| 摘要 |
<p>PROBLEM TO BE SOLVED: To store compactly before use and prevent the occurrence of wear dust in use, by making cavities between a front shaft-support part and a roller support part and a rear shaft-support part and a barrier wall. SOLUTION: A roller support part 11, in which a particular number of shallow, circular grooves matching roller outside-diameter and length are parallelly contiguous with each other, are formed in the bottom of each dishlike recess area 1. A front shaft-support part 12 and rear shaft-support part 13, having rows of recesses into which both ends of shafts are inserted, are formed in front of and behind the roller support part 11. Further, a cavity 14 is made between the roller support part 11 and the front shaft-support part 12, and a cavity 15 is formed between the rear shaft-support part 13 and a rear barrier- wall 2. The cavities 14 and 15 have flat bottoms, and when two trays 100 are superimposed alternately in the directions of the front and rear, the bottoms of the cavities 14 and 15 of the upper tray 100 come into contact with the upper surfaces of the shaft support members 13 and 12 of the lower tray 100.</p> |
