Printing Apparatus Label-Peeling Feedback Control for Reduced Meandering
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Solution Overview
Problem
In printing apparatuses with label peeling mechanisms, tension imbalances can lead to slippage between transport rollers and label paper, causing meandering and skewing, despite efforts to maintain a balanced tension.
Innovation Solution
A printing apparatus with a peeling unit featuring a rotatable peeling plate and a control unit that performs feedback control based on detection of label paper end positions to stabilize the peeling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the transport force of the peeling roller is set and controlled not to exceed a label holding force of the transport roller, then the tension balance is maintained, but a slight slip occurs and meandering or skew occurs when disturbance acts
Solution Approach 1:
The patent applies feedback control by detecting the position of the label paper end using a detection unit and adjusting the peeling plate angle accordingly. The control unit receives detection results and modifies the peeling plate driving unit to maintain proper tension balance and prevent slippage or meandering during transport, resolving the contradiction between maintaining tension balance and ensuring reliable transport under disturbances
2Reliability
If the peeling plate angle is adjusted to maintain tension balance, then slippage is prevented, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The system uses a detection unit to monitor label paper position and a control unit to adjust the peeling plate angle accordingly, creating a closed-loop feedback system that maintains transport stability while managing complexity through intelligent control
Solution Approach 2:
The peeling plate is designed to be rotatable about a support shaft, allowing dynamic adjustment of the peeling angle during operation. This dynamic capability enables the system to adapt to varying tension conditions and maintain optimal transport stability without requiring an overly complex mechanical structure
Data Source
AI summary
A printing apparatus includes a print head, a peeling unit that peels a label from backing paper, a transport roller disposed upstream of the peeling unit on a transport path of label paper, a peeling roller disposed downstream of the peeling unit on a transport path of the backing paper, a detection unit that detects an end position of the label paper, and a control unit, the peeling unit includes a peeling plate that can rotate on the same plane as a surface of the label paper with a rotation shaft as a fulcrum, and a third motor that rotates the peeling plate with a support shaft as a fulcrum, and the control unit performs feedback control on the third motor based on a detection result of the detection unit so that a variation in the end position of the label paper is reduced.