Weft Thread Presentation Guiding Element
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Solution Overview
Problem
Existing apparatuses for presenting weft threads to weaving machines face challenges in achieving a large stroke at high speeds due to transverse forces exerted by the crank mechanism, which result in frictional forces and limitations in the movement of presenting elements.
Innovation Solution
The apparatus employs a guiding element to support the connecting rod, compensating transverse forces and allowing the presenting element to move only in the longitudinal direction, minimizing friction and enabling high-speed movement over a large distance, with a crank mechanism and connecting rod system that includes a pivot and elastic supports for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the presenting element is directly connected to the crank without a guiding element, then the structure is simpler, but transverse forces cause frictional forces that limit high-speed movement
Solution Approach 1:
A guiding element is introduced as an intermediary component between the crank mechanism and the presenting element. This guiding element specifically compensates for transverse forces generated during crank rotation, allowing the presenting element to move smoothly in the longitudinal direction without experiencing harmful frictional forces from transverse movements. The guiding element acts as a mediator that isolates the presenting element from the problematic transverse force components.
2Productivity
If the presenting element is moved over a large distance at high speeds, then productivity increases, but frictional forces in bearing points increase
Solution Approach 1:
The harmful transverse force components are extracted and isolated from the presenting element through the guiding element. By separating the longitudinal movement function from the transverse force interference, the system enables large-stroke high-speed movement of the presenting element without the energy loss that would otherwise occur due to friction in bearing points caused by transverse forces.
3Length of moving object
If multiple elements are used in the crank mechanism to achieve large stroke, then the stroke increases, but the inertia of the mechanism increases
Solution Approach 1:
The pivot connection between the presenting element and connecting rod is designed to be formed at the height of the guiding element, creating a dynamic configuration where the presenting element's movement is directly coupled with the connecting rod's motion. This dynamic arrangement allows the stroke to be optimized without requiring additional heavy elements, as the geometry of the pivot and guiding element arrangement naturally provides the necessary movement range.
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 allows for high-speed, long-distance movement of presenting elements with reduced friction and inertia, enabling efficient weft thread presentation, and the modular design simplifies adaptation to different fabric requirements and facilitates easy replacement.
Implementation Method 1
the guiding element is able to compensate transverse forces exerted on the connecting rod by the crank, so that the presenting element is only subjected to forces in its longitudinal direction
Implementation Method 2
the presenting element is connected to the connecting rod by a pivot, wherein the pivot is formed at the height of the guiding element
Implementation Method 3
The support on which the bearing bush is attached to the frame preferably comprises an elastic rubber socket. Due to the mounting of the presenting elements with 'elastic' supports, the presenting elements are allowed to move within defined limits with the weft thread
Implementation Method 4
the bearing bush comprises a pin received rotatably by the support for allowing the presenting elements to move with the weft thread
Data Source
Figure 1~2
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Figure 4~6
AI summary
The invention relates to an apparatus for presenting weft threads to an insertion device of a weaving machine, comprising at least one presenting element (2) mounted displaceable in longitudinal direction between a rest position and a feed position, a crank mechanism (3) for driving the at least one presenting element (2) with a crank (30) and a connecting rod (31), wherein the at least one presenting element (2) is attached to the connecting rod (31), and wherein the connecting rod (31) is supported by a guiding element (6) for compensating transverse forces.