Title: Copy-repeater arrangement and method of adjusting the same

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Abstract: A pair of cylinders is rotated in synchronism; each cylinder has a mark on its periphery and the marks are to be moved to angular coincidence. A train of counting pulses is derived from a train of timing pulses which controls the drive of one of the cylinders; when a signal is generated as the mark of this cylinder passes a fixed point, this counting pulse train is applied to a forward-reverse counter to make it count backwards from a reference value. As soon as the signal indicative of the passage of the mark on the other cylinder is generated, the counting pulse train is cut off and a pulse train derived from it but of stepped-down pulse frequency, is applied to the counter to make the same count forward to the reference value. During the forward counting, and until the reference value is reached again, the train of counting pulses is modified by adding or suppressing timing pulses, until the next signals from the one and the other cylinder indicate angular coincidence of the marks.


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