Yarn Winding Tray Control for Vibration-Induced End Drop
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Solution Overview
Problem
In existing yarn winding machines, unnecessary trays are repeatedly transported, leading to yarn end drop and entanglement issues due to vibration during transportation, making it difficult to find the yarn end and potentially causing it to be caught in the transportation path.
Innovation Solution
A yarn winding machine with a tray transporting system that includes a supply path, collection path, return path, conveyor device, and tray controlling device, where the tray controlling device sends trays at a controlled pace based on the difference between the discharge and supply rates of trays from winding units and the bobbin processing device, minimizing unnecessary tray transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trays are repeatedly transported from mainline to bypass line and vice versa, then the tray transporting system can maintain continuous operation, but unnecessary transportation causes yarn end drop and entanglement due to vibration
Solution Approach 1:
The system performs preliminary actions by having the bobbin processing device insert the yarn end into the core tube hole before the tray is supplied to the winding unit. This preliminary insertion ensures the yarn end is secured before any transportation occurs, preventing vibration-induced drop during necessary tray movements.
Solution Approach 2:
The invention extracts and eliminates the harmful repeated transportation of trays from the system. By implementing a bypass line that allows trays to skip unnecessary trips and a control device that manages tray supply based on actual winding unit needs, the system removes the source of vibration that causes yarn end drop while maintaining continuous operation.
2Productivity
If trays are supplied from bobbin processing device to winding units at high speed, then productivity increases, but unnecessary tray transportation increases yarn end drop risk
Solution Approach 1:
The system implements dynamic control of tray supply speed and timing. The control device adjusts when trays are supplied from the bobbin processing device to the winding units based on actual demand, and manages the bypass line operation to minimize unnecessary movements. This dynamic adjustment ensures high productivity when needed while preventing vibration-induced yarn end drop by reducing unnecessary transportation.
3Productivity
If the tray transporting system operates continuously without control, then productivity is maintained, but yarn ends may be caught in transportation path members
Solution Approach 1:
The control device implements feedback control by monitoring the status of winding units and the bypass line, and adjusting tray supply accordingly. This feedback mechanism ensures trays are only transported when actually needed by winding units, preventing unnecessary movements that could cause yarn ends to be caught in transportation path members while maintaining continuous operation when required.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The number KN that is the number of times a tray stopper (35) is caused to perform a sending operation is set to (AN-1-BN-1+CN-1) per cycle U (Step S202). AN-1 is the number of trays discharged from winding units (11) in [N-1]-th cycle UN-1. BN-1 is the number of the trays supplied from a bobbin processing device (12) directly to a supply path (31) or to a portion in a return path (32) that is downstream than the tray stopper in the cycle UN-1. CN-1 is the number of times the tray sending operation is canceled in the cycle UN-1. When the tray is supplied from the bobbin processing device before all the sending operations to be performed in cycle UN are completed (Step S208: YES), the last sending operation is canceled and not performed (Step S209).