Rotating Cutter With Spiral Profile For Material Guidance
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Solution Overview
Problem
Existing cutting devices require high power to operate and are inefficient in cutting thick materials, often causing material to escape or become damaged, and are not effective for cutting thin materials like grass.
Innovation Solution
A cutting device with a rotating force member featuring a spiral profile that guides material against a counter construction, ensuring uniform loading and preventing escape, combined with a counter construction that includes toothing and chamfers for efficient cutting, allowing for adjustable cutting methods and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rotating cutting blade with toothing is used to cut thick materials, then the cutting capability for thick materials is improved, but the power requirement increases significantly
Solution Approach 1:
The cutting blade is segmented into multiple cutting edges arranged around the circumference, allowing the material to be processed in sequential segments as the blade rotates, reducing the instantaneous power requirement compared to a single large cutting action
Solution Approach 2:
The cutting action is performed periodically as the blade rotates, with each tooth engaging the material in sequence. This periodic engagement distributes the power requirement over time, reducing peak power demands while maintaining effective cutting capability
2Reliability
If the cutting blade is pressed against brushwood to ensure cutting, then the cutting reliability is improved, but the material may be pushed between the blade and counterpart
Solution Approach 1:
The cutting mechanism transitions from a linear pressing action to a rotational cutting action, utilizing the radial dimension of the rotating blade to engage and cut material. This dimensional change allows cutting without excessive axial pressing force that would push material into gaps
Solution Approach 2:
The rotating blade acts as an intermediary between the material and the counterpart, gradually engaging the material through rotation and guiding it through the cutting zone, preventing direct pushing forces that would drive material into gaps
3Device complexity
If a finger bar cutter with parallel projections is used, then the cutting structure is simplified, but material to be cut escapes from between the projection and force member
Solution Approach 1:
The rotating blade introduces a dynamic cutting action that creates controlled vibrations and motion, preventing material from escaping laterally while maintaining structural simplicity. The rotational motion ensures continuous engagement with the material
Solution Approach 2:
The cutting edges on the rotating blade are asymmetrically positioned and shaped to create a cutting action that naturally contains the material during the cutting process, preventing escape while maintaining a simple overall structure
4Device complexity
If chain crushers without counter construction are used, then the device complexity is reduced, but the cutting point becomes rough and materials are crushed
Solution Approach 1:
The rotating blade with controlled cutting edges serves as an intermediary between the simple rotational mechanism and the material, providing a controlled cutting action that produces clean cuts while maintaining structural simplicity
Solution Approach 2:
The cutting parameters are optimized through the rotation speed, blade geometry, and tooth configuration, allowing for precise control of the cutting action to produce clean cuts without complex counter construction
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3b
AI summary
The invention relates to a cutting device, which includes a frame (10) and a counter construction (11) fitted in the frame (10). The cutting device also includes a force member (12) rotatably supported to the frame (10) and extending in the radial direction up to the counter construction (11), overlapping in the axial direction relative to the axis of rotation (15) of the force member (12). In addition, the cutting device includes equipment (13) for rotating the force member (12) and thereby for cutting material (22) in cooperation with the counter construction (11). The force member (12) includes a profile (14) for taking the material to be cut (22) against the counter construction (11) for cutting the material.