Roll-up Prevention Device for Linerless Label Thermal Printers
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Solution Overview
Problem
Linerless labels in thermal printers tend to roll up due to decreased non-adhesive properties of platen rollers over time, especially during long-term use or when the printer is idle, causing issues with label issuance and discharge, particularly during forward and reverse feeding.
Innovation Solution
A roll-up prevention device integrated with the platen roller, featuring upstream and downstream roll-up prevention members positioned on either side of the platen roller, which guide the label to prevent sticking and rolling, maintaining stable feeding by fixing the relative positions of these members to the platen roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the platen roller is made of silicone rubber with releasing properties to prevent adhesion, then the linerless label can be fed smoothly without rolling up initially, but the non-adhesive properties gradually decrease over time causing the label to stick and roll up during continuous or long-term use
Solution Approach 1:
The solution divides the platen roller into two functional segments: the main platen roller surface made of silicone rubber for printing, and a separate roll-up prevention member with a different surface treatment (higher adhesion) positioned downstream. This segmentation allows each part to have optimized properties for its specific function without compromising the other.
Solution Approach 2:
The roll-up prevention member acts as an intermediary element between the platen roller and the label. It has a surface specifically designed to control label adhesion - with higher adhesion than the platen roller surface - to prevent the label from rolling up after printing, thereby mediating the interaction between the roller and label.
2Ease of operation
If the platen roller rotates in reverse to feed the label back for the next printing, then the label can be repositioned, but the label tip portion sticks to the platen roller and rolls up during reverse rotation
Solution Approach 1:
The roll-up prevention member is positioned downstream of the platen roller to preemptively control the label's behavior after it leaves the roller. By having higher adhesion properties, it ensures the label tip adheres properly during reverse rotation and maintains its shape, preventing roll-up before the label re-enters the printing position.
3Loss of time
If the printer is stopped for a long period with the label nipped between the thermal head and platen roller, then the printer is idle, but the label sticks to the platen roller and rolls up when operation resumes
Solution Approach 1:
The solution applies different surface qualities to different locations in the label path: the platen roller has low adhesion for printing, while the roll-up prevention member positioned downstream has higher adhesion. This local quality differentiation ensures that during idle periods, the label tip adheres to the prevention member rather than rolling up, maintaining feeding reliability when operation resumes.
Data Source
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AI summary
In a roll-up prevention unit, an upstream roll-up prevention member guides a linerless label toward a platen roller. A downstream roll-up prevention member guides the linerless label away from the platen roller. Brackets have a roller engagement hole engaging with a roller shaft of the platen roller, and fixes the position of the roll-up prevention unit relative to the platen roller.