Linerless Thermal Printer Reverse Feed to Prevent Platen Roller Sticking
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Solution Overview
Problem
Linerless thermal printers face issues with adhesive material sticking to the platen roller after prolonged inactivity, leading to paper jams and operational inefficiencies when resumed.
Innovation Solution
A method involving reverse movement of the linerless printing material to a defined print start position before printing, utilizing sensors and control signals to manage the platen roller, ensuring the material is positioned correctly and preventing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the linerless printing material remains in the print start position between the print head and platen roller after cutting, then the printer is ready for the next printing operation, but the adhesive coating sticks to the platen roller after prolonged inactivity causing paper jams
Solution Approach 1:
The patent applies preliminary action by moving the linerless printing material to a waiting position before the print start position during periods of inactivity. This preventive measure ensures that when the printer resumes operation, the material is already positioned correctly and the adhesive has not had time to bond to the platen roller, thus avoiding paper jams and ensuring reliable operation
Solution Approach 2:
The patent inverts the conventional approach by not leaving the material at the print start position (between print head and platen roller) during inactivity, but instead retracting it to a waiting position behind the cutting device. This reverse positioning strategy prevents the adhesive from contacting and bonding to the platen roller surface during idle periods
2Loss of energy
If the printer is inactive for a long time with material in the print start position, then energy consumption is reduced, but the adhesive force increases causing the material to wrap around the platen roller
Solution Approach 1:
The system performs preliminary action by automatically retracting the linerless printing material to the waiting position during detected periods of inactivity. This prevents the adhesive from bonding to the platen roller and eliminates the need for energy-consuming manual intervention to resolve paper jams, thereby reducing overall energy loss while preventing harmful adhesive wrapping
Solution Approach 2:
The printer system serves itself by automatically detecting inactivity and repositioning the printing material without user intervention. The control unit monitors printer status and autonomously moves the material to the waiting position, preventing adhesive bonding issues and eliminating the need for manual paper jam resolution, thus reducing energy consumption associated with manual operations
3Reliability
If reverse movement is implemented to prevent adhesive sticking, then reliability is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies universality by using the existing platen roller motor to perform dual functions: forward movement during normal printing operations and reverse movement during inactivity periods. The same motor, control unit, and mechanical structure serve both directions of material transport, avoiding the need for separate actuators or complex additional mechanisms while maintaining high reliability through automated reverse positioning
Data Source
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AI summary
The invention relates to a method for operating a linerless thermal printer (2), the method at least comprising the step of: (S600) moving a linerless printing material (20) in reverse direction (RR) counter to a conveying direction (FR) from a waiting position (II) to a print start position (I) before printing on the linerless printing material (20).