Yarn end retrieving device and operating cart mounting the same

Details Yarn end retrieving device and operating cart mounting the same Yarn end retrieving device and operating cart mounting the same

1999-04-21

2001-08-14

Calvert, John J. (Department: 3741)

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

C057S087000, C057S262000, C028S294000

Reexamination Certificate

active

06272831

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a yarn end retrieving device, and in particular to a retrieving device employed when retrieving a yarn end on a package or bobbin.
BACKGROUND OF THE INVENTION
Conventionally, a suction mouth has been known as a yarn end finding device that retrieves a yarn end on a package or bobbin (hereinafter referred to as a “package”) (Japanese Unexamined Patent Application Publication (Tokkai-Hei) No. 8-245081). This device uses air suction to retrieve the yarn end, and it brings a suction orifice into close proximity to the yarn layer surface of the package while air is sucked in from the suction orifice at the end of the suction mouth.
In order to retrieve the yarn end using only air suction, however, a comparatively high-capacity compressor must be employed. Additionally, it is necessary to generate strong suction force and enable the suction orifice to be positioned as close as possible to the yarn layer surface in order to prevent suction failures. However, as the suction orifice becomes more proximal to the yarn layer surface, the suction force increases. Thus, it has been difficult to hold the suction mouth at a constant position against the suction force. If the suction orifice adheres to the yarn layer surface, it becomes impossible to retrieve the yarn end.
It is thus an object of the present invention to solve these problems by providing a yarn end retrieving device which is able to easily retrieve a yarn end using a low-capacity compressor.
SUMMARY OF THE INVENTION
In order to accomplish this object, a yarn end retrieving device which retrieves a yarn end by generating an airflow of compressed air along a predetermined guiding surface, and directing the airflow against a yarn layer surface.
Thus, a high-speed airflow from the compressed air and an accompanying airflow which is generated from air pulled along with the high-speed airflow causes the yarn end to be lifted off the yarn layer surface, and an airflow which uses the Coanda effect along the guiding surface guides and retrieves the yarn end.
The guiding surface may be comprised of a flat surface section and a curved surface section.
It is preferable that a pair of guiding surfaces be provided and that the curved surface sections are arranged so as to face each other so as to form an interstice of a predetermined distance, and such that the air currents are blown in opposing directions from each of the flat surface sections towards each of the curved surface sections.


REFERENCES:
patent: 3664109 (1972-05-01), Escursell-Prat
patent: 4478035 (1984-10-01), Pons
patent: 5005348 (1991-04-01), Stahlecker
patent: 5687461 (1997-11-01), Kohlen
patent: 8-245081 (1996-09-01), None

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