Abstract: The present invention provides an image forming apparatus with a supply roller for supplying a sheet, a supply path for directing the sheet to an image forming section, a sheet ejecting path for the sheet on which an image is formed at the image forming section toward an ejecting section, a space integrally formed in a lower part of a body of the image forming apparatus, a branch path branched from the sheet ejecting path and adapted to direct the sheet toward the space, an introduction path for directing the sheet from the space to the supply path, and a sheet re-feeing unit removable with respect to the body of the image forming apparatus and including a sheet re-feeding path having an entrance facing the branch path and an exit facing the introduction path.

Abstract: A fuel injection control system for use in an internal combustion engine having a catalyst in its exhaust path. Each cylinder is provided with a fuel injection valve for injecting fuel thereinto amounting to a reference injection quantity which is set according to a loaded state of the internal combustion engine. Each cylinder is also provided with a spark plug for producing spark ignition therein at each period of reference ignition timing which is established according to the loaded state of the internal combustion engine. The fuel injection control system is provided with a controller which controls the fuel injection valve such as to increase and decrease the reference fuel injection quantity by a different amount per cylinder without a change in the total of the reference fuel injection quantity, and which also varies this fuel increase and decrease according to the loaded state of the internal combustion engine.

Abstract: The present invention provides an image forming apparatus having a first image forming unit incorporating an image formation processing device therein, a sheet supply station for feeding a sheet to the first image forming unit, and a sheet ejecting station for ejecting the sheet on which an image is formed by the first image forming unit out of the image forming apparatus. Wherein a second image forming unit having the same function and size as those of the first image forming unit is mounted within the image forming apparatus and a sheet inlet of the second image forming unit is directly connected to the sheet ejecting station.