Image forming apparatus including with opposite first and second walls and with first and second drive and transfer systems mounted respectively to the first and second walls

摘要

An image forming apparatus includes: a driving source including only a first driving motor and a second driving motor; a first transfer system that transfers a first driving force generated by the first driving motor; and a second transfer system that transfers a second driving force generated by the second driving motor. The first transfer system transfers the first driving force only to each image carrier and each developing roller. The second transfer system transfers the second driving force to at least a belt driving roller of an intermediate transfer unit, a fixing roller, and a sheet conveyance roller.

主权项

1. An image forming apparatus, comprising:
an imaging system including a plurality of combinations of image carriers and developing devices, each of the image carriers having a circumferential surface for carrying a developed image thereon, each of the developing devices having a developing roller for supplying developer onto the circumferential surface of the corresponding image carrier; an intermediate transfer unit disposed above the imaging system and including an intermediate transfer belt on which the developed image carried on the circumferential surface of the image carrier is primarily transferred and a belt driving roller for driving and running the intermediate transfer belt; a developer container disposed above the intermediate transfer unit and including a container body that stores developer to be supplied to each of the developing devices and a developer feeder disposed in the container body; a fixing unit including a fixing roller; a sheet conveying system including a sheet feeding section for feeding a sheet on which the developed image is to be secondarily transferred from the intermediate transfer belt, a sheet discharge section that receives a sheet on which the developed image has been secondarily transferred, a conveyance passage for guiding the sheet from the sheet feeding section to the sheet discharge section by way of the intermediate transfer unit and the fixing unit, and a plurality of sheet conveyance rollers disposed in the conveyance passage; a driving source including only a first driving motor and a second driving motor; and a first transfer system for transferring a first driving force generated by the first driving motor and a second transfer system for transferring a second driving force generated by the second driving motor; and a box-shaped body housing that houses the imaging system, the intermediate transfer unit, the fixing unit, and the sheet conveying system; wherein the body housing includes a first side wall and a second side wall that are opposed to each other, the first driving motor and the first transfer system are attached to the first side wall, and the second driving motor and the second transfer system are attached to the second side wall, the first transfer system transfers the first driving force only to each of the image carriers and each of the developing rollers, and the second transfer system transfers the second driving force to at least the belt driving roller, the fixing roller, and the sheet conveyance rollers and the developer feeder.