JPH08209494A - Picking apparatus in rapier loom - Google Patents

Abstract

PURPOSE: To avoid sliding friction between a rapier band and a pressing member to improve durability of the rapier band by forming a rapier wheel so as to correspond to width of woven fabric without making the diameter of the rapier wheel large-sized. CONSTITUTION: Engaging holes are provided in rows in the longitudinal direction of a rapier band 4 in the rapier band 4 having a rapier head 23 fixed to the first end part. The rapier band 4 is put around a rapier wheel 3 in a state engaging with an engaging protruded part 21 formed on the periphery of the rapier wheel 3. Pressing rollers 24 and 25 are rotatably installed at a position corresponding to the position separated from the rapier wheel 3 and an endless belt 32 is stretched in a state incapable of engaging with the rapier band 4 among the rapier wheel, pressing rollers 24 and 25 and a tension roller 31. The outside of rapier wheel 3 having a part to which the belt 32 is stretched and the outside diameter of pressing rollers 24 and 25 are set so that reciprocating rate of the rapier band 4 coincides with the peripheral speed of the pressing rollers 24 and 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft inserting device for a rapier loom, and more particularly to a band type (flexible rapier) weft inserting device that uses a band that is rigid and can be flexibly deformed.

[0002]

2. Description of the Related Art This type of weft inserting device is provided with a rapier band having a rapier head fixed to the tip and a rapier wheel around which the rapier band is wound. The rapier wheel is reciprocally rotated so that the rapier head fixed to the rapier band enters into the warp opening and withdraws from the warp opening for weft insertion. Then, the centrifugal force associated with the rotation of the rapier wheel acts on the rapier band to lift the rapier band from the circumferential surface of the rapier wheel.

As a structure for reciprocating a rapier band,
There is an apparatus disclosed in Japanese Patent Publication No. 60-40538 shown in FIG. In this device, a rapier band 61 having a rapier head 60 fixed to the tip is used, and a rapier wheel 62 with its base end being fixed to the peripheral surface of the rapier wheel 62.
Is wrapped around. Two rollers 63 and 64 are arranged above the rapier wheel 62 in order to prevent the rapier band 61 from being lifted from the peripheral surface of the rapier wheel 62. Rapier wheel 62 and both rollers 63, 64
A rope 65 that presses the rapier band 61 against the surface around which the rapier wheel 62 is wound is wound between and.
As shown in FIG. 8, grooves 63a and 64a for guiding the rope 65 are formed on the peripheral surfaces of both rollers 63 and 64, and the first roller 63 is disposed so as to be inclined with respect to the plane including the rapier wheel 62, The second roller 64 is arranged parallel to the plane. The both ends of the rope 65 are fixed to the rapier wheel 62, and the rope 65 is wound around the entire circumference of the rapier wheel 62 and around the half circumferences of the rollers 63 and 64 in a substantially eight shape. Both rollers 63, 64
Is urged by a spring (not shown) in a direction to apply a pre-tension to the rope 65.

Further, like the devices disclosed in Japanese Patent Laid-Open Nos. 53-111160 and 1-97235,
There is a rapier wheel in which engaging projections are arranged in a row in the circumferential direction, and a rapier band is provided with engaging holes in a row in the length direction of the band. The rapier band is wrapped around the rapier wheel in a folded shape with the engaging protrusion and the engaging hole engaged, and the reciprocating rotation of the rapier wheel is based on the engagement between the engaging protrusion and the engaging hole. And the rapier head is reciprocated along with the reciprocating rotation of the rapier wheel. In the device disclosed in Japanese Patent Laid-Open No. 53-111160, in order to prevent the rapier band from rising, the pressing roller rotates on the back side of the winding portion of the rapier band that corresponds to the position where the rapier band moves away from the rapier wheel. It is arranged as possible. Moreover, JP-A-1-9
In the apparatus disclosed in Japanese Patent No. 7235, a pressing member made of a porous synthetic material impregnated with grease or lubricating oil is fixedly arranged instead of the pressing roller.

[0005]

Problems to be Solved by the Invention JP-A-54-1568
In the device disclosed in Japanese Patent No. 58, in order to accommodate a wide width of the woven cloth, the rapier head has to be increased in stroke, so that the rapier band must be wound around the rapier wheel in multiple turns or the diameter of the rapier wheel must be increased. However, multiple winding is very difficult. In addition, increasing the diameter of the rapier wheel causes a significant increase in the moment of inertia, which impedes the speedup of the rapier loom and increases power consumption.

