Patent GB-493723-A (GB)
Title: Improvements relating to the control of grain milling operations
IPC: B02C23/00
Filed: 1937-04-22
Abstract: 493,723. Automatic - - feed weighers. SIMON, Ltd., H., BRIAN, J. C., and SCOTT, J. H. April 22, 1937, No. 11549. [Class 143] [Also in Group II] In grain-milling operations, individual streams or grouped streams of certain stocks pass through an automatic weighing machine having means which control the feed of the weighbucket or the delivery therefrom synchronized or operatively connected with means which indicate or record the time taken to complete a weighing or the amount of the weighing in a predetermined interval of time, so that the average known rate of the mill feed can be checked against the production of such stocks and thereby the proportion of the mill feed converted into such stocks determined. Fig. 1 shows apparatus for indicating on a scale b the time taken to fill a weighbucket or indicate the relation to the total mill feed. The scale b is pivoted at d and is balanced by a weight c<1>. A friction wheel f is mounted on a spindle e on the scale and is driven by a wheel r geared to a synchronous motor x each time the scale is forced down-by a weighted arm z attached to an armature y<1> of an electromagnet y, the current through the electromagnet being broken each time the weighbucket feedgate is opened or the delivery door therefrom closed. The scale pointer j is loosely mounted on the spindle e and is held in position by a pawl n engaging teeth on a rack o pivoted to the scale at p. A disc g rotatable with the wheel f carries a rack release member i provided with a tumbler q adapted to strike a lug o<1> on the rack o on upward movement to release the pawl n and with a pointer h provided with a lug k adapted to engage a lug m on the pointer and thereby carry it upwardly to indicate the maximum movement over the scale. When the feedgate is opened the disc f is rotated and the tumbler q engages the lug o<1> to release the pointer j which falls and is engaged by the pointer h. The tumbler q passes above the lug o<1> and the rack falls back to engage the pawl n. Both pointers rise over the scale and when the feedgate is closed and the armature y<1> attracted the disc f is released from contact with the wheel r and the member i and pointer h falls, the tumbler q slipping over the lug o<1> so that the pointer j is retained in its position of maximum movement by the pawl n. In Fig. 3 a cam 3 driven by a synchronous motor is operatively connected by a lever 11 to the trip mechanism of a divided weighbucket 5 supported on a weighbeam 16 connected to a scale 17. A feedgate 4 is connected to a weighted lever 6 latched in the closed position by a lever 7 adapted to be tripped by a projection 8 on the cam. A second weighted lever 9 rides on the cam and moves out of the path of the lever 6 when the latter is released by the lever 7, the feedgate then moving across the shoot to close the byepass 10 and open the shoot to the weighbucket. The weight of the grain in the bucket during the time it takes for the cam to make a complete turn is recorded on the scale 17, the lever 11 being tripped at the end of the turn to permit the discharge of the weighbucket.