| 摘要 |
PROBLEM TO BE SOLVED: To provide the even quantity of the reflected light while preventing the generation of irregularity in a surface of an endless belt at a platen surface side thereof by providing an auxiliary means for assisting a non-energized part of the endless belt with the energizing force weaker than the predetermined energizing force of an energizing means. SOLUTION: A roll assembly 6 is formed of a roll shaft 63 provided in parallel with an axial direction (x direction) of a driving roll 3, auxiliary means (guide roll main bodies) 61a, 61b, 62 provided in the roll shaft freely to be rotated, energizing means (pushing roll main bodies) 60a, 60b, and fittings 64a, 64b for fitting the roll shaft 63 to a frame 10. Each pushing roll main body 60a, 60b is fitted to the roll shaft 63 while being pinched by the guide roll main bodies 61a, 61b, 62. Each fittings 64a, 64b has elasticity, and works as a plate spring to be rocked a little in a direction expressed with a large arrow, and energizes the pushing roller main bodies 60a, 60b, the guide roller main bodies 61a, 61b, 62 to the platen surface side through the endless belt 2.
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