Patent ID: 8461562

Claim:
A web transport apparatus transporting a sheet web by using multiple rollers, comprising: a driving roller transporting the web; an angle adjustable roller disposed adjacent upstream of the driving roller in a transportation direction, provided with a shaft adjustable in a shaft direction; imaging means for picking up an image of the web transported on the angle adjustable roller; alignment adjusting means for adjusting the angle of the shaft of the angle adjustable roller; and a controller, wherein the controller comprising: image analyzing means for finding a linear pattern of a waveform as a sign of wrinkling generated on the web from the image picked up by the imaging means, and for analyzing an entering direction of the linear pattern into the angle adjustable roller; and shaft angle control means for controlling the alignment adjusting mean on the basis of the entering direction of the linear pattern into the angle adjustable roller, whereby the web is not wrinkled.