JP3379222B2 - Weft tension adjusting device for loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft tension adjusting device for a weaving machine, and more particularly to a weft tension adjusting device for adjusting the weft tension to be woven into a woven cloth so as to be uniform over the entire length.

[0002]

2. Description of the Related Art Conventionally, in a fluid jet loom, there is a device for adjusting the tension of a weft thread inserted in a warp shed so that the tension of the weft thread is uniform over the entire fabric during beating. , Japanese Patent Publication No. 48-15710 and Japanese Patent Publication No. 48-29512.

For example, Japanese Patent Publication No. Sho 48-15709 mentioned above.
In the technology disclosed in Japanese Patent Publication No. 48-15710 and Japanese Patent Publication No. 48-15710, a weft yarn is bent by a cam operation between a gripper (grasper) and a weaving edge between the end of weft insertion and the beating. By pulling back the weft from the warp shed and then loosening the weft, the tension of the weft inserted in the warp shed is adjusted so as to be uniform over the entire fabric during wefting.

Further, the technique disclosed in Japanese Patent Publication No. 48-29512 described above alleviates the tension by moving the gripper and the nozzle so as to approach the weave edge during the beating process.

[0005]

However, as in the former prior art, the weft is bent between the gripper and the weaving edge, and in the latter prior art, the gripper and the nozzle are moved. In this case, since the vicinity of the tip of the weft thread makes a sliding contact with a component of the tension adjusting mechanism, that is, a cam that bends the weft thread in the former prior art, and a guide of the storage section in the latter prior art. The weft is easily damaged by the friction generated by contact.

The damaged portion of the weft yarn is on the front side of the nozzle position and is located in the warp opening at the time of the next weft insertion. There is a problem that the quality of the cloth is deteriorated. Further, in both the prior arts, each of the constituent members of the tension adjusting mechanism itself, that is, in the former prior art, a cam for bending a weft, and in the latter prior art, a gripper and a nozzle operate (move). Therefore, there is a problem in high-speed followability and durability of the tension adjusting mechanism.

In view of the conventional problems as described above, the present invention performs the action of bending the weft yarn after the weft insertion is completed and before the beating, and then pulling it back from the warp opening and then loosening the weft yarn. By fixing and arranging the member at a specific portion, it is possible to prevent the occurrence of a flaw due to the damaged weft, and to perform the above-mentioned action only by the movement of the weft. The purpose is to solve the problem of durability.

[0008]

Therefore, in the invention described in claim 1, the weft yarn is put on the jet fluid by the weft yarn releasing operation by the weft gripping device and the fluid jet from the nozzle at the time of weft insertion. Wefting is performed in the opening, and the weft yarn inserted in the warp opening by the repulsion motion of the reed subsequent to the wefting is beaten before weaving and woven, and near the reed point, the nozzle and the weave edge In the loom, in which the weft is cut by a cutter, a weft bending piece is fixedly provided in the vicinity of the cutter, and the weft bending piece is provided with a reed between the end of the weft insertion and immediately before the beating. The inclined portion for bending that gradually touches the weft thread that is pushed out by the inclined portion for bending, and the inclined portion for bending that changes in inclination from a lower position to a higher position in the advancing direction of the reed, and the maximum inclined portion for bending. It is formed in succession Gradually bending degree of reducing the weft bending degree by the bending inclined portions until beating
It is a sloped part for reducing the
Inclined part for reducing the degree of bending that changes from high to low
And are provided, and the reed is moved integrally with the reed by the reed.
The weft that is pushed out is locked and pressed downward.
If the weft bending piece and the cutter are between the two locking pieces,
The weft tension adjusting device.
It

[0009]

According to a second aspect of the present invention, the position of the locking piece can be adjusted at least in the vertical direction. Claim 3
In the invention described above, the position of the weft bending piece is adjustable in the up-down direction and the front-back direction orthogonal to the direction in which the weft extends.

[0011]

In the invention according to claim 1, at the time of weft insertion,
By the releasing operation of the gripper and the fluid jet from the nozzle, the weft yarn is put on the jet fluid flow and put into the weft yarn opening. The weft yarn pushed out by the reed after the end of the weft insertion and immediately before the reed beating comes into contact with the bending inclined portion and is gradually bent.

