Multipart Long Knife Clamping Strip Mechanism
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Solution Overview
Problem
Existing long knives used for cutting rubberized and non-rubberized steel cord, rubber sheets, industrial textiles, and metals face high wear and costly maintenance due to material adhesions and the difficulty in replacing blades, especially with fine hard metal alloys that are hard to solder.
Innovation Solution
A multi-part long knife design featuring a knife carrier with a clamping strip that guides a blade with inclined clamping surfaces, allowing for secure clamping without additional fasteners, enabling easy blade replacement and adaptation to different materials and thicknesses, and reducing the risk of blade detachment during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldering is used to attach the blade to the blade holder, then the connection stability is improved, but the blade replacement capability deteriorates and manufacturing complexity increases
Solution Approach 1:
The blade attachment system is segmented into a blade holder with clamping surfaces and a movable clamping strip that can be independently actuated. This allows the blade to be securely held during operation yet easily released for replacement by moving only the clamping strip, resolving the contradiction between stable connection and easy replacement.
Solution Approach 2:
The clamping strip is designed to be movable relative to the blade holder along the clamping direction, transitioning between a clamping position (for stable connection during cutting) and a release position (for easy blade replacement). This dynamic mechanism eliminates the need for permanent soldered connections while maintaining reliability during operation.
2Duration of action of stationary object
If high-quality materials such as carbide are used for the blade, then the service life and temperature resistance are improved, but the manufacturing cost and difficulty increase
Solution Approach 1:
The cutting tool is divided into a reusable blade holder (made of less expensive cutting steel) and replaceable blades (made of expensive carbide materials). This segmentation allows the expensive carbide blades to be used only when needed for high-wear applications, while the blade holder can be reused with different blades, reducing overall manufacturing costs and complexity.
Solution Approach 2:
The blade attachment mechanism uses mechanical clamping forces rather than thermal processes (soldering), enabling the use of ultra-fine carbide alloys that cannot be soldered. This parameter change in the attachment method expands material compatibility and reduces manufacturing difficulties.
3Device complexity
If adhesive bonding methods are used to attach the blade, then the manufacturing complexity is reduced, but the reliability under high stress deteriorates
Solution Approach 1:
The patent replaces chemical bonding (adhesive) with a mechanical clamping system involving a movable clamping strip and inclined clamping surfaces. This mechanical system provides reliable stress resistance during cutting operations while maintaining ease of manufacture and blade replaceability, overcoming the limitations of both soldering and adhesive bonding.
Data Source
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AI summary
The invention relates to a multipart long knife (10) for cutting rubberized and non-rubberized steel cord, rubber sheets with or without fibre reinforcement, industrial textiles, steel sheets and non-ferrous metals, having an elongate knife carrier (12) on which at least one elongate blade (16) having a cutting edge (18) is held. According to the invention, the knife carrier (12) has a clamping strip (14) which is guided in a clamping direction (K) in a recess (22) in the knife carrier (12), wherein a receptacle (46) for the blade (16) is formed between the knife carrier (12) and the clamping strip (14) guided in the recess (22), wherein a first clamping face (50) is formed on the knife carrier (12) and a second clamping face (52), located opposite the first clamping face (50), is formed on the clamping strip (14), the blade (16) being able to be clamped in place between said clamping faces.