Portable Printer Pinch Roller Mechanism for Label Adhesion
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Solution Overview
Problem
Portable printers face issues with printing speed reduction and label peeling failures when using label sheets with strong adhesiveness, especially in battery-driven models, due to insufficient conveying force and potential sheet jamming.
Innovation Solution
The design incorporates a pinch mechanism with a supporting shaft, shaft holder, and detachable coil springs that apply adjustable pressing force to the platen roller, allowing for easy replacement of springs to match the adhesiveness of different label sheets, ensuring consistent printing speed and successful peeling issuance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing pressure of the pinch roller against the platen roller is increased to prevent slipping on label sheets with strong adhesiveness, then the reliability of label peeling is improved, but the printing speed decreases due to reduced conveying speed
Solution Approach 1:
The pressing pressure of the pinch roller is made dynamically adjustable rather than fixed. The spring constant can be changed based on the label sheet type, allowing the system to adapt between high pressing pressure for strong adhesion labels and low pressing pressure for standard labels, thus resolving the contradiction between reliability and productivity
Solution Approach 2:
The physical parameter of spring constant is changed to match different label sheet conditions. By selecting springs with appropriate constants (e.g., stronger springs for high-adhesiveness labels, weaker springs for standard labels), the system optimizes both peeling reliability and printing speed for different operating conditions
2Reliability
If the pressing pressure of the pinch roller is set high to handle label sheets with strong adhesiveness, then the pinch roller slips less against the base sheet, but the conveying speed of the label sheet falls due to increased resistance on the platen roller
Solution Approach 1:
The pressing pressure is made dynamically adjustable through interchangeable springs, allowing the system to switch between high pressing pressure (for reliable conveyance on high-adhesion labels) and low pressing pressure (for high conveying speed on standard labels), resolving the contradiction between conveyance reliability and conveying speed
3Reliability
If the pressing pressure is increased to prevent sheet jamming on exceptional label sheets, then the peeling and issuance success rate improves, but the power consumption increases which is problematic for battery-driven portable printers
Solution Approach 1:
The spring constant parameter is changed according to label sheet type. For exceptional label sheets with strong adhesiveness, stronger springs provide necessary pressing pressure to prevent jamming and ensure successful peeling. For standard label sheets, weaker springs reduce pressing pressure and thus power consumption, extending battery life in portable printers
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 configuration maintains printing speed for standard label sheets and prevents peeling issuance failures with label sheets having strong adhesiveness, ensuring reliable operation even with exceptional label sheets.
Implementation Method 1
an urging member detachably attachable to the member holding section, nipped by the member holding section and the supporting shaft, and configured to apply pressing force on the platen roller to the pinch roller
Data Source
AI summary
A portable printer includes: a housing; a platen roller configured to convey a label sheet having a base sheet; a pinch roller configured to rotate following the platen roller via the base sheet; a supporting shaft configured to support the pinch roller; a shaft holder configured to hold the supporting shaft; a removing and inserting section configured to hold the shaft holder to be removable therefrom and insertable thereinto; a pawl section provided in the shaft holder, configured to resiliently hook to the removing and inserting section; a member holding section provided in the housing; and an urging member detachably attachable to the member holding section, nipped by the member holding section and the supporting shaft, and configured to apply pressing force on the platen roller to the pinch roller.