| 摘要 |
<p>In a programming device for controlling the selective transmission of a signal to selected receivers at preselected times, commutators have their slides moved by remote control to selected commutator bars. A timing device makes connections through the commutator bars, the slide of each commutator making a connection at a different time to each different commutator bar of a given commutator. The connection made by the timing device through a commutator bar energizes a relay, which closes the circuit between the transmitter and the corresponding receiver. Parallel circuits are provided from the circuit to the transmitter to energize the transmitter only when at least one of the receivers is connected to receive. The individual commutators may each be brought to a home position also by remote control. The commutators may be mechanically driven by a motor or may be driven by stepping motors.</p> |
