Enclosed CVT Scanner for Document Handler Jamming
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Solution Overview
Problem
Conventional document handlers with Constant Velocity Transport (CVT) systems are prone to jamming and debris accumulation, and the CVT glass can become contaminated and damaged, leading to reliability issues and increased maintenance needs.
Innovation Solution
The design integrates a completely enclosed CVT scanning system within the document handler, eliminating external contamination and reducing paper jams by containing the scanning path entirely within the device, with a separate or thinner CVT glass that does not need to withstand posterior stresses, and allowing for easy cleaning and conversion of existing printers into multi-function printers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CVT glass is exposed to the external environment for scanning, then scanning functionality is achieved, but the CVT glass becomes contaminated and damaged leading to reliability issues
Solution Approach 1:
The patent places the CVT glass inside a sealed enclosure or housing that protects it from external contamination and damage. The scanning mechanism operates within this enclosed space, allowing the CVT glass to be protected while still enabling scanning functionality.
Solution Approach 2:
The patent introduces a transparent barrier or window as an intermediary between the external scanning environment and the CVT glass. This barrier allows optical transmission for scanning while protecting the CVT glass from direct exposure to contaminants and mechanical damage.
2Ease of operation
If the CVT system is exposed to external paper paths, then paper feeding is enabled, but jamming and debris accumulation occur
Solution Approach 1:
The patent divides the paper handling system into separate enclosed zones. The CVT system is isolated within a protected enclosure, while paper feeding occurs through dedicated openings or ports. This segmentation prevents debris from the external paper path from contaminating the internal CVT mechanism.
Solution Approach 2:
The patent uses sealed openings, filters, or protective barriers as intermediaries between the external paper path and the internal CVT system. These intermediaries allow paper to enter the enclosed space while blocking debris and contaminants from reaching the CVT glass and mechanism.
3Strength
If a thick CVT glass is used to withstand posterior stresses, then structural integrity is maintained, but the platen area becomes less flat
Solution Approach 1:
The patent introduces a support structure, mounting bracket, or reinforcement element as an intermediary to provide structural support to the CVT glass. This allows the use of thinner, flatter glass while maintaining structural integrity through the supporting framework rather than relying on glass thickness alone.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the CVT glass assembly. The CVT glass itself is kept thin and flat for optimal scanning surface, while local reinforcement elements or mounting structures provide the necessary structural support at specific locations to withstand posterior stresses.
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
This solution enhances reliability, reduces jamming and contamination, and allows for a flatter platen area, improving the overall performance and ease of maintenance of document handling systems while enabling field upgrades to existing printers.
Implementation Method 1
A moveable internal scanner is located within the outer casing, and is positioned to move past the transparent platen within the outer casing. The moveable internal scanner is in a location within the outer casing to optically scan items that are external to the outer casing through the transparent platen.
Implementation Method 2
A transparent member within the outer casing is located between the sheet feeder system and the moveable internal scanner and keeps the sheets being transported by the sheet feeder system from contacting the moveable internal scanner.
Data Source
AI summary
A detachable document handler (having an outer casing) has a transparent platen as the casing bottom, and a document tray as the casing top. A moveable internal scanner is located within the outer casing, and is positioned to move past the transparent platen within the outer casing. The moveable internal scanner is in a location within the outer casing to optically scan items external to the outer casing through the transparent platen. A sheet feeder system are also within the outer casing. The sheet feeder system (within the outer casing) is positioned adjacent the document tray in a location to feed sheets from the document tray, internally within the outer casing, past the moveable internal scanner, and back to the document tray. A transparent member within the outer casing is located between the sheet feeder system and the moveable internal scanner.