Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1992-11-24
1994-09-06
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
1394354, 1394351, D03D 4730, D03D 4734
Patent
active
053438981
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device designed to facilitate the threading of yarn into a yarn feed system consisting of thread regulator and intake thread brake. The thread regulator is thereby of the type known per se which is preferably equipped with a yarn winding sheave with attached feed tube for the yarn, which sheave is fixed to a centrally located and rotatable shaft. A first duct is made in the said shaft, this first duct being connected to a second duct in the yarn winding part. The intake thread brake has an intake aperture through which yarn enters from a yarn spool or similar yarn supply. Depending on the controls/control signals from one or more control units, one or more ejectors located in or on the said first and second ducts secure(s) the yarn feed in the first and second ducts by ensuring that a medium pressure ratio accomplishing the yarn feed prevails in the first and second ducts. The said controls may control one or more connections from one or more pressure sources to the said ejector/ejectors.
The invention also relates to a process for facilitating the threading of yarn into a yarn feed system consisting of the said intake thread brake and thread regulator where the thread regulator includes first and second ducts, in or onwhich one or more ejectors are positioned in such a way as to ensure that a medium pressure ratio which accomplishes the yarn feed into the thread regulator occurs in the first and second ducts.
BACKGROUND OF THE INVENTION
Accomplishing the yarn feed through a thread regulator by mechanical means with the aid of a preferably flexible needle-shaped element is already known. Accomplishing the threading process by means of ejectors
ozzles in parts of the yarn feed path which extends through various elements in the yarn feed system, is also known. Thus a nozzle or ejector arrangement in the actual thread regulator, by means of which the end of the yarn is introduced via an intake aperture, and the nozzles or ejectors are thereafter acted upon in order to obtain the threading function, is also known.
Making use of the intake thread brake (in relation to the thread regulator) in the yarn feed path and locating the intake brake in connection with the thread regulator is also known. In the known arrangements, a number of transducers are often used which are intended to indicate the positions (presence) of the yarn on its path through the particular elements in the yarn feed system. So-called controlled brakes on the intake side of a thread regulator are also already known. Brakes of this type facilitate variations in the yarn brake parameters and the brake in question often works on the "on-off" principle.
One requirement is to be able to achieve an effective threading function which, for the major part at least, runs automatically. The threading function is therefore to be capable of including yarn control function(s) at the exit from the thread regulator, so that further feeding can be accomplished through any subsequent exit thread brake as far as the textile machine using the thread, especially a loom.
There is also a requirement that the yarn delivery system should be capable of containing as few components as possible and one objective expressly stipulated in certain contexts is that the number of transducers/sensors for detecting the presence (positions) of the yarn should be as small as possible.
A simple and unambiguous handling of the yarn threading function is desirable, particularly in view of the fact that malfunctions can occur when the textile machine/loom is operating, especially breaking of the yarn. One ob3ect of this invention, therefore, is to achieve an entirely automatic threading process, or at least one which is automatic in many sections. Having a yarn cleaning process forwards and/or backwards on the thread path prior to the threading process should achieve the simplified handling and construction desired. Achieving such threading and yarn cleaning processes is a complex technical problem to which the present in
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patent: 4550752 (1985-11-01), Manders
patent: 4643233 (1987-02-01), Manders
patent: 4989644 (1991-02-01), Tanaka et al.
patent: 5016676 (1991-05-01), Fourneaux et al.
patent: 5119863 (1992-06-01), Okesaku et al.
Falik Andrew M.
Iro AB
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