Winding Device Tension-Activated Severing Mechanism
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Solution Overview
Problem
Existing winding devices face issues with reliable and efficient transfer of fiber strands between spindles, particularly at low speeds, due to undefined severing points and potential fraying, which can lead to process interruptions and require complex external actuators for thread guidance and separation.
Innovation Solution
The solution involves a take-up device where the fiber strand is severed only after reaching a minimum tension, using a knife and a blocking mechanism with a rocker arm and force transmitter to ensure clean separation, and a traversing yarn guide formed by orthogonal rollers for independent thread path control, allowing seamless transfer without external energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a stationary cutting edge is used to sever the fiber strand, then the separation can be performed without additional actuators, but the severing point is undefined and partial cuts occur leading to fraying at low speeds
Solution Approach 1:
The cutting edge is made movable relative to the fiber strand path through a rocking motion. The cutting device includes a cutting edge mounted on a rockable support, where the support can rock between a first position (when the fiber strand is not tensioned) and a second position (when the fiber strand is tensioned). This dynamic positioning ensures the cutting edge is only in contact with the fiber strand when proper tension is achieved, preventing premature or partial cuts.
Solution Approach 2:
The system uses the fiber strand tension itself as feedback to control the cutting action. When the fiber strand reaches sufficient tension, it automatically triggers the cutting edge to move into the cutting position through the rockable support mechanism. This feedback-based control ensures cutting occurs at the correct moment without requiring external sensors or actuators.
2Productivity
If the fiber strand is severed before reaching minimum tension, then the transfer can be initiated early, but the fiber strand may not be properly gripped leading to fraying and process interruptions
Solution Approach 1:
The system prepares the cutting edge in advance but keeps it in a non-cutting position until the fiber strand reaches the required tension. The rockable support positions the cutting edge such that it is ready to cut but only makes contact with the fiber strand when the tension condition is met. This preliminary positioning without premature action ensures both speed and reliability.
3Manufacturing precision
If additional actuators are used for thread guidance and separation, then precise control of the severing point is achieved, but the device complexity and external energy requirements increase
Solution Approach 1:
The fiber strand itself serves as the actuating force for the cutting mechanism. The tension in the fiber strand automatically rocks the support to bring the cutting edge into position, eliminating the need for external actuators. The system uses the energy and motion already present in the fiber strand transfer process to control the severing action.
Solution Approach 2:
The rockable support acts as an intermediary mechanism between the fiber strand tension and the cutting edge. It translates the linear tension force of the fiber strand into the rotational motion required to position the cutting edge, providing precise control without direct mechanical linkage or external actuators.
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 approach ensures reliable and efficient transfer of fiber strands between spindles, preventing fraying and process interruptions, even at low speeds, by ensuring the fiber strand is gripped and severed only when sufficient tension is achieved, and allows for independent thread path control without external actuators.
Implementation Method 1
The use of a permanent magnet, which fixes the metallic holding arm with a magnetic holding force, has proven particularly effective as a force transmitter.
Implementation Method 2
The actuating force of the rocker arm is determined by the thread tension of the fiber strand, which acts on the guide arm.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a winding device for continuously winding a fiber strand. The winding device has a rotatably supported winding revolver (2) having two rotationally drivable winding spindles (3.1, 3.2), which are retained on the winding revolver in a protruding manner and which each have a winding sleeve (5.1, 5.2) and a catching apparatus (4.1, 4.2) On the winding revolver (2), two severing apparatuses (7.1, 7.2) are associated with the winding spindles (3.1, 3.2). The severing apparatuses cause the fiber strand to be severed when the fiber strand is transferred from one of the winding spindles having a wound full spool to other winding spindles. A traversing apparatus (8) is arranged upstream of the winding spindles and has a traversing thread guide (9), which can be moved parallel to the winding spindles and which can be positioned outside of a traversing stroke in order to transfer the fiber strand. In order to obtain defined severing of the fiber strand at relatively slow process speeds, each severing apparatus (4.1, 4.2) has a blade (27) and a locking means (26) associated with the blade, wherein the fiber strand (42) is guided by the blocking means (26) before the severing and wherein the fiber strand (42) causes a release of the locking means (26) when a minimum tensile force is reached and can be fed to the blade (27).