Pinking Shears with Spaced Blades and Roller Guide
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Solution Overview
Problem
Pinking shears in existing technologies experience blade warping and increased friction due to heat generation when the scissor blades are pressed together, leading to suboptimal cutting performance and reduced service life.
Innovation Solution
The scissor blades are designed to be spaced apart, with cutting planes guided parallel to each other without contact, eliminating friction and allowing for the use of non-heat-resistant materials, and featuring a guide device with roller bearings for low-friction movement and adjustable spacing to enhance cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the scissor blades are pressed against one another during cutting, then the cutting force is increased, but the blades heat up and warp
Solution Approach 1:
The patent introduces a guide device with guide surfaces as an intermediary between the two scissor blades. This guide device ensures that the blades move parallel to each other without direct contact, eliminating friction and heat generation while maintaining effective cutting force through the guided motion path.
2Productivity
If the scissor blades are pressed against one another, then the cutting action is enhanced, but friction increases and heat is generated
Solution Approach 1:
The guide device acts as a mediator that directs the cutting action without requiring blade contact. The guide surfaces provide a low-friction path for blade movement, reducing energy loss to friction while maintaining high cutting performance through the enforced parallel motion.
3Temperature
If the cutting planes are spaced apart without contact, then friction and heat are eliminated, but cutting force may be reduced
Solution Approach 1:
The patent employs dynamic guidance through the guide device, which actively maintains the optimal parallel spacing and motion of the blades during cutting. This dynamic control ensures that the spaced blades maintain effective cutting force through controlled motion rather than relying on contact pressure.
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
This design achieves precise cutting results, extends tool life, and simplifies maintenance by preventing blade distortion and allowing for frequent resharpening, while enabling larger cutting strokes and higher performance with reduced friction.
Implementation Method 1
A roller bearing is arranged between the first guide surface and the front side of the first scissor blade
Data Source
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AI summary
The invention relates to pinking shears (10) with two shears blades (12, 14) which can be moved relative to one another, wherein a first shears blade (12) is assigned a first cutting plane (20), wherein a second shears blade (14) is assigned a second cutting plane (22), and where the first cutting plane (20) and the second cutting plane (22) are spaced apart from one another.