Thermal Printer Head Swing Mechanism for Even Force Distribution
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Solution Overview
Problem
Thermal printers face issues with uneven pressing forces during paper feeding, leading to print line offset due to the swinging of the thermal head and deformation of the platen roller, which affects printing quality.
Innovation Solution
A thermal printer design incorporating a support pin and deformable mechanism allows the printing device to swing and adjust, ensuring even pressing forces and maintaining the thermal head's position through plastic deformation, while an elastic element and adjustable support pin facilitate adaptive force distribution and gap adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thermal head is pressed downward to ensure close contact with the paper sheet, then printing quality is improved, but the thermal head may swing due to uneven force distribution, causing print line offset
Solution Approach 1:
The patent applies the dynamics principle by making the thermal head movable rather than fixed. The thermal head is allowed to swing on its rotation shaft, and a swing limiting mechanism is introduced to control the range of motion. This dynamic design enables the thermal head to automatically adjust its position in response to uneven paper feeding forces, maintaining even pressing force distribution across the paper sheet while preventing excessive swinging that would cause print line offset.
2Adaptability or versatility
If the platen roller is made deformable to adapt to paper thickness variations, then adaptability is improved, but the roller deforms under reactive force, causing thermal head displacement and print line offset
Solution Approach 1:
The patent applies the dynamics principle by making the platen roller deformable rather than rigid. The platen roller is designed to deform elastically in response to reactive forces during paper feeding, allowing it to adapt to variations in paper thickness and maintain good contact with the paper sheet. This dynamic deformability enables the system to accommodate different paper conditions while the swing limiting mechanism prevents excessive thermal head displacement.
3Manufacturing precision
If the rotation shaft of the thermal head is positioned rearwardly to minimize platen roller compression, then printing quality is improved, but the thermal head becomes more sensitive to force deviations and swings more easily
Solution Approach 1:
The patent applies the preliminary anti-action principle by introducing a swing limiting mechanism that preemptively counteracts the tendency of the thermal head to swing excessively. The swing limiting mechanism is configured to restrict the thermal head's movement within a controlled range, preventing the thermal head from displacing too much in response to force deviations. This preliminary constraint maintains the benefits of the rearwardly positioned rotation shaft for printing quality while compensating for the increased sensitivity to force variations.
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 ensures stable and even printing force distribution, preventing print line offset and improving printing quality by allowing the printer to self-adapt to varying forces and paper thickness, maintaining high sensitivity and accuracy.
Implementation Method 1
an elastic element disposed between the holder and the base part, wherein when the recording paper sheet is clamped between the printing device and the platen roller, both the printing device and the platen roller are in close contact with the recording paper sheet due to the elastic element
Implementation Method 2
the deformable mechanism is capable of being plastically deformed to keep the position of the printing device
Data Source
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AI summary
A thermal printer comprises a base part, a holding member, a printing device and a platen roller. When an uneven pressing force is applied to the printing device by the recording paper sheet, the printing device is capable of swinging about the support pin serving as a fulcrum in order to even out the pressing force. The deformable mechanism is capable of being plastically deformed to keep the position of the printing device. An elastic element is disposed between the holding member and the base part, and due to the elastic element, both the printing device and the platen roller are in close contact with the recording paper sheet when the recording paper sheet is clamped between the printing device and the platen roller. The printing force of the printing device acting on the printing paper sheet can be distributed more even to achieve clearer printing.