Digital weighing method
AssigneeAcurex Corporation
InventorsEmiel De Senerpont Domis, Robert M. Cadwell
Life of this patent
Estimating the term…
Abstract
A checkweigher uses a strain gauge load cell to provide a digital count which in turn is utilized to provide for automatic rezeroing and simplified referencing. The "grey zone" is taken into account for 100% rejection. Give away weight and standard deviation are also automatically determined.
Claims26
A weighing method where a weighing cell is responsive to moving items passing over an associated weight table and produces a digital count related to the weight of an item on the weight table comprising the following steps:
- initially while no item is on the weight table determining an average zero count;
- thereafter storing a digital count corresponding to a reference weight;
- running said items over said weight table, sensing said digital count for each item and, taking into account said average zero count, comparing such digital count to said reference weight count;
- and while no item is on the weight table again determining a new average zero count as in the first step.
A weighing apparatus comprising:
- a weighing cell responsive to moving items passing over an associated weight table to produce a digital count related to the weight of an item on the weight table such count ranging from substantially zero with no item on said table to a full scale count with an item of maximum capacity on said table;
- means for classifying items into at least two classes including means for storing in digital form a number related to a desired boundary for classifying said items and for comparing said stored number with said digital weight count such boundary number being related to a reference weight passed over said weight table.
A weighing method where a load cell is responsive to items passing over an associated weight table and produces a digital count related to the weight of an item on the weight table comprising the following steps:
- initially while no item is on the weight table sensing in successive intervals of time a predetermined plurality of digital counts and averaging said counts to provide an average zero count;
- thereafter passing a reference weight over said weight table at least once, sensing the resultant digital count for each pass, and storing at least the digital count corresponding to the heaviest pass;
- running said items over said weight table, sensing said digital count for each item and, taking into account said average zero count, comparing such digital count to said heaviest pass count of said reference weight;
- and while no item is on the weight table again determining a new average zero count in accordance with the first step.
A weighing method where a load cell is responsive to items passing over an associated weight table and produces a digital count related to the weight of an item on the weight table comprising the following steps:
- initially while no item is on the weight table sensing in successive intervals of time a predetermined plurality of digital counts and averaging said counts to provide an average zero count;
- thereafter passing a reference weight over said weight table at least once, sensing the resultant digital count for each pass, and storing at least the digital count corresponding to the lightest pass;
- running said items over said weight table, sensing said digital count for each item and, taking into account said average zero count, comparing such digital count to said lightest pass count of said reference weight;
- and while no item is on the weight table again determining a new average zero count in accordance with the first step.
Dependencies are inferred from the claim text.