JP5615999B2 - Weft feeding device in fluid jet loom - Google Patents

Description

The present invention relates to a weft feeding device in a fluid jet loom, and more particularly, to a weft feeding device that feeds a weft held between a pair of rollers that are provided upstream of a main nozzle and at least one of which is rotationally driven. The present invention relates to a weft feed device in which the roller is rotationally driven at a peripheral speed of 900 m / min or more.

Examples of the above-described weft feeding device include those described in Patent Documents 1 and 2. The weft feeding device described in Patent Document 1 constitutes a part of the weft length measuring and storing device, and includes a pair of rollers provided on the upstream side of the yarn path of the rotating yarn guide in the weft length measuring and storing device. ing. The weft feeding device described in Patent Document 2 is for assisting the weft insertion by the main nozzle, and is arranged on the upstream side of the weft path of the main nozzle.

Each of the weft feeding devices described in Patent Documents 1 and 2 has a pair of rollers as a main structure, and one roller (drive roller) of the pair of rollers is driven to rotate, and the other roller (driven) The roller) is in pressure contact with the drive roller and is driven to rotate. The pair of rollers feeds the weft yarn between the two rollers, and continuously feeds the weft yarn of one weft insertion length for each rotation of the loom at a peripheral speed corresponding thereto. It is rotationally driven.

In general, in the weft feeding device as described above, at least one of the outer peripheral surfaces of the rollers is made of a rubber-based soft material (urethane rubber (soft rubber) in Patent Document 2) in order to prevent slippage between the two rollers. It is covered with (Example). That is, an annular covering member made of a soft material is fixed to the peripheral surface of the roller (wheel). Further, the roller of the weft feeding device in the loom is made of a ferrous material (iron alloy, cast iron, etc.) as a raw material in consideration of cost and the like, except for the portion covered with the soft material (roller wheel). Things are common.

The rollers in the weft feeding device as described above generally have an outer diameter of around 70 mm. For example, when a loom having a weaving width (through width) of 190 cm (weft insertion length 200 cm) is operated at 800 rpm, the roller is driven to rotate at a high speed of about 1600 m / min. This is a high-speed rotation exceeding 7000 rpm when the outer peripheral diameter of the roller is converted to 70 mm. Note that the loom is operated at 600 rpm even if the rotational speed is low, and the weaving width is 150 cm (weft insertion length≈160 cm) even if the weaving width is narrow. Therefore, the roller is rotationally driven at a peripheral speed of at least 900 m / min.

By the way, in the above-mentioned weft feeder, the problem that a roller breaks frequently occurs during the operation of the loom. Specifically, a phenomenon (detachment phenomenon) occurs in which the covering member made of the soft material is detached from the roller wheel. Such a desorption phenomenon occurs in a few hours when it is short, and when it is long But it happened in a few days. For this reason, the roller to which the covering member is attached has to be frequently replaced, and the operating rate of the loom decreases, and the roller is repaired, the rubber is replaced, and the like, which is a heavy burden in terms of cost.

Conventionally, the cause of the above problem is considered as an adhesive (adhesive or the like) for fixing the covering member to the roller wheel or the fixing surface of both, and various changes have been tried for them. It was not improved. On the other hand, as a result of intensive studies on the occurrence of the above problems, the present inventors have found that the cause is the heat generated in the covering member. Details are as follows.

First, the reason for the generation of heat as described above is that the pair of rollers are in pressure contact with each other because they are driven to rotate at a very high speed as described above. Slip occurs between the roller and the weft, and heat is generated by friction caused by the slip. Further, as the roller rotates, the covering member is repeatedly deformed at the pressure contact portion and then restored, and accordingly, high heat is generated at the pressure contact portion of the roller (covering member). Then, the heat generated in the pressure contact portion is transmitted to the inside of the covering member and the heat is accumulated therein, and the entire covering member is in a state of high heat. As a result, the adhesive agent that fixes the roller wheel and the covering member melts and the bonding function is lost, and the phenomenon that the covering member is detached from the roller wheel with the high-speed rotation described above occurs. Is.

In particular, rubber-based materials (urethane rubber, etc.) that are generally used as the material of the roller covering member in the weft feeding device are very excellent in terms of preventing relative sliding with the weft and in wear resistance. However, since the heat storage property is high and the heat resistance is inferior, the above problem is likely to occur.
JP 63-21955 A JP-A-6-248539

Accordingly, an object of the present invention is to provide a weft feed device used in a fluid jet loom, and to provide a weft feed device that maintains a stable operating state over a long period of time.

The present invention is a weft feeding device used in a fluid jet loom, and is mainly composed of a pair of rollers provided on the upstream side of a weft path from a main nozzle and at least one of which is rotationally driven, and the rollers are 900 m in length. Suppose that the weft feeding device is driven to rotate at a peripheral speed of at least / min and feeds the weft yarn between both rollers.

And in order to solve the above-mentioned problem, a weft feeding device according to the present invention comprises a roller wheel formed from a mechanical part material having at least one of a pair of rollers made of metal and having a higher thermal conductivity than iron, And a covering member formed of a soft material and fixed to the outer peripheral surface of the roller wheel, and the roller wheel has a plurality of outer peripheral surface portions set to two or more different diameters on the outer peripheral surface, and The covering member is formed so that the thickness t thereof is in a range of 2 mm ≦ t ≦ 4 mm, and the joint surface with the roller wheel has a side surface connecting the outer peripheral surface portions having different diameters. The outer peripheral surface portion having the smallest diameter among the plurality of outer peripheral surface portions, the side wall continuous with the outer peripheral surface portion having the smallest diameter and the outer peripheral surface portion connected to the outer peripheral surface portion having the minimum diameter by the side wall. Meanwhile bets to be contactable formed, characterized in that.

