| 摘要 |
In an automatic weighing machine for weighing portions of a product (1) composed of individual articles, comprising a product feeding device (2) and at least one weighing line having a vibratory conveyor and a weigh hopper (6), the vibratory conveyor comprises a first (4) and a second, vibratory chute (5) closest to the weigh hopper (6), each respective one being provided with a drive mechanism (7, 8) in connection with a control device (9). The second chute (5) is energized to vibrate at constant amplitude and frequency, while the control device (9) in dependence on the actual values of the feeding rate (v1) of the first chute (4) and the weight (Makt) of a product portion discharged to the weight hopper (6) is adapted to adjust solely the product feeding rate (v1) of the first chute (4) for discharging a substantially constant amount of product ( delta 2) per unit of time to the weigh hopper (6). In order to stop the discharge of product to the weigh hopper (6) the control device (9) supplies stop signals to both drive mechanisms (7, 8) at a predetermined stopping moment dependent on a desired value of portion and an arresting delay. |
