Quick Change Jaw System Using Cam-Actuated Dovetail Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing quick-change jaw assemblies for rotary machine tools are costly and prone to human error due to the need for remachining and maintaining matched pairs of jaws, which complicates interchangeability and increases inventory costs, while complex mechanisms often fail to provide reliable chucking tolerances.
Innovation Solution
A quick change jaw system featuring a master jaw with a dovetail aperture and a top jaw with a complementary groove, secured by a cam mechanism that provides a positive biasing force for precise alignment, allowing for interchangeable and durable jaw assembly without the need for remachining or maintaining matched pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If top jaws are remachined after changeover to maintain concentricity, then clamping surface precision is improved, but production time and cost increase
Solution Approach 1:
The master jaw is pre-machined with precision reference surfaces and abutment surfaces before use. The top jaw is pre-machined with complementary reference surfaces. When assembled, these pre-machined surfaces automatically align to ensure concentricity without requiring post-assembly remachining, thus resolving the contradiction between maintaining precision and avoiding time-consuming remachining operations.
2Manufacturing precision
If top jaws and master jaws are marked and maintained as matched pairs, then clamping surface tolerances are maintained, but inventory cost and complexity increase
Solution Approach 1:
The master jaw is designed with universal reference surfaces and abutment surfaces that can interface with any top jaw having complementary reference surfaces. This universal design allows any top jaw to be interchangeably mounted on any master jaw while maintaining precision, eliminating the need for matched pairs and reducing inventory complexity while preserving tolerance requirements.
3Adaptability or versatility
If complex mounting mechanisms with spring biasing are used for interchangeable jaws, then jaw interchangeability is improved, but reliability and chucking tolerances deteriorate
Solution Approach 1:
The invention extracts and eliminates the unreliable spring biasing mechanisms from the jaw assembly. Instead, it relies on the inherent geometric precision of the machined reference surfaces and abutment surfaces, combined with a simple cam-actuated clamping mechanism, to achieve both interchangeability and reliable chucking tolerances without complex components.
4Device complexity
If a single fastener is used to secure top jaw to master jaw, then device complexity is reduced, but sufficient biasing force for alignment may not be achieved
Solution Approach 1:
The cam mechanism transforms a simple rotational motion of the fastener into a dynamic clamping action that generates substantial biasing force. As the cam is rotated, its geometry converts the rotational movement into linear displacement that urges the reference surfaces into coengagement, providing sufficient force for precise alignment while maintaining a simple single-fastener design.
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 rapid jaw changes with minimal loss of chucking concentricity, reduces inventory costs, and ensures precise alignment without the need for complex mechanisms, facilitating efficient and reliable operation in high-production environments.
Implementation Method 1
a cam disposed in the master jaw for actuating the retaining or clamping device for urging the second pair of coplanar abutment surfaces of the top jaw into coengagement with the first pair of coplanar abutment surfaces of the master jaw
Implementation Method 2
a dovetail portion being disposed in the first aperture of the master jaw; a top jaw formed with a groove longitudinally extending along a length of the top jaw, the groove being complementary to the dovetail portion and configured for engaging the dovetail portion
Data Source
AI summary
A quick change jaw system for chucks is provided. The quick change jaw assembly includes a master jaw including a first pair of coplanar abutment surfaces defining a first aperture; a clamping device including a dovetail portion being disposed in the first aperture of the master jaw, wherein the dovetail portion rests above the first pair of coplanar top surfaces of master jaw; a top jaw formed with a groove longitudinally extending along a length of the top jaw, the groove being complementary to the dovetail portion and configured for engaging the dovetail portion, the top jaw including a second pair of coplanar abutment surfaces extending along opposite sides of the groove; and a cam for actuating the clamping device for urging the second pair of coplanar abutment surfaces of the top jaw into coengagement with the first pair of coplanar abutment surfaces of the master jaw.