| 摘要 |
PURPOSE:To obtain a time correcting system which can be operated easily, by selecting successively and cyclically each state of low speed correction, correction stop, high speed correction and correction stop, by a correction switching operation. CONSTITUTION:When a clock is set to a correcting state by drawing out a stem, a switch S1 is closed, an inhibitor 41 becomes off, and also AND gates 37-40 become off through AND gates 33-36 by FFs 30-32 of a reset state. Subsequently, an input to signal forming circuits 44, 45 is cut off, and a step-motor 47 does not turn. Subsequently, when a switch S2 is set to an on-state once by turning the stem to the left, FFs 25, 32 become a set state through a differentiation circuit 22, the gate 37 becomes on through the gate 33, and the motor 47 rotates forward at a low speed by one second pulse phi from a frequency dividing circuit 18. Subsequently, when the switch S2 or S3 is turned on once again, the motor 47 stops in the same way, and subsequently high speed forward rotation, stop, etc. of the motor 47 are selected successively and cyclically. With respect to reverse rotation of the motor, too, it is executed in the same way, and a time correcting system which can be operated easily is obtained. |