That is, the reed gradually approaches the weft, and the weft comes into contact with the reed. The abutted weft comes into contact with the bending inclined portion of the weft bending piece to start pulling back the weft and By further movement of the reed, the amount of pullback is increased while moving from the lower portion to the higher portion along the bending inclined portion. Where reed
A pair of locking pieces that move integrally with the reed.
As a result, lock the weft that is pushed out by the reed and lower the weft.
For bending the weft bending piece as it can be pressed in the direction
It is possible to increase the degree of weft bending due to the inclined portion,
A large amount of weft pullback is available in a limited space.
You can When the weft is extruded over the bending inclined portion, the weft is reduced in bending at the bending degree reducing inclination portion of the weft bending piece, and the weft is loosened. For details, weft is for bending
When the weft is extruded beyond the inclined part, the weft becomes a weft bending piece.
When the weft thread starts to come loose, it comes into contact with the slope for reducing the degree of bending.
The weft thread is tilted to reduce the degree of bending due to the further movement of the reed.
Loosen while moving from high to low along the slope, and
Increasing the weft path length from the weft gripping device to the weave edge before weaving
The amount of weft yarn shortage due to
, The tension of the weft thread to be woven can be optimized.
It

By the beating motion following the weft insertion, the weft yarns inserted in the warp shed are beaten before weaving, captured by the warp yarns, and woven into a woven fabric. After this, the cutter cuts the weft yarn between the nozzle and the weave edge in the vicinity of the beating point. As described above, the weft bending piece gradually bends the weft that is pushed out by the reed after the end of the weft insertion and immediately before the reed beating, pulls back the weft, and until the beating, the weft by the bending inclined portion By reducing the degree of bending and loosening the weft, the increased weft path length from the weft gripping device to the weaving edge before weaving is compensated for by the loosened weft, so the tension of the weft inserted in the warp shed is reduced. It can be adjusted to be uniform during beating over the entire width of the woven fabric.

As a result of disposing the weft bending piece in the vicinity of the cutter, even if the weft slidably contacts the weft bending piece and is damaged, the damaged portion of the weft is in the vicinity of the cutter. This is a portion that will be the tip when the weft is inserted next time, and the tip is located outside the warp opening when the weft is inserted next time. As a result, the woven fabric does not have a flaw, and the quality of the woven fabric can be improved.

Further, since the weft bending piece is fixed and does not move (move), and the above-mentioned action is performed only by the movement of the weft, the problems of high-speed followability and durability can be solved.

In the invention according to claim 2 , the position of the locking piece can be set to an appropriate position, and in particular, when the position of the locking piece can be adjusted in the vertical direction, the degree of bending of the weft thread can be facilitated. The amount of pullback of the weft can be appropriately set.

In this case, the locking piece can be moved downward to increase the pullback amount of the weft. In the invention according to claim 3 , the weft bending piece can be set at an appropriate position, and in particular, if the position of the weft bending piece can be adjusted in the vertical direction, the degree of bending of the weft can be easily adjusted. Therefore, the pullback amount of the weft can be set appropriately.

In this case, the weft bending piece can increase the amount of pullback of the weft by moving upward. Furthermore,
If the position of the weft bending piece is adjustable in the front-back direction orthogonal to the direction in which the weft extends, the timing at which the weft moves from the bending inclined portion to the bending degree reducing inclined portion, that is, the timing at which the pullback action changes to the loosening action Can be adjusted appropriately.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 show the configuration of a fluid jet loom which is an embodiment of the present invention . Such a loom is a water jet loom, and the weft is passed through various mechanisms such as a weft measuring and storing device (not shown) in order, and then held by a reciprocating shaft in the vertical direction of a gripper 1 as a weft holding device. A fixed nozzle 2 is inserted through a pair of upper and lower clamps 1a and 1b.
Have been taken to. And, when weft insertion, gripper 1
By the releasing operation of the holding bodies 1a and 1b and the water jet from the nozzle 2, the weft yarn 3 is put on the jet water flow and put in the weft yarn in the opening of the warp yarn 4. Subsequent to this weft insertion, the reed 6 attached to the lead clamp 5 connected to the repulsion movement mechanism (not shown) performs the repulsion movement. By this beating operation, the weft yarn 3 inserted into the opening of the warp yarn 4 is beaten by the cloth fell F, captured by the warp yarn 4, and woven into the woven fabric C. Then, in the vicinity of the beating point, between the nozzle 2 and the weave edge S, the cutter 7 cuts the weft yarn 3 that has been beaten. Woven cloth C is woven by sequentially repeating weft insertion, beating, and cutting.