On the other hand, JP-A-53-111160,
In the device disclosed in Japanese Patent Application Laid-Open No. 1-97235, the rapier band is wound and engaged only on a part of the entire circumference of the rapier wheel. Therefore, the diameter of the rapier wheel can be reduced, which is advantageous in increasing the speed of the rapier loom. However, in JP-A-53-111160 in which a pressing roller is arranged to prevent the rapier band from rising, the pressing roller is in line contact with the rapier band, and the length of the contact portion is very short, which is less than the width of the rapier band. Therefore, slippage easily occurs between the pressing roller and the rapier band. Since the pressing roller presses the rapier band in a freely rotating state, the movement of the rapier band opposes the inertial force of the roller, especially immediately after the moving direction of the rapier band is switched, causing slippage. Then, the rapier band is easily worn by sliding friction, and the power loss increases by the amount of friction. Further, the sliding portion of the rapier band generates a large amount of heat, and the resin rapier band is easily deteriorated by the heat, so that the life of the rapier band becomes shorter.

Further, since the pressing member impregnated with grease or lubricating oil slides and guides the rapier band as in JP-A-1-97235, sliding friction is reduced, but when the rapier band enters the warp opening. Grease and lubricating oil may scatter on the woven fabric to contaminate it.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to cope with a wide width of a woven cloth without increasing the diameter of the rapier wheel, and to provide a rapier band and a pressing member. It is an object of the present invention to provide a weft inserting device in a rapier loom, which can improve the durability of a rapier band by avoiding sliding friction between them.

[0009]

In order to achieve the above object, according to the invention of claim 1, a rapier wheel having engaging convex portions arranged in a row at a predetermined pitch on a peripheral surface thereof, and a rapier head at a first end portion thereof. And a flexible rapier band in which engaging holes capable of engaging with the engaging protrusions are arranged in a longitudinal direction of the flexible rapier band with the engaging protrusions engaging with the engaging holes. In a weft inserting device in a rapier loom that winds the weft into the warp shed by inserting the rapier head into the warp shed by reciprocating rotation of the rapier wheel. A pressing roller is rotatably arranged on the back side of the winding portion of the corresponding rapier band, and an endless belt for transmitting the rotation of the rapier wheel to the pressing roller is attached to the rapier wheel. And the pressing roller and the tension roller in a state in which they cannot be engaged with the rapier band, and the outer diameter of the rapier wheel and the outer diameter of the pressing roller at the portion around which the belt is wound are determined by the reciprocating speed of the rapier band and the pressing roller. It was set so that the peripheral speed of the part that comes into contact with the rapier band would be the same.

According to a second aspect of the invention, the tension roller is arranged on the sley side with respect to the rapier wheel. According to a third aspect of the present invention, in the first aspect of the present invention, the tension roller is disposed on the side opposite to the sley side with respect to the rapier wheel, and the endless belt is provided on the back surface of the winding portion of the rapier band. In the engaged state, it was wound between the rapier wheel, the pressing roller and the tension roller.

According to a fourth aspect of the present invention, the roller is rotatably disposed on the back side of the winding portion of the rapier band corresponding to the position where the rapier band is separated from the rapier wheel, and one roller is provided between the rapier wheel and both rollers. The belt was wound so that the part would engage with the back side of the looping part of the rapier band and a part would engage with the rapier wheel.

According to a fifth aspect of the invention, in the invention according to the fourth aspect, a round belt having elasticity is used as the belt, and the rapier wheel has a position shifted in phase in a width direction from a winding portion of the rapier band. A guide part for guiding the belt, and a winding part for allowing the belt to move in the width direction between the guide part and a position corresponding to the rapier band with respect to the belt. did.

[0013]

According to the invention described in claims 1 to 5, the reciprocating power of the rapier wheel which is reciprocally rotated is transmitted to the rapier band through the engaging projection and the engaging hole. Due to this power transmission, the rapier band is reciprocally moved so that the rapier head enters the warp opening and retracts from the warp opening to insert the weft.

In the invention according to claim 1, the pressing roller presses the back side of the wound portion of the rapier band corresponding to the position where the rapier band is separated from the rapier wheel. When the rapier wheel rotates, the pressing roller is rotated via the belt so that the peripheral speed of the portion in contact with the rapier band matches the reciprocating speed of the rapier band. The pressing roller is in line contact with the rapier band as in the conventional device. However, unlike the conventional apparatus, the pressing roller is not rotated by the frictional resistance at the contact portion with the rapier band, but is rotated by the belt wound around the rapier wheel, the pressing roller and the tension roller. Therefore, no slippage occurs between the pressing roller and the rapier band, and wear of the rapier band is prevented.

