Trimmer Head Spool Counter for Remaining Line Length
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Solution Overview
Problem
Existing thread mowing heads lack an accurate and universal method to determine remaining thread length, requiring users to rely on thread type and frequent adjustments, which can disrupt operations if not anticipated.
Innovation Solution
A thread mowing head with a counting device that tracks thread length by counting up when wound and down when unwound, using mechanical, electronic, or electromechanical counters, and displaying the remaining length to the operator, allowing for precise determination regardless of thread design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a line length counter is used to determine remaining line length, then the operator can anticipate cutting line changes, but the device complexity increases
Solution Approach 1:
The patent replaces complex electronic or electromechanical counting devices with a simple mechanical counter system. The counter is directly actuated by the spool's rotation through a toothed element, eliminating the need for sensors, processors, and power sources while still providing accurate remaining line length indication.
Solution Approach 2:
The counting device is designed to be self-actuating through the spool's own rotation. The toothed element on the spool directly engages the counter mechanism, allowing the system to automatically track remaining line length without external intervention, power sources, or complex control systems.
2Adaptability or versatility
If colored sections on cutting line are used to indicate remaining length, then the solution is simple, but it is only possible depending on the cutting line type
Solution Approach 1:
The patent creates a universal remaining line length indication system that works with all cutting line types. Instead of relying on cutting line-specific features like colored sections, the system uses a mechanical counter that responds to spool rotation regardless of what line is attached, making it compatible with monofilament, multifilament, and various line configurations.
Solution Approach 2:
The patent introduces a mechanical counter as an intermediary between the spool rotation and the remaining line length indication. This mediator translates spool rotational position into a readable count value, providing precise measurement independent of cutting line characteristics.
3Reliability
If frequent cutting line adjustments are made to ensure sufficient line length, then cutting function is maintained, but productivity decreases
Solution Approach 1:
The patent implements a feedback mechanism through the mechanical counter that continuously displays remaining line length to the operator. This real-time information allows the operator to monitor line consumption and plan line replacements proactively, maintaining cutting function reliability while minimizing interruptions to productivity.
Solution Approach 2:
The patent enables preliminary action by allowing the operator to see remaining line length in advance and prepare spare cutting line before it is completely used up. This proactive approach ensures cutting function is maintained without unexpected interruptions, as line changes can be planned and executed at convenient times rather than during critical operations.
Data Source
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AI summary
The invention relates to a trimmer head for mounting on a drive shaft (3) of a brushcutter (1). The trimmer head (2) comprises a housing (4) and a spool (5) for winding and unwinding a cutting line (6). The spool (5) is rotatably mounted relative to the housing (4) about a pivot axis (7). The spool (5) has a first direction of rotation (8) and a second direction of rotation (9) opposite to the first direction of rotation (8) relative to the housing (4). The trimmer head includes a counter for measuring the remaining line length. The counter (10) is operatively connected to the spool (5) such that when the spool (5) rotates relative to the housing (4), the counter (10) counts up in the first direction of rotation (8) and counts down in the second direction of rotation (9).