Thermal Printer Heating Elements for High-Speed Dot Printing
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Solution Overview
Problem
In thermal printers, increasing printing speed and shortening the printing cycle lead to energy inefficiencies, resulting in blurring or smearing of printed characters due to reduced heating pulse times, which necessitates costly upgrades to the thermal head's voltage and current capacities.
Innovation Solution
The printer design includes a thermal head with heating elements arrayed in the main scanning direction and fed in the sub-scanning direction, where the length of elements in the sub-scanning direction is shorter than in the main scanning direction, allowing for improved heat generation efficiency and reduced energy consumption, along with a control program that applies specific heating pulses and pulse durations for each dot based on data and ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If printing speed is increased and printing cycle is shortened, then productivity is improved, but heating pulse time period becomes insufficient causing blurring and smearing
Solution Approach 1:
The heating pulse is divided into multiple sub-pulses (first heating pulse and second heating pulse) within the printing cycle. This segmentation allows the total heating energy to be distributed over time, enabling sufficient heating even with a shortened printing cycle, thus resolving the contradiction between high productivity and adequate heating duration.
Solution Approach 2:
Multiple heating pulses are applied periodically within the printing cycle rather than a single continuous pulse. This periodic heating action allows the thermal head to maintain temperature effectively while adhering to the shortened cycle time, preventing blurring and smearing while preserving printing speed.
2Use of energy by moving object
If voltage and current capacities of thermal head are increased to compensate for energy shortfall, then heating efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The heating pulse parameters (voltage, current, duration) are made dynamic and adjustable based on the specific printing conditions and thermal head state. This dynamic control allows the system to optimize heating efficiency without requiring permanent increases in voltage resistance or current capacity, thus avoiding the associated complexity and cost increases.
Solution Approach 2:
The system changes heating parameters (pulse duration, voltage level, current magnitude) adaptively during operation. By adjusting these parameters dynamically rather than designing for maximum capacity upfront, the system achieves high heating efficiency while maintaining simpler, more cost-effective hardware specifications.
3Manufacturing precision
If heating pulse time period is extended to prevent blurring, then printing quality is improved, but printing speed decreases
Solution Approach 1:
The heating process is segmented into multiple pulses distributed within the printing cycle. This allows the total heating time to be sufficient for quality printing while the overall cycle time remains short for high speed, effectively resolving the contradiction between printing quality and speed by redistributing the heating duration.
Solution Approach 2:
Multiple heating pulses are applied continuously within the printing cycle to maintain thermal head temperature and ensure consistent heating. This continuous heating action prevents blurring while the rapid succession of pulses keeps the overall cycle time short, maintaining both quality and speed.
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 enhances printing density and quality while conserving energy, preventing issues like sticking and blurring, and allows for high-density printing without the need for costly upgrades to the thermal head's components.
Implementation Method 1
The printer causes the individual heating elements to generate heat by applying electric current to the individual heating elements
Implementation Method 2
increase the heat transfer efficiency to more efficiently transmit the heat from the heating elements to the printing medium
Data Source
AI summary
A printer includes a feeding portion, a printing portion, and a processor. The feeding portion is configured to feed a printing medium in a sub-scanning direction that is orthogonal to a main scanning direction. The printing portion includes a plurality of heating elements that are arrayed in the main scanning direction and that is configured to perform printing on the printing medium fed by the feeding portion when heating pulses are applied to the plurality of heating elements each corresponding to a single dot. A length of each of the plurality of heating elements in the sub-scanning direction is shorter than a length of each of the plurality of heating elements in the main scanning direction. The processor is configured to apply one or more heating pulses to one of the plurality of heating elements in response to a command to print one dot.