TWI414656B - The weft feeding device of the fluid jet loom - Google Patents

Abstract

The invention relates to a weft supply device for fluid jet looms, which is arranged on an upstream side position nearer to a weft path than a main nozzle, and uses a pair of rollers rotatably driven by at least one roller as the main structure, wherein the two roller are driven at a circumferential velocity of more than 900m/min. The invention provides a weft supply device capable of operating stably for a long time. The weft supply device is characterized in that at least one of the pair of rollers is composed of a roller wheel made of metal and a coating member made of soft material and stuck to the outer circumference surface of the roller wheel, and the roller wheel is made of a mechanical part material having a thermal conductivity higher than that of ferrum.

Description

Weft feeding device for fluid jet loom

The present invention relates to a weft feeding device for a fluid jet type loom, and more particularly to a position where an upstream side of a weft path is further than a main nozzle and a weft is held between a pair of rollers that are rotationally driven by at least one roller, and The above-described roller is rotated at a peripheral speed of 900 m/min or more to drive the weft feeding device.

Examples of the weft feeding device include the devices described in Patent Documents 1 and 2. The weft feeding device described in the patent document 1 (Japanese Laid-Open Patent Publication No. SHO63-21955) is a device constituting a part of the weft length measuring storage device, which is provided upstream of the yarn path of the rotary yarn guide provided in the weft length measuring storage device. A pair of rollers on the side is formed. In addition, the weft feeding device described in Japanese Laid-Open Patent Publication No. Hei 6-248539 is an apparatus for assisting the weft insertion by the main nozzle, and is disposed 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, one of the pair of rollers (driving roller) is rotationally driven, and the other roller (driven roller) is crimped by the driven roller. The slave state is rotated. Further, the pair of rollers are fed between the two rollers to feed the weft yarns, and the weft yarns of the weft insertion length are output once at each rotation of the loom, and are continuously rotationally driven at the peripheral speed corresponding thereto.

In the weft feeding device as described above, in order to prevent the sliding of the weft between the two rollers, the outer peripheral surface of at least one of the rollers is made of a rubber-based soft material (a urethane rubber (soft rubber) is exemplified in Patent Document 2) ) coated. That is, a structure in which an annular covering member made of a soft material is bonded to the circumferential surface of the roller (wheel) is formed. Further, in consideration of the cost, etc., the above-described roller of the weft feeding device in the loom is formed of a material (roller) other than the coated portion of the soft material, and is usually formed of an iron-based material (iron alloy, cast iron, or the like) as a raw material. .

Further, the roller in the weft feeding device as described above generally has a peripheral diameter of about 70 mm. Further, when the weaving machine having a woven width (by width) of 190 cm (into the weft length of 200 cm) was run at 800 rpm, the roller was rotationally driven at a high speed of approximately 1600 m/min. When the outer diameter of the above-mentioned roller is 70 mm, this is a high-speed rotation exceeding 7,000 rpm. Moreover, the number of rotations of the loom is also lower at 600 rpm, and the width of the weaving is also narrower than 150 cm (the length of the weft insertion is ≒160 cm). Therefore, the above roller is rotationally driven at least at a peripheral speed of 900 m/min.

However, in the above-described conventional weft feeding device, the problem of roller damage during the operation of the loom frequently occurs. Specifically, a phenomenon in which the covering member made of the soft material is detached from the roller (disengagement phenomenon) occurs, and the detachment phenomenon occurs once in a few hours when the time is short, and also occurs in a few days when the time is long. once. Therefore, it is necessary to frequently replace the roller on which the above-mentioned covering member is mounted, the operation rate of the loom is lowered, and the cost of the roller is also greatly burdened by the repair of the roller and the replacement of the rubber.

Conventionally, it has been considered that the above-mentioned problem is caused by the problem that the coating member adheres to the roller (adhesive or the like) or the bonding surface of the roller, and various modifications have been attempted to them, but the above problems have not been obtained at all. improve. On the other hand, the inventors of the present invention repeatedly conducted intensive studies on the occurrence of the above problems, and found out that the cause is the heat generated in the coated member. The details are as follows.

First, as a cause of heat generation as described above, since the rotational driving is performed at an extremely high speed as described above in a state in which a pair of rolls are pressure-bonded, relative sliding between the two rolls occurs at the crimping portion thereof. The sliding between the roller and the weft is generated by the friction caused by the sliding. Further, with the rotation of the roller, the covering member is repeatedly deformed and then restored in the crimping portion, so that high heat is also generated in the crimping portion of the roller (covering member). Further, the heat generated in the crimping portion is transmitted to the inside of the covering member, and the inside of the covering member is in a state of storing heat therein, and the entire covering member is in a state of high heat. As a result, the adhesive of the bonding roller and the covering member is melted to lose the bonding function, and the coating member is detached from the roller by the high-speed rotation.

In particular, the rubber-based material (polyurethane rubber or the like) generally used as a material for the covering member of the roller in the weft feeding device is excellent in preventing relative sliding with the weft and abrasion resistance, but on the other hand, heat storage is high. Moreover, the heat resistance is poor, so the above problems are liable to occur.

Accordingly, the subject of the present invention relates to a weft feeding device for a fluid jet type loom, which provides a weft feeding device which maintains a stable working state for a long period of time.

The present invention is a weft feeding device for a fluid jet type loom, which is provided as a weft feeding device at a position on the upstream side of the weft path of the main nozzle, and a pair of rollers that rotationally drive at least one roller as a main The structure, and the above roller is rotationally driven at a peripheral speed of 900 m/min or more, thereby outputting the weft by sandwiching between the two rollers.

Further, in order to solve the above problems, in the weft feeding device of the present invention, at least one of the pair of rollers is composed of a metal roller and a covering member formed of a soft material and bonded to the outer circumferential surface of the roller, and The roller is formed by using a mechanical part material having a higher thermal conductivity than iron as a raw material.

