JPS595699B2 - Weft insertion device for shuttleless looms - Google Patents

Description

[Detailed Description of the Invention] The present invention generally relates to a weft insertion device in a shuttleless loom.
In particular, it relates to a device that inserts the weft by gripping the weft with a water valve and making the water valve fly.

In order to eliminate the various drawbacks of conventionally known fluid looms or gripper looms,
A completely new weft insertion method different from the conventional one, as disclosed in Japanese Patent No. 15586, is used, in which a water valve is fixed to the tip of the weft thread to be inserted using a jet of compressed air, and the weft thread is made to fly inside the opening of the warp thread. A weft insertion method was proposed for a shuttleless loom for weaving.

In this prior art weft insertion method, when a water valve is formed by a water valve forming device, the ice particles, which are the raw material for the water valve, are passed through only one passage to the water valve forming cylinder or forming chamber where the tip of the weft exists. Since the weft yarn is guided through the water valve, it is difficult to ensure that the weft yarn is gripped by the water valve at a fixed position of the water valve, that is, at a position as close as possible to the central axis of the water valve.

If gripping is uncertain, even slight dissolution of the surface of the water valve during acceleration of the water valve by a jet of compressed air and flight in the shed may cause the weft yarn to separate from the water valve.

Furthermore, if gripping is not performed at a constant position, the relationship between the direction in which the tension of the weft thread acts on the water valve and the flying direction of the ice body changes each time the weft is inserted, so that the trajectory of the water valve is not constant.

In particular, the gripping of the weft thread is carried out near the circumferential surface of the water valve,
Moreover, when there is uncertainty, the above-mentioned drawbacks become more apparent.

Such drawbacks are more likely to occur in shuttleless looms with a water valve insertion type, which require relatively high speed operation.
This is a problem that must be solved.

Further, the water valve type weft inserting device of the prior art described above is equipped with a water valve firing device that fires the water valve formed by the water valve forming device toward the opening of the warp through an accelerating tube.
In order to further ensure high-speed operation of a shuttleless loom with such a weft insertion device, it is necessary not only to consider the gripping of the weft by the water valve, but also to stabilize the acceleration time of the water valve when passing through the acceleration pipe. It is necessary to stabilize the timing of measuring and weft insertion.

Therefore, the main purpose of this invention is to ensure that the water valve always grips the weft at a substantially constant position, and to ensure stable high-speed weft insertion by stabilizing the acceleration time of the water valve when passing through the acceleration pipe. An object of the present invention is to provide a weft insertion device for a shuttleless loom.

For this purpose, the present invention provides a weft inserting device including a water valve forming device having a forming chamber, and a supply means for supplying ice grains, which are raw materials for water valves, to the forming chamber through at least two ice grain supply passages. and a water valve firing device connected to the molding chamber, the water valve molding device compressing two groups of ice particles supplied to the molding chamber in mutually opposing directions and molding them into a water valve. The water valve firing device includes a compression molding means, and the water valve firing device includes a hollow acceleration tube that guides and accelerates the fired water valve, and the axis of the acceleration tube is formed by the compression molding means in the molding chamber. The axis of the water valve coincides with the axis of the water valve in the molding chamber, and the water valve is fired by the water valve firing device while the water valve is held by at least a portion of the compression molding means.

According to this invention, the ice grains serving as the raw material for the water valve are supplied to the molding chamber through at least two ice grain supply passages, and the water valve is molded with the weft interposed between the ice grains. The grip of the weft by the water valve is reliable, and when the water valve is fired, the water valve is held by the compression molding means so that its axis coincides with the axis of the accelerator tube, so that the weft is not removed from the forming chamber. The introduction of the water valve into the acceleration pipe is carried out smoothly, so no extra force is used for acceleration, the acceleration time is stabilized, and therefore,
A shuttleless loom with stable weft insertion timing and higher speed rotation can be obtained.

Further, the water valve can be accelerated efficiently.

Other objects and advantages of the invention will become more readily apparent from the following detailed description of the preferred embodiment, illustrated in the accompanying drawings.

The apparatus of the present invention can use materials that change from a liquid phase to a solid phase and vice versa as the material of the weft conveying body. It also includes items made from materials with properties equivalent to those.

In addition, ice grains do not simply refer to granular objects, but also to shapes that can be molded into one piece by compression, such as powder, snow, etc.
It also refers to flaky, semi-solid, etc.

