Electric Knife Balancing Weight Vibration Reduction
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Solution Overview
Problem
Existing electric knives used for cutting thick cardboard experience vibrations in the knife body and lack sufficient rigidity in the fixed axis guidance.
Innovation Solution
The electric knife incorporates a blade holder that pivots around an axis perpendicular to the blade, with a movement transformation device using a rod connected to the motor's output shaft to create a reciprocating motion. This setup includes a balancing weight on a disc and a sleeve received in an internal bearing cage to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rod connected to the motor shaft oscillates the blade holder to cut thick cardboard, then cutting capability is improved, but vibrations in the knife body increase
Solution Approach 1:
A balancing weight is produced on a sector of the disc in a position diametrically opposite the rod relative to the motor shaft. This counterweight compensates for the unbalanced forces generated by the eccentric rod during oscillation, thereby reducing vibrations in the knife body while maintaining the blade holder's oscillating motion for cutting thick cardboard
Solution Approach 2:
The vibrations generated by the oscillating mechanism are converted into a beneficial counterbalancing force through the addition of the balancing weight. The harmful vibration forces are transformed into a balanced system where the counterweight's gravitational and inertial forces offset the rod's unbalanced forces, reducing overall vibrations
2Stability of the object's composition
If the fixed axis guidance is made more rigid to reduce vibrations, then stability is improved, but device complexity increases
Solution Approach 1:
Instead of increasing the rigidity and complexity of the fixed axis guidance structure, the patent employs a balancing weight on the disc that counteracts vibrational forces. This dynamic balancing approach achieves stability without requiring a more complex rigid guidance structure, thereby resolving the contradiction between stability and device complexity
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 reduces vibrations and enhances the rigidity of the knife body, ensuring smoother and more precise cutting operations while providing a safety mechanism to prevent accidental operation.
Implementation Method 1
a balancing weight is produced on a sector of said disc in a position diametrically opposite the rod relative to said motor shaft
Implementation Method 2
a rod connected to an output shaft of the motor, eccentric relative to and parallel to the output shaft
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
Electric knife, comprising a knife body (1), forming a handle housing an electric motor (2), and a blade holder (3), received in the handle, carrying a blade (4) and operated by the motor through a device (5) for transforming rotary movement of the motor into reciprocating movement of the blade holder, for which the knife comprises an axis (6) perpendicular to the blade, around which the blade holder (3) pivots, for which the blade holder (3) comprises a rear end (3a) on the handle side provided with transverse stops (31a, 31b) and a front end (3b) from which the blade protrudes, the movement transformation device (5) comprising a rod (8) connected to an output shaft (9) of the motor, eccentric relative to and parallel to the output shaft, and for which the rod (8) set in motion by the output shaft acts alternately on the transverse stops (31a,31b) of the blade holder for maneuvering the rear end of the blade holder back and forth in a direction perpendicular to the edge of the blade and in the plane of the blade, said rod (8) acting on the transverse stops (31a, 31b) of the blade holder by means of a bearing (10) centered on the rod and whose external cage (10a) is positioned between said transverse stops (31a, 31b), characterized in that the rod (8) being constituted by a tenon mounted eccentrically on a disc (11) fixed axially on the motor shaft (9) and centered on the motor shaft, a balancing weight (111) is produced on a sector of said disc in a position diametrically opposite the rod (8) relative to said motor shaft (9).,