Yarn Threading Apparatus Prevents Straight Winding
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Solution Overview
Problem
The existing yarn threading apparatuses often result in straight winding on bobbins, which obstructs the unwinding of yarn from packages due to the yarn being wound multiple times at the center, leading to issues with yarn tension and increased risk of breakage during the winding process.
Innovation Solution
A yarn threading apparatus with a yarn holding member, yarn hooking portion, yarn threading member, traverse guide, and control unit that disengages the yarn from the engagement portion at the center, guiding it to a bunch winding position outside the traversal range, and then catches it with the traverse guide to prevent straight winding, utilizing a motor-driven traverse guide for precise control and a guide portion to ensure reliable disengagement and holding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the yarn engagement portion rotates to pass through the center of the traversal range and the yarn is disengaged at around the center, then the yarn threading process is simplified, but straight winding is formed on the bobbin which obstructs yarn unwinding
Solution Approach 1:
The invention extracts the yarn from the center traversal path and redirects it to a bunch winding position located outside the traversal range. This is achieved by positioning the yarn engagement portion and bunch guide such that the yarn is delivered to an end portion region of the bobbin rather than passing through the center, thereby preventing straight winding while maintaining threading efficiency
Solution Approach 2:
The bunch guide acts as an intermediary component that receives the yarn from the yarn engagement portion and redirects it to the bunch winding position outside the traversal range. This mediator ensures the yarn follows the desired path to avoid straight winding formation
2Productivity
If the yarn is wound multiple times at the center of the bobbin, then the threading process is efficient, but yarn tension increases and breakage risk increases
Solution Approach 1:
The invention removes the harmful multiple winding at center effect by extracting the yarn from the center traversal path and redirecting it to the bunch winding position at the end portion of the bobbin. This eliminates the repeated winding loops that cause excessive tension and yarn breakage
Solution Approach 2:
The invention applies different winding patterns to different regions of the bobbin: bunch winding at the end portion (outside traversal range) and regular traversal winding in the main body. This local differentiation ensures efficient threading in the main body while preventing harmful straight winding at the center
Data Source
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AI summary
Formation of straight winding on a bobbin is prevented when yarn threading onto the bobbin is performed. A yarn threading apparatus 60 includes: a yarn threading arm 62 having a yarn engagement portion 62a; and a bunch guide 65. A yarn Y is disengaged from the yarn engagement portion 62a on account of yarn threading to a hook 41a, when the yarn threading arm 62 is at a yarn threading position. The bunch guide 65 holds the yarn Y disengaged from the yarn engagement portion 62a to maintain the yarn Y at a bunch winding position x which is outside a traversal range of a bobbin Bw. A control unit 64 causes a traverse guide 72 to move between a predetermined position which and the traversal range r. The bunch guide 65 is structured to cause the yarn Y held thereby to be caught by the traverse guide 72 moving from the predetermined position into the traversal range r and to be detached from the bunch guide 65.