摘要:
PROBLEM TO BE SOLVED: To prevent inks from adhering to shape imparting rollers each of which has a large outer diameter and imparts a predetermined shape to paper.SOLUTION: A paper discharge roller 11 at a paper discharge unit 7 of an image forming apparatus has an upper roller 20 serving as a drive roller and a lower roller 21 serving as a driven roller. The lower roller has a nip roller 22 fixed at a shaft 24 to hold paper between itself and the upper roller, and shape imparting rollers 23 stay free with respect to the shaft, have diameters larger than that of the nip roller, and reside at both sides of the nip roller. Because a transporting speed of paper which is held and transported is constant, the number of revolutions of the nip roller having a small outer diameter is smaller than the number of rotations of the shape imparting rollers each having a large outer diameter. The friction of shape imparting rollers to the paper is reduced in comparison with the case that, in a prior art, ink adhesion and accumulation is suppressed, and trouble such as paper contamination by ink upon paper discharge hardly occurs.
摘要:
PROBLEM TO BE SOLVED: To provide a sheet transport apparatus that can suppress the inconvenience of sheet deflection by a bending member (especially, abnormal noise generated when the sheet is transported in a curved transportation path) while securing the stacking performance of a sheet, and to provide an image forming apparatus including the sheet transport apparatus.SOLUTION: The sheet transport apparatus 300 includes a sheet transport part 30 that transports a sheet P in a first transport direction Y1 and a second transport direction Y2. The sheet transport apparatus includes: a bending member 210 that bends the sheet P by corrugating the sheet P in an orthogonal direction; a restriction member 220 that restricts, in a perpendicular direction z, corrugation in the sheet P that is bent by the bending member 210. The restriction member 220 is provided closer to an upstream side in the first transport direction Y1 than an end in a vertical direction Z of the bending member 210.
摘要:
PROBLEM TO BE SOLVED: To provide an image forming device capable of restraining the occurrence of carrying failure when paper passes through a switchback passage, while having the stiffness applying function, with a simple constitution. SOLUTION: A paper ejecting unit of this image forming device includes a first passage 103 for ejecting paper to an external part, a second passage 104 for refeeding the paper to an image forming unit when double-sided image forming processing is applied, a paper carrying part 40 for carrying the paper toward the external part from the first passage 103 and constituted so that the paper can be inversely carried toward the second passage 104, and a stiffness applying member 47 for applying stiffness to the paper by deforming the paper in a waveform when the paper carrying part 40 carries the paper. An upstream side passage part 53 of the second passage 104 is set narrow in a width D in the thickness direction of the paper to a degree capable of relieving the waveform of the paper when the paper passes through the upstream side passage part 53. COPYRIGHT: (C)2011,JPO&INPIT