Air Jet Loom Reed Vibration Detection Using Reflection Optical Sensor
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Solution Overview
Problem
Existing methods for determining reed vibration amplitude in air jet looms fail to accurately measure vibrations within the weaving width, leading to decreased weaving efficiency and compromised warp yarn quality due to incorrect spindle rotational speed adjustments.
Innovation Solution
A method involving a reflection optical sensor insertable into the shed between warp yarns, which detects signals during periods when no weft yarn is present in the weft passage to determine reed vibration amplitude within the weaving width, allowing for precise adjustments to spindle speed without adversely affecting warp yarn quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is disposed outside the weaving width to detect reed vibration amplitude, then erroneous detection is prevented, but the detected amplitude does not reflect the actual vibration within the weaving width where warp yarns are passed
Solution Approach 1:
The patent transitions from detecting reed vibration outside the weaving width (traditional approach) to detecting vibration within the weaving width by inserting the sensor through the shed between warp yarns. This dimensional change in sensor placement enables direct measurement of the vibration amplitude that actually affects warp yarn quality, resolving the contradiction between preventing erroneous detection and measuring actual weaving width vibration.
2Productivity
If the rotational speed of the spindle is increased to improve weaving efficiency, then productivity increases, but the amplitude of reed vibration becomes large and adversely affects warp yarn quality
Solution Approach 1:
The patent implements a feedback mechanism where the sensor continuously detects reed vibration amplitude within the weaving width, and this detection result is fed back to the controller. The controller then adjusts the spindle rotational speed based on this feedback to maintain vibration amplitude within a range that does not adversely affect warp yarn quality, while still maximizing weaving efficiency. This closed-loop control resolves the contradiction between productivity and manufacturing precision.
3Manufacturing precision
If the rotational speed of the spindle is decreased to reduce reed vibration amplitude and improve warp yarn quality, then warp yarn quality is maintained, but weaving efficiency decreases excessively
Solution Approach 1:
The patent employs dynamic adjustment of the spindle rotational speed based on real-time detection of reed vibration amplitude. Instead of maintaining a fixed low speed to ensure warp yarn quality, the system dynamically optimizes the rotational speed within acceptable vibration limits, allowing the loom to operate at higher speeds when vibration is low and reduce speed only when necessary. This dynamic approach resolves the contradiction between manufacturing precision and productivity.
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 enables accurate determination and adjustment of reed vibration amplitude within the weaving width, optimizing weaving efficiency and maintaining warp yarn quality by correlating detected signal waveforms with spindle speed, thereby preventing quality degradation.
Implementation Method 1
the sensor for determining the amplitude of the reed vibration is a reflection optical sensor that is insertable into a shed between warp yarns and retractable from the shed between the warp yarns
Data Source
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AI summary
A method of determining amplitude of reed vibration for an air jet loom (10), wherein the air jet loom (10) determines the amplitude of the reed vibration that is vibration of a reed (14) based on detected signals (V1, V2, V3, V4) detected by a sensor (15) for determining the amplitude of the reed vibration, is characterized by disposing the sensor (15) within a weaving width (B) in a direction of weft insertion, wherein the sensor (15) is a reflection optical sensor (15) that is insertable into a shed between warp yarns (T) and retractable from the shed and determining the amplitude of the reed vibration within the weaving width (B) based on amplitude of a signal waveform (S1, S2) contained in the detected signal (V2) detected during a period when no weft yarn (Y) is present in a weft passage (48) among the detected signals (V1, V2, V3, V4) detected by the sensor (15).