According to the second aspect of the invention, since the tension roller is arranged on the sley side with respect to the rapier wheel, the width of the entire loom does not become wide even if the tension roller is provided. The other actions are similar to those of the first aspect of the invention.

According to the third aspect of the invention, the belt is wound around the rapier wheel from the rear side of the rapier band in the portion where the rapier band orbits the rapier wheel, and the pressing roller is in contact with only the belt. Therefore, even if the outer diameter of the pressing roller is arbitrarily changed regardless of the outer diameter of the rapier wheel, the moving speed of the belt becomes the same as the moving speed of the rapier band, and slippage with the rapier band does not occur and the rapier band Wear is prevented.
The other actions are similar to those of the first aspect of the invention.

According to the fourth aspect of the present invention, the belt presses the rapier band against the rapier wheel at the portion where the rapier band orbits the rapier wheel. Since the belt comes into contact with the rapier band over the entire circumference of the rapier band and moves at the same speed as the rapier band, no slippage occurs between the belt and the rapier band and wear of the rapier band is prevented.

In the invention described in claim 5, a round belt having elasticity is used as the belt, and the belt is guided by the guide portion of the rapier wheel and the guide groove of the roller,
A part of it reciprocates while surely pressing the back surface of the rapier band at the lap portion of the rapier band. The other operation is the same as that of the invention described in claim 4.

[0019]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic front view showing the weft insertion start end side of the weft insertion device. Since the weft insertion end side disposed on the right side is configured symmetrically, illustration and description thereof are omitted and the weft insertion start end side is omitted. explain.

As shown in FIG. 1, a rapier wheel 3, a rapier band 4 and a drive mechanism 5 for the rapier wheel 3 are arranged symmetrically with a reed 2 supported on a sley 1 interposed therebetween. The sled 1 is supported on a swing shaft 7 via a sled sword 6. The sley 1 rotates integrally with the swing shaft 7 about the swing shaft 7. A drive shaft 8 is provided directly below the swing shaft 7.
Are rotatably arranged. The drive shaft 8 is arranged in parallel with the swing shaft 7, and a driven gear 9 is fixed to the drive shaft 8 so as to be integrally rotatable. A servo motor 10 is installed near the drive shaft 8. A drive gear 11 is integrally rotatably fixed to the output shaft 10a of the servomotor 10. The drive gear 11 meshes with the driven gear 9, and the rotation of the servo motor 10 is transmitted to the drive shaft 8 via the drive gear 11 and the driven gear 9. The servomotor 10 rotates only in one direction, and the drive shaft 8 rotates only in one direction.

A double cam 12 is integrally rotatably fixed to both ends of the drive shaft 8, and a double cam lever 13 is integrally rotatably fixed to both ends of the swing shaft 7.
The double cam 12 and the double cam lever 13 constitute a positive cam mechanism, and the rotation of the drive shaft 8 in one direction is converted into reciprocating rotation of the swing shaft 7 via the positive cam mechanism. The reciprocating rotation of the swing shaft 7 causes the sley 1 to swing back and forth, and the reed 2 performs a beating operation.

Oblique cranks 14 are fixed to both ends of the drive shaft 8. A bifurcated intermediate link 15 is rotatably connected to the oblique shaft crank 14, and a support shaft 16 is rotatably supported by the intermediate link 15. A segment gear 17 is rotatably supported at an intermediate portion of the support shaft 16. The oblique shaft crank 14, the intermediate link 15, the support shaft 16, and the segment gear 17 form a three-dimensional crank mechanism 18.

On the side of the three-dimensional crank mechanism 18, the rapier wheel 3 is disposed so as to be integrally rotatable together with the support shaft 19. The support shaft 19 is horizontally arranged in a state of being orthogonal to the drive shaft 8, and a driven gear 20 is fixed to the support shaft 19 so as to be integrally rotatable. The segment gear 17 meshes with the driven gear 20, and rotation of the drive shaft 8 in one direction is converted into reciprocating rotation of the rapier wheel 3 via the three-dimensional crank mechanism 18 and the driven gear 20. That is, the rapier wheel 3 is reciprocally rotated by the operation of the servo motor 10.

