| 摘要 |
PROBLEM TO BE SOLVED: To attain thinning and the facilitation of assembly. SOLUTION: On thin bases 28 and 29, a recessed part 46 is formed in the prescribed depth from the upper surface, an opening part 47 for housing the downside of a roller 45 is formed in this recessed part 46, both the terminals of a supporting shaft 49, with which the roller 45 is supported so as to be rotated and flat stable planes 48 are formed on the lower surfaces of both terminals at least, are placed in the recessed part 46, and both the terminals of this supporting shaft 49 are held by a holding plate 50. |