First of all, FIG. 1 is an explanatory diagram showing a partial cross-section of the entire weft insertion device according to the present invention. To roughly explain this weft insertion device, the tip of the weft yarn W from the weft cone I is connected to a water valve. It is located in the molding chamber of the water valve molding device B through the firing device A, and the ice grains produced by the ice grain manufacturing device C are supplied to this molding chamber through two ice grain supply passages.

The two groups of ice particles supplied are molded in a molding chamber surrounding the tip of the weft W to form a water valve 31.

The water valve 31 is fired by the water valve firing device A, passes through the forming chamber and the acceleration tube 29, and flies within the opening of the warp threads T, thus performing weft insertion.

Next, the above-mentioned weft insertion method and apparatus will be explained in more detail.

A length measuring drum 2 rotatably supported by a part of the machine stand 1 is pressed against the circumferential surface of a rotating roller 3 by a spring 4.

The rotating roller 3 is connected to a suitable drive device (
(not shown) and is constantly rotated.

Therefore, the length measuring drum 2 is also constantly rotated by the rotary roller 3 to measure the length of the weft yarn W from the weft cone 1.

In front of the length measuring drum 2 is a weft tension adjustment device 8, and in the rear is a storage device 9 for pooling a predetermined amount of weft yarns.

Therefore, the weft yarn W from the weft cone 1 passes through the guide 10, the tension adjustment device 8, and the guide 11, is measured on the cylindrical surface of the length measuring drum 20, and then further passes through the guide 12 and reaches the storage device 9.

The storage device 9 is provided with openings 9a and 9b at the top and bottom, and air normally passes through these openings 9a and 9b as shown by arrows, from the opening 9c on the left side of the storage device 9 to the opening 9d on the right side. Loosen the weft yarn W to be pulled out as shown in the figure.

Immediately before weft insertion, a predetermined amount of weft yarn W is pooled in the storage device 9.

A weft braking device 13 and a weft pulling device 14 are arranged behind the storage device 9.

The weft pulling device 14 is composed of a guide roller 15, a vertically movable pin 16, etc., and an acceleration tube 29 as described later.
The tip of the weft W cut by the cutter 30 disposed at the exit of the weft is pulled back into the molding chamber of the water valve molding device B, and when pulled back, the pins 16 move away from each other, The weft control device 13 brakes the weft W between its holding plates 13a and 13b during the pullback.

A compressed air water valve firing device A is arranged behind the weft pulling device 14.

The water valve firing device A includes an air injection cylinder 11 attached to a part of the machine base, and a piston 18 disposed therein.

The cylinder 17 is provided with an inflow hole 19 for compressed air.

A lever 20 is attached to the piston 18, and by driving this lever 20 in a manner to be described later, the piston 18 is allowed to reciprocate.

Compressed air is supplied to the water valve firing device A by a compressor 21.

The compressor 21 has a piston 22, which is driven by an appropriate drive device (not shown) via a crankshaft 23 and a connecting rod 24.

The air compressed by the compressor 21 is transferred to a compressed air tank 25.
, passes through the pressure regulating valve 26 and the auxiliary air tank 21 through the passage 28, is supplied into the cylinder 11 from the inlet hole 19 connected to the end of the passage 28, and is passed through the nozzle when the piston 18 moves to the left. Firing reservoir pressure is applied to the water valve, which will be described later.

The water valve firing device A has an elongated cylindrical hollow acceleration tube 29 extending toward the opening of the warp threads T.

A known cutter 30 for cutting the weft W after weft insertion is arranged near the tip of the accelerating tube 29.

In addition, at the rear of the water valve forming device B, there is a tension pad 213 which is driven as appropriate and comes into contact with the accelerator tube 29 during the weft pulling operation, elastically grips the weft and applies a predetermined tension to the weft. 214 can be arranged.

The water valve molding device B, which constitutes the main part of the present invention, is arranged to intersect with the water valve firing device A described above, and the intersection becomes a molding chamber for the water valve 31.

The water valve 31 molded in the molding chamber in the manner described below is
This is also ejected by the water valve ejecting device A in a manner to be described later, obtains the required speed through the accelerating tube 29, and heads toward the opening of the warp threads T.

The structure and operation of the water valve molding device B, which is the main part of this invention, and the water valve firing device A, which is closely related thereto, will be explained in detail later.

Ice grains 32 produced by the ice grain production apparatus C are supplied to the water valve molding apparatus B by an ice grain supplying apparatus in order to be used as a raw material for the water valve 31.

The ice production device C includes an insulating chamber 34 having walls 33 constructed of a suitable insulating material.

An annular freezing chamber 35 is formed within the heat insulating chamber 34,
An evaporation tube 36 is wrapped inside this.

Brine is supplied to this freezer compartment 35 from an opening (not shown).

