Movable Thread-Guide Bar for Warp Knitting Machine Threading
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Solution Overview
Problem
The existing threading mechanisms for warp linear knitting machines, such as Raschel-type warp looms, are inefficient and pose safety risks due to the need for manual threading of numerous thread-guides in a narrow space, leading to increased time, costs, and potential damage to the machine and fabric, with previous solutions complicating the machine's structure and accuracy.
Innovation Solution
A device with movable supports and an oscillating shaft allows thread-guides to be rotated out of the knitting area for easier access, enabling safe and efficient threading without dismounting bars, using blocking and movement mechanisms to switch between operating and threading positions, thus improving accessibility and reducing operator discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual threading of numerous thread-guides is performed in narrow space, then threading operation can be completed, but time consumption increases and operator safety is compromised
Solution Approach 1:
The thread-guide bar is made movable between a working position during knitting and a threading position during operation. The bar can be lifted and rotated to bring thread-guides from the inner bars into accessible positions, eliminating the need for manual threading in narrow spaces and significantly reducing threading time without compromising safety
2Ease of operation
If outer bars are dismounted to access inner thread-guides, then threading accessibility is improved, but machine assembly time and complexity increase
Solution Approach 1:
Instead of dismounting bars, the invention makes the thread-guide bar itself movable. The bar can be lifted and rotated to position thread-guides for easy access, maintaining bar integrity while providing threading accessibility. This eliminates the complex operations of dismounting and re-mounting bars
3Ease of operation
If lifting mechanisms are added to raise thread-guide bars, then threading accessibility is improved, but machine size and bulkiness increase
Solution Approach 1:
The invention uses a simple lifting mechanism that raises only the necessary portion of the thread-guide bar rather than the entire bar assembly. This selective lifting approach provides adequate accessibility for threading while minimizing the added bulk and complexity of lifting mechanisms
4Ease of operation
If thread-guides are accessed in parallel position with needles, then threading can be performed, but operator position becomes uncomfortable and unsafe
Solution Approach 1:
The thread-guide bar is rotated to a threading position that is angularly displaced from the parallel position with needles. This rotation brings thread-guides into a safe and comfortable working position for operators, eliminating the need to bend or work in dangerous positions while maintaining threading capability
Data Source
AI summary
A device (1) for improving the threading of thread-guides (5) for warp linear knitting machines (10), comprising at least a first support (6) that is associated or coupled to a supporting structure (11) of a warp linear knitting machine (10), a second support (7) operatively placed between the first support (6) and the supporting structure (11), a plurality of thread-guides (5) designed to guide threads while knitting a knitted item, and at least one thread-guide (5) bar (2) operatively associated or coupled to the first support (6) to which the thread-guides (5) are associated or coupled. The first (6) and the second (7) support are movable with respect to the supporting structure (11) between an operating position, in which the thread-guides (5) are active for the formation of the knitting item, and at least one threading position, angularly rotated with respect to the operating position, in which the threading of the thread-guides (5) takes place.