Here, “iron” referred to above is so-called pure iron, and its thermal conductivity is approximately 80 W / mk, although there are some errors depending on the measurement method. Note that most of the iron generally used as a material for machine part materials is an iron alloy (steel material) or cast iron. About this iron alloy and cast iron, although it changes with the content, composition, etc., the heat conductivity is a grade comparable to pure iron, or lower than pure iron. Therefore, in the present invention, pure iron (iron) whose thermal conductivity is known is cited as a representative of these iron-based materials (including pure iron, iron alloys (steel materials), cast iron), and the characteristics of the roller wheel in the weft feeder "Machine parts material with higher thermal conductivity than iron is formed as a raw material". Therefore, this feature may be rephrased as forming a mechanical part material having a higher thermal conductivity than that of an iron-based material.

The “machine part material” mentioned above is a material that is generally used for forming a part of a mechanical device and is available at a relatively low cost. Aluminum material, copper material, ceramic material, etc. Silver, titanium (titanium alloy), and the like exist as metal materials, but silver and titanium are expensive and are not suitable as general mechanical component materials. That is, the machine part material referred to in the present invention excludes such expensive metal materials. Incidentally, although the thermal conductivity of pure silver is higher than that of iron-based materials and aluminum-based materials, the thermal conductivity of titanium is much lower than that of iron-based materials.

As described above, among the general mechanical component materials, a typical one as a mechanical component material having a higher thermal conductivity than the iron-based material is an aluminum-based material (particularly, an aluminum alloy). Therefore, in the present invention, the roller wheel is formed from a mechanical part material having a thermal conductivity equal to or higher than that of an aluminum-based material, or is formed from an aluminum-based material. Furthermore, in this invention, the roller wheel has a heat-radiating fin.

In the present invention, the roller covering member is preferably formed such that the width of the thread clamping surface is smaller than the width of the joint surface with the roller wheel. More specifically, the width of the thread clamping surface is set to the roller wheel. And 90% or less of the width of the joint surface.

According to the weft feeding device of the present invention, the wheel portion (roller wheel) is conventionally used for one or both of the rollers to which the covering member of the pair of rollers for sandwiching and feeding the weft is attached. Because it is made of aluminum-based material (or mechanical component material having a thermal conductivity equal to or higher than that of aluminum-based material), which is a mechanical component material with higher thermal conductivity than iron-based material, the pressure contact part of the roller The heat generated and transmitted to the inside of the covering member is promptly transmitted to the roller wheel side without accumulating inside the covering member. This prevents heat from accumulating inside and prevents the covering member from reaching a high temperature, and prevents the covering member from being detached from the roller wheel as much as possible. Can be improved (long life). Since the roller wheel has a higher heat dissipation effect than the covering member, the roller wheel does not become so hot that it affects the state of adhesion with the covering member.

Furthermore, in the weft feeding device of the present invention, since the roller wheel has a structure for dissipating heat, the heat dissipating effect of the roller wheel is enhanced, and accordingly, the transmission from the covering member to the roller wheel is enhanced. Since the thermal efficiency is increased, the amount of heat accumulated inside the covering member can be further reduced to extend the life.

In the weft feeding device of the present invention, the roller wheel has a plurality of outer peripheral surface portions with different diameters set to two or more diameters on the outer peripheral surface, and the covering member includes at least one of the plurality of outer peripheral surface portions and the above-mentioned It is supposed to be in contact with the roller wheel on a surface different from the outer peripheral surface portion, thereby increasing the contact area between the covering member and the roller wheel, and further improving the heat radiation efficiency from the covering member to the roller wheel. While increasing, the adhesive strength between the two can be increased, which is more effective for preventing the desorption phenomenon. Moreover, according to this structure, the lack of the mechanical strength of covering member self-confidence can also be compensated.

According to the weft feeding device of the present invention, when the covering member is formed of a rubber-based material, the inside of the covering member becomes a high temperature state, and the covering member itself is prevented from being damaged. That is, as described above, the rubber-based material has a high heat storage property. Therefore, when it is difficult to release heat, the inside becomes extremely hot, and in some cases, the melting point of the rubber is reached. In that case, the inside melts and the melted part reaches the surface and the surface is partially ruptured, and the covering member may become unusable. Since the inside is prevented from being in a high temperature state, damage due to the high temperature as described above can be prevented.

In addition, since the heat transfer from the covering member to the roller wheel is performed more efficiently as the contact area is larger, it is preferable that the width of the joint surface between the covering member and the roller wheel is larger. On the other hand, the amount of heat generated at the pressure contact portion (thread clamping surface) of the roller increases as the contact area between the two increases. Therefore, the covering member is not formed so that the width of the joining surface with the roller wheel and the width of the yarn clamping surface are substantially equal, but the width of the yarn clamping surface is smaller than the joining surface, more preferably, By setting the width of the yarn clamping surface to 90% or less of the width of the joint surface, the life of the roller can be further extended.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. Hereinafter, a case where the weft feeding device according to the present invention is applied to a weft length measuring storage device of a water jet loom will be described. However, the weft feeding device of the present invention is not limited to the one applied to such a weft length measuring and storing device, and for example, the weft feeding device described in the above-mentioned Patent Document 2 or the like in other fluid-jet looms. It is also possible to apply as a weft feeder.

In the weft length measuring and storing device 2, the weft Y is wound by the rotary motion of the length measuring portion 7 as a weft feeding device including a pair of rollers 4 and 5 that are rotationally driven by the main shaft 3 of the loom 1 and the rotating yarn guide 21. And a storage portion 20 including a stationary storage drum 23 that stores the weft Y until it is inserted.