Here, the above-mentioned "iron" is so-called pure iron, and its thermal conductivity is approximately 80 W/mk although there is some error according to the measurement method. Moreover, most of the iron used as a raw material for mechanical part materials is iron alloy (steel) or cast iron. Although the iron alloy and the cast iron differ depending on the content and composition thereof, the thermal conductivity is substantially the same as that of pure iron or lower than that of pure iron. Thus, in the present invention, as a representative of these iron-based materials (including pure iron, iron alloy (steel), cast iron), pure iron (iron) having a known thermal conductivity is cited, and the characteristics of the roller in the weft feeding device are "It is formed by a mechanical part material having a thermal conductivity higher than iron as a raw material." Therefore, it can be said that this feature is formed of a mechanical part material having a higher thermal conductivity than the iron-based material as a material.

In addition, the term "mechanical component material" as used herein refers to a material generally used for forming a component of a mechanical device, which can be obtained at relatively low cost, for example, in addition to the above. In addition to the iron-based material, there are also aluminum-based materials, copper-based materials, and ceramic-based materials. Although silver and titanium (titanium alloy) are used as the metal material, silver and titanium are expensive and are not suitable as general mechanical parts. That is, the mechanical part material referred to in the present invention is a material excluding such a high-priced metal material. Incidentally, although the thermal conductivity of pure silver is higher than that of the iron-based material and the aluminum-based material, the thermal conductivity of titanium is extremely low compared to the iron-based material.

As described above, among general mechanical component materials, aluminum-based materials (especially aluminum alloys) are typically used as mechanical component materials having higher thermal conductivity than iron-based materials. Therefore, in the present invention, the roller may be formed of a mechanical component material having a thermal conductivity equal to or higher than that of the aluminum-based material, and may be formed of an aluminum-based material.

Further, in the present invention, it is preferable that the covering member of the roller has a width of the yarn clamping surface formed to be smaller than a width of the bonding surface with the roller, and more specifically, preferably the yarn clamping surface. The width is set to be equal to or less than 90% of the width of the joint surface of the roller. Further, the covering member is preferably formed such that the relationship between the thickness t and the outer peripheral diameter D of the roller is D/t ≦ 16, and is preferably formed in a range of 2 mm ≦ t ≦ 4 mm.

Further, in the present invention, the roller may have a fin for heat dissipation, and the roller has a plurality of outer peripheral surfaces set to have two or more different diameters on the outer peripheral surface thereof, and the covering member is more than the above. At least one of the outer peripheral faces and a face different from the outer peripheral face may be in contact with the roller.

The present invention has the following effects.

According to the weft feeding device of the present invention, one or both of the pair of rollers for gripping and outputting the weft thread are mounted with the covering member, and the wheel portion (roller) has a heat conductivity higher than that of the prior art. Since the mechanical component material having a high iron-based material is formed as a material, the heat generated in the pressure-bonding portion of the roller and transmitted to the inside of the covering member is not stored in the inside and is quickly transmitted to the roller side. Thereby, it is possible to prevent the coating member from being in a high temperature state while storing heat inside, and to prevent the occurrence of the detachment of the covering member from the roller as much as possible, and it is possible to improve the durability of the roller in the weft feeding device (long life). . Moreover, since the roller and the covering member have higher heat dissipation effects, Therefore, a high temperature state which affects the adhesion state of the covering member is not achieved.

Further, the heat transfer from the covering member to the roller is more effectively performed as the contact area is larger, so that the width of the joining surface of the covering member and the roller is larger. On the other hand, the amount of heat generated in the pressure contact portion (yarn clamping surface) of the roller is greatly changed when the contact area between the two is large. Therefore, the covering member is not formed such that the width of the joint surface with the roller and the width of the yarn clamping surface are substantially equal, but the width of the yarn clamping surface is smaller than the joint surface, and more preferably the yarn is The width of the wire clamping surface is 90% or less of the width of the above-mentioned joint surface, so that the life of the roller can be made longer.

Further, by forming the thickness t of the covering member to be thin, and satisfying the relationship D/t ≦ 16 with respect to the outer peripheral diameter D of the roller or in the range of 2 mm ≦ t ≦ 4 mm, it is possible to further reduce the storage. The heat inside the covering member can further achieve a long service life as compared with a thick thickness.

Further, by forming the fins for heat dissipation on the roller, the heat radiation effect of the roller is improved, so that the thermal conductivity from the coating member to the roller is increased, and the amount of heat stored in the interior of the coating member is further reduced. Can achieve long life.

Further, the roller has a plurality of outer circumferential surface portions having different diameters set to have two or more diameters on the outer circumferential surface thereof, and the covering member is at least one of the plurality of outer circumferential surface portions and a surface different from the outer circumferential surface portion and the roller. The wheel contact increases the contact area between the covering member and the roller, and the heat dissipation efficiency from the covering member to the roller is further improved, and the bonding strength between the two can be increased, which is more effective in preventing the above-described detachment phenomenon. Further, according to this configuration, it is possible to compensate for the shortage of the mechanical strength of the covering member itself.

Further, according to the present invention, when the covering member is formed of a rubber-based material, it is possible to prevent the inside of the covering member from being damaged by the high temperature state inside. That is, as described above, since the rubber-based material has high heat storage property, when it is difficult to release heat, the inside is extremely high in temperature, and the melting point of the rubber is reached depending on the case. In this case, the portion which is melted and melted inside and the surface are partially broken in the surface, and the covering member is in an unusable state. In this regard, according to the present invention, the inside of the covering member is prevented from being in a high temperature state, and the accompanying high temperature as described above can also be prevented. Damage.

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

1 to 3 show an embodiment of the present invention. Hereinafter, a case where the weft feeding device of the present invention is applied to a weft length measuring storage device of a water jet type loom will be described. However, the weft feeding device of the present invention is not limited to the use of such a weft length measuring device, and may be applied to other weft feeding devices of a fluid jet type weaving machine such as the weft feeding device described in Patent Document 2, for example.

