Addressograph Multigraph Corporation

Manoj C Adhikari

Joseph G Gardner

An improved printing apparatus control system regulates the operation of a sheet feed assembly which sequentially moves sheets of material to and from a printing station and a plate feed assembly which sequentially moves printing plates to and from the printing station. A photocell detects initial movement of a leading end portion of the printed sheet of material away from the printing station under the influence of the sheet feed assembly. This photocell is also utilized to detect when the printed sheet of material has completely exited from the printing station. A second photocell detects the presence of the succeeding sheet of material at the printing station. The control system also includes a sensor which detects the removal of one printing plate from the printing station, the absence of a printing plate at the printing station, and the subsequent arrival of the next succeeding printing plate at the printing station. Part way through each operating cycle of the printing apparatus, the control system performs a checking operation to make sure that the sheets of material and printing plates have been properly fed to and from the printing station. In the event of a misfeed of either a sheet of material or printing plate, operation of the printing apparatus is stopped.

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Wickliffe, OH, United States of America

Manoj C Adhikari