Engagement protrusions 21 are provided on the peripheral surface of the rapier wheel 3.
Are arranged in rows at a predetermined pitch. The rapier band 4 is made of a material that is rigid and flexible, and the engaging protrusion 2
Engagement holes 22 (shown in FIG. 2) capable of engaging with 1 are arranged in a row along the longitudinal direction. The rapier band 4 is attached to the rapier wheel 3 in a state where the engaging protrusion 21 and the engaging hole 22 are engaged with each other.
It is wrapped in a folded shape. A delivery rapier head 23 is fixed to the first end of the rapier band 4. Since the engagement protrusion 21 and the engagement hole 22 are smoothly engaged with each other, a proper gap is provided between them.

Pressing rollers 24 and 25 are rotatably arranged on the back side of the winding portion of the rapier band 4 corresponding to the position where the rapier band 4 is separated from the rapier wheel 3. Shafts 24a and 25a of pressing rollers 24 and 25
Are rotatably supported by the support bracket 26. The base end of the support bracket 26 has a fixed support frame 27.
It is slidably fitted inside. A cap nut-shaped slider 28 is slidably and non-rotatably accommodated in the support frame 27. An adjusting screw 29 is screwed through the base end of the support frame 27. The tip of the adjusting screw 29 is screwed onto the slider 28. A compression spring 30 is interposed between the slider 28 and the support bracket 26.
The spring force of the compression spring 30 presses the pressing rollers 24 and 25 toward the rapier wheel 3, and the pressing rollers 24 and 25 press the rapier band 4 against the rapier wheel 3.

By changing the screwing position of the adjusting screw 29 with respect to the support frame 27, the position of the slider 28 in the support frame 27 is changed. The spring force of the compression spring 30 is changed by this position change, and the rapier band 4 of the pressing rollers 24 and 25 is changed.
The pressing force for is adjusted and changed.

As shown in FIG. 2, the pressing rollers 24, 2
5, grooves 24b and 25b are formed at positions corresponding to the engaging protrusions 21 to allow passage of the engaging protrusions 21. A tension roller 31 is arranged on the sley 1 side with respect to the rapier wheel 3. An endless belt 32 is wound around the rapier wheel 3, the pressing rollers 24 and 25, and the tension roller 31 in a state in which it cannot engage with the rapier band 4. In this embodiment, a flat belt is used as the belt 32. The belt 32 presses the rotation of the rapier wheel 3 and transmits it to the rollers 24 and 25. The outer diameter of the rapier wheel 3 around which the belt 32 is wound and the outer diameter of the pressing rollers 24 and 25 are determined by the reciprocating speed of the rapier band 4 and the peripheral speed of the portion where the pressing rollers 24 and 25 contact the rapier band 4. It is set to match.

For example, when the rapier wheel 3 is formed to have the same outer diameter in the portion around which the rapier band 4 is wound and the portion around which the belt 32 is wound, the outer diameters of the pressing rollers 24 and 25 are the same as those of the belt 32. Is different between the part wound around and the part contacting the rapier band 4. The radius of the rapier wheel 3 is R, the thickness of the rapier band 4 is t,
The radius of the portion of the pressing rollers 24 and 25 in contact with the rapier band 4 is r ₁ , and the belt 32 of the pressing rollers 24 and 25 is
Let r ₂ be the radius of the part around which (R +
t): r ₁ = R: r ₂ . That is, r ₂ = r ₁ −r ₁
It becomes t / (R + t). That is, the pressing rollers 24, 25
The outer diameter of the portion around which the belt 32 is wound is smaller than the outer diameter of the portion in contact with the rapier band 4.

On the other hand, when the pressing rollers 24 and 25 have the same outer diameter, the outer diameter of the rapier wheel 3 differs between the portion around which the rapier band 4 is wound and the portion around which the belt 32 is wound. When the radius of the pressing rollers 24 and 25 is r, the radius of the portion of the rapier wheel 3 on which the rapier band 4 is wound is R ₁ , and the radius of the portion of the rapier wheel 3 on which the belt 32 is wound is R ₂ , (R ₁ + t ): R =
R ₂ : r. That is, R ₂ = (R ₁ + t), and the radius of the portion around which the belt 32 is wound on the rapier wheel 3 becomes larger than the radius of the portion around which the rapier band 4 is wound by the thickness of the rapier band 4.

The shaft 31a of the tension roller 31 is supported in substantially the same structure as the shafts 24a and 25a of the pressing rollers 24 and 25 except that a tension spring 33 is provided instead of the compression spring 30. That is, the tension spring 33 is stretched between the slider 28 and the support bracket 26. Then, if the screwing position of the adjusting screw 29 with respect to the support frame 27 is changed, the position of the slider 28 in the support frame 27 is changed and the tension of the belt 32 is changed.

