Label Printer Roller Friction Control
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Solution Overview
Problem
In label printers, temporary disturbances in motor current and individual motor variations can lead to increased 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 transporting roller and a peeling roller, where the control unit adjusts the current supplied to the peeling motor to maintain a transport force between the peeling roller and the backing sheet within specific friction limits, ensuring the peeling roller does not idle and maintains accurate label sheet transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peeling roller transports the backing sheet with excessive force, then the label peels effectively from the backing sheet, but slippage occurs between the transporting roller and the label sheet, reducing transport accuracy
Solution Approach 1:
The patent applies parameter changes by precisely controlling the current value supplied to the peeling motor within a specific range. This control adjusts the transport force of the peeling roller to be not smaller than the minimum force required for peeling but not greater than the maximum friction force between the peeling roller and the backing sheet. By changing and controlling this force parameter, the system achieves effective peeling while preventing excessive force that would cause slippage and transport errors.
2Power
If the current value supplied to the peeling motor varies due to temporary disturbances or motor variations, then the transport force increases, but this causes slippage and reduces transport accuracy
Solution Approach 1:
The patent implements feedback control by continuously monitoring and adjusting the current value supplied to the peeling motor. The control unit ensures that the current remains within a predetermined range, adjusting for temporary disturbances and motor variations. This feedback mechanism maintains the transport force at optimal levels, preventing both insufficient peeling and excessive force that would cause slippage between the transporting roller and label sheet.
3Strength
If the peeling roller applies maximum friction force to peel the label, then peeling is effective, but the transporting roller may slip on the label sheet
Solution Approach 1:
The patent applies local quality by differentiating the friction force requirements for different rollers. The maximum friction force between the peeling roller and the backing sheet is set to be not greater than the transport force of the peeling roller, creating a localized force distribution. This ensures that the peeling roller has sufficient friction for effective peeling while the transporting roller operates within safe friction limits, preventing slippage and maintaining transport reliability.
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 ensures reliable peeling of labels while maintaining acceptable transport errors and printing quality, even with disturbances or motor variations, by controlling the peeling roller's force within optimal friction ranges.
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 configured to perform printing on a label sheet, a transporting roller configured to transport the label sheet downstream, a peeling roller configured to transport a backing sheet in a direction different from a travelling direction of a label to peel the label from the backing sheet, and a control unit configured to control rotation of the transporting roller and rotation of the peeling roller, wherein 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 not greater than a transport force of the peeling roller so as to make a transport error of the label sheet by the transporting roller within an acceptable value.