Yarn Breakage Sensor Guide Reduces Dust Adherence
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Solution Overview
Problem
Existing yarn breakage sensors in creel devices suffer from yarn vibration-induced dust adherence on light emitter/receiver surfaces, leading to erroneous breakage detection due to insufficient light reception.
Innovation Solution
Incorporating a yarn guide with restraining surfaces on both sides of the yarn movement path, where the distance between these surfaces is less than or equal to half the distance between the facing surfaces, to minimize yarn vibration and dust adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light emitter and light receiver are exposed at facing surfaces to detect yarn movement, then yarn breakage detection capability is improved, but yarn vibration causes dust to adhere to the light surfaces leading to erroneous detection
Solution Approach 1:
The patent introduces a transparent cover as an intermediary element that protects the light emitter and light receiver from direct exposure to yarn vibration and dust. The cover allows light to pass through while preventing dust particles from adhering to the light surfaces, thus resolving the contradiction between detection accuracy and dust contamination.
Solution Approach 2:
The patent applies preliminary protective measures by positioning the light emitter and light receiver within a protected structure before dust can adhere to them. The facing surfaces are designed with a configuration that prevents dust accumulation in advance, ensuring consistent light reception throughout operation.
2Ease of manufacture
If the light emitter and light receiver are exposed at the facing surfaces, then the structure is simplified and ease of manufacture is improved, but the light surfaces become vulnerable to dust adherence
Solution Approach 1:
The transparent cover serves as a protective intermediary that maintains the simple exposed structure for light emission and reception while simultaneously protecting against dust. This allows the manufacturer to keep the assembly simple yet achieve reliable dust-free operation.
3Object-affected harmful factors
If the distance between facing surfaces is reduced to minimize yarn vibration, then dust adherence is reduced, but the yarn movement path becomes more constrained
Solution Approach 1:
The patent resolves the spatial constraint by introducing a protective dimension - the transparent cover extends in the direction perpendicular to the light path, providing dust protection without reducing the vertical distance between facing surfaces. This allows the yarn movement path to remain sufficiently wide while preventing dust accumulation.
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
The yarn guide effectively reduces yarn vibration and dust adherence, enhancing the accuracy of yarn breakage detection by ensuring consistent light reception.
Implementation Method 1
a light emitter that is exposed at one of the pair of facing surfaces and a light receiver that is exposed at the other of the pair of facing surfaces and that faces the light emitter
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
To suppress adherence of dust to a light emitting surface of a light emitter (35a) and a light receiving surface of a light receiver (35b) of a yarn breakage sensor (30, 30') for a creel device (10) and prevent erroneous detection of yarn breakage, the yarn breakage sensor (30, 30') being provided for each yarn supply package (P) so that a yarn (T) that is pulled out from the yarn supply package (P) moves through a yarn movement path that is defined by a pair of facing surfaces (33a) that face each other in an up-down direction, and the yarn breakage sensor (30, 30') including the light emitter (35a) disposed in such a way that a light emission surface thereof is exposed at one of the pair of facing surfaces (33a) and the light receiver (35b) disposed in such a way that a light receiving surface thereof is exposed at the other of the pair of facing surfaces (33a) and that faces the light emitter (35a). The yarn breakage sensor (30, 30') includes a yarn guide (37, 38, 39) that is disposed at least on an upstream side, which is one of the upstream side and a downstream side, of the yarn movement path with respect to a path of the yarn (T) in which the yarn supply package (P) is on a most upstream side, the yarn guide (37, 38, 39) having a pair of restraining surfaces that face each other in the up-down direction. The distance (d) between the pair of restraining surfaces is smaller than or equal to 1/2 of the distance (D) between the pair of facing surfaces (33a).