Printer Drive Current Control for Variable Media Width
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Solution Overview
Problem
Conventional printers face issues with power wastage and uneven printing quality due to excessive drive current, as they do not accurately detect the width of the printing medium, leading to incorrect frictional resistance and power consumption, especially when using thermal ink ribbons of varying widths.
Innovation Solution
A printer equipped with a reading device to detect the drive current information from the printing medium and a controller to adjust the drive motor current accordingly, ensuring optimal power usage and uniform printing quality by matching the drive current to the specific width of each printing medium, and using thermal ink ribbons of the same width as the medium to reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drive current is set high to accommodate various widths of printing mediums, then the printer can handle all printing medium widths, but the drive current becomes excessive for narrower printing mediums causing power wastage and reduced printing quality
Solution Approach 1:
The drive current is dynamically adjusted based on the detected width of the printing medium. The controller changes the drive current magnitude according to the actual printing medium width, transitioning from a static fixed current approach to a dynamic adaptive current approach that matches the load requirements.
Solution Approach 2:
The drive current parameter is changed according to the printing medium width. By detecting the width and corresponding frictional resistance, the system modifies the drive current parameter to optimize power consumption and printing quality for each specific printing medium width.
2Reliability
If the drive current is set high to ensure sufficient friction for feeding, then the printing medium can be fed reliably, but printing quality deteriorates and power consumption increases
Solution Approach 1:
The drive current parameter is optimized by changing it according to the printing medium width. This ensures sufficient current for reliable feeding while avoiding excessive current that would degrade printing quality, achieving an optimal balance for each printing medium type.
3Reliability
If the drive current is increased to compensate for larger frictional resistance in narrow printing mediums, then feeding reliability improves, but power consumption increases
Solution Approach 1:
The drive current parameter is precisely adjusted according to the printing medium width and frictional resistance characteristics. This ensures each printing medium receives the minimum necessary current for reliable feeding without wasting energy on excessive current.
4Device complexity
If a fixed maximum drive current is used for all printing medium widths, then the system is simple to control, but the power peak increases and heat generation occurs
Solution Approach 1:
The drive current parameter is changed based on printing medium width detection, avoiding the fixed maximum current that causes heat generation. This dynamic parameter adjustment reduces power peaks and heat generation while maintaining feeding reliability.
5Reliability
If the drive current is increased to ensure feeding of all printing medium types, then feeding reliability improves, but acoustic noise increases
Solution Approach 1:
The drive current parameter is optimized according to printing medium width, using only the necessary current for each specific case. This avoids excessive current that generates acoustic noise while maintaining sufficient feeding reliability for all printing medium types.
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 solution reduces power peak, minimizes heat generation, decreases acoustic noise, and enhances printing throughput by optimizing drive current based on the medium's width, while also lowering costs and printer size through efficient power management.
Implementation Method 1
a reading device for reading the information about the drive current from the printing medium
Implementation Method 2
the frictional force of the label sheet between a platen and a line thermal head becomes smaller as the label sheet is narrower
Data Source
AI summary
A printer capable of printing with high quality by driving the drive motor according to information about a drive current to be applied to a drive motor of a platen roller to feed the printing medium, each of which has the information. Accordingly, the printer comprises the printing medium discrimination sensors to read information about the drive current from the printing medium and the control circuit to adjust the drive current to be applied to the feeding motor according to the information about the drive current for the printing medium.