| 摘要 |
<p>A zero-point calibration is provided in a combination weighing apparatus which has buckets storing masses subject to selection in combination processing and including only weighing buckets (33), only auxiliary buckets (36) or both of them. The system comprises: means (1) for detecting a timing at which a number of buckets subject to selection in the next cycle becomes definite; another means (2) calculating the number of buckets from which the masses are discharged in the next cycle, by computing possible combinations of selected buckets, based on the timing detected by the detecting means (1); a further means (3) effecting a predictive calculation of a number of buckets from which the masses have been discharged at the latest cycle and which are subsequently subject to selection in the cycle after the next cycle, based on the number of buckets calculated by the calibration calculating means; and a still further means (4) changing states of buckets from their inactive states for blank weighing in zero-point calibration into their operative states for the actual weighing of masses subject to selection in the cycle after the next cycle of combination processing, whereby the number of buckets available to said cycle after the next cycle is increased if the further number of buckets prdeictively calculated is less than a predetermined number, so as to maintain an accuracy in combination at a high level.</p> |
