Pot Spinning Rewinding Method Preventing Yarn Entanglement
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Solution Overview
Problem
The existing pot spinning method experiences multilayer rewinding defects when a cutting blade is brought into contact with the cake after yarn breakage, leading to entanglement and inability to unravel the yarn during subsequent processes.
Innovation Solution
A rewinding method that includes detecting the lower end of the cake after yarn breakage, disposing a bobbin inside the pot, and using an elongated member to contact the inner wall closer to the opening than the cake lower end, preventing simultaneous lifting of multiple yarn layers during rewinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cutting blade is brought into contact with the cake to lift yarn after breakage, then rewinding can be initiated, but multiple yarn layers are lifted simultaneously causing multilayer rewinding defects
Solution Approach 1:
The patent applies preliminary action by detecting the cake lower end position before the cutting blade contacts the cake. The control unit calculates the appropriate contact position based on the detected lower end, ensuring the blade contacts only the necessary single layer rather than multiple layers simultaneously. This preliminary detection and calculation prevents multilayer rewinding defects before they occur.
Solution Approach 2:
The patent replaces the purely mechanical cutting blade contact system with a controlled system that uses a yarn breakage detection unit, control unit, and calculation mechanism. Instead of direct mechanical contact at a fixed position, the system uses detection and calculation to determine the optimal contact position, substituting mechanical randomness with controlled precision.
2Loss of time
If the cutting blade contacts the cake lower end directly, then rewinding starts immediately, but yarn entanglement occurs making subsequent processing impossible
Solution Approach 1:
The system performs preliminary detection of the cake lower end position and calculates the appropriate contact position before the cutting blade makes contact. This preliminary action ensures that the blade contacts the cake at the correct position, lifting only a single yarn layer rather than causing entanglement of multiple layers, thus maintaining yarn processability.
Solution Approach 2:
The control unit acts as an intermediary between the yarn breakage detection unit and the cutting blade operation. It receives detection signals, calculates the appropriate contact position, and controls the blade's movement and contact timing. This intermediary control prevents direct, uncontrolled blade-cake contact that would cause yarn entanglement.
3Productivity
If multiple yarn layers are lifted together during rewinding initiation, then rewinding can proceed, but yarn entanglement prevents unraveling in subsequent processes
Solution Approach 1:
The control unit performs preliminary detection of the cake lower end and calculates the precise contact position before the cutting blade operates. This ensures that only a single yarn layer is lifted at the contact point, preventing the formation of entangled multiple layers that would be impossible to unravel in subsequent processing.
Data Source
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AI summary
A bobbin (25) and rewinding means are inserted into a pot (12) through an opening (23) of the pot (12). Next, a contact step (S4) is performed. Respective elongated members (73) move in a horizontal direction. In a pot (12) in which yarn breakage has been detected, the elongated member (73) is lifted up in advance, and therefore the elongated member (73) is pressed into contact with an inner wall (22) of the pot (12). Next, a moving step (S5) is performed. The bobbin (25) and the elongated member (73) are raised. As a result, a tip end of the elongated member (73) is pressed into contact with a cake lower end (28b).