Electronic weighing apparatus of induction type
First Claim
1. An electronic weighing apparatus of the induction type comprises a weighing member adapted to be moved according to the weight of a load to be measured, a variable inductance element consisting of a coil and a magnetic core which is movable relative to said coil and through said coil, means for connecting said weighing member with one of said coil and said magnetic core of said inductance element so that said one can be moved with respect to the other according to the movement of said weighing member and thus the inductance of said inductance element can be changed proportionally to the movement of said weighing member, a sensor oscillator for generating at an output a series of pulses having a period representative of the inductance of said variable inductance element, means connected to receive said pulses and arranged for converting said period of said output pulses from said sensor oscillator into a weight signal indicative of the weight of said load, a display for receiving said weight signal from said converting means and providing an indication of the weight of said load, said sensor oscillator comprising a comparator having an inverting input terminal, a non-inverting input terminal and an output terminal and an integrator having an inverting input terminal, a non-inverting input terminal and an output terminal, said coil of said variable inductance element being connected between said output terminal of said comparator and said non-inverting input terminal of said intergrator, and said output terminal of said comparator being connected to the output of said sensor oscillator.
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Accused Products
Abstract
An electronic weighing apparatus of induction type comprises a weighing member adapted to be moved according to the weight of a load to be measured, a variable inductance element consisting of a coil and a magnetic core which is movable relatively to the coil through the coil, a connecting member for connecting the weighing member with one of the coil and the magnetic core of the inductance element so that the one can be moved with respect to the other according to the movement of the weighing member and thus the inductance of the inductance element can be changed proportionally to the movement of the weighing member, a sensor oscillator including the variable inductance element as one of its oscillating parameters for generating a series of pulses having a characteristic representative of the inductance of the variable inductance element, a converting circuit for converting the characteristic of the output pulses from the sensor oscillator into a weight signal indicative of the weight of the load, and a display for receiving the weight signal from the converting circuit and providing an indication of the weight of the load.
13 Citations
14 Claims
- 1. An electronic weighing apparatus of the induction type comprises a weighing member adapted to be moved according to the weight of a load to be measured, a variable inductance element consisting of a coil and a magnetic core which is movable relative to said coil and through said coil, means for connecting said weighing member with one of said coil and said magnetic core of said inductance element so that said one can be moved with respect to the other according to the movement of said weighing member and thus the inductance of said inductance element can be changed proportionally to the movement of said weighing member, a sensor oscillator for generating at an output a series of pulses having a period representative of the inductance of said variable inductance element, means connected to receive said pulses and arranged for converting said period of said output pulses from said sensor oscillator into a weight signal indicative of the weight of said load, a display for receiving said weight signal from said converting means and providing an indication of the weight of said load, said sensor oscillator comprising a comparator having an inverting input terminal, a non-inverting input terminal and an output terminal and an integrator having an inverting input terminal, a non-inverting input terminal and an output terminal, said coil of said variable inductance element being connected between said output terminal of said comparator and said non-inverting input terminal of said intergrator, and said output terminal of said comparator being connected to the output of said sensor oscillator.
Specification