JPH04281039A - Seamless tubular woven fabric - Google Patents

Abstract

PURPOSE:To provide a seamless tubular woven fabric useful as a base cloth for seamless ink ribbon and a base cloth for seamless belt. CONSTITUTION:In the production of a seamless tubular woven fabric by a hollow weaving process, a yarn-line recognition weft (2b) distinguishable from main weft (2a) is intermittently inserted into a texture formed by weft (2) of ground weave constructed of warp (1) and weft (2). Preferably, the process is performed by using an intermittently dyed weft (2) and inserting the weft by a single shuttle process.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seamless tubular fabric useful as a base fabric for applications such as seamless ink ribbons and seamless belts.

0002

2. Description of the Related Art Seamless ink ribbons are used in impact printers for computers, word processors, and other devices. Seamless belts are also used for power transmission or transportation. The base fabric of these seamless ink ribbons and seamless belts is obtained by cutting a seamless cylindrical fabric obtained by a hollow weaving method into rings in the radial direction.

[0003] Seamless tubular fabrics are typically made by arranging the warp threads on the front and back sides and suspending them between threads belonging to different movement systems, while appropriately controlling the movement of the warp threads in the two systems. It is obtained by performing a weft insertion motion using one weft thread, and weaving so that the warp threads on the front and back sides are connected by the weft thread only at the ends of both ends. (“Product Knowledge Series, Practical Knowledge of Textiles, 6th Edition, Published by Toyo Keizai Inc., 1986.
(Refer to pages 143-145 of 9th edition published on October 20, 2017)

[0004] Normally, during weaving, the warp threads are coated with a sizing agent, and after weaving, scouring is performed to remove the sizing agent. After scouring, the cylindrical fabric is inserted into a suitable support, and after being properly heat-set by calender treatment, it is shaped.
The radial cut is made by fusing or other means.

Although not directly related to the present invention,
Japanese Unexamined Patent Publication No. 61-254377 discloses that a thread made of heat-melting fiber is intermittently supplied as a weft to form a border line in a multicolored ribbon, and Japanese Utility Model Application No. 55-57456 The publication states that in order to reinforce the strength of the base fabric for ink ribbons, one to several threads harder than the threads constituting the base weave are woven in the warp direction of the fabric at intervals of an arbitrary number of threads in the base weave. It has been shown that

[0006]

[Problem to be solved by the invention] As mentioned above, when cutting a seamless cylindrical fabric to obtain a base fabric for a seamless ink ribbon or a seamless belt, cutting is performed with the cylindrical fabric inserted into a support. However, in that case, although it is possible to accurately align the warp direction, it is extremely difficult to accurately align all the weft yarns in the radial direction.

[0007] Therefore, when cutting is performed in the radial direction, it is not possible to cut parallel to the weft threads, and a cut portion of the weft threads is generated on the cut surface. If this happens, the homogeneity of the base fabric will be impaired, and for example, when this is used as an ink ribbon and stored in a cassette, the ribbon will wave in a ``seaweed'' shape near the head, resulting in unclear prints and paper stains. There are things to do. This ``seaweed''-like waving becomes less noticeable by applying tension to the ribbon, but increasing the tension means increasing the power, which is disadvantageous in terms of energy. The market demand is to reduce power as much as possible, and it is urgent to meet this demand. Further, the occurrence of a weft cut portion on the cut surface may cause disadvantages such as loosening from the cut surface, decrease in strength, and meandering during running.

[0008] When cutting a seamless tubular fabric, if it is possible to grasp the state of the weft threads, the cutting can be performed parallel to the weft direction. From this viewpoint, the present invention has been made for the purpose of providing a seamless cylindrical fabric in which the presence or absence of distortion in the weft yarns or the state of distortion can be determined.

[0009]

[Means for Solving the Problems] The seamless tubular fabric of the present invention is a tubular fabric obtained by a bag weaving method, in which the weft (2) of the ground structure composed of the warp (1) and the weft (2) is provided. ) is characterized in that weft yarns (2b) for checking yarn lines, which are distinguishable from the main weft yarns (2a), are inserted intermittently.

The present invention will be explained in detail below.

