Textiles: weaving – Warp manipulation – Traversing
Reexamination Certificate
2000-04-24
2001-10-30
Falik, Andy (Department: 3741)
Textiles: weaving
Warp manipulation
Traversing
Reexamination Certificate
active
06308742
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention further relates to a method for the preparation of a leno thread for a weaving; machine in accordance with the preamble of claim
8
.
2. Description of the Prior Art
A leno thread delivery apparatus for a weaving machine is known from the document EP 0 024 273 which has a complicated and expensive apparatus prone to wear in order to produce two mutually twisted or rotated leno threads respectively through a rotation of leno thread bobbins.
SUMMARY OF THE INVENTION
The object of the present invention is to propose an economically more advantageous apparatus for the preparation of a leno thread.
This object is satisfied in particular by an apparatus for the preparation of at least two leno warp threads for a weaving machine, comprising a first holder apparatus for the reception of a first leno thread bobbin, also called the first warp thread bobbin in the following, as well as comprising a second holder apparatus for the reception of a second leno thread bobbin, also called the second warp thread bobbin, as well as comprising a rotatably journalled thread guide apparatus which supplies the leno warp threads to a weaving machine which is placed after it in the direction of thread travel, with the first holder apparatus being arranged first in the direction of thread travel, followed by the second holder apparatus, then being followed by the thread guide apparatus, with a thread guide element for the guiding of the first leno warp thread, which is to be drawn off from the first warp thread bobbin, being arranged substantially in the direction of thread travel and extending adjacent to the second holder apparatus, and with the thread guide element having an entry opening for the first leno warp thread which is arranged ahead of the second holder apparatus in the direction of thread travel, and with the thread guide element being designed to extend in such a manner and is rotatable through 360° and drivably journalled about an axis of rotation which extends substantially in the direction of thread travel in such a manner that the second warp thread bobbin, which can be arranged on the second holder apparatus, can be circled by the thread guide element in order to twist the first leno warp thread, which emerges from the thread guide element, with the second leno warp thread, which extends between the second warp thread bobbin and the thread guide apparatus.
The apparatus in accordance with the invention has the advantage that the holder apparatuses for the warp thread bobbins, and thus naturally also the warp thread bobbins themselves, are arranged in a fixed, i.e. stationary, manner. The apparatus in accordance with the invention has only a small number of moving parts, for which reason it is very economical to manufacture and in addition ensures a reliable and economical operation. A particular advantage of the apparatus in accordance with the invention and of the method in accordance with the invention respectively is to be seen in that the possibility also exists of mutually winding the leno warp threads around each other with a high speed of rotation, which is of central importance for a high performance weaving machine such as a series shed weaving machine, since the high weaving performance requires a correspondingly rapid preparation of the leno warp threads. A further advantage is to be seen in that the leno warp threads are continually mutually twisted rotating in the same direction, which has the advantage that a time consuming change of the direction of rotation during the twisting is no longer required.
The apparatus in accordance with the invention comprises a thread guide apparatus which is intended to supply the thread in a manner which is synchronised with respect to the working process of the weaving machine, in order to hold the leno warp threads in the position required for the weft insertion while forming a shed. The apparatus in accordance with the invention has the advantage that the distance between the thread guide apparatus and the apparatus which rotates the leno warp threads, also designated as a pre-rotation apparatus, can be chosen as desired so that the thread guide apparatus can for example be arranged in the vicinity of the weaving machine or forming a part of the weaving machine, whereas the pre-rotation apparatus can be arranged at a different location.
REFERENCES:
patent: 795353 (1905-07-01), Lowrie
patent: 2676618 (1954-04-01), Pfarrwaller
patent: 5996646 (1999-12-01), Hockemeyer et al.
patent: 6039086 (1999-12-01), Dornier et al.
patent: 6092559 (2000-07-01), Dvorak et al.
patent: 858976 (1952-12-01), None
patent: 297 08 758 U1 (1997-09-01), None
patent: 0024273A1 (1981-03-01), None
patent: 1195466 (1970-06-01), None
Peulen Jaques
Uhricek Peter
Falik Andy
Sulzer Textil AG
Townsend and Townsend / and Crew LLP
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