JP2953673B2 - Osa for high-speed loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a leg for a high-speed loom, and more particularly, to a leg with a hard film coated thereon to improve the abrasion resistance of the leg of the leg. Related to high speed loom.

[Background Art] Osato, a part of the loom, is used to align the warp yarns of the loom and press the weft yarns to adjust the weave. A large number of wings made of thin metal plates are paralleled at minute intervals. And fixed by a frame composed of the main wings on both left and right ends and the upper and lower rims. Stainless steel feathers are generally used in high-speed looms.However, the speed of operation of the loom and the emergence of new material fibers cause heavy wear, and the wear resistance of the feathers becomes a major problem. ing.

In other words, the wear of the wings causes fluffing of the woven fabric and the breakage of the thread, and replacement of the wings requires a great deal of labor and cost. Therefore, the durability of the wings determines the work efficiency and cost of the loom. Has become the biggest factor. In the woven fabric, there is a phenomenon called "weaving shrinkage" in which the width of the woven fabric is smaller than the arrangement width of the warp yarns. And the durability of this part determines the overall life of the sheath.

Therefore, in order to improve the durability of the rabbit, a hard chrome plating film, especially on the surface of the rabbit in the vicinity of both ends of the rabbit,
Ceramic films such as tungsten carbide, titanium carbide and titanium nitride (JP-A-60-52658) and chromium oxide films (JP-A-6-52658)
It has been proposed to coat a hard film having excellent abrasion resistance such as No. 1-245346 and US Pat.

The hard chromium plating film is coated by electroplating, but has insufficient abrasion resistance, and has problems in adhesion and corrosion resistance. The ceramic film is coated by a PVD (physical vapor deposition) method, a CVD (chemical vapor deposition) method, a thermal spraying method, or the like, but has problems such as adhesion and softening of the substrate due to high temperature treatment. The chromium oxide film is coated by a thermochemical method and is effective for polyester fibers, but not so effective for natural fibers and new material fibers.

It is known that the wear of the wings is a phenomenon in which the type of fiber, frictional force, vibration characteristics of the wings, etc. are complicatedly related, and that a hard film with a high surface hardness does not always give good results. I have. Therefore, although a hard film adapted to the type of fiber, the operating speed of the loom and other conditions is employed, the durability is improved by about 2 to 5 times compared to the untreated stainless steel base material. Not just.

DISCLOSURE OF THE INVENTION Accordingly, an object of the present invention is to provide, at a relatively low cost, a wing that has been adapted to a wide variety of fibers from natural fibers to synthetic fibers and new material fibers, and has dramatically improved durability. It is to be.

For the above purpose, in the present invention, a portion of the wing that requires the most wear resistance is coated with a diamond-like carbon film (hereinafter abbreviated as DLC film). Also, when stainless steel was used as the base material for the wings, an intermediate layer made of, for example, a titanium carbide layer was interposed between the base material and the DLC film to improve the adhesion. further,
Place the wings coated with DLC film near both ends of the hardest wearing wings, and in the middle part of the wings the wings coated with a relatively low-cost hard film or untreated. By arranging the wings, the wear amount of the wings is leveled over the entire umbrella, so that the overall durability is improved at a relatively low cost.

The DLC film used in the present invention is an amorphous carbon film bonded with hydrogen, and is introduced in, for example, the following literature.

(A Review of Recent Work On Hard i-C Films; LPA
ndersson; Thin solid Films, 86 (1981) 193-200
Page) One example of a method for forming a DLC film is a plasma CVD process in a hydrocarbon gas atmosphere. The DLC film has hardness next to diamond, high thermal conductivity about five times that of copper, and has a very low coefficient of friction. These features are used for sliding surfaces of machine parts. The feature of high tensile strength and low internal friction realizes vibration characteristics suitable for audio equipment, and is therefore applied to diaphragms of speakers and the like. There are still many unclear points about the behavior of the DLC film in the wear mechanism of the wings driven at high speed, but it is not only that the surface hardness is high and the friction coefficient is small, but also the thermal conductivity and vibration characteristics. It is considered that this contributes to the improvement of the durability of the mosaic feather.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an object of the present invention and the prior art, FIG. 2 is a plan view of a flat wing of the present invention and the prior art, FIG. FIG. 4 is a plan view of a deformed wing which is an object of the present invention and the prior art, FIG. 4 is a sectional view of a main part of a wing in an embodiment of the present invention, and FIG. FIG. 6 is a partial cutaway front view, and FIG. 6 is a diagram showing the relationship between the position of the wing and the amount of wear in the present invention and the prior art.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 6 is a diagram schematically showing the relationship between the position of the wings and the amount of wear under average working conditions of the high-speed loom for three types of wings. The horizontal axis indicates the position of the wing by the number of wings counted from the side end of the wing. Curve ADHM
Indicates the amount of wear of the wings made of untreated stainless steel substrate, curve BEFKN indicates the amount of wear of the wings coated with the hard chrome plating, and curve CGL indicates the amount of wear of the wings coated with the DLC film according to the present invention.

