Weft Feeder Wire Strand Transmission Adjust Winding Circumference
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Solution Overview
Problem
Existing weft feeder devices with adjustable winding drums face issues of excessive wear due to wobbling guiding structures and require fixed drum segments, which complicates the adjustment of the winding circumference and increases mechanical stress.
Innovation Solution
A weft feeder device with a central drive wheel and wire strands that transmit motion to driven legs, allowing for adjustable winding circumference without significant play, using interconnected wire strands to maintain tension and prevent unwanted movement of drum segments during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wobbling guiding structure is used to move feeding drum segments, then the winding circumference can be adjusted, but excessive wear occurs on the legs, guiding structure and housing
Solution Approach 1:
The patent replaces the mechanical wobbling guiding structure with a wire strand transmission system. The wire strands connect the drive wheel to the drum segments, transmitting motion without requiring physical contact between moving parts. This substitution eliminates the wear problem while maintaining adjustability.
Solution Approach 2:
The wire strands act as intermediaries between the drive wheel and the drum segments. Instead of direct mechanical contact causing wear, the wire strands transmit the driving force, reducing friction and wear on the guiding structure and housing.
2Stability of the object's composition
If drum segments are fixed in position to maintain set winding circumference, then stability is improved, but adjustment of winding circumference becomes complicated
Solution Approach 1:
The patent makes the drum segments dynamic by allowing them to move radially along the drum axis. The wire strand transmission system enables easy adjustment of the winding circumference by rotating the drive wheel, which moves the drum segments to the desired position. Once adjusted, the segments remain stable at the new position.
3Device complexity
If wire strands are used to connect drive wheel to driven legs, then motion transmission is simplified, but play may occur during operation
Solution Approach 1:
The wire strands are pre-tensioned during assembly to eliminate play before operation begins. This preliminary tensioning ensures that the wire strands remain taut during operation, maintaining precise positioning of the drum segments without requiring complex adjustment mechanisms.
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 simplifies the adjustment of the winding circumference while minimizing mechanical stress and wear, ensuring precise control over the winding process without excessive movement of drum segments, thus enhancing the device's operational efficiency and longevity.
Implementation Method 1
The wire strand can be held under tension for avoiding a movement of the driven leg and, thus, of the associated drum segment during operation of the weft feeder device when the winding circumference is to be kept constant.
Data Source
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AI summary
Weft feeder device comprising a winding drum (1) and a drive mechanism (2) that comprises a central drive wheel (6, 60) arranged coaxially with respect to the drum axis (10), wherein the winding drum (1) comprises at least one drum segment (3, 4, 5; 30, 40, 50) mounted so as to be moveable in a radial direction about the drum axis (10), wherein the drum segment (3, 4, 5; 30, 40, 50) comprises at least a first driven leg (11, 12, 13; 110, 120, 130) drivingly coupled to the drive wheel (6, 60), wherein the drive mechanism (2) further comprises at least one wire strand (7, 8, 9) extending along the periphery of the central drive wheel (6, 60) for a motion transmission from the drive wheel (6, 60) to the driven leg (11, 12, 13; 110, 120, 130), which at least one wire strand (7, 8, 9) is fixed to the driven leg (11, 12, 13; 110, 120, 130) and to the central drive wheel (6, 60).