Transporting device and image forming apparatus using the same

Abstract

The invention provides a transporting device and an image forming apparatus using the same, which are possible to effectively prevent any error detection of a side end of a sheet of paper by paper dust adhered to a detection unit. When a controller is at a starting condition (S100) of a linear sensor cleaning mode, a shift roller is made to shift towards the outer side at a paper sheet clamped state, so that tje side end Pa of the sheet of paper P moves to the positions (S140,S160) closer to the outer side than an end Ga of an image forming position and the side end Pa of the sheet of paper P when the liner sensor passes. Thus the paper dust adhered to a contact glass of the liner sensor on the side end Pa of the sheet of paper P is shifted towards the outer side and removed. And then, the shift roller is made to shift towards the outer side, thus the sheet of the paper P is shifted to a preset image formation position and the bending correction (S150,S170) of the sheet of the paper P is performed.

Description

technical field [0001] The present invention relates to a conveyance device including a mechanism for correcting the skew of conveyed paper, and an image forming apparatus using the conveyance device. Specifically, it relates to an apparatus for preventing misdetection of paper by a detection unit by effectively removing paper powder or the like adhering to the detection unit when paper skew is corrected. Background technique [0002] In recent years, multifunctional image forming apparatuses having functions of a printer, a scanner, a copier, a facsimile, and the like have been widely used. In an image forming apparatus, the paper may be skewed due to mechanical factors of the device or the like until the paper is conveyed to a secondary transfer unit where an image is transferred. Therefore, on the upstream side of the conveyance path of the secondary transfer section, a linear sensor that detects positional deviation of the paper and a shift roller that corrects the skew...

AI Technical Summary

Problems solved by technology

[0010] However, although Patent Document 1 discloses that the paper is moved in the width direction of the paper in a clamped state, there is no description about cleaning the powder adhering to the contact glass of the line sensor.

Therefore, the paper conveying mechanism and the image forming apparatus disclosed in Cited Document 1 cannot prevent false detection of the side end portion of the paper by the line sensor.

[0011] In addition, in the image recording device disclosed in Patent Document 2, since it is necessary to make the paper guide plate on the upper side where the skew detection sensor can be opened and closed, a new mechanical structure must be added.

Therefore, there is a problem that the design of the image recording device is complicated and the manufacturing cost is increased.

In addition, in the above-mentioned image recording apparatus, since the paper guide plate must be manually opened and closed during cleaning, there is a problem of increased cumbersome work.

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