Screw Driver Alignment Control Under High-Pressure Fitting
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Solution Overview
Problem
Existing screw member tightening and loosening apparatuses face challenges in suitably fitting the fitting part of a rotating body to the fitted part of a screw member due to high pressure contact, which can prevent the rotating body from moving towards the screw member.
Innovation Solution
The apparatus includes a rotating body with a fitting part that is shaped to have a predetermined shape repeating at every predetermined angle, supported for rotation about its axis. A control unit performs specific controls to align, press, and rotate the fitting part relative to the screw member, allowing for appropriate fitting even under high pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotating body is pressed against the screw member with high pressure to ensure fitting, then the fitting reliability is improved, but the rotating body cannot move toward the screw member due to friction
Solution Approach 1:
The patent applies preliminary action by rotating the rotating body in the first rotation direction before pressing it against the screw member. This preliminary rotation pre-positions the fitting part to match the fitted part's orientation, ensuring that when high pressure is applied, the components are already aligned and can maintain fitting without excessive friction that would prevent movement.
Solution Approach 2:
The patent inverts the conventional sequence by rotating in the first direction (e.g., clockwise) before pressing, then rotating in the second direction (e.g., counter-clockwise) after fitting. This reverse rotation sequence allows the fitting surfaces to engage properly under pressure while maintaining the ability to rotate and adjust position as needed.
2Productivity
If the rotating body is rotated at high speed to improve productivity, then the screw member tightening speed is improved, but the fitting part cannot be properly aligned with the fitted part
Solution Approach 1:
The patent applies periodic action by using alternating rotation directions. The rotating body rotates in the first direction to advance engagement, then reverses to the second direction to disengage or adjust, creating a periodic motion pattern. This allows high-speed operation while maintaining precise alignment through controlled reversal cycles that ensure proper fitting engagement.
Solution Approach 2:
The patent makes the rotation direction dynamic by switching between first and second rotation directions based on the fitting stage. During initial engagement, rotation in the first direction advances the fitting part toward the fitted part. When alignment is achieved or adjustment is needed, rotation reverses to the second direction, allowing dynamic adaptation between speed and precision requirements.
Data Source
AI summary
A control unit is configured to performs a first control of controlling a movement unit so that a fitted part of a screw member and a fitting part of a rotating body are axially aligned with each other; a second control of controlling the movement unit to press the fitting part against the fitted part; a third control of, while maintaining a state in which the fitting part is pressed against the fitted part, controlling a rotation-driving unit to rotate the rotating body to a first rotation direction side by a first predetermined angle; a fourth control of, while maintaining the state in which the fitting part is pressed against the fitted part, controlling the rotation-driving unit to rotate the rotating body to a second rotation direction side by a second predetermined angle, which is smaller than the first predetermined angle, the fourth control performed after the third control.