| 摘要 |
The direction b in which drive transmission acts on a driving member 18, 19 and a coupling member 20, 21 at a coupling portion is orthogonal to the direction c in which the drive transmission acts on the coupling member 20, 21 and a driven member 83, 85 at a coupling portion. In both of the coupling portions, spaces D1, D2 are provided so that the driving member 18, 19 and the coupling member 20, 21, and the coupling member and the driven member 83, 85, can be respectively coupled to each other under a state in which mutual displacement is permitted in a direction orthogonal to each drive transmission action direction b, c.
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