V-Shaped Wire Shears for Clean Cutting of Flexible Wires
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Solution Overview
Problem
Existing devices for cutting wires to length, particularly those with flexible or stranded wires, often result in unclean cutting patterns and risk jamming due to the geometry of the blades, leading to unreliable cutting performance.
Innovation Solution
A device with a pair of scissors featuring V-shaped blades that can rotate about an axis driven by a motor, where one blade is fixed and the other is rotatable, allowing for optimal cutting speed and alignment to ensure a clean cut, independent of wire flexibility, with a rounded transition area to facilitate manufacturing and sharpening, and a hardened blade for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional blade geometry is used for cutting wires, then solid wires can be cut with sufficient quality, but flexible and stranded wires result in unclean cuts and risk jamming
Solution Approach 1:
The patent changes the geometric parameters of the cutting blades by introducing a V-shaped cross-section with specific flank angles (α and β) relative to the wire axis. This parameter modification allows the blade to effectively cut both solid and flexible/stranded wires by creating a cutting geometry that accommodates wire deformation during the cutting process, thereby resolving the contradiction between cutting reliability and cutting quality across different wire types.
2Ease of operation
If the blade axis is perpendicular to the wire path, then cutting is simple, but the wire dwell time on the blades is too long resulting in poor cutting quality
Solution Approach 1:
The patent introduces rotational motion of the blade around its axis during the cutting process. This dynamic element reduces the wire's dwell time on the blade by creating a sweeping cutting action, which improves cutting quality while maintaining operational simplicity. The rotation speed and angle are optimized to ensure effective cutting without excessive complexity.
3Ease of manufacture
If V-shaped blades are constructed from two separate pieces, then manufacturing and resharpening are simplified, but the wire tends to be pinched during cutting
Solution Approach 1:
The patent merges the two separate blade pieces into a single monolithic V-shaped blade structure. This integration eliminates the gap between blade pieces that causes wire pinching, thereby improving cutting reliability. The unified structure maintains the V-shaped geometry for effective cutting while preventing wire deformation and jamming issues.
4Duration of action of stationary object
If the blade is hardened for cutting metal wires, then service life increases, but grinding and sharpening becomes significantly more difficult
Solution Approach 1:
The patent applies local quality by hardening only the cutting edges of the blade while keeping the body of the blade with a more ductile structure. This selective hardening increases service life at the critical cutting surfaces while maintaining ease of sharpening for the bulk material. The transition area with rounded geometry facilitates this differential treatment and enables effective sharpening even of hardened surfaces.
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
The solution achieves a clean and reliable cutting process across various wire types, including fine stranded and solid materials, with improved service life and reduced wear, while maintaining effective cutting performance and ease of control.
Implementation Method 1
at least one of these blades is rotatable about an axis by at least one motor
Implementation Method 2
it is rounded in a transition area between the flanks of the V-shape... A radius between 0.3 mm and 1 mm has proven effective for the rounding
Implementation Method 3
To enable grinding of at least one single-piece V-shaped blade, it is rounded in a transition area... At least one blade is hardened
Data Source
AI summary
A device (1) is used for processing an axially drawn wire (2). The device (1) includes shears (3) positioned in one direction of travel of the wire (2). These shears (3) have blades (4, 5) for cutting the wire (2). The blades (4, 5) are rotatably mounted by a motor (7). To achieve high reliability and a clean cut, the blades (4, 5) are V-shaped and spaced apart from the wire (2) in a cutting plane (13) of the shears (3). The cutting plane (13) forms an angle of no more than 30° with the path of the wire (2).