Hair Clipper Blade Torque Reduction via Eccentric Coupling
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Solution Overview
Problem
Conventional hair clipping devices experience an unwanted 'pulling effect' due to overturning torque, leading to inefficient cutting and user discomfort, often addressed by using large and expensive motors or increased blade friction.
Innovation Solution
A hair clipping device design with a coupling element that engages the eccentric transmission element within the cutting plane, reducing overturning torque and incorporating ball bearings for reduced friction, allowing for efficient cutting performance with regular motors and springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large electric motor is used to overcome the pulling effect, then the cutting performance is improved, but the device size and production cost increase
Solution Approach 1:
The patent repositions the driving bridge from a conventional upper surface mounting to a lower surface mounting, effectively changing the spatial dimension of the force transmission path. This dimensional shift moves the engagement point closer to the cutting plane, reducing the perpendicular distance and eliminating the overturning torque that causes the pulling effect, thereby allowing smaller motors to achieve reliable cutting performance
2Reliability
If a large electric motor is used to overcome the pulling effect, then the cutting performance is improved, but the production cost increases
Solution Approach 1:
By inverting the mounting position of the driving bridge to the lower surface of the movable blade, the patent eliminates the need for oversized motors. This dimensional repositioning reduces the perpendicular distance between the engagement point and the cutting plane, minimizing overturning torque and allowing the use of smaller, less expensive motors while maintaining reliable cutting performance
3Device complexity
If the electric motor driven eccentric engages above the movable cutting blade, then the blade structure is simplified, but the pulling effect occurs during heavy load cutting
Solution Approach 1:
The patent inverts the conventional arrangement by mounting the driving bridge on the lower surface of the movable blade instead of the upper surface. This dimensional inversion repositions the eccentric engagement point to engage below the cutting plane, reducing the perpendicular distance and eliminating the overturning torque that causes the pulling effect during heavy load cutting
Solution Approach 2:
The driving bridge serves as an intermediary element that mediates between the eccentric and the movable blade. By repositioning this intermediary to engage below the cutting plane, the patent creates a more favorable force transmission path that eliminates the harmful pulling effect while maintaining structural simplicity
4Reliability
If strong springs are used to press the blades against each other to prevent lifting, then the cutting performance is improved, but the friction between blades increases
Solution Approach 1:
The patent fundamentally changes the force transmission geometry by mounting the driving bridge on the lower surface of the movable blade. This dimensional repositioning aligns the engagement point closer to the cutting plane, reducing the perpendicular distance and eliminating the overturning torque. As a result, the pulling effect is minimized, and normal spring pressure is sufficient to maintain blade contact without requiring excessively strong springs that would increase 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, improving cutting performance, reducing wear and tear, and enhancing 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
a motor for driving an eccentric transmission element; and a coupling element coupled to said eccentric transmission element for translating a movement of said eccentric transmission element into an oscillatory movement of the moveable blade
Implementation Method 2
said eccentric transmission element engages the coupling element at at least one engagement point, wherein said at least one engagement point is in at least one operating position during the movement of said eccentric transmission element within said cutting plane
Implementation Method 3
incorporating ball bearings for reduced friction
Implementation Method 4
a moveable blade that is resiliently biased against the stationary blade
Data Source
AI summary
The present invention relates to a hair clipping device, comprising: a housing; a cutting assembly (12) which is arranged on one end of said housing and comprises a stationary blade (14) and a moveable blade (16) that is resilient ly biased against the stationary blade (14), wherein the stationary blade (14) and the moveable blade (16) define a cutting plane (30) between each other, wherein the stationary blade (14) comprises a first recess (34) and the moveable blade (16) comprises a second recess (32), wherein the first and the second recess (34, 32) are arranged on top of each other; a motor (18) for driving an eccentric transmission element (26); and a coupling element (28) coupled to said eccentric transmission element (26) for translating a movement of said eccentric transmission element (26) into an oscillatory movement of the moveable blade (16) relative to the stationary blade (14); wherein said eccentric transmission element (26) engages the coupling element (28) at at least one engagement point (38'), wherein said at least one engagement point (38) is in at least one operating position during the movement of said eccentric transmission element (26) within said cutting plane (30), and wherein the coupling element (28) is arranged in said first and second recess (34, 32).