| 摘要 |
PURPOSE:To obtain the weight measuring device having highly accurate measuring accuracy, by providing two detecting means, which detect the deflection of a strain yielding body at both right and left sides of the free end part of the strain yielding body provided in a simplified Roberval's parallel motion mechanism, averaging the signals obtained by a detecting means, and using the result for detecting the weight, thereby eliminating shift errors perfectly. CONSTITUTION:When a material to be measured is mounted on an upper pan 3, the load is transmitted to the strain yielding body 1 through an auxiliary member 4 of the strain yielding body, and the strain yielding body 3 is deformed. When the shift errors are yielded in the directions of an X axis and a Y axis, moments owing to the shift errors act on the strain yielding body 3 through the auxiliary member 4 of the strain yielding body. The direction of the X axis is not affected because of the Roberval's parallel motion mechanism. The deformations of the deflection and torsion owing to the load simultaneously appear at the free end part of the strain yielding body 3 by the shift errors in the direction of the Y axis. Reflecting plates 5a and 5b, which are provided on both right and left sides, are displaced up and down, and light beams are projected to solar batteries at the different positions in light receiving elements 7a and 7b. The solar batteries, which generate output voltages, are judged, and the averaging operation is performed by a microcomputer operating circuit. The result is converted into a weight value and it is displayed by a display element. |
