Thermal Printer Head with Width-Adaptive Pressing Force Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional thermal printers face issues with increased cost and wear due to the need for multiple platen rollers of different widths to accommodate various roll sheet sizes, as the pressing force cannot be adequately reduced when using narrower sheets, leading to abrasion and damage.
Innovation Solution
A thermal printer design featuring a thermal head and platen roller with an elastic member that includes a pressing force releasing mechanism, allowing the elastic member to adjust its position based on the roll sheet width to reduce contact pressure and friction between the thermal head and platen roller, enabling the handling of multiple roll sheet widths with a single apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple platen rollers of different widths are prepared to accommodate various roll sheet sizes, then the printer can handle different roll sheet widths, but the apparatus cost increases
Solution Approach 1:
The platen roller is designed with a movable pressing mechanism that can dynamically adjust the pressing force applied to the thermal head. When a narrow roll sheet is detected, the mechanism reduces pressing force in regions where the thermal head would otherwise contact the platen roller directly, preventing wear without requiring multiple rollers of different widths
Solution Approach 2:
The pressing force parameter is made variable rather than fixed. The pressing mechanism can change the magnitude of pressing force applied to different regions of the thermal head based on the width of the inserted roll sheet, allowing a single platen roller to adapt to multiple sheet widths
2Reliability
If the pressing force is maintained on narrow roll sheets, then the thermal head contacts the platen roller firmly for printing, but abrasion and wear increase
Solution Approach 1:
The pressing mechanism applies different pressing forces to different regions of the thermal head. When a narrow roll sheet is detected, the mechanism locally reduces pressing force only in the regions where the sheet does not extend, while maintaining normal pressing force in regions where the sheet is present, ensuring printing quality is preserved where needed while preventing wear in contact regions
Solution Approach 2:
The system detects the roll sheet width in advance and preemptively adjusts the pressing force before printing begins. By reducing pressing force in potential contact regions before the thermal head engages the narrow sheet, the system prevents abrasion and wear before they can occur
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 reduces wear and cost by allowing the printer to handle various roll sheet widths while minimizing contact pressure and friction, thereby extending the printer's lifespan and reducing the need for multiple platen rollers.
Implementation Method 1
an elastic member provided on an opposite side of the platen roller with respect to the thermal head, for pressing the thermal head toward the platen roller
Implementation Method 2
heating a printing surface (heat sensitive surface) of the thermal paper by heating elements of the thermal head while feeding the thermal paper through rotation of the platen roller, thereby causing a color development of the printing surface
Implementation Method 3
feeding the thermal paper through rotation of the platen roller
Data Source
AI summary
A printer performs printing on a thermal paper drawn from roll sheets having different widths. The printer has a thermal head and a platen roller arranged opposite to the thermal head and mounted to undergo rotation for sending out the thermal paper in a state of sandwiching the thermal paper between the thermal head and the platen roller. Elastic members are arrayed along the width direction of the thermal paper and are provided on an opposite side of the platen roller with respect to the thermal head for pressing the thermal head toward the platen roller. Only one of the elastic members is provided with a pressing force releasing mechanism for separating the one elastic member from the thermal head according to a width of the one roll sheet from which the thermal paper is drawn and for releasing pressing of the thermal head by the one elastic member.