Motor-Controlled Fastening Tool for Precise Bit Stroke Adjustment
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Solution Overview
Problem
Existing fastening tools using combustion pressure or compressed air struggle with adjusting the striking depth of a driver bit due to mechanical limitations, leading to instability and reduced operability, with a narrow adjustable range and increased weight, and are hindered by external factors like temperature.
Innovation Solution
A fastening tool with a bit holding unit, a first drive unit for rotating the driver bit, and a second drive unit for moving it along the axis direction, controlled by a motor, allowing precise electrical control of the driver bit's movement, eliminating the need for mechanical adjustments near the nose unit and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical adjusting mechanism is used to control the driver bit movement, then the striking depth can be adjusted, but the number of components increases and the weight increases
Solution Approach 1:
The patent replaces the mechanical adjusting mechanism with an electrical control system. A motor (second drive unit) is used to drive the driver bit along the axis direction, and the movement amount is controlled electrically through a control unit that receives input from an operation unit. This substitution eliminates the need for complex mechanical adjustment mechanisms, reducing the number of components and overall weight while expanding the adjustable range.
2Adaptability or versatility
If a mechanical adjusting mechanism is arranged near the nose unit, then the striking depth can be adjusted, but the tip end-side of the tool becomes large
Solution Approach 1:
By replacing the mechanical adjusting mechanism with an electrical control system, the patent eliminates the need for physical adjustment mechanisms near the nose unit. The control unit and operation unit can be positioned elsewhere in the tool body, allowing the tip end-side to remain compact while retaining full adjustment capability.
3Adaptability or versatility
If an elastic member such as rubber is used to restrict the advance position of the piston, then the piston movement can be limited, but the striking depth is not stabilized due to external factors such as environmental temperature
Solution Approach 1:
The patent replaces the elastic member-based mechanical restriction with an electrical control system. The motor-driven approach allows precise control of the driver bit's advance position through electrical signals, eliminating the temperature sensitivity and instability associated with elastic members like rubber. The control unit can accurately position the driver bit regardless of environmental conditions.
4Adaptability or versatility
If a mechanical adjusting mechanism is used, then the striking depth can be adjusted, but the adjusting accuracy cannot be increased
Solution Approach 1:
The electrical control system provides superior adjusting accuracy compared to mechanical mechanisms. The control unit can precisely control the motor's rotation and the driver bit's movement in small increments, enabling fine-tuned adjustment of the striking depth. This electrical control approach allows for higher precision than what is achievable with mechanical linkages and adjustment mechanisms.
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 provides stable and precise control over the driver bit's movement, enhancing adjustability and operability, reducing the tool's weight and susceptibility to environmental factors, while simplifying the design and improving workability.
Implementation Method 1
a second drive unit having a second motor configured to move the driver bit along the axis direction
Implementation Method 2
a first drive unit having a first motor configured to rotate the driver bit held on the holding member by the bit holding unit
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A fastening tool (1) includes: a bit holding unit (3) having a holding member (30) configured to hold a driver bit (2) so as to be rotatable and to be movable in an axis direction; a first drive unit (4) having a first motor (40) configured to rotate the driver bit (2) held on the holding member (30) by the bit holding unit (3); a second drive unit (5) having a second motor (50) configured to move the driver bit (2) along the axis direction; and a control unit (100) configured to control an amount of movement of the driver bit (2) along the axis direction by an amount of rotation of the second motor (50).