Abstract:
There is disclosed a system for controlling the positioning of graphic information being marked on a moving document. The graphic information is marked by a row of marking elements, preferably ON/OFF switched ink jets. The marking elements are provided in sufficient number for progressively marking a band wider than the area to be marked on the document. A charge ring control register produces marking by only that number of jets required for marking the graphic information. The loading of the marking data in the charge ring control register is under the control of a margin control shift register, which in turn is loaded by the output of a series of document edge detecting photo sensors. A digital tachometer monitors the document speed and synchronizes printing with document movement. There are disclosed two alternate embodiments for providing charge ring control information. In one embodiment the information is provided by character select apparatus and a series of character matrices. In the other embodiment the information is provided by a preprogrammed tape and a tape reader. In both embodiments the information is loaded into a line control shift register and is thereafter serially transferred therefrom for loading into the charge ring control register.
Abstract:
Arrays of laterally spaced orifices, all communicating with a liquid pressure supply, all subjected to vibration at the same frequency to separate the liquid jets into streams of individual drops, provide a system for locating all of the drops with a predetermined space-time correlation by irradiating the drops in space at a predetermined time to make them visible, thus creating variable three dimensional visible shapes for study.