| 摘要 |
PURPOSE:To prevent deflection of a transmission pitch, by turnably supporting curved tensioners along the peripheral surfaces of transmission wheels, further urging the curved tensioner to the transmission pitch and adapting the curved tensioners about to loose end prts of center angles in the winding transmission pitch. CONSTITUTION:Curved tensioners 7 are adapted to a winding transmission pitch 3 throughout about loose side end parts t1, t2 of winding center angles theta1, theta2 of the winding transmission pitch 3. The curved tensioner 7 is provided integrally with a pair of foots 7a, 7a, and the foots 7a are fitted to circular arc grooves 8a of tensioner guides 8, concentrically with transmission wheels 4, 5, and turnably supported along the peripheral surfaces of the transmission wheels 4, 5. Further the tensioner 7 is constituted by a concaved arc surface 71, of diameter almost equal to a peripheral arc surface of the transmission pitch 3 wound to the transmission wheels 4, 5, and a protrusively curved surface 72, gently continued to said concaved surface 71, and the both surfaces 71, 72 are almost fully press contacted to the transmission pitch 3 by a spring 9. |
