Open-end spinning device

Details Open-end spinning device Open-end spinning device

1986-06-30

1987-10-06

Watkins, Donald

Textiles: spinning, twisting, and twining

Apparatus and processes

Open end spinning

57408, D01H 7892, D01H 7882, D01H 1135

Patent

active

046974113

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

The invention concerns an open-end spinning device with two friction rollers driven in the same direction and forming a spinning notch, in which at least the friction roller rotating towards the spinning notch is a suction roller for, feeding the fiber material brought onto its casing surface into the spinning notch where the fibers are twisted together into a thread.
Prior art discloses a device in which the fibers are pulled from an unravelling device, are blowin by an air stream onto the casing of a suction roller and are fed by said suction roller into the spinning notch formed by the suction roller and by another roller with a closed casing surface, driven in the same direction of rotation as the suction roller (DE-OS No. 1,902,111=U.S. Pat. No. 3,636,963). The fibers are twisted by friction into a yarn in the spinning notch, said yarn being drawn off continuously. However, the quality of the yarn produced on this device is unsatisfactory, especially at high spinning speeds.
In another known open-end friction spinning device the unravelled fibers are fed onto the casing surface of the suction roller by means of a feeding channel, the outlet of which lies in the peripheral sense of the suction roller, facing the casing surface of the suction roller, separated by a space from the wedge-shaped slot or spinning notch (DE-OS No. 3 300 636). The edge of the feeding channel outlet is designed as a deflection guide which is to accelerate and stretch the fibers as they emerge from the feeding channel. This device however, did not yield the expected results.
It is the objective of the present invention to create a device which makes it possible to produce yarn of greater uniformity and better suitability for high-speed production.
This objective is attained by the invention with a device as described in the introductory clause of claim 1 by providing, separated by a space from the spinning notch, a collecting groove for the arriving fiber material, said collecting groove being formed by the casing surface of the friction roller rotating towards the spinning notch and by a moving guiding surface having a surface speed, in the collecting groove, that is synchronized with the surface speed of the friction roller.
By depositing the fibers in a collecting groove formed by two moving surfaces, an exact and defined collection and gathering of the fiber material is achieved. The fed fibers are pre-doubled and are conveyed to the spinning notch in a very uniform formation. This influences the quality of the yarn favorably.
The collecting groove is formed in a simple manner by a roller in close proximity of the friction roller. A variant of the device provides for the guiding surface, at the bottom of the collecting groove, to be supported on the surface of the friction roller. In order to give the fibers additional guidance as they emerge from the collecting groove, the guiding surface follows the surface of the friction roller into the spinning notch. This is achieved by constituting the guiding surface as the surface of an endelss band. The guiding surface is suitably pressed against the casing surface of the friction roller. In another advantageous variant, the moving guiding surface is follwed by a fixed guiding surface. The fixed guiding surface, in this instance, extends suitably into the spinning gusset.
By providing for a space between the fixed guiding surface and the moving guiding surface, an air current is created in direction of the friction roller, holding the fibers on the friction roller. This air current can be reinforced by providing the fixed guiding surface with perforations leading to the atmosphere. In order to prevent the fibers from builidng up or frombeing brushed off the friction roller as they pass from the moving to the fixed guiding surface, the edge of the fixed guiding surface facing the moving guiding surface is rounded off.
Trouble-free conveying of the fibers to the spinning notch is ensured by providing a space between the fixed guiding surface

REFERENCES:
patent: 3132465 (1964-05-01), Putnam
patent: 3636693 (1972-01-01), Benson et al.
patent: 4168601 (1979-09-01), Didek et al.
patent: 4348859 (1982-09-01), Olsson
patent: 4522023 (1985-01-01), Stahlecker
patent: 4545194 (1985-10-01), Juillard
patent: 4557105 (1985-12-01), Brockmanns et al.
patent: 4573312 (1986-03-01), Brockmanns et al.

Affiliated with

Also associated with

Rating

Open-end spinning device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Open-end spinning device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Open-end spinning device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2110612