Patent GB-1086111-A (GB)
Title: Improved weighing apparatus coupled with price computer
IPC: G01G19/413
Filed: 1965-02-11
Abstract: 1,086,111. Weighing apparatus. T. TAKAHASHI. Feb. 11, 1965 [Feb. 24, 1964], No. 5973/65. Heading G1W. [Also in Division G4] In an arrangement comprising a weighing apparatus coupled to a digital price computing mechanism, the weighing apparatus comprises a stop which limits downward movement of a scale plate when a load to be weighed is placed thereon and a balancing system which is driven after the placement of the load on the scale plate to lift the scale plate or a carrier thereof from the stop and to be displaced towards a balanced position. The digital price computing mechanism comprises a suitably selected unit cost register which is driven by an amount correlated to the driven displacement of the balancing system to provide an indication of the price of the load in accordance with its weight. The balancing system and computing mechanism are preferably so arranged and driven for each weighing operation a rough indication of price is firstly achieved which price indication is then automatically corrected to a more accurate value. In one embodiment, a carrier 6 which supports a scale plate 5 is connected by a tension spring 9 to one end of a pivotally supported beam 2 which is linked by a roller 13 and cam 14 to a digital computer 18. When a load is placed on the scale plate, the scale plate descends to abut stops 12 and simultaneously, a lug 6a on the carrier 6 effects connection between two contacts a, b in a limit switch to actuate an electrical motor Mr. The motor M r  drives unit cost drums (43) Fig. 5 (not shown) of the computer 18 through a drive shaft 16 which drums in turn engage with and drive a price indicator mounted on a further shaft to which the cam 14 is attached. A balanced point of the weighing apparatus is achieved when the cam 14 lifts the beam 2 by such an amount as to tension the spring 9 sufficiently to lift the scale plate 5 from the stops 12, the lug 6a on the carrier then opening the contacts a, b in the limit switch thereby to stop the motor M r . A stepping device 19 comprising a cam is provided on the shaft 16 to drive the computer, when the motor M r  stops, by an amount to cause the cam 14 to lift the beam and the scale plate 5 in excess of the balanced point. A differential transformer 20 senses the excessive lifting of the scale plate 5 and accordingly actuates a motor M b  which is connected to the computer 18 by a compensating shaft 22 to drive the price indicator and cam 14 until the balanced point is restored at which time a corrected reading of a rough price indication is provided by the price indicator. When the load is removed from the scale plate 5 after the weighing operation, the carrier 6 rises due to the tension in the spring 9 and contacts b, c of the limit switch are closed by a lug 6b to start the motor M r  and to thereby drive the beam 2 back to its balanced position. The price indicator may be manually reset to zero before a further weighing operation is effected. In alternative embodiments a counterweight (9') Fig. 3 (not shown) is provided instead of a tension spring 9, a rack and pinion arrangement is provided instead of the roller 13 and cam 14, and the stepping device 19 is arranged so that the corrected indication of the price indicator is more than instead of less than the approximate price indication. The unit cost drums (43) of the computer are provided with setting pins and are so arranged on an axially movable and rotatable shaft (46) Fig. 5 (not shown) mounted in bearings (47) as to drivably engage with price indicating drums (51) of the price indicator. The shaft (46) is provided with clutches (48, 49) and is axially movable to engage with and be driven by either the driving shaft (16) or the compensating shaft 22, the axial positioning being governed by a shifter (58) actuated in accordance with the positioning of the balance beam 2.