Patent GB-343271-A (GB)
Title: Improvements in automatic weight totalisers applied to conveyors
IPC: G01G11/02
Filed: 1930-01-16
Abstract: 343,271. Weighing-apparatus. BROWN, S. C., 40, Gloucester Road, North Harrow, Middlesex. Jan. 16, 1930, Nos. 1557 and 11492. [Class 143.] In an automatic weigher of the type that totalizes the weight of material carried upon a travelling conveyer, for example, such weighers as those described in Specifications 9339/95 and 3351/09, [both in Class 143, Weighing - apparatus], the weight of the load passing over the weigher is transmitted to two pendulous levers or other automatic weighing members in such a manner as to permit the load to be recorded after the completion of a weighing cycle whilst at the same time permitting the automatic weighing members to weigh continuously the oncoming load due to be recorded at the completion of the next weighing cycle. As shown in Fig. 1, the upper strand of the conveyer 1, driven from one of the end rollers, passes over rollers 3 on the weigh table 2 which in turn is supported by rods 4 from levers 5 all in usual manner. According to the invention the levers 5 are coupled by a rod 7 to a whippletree lever 8 connected at the ends to two weighing levers 10 carrying pendulum weights 13 below their fulcrums 10b. The usual weightmeasuring and recording arc 12 is pivoted between the ends 11 of the weighing levers. By this arrangement either weighing lever may be clamped to permit the arc 12 to measure its deflection and record the result, without interfering with the weighing action of the other lever. The clamping of the weighing levers is effected alternately by the action of a cam 18, Fig. 4, driven at half speed from the main cam shaft 22 and operating upon spring- pressed gripper levers 20 terminating in clamping plates 19a. As the clamping plate grips the weighing lever it simultaneously displaces a lever 23, Fig. 8, and causes a tappet 11b to project into the path of the measuring and recording arc 12 which falls into contact therewith under the control of a cam 15, Fig. 3, weighted crank arm 15a, and rod 15c. The return of the arc, that is, the measuring stroke, is effected by the continued rotation of the cam 15 and this movement is transmitted to the usual recorder through a clutch member alternately coupled to the measuring arc and to a discounting member on the same shaft, by a cam-operated lever 26. The discounting member is operated by a cam-actuated rod 27a. The cam 18, Fig. 4, for operating the gripper levers 20 is arranged to leave both weighing levers 10 free just prior to the completion of each weighing cycle. The mechanism may be re-arranged if the cam shaft 22 is rotated in the opposite direction. The invention may be applied to the mechanism described in Specification 320,966, [Class 143, Weighing-apparatus], wherein the measuring arc is adjustable and the discounting mechanism is modified. Instead of the weigh table shown in Fig. 1, there may be fitted a weigh table of the type articulated at the centre and pivoted at the ends on fixed supports. Two measuring arcs 12 operated by separate cams to record upon a common recorder may be used instead of one arc only.