Grass Trimmer Auto-Winding Spool Control
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Solution Overview
Problem
Current grass trimmers require manual effort to wind cutting lines onto the spool, making the process inconvenient and slow.
Innovation Solution
A grass trimmer with an auto-winding mode, utilizing a motor to automatically wind the cutting line onto the spool, and a control method that includes operating elements to switch between cutting and auto-winding modes, along with a damping device to manage the rotation of the spool and line holding member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual winding of cutting line is used, then device complexity is reduced, but productivity decreases and ease of operation worsens
Solution Approach 1:
The motor serves dual functions: driving the trimming head rotation for cutting vegetation and driving the spool or line holding member rotation for automatic winding of cutting line. This multi-functionality enables automatic winding capability without adding a separate dedicated winding motor, thus improving productivity while controlling device complexity.
Solution Approach 2:
The system dynamically switches between cutting mode and auto-winding mode through control means. The motor's function changes from cutting to winding based on operational requirements, allowing the same mechanical components to serve different purposes at different times, thereby achieving automatic winding without permanent structural complexity.
2Loss of time
If manual winding is used, then ease of operation is maintained, but loss of time increases
Solution Approach 1:
The system performs self-service by automatically winding the cutting line onto the spool using the motor's rotation. The user simply needs to position the cutting line and activate the auto-winding mode, after which the system winds the line automatically without requiring continuous manual manipulation, significantly reducing winding time and improving operational convenience.
Solution Approach 2:
The manual mechanical winding operation is replaced by an automated motor-driven system. The control means activates the motor to rotate the spool or line holding member, substituting the user's manual rotational effort with automated mechanical action, thereby reducing both time and effort required for winding.
3Productivity
If auto-winding mode is implemented, then productivity increases, but device complexity increases
Solution Approach 1:
The motor and control system serve multiple functions: cutting operation control and automatic winding control. By using the existing motor and control infrastructure for both cutting and winding operations, the patent achieves automatic winding functionality without proportionally increasing device complexity, as the same components perform dual roles.
Solution Approach 2:
The system operates in periodic cycles between cutting mode and auto-winding mode. The control means switches between these modes based on operational needs, allowing the motor to alternately drive the trimming head for cutting and the spool for winding. This periodic action enables efficient winding without requiring continuous complex control, as the system returns to simple cutting operation after winding cycles.
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 auto-winding mode allows for efficient and convenient automatic winding of the cutting line, reducing user effort and increasing the speed of the process compared to manual winding.
Implementation Method 1
The motor drives at least one of the spool and the line holding member to make the spool and the line holding member rotate relatively so that the cutting line is wound on the spool automatically
Implementation Method 2
the damping device includes a damping element for applying a resistance force on the spool to stop the spool from rotating
Implementation Method 3
the damping device includes a damping element for applying a resistance force on the line holding member to damp the rotation of the line holding member
Data Source
AI summary
A grass trimmer includes a trimming head, a driving device for driving the trimming head to rotate so as to cut vegetation and an operating device for a user to operate so as to control the driving device. The trimming head includes a spool and a line holding member, the spool is used to wind a cutting line, and the line holding member is formed with a line holding structure. The driving device includes a motor. The grass trimmer has an auto-winding mode. In the auto-winding mode, the motor drives at least one of the spool and the line holding member to make the spool and the line holding member rotate relatively so that the cutting line is wound on the spool automatically.