The weft Y is supplied from the yarn feeder 10 and supplied to the length measuring unit 7 through the guide 11. In the length measuring unit 7, the weft Y is sandwiched between the pair of rollers 4 and 5, and the weft Y is sent out toward the rotating yarn guide 21 by the rotation of the rollers 4 and 5.

Of the pair of rollers 4 and 5 in the length measuring unit 7, one roller 5 is for length measurement. The length measuring roller 5 has a pulley 16 (FIG. 2) provided at its shaft portion coupled to a pulley 13 by a belt 14 such as a timing belt. The pulley 13 is rotationally driven by the main shaft 3. Accordingly, the length measuring roller 5 is rotationally driven by the pulley 13 in synchronization with the main shaft 3. Further, the other roller 4 is provided so as to be able to contact with and separate from the length measuring roller 5 by a support mechanism (not shown). During weaving, the roller 4 is in a pressure contact state with the length measuring roller 5 and is driven to rotate as the length measuring roller 5 rotates (hereinafter, the roller 4 is referred to as a “driven roller”). . Further, the belt 14 is also wound around a pulley 25 attached to the shaft 22 of the rotating yarn guide 21, and the rotating yarn guide 21 is also rotated in synchronization with the main shaft 3.

In this way, in the illustrated weft length measuring and storing apparatus 2, during weaving, the weft Y is continuously sent out from the length measuring section 7 in accordance with the rotational speed of the length measuring roller 5. The rotational speed of the length measuring roller 5 is set so that the weft Y having a weft insertion length is sent out during one weaving cycle of the loom 1. In the illustrated example, the length measuring roller 5 of the pair of rollers 4 and 5 is driven to rotate, and the driven roller 4 is driven to rotate by pressure contact with the length measuring roller 5. 5 may be rotationally driven in synchronization with each other.

The reservoir 20 includes a locking pin 24. The locking pin 24 is driven to advance and retreat with respect to a hole (not shown) formed in the storage drum 23 by a driving means 26 such as a solenoid. Then, when the locking pin 24 advances toward the hole of the storage drum 23, the weft Y is locked by the locking pin 24 and wound around the storage drum 23. Further, when the locking pin 24 retracts from the hole of the storage drum 23 at the weft insertion start timing, the locked state of the weft Y is released, and the weft Y in the storage state wound around the storage drum 23 is released.状態 It will be possible. Then, the weft Y inserted from the storage unit 20 through the guide 35 and the clamper 33 to the main nozzle 31 is inserted by injection of fluid (water) from the main nozzle 31.

Incidentally, in the illustrated weft length measuring and storing device 2, the weft Y stored in the storage drum 23 is shorter than the weft length used for one weft insertion. That is, as described above, the weft 7 having a weft insertion length of one time is sent out from the length measuring unit 7 during one weaving cycle, whereas the weft Y is stored on the storage drum 23. Is between the time when weft insertion is completed and the start of the next weft insertion. Accordingly, during the weft insertion period, the weft Y is first unwound after the weft Y on the storage drum 23 is unwound (free-flying), and then the weft Y fed from the length measuring unit 7 is the rotating yarn. A state in which the main nozzle 31 is directly connected to the main nozzle 31 through the guide 21 and a weft insertion state (constrained flying) is achieved.

In the pair of rollers 4 and 5 in the length measuring section 7 of the weft length measuring and storing apparatus 2 as described above, in the illustrated example, the driven roller 4 is formed of a soft elastic material on the outer peripheral surface. That is, the driven roller 4 is composed of a metal roller wheel 4a made of a machine part material and an annular covering member 4b made of a soft material fixed to the outer peripheral surface of the roller wheel 4a. As described above, the purpose of making the outer peripheral portion of the roller in the weft feeding device such a soft material is to increase the frictional resistance against the weft Y, and to prevent relative slip between the weft Y and the roller as much as possible. However, the length measurement of the weft Y is to be made more accurate.

As a material of the covering member used for the roller of this weft feeding device, for example, a rubber-based material, particularly urethane rubber can be cited as a typical example. This urethane rubber is used as a weft feed roller for looms in consideration of the anti-slip of weft Y, wear resistance, and the influence of chemicals such as glue on the surface of weft Y. It is the best to do. However, the soft material for forming the covering member in the present invention is not limited to this urethane rubber, and may be other rubber materials, or other soft materials other than the rubber materials. It may be. In the illustrated example, only the driven roller 4 of the pair of rollers 4 and 5 is formed of a soft material on the outer periphery, but the length measuring roller 5 has the same configuration as the driven roller 4. Also good.

And in this invention, the roller wheel (follower roller 4) which comprises the roller (follower roller 4) to which the coating | coated member (4b) of the pair of rollers (4, 5) in a weft feeder (length measuring part 7) was attached. 4a) is formed of a machine part material having a higher thermal conductivity than an iron-based material (iron) generally used in a roller in a conventional weft feeder.

<Example 1>
Here, iron-based materials (iron: thermal conductivity ≈ 80 W / mK), aluminum-based materials (aluminum: thermal conductivity ≈ 237 W / mk), copper-based materials (copper: thermal conductivity) that are generally used as machine part materials A roller wheel is formed at a rate of approximately 398 W / mk), and when the roller wheel is used as the driven roller 4 of the length measuring unit 7 in the above-described weft length measuring storage device 2, a durability test was performed. A description 36 will be given based on the results.

In this test, the driven roller 4 having an outer diameter of 65 mm and a coating member 4b made of urethane rubber having a thickness of 3.5 mm (outer diameter of the roller wheel 4a: 58 mm) is used. It was. In the water jet loom having a thread width of 170 cm, in order to shorten the test time, the rotational speed of the loom is set to 2000 rpm (roller peripheral speed: 3400 m / min) which is much higher than the practical level. A test was conducted in which the loom was operated continuously over time.

