| 摘要 |
Electrically controlled dérailleur. It comprises an electric motor 1 associated with a speed reduction gear 2 which drives a cam 17, bringing about the deformation of the parallelogram made up by the arms 11 and 12, which leads to the translation of the chain guide 4 required for changing gear. The control of the movement is performed by a potentiometer securely fastened to the cam 17 which is placed in a slaving loop. <IMAGE>
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