Textiles: spinning – twisting – and twining – Apparatus and processes – Covering or wrapping
Reexamination Certificate
2000-10-11
2002-04-16
Falik, Andy (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Covering or wrapping
C057S005000, C057S012000, C057S017000, C057S350000, C057S908000
Reexamination Certificate
active
06370858
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of producing core yarn resembling true twist spun yarn and an apparatus that employs such a method. In this method, vortex air currents ejected from spinning nozzles embedded in a nozzle block are applied to a drafted fiber bundle fed to the entrance of a hollow guide shaft. This results in the fibers of the fiber bundle turning inversely. These inversely turned fibers wrap the fiber bundle while it is being fed into the hollow guide shaft.
BACKGROUND OF THE INVENTION
The Japanese Patent Publication No. 2713089 discloses a core yarn production method using true twist spinning. In this method, a drafted fiber bundle and a core fiber are supplied to a nozzle block and to a hollow guide shaft. The fiber bundle receives vortex air currents generated by spinning nozzles embedded in the nozzle block, and wraps helically around the core fiber. This method allows true twist spinning to produce core yarn. The core fiber of the core yarn produced with this spinning method is not exposed and the core yarn is resistant to abrasion.
In this method, however, the core fiber is supplied directly to the nozzle block downstream of a front roller in a drafting device. This fluctuates the tension of the core fiber, and the position of the core fiber in the core yarn becomes unstable. As a result, the fiber bundle does not uniformly wrap the core fiber and the quality of the core yarn is not always uniform. In other words, the problem is that when the core fiber is supplied directly to a spinning zone, the tension and the position of the core fiber are unstable. As a result, the core fiber may not always be unexposed or may not be very resistant to abrasion.
In addition, when core yarn is produced in a true twist spinning method, it is desired that the core yarn should have elasticity. Ordinary filament yarn used as core fiber does not have much elasticity.
It is thus an object of the present invention to provide a method to allow even wrapping of a fiber bundle around core fiber, to improve uniformity of the quality, and also to improve elasticity of the core yarn in a true twist spinning method where a drafted fiber bundle and core fiber are supplied to a nozzle block and a hollow guide shaft.
SUMMARY OF THE INVENTION
In a first aspect of the present invention, in a spinning method in which a drafted fiber bundle is supplied to a nozzle block and then to a hollow guide shaft, and in which vortex air currents ejected from spinning nozzles of the nozzle block to an area adjacent to the upper tip of the hollow guide shaft allow inversely turned fibers to wrap the fiber bundle that is being fed into the hollow guide shaft, a core fiber is supplied upstream of a front roller of a drafting device. Both of the core yarn and the drafted fiber bundle can be fed together to the nozzle block and then to the hollow guide shaft. The vortex air currents allow the inversely turned fibers to wrap around the core fiber and the fiber bundle to create core yarn.
In a second aspect of the present invention, the core fiber is multi-filament. The vortex air currents balloon the multiple filaments, resulting in each filament separated. The vortex air currents also serve to insert the front ends of the fibers into the clearances between the separated filaments, letting the other ends of the fibers wrapping around the multi-filament core fiber, thus resulting in the creation of the core yarn.
In a third aspect of the present invention, the core fiber is elastic.
In a fourth aspect of the present invention, nozzles that eject high-pressure air are embedded along a yarn path to eject high-pressure air, resulting in the suction of the core fiber into the hollow guide shaft.
In a fifth aspect of the present invention, in a spinning apparatus provided with a hollow guide shaft in which a yarn path is embedded and with a nozzle block containing spinning nozzles that eject vortex air currents to an a area adjacent to the entrance of the hollow guide shaft, a core fiber is fed upstream of a front roller through a core fiber supplying device, and then a fiber bundle and the core fiber are guided to the nozzle block and the hollow guide shaft. In an area adjacent to the entrance of the hollow guide shaft, fibers that make up the fiber bundle wrap around the core fiber to create core yarn.
In a sixth aspect of the present invention, the core fiber supplying device is provided with a delivery roller that rotates positively while contacting an elastic yarn package, and designed to be an elastic yarn supplying device.
In a seventh aspect of the present invention, the nozzles to eject high-pressure air are embedded along the yarn path.
REFERENCES:
patent: 3822543 (1974-07-01), Edagawa et al.
patent: 4450675 (1984-05-01), Petrov et al.
patent: 5568719 (1996-10-01), Proctor
patent: 6240716 (2001-06-01), Yanagawase et al.
patent: 02-713089 (1997-10-01), None
Falik Andy
Murata Kikai Kabushiki Kaisha
LandOfFree
Core yarn production method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Core yarn production method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Core yarn production method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2877137