| 摘要 |
PURPOSE:To suppress stably the surfacing of a platen glass, by burying magnets in the flange of a bearing on the side of the flange part of a rotation shaft and bringing closely the rotation shaft into contact with the bearing by their magnetic force. CONSTITUTION:A flanged bearing 12 mounted on a scan table 10 of a copying machine for film, a hollow rotation shaft 18 which has a flange part 16 of magnetic materials brought into contact with a flange 14 of the bearing 12 and is fitted freely rotatably to the bearing 12, and a platen glass 22 attached onto a hollow rotation center shaft 20 of the shaft 20 are provided. The rotation shaft 18 is rotated by a wire 26 stretched on a pulley 24 of the rotation shaft 19, and the platen glass 22 and the flange part 16 constitute an aperture card table. Magnets 40 are buried in the flange 14 of the bearing 12 on the side of the flange part 16 of the rotation shaft 18, plural magnets 40 are arranged at regular angular intervals in the circumferential direction of the flange 14. |
