| 摘要 |
A drive mechanism for converting reciprocating motion into intermittent rotary motion for use in a decimal counter or the like having an integrally molded drive member having two flexibly mounted pawls which are spring biased to insure engagement with the ratchet teeth and two fixed mounted, escapement type, driving and stopping pawls and an integrally molded, driven ratchet wheel, having two concentric rings of teeth, which in turn is coupled to the number wheels. On the impulse movement, the lower, escapement type pawl disengages a ratchet tooth whereafter, nearly simultaneously, first the rear, flexible pawl drives (pulls) the outer, larger diameter ring of teeth at the rear circumferential side thereof a portion of the first clockwise increment of rotation and then the upper, escapement type pawl smoothly engages and drives the smaller diameter ring of teeth for completion of the first clockwise increment of rotation. On the return movement, the upper, escapement type pawl disengages the ratchet tooth of the smaller diameter ring of teeth whereafter, nearly simultaneously, the front, flexible pawl drives (pushes) the larger diameter ring of teeth for a portion of the second increment of rotation and then the lower, escapement type pawl smoothly engages and drives the smaller diameter ring of teeth for completion of the second increment of rotation. And holds the ratchet wheel in a stop position until the next step of numerical value rotation during the next cycle of impulse and return movements.
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