Patent ID: 8452196
Filing Date: 2013-05-28
Classification: G03G

Abstract:
1. A device for measuring a length of a recoding material, comprising: a rotating body that rotates in contact with a recording material which is transported; a length measuring unit that measures a length of the recording material based on a rotation of the rotating unit; a supporting unit that supports the rotating body, the supporting unit moving in a direction that follows a left side or a right side of the recording material, the left side or the right side is a perpendicular direction with respect to a paper delivering direction and along a plane of the recording material, the paper delivering direction defined by the plane of the recording material; a detecting unit that detects at least one of a rotation and an oblique advance of the recording material; a correcting unit that corrects a value measured by the length measuring unit based on an output of the detecting unit, wherein the rotation of the recording material is detected by first and second detecting units for detecting different positions of a front end of the recording material, and the oblique advance of the recording material is detected by a side end detecting unit for detecting a position of a side end of the recording material, a rocking angle detecting unit that detects an angle of the movement of the supporting unit; and a comparing unit that compares an angle of the oblique advance obtained by the side end detecting unit with the angle obtained by the rocking angle detecting unit, wherein the first and second detecting unit detects different positions of a rear end of the recording material, and the correcting unit corrects the value measured by the length measuring unit based on a result of the comparison in the comparing unit.