| 摘要 |
A base for supporting an image forming apparatus at a predetermined level is constructed by a plurality of units which have the same height and can be removably piled up on each other. At least one of the units may have a drawer and may house a function-adding device which adds a new function to the apparatus when the apparatus is supported on the unit. The device may be a paper reversing machine or an additional paper sheet feeding machine. Each device housed in the unit has a conveying mechanism and a supplying mechanis. The supplying mechanism is connected to an introduction mechanism of the image forming apparatus when the apparatus is mounted on the device, and supplies a paper sheet to the introduction mechanism of the apparatus. Each device further has an introduction mechanism, which is connected to the supplying mechanism of another function-adding unit when the function-adding unit is supported on another such unit.
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