Electric Driving Tool Dynamic Wait Position Control

Solution Overview

Problem

Electric driving tools face issues with response time and safety due to the driver waiting at either bottom or top dead center positions, leading to potential errors in fastener alignment and inclination within the magazine, especially when the fastener quantity decreases, which requires increasing the guide margin, thereby enlarging the tool's size and weight.

Innovation Solution

The electric driving tool adjusts its driver wait position based on the residual fastener quantity, using a control unit with detecting portions to switch between wait positions, ensuring the driver waits at an intermediate position between top and bottom dead centers when fasteners are plentiful and near the bottom dead center when they are scarce, without increasing the guide margin, thus preventing fastener inclination and optimizing response performance and safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the driver waits at the top dead center position, then the response time is improved, but the driver may drive the fastener in error due to motor rotation errors

Engineering Contradiction:

Improveresponse timeVSAvoidfastener driving accuracy

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent applies local quality by differentiating the wait position based on the residual fastener quantity. When fasteners are abundant, the driver waits at the top dead center position for fast response. When fasteners are scarce, the driver waits at the bottom dead center position to prevent erroneous driving. This localized adaptation of wait position to specific operational conditions resolves the contradiction between response time and driving accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the driver's wait position variable rather than fixed. The control unit dynamically adjusts the wait position based on real-time detection of residual fastener quantity. This dynamic adjustment allows the system to optimize both response time and safety according to the current operational state, transforming a static design into an adaptive one.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the driver waits at the bottom dead center position, then the safety against erroneous driving is improved, but the response time deteriorates

Engineering Contradiction:

Improvefastener driving safetyVSAvoidresponse time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies local quality by differentiating the wait position based on the residual fastener quantity. When fasteners are abundant, the driver waits at the top dead center position for fast response. When fasteners are scarce, the driver waits at the bottom dead center position to prevent erroneous driving. This localized adaptation of wait position to specific operational conditions resolves the contradiction between response time and driving accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the driver's wait position variable rather than fixed. The control unit dynamically adjusts the wait position based on real-time detection of residual fastener quantity. This dynamic adjustment allows the system to optimize both response time and safety according to the current operational state, transforming a static design into an adaptive one.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the guide margin is increased to prevent fastener inclination, then the fastener handling safety is improved, but the tool's size and weight increase

Engineering Contradiction:

Improvefastener handling safetyVSAvoidtool weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent implements dynamics by making the driver's wait position variable rather than fixed. The control unit dynamically adjusts the wait position based on real-time detection of residual fastener quantity. This dynamic adjustment allows the system to optimize both response time and safety according to the current operational state, transforming a static design into an adaptive one.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies parameter changes by varying the driver's positional parameters (wait position) based on operational conditions. Instead of changing the physical guide margin, the system changes the driver's position parameter dynamically. This approach achieves safety without increasing the guide margin, thereby avoiding the penalty of increased size and weight.

Inventive Principle:

Principle #35Parameter changes

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 approach maintains response performance and safety without increasing the guide margin, preventing fastener inclination and reducing the tool's size and weight by dynamically adjusting the driver's wait position based on fastener quantity, ensuring efficient operation and safe fastener handling.

Implementation Method 1

a plunger normally energized downwardly by a spring

Methodology Applied

Scientific EffectSpring: Spring

Data Source

PatentEP2537640B1Electric driving tool

Publication Date: 2016.09.07 MAX CO LTD

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AI summary

In an electric driving tool of the invention, when moving a driver 21 having driven out a fastener upwardly from a bottom dead center position and making the driver 21 to stop at a wait position, a wait position when a decrease of a residual quantity of connected fasteners in the magazine 12 is detected is set to be lower than a wait position when the decrease of a residual quantity of connected fasteners in the magazine 12 is not detected.