Splicer Loop Former for Thread Length Control
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Solution Overview
Problem
Existing splicers for winding machines face challenges in setting and retracting thread lengths for splicing, particularly with yarns having non-smooth surfaces, leading to uneven connections due to increased friction and inconsistent thread lengths.
Innovation Solution
A splicer design that combines the functions of setting and retracting thread lengths using a single working element, referred to as a loop former, which forms opening and withdrawal thread loops sequentially, allowing for precise control and reproducibility without additional components or actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate loop pullers are used for upper and lower threads, then thread length consistency is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of upper and lower loop pullers into a single loop former that sequentially forms loops on both threads. This single component performs the work of what would traditionally require separate loop pullers and multiple actuators, reducing device complexity while maintaining the ability to control thread lengths consistently for splicing operations
Solution Approach 2:
The loop former is designed as a universal component that can form loops on both the upper and lower threads through sequential operation. This multi-functional design eliminates the need for thread-specific loop pullers, reducing the number of components while preserving the precision needed for different yarn types
2Device complexity
If a single loop puller is used for both threads, then device complexity is reduced, but thread length consistency deteriorates
Solution Approach 1:
The loop former employs dynamic sequential positioning to form loops on upper and lower threads at different times and positions. By moving the single loop former to appropriate locations and timing its loop-forming action for each thread separately, the system maintains thread length consistency despite using only one loop-forming component
Solution Approach 2:
The loop former operates periodically, first forming a loop on one thread, then moving to form a loop on the other thread in sequence. This periodic, alternating action allows a single component to achieve the differential control that would otherwise require simultaneous independent loop pullers on both threads
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
This design simplifies the splicing process, reduces component complexity, and ensures consistent thread connections across various yarn types by allowing the loop former to act on both threads in succession, avoiding the need for separate loop pullers and actuators, thus enhancing the reproducibility and flexibility of thread length settings.
Implementation Method 1
the upper and lower threads lying next to each other in the splice channel must be drawn up by the suction in the unraveling tubes
Data Source
Figure 1
Figure 2(a)~2(d)
AI summary
The invention relates to a splicer (8) for splicing an upper (4') and lower thread (4"), comprising: - a splice channel (26), - an upper thread clamp (30) and an upper cutting device (32) above and a lower thread clamp (34) and a lower cutting device (36) below the splice channel (26), - an upper and a lower unbundling tube (38) each between the splice channel (26) and the upper (32) and lower (36) cutting devices respectively, - and an upper and a lower loop former (24, 40) each between the splice channel (26) and the upper (32) and lower (36) cutting devices respectively for forming a respective unbundling thread loop (50) in the lower (4") and upper thread (4') before it is cut by the upper (32) and lower (36) cutting devices respectively for adjusting the respective unbundling length of the lower (4") and upper thread (4'). or upper thread (4') in the upper orThe lower dissolving tube (38) is characterized in that the upper and lower loop-forming devices (24, 40) are arranged between the thread paths of the lower (4') and upper thread (4") for the formation of a respective retraction thread loop (51) in the upper (4') and lower thread (4"), respectively, for retracting the respective thread end of the upper (4') and lower thread (4"), which has been dissolving in the lower and upper dissolving tubes (38), into the splice channel (26). The invention also relates to a winding station and a winding machine with such a splicer.