Electric Scissors Blade Mechanism Automatic Grinding

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Solution Overview

Problem

Electric scissors blades experience low durability due to wear and tear, leading to blunting and reduced effectiveness in cutting objects like tree branches without adhering to the blades.

Innovation Solution

A blade mechanism with a rotating shaft assembly that allows the moving blade to frictionally rotate relative to the setting blade, enabling automatic grinding of the cutting edge, and includes features like an oil storage piece for lubrication and adjustable nut for optimizing blade tension.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the moving blade and setting blade are kept in close contact during cutting, then cutting performance is improved, but blade wear increases and durability decreases

Engineering Contradiction:

Improvecutting performanceVSAvoidblade durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by automatically grinding the moving blade's cutting edge against the setting blade during each cutting cycle. This pre-sharpening action occurs before the blade becomes sufficiently dull to affect cutting performance, thereby maintaining blade sharpness and durability without requiring separate maintenance operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The blade mechanism implements self-service through the automatic grinding function where the moving blade frictionally rotates relative to the setting blade during cutting operations. This self-grinding mechanism allows the blade to maintain its own sharpness without external intervention, resolving the contradiction between continuous use and blade durability.

Inventive Principle:

Principle #25Self-service

2Reliability

If manual blade grinding is performed regularly, then blade sharpness is maintained, but user time and effort increase

Engineering Contradiction:

Improveblade sharpnessVSAvoidmaintenance time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The blade mechanism eliminates manual maintenance by implementing self-grinding through frictional rotation between the moving blade and setting blade. The blade automatically maintains its own sharpness during normal cutting operations, completely removing the need for user intervention in blade maintenance and eliminating the associated time loss.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent converts the harmful friction and wear that normally occur during cutting into a beneficial grinding action. The frictional rotation between blades, which would typically cause wear, is instead utilized to continuously sharpen the moving blade, transforming a detrimental effect into a useful maintenance function.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If the moving blade rotates frictionally relative to the setting blade, then automatic grinding occurs and durability improves, but blade tension control becomes more complex

Engineering Contradiction:

Improveblade durabilityVSAvoidblade mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the cutting function and grinding function into a single integrated blade mechanism. The frictional rotation between the moving blade and setting blade simultaneously achieves both cutting and automatic sharpening, eliminating the need for separate grinding mechanisms and reducing overall system complexity despite the added durability function.

Inventive Principle:

Principle #5Merging (Combining)

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 automatic grinding mechanism significantly enhances the durability of the moving blade's cutting edge, reducing the need for daily maintenance and improving cutting performance.

Implementation Method 1

the moving blade frictionally rotates relative to the setting blade, enabling automatic grinding of the cutting edge

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

an oil storage piece for lubrication

Methodology Applied

Scientific EffectLubrication: Lubrication

Data Source

PatentUS11534930B2Blade mechanism and electric scissors having blade mechanism

Publication Date: 2022.12.27 YONGKANG WEIDE IND & TRADE CO LTD

AI summary

The present application discloses a blade mechanism and an electric scissors having the blade mechanism. The blade mechanism includes a setting blade, a moving blade, and a rotating shaft assembly. The rotating shaft assembly respectively passes through the setting blade and the moving blade to allow the setting blade and the moving blade being rotatablely connected. The cutting edge of the moving blade is automatically ground when the moving blade frictionally rotates relative to the setting blade. According to the present application, the moving blade and the setting blade of the blade mechanism open or close to generate friction, allowing the cutting edge of the moving blade to be automatically ground by the setting blade, thus the durability of the moving blade is improved.