초록 ▼

Disclosed herein is an automatically controlled weigh feeding apparatus including a container for prefilling with a substance, a device for discharging the substance from the container at a controllable rate, apparatus for weighing the substance being discharged and for producing an electrical signa

Disclosed herein is an automatically controlled weigh feeding apparatus including a container for prefilling with a substance, a device for discharging the substance from the container at a controllable rate, apparatus for weighing the substance being discharged and for producing an electrical signal proportional to that weight, a voltage to frequency converter connected to receive the electrical signals, a digital computer, apparatus coupled to an output of the voltage to frequency converter for inputting data signals to the digital computer, the computer being adapted to compute a corrective signal based on the input data signals received, and coupling apparatus coupled between the computer and the device for discharging the substance from the container for controlling the rate of discharge responsive to the corrective signal.

대표청구항 ▼

A weigh feeding machine comprising a container for a substance; discharge means for discharging the substance from the container at a controllable feed-out rate; means for producing a first electrical signal corresponding to the desired feed-out rate; means for sensing the weight of at least the sub

A weigh feeding machine comprising a container for a substance; discharge means for discharging the substance from the container at a controllable feed-out rate; means for producing a first electrical signal corresponding to the desired feed-out rate; means for sensing the weight of at least the substance in the container and for producing a second electrical signal having a characteristic which is proportional to the value of said weight; means for sampling said second electrical signal during each of a succession of time intervals; means for computing a feed-out rate from signals derived from said sampling and for comparing an electrical signal representative of said computed feed-out rate with the first electrical signal, and for producing, as a result of said comparison, a control electrical signal indicative of the desired changes, if any, in the feed-out rate of the discharge means; control means for controlling the discharging means in accordance with said control electrical signal to thereby maintain the feed-out of the substance from the container at the desired feed-out rate; and means for comparing a signal derived from at least one sample taken during one of said time intervals with a signal derived from at least one sample taken during another of said time intervals, for repeating said comparison for successive time intervals, so that the signal derived during each of said successive time intervals is compared with a signal derived during a different time interval, and for inhibiting the action of the control electrical signal on the control means when said comparison shows a difference between the compared signals beyond a predetermined limit.