A cylindrical ice particle production chamber 31 is formed in the center of the freezing chamber 35 , and a water injection pipe 39 rotatably supported by a ball bearing 38 enters the ice particle production chamber 37 from outside the insulation chamber 34 . ing.

The water injection pipe 39 is provided with an appropriate number of nozzles 41 in the portion inside the ice particle production chamber 3T for injecting ice-making water supplied from a water tank 40 placed above the heat insulation chamber 34.

42 is a driven pulley fixed to the upper part of the water injection pipe 39, and is driven by an appropriate drive source (not shown).

This drive causes the water injection pipe 39 to rotate.

Although not shown, the water injection pipe 39 is provided with a scraping plate that slides into contact with the freezing surface 43 of the ice particle production chamber 3T, so that ice formed on the freezing surface 43 can be scraped off.

Below the freezing chamber 35, there is a funnel-shaped collection opening 44 for the ice particles 32.

The lower end of the collection port 44 communicates with an ice particle supply device.

On the other hand, the lower end of the evaporation pipe 36 protrudes outside the heat insulation chamber 34 and is connected to an outlet pipe 45.

The outlet pipe 45 is connected to a compressor 46, and the compressor is connected to the condenser 4.
Connected to 1.

48 is a blower fan that air-cools the condenser 41, 49 is a suction pipe that sucks the warm air heated by the condenser 41, and its population is 5.
0 expands into a funnel shape to face the blower fan 48.

Further, the condenser 4T is connected to a liquid receiver 51, and a refrigerant pipe 52 extending therefrom is connected to an evaporator pipe 3 via an expansion valve 53.
It is connected to the part of the heat insulating chamber 34 of No. 6 that goes outside.

Ice grains 32 manufactured by such ice grain manufacturing apparatus C
enters the ice grain supply device from the lower end of the collection port 44.

This ice particle supply device is surrounded by the above-mentioned insulating wall 33 and includes a screw 56 rotatably supported by bearings 54 and 55.

One end of the screw 56 comes out of the wall 33 and is connected to the gear train 51, and the screw 56 is rotated by rotation of the gear train 5T by an appropriate drive device (not shown).

The other end of the screw 56 has two ice grain supply passages 58 and 59.
It ends near the 0 entrance.

Therefore, from the above explanation, the ice grains 32 made by the ice grain production device C are transferred to the two passages 58 by the ice grain supply device.
and 59 to the water valve molding device B, where it is molded together with the tip of the weft W to become the water valve 31. This water valve 31 is fired by the water valve firing device A and exits the accelerating tube 29. After that, it became clear that the warp yarns T passed through the openings.

60 is a woven fabric. Next, the water valves 31 that have passed through the openings of the warp threads T as described above are processed by the water valve processing device E.

This water valve processing device E includes a box-shaped water valve melting table 61 disposed opposite to the acceleration pipe 29.

At the vertical extension 62 of the melting table 61, there is a water valve 3 that has flown
A heater 63 capable of melting 1 is provided.

Further, above the melting table 61 there is a hot air jet nozzle 64 .

The blowout nozzle 64 is connected to a suction pipe 49 that sucks hot air heated by the condenser 47.

A water tank 65 located below the melting table 61 receives melted cold water, and the cold water is injected into the water tank 40 located above the ice grain production device C by a water pump 66.

In this way, ice grains can be produced at a relatively low cost by effectively utilizing the phase change of water.

Next, details of the water valve firing device A and the water valve molding device B will be explained in detail.

FIG. 2 is a partially cross-sectional side view of the water valve molding device B enlarged from the side of the accelerating tube 29, and the water valve molding device B includes a block 68 having a molding chamber 67.

The above-mentioned passages 58 and 59 are connected to this block 68, and further communicate with one ends of ice particle supply passages 58a and 59a provided in the block 68.

The cross-sectional area of the passages 58a and 59a becomes smaller toward their other ends so that the ice particles 32 are gradually compressed as they pass through them.

The preliminary compression of the ice grains in the passages 58a and 59a makes it possible to shorten the stroke of the main molding piston 69 and TO for compressing the ice grains in the molding chamber 67, thereby enabling high-speed operation, and the device Miniaturized.

The other ends of the passages 58a and 59a terminate above the molding chamber 61, and are spaced apart so that the bifurcated cutter 11 can advance and retreat at right angles to the molding chamber 67 between them. are doing.

Located between the legs 71a and 71b of the forked cutter 71 having ice cutting edges is a fixed blocking plate 72 that blocks the other ends of the passages 58a and 59a with respect to each other, the lower end of the blocking plate 72 is located directly above the molding chamber 6T.

