| 摘要 |
PURPOSE:To completely prevent the occurrence of accident by exactly confirming set positions by using a system in which only the lamps on both ends, among lit lamps to display an automatic slewing range set by a setter, are set to a displaying condition different from the others. CONSTITUTION:An operating panel 16 is provided with left- and right-side setting switches (b) and (c) and a deviation-correcting switch (a). A large number of lamps R to display on automatic slewing range set by a setter are circularly set in parallel under a condition that angles to the vehicle body of a slewing base are displayed in cooperation with a pointer 24A in order to form a displayer 24. A device allowing only the lamps Rn and Rn' on both ends are also set on the positions of left and right-handed set stopping points and allowed to make flickering operation periodically. Since the working condition can visually be confirmed in a short time at each set time, the occurrence of trouble can completely be prevented.
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