Transmissive Drum Test Apparatus for Reusable Ink Evaluation
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Solution Overview
Problem
Traditional test apparatuses for evaluating ink and ink nozzles are wasteful and expensive due to the use of disposable recording mediums, and they struggle to clearly assess non-visible ink colors on re-usable surfaces.
Innovation Solution
A test apparatus featuring a transmissive drum with a light source and imaging devices to form and assess printed markings, allowing for ink removal and evaluation without a disposable medium, with optional features like diffusers and strobe lighting for enhanced visibility and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a disposable recording medium is used for ink testing, then the visibility and assessment of printed patterns is straightforward, but the cost and waste increase significantly
Solution Approach 1:
The patent replaces expensive disposable paper with a reusable transparent drum that can be cleaned and reused multiple times, eliminating the need for continuous disposal of recording media while maintaining assessment capabilities
Solution Approach 2:
Instead of discarding the entire recording medium after one use, the patent enables recovery and reuse of the drum surface through ink removal mechanisms, allowing the same surface to be reused for multiple testing cycles
2Loss of substance
If a re-usable cylindrical printing surface is used, then paper waste is reduced, but the visibility of certain ink colors becomes problematic
Solution Approach 1:
The patent introduces a light source as an intermediary element that illuminates the transparent drum from behind, enabling the ink patterns to be clearly visible against the transparent background without requiring the ink to inherently provide its own contrast
Solution Approach 2:
The patent utilizes the transparency and optical properties of the drum material to enhance ink visibility, where the drum's ability to transmit light creates contrast that makes various ink colors observable, particularly when illuminated from the rear
3Illumination intensity
If a transparent drum with internal light source is used, then ink visibility is improved, but the device complexity increases
Solution Approach 1:
The transparent drum serves multiple functions simultaneously: it acts as the printing surface, provides structural support, enables light transmission for visibility, and allows for ink removal access, reducing the need for separate components for each function
Solution Approach 2:
The light source is nested within the drum structure, with the illumination component positioned inside the transparent drum to provide backlighting, creating a compact integrated design rather than requiring external lighting arrangements
4Reliability
If disposable paper is used for each test, then cross-contamination between tests is avoided, but the cost and time for medium replacement increase
Solution Approach 1:
The patent implements an ink removal mechanism that cleans the drum surface between tests, recovering the recording surface for reuse and eliminating the need for physical medium replacement while preventing cross-contamination through effective ink removal
Solution Approach 2:
The reusable drum with cleaning capability allows continuous testing without interruption for medium replacement, maintaining test reliability through proper cleaning protocols while enabling uninterrupted operation
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 reduces waste and costs by reusing the drum surface, improves visibility of ink colors, and enables accurate detection of printing errors through detailed imaging and analysis, facilitating effective nozzle and ink quality assessment.
Implementation Method 1
a light source disposed inside the drum to controllably illuminate the drum
Implementation Method 2
a diffuser disposed between the light source and the drum
Data Source
AI summary
The disclosure concerns a test apparatus comprising a drum (100) configured such that ink drops (200) deposited on the surface of the drum form a printed marking (210) on the surface of the drum. The test apparatus further comprises an ink removal unit (300) configured to remove ink from the surface of the drum. The drum is at least partially transmissive of light and a light source (800) is disposed inside the drum to controllably illuminate the drum.