Stitch-Bonding Machine Layout for Homogeneous Weft Integration
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Solution Overview
Problem
Existing stitch-bonding machines experience inhomogeneous fabric quality due to weft threads spreading and uneven gaps caused by the need to deflect weft threads at 90°, leading to positional shifts and collisions with stitch-bonding tools.
Innovation Solution
A stitch-bonding machine with horizontally aligned slide needles and a weft thread laying device positioned above the stitch-bonding station, using circulating weft thread transport chains that run from top to bottom, eliminating the need for thread deflection and ensuring homogeneous integration of weft threads into the fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If weft thread transport chains are deflected at 90° to feed weft threads perpendicular to the needle movement, then the weft threads can be fed in the correct direction for stitch-bonding, but the hook chains spread out causing positional shifts and inhomogeneous gaps between weft threads
Solution Approach 1:
The patent changes the spatial arrangement by positioning the weft thread laying device above the stitch-bonding station instead of behind it. This vertical arrangement allows weft threads to be fed vertically downward onto horizontally moving needles, eliminating the need for 90° deflection and the associated spreading of hook chains. The dimensional change from horizontal-to-vertical feeding resolves the contradiction by maintaining thread spacing homogeneity while achieving correct thread orientation.
Solution Approach 2:
Instead of deflecting the weft thread transport chains horizontally at 90° as in conventional machines, the patent inverts the approach by having the laying device positioned above and feeding threads vertically downward. This inversion eliminates the deflection mechanism entirely, preventing hook chain spreading and positional shifts while still achieving the required perpendicular relationship between weft threads and needle movement.
2Manufacturing precision
If weft thread laying device is positioned behind the stitch-bonding station with horizontal transport chains, then the machine structure is conventional, but the weft threads collide with stitch-bonding tools and cause inhomogeneous fabric quality
Solution Approach 1:
The patent repositions the weft thread laying device from a horizontal arrangement behind the stitch-bonding station to a vertical arrangement above it. This dimensional change allows weft threads to be fed vertically downward onto the needle bed, clearing the path of horizontally moving stitch-bonding tools and eliminating collisions that degrade fabric quality and disrupt thread feeding reliability.
3Area of stationary object
If weft threads are fed horizontally from behind the stitch-bonding station, then the transport path is simple, but excessive tensioning is required and installation space is increased
Solution Approach 1:
By positioning the laying device vertically above the stitch-bonding station and feeding weft threads downward, the patent eliminates the need for long horizontal transport paths behind the machine. This vertical arrangement shortens the thread path, reducing installation space requirements and minimizing the tensioning force needed to maintain thread stability during feeding.
Data Source
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AI summary
The present invention relates to a stitch-bonding machine with horizontally aligned slide needles arranged at a stitch-bonding station of the stitch-bonding machine, at least one weft thread laying device for laying at least one weft thread in a weft thread laying area of the stitch-bonding machine, and opposing, circulating weft thread transport chains. The invention further relates to a stitch-bonding method in which, on a stitch-bonding machine, when properly set up for operation, at least one horizontally extending weft thread is produced with a reciprocating weft thread laying device, which is fed to horizontally moving slide needles arranged at a stitch-bonding station of the stitch-bonding machine by means of opposing, circulating weft thread transport chains.In the stitch-bonding machine according to the invention, when properly installed, the weft thread laying device is arranged above the stitch-bonding station, and the weft thread transport chains run from top to bottom throughout the entire weft thread laying area. In the stitch-bonding method according to the invention, the at least one weft thread is continuously fed from above to the stitch-bonding station by the weft thread transport chains.