Web Folding Apparatus Edge Alignment Control
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Solution Overview
Problem
Existing web folding technologies face difficulties in aligning opposite side edges of a web during the folding process, leading to misalignment and deviation, especially when folding high-speed webs.
Innovation Solution
A folding apparatus and method that includes a folding section, a correction section, a detecting section, and a control section to adjust the web's path by detecting reference portions and altering the tension between the web's side edges, using sensors and contact sections to ensure precise alignment, even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a web is folded in two using conventional folding methods, then the folding operation can be performed, but the opposite side edges cannot be aligned properly, resulting in misalignment
Solution Approach 1:
The patent applies preliminary action by detecting the position of reference portions on the web before the folding operation occurs. The detection section measures the lateral position of edges or patterns upstream of the folding point, and the control section adjusts the conveyance direction in advance to ensure proper alignment when folding occurs, preventing misalignment rather than correcting it afterward.
Solution Approach 2:
The patent implements feedback control by continuously detecting the position of reference portions on the web, comparing the detected position with the target position, and automatically adjusting the conveyance direction through the correction section. This closed-loop control system ensures that edge alignment precision is maintained by real-time feedback during the folding process.
2Manufacturing precision
If the web conveyance direction is not corrected, then the folding process is simple, but the path of the web diverges and edges become misaligned
Solution Approach 1:
The patent uses an intermediary correction section that acts as a mediator between the web conveyance system and the folding operation. This correction section, which may include guide rollers or friction elements, indirectly influences the web path by applying controlled friction or guidance forces, allowing precise path correction without directly manipulating the web or requiring complex mechanical intervention at the folding point.
3Manufacturing precision
If high-speed web folding is performed without path correction, then productivity is high, but edge alignment precision deteriorates
Solution Approach 1:
The patent replaces complex mechanical path correction mechanisms with a detection and control system that uses sensors to detect reference portion positions and electronically controls the conveyance direction. This substitution of mechanical correction systems with detection-control systems enables high-speed operation while maintaining precision, as electronic control can respond faster and more precisely than mechanical adjustment mechanisms.
Data Source
AI summary
A folding apparatus of the present invention comprises a folding section 40 for folding a web W in two so that opposite side edges W1, W2 of the web W are in a predetermined positional relationship with respect to each other; a correction section 90 for correcting a moving direction of the web W by contacting the web W in the folding section 40; a detecting section 41, 103 for detecting a reference portion W1, W2 of the web to be used as a reference in a web folding operation so as to output positional information regarding a position of the detected reference portion W1, W2; and a control section 3 for controlling the correction section 90 based on the positional information so as to change a state of contact of the contact of the correction section 90 with the web W.