Harris Corporation

Picker Corporation

Harris-intertype Corporation

John M Manring

Algirdas J Krygeris

An apparatus for remote control of a printing press having a plurality of printing units each having a number of ink fountain key actuators, avoids duplication of remote control circuitry and of wiring by multiplexing a small number of remote controls and control wires. Command data are produced at a remote station, and temporarily stored there. Command data for all of the printing units which are to be controlled are then transmitted as a serial data stream over a pair of wires to storage registers located at the printing press. Thereafter, all of the actuators are energized in accordance with the data stored in their respective registers. A complete serial data stream is transmitted to the press once for each AC cycle of the power line frequency, and the actuators move in accordance with every such transmission of data. After a predetermined time interval, during which the identical serial data stream is repeatedly transmitted, the command data which is stored at the remote control station is replaced by freshly computed data, and the entire cycle is repeated.

Multiplexing of actuator control signals

A system and method are disclosed for sensing and controlling the operation of a transaxial reconstruction tomographic apparatus having a movable radiation source for directing radiation through a subject and a radiation detector movable synchronously with the source in an orbital path about the subject to detect radiation emerging from the subject. The system includes circuitry and apparatus including an optical incremental encoder for producing index signals indicating when the detector passes predetermined locations in its orbital path, a frequency multiplier is responsive to the encoder for producing other more frequent signals indicating by interpolation the relative location of the detector with respect to the locations delineated by the index signals. Processing circuitry produces signals defining the boundaries of segments of the orbital scanning path, according to a scan segment magnitude and orientation indicated by the computational apparatus. The computational apparatus cooperates with the imaging apparatus for producing the image by separately treating discrete portions of information produced by the detector as it traverses respective segments of its orbital scanning path as indicated by occurrence by the frequency multiplied signals. The frequency multiplication ratio between the frequency multiplied signals and the index signals is maintained constant by phase lock, loop feedback circuitry. The loop includes circuitry to control grossly the frequency of the frequency multiplied signals as a function of the speed of the detector (indicated by index signal frequency) while a phase comparator makes relatively small adjustments to maintain a constant frequency multiplication ratio between the index and frequency multiplied signals.

Position indicating control method and apparatus in radiation scanning

A method for compensating measurements of optical density of ink printed by a printing press in which amounts of light reflected from a printed test patch area and from an adjacent unprinted reference area are measured. The measurement sensitivity of sensing apparatus for measuring light from the printed test area need not be equal to the measurement sensitivity of sensing apparatus for measuring light from the unprinted reference area because the relative sensitivities of the two sensing apparatuses are ascertained before the press starts printing. The relative sensitivities are ascertained by making preliminary measurements of light from areas known to have equal reflection densities, for example unprinted paper. The results of these preliminary measurements are stored in a memory and employed later automatically to compensate density measurements based on readings made by the two sensing apparatuses while the press is printing.

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Cleveland Heights, OH, United States of America

John M Manring