RFID Circuit Placement via Transfer Drum Indexing
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Solution Overview
Problem
The existing methods for assembling RFID devices, particularly RFID tags and labels, face challenges in achieving high-speed production while maintaining small form factors and accurate placement of interposers onto antennas, due to differences in pitch between the interposer web and the antenna web, leading to inefficiencies and complexity in the manufacturing process.
Innovation Solution
A high-speed machine and method that involves separating RFID circuits from a web, testing for defects, and using a transfer drum with a rotary placement device to accurately place non-defective circuits onto electrical components, while removing defective ones, to synchronize the tangential velocity of the transfer drum with the linear velocity of the web, enabling seamless indexing and placement without interrupting the web advancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous web of RFID circuits is used with high-speed placement, then productivity increases, but manufacturing precision deteriorates due to difficulty in accurately placing circuits onto antennas with different pitches
Solution Approach 1:
The patent introduces an intermediary indexing mechanism that temporarily holds and repositions RFID circuits from the continuous web to match the antenna pitch. This mediator system allows the placement head to operate at high speed while the indexing mechanism handles the precision alignment, effectively decoupling speed from precision requirements.
Solution Approach 2:
The patent segments the placement system into distinct functional modules: a continuous web feed system for high-speed supply, an indexing mechanism for pitch transformation and positioning, and a placement head for accurate mounting. This segmentation allows each module to optimize for its specific function, with the web feed providing speed and the indexing providing precision.
2Adaptability or versatility
If the antenna web spacing is large (5-8 cm), then antenna design flexibility improves, but productivity deteriorates because the web must move large distances between placements
Solution Approach 1:
The patent replaces the traditional mechanical web transport system with a rotary indexing table that rotates to bring antennas into position under the placement head. This substitution eliminates the need for the web to physically travel long distances, as the indexing table can rapidly rotate to position the next antenna regardless of spacing, thereby maintaining high productivity while supporting large antenna spacings.
3Manufacturing precision
If intermittent indexing is used to place chips onto antennas, then manufacturing precision improves, but productivity deteriorates due to web stopping and starting
Solution Approach 1:
The patent maintains continuous web advancement while the indexing mechanism operates independently to position circuits for placement. The web never stops moving forward, eliminating idle time and maintaining continuous production flow, while the indexing system provides the necessary positioning accuracy without interrupting the overall process.
Solution Approach 2:
The patent employs a dynamic indexing mechanism that can rapidly accelerate and decelerate to synchronize circuit positioning with the moving web. This dynamic system allows for precise placement timing without requiring the web to stop, maintaining continuous motion and high productivity while achieving accurate positioning through controlled dynamic movement.
Data Source
AI summary
A high-speed machine and method for placing an RFID circuit onto an electrical component includes separating an RFID circuit from a web of RFID circuits, and placing the RFID circuit onto an electrical component with a placing device. The separating includes directing the RFID circuit onto a transfer drum of the placement device and separably coupling the RFID circuit to the transfer drum. According to one method, a separator device separates and directs chips or interposers onto a placement device. According to another method, chips or interposers are tested before being separated from a web, and if good, are separated from the web, directed onto a placement device, and placed on an electrical component. If defective, the chips or interposers are not directed onto a placement device and are removed by a scrap web removal device.