Pot Spinning Machine Remaining Yarn Detection Control
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Solution Overview
Problem
In pot spinning machines, remaining yarn in the pot after rewinding can cause issues as new yarn is deposited on top, leading to entanglement and waste, and existing detection methods are inadequate, especially as they require spinning to detect frequency changes which can result in contact with the cake and entanglement.
Innovation Solution
A method for controlling the pot spinning machine that includes an inspection device with a camera and image processor to detect remaining yarn without spinning, and reversely rotating back and middle rollers to prevent new yarn from being deposited on remaining yarn, along with a roving-supply stop device to manage yarn supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotary frequency of the yarn leg is detected during spinning to inspect remaining yarn, then the presence of remaining yarn can be detected, but the yarn introduction pipe or bobbin may contact the cake causing entanglement and waste
Solution Approach 1:
The patent applies preliminary action by detecting remaining yarn through rotary frequency measurement at the very beginning of the spinning process, before the yarn cake becomes thick enough to cause contact issues. The inspection is performed during the initial spinning phase when the yarn leg rotates around the yarn introduction pipe, allowing early detection and prevention of subsequent contact problems between the yarn introduction pipe/bobbin and the cake.
Solution Approach 2:
The system implements feedback by continuously monitoring the rotary frequency of the yarn leg during spinning and comparing it with a predetermined set value. When the rotary frequency deviates from the set value, indicating the presence of remaining yarn, the system provides feedback to stop the spinning process, preventing the yarn introduction pipe or bobbin from contacting the cake and causing entanglement.
2Productivity
If spinning continues without detecting remaining yarn beforehand, then productivity is maintained, but remaining yarn and new yarn become entangled creating waste
Solution Approach 1:
The patent performs preliminary detection of remaining yarn by measuring the rotary frequency of the yarn leg at the start of spinning, before new yarn is deposited on remaining yarn. This early detection allows the system to identify and halt spinning when remaining yarn is present, preventing entanglement between remaining yarn and new yarn while maintaining productivity through timely intervention.
Solution Approach 2:
The system uses feedback control by continuously monitoring rotary frequency during the initial spinning phase and comparing it with predetermined values. When remaining yarn is detected through frequency deviation, the feedback mechanism stops the spinning process, preventing entanglement of remaining yarn with new yarn and eliminating waste while preserving overall productivity.
3Measurement precision
If inspection is performed after spinning starts, then remaining yarn can be detected, but the yarn cake becomes thicker increasing contact risk
Solution Approach 1:
The patent implements preliminary action by performing remaining yarn inspection at the very beginning of the spinning process, before the yarn cake has a chance to thicken. The rotary frequency measurement is conducted during the initial phase when only a thin layer of yarn is deposited, ensuring that the yarn cake remains thin and contact risk is minimized while still achieving accurate detection of remaining yarn.
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
Prevents new yarn from being deposited on remaining yarn, reducing waste and maintaining productivity by accurately detecting remaining yarn without contact and managing yarn supply effectively.
Implementation Method 1
the inspection device with a camera and image processor to detect remaining yarn without spinning
Implementation Method 2
a drafting device (2) that draws out a roving (9) by using friction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for controlling a pot spinning machine (1) includes spinning a yarn (20) supplied from a drafting device (2) in a pot (5, 5-1, 5-2, 5-3) of each of spindles (61, 62, 63), rewinding the yarn (20) spun in the pot (5, 5-1, 5-2, 5-3) onto a bobbin (25), and inspecting each spindle (61, 62, 63) to determine whether a remaining yarn exists in the pot (5, 5-1, 5-2, 5-3) between the end of the rewinding performed after the spinning and the start of next spinning. The method further includes starting a roving-supply stop device (3) of the spindle (61, 62, 63) that is determined in the inspecting as the spindle in which the remaining yarn exists to prevent the yarn (20) from being spun in the pot (5, 5-1, 5-2, 5-3) in the next spinning.