Electric Knife Link Mechanism Isolates Motor Shaft
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Solution Overview
Problem
Existing electric cutting tools often suffer from structural instability and damage due to direct connection between the cutter blade and driving devices, leading to deformation or damage of the output end when under pressure.
Innovation Solution
The electric knife features a handle with a drive unit and a driven unit connected via a link, allowing the drive unit to reciprocate the cutter blade along an axis, absorbing pressure and twisted forces without directly transmitting them to the motor's output shaft, utilizing a screw with rolling members and pivotally connected sleeves for movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutter blade is directly connected to the motor output shaft, then the cutting effect is enhanced, but the output shaft is prone to twisting and deformation when the cutter blade is pressed
Solution Approach 1:
The direct connection between the motor output shaft and cutter blade is segmented into two independent parts: the drive unit (motor with output shaft) and the driven unit (cutter blade assembly), connected through a link mechanism. This segmentation allows the cutter blade to be driven effectively while isolating the motor output shaft from direct mechanical stress and deformation risks.
Solution Approach 2:
A link mechanism serves as an intermediary between the motor output shaft and the cutter blade. The link transmits the driving force from the motor to the cutter blade while absorbing and isolating the compressed pressure and twisted forces generated during cutting, preventing these forces from being directly transmitted to the motor output shaft.
2Power
If the drive unit and driven unit are connected through a link, then the driving force is effectively transmitted to the cutter blade, but the structure becomes more complex
Solution Approach 1:
The link mechanism employs a dynamic connection between the drive unit and driven unit, allowing the cutter blade to reciprocate along an axis while the link absorbs variations in force and movement. This dynamic approach enables effective power transmission while maintaining structural flexibility and reducing the need for overly complex rigid connections.
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 enhances structural stability, prevents damage to the driving device, and simplifies maintenance by isolating the drive and driven units, ensuring the cutter blade's operation without compromising the motor's integrity.
Implementation Method 1
the drive unit comprises a screw with two threads in opposite directions
Implementation Method 2
The two rolling members can scroll along the corresponding threads
Implementation Method 3
the drive unit further comprises two rolling members, which are respectively set on one side of the two threads of the screw. The two rolling members can scroll along the corresponding threads
Implementation Method 4
the drive unit and the driven unit are connected through a link, so that the drive unit can drive the cutter blade of the driven unit to reciprocate along an axis
Implementation Method 5
when the cutter blade on the driven unit is under pressure, the compressed pressure or twisted force can be absorbed by the link
Data Source
AI summary
An electric knife includes a cutter blade, a handle, and a drive unit and a driven unit mounted inside the handle. The drive unit includes a first movable sleeve. The driven unit includes a second movable sleeve. The cutter blade is set on the second movable sleeve. The drive unit and the driven unit are connected through a link, so that the drive unit can drive the second movable sleeve of the driven unit and the cutter blade to reciprocate along an axis.