JPS5818450A - Cutter for shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel cutter for frameless looms that has excellent corrosion resistance, abrasion resistance, and toughness.

To explain the weaving mechanism associated with cutting the weft yarn in current shuttleless looms, especially water jet looms, as shown in Fig. 1, the warp yarn 18 is vertically moved by the healds 12 to form a shed 14, and the weft After the thread 17 is inserted,
Reed 1! I to form a predetermined density, the fabric 1
It becomes 5. on the other hand.

The weft yarn is unwound from a yarn feeding cheese 1, passes through a tension device 2, is measured by a feed roller 4, passes through a pool pipe 3 and a gripping device 5, and reaches a jet nozzle 16. here,
The jet nozzle 16 obtains pressurized water sucked up by the jet pump 7 from the water storage tank 6 and transfers the weft yarn 17 to the shed 14.
Insert it into .

The driven weft thread is held at one end by the gripping device 5, by the selvage assembly device 11 at the other end, by the temporary weft spindle 9, by the thread end processing system 10, and then by the heat cutter 8 under constant tension. Amputated.

The next step is to insert the weft thread.

In this regard, the cutters currently in use for cutting the weft yarn are mainly heat cutters that turn the yarn red hot by passing an electric current through it to melt and cut the yarn. This is the reason why it is adopted.

1) Traditionally, metal shearing cutters (e.g. scissor type) used in rapier looms and air jet looms are not corrosion resistant or
Lacks durability.

2) Even with a heat cutter, the area around it is always moist and there is no risk of fire.

However, on the other hand, there are many problems as shown below. That is.

2) Poor durability: Average lifespan is 2.5 months.

3) The cutter on the side opposite to the jet nozzle is easily cooled by the water-containing weft thread, which sometimes causes miscuts.

4) When starting the loom, it is necessary to wait for the hot wire to become red hot.

Examples include. Moreover, in the weaving of differentiated materials, which has been studied in recent years to expand the versatility of pattern looms, welding errors often occur.

In order to prevent this, it is necessary to increase the heat output of the heat cutter, which in many cases leads to an increase in power consumption.

In other words, materials that easily contain a large amount of water such as spun yarn and spunlike processed yarn, or one synthetic filament yarn, have a moisture content of 200 to 50%.
For thick yarns with a fineness close to 0 denier or specially processed yarns with extremely good cohesiveness, the power required for the cutter can reach up to about 50 times the total power used by the loom.

- In this way, the fact that such a large amount of thermal energy is required for the mere cutting action of the weft thread is becoming a burden in the current era of high energy consumption.

From the viewpoint of energy saving, it is desirable to find a solution to this problem.

Here, the inventors focused on and conducted various studies to see if this problem could be solved with a shear type cutter (scissor type) that can utilize part of the kinetic energy of the loom and does not require a large energy source. It was layered.

The shearing cutter mentioned here combines two cutting edges, upper and lower. This is a so-called scissor-type cutter, and there are various possible drive sources for operating it on the loom, such as using a separate motor, using the peeting force of the lace ord, or taking the drive from the rocking shaft. However, the energy required for both is small, and it is especially optimal for water jet looms and air jet looms to use a rocking shaft as the drive source, and in this case, the required energy can be judged to be zero.

However, the only drawback with conventional metal cutters is that the cutting edge lacks corrosion and wear resistance.

Until today, we have not succeeded in developing an appropriate material.

The present inventor focused on ceramic materials that have recently begun to be used as cutting tools, and as a result of conducting a loading study for application to shear-type cutting edges, the inventor found that they have extremely superior corrosion and wear resistance compared to conventional cutting edges. He succeeded in obtaining it.

The present invention has the following configuration.

That is, in one aspect of the present invention, the weft thread cutting blade has a ceramic claw structure. □Yo□O, ya shuttle...□Regarding the cutter.

The present invention will be explained in detail below. It goes without saying how important the durability of the weft thread cutting blade is, but quarter jet looms are now operated at high speeds of 400 to 800 rpm, and when inserting the weft thread, each pick has a speed of 2 to 80 rpm.
Weaving is carried out while spraying 4ac of water, and the raw oil applied to the weft is washed away by this water, and the amount of oil attached, which is usually 0.3 to 1.0%, is on the order of one order or more. Decreased.

The condition is almost like that of naked light.

Furthermore, the metal at the cutting edge is always in a wet state, rust develops with long-term use, and the combination of the two causes corrosion, and repeated high-speed cutting causes cutting performance to deteriorate in a short period of time.

The weaving performance of current water jet looms is extremely high (
,100,! We are now in a situation where the number of stops per P-pick is an issue, and sustainability of cutter performance has an extremely important influence.

Under such current circumstances, the present inventors focused their attention on Ceramic X as a material for the cutting edge of a shearing cutter.

There are two types of heat-resistant material systems: oxide-based and no-oxide-based.

