Optical Yarn Bobbin Change Detection Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing devices for sensing yarn bobbin changes in textile machines struggle to reliably detect the head-tail event due to high yarn speeds and require complex yarn braking gripper repositioning, which can lead to false readings and yarn breakage.
Innovation Solution
A device with two separate sensing zones and optical sensors positioned to detect yarn presence, using a control unit to generate signals based on light emission and reception, allowing precise identification of yarn origin change without altering yarn processing conditions or imposing additional tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If yarn braking grippers are used to maintain the connection portion within the sensitive zone, then the bobbin change detection reliability is improved, but the device complexity and installation difficulty increase due to the need for frequent repositioning
Solution Approach 1:
The invention removes the yarn braking grippers from the sensing device, extracting the problematic component that caused frequent repositioning needs. The connection portion is no longer actively held within the sensitive zone but instead allowed to move naturally, eliminating the complexity of gripper repositioning mechanisms while maintaining detection capability through the optical sensor system.
Solution Approach 2:
The mechanical yarn braking grippers are replaced with an optical sensing system using light emitters and receivers. This substitution eliminates the need for mechanical intervention to maintain the connection portion position, as the optical sensors can detect the head-tail event through light transmission changes without requiring physical contact or active holding of the yarn connection.
2Reliability
If yarn braking grippers are used to hold the connection portion, then false readings are reduced, but yarn breakage risk increases due to the braking action that must be counteracted at the head-tail event
Solution Approach 1:
The mechanical braking action of the yarn gripping devices is completely replaced by an optical detection system. Light emitters and receivers detect the passage of the connection portion through changes in light transmission, eliminating any mechanical force applied to the yarn that could cause breakage during the head-tail event.
Solution Approach 2:
Light serves as an intermediary medium to detect the connection portion passage without physically contacting or exerting force on the yarn. The optical sensors detect changes in light transmission caused by the connection portion's physical properties, allowing accurate detection without applying any braking or holding forces that could lead to yarn breakage.
3Device complexity
If a single sensing zone is used to detect the head-tail event, then the device simplicity is maintained, but the detection reliability decreases at high yarn speeds due to the instantaneous nature of the event
Solution Approach 1:
The sensing system is divided into multiple optical sensors positioned at different locations along the yarn path. Each sensor detects light transmission at its specific position, and the control unit processes signals from multiple sensors to identify the head-tail event. This segmentation allows the system to capture the instantaneous event through multiple detection points, improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The detection approach transitions from a single-point temporal detection to a distributed spatial detection system. Multiple optical sensors are arranged along the yarn path, creating a spatial dimension of detection that allows the system to track the connection portion's movement through space. This dimensional expansion enables reliable detection of the instantaneous head-tail event by capturing it across multiple spatial positions rather than relying on a single sensing point.
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
Enables secure and reliable detection of yarn bobbin changes, independent of yarn speed, without risking yarn breakage and simplifying installation, ensuring continuous yarn feed with precise tracking of bobbin changes.
Implementation Method 1
using a control unit to generate signals based on light emission and reception
Data Source
Figure 1~2
Figure 3~6
Figure 4
AI summary
A device for sensing the change of feed bobbin for a yarn fed to a textile machine and originating from a first bobbin (B1) or a second bobbin (B2) connected together in head-tail manner comprises at least one first sensor (8) and one second sensor (9) at a passage section (7) of a support body (2), a control unit (10) associated with said first sensor (8) and second sensor (9), said first sensor (8) and said second sensor (9) generating first and second presence signals when the yarn unwound from the first bobbin (B1) or from the second bobbin (B2) passes in front of said first sensor (8) or second sensor (9), said control unit (10) receiving as input said first and/or second presence signal to generate at least one output signal representative of the first bobbin (B1) or of the second bobbin (B2) on the basis of said first or second presence signal.