Screw Setting Control via Thread-Engagement Detection
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Solution Overview
Problem
Existing hand-held power tools for setting screws face challenges in accurately determining the thread-engagement start time, leading to cumbersome and time-consuming calibration processes for achieving optimal sealing performance.
Innovation Solution
A machine with a controller that continuously monitors parameters such as voltage, amperage, and rotational speed, recognizes the thread-engagement start time, calculates a target number of rotations based on predefined conditions and adjustments, and stops the motor at the right point to ensure accurate screw setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a depth gauge is used to control screw setting depth, then sealing performance can be achieved, but calibration becomes cumbersome and time-consuming
Solution Approach 1:
The patent replaces the mechanical depth gauge system with an electrical control system that monitors motor parameters (current, speed, position) to automatically determine thread engagement and control screw setting depth. This substitution eliminates the need for manual depth gauge calibration while maintaining precise depth control, thereby resolving the contradiction between manufacturing precision and time loss.
2Ease of operation
If motor runs for fixed time or rotations, then operation is simple, but thread-engagement start time detection becomes inaccurate
Solution Approach 1:
The patent implements a feedback system that continuously monitors motor parameters (current, speed, position) during operation and uses this information to dynamically determine the thread-engagement start time. This feedback mechanism maintains operational simplicity while significantly improving measurement precision by automatically detecting parameter changes that indicate thread engagement, eliminating the need for complex manual calibration.
3Manufacturing precision
If depth gauge calibration is performed under certain circumstances, then accurate depth control is achieved, but the process becomes cumbersome and complex
Solution Approach 1:
The patent enables the system to automatically determine thread engagement and control depth without requiring external calibration tools or manual intervention. The controller monitors motor parameters and autonomously adjusts the screw setting process, making the system self-sufficient and eliminating the complex calibration procedures previously required to achieve accurate depth control.
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 reliable and efficient screw setting by compensating for time discrepancies in thread-engagement recognition, ensuring precise sealing performance without manual calibration.
Implementation Method 1
providing electric current to the motor to rotationally drive the shaft
Data Source
AI summary
A machine and a method for setting a screw, wherein the machine includes a motor having a shaft, and a controller provided for providing electric current to the motor to rotationally drive the shaft, continuously determining a first parameter characterizing a setting process, recognizing a thread-engagement start time if the first parameter meets a predefined set of conditions, determining a second parameter affecting a time difference between the recognized thread-engagement start time and a real thread-engagement start time, calculating a target number of rotations to be performed by the motor after the recognized thread-engagement start time in dependence on the second parameter, and stopping the motor when the motor has performed the target number of rotations after the recognized thread-engagement start time.