[0011] The seamless tubular fabric is obtained by a hollow weaving method. In other words, when the weft threads are making a weft insertion motion with respect to the front warp threads, the back warp threads are held in a position where they do not participate in the weft insertion motion, and when the weft yarns are turned back to perform the weft insertion motion, the back warp threads are raised up. Then, the warp threads on the front side are placed in the standby position. This operation is repeated on the front and back by appropriately controlling the vertical movement of the plate. At this time, the front warp and the back warp are tied together by the weft only at both ends.

[0012] The warp (1) and weft (2) include synthetic fibers (including high-strength fibers and heat-resistant fibers), semi-synthetic fibers, recycled fibers, natural fibers, carbon fibers, glass fibers, ceramic fibers, and metal fibers. Threads made from fibers such as Nylon multifilament yarns and polyester multifilament yarns are of particular interest for ink ribbons.

[0013] In the present invention, out of the ground structure composed of the warp (1) and the weft (2), the weft (2)
A weft (2b) for checking yarn lines, which can be distinguished from the main weft (2a), is intermittently inserted into the weft. One or several reciprocations of the weft yarn (2b) for checking the yarn line per unit are sufficient.

The following two methods can be adopted as the weft insertion method described above.

One method is to intermittently dye one weft thread (2) separately, and then insert the dyed weft thread (2) one by one to form the main weft thread (2a) area and yarn line. This is a method of forming a weft (2b) region for confirmation. For example, dyeing may be done by intermittently dyeing the yarn wound around cheese or corn while unwinding it, passing it through a drying oven, and then rewinding it onto the bobbin.

Another method is to separately use the main weft (2a) and the weft for checking yarn line (2b), and to insert them by two threads.

In the latter case, a cut end of the thread will occur at the end of the tubular fabric when the thread is switched, so when comparing the former and the latter, it can be said that the former is a more preferable method. .

[0018] The weft (2b) for yarn line confirmation is the main weft (2a)
In order to make it distinguishable, it is sufficient to simply change the color or tone so that it can be seen visually, but it may also be possible to make it visually distinguishable only under certain conditions (for example, under black light irradiation), or by using other optical means. It may also be possible to identify it by electrical means, magnetic means, or the like. In any case, since the weft (2b) for yarn line confirmation also becomes part of the product fabric, it is advantageous not to change the fiber material, fiber thickness, or number of fibers per yarn from the main weft (2a). It is.

The seamless tubular fabric of the present invention is particularly useful as a base fabric for applications such as seamless ink ribbons and seamless belts.

[0020]

[Operation] The seamless tubular fabric of the present invention is cut in the radial direction by melt cutting or mechanical cutting using the weft (2b) for checking threads as a guide while the tubular fabric is fitted onto a roll or plate. This is accomplished by making a cut. This cutting may be performed while observing the weft (2b) for yarn line confirmation with the naked eye, or may be performed automatically by sensing the weft (2b) for yarn line confirmation with a sensor. Thereby, cutting can be performed parallel to the weft (2).

[0021]

[Examples] Next, the present invention will be further explained with reference to Examples.

Example 1 FIG. 1 is a perspective view showing an example of the seamless tubular fabric of the present invention. FIG. 2 is an explanatory diagram showing an example of the process of dyeing the weft (2). FIG. 3 is a perspective view showing the state in which the seamless tubular fabric is cut in the radial direction.

Weft (2) dyed using 40d/34f nylon multifilament yarn according to Figure 2
was created. That is, while unwinding the colorless thread wound around the cheese (5), the thread was intermittently dyed by the dyeing means (6). The length of the dyed area was such that it would go back and forth twice during weft insertion. This was then passed through a drying oven (7) and then wound onto a bobbin (8) while being traversed. As a result, one weft (2) was intermittently dyed to create a weft (2) in which a main weft (2a) area and a weft (2b) area for checking yarn lines were formed, and this was used as a shuttle. I inserted it.

40d/ glued as warp (1)
Using a 34f nylon multifilament yarn and using the above dyed yarn as the weft (2),
A seamless cylindrical fabric with a circumferential length of 1600 mm was woven using the bag weaving method using the tabi method (see Figure 1). Thread density is 132 threads/inch for warp (1) and 1 thread/inch for weft (2).
It was set to be 42 pieces/inch.

