Oblique Suction Slit Geometry for Consistent Fiber Bundle Traversing
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Solution Overview
Problem
Existing fiber bundle collecting devices for spinning machines suffer from variations in yarn quality due to inconsistent traversing motion of the fiber bundle along the suction slit, leading to uneven movement and increased abrasion, which affects the quality of the spun yarn.
Innovation Solution
A fiber bundle collecting device with a suction pipe having a guide surface featuring an oblique suction slit with specific side edges, where the upstream portion of one side edge is more oblique than the downstream portion, and the opposite side edge has a downstream portion extending along the guide edge, ensuring a consistent collection path and reducing variations in yarn quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the suction slit is formed with a constant width and linear edges, then the device structure is simple, but the fiber bundle traversing motion becomes inconsistent leading to yarn quality variation
Solution Approach 1:
The suction slit is designed with different geometric characteristics at different locations: the upstream end has a widened region with a curved guide edge having a specific inclination angle, while the downstream portion maintains a different configuration. This local differentiation ensures consistent fiber bundle guidance and traversing motion throughout the suction slit length, resolving the yarn quality consistency issue while maintaining manufacturing feasibility.
Solution Approach 2:
The guide edge at the upstream end of the suction slit is formed with a curved shape instead of a straight line, creating a widened region with specific inclination angles. This curvature design guides the fiber bundle more effectively during traversing motion, ensuring consistent yarn quality while remaining manufacturable.
2Manufacturing precision
If the suction slit is designed with complex curved edges to guide fiber bundle, then yarn quality consistency improves, but the device complexity increases
Solution Approach 1:
The complex curved guide edge is localized only at the upstream end of the suction slit where it is most needed for fiber bundle guidance, while the rest of the suction slit maintains a simpler geometry. This concentrates the complexity only where necessary to achieve consistent yarn quality.
Solution Approach 2:
A curved guide edge with specific inclination angles is introduced at the upstream end to create a widened region, providing effective fiber bundle guidance during traversing motion while maintaining overall structural simplicity.
3Ease of operation
If the suction slit width is increased to accommodate traversing motion, then fiber bundle guidance improves, but the abrasion of the draft device increases
Solution Approach 1:
The curved guide edge at the upstream end creates a widened region that smoothly guides the fiber bundle through traversing motion, reducing abrupt contacts and abrasion on the draft device while maintaining effective guidance throughout the suction slit.
Solution Approach 2:
The widened region with curved guide edge is localized at the upstream end where guidance is most critical, allowing effective fiber bundle traversing while limiting the overall increase in suction slit dimensions that would cause excessive abrasion.
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 device ensures a consistent moving distance of the fiber bundle along the guide edge, thereby improving yarn quality by minimizing variations in hairiness and tenacity, and reducing fluff and fly production.
Implementation Method 1
a suction pipe (15) having a guide surface (28) with a suction slit (27)
Implementation Method 2
a perforated conveyer belt (16) which is wound around the suction pipe (15) and an apron guide (17) and is rotated to deliver the fiber bundle (F)
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A fiber bundle collecting device for a spinning machine includes an apron guide, a suction pipe (15) having a guide surface with a suction slit (27) and a perforated conveyer belt (16). The suction slit (27) is formed oblique with respect to the traveling direction of which the fiber bundle travels in the regions upstream and downstream of the suction slit to have first and second side edges. The second side edge has a downstream end, a downstream portion extending along the first side edge from the downstream end and an upstream end located at a side of the first side edge from a first imaginary line extending from the downstream portion and at a side of the first side edge from an intersecting point located between the first imaginary line and a second imaginary line extending from the upstream end in perpendicular direction to the traveling direction of the fiber bundle.