JPS6413342A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To prevent fluctuation in the feed quantity of a sheet on the side of a pinch roller from influencing the conveyance of the sheet to be conveyed by forming a hard layer on a surface of the elastic pinch roller to make the surface smooth for reduction in the coefficient of friction between the pinch roller and the sheet. CONSTITUTION:Since a driving roller 13 has a roughened peripheral surface, and a pinch roller 14 has a rubber peripheral surface made slidable by chemical treatment, the coefficient of friction mu1, between the driving roller 13 and a recording paper 3 and that mu2 between the pinch roller 14 and the paper 3 have relationship represented by the formula of mu1>mu2. Thus, when the pinch roller 14 has relationship represented by the formula a>b between outside diametral dimensions a, b near both its ends, difference in the peripheral speeds of the roller 14 at both its ends acts to make the recording paper 3 move obliquely, but since the coefficients of friction of both the rollers 13, 14 have the relationship represented by the formula of mu1>mu2, the recording paper 3 is moved under control based on rotation of the roller 14 to generate a slip corresponding to the difference in the peripheral speeds of the roller 14 on both its ends on the side of the roller 14 for preventing its skewed movement. In addition, even when the roller 14 is unbalancedly fitted on both its ends to generate fluctuation in its feed quantity, the recording paper 3 slips in the same way as above- mentioned, and can be therefore conveyed under control based only on rotation of the roller 13 for preventing oblique movement.