Print Head Dynamics for Thermal Transfer Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current thermal printers face challenges in achieving satisfactory prints when the substrate speed is insufficient for continuous-mode printing, leading to missed or reprinted images, and existing solutions that combine intermittent and continuous modes are costly and complex, with limited image size and wear issues.
Innovation Solution
A method and apparatus that use a print head with heating elements, a thermally sensitive carrier, and a backing roller to selectively energize the print head while moving it along the roller's circumference, allowing for both continuous and incremental printing modes based on substrate speed, enabling high-quality image printing even at low speeds without additional hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous-mode printing is used on a print roller, then print speed is improved, but print quality deteriorates when substrate speed is insufficiently high
Solution Approach 1:
The patent applies dynamics by making the print head movable relative to the print roller, allowing it to traverse a limited arc (first position to second position) while maintaining contact with the substrate. This dynamic movement enables the print head to achieve sufficient relative speed for quality printing even when the substrate itself is moving slowly or intermittently, thus resolving the contradiction between continuous-mode speed and print quality at low substrate speeds.
2Adaptability or versatility
If a special rolling road style print platen is used to enable both intermittent and continuous mode printing, then printing versatility is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by enabling a conventional continuous-mode printer with a standard roller platen to perform both continuous and intermittent printing through software control of the movable print head. The same hardware infrastructure supports both printing modes, eliminating the need for special rolling road style platens and reducing device complexity while maintaining versatility.
Solution Approach 2:
The movable print head design allows the system to dynamically switch between continuous and intermittent printing modes by controlling the print head's movement and positioning, providing multi-functionality without requiring multiple specialized components.
3Adaptability or versatility
If a special rolling road style print platen is used, then printing versatility is improved, but part wear increases
Solution Approach 1:
By using a conventional roller platen for both continuous and intermittent printing modes, the patent reduces the wear on specialized components. The standard roller and print head assembly are designed for durability and can handle both modes of operation, improving reliability compared to specialized rolling road platens.
4Device complexity
If the print head is stationary during continuous printing, then device simplicity is maintained, but image size is limited by maximum print head travel
Solution Approach 1:
The patent applies dynamics by making the print head movable along the substrate feed direction while maintaining contact with the substrate. This allows the print head to traverse a limited arc on the print roller surface, effectively extending the printable image length beyond what would be possible with a completely stationary print head, while still maintaining relatively simple device architecture.
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 high-quality image printing on substrates with varying speeds, switching between continuous and incremental modes dynamically to ensure print quality and extend the capabilities of standard continuous-mode printers without significant additional expense or complexity.
Implementation Method 1
providing a carrier between the print head and the substrate, the carrier comprising a thermally sensitive print medium; selectively energizing the heating elements whilst moving the print head with respect to the roller from a first position on the roller's circumference to a second position on the roller's circumference so as to move the print head along the substrate and to transfer print medium from the carrier to the substrate
Data Source
AI summary
A method of printing an image onto a substrate including the steps of providing a substrate, a print head, and a carrier between the print head and the substrate; providing a backing roller; urging the print head towards the roller so as to urge the print head against the carrier, the carrier against the substrate, and the substrate against the roller; then selectively energizing print head heating elements while moving the print head in a first direction so as to move the print head along the substrate and transfer print medium from the carrier to the substrate to print a portion of the image on a respective area of the substrate; and after printing image portion, if there is at least one further image portion to be printed, moving the head, substrate, and carrier in a second direction, opposite to the first, in preparation for printing the next portion in a series of portions.