A position adjusting mechanism, straddling a holding section for rotatably
holding rollers and an opposed holding section for holding an opposed
member disposed opposite to the rollers, wherein mutual positions between
the holding section and the opposed holding section are adjusted, whereby
mutual positions between the rollers and the opposed member are adjusted,
the position adjusting mechanism including: a revolution sustainment
structure provided at an end on one side in the longitudinal direction of
the rollers and rotatably sustaining the opposed holding section with
respect to the holding section; and a slide sustainment structure
sustained at another end on the other side in the longitudinal direction
of the rollers at two or more positions and sustaining the opposed
holding section with respect to the holding section in a slidable manner.