Yarn Winding Bobbin Holder Layout to Prevent Doffing Entanglement
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Solution Overview
Problem
Existing yarn winding devices face issues with yarn detachment during doffing, leading to entanglement with bobbins, which is difficult to manage manually and unreliable with electric heating wires.
Innovation Solution
A yarn winding device with a yarn entering preventing member that includes a yarn contact portion extending in an intersecting direction, positioned to intercept and guide detached yarn away from the bobbin holder at the winding position, preventing entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the package supporting shaft is raised to a predetermined height during doffing, then the doffing operation is completed successfully and packages are removed from the bobbin holder, but detached yarn may be pulled upward and entangled with bobbins at the winding position
Solution Approach 1:
A yarn guide member is introduced as an intermediary component between the doffing device and the winding position. This member includes a yarn contact portion that intercepts detached yarn and guides it along a safe path, preventing the yarn from being pulled into the winding area while allowing the package supporting shaft to be raised for doffing operations
Solution Approach 2:
The harmful effect of yarn entanglement is extracted and isolated by directing detached yarn through a dedicated guidance path. The yarn contact portion separates the yarn flow from the problematic area, extracting the entanglement risk from the doffing operation
2Ease of operation
If manual cutting of caught yarn is performed, then yarn entanglement can be resolved, but the operation is difficult to manage and time-consuming
Solution Approach 1:
The yarn guide member performs preliminary action by intercepting and guiding detached yarn before it can become entangled with bobbins. This preventive measure eliminates the need for subsequent manual cutting and resolution of entanglement, saving time and improving operational ease
3Extent of automation
If electric heating wires are used to cut yarn, then automated cutting is achieved, but the method is unreliable and may not effectively cut the yarn
Solution Approach 1:
The unreliable electric heating wire cutting method is replaced with a mechanical guidance system. The yarn guide member uses mechanical contact and physical guidance to control yarn movement, providing a more reliable and predictable solution than thermal cutting methods
Data Source
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AI summary
A yarn winding device 1 includes: two bobbin holders 5 to which a plurality of bobbins B is attached, the two bobbin holders 5 being configured to be switchable between a winding position A1 at which a yarn Y is wound around each of the bobbins B to form a plurality of packages P and a standby position A2 below the winding position A1; a pushing member 21 configured to be movable in a front-rear direction and configured to push out the plurality of packages P from a front end portion of the bobbin holder 5 at the standby position A2 by moving from a rear side to a front side in the front-rear direction; and a yarn entering preventing member 10 capable of blocking the yarn Y from entering the plurality of bobbins B attached to the bobbin holder 5 at the winding position A1. The yarn entering preventing member 10 includes the yarn contact portion 31 that extends in the left-right direction and with which the yarn Y can make contact from a lower side. The yarn contact portion 31 is located on the front side in the front-rear direction of the bobbin holder 5 at the standby position A2, is located above the bobbin holder 5 at the standby position A2, and is located on the lower side than the bobbin holder 5 at the winding position A1.