Well-known examples of the former type include alumina ceramics, Macnesia ceramics, zirconia ceramics, and helial ceramics.

Aluminum-based ceramics, zirconia-based ceramics, etc. have extremely high wear resistance as well as heat resistance. The latter type includes silica ceramics.

There are silicon nitride ceramics, titanium carbide ceramics, etc., and studies are progressing on using them alone or in two-component systems, and in recent years, they have been used as cutting tools by taking advantage of their wear resistance, heat resistance, and toughness. This is a place where you can see a lot.

In addition, attention was paid to the hardness of Ceramimoji, and it has already been widely applied in textile machinery, such as yarn guides, tensors, and washers.

The purpose of its use is to take advantage of its hardness so as not to damage the fibers, and its use in cutting tools, as mentioned above, is to take advantage of its wear resistance and heat resistance.

However, as mentioned above, ceramics also have excellent corrosion resistance, which can be an extremely important characteristic for textile models that do not like the adhesion of machine oil and are affected by water.

The features of the present invention are different from these conventional methods of utilization, in that it utilizes hardness to bring out high cutting performance, uses toughness to bring out excellent wear resistance, and furthermore, Utilizing the feature of strong corrosion resistance without corrosion,
This is due to its long-lasting cutting performance under wet conditions.

The weft thread cutting cutter for handless pre-looms made of ceramic y-pick of the present invention has excellent properties such as durability, corrosion resistance, abrasion resistance, and toughness that cannot be obtained with conventional metal cutters. Therefore, it is highly effective as a cutter for water jet looms.

In addition, air jet cutters that do not use water,
It can be expected to have better effects as a weft cutting force for shuttleless looms such as rapiers, as it has better properties such as wear resistance and toughness than metal cutters.

The effects of the present invention will be explained below based on Examples, but the present invention is not limited thereto.

Example 1 FIG. 2 shows an apparatus for evaluating the durability of materials due to friction with threads in an aqueous system.

The yarn 27 coming out of the yarn feeding cheese 21 passes through a tension device 22 and then passes through each guide 24 and is treated by an aspirator. Here, the yarn to be run is made of 50 denier polyester,
A semi-dull yarn (containing Tie2) with 18 filaments was used and brought into continuous contact with the friction material 25 at a yarn speed of 250 m/min, a tension of 60 g/strand, and a contact angle of 120°.

The state of wear on the material surface is observed after 50 minutes.

A total of four types of friction materials were sampled, including three types with metal surface treatment shown in Table 1 and zirconia ceramics, and the results were compared for their wear conditions.

It is also shown in Table 1.

Table 1: Wear Comparison As is clear from Table 1, no wear phenomenon was observed with ceramics (Sirconia A'), and the other three metal materials showed obvious wear traces, although there were differences in size. Observed.

Since the test time is short, rust cannot be confirmed, but it is clear that the surface treatment is worn and eroded, and after long-term use, the oxidation effect by the water medium progresses, leading to rust.

Example 2 Required energy compared to a conventional heat cutter A shearing cutter made of zirconia ceramics and manufactured in the shape of scissors.In this case, it is also possible to impart abrasive properties to one of the scissors However, in Example 2, a pair of the same material was used.

The loom conditions for comparison are water jet loom A.
, two models from company B, single width 150 and rotation speed 40.
Orpm, weft thread 765C458.

The vertical x horizontal raw material density was 105 x 75 pieces/in red number.

As is clear from the results in Table 2, when using spun yarn, the energy required for the heat cutter is 30% even for relatively fine yarn.
The ratio exceeds 0, making it hard to believe at first glance that this much energy is being expended. It is easy to imagine that a similar result could be obtained by attaching ivy to ceramics on Company B's loom.

In addition, when comparing the water jet looms of Company A, the number of weft yarn cutting errors was 8 to 9 times per million bits (weaving length approximately 400 m) with the conventional heater cutter, but 9 with the present invention. Zirconia ceramics are 4-5
It was times. When considering durability and abrasion resistance from a long-term perspective,9 Even apart from the problem of rust caused by water wetness with ordinary metals, the durability and abrasion resistance decrease, resulting in an increase in miscuts. In this respect, it is considered to have long-term durability.

Expected wear resistance.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the water jet loom mechanism. FIG. 2 shows an apparatus for evaluating the durability of materials due to friction with threads in an aqueous system. 1: Yarn feeding cheese 2: Tension device 3: Pool pipe 5: Gripping device 6: Water tank 7: Jet pump 8: Heat cutter 10: Yarn end treatment system 16: Jet nozzle
17: Weft yarn 18: Warp yarn 21: Yarn supply cheese 23: Water bath 25: Wear material patent applicant Toshi Co., Ltd.

Claims (1)

[Scope of Claims] (1) A cutter for a shuttleless loom, characterized in that the weft cutting blade is made of ceramic. (2) A cutter for a non-woven machine according to claim 1, wherein the weft cutting blade is a water jet loom cutter.