| 摘要 |
PURPOSE:To decrease the number of the keys by decreasing the number of the timer time setting keys with a combined use of these keys and also securing the multi- frequency hitting of the same key. CONSTITUTION:Keys K1, K5, K10 and K60 are provided for use in 1 minute, 5 minutes, 10 minutes and 60 minutes each. With a push of K5, the key signal is delivered from key signal short-time generator OS2, and thus the code signal is applied to adder ADD from code signal generator CG2 to be supplied to subtractor SUB after addition with the contents (0 presently) of memory unit R1. The output of SUB is supplied to zero detector circuit ZD and R1 to be displayed at display unit DIS. The information circulates R1, ADD and SUB. Time signal generator CLK operates simultaneously with the key setting to give the signals to SUB every minute for execution of the subtraction. The output of SUB is detected by ZD when it becomes zero, and thus alarm means ALM is driven. For setting of 37 minutes, K10, K5 and K1 are operated three times, once and twice respectively, and then an addition is carried out through R1 and ADD. |
