Guide Bush Differential Threading for Fast Precise Diameter Adjustment
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Solution Overview
Problem
Existing guide bush apparatuses require complex and time-consuming adjustments due to small changes in inner diameter per rotation of the retraction sleeve, leading to potential interference with the spindle or tool and inconsistent engagement of screw threads.
Innovation Solution
A guide bush apparatus with a retraction sleeve featuring different thread pitches for the first and second screws, allowing for easy switching between large and small adjustments through a differential attachment/detachment body, and a mechanism to prevent rotation when necessary, facilitating quick and precise diameter adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a differential mechanism with a single screw thread pitch is used for adjustment, then fine adjustment precision is improved, but the number of rotations required to achieve the desired inner diameter increases significantly, making the adjustment process complicated and time-consuming
Solution Approach 1:
The patent applies a dual-thread-pitch differential mechanism that dynamically switches between two adjustment modes: a first screw with a larger pitch for rapid coarse adjustment, and a second screw with a smaller pitch for precise fine adjustment. This dynamic switching allows the operator to quickly reach the target inner diameter range while minimizing the number of rotations required, thereby resolving the contradiction between adjustment precision and adjustment time.
Solution Approach 2:
The adjustment mechanism is segmented into two distinct screw threads with different pitches: the first screw thread provides larger displacement per rotation for quick positioning, while the second screw thread provides smaller displacement per rotation for precise adjustment. This segmentation allows the system to handle both coarse and fine adjustment requirements efficiently, reducing overall adjustment time while maintaining precision.
2Manufacturing precision
If the retraction sleeve is rotated many times to achieve the desired inner diameter, then the guide bush can be adjusted to the correct size, but the retraction sleeve may project much further rearward than the guide bush sleeve, causing interference with the spindle or tool
Solution Approach 1:
The dual-thread-pitch mechanism allows dynamic selection of adjustment speed: the first screw with larger pitch enables rapid approach to the target dimension with minimal rotations, while the second screw with smaller pitch allows precise final adjustment. This dynamic control prevents excessive rotation and projection of the retraction sleeve, eliminating interference with the spindle or tool while achieving the desired manufacturing precision.
Solution Approach 2:
The first screw with larger pitch performs the preliminary coarse adjustment quickly, bringing the guide bush close to the target inner diameter with only a few rotations. This preliminary action minimizes the subsequent fine adjustment required, thereby preventing excessive retraction sleeve projection and avoiding interference with surrounding components.
3Adaptability or versatility
If the number of engaged screw threads changes according to guide bush position, then the mechanism adapts to different positions, but the adjusted relative positions of guide bush sleeve and retraction sleeve vary greatly, requiring repeated engagement release and re-adjustment
Solution Approach 1:
The patent implements a dynamic dual-thread system where the operator can switch between the first screw (larger pitch) and the second screw (smaller pitch) based on the current adjustment stage. This dynamic switching provides adaptability to different adjustment phases while maintaining operational simplicity, as the operator follows a clear two-stage process rather than dealing with variable engagement complexities.
Solution Approach 2:
The adjustment process is segmented into two distinct phases: coarse adjustment using the first screw thread, and fine adjustment using the second screw thread. This segmentation provides adaptability to different precision requirements while simplifying the operation, as each phase has a dedicated mechanism with predictable behavior, eliminating the need for repeated engagement release and re-adjustment.
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
Enables easy and efficient adjustment of the guide bush inner diameter with reduced risk of interference, simplifying the setup process and minimizing the need for repeated adjustments.
Implementation Method 1
a retraction sleeve on which a first screw that engages with a bush screw formed on the guide bush and a second screw having a different thread pitch from the first screw are formed
Data Source
AI summary
A guide bush apparatus that supports a rod-shaped workpiece so that the workpiece is free to slide in the axis direction of the workpiece includes a guide bush sleeve, a guide bush that is disposed inside the guide bush sleeve, has a bush screw formed thereon, and has an inner diameter that changes in accordance with the relative position thereof relative to the guide bush sleeve in the axis direction, a retraction sleeve which is disposed inside the guide bush sleeve and on which a first screw that engages with the bush screw and a second screw having a different thread pitch from the first screw are formed, and a differential attachment/detachment body on which a differential screw that engages with the second screw is formed, and which can be fixed to and released from the guide bush sleeve.