Laser Fold Preparation Pattern Generation for Paper Folding
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Solution Overview
Problem
Existing fold preparation methods using knife shafts in folding machines are difficult to adjust and limited in their ability to create fold preparation patterns for folds perpendicular to the direction of travel, leading to potential position deviations and reduced product quality, especially with thicker products.
Innovation Solution
A method and system that utilize a computer to create job-specific fold preparation patterns by associating job-specific signature characteristics with cutting, trimming, and clipping patterns, allowing for easier adjustments and precise positioning of cutting, trimming, and perforation lines, which can be implemented using a fold preparation device like a laser unit, and are adaptable based on changes in folding machine positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If knife shafts are used for fold preparation, then cutting and creasing operations can be performed, but adjustment difficulty increases and adaptability to different fold configurations decreases
Solution Approach 1:
The patent replaces the mechanical knife shaft system with a laser-based fold preparation system. The laser unit can be precisely positioned and adjusted using computer control to create fold preparation patterns without requiring complex mechanical adjustments of knife shafts. This substitution eliminates the need for dismounting and remounting knife holders during job changes.
Solution Approach 2:
The patent uses computer-controlled parameters (position, speed, power) to adjust the laser fold preparation process. Instead of physically adjusting knife shaft positions, the system changes operational parameters through software, allowing rapid adaptation to different fold configurations and signatures.
2Adaptability or versatility
If knife shafts are used for fold preparation, then cutting lines can be created in the direction of travel, but the ability to create fold preparation for perpendicular folds is limited
Solution Approach 1:
The laser fold preparation unit can perform multiple functions: creating fold preparation patterns in both the direction of travel and perpendicular to it. The laser beam can be positioned and oriented to treat various fold configurations (first buckle folding unit and second buckle folding unit) without requiring separate dedicated mechanisms for each direction.
Solution Approach 2:
The laser system replaces the directional limitation of mechanical knife shafts. While knife shafts can only cut in the direction of travel, the laser beam can be precisely positioned and angled to create fold preparation patterns in any required orientation, including perpendicular folds.
3Manufacturing precision
If knife shafts are used for fold preparation, then material weakening can be achieved, but position deviations occur with thicker products
Solution Approach 1:
The laser system replaces mechanical knife contact with optical energy delivery. The laser can precisely control the depth and distribution of material weakening through parameter adjustment (power, speed, pulse frequency), ensuring consistent fold preparation even for thicker products where mechanical knife pressure varies.
Solution Approach 2:
The computer-controlled laser system can incorporate feedback mechanisms to monitor and adjust fold preparation in real-time, ensuring consistent material weakening and accurate fold positions. The system can compensate for variations in material thickness and properties through controlled parameter adjustments.
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
This approach simplifies the adjustment of fold preparation patterns, reduces operator demands, and ensures accurate fold creation by allowing for customizable and adaptive fold preparation patterns, enhancing the quality of folds and reducing position deviations.
Implementation Method 1
a laser unit for treating, namely cutting, perforating or creasing sheets as they are transported through a printing press
Implementation Method 2
Known lasers for processing paper operate in the infrared (IR) range
Data Source
AI summary
A method for creating a fold preparation pattern includes supplying job-specific signature characteristics to a computer and determining job-specific cutting requirements by using general cutting requirements assigned to respective general signature characteristics in the computer and using the job-specific signature characteristics. The computer accesses a database that contains cutting, trimming, and clipping patterns and compiles job-specific fold preparation patterns in accordance with the job-specific cutting requirements. A computer for implementing the method and a system having the computer are also provided.