| 摘要 |
PURPOSE:To prevent the misalignment of a pressing plate and to attain a satisfactory cleaning by installing an engagement part preventing the misalignment of the plate by engaging with the pressing plate outside the rotating area of a disk. CONSTITUTION:The pressing plate 13 pressing a cleaning member is formed with a synthetic resin, and a pressing part 14 and an extending part 17 make approximately a T-shape. A collar part 32 is formed in the vicinity of the pressing part 14, and can be engaged with the step part 15 of a plate pressing port 7. On the other hand, a misalignment preventing rib 18 is protrusively installed outside the rotating area of the disk in upper and lower cases 1a and 1b so as to enclose the extending part 17. If the plate 13 is positioned at the pressing port 7, the collar part 32 engages with the step part 15 to execute retention, and the extending part 17 is inserted into the rib 18 to prevent misalignment. Accordingly the misalignment of the plate 13 is prevented, and a satisfactory cleaning is executed.
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