Thread Feed Device Third Deflection Roller Constant Angle
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Solution Overview
Problem
Existing twisting and cabling machines face issues with inconsistent thread angle of inclination into the traversing thread guide due to pendulum movements of the nodding lever, leading to variations in thread winding quality and requiring complex pitch lever pivoting for bobbin exchange, which complicates the loading process and can result in incorrect positioning.
Innovation Solution
A thread feeding device with an additional third deflection roller arranged downstream of the second deflection roller and upstream of the traversing thread guide, ensuring a constant thread angle of inclination and eliminating the need for pitch lever pivoting during bobbin exchange, thus simplifying the loading process and maintaining consistent thread tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the nodding lever is positioned in front of the yarn feed device with pendulum movements for length compensation, then the thread transport function is achieved, but the angle of inclination of the thread entering the traversing yarn guide varies, resulting in different states at the run-up point and requiring complex pitch lever pivoting for bobbin exchange
Solution Approach 1:
A stationary third deflection roller is introduced as an intermediary element between the nodding lever and the traversing yarn guide. This mediator receives the thread from the movable second deflection roller and redirects it at a constant angle to the traversing yarn guide, thereby decoupling the pendulum movement of the nodding lever from the thread entry angle into the guide. This resolves the contradiction by allowing the nodding lever to move for length compensation while maintaining consistent thread angle through the stationary intermediary roller.
Solution Approach 2:
The thread path is extended by adding the third deflection roller, creating an additional dimensional element in the thread routing. This extra deflection point allows the system to accommodate the vertical pendulum movement of the nodding lever while maintaining a constant horizontal entry angle into the traversing yarn guide, effectively separating the two movement dimensions.
2Productivity
If the nodding lever is positioned in front of the yarn feed device, then thread transport with length compensation is achieved, but the free space around the yarn feed device is reduced, complicating the loading process
Solution Approach 1:
Instead of positioning the nodding lever in front of the yarn feed device as in the prior art, the invention inverts the arrangement by positioning the nodding lever behind the yarn feed device. This spatial inversion creates sufficient free space around the yarn feed device for easy bobbin exchange while maintaining the thread transport function through the reconfigured path involving the first, second, and third deflection rollers.
3Ease of operation
If the pitch lever is pivoted to the side for bobbin exchange, then access to the yarn feed device is improved, but the pitch lever may not be fully pivoted back to its predetermined place, introducing positioning errors
Solution Approach 1:
The function of the pitch lever for bobbin exchange is extracted and separated from the thread guiding function. By positioning the nodding lever behind the yarn feed device and using the stationary third deflection roller, the system eliminates the need for pitch lever pivoting during bobbin exchange. The pitch lever remains in its predetermined position, ensuring consistent thread guiding while allowing easy bobbin access, thus resolving the contradiction between accessibility and positioning accuracy.
Data Source
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AI summary
The invention relates to a thread delivery device 10 for a twisting or cabling machine 1, for feeding a thread via a changing thread guide 14 to a feed spool 16, comprising a first deflecting roller 17 for deflecting a thread, a driven galette 18 downstream of the first deflecting roller 17 in the thread transport direction, a laying roller 19 arranged to the galette 18 in such a way that a thread can be laid several times around the laying roller 19 and the galette 18, encircling them together, and a tilting lever 11 with a second deflecting roller 20 downstream of the galette 18 in the thread transport direction for further deflection of the thread.According to the invention, a boom 22 is arranged with a third deflection roller 21, which is arranged downstream of the second deflection roller 20 in the thread transport direction and upstream of the changing thread guide 14 for feeding the thread onto a take-up spool 16, wherein the second deflection roller 20 is arranged on a different side of a vertical plane running through the axis of rotation of the laying roller 19 than the third deflection roller 21 for receiving the thread from the laying roller 19 or the galette 18 and for deflecting the thread in the direction of the third deflection roller 21.