Print Cassette Thermal Ink Transfer Mechanism
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Solution Overview
Problem
Conventional lettering tapes require hard rubbing with a tool to retransfer characters, which is inefficient and inconvenient.
Innovation Solution
A print cassette system comprising an adhesive tape, an ink ribbon, and an application tape, where the ink is thermally transferred onto the application tape's printing surface, allowing retransfer with light pressure, using an adhesive layer on a release sheet that can be easily removed from the release sheet but not from the application tape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional lettering tape is used, then characters can be transferred to the object, but hard rubbing with a tool is required to retransfer the characters
Solution Approach 1:
The invention divides the transfer process into two distinct stages: first, ink is thermally transferred from the ink ribbon to the application tape to form a latent image; second, the application tape is pressed against the object to retransfer the ink. This segmentation allows the use of gentle pressure during retransfer since the ink is already fixed on the application tape, eliminating the need for hard rubbing with tools.
Solution Approach 2:
The invention replaces the mechanical rubbing action with a thermal transfer mechanism. Instead of using mechanical force (hard rubbing with a stylus) to transfer ink, the system uses heat from a thermal head to transfer ink onto the application tape, which then adheres to the object with light pressure. This substitution of mechanical action with thermal action resolves the contradiction between ease of operation and force requirement.
2Ease of operation
If the adhesive is removed from the release sheet, then the application tape can be applied to the object, but the adhesive must remain on the application tape
Solution Approach 1:
The invention extracts the adhesive from the application tape and places it on a separate release sheet. During application, the release sheet is peeled off, leaving the adhesive on the application tape. This extraction allows the adhesive to be temporarily separated for easy application while ensuring it remains on the application tape for reliable bonding to the object. The release sheet acts as a temporary carrier that is removed during the application process.
3Force
If thermal transfer is used, then ink can be transferred with light pressure, but a thermal head and control system are required
Solution Approach 1:
The invention merges the ink transfer function and the application tape function into a single integrated system. The application tape serves dual purposes: as the medium for thermal ink transfer and as the carrier with adhesive for bonding to the object. This merging reduces the need for separate components and simplifies the overall system, making the thermal transfer process more practical despite the requirement for a thermal head.
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 efficient retransfer of ink onto an adherend with light pressure, facilitating easy application and removal, suitable for curved surfaces and allowing precise control over ink placement.
Implementation Method 1
the application tape comprises a printing surface to which ink of the ink ribbon is thermally transferred
Implementation Method 2
the adhesive layer is formed with an adhesive coating a first side of the release sheet, and the adhesive is capable of being removed from the release sheet, but incapable of being removed from the application tape and the ink
Data Source
AI summary
The lettering tape produced by the print cassette is composed of an application tape and an adhesive tape. The adhesive tape has a release sheet with which an adhesive layer is coated. A printing surface of the application tape to which the ink is thermally transferred and the adhesive layer are overlapped to be stuck to each other to compose the lettering tape retransferring the ink.