Electric Pruning Shears With Finger-Mounted Magnetic Switch
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Solution Overview
Problem
Conventional electric pruning shears face issues with hand fatigue due to low operating speed, inability to cut large branches without motor overload, and increased weight and volume from safety features, which can lead to motor damage.
Innovation Solution
The introduction of a portable operating switch with a magnet that separates from the main body and allows for reverse motor rotation in case of abnormality, reducing the need for a conventional safety switch and preventing motor damage by controlling the motor's direction during overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety switch is added to ensure safety during handling, then safety is improved, but volume and weight of the electric pruning shears are increased
Solution Approach 1:
The safety switch is separated from the main body and placed on the user's finger as an independent component. This segmentation allows the safety function to be added without increasing the weight and volume of the pruning shears themselves, as the switch is now part of the user interface rather than the tool structure.
Solution Approach 2:
A magnetic field is introduced as an intermediary between the portable operating switch and the contact switch. The magnetic field enables wireless actuation of the switch, eliminating the need for physical contact mechanisms that would add weight and complexity to the main body of the pruning shears.
2Force
If the motor operates at full load to cut large branches, then cutting capability is improved, but the motor may be overloaded and damaged
Solution Approach 1:
The system continuously monitors the operating current of the motor and provides feedback to the controller. When the current exceeds the predetermined threshold indicating overload, the controller automatically reverses the motor rotation to release the load, preventing motor damage while maintaining the ability to cut large branches.
3Productivity
If the movable blade moves repeatedly without condition, then pruning operation is maintained, but hand fatigue increases due to continuous operation
Solution Approach 1:
The motor operates in periodic cycles rather than continuously. The controller activates the motor only when needed for cutting operations, with intervals of inactivity in between. This periodic operation reduces the overall runtime and eliminates hand fatigue associated with continuous operation, while maintaining effective pruning productivity.
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 solution enhances operating speed, reduces hand fatigue, minimizes device weight and volume, and prevents motor damage by automatically reversing the motor during overload, ensuring safer and more efficient pruning operations.
Implementation Method 1
a portable operating switch having a ring shape capable of being put on a user's finger and including a magnet to operate the motor by connecting the movable contact and the fixed contact of the contact switch by a magnetic force of the magnet
Data Source
AI summary
The present invention provides electric pruning shears which can improve operation convenience by increasing the operating speed and eliminating hand fatigue during pruning of fruit trees.For this purpose, the present invention provides electric pruning shears which can improve safety during handling by implementing a new type of switching means having a separate safety switch capable of being separated from a main body and put on a user's finger and reduce the volume and weight by reducing the number of parts associated with the safety switch. Moreover, the present invention provides electric pruning shears which control a motor to be reversely rotated when there is an abnormality in blades of the electric pruning shears during a pruning operation, thus escaping from the overall abnormality including motor damage.