| 摘要 |
PURPOSE:To eliminate the deflection of a matching roller and to secure the accurate matching for an aperture card onto an original placing plate, by securing contact between a rotary member and a middle position of a belt and energizing the rotary member by a spring in the direction where the rotary member presses the belt. CONSTITUTION:A tension roller 31 which applies a certain degree of tension to a belt 11 is set at the middle position of the belt 11 which is stretched between a follower puller 7 and a driving pulley 10. The roller 13 is supported rotatably to an end of a lever arm 15 which is attached rotatably to a shaft 14 fixed to the main body of a copying machine. The roller 13 presses the belt 11 by a spring 16 and with a certain level of force to apply a certain degree of tension to the belt at all times. As a result, an even level of tension is secured for the belt although the eccentricity is caused between the pulleys 7 and 10. Thus the deflecting motion is prevented for the roller 13. |
