Transparent Label Tape Detection Points for Printing Position Accuracy
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Solution Overview
Problem
Printing media with transparent backing sheets of low rigidity face deformation issues when fed in a second feeding direction during thermal printing, as existing detection methods lead to misalignment and mechanical stress.
Innovation Solution
Incorporating first and second transparent regions with lower transparency than the backing sheet in inter-label regions, which serve as detection points, allowing for accurate feeding and printing without deforming the medium by positioning the printing region correctly relative to the thermal head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the printing medium is fed in the second feeding direction until printing on the printing region starts after the detection point is detected, then the printing position can be adjusted, but the printing medium deforms due to low rigidity
Solution Approach 1:
The patent applies preliminary action by pre-positioning the detection point at a specific location relative to the printing region. The detection point is placed upstream of the printing region in the feeding direction, allowing the printing medium to be fed forward (first feeding direction) rather than reversed. This preliminary positioning enables the printing start position to be accurately controlled without requiring backward feeding that would cause deformation of the low-rigidity transparent backing sheet.
2Ease of operation
If the transparent backing sheet has low rigidity to maintain flexibility, then the medium is easier to handle, but deformation occurs during feeding operations
Solution Approach 1:
The patent applies local quality by creating regions with different transparency characteristics. The detection point region has different optical properties than the printing region, allowing optical detection to occur without affecting the overall flexibility of the transparent backing sheet. This local differentiation enables the medium to maintain general flexibility while having specific zones optimized for detection and printing functions.
3Measurement precision
If the detection point is positioned to allow accurate detection, then printing alignment improves, but the printing region may be positioned incorrectly relative to the thermal head
Solution Approach 1:
The patent applies feedback by using the detection point to provide positional information that controls the feeding mechanism. The detection point's position is used as feedback to adjust the feeding distance and timing, ensuring that the printing region arrives at the correct position under the thermal head. This feedback loop maintains both detection accuracy and printing region positioning accuracy.
Solution Approach 2:
The patent applies dimensionality change by considering the spatial relationship between the detection point and printing region in multiple dimensions. The detection point is positioned not only upstream in the feeding direction but also at a specific lateral position that allows optical detection without interfering with the printing region. This multi-dimensional positioning ensures both accurate detection and correct printing alignment.
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
Prevents deformation of the printing medium by ensuring it is fed in the first feeding direction after detection, maintaining the integrity and transportability of the medium, even with low-rigidity backing sheets.
Implementation Method 1
a plurality of first transparent regions provided in a plurality of inter-label regions between the plurality of label portions and having a lower transparency than the backing sheet
Data Source
AI summary
A printing medium includes: a transparent backing sheet; a plurality of label portions adhered to the backing sheet in a line in a length direction of the backing sheet; a plurality of adhering portions provided in a plurality of inter-label regions between the plurality of label portions and having a lower transparency than the backing sheet; and a plurality of second transparent regions provided in the plurality of inter-label regions in such a way as to be adjacent to the adhering portions in the length direction of the backing sheet, and formed by the backing sheet.