As a result of this test, in the driven roller 4 in which the roller wheel 4a was formed of an iron-based material, the detachment phenomenon of the covering member 4b from the roller wheel 4a occurred in only about 8 hours. On the other hand, in the driven roller 4 in which the roller wheel 4a is formed of an aluminum material, the detachment phenomenon of the covering member 4b did not occur until about 200 hours. Further, the driven roller 4 in which the roller wheel 4a is formed of a copper-based material exhibited the detachment phenomenon of the roller wheel 4a in about 170 hours in this test.

From the above test, it can be seen that when the roller wheel 4a is made of an aluminum material, the durability is increased by about 25 times compared to the case where the roller wheel 4a is made of an iron material. It can also be seen that the durability increased by 20 times or more even in the case of the copper-based material as compared with the iron-based material. Thus, in a weft feeding device in which a pair of rollers are driven to rotate at high speed, a wheel portion (roller wheel) of a roller to which a soft covering member is attached in order to prevent relative sliding with the weft is generally used. Instead of the iron-based materials that are used in general, the durability of the machine-part materials can be significantly improved by forming a machine part material having a higher thermal conductivity than the iron-based materials. That is, according to the weft feeding device for a fluid jet loom according to the present invention, the durability can be significantly improved as compared with the conventional device, and the cost increases due to the lowering of the operating rate of the loom and the repair of the roller. The effect that it can prevent is acquired.

In the above test, it can be seen that the driven roller 4 in which the roller wheel 4a is made of a copper-based material having a higher thermal conductivity than the aluminum-based material is inferior in durability. This is considered to be related to the specific gravity of the material (aluminum: specific gravity≈2.7 g / cm ³ / copper: specific gravity≈10.5 g / cm ³ ). The details are as follows.

The main shaft 3 of the loom does not always rotate at a constant rotational speed, and rotation unevenness of about ± 10% with respect to the average rotational speed is generated during one rotation due to a load associated with the opening motion. Along with this, rotation unevenness also occurs in the length measuring roller 5 of the length measuring section 7 that rotates in synchronization with the main shaft 3, and slight acceleration / deceleration occurs during one weaving cycle. Along with the acceleration / deceleration, relative slip occurs between the peripheral surfaces of the pressure contact portions of the pair of rollers 4 and 5, and heat is generated due to friction accompanying the slip. Since the slip between the circumferential surfaces of both the rollers 4 and 5 is due to the influence of inertia, the amount varies depending on the weight of the roller, and the amount of heat generation also varies. Therefore, when the roller wheel 4a is formed of a material having a large specific gravity, the weight of the roller wheel 4a increases, and accordingly, the amount of heat generated at the pressure contact portion between the rollers 4 and 5 increases. Therefore, when the roller wheel 4a is formed of a copper-based material, although the heat conductivity is higher than that of the aluminum-based material, the calorific value is larger than that formed of the aluminum-based material due to the weight of the roller wheel 4a. As a result, the durability is slightly inferior.

However, when compared only with the specific gravity of the material, the iron-based material (iron: specific gravity ≈ 7.87 g / cm ³ ) is smaller than the copper-based material. Is overwhelmingly expensive. Considering these facts, when the thermal conductivity of the machine part material forming the roller wheel 4a is sufficiently higher than that of the iron-based material (when it is equal to or higher than that of the aluminum-based material), the difference in the thermal conductivity is more durable. There is no difference in sex, and in that case, the effect of specific gravity is considered to be significant. On the other hand, in the range of general mechanical component materials, ferrous materials and the above mechanical component materials having sufficiently higher thermal conductivity are not limited to high mechanical conductivity materials, regardless of the specific gravity. If the roller wheel 4a is formed, the life can be extended.

For reference, in relation to the above-described test results, the above-mentioned looms operating at a practical level in the weaving factory (for example, weft insertion rate (weft insertion length x loom rotation speed) ≒ 1700 m / min) When the driven roller 4 using the iron-based material used in the above test as the raw material of the roller wheel 4a and the driven roller 4 using the aluminum-based material as the raw material of the roller wheel 4a are attached to the weft feeder, the iron-based material is used. In the case of the material, the detachment phenomenon of the covering member 4b occurred within a few days to about two weeks, whereas the detachment phenomenon of the covering member 4b did not occur until nearly one year in the case of the aluminum-based material.

<Example 2>
In this embodiment, not only the material of the roller wheel 4a according to the first embodiment but also the width of the yarn clamping surface 4b1 of the driven roller 4 is noted, and the difference in durability when the width is changed will be described. In the following description, as an example of the driven roller 4, a roller wheel 4a formed of an aluminum-based material is used, and a plurality of the rollers having different widths of the yarn clamping surface 4b1 in the driven roller 4 are durable. The results of the sex test will be described.

More specifically, the roller wheel 4a having a width L0 of the outer peripheral portion 4a1 of 16.5 mm, and a covering member 4b made of urethane rubber, the end surface of the roller wheel 4a side (= the roller wheel 4a). A driven roller 4a (FIG. 3) comprising a covering member 4b having a width of the joining surface 4b2) equal to the width L0 of the outer peripheral portion 4a1 of the roller wheel 4a is used, and the width of the yarn clamping surface 4b1 of the covering member 4b. L1 is formed to be equal to L0 as shown in FIG. 3 (a), and as shown in FIG. 3 (b), chamfering is performed on both sides of the outer peripheral side of the covering member 4b to make it smaller than L0. Each formed product was subjected to a durability test. FIG. 3A shows the same driven roller 4 as described in the first embodiment assuming that the roller wheel 4a is made of an aluminum-based material. Moreover, about what was shown in FIG.3 (b), the test was each done about three types, L1 = 16mm, 15mm, and 14mm. And the loom used for the test and its operating conditions were the same as those in Example 1 described above.