When the cutter 71 is raised as shown in FIG.
The ice particles 32 are fed until they hit the shielding plate 12, and as they descend as shown in FIG. 2, the ice particles 32 are cut by the cutter 11 and fed into the molding chamber 61.

Therefore, the passages 58, 58a, 59 and 59a and the cutter ''11 can be considered as means for supplying the ice particles 32 to the molding chamber 61.

The cutter γ1 is operated by a drive shaft 73 via a cam and a lever 74 (not shown) provided thereon.

The lever γ4 is attached to the block 68 and is attached to the arm 15.
It is attached so that it can swing around a pin 76.

Therefore, the cutter 71 is moved up and down at appropriate timing by the rotation of the shaft 130, and supplies the ice particles 32 to the molding chamber 67.

The actuation of the main forming pistons 69 and 10 is also effected by the shaft 13.

That is, the shaft 13 is provided with a cam γ1, and this cam 71 is connected to the main molded piston 6 that protrudes outside the block 68.
9 engages a lever 79 having a forked end portion that pinches a pin 78 provided at the end of the lever 79 .

The lever 19 is swingable about the pin 80.

Also, the other main piston 1 protruding outside the block 68
A similar pin 81 is provided at the end of the lever 82, and the pin 81 and the forked end portion of the lever 82 engage with each other.

The lever 82 is swingable about the bin 83, and is pivoted counterclockwise in FIG. Always energized.

A connecting rod 81 swingably connects the levers T9 and 82.

Therefore, when the cam 17 is actuated to rotate the lever 19 counterclockwise, the main forming piston 69 is brought to the leftward retracted position as shown in FIG.
The zero rotation causes the lever 82 to rotate clockwise via the connecting rod 87, overcoming the action of the spring 85, and similarly brings the other main forming piston TO to the exit position.

Next, when the cam 11 does not operate, the lever 82 is rotated counterclockwise and the lever T9 is rotated clockwise by the action of the spring 85, as shown in FIG. and 69 to the entry or molding position shown.

When the main body of the water valve 31 to be manufactured is a cylindrical body, the recesses 88 and 89 formed at the inner ends of the main molded pistons 69 and 10 form a cylindrical body when the two are put together, as shown in FIG. However, it goes without saying that the scales can be changed arbitrarily depending on the shape of the water valve 31.

As described above, the main forming piston 69 and the TO, which are separated into left and right sides, can be moved simultaneously in opposite directions by one driving source (cam??), and the operating mechanism thereof is simple and easy.

In addition, if the levers 79 and 82 are configured so that their rotation centers can be changed by, for example, a combination of length and bolt, it is possible to adjust the stroke of the main molding piston, adjust the molding position, and adjust the molding position and the acceleration pipe position. It is possible to easily perform alignment, etc.

The cross-sectional area of the other ends (inner ends) of the passages 58a and 59a and the cross-sectional area of the legs 71a and 71b of the cutter 71 are such that the amount of ice grains cut by one operation of the cutter 71 is reduced to one at a predetermined compression rate. It has a size that allows the water valve 31 to be molded.

In addition, the tip shape of the cutter T1 is such that the tips of the legs 71a and 71b are the same as those of the water valve 31 when viewed from the axial direction of the water valve 31 as shown in FIG. It is inclined downward from the center to the outside, and when viewed along the axial direction of the water valve 31 as shown in FIG. part) slopes downward.

In this way, the ice grains to be supplied are cut by the cutter 71 in the amount necessary to manufacture one water valve, but the cutting cuts the legs 71a and 71b of the cutter 11 into the passages 58a and 58.
Even while blocking the inner end (exit side) of passage 9a, ice particles remain in passage 5.
8a and 59a, the surface hardness of the surface of the ice grain that hits the leg (between which the weft is gripped) increases, and when it is then cut and compression molded, the weft is more securely held. can be grasped.

As can be seen from FIGS. 2 and 4, the block 68 that defines the molding chamber 67 is formed with two rails 90 that extend horizontally at right angles to the axis of the water valve, and the main molding piston 69 and 70 have sliding portions 90 that fit into grooves 91 that the two rail portions 90 form between them.

Therefore, when the two main forming pistons 69 and 10 are in the forming position as shown in FIG. and the leading edge defining the ten recesses 88 and 89 can be protected from damage.

The interval between the two rail parts 900 is determined by the cutter 71 in the molding chamber 6.
The passage 58a is smaller than the axial length of the ice grain group 32 supplied to the passage 58a, and the ice grain group 32 gradually decreases in cross-sectional area.
and 59a, the ice particles 32 entering the molding chamber 67 straddle the two rail sections 90 and fall into the groove 91, as seen in FIG. There isn't.

