Thermal Printhead Positioning for Wear Reduction and Alignment
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Solution Overview
Problem
Existing thermal printers face challenges in efficiently handling printheads and ink ribbons during non-printing and service times, particularly in industrial applications, leading to wear and alignment issues that affect print quality and efficiency.
Innovation Solution
A thermal printer design that allows the printhead to be displaced into three positions: a print position, a ribbon and/or printhead save position, and a service position, with a mechanism that maintains precise alignment and reduces wear by minimizing contact during non-printing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the printhead is kept in contact with the print media during non-printing operations, then alignment is maintained, but wear on the printhead and rollers increases
Solution Approach 1:
The printhead is made dynamically positionable, transitioning between a first position (contacting print media for printing) and a second position (distanced from print media for saving). The printhead positioning arrangement enables the printhead to move between these positions, allowing the system to adapt its configuration based on operational needs and thereby reduce wear during non-printing periods while maintaining alignment when needed.
2Reliability
If the printhead is displaced from the print media during non-printing, then wear is reduced, but alignment precision may be affected
Solution Approach 1:
The system performs preliminary positioning actions by establishing a known reference position for the printhead. The printhead positioning arrangement is configured to return the printhead to this reference position before printing operations resume. This preliminary action ensures that even after being distanced during non-printing, the printhead is precisely aligned when needed, resolving the contradiction between wear reduction and alignment precision.
3Productivity
If a near-edge printhead is used for high-speed printing, then printing speed increases, but the printhead is more exposed to debris and requires ribbon protection
Solution Approach 1:
The system dynamically positions the printhead between contact and distance from the print media. During printing operations, the printhead contacts the media for high-speed printing. During non-printing operations, the printhead is distanced to reduce exposure to debris. This dynamic positioning allows the system to enjoy the high-speed advantage of near-edge printheads while protecting them from debris exposure during idle periods.
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
The design ensures accurate print quality, reduces wear on printheads and rollers, and enhances operational efficiency by minimizing mechanical stress and wear, allowing for flexible switching between thermal transfer and direct thermal applications.
Implementation Method 1
a first position applying a first amount of pressure on a print media, a second position applying a second amount of pressure on the print media
Implementation Method 2
The printer applies heat to the printhead, causing the ink on the ribbon to melt and transfer onto the print media
Implementation Method 3
The printer applies heat to the printhead, causing the ink on the ribbon to melt and transfer onto the print media
Implementation Method 4
The ink adheres to the print media, resulting in a permanent image
Data Source
AI summary
The disclosure relates to a thermal printer for printing on a print media, comprising: a printhead (110, 110′, 110″), a printhead positioning arrangement (120) for displacing the printhead, a ribbon feeding arrangement comprising a print ribbon unwinder (150) and a ribbon rewinder (151), at least one roller (162). In operation, the printhead positioning arrangement is configured to displace the printhead into at least three positions: a first position applying a first amount of pressure on a print media, a second position applying a second amount of pressure on the print media, and a third position in which the printhead is distanced from the print media and applies no pressure on the print media.