Textiles: weaving – Special-type looms – Irregular warp feed
Reexamination Certificate
2001-05-14
2002-05-21
Falik, Andy (Department: 3765)
Textiles: weaving
Special-type looms
Irregular warp feed
C139S026000
Reexamination Certificate
active
06390144
ABSTRACT:
PRIORITY CLAIM
This application is based on and claims the priority under 35 U.S.C. §119 of German Patent Applications 100 23 444.5 Ser. No. 09/855,150 filed on May 12, 2000, and 100 54 851.2 filed on Nov. 4, 2000, the entire disclosures of which are incorporated herein by reference.
1. Field of the Invention
The invention relates to a terry loom with a first thread supply arrangement for supplying a ground warp thread sheet and a second thread supply arrangement for supplying at least one pile warp thread sheet, shed forming elements for shedding the warp sheets, and cloth drawing-in means.
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. Background Information
Various methods and equipment are known for weaving a terry cloth with loops of a pile thread bound in by the weft threads. Typically, the pile loops are formed by a pile warp, while a further ground warp cooperates with the weft threads to form the base cloth. In this regard, the terry loom includes the components mentioned above and further includes weft insertion means and a reed or other weft beat-up means that cooperate with the above mentioned shed forming elements in a conventional manner.
More particularly, to form the terry cloth, the respective weft threads are first inserted and partially beat-up along a line at a prescribed spacing distance from the beat-up edge or cloth fell. Then, in a subsequent step the weft threads are fully beat-up against the beat-up edge of the cloth in a group-wise manner by performing a so-called full beat-up or group beat-up. While carrying out this group beat-up with the reed, the tension of the pile warp threads is reduced and additional lengths of the pile warp threads are supplied, so that the relatively loose pile warp threads are pushed along with the weft threads during the beat-up. Thereby the pile warp threads form pile loops puckering outwardly away from the base warp or ground warp. At the same time, the weft threads glide along between the ground warp threads, which are held under tension, until the weft threads reach their final beat-up position against the beat-up edge of the cloth.
These are merely the most basic aspects of the generally known technique of terry weaving, which is described in further detail, for example in the book “WEBEREI Verfahren und Maschinen fuer die Gewebeherstellung” (Weaving Methods and Machines for Woven Cloth Production”) by Dipl.-Ing. J. Schneider, published by Springer-Verlag Berlin/Göttingen/Heidelberg, 1961, pages 17 and 277.
A typical example of a terry weaving loom is known from German Patent 2,225,604, which also illustrates and describes the basic construction of such a terry weaving loom. The ground warp threads are fed or let out from a ground warp thread beam and are deflected over a spring-loaded tensioning beam into the horizontal weaving plane, in which they are combined, and united with the pile warp thread sheet which is fed or let out from a pile warp thread beam located above the weaving plane. Thus, the pile warp thread sheet and the ground warp thread sheet are united to form a common warp thread sheet including the interspersed ground warp threads and pile warp threads. The pile warp threads are guided over their own separate spring-loaded tensioning beam which is arranged above the ground warp thread sheet and extends across the weaving width so as to direct and introduce the pile warp threads from above, essentially tangentially into the ground warp thread sheet.
Further according to DE 2,225,604, the ground warp threads and the pile warp threads run through warp thread stop motions arranged in the weaving plane. Then, behind or downstream of these stop motions, the ground warp threads and pile warp threads in common run through shed forming elements in the form of healds or heddles, and from there extend through the weaving reed to the woven web edge which forms the so-called beat-up edge. The loom shed that is formed by the heddles according to the selected weaving pattern has the shed vertex of the front shed defined along the beat-up edge, and ends with the shed vertex of the back shed in the area of contact rods of the warp thread stop motion that serves in common for monitoring the ground warp threads and the pile warp threads.
The weft threads are respectively inserted into the open shed by the weft insertion means. Then, the weaving reed, for example cooperating with or carried by a sley that is not shown in detail, carries out a back-and-forth weft thread beat-up motion having a constant amplitude. Thereby, the successive weft threads inserted into the loom shed are first partially beat up into a partial beat-up position at a spacing distance away from the beat-up edge of the woven cloth, and then respective successive groups of the partially beat-up weft threads are group-wise completely beat-up against the beat-up edge of the woven cloth. To achieve this, the breast beam is controlled by a so-called terry eccentric so that the breast beam moves toward the reed, whereby the woven cloth also moves toward the reed, so that the constant amplitude beating of the reed can carry out the complete or group beat-up of the weft threads against the beat-up edge of the woven cloth. During this motion of the breast beam, the warp thread sheet is held under tension by the spring-loaded tensioning beam. Since the entire woven cloth and warp thread sheet are moved cyclically in this known method, one speaks of a “woven web motion control” for the loop formation of the pile threads.
In the above described known method and equipment, problems can arise while guiding together and combining the pile warp thread sheet with the ground warp thread sheet, particularly because neighboring pile warp threads can become hung-up or caught on one another while being let off from the pile warp beam, or the neighboring pile warp threads may even become partially looped around one another and thus tangled. These problems are especially more likely to occur because the pile warp thread tension must be reduced during the group beat-up in order to form the pile loops in the pile warp threads. There are certain types of thread or yarn that have a particularly strong tendency toward such tangling, due to their characteristics, their thread structure, or the fiber material contained therein. If such pile warp threads that are hung-up or tangled with one, another are fed into a warp thread stop motion in common with the ground warp threads, or especially all the way to the back shed and to the heddles, there is a danger that warp thread breaks or at least weave defects will arise.
The removal or correction of warp thread breaks in the area of the back shed in such looms is particularly difficult because the warp thread stop motions and the warp thread area, between the stop motions and the tensioning roller for the pile warp threads is very difficult to access from the warp beam side. This is the case, because these areas are substantially covered by the pile warp thread sheet in the manner of a curtain that extends practically entirely down to the weaving plane. Thus, in order to remove or correct a warp thread break, the operating personnel must reach through and between the pile warp threads and then search for the broken warp thread ends that are to be connected to each other, using a wire hook or some other suitable tool.
Since the warp thread stop motions are arranged in an area of the back shed in which the pile warp thread sheet runs into the ground warp thread sheet at a rather small acute angle relative to the weaving plane, this leads to the additional problem that a relatively strong back and forth motion of the pile warp threads arises in the area of the warp thread stop motion during the shed forming and pile loop forming operations. Such strong motion of the pile warp threads is undesirable, for example due to rubbing wear of the threads and resultant formation of fly lint, especially when weaving with rather sensitive pile warp threads. Moreover, due to this arrangement of the warp thread stop motion directly in front of the area of the back shed, the warp thread movem
Czura Peter
Laukamp Thomas
Mueller Herbert
Rupflin Fritz
Wahhoud Adnan
Falik Andy
Fasse W. F.
Fasse W. G.
Lindauer Dornier Gesellschaft GmbH
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