As described above, the life of the trousers is determined by the wear of the outermost end (first sheet) where the wear is most severe. The amount of wear of the outer edge feather is halved from A to B. The wear amount B is the wear amount D of the 30th untreated wing.
Therefore, by applying hard chrome plating to the up to thirty blades, the wear amount of the entire blade can be reduced to a level of B or less. However, plating the inner wings beyond the 30th one does not extend the life of the entire wings.

On the other hand, when the DLC film is coated according to the present invention, the abrasion amount of the outermost end feather is drastically reduced from A to C. This wear amount C corresponds to the wear amount H of the 110th untreated wing. Therefore, in order to sufficiently exhibit the effect of the DLC film coating, it is necessary to coat at least the 110th sheet.

The coating of the DLC film is a relatively expensive treatment, but its practical use is sufficiently recognized depending on the conditions of the woven fabric due to the remarkable improvement in the durability of the pod. It is also extremely effective to use the DLC film in combination with another hard film. In the example shown in FIG. 6, the wear amount C at the outermost end of the DLC film-coated wing corresponds to the 45th wear amount F of the hard chrome-plated wing. So 1 ~
If the 45th sheet is coated with a DLC film and the 46th to 110th sheets are subjected to hard chromium plating, the same effect can be obtained as if all the wings were coated with the DLC film. In this way, by combining multiple hard films with different processing costs and abrasion resistance, the wear of the wings is leveled over the entire wing, and the durability of the wing is dramatically improved at a relatively low cost. Can be done.

FIG. 1 is a front view of a sheath to which the present invention and the prior art are applied.

The leg 10 is formed by holding a large number of legs 20 in parallel at a predetermined interval by a frame 16 composed of upper and lower rims 12 and main wings 14 on both left and right ends. The wing 20 is made of a thin metal plate and has a plan shape as shown in FIG. 2 or FIG.

The wing 20A shown in FIG. 2 is a simple band-shaped one called flat wing.

The wing 20B shown in FIG. 3 is called a deformed wing, and is used for a water jet loom and an air jet loom. In any of the feathers, the hatched portions in FIGS. 2 and 3, 22A and 22B, that is, the central portion of the feather is the largest wear portion which receives the most extreme friction, and In the wing, at least a part of the wing including this part is covered with the DLC film.

Generally, stainless steel is used as the base material of the wings. However, when the surface of the stainless steel is directly coated with the DLC film, the adhesion is insufficient, and the object of the present invention is not achieved.

Therefore, in the present invention, an intermediate layer is interposed between the stainless steel base material and the DLC film to improve the adhesion. The intermediate layer is made of chromium (Cr) or titanium (Ti), which has good adhesion to stainless steel.
A two-layer film with silicon (Si), which has good adhesion to the film, and a carbide film such as titanium (Ti), zirconium (Zr), and hafnium (Hf) are effective. Containing titanium carbide film (JP-A-64-79372)
No.) was the most effective.

FIG. 4 is a cross-sectional view of a main part of the maximum wear portion 22B of the wing 20B shown in FIG.

A titanium carbide film is coated as an intermediate layer 26 on the surface of a base material 24 made of stainless steel, and further on the surface.
The DLC film 28 is covered. The titanium carbide film can be formed by a plasma CVD method in a vacuum chamber into which a hydrocarbon gas has been introduced.

FIG. 5 is a front view of a wing showing the arrangement of wings in another embodiment of the wing according to the present invention.

The wings 20 are divided into three groups, that is, a first group 201, a second group 202, and a third group 203 in order from the group close to the main wings 14 on both side ends toward the center. The first group 201 is composed of a group of wings in which the surface of a stainless steel substrate is coated with a DLC film via an intermediate layer, and the second group 202 is a surface of the stainless steel substrate in which a hard layer of a different type from the DLC film is formed. The group of FIG. 3 group 203 is a group of wings made of uncoated stainless steel base.

As described above, the present invention comprising a plurality of feather groups, the present invention in which all the feathers are coated with the DLC film, and the prior art in which a hard film different from the DLC film is coated. Various types of fibers were woven using a general diaper composed only of a stainless steel base material and a stainless steel base, and the durability of the diaper was examined. The results are shown in Tables 1, 2 and 3.

Table 1 shows the results of a durability test when a standard woven fabric was used with a high-speed loom using the most common cotton yarn as the fiber. As shown in Comparative Example 1, when a woven fabric was executed under a predetermined condition using a conventional shoe made of only a stainless steel base material, "thread breakage" and "fluffing" occurred in about 12 hours of operation. Such defects have occurred. The durability ratio was calculated from the operating time until the occurrence of a defect, using the result as a durability reference value of 1.0.

