| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily replace rollers with a simple structure by providing rollers on the roller shafts and by integrally mounting or dismounting common withdrawal preventing members on a plurality of rollers. SOLUTION: When rollers 1, 2 are removed from roller shafts 3, 4, withdrawal preventing members 5 can be withdrawn from the roller shafts 3, 4 and studs 10 by disengaging a claw from the annular recessed groove 10a of the stud 10 by elastically deforming an engaging member 5h in the direction of an arrow A and by pulling the withdrawal preventing member 5 in the direction of an arrow B. Used rollers 1, 2 are removed from the roller shafts 3, 4 and new rollers are fitted thereon. Next, the withdrawal preventing members 5 are pressed in the direction of an arrow C and are fitted on the roller shafts 3, 4 and the studs 10 and then the claws of the withdrawal preventing members 5 are elastically deformed in the direction of an arrow A and are engaged with the annular recessed groove 10a of the stud 10, whereby the withdrawal preventing members 5 are mounted on the roller shafts 3, 4.</p> |