Next, the operation of the weft inserting device configured as described above will be described. The operation of the servomotor 10 causes the drive shaft 8 to rotate in one direction via the drive gear 11 and the driven gear 9. The rotation of the drive shaft 8 is converted into reciprocating rotation of the swing shaft 7 via the double cam 12 and the double cam lever 13. The sley 1 reciprocally rocks back and forth by the reciprocating rotation of the rocking shaft 7, and the reed 2 performs a beating operation.

The rotation of the drive shaft 8 is converted into reciprocal rotation of the rapier wheel 3 via the three-dimensional crank mechanism 18 and the driven gear 20. The reciprocating rotation of the rapier wheel 3 is carried out by the engagement between the engaging convex portion 21 and the engaging hole 22.
And the rapier band 4 is moved back and forth. The rapier head 23 moves in and out of the warp opening by the reciprocating movement of the rapier band 4. The left and right rapier wheels 3 rotate in opposite directions. Therefore, both rapier heads 23 synchronously enter the warp shed, meet at the central portion of the weaving width, and retract from the warp shed. The weft yarn (not shown) conveyed into the warp opening by the delivery rapier head 23 is delivered to the receiving rapier head. Then, the receiving rapier head retracts from the warp opening, so that the weft thread is passed through the warp opening.

Since the belt 32 is wound around the peripheral surface of the rapier wheel 3 for about half a round, and is pressed against the rapier wheel 3 with an appropriate pressing force by the tension roller 31, the belt 32 is kept between the belt 32 and the rapier wheel 3. No slippage occurs. Further, the belt 32 is the pressing roller 2
The belts 4, 25 are also wound around the peripheral surface for more than half a round, and proper tension is applied to the belt 32, so that slippage does not occur between the belt 32 and the pressing rollers 24, 25.

The pressing rollers 24 and 25 are arranged such that the peripheral speed of the portion around which the belt 32 is wound becomes equal to the moving speed of the belt 32, that is, the peripheral speed of the rapier wheel 3 around which the belt 32 is wound. It is rotated by the belt 32. Then, the portions of the pressing rollers 24 and 25 that come into contact with the rapier band 4 are rotated at the same peripheral speed as the moving speed of the rapier band 4. Therefore, the pressing roller 24,
25 is a state where no slippage occurs with the rapier band 4,
The rapier band 4 is pressed toward the rapier wheel 3 side to restrict the separation of the rapier band 4 from the rapier wheel 3.

When the freely rotating roller is pressed by the rapier band 4, the movement of the rapier band 4 opposes the moment of inertia of the roller immediately after the moving direction of the rapier band 4 is switched. Therefore, slippage occurs between the roller and the rapier band 4, and the rapier band 4
Is easily worn. However, as described above, the pressing roller 2
4 and 25 are both positively and via the belt 32 driven by the rapier wheel 3
It is rotated in synchronization with. Therefore, even immediately after the moving direction of the rapier band 4 is switched, the movement of the rapier band 4 does not oppose the inertial force of the pressing rollers 24 and 25. As a result, sliding friction between the pressing rollers 24 and 25 and the rapier band 4 is avoided, and wear of the rapier band 4 due to sliding friction is eliminated. Further, it is possible to reduce power consumption and improve durability of the rapier band.

Further, since an appropriate gap is provided between the engagement protrusion 21 and the engagement hole 22, the engagement protrusion 21 is engaged with the engagement hole 22 when the moving direction of the rapier band 4 is opposite. Collide with the wall surface of. However, since the rapier band 4 is pressed toward the rapier wheel 3 side by the pressing rollers 24 and 25 at both ends of the revolving part, the impact of collision is mitigated.

Further, in this embodiment, the tension roller 31 is used.
Is disposed on the sley 1 side with respect to the rapier wheel 3, the width of the entire loom does not become wide even if the tension roller 31 is provided. Further, since the tension of the belt 32 can be easily adjusted by changing the position of the tension roller 31, it is possible to easily change the tension to an appropriate tension corresponding to the rotation speed of the loom.

As shown in FIG. 1, guide plates 34 for guiding the rapier band 4 may be arranged on the sley 1 in the longitudinal direction of the sley 1. The guide plates 34 engage with both widthwise ends of the rapier band 4 to guide the rapier band 4. By providing the guide plate 34, it is possible to reduce the rate of failure of weft delivery between the delivery rapier head 23 and the reception rapier head.

