| 摘要 |
PURPOSE:To eliminate the need for pulling-out operation for a crown for the purpose of correcting-digit selection by counting correction pulses and carrying them up by way of a counter which is reset at fixed periods. CONSTITUTION:When a switch S3 is turned on, a correction gate 18 is opened, and the correction pulses through a switch S1 turning on and off according to turning of a crown, a chattering preventing circuit 14, and a differentiating circuit 15 pass through an AND gate 23 or 27 which is selectively opened via a T type FF11, whereby a minute counter 4 or data counter 6 is corrected. On the other hand, these correction pulses are counted by a counter 16 which is reset at prescribed periods, and an FF17 is set at every prescribed interval, by which the opening states of the gates 23 and 24, 27 and 28 are inverted and an hour counter 5 or a month counter 7 is corrected, thus the carry-up at the correction is accomplished without making carry-up selection by pulling out the crown, and the time is corrected by the simple operation without any malfunction. |
