Linerless Thermal Printer Retraction to Prevent Roller Sticking
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Solution Overview
Problem
Existing linerless thermal printers face issues with the adhesive coating of the substrate sticking to the drive roller during prolonged inactivity, leading to potential paper jams and operational inefficiencies.
Innovation Solution
A method involving reversing the linerless substrate movement before printing to ensure it is positioned correctly between the printhead and drive roller, using sensors and control signals to manage this process, ensuring smooth operation even during downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the linerless substrate remains in the print start position between the printhead and drive roller during prolonged inactivity, then the adhesive coating sticks to the drive roller, but moving the substrate repeatedly during standstill is complex and unreliable
Solution Approach 1:
The invention applies preliminary action by automatically moving the linerless substrate to a retracted waiting position immediately after a printing job completes, before the adhesive sticking problem can occur during prolonged inactivity. This preventive repositioning eliminates the need for complex repeated movements during standstill periods.
Solution Approach 2:
The invention extracts the substrate from the problematic print start position between the printhead and drive roller, relocating it to a safe waiting position where it cannot stick to the drive roller. This separation removes the source of the adhesive sticking issue.
2Ease of operation
If the remaining linerless substrate is retracted to a waiting position after cutting, then it avoids sticking during short idle periods, but cannot reliably break adhesive bonds formed during long periods of inactivity
Solution Approach 1:
The invention changes the temporal parameter by implementing a time-based control strategy: the substrate is retracted to the waiting position automatically after printing, and only moved back to the print start position when a new printing job is initiated. This time-based approach ensures the substrate is never left in the vulnerable print start position during prolonged inactivity, reliably preventing adhesive bond formation regardless of idle duration.
3Reliability
If the substrate is continuously moved back and forth during standstill to break adhesive bonds, then bonding is disrupted, but this causes paper jams and operational inefficiencies
Solution Approach 1:
The invention applies periodic action by moving the substrate only at specific intervals: once automatically after each printing job completes (to the waiting position), and once when a new printing job starts (back to the print start position). This periodic repositioning prevents adhesive bonding during idle periods without causing the operational inefficiencies associated with continuous movement during standstill.
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
Effectively prevents the substrate from adhering to the drive roller, thereby avoiding paper jams and maintaining printer functionality during extended idle periods.
Implementation Method 1
The resulting adhesive force between the linerless substrate and the drive roller depends on the contact pressure, the adhesive strength of the coating, the aging of any non-stick coating on the drive roller, and the contact time.
Data Source
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AI summary
The invention relates to a method for operating a linerless thermal printer (2), at least comprising the step: (S600) moving a linerless substrate (20) in a reverse direction (RR) against a conveying direction (FR) before printing the linerless substrate (20) from a waiting position (II) to a printing start position (I).