendulum swings away from its normal plumb position due to sudden deceleration or rollover, a pawl is engaged, the reel locks and the strap restrains the belted occupant in position.
The right-hand pawl, having no rotor and ring to its right, stepped its rotor with every key depression.
The third rotor (3) is not engaged, because the notch in the second rotor is not aligned to the pawl, so it will not engage with the rachet.