Variable Warp Knitting Fabric Take-off Tension Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Warp knitting machines face challenges in maintaining consistent fabric take-off tension, leading to variations in mesh size and quality, especially at high production speeds.
Innovation Solution
A warp knitting machine with a fabric take-off device featuring a variable distance between the machine bed and the take-up area, adjustable via a drive element, ensures that the fabric take-off tension is optimized by using a rotatable or translatable take-up roller or guide rod, allowing for dynamic adjustment to match stitch formation positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fabric take-off device uses a fixed distance between the machine bed and the ramp-up area, then the device structure is simple, but the mesh size uniformity deteriorates due to varying take-off tension
Solution Approach 1:
The patent applies the dynamics principle by making the distance between the machine bed and the ramp-up area variable rather than fixed. The fabric guide element is coupled to a drive element that dynamically adjusts the distance during the knitting cycle, allowing the take-off tension to be adapted to the position where mesh formation occurs. This dynamic adjustment ensures uniform mesh size while maintaining reasonable device complexity through integration with existing drive mechanisms.
2Manufacturing precision
If the distance between the machine bed and the ramp-up area is made variable, then the mesh size uniformity improves, but the device complexity increases
Solution Approach 1:
The patent merges the fabric take-off function with the existing knitting cycle drive mechanism. The fabric guide element is coupled to a drive element that is already part of the knitting machine's synchronization system, combining multiple functions into a integrated system. This reduces the overall device complexity while achieving the benefit of variable distance adjustment for uniform mesh size.
Solution Approach 2:
The drive element that controls the variable distance is coupled to the knitting cycle, making it a multi-functional component that serves both the knitting process and the fabric take-off tension control. This universal application of the drive mechanism eliminates the need for separate complex control systems, achieving uniform mesh size without excessive device complexity.
3Reliability
If the take-off tension is increased to ensure sufficient product take-off voltage, then the fabric removal reliability improves, but the mesh formation quality deteriorates due to excessive tension
Solution Approach 1:
The patent uses dynamic adjustment of the take-off tension by varying the distance between the machine bed and the ramp-up area during the knitting cycle. The tension is increased only when needed for reliable fabric removal and reduced when mesh formation occurs, ensuring both fabric removal reliability and mesh formation quality are optimized at different phases of the cycle.
Solution Approach 2:
The take-off tension is applied periodically in sync with the knitting cycle. The drive element adjusts the fabric guide element position rhythmically, creating periods of higher tension for fabric removal and periods of lower tension for mesh formation. This periodic action ensures reliable fabric removal without continuously applying excessive tension that would degrade mesh quality.
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 solution results in a more uniform mesh size and improved fabric quality by dynamically adjusting the take-off tension to match the knitting process, particularly effective at high engine speeds.
Implementation Method 1
a distance between a stationary machine bed of the warp knitting machine and the ramp-up area of the fabric guide element is variable, so that a fabric take-off tension with which the knitted fabric is taken off from the knitting area can be standardized by changing the distance
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a warp knitting machine (1) with a knitting area in which knitting tools for producing a knitted fabric (4) are arranged, and with a fabric take-off device (9) for taking off a knitted fabric (4) produced by the warp knitting machine (1) in a knitting process from the knitting area. According to the invention, the fabric take-off device (9) of the warp knitting machine (1) has a fabric guide element with a ramp-up area (7) in which the knitted fabric (4) ramps onto the fabric guide element, wherein a distance between a stationary machine bed (6) of the warp knitting machine (1) and the ramp-up area (7) of the fabric guide element is variable, so that a fabric take-off tension with which the knitted fabric (4) is taken off from the knitting area can be standardized by changing the distance.