The weft length measuring storage device 2 has: a pair of rollers 4, 5 which are rotationally driven by the main shaft 3 of the loom 1 as the length measuring portion 7 of the weft feeding device; and a rotary motion included by the rotary yarn guide 21 The storage portion 20 of the stationary storage drum 23 of the weft Y is stored by winding the weft Y and going to the entire period of the weft insertion.

The weft Y is supplied from the yarn supplying body 10, and is supplied to the length measuring portion 7 via the guide 11. In the length measuring portion 7, the weft yarn Y is held by the pair of rollers 4, 5, and the weft yarn Y is output toward the rotary yarn guide 21 by the rotation of the rollers 4, 5.

Of the pair of rollers 4, 5 on the length measuring portion 7, one roller 5 is used for length measurement. The pulley 16 (Fig. 2) provided on the shaft portion of the length measuring roller 5 is connected to the pulley 13 by a belt 14 such as a timing belt. Moreover, the pulley 13 is rotationally driven by the main shaft 3. Therefore, the length measuring roller 5 is rotationally driven in synchronization with the spindle 3 by the pulley 13. Further, the other roller 4 is disposed to be detachable from the length measuring roller 5 by its supporting mechanism (not shown). Further, the roller 4 is in a state of being pressed against the length measuring roller 5 during the weaving, and is driven to rotate in accordance with the rotation of the length measuring roller 5 (hereinafter, the roller 4 is referred to as a "driven roller"). Further, the belt 14 is wound around a pulley 25 attached to the shaft 22 of the rotary yarn guide 21, and the rotary yarn guide 21 is also rotationally driven in synchronization with the spindle 3.

Thus, in the illustrated weft length storage device 2, the weft yaw Y is continuously output from the length measuring unit 7 in accordance with the rotational speed of the length measuring roller 5. Further, the rotational speed of the length measuring roller 5 is set to output the weft Y of the length of the weft insertion once during one knitting cycle of the loom 1. Further, in the illustrated example, the length measuring roller 5 of the pair of rollers 4 and 5 is rotationally driven, and the driven roller 4 is driven by the pressure bonding of the length measuring roller 5. The structure is rotated, but it is also possible to drive the pair of rollers 4, 5 in synchronism.

The storage portion 20 includes a locking pin 24. The locking pin 24 is driven forward and backward with respect to a hole (not shown) formed in the storage drum 23 by a driving mechanism 26 such as a solenoid. Further, the locking pin 24 is moved in and out toward the above-mentioned hole of the storage drum 23, and the weft yarn Y is locked by the locking pin 24 and wound around the storage drum 23. Further, at the start timing of the weft insertion, the locking pin 24 is withdrawn from the hole of the storage drum 23, the locked state of the weft yarn Y is released, and the weft yarn Y wound in the storage drum 23 in the storage state is in the Unlockable state. Further, the weft yarn Y inserted into the main nozzle 31 from the reservoir portion 20 through the guide 35 and the clamp device 33 is fed into the weft by the injection of the fluid (water) from the main nozzle 31.

Incidentally, in the weft measurement storage device 2 shown in the drawing, the weft Y stored on the storage drum 23 is shorter than the length of the weft used for the one-time weft insertion. That is, as described above, with respect to the weft Y which is outputted once from the length measuring portion 7 during one knitting cycle, the storage of the weft Y on the storage drum 23 is from the time when the weft insertion ends to the next weft insertion. The beginning period. Therefore, during the weft insertion, the weft Y is first untwisted by the weft Y on the storage drum 23 and is fed into the weft (free travel), and then, the weft Y outputted from the length measuring portion 7 is directly rotated by the yarn guide 21 In a state of being connected to the main nozzle 31, it is in a state of entering the weft (constrained passage).

In the pair of rollers 4 and 5 on the length measuring portion 7 of the weft length measuring storage device 2 as described above, in the illustrated example, the outer peripheral surface of the driven roller 4 is formed of a soft elastic material. That is, the driven roller 4 includes a metal roller 4a formed of a mechanical component material, and an annular covering member 4b made of a soft material bonded to the outer circumferential surface of the roller 4a. Thus, the purpose of using the soft material in the outer peripheral portion of the roller in the weft feeding device is to increase the frictional resistance to the weft Y in order to prevent the relative sliding of the weft Y and the roller as much as possible, so that the length of the weft Y is measured. The amount is more accurate.

The material of the covering member used for the roller of the weft feeding device may, for example, be a rubber-based material, and particularly as a representative thereof, a urethane rubber. The urethane rubber is most suitable for use in a weft feeding of a loom when considering the influence of preventing the sliding of the weft yarn Y, the abrasion resistance, or the influence of a drug such as a paste adhering to the surface of the weft yarn Y. However, the soft material used to form the covering member of the present invention is It is not limited to this urethane rubber, and may be other rubber-based materials, and may be other soft materials other than rubber-based materials. Further, in the illustrated example, the driven roller 4 of the pair of rollers 4 and 5 is only a member formed of a soft material on the outer peripheral portion thereof, but the length measuring roller 5 may be the same as the driven roller 4. Structure.

Further, in the present invention, the pair of rollers 4, 5 of the weft feeding device (length measuring portion 7) are attached to the roller 4a of the roller (driven roller 4) on one side of the covering member 4b, and the roller The wheel 4a is formed using a mechanical part material having a thermal conductivity higher than that of the iron-based material (iron) generally used in the conventional weft feeding device.

Example 1

Here, iron-based materials (iron: thermal conductivity ≒ 80 W/mk), aluminum-based materials (aluminum: thermal conductivity ≒ 237 W/mk), and copper-based materials (copper: thermal conductivity ≒ 398 W) are generally used as mechanical component materials. Each of /mk) is used to form a roller, and when the roller is used for the driven roller 4 of the length measuring unit 7 in the weft length measuring device 2, the result of the test for durability is explained. .

