Kink Prevention Device for Winding Machines
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Solution Overview
Problem
Existing kink prevention devices for winding machines are slow-acting and generate unstable tension, leading to incomplete prevention of kinks and irregular yarn introduction into the splicer, due to their design limitations and placement on the bobbin tube.
Innovation Solution
A kink prevention device with a presser element and striker, actuated by pneumatic, electric, or hydraulic means, positioned above the unwinding area to apply continuous friction and tension to the yarn, ensuring immediate action and stable tension from yarn clearer cutting to winding restart, without occupying additional space on the yarn path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush or ferrule is placed on the bobbin tube to generate friction and tension on the yarn, then kink prevention is achieved, but the device is slow-acting and generates unstable tension
Solution Approach 1:
The presser element is made movable along the yarn path, allowing it to dynamically adjust its position and apply friction only when needed (when the yarn is pulled by the clearer). This dynamic mechanism enables immediate response to yarn tension changes while maintaining stable friction contact, resolving the contradiction between slow response and unreliable kink prevention
Solution Approach 2:
A striker element is introduced as an intermediary between the presser element and the yarn. The striker transfers the friction force from the presser element to the yarn through direct contact, enabling more efficient and immediate force transmission. This intermediary mechanism accelerates the response time while maintaining stable tension application
2Reliability
If the kink prevention device is positioned on the bobbin tube, then it can apply friction to the yarn, but it occupies additional space on the yarn path and creates dust accumulation issues
Solution Approach 1:
The kink prevention function is relocated from the horizontal yarn path (on the bobbin tube) to a vertical dimension (above the yarn path). The presser element moves vertically to apply friction to the yarn as it passes overhead, eliminating the need for additional horizontal space and preventing dust accumulation in the yarn path while maintaining effective tension application
3Reliability
If a heavy or complex kink prevention device is used to ensure stable contact with the yarn, then reliable tension is generated, but the device acts slowly and reduces cycle efficiency
Solution Approach 1:
The presser element is designed to be actuated automatically by the yarn itself. When the yarn is pulled by the clearer, it naturally activates the presser element through the striker mechanism, eliminating the need for external heavy actuation systems. This self-service approach provides reliable friction contact while maintaining fast response and high cycle efficiency
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 provides immediate and continuous tension to prevent kink formation and ensure smooth yarn introduction into the splicer, enhancing cycle efficiency and reducing dust accumulation issues, while being lightweight and compact.
Implementation Method 1
a head shaped to exert a pressure and friction action on the yarn
Implementation Method 2
actuated by pneumatic, electric, or hydraulic means
Implementation Method 3
actuated by pneumatic, electric, or hydraulic means
Data Source
Figure 1a~2b
Figure 3
Figure 4~5
AI summary
A kink prevention device (4) for a winder comprising a presser element (24), movable along a transverse direction of actuation (T-T) from a rearward position to a forward position according to an actuation stroke, the presser element (24) being provided with a rod (28), operatively connected to actuation means (32) and a head (36), associated with the rod (28) and shaped so as to exert a pressure and friction action on a yarn (12), a striker (40), separate from and opposed to the presser element (24) along said transverse direction of actuation (T-T), on the opposite side of a receiving volume (44) of the associated yarn (12), so that the yarn (12) is located between the head (36) and the striker (40). The striker (40) is equipped with an end wall (48) that defines an end stop of the forward position of the presser element (24).