Warp Knitting Machine Bar Stack Vibration Control
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Solution Overview
Problem
Warp knitting machines experience undesirable vibrations at higher working speeds, leading to potential collisions of knitting tools and deterioration in fabric quality, which are typically mitigated by adding mass to components, resulting in a more complex and costly structure.
Innovation Solution
The bar pack is supported by bearing points that move relative to each other, with the instantaneous center of support lying in the center of mass, allowing for a swinging motion similar to a hanger shaft suspension without the need for a hanger shaft, and the support arrangements are inclined to minimize vibrations and facilitate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working speed of the warp knitting machine is increased, then productivity is improved, but vibrations occur leading to collisions of knitting tools and deterioration of fabric quality
Solution Approach 1:
The invention removes the hanger shaft from the system, extracting the source of vibrations. The bar pack is supported directly at two bearing points on the machine bed, eliminating the intermediate hanger shaft component that generates harmful vibrations at high speeds.
Solution Approach 2:
The invention creates a simplified copy of the traditional suspension system. Instead of using a hanger shaft suspended from walls, the bar pack is supported at two points on the machine bed, replicating the essential support function while eliminating the problematic intermediate components.
2Object-affected harmful factors
If components with larger mass are added to counteract vibrations, then vibration resistance is improved, but device complexity and costs increase
Solution Approach 1:
The invention eliminates the need for additional mass by removing the hanger shaft system entirely. The direct two-point support on the machine bed provides sufficient vibration resistance without requiring heavy counterbalancing components or complex stiffening structures.
Solution Approach 2:
The simplified support system copies only the essential function of the traditional hanger shaft suspension - supporting the bar pack and enabling swing-through movement - while eliminating the need for heavy components and complex vibration-damping structures.
3Ease of operation
If a hanger shaft suspension system is used, then swinging motion is enabled, but vibrations occur at higher working speeds
Solution Approach 1:
The invention extracts the hanger shaft from the system, keeping only the essential swing-through movement capability. The bar pack is supported at two bearing points that allow the same swinging motion necessary for guide bar movement, but without the vibration-generating intermediate components.
Solution Approach 2:
The invention creates a simplified version of the hanger shaft suspension that copies the swing-through motion capability while eliminating the problematic components. The two bearing points provide the necessary articulation for guide bar movement without generating vibrations.
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 configuration enables high working speeds with a simple structure, reduces the risk of vibrations, and maintains fabric quality while eliminating the need for heavy components like hanger shafts and traverses, thus achieving higher speeds at lower costs and with a more compact design.
Implementation Method 1
the bearing points are arranged in the direction of gravity below a plane in which the center of mass of the stack of bars lies
Implementation Method 2
when the bar pack is in a neutral position, the instantaneous center of the support arrangement lies in the center of mass of the bar pack
Data Source
Figure 1~2
AI summary
A warp knitting machine (1) is described, comprising a machine bed (2) and a bar stack (3) with several laying bars (4), which is movable in a swing direction (8) perpendicular to its longitudinal direction by a drive device (13). The aim is to achieve a high working speed with a simple design. For this purpose, the bar stack (3) is pivotally mounted at two bearing points (6, 7) which are spaced apart in the swing direction (8) and are movable relative to each other.