Thermal Transfer Printer Corner Edge Printhead Speed Control
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Solution Overview
Problem
Thermal transfer printers face challenges in maintaining print quality and efficiency when the substrate speed varies, particularly during deceleration and acceleration phases, leading to potential image distortion or waste due to the need to deactivate and reactivate printing at specific speeds.
Innovation Solution
A method for controlling a thermal transfer printer that allows ink transfer at speeds below 40 mm/s, using a corner edge printhead and dynamic timing signals to optimize energy delivery to printing elements, ensuring continuous printing and maintaining ink in a molten state throughout the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the substrate is moved at a minimum print speed to maintain printing operation, then printing efficiency is improved, but the substrate cannot stop at arbitrary times during the printing cycle
Solution Approach 1:
The patent implements dynamic timing signals that automatically adjust the energization duration of printing elements based on the actual substrate speed. When the substrate decelerates or stops, the timing signals extend the energization period to compensate for the reduced relative movement, ensuring continuous printing without requiring the substrate to maintain a minimum speed
Solution Approach 2:
The system changes the timing parameter (energization duration) of the printing elements based on the substrate speed condition. By monitoring substrate speed and dynamically adjusting the timing signal parameters, the system maintains effective ink transfer across a wide range of speeds including zero speed, eliminating the need for a minimum print speed threshold
2Manufacturing precision
If printing is deactivated when substrate speed is below minimum print speed, then print quality is maintained, but the substrate must be reversed causing image distortion or waste
Solution Approach 1:
The dynamic timing signal system continuously adapts the printing parameters to the substrate speed, allowing printing to proceed smoothly through deceleration, stopping, and acceleration phases without deactivation. This eliminates the need to reverse the substrate, preventing both image distortion and substrate waste
Solution Approach 2:
The system maintains continuous printing action across all substrate speeds by adjusting the timing signals appropriately. The printing process never needs to be deactivated or interrupted, ensuring unbroken image formation and eliminating waste associated with substrate reversal
3Measurement precision
If the substrate is decelerated to a stopped state, then positioning accuracy is improved, but printing must be stopped and resumed causing inefficiency
Solution Approach 1:
The system dynamically adjusts the timing signal duration based on substrate speed, allowing printing to continue uninterrupted during deceleration and stopping. The extended timing signals compensate for the reduced relative movement, maintaining printing effectiveness while achieving precise positioning
Solution Approach 2:
The system prepares for speed changes by pre-adjusting the timing signals based on detected substrate deceleration. This preliminary adjustment ensures that printing parameters are optimized before the substrate stops, allowing seamless continuation of printing without interruption or efficiency loss
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
Enables continuous printing across varying substrate speeds, preventing image distortion and reducing waste by maintaining ink in a molten state and optimizing energy distribution, thus improving print quality and production efficiency.
Implementation Method 1
The printhead contains printing elements which, when heated, whilst in contact with the ribbon, cause ink to be transferred from the ribbon and onto the substrate
Implementation Method 2
maintaining ink in a molten state throughout the process
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A method of operating a thermal transfer printer, the thermal transfer printer comprising: first and second spool supports each being configured to support a spool of ribbon; a ribbon drive configured to cause movement of ribbon from the first spool support to the second spool support along a predetermined ribbon path; and a printhead, the printhead being a corner edge printhead. The printhead is configured to selectively transfer ink from the ribbon to a substrate as the substrate and printhead are moved relative to one another at a print speed. The method comprises transferring ink from the ribbon to the substrate when the print speed is less than 40 millimetres per second.