A weft bending piece 8 is fixedly provided on the nozzle 2 side in the vicinity of the cutter 7. This weft bending piece 8 is composed of a mountain-shaped substantially triangular portion 8A and an elongated substantially rectangular portion 8B, and one edge of the mountain of the substantially triangular portion 8A is beaten after finishing the weft insertion. Until just before, the weft thread 3 comes into contact with the weft thread 3 pushed out by the reed 6 and
A bending inclined portion 9 for gradually bending is provided.
The bending inclined portion 9 is formed on an inclined surface that changes in inclination from a lower position to a higher position in the traveling direction of the reed 6.

In addition, the other edge of the mountain shape of the substantially triangular portion 8A is formed so as to be continuous with the highest portion of the bending inclined portion 9, and the weft yarn is formed by the bending inclined portion before the beating. A bending degree reducing inclined portion 10 is provided as a bending degree reducing portion that reduces at least the degree of bending. The bending degree reducing inclined portion 10 is an inclined surface that changes in inclination from a higher position to a lower position as the reed 6 advances in order to gradually reduce the degree of weft bending by the bending inclined portion 9 before the reed beating. Is formed.

A hook portion 11 for locking the weft yarn 3 at the time of beating is formed at the edge of the substantially rectangular portion 8B connected to the lower portion of the bending degree reducing inclined portion 10. The weft bending piece 8 is attached to a bracket 12 fixed to a temple bar (not shown) of the frame at an end portion of the substantially rectangular portion 8B on the side opposite to the position where the hook portion 11 is formed so as to be positionally adjustable. This position adjusting structure is capable of adjusting the position of the weft bending piece 8 in the up-down direction and the front-back direction orthogonal to the direction in which the weft extends, and is formed at the end of the substantially square-shaped portion 8B. This is achieved by forming a through hole 13 for a bolt (not shown) for fastening the portion 8B to the bracket 12 as a burrow hole.

The weft bending piece 8 may be made of, for example, stainless steel in consideration of rust prevention and wear resistance, but it is more preferably made of ceramic to further improve wear resistance. On the other hand, in the reed 6, the weft 3 that moves integrally with the reed 6 and is pushed out by the reed 6.
A pair of locking pieces 14 that locks and presses downward
Is attached.

The pair of locking pieces 14 extend upward from the upper edge portion of the mounting portion 15 which is mounted on the lead clamp 5 at the lower end portion of the reed 6 in a positionally adjustable manner, and are bent toward the front weave F side. It is formed. The position of the pair of locking pieces 14 is
It is set at a position where the weft bending piece 8 and the cutter 7 can be located between the two locking pieces 14. The pair of locking pieces 14
The position adjusting structure of (1) makes it possible to adjust the position of the pair of locking pieces 14 in the vertical direction and the lateral direction in which the weft 3 extends.
This is achieved by forming an insertion hole 17 of a bolt 16 formed in the mounting portion 15 and fastening the mounting portion 15 to the lead clamp 5 as a burrow hole.

In FIG. 2, 20 is a heddle frame, 21 is an electrode of a weft yarn detector, 22 is a yarn end treatment yarn, 23 is a weft cutter, and 2 is a weft cutter.
Reference numeral 4 is a yarn end catching yarn guide. Next, the operation of this configuration will be described with reference to FIGS. When wefting,
Release operation of the grippers 1a and 1b of the gripper 1 and the nozzle 2
The weft yarn 3 is put on the jet water flow and weft-inserted into the opening of the warp yarn 4 by the water jetting from. The weft yarn 3 pushed out by the reed 6 after the weft insertion and immediately before the reed beating comes into contact with the bending inclined portion 9 of the weft bending piece 8 and is gradually bent.

