Machine Tool Chuck Jaw Locking for Safe Jaw Changes
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Solution Overview
Problem
Existing chucks for machine tools, such as lathes, face operational reliability issues due to the risk of incorrect operation during clamping, leading to potential errors and increased downtimes.
Innovation Solution
A chuck design with a safety mechanism where each release element is rotatably mounted about an axis transverse to the chuck axis, ensuring the chuck piston is mechanically locked in a defined safety position, allowing movement only when all driving jaws are in their working position, and incorporating a control mechanism to prevent jaw changes unless a clamping jaw is present in the guide groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release mechanism with a locking device is provided to prevent incorrect operation, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the release mechanism and locking device into an integrated unit where the release element itself performs both releasing and locking functions. The release element can be moved between a release position (allowing jaw change) and a locked position (preventing jaw change), merging two previously separate functions into one component, thus improving reliability without proportionally increasing complexity
Solution Approach 2:
The locking device is designed to automatically engage and disengage based on the position of the release element. When the release element is in the locked position, the locking device automatically prevents incorrect operation without requiring additional active control, making the system self-regulating and reducing the need for complex external control mechanisms
2Ease of operation
If the release element is rotatably mounted about an axis transverse to the chuck axis, then ease of operation is improved, but device complexity increases
Solution Approach 1:
Instead of mounting the release element to rotate about the chuck axis (conventional approach), the patent inverts the approach by mounting it to rotate about an axis transverse to the chuck axis. This inversion allows the release element to be operated more easily from the side, improving accessibility and ease of operation while the compact transverse mounting minimizes the increase in device complexity
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 significantly reduces the risk of incorrect operation by ensuring the chuck piston can only apply clamping force when all driving jaws are in their working position, thereby minimizing the risk of errors and reducing downtimes by securely locking the piston in the safety position.
Implementation Method 1
each release element being rotatably mounted in the chuck body about an axis of rotation that is transverse to the chuck axis... a first rotary position of the release element being the working position of the associated driving jaw and a second rotary position of the release element being the jaw changing position
Data Source
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AI summary
The chuck (1) has several radially extending guide grooves (4) for receiving jaws (5) and an axially movable chuck piston (13). Each guide groove (4) is associated with a drive jaw unit (6) which has a base body (7) that is movable parallel to the guide groove (4). A drive jaw (11) is held on the base body (7) and is axially movable relative to it. The drive jaw has a front toothing (12) that can be engaged with a corresponding mating toothing on a jaw (5). A release element (14) is coupled to the drive jaw (11) to adjust the drive jaw (11) between a rear jaw change position and a front working position.Movement of the release element (14) from a first position corresponding to the working position of the drive jaw (11) to a second position corresponding to the jaw change position of the drive jaw (11) is only possible if the chuck piston (13) is in a defined axial locking position. The chuck piston (13) is locked in the locking position when the release element (14) is in its second position.