| 摘要 |
PURPOSE:To make it possible to select a large number of counters by a small number of manually operated switch by selectively correcting the content of a counter for timing hours, calendars and the like in response to the opening and closing operations of a single manually-operated switch. CONSTITUTION:A contact 12b in selected by a mode selecting switch 12, and a correction grip is drawn out by one step to close a switch 21. By this organization, a gate circuit 47 is opened, and an input of a gate circuit becomes 1. When the correction grip is turned, up and down indication outputs are generated in accordance with the rotational direction to set counters 4 through 6 to any of the modes. Simultaneously, the pulse row produced at a terminal a of a timing pulse control circuit 18 is supplied to the counter 5, and correction of date and month is made. Then, when the correction grip is depressed, the switch 21 is opened and a flip- flop 13 is reversed. When the correction grip is drawn out again and the switch 21 is closed, the content of the counter 6 is corrected. The correction of hour is carried out by selecting the contact 12a of the switch 12. |