That is, at the time of the crank angle of 260 degrees of the loom shown in FIG.
After that, the reed 6 gradually approaches the weft thread 3, and the weft thread 3 is locked to the locking piece 14 of the reed wheel 6, as shown in FIG.
At the time when the crank angle of the loom shown in (B) is 280 degrees, the weft thread 3 locked by the locking piece 14 comes into contact with the bending inclined portion 9 of the weft bending piece 8, and the weft thread 3 from the inside of the warp thread 4 is opened. Pulling back is started, and then the weft 3 is, as shown in FIG.
By further movement of the reed 6, the amount of pullback is increased while moving from the lower position to the higher position along the bending inclined portion 9.

At this time, as is clear from FIG. 5, since the warp 4 is not yet closed, the weft 3 can be pulled out from the warp opening as described above. When the weft yarn 3 is extruded beyond the bending inclined portion 9 at a crank angle of 320 degrees of the loom shown in FIG. 4 (D), the weft yarn 3 comes into contact with the bending degree reducing inclined portion 10 of the weft bending piece 8. Then, the loosening of the weft yarn 3 is started, and the amount of looseness of the weft yarn 3 is increased while the weft yarn 3 is moved from the high position portion to the low position portion along the bending degree reducing inclined portion 10 by the further movement of the reed 6.

By the beating motion subsequent to such weft insertion, the weft yarn 3 which has been weft-inserted in the opening of the warp yarn 4 is beaten at the cloth fell F, is caught by the hook portion 11 and is captured by the warp yarn 4, and the woven cloth is woven. Woven to C. In this process, the weft path length between the gripper 1 and the weave edge S of the cloth fell F increases, but this increase is replenished with the loosened amount. Immediately after this, the cutter 7 cuts the weft yarn 3 between the nozzle 2 and the weave edge S.

As described above, the weft bending piece 8 gradually bends the weft 3 extruded by the reed 6 after the end of the weft insertion and immediately before the reed beating, and pulls back the weft 3 until the beating. By gradually reducing the degree of weft bending and loosening the weft, the weaving edge S from the gripper 1 to the weave F
The increased weft path length up to can be compensated for by the loosened weft thread 3. Therefore, adjust the tension of the weft thread 3 put in the opening of the warp thread 4 so that it will be uniform over the entire width of the woven fabric during beating. You can

As a result of disposing the weft bending piece 8 on the nozzle 2 side in the vicinity of the cutter 7, even if the weft thread 3 is in sliding contact with the weft bending piece 8 and is damaged, the damaged portion of the weft thread 3 Is a portion in the vicinity of the cutter 7 and becomes a tip portion at the next weft insertion, and the tip portion is located outside the warp 4 opening at the next weft insertion. As a result, the woven fabric does not have a flaw, and the quality of the woven fabric can be improved.

Furthermore, since the weft bending piece 8 is fixed and does not move (move), and the above operation is performed only by the movement of the weft 3, the problems of high speed followability and durability can be solved. it can. Moreover, according to this structure, the reed 6
As a result of providing the locking piece 14 that moves integrally with the reed 6, the weft 3 can be pressed downward by the weft thread 3 pushed out by the reed 6, so that the weft bending piece 8 can be pressed downward.
The degree of bending of the weft yarn can be increased by the bending inclined portion 9 and the amount of pullback of the weft yarn 3 can be increased in a limited space.

Further, according to this structure, the weft bending piece 8
Can be positionally adjusted in the up-down direction and in the front-back direction orthogonal to the direction in which the wefts 3 extend, and the locking piece 14 can be positionally adjusted in the up-and-down direction and the lateral direction in which the wefts 3 extend. It is possible to set the position of the stop piece 14 to an appropriate position, and particularly, by adjusting the positions of the weft bending piece 8 and the locking piece 14 in the vertical direction, the bending degree of the weft thread 3 can be easily adjusted. Therefore, the pullback amount of the weft yarn 3 can be set appropriately.

In this case, the weft bending piece 8 can increase the pullback amount of the weft yarn 3 by moving upward, and the locking piece 14 can increase the pullback amount of the weft yarn 3 by moving downward. it can. Further, the position of the weft bending piece 8 can be adjusted in the front-back direction orthogonal to the extending direction of the weft 3, so that the timing at which the weft 3 moves from the bending inclined portion 9 to the bending degree reducing inclined portion 10, that is, the pullback The timing of shifting from the action to the loosening action can be adjusted appropriately.

