Electronic weighing apparatus

Details Electronic weighing apparatus Electronic weighing apparatus

G - Physics

01

G

265/5

G01G 23/18 (2006.01) G01G 19/40 (2006.01) G01G 19/44 (2006.01) G01G 19/46 (2006.01) G01G 23/36 (2006.01) G01G 23/375 (2006.01)

Patent

CA 1129447

ABSTRACT OF THE DISCLOSURE An electronic weighing apparatus comprises a slit plate displaceable in association with the weight of an article placed on a weighing pan. A photosensitive device is provided in the vicinity of the slit plate for generating a train of pulses responsive to the slits in association with the displacement of the slit plate. The slits are provided on the slit plate such that the pulses are obtained from the photosensitive device only if an when the amount of displacement exceeds that corresponding to a predetermined weight. The slit plate is further provided with a magnetic shield plate at a position before the photo- sensitive device intially detects the slits, when the slit plate is displaced. A permanent magnet and a reed switch are provided facing each other through the slit plate at a mechanical zero point, such that the reed switch is turned on if and when the slit plate is displaced and the magnetic shield plate is removed from the mechanical zero point, whereby various components of the electronic weighing apparatus are energized by a battery. The pulse train obtained from the photosensitive device is counted by an up/down counter, which is initially loaded with the data asso- ciated with the above described predetermined weight, when the reed switch is turned on. Accordingly, the up/down counter starts counting the pulse train, starting from the above described initial count value associated with the above described prede- termined weight.

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