| 摘要 |
A document feeder for an electrostatic copier of the type which includes instrumentalities for flash illuminating a document placed by an operator at the illuminating station of the copier. The document feeder includes an evacuatable enclosure having apertured upper and lower walls, and a flexible perforated belt endlessly looped about the enclosure. In addition, the document feeder includes instrumentalities for driving the belt in an endless path of travel including an upper belt run, wherein the belt perforations are disposed in air flow communication with the upper wall apertures, and a lower belt run, wherein the belt perforations are disposed in air flow communication with the lower wall apertures. When a document is delivered to the upper belt run, air drawn through the belt perforation holds the document in contact with the belt as the belt feeds the document to the lower belt run, where air drawn through the belt perforations holds the document in contact with the belt as the belt moves the document through the copier's illuminating station. Preferably, apparatus is provided for blocking movement of the document, but not the belt, through the illuminating station. During such time as the document is blocked, the moving belt slips relative to the blocked document.
|