(Embodiment 2) Next, a second embodiment will be described with reference to FIGS.
Follow the instructions below. In this embodiment, instead of directly pressing the rapier band 4 with the pressing rollers 24, 25, the rapier band 4 is pressed against the rapier wheel 3 by a belt 37 wound between the pair of rollers 35, 36 and the rapier wheel 3. The points are very different. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIGS. 4 and 5, the rapier wheel 3 serves as a guide portion for guiding the belt 37 at a position (in this embodiment, rear side) out of phase with the winding portion of the rapier band 4 in the width direction. Of the guide groove 38 is formed. The guide groove 38 is formed with a width capable of accommodating only one belt 37.

As shown in FIG. 3, the rollers 35 and 36 are rotatably arranged on the back side of the winding portion of the rapier band 4 corresponding to the position where the rapier band 4 is separated from the rapier wheel 3. Shafts 35a, 36 of rollers 35, 36
The a is rotatably supported by the same structure as the shaft 31a of the above-mentioned embodiment, and the rollers 35 and 36 are arranged at positions where they cannot contact the rapier band 4.

As shown in FIGS. 4 and 5, the rollers 35,
36 is a winding position on the guide groove 38 side from the engagement hole 4a of the rapier band 4 wound around the rapier wheel 3,
A winding portion 39 is formed between the position corresponding to the guide groove 38 and the movement of the belt 37. The winding portion 39 is formed to have a width that allows the two belts 37 to be lined up with a margin. A round belt having elasticity is used as the belt 37. The belt 37 is wound around the rapier wheel 3 and both rollers 35, 36 in a state of being engaged with the back side of the rapier band 4 at the circumference of the rapier band 4 and engaged with the guide groove 38 on the opposite side. ing. That is, the belt 37 is wound around the rollers 35 and 36 at a winding angle of 360 °.

The radius of the rollers 35 and 36 is r, and the belt 37 is
Is t, the radius of the portion of the rapier wheel 3 on which the rapier band 4 is wound is R ₁ , and the radius of the portion of the rapier wheel 3 on which the belt 37 is wound is R ₂ .
It is set so that (R ₁ + t): r = R ₂ : r. That is, the radius of the portion around which the belt 37 is wound, that is, the guide groove 38 of the rapier wheel 3 is
Is larger than the radius of the winding position by the thickness of the rapier band 4.

The rapier wheel 3 is reciprocally rotated in the same manner as in the above-described embodiment, and the rapier band 4 is also reciprocally moved in synchronization with the rapier wheel 3 by the engagement between the engaging projection 21 and the engaging hole 22. Since (R ₁ + t): r = R ₂ : r is set, the peripheral speeds of the rollers 35 and 36, the moving speed of the rapier band 4, the peripheral speed of the portion of the rapier wheel 3 around which the belt 37 is wound, and the belt 37 are The peripheral speeds of the back surface of the wound rapier band 4 are equalized. Therefore, the belt 37 is guided by the guide groove 38 and the winding portion 39, and reciprocates without slipping while being pressed against the rollers 35, 36, the circumferential portion of the rapier band 4, and the guide groove 38. Therefore, sliding friction between the rapier band 4 and the belt 37 is avoided, and wear of the rapier band 4 due to sliding friction is eliminated. Further, it is possible to reduce power consumption and improve durability of the rapier band.

Since the belt 37 presses the rapier band 4 toward the rapier wheel 3 side in the entire circumference of the belt 37, the effect of preventing the rapier band 4 from rising from the rapier wheel 3 is improved as compared with the above-mentioned embodiment. As a result, the impact when the engagement protrusion 21 collides with the wall surface of the engagement hole 22 when the moving direction of the rapier band 4 is opposite is further alleviated.

Further, in this embodiment, since the round belt having elasticity is used as the belt 37, the rapier wheel 3 is used.
Also, even if the belt 37 wound around the rollers 35 and 36 is twisted, unlike the case of the flat belt, the rapier wheel 3, the rapier band 4, and the rollers 3 are different.
The contact area of the belt 37 with respect to 5, 36 does not decrease.
Therefore, the belt 37 is smoothly moved. Even if the radius of the portion of the guide groove 38 is not exactly larger than the radius of the winding position of the rapier band 4 by the thickness of the rapier band 4, the error is absorbed by the expansion and contraction of the belt 37, and the belt slides with the rapier band 4. Move smoothly without any.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) Pressing rollers 24 and 25 and tension roller 3
When the belt 32 is wound around the rapier 1, the tension roller 31 may be arranged on the side opposite to the weft inserting side with respect to the rapier wheel 3, and the belt 32 may press the rapier band 4. In the case where the tip of the engaging convex portion 21 is projected from the engaging hole 22 as in each of the above-described embodiments, as shown in FIG. 25c is provided.

