Paper Curl Correction via Dynamic Ironing Angle Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional paper conveyance mechanisms struggle with curl correction of paper drawn from roll paper, as the curl intensity varies with roll diameter, leading to unsatisfactory correction and potential reverse curling due to inconsistent force application.
Innovation Solution
A paper conveyance mechanism with an ironing part and a pressing part that adjusts the interior angle of the paper based on roll diameter changes, using an arm to move the pressing part and vary the ironing force according to curl intensity, while also controlling conveying speed to optimize curl correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant force is applied for curl correction, then the correction process is simple, but the correction effectiveness is poor due to varying curl intensity with roll diameter
Solution Approach 1:
The pressing part is made movable relative to the ironing part, allowing the interior angle to be dynamically adjusted. As the roll diameter decreases and curl intensity increases, the pressing part moves to reduce the interior angle, thereby increasing the ironing force. This dynamic adjustment resolves the contradiction by making the correction force adaptive rather than constant.
Solution Approach 2:
The interior angle formed by the paper at the ironing part is changed as a control parameter. By varying the interior angle according to roll diameter, the ironing force is adjusted to match the varying curl intensity. This parameter change enables effective curl correction across different roll sizes without requiring complex multi-component systems.
2Manufacturing precision
If the pressing part is moved to increase ironing force for smaller rolls, then curl correction effectiveness improves, but the device complexity increases
Solution Approach 1:
Instead of using multiple pressing parts or complex adjustment mechanisms, the patent employs a single movable pressing part whose position changes dynamically. This simple dynamic structure achieves variable ironing force without increasing device complexity, as the movement can be driven by the natural variation in roll diameter or a simple actuation mechanism.
Solution Approach 2:
The patent changes the geometric parameter (interior angle) of the existing ironing configuration rather than adding new components. By adjusting the angle through which the paper is bent at the ironing part, the ironing force is varied effectively. This approach maintains structural simplicity while achieving the desired variable correction force.
3Manufacturing precision
If high ironing force is applied to correct strong curl from small rolls, then curl correction improves, but reverse curling and excessive friction may occur
Solution Approach 1:
The movable pressing part enables dynamic control of ironing force, applying higher force only when needed for smaller rolls with stronger curl. For larger rolls with weaker curl, the pressing part remains in a position that applies gentler force. This dynamic adaptation prevents reverse curling and excessive friction that would occur with constant high force application.
Solution Approach 2:
By changing the interior angle parameter based on roll diameter, the ironing force is precisely controlled to match the actual curl intensity. This prevents application of excessive force that would cause reverse curling or excessive friction, while still providing sufficient force for strong curl correction when needed.
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
Effectively corrects paper curl based on its intensity by adjusting the ironing force and conveying speed, preventing reverse curling and excessive friction, ensuring smooth paper handling across different roll diameters.
Implementation Method 1
an ironing part for correcting paper curl which is brought into contact with the surface of the paper on the other side
Implementation Method 2
a pressing part which presses the surface of the paper from the one side to bend the paper at the ironing part
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
The invention provides a paper conveyance mechanism capable of curl correction of paper drawn out from roll paper according to the intensity of curl. The paper conveyance mechanism 10 comprises an ironing part S which is brought into contact with an outer surface Po of the paper P to correct curl of the paper P, a pressing part which presses the paper P from one side to bend the paper P at the ironing part S, and an arm 6 engaged with an outer circumferential surface R1 of the roll paper R to be operated according to a change in a roll diameter of the roll paper R. An upstream-side pressing part F1 is moved from the one side toward the other side in association with an operation of the arm 6 during at least part of a period of the operation of the arm 6 to reduce an ironing angle α formed in the paper P bent at the ironing part S according to a decrease in the roll diameter.