Patent GB-191003750-A (GB)
Title: Improvements in Automatic Weighing Apparatus.
IPC: G01G13/00
Filed: 1910-02-15
Granted: 1911-02-09
Abstract: 3750. Winters-Coleman Scale Co., and Sonander, A. Feb. 15. Automatic-feed weighers.-Comprises the use in combination of a weighted lever adapted to aid the movement of the scale beam, but inoperative at the final cut-off, and of a supplementary scale beam, rigid with the scale beam, carrying a poise for ascertaining the weight of material in mid-air at the final cut - off. The weighing - receptacle a, Figs. 1 and 2, is suspended from a beam a<1>, which is coupled to a graduated scale beam a<9> bearing a poise a<13>. Rigid with the scale beam is a supplementary beam a<11> graduated in both directions from a central zero point. By adjusting a poise a<12>, the material in mid-air at cutoff may be ascertained and compensated for. A weighted lever a<14> assists the scale beam to rise, until, at the position of equilibrium, the lever contacts with a stop a<17>. The upward movement of the scale beam is checked by a retarding-device b, which temporarily engages the end of the scale beam, but gradually sinks under the influence of gravity into the inoperative position shown in Fig. 1. The feed and discharge gates are operated by means of a swinging pendant c, Fig. 2, pivoted to the frame bv a pin c'. The pendant carries a pawl c<2>, which engages, when moving towards the left, with adjustable stops e<3> on the weighing-receptacle, but rides over the stops when moving towards the right. When the weighing-receptacle is empty, the pawl is in engagement with the right-hand stop, but when the bulk of the material has entered, the pawl escapes and is retained by the second stop, as shown in Fig. 2. The dribble feed now completes the weight, and the pawl escapes from the second stop, this movement causing an arm c<19> on the swinging pendant to pull aside a locking- lever c<16>, thus freeing a gravity latch c<15> from engagement with a cam c<11> connected to the discharge gate by a link c<13>. The discharge gate then opens under pressure of the superposed material, and the cam c<11> swings to the left. After discharge, the discharge gate closes by gravity, and a roller c‹ on the cam c<11> engages a second pawl c<8> and swings the pendant c back to its original position. The various movements of the swinging pendant c are transmitted through an intermediate lever d<4> to a forked lever d<6>. With the pendant held by the righthand pawl c<3>, the forked lever d<6> holds open the major-feed gate e<1> and also permits the dribblefeed gate d<1> to open by gravity. When the pendant c swings to the left-hand stop c<3>, the forked lever d<6> allows the major-feed gate to close under the influence of a balance weight d<2> and finally, when the pendant escapes from the left-hand stop, the end of the forked lever strikes an adjustable shoe d<7> and closes the dribble-feed gate, sufficient lost motion being allowed between the lever d<6> and the dribblefeed gate to permit this action. The size of the dribble-feed outlet may be adjusted by means of a throttle-plate. The accuracy of the machine may be tested by raising the arm c<19> out of operative connexion with the locking-lever c<16> whereby, after a feeding operation, further action of the machine is suspended, and the weighing-receptacle prevented from discharging.