Thermal Printer Sub-Block Printing with Back Distance Cooling
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Solution Overview
Problem
Thermal printers face challenges in efficiently printing large blocks of data due to memory capacity limitations in the print head, leading to potential artifacts and overheating issues when subdividing data into sub-blocks without proper alignment and cooling mechanisms.
Innovation Solution
The thermal printer subdivides print data into sub-blocks, allowing for dual printing of back distance sections to minimize transition artifacts and incorporates a mechanism to cool the print head during upstream movement, using motors and tensioning mechanisms to manage substrate and ribbon movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the entire block of print data is delivered to the print head memory, then the complete message can be printed continuously, but the memory capacity of the thermal print head is exceeded
Solution Approach 1:
The patent divides the entire block of print data into multiple sub-blocks that can be processed sequentially. The print head memory stores only the current sub-block being printed rather than the entire message, thereby resolving the memory capacity limitation while maintaining the ability to print complete messages through systematic data segmentation and sequential processing
2Productivity
If the substrate is moved continuously in the downstream direction, then printing efficiency is maintained, but transition artifacts appear between successive sub-blocks
Solution Approach 1:
The patent implements a back-distance mechanism where the substrate is repositioned upstream by a predetermined distance before printing the next sub-block. This preliminary repositioning action ensures that each sub-block is printed at the correct location with proper overlap, eliminating transition artifacts while maintaining printing efficiency through automated positioning control
3Speed
If the thermal print head operates continuously, then printing speed is maintained, but the print head overheats causing printing artifacts
Solution Approach 1:
The patent incorporates periodic cooling cycles into the printing process. Between successive sub-block printing operations, the thermal print head is allowed to cool for a predetermined time period. This periodic interruption prevents overheating and associated printing artifacts while maintaining overall printing speed through efficient utilization of cooling intervals and rapid resumption of printing operations
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
This approach ensures smooth transitions between sub-blocks, reduces printing artifacts, and maintains print quality by allowing the print head to cool during substrate reversal, effectively addressing memory capacity limitations and overheating issues.
Implementation Method 1
A thermal print head in the print flow path is operable to heat the ink transfer ribbon to transfer ink to the substrate at a print location
Implementation Method 2
A tensioning mechanism, such as a clutch mechanism coupled to a supply roll of thermal print ribbon, can apply back tension to the thermal print ribbon to move the thermal print ribbon in the upstream direction as the substrate is moved in the upstream direction
Data Source
AI summary
An entire block of print data for a message is subdivided into sub-blocks of print data. During printing of sub-blocks, an earlier received sub-block of data is used to print one portion of a substrate moving in the downstream direction. The substrate is moved upstream for a back distance and then moved downstream with the next sub-block of data being printed on the substrate as it is moved downstream. As a back distance section of the substrate again travels in the downstream direction, data from the subsequent sub-block of data that corresponds to data printed on the back distance section of the substrate during printing of the immediately preceding sub-block of data, is printed on the back distance section of the substrate. The sub-blocks of data are in effect stitched together by the dual printed back distance to minimize transition artifacts.