Sheet feeding machine

A combination comprising a main sheet feeding machine for feeding first recording sheets and a sub sheet feeding machine detachably attached to said main sheet feeding machine for feeding second recording sheets, said main sheet feeding machine including:

• a sheet feeding table which is vertically movable and capable of supporting said first recording sheets thereon, and
• first sheet feeding means situated above said sheet feeding table, said first sheet feeding means being capable of feeding said first recording sheets successively from a topmost sheet as said sheet feeding table with said first recording sheets stacked thereon moves upward,
• said sub sheet feeding machine including:
• a base body detachably attached to said sheet feeding table, said base body supporting said second recording sheets thereon, and
• second sheet feeding means situated on said base body and feeding said second recording sheets successively from a bottommost sheet so that when said base body is attached to said sheet feeding table, said first feeding means operates as conveying means for conveying said second recording sheets fed by said second sheet feeding means.