Ring-like Conveyance Path for Compact Color Thermal Printing
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Solution Overview
Problem
Conventional color thermal printers are bulky and costly due to their design requirements, including large platen drums and complex structures, and have inefficient printing times as they need to convey sheets back and forth for each color, wasting space and increasing production time.
Innovation Solution
A compact thermal printer design with a ring-like conveyance path where the thermal head is positioned inside, allowing the recording sheet to circulate with its printing face inward, enabling simultaneous color printing without the need for large platen drums or complex clamping mechanisms, and utilizing a multi-color ink ribbon cassette within the path for efficient image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-diameter platen drum is used to wind the recording sheet, then the recording sheet can be held in place, but the printer size increases and manufacturing cost increases
Solution Approach 1:
The patent places the thermal head inside the ring-like conveyance path formed by the housing and ink ribbon cassette, nesting components within the circular path rather than around it. This eliminates the need for a large external platen drum while maintaining the recording sheet holding function through the circular path geometry itself.
Solution Approach 2:
Instead of winding the recording sheet around an external drum as in conventional printers, the patent inverts the approach by having the recording sheet traverse an internal ring-like path formed by the housing and cassette assembly, with the thermal head positioned inside this path rather than outside.
2Reliability
If clamps are used to fix the recording sheet to the platen drum, then the sheet can be held securely, but the structure becomes complicated
Solution Approach 1:
The patent removes the clamps and platen drum entirely from the design, extracting the fixation function and replacing it with the ring-like conveyance path formed by the housing and ink ribbon cassette. The recording sheet is held and conveyed through the circular path geometry itself, eliminating the need for separate fixation components.
Solution Approach 2:
The ring-like conveyance path serves multiple functions simultaneously: it holds the recording sheet, guides its movement, positions the thermal head, and contains the ink ribbon cassette. This multi-functional design replaces multiple separate components (drum, clamps, guides) with a single integrated structure.
3Device complexity
If the thermal head is disposed outside the ring-like conveyance path, then the structure is simpler, but the printer size increases
Solution Approach 1:
The thermal head is nested inside the ring-like conveyance path formed by the housing and ink ribbon cassette, utilizing the internal space of the circular path. This positioning reduces the overall printer footprint while maintaining structural simplicity, as the thermal head is integrated within the existing path geometry rather than adding external bulk.
4Device complexity
If the recording sheet is conveyed back and forth for each color printing, then the printing process is simpler to control, but the printing time increases
Solution Approach 1:
The recording sheet is conveyed continuously in one direction along the ring-like path, allowing multiple color inks to be applied in sequence without reversing direction. The thermal head remains stationary inside the path while the sheet passes by, enabling continuous printing action across yellow, magenta, and cyan sections without back-and-forth movement interruptions.
Solution Approach 2:
The patent transforms the conventional linear back-and-forth conveyance into a circular one-dimensional path that functions like a two-dimensional workspace. The ring-like path allows the recording sheet to pass the thermal head multiple times in sequence, effectively creating multiple printing opportunities within a single continuous loop without requiring directional changes.
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 printer achieves size reduction, simplified structure, and reduced production time by effectively using the internal space for the thermal head and ink ribbon, enabling efficient superimposed color printing without the need for extensive sheet conveyance and complex mechanisms.
Implementation Method 1
a thermal head that has a heating device and a conveyance device that conveys a recording sheet and a film-like ink ribbon coated with an ink. In the thermal printer, the ink ribbon is loaded between the recording sheet and the thermal head such that an ink of the ink ribbon is transferred to the recording sheet by the thermal head that is driven in accordance with print data
Data Source
AI summary
A size-reduced printer that conveys a recording sheet in a circulating manner along a ring-like conveyance path while printing a plurality of images on the recording sheet in different colors sequentially in a superimposed manner, thereby forming a full color image. When a ribbon cassette that contains a multi-color ink ribbon is loaded at a predetermined position within a printer housing, a ring-like conveyance path is formed between the ribbon cassette and the printer housing. While the thermal head is driven and the recording sheet is conveyed once in a circulating manner along the conveyance path, a one-color image is printed on a previous printed one-color image in a superimposed manner in a corresponding one of the different color inks of the multi-color ink ribbon, thereby forming a full color image finally.