The seamless cylindrical fabric obtained above is scoured by a conventional method, further heat-set, and then placed between two rollers (3), (3) as shown in FIG. ，
While (3) was being rotated, a cutter blade (thermal blade) (4) was brought into contact with the cylindrical fabric using the weft yarn (2b) for yarn line checking as a guide, and the fabric was melt-cut to a width of 8 mm in the radial direction.

When the melted surface of the obtained seamless ink ribbon base fabric was observed, it was found that the melted surface was parallel to the weft (2) at the end.

When this base fabric was impregnated with ink to form an ink ribbon and placed in a cassette for printing, the ribbon remained in a "wakame" state near the head even when the power was extremely reduced.
It was possible to print clearly without any blemishes.

Example 2 FIG. 4 is a perspective view showing another example of the seamless tubular fabric of the present invention.

Colorless and dyed wefts (2) made of 40d/34f nylon multifilament yarn are prepared, and the colorless one is used as the main weft (2a), and the dyed one is used as the weft for checking the yarn line (2b). did.

40d/ glued as warp (1)
A seamless cylindrical fabric with a circumference of 1800 mm was woven using a 34 f nylon multifilament yarn and the above two types of yarn as the weft (2) by a two-way bag weaving method (see FIG. 4). Thread density is warp (1)
146 pieces/inch, weft (2) 148 pieces/inch
It was set to be inch. The intermittent insertion of the weft yarn (2b) for checking the yarn line was made one round trip each time.

The thus obtained seamless cylindrical fabric was refined by a conventional method and further heat-set, and then prepared in Example 1.
In the same manner as above, it was cut to a width of 13 mm in the radial direction. When the melted surface of the obtained seamless ink ribbon base fabric was observed, it was found that the melted surface was parallel to the weft (2) at the end.

When this base fabric was impregnated with ink to form an ink ribbon and placed in a cassette for printing, the ribbon remained in a "wakame" state near the head even when the power was extremely reduced.
It was possible to print clearly without any blemishes.

[0033]

Effects of the Invention In the seamless tubular fabric of the present invention, the weft (2) is distinguished from the main weft (2a) in the ground structure composed of the warp (1) and the weft (2). Since the weft yarn (2b) for checking possible yarn lines is inserted intermittently, when cutting this tubular fabric in the radial direction,
It becomes possible to cut parallel to the weft (2b) for checking the yarn line as a guide.

Therefore, no weft cuts occur on the cut surface, and the homogeneity of the base fabric is maintained. For example, when this is used as an ink ribbon and stored in a cassette, even if the power is small, there will be no weft cuts near the head. This prevents the ribbon from waving in a ``seaweed'' pattern. Furthermore, the disadvantages of the conventional art, such as loosening from the cut surface, reduction in strength, and meandering during running, are eliminated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a seamless tubular fabric of the present invention.

FIG. 2 is an explanatory diagram showing an example of the process of dyeing the weft (2).

FIG. 3 is a perspective view showing a state in which the seamless tubular fabric is cut in the radial direction.

FIG. 4 is a perspective view showing another example of the seamless tubular fabric of the present invention.

[Explanation of symbols]

(1) ...Warp, (2) ...Weft, (2a) ...Main weft, (2b) ...Weft for thread line confirmation, (3)
…Roller, (4) …Cutter blade, (5) …Cheese, (6) …Dyeing means, (7) …Drying oven, (8) …Bobbin

Claims (3)

[Claims] Claim 1: In a tubular fabric obtained by the bag weaving method, a main weft (2a) is included in the weft (2) of the ground structure composed of the warp (1) and the weft (2). A seamless cylindrical fabric in which discernible weft yarns (2b) for checking yarn lines are inserted intermittently. Claim 2: One weft (2) is intermittently dyed in the main weft (2a) area and the weft (2b) for checking yarn lines.
2. The seamless tubular fabric according to claim 1, wherein the dyed weft yarns (2) forming a region are inserted one by one. Claim 3: Main weft (2a) and thread confirmation weft (2b)
2. The seamless tubular fabric according to claim 1, wherein the weft is inserted in two rows.