| 摘要 |
A pulley arrangement for a compound archery bow ( 100 ) that combines the forgiveness and symmetry of a "dual cam" system with the positive draw stop (hard wall), enforced synchronization (or built-in timing) between opposite pulley assemblies, and high let-off associated with "single cam" systems. The pulley rigging ( 112 ) includes only a single cable reference anchor to a limb ( 104, 106 ). Certain pulleys ( 108, 110 ) include rotating module portions ( 183, 214 ) effective to change the wrapped lengths of power and control cables ( 270, 272 ) to change draw length (L<SUB>D</SUB>) while the bow ( 100 ) is strung, and at a brace condition with the drawstring ( 116 ) under full tension, and without changing the timing of the pulley members ( 108, 110 ), or changing the lengths of rigging members ( 112 ). Certain embodiments include a resilient element ( 196 ) in a positive draw stop ( 194 ) to reduce noise as the draw stop ( 194 ) engages a rigging element ( 270 ). A resilient element ( 206 ) adapted to reduce drawstring vibration may further be included, in one or more pulleys, and arranged to contact the drawstring ( 116 ) as the pulleys ( 108, 100 ) over-rotate. A preferred mounting arrangement employs a flanged bearing assembly ( 200 ) to resist bearing walk relative to the pulley on which the bearing assembly ( 200 ) is installed. Certain preferred embodiments of pulleys ( 108, 110 ) include a spiral cam shape at a let-off portion of the string cams ( 150, 210 ).
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