Hair Clipper Blade Engagement Reduces Overturning Torque
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Solution Overview
Problem
Conventional hair clipping devices experience an unwanted 'pulling effect' due to overturning torque, leading to inefficient cutting performance and user discomfort, particularly under heavy load conditions, which is often addressed by using large and expensive electric motors or increased blade friction.
Innovation Solution
A hair clipping device design where the eccentric transmission element engages the coupling element within the cutting plane, reducing overturning torque and using ball bearings to minimize friction, allowing for efficient power transmission and improved cutting performance with regular motors and springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor driven eccentric engages the driving bridge at a distance above the movable cutting blade, then the cutting blade can be driven, but an unwanted pulling effect occurs due to overturning torque
Solution Approach 1:
The patent repositions the engagement point of the eccentric transmission element from a vertical position above the cutting plane to a horizontal position within the cutting plane. This dimensional change in engagement location eliminates the vertical lever arm that causes overturning torque, thereby resolving the pulling effect while maintaining power transmission capability
Solution Approach 2:
The patent introduces a coupling element as an intermediary between the eccentric transmission element and the movable cutting blade. This coupling element transmits the driving force while ensuring the engagement occurs within the cutting plane, acting as a mediator that eliminates the harmful torque effect
2Productivity
If large and expensive electric motors are used to overcome the pulling effect, then cutting performance improves, but device size and cost increase
Solution Approach 1:
The patent extracts the source of the pulling effect by repositioning the engagement point within the cutting plane, removing the need for oversized motors. This allows the use of smaller, more compact motors while maintaining cutting performance, as the harmful overturning torque is eliminated through geometric redesign rather than force compensation
3Reliability
If increased blade friction is used to prevent blade lifting, then cutting performance improves, but wear and tear increases
Solution Approach 1:
The patent applies preliminary action by ensuring the cutting blades are properly aligned and positioned within the cutting plane before cutting begins. The coupling element pre-establishes the correct geometric relationship between blades, preventing lifting and reducing wear through proper initial positioning rather than relying on friction
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 effectively eliminates the pulling effect, enhancing cutting performance, reducing wear and tear, and improving user comfort by transmitting forces directly within the cutting plane with minimal friction, leading to longer device operation and safer hair cutting.
Implementation Method 1
using ball bearings to minimize friction
Implementation Method 2
the movable blade is resiliently biased against the stationary blade
Data Source
AI summary
A hair clipping device, including, a housing; a cutting assembly including a stationary blade and a moveable blade resiliently biased against the stationary blade, the stationary blade and the moveable blade defining a cutting plane therebetween, an eccentric transmission element including an eccentric pin protruding therefrom and arranged on a rotary driven shaft, a motor for driving the eccentric transmission element; a coupling element coupled to the eccentric transmission element for translating a movement of the eccentric transmission element into oscillatory movement of the moveable blade relative to the stationary blade; the coupling element arranged inside of a common recess formed from a first recess cut into the movable blade and a second recess cut into the stationary blade that form the common recess; wherein the eccentric transmission element engages the coupling element at at least one engagement point in the same plane as the cutting plane.