Paper conveying device, image forming apparatus, and push-in amount adjusting method

摘要

A paper conveying device includes an intermediate transfer member and a paper conveying member driven so as to rotate at the same rotational speed, and an adjusting device. On an outer peripheral surface of the intermediate transfer member, an elastic layer is provided. An axes distance between the intermediate transfer member and the paper conveying member is adjusted by the adjusting device so that drive torque for rotating the intermediate transfer member and the paper conveying member at the same rotational speed becomes smaller than a target set value. Accordingly, occurrence of the shear is suppressed without changing a rotational speed ratio of rollers arranged opposite to each other.

主权项

1. A paper conveying device, comprising:
an image bearing body bearing an image on a surface and driven so as to rotate at a first rotational speed about a rotational axis as a center of rotation; a paper conveying member conveying recording paper, to which said image is transferred, to a nip portion formed with said image bearing body, said paper conveying member arranged so as to be in press-contact with said image bearing body and driven so as to rotate at a second rotational speed about a rotational axis as a center of rotation; a torque detecting device detecting first driving torque for rotating said image bearing body at said first rotational speed in a state of allowing said recording paper to pass through said nip portion and/or second driving torque for rotating said paper conveying member at said second rotational speed in a state of allowing said recording paper to pass through said nip portion as detection values; and an adjusting device capable of adjusting an axes distance between the rotational axis of said image bearing body and the rotational axis of said paper conveying member, an elastic layer being provided on an outer peripheral surface of said image bearing body and/or on an outer peripheral surface of said paper conveying member, and said first rotational speed and said second rotational speed have the same value or have values such that one value is an integer multiple of the other value, and said axes distance is adjusted by said adjusting device so that a sum of said first driving torque for rotating said image bearing body at said first rotational speed and said second driving torque for rotating said paper conveying member at said second rotational speed is smaller than a target set value.