Device for electromechanically weighing

Claim 1

A device for electromechanically weighing which includes a support, a stationary frame, said support being operable by a weight and being adapted to be moved and guided relative to said frame in a predetermined direction, a first generator of a magnetic field of a desired strength connected to said support, a second generator for generating a magnetic field of a desired strength, said first generator being arranged within the region of said second generator, and both generators being aligned with regard to each other so that a force is exerted upon the support which acts counter to a weight acting upon said support, a contact-free operating sensing device for translating the position of said support relative to said frame into electric values, a control device operatively connected to said sensing device for controlling the strength of the magnetic field of at least one of said generators so that the support is held in a predetermined position, and indicating means for indicating the strength of at least one of said magnetic fields, link means parallel to each other and located in a plane parallel to the direction of the forces acting upon said support, said link means connecting said support to said frame, a weighing plate arranged at one end of said support, a generator for a magnetic field connected to the other end of said support, a further generator of a magnetic field arranged within the region of action of a further generator of a magnetic field which is connected to said frame, and marking means provided on said support and arranged within the region of the sensing device connected to the frame, the sensing device comprising two coil systems with two coils each connected to each other, said two coil systems being arranged with a slight gap therebetween and being located on said frame, said coil systems being geometrically coordinated to each other in such a way that the axes of one coil each of both coil systems are axially aligned to each other, said marking means arranged on said support forming a shielding plate, the length of which corresponds to the distance between the axes of the coils pertaining to one and the same coil system, oscillator means connected to one of said coil systems, differential rectifier means connected to the other coil system, amplifier means connected to the exit of said differential rectifier means, voltage-current transformer means having an inlet connected to the outlet of said amplifier means, said voltage-current transformer means being adapted at the voltage at the exit of the differential rectifier means to convey to the coil connected to said support a current corresponding to the weight on said support.

Claim 2

A device for electromechanically weighing which includes a support, a stationary frame, said support being operable by a weight and being adapted to be moved and guided relative to said frame in a predetermined direction, a first generator of a magnetic field of a desired strength connected to said support, a second generator for generating a magnetic field of a desired strength, said first generator being arranged within the region of said second generator, and both generators being aligned with regard to each other so that a force is exerted upon the support which acts counter to a weight acting upon said support, a contact-free operating sensing device for translating the position of said support relative to said frame into electric values, a control device operatively connected to said sensing device for controlling the strength of the magnetic field of at least one of said generators so that the support is held in a predetermined position, and indicating means for indicating the strength of at least one of said magnetic fields, link means parallel to each other and located in a plane parallel to the direction of the forces acting upon said support, said link means connecting said support to said frame, a weighing plate arranged at one end of said support, a generator for a magnetic field connected to the other end of said support, a further generator of a magnetic field arranged within the region of action of a further generator of a magnetic field which is connected to said frame, and marking means provided on said support and arranged within the region of the sensing device connected to the frame, the sensing device comprising two coil systems with two coils each connected to each other, said two coil systems being arranged with a slight gap therebetween and being located on said frame, said coil systems being geometrically coordinated to each other in such a way that the axes of one coil each of both coil systems are axially aligned to each other, said marking means arranged on said support forming a shielding plate, the length of which corresponds to the distance between the axes of the coils pertaining to one and the same coil system, oscillator means connected to one of said coil systems, differential rectifier means connected to the other coil system, amplifier means connected to the exit of said differential rectifier means, voltage-current transformer means having an inlet connected to the outlet of said amplifier means, said voltage-current transformer means being adapted at the voltage at the exit of the differential rectifier means to convey to the coil connected to said support a current corresponding to the weight on said support.