Motor-Operated Shears With Transverse Blade Spacing Against Jamming
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Solution Overview
Problem
Conventional motor-operated shears often experience jamming issues during the cutting process, particularly when cutting materials like cable harnesses, which can prevent successful cutting and impede the blades' return to their home position.
Innovation Solution
The blades are intentionally spaced apart transversely to the cutting movement at the end of the cutting process to prevent jamming, allowing them to return to their home position effectively, with mechanisms such as bending an axle body or using a plunger to create a gap between the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blades flatly adjoin one another in the cutting plane during cutting, then cutting precision is improved, but material jamming occurs between the blades
Solution Approach 1:
The patent introduces a transverse dimension to the blade arrangement by tilting the blades relative to each other around the cutting axis. Instead of maintaining perfect coplanarity, the blades are angled such that their cutting edges form a transverse offset, creating a three-dimensional cutting geometry that prevents material jamming while preserving cutting effectiveness
Solution Approach 2:
The patent extracts the harmful jamming effect by intentionally creating a gap between the blades in the transverse direction. This gap removes the constraint that causes material to become trapped between the blades, allowing the material to be cleanly severed without obstruction
2Reliability
If the blades are spaced apart transversely to prevent jamming, then reliability is improved, but cutting precision deteriorates
Solution Approach 1:
The patent applies local quality by creating a transverse tilt specifically in the region where blades approach each other during cutting, while maintaining precise alignment in the cutting plane. The tilt angle is localized to the blade geometry rather than affecting the entire blade structure, ensuring that cutting precision is preserved where needed while preventing jamming through the transverse offset
3Productivity
If material is jammed between the blades, then cutting cannot be completed, but blade return to home position is also impeded
Solution Approach 1:
The patent applies preliminary action by pre-tilting the blades in the transverse direction before the cutting process begins. This pre-configured geometry ensures that as the blades close during cutting, they naturally follow a path that prevents material entrapment, thereby preventing both cutting failure and subsequent return movement obstruction before they can occur
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 solution enhances the functional reliability of motor-operated shears by ensuring successful cutting and smooth return of the blades to their home position, preventing material jamming and maintaining efficient operation.
Implementation Method 1
the axle body can be bent in order to space apart the blades
Data Source
AI summary
A motor-operated shears which includes two blades that can move towards each other to perform a shearing movement is provided. In order to advantageously improve functional safety, towards the end of the movement, the blades are acted upon in a direction running transversely to the movement so as to keep the blades at a distance from one another in said direction.