Abstract: A control for positioning an endless conveyor which is movable in a closed path, wherein there is a sequence of designatable locations along the length of the conveyor. The control is responsive to a desired conveyor position input request, which is in terms of a location of said designatable locations, to move the conveyor to the requested position. An actual conveyor position signal is supplied to the control which is indicative of a proportion of a complete traversal of the closed path by the conveyor. An indication of the actual length of the conveyor is stored in the control and is used to convert the desired position request to a desired conveyor position signal indicative of a proportion of a complete traversal of the path by the conveyor. The control then activates a conveyor drive to drive the conveyor until the actual conveyor position signal has a predetermined relationship to the desired conveyor position signal. For example, the conveyor may be driven until these two position signals are equal.

Abstract: A system for storing and thereafter cyclicly reproducing transient information including nm-element shift registers, either digital or analog, connected in cascade and operable in either (a) a data entry mode for storing transient data therein or (b) a recirculating mode for cyclicly reproducing at the output thereof the information stored therein. A clock of selectively variable frequency is provided for sampling transient information and/or shifting data through the shift register cascade depending upon whether the shift register cascade is in its data storage or its recirculation mode. An addressing circuit responsive to the clock signals for keeping track of the changing address of the stored information currently output from the shift register cascade is provided, and includes a single nm-bit counter in the form of a "divide-by-n" circuit and an "m-counter" circuit connected in series.