Rolled sheet conveying apparatus of plotter and rolled sheet conveying route control method.

Abstract

In a paper sheet conveying operation for a plotter, a roller paper sheet 29 supported on a feeding roller 35 is slackened by way of rotation of the feeding roller. The suspended portion of the paper sheet is pulled up onto the platen 34 due to rotation of the drive roller 10. Then, the suspended portion of the paper sheet 29 passes through a pair of tension rollers 27 and 28 and receives weak tension from the tension rollers 27 and 28, thus preventing the paper sheet from snaking. When the tension rollers are not placed correctly in parallel to the Y-rail of the plotter, the distances of the left and right edges of the paper sheet from the tension rollers to the drive roller become unequal. Consequently, unequal tensions are generated in the opposing edges of the paper sheet when it passes between the tension rollers 27 and 28, thereby causing a discrepancy in the conveyance of the paper sheet 29. Solving the problem, a route length control mechanism is provided on the supporting portion of the tension rollers 27 and 28. As a result, the distances of the left and right edges of the paper sheet between the tension rollers 27, 28 and the drive roller 10 can be controlled and made substantially equal.

Dependencies are inferred from the claim text.