| 摘要 |
PURPOSE:To read and display a cart number securely by providing the 1st-3rd sensors for generating read start and read termination signals of a read timing bolt and cart number, both of which are provided at the desired part of the cart. CONSTITUTION:Signals of the 1st-3rd sensors 4, 5 and 6 are inputted to a flip- flop (FF) circuit 8, which becomes unstable due to a read start signal from the 1st sensor 4. A binary signal cart number corresponding to a cart number from the 3rd sensor 6 is read and held. By the signal from the 2nd sensor 5, the cart number is moved to a latch circuit 9. Some parts of signals from the 2nd sensor 5 resets the circuit 8 delayed by a delay circuit 7. The cart number from the latch circuit 9 is made BCD by signals of the 1st monostable multivibrator 10 in a binary/BCD convertor circuit 12, and displayed on a seven-segment display body 14 by a seven-segment decoder 13. Moreover, an interruption signal is produced by the 2nd monostable multivibrator 11. Receiving this interruption signal, a CPU reads out the cart number from the latch circuit 9. |
