| 摘要 |
PROBLEM TO BE SOLVED: To provide an excreta withdrawing machine capable of preventing a sprocket from rustily adhere as a unit to the circumference of the output shaft of a speed reducer engaged with the sprocket. SOLUTION: This excreta withdrawing machine has such a scheme that, a rustproofing ring 60 made of copper or copper alloy material is interposed between a sprocket 20 and the output shaft 10 of a speed reducer engaged with the sprocket 20, thereby preventing, by the aid of the rustproofing ring 60, the sprocket 20 from being unable to be drawn out of the circumference of the output shaft 10 as a result of rustily adhering as a unit to the circumference of the output shaft 10 due to intrusion of water and/or saline contained in excreta in between the sprocket 20 and the output shaft 10 during operation under a very bad condition close to the excreta.
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