Sheet Laminator Multi-Feeding Detection and Retraction Mechanism
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Solution Overview
Problem
Existing sheet laminators face challenges in handling multiple feeding of sheets during the lamination process, leading to inefficiencies and potential damage, as they lack effective mechanisms to manage and retry sheet feeding when abnormalities occur.
Innovation Solution
A sheet laminator with a multi-feeding detector, a fixing device applying heat and pressure, an ejection device, a purging portion, and a passage switcher that retracts abnormal sheets to a separate conveyance passage, allowing for automatic retry of sheet feeding with a new sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sheet laminator uses a conventional single conveyance passage without a retraction passage, then the device complexity is low, but when multiple feeding occurs, the sheets cannot be properly managed and cause damage or irregular stops
Solution Approach 1:
The conveyance passage is segmented into a normal conveyance passage for successful sheets and a retraction passage for abnormal sheets. The passage switcher divides the single passage into two separate paths, allowing different handling for different sheet conditions. This segmentation resolves the contradiction by providing specialized handling for multiple feeding while maintaining overall system reliability.
Solution Approach 2:
The passage switcher acts as an intermediary device that detects sheet conditions and directs them to appropriate passages. It mediates between the sheet feeder and the fixing device, using detection signals to control the flow of sheets. This intermediary mechanism enables reliable multiple feeding handling without requiring complex structural changes throughout the entire system.
2Reliability
If the sheet laminator stops for every multiple feeding detection, then sheet damage is prevented, but productivity decreases due to frequent stops and retries
Solution Approach 1:
Abnormal sheets causing multiple feeding are extracted from the main conveyance flow and directed to the retraction passage. This separates the handling of defective sheets from successful processing, allowing the main conveyance system to continue operating without frequent stops. The extraction mechanism prevents damage while maintaining productivity by isolating abnormalities from the primary workflow.
Solution Approach 2:
The system maintains continuous useful action by automatically retrying sheet feeding for extracted abnormal sheets without interrupting the overall lamination process. The passage switcher enables the system to continue processing normal sheets while separately managing retries, ensuring continuous productivity. The useful action of lamination continues uninterrupted while abnormal sheets are handled through the retraction passage with automatic retry mechanisms.
3Ease of operation
If abnormal sheets are retracted to a separate passage, then usability is enhanced by maintaining reusable sheets, but the device complexity increases due to additional passages and control mechanisms
Solution Approach 1:
The system performs self-service by automatically detecting multiple feeding conditions and directing sheets to the retraction passage without user intervention. The passage switcher and control circuitry automatically manage sheet routing and retry operations, enhancing usability through automation. This self-service mechanism improves ease of operation while the automated control minimizes the complexity burden on the user.
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
Enhances user convenience by automatically managing multiple feeding issues, preventing damage, and ensuring continuous lamination operations without irregular stops, while maintaining reusable sheets in a purge tray.
Implementation Method 1
The fixing device fixes the two-ply sheet by application of heat and pressure
Data Source
AI summary
A sheet laminator laminates a two-ply sheet and a sheet-shaped medium inserted in the two-ply sheet. The sheet laminator includes a sheet feeder, a multi-feeding detector, a fixing device, an ejection device, a purging portion, a passage switcher, and circuitry. The sheet feeder feeds the two-ply sheet. The multi-feeding detector detects multiple feeding of the two-ply sheet. The fixing device fixes the two-ply sheet by application of heat and pressure. The ejection device ejects the two-ply sheet that has been fixed by the fixing device. The purging portion is disposed at a position different from the ejection device. The passage switcher switches a conveyance passage of the two-ply sheet to the fixing device or to the purging portion. The circuitry conveys the two-ply sheet to the purging portion and retries sheet feeding with another two-ply sheet, in response to detection of multiple feeding of the two-ply sheet.