Grass Trimmer Automatic Winding Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional grass trimmers require manual winding of the trimmer line, which is cumbersome and slow, and automatic winding modes often have complex switching and locking mechanisms, making them difficult for users to operate effectively.
Innovation Solution
A grass trimmer with a motor-driven spool and head housing that enables automatic winding, featuring a user-operable operating assembly with a locking mechanism and winding switch, allowing for easy activation and control of the automatic winding mode, and a linkage between the locking mechanism and winding switch for reliable and simple operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual winding is used, then the structure is simple, but the winding speed is low and operation is troublesome
Solution Approach 1:
The motor automatically winds the trimmer line onto the spool without requiring manual intervention, making the system serve itself. The motor that already exists for driving the trimmer head is repurposed to perform the winding function, eliminating the need for separate winding mechanisms while improving productivity.
Solution Approach 2:
The motor serves dual functions: driving the trimmer head rotation for cutting and winding the trimmer line onto the spool. By making the motor multi-functional, the patent avoids adding separate winding mechanisms, thus improving winding speed without significantly increasing device complexity.
2Productivity
If automatic winding mode is added, then winding speed improves, but the switching and locking mechanisms become complicated
Solution Approach 1:
The switching mechanism and locking mechanism are merged into a single integrated assembly. When the user operates the switch, it simultaneously controls the motor to wind the line and activates the locking mechanism to secure the spool, eliminating the need for separate switching and locking operations and simplifying user interaction.
Solution Approach 2:
The operating assembly acts as an intermediary that coordinates multiple functions through a single user action. It translates the user's simple switch operation into coordinated motor activation and locking mechanism engagement, making the complex automatic winding process easy to operate.
3Reliability
If complex locking mechanism is used, then winding reliability improves, but operation convenience deteriorates
Solution Approach 1:
The locking mechanism automatically engages when the user operates the switching assembly, without requiring separate manual locking actions. The system self-locks during the winding process, ensuring reliability while maintaining operational simplicity.
Solution Approach 2:
The locking function is merged with the switching operation, so that a single user action simultaneously initiates winding and secures the spool. This integration ensures reliable locking without adding operational steps, resolving the contradiction between reliability and ease of operation.
Data Source
AI summary
A grass trimmer includes a trimmer head, a driving device, and an operating device. The trimmer head includes a spool and a head housing. The driving device includes a motor. The grass trimmer has an automatic winding mode in which the motor drives the spool or the head housing to cause the spool and the head housing to rotate relatively so as to wind the trimmer line onto the spool. The grass trimmer further includes a winding switch for controlling the automatic winding mode to be enabled, an operating assembly for controlling the winding switch to be opened, and a locking mechanism. When the operating assembly is operated, the locking mechanism is able to lock the head housing or the spool and the winding switch is triggered so as to cause the head housing and the spool to rotate relatively.