Textiles: weaving – Warp manipulation – Traversing
Reexamination Certificate
2001-01-29
2001-11-13
Falik, Andy (Department: 3765)
Textiles: weaving
Warp manipulation
Traversing
Reexamination Certificate
active
06315008
ABSTRACT:
PRIORITY CLAIM
This application is based on and claims the priority under 35 U.S.C. §119 of German Patent Application 100 03 919.7, filed on Jan. 29, 2000, and 100 57 692.3, filed on Nov. 21, 2000, the entire disclosures of which are incorporated herein by reference.
FIELD OF THE INVENTION
The invention relates to a weaving loom for the production of a leno fabric or cloth in which warp guide sections are provided for guiding the leno threads and the ground threads in the proper loom shed formation.
BACKGROUND INFORMATION
International Patent Publication WO 98/07913 discloses a device for controlling warp threads for the production of leno fabrics on a textile machine. Preferably the known device is part of a weaving loom and includes a sley carrying a conventional reed. A needle carrier carrying a multitude of needles is positioned above the fabric plane on the side of the reed facing the warps. The fabric plane is determined by the position of the beat-up line which extends in the fabric plane. Each of the needles comprises a needle eye. The needle carrier is operatively connected with a drive which oscillates the needle carrier together with the leno warp threads in a motion extending vertically to the fabric or weaving plane for opening and closing the shed.
A first heald frame is arranged downstream of the needle carrier on the warp facing side of the reed. The first heald frame is driven in a plane vertically to the weaving or fabric plane. The first heald frame comprises a guide bar positioned approximately in the fabric plane. The guide bar is provided with a multitude of slots arranged in a row and extending at a slant. One warp leno thread is guided in each of these slots, whereby an oscillatory cross motion is imposed on the warp threads in response to the oscillating vertical motion of the heald shaft. A second heald shaft is positioned on the warp side downstream of the first heald shaft. The second heald shaft is driven in a plane vertically to the weaving plane. The second heald shaft comprises a rod positioned approximately in the weaving plane. The rod is equipped with a slot extending crosswise and parallel to the weaving plane. The leno warp threads are guided in this slot.
A third heald frame drive for a vertical oscillating movement is equipped with a pair of compensating rollers. These rollers are driven relative to the third heald frame and the rotational direction of these rollers can be reversed in a controlled manner, for example by a drive that is operatively connected with a drive shaft.
The above described conventional warp thread control requires a substantial effort and expense for its construction due to the numerous components and their intricate cooperation. Another disadvantage is seen in that at least three separate drives are required, namely one drive for operating the heald frames, a second drive for the needle bar, and a third drive for the compensation rollers.
Another disadvantage of the conventional warp thread control is seen in that it requires means referred to as so-called negatively effective elements for displacing the leno threads in case the leno threads are insufficiently tensioned or if they are exposed to uneven tensions. In that case the leno threads are no longer positively guided in the slanted slots of the heald or shaft frame. As a result at least some of the leno threads do not perform an oscillating horizontally extending motion relative to the ground threads. Hence, faulty bindings and flaws are unavoidably formed in the leno fabric.
OBJECTS OF THE INVENTION
In view of the foregoing it is the aim of the invention to achieve the following objects singly or in combination:
to provide a weaving loom for producing leno fabrics having leno threads, ground threads, and weft threads, whereby the loom construction, compared to the prior art, is to be simplified while simultaneously avoiding the drawbacks of the prior art;
to improve the control or guiding of the leno threads and thus of the shed formation by simpler leno control sections; and
to reduce the number of drives for the warp control to not more than two drives, preferably only one drive for the vertical and horizontal motion of the warp control sections.
SUMMARY OF THE INVENTION
The above object have been achieved according to the invention by a weaving loom for producing a leno fabric which is woven of leno threads and ground threads forming warp threads and of weft threads, said weaving loom comprising a sley and a reed mounted on said sley, said reed defining a beat-up line in a beat-up position of said reed, said beat-up line extending in a weaving plane, said weaving loom further comprising a fabric guide positioned alongside said beat-up line for guiding said leno fabric downstream of said reed as viewed in a fabric withdrawal direction, and a warp control mechanism for controlling the movement of said warp threads upstream of said reed, said warp control mechanism comprising a first warp control section and a second warp control section, said first warp control section comprising at least one guide member for guiding said leno threads and a guide rod having a first plurality of passages for guiding said ground threads, said second warp control section comprising a thread detouring element for detouring said leno threads, and a needle bar having a second plurality of needles with needle eyes for guiding said leno threads wherein said first and second warp control sections are arranged in said weaving loom below said weaving plane, said weaving loom further comprising a common drive operatively connected to said first and second warp control sections for operating said first and second warp control sections.
According to the invention the first warp control section comprises guide elements for guiding the leno threads and guide elements for guiding the ground threads. The ground thread guides include a rod with a multitude of passages that extend axially in parallel to each other and that provide one passage for each ground thread. These passages are either upwardly open or closed. In both instances the arrangement of these passages form a new type of reed. The second warp control section comprises, on the warp facing side of the reed, preferably between the reed and the first warp control section, components for guiding and detouring the ground threads. The second warp control section comprises a needle bar carrying a multitude of needles arranged in a row. Each needle is provided with a needle eye. The second warp control section also includes a thread detouring element arranged next to the needle bar. Both the first and the second warp control sections have a length extending over the weaving width across the loom. A common drive is operatively connected to the first warp control section and to the second warp control section in such a way that the first warp control section is oscillated in a horizontal direction relative to the weaving plane while the second warp control section is oscillated vertically relative to the weaving plane.
The first warp control section comprises a support frame having an upwardly open U-frame configuration, including a first frame leg carrying at its free end the leno thread guide element or elements. The above mentioned multitude of axially parallel passages for the ground threads is arranged at the free end of the leno thread guide.
A support frame for the needle bar and for the detouring element is positioned between the first frame leg and the second frame leg of the U-configuration support frame, whereby the needle bar support frame is vertically displaceable up and down between the first and second legs of the U-configuration frame of the first warp thread control section.
The vertical displaceability of the support for the second warp control section is enhanced, for example by sliding guides formed on the inner inwardly facing surfaces of the legs of the U-configuration or these guides are formed directly by the inwardly facing surfaces of the U-configuration of the support frame for the first warp control section.
Dornier Peter D.
Haeussler Horst
Hehle Josef
Krumm Valentin
Vossen Juergen
Falik Andy
Fasse W. F.
Fasse W. G.
Lindauer Dornier Gesellschaft mbH
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