| 摘要 |
A rotary printing roller holds thereon a printing form having a plurality of circumferentially spaced printing sections. A counter roller cooperates with the printing roller, and one of the two rollers is movable to and from a printing position closely proximal to and defining with the other roller a printing line. A cam arrangement is provided for moving the movable roller to its printing position and maintaining it in the same for selected different portions of the time required for one revolution of the printing roller, so that the number of printing sections passing through the printing line is a function of the selected time portion. Signalling lamps are provided which are energized to indicate the printing sections which have been selected for printing.
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