Staple Driving Passage Geometry to Prevent Driver Slip-Off
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Solution Overview
Problem
Compressed-air-driven tackers experience unstable driving postures of U-shaped staples, leading to slipping off and potential damage to the workpiece due to the reaction force generated during ejection.
Innovation Solution
The driving tool features a driving passage with a head-guide surface and leg-guide grooves that guide the U-shaped driving member into an inclined posture, aligning the driver's movement direction with the staple's orientation to prevent slipping off and ensure stable ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a U-shaped staple is driven in a compressed-air-driven tacker, then the driving force is sufficient, but the driving posture becomes unstable causing the driver to slip off the staple head
Solution Approach 1:
The driving passage is pre-configured with guide surfaces and grooves that establish the correct inclined posture of the staple before ejection. This preliminary positioning ensures the driver remains aligned with the staple head throughout the driving process, preventing slipping off while maintaining sufficient driving force.
Solution Approach 2:
The guide surfaces and leg-guide grooves act as intermediary elements between the driver and the staple. These intermediaries constrain and guide the staple's movement, ensuring stable posture during ejection while allowing the driver to exert sufficient driving force on the staple head.
2Speed
If the driver moves downward to eject the staple, then the ejection speed is high, but the reaction force causes the ejection port to deviate and the driver to hit the workpiece
Solution Approach 1:
The driving passage is designed with an asymmetric inclined configuration where the staple is ejected at an angle rather than vertically. The tip end of the staple is deviated toward the front end surface side, creating an asymmetric ejection path that redirects the reaction force away from the workpiece, preventing damage while maintaining high ejection speed.
Solution Approach 2:
The ejection direction is changed from a purely vertical downward motion to an inclined three-dimensional trajectory. By introducing a horizontal component to the ejection vector through the inclined driving passage, the reaction force is distributed in multiple dimensions, preventing concentrated impact on the workpiece.
3Ease of operation
If the staple is ejected vertically downward, then the driving operation is simple, but the slipping off posture occurs frequently
Solution Approach 1:
The inclined posture of the staple is predetermined by the geometry of the driving passage before the ejection action occurs. This preliminary configuration eliminates the need for complex real-time adjustments during operation, maintaining simplicity while ensuring reliable driver-staple alignment throughout the driving process.
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 ensures reliable and stable driving operations by maintaining the staple's posture, preventing slipping off and minimizing workpiece damage.
Implementation Method 1
a head-guide surface that is formed in the driving passage and that slidably guides the head of the driving member
Implementation Method 2
a pair of leg-guide grooves, each of which is recessed from the head-guide surface toward a side of the first end surface
Data Source
AI summary
A driving tool includes a head-guide surface and a pair of leg-guide grooves, both are formed in a driving passage extending in a driving direction. The head-guide surface slidably guides a head of a U-shaped driving member. Each of the pair of leg-guide grooves is recessed from the head-guide surface toward a side of a first end surface of a tool main body. Legs of the driving member enter the leg-guide grooves. The driving member is driven in an inclined posture in which the legs enter the leg-guide groove, thereby avoiding a slipping off posture in which a driver is deviated from the driving member owing to a reaction force occurred when the driving member is driven by the driver.