Patent ID: 9152118
Filing Date: 2015-10-06
Classification: B65H,G03G

Abstract:
1. A sheet conveying apparatus comprising: a sheet conveying unit that conveys a sheet including a conveying amount measuring unit that measures a conveying amount of the sheet conveyed by the sheet conveying unit by measuring the number of pulses generated by the rotary encoder as a rotation amount; a first detection unit positioned downstream of the sheet conveying unit and detecting passing of a front end portion of the sheet downstream of the sheet conveying unit in a conveying direction of the sheet, the first detection unit being positioned apart from the drive roller and the driven roller not to overlap with the drive roller and the driven roller in the conveying direction, in a plan view; a second detection unit positioned upstream of the sheet conveying unit and detecting passing of a rear end portion of the sheet upstream of the sheet conveying unit in the conveying direction of the sheet; and a conveying distance calculation unit that calculates a conveying distance of the sheet based on the measured result by the conveying amount measuring unit and the detected results detected by the first detection unit and the second detection unit, wherein the distance between the first detection unit and the drive roller and the driven roller is set based on a conveying speed of the sheet and a resonance frequency of the one of the drive roller and the driven roller to which the rotary encoder is provided such that the first detection unit is capable of detecting passing of the front end portion of the sheet after velocity turbulence generated by insertion of the sheet between the drive roller and the driven roller converges.