Abstract: An ink jet printer includes a rotatable support for supporting a sheet of paper, a rotary drive for rotating the support, and an ink jet print head mounted adjacent the support for printing on a sheet of paper supported thereon during a plurality of successive rotations of the support. A paper supply loads a sheet of paper onto the support such that the sheet of paper is supported thereby. A paper ejector removes a sheet of paper from the support. A control is provided which controls operation of the paper supply and the paper ejector such that as a sheet of paper is removed, after a plurality of rotations on the support, another sheet is concurrently loaded onto the support, whereby the time required for loading and unloading a sheet of paper is minimized and the overall speed of the printer enhanced.

Abstract: An ink jet printer includes a rotatable support means for supporting a sheet of paper, a rotary drive means for rotating the support means, and an ink jet print head mounted adjacent the support means for printing on a sheet of paper supported thereon during a plurality of successive rotations of the support means. A paper supply means loads a sheet of paper onto the support means such that the sheet of paper is supported thereby. A paper ejector means removes a sheet of paper from the support means. A control means controls operation of the paper supply means and the paper ejector means such that as a sheet of paper is removed, after a plurality of rotations on the support means, another sheet is concurrently loaded onto the support means, whereby the time required for loading and unloading a sheet of paper is minimized and the overall speed of the printer enhanced.

Abstract: A paper handling system capable of providing a single or multiple pass of a printing medium by an ink jet printing head for the reproduction of original documents utilizes an endless conveyor belt to support the printing medium. The belt can be driven both forwardly and in reverse to cycle the printing medium under a printing head which prints tracks of information onto the medium. After each cycle, the printing head is advanced in a direction transverse to the motion of the printing medium until complete coverage of the printing medium is achieved. Either an interlace or band printing scheme can be used.

Abstract: An ink receiving aperture is provided on the printing sheet support medium for an ink jet copier. At startup, excess flushing fluid, ink, and ink blobs which may be expelled from the jet array are caught in the trough and removed. The ink catching aperture avoids the need to mechanically displace either the printing head or the print support medium during startup.

Abstract: Exposure control for an image projecting system, particularly for a projection system in which an image is projected from an illuminated object plane through a lens and onto an image plane of a copier of the full frame exposure type. Illumination means are employed for illuminating an object plane. Transducer means, preferably in the form of a photosensor, are provided in the light path and on the image side of a lens for primarily sensing the intensity of the light incident on the image plane. The transducer means produce an output signal which varies in accordance with the intensity of the projected image, and integrating means coupled to the transducer are adapted to produce a time integral output signal of the intensity of the illumination sensed by said transducer means. Means are further provided for discontinuing the illumination of the object plane by the illumination means when the time integral output signal reaches a predetermined level.