Circular Knife Axial Positioning with Spring-Elastic Spacer
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Solution Overview
Problem
Existing cutting devices face challenges in comfortably and reproducibly positioning the cutting edges of circular knives against the cutting grooves of a counter-knife shaft without risking damage during pivoting, requiring additional tools to adjust the distance between the knives.
Innovation Solution
Incorporating a spring-elastic spacer device between the circular knives and axial stop devices on both sides of the knife arrangement, allowing for adjustable positioning and distance control between the knives, enabling reduced distance during pivoting and precise alignment without additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between circular knives is reduced during pivoting to prevent damage, then the risk of damage to cutting edges is reduced, but the positioning precision and ease of operation deteriorates requiring additional tools
Solution Approach 1:
The spacer device is designed with elastic elements that allow dynamic adjustment of the distance between circular knives. During pivoting, the elastic elements compress to reduce the distance between knives, preventing damage. After pivoting, the elastic elements expand to restore the knives to their working distance, eliminating the need for additional adjustment tools.
Solution Approach 2:
The invention changes the physical state of the spacer device between compressed and expanded states. The elastic elements store and release mechanical energy to automatically adjust the knife distance parameter during pivoting and working cycles, providing both protection during pivoting and proper positioning during cutting.
2Measurement precision
If additional tools are used to adjust knife distance during pivoting, then positioning precision is maintained, but device complexity and ease of operation worsen
Solution Approach 1:
The elastic spacer device performs the adjustment function automatically using stored elastic energy. The system serves itself by compressing during pivoting and expanding during cutting without requiring external tools or complex adjustment mechanisms, maintaining precision while simplifying the overall device.
3Adaptability or versatility
If the knife holder position is changed to position circular knives, then positioning flexibility is improved, but positioning reproducibility and ease of operation deteriorates
Solution Approach 1:
The invention separates the positioning function into two independent parts: the knife holder remains fixed in its position on the knife shaft, while the circular knives themselves are positioned relative to the holder using the elastic spacer device. This segmentation allows the holder position to remain reproducible while providing flexibility in knife positioning through the adjustable spacer mechanism.
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
Enables convenient and reproducible positioning of circular knives relative to the counter-knife shaft, maintaining knife holder position and ensuring precise alignment, reducing the risk of damage and eliminating the need for separate aids to adjust knife distance.
Implementation Method 1
a spring-elastic spacer device arranged between the circular knives of the knife arrangement
Data Source
Figure 1
Figure 2
AI summary
The knife (14) has a knife arrangement (17) arranged on a base body (16) i.e. shaft hub, of a knife holder (15). The arrangement has circular knives (18, 19), that are coaxially arranged in parallel relative to each other and placed at a distance of a cutting breadth from each other by a spring-elastic spacer device (39). Shaft nuts (37, 46) are arranged on both sides of the knife arrangement. Axial positions of the shaft nuts on the base body of the knife holder are varied. A fastening collar (33) fastens the holder on an upper knife shaft.