Double Acting Pneumatic Gate for Tufting Machine
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Solution Overview
Problem
Existing sliding gate structures in tufting machines for producing both loop pile and cut pile stitches face issues with durability and biasing force consistency, leading to mechanical fatigue, sticking, and inefficient operation due to internal biasing elements like springs, which are not easily inspectable and result in defective carpet patterns and waste.
Innovation Solution
A double acting pneumatic sliding gate structure using an array of pneumatic cylinders with a compact design, where high pressure is applied to move the gate to its closed position and low pressure to return it to the open position, maintaining consistent force and reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If internal biasing elements (springs) are used in pneumatic cylinders to return the gate to open position, then the gate can automatically return without additional pneumatic components, but the biasing force diminishes over time due to spring fatigue and the elements are not inspectable leading to undetected failures
Solution Approach 1:
The patent removes the internal spring biasing element from the pneumatic cylinder, extracting the problematic component that caused reliability issues. The gate return function is achieved through external means (pneumatic pressure control) rather than internal mechanical biasing, eliminating spring fatigue and inspection difficulties while maintaining system functionality
Solution Approach 2:
The patent replaces the mechanical spring biasing system with a pneumatic pressure control system. Instead of relying on mechanical spring force to return the gate, the system uses controlled pneumatic pressure differentials, substituting a mechanical recovery mechanism with a pneumatic one that offers better reliability and controllability
2Ease of operation
If a spring is compressed to return the gate to retracted position, then the gate can be forced to the extended position, but the increased biasing force causes friction that makes the gate stick or fail to reach full extension
Solution Approach 1:
By removing the internal spring, the patent eliminates the variable biasing force that increased friction and caused sticking. The gate movement becomes smoother and more predictable without the opposing spring force that varied with compression level
Solution Approach 2:
The patent changes the force parameter from a variable spring biasing force to a controlled pneumatic pressure force. This allows for more consistent and predictable gate movement without the friction-sticking problems caused by increasing spring compression force
3Ease of operation
If the spring force is reduced to allow full retraction, then the gate can return to open position, but the weakened spring force fails to exhaust all air from the cylinder causing the gate to stick before full retraction
Solution Approach 1:
Removing the spring eliminates the force exhaustion problem entirely. The pneumatic system can fully exhaust air from the cylinder without relying on spring force, ensuring complete gate retraction without sticking while maintaining operational speed
Solution Approach 2:
The pneumatic exhaustion system replaces the mechanical spring force system, allowing complete air evacuation and full gate retraction without the force limitations that caused sticking. This substitution resolves both the sticking issue and maintains productivity
4Ease of repair
If springs are used to bias the gate, then the gate can be returned to open position, but the springs are not visible for inspection and rust formation cannot be detected until performance degradation occurs
Solution Approach 1:
By extracting the spring from the system, the patent eliminates the inspection and rust detection problems. The pneumatic system components are accessible and inspectable, allowing early detection of issues before they cause performance degradation or failure
Solution Approach 2:
Replacing the hidden mechanical spring system with an accessible pneumatic system improves maintenance capability. Pneumatic components can be visually inspected for rust and wear, and replaced individually without replacing entire cylinder blocks, enhancing both reliability and ease of repair
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 ensures reliable and efficient operation of the sliding gate, preventing sticking and mechanical fatigue, while allowing for easy maintenance and reducing waste by maintaining consistent biasing force and durability, thus improving the production of tufted fabrics.
Implementation Method 1
A double acting pneumatic sliding gate structure uses an array of pneumatic cylinders with a compact design, where high pressure is applied to move the gate to its closed position and low pressure to return it to the open position
Data Source
AI summary
A gated looper apparatus has an array of individually mounted pressurizable air cylinders with piston rods acting in communication with looper gates. The air cylinders are designed to be responsive to pneumatic pressure to extend and retract the associated piston rods.