Patent ID: 7281678

Claim:
A decurl unit that eliminates curl of roll paper, said decurl unit comprising: a roll paper holder that holds roll paper, which is wound in a cylindrical roll, in an axially rotatable manner; a conveyance roller that feeds the roll paper drawn out of said roll paper holder; a curl elimination roller that comes in contact with the roll paper drawn out of said roll paper holder to apply tension onto the drawn-out roll paper in a decurling direction, said curl elimination roller being axially rotatable; and a shift mechanism that presses said curl elimination roller to bring said curl elimination roller substantially into contact with a cylindrical face of the roll paper wound in the cylindrical roll, and moves said curl elimination roller to approach a roll paper shaft of the roll paper with a decrease in remaining amount of the roll paper, said shift mechanism being a tension spring that is spanned between said curl elimination roller and said roll paper shaft or its periphery.