Bidirectional Driving Mechanism for Electric Scissors Blades
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Solution Overview
Problem
Existing electric scissors with traditional bidirectional drive mechanisms face issues such as complex structure, difficulty in assembly and disassembly, and reduced service life due to blade thickness and meshing problems when cutting thicker vines and branches.
Innovation Solution
A bidirectional driving mechanism for electric scissors blades is introduced, featuring a rotating shaft member with a stop screw and nut, and a gear system where the driving gear and rotating shaft member are arranged on a fixed seat, allowing the upper and lower blades to rotate in the same plane, reducing thickness and preventing blade opening during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional bidirectional drive mechanism with bevel gears and driving gear is used, then the blades can be driven to shear, but the structure becomes complex and difficult to assemble and disassemble
Solution Approach 1:
The patent combines the driving gear and rotating shaft member into a single integrated assembly mounted on the fixed seat. The driving gear directly engages with the rack on the blade, eliminating the need for separate bevel gears and intermediate transmission components. This merging of functions reduces the number of parts while maintaining the blade shearing capability.
Solution Approach 2:
The driving gear serves multiple functions: it transmits rotational motion from the motor, provides structural support for the rotating shaft member, and directly engages with the rack to drive blade movement. This multi-functionality reduces the need for separate specialized components, simplifying the overall structure.
2Reliability
If the rear part of the blade has large thickness to ensure meshing of driving gear with rack, then the meshing is improved, but the blade cannot shear intricate vines and branches accurately
Solution Approach 1:
The patent relocates the driving gear and rack engagement from the traditional position between blades to the rear part of the blade assembly, utilizing the depth dimension of the housing. This allows the blade thickness to be reduced for better shearing precision while the driving gear engages with the rack at the rear, maintaining reliable meshing without interfering with the blade cutting edge.
3Adaptability or versatility
If the rear parts of the two blades swing to maximum extent, then the cutting range is increased, but the meshing degree between driving gear and teeth is affected causing blades to open outwards
Solution Approach 1:
The rotating shaft member acts as an intermediary between the driving gear and the blade rack. It provides a stable mounting point and ensures proper alignment of the gear teeth engagement throughout the full range of blade motion. This intermediary structure maintains consistent meshing degree even when blades swing to maximum extent, preventing the blades from opening outwards.
Data Source
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AI summary
The present disclosure relates to the technical field of electric scissors, and in particular relates to a bidirectional driving mechanism for electric scissors blades and an electric scissors. The bidirectional driving mechanism for electric scissors blade includes a fixed seat, a driving gear, a rotating shaft member, an upper blade group and a lower blade. The driving gear and the rotating shaft member are arranged on the fixed seat, the lower blade and the upper blade group rotate around the rotating shaft member, an outer rack is arranged at a rear part of the lower blade, a front part of the upper blade group is an upper blade, a rear part of the upper blade group is a meshing block, and an inner rack is arranged at a rear part of the meshing block; and the inner rack and the outer rack are respectively meshed with both sides of the driving gear. When driving, the driving gear, the upper blade and the lower blade all rotate in a circumferential direction in the same plane, and the situation that the upper blade and the lower blade open outwards since the circumferential rotation of the gear and the circumferential rotation of the upper blade and the lower blade are perpendicular to each other is avoided, thereby improving the stability of the bidirectional driving mechanism of electric scissors blades, and making the bidirectional driving mechanism of electric scissors blades more durable.