Modular Vending Machine Control Assembly for Product Removal Detection
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Solution Overview
Problem
Open-door vending machines face challenges in accurately charging consumers for removed products and maintaining inventory accuracy due to the need for sensors to detect product removal and prevent tampering, while closed-door machines limit consumer interaction and increase the risk of incorrect or damaged product selection.
Innovation Solution
A modular control assembly for open-door vending machines that includes a support structure with a control unit, transceiver, and power supply, integrated with product sensors and user interfaces to detect product removal, authenticate consumers, and prevent tampering, allowing for accurate charging and inventory management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If open-door vending machines are used to allow direct product selection, then consumer experience is improved, but the machine requires complex sensors and control systems to detect product removal and prevent tampering
Solution Approach 1:
The control system is divided into modular components: product sensors mounted on shelves detect removal independently, a control unit processes signals, and a communication module handles data transmission. This segmentation allows each component to perform its function with simpler design, reducing overall system complexity while maintaining open-door accessibility.
Solution Approach 2:
The control assembly is designed as a universal module that can be adapted to different vending machine configurations. The same control unit handles multiple functions: detecting product removal, identifying products, preventing tampering, and managing transactions. This multi-functionality reduces the need for separate specialized components, simplifying the overall system.
2Measurement precision
If sensors are added to detect product removal, then charging accuracy is improved, but device complexity and cost increase
Solution Approach 1:
Product sensors are positioned to automatically detect when products are removed from shelves without requiring additional activation mechanisms. The sensors self-activate upon product removal, providing accurate detection while minimizing the need for complex control logic and reducing overall system complexity.
3Reliability
If tampering detection systems are implemented, then revenue protection is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors sensor signals and compares them against expected patterns. When anomalies are detected (such as attempted tampering or unauthorized removal), the system provides immediate feedback by triggering alerts or preventing operation. This feedback mechanism enables reliable revenue protection through simple monitoring and comparison logic rather than complex detection systems.
Data Source
AI summary
A vending machine includes a product storage cabinet having a housing defining a storage compartment for storing a product and a door movably connected to the housing. A product sensor is configured to detect removal of the product from the storage compartment. The vending machine further includes a control assembly configured to control operation of the vending machine. The control assembly includes a support structure, a control unit mounted on the support structure, a transceiver mounted on the support structure, and a power supply mounted on the support structure. The control assembly is configured to receive information from collected by the product sensor to determine an identity of the product removed from the storage compartment.