Weaving Loom Dipping Guide Needle and Combing Shaft
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Solution Overview
Problem
Existing weaving looms face challenges in incorporating knitting or cover threads effectively, particularly in maintaining flexibility and ensuring reliable movement of weft-insertion elements due to limitations in guide needle design and reed structure, leading to issues like reduced thread loop size and warp density variations.
Innovation Solution
A weaving loom design featuring a combing shaft with protrusions and a dipping guide needle that is both rotatable and laterally slidable, allowing for the retention and release of knitting threads, enabling the incorporation of multiple threads without altering the fabric structure and enhancing flexibility by using a thread guiding eye to introduce additional threads through weaving rather than warp threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If guide needles are arranged between reed and shed forming device to bring effect threads into lower shed, then effect threads can be incorporated into fabric, but effect thread loops become progressively smaller as shift strokes increase, preventing reliable weft-insertion element movement
Solution Approach 1:
Instead of moving guide needles horizontally to bring threads into the shed (which causes progressively smaller loops), the invention inverts the approach by using a dipping guide needle that moves vertically down into the already-formed shed. This vertical dipping motion maintains consistent loop size throughout the insertion stroke, ensuring reliable weft-insertion element movement while still achieving effect thread incorporation.
Solution Approach 2:
The invention transitions from horizontal guide needle movement (in the plane of the shed) to vertical dipping motion (perpendicular to the shed plane). By introducing this dimensional change, the guide needle can access threads in the lower shed without compromising loop size, as the vertical insertion path maintains constant horizontal distance from the thread loop formation point.
2Ease of operation
If reed is open towards top without upper frame, then easier access for thread insertion, but reed teeth can bend under small forces causing warp density variations
Solution Approach 1:
The invention adds an upper frame to the reed structure beforehand, creating a rigid enclosure that prevents tooth bending before forces are applied during operation. This preventive structural reinforcement ensures warp density consistency is maintained from the outset, while the open top configuration is preserved to allow thread insertion access.
3Reliability
If retaining hook is used to bind down cover threads, then threads are secured onto backing fabric, but device lacks flexibility for multiple additional threads
Solution Approach 1:
The invention replaces the single retaining hook with multiple individual guide needles, each capable of independently handling one or more effect threads. This segmentation allows the device to securely bind down multiple cover threads simultaneously while maintaining the flexibility to adjust the number and position of threads, as each guide needle operates independently.
Data Source
AI summary
In order to provide a weaving loom having incorporated knitting threads, it is provided that the corresponding device for incorporating knitting threads comprises a feeding device for each knitting thread and, also for each knitting thread, a dipping guide needle (4) which comprises a thread guiding eye and which can be dipped between warp threads (2, 3) into the shed all the way below the insertion path of the weft-insertion device (7). Each one of the dipping guide needles (4) is slidingly arranged transversely to the warp direction, thus being able to move across the width of the woven material. Furthermore, there is provided a combing shaft (10) that comprises a plurality of teeth with intermediate spaces arranged therebetween for guiding the knitting threads. The combing shaft (10) that is slidable transversely to the direction of the warp thread and is rotatable around an axis in the direction of the rail is arranged transversely to the direction of the warp thread behind the stop position of the reed. The teeth of the combing shaft comprise protrusions which are designed in such manner that the teeth can retain the knitting threads in at least one rotational position of the combing shaft.