Safety Chuck Magnetic Closure Spring Mechanism
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Solution Overview
Problem
Prior art safety chucks with small sliding cam mechanisms wear out quickly due to increased wear as the machine rotates, leading to incomplete closure and reduced lifespan, as they rely on non-robust cam mechanisms for automatic grasping and holding of shafts.
Innovation Solution
A safety chuck design incorporating a closing spring and magnets, where the operator manually opens the chuck, and the magnets hold it in place until the shaft is inserted, then the spring forces it fully closed as the machine rotates, enhancing robustness and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a small sliding cam mechanism is used to automatically close the safety chuck, then the chuck can be automatically grasped and closed about the shaft end, but the cam mechanism wears out quickly after a few dozen to a hundred cycles due to increased wear during machine rotation
Solution Approach 1:
The patent replaces the traditional mechanical sliding cam mechanism with a magnetic field-based closing system. Magnets are positioned on the chuck body to automatically attract and close the movable jaw onto the shaft end, eliminating the need for sliding cam surfaces that wear out. This substitution of mechanical contact with magnetic attraction resolves the wear problem while maintaining automatic closure functionality.
Solution Approach 2:
The patent changes the operating parameters of the closing mechanism by using magnetic field strength instead of mechanical cam geometry. The magnetic force can be adjusted by changing magnet size, material, or positioning, providing a wear-free adjustable closing force that adapts to different shaft sizes and operational requirements, thereby extending mechanism lifespan.
2Productivity
If the safety chuck is not completely closed due to cam mechanism wear, then the machine can continue operating, but the cumulative wear on the cam mechanism increases, shortening its life span
Solution Approach 1:
By replacing the sliding cam mechanism with magnets, the patent eliminates the wear that occurs during continuous operation. The magnetic field maintains consistent closing force without degradation, allowing the chuck to remain completely closed throughout its service life while supporting continuous machine operation without cumulative wear effects.
Solution Approach 2:
The magnetic closing system provides inherent cushioning by allowing the movable jaw to be attracted gradually toward the shaft end rather than through rigid cam contact. This soft magnetic attraction prevents impact damage and maintains complete closure without the progressive wear that would otherwise occur, extending the duration of reliable operation.
3Reliability
If a robust closing mechanism is used to ensure complete closure, then the safety chuck reliability improves, but the device complexity increases
Solution Approach 1:
The patent simplifies the device structure by replacing the complex multi-component sliding cam mechanism with a simple magnetic field system. The magnets can be directly embedded in the chuck body, eliminating the need for separate cam components, sliding surfaces, and adjustment mechanisms, thereby achieving complete closure with reduced structural complexity.
Solution Approach 2:
The magnetic closing force is concentrated locally at the critical closure point where the movable jaw contacts the shaft end. This localized magnetic attraction ensures complete and reliable closure precisely where needed, without requiring a complex mechanism throughout the entire chuck structure, thus maintaining simplicity while achieving high reliability.
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 safety chuck design significantly extends the lifespan of the cam mechanism by reducing wear and ensuring complete closure, maintaining operational reliability through the use of springs and magnets, thereby improving the robustness and durability of the safety chuck.
Implementation Method 1
A spring is inserted into the spindle and the movable jaw, said spring forcing the movable jaw into a closed position
Implementation Method 2
A plurality of magnets are attached to the mounting flange and facing toward the movable jaw. The magnets are adapted to magnetically engage the movable jaw when the movable jaw is in an open position
Data Source
AI summary
A safety chuck mounted to equipment that process web material is provided. The safety chuck is provided with a die spring connecting a moveable jaw with a spindle, said spring urging the moveable jaw into a fully closed position. A number of magnets mounted on a mounting flange will engage the moveable jaw, overcoming the spring's force and holding the moveable jaw in a fully open position. Rotation of the spindle releases the magnets allowing the spring to force the moveable jaw back into a fully closed position.