Segmented Roller Knife Edge Trimming for Thick Cord Strips
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Solution Overview
Problem
Conventional edge trimming devices struggle with thick steel or textile cord strips, as they require high cutting forces and often result in inadequate splice strength due to uneven matrix distribution and thread spacing.
Innovation Solution
A device featuring two non-contacting roller knives that make partial cuts on the top and bottom, followed by a trailing knife for final separation, reducing cutting forces and ensuring precise edge trimming and strong splices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional knives with fixed blade are used to cut thick cord strips, then cutting action is achieved, but very high cutting forces are required making reliable production use difficult
Solution Approach 1:
The cutting process is divided into multiple stages: first roller knives make partial cuts at the top and bottom of the cord strip, then a second knife completes the cut through the remaining central portion. This segmentation reduces the cutting force required at each stage, making reliable production use possible.
Solution Approach 2:
The roller knives perform preliminary cutting actions by making partial incisions at the top and bottom edges of the cord strip before the final cutting knife acts. This preliminary action reduces the remaining material thickness that the final knife must cut through, significantly lowering the required cutting forces.
2Force
If roller knives are used to trim thick strips, then cutting forces are easier to control, but the edges do not always offer the required strength in the splice
Solution Approach 1:
The cutting process is segmented into two distinct phases: roller knives make controlled partial cuts that reduce material thickness while maintaining edge integrity, then a final knife completes the separation. This segmentation ensures both可控 cutting forces and sufficient edge strength for splicing.
Solution Approach 2:
Different cutting elements are applied to different portions of the cord strip: roller knives handle the top and bottom portions with controlled forces, while the final knife completes the cut in the central region. This localized approach ensures optimal cutting forces at each location while maintaining overall edge strength for splicing.
3Adaptability or versatility
If thick cord strips are used, then application requirements are met, but edge trimming becomes problematic due to high cutting forces
Solution Approach 1:
The edge trimming process is segmented into multiple cutting stages using different elements (roller knives followed by a final knife). This segmentation makes the manufacturing process feasible for thick cord strips by distributing the cutting action across multiple lower-force operations rather than a single high-force operation.
Solution Approach 2:
Roller knives perform preliminary cutting actions on thick cord strips by making partial incisions at the top and bottom, reducing the remaining material thickness before the final knife completes the cut. This preliminary action makes edge trimming feasible for thick strips that would otherwise require prohibitively high cutting forces.
Data Source
Figure 1
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Figure 3~4
AI summary
Device and method for edge trimming the edges of a steel or textile cord strip, consisting of an elastic matrix with inserted steel or textile threads running parallel to each other, with two roller knives (5, 6) arranged one above the other and not in cutting contact with each other, which cut the matrix (22) on the top and bottom, and a knife (11) downstream of these, which completes the cut.