As a result of the above test, the driven roller 4a (width L1 of the thread clamping surface 4b1 = width L0 of the joining surface 4b2) shown in FIG. 3A is covered in about 200 hours as described in the first embodiment. The detachment phenomenon of the member 4b occurred. Further, among the driven rollers 4a having the width L1 of the yarn clamping surface 4b1 <the width L0 of the joining surface 4b2 shown in FIG. 3B, those having L1 = 16 mm are the same as those shown in FIG. The detachment phenomenon of the covering member 4b occurred with time.

On the other hand, when L1 = 15 mm, the detachment phenomenon of the covering member 4b does not occur until about 230 hours, and when L1 = 14 mm, the detachment phenomenon of the covering member 4b occurs during the test (240 hours). I did not. Incidentally, the yarn clamping surface 4b1 with L1 = 15 mm is about 90% wider than the joint surface 4b2 with L0 = 16.5 mm.

And about this test result, also about the roller wheel 4b from which the width | variety (L0) of the joint surface 4b2 differs from the above, it is the same tendency in the ratio of the width L1 of the thread clamping surface 4b1 and the width L2 of the joint surface 4b2 of the roller wheel 4a. was gotten. Therefore, by setting the width of the yarn clamping surface 4b1 in the covering member 4b to 90% or less of the width of the joint surface 4b2 with the roller wheel 4a, a higher effect on durability can be obtained.

The amount of heat generated at the pressure contact portion between the rollers 4 and 5 is proportional to the width of the yarn clamping surface 4b1. Further, the width of the joint surface 4b2 of the covering member 4b with the roller wheel 4a, that is, the width of the outer peripheral portion 4a1 of the roller wheel 4a is also determined according to the size of the width of the roller wheel 4a (particularly the outer peripheral portion 4a1). And the influence of inertia changes, the amount of heat generated is proportional to the width of the outer peripheral portion 4a1. Accordingly, when the width of the yarn clamping surface 4b1 is set at a ratio to the width of the joining surface 4b2, increasing the width of the joining surface 4b2 with the same ratio will increase the amount of heat accumulated in the covering member 4b. Seem. However, if the width of the joint surface 4b2 is increased, the amount of heat transferred from the covering member 4b to the roller wheel 4a is increased, so that the amount of heat accumulated in the covering member 4b is not necessarily increased. According to the test in the present embodiment, in the roller wheel 4a having a different width of the joint surface 4b2, even when the width of the yarn clamping surface 4b1 is set at the same ratio to the width of the joint surface 4b2, The same effect can be obtained by the relationship with the heat transfer amount from the covering member 4b to the roller wheel 4a.

Incidentally, with regard to the width of the yarn clamping surface 4b1, in the case where the weft is clamped and fed between a pair of rollers as in the weft feeding device of the present invention, the weft clamping position between the rollers (the weft in the width direction of the roller) If the (passing position) is always constant, the roller must be replaced early due to uneven wear. Therefore, in general, the above-mentioned uneven wear is prevented by traversing the weft in the width direction of the roller. Further, the amount (width) of the traverse (of course, it is performed within the range of the yarn pinching surface 4b1 of the roller) is preferably larger when only wear is considered, and if it is smaller, the wear is increased accordingly. The degree will advance. Therefore, the width of the roller yarn clamping surface 4b1 is preferably set to 13 mm or more in consideration of the allowable degree of progress of wear.

In the above description, the driven roller 4 used in the test has been described only for the test using the driven roller 4 in which the roller wheel 4a is formed of an aluminum material. However, the roller wheel 4a is made of a copper-based material as another mechanical component material. In the test using the driven roller 4 formed with the same, the same tendency with respect to durability was obtained.

<Example 3>
In this embodiment, the thickness of the covering member 4b in the driven roller 4 is further noted, and the difference in durability when the thickness is changed will be described. In the following description, the roller roller 4a is made of the driven roller 4 made of an aluminum-based material as an example, and a durability test is performed on a plurality of the roller rollers 4 having different thicknesses of the covering member 4b. The results are described.

More specifically, in the above test, the driven roller 4 used in the above-described second embodiment has a thread clamping surface 4b1 having a width of 15 mm, and the covering member 4b has a wall thickness t (FIG. 3). Each of the driven rollers 4 formed at 5 mm, 4.5 mm, 4 mm, 3 mm (t = 3.5 mm in the driven rollers 4 of Examples 1 and 2) was tested for durability. The outer peripheral diameter of each driven roller 4 is 65 mm as described in the first embodiment. In addition, the loom used for the test and its operating conditions were the same as those in Examples 1 and 2.

As a result of the test, as described in Example 2 above, with respect to the case where the thickness of the covering member 4b was set to t = 3.5 mm, the separation phenomenon of the covering member 4b did not occur until about 230 hours. Further, even when t = 4 mm, the detachment phenomenon of the covering member 4b did not occur until about the same time as t = 3.5 mm. Furthermore, for the case where t = 3 mm or less, the separation phenomenon of the covering member 4b did not occur during the test (240 hours).

On the other hand, when the thickness of the covering member 4b is t = 4.5 mm, the detachment phenomenon of the covering member 4b occurs in about 160 hours, and in the case where t = 5 mm, the covering member 4b has a thickness of about 70 hours. A withdrawal phenomenon occurred. In either case, it can be said that the roller wheel 4a has sufficiently high durability as compared with the roller wheel 4a made of an iron-based material, but the durability is inferior compared with that in which t = 4 mm or less. And when considering the operation at a practical level, it can be said that the thickness t ≦ 4 mm of the covering member 4b is a more preferable range.

In the weft feeding device that feeds the weft Y between the pair of rollers 4 and 5 with respect to the wall thickness of the covering member 4b, the driven member is driven in order to eliminate relative slip between the roller and the weft Y as described above. It is desirable that the roller 4 is brought into pressure contact with the length measuring roller 5 and the covering member 4b is deformed at the pressure contact portion to increase the thread gripping force by the covering member 4b. Therefore, the covering member 4b becomes difficult to be deformed when the thickness thereof is made too thin, and the weft Y tends to slip. Therefore, the thickness t of the covering member 4b needs to be t ≧ 1.5 mm, and more preferably t ≧ 2 mm. Therefore, by setting the thickness t of the covering member 4b in the range of 2 mm ≦ t ≦ 4 mm, a higher effect on durability can be obtained without excessive slippage of the weft Y.

In the above description, only the test using the driven roller 4 having the width of the yarn clamping surface 4b1 of 15 mm has been described. However, the same tendency is seen in the results of the tests with different widths of the yarn clamping surface 4b1. It was. Therefore, when conditions other than the thickness of the covering member 4b (outer diameter D, width L0 of the roller wheel 4a, width L1 of the thread clamping surface 4b1, etc.) are fixed, the thickness of the covering member 4b It can be said that a higher effect can be obtained by setting the thickness to 4 mm or less.

Considering the result of the test in Example 2 described above, if the thickness of the covering member 4 is 4 mm or less (2 mm or more), the durability that can be satisfied at a practical level regardless of the width of the yarn clamping surface 4b1. Sexuality will be obtained. Furthermore, when the width of the yarn clamping surface 4b1 is 90% or less in terms of the ratio to the width of the joint surface 4b2, higher durability can be obtained.

Moreover, in the said test, the outer peripheral diameter of a driven roller is set to the same thing, and the test is done. Since the peripheral speed of the pair of rollers 4 and 5 is determined in accordance with the feed speed of the weft Y, the rotational speed of the driven roller 4 depends on the diameter thereof. That is, the larger the outer diameter, the lower the rotational speed, and the smaller the outer diameter, the higher the rotational speed. It is also clear that with a roller having the same configuration, the lower the number of rotations, the smaller the amount of heat that accumulates in each part of the covering member 4b and the greater the durability. Therefore, when the roller wheel 4a of the driven roller 4 having a larger diameter than that of the third embodiment is adopted, the rotational speed is lowered, and high durability can be obtained even if the wall thickness is further increased. Seem. However, when the diameter of the roller wheel 4a is increased, the number of rotations is reduced, but the weight of the roller wheel 4a and the covering member 4b is increased, so that the influence of inertia increases and the amount of heat generated at the press contact portion increases. Therefore, the durability is not necessarily improved by increasing the diameter of the driven roller 4, and it can be said that the thickness t is preferably in the range of t ≦ 4 mm.

However, when the influence of the inertia described above is small due to a low rotation speed of the loom or the like, the durability may change due to a change in the outer peripheral diameter of the driven roller 4a. That is, when the rotation speed is decreased by increasing the diameter of the driven roller 4a, the durability may be increased even if the thickness of the covering member 4b is the same. In that case, even if the thickness of the covering member 4b is greater than the thickness t = 4 mm described in the third embodiment, sufficient durability can be obtained. Therefore, for those which are considered to be less influenced by inertia, based on the test results of Example 3 above, suitable values of the outer peripheral diameter D (= 65 mm) of the driven roller 4 and the wall thickness t of the covering member 4b ( From the ratio (D / t) to t ≦ 4), the thickness of the covering member 4a may be set so as to satisfy D / t> 16. Even in that case, satisfactory durability can be obtained at a practical level.

In addition to the examples described above, the present invention can employ the following embodiments.

(1) In Example 2 described above, as shown in FIG. 3 (b), the covering member 4b has a width (L1) of the yarn clamping surface 4b1 smaller than the width (L0) of the joining surface 4b2. Although the chamfering is performed on both sides on the outer peripheral side of 4b, instead of this, R (R) chamfering may be performed as shown in FIG. 4 (a). Further, instead of the side portion changing in the middle, such as chamfering or rounding, as shown in FIG. 4 (b), the side portion of the covering member 4b is a straight line between the joining surface 4b2 and the yarn clamping surface 4b1. It is good also as what is formed so that it may connect.

However, as shown in FIG. 3 (a) and FIG. 4 (b), when the shape has a substantially right angle corner on the contact surface (thread clamping surface 4b1) side with the length measuring roller 5, There arises a problem that the corner portion repeatedly deforms and breaks with the press contact with the length measuring roller 5. Specifically, in the yarn clamping portion (pressure contact portion) between the rollers 4 and 5, the covering member 4b is deformed by being pressed against the length measuring roller 5, and the deformed portion is pressed by the rotation of the driven roller 4. It escapes from the part and returns from the deformed state. This is repeated for each rotation of the driven roller 4. At the time of deformation accompanying the press contact, the stress is most concentrated on the corner, and the corner is deformed the most. Therefore, in each part of the covering member 4b, the corner is greatly deformed each time the driven roller 4 is rotated, and then the state where the corner is restored is repeated, whereby the corner is damaged.

On the other hand, in the case where the corner is chamfered or rounded, stress concentration is prevented and the partial breakage as described above is difficult to occur. It can be said that the chamfered part also has a corner part, but the corner part has a larger angle than that without chamfering, so the stress concentration is dispersed and the amount of deformation at the corner part is small, and the corner part is damaged. The possibility of is low. In addition, in the case of R removal, the partial deformation as described above is slight, and the possibility of breakage is further reduced.

(2) A fin for heat dissipation is formed on the roller wheel 4a. According to this structure, the heat dissipation efficiency of the roller wheel 4a increases, and accordingly, the heat transfer efficiency from the covering member 4a to the roller wheel 4a increases. As a result, the amount of heat accumulated inside the covering member 4a becomes smaller, and the durability of the driven roller 4 can be further improved. Here, the fins for heat dissipation are a roller wheel 4a comprising an outer peripheral part 4a1 corresponding to the width of the covering member 4b, a shaft part 4a2 including a rotating part, and a support part 4a3 connecting the outer peripheral part 4a1 and the shaft part 4a2. On the other hand, it refers to a plate-like portion (member) formed so as to protrude from a part thereof (for example, the side surface of the support portion 4a3, the inner peripheral surface of the outer peripheral portion 4a1 or the outer peripheral surface of the shaft portion).

The heat dissipating fins are provided at the intermediate portion of the support portion 4a3 between the shaft portion 4a2 and the outer peripheral portion 4a1 of the roller wheel 4a, as indicated by reference numerals 4f1 and 4f1 in FIGS. As shown by reference numerals 4f2 and 4f2 in FIG. 5 (b), it is possible to extend from the end of the outer peripheral portion 4a1 of the roller wheel 4a toward the center side of the roller wheel 4a. The fins 4f1 and 4f2 may be formed integrally with the roller wheel 4a as shown, or may be formed separately and fixed to the roller wheel 4a.

Further, as shown in FIG. 5C, the heat dissipating fins are formed such that the outer peripheral portion 4a1 of the roller wheel 4a is wider than the covering member 4b, and the portions 4f3, 4f3 projecting from the covering member 4b in the width direction. May function as a radiating fin. The fins 4f1, 4f2 and 4f3 may be annular ones extending continuously in the circumferential direction of the roller wheel 4a, or may be formed by a plurality of protrusions intermittently provided in the circumferential direction. It may be a thing.

In addition, according to the structure of the radiation fin shown to Fig.5 (a), the effect of reducing the influence of the heat which generate | occur | produces at the rotation part side is also acquired. That is, since the driven roller 4 is rotationally driven at a high speed, heat is also generated in the rotating portion. The heat generated in the rotating part is transmitted to the support part 4a3 via the shaft part 4a2 of the roller wheel 4a. Since heat generated in the covering member 4b is transmitted from the outer peripheral portion 4a1 side to the support portion 4a3, the support portion 4a3 is likely to be in a relatively high temperature state. When the support portion 4a3 is in a high temperature state, the position corresponding to the support portion 4a3 of the covering member 4b (near the intermediate portion on the inner peripheral portion side) is deformed or damaged due to the influence of the heat. Therefore, by providing a heat dissipation fin 4f1 at the intermediate portion of the support portion 4a3, it is difficult to transfer the heat generated in the rotating portion to the covering member 4b side, and the heat from the covering member 4b side is also dissipated, thereby covering the member. In addition to preventing the detachment phenomenon of 4b, damage to the inner peripheral portion of the covering member 4b as described above can be prevented.

(3) The outer peripheral surface of the roller wheel 4a has a plurality of outer peripheral surface portions set to two or more different diameters, the covering member 4b is in contact with at least one of the plurality of outer peripheral surfaces, and the outer periphery It is set as the structure which contacts the roller wheel 4a in the surface different from a surface part. In addition, the outer peripheral surface part here is a part which forms the outer peripheral surface of the roller wheel 4a. The outer peripheral portion is not necessarily continuous in the circumferential direction, and is a plurality of arc surfaces intermittently present on the circumference of a virtual circle having a certain diameter, and the radius from the center of the roller wheel 4a is equal. Includes a set of arcuate surfaces. Furthermore, even if the outer peripheral portion is not continuous in the width direction of the roller wheel 4a, one having the same diameter is defined as a part of one outer peripheral surface portion.

In the example shown in FIG. 6, the roller wheel 4 a is an aggregate of a plurality of circular arc surfaces whose outer peripheral surfaces are located on the circumferences of two virtual circles A and B (diameter: A <B) having different diameters. The two outer peripheral surface portions 4aA and 4aB are formed. The outer peripheral surface portions 4aA and 4aB are formed with the same diameter in the width direction of the roller wheel 4a. The covering member 4b is formed in a shape in which the joint surface 4b2 coincides with the outer peripheral surface of the roller wheel 4a. As shown in the figure, the joint surface 4b2 of the covering member 4b is not only the two outer peripheral surface portions 4aA and 4aB of the roller wheel 4a, but also a surface connecting the outer peripheral surface portions 4aA and 4aB (intersects with the outer peripheral surface portions 4aA and 4aB). The surface of the direction). Therefore, in the example shown in the figure, the covering member 4b and the roller wheel 4a are fitted with their concavo-convex surfaces aligned when viewed from the side.

In the example shown in FIG. 7A, the roller wheel 4a has an outer peripheral surface portion 4aC and an outer peripheral surface portion including two outer peripheral surface portions 4aD and 4aD having different diameters from the outer peripheral surface portion 4aC. In the example shown in FIG. 7B, an outer peripheral surface portion composed of a plurality of (six in the illustrated example) outer peripheral surface portions 4aE formed with the same diameter and a plurality of (with a larger diameter than the outer peripheral surface portion 4aD ( In the illustrated example, the outer peripheral surface portion is composed of seven outer peripheral surface portions 4aF. The two outer peripheral surface portions 4aD and 4aD in FIG. 7A and the outer peripheral surface portions 4aE and 4aF in FIG. 7B are not continuous in the width direction of the roller wheel 4a but have the same diameter. The plurality of outer peripheral surface portions define one outer peripheral surface portion. In any of the examples, the joint surface 4b2 of the covering member 4b is formed in a shape that matches the outer peripheral surface of the roller wheel 4a. In addition to the outer peripheral surface portions 4aC, 4aD, 4aE, and 4aF, a small-diameter outer peripheral surface portion. 4aC and 4aE are also in contact with the side surfaces (surfaces in the direction intersecting with the outer peripheral surface) connecting the large-diameter outer peripheral surface portions 4aD and 4aF, and are joined to the roller wheel 4a.

According to these configurations, since the contact area between the roller wheel 4a and the covering member 4b is increased, the heat radiation efficiency from the covering member 4a to the roller wheel 4b is further increased, and the adhesive strength between the two can be increased. Further, since the covering member 4b is held by the surface in the direction intersecting with the outer peripheral surface, it is possible to compensate for the insufficient mechanical strength of the covering member 4b.

6 and 7, the roller wheel 4a has two outer peripheral surface portions having different diameters on the outer peripheral surface, but the outer peripheral surface portion formed on the roller wheel 4a has three or more different diameters. It may be a thing. For example, in the example of FIG. 7B, all the outer peripheral surface portions 4aE (or 4aF) have the same diameter, but they may be formed to have different diameters on the center side and the side surface side.

In the examples of FIGS. 6 and 7, the covering member 4b is in contact with all the outer peripheral surface portions at the joint surface 4b2, but not limited to this, as shown in FIG. You may comprise so that it may contact only one and it may contact with surfaces other than an outer peripheral surface part with it.

Specifically, in the example shown in FIG. 8A, the roller wheel 4a has an outer peripheral surface portion 4aG and an outer peripheral surface portion 4aH having a larger diameter than the outer peripheral surface portion 4aG on the outer peripheral surface thereof. However, the covering member 4b is only in contact with the outer peripheral surface portion 4aG and is not in contact with the outer peripheral surface portion 4aH with respect to the outer peripheral surface portion. However, in the illustrated configuration, the covering member 4b comes into contact with the inwardly facing inner surface 4aJ formed on the roller wheel 4a and the surface 4aK facing the outer circumferential surface 4aG, in addition to the outer circumferential surface 4aG. In the example shown in FIG. 8B, the roller wheel 4a has an outer peripheral surface portion 4aM and an outer peripheral surface portion 4aN having a larger diameter than the outer peripheral surface portion 4aM. However, as for the outer peripheral surface portion, the covering member 4b is in contact with only the outer peripheral surface portion 4aM, and is not in contact with the outer peripheral surface portion 4aN. However, in the illustrated configuration, the covering member 4b is in contact with the inner surface 4aP facing inwardly formed on the roller wheel 4a in addition to the outer peripheral surface portion 4aM. Moreover, the inner side surface 4aP is formed so that the area thereof is larger than the area of the outer peripheral surface portion 4aN.

In the example of FIG. 8 as well, the contact area between the roller wheel 4a and the covering member 4b is increased, and the covering member 4b is held on the surface intersecting the outer peripheral surface. The effect is obtained.

(4) The support portion 4a3 of the roller wheel 4a has a blade shape as shown in FIG. According to this configuration, as the driven roller 4 rotates, air actively passes through the roller wheel 4a, and the heat dissipation effect of the roller wheel 4a can be enhanced.

The present invention is not limited to any of the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.

The perspective view which shows one Embodiment of this invention. The perspective view which shows the principal part of one Embodiment of this invention. The front sectional view showing the important section of one embodiment of the present invention. The front sectional view showing the important section of one embodiment of the present invention. Front sectional drawing which shows the principal part of other embodiment of this invention. The side view which abbreviate | omitted one part which shows other embodiment of this invention. Front sectional drawing which shows the principal part of other embodiment of this invention. Front sectional drawing which shows the principal part of other embodiment of this invention. The perspective view which shows other embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 Weaving machine 2 Weft measurement and storage apparatus 3 Main shaft 4 Roller (driven roller)
4a Roller wheel 4a1 Outer part 4a2 Shaft 4a3 Support 4b Cover member 4b1 Thread clamping surface 4b2 Joining surface 5 Roller (length measuring roller)
7 Length measuring section 10 Yarn supply body 16 Pulley 20 Storage section 21 Rotating yarn guide 23 Storage drum 31 Main nozzle

Claims (2)

A weft feeding device that feeds a weft thread between a pair of rollers that are provided upstream of the main nozzle and at least one of which is rotationally driven. The roller is driven to rotate at a peripheral speed of 900 m / min or more. In the weft feeding device to be
At least one of the pair of rollers is a mechanical part material that is made of metal and has a thermal conductivity higher than that of iron, and is made of an aluminum-based material or a mechanical part material having a thermal conductivity equal to or higher than that of the aluminum-based material. The formed roller wheel and a covering member formed of a soft material and fixed to the outer peripheral surface of the roller wheel,
The roller wheel has a plurality of outer peripheral surface portions set to two or more different diameters on the outer peripheral surface and side surfaces connecting the outer peripheral surface portions having different diameters, and has fins for heat dissipation.
The covering member is formed so that a thickness t thereof is in a range of 2 mm ≦ t ≦ 4 mm, and a joint surface with the roller wheel has a smallest diameter with a smallest diameter among the plurality of outer peripheral surface portions. A fluid-jet loom characterized by being formed so as to be able to contact at least one of an outer peripheral surface part and a side wall continuous with the outer peripheral surface part of the minimum diameter and a peripheral surface part connected to the outer peripheral surface part of the minimum diameter by the side wall Weft feeding device. The covering member is formed such that the width of the thread clamping surface is smaller than the width of the bonding surface with the roller wheel, and the width of the thread clamping surface is 90% or less of the width of the bonding surface.
The weft feeding device in a fluid jet loom according to claim 1.

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