In this case, the belt 32 is wound around the pressing rollers 24 and 25 and the tension roller 31 in a state of pressing the rapier band 4 toward the rapier wheel 3 side in the winding portion of the rapier band 4. Since the belt 32 is pressed by the rapier band 4 over the entire circumference, the belt 32 reciprocates together with the rapier band 4 without causing slippage with the rapier band 4. Therefore, sliding friction between the rapier band 4 and the belt 32 is avoided, and wear of the rapier band 4 due to sliding friction is eliminated. Further, it is possible to reduce power consumption and improve durability of the rapier band.

Further, since the belt 32 presses the rapier band 4 toward the rapier wheel 3 side in the entire circumference of the belt 32,
The effect of preventing the rapier band 4 from rising from the rapier wheel 3 is improved as compared with the case of the first embodiment. Further, the rapier wheel 3 only needs to have a width necessary for winding the rapier band 4, and the weight thereof is reduced accordingly. Therefore, the inertial force is reduced and the power consumption is further reduced.

Further, two belts 32 are used and the engaging holes 22
A configuration may be adopted in which both sides of the rapier band 4 are pressed by the belts 32 with the belt sandwiched therebetween. (2) The thickness of the rapier band may be thicker than the height of the engaging protrusion. In this case, when the rapier band 4 is pressed toward the rapier wheel 3 side by the belt 32 as in (1),
The width of the belt 32 can be made as wide as the rapier band 4, and the effect of preventing the rapier band 4 from rising by the belt 32 is improved. Further, in the case of the first embodiment, it is not necessary to form the grooves 24b and 25b in the pressing rollers 24 and 25.

(3) When the pressing rollers 24, 25 and the rollers 35, 36 are supported, they may not be elastically supported via the compression spring 30 or the tension spring 33 but may be fixedly arranged at a predetermined position.

(4) When the pressing rollers 24 and 25 are rotated by the belt 32 in synchronization with the rapier wheel 3 as in the first embodiment, the tension roller 31 is opposite to the weft insertion side with respect to the rapier wheel 3. It may be arranged at.

(5) The rapier wheel 3 may be arranged above the weft insertion path of the rapier head 23. In this case, the mechanism for transmitting the turning force to the swing shaft 7 has a structure different from that of the above embodiment.

(6) Instead of the guide groove 38, a large number of regulating protrusions may be provided in a row along the circumferential direction as guide portions at predetermined intervals. (7) The belt 32 is not limited to a flat belt, but may be a V belt or a round belt. Further, the belt 37 is not limited to the round belt and may be a flat belt or the like.

(8) As the drive mechanism for reciprocally rotating the rapier wheel 3, a mechanism other than the three-dimensional crank mechanism 18 may be adopted. For example, the rack is reciprocated by a crank fixed to a shaft that rotates in the same manner as the crank shaft of the loom, and the reciprocating motion of the rack is driven by an idle gear 2
It may be a known configuration in which it is transmitted to 0.

Inventions other than those described in the claims that can be grasped from the respective embodiments and modifications will be described below together with their effects. (1) In the invention described in claim 1, a flat belt is used as the belt. In this case, the contact area between the belt and the rapier wheel and the pressing roller is large, and the belt is prevented from slipping even if the diameters of the rapier wheel and the pressing roller are reduced.

(2) In the invention described in claims 1 and 2, the rapier band is formed thicker than the height of the engaging projection. In this case, the rapier band can be pressed by the pressing roller even in the portion where the engagement holes are arranged in a row, and the effect of preventing the rapier band from rising by the pressing roller is improved. Further, it is not necessary to form a groove on the peripheral surface of the pressing roller to avoid contact with the engaging convex portion,
Manufacturing of the pressing roller is simplified.

(3) In the invention described in claim 3, the rapier band is formed to be thicker than the height of the engaging convex portion.
In this case, the rapier band can be pressed by the belt even in the portion where the engagement holes are arranged in a row, and the effect of preventing the rapier band from being lifted by the belt is improved.

[0059]

As described in detail above, the first to fifth aspects of the invention are described.
In the invention described in (1), it is possible to cope with a wide width of the woven cloth without increasing the diameter of the rapier wheel, and it is possible to prevent slippage between the rapier band and the pressing member. Therefore,
The rapier band is prevented from rising, and the wear of the rapier band due to friction is eliminated to improve the durability of the rapier band.

