| 摘要 |
PURPOSE:To make it possible to perform accurate weighing by eliminating an error due to the charging of static electricity, by inserting a conductive material in a container having grains to be sorted housed therein and earthing said conductive material. CONSTITUTION:The grains supplied from a charging port 7 are sent to the lower part of an inner cylinder 4 through a supply passage 8 and transferred upwardly from the lower part by the spiral screw 5 of a screw conveyor 6. Irregular grains are excluded from the inner cylinder 4 in such a state that grains reached the upper part of the inner cylinder 4 by the rotation of the conveyor 6 and only regular grains remain in the inner cylinder 4. A reel 21 rotates to a direction unwinding a conductive material 17 with the opening of a shutter 16 by the shaking of a shutter lever 19 and the conductive material 17 is unwound downwardly to be suspended so as to be extended into a container 26. Therefore, even if static electricity is generated in the container 26 with the falling of grains, said static electricity is discharged by the conductive material 17 through an earthing wire 18. As a result, the detection error of the wt. detection sensor 27 in a platform scale 3 causing static electricity can be prevented.
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