An automatic overlay device is disclosed having a web for carrying a multiplicity of overlays. Individual overlays can be extended over a photocopying area by drive motors. A sensor is provided for counting markings on the web to indicate the number of overlays on the web, the sensor issuing a signal and the overlay device having a non-volatile memory responsive to the signal from the counting sensor for storing information concerning the number of overlays. Controls on the automatic overlay device allow a user to select a desired overlay, the arrangement being such that the motors move the web to expose the desired overlay in response to a signal from the control and comparison of the signal from the controls with information stored in the non-volatile memory.
A system and method are disclosed for controlling a registration overlay. The method comprises estimating a state using moving horizon estimation and determining an input of the registration overlay using the state. The system comprises an estimator configured to determine a state using moving horizon estimation; and a regulator configured to determine an input of the registration overlay using the state.