In the inventions according to claims 2, 4, and 5, the above-mentioned effects can be obtained without increasing the size of the loom. In the inventions according to claims 3 to 5, the belt further presses the rapier band toward the rapier wheel side along the entire circumference on the back side of the orbiting portion, so that the rapier band is further prevented from rising.

In the invention described in claims 4 and 5,
Further, since the tension roller is not required, the apparatus becomes compact as compared with the inventions described in claims 1 to 3.
According to the invention of claim 5, since the belt is a round belt, the contact area of the belt with respect to the rapier wheel, the rapier band, and both rollers is different from the case of the flat belt even if the belt wound in the form of a twist is twisted. Does not decrease and the belt is moved more smoothly.

[Brief description of drawings]

FIG. 1 is a partially omitted front view of a first embodiment.

FIG. 2 is a partially omitted side view.

FIG. 3 is a partially omitted front view of the second embodiment.

FIG. 4 is a partially omitted perspective view of the same.

FIG. 5 is a partially omitted side view of the same.

FIG. 6 is a partially omitted side view showing a modified example.

FIG. 7 is a schematic front view of a conventional example.

8 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 ... Sley, 3 ... Rapier wheel, 4 ... Rapier band,
18 ... Three-dimensional crank mechanism, 21 ... Engagement convex part, 22 ... Engagement hole, 23 ... Rapier head, 24, 25 ... Pressing roller, 31 ... Tension roller, 32, 37 ... Belt, 3
5, 36 ... Rollers, 38 ... Guide grooves as guide portions,
39 ... Wrapping part.

Claims (5)

[Claims] 1. A rapier wheel having engagement projections arranged in a row at a predetermined pitch on a peripheral surface thereof, a rapier head being fixed to a first end of the rapier wheel, and engaging with the engagement projections in the longitudinal direction thereof. A flexible rapier band having a row of dowel holes is wrapped around in a folded shape with the engaging projection and the engaging hole engaged, and the rapier head is inserted into the warp opening by reciprocating rotation of the rapier wheel. In a weft inserting device in a rapier loom that retracts the wefts by retracting from the warp shed, a pressing roller is rotatably arranged on the back side of the winding portion of the rapier band corresponding to the position where the rapier band separates from the rapier wheel. However, an endless belt for transmitting the rotation of the rapier wheel to the pressing roller cannot be engaged with the rapier band between the rapier wheel, the pressing roller and the tension roller. In the state of winding, the outer diameter of the rapier wheel and the outer diameter of the pressing roller at the portion where the belt is wound are set so that the reciprocating speed of the rapier band and the peripheral speed of the portion of the pressing roller that comes into contact with the rapier band match. Weft insertion device for the set rapier loom. 2. The weft inserting device in a rapier loom according to claim 1, wherein the tension roller is disposed on the sley side with respect to the rapier wheel. 3. The invention according to claim 1, wherein the tension roller is arranged on the side opposite to the sley side with respect to the rapier wheel, and the endless belt is engaged with the back surface of the winding portion of the rapier band. A weft insertion device for a rapier loom wound between a rapier wheel, a pressing roller and a tension roller. 4. A rapier wheel having engagement projections arranged in a row at a predetermined pitch on a circumferential surface, a rapier head being fixed to a first end of the rapier wheel, and engaging with the engagement projections in the longitudinal direction thereof. A flexible rapier band having a row of dowel holes is wrapped around in a folded shape with the engaging projection and the engaging hole engaged, and the rapier head is inserted into the warp opening by reciprocating rotation of the rapier wheel. In a weft inserting device in a rapier loom that retracts the wefts by retracting from the warp shed, a roller is rotatably disposed on the back side of the winding portion of the rapier band corresponding to the position where the rapier band is separated from the rapier wheel. , A weft in a rapier loom in which a belt is wound between the rapier wheel and both rollers so that a part of the rapier wheel engages with the back side of the orbiting part of the rapier band and a part of the rapier wheel engages with the rapier wheel. It is equipment. 5. A round belt having elasticity is used as the belt, and a guide portion for guiding the belt is formed on the rapier wheel at a position out of phase with the winding portion of the rapier band, and the roller is provided. The weft inserting device in a rapier loom according to claim 4, wherein a winding portion is formed on the belt, the winding portion allowing movement in a width direction between a position corresponding to the winding position of the guide portion and the rapier band with respect to the belt.