Self-Checkout Weighing for Error-Free Commodity Registration

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Solution Overview

Problem

Existing retail systems for registering commodities by weight are prone to erroneous operations due to complex procedures and multiple selection options, leading to customer confusion and potential errors.

Innovation Solution

A self-checkout system comprising a weighing device, management server, and customer terminal that automatically calculates the price of a commodity based on weight changes, reducing the need for manual selection by the customer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the customer manually selects the commodity and places it on the weighing device, then the system can acquire commodity identification and weight, but the procedure becomes complex and prone to erroneous operations

Engineering Contradiction:

Improveaccuracy of commodity registrationVSAvoidcomplexity of registration procedure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The weighing device automatically performs commodity identification and weight acquisition without requiring manual customer selection. The system detects the commodity on the weighing device and automatically registers it, eliminating the need for customers to navigate complex selection procedures while maintaining accurate registration.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system pre-configures the weighing device with commodity identification capabilities. Before the customer places the commodity, the device is prepared to automatically recognize and identify the commodity type, so that when the commodity is placed, the identification and weight acquisition occur automatically without requiring customer action for selection.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If multiple selection options are provided for commodity registration, then the system can handle various commodity types, but the customer may perform erroneous operations due to confusion

Engineering Contradiction:

Improveability to handle different commodity typesVSAvoidease of commodity selection

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The weighing device automatically identifies the commodity type and selects the appropriate registration parameters without requiring the customer to manually choose from multiple options. The system handles the adaptability to different commodity types automatically, simplifying the customer's task to merely placing the commodity on the device.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The manual selection process is replaced with an automated optical or sensor-based identification system. The weighing device uses cameras or sensors to recognize the commodity and automatically retrieves the corresponding registration information, replacing the mechanical interaction of manual selection with an automated recognition system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the customer must follow multiple procedures for weighing registration, then the system can ensure proper recording, but the process becomes time-consuming and error-prone

Engineering Contradiction:

Improvecompleteness of registration recordingVSAvoidtime required for registration process

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The commodity identification, weight measurement, and registration recording functions are merged into a single automated process. When the commodity is placed on the weighing device, all these functions execute simultaneously rather than as separate sequential steps, reducing the time required while ensuring complete and accurate registration.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system pre-prepares the registration framework and commodity database before the customer arrives. When the commodity is placed on the device, the system quickly matches the identified commodity with its pre-stored information and completes the registration, eliminating the need for time-consuming real-time lookups and manual data entry.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system simplifies the registration process by allowing customers to remove the desired amount of a commodity from a container, with the system calculating and displaying the price, thereby minimizing erroneous operations and enhancing user convenience.

Implementation Method 1

a weighing unit to detect a change in weight of items in a container on the weighing unit

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS20260071909A1Weighing system, weighing device, and weighing method

Publication Date: 2026.03.12 TOSHIBA TEC KK

AI summary

According to one embodiment, a transaction processing system for weighed commodities includes a server device and a weighing device. The weighing device has a communication unit connected to the server device and a weighing unit to detect a change in weight of items in a container on the weighing unit. When the weighing unit detects a reduction in the weight of items in the container, the weighing device transmits a weight change notice to the server device via the communication unit. The weight change notice includes a weight change value corresponding to the reduction in weight and a weighing device code identifying the weighing unit. Upon receiving the weight change notice, the server device calculates a registered item price according to the weight change value and an item unit weight associated with the weighing device code in the server device.