Roll Media Conveyance Load Switching to Prevent Wrinkles
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Solution Overview
Problem
Existing printing apparatuses experience positional displacement and wrinkle formation in media during conveyance, leading to reduced printing accuracy due to the interaction of the medium with conveyance rollers.
Innovation Solution
A conveyance control method and apparatus that includes a conveyance unit with a first and second driving roller pair, where the control unit alternates the rotation and pressing load of the first driving roller to manage intermittent conveyance and tension, minimizing medium displacement and wrinkle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the intermediate roller pair conveys the medium with constant pressing load, then the medium is conveyed stably, but wrinkles form in the medium during intermittent conveyance
Solution Approach 1:
The pressing load of the intermediate roller pair is changed dynamically according to the conveyance state. During conveyance, a first pressing load is applied to maintain stability; during stop, a second pressing load (smaller or zero) is applied to eliminate wrinkles. This dynamic adjustment resolves the contradiction between conveyance stability and printing accuracy.
Solution Approach 2:
The pressing load is applied periodically, switching between first pressing load during conveyance periods and second pressing load during stop periods. This periodic action allows the system to maintain stability when needed while preventing wrinkle formation during pauses, thereby resolving the contradiction.
2Manufacturing precision
If the pressing load is increased to prevent wrinkles, then printing accuracy improves, but the medium may break or skew during conveyance
Solution Approach 1:
The pressing load is adjusted dynamically based on the conveyance phase. During conveyance, a moderate first pressing load prevents breaking while allowing movement; during stop, a reduced second pressing load eliminates wrinkles without causing skewing. This dynamic approach resolves the contradiction between printing accuracy and medium integrity.
Solution Approach 2:
The pressing load parameter is changed according to the conveyance state, using different load values for conveyance and stop phases. This parameter adjustment allows the system to achieve high printing accuracy during stops while maintaining medium integrity during conveyance.
3Reliability
If the pressing load is reduced to prevent medium breaking, then medium integrity is maintained, but wrinkles form reducing printing accuracy
Solution Approach 1:
The pressing load is dynamically adjusted to be moderate during conveyance (preventing breaking) and reduced during stop (allowing wrinkle elimination through controlled tension release). This dynamic adjustment resolves the contradiction between medium integrity and printing accuracy.
Solution Approach 2:
The pressing load is applied periodically with higher values during conveyance to maintain integrity and lower values during stop to enable wrinkle removal. This periodic variation in pressing load resolves the contradiction between medium integrity and printing accuracy.
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
The solution effectively reduces medium displacement and wrinkle formation, maintaining printing accuracy by controlling the intermittent conveyance and tension through alternating roller rotation and load management.
Implementation Method 1
the first driving roller is rotated and stopped in an alternate manner in an intermittent conveyance of conveying and stopping the medium in an alternate manner
Implementation Method 2
a load changing unit configured to change a pressing load acting between the second driving roller and the second driven roller
Implementation Method 3
the intermediate roller pair includes a second driving roller and a second driven roller configured to sandwich the medium together with the second driving roller
Implementation Method 4
the conveyance roller pair includes a first driving roller and a first driven roller configured to sandwich the medium together with the first driving roller
Data Source
AI summary
A conveyance unit includes a feeding unit that feeds a medium from a roll, a conveyance roller pair that conveys the medium toward a printing unit, an intermediate roller pair that conveys, toward the conveyance roller pair, the medium fed by the feeding unit, a first driving unit that rotates a first driving roller, and a load changing unit that changes a pressing load acting between a second driving roller and a second driven roller. A control unit can execute a first control that controls the load changing unit such that the pressing load is a first pressing load when the first driving roller is rotated in an intermittent conveyance, and execute a second control that controls the load changing unit such that the pressing load is not generated when the rotation of the first driving roller is stopped in the intermittent conveyance.