Laser Nozzle Holder Pawl Retraction for Secure, Quick Nozzle Changes
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Solution Overview
Problem
Existing locking mechanisms in material processing systems, such as laser cutting systems, are complex, difficult to manufacture, and provide inconsistent engagement and holding force due to large contact areas and indirect retention force application, making quick and reliable connection and disconnection challenging.
Innovation Solution
A locking mechanism featuring a nozzle holder with a cylindrical hollow body and pawls that extend through apertures, utilizing a sleeve with a spring to bias pawls for engagement and a pawl retractor for disengagement, allowing direct force application for secure alignment and easy interchangeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional locking mechanisms with large contact areas are used, then the connection is stable, but the holding force becomes inconsistent and the mechanism complexity increases
Solution Approach 1:
The locking mechanism is segmented into multiple discrete pawls (typically three) that independently engage with the nozzle. Each pawl is a separate component with simplified geometry, allowing for easier manufacturing and assembly compared to a monolithic locking structure. The segmentation enables consistent engagement through precise geometric relationships between the pawls and the nozzle groove.
Solution Approach 2:
Instead of using a traditional sleeve that retracts to release locking elements, this invention uses a pawl retractor that actively pushes the pawls outward to engage the nozzle. The spring mechanism is positioned to bias the pawls into the engaged position, inverting the conventional approach where the locking elements are passive and require sleeve retraction to disengage.
2Force
If traditional locking mechanisms with indirect retention force are used, then the structure is simple, but the holding force is inconsistent
Solution Approach 1:
The pawls are designed with specific local geometric features including a curved engagement surface that matches the nozzle groove profile. Each pawl has a tailored shape with a leading face, curved surface, and trailing face that optimizes the force distribution during engagement. This local quality optimization ensures consistent holding force while maintaining manufacturing simplicity through standardized pawl geometry.
Solution Approach 2:
The spring force parameter is optimized to provide consistent biasing force on the pawls, ensuring reliable engagement. The pawl retractor geometry is designed with specific dimensional parameters that control the engagement force. By carefully selecting and optimizing these parameters (spring constant, pawl dimensions, engagement angle), the mechanism achieves consistent holding force without complex manufacturing requirements.
3Productivity
If traditional locking mechanisms are used, then the alignment is adequate, but the connection and disconnection process is time-consuming
Solution Approach 1:
The pawls are pre-positioned in the retracted position by the spring bias, ready for immediate engagement. The pawl retractor is pre-configured to apply force in the correct direction and magnitude. This preliminary preparation eliminates the need for manual alignment adjustments during connection, enabling quick insertion while maintaining precise alignment through the geometric design of the pawl-nozzle interface.
Solution Approach 2:
The locking mechanism is self-aligning through the geometric relationship between the pawls and the nozzle groove. As the nozzle is inserted, the pawls automatically orient themselves to engage with the groove, eliminating the need for external alignment tools or manual positioning. The spring-biased pawls self-adjust to the correct engagement position, enabling rapid connection while maintaining precise alignment.
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 solution provides reliable, quick, and easy connection and disconnection with improved holding force and alignment precision by using smaller contact areas and direct force application, addressing the limitations of prior art designs.
Implementation Method 1
The spring configured to exert a biasing force on the plurality of pawls to longitudinally and radially displace the plurality of pawls
Implementation Method 2
The pawl retractor adapted to overcome the biasing force of the spring to longitudinally and radially displace the plurality of pawls away from the laser nozzle for disengagement
Data Source
AI summary
A nozzle holder for a laser processing head of a laser processing system is provided. The nozzle holder includes a substantially cylindrical hollow body shaped to matingly engage a laser nozzle. The hollow body defines a longitudinal axis extending therethrough and a plurality of apertures dispersing around a circumference of the hollow body. The nozzle holder also includes a plurality of pawls configured to operably engage the laser nozzle within the hollow body by extending through the plurality of apertures of the hollow body. The nozzle holder further includes a sleeve substantially surrounding the hollow body and the plurality of pawls. The sleeve includes a pawl retractor that is movable along the longitudinal axis to physically displace the plurality of pawls axially and radially relative to the longitudinal axis for disengagement of the plurality of pawls from the laser nozzle.