| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a belt drive transmission device capable preventing degradation of drive transmission power. <P>SOLUTION: In this belt drive transmission device, a tension adjustment mechanism 4 for adjusting tensile force of a transmission belt 3 wound between a drive pulley 2 and a driven pulley includes: a tension roller 6A for imparting tension to the transmission belt 3 by abutting on the back face 3b of the transmission belt 3 in normal rotation of the drive pulley 2; a tension roller 6B for imparting tension to the transmission belt 3 by abutting on the back face 3b of the transmission belt 3 in reverse rotation of the drive pulley 2; and a roller holder 7 keeping the tension roller 6A and the tension roller 6B in rotatable conditions, and arranged to be capable of changing over an abutting state to a separating state and vice versa of each of the tension roller 6A and the tension roller 6B on/from the back face 3b of the transmission belt 3 by rocking in a direction orthogonal to rotary shafts of the tension rollers 6A, 6B. <P>COPYRIGHT: (C)2012,JPO&INPIT |
