Fan-Folded Label Web Creasing with Optical Gap Detection

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Solution Overview

Problem

Existing fan-fold web formation technologies face challenges in maintaining accurate crease registration due to web speed fluctuations and label variations, leading to potential damage and misregistration of labels, especially when web movement is perturbed.

Innovation Solution

An off-line creasing station with synchronized die rollers and an optical reader system that adjusts the rotation rate of the die rollers independently of web movement, ensuring precise crease formation between labels, even with perturbations, using a coupling mechanism and controller to maintain accurate crease placement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the creasing mechanism is mechanically coupled with die rolls to ensure synchronized crease formation, then crease registration accuracy is improved, but the system becomes less flexible and more sensitive to web speed fluctuations and label variations

Engineering Contradiction:

Improvecrease registration accuracyVSAvoidsystem flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent replaces the mechanical coupling between web transport and die rolls with an optical detection system and independent drive mechanism. The reader detects label positions optically, and the controller independently adjusts die roll rotation based on detected position data, eliminating mechanical synchronization constraints and enabling adaptation to web speed variations without compromising crease registration accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces dynamic adjustment capability where the rotation rate of die rolls can be independently modified in real-time based on web conditions. The controller receives position data from the reader and dynamically adjusts die roll speed to maintain accurate crease placement even when web speed fluctuates, making the system adaptive rather than rigid

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the rotation rate of die rolls is adjusted independently of web feed rate, then adaptability to web perturbations is improved, but device complexity increases due to additional control mechanisms

Engineering Contradiction:

Improveadaptability to web perturbationsVSAvoidcontrol mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a feedback control loop where the reader continuously detects label positions on the moving web, sends position data to the controller, which then adjusts die roll rotation rates accordingly. This closed-loop feedback system enables automatic compensation for web speed variations and label position variations without requiring complex manual control mechanisms

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces a controller as an intermediary between the reader and die rolls. The controller processes position data from the reader and generates appropriate control signals to adjust die roll rotation, simplifying the overall control architecture while enabling independent adaptation of die roll speed to web conditions

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If high web tension is applied to maintain web stability during creasing, then web stability is improved, but label damage risk increases

Engineering Contradiction:

Improveweb stabilityVSAvoidlabel damage risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical web tensioning with an optical detection and independent die roll control system. By detecting label positions optically and independently adjusting die roll rotation rates, the system can maintain accurate crease registration without applying high tension to the web, thereby stabilizing the web through control precision rather than mechanical force

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8939877B2Method and apparatus for forming fan-folded web of labels with improved registration

Publication Date: 2015.01.27 CENTURY PRINTING & PACKAGING

AI summary

An off line apparatus for converting a rolled web into a fan-fold web and method of fan folding a web is described. The apparatus has a creasing station capable of receiving the web at a feed rate. The creasing station has a first die roller, wherein the first die roller comprises a first blade and a first cushion, and a second die roller. A coupling mechanism synchronizes rotation of the rollers such that the first blade engages the second cushion and the second blade engages the first cushion during one each rotation. A reader determines the location of a gap between the labels. A controller receives the location of the gap from said reader and communication with a drive mechanism to adjust the rotation rate such that the first blade and the second cushion engage.