Computing weighing scale

Details Computing weighing scale Computing weighing scale

G - Physics

01

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265/8

G01G 19/417 (2006.01) G01G 19/414 (2006.01) G01G 23/37 (2006.01) G06F 17/40 (2006.01)

Patent

CA 1075273

WEIGHING SCALE HAVING COMMON SEQUENTIAL DISPLAY OF WEIGHT, PRICE PER UNIT WEIGHT, AND TOTAL PRICE, WITH AUTOMATIC DISPLAY SEQUENCING UPON WEIGHT CHANGE Abstract of the Disclosure A computing weighing scale has a display including single multi-digit numerical indicator driven in real time by the scale microcomputer to show, sequentially, weight of the article, price per unit weight, and total price or value of the article, and also includes function words identifying the nature of information shown to the scale operator and customer. The scale also includes weight code generating mechanism, a keyboard for entering numerical information, and the micro- computer. The indicator can also display tare weight, entered via the keyboard when no weight is on the platter. If tare is entered and subsequent weight on the platter is less than entered tare, calculating is inhibited. If platter motion is detected with weight on the platter, the display will reset to the weight indicating condition and automatically sequence to show again price per unit weight (if entered) and total price. When all weight is removed from the platter, entered tare is erased. Price per unit weight can be entered via the keyboard only when there is some minimum weight on the platter and is remembered for recalculation if weight on the platter is changed but not removed. Price per unit weight is cancelled when all weight is removed from the platter. -1- Keyboard switches are interrogated a plurality times before entered information is accepted, to assure the key entry is valid and switch contact bounce has terminated. The platter motion detector is disabled for a short time after a key actuation, to avoid system resetting as a result of platter movement which may be induced by keyboard actuation. The microcomputer scans the possible inputs from the scale and the keyboard, and sends output signal to the display, at real time rates which are compatible both with human keyboard manipulation and retention. Scale operation is divided into two portions which are called the communicate and compute cycles; the communicate cycle is usually repeated many times between compute cycles in order that real time information sensing and display operation be possible. -2-

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