| 摘要 |
PURPOSE:To seal up a control board and to eliminate an evil effect of moisture to an electronic circuit, by constituting the electronic circuit with a contactless switch, a storage circuit using no auxiliary power supply and a driving system detecting circuit. CONSTITUTION:For a control board for an automatic loom, a contactless switch 3 is turned on to switch a driving system 1 to a driving system 3. Thus the output O3 of a driving system selecting circuit 2 is set at H level, and an input is possible to a driving system storage circuit 3. The output O1 of a storage writing control circuit 7 is changed to L level from H level with the signal C for a prescribed period. In this case, the output of the circuit 2 is stored in the circuit 3. The circuit 3 uses no auxiliary power supply even when the power supply is cut off and then stores the switch selected position. At the same time, the outputs Q and -Q of a driving system change detecting circuit 8 deliver the H and L levels respectively by the signal C. The outputs of an AND circuit 4 and an OR circuit 5 are set at L and H levels respectively. Thus the driving systems 2 and 1 are turned on and off respectively. When more time elapses, the output O2 of the circuit 7 is set at L lvel. Then the output of the circuit 8 is reset to its original state, and the output of an AND circuit 6 is set at 1. Thus the system 3 is turned on. |
