Yarn Winding Device Acceleration Control
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Solution Overview
Problem
Conventional yarn winding devices face issues with unstable yarn tension and reduced yarn storage capacity due to the need to stop and reverse the drum for yarn joining operations, leading to inefficient winding and potential yarn breakage.
Innovation Solution
A yarn winding device with a control section that performs acceleration rate changing control to stabilize yarn tension by gradually increasing the rotation speed of the rotary body after yarn joining, using two distinct acceleration rates to prevent tension instability and rapidly recover yarn storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drum of the yarn storage section is stopped or reversely rotated to carry out yarn joining operation, then the yarn joining operation can be performed, but the yarn storage amount is reduced and yarn tension becomes unstable
Solution Approach 1:
The control section performs acceleration rate changing control to gradually increase the rotation speed of the rotary body after yarn joining operation. By controlling the acceleration rate, the system preliminarily prepares the yarn tension before rapid rotation, preventing tension instability and yarn breakage while recovering yarn storage amount efficiently
Solution Approach 2:
The invention changes the acceleration rate parameter during the rotation recovery process. The control section adjusts the acceleration rate from a lower initial value to a higher value after a predetermined time, optimizing both yarn tension stability and yarn storage recovery speed
2Productivity
If the drum starts to be rotated rapidly to recover yarn storage amount, then the yarn storage amount is recovered quickly, but the tension applying device is flipped and yarn tension becomes unstable
Solution Approach 1:
The control section implements a two-stage acceleration process where the rotary body first rotates at a lower acceleration rate for a predetermined time to stabilize yarn tension, then transitions to a higher acceleration rate to rapidly recover yarn storage amount. This preliminary stabilization prevents the tension applying device from being flipped
Solution Approach 2:
The invention dynamically changes the acceleration rate parameter based on the operational stage. By switching from a first acceleration rate to a second acceleration rate after a predetermined time, the system optimizes both yarn tension stability during the transition phase and productivity during the recovery phase
Data Source
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AI summary
A winding unit (2) includes a yarn supplying section (7), a yarn storage section (5), a package forming section (8), a yarn joining device (14), a tension applying section (12), and a control section (25). The yarn storage section (5) winds and stores a yarn (20) supplied by the yarn supplying section (7) around a yarn storage roller (32). The package forming section (8) pulls out the yarn (20) from the yarn storage section (5) and winds the pulled out yarn (20) to form a package (30). The yarn joining device (14) connects the yarns when the yarn (20) is disconnected between the yarn supplying section (7) and the yarn storage section (5). The tension applying section (12) is arranged between the yarn supplying section (7) and the yarn storage section (5), and is adapted to apply tension to the yarn (20). After completion of the yarn joining operation by the yarn joining device (14), the control section (25) performs a control to rotate the yarn storage roller (32) from a stopped state while changing the acceleration rate in the winding direction of the yarn storage roller (32).