Screw Driving Machine Depth Switching Mechanism
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Solution Overview
Problem
Screw driving machines face challenges in accurately driving screws into thick lower materials, leading to potential over-driving, weakened fastening force, and reduced workability due to excessive hole boring, and may fail to drive screws into thicker materials, resulting in incomplete tightening.
Innovation Solution
A screw driving machine with a contact portion that moves from a first to a second position to press against the driven member, a driving portion to move the driver bit axially, a tightening portion to rotate the driver bit, and a depth switching mechanism to adjust the driving and tightening depths based on the material thickness, allowing for selection of driving depth according to the driven member's material and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driving depth of the screw is reduced by the slide member engagement mechanism, then the screw can be tightened to a position where the head portion is flush with the upper material, but the workability is degraded when the lower material is thick because the screw cannot be driven into the lower material
Solution Approach 1:
The patent applies the dynamics principle by making the driving depth regulation mechanism switchable. The driving depth regulating portion can be switched between a regulated state (where the slide member engagement limits driving depth) and a non-regulated state (where full driving depth is allowed). This dynamic switching capability allows the system to adapt to different material thicknesses while maintaining precision control when needed, directly resolving the contradiction between driving depth precision and adaptability to different material thicknesses.
2Manufacturing precision
If the slide member engagement unit is used to reduce driving depth, then over-driving is prevented, but the screw driving machine stops and moves back, degrading workability
Solution Approach 1:
The system dynamically switches between regulated and non-regulated driving depth modes. When the switching portion is in the non-regulated position, the driving depth regulating portion does not constrain the contact portion, eliminating the stop-and-reverse motion and improving workability. When precision control is needed, the system switches to the regulated position. This dynamic approach resolves the contradiction between driving depth control and workability.
Solution Approach 2:
The patent extracts the driving depth regulation function from being always active to being selectively active. By providing a switching mechanism that can disengage the driving depth regulating portion, the harmful effect of unnecessary stopping and reversing is removed while retaining the beneficial depth control function when actually needed, thus resolving the contradiction between precision control and productivity.
3Adaptability or versatility
If the contact portion moves through the full range from first to second position, then the screw can be driven into thick materials, but the screw may be excessively driven into thin materials causing weakened fastening force
Solution Approach 1:
The switching portion enables dynamic adjustment of the contact portion's movement range. When switched to the regulated position, the contact portion is constrained to move only from the first to the third position, preventing excessive driving into thin materials and ensuring reliable fastening. When switched to the non-regulated position, the contact portion can move to the second position, enabling penetration into thick materials. This dynamic switching resolves the contradiction between adaptability to different material thicknesses and reliability of fastening force.
Data Source
AI summary
A screw driving machine includes a contact portion movable from a first position to a second position via a third position by abutting against a driven member to press against the driven member, a driving portion moving a driver bit when the contact portion reaches the third position to drive a screw into the driven member, a tightening portion causing the driver bit to rotate about an axis and tighten the screw after the screw is driven, a tightening depth switching portion switching a tightening depth of the screw by the tightening portion after the screw is driven, a driving depth regulating portion regulating a movement amount of the contact portion between the second position and the third position, and a driving depth switching portion switching whether to regulate the movement amount of the contact portion by the driving depth regulating portion.