A roller for supporting a material according to an embodiment of the present invention includes: a rotation shaft; a pipe having a space in which the rotation shaft is inserted; a deforming part that is connected to the rotation shaft and the pipe to deform the pipe; and a support part that is installed at the pipe to support the material. The deforming part includes: a thread portion provided on the rotation shaft; a nut part screwed to the thread portion; an inclined part that is disposed at an inner surface of the pipe and that is pressed by the nut part according to rotation of the rotation shaft; and a driving source that is connected to the rotation shaft to rotate the rotation shaft.

An additive fabrication apparatus with an efficient reversal mechanism to reverse the orientation of foil guiding rollers is contemplated. To this end, according to an aspect, a foil guiding system comprising: a flexible foil guiding roller; and a bearing system arranged to bear said guiding roller, said bearing system comprised of end locking elements axially locking to the roller; a bearing arrangement defining a bearing position having the roller curved in bearing engagement. The bearing arrangement engages with an outer face of said roller in a manner so as to thereby flex the roller between at least two bearing positions in conformity with a rolling direction. The flexible roller in connection with the outside bearings replaces a fixed shaft arrangement of the prior art, which is easily tunable to the foil movement direction.

A print media moving apparatus includes a web guide positioned immediately upstream relative to a roller. The web guide has an arcuate surface including three sections with the second section located between the first and third sections. The arcuate surface includes a peak in the second section. The roller, having a diameter and rotational axis, includes three sections with the second section located between the first and third section as viewed along the rotational axis. The diameter of the roller in the first and third sections is greater than in the second section. The three sections of the web guide correspond to the three sections of the roller such that the contour of the arcuate surface causes the print media, after leaving the web guide, to contact the first and third sections of the roller prior to contacting the second section of the roller.

A medium transport device 6 includes a feed out section 2 that feeds out a medium 3 that is wound in a roll shape, a main roller 8, formed of a single body that applies a feed force to the medium in the transport direction F, a plurality of sub rollers 9 arranged at a distance D from each other along the longitudinal direction of the main roller 8, wherein the sub roller 9 that rotates while nipping the medium with the pair with the main roller 8. the intermediate section 17 in the longitudinal direction of the main roller 8 is disposed at a downstream position in the transport direction F with respect to the end sections 23 and 24.