| 摘要 |
Automatic control circuit for entrance gate with weight-sensitive bars located on both gate sides characterised in that the weight-sensitive bar (1) located outside the room sends the control signal to the first delay stage (2), the output thereof is connected with the first counter (5), and the weight-sensitive bar (6) located inside the room sends the control signal to the second delay stage (7), the output is connected with the second counter (10), at the same time outputs of the first counter and of the second counter (5 and 10) are connected with a comparator (11) that generates a signal from one of its three outputs: A>B, A=B, or A<B, where: A - number of pulses counted by the first counter (5), B - number of pulses counted by the second counter (10). This signal goes through an amplifier (12, 13, 14), then to the logic AND (15) controlling the actuator (16) that opens the gate, or directly to the actuator (17) that closes the gate.<IMAGE>
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