Projectile Launching Rack Driven by Servomotors
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Solution Overview
Problem
Projectile weaving looms face mechanical challenges with high impulsive thrust, leading to uncontrolled projectile behavior and reduced weft insertion speed due to the limitations of torsion-bar and toothed wheel launching systems.
Innovation Solution
A weft insertion system utilizing a rack driven by multiple toothed wheels meshed with electric servomotors, allowing for controlled and evenly distributed thrust, reducing motion inversion time and enabling higher insertion speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a torsion-bar launching device with cam mechanism is used to impart high impulsive thrust to the projectile, then the projectile can be launched with sufficient speed, but the mechanical stresses increase and the control precision of projectile motion deteriorates
Solution Approach 1:
The patent replaces the mechanical torsion-bar and cam mechanism with an electric servomotor that directly drives the rack. This substitution eliminates the complex mechanical transmission components, reducing mechanical stresses and improving reliability while maintaining precise control of the projectile launch speed through electronic control of the servomotor.
2Productivity
If a single powerful motor drives the rack to achieve high insertion speed, then productivity increases, but the motion inversion time increases due to high inertia
Solution Approach 1:
The patent divides the single powerful motor into multiple electric servomotors that collectively drive the rack. Each servomotor has low inertia, enabling rapid motion inversion and acceleration. The combined thrust of multiple motors achieves the required high insertion speed while the low individual inertia allows quick direction changes, reducing motion inversion time and increasing productivity.
3Stability of the object's composition
If a toothed wheel mechanism is used to control projectile acceleration, then the projectile trajectory becomes more stable, but the device complexity increases
Solution Approach 1:
The patent eliminates the toothed wheel mechanism entirely by using electric servomotors with rack drives. The servomotors provide direct, controlled acceleration to the rack, which in turn propels the projectile. This approach achieves stable projectile trajectories through precise electronic control while significantly reducing mechanical complexity compared to toothed wheel systems.
4Speed
If high impulsive thrust is applied to the projectile, then launch speed is achieved, but uncontrolled lateral oscillations occur
Solution Approach 1:
The patent uses electric servomotors that can dynamically adjust the acceleration profile of the rack during the projectile launch. This dynamic control allows the system to apply the necessary thrust for high launch speed while precisely controlling the acceleration to prevent lateral oscillations and ensure accurate projectile trajectory through electronic feedback control.
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 system achieves stable projectile trajectories and increased weft insertion speed, comparable to other weaving looms on the market, by distributing power through multiple low-inertia motors and precise electronic control, minimizing stress and ensuring synchronized motion.
Implementation Method 1
a rack (R) driven into motion by a plurality of toothed wheels (D), arranged in succession along the development of rack R and meshed therewith, each of wheels D being driven by a respective electric servomotor M
Data Source
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AI summary
Weft thread insertion system into a projectile weaving loom, wherein the projectiles (1) are launched into the shed due to the mechanical action of a thrust member provided with alternate cyclic movement consisting of a rack (R) driven into motion by a plurality of toothed wheels (D), each one controlled by a respective electric servomotor (M), arranged in succession along the rack (R) and meshed therewith.