Stock material or miscellaneous articles – Sheets or webs edge spliced or joined – Sheets or webs coplanar
Patent
1993-09-07
1995-04-11
Cannon, James C.
Stock material or miscellaneous articles
Sheets or webs edge spliced or joined
Sheets or webs coplanar
24 33P, 156158, 162900, 1988442, 245 10, 428193, F16G 302
Patent
active
054056691
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a joint for industrial fabrics where each part of the fabric is formed with projecting loops formed by bending backwards the warp threads of the fabric, the return portions of these threads being reinserted in the weave for a given distance, the loops in one part of the joint being inserted between the loops in the opposite part for fixing in this position.
Examples of specifications which describe joints of the kind mentioned above are SE 7510836-5, SE 330825 and U.S. Pat. No. 4,658,863. The loops are normally fixed in their juxtaposed positions by a thread being inserted through all the loops and thus transverse the longitudinal direction of the fabric. A problem in joints of this kind is that all the warp threads in the fabric cannot be used to form loops when the collected width of the threads exceeds about 90% of the width of the fabric. The explanation for this is that it is not possible to obtain a sufficiently wide space between the loops for permitting the insertion of loops from the opposing fabric edge between these loops. This problem has been solved in different ways, inter alia by having only alternate threads forming loops, while intermediate threads have been cut off or returned into the weave without forming free loops. There has also been the procedure of forming loops at different distances from the end edge so that two or three rows of loops are formed, for example, where each row of loops is connected by a locking filament, e.g. according to U.S. Pat. No. 4,658,863.
SUMMARY OF THE INVENTION
The object of the present invention is to achieve a joint where all the warp threads in the fabric can coact in the joint even if their collected width is greater than 100% of the fabric width. By means of the invention, there is further achieved that there is a locking action in the longitudinal direction of the fabric without such as a locking filament being inserted through the loops. In most cases this radically simplifies making the joint, but also gives the possibility of using other fixing methods of the fabric parts other than the one using a locking filament. Tape can be used, for example. In addition, the advantage can be achieved that by the configuration of the loops space is provided between them that can be used for purposes other than making the joint.
The distinguishing features of the invention solving the above mentioned problem and providing the mentioned advantages will be apparent from the characterising portions of the following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described with reference to the accompanying drawing figures, while variations of the invention will be described without reference to drawing figures.
FIG. 1 shows a part of a woven fabric;
FIG. 1a shows an enlargement of the encircled area of FIG. 1;
FIG. 2 shows another part of a woven fabric; and
FIG. 2a shows an enlargement of the encircled area of FIG. 2.
Two parts 1 and 2 of a woven fabric are illustrated in FIGS. 1 and 2. These parts are united at their end edges so that the fabric becomes endless. To achieve this both end edges 3 and 4 are moved in towards each other. The part 1 of the fabric has loops 5 formed outside the fabric edge 3. Each loop 5 is formed by two warp threads 7 and 8 which cross over each other once at a point 9 lying spaced from the tip or point of return of the loop. This will be seen from FIG. 1a. After the warp threads 7 and 8 have crossed each other and have been bent into loops they are returned into the fabric and woven together with the weft threads or fixed in some other way. By the warp threads 7 and 8 being crossed, i. e. all warp threads being crossed in pairs to form loops, the space between the loops is enlarged, or there is at least obtained enlarged spaces between the loops of the upwardly facing part of the space between the loops in FIG. 1a.
At the end edge 4 of the other fabric part the loops are formed in a corresponding manner, but with the difference th
REFERENCES:
patent: 4026331 (1977-05-01), Lees et al.
patent: 4658863 (1987-04-01), Errecart
patent: 4695015 (1987-09-01), Salminen
patent: 4775446 (1988-10-01), Eschman
patent: 4938269 (1990-07-01), Nicholas et al.
patent: 5188884 (1993-02-01), Smith
patent: 5204150 (1993-04-01), Davenport
Cannon James C.
Scandiafelt AB
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