Yarn Feeder Guide Structure for Simple, Low-Snag Threading
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Solution Overview
Problem
Existing yarn feeding devices suffer from complex threading processes and a high risk of thread snagging due to lateral threading openings and open guide elements, especially at low thread tension.
Innovation Solution
A yarn feeding device with two yarn guide elements, a take-off element and an outlet element, featuring lateral threading openings on opposite sides and a rotatable outlet sensor, allowing for easy one-handed threading and secure thread guidance using ceramic-coated guide sections and a spring-activated slide mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lateral threading openings and open guide elements are used, then threading is simplified, but the risk of thread snagging increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning the thread guide elements and lateral threading openings in a controlled manner before the threading operation. The guide elements are arranged to automatically guide the thread through the lateral openings, ensuring proper alignment and reducing the chance of snagging during the threading process.
Solution Approach 2:
The patent introduces an intermediary element in the form of a ceramic-coated thread guide section that acts as a mediator between the thread and the metal components. This ceramic coating reduces friction and prevents the thread from catching on sharp edges or rough surfaces, thereby maintaining threading simplicity while reducing snagging risk.
2Ease of operation
If the threading openings are positioned close to the thread path, then threading access is improved, but the risk of thread snagging increases
Solution Approach 1:
The patent applies local quality by providing different surface characteristics at different locations. The thread guide section has a ceramic coating with low friction properties where the thread contacts, while the lateral threading openings are positioned to provide good access. This localized differentiation allows accessible threading openings while protecting the thread path from snagging through the specialized coating.
3Strength
If metal components are used for thread guide elements, then structural strength is improved, but friction and thread snagging increase
Solution Approach 1:
The patent employs composite materials by combining metal structural components with a ceramic coating. The metal provides the necessary structural strength and durability, while the ceramic coating layer reduces friction and prevents thread snagging. This composite approach allows the thread guide elements to maintain their mechanical integrity while improving thread flow characteristics.
Data Source
Figure 1~2
Figure 3a~5b
AI summary
A yarn feeder (1) for supplying a yarn (F) to a textile machine is equipped with a support unit (2), a yarn feeder wheel (4), and two yarn guide elements arranged one behind the other and behind the yarn feeder wheel (4) in the yarn path on the support unit (2). The yarn feeder (1) has at least one exit sensor (22) which is rotatably mounted on the support unit (2) and, during operation, is held in an operating position between the two yarn guide elements by the yarn (F). The two yarn guide elements are designed as a take-up element (20) and a discharge element (21), each having an elongated element with a lateral entry eyelet (32, 42). Each of the elongated elements of the take-up element (20) and the discharge element (21) is subdivided in its lower section into two legs (30, 31; 40, 41). The lateral threading opening (32, 42) is formed between the legs (30, 31; 40, 41).The two legs (30, 31; 40, 41) are connected at their lower ends and form a thread guide section (33, 43). The lateral threading opening (32) of the take-off element (20) is located on one side of the thread path and the threading opening (42) of the exit element (21) is located on the other side.