Motor-Driven Fastening Tool for Adjustable Screw Striking Force
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Solution Overview
Problem
Existing screw striking machines require either a battery and gas cylinder or rely on spring compression, making it difficult to adjust screw striking force accurately.
Innovation Solution
A fastening tool with a bit holding unit that allows for rotational and axial movement of a driver bit, driven by two independent motors: one for rotation and another for axial movement, enabling precise screw engagement and force adjustment against a fastening target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spring compression mechanism is used to strike screws, then the tool can operate without a gas cylinder, but it becomes difficult to adjust screw striking force accurately
Solution Approach 1:
The patent applies parameter changes by using a motor-driven mechanism that can vary the axial movement distance and speed of the driver bit. The motor allows continuous adjustment of striking force parameters, enabling precise control over the force applied to screws during fastening operations, unlike fixed spring compression mechanisms.
Solution Approach 2:
The patent replaces the mechanical spring compression system with an electric motor-driven system. This substitution enables more precise and adjustable control over the striking force through electrical control, eliminating the limitations of mechanical spring-based force delivery while maintaining portability.
2Power
If a gas cylinder and battery are used to power the striking machine, then sufficient power can be provided, but the device complexity and weight increase
Solution Approach 1:
The patent extracts and eliminates the gas cylinder component from the traditional striking machine system. By using only a battery-powered motor to provide both rotational and axial movement, the design removes the complexity of dual-power systems while maintaining sufficient striking power through optimized motor control and single-point drive mechanics.
Solution Approach 2:
The patent applies universality by using a single battery-powered motor system that performs multiple functions: providing rotational movement for screw engagement and axial movement for striking force. This multi-functional approach eliminates the need for separate gas cylinder and battery systems, reducing overall device complexity while maintaining power requirements.
3Power
If a gas cylinder is used to provide striking force, then high power can be achieved, but the tool weight and portability are compromised
Solution Approach 1:
The patent replaces the heavy gas cylinder mechanical system with a lighter battery-powered electric motor system. The motor provides sufficient striking force through controlled axial movement of the driver bit, eliminating the need for bulky gas storage and pressure regulation components, thereby significantly reducing tool weight while maintaining portability.
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 configuration allows for precise control of screw striking force, simplifies the tool design, reduces weight, and improves workability by eliminating the need for a gas cylinder and enhancing force adjustment capabilities.
Implementation Method 1
a first drive unit having a first motor configured to rotate the driver bit held by the bit holding unit
Implementation Method 2
a second drive unit having a second motor configured to move the driver bit held by the bit holding unit along the axis direction
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A fastening tool (1) comprising: a bit holding unit (3) configured to hold a driver bit (2) so as to be rotatable and to be movable in an axis direction; and a motor (50) configured to move the driver bit (2) held by the bit holding unit (3) along the axis direction in which a screw (200) engaged with the driver bit (2) is pressed against a fastening target.