| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of holes for a journal, by using both a hole for a push bolt used for removing a journal attached in a roller shell and a hole for tightening bolt used for attaching a journal in common. SOLUTION: A screw for accepting the push bolt is screwed in and fixed in the hole for of the tighten bolt provided in the roller shell, when the journal currently fixed to the roller shell is removed from a roller shell. The push bolt is screwed in the hole prepared for the tighten bolt in the journal along which the tighten bolt passes, and the head of the screw for accepting the push bolt is poked and pushed to pull the journal apart from a roller shell. By using both the screw hole in which the tighten bolt has a play and the hole in which the push bolt is crewed in, the number of holes necessary for making holes in the journal is lessened.
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