초록 ▼

The invention relates to a combination weighing system for non-uniform weight items which comprises a plurality of hoppers that selectively empty by means of gates into a chute, and then usually into a packaging machine. The system further comprises check weighers associated with each hopper and a c

The invention relates to a combination weighing system for non-uniform weight items which comprises a plurality of hoppers that selectively empty by means of gates into a chute, and then usually into a packaging machine. The system further comprises check weighers associated with each hopper and a combination selection and machine control logic which typically receives weight signals from the check weighers and sends discharge signals to predetermined gates so as to combine items in order to achieve a nominal weight between a predetermined minimum weight and maximum weight. The improvement comprises a set point determining circuit which includes logic blocks to establish a changeable set point within the range of the maximum and minimum weights. The logic blocks allow weights below a set weight and/or maintenance of an overall average weight for the output of the system. The logic blocks may also permit setting of a percentage by count, or by weight, of weighment discharges below a set weight as well as permitting the setting of intervals between weighment discharges below a set weight. Feedback of selected weights from the combination selection and machine logic may be monitored to determine maintenance of user set parameters.

대표청구항 ▼

In a combination weighing system which comprises a plurality of hoppers each having a discharge gate and an associated check weigher, a chute communicating with said hoppers, and a combination selection and machine control logic for receiving weight signals from the check weighers and for sending di

In a combination weighing system which comprises a plurality of hoppers each having a discharge gate and an associated check weigher, a chute communicating with said hoppers, and a combination selection and machine control logic for receiving weight signals from the check weighers and for sending discharge signals to selected discharge gates, the combination selection and machine control logic being adapted to receive upper weight and lower weight input signals and also adapted to provide a cycle complete output signal, the improvement which comprises providing a maximum weight signal and a minimum weight signal, and a changeable input signal between the maximum and minimum weights, said changeable input signal being determined by a set-point determining circuit which receives said maximum weight signal or said minimum weight signal and a nominal weight signal, and which includes computing means for providing said changeable input signal to the combination selection and machine control logic between said maximum or minimum weight signal and said nominal weight signal.