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Fast retail security weighing system

  • US 5,125,465 A
  • Filed: 02/04/1991
  • Issued: 06/30/1992
  • Est. Priority Date: 02/04/1991
  • Status: Expired due to Term
First Claim
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1. A retail security weighing system comprising:

  • (a) a scale sending a first signal representative of the weight being measured;

    (b) a product code input device sending a second signal representative of the product code of a purchased product;

    (c) a timing means sending a third signal indicative of time elapsed;

    (d) a product lookup table receiving said second signal and in return sending a fourth signal representative of allowed weights for a purchased product whose product code is indicated by the said second signal;

    (e) a set of memory registers receiving said fourth signal for temporary storage;

    (f) said set of memory registers sending a fifth signal indicative of the contents of said set of memory registers;

    (g) said set of memory registers receiving a first processor signal from a controller circuit;

    (h) said controller circuit receiving said first, third, and fifth signals where said controller circuit generates a first controller signal related to the value of the first said signal and related to the variation of the said first signal with respect to the said third signal where the said first controller signal is indicative of the weight present on the said scale and where the said controller circuit verifies the said first controller signal against the portion of the said fifth indicative of the contents of the registers within the said set of memory registers containing the weight information for the last purchased product and where if said verification is valid said controller circuit sends a first processor signal to said set of memory registers so as to erase the contents of the said memory registers containing the weight information for the last purchased product and sends a second processor signal to an output transmission line whose destination is the host point of sale system in which the said retail security weighing system functions and if said verification is invalid then said controller circuit via the said fifth signal sums within a controller circuit register the contents of the said registers with the said set of memory registers containing the weight information for the last purchased product with the contents of the registers within the said set of memory registers containing the weight information for the second to last purchased product and in doing so generates a second controller signal indicative of said controller circuit register and verifies the said second controller signal against the said first controller signal and if the latter verification is valid said controller circuit sends a first processor signal to said set of memory registers so as to erase the contents of the said memory registers containing the weight information for the last purchased product and weight information for the second to last purchased product and sends a second processor signal to an output transmission line whose destination is the host point of sale system in which the said retail security weighing system functions.

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