Buckle Folding Roller Layout for Mixed-Thickness Sheet Handling
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Solution Overview
Problem
Existing folding machines struggle to process printing substrates with different properties in a high-quality and highly productive manner, particularly when overlapping sheets cause issues in the folding process.
Innovation Solution
A folding device with two folding rollers forming a common folding nip, featuring a first insertion slot with a first insertion plane and a second insertion slot with an inclined second insertion plane, allowing selective insertion of folding pockets to manage sheets with varying properties, and optionally using sheet diverters to optimize the folding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single insertion slot with a single insertion plane is used for folding pockets, then the device structure is simple, but it cannot process printing substrates with different properties (especially different thicknesses) in a high-quality and highly productive manner
Solution Approach 1:
The single insertion slot is divided into multiple insertion slots (first insertion slot and second insertion slot), each with its own insertion plane. This segmentation allows different folding pockets to be selectively inserted into different slots depending on the substrate properties, thereby improving adaptability while maintaining manageable device complexity through modular design.
Solution Approach 2:
The device enables dynamic selection of insertion slots based on the specific folding task and substrate properties. The folding pockets can be selectively inserted into different insertion slots (with different inclination angles) depending on the requirements, allowing the system to adapt its configuration dynamically rather than being fixed, thus improving versatility without excessive complexity.
2Manufacturing precision
If folding pockets are selectively inserted into different insertion slots, then substrate processing quality improves, but the operation complexity increases
Solution Approach 1:
Each insertion slot is designed with a specific local quality (inclination angle) optimized for particular substrate types. The first insertion slot has one inclination angle while the second insertion slot has a different inclination angle. This allows the operator to select the appropriate slot based on substrate properties, improving folding accuracy for different materials while keeping the operational decision-making process straightforward through clear differentiation.
3Productivity
If sheets are fed in an overlapping stream to high-speed folding machines, then productivity increases, but sheet overlap problems occur during the folding process
Solution Approach 1:
The invention addresses the sheet overlap problem by introducing a new dimension - the inclination angle of the insertion planes. By varying the inclination angles of different insertion slots, the device creates different spatial configurations for folding pockets, which helps manage overlapping sheets during high-speed folding. This dimensional variation allows sheets to be processed in an overlapping stream while maintaining folding process stability through optimized geometric arrangements.
Data Source
AI summary
A folding unit has two folding rollers with a common folding nip. A first insertion slot has a first insertion plane for a selectively insertable buckle plate and is configured so that a buckle plate mouth of the buckle plate is at an inlet side of the folding nip. A second insertion slot has a second insertion plane for a buckle plate. The second insertion plane is inclined with respect to the first insertion plane and the second insertion slot is designed for the buckle plate mouth of the selectively inserted buckle plate to be arranged on the inlet side of the folding nip. Printing substrates with different properties are processed in a high-quality and highly productive manner in a pocket folding process, especially in buckle folding units of industrial folding machines.