| 摘要 |
The mobile frame system is provided with a control circuit, which contains an actual safety circuit section in order virtually to exclude accidents in operation of the travelling frame. Each of the travelling frames (1 to 4) carries a release key (F1 to F5) to be actuated before displacement of a frame and a direction transmitter (S1 to S4) and position switch arrangements (E1 to E4) actuated by the travelling frame as a function of position. The safety circuit section (HSK), common to all travelling frames (1 to 4), contains a relay which monitors the frame movement time and two mutually locked auxiliary relays. One of these serves to make the travel control electricity circuit (y) ready for operation and, in the event of interruption of travel, blocks any further movement of the frame, while the other, after renewed actuation of the release key (F1 to F5), permits onward movement of the frame via the position switch arrangement (E1 to E4). <IMAGE>
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