Label Printer Peeling Roller Current Control
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Solution Overview
Problem
In label printers, temporary disturbances in motor current and motor variations can lead to excessive transport force of the peeling roller, causing slippage between the transporting roller and the label sheet, which reduces transport accuracy and degrades printing quality.
Innovation Solution
A label printer configuration with a control unit that adjusts the current supplied to the peeling motor to ensure the transport force of the peeling roller is equal to or greater than the minimum force required for peeling, while being greater than the maximum friction force between the peeling roller and the backing sheet, and sets the maximum friction forces between the peeling and transporting rollers to maintain acceptable transport error, ensuring reliable peeling and printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transport force of the peeling roller is increased to ensure reliable peeling, then peeling reliability is improved, but slippage occurs between the transporting roller and the label sheet, reducing transport accuracy and printing quality
Solution Approach 1:
The patent applies parameter changes by precisely controlling the current value supplied to the peeling motor to maintain transport force within a specific range. The control unit adjusts the current to ensure the transport force is equal to or greater than the minimum force required for peeling while being greater than the maximum friction force between the peeling roller and backing sheet, preventing excessive force that would cause slippage and maintain transport accuracy.
Solution Approach 2:
The patent implements feedback control where the control unit continuously monitors and adjusts the current value to the peeling motor based on the relationship between transport force and friction force. This feedback mechanism ensures the transport force remains within the acceptable range, balancing peeling reliability and transport accuracy by comparing actual performance against predefined force thresholds.
2Adaptability or versatility
If the current value to the peeling motor is not controlled, then the peeling roller can handle individual motor variations, but temporary disturbances in current and motor variations cause excessive transport force, leading to slippage and degraded printing quality
Solution Approach 1:
The patent uses parameter changes by establishing specific current value ranges for the peeling motor that account for individual motor variations. The control unit adjusts the current within this range to maintain transport force that is sufficient for peeling but controlled enough to prevent slippage, thereby maintaining printing quality despite motor variations and temporary disturbances.
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 reliable peeling of labels while preventing excessive force that could degrade printing quality, ensuring accurate transport and maintaining acceptable transport errors, thus achieving both reliable peeling and high printing quality.
Implementation Method 1
the maximum friction force between the peeling roller and the backing sheet
Implementation Method 2
the maximum friction force between the transporting roller and the label sheet
Data Source
AI summary
A label printer includes a print head, a transporting roller, a peeling roller, and a control unit, wherein the control unit controls a current value to be supplied to a peeling motor configured to rotate the peeling roller such that a transport force of the peeling roller for transporting the backing sheet is equal to or greater than a minimum force required for peeling the label and is greater than a maximum friction force between the peeling roller and the backing sheet, and the maximum friction force and a maximum friction force between the transporting roller and the label sheet are set such that the maximum friction force between the peeling roller and the backing sheet is equal to or smaller than a transport force of the peeling roller that sets a transport error of the label sheet by the transporting roller to be within an acceptable value.