Textiles: weaving – Fabrics – Drier felts
Reexamination Certificate
2000-02-11
2001-05-01
Falik, Andy (Department: 3741)
Textiles: weaving
Fabrics
Drier felts
Reexamination Certificate
active
06223781
ABSTRACT:
FIELD OF TECHNOLOGY
The present invention relates to joining loops of joined parts of endless industrial fabrics such as a papermaker's fabric, a fabric for manufacturing a nonwoven material, a fabric for use in dewatering or squeezing sludge, a belt for manufacturing a building material, and a conveyor belt and to the joined parts
BACKGROUND OF THE INVENTION
Examples of the industrial fabrics heretofore used include papermaking fabrics such as a papermaker's forming fabric and a papermaker's forming canvas, nonwoven material manufacturing fabrics, sludge dewatering fabrics, building material manufacturing belts, and conveyor belts.
These industrial fabrics are processed in an endless manner, and attached to machines such as a papermaker and a dehydrator for use.
As a method of processing the endless shape, there are a large number of known methods such as a method of joining both ends of an industrial fabric by seams, a method of engaging loops formed on both ends using the warp of the industrial fabric itself with each other and passing a pin therethrough, a method of engaging spiral loops formed on both ends of an industrial fabric with each other and passing a pin therethrough, and a method of engaging metal hooks called clipper lacing attached to both ends of an industrial fabric with each other and passing a pin therethrough. These methods are employed in accordance with purposes.
However, each of the conventional processing methods had some problems.
When various performances such as the same smoothness as that of an ordinary part are required for a joined part of an industrial fabric, the method of joining by seams is the most suitable way in which the joined part is woven with the ordinary part and equally formed in substantially the same texture.
However, the method of joining by seams has a large problem that much labor is required, and has a critically large defect depending on devices to use.
Specifically, in the method of engaging the loops with each other in the endless manner, the endless or ended shape can freely be formed by extracting or inserting the joining pin. In the method of joining by seams, however, once the endless shape is formed, the shape cannot be returned to the ended shape until it is cut. If the endless or ended shape can freely be formed, the fabric having the ended state is extended between rollers of the device, and the endless shape can be formed on the spot during attachment to the device to use, so that the attachment to the device is very easy. For example, the attachment comprises setting the old used industrial fabric attached to the device to be in the ended state, connecting one end of a new industrial fabric to be attached to one end of the old fabric, operating the device to move and extend the industrial fabric between the rollers of the device, removing the old industrial fabric when the fabric is once moved around and entirely extended, and attaching the new industrial fabric in the endless shape.
On the other hand, in the method of joining by seams in which the endless or ended shape cannot freely be formed, a so-called cantilever system has to be performed. The system comprises supporting the rollers of the device on one side, removing supports, and other obstacles from the other side and inserting and extending the industrial fabric in a width direction from one side of the device.
However, the cantilever system has disadvantages that the manufacture cost of the machine itself increases, the device is enlarged in size, and that a large installation space is necessary.
Moreover, for the use of a very heavy or long industrial fabric, since it is difficult to insert the fabric, the system is unsuitable. Therefore, in the actual circumstances, the above-described cantilever system is unemployed in most cases excluding the papermaker's forming fabric used in the forming section of the paper making machine in which surface smoothness is regarded as very significant.
Therefore, in most cases the method of forming the loop or the method by the metal hook is employed as the method of forming the endless shape, because the ended shape can be formed again.
SUMMARY OF THE INVENTION
In the method, however, it is necessary to separately attach the spiral line or the metal hook which is a structure completely different from that of the industrial fabric. Even in the formation of the loop, since the texture of the loop forming part is different from the woven texture of the ordinary part, the loop is protruded from the end.
Therefore, since the structure of the joined part is completely different from that of the ordinary part, and a difference is produced in smoothness and air permeability, the loop, spiral line or metal hook directly contacts and puts a mark on a conveyed material, dewatering or drying nonuniformity is generated in the dewatering or drying industrial fabric, and other problems are caused.
Moreover, a large gap is frequently generated usually in the joined part as compared with the ordinary part, and the conveyed material disadvantageously leaks in this case.
To solve these problems, there are proposed a method of weaving a yarn provided with flexibility and elasticity into the loop part, a method of weaving in a tufted yarn and combing a yarn end to cover the top surface of the joined part, and other methods. In any case, however, since the structure of joining part is still different from that of the ordinary part of an industrial fabric, any of the methods could not provide a fundamental solution.
According to the present invention, in consideration of the above-described problems of the conventional joining methods, there are provided a joining loop of a joined part and the joined part formed in a joining method in which the loop is formed so that an endless or ended shape can freely be formed but the structure of a conveying surface of the joined part is formed in a structure substantially equal to that of an ordinary part.
The prevent invention relates to a joining loop of an industrial fabric joined by folding back a warp to both ends of the ended industrial multilayered fabric in which a weft is arranged in multiple layers to form the joining loop, and inserting a core line in a common hole of the joining loop formed by engaging both end joining loops with each other, the joining loop comprising: leaving at least one thread of weft of at least an upper layer part of the end;
removing the weft below the remaining weft of the upper layer part to form a loop forming part; folding back the warp of one end in the loop forming part; weaving the folded warp with the remaining weft of the upper layer part and weaving a tip end of the warp into an ordinary part to form the joining loop; folding back the warp of the other end; weaving the folded warp into the ordinary part without weaving the warp with the remaining weft of the upper layer part to form the joining loop; and forming the common hole below the upper layer weft. The warp of one end may be folded back in the loop forming part of the joining loop of the industrial fabric. Then the folded warp may be woven with the remaining weft of the upper layer part in the same woven texture as an upper layer woven texture of the ordinary part. The tip end of the warp can be woven into the ordinary part to form the joining loop. Further, at least one thread of weft of at least the upper layer part of the end can be left. Then the wefts below the remaining wefts of the upper layer part can be removed to form the loop forming part. The warp of one end weaving in the remaining weft of the upper layer part is folded back in the loop forming part, and the remaining part of the warp can be woven into the ordinary part to form the joining loop.
In addition, with regard to the loop forming part of the joining loop of the industrial fabric above, the warp of the other end may be also folded back. The folded warp can be woven with the remaining weft of the upper layer part and the tip end of the warp can be woven into the ordinary part to form the joining loop. In t
Itoh Senri
Yamada Jinzo
Falik Andy
Nippon Filcon Co. Ltd.
Rader Fishman & Grauer
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