Patent ID: 6478162
Filing Date: 2002-11-12
Classification: B07C,G01G,Y10S

Abstract:
A weight selecting apparatus comprising:a feed unit for continuously feeding objects to be inspected; a first weighing unit for measuring weights of the objects; a carrying means for carrying the objects fed from said feed unit to said first weighing unit one by one; an acceptability determining unit for comparing the result of weight measurement by said first weighing unit with a specific reference value to determine the acceptability of each of the objects; an ejecting chute for ejecting the objects having been subjected to weight measurement by said first weighing unit; a defective ejecting chute, branched from said ejecting chute; a reversely rotatable defective recovering/carrying device for carrying the objects fed from said defective ejecting chute; a non-defective/defective selecting shutter, provided at the branch point where said defective ejecting chute is branched from said ejecting chute, for opening/closing a port of said defective ejecting chute; a second weighing unit for calibration, which is adapted to measure weights of sampled objects having been subjected to weight measurement by said first weighing unit; and a calibration unit for comparing, for the same object, the result of weight measurement by said first weighing unit with the result of weight measurement by said second weighing unit and determining whether or not a difference therebetween is within a specific error range; wherein in a usual state, the objects continuously fed from said feed unit are carried to said first weighing unit one by one by said carrying means and are subjected to weight measurement by said first weighing unit, being subjected to acceptability determination on the basis of the measured results by said acceptability determining unit, said non-defective/defective selecting shutter is opened/closed on the basis of the determined results, the non-defective objects are ejected through said ejecting chute to be recovered and the defective objects are introduced from said ejecting chute to said defective recovering/carrying device through said defective ejecting chute to be recovered, to thereby select the objects into non-defective ones and defective ones and recover them; and at specific intervals, said non-defective/defective selecting shutter is unconditionally opened to introduce the objects having being subjected to weight measurement by said first weighing unit to said defective recovering/carrying device through said defective ejecting chute, said defective recovering/carrying device is reversely rotated to feed the objects to said second weighing unit, those of the objects thus fed to said second weighing unit are subjected to weight measurement by said second weighing unit; and for the same object, the measured result is compared with that obtained by said first weighing unit by means of said calibration unit, to perform calibration of said first weighing unit.