Weighing system

A weighing system comprising a weighing scale for receiving product to be weighed, a compensating scale embodying the same mass and dynamics as the weighing scale, means for generating signals proportional to the environmentally induced low frequency vibrations in the scales in their weighing state, means for summing the signals so as to produce a resultant signal representing the difference in the stresses generated in the two scales, means for providing a set point signal proportional to the weight of product delivered to the weighing scale, means for balancing the differential signal against the set point signal and means operative when the differential signal equals the set point signal to terminate delivery of product to the weighing scale.

A weighing system comprising a weighing scale provided with a receptacle to receive product to be weighed, a compensating scale weighed to match the weight of the receptacle of the weighing scale, means for generating signals proportional to the dynamic stresses in each of the scales in the operative state due to environmentally induced low frequency vibrations, means for summing the signals so as to provide a resultant signal representing the differences in stresses generated between the two scales when the weighing scale is loaded with product, means for generating a set point signal proportional to the weight of product delivered into the receptacle, means for balancing the differential signal against the set point signal and means operative when the differential signal equals the set point signal to terminate delivery of product into the receptacle.

A weighing system comprising a weighing scale suspended from a strain gauge, a compensating scale of the same mass and dynamics as the weighing scale also suspended from a strain gauge, said strain gauge having identical deflection factors, a receptacle attached to the weighing scale for receiving product to be weighed, a weight attached to a compensating scale corresponding in weight to the receptacle, means for generating signals proportional to the environmentally induced low frequency vibrations developed in the strain gauges under weighing conditions, means for summing the signals so as to provide a resultant signal representing the differences in stress generated in the two strain gauges when the receptacle is loaded with product, means for generating a set point signal, means for balancing the differential signal against the set point signal and means operative when the differential signal equals the set point signal to terminate product delivery to the receptacle.

A weighing system comprising a weighing scale, a compensating scale, strain gauges, adjustable couplings suspending the respective scales from the respective strain gauges, a receptacle attached to the weighing scale, a weight attached to the compensating scale corresponding to the weight of the receptacle, means associated with the strain gauges for generating signals proportional to the environmentally induced low frequency vibrations in the strain gauges, means for summing the signals so as to produce a signal representing the difference in the stresses generated in the strain gauges, means providing a set point signal for product weight, means for balancing the differential signal against the set point signal and means operative when the differential signal equals the set point signal to terminate delivery of product to the receptacle.

The method of weighing product comprising providing a weighing scale, providing a compensating scale having the same mass and dynamics as the weighing scale, delivering product onto the weighing scale, algebraically adding the stresses developed in the two scales by environmentally induced low frequency vibrations and employing the differential to terminate delivery of product to the weighing scale.

The method of weighing product comprising providing a weighing scale for receiving product, providing a compensating scale having the same mass and dynamics as the weighing scale, delivering product onto the weighing scale, generating signals proportional to the stresses developed in the scales due to environmentally induced low frequency vibrations 180.degree. out-of-phase, adding the signals and employing the resultant signal to terminate delivery of product to the weighing scale.