Symmetrical load cells for use in conjuction with rotary machines
First Claim
Patent Images
1. A weighing device for determining the weight of an object while both the weighing device and the object are placed on a rotating table, said weighing device comprising:
- at least a pair of load cells each having at least two deflectable beams, an outwardly-facing one of said pair of load cells being joined at an end thereof in series connection to an end of an inwardly-facing one of said pair of load cells, said load cells being arranged at a distance from the center of table rotation in reverse symmetry about a radial line emanating from the center of rotation, each of said load cells having a loading point integrally connected to the at least two deflectable beams, said outwardly facing load cell having its loading point further from the center than said inwardly-facing load cell; and
means in each of said load cells supported by at least one of said deflectable beams for measuring the deflection of said at least two deflectable beams and generating a proportional signal output.such that when the object to be weighed is placed so as to load said pair of load cells, said inwardly facing load cell beams deflected under the weight will produce output signals with positive errors and said outwardly-facing load cell beams deflected under the weight will produce output signals with essentially equal but negative errors, thus resulting in a summed output in which the positive and negative errors are mutually canceled to provide accurate weighing.
1 Assignment
0 Petitions
Accused Products
Abstract
A weighing device which is dedicated for use on a rotary table of rotary machine such as a rotary fluid filling machine. The weighing device includes a pair of load cells arranged in reverse symmetry with respect to a radial line emanating from the center of rotation. Due to the reverse symmetry, the deflection of each of the load cells will produce errors resulting from the centrifugal forces that will cancel each other, providing accurate weighing.
42 Citations
10 Claims
-
1. A weighing device for determining the weight of an object while both the weighing device and the object are placed on a rotating table, said weighing device comprising:
-
at least a pair of load cells each having at least two deflectable beams, an outwardly-facing one of said pair of load cells being joined at an end thereof in series connection to an end of an inwardly-facing one of said pair of load cells, said load cells being arranged at a distance from the center of table rotation in reverse symmetry about a radial line emanating from the center of rotation, each of said load cells having a loading point integrally connected to the at least two deflectable beams, said outwardly facing load cell having its loading point further from the center than said inwardly-facing load cell; and means in each of said load cells supported by at least one of said deflectable beams for measuring the deflection of said at least two deflectable beams and generating a proportional signal output. such that when the object to be weighed is placed so as to load said pair of load cells, said inwardly facing load cell beams deflected under the weight will produce output signals with positive errors and said outwardly-facing load cell beams deflected under the weight will produce output signals with essentially equal but negative errors, thus resulting in a summed output in which the positive and negative errors are mutually canceled to provide accurate weighing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification