Band Knife Cutting Machine With Single-Bending Deflection
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Solution Overview
Problem
Existing cutting machines with counter-rotating knives face challenges in achieving long service life due to high stress in deflection devices and difficulty in making contour cuts, as they require large machine areas and are prone to premature knife fatigue from reverse bending changes.
Innovation Solution
A cutting machine design featuring a revolving band knife guided in opposite directions with deflection devices that only perform single bending changes, reducing stress on the band knife and allowing for a compact design, along with optional features like cutter disk devices, knife guides, and a grinding apparatus for consistent cutting quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If counter-rotating knives are used to improve cutting quality and speed, then cutting precision is improved, but the service life of the knives decreases due to high stress in deflection devices
Solution Approach 1:
Instead of having the band knife rotate in a conventional manner with deflection devices causing reverse bending, the patent inverts the approach by guiding the band knife in opposite directions through deflection devices that only perform single bending changes. This inversion of the bending direction eliminates the harmful reverse bending cycles while maintaining the counter-rotating cutting action, thus preserving knife service life while achieving high cutting precision
2Adaptability or versatility
If a large frame is used to allow the band knife to rotate above the material, then the cutting machine can handle various materials, but the machine size increases
Solution Approach 1:
The patent transitions from a conventional horizontal rotation of the band knife above the material to a vertical guidance system where the band knife is guided in opposite directions through deflection devices. This dimensional change allows the cutting edge to remain engaged with the material throughout the rotation, eliminating the need for a large frame and reducing machine size while maintaining versatility
3Adaptability or versatility
If the band knife is twisted by a rotary knife head to make contour cuts, then cutting versatility is improved, but the service life of the band knife decreases due to great stress
Solution Approach 1:
The patent segments the cutting function by separating the contour guidance function from the cutting function. The deflection devices are divided into multiple units (first and second deflection devices) that independently guide the band knife in opposite directions. This segmentation allows contour cutting capability while distributing the stress more evenly, preventing the concentration of great stress that would reduce band knife service life
Data Source
Figure 1~3
Figure 4
AI summary
In a cutting machine (1) with a rotating band blade (3), wherein the band blade (3) is moved in opposite directions in a circulation section (5) of the band blade (3) that forms a cutting section (7), and with a first and a second deflection device (9, 11) for redirecting and returning the band blade (3), provision is made that the first and the second redirection device (9, 11) each deflect the band blade without a reverse bending cycle and return it again.