| 摘要 |
PROBLEM TO BE SOLVED: To keep increase of operation torque as small as possible by generating roller pressing force in proportion to transmitting torque. SOLUTION: A first roller 1 and a second roller 2 which have centers on two parallel separate shafts a, b respectively are arranged not to get into contact with each other. A third roller 3 and a fourth roller 4 getting into contact with both of the first and the second rollers 1, 2 are arranged between the first roller 1 and the second roller 2. Angles between a tangential line of the first roller 1 and the third roller 3 (or the fourth roller 4) and a tangential line of the second roller 2 and the third roller 3 (or the fourth roller 4) are twice or less of friction angles found from a friction coefficiency between the respective rollers, and friction parts are positioned outside the rollers.
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