Image reading apparatus and image forming apparatus

摘要

A driving device is used in an image reading apparatus, and reciprocates a scanning unit for reading an image on an original. The driving device comprises a pull member, a driving pulley which transmits driving force to the pull member, a following pulley which applies tension to the pull member and a pulley holder having a pulley axis which holds the following pulley rotatably. Then, the pulley axis has a lock pawl capable of locking an upper end portion of the following pulley and canceling engagement with the following pulley by being tilted toward a side of an axial center by elastic deformation. Furthermore, the lock pawl is arranged at a side of a tension acting direction from the pull member to the following pulley except the farthest position from the driving pulley among positions in a circumferential direction of the pulley axis. It is possible to attach and detach the following pulley easily at a time of maintenance or the like.

主权项

1. An image reading apparatus that comprises an original platen and a scanning unit for reading an image on an original put on the original platen, comprising:
a guide shaft that guides reciprocation of the scanning unit; a pull member that is arranged at a front side than the guide shaft, and pulls the scanning unit; a driving pulley that transmits driving force to the pull member; a following pulley that the pull member is wound thereon while keeping a state where tension is applied to the pull member; and a pulley holder having a pulley axis that holds the following pulley rotatably, wherein the pulley axis has a lock pawl that can lock the following pulley and cancel engagement with the following pulley by being tilted toward a side of an axial center of the pulley axis by elastic deformation, and the lock pawl is arranged at a side of a tension acting direction from the pull member to the following pulley among positions in a circumferential direction of the pulley axis and at a position except on a line extending from the axial center of the pulley axis to the tension acting direction.