As shown in Comparative Example 2, the durability of the conventional example in which the wings at the side end corresponding to 10% of the entire wings are coated with hard chrome plating has more than double the durability. In addition, as shown in Comparative Example 3, in the conventional example in which the wings at the side ends corresponding to 20% of the whole were coated with chromium oxide (Cr ₂ O ₃ ), the durability was tripled. I have.

On the other hand, as shown in Example 1, 40%
In the case of the present invention in which the DLC film is coated on the portion of the feather corresponding to the above, the durability is improved about 7 times.

In this case, the cost of the fish itself rises about five times,
Considering the quality of the woven fabric and the operating efficiency of the loom, profitability can be fully realized. On the other hand, as shown in Example 2, a portion corresponding to 10% of the side end portion receiving the largest frictional force is coated with a DLC film to form a first group, and a second group subsequent thereto is coated with chromium oxide. And the wings made of stainless steel are arranged as a third group in the part corresponding to 60% of the central part. Thus, the same durability as that of the first embodiment can be obtained, and the cost can be reduced by half. As described above, employing a plurality of types of hard films and leveling the wear amount over the entire surface is an effective means for reducing costs.

It is known that when weaving irregularly shaped polyester fibers having a complicated cross-sectional shape, the wings made of a stainless steel base are significantly worn and the operating efficiency of the loom is extremely low. Table 2 shows examples in which the inventive fabric is applied to a woven fabric of irregularly shaped polyester fibers, together with comparative examples. As shown in Comparative Example 4, the wear of the wings made of the stainless steel base material is remarkable, and the durability is reduced to about 30% of the case where cotton yarn is woven. Therefore, as shown in Comparative Example 5, a male wing having hard chrome plating coated on the wings near the side end is used.

On the other hand, as shown in Example 3, in the case of the present invention in which a portion corresponding to 70% of the whole from the side end is covered with the DLC film, the durability is remarkably improved. Further, as shown in Embodiment 4, if the DLC film and the hard chromium plating are used in combination, the cost can be reduced.

Fibers in which ceramic fine powder having a special function is adhered together with a paste material have attracted attention as functional new material fibers. As shown in Comparative Example 6, when the new material fiber is woven using ordinary stainless steel wings as described above, a defect occurs in a very short time, and it is practically impossible to operate. Therefore, as shown in Comparative Example 7, an outer blade is used in which a titanium nitride (TiN) film, which is known as an ultra-hard film, is entirely coated. However, also in this case, the amount of abrasion of the feather is large, and a defect occurs in a few hours, so that the workability is poor and the operation efficiency of the loom becomes extremely low.

On the other hand, as shown in Example 5,
The use of the inventive fabric coated with the DLC film enables continuous operation for 8 hours, and there is no particular problem in the workability of the woven fabric. Also in this case, if the DLC film is coated only in the vicinity of the side end and the wings coated with the titanium nitride film are arranged in the center as shown in Example 6, the cost can be reduced and the same The effect can be obtained.

As described above, according to the present invention, the following specific effects can be obtained.

(1) The sheath of the present invention is applied to various fibers from natural fibers and synthetic fibers to new material fibers, and exhibits excellent durability.

(2) Since the effect of the DLC film having a thickness of 2 to 3 μm including the intermediate layer is sufficiently exhibited, the present invention can be applied to a fine pattern having a small arrangement interval.

(3) Considering the quality of the woven fabric and the operating efficiency of the loom, it is possible to reduce the overall cost.

Claims (2)

(57) [Claims] 1. A large number of wings made of a stainless steel thin plate are arranged in parallel with each other at a predetermined interval in the thickness direction, and a pair of wings located at both left and right outermost ends and a pair of upper and lower wings are provided. A pair of side wings fixedly held by a frame body made of a pair of rims, a pair of side wings each comprising two groups of a plurality of wings arranged adjacent to the pair of main wings. When the remaining group consisting of a plurality of wings adjacent to the pair of side edge wings at the left and right ends is referred to as a central wing group, the maximum wings A plurality of wings, at least part of which includes a wear portion, is coated with a diamond-like carbon film (hereinafter abbreviated as DLC film) formed by a plasma CVD method via an intermediate layer, and the plurality of wings are exclusively formed on the side edge portions. On the other hand, each wing of the central wing group is coated with a DLC film. At least some of the plurality of wings adjacent to the side edge wing group of the central wing group are covered with another hard film different from the DLC film. Osa for high-speed loom characterized by the following. 2. The hard film different from the DLC film is a film selected from a hard compound film made of an oxide, a carbide or a nitride, and a hard chromium plating film. The high-speed loom described in the above.