Screw Fastening Tool Switch Lever Visual Feedback
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Solution Overview
Problem
Users of screw fastening tools struggle to intuitively comprehend the amount of switch lever operation, leading to unnecessary force application and fatigue, as the rotational speed adjustment is not visibly indicated during lever operation.
Innovation Solution
Incorporating an operation amount detection means, such as a force sensor, and an operation amount indicating means, like light-emitting diodes, to visually and intuitively convey the switch lever pulling amount and corresponding rotational speed levels, allowing users to understand the speed change through a visible feedback system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a force sensor is used to detect the pressing force of the switch lever, then the pulling amount of the switch lever can be minimized, but it becomes difficult for the user to comprehend the amount by which the lever has been pulled
Solution Approach 1:
The patent applies feedback by providing visual indication (such as LED lights or display elements) that show the operation amount of the switch lever to the user. This feedback loop allows the user to comprehend how much the lever has been pulled, even when the physical pulling distance is minimized through force sensor detection. The visual feedback compensates for the reduced tactile feedback, resolving the contradiction between ease of operation and information comprehension.
Solution Approach 2:
The patent introduces an intermediary visual indication system that mediates between the force sensor detection and the user's comprehension. Instead of relying directly on the physical displacement of the lever for comprehension, the intermediary visual display translates the force sensor output into comprehensible visual information, allowing minimal lever movement while maintaining user awareness of operation amount.
2Measurement precision
If the rotational speed of the electric motor is adjusted according to the amount by which the switch lever is pulled, then speed control precision is improved, but the user cannot intuitively comprehend the rotational speed level without visual feedback
Solution Approach 1:
The patent implements visual feedback that displays the current rotational speed level corresponding to the switch lever operation amount. This feedback mechanism allows the user to intuitively comprehend the rotational speed level while the force sensor maintains precise speed control. The visual indication bridges the gap between precise electronic control and human intuitive understanding.
Solution Approach 2:
The patent may utilize color changes or light intensity variations as visual indicators of rotational speed levels. Different colors or brightness levels correspond to different speed ranges, providing intuitive visual feedback that matches the precise electronic speed control, allowing users to quickly comprehend the current operational state without complex displays.
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 enables users to comprehend the rotational speed level intuitively, reducing finger fatigue by minimizing the required pulling force and improving operability through visual feedback, allowing for more precise control and efficient operation of the screw fastening tool.
Implementation Method 1
the pressing force produced through the operation of the switch is detected, for example, by a force sensor (load sensor)
Implementation Method 2
an operation amount indicating means, like light-emitting diodes, to visually and intuitively convey the switch lever pulling amount
Data Source
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AI summary
In a rotary tool such as a screw fastening tool in which an operation switch is provided for starting, stopping or changing a speed through detection, by a force sensor, of a pressing force produced by a pulling operation of a switch lever, it is aimed to enable the user to intuitively comprehend the pulling operation amount of the switch lever by a relatively light pull. Based on an output signal from the force sensor as an operation amount detection means, the pulling operation amount of the switch lever is reported by the number of LEDs (31) that are lit up.