Trimmer Mower Rotor With Differential Rotation Thread Feed
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Solution Overview
Problem
Existing string trimmer rotors require manual intervention to replace the working thread, necessitating interruption of the mowing process and additional work to pull out the thread during operation.
Innovation Solution
A string trimmer rotor design featuring a receptacle and casing that rotate at different speeds, allowing continuous thread unwinding with a speed difference, and a cutting mechanism to manage thread length, ensuring uninterrupted operation and efficient thread management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the working thread is manually replaced in existing rotors, then the rotor structure remains simple, but the mowing process must be interrupted and additional manual work is required
Solution Approach 1:
The rotor automatically feeds the working thread during operation through differential rotation between the receptacle and casing, eliminating the need for manual thread replacement and continuous mowing interruption. The system serves itself by continuously unwinding and feeding thread as it is consumed.
Solution Approach 2:
The invention introduces dynamic differential rotation where the receptacle and casing rotate at different speeds during operation. The receptacle rotates faster than the casing in the opposite direction to the winding direction, creating continuous thread unwinding and automatic feeding without manual intervention.
2Extent of automation
If the thread is continuously unwound during operation, then manual intervention is reduced, but the rotor structure becomes more complex with additional driving mechanisms
Solution Approach 1:
The invention combines the thread unwinding function with the existing rotation drive system. The single drive simultaneously rotates both the receptacle and casing through gear connections, merging multiple functions into a unified mechanical system rather than adding separate unwinding mechanisms.
Solution Approach 2:
A gear mechanism acts as an intermediary between the single drive and the receptacle-casing system. The gear connections transmit and differentiate the rotational motion, enabling controlled differential rotation without requiring complex direct drive mechanisms for each component.
3Productivity
If the receptacle and casing rotate at different speeds, then continuous thread feed is achieved, but the driving mechanism requires precise speed control
Solution Approach 1:
The differential rotation creates a periodic thread unwinding action that matches the consumption rate. The gear mechanism establishes a fixed periodic relationship between receptacle and casing rotations, ensuring consistent thread feed timing and rate without requiring continuous variable speed control.
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
Enables continuous thread feed during operation, reducing manual intervention and maintaining efficient mowing performance by automatically unwinding and cutting the thread as needed, minimizing environmental pollution.
Implementation Method 1
a thread-carrying rotating shaft for a series of elastic threads that tend to align radially under the influence of centrifugal force
Data Source
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AI summary
The invention relates to a trimmer mower rotor (100), formed by a receptacle (105), on which at least one plastic thread (103) has been wound, wherein the receptacle is received in a rotatable manner in a housing (101) and the receptacle (105) and the housing are rotatable about a single axis, wherein the housing (101) has at least one opening through which a thread portion (103) is guided to the outside. According to the invention, the receptacle (105) and at least one part that forms the housing having the opening rotate at different speeds.