[0034]

[0035]

As described above, according to the invention of claim 1, the weft bending piece gradually bends the weft pushed out by the reed after the end of the weft insertion and immediately before the reed beating, thereby forming the weft. Between pulling back and beating, the degree of bending of the weft yarn is reduced by the inclined portion for bending, and by loosening the weft yarn, the tension of the weft yarn inserted in the warp shed becomes uniform over the entire width of the woven fabric during beating. Can be adjusted.

As a result of disposing the weft bending piece in the vicinity of the cutter, even if the weft slidably contacts the weft bending piece and is damaged, the damaged portion of the weft is the portion near the cutter. Since it is a portion that will be the tip when the weft is inserted next time and the tip is located outside the warp opening at the time when the weft is inserted next time, the woven cloth does not have a flaw and the quality of the woven cloth can be improved. it can.

Furthermore, since the weft bending piece is fixed and does not move (move), and the above-mentioned operation is performed only by the movement of the weft, both high speed followability and durability can be improved. Furthermore, the slope for reducing the degree of bending
Therefore, the supply amount of the loose weft can be regulated in accordance with the increase of the weft path length from the weft gripping device to the weave edge before weaving, so that the tension of the weft to be woven can be optimized.

Furthermore, the reed moves integrally with the reed.
As a result of providing the pair of locking pieces, the weft thread pushed by the reed can be locked and the weft thread can be pressed downward, so that the degree of bending of the weft thread by the bending slope of the weft bending piece can be increased. In a limited space, a large amount of weft can be pulled back. According to the invention described in claim 2 , the position of the locking piece can be set to an appropriate position, the bending degree of the weft can be easily adjusted, and the pullback amount of the weft can be set appropriately. .

According to the third aspect of the present invention, the weft bending piece can be set at an appropriate position, the degree of bending of the weft can be easily adjusted, and the pullback amount of the weft can be set appropriately. In addition, it is possible to properly adjust the timing at which the weft moves from the bending slope to the bending degree reducing slope, that is, the timing at which the pullback action shifts to the loosening action.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention .

FIG. 2 is a plan view of the above embodiment.

FIG. 3 is a view on arrow X in FIG.

FIG. 4 is a front view for explaining the operation of the above embodiment.

FIG. 5 is a view for explaining the operation of the above embodiment, showing the operating states of the reed, warp, gripper, and cutter for each crank angle of the loom, and the amount of weft pullback and looseness.

[Explanation of symbols]

1 gripper 2 nozzles 3 weft 4 warp 6 reed 7 cutter 8 Weft bending piece 9 Inclination part for bending 10 Inclination part for bending degree reduction 14 Locking piece

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wahei Nishimura 5-3-1, Shimorenjaku, Mitaka City, Tokyo Nissan Texis Co., Ltd. (56) References JP-A-55-90647 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D03D 47/28-47/36

Claims (3)

(57) [Claims] 1. At the time of weft insertion, a weft releasing operation by a weft gripping device and a fluid jet from a nozzle cause the weft to be placed on the jetted fluid and weft-inserted in the warp opening, and the reed reed following the weft insertion. A weaving machine in which the weft yarn inserted into the warp shed by the striking motion is beaten before weaving and woven, and the weft yarn is cut by a cutter between the nozzle and the weave edge in the vicinity of the beating point. In, the weft bending piece is fixedly provided in the vicinity of the cutter, and the weft bending piece contacts the weft thread pushed out by the reed after the end of the weft insertion and immediately before the beating, thereby gradually bending the weft thread. A bending slope, which is formed continuously from the lowermost part to the higher position of the bending slope that changes in inclination from the lower position to the higher position as it goes in the advancing direction of the reed. weft bending by bending the inclined portion The degree
An inclined portion for gradually reducing the bending degree, which is a reed
Changes from high to low as you go in the direction of
An inclined portion for reducing the degree of bending is provided, and the reed is moved integrally with the reed and pushed out by the reed.
A pair of locking pieces that lock the weft thread and press it downwards.
The weft bending piece and the cutter are located between the two locking pieces.
A weft tension adjusting device for a loom, which is characterized by being provided on the urine . 2. The weft tension adjusting device for a loom according to claim 1 , wherein the engaging piece is positionally adjustable at least in the vertical direction. Wherein the weft bending piece is adjustable in position in the longitudinal direction perpendicular to the vertical direction and the extending direction of the weft according
The weft tension adjusting device of the loom according to claim 1 or 2 .