Original convey apparatus with last original detection sensor

An original convey apparatus, comprising:

• an original tray for resting originals thereon;
• original supply means for supplying the originals from said original tray toward a reading position disposed downstream in a conveyance direction from said original tray;
• a plurality of original detection means for detecting whether any of the originals have not yet been supplied from said original tray to the reading position, said plurality of original detection means being disposed at different positions corresponding to varying original sizes;
• and
• original size information means,
• wherein selection of one of said original detection means is dependent on the original size information, and wherein said plurality of original detection means includes a plurality of lever means corresponding to varying original sizes for being rested on an original stack on said original tray and capable of being freely dropped when all of the originals have been supplied from said original tray, and
• a motor for rotating said plurality of lever means onto the original stack.

An image forming apparatus in which, when a first original to be recorded is on a platen, and when a second original succeeds the first original, a first recording sheet corresponds to the second original, and a second recording sheet succeeds the first recording sheet, wherein the second recording sheet is utilized only if it is detected that a further original to be recorded succeeds the second original, said image forming apparatus comprising:

• a tray for stacking the originals thereon;
• supply means for supplying the originals from said tray downstream in a supply direction toward said platen;
• first detection means, for detecting a trail end of a last large-sized original to be supplied by said supply means from said tray toward said platen;
• and
• second detection means, disposed downstream in the supply direction from said first detection means, for detecting a trail end of a last small-sized original to be supplied by said supply means from said tray toward said platen.

An original supply apparatus, comprising:

• an original stacking tray for stacking originals thereon;
• separate and supply means for separating the originals on said original stacking tray and supplying separated originals one-by-one to an intermediate position;
• convey means for conveying the originals from the intermediate position to a waiting position where the originals await recording;
• first detection means disposed at a first position such that, when a last large-size original from said original stacking tray is conveyed by said convey means to the waiting position, a trail end of the last large-size original passes through said first detection means;
• and
• second detection means disposed at a second position such that, when a second-from-last original is conveyed by said convey means to the waiting position, a trail end of the second-from-last original passes through said second detection means, but a trail end of a last original on said original stacking tray has not passed through said second detection means.