Sheet conveying apparatus, image forming apparatus, sheet conveying distance calculation apparatus and sheet length calculation apparatus

摘要

A sheet conveying apparatus includes a sheet conveying unit that conveys a sheet; a conveying amount measuring unit that measures a conveying amount of the sheet conveyed by the sheet conveying unit; a first detection unit that detects the sheet downstream of the sheet conveying unit in a conveying direction of the sheet; a second detection unit that detects 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.

主权项

1. A sheet conveying apparatus comprising:
a sheet conveying unit that conveys a sheet; a conveying amount measuring unit that measures a conveying amount of the sheet conveyed by the sheet conveying unit; a first detection unit that detects the sheet downstream of the sheet conveying unit in a conveying direction of the sheet; a second detection unit that detects 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 sheet conveying unit includes
a drive roller which is driven to be rotated by a driving unit,a driven roller which is rotated in accordance with the drive roller while the sheet is interposed between the drive roller and the driven roller, anda rotary encoder provided on a rotational axle of one of the drive roller and the driven roller, the conveying amount measuring unit measures the number of pulses generated by the rotary encoder as a rotation amount, and the distance between the first detection unit and the one of the drive roller and the driven roller is set to be larger than three times a value obtained by dividing a conveying speed of the sheet by a resonance frequency of the one of the drive roller and the driven roller.