| 摘要 |
PURPOSE: An arrow shooting device is provided to prevent the distortion and bending of a body by allowing force to be applied in the same direction as the body by using a rubber band as an energy storage medium instead a limb. CONSTITUTION: An arrow shooting device includes a differential cam2, and the differential cam2 comprises a pair of outer pulleys(OP), a rubber band pulling string(IS) and an inner cam. The pair of outer pulleys has a groove into which a string(S) is inserted. The rubber band pulling string is connected to a rubber band(RB) and is fixed to a fixing point(FP). The inner cam has a spiral groove formed symmetrically. The rubber band pulling string is wound in an inner direction along the spiral groove, and the radius of the inner cam is gradually decreased toward the inner side.
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