| 摘要 |
<p>PURPOSE:To accurately detect the center position of a column provided to the back part of a wall panel even if the column slants by providing a tilt detecting means which detects the tilt of the column to the moving direction of a casing. CONSTITUTION:A circuit board 31, a battery B, electrode plates 11a and 11b, etc., are stored in the casing 3. Pilot lamps 27a and 27b are arranged on a straight line passing a mark 32 provided to the center part on one edge of the front surface of the casing 3 and the electrode plates 11a and 11b are arranged on a straight line which is parallel to said straight line and along the back surface of the casing 3. If the column 2 slants to the moving direction of the casing 3 when the position of the column 2 is detected, either of the pilot lamps 27a and 27b illuminates earlier. Therefore, the slanting direction of the column 2 is known from the illumination positions of the pilot lamps 27a and 27b and the distance between the centers of both electrode plates 11a and 11b.</p> |
