| 摘要 |
A bow having a string trained around a string track of a cam wherein the configuration of the string track is variable with respect to the axis of the cam. In one configuration, the string track yields a mechanical advantage when the bowstring is pulled from an at rest position to a drawn position. When the bowstring is released from the drawn position, the string track assumes another configuration. The different configurations that the string track assumes results in the draw force, that is the force required to pull the string from the at rest position to the drawn position, being less than the shooting force, which is the force imparted to an arrow by the string when the string is released from the drawn position.
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