Motor-Driven Screw Feeding in Fastening Tools for Compact Force
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Solution Overview
Problem
Existing screw striking machines face challenges in feeding screws with sufficient force and securing a predetermined stroke, especially when multiple screws are connected in a roll shape, often requiring large solenoids, leading to a bulky tool design.
Innovation Solution
A fastening tool equipped with a screw accommodating unit, a screw feeding unit, and a screw feeding motor, which includes an engaging part and a screw feeding transmission part to transmit the drive force, allowing for efficient screw feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large solenoid is used to feed the screw, then the screw feeding force is sufficient, but the tool size increases and becomes bulky
Solution Approach 1:
The patent replaces the electromagnetic solenoid system with a motor-driven mechanical transmission system. The motor (130) connects through a transmission mechanism (including gears 132, 134 and shafts) to the engaging part (120), providing sufficient feeding force through mechanical advantage while keeping the motor size manageable for handheld tool applications.
Solution Approach 2:
The patent divides the screw feeding function into separate components: the motor (130) as the power source, the transmission part (gears 132, 134) as the force amplification mechanism, and the engaging part (120) as the screw engagement component. This segmentation allows each component to be optimized independently, achieving sufficient force without requiring an oversized single component.
2Reliability
If an urging member with sufficient force is used to feed the screw, then the screw can be fed reliably, but the tool structure becomes more complex
Solution Approach 1:
The patent replaces the spring-based urging member system with a motor-driven transmission system. The motor (130) provides controlled, reliable feeding force through mechanical transmission (gears 132, 134) to the engaging part (120), achieving consistent screw feeding without the complexity of pre-compressed springs and their associated adjustment mechanisms.
Solution Approach 2:
The patent changes the feeding mechanism from passive elastic urging (spring force) to active controlled mechanical driving (motor torque). This parameter change allows for more reliable and consistent screw feeding force that can be controlled through the transmission ratio of the gear system, rather than relying on spring compression limits.
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 tool effectively feeds screws with a motor-driven force, reducing the need for large solenoids and maintaining a compact design, improving workability and weight balance, and enabling precise control over screw pressing force.
Implementation Method 1
a screw feeding transmission part configured to transmit a drive force of the screw feeding motor to the engaging part
Data Source
AI summary
A fastening tool includes: a screw accommodating unit configured to accommodate therein a screw; and a screw feeding unit configured to feed the screw accommodated in the screw accommodating unit to an ejection passage through which a driver bit is to pass. The screw feeding unit includes: a screw feeding motor, an engaging part configured to engage with the screw, and a screw feeding transmission part configured to transmit a drive force of the screw feeding motor to the engaging part.