Thermal Transfer Printer Ribbon Bending and Fusing Mechanism
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Solution Overview
Problem
Used ribbons in thermal transfer printers pose a risk of information leakage due to recorded images, and existing solutions that fold and fuse the ribbons often apply excessive tension, making them breakable and difficult to maintain.
Innovation Solution
A thermal transfer printer design featuring a first bending member with a curved surface and a second bending member with an acute apex, which form a bend line in the ribbon with reduced tension, combined with a folder and heater to fuse the dye layers, preventing information leakage while maintaining printer functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure roller or angled guide member is used to form a bend line in the ribbon, then the ribbon can be folded for information leakage prevention, but great tension is applied to the bent portion making the ribbon easily breakable and maintenance difficult
Solution Approach 1:
The first bending member uses a curved surface instead of a sharp edge to bend the ribbon, distributing the bending stress along the curved path. This reduces peak tension at any single point while still forming the necessary bend line for subsequent folding and information leakage prevention.
Solution Approach 2:
The bending process is divided into two separate stages performed by two different bending members. The first bending member creates an initial gentle curve, and the second bending member forms the final sharp bend line. This segmentation allows each component to be optimized for its specific function without subjecting the ribbon to excessive tension from a single aggressive bending element.
2Reliability
If a pressure roller or angled guide member is used to form a bend line in the ribbon, then the ribbon can be folded for information leakage prevention, but the printer becomes difficult to maintain
Solution Approach 1:
The curved surface of the first bending member allows the ribbon to bend smoothly without concentrated stress points that would cause frequent breakage. This reduces maintenance needs compared to sharp-edged guide members that create high-stress concentration points requiring frequent replacement.
Solution Approach 2:
By separating the bending function into two distinct members with different geometries, the design allows each component to be independently optimized and replaced if needed. The first bending member with its curved surface is more durable and less prone to causing ribbon breakage, thereby improving overall system maintainability.
3Productivity
If the bending members are positioned close together, then the ribbon can be folded efficiently, but excessive tension is applied causing the ribbon to break
Solution Approach 1:
The first bending member performs a preliminary bending action that creates a gentle curve in the ribbon before it reaches the second bending member. This preliminary curvature reduces the stress required by the second bending member to form the final bend line, allowing efficient folding while preventing ribbon breakage through staged stress application.
Solution Approach 2:
The curved surface of the first bending member distributes the bending stress over a longer path, reducing peak tension. When combined with the second bending member at an optimized distance, this allows the ribbon to be folded efficiently without exceeding its tensile strength limits.
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 solution effectively prevents information leakage from used ribbons without causing them to break, ensuring secure disposal and easy maintenance of the printer.
Implementation Method 1
a heater for fusing opposing dye layers of the folded ribbon together
Implementation Method 2
a first bending member for bending the ribbon after thermal transfer, the first bending member having at least one curved surface that is aligned perpendicular to a conveyance direction of the ribbon
Implementation Method 3
a second bending member disposed at a distance from the first bending member, the second bending member having at least one acute apex that is aligned perpendicular to the conveyance direction of the ribbon, the apex causing a bend line to be formed in the used ribbon
Implementation Method 4
a folder for folding the ribbon conveyed from the second bending member along the bend line
Data Source
AI summary
A thermal transfer printer according to the invention includes at least one printing unit for thermal transfer printing with a print head via a ribbon having a dye layer; a first bending member for bending the ribbon after thermal transfer, the first bending member having at least one curved surface that is aligned perpendicular to a conveyance direction of the ribbon and protrudes toward one or the other surface of the ribbon; a second bending member disposed at a distance from the first bending member, the second bending member having at least one acute apex that is aligned perpendicular to the conveyance direction of the ribbon and protrudes toward the one or the other surface of the ribbon, the apex causing a bend line to be formed in the used ribbon conveyed from the first bending member; a folder for folding the ribbon conveyed from the second bending member along the bend line; and a heater for fusing opposing dye layers of the folded ribbon together.