In the test, as the driven roller 4, a roller having an outer peripheral diameter of 65 mm and a covering member 4b made of polyurethane having a thickness of 3.5 mm (the outer peripheral diameter of the roller 4a: 58 mm) was used. Further, in the water jet type loom having a width of 170 cm, in order to shorten the test time, the number of revolutions of the loom was set to be much higher than the actual level of 2000 rpm (circumferential speed of the roll: 3400 m/min), and 240 hours were performed. A test that continuously runs the loom.

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

From the above test, when the aluminum-based material is used as the material of the roller 4a, the durability is increased by about 25 times as compared with the case of forming the iron-based material. Moreover, it can be seen that in the case of a copper-based material, the durability is also increased by 20 times as compared with the iron-based material. on. In this way, in the weft feeding device in which the pair of rollers are driven at a high speed, the wheel portion (roller) of the roller to which the soft covering member is attached to prevent the relative sliding of the weft is prevented, instead of the iron system generally used in the past. The material is formed of a mechanical part material having a higher thermal conductivity than the iron-based material, and the durability thereof can be remarkably improved. That is, with the weft feeding device of the fluid jet type loom according to the present invention, the durability can be remarkably improved as compared with the conventional apparatus of the related art, and the increase in cost due to the decrease in the operation rate of the loom and the repair of the roller can be prevented. Effect.

Further, in the above test, it is understood that the driven roller 4 in which the roller 4a is formed of a copper-based material having a higher thermal conductivity than the aluminum-based material is more inferior in durability. This is considered to be related to the specific gravity of the raw material (aluminum: specific gravity ≒ 2.7 g/cm ³ , copper: specific gravity ≒ 10.5 g/cm ³ ). The detailed reasons are as follows.

The main shaft 3 of the loom does not always rotate at a constant number of revolutions, but due to a load or the like accompanying the opening motion, a rotation unevenness of about ±10% is generated with respect to the average number of revolutions in one rotation. Further, as a result, unevenness of rotation occurs also in the length measuring roller 5 of the length measuring unit 7 that rotates in synchronization with the main shaft 3, and a slight acceleration/deceleration occurs in one knitting cycle. Then, with the acceleration and deceleration, the circumferential surfaces on the pressure contact portions of the pair of rollers 4 and 5 are relatively slid, and heat is generated by the friction accompanying the sliding. Since the sliding between the circumferential surfaces of the above-mentioned two rolls 4, 5 is caused by the influence of inertia, the amount of heat generation differs depending on the weight of the rolls. Therefore, when the roller 4a is formed of a material having a large specific gravity, the heat generation amount of the roller 4a increases, and the amount of heat generated in the crimping portions of the two rollers 4 and 5 increases. Therefore, when the roller 4a is formed of a copper-based material, the thermal conductivity is higher than that of the aluminum-based material, but the heat generated by the weight of the roller 4a is larger than that of the roller formed of the aluminum-based material, and the result is durable. Slightly reduced.

However, when only the specific gravity of the raw materials is compared, the iron-based material (iron: specific gravity ≒ 7.8 g/cm ³ ) is smaller than the copper-based material, but as described above, the copper-based material is absolutely high in terms of durability. . From these points of view, when the thermal conductivity of the mechanical component material forming the roller 4a is sufficiently higher than that of the iron-based material (when it is equal to or higher than the aluminum-based material), the difference in durability is not caused by the difference in thermal conductivity. At this time, the influence of specific gravity is greater. On the other hand, in the range of general mechanical parts and materials, if the iron-based material and the mechanical component material having a thermal conductivity higher than the above are independent of the specific gravity, it is more preferable to form the roller 4a with a mechanical component material having a high thermal conductivity. Achieve long life.

For reference, in connection with the above test results, the above-described weft feeding device for a loom that operates at a practical level in a weaving factory (for example, a weft insertion rate (into the weft length × loom revolutions) ≒1700 m/min) In the case where the driven roller 4 using the iron-based material used in the above test as the material of the roller 4a and the driven roller 4a using the aluminum-based material as the material of the roller 4a are mounted, the device using the iron-based material is used. The detachment of the covering member 4b occurred in a few days to two weeks, but the detachment of the covering member 4b did not occur until about one year by the device using the aluminum-based material.

Example 2

In the embodiment, the roller 4a according to the above-described first embodiment differs not only in the material but also in the width of the yarn clamping surface 4b1 of the driven roller 4, and the durability in the case where the width is changed. The difference is explained. Further, the roller of the roller 4a made of an aluminum-based material is used as an example of the driven roller 4, and the plurality of rollers having different widths of the yarn clamping faces 4b1 on the driven roller 4 are durable. The results of the test are explained.

In the above test, more specifically, the driven roller 4 (Fig. 3) used includes a roller 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 covering member 4b is formed such that the width of the end surface of the roller 4a side (= joint surface 4b2 with the roller 4a) is equal to the width L0 of the outer peripheral portion 4a1 of the above-described roller 4a, and the yarn clamping surface 4b1 of the covering member 4b is formed. As shown in Fig. 3 (a), the width L1 is formed as a roller equal to the above L0, and as shown in Fig. 3 (b), chamfering is applied to both side portions of the outer peripheral side of the covering member 4b to form L0. The small rolls were tested for their durability. Further, Fig. 3(a) shows the same driven roller 4 as the roller of the roller 4a formed of the aluminum-based material described in the first embodiment. Further, for the rolls shown in Fig. 3(b), three tests of L1 = 16 mm, 15 mm, and 14 mm were carried out. Moreover, the loom used for the test and its operating conditions are The above embodiment 1 is the same.

As a result of the above test, the driven roller 4a (the width L1 of the yarn clamping surface 4b1 = the width L0 of the joint surface 4b2) shown in Fig. 3 (a) is as described in the above-described first embodiment, at 200 The detachment of the covering member 4b occurred around an hour. Further, in the driven roller 4a having the width L1 of the yarn clamping surface 4b1 shown in Fig. 3(b) < the width L0 of the joint surface 4b2, the roller having L1 = 16 mm is as shown in Fig. 3(a). The detachment of the covering member 4b occurred at the same time as the illustrated roller.

On the other hand, in the case of the roller of L1 = 15 mm, the detachment of the covering member 4b did not occur up to about 230 hours, and in the case of the roller of L1 = 14 mm, the detachment of the covering member 4b did not occur during the test period (240 hours). phenomenon. Incidentally, the yarn clamping surface 4b1 of L1 = 15 mm has a width of about 90% with respect to the joint surface 4b2 of L0 = 16.5 mm.

Further, as a result of the test, the width L0 of the joint surface 4b2 and the different roller 4b are also in the ratio of the width L1 of the yarn clamping surface 4b1 to the width L2 of the joint surface 4b2 of the roller 4a. The same tendency was obtained. Therefore, the width of the yarn clamping surface 4b1 on the covering member 4b is made 90% or less of the width of the bonding surface 4b2 of the roller 4a, thereby obtaining an effect of higher durability.

Further, the amount of heat generated in the crimping portions of the two rolls 4, 5 is proportional to the width of the yarn clamping surface 4b1. Further, with respect to the width of the joint surface 4b2 of the covering member 4b with the roller 4a, that is, the width of the outer peripheral portion 4a1 of the roller 4a, the weight of the roller 4a (especially the outer peripheral portion 4a1) changes depending on the width, Therefore, the influence of the inertia changes, and therefore the above-described heat generation amount is also proportional to the width of the outer peripheral portion 4a1. Therefore, when the width of the yarn clamping surface 4b1 is set at a ratio with respect to the width of the joint surface 4b2, it is considered that the width of the joint surface 4b2 is increased at the same ratio, and it is considered that it is stored inside the covering member 4b. The heat will increase. However, when the width of the joint surface 4b2 is increased, the amount of heat transfer from the covering member 4b to the roller 4a is increased. Therefore, it cannot be said that the amount of heat stored in the inside of the covering member 4b is always increased. Further, according to the test of the present embodiment, for the roller 4a having the different widths of the joint faces 4b2, the field of the yarn gripping faces 4b1 is set even at the same ratio with respect to the width of the joint faces 4b2. The same effect is obtained by the relationship between the generated heat and the amount of heat transfer from the covering member 4b to the roller 4a.

Incidentally, in the case of the width of the yarn holding surface 4b1, in the apparatus for feeding the weft between the pair of rollers as in the weft feeding device of the present invention, if the weft is between the rollers The holding position (the position of the weft in the width direction of the roller) is always constant, and the roller must be replaced in advance due to uneven wear. Therefore, in general, uneven wear as described above is prevented by laterally moving the weft in the width direction of the roller. Further, with respect to the amount (width) of the lateral movement, (of course, in the range of the yarn clamping surface 4b1 of the roller), in the case where only the wear is considered, the larger is better, and if it is small, it is only worn here. The degree is aggravated. Therefore, in consideration of the degree of allowable wear, the width of the yarn holding surface 4b1 of the roller is preferably 13 mm or more.

Further, in the above, with respect to the driven roller 4 used in the test, only the test of the driven roller 4 using the roller 4a formed of an aluminum-based material has been described, but the use as a material of other mechanical parts is employed. In the test of the driven roller 4 of the roller 4a formed of the copper-based material, the same tendency was obtained in terms of durability.

Example 3

In this embodiment, attention is paid to the thickness of the covering member 4b on the driven roller 4, and the difference in durability in the case where the thickness is changed will be described. In the following description, the driven roller 4 in which the roller 4a is formed of an aluminum-based material will be described as an example, and the plurality of rollers having different thicknesses of the covering member 4b on the driven roller 4 are made durable. The result of a sexual test.

In the above test, more specifically, a roller having a width of 15 mm of the yarn clamping surface 4b1 in the driven roller 4 used in the above-described Embodiment 2 was used, and the thickness t of the covering member 4b was used (Fig. 3 Each of the driven rollers 4 formed into 5 mm, 4.5 mm, 4 mm, and 3 mm (t = 3.5 mm in the driven rolls 4 of the first and second embodiments) was tested for durability. Further, the outer peripheral diameter of each of the driven rollers 4 was set to 65 mm as described in the above-described first embodiment. Further, the loom used for the test and its operating conditions were the same as those of the above-described first and second embodiments.

As a result of the test, as described in the second embodiment, the roll having the thickness of the covering member 4b of t = 3.5 mm did not cause the detachment of the covering member 4b until about 230 hours. Further, with respect to the roller having t = 4 mm, the detachment of the covering member 4b did not occur until the same time as t = 3.5 mm. Further, in the case where the roll having t = 3 mm or less was not subjected to the detachment of the covering member 4b during the test period (240 hours).

On the other hand, in the roller having the thickness t of the coating member 4b of t = 4.5 mm, the detachment of the covering member 4b occurred in about 160 hours, and in the roller of t = 5 mm, the covering member occurred in about 70 hours. 4b's detachment. It can be said that the durability is sufficiently high as compared with the roller in which the roller 4a is formed of an iron-based material, but the durability is inferior when compared with a roller having a thickness of t = 4 mm or less. Further, in consideration of practical operation, it can be said that the thickness t ≦ 4 mm of the covering member 4b is the best range.

Further, in the weft feeding device for holding the weft yarn Y by the pair of rollers 4, 5 and outputting the thickness of the covering member 4b, as described above, in order to eliminate the relative sliding of the roller and the weft yarn Y, it is required to make The driven roller 4 is press-contacted to the length measuring roller 5, and the covering member 4b is deformed at the crimping portion thereof, and the clamping force of the weft is increased by the covering member 4b. Therefore, if the thickness of the covering member 4b is too thin, deformation is difficult, and the sliding of the weft yarn Y is likely to occur. Therefore, the thickness t of the covering member 4b needs to be t≧1.5 mm, more preferably t≧2 mm. Therefore, by setting the thickness t of the covering member 4b to a range of 2 mm ≦ t ≦ 4 mm, the sliding of the weft yarn Y is not excessively increased, and a higher effect can be obtained in terms of durability.

However, 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, but even in the test of the roller having a different width of the yarn clamping surface 4b1 The same tendency was found for the results. According to the above, when the conditions other than the thickness of the covering member 4b (the outer peripheral diameter D, the width L0 of the roller 4a, the width L1 of the yarn clamping surface 4b1, and the like) are fixed, the covering member is used. A higher effect can be obtained by setting the thickness of 4b to 4 mm or less.

Moreover, if the analysis is carried out in combination with the test results in the above embodiment 2, When the thickness of the covering member 4 is 4 mm or less (2 mm or more), satisfactory durability can be obtained practically regardless of the width of the yarn clamping surface 4b1. Further, by setting the ratio of the width of the yarn clamping surface 4b1 to the width of the joint surface 4b2 to 90% or less, higher durability can be obtained.

Further, in the above test, the test was carried out after the outer peripheral diameters of the driven rolls were all set to be the same. The peripheral speed of the pair of rollers 4, 5 is determined according to the feed speed of the weft yarn Y, and therefore the number of revolutions of the driven roller 4 corresponds to its diameter. That is, if the outer circumference diameter is large, the number of revolutions is low, and if the outer circumference diameter is small, the number of revolutions is high. Further, in the case of a roller having the same structure, the lower the number of revolutions, the smaller the amount of heat stored in each portion of the covering member 4b, and the durability is also markedly increased. Therefore, when a roller having a larger diameter than that of the above-described third embodiment is used as the roller 4a as the driven roller 4, the number of revolutions is lowered, and it is considered that even if the thickness is further increased, high durability can be obtained. However, when the number of revolutions is reduced, the weight of the roller 4a and the covering member 4b is increased, so that the influence due to the inertia is increased, and the amount of heat generated in the crimping portion is increased. Therefore, the durability of the driven roller 4 does not increase as the diameter becomes larger, and it is still preferable that the thickness t is t≦4 mm.

However, when the influence of the inertia is small due to the low number of revolutions of the loom or the like, the durability may be changed in accordance with the change in the outer diameter of the driven roller 4. In other words, when the number of revolutions is increased by increasing the diameter of the driven roller 4, the durability of the covering member 4b may be increased even if the thickness of the covering member 4b is the same. In this case, sufficient durability can be obtained even if the thickness of the covering member 4b is made thicker than the thickness t = 4 mm described in the above-described third embodiment. Therefore, for the roller which is considered to have a small influence by such inertia, based on the test result of the above-described Embodiment 3, the optimum value according to the outer peripheral diameter D (= 65 mm) of the driven roller 4 and the thickness t of the covering member 4b ( The ratio (D/t) of t≦4) may be set so as to satisfy the thickness of the covering member 4a so as to satisfy D/t>16. In this case, satisfactory durability can be obtained also at the actual level.

Based on the above-described embodiments, in the present invention, the embodiments described below can also be employed.

(1) In the above-described second embodiment, in order to make the yarn clamping surface of the covering member 4b The width (L1) of 4b1 is smaller than the width (L0) of the joint surface 4b2, and as shown in Fig. 3(b), chamfers are applied to both sides of the outer peripheral side of the covering member 4b, but instead of Fig. 4 Apply rounding as shown in (a). Further, instead of changing the side portion such as chamfering and rounding, as shown in Fig. 4(b), the side portion of the covering member 4b may be formed as a linear connecting joint surface 4b2 and a yarn clamping surface. 4b1.

However, as shown in FIG. 3(a) and FIG. 4(b), in the case of having a shape of a corner portion having a substantially right angle on the contact surface (yarn clamping surface 4b1) side of the length measuring roller 5, This corner portion is caused to be damaged by repeated pressure contact with the length measuring roller 5 and repeated deformation. In detail, in the yarn clamping portion (crimping portion) between the two rollers 4, 5, the covering member 4b is crimped and deformed on the length measuring roller 5, and the deformed portion is driven by the driven roller 4. The rotation is released from the crimping portion and recovered from the deformed state. This operation is repeated for each rotation of the driven roller 4, and in the case of the deformation accompanying the pressure contact, the corner portion is in a state where the stress is most concentrated, and the corner portion is most deformed. Therefore, in each portion of the covering member 4b, the corner portion is largely deformed and restored in each rotation of the driven roller 4, thereby causing the corner portion to be broken.

On the other hand, in the roll to which the corner portion is chamfered or rounded, stress concentration is prevented, and partial breakage as described above is hard to occur. Further, the chamfered roller can also be said to have a corner portion. However, since the angle of the corner portion is larger than the angle at which the chamfer is not applied, the dispersion stress concentrates, and the amount of deformation at the corner portion is small, and the possibility of breakage of the corner portion is low. In addition, in the rounded rolls, the local deformation as described above is extremely small, and the possibility of breakage is lower.

(2) A fin for heat dissipation is formed on the roller 4a. According to this configuration, the heat dissipation efficiency of the roller 4a is improved, and the heat transfer efficiency from the covering member 4b to the roller 4a is improved. As a result, the amount of heat stored in the inside of the covering member 4b becomes smaller, and the durability of the driven roller 4 can be further improved. In addition, the fin for heat dissipation as used herein refers to the outer peripheral portion 4a1 corresponding to the width of the covering member 4b, the shaft portion 4a2 including the rotating portion, and the supporting portion 4a3 connecting the outer peripheral portion 4a1 and the shaft portion 4a2. The roller 4a is formed from a part thereof (for example, the side surface of the support portion 4a3, the inner circumferential surface of the outer peripheral portion 4a1, or the shaft portion) The outer peripheral surface) is a plate-like portion (member) that is formed to protrude.

As the fin for heat dissipation, it is conceivable that the support portion 4a3 provided between the shaft portion 4a2 of the roller 4a and the outer peripheral portion 4a1 as indicated by reference numerals 4f1 and 4f1 in Fig. 5 (a) (Fig. 6) The fins on the intermediate portion or the tabs extending from the end of the outer peripheral portion 4a1 of the roller 4a toward the center side of the roller 4a, as indicated by reference numerals 4f2 and 4f2 in Fig. 5(b). Further, the above-mentioned fins 4f1 and 4f2 may be tabs integrally formed with the roller 4a as shown in the drawing, or may be tabs formed separately and fixed to the roller 4a.

Further, as shown in Fig. 5(c), the fin for heat dissipation may be a portion in which the outer peripheral portion 4a1 of the roller 4a is formed wider than the covering member 4b, and which is more protruded in the width direction than the covering member 4b. 4f3, 4f3 act as a tab for the heat sink. Further, the fins 4f1, 4f2, and 4f3 may be annular fins that are continuous over the entire circumferential direction of the roller 4a, or may be tabs formed of a plurality of tabs that are intermittently disposed in the circumferential direction. .

Further, according to the structure of the heat sink shown in Fig. 5 (a), the effect of reducing the influence of heat generated on the side of the rotating portion can be obtained. That is, since the driven roller 4 is a roller that is rotationally driven at a high speed, heat is also generated in the rotating portion. Further, the heat generated in the rotating portion is transmitted to the support portion 4a3 by the shaft portion 4a2 of the roller 4a. Since the heat generated in the covering member 4b is also transmitted from the outer peripheral portion 4a1 side to the supporting portion 4a3, the supporting portion 4a3 is relatively easily in a high temperature state. When the support portion 4a3 is in a high temperature state, the position of the covering member 4b corresponding to the support portion 4a3 (near the intermediate portion on the inner peripheral portion side) is deformed or broken due to the influence of heat. Then, by providing the fins 4f1 for heat dissipation in the intermediate portion of the support portion 4a3, it is difficult to transmit the heat generated in the rotating portion to the side of the covering member 4b, and the heat from the side of the covering member 4b is also performed. The heat is dissipated to prevent the detachment of the covering member 4b, and it is also possible to prevent breakage of the inner peripheral portion of the covering member 4b as described above.

(3) The outer peripheral surface of the roller 4a is formed to have a plurality of outer peripheral surfaces having different diameters set to two or more, and the covering member 4b is brought into contact with at least one of the plurality of outer peripheral surface portions, and The different faces of the outer peripheral surface are in contact with the roller 4a Structure. Further, the outer peripheral surface referred to herein means a portion that forms the outer peripheral surface of the roller 4a. Further, the outer peripheral portion is not necessarily limited to a structure that is continuous in the circumferential direction, and includes a plurality of circles having a plurality of circular arc faces intermittently on the circumference of a virtual circle of a certain diameter and having the same radius from the center of the roller 4a. A collection of curved faces. Further, even if the outer peripheral portion is discontinuous in the width direction of the roller 4a, the portion defining the same diameter is also a part of one outer peripheral surface portion.

In the example shown in Fig. 6, the roller 4a is formed such that its outer peripheral surface has two sets of a plurality of circular arc faces on each circumference of two virtual circles A, B (diameter: A < B) having different diameters. The outer peripheral faces 4aA, 4aB. The outer peripheral surface portions 4aA, 4aB form the same diameter in the width direction of the roller 4a. Further, the covering member 4b is formed in such a shape that the joint surface 4b2 thereof coincides with the outer peripheral surface of the roller 4a, and as shown, the joint surface 4b2 of the covering member 4b is not only the above-described two outer peripheral surface portions 4aA of the roller 4a. 4aB is in contact with the surface of the outer peripheral surface portions 4aA and 4aB (the surface in the direction intersecting the outer peripheral surface portions 4aA, 4aB). Therefore, in the illustrated example, when viewed from the side, the covering member 4b and the roller 4a are fitted in conformity with the uneven surface.

In the example shown in Fig. 7 (a), the roller 4a has an outer peripheral surface portion 4aC and an outer peripheral surface portion composed of two outer peripheral surface portions 4aD, 4aD having a diameter different from the outer peripheral surface portion 4aC. Further, in the example shown in FIG. 7(b), the outer peripheral surface portion composed of a plurality of (six in the illustrated example) outer peripheral surface portions 4aE formed by the same diameter, and the outer peripheral surface portion 4aD are larger than the outer peripheral surface portion 4aD. A plurality of (nine in the illustrated example) outer peripheral surface portions formed by the outer peripheral surface portion 4aF. Further, the outer peripheral surface portions 4aD, 4aD of the two outer peripheral surface portions 4aD, 4aD and Fig. 7(b) in Fig. 7(a) are discontinuous in the width direction of the roller 4a but have the same diameter, and therefore are prescribed by these plural The peripheral face forms a peripheral face. Further, in any of the examples, the joint surface 4b2 of the covering member 4b is formed in a shape conforming to the outer peripheral surface of the roller 4a, not only in contact with the outer peripheral surface portions 4aC, 4aD, 4aE, 4aF but also in connection with the small diameter. The outer peripheral surface portions 4aC and 4aE are in contact with the side surfaces (surfaces in the direction intersecting the outer peripheral surface) of the outer peripheral surface portions 4aD and 4aF of the large diameter, and are joined to the roller 4a.

According to these configurations, since the contact area between the roller 4a and the covering member 4b is increased, the heat dissipation efficiency from the covering member 4a to the roller 4a is further improved, and the bonding strength between the two can be improved. Moreover, since the covering member 4b is supported by the surface in the direction intersecting the outer peripheral surface, it is possible to compensate for the shortage of the mechanical strength of the covering member 4b.

Further, in the examples of Figs. 6 and 7, the roller 4a has a structure having two outer circumferential surface portions having different diameters on the outer circumferential surface thereof, but the outer circumferential surface portion formed on the roller 4a may have three or more diameters. Different parts. For example, in the example of FIG. 7(b), the outer peripheral surface portion 4aE (or 4aF) has the same diameter, but may be formed to have different diameters on the center side and the side surface side.

Further, in the examples of Figs. 6 and 7, the covering member 4b is in contact with all of the outer peripheral surface portions on the joint surface 4b2. However, the present invention is not limited thereto, and as shown in Fig. 8, the plurality of outer peripheral faces may be configured. It can be in contact with one of the faces and can also be in contact with a face other than the outer peripheral face.

Specifically, in the example shown in Fig. 8(a), the roller 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 in contact with only the outer peripheral surface portion 4aG with respect to the outer peripheral surface portion, and is not in contact with the outer peripheral surface portion 4aH. However, in the configuration shown in the figure, the covering member 4b is in contact with not only the outer peripheral surface portion 4aG but also the inward inner side surface 4aJ formed on the roller 4a and the surface 4aK opposed to the outer peripheral surface portion 4aG. Further, in the example shown in FIG. 8(b), the roller 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, the covering member 4b is in contact with only the outer peripheral surface portion 4aM with respect to the outer peripheral surface portion, 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 not only the outer peripheral surface portion 4aM but also the inward inner side surface 4aP formed on the roller 4a. Further, the inner side surface 4aP is formed to have an area larger than the area of the outer peripheral surface portion 4aN.

In the example of FIG. 8 , since the contact area between the roller 4 a and the covering member 4 b is increased, and the covering member 4 b is held and fixed on the surface in the direction intersecting the outer peripheral surface, FIG. 6 can be obtained. The structure shown in Fig. 7 has the same effect.

(4) As shown in Fig. 9, the support portion 4a3 of the roller 4a is formed into a blade shape as shown in Fig. 7. According to this configuration, with the rotation of the driven roller 4, the air sufficiently continues to pass through the inside of the roller 4a, and the heat radiation effect of the roller 4a can be improved.

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

1‧‧‧Loom

2‧‧‧Weft line length storage device

3‧‧‧ spindle

4‧‧‧ Roller (driven roller)

4a‧‧‧Roller

4a1‧‧‧The outer part

4a2‧‧‧Axis

4a3‧‧‧Support

4aA～H, M, N‧‧‧ peripheral face

4aJ, P‧‧‧ inside

4aK‧‧‧face opposite the peripheral face 4aG

4b‧‧‧Cover parts

4b1‧‧‧ yarn clamping surface

4b2‧‧‧ joint surface

4f1～3‧‧‧Trap

5‧‧‧ Roll (length measuring roll)

7‧‧‧The Ministry of Measurement

10‧‧‧ yarn body

11, 22, 35‧‧‧ Guides

14‧‧‧Time zone

16‧‧‧ Pulley

20‧‧‧Storage Department

21‧‧‧Rotary yarn guide

23‧‧‧Storage drum

24‧‧‧Determined card

26‧‧‧Drive mechanism

31‧‧‧Main nozzle

33‧‧‧Clamping device

1 is a perspective view showing an embodiment of the present invention; FIG. 2 is a perspective view showing a main part of an embodiment of the present invention; and FIGS. 3(a) and 3(b) are diagrams showing main parts of an embodiment of the present invention. 4(a) and 4(b) are front cross-sectional views showing main parts of an embodiment of the present invention; and Figs. 5(a) to 5(c) are front cross-sectional views showing main parts of another embodiment of the present invention. 6 is a side view in which a part of another embodiment of the present invention is omitted, and FIGS. 7(a) and 7(b) are front cross-sectional views showing main parts of another embodiment of the present invention; FIG. 8(a), ( b) is a front cross-sectional view showing a main part of another embodiment of the present invention; and FIG. 9 is a perspective view showing another embodiment of the present invention.

4‧‧‧ Roller (driven roller)

4a‧‧‧Roller

4b‧‧‧Cover parts

5‧‧‧ Roll (length measuring roll)

14‧‧‧Time zone

16‧‧‧ Pulley

20‧‧‧Storage Department

Claims (7)

A weft feeding device for a fluid jet loom, which is disposed at a position on the upstream side of a weft path of the main nozzle, sandwiches a weft thread between a pair of rollers that are rotationally driven by at least one roller, and outputs the same The roller is rotationally driven at a peripheral speed of 900 m/min or more, characterized in that at least one of the pair of rollers is formed of a metal roller and a soft material, and the covering member is bonded to the outer circumferential surface of the roller. In the configuration, the roller is formed of a mechanical component material having a higher thermal conductivity than iron, and the covering member is formed to have a thickness t of 2 mm ≦ t ≦ 4 mm. The weft feeding device of the fluid jet type weaving machine according to the first aspect of the invention, wherein the roller is formed of a mechanical component material having a thermal conductivity equal to or higher than that of an aluminum-based material. The weft feeding device of the fluid jet type weaving machine according to the second aspect of the invention, wherein the roller is formed of an aluminum-based material as a raw material. The weft feeding device of the fluid jet type loom according to any one of claims 1 to 3, wherein the covering member is formed such that a width ratio of the yarn clamping surface thereof and a width of a joint surface of the roller Still small. The weft feeding device of the fluid jet type weaving machine according to the fourth aspect of the invention, wherein the width of the yarn clamping surface of the covering member is 90% or less of the width of the joining surface of the roller. The weft feeding device of the fluid jet type weaving machine according to any one of claims 1 to 3, wherein the roller having the covering member has a peripheral diameter of D and a thickness of the covering member. When set to t, D/t>16 is satisfied. The weft feeding device of the fluid jet type weaving machine according to any one of the first aspect, wherein the roller has a plurality of outer circumferential surfaces set to have two or more different diameters on the outer circumferential surface thereof, The covering member is in contact with at least one of the plurality of outer circumferential surface portions of the roller and a surface different from the outer circumferential surface portion.