| 摘要 |
PROBLEM TO BE SOLVED: To improve smoothness in the rotating operation of a roller and a seizure-proof property. SOLUTION: In a structure where a roller 4 is rotatably mounted on the outside diameter of a spindle 3 hung on through holes 12A, 12B of a pair of side walls 6, 7 of a barrel body 2, a lubricant reservoir (recess 16) is formed on the end face of the roller 4. Whereby an oil film is formed of a lubricant in the lubricant reservoir (recess 16) between one end face of the roller 4 and the inner face of one of the side walls 6 (or 7), even when one end face of the roller 4 is pressed to the inner face of one of the side wall 6 (or 7) and kept into contact therewith in a slipping state. Whereby the frictional resistance of the sliding contact part is not increased, and the generation of heat can be inhibited. COPYRIGHT: (C)2004,JPO
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