| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a traction speed reducer contributing to reducing the size and cost of an image forming device requiring a number of motors by allowing output rotation to be taken out of input rotation at a high reduction ratio without connecting planetary speed reducers in multiple stages. <P>SOLUTION: The traction speed reducer comprises a sun roller 51 as an input shaft, an internal ring 53 formed in an annular shape and fixed in the peripheral direction, a plurality of planetary rollers 52 rotated in association with the rotation of the sun roller 51 and each having an input side roller portion 52a and an output side roller portion 52b different in outer diameter, the input side roller portion 52a being held between the outer peripheral face of the sun roller 51 and the inner peripheral face of the internal ring 53, an output ring 55 formed in an annular shape and rotatably supported in the peripheral direction for pressing against the output side roller portions 52b of the planetary rollers 52 so as to encircle them at their outsides, and an output shaft 54 to be rotated together with the output ring 55. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