Therefore, with such a configuration, the main forming pistons 69 and 70 compress the ice grain group 32 only on the surfaces that define the recesses 88 and 89, so that the ice particles 32 can be effectively formed with a small compression force.

Next, as can be seen from FIGS. 4 and 5, the molding chamber 61 includes the aforementioned main molding pistons 69 and 70, two rear doors 94 and 95 that define the rear end of the water valve, and the head of the water valve. It is limited by the front door 96 and 9T.

Vertical line 98 in FIG. 2 is the dividing line between rear doors 94 and 95 when they are closed.

As is clear from FIG. 5, the drive shaft 13 has a cam IT for the main forming piston in between, and cams 9 for the rear door and front door.
9 and 100 are provided.

Rear doors 94, 95 and front door 96 by cams 99 and 100
．． 97 should be operated using the same mechanism as the operation of the main molded pistons 69 and 70 by the cam 71 (lever 79, 82 connecting rond 81, etc. described in connection with FIGS. 2 and 3). Can be done.

Their operating modes will be described later using FIG. 6 a=f.

The front doors 96 and 9T have a concave surface corresponding to the shape of the water valve head 31a, and compress the head 31a during molding, so they may be called accelerated molding pistons.

Furthermore, the grooves 91 between the rail portions 90 in the molding chamber 67 communicate with a drainage hole 101, so that water discharged during compression molding of the ice grain group 32 can be removed from the molding chamber 61.

In addition, when manufacturing the water valve 31 having the truncated conical head 31a (FIG. 4) as described above, the two ice grain groups 32, which are the raw materials for the water valve 31, are as shown in FIG. As shown, it is preferable that the tip or head has a sharp shape.

In order to have such a shape, the passages 58a and 59a must be
It is sufficient to have the other end (inner end) shaped like this.

Assuming that the water valve to be manufactured has a shape with a conical head, but the group of ice particles supplied is a rectangular parallelepiped,
When the front doors 96 and 91 compress the corresponding portions of the ice grain group, the corner portions of the rectangular parallelepiped get caught between the joint surfaces of the front doors 96 and 91, which not only requires a large force for compression, but also makes molding impossible. Sometimes it becomes.

Therefore, with the shape of the ice grain group according to the present invention, compression force acts on the ice grain group efficiently and molding becomes easy, and therefore the main molding piston, front door, and rear door operate smoothly, and compression molding becomes possible. can save driving power.

From the above, it can be seen that the axial cross-sectional shape of the ice grain group 32, that is, the inner end shape of the passages 58a and 59, is preferably approximately similar to the axial center cross-sectional shape of the water valve 31.

From the above explanation, the ice particles 32 move from the passage 58 to 58a,
9 to 59a, and is extruded from the exits of passages 58a and 59a in the shape shown in FIG. The cams 77, 99 and 100 ride on the rail portion 90 and then rotate as the shaft 73 rotates.
It can be seen that the main molding piston 69.10, the rear doors 94, 95, and the front doors 96,97 are operated at the proper timing (described later) by the operation (1), and the desired water valve 31 is molded in the molding chamber 61.

The water valve 31 compression-molded in this manner must be fired by the water valve firing device A and must pass through the opening of the warp threads T.

Although the water valve firing device A described below is of a type that uses compressed air, the present invention is not limited to this type, and may be of a type that uses pressurized liquid, a spring, or the like.

First, if the molded water valve 31 adheres to the piston surface, the water valve firing timing, water valve flight speed, and acceleration time will become unstable, which will eventually hinder reliable weft insertion. Therefore, it is desirable to remove any adhesion that may have occurred on the water valve 31.

In Figures 4 and 5, the water valve firing device A is the accelerating tube 2.
9 and the molding chamber 67, the block 68 has an opening 102 provided in the block 68, one end of which extends close to the rear doors 94 and 950, and the other end of which is provided with a lever 10.
A piston 103 connected to 4 is arranged.

Lever 104 is actuatable by a suitable mechanism (not shown).

This piston 103 is actuated after at least the front door and the rear door have exited, and moves forward (slightly to the left in FIG. 4).
The adhesion is removed by shifting the position of the water valve 31 in the molding chamber 67.

After this action, the piston 103 returns to its original position.

The opening 102 communicates with a compressed air inflow hole 19 (see FIGS. 1 and 5) via a passage 105 provided in the block 68, and compressed air from the compressor 21 flