Clamping Device Collet Change via Axial Pull Rod Displacement
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Solution Overview
Problem
Current clamping devices require excessive effort to change the collet due to the lack of targeted control over the axial position of the pull rod, which is only movable between two end positions, necessitating manual adjustment of a stop for changing the collet.
Innovation Solution
The clamping device allows for axial displacement of the pull bar relative to the pull rod between operating and changing positions, facilitated by a switching mechanism such as a rotating switching ring or bayonet connection, enabling easier collet change without dismantling, through a coupling device that enables axial displacement via rotary movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pull rod is designed to move only between two end positions with a fixed stop, then the clamping device structure is simple, but the collet change process becomes complex and requires manual adjustment of stops
Solution Approach 1:
The pull rod is designed with dynamic positioning capability, allowing it to be selectively fixed at multiple axial positions (clamping position, releasing position, and changing position) rather than being limited to only two end positions. This is achieved through a mechanism that enables the pull rod to be locked at different locations along its travel path, providing operational flexibility for collet changes without requiring manual stop adjustments
Solution Approach 2:
The clamping device incorporates a self-positioning mechanism that automatically provides the changing position for the collet without requiring external manual intervention to adjust stops. The device structure itself includes features that guide and position the pull rod at the appropriate axial location for collet removal, making the system self-sufficient for facilitating collet changes
2Device complexity
If the pull rod is constrained to only two end positions, then the control mechanism is simple, but the effort required for collet replacement increases
Solution Approach 1:
The control mechanism enables the pull rod to access three distinct positions: the clamping position for workpiece holding, the releasing position for workpiece release, and the changing position for collet removal. This dynamic multi-position capability reduces the force required for collet replacement by providing an optimal changing position where the collet is naturally positioned for easy removal, eliminating the need for excessive manual force
3Device complexity
If manual stop adjustment is required for collet change, then the device structure is simpler, but the time required for collet change increases
Solution Approach 1:
The device incorporates self-positioning features that automatically guide the pull rod to the changing position without requiring manual stop adjustment. The structure includes guide surfaces, positioning elements, or mechanical features that automatically establish the correct axial position for collet removal, eliminating the time-consuming manual stop adjustment step while maintaining relatively simple device structure
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
This design simplifies the collet change process by allowing manual axial displacement of the tension sleeve relative to the tension rod, reducing the effort required for collet replacement and facilitating easier workpiece changes.
Implementation Method 1
a pull sleeve for axial force transmission from the pull rod to the collet by means of a pull web which interacts with the collet in a form-fitting manner
Implementation Method 2
with sliding surfaces preferably being provided on the inside of the chuck and on the outside of the collet that are inclined relative to the axial direction. The axial movement of the collet relative to the chuck can cause the clamping segments of the collet to contract radially via these sliding surfaces
Implementation Method 3
In this case, elastic sections provided between the clamping segments of the collet are usually compressed. By displacing the collet in the opposite direction relative to the chuck, the collet can be expanded, this being effected by the said elastic intermediate elements between the clamping segments
Data Source
AI summary
The application relates to a clamping device (10) for clamping a workpiece with a chuck (20), a collet (30) mounted in the chuck (20) with a plurality of ring-shaped clamping segments (32), wherein the collet can be radially expanded and radially contracted relative to the chuck (20) for the purpose of clamping and releasing the workpiece by axial movement, a drawbar (40) which is axially displaceable relative to the chuck (20), and a draw sleeve (50) for axial force transmission from the drawbar (40) to the collet (30) with a drawbar (57) which engages positively with the collet (30). To facilitate the changing of the collet (30), it is proposed to design the drawbar (57) to be axially displaceable relative to the drawbar (40) between an operating position and a changing position.