| 摘要 |
PROBLEM TO BE SOLVED: To make the deviated amount of a back-up roller uniform in a shaft direction and to improve the paper feeding force of a center part in the shaft direction by inserting a solid metal shaft having a pair of large diameter parts mutually separated into the hollow cylinder of the back-up roller. SOLUTION: A heat roller 12 is rotatably attached at a frame 10 through bearings 14 and 16. The solid metal shaft 6 is inserted into an aluminum allay hollow cylinder 24 at the back-up roller 22, and the elastic body 38 of rubber or the like is lined on the hollow cylinder 24. The shaft 26 possesses a pair of the large diameter parts 26a and 26b having a diameter slightly smaller than the inside diameter of the hollow cylinder 24 and mutually separated. The shaft 26 is rotatably attached at the frame 10 by a pair of the bearings 28 and 30. The shaft 26 is pressed at both end parts in the direction of the heat roller 12 by coiled springs 32 and 34. The shaft 26 is brought into contact with the hollow cylinder 24 only by a pair of the large diameter parts 26a and 26b. |
