Selvedge Forming Device With Moveable Arm Separator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing selvedge forming devices result in a thicker fabric border due to the tucking of thread ends from both the last and previous weft threads, making it difficult to wind up thicker fabrics efficiently.
Innovation Solution
A selvedge forming device with a moveable arm and separator element that selectively moves thread ends out of the working area of the tucking device, preventing them from being tucked into a subsequent shed, thus maintaining a consistent fabric thickness by only tucking a defined number of weft threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thread ends from both the last inserted weft thread and the previous weft thread are tucked into a subsequent shed, then the selvedge is formed securely, but the fabric border becomes thicker
Solution Approach 1:
The patent divides the weft threads into two groups: a first group of inserted weft threads whose thread ends are tucked into the subsequent shed, and a second group of inserted weft threads whose thread ends are not tucked. This segmentation allows selective treatment of different thread ends, preventing the accumulation of multiple layers at the selvedge edge and thus reducing fabric thickness while maintaining selvedge formation for the first group.
Solution Approach 2:
The patent applies different treatments to different locations along the selvedge edge. Specifically, thread ends of the first group of inserted weft threads are tucked into the subsequent shed to ensure secure selvedge formation, while thread ends of the second group are left untucked to prevent excessive thickness. This local differentiation resolves the contradiction between secure selvedge formation and acceptable fabric thickness.
2Reliability
If all thread ends are tucked into a subsequent shed, then the selvedge is secure, but winding up thicker fabric becomes difficult
Solution Approach 1:
The patent segments the inserted weft threads into a first group and a second group, applying different tucking treatments to each. By not tucking the thread ends of the second group, the fabric thickness at the selvedge is reduced, making the fabric easier to wind up while the first group's thread ends provide sufficient selvedge security.
Solution Approach 2:
Different operations are applied to different portions of the weft threads based on their insertion timing. The first group receives the tucking operation to ensure selvedge security, while the second group is excluded from tucking to facilitate easy winding. This localized quality approach balances selvedge security with operational ease.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Weaving machine, device and method for tucking a thread end (11, 12, 24, 25) of a weft thread (10) into a subsequent shed (15), which thread end (11, 12,24,25) extends outside a shed (15), wherein thread ends (11, 12, 24, 25) are tucked into a subsequent shed (15) by means of a tucking device (13, 14,28,29), wherein a thread end (11, 12, 24, 25) is selectively moved by means of a moveable arm (9, 19), and wherein the thread end (11, 12,24,25) moved by the moveable arm (9, 19) beyond the separator element (8, 18) is separated by the separator element (8, 18) from the working area of the tucking device (13, 14, 28, 29).