GB1487560A - Weighing balances - Google Patents

Abstract

1487560 Weighing balance; weighing electrically OERTLING Ltd 22 Jan 1975 [22 Jan 1974] 02868/74 Headings G1N and G1W A weighing balance comprises a pivotal beam whose angular position is a measure of the load being weighed, one or more weights for suspension from the beam to alter the weighing range, control means for suspending and removing the weights from the beam, an electrical circuit responsive to operation of the control means to produce one electrical signal when a weight is added to the beam and another electrical signal when a weight is removed from the beam, reversible counting means responsive to the signals, and display means responsive to the output of the counting means to indicate the weight suspended from the beam. Weights are added to and removed from the beam by rotation of a shaft 30. Shaft 30 carries a cam 31 which operates a pair of microswitches 50, 51 which are connected to logic circuitry, Figs. 2 and 3 (not shown), to produce the electrical signals in the form of pulses. The electrical pulses are fed to a reversible counter. The balance may include a Moire Fringe arrangement for measuring the angular position of the beam which also drives the reversible counter, Fig.5 (not shown). The cam operated switches may be replaced by an optically coded disc, inductive capacitative or magnetic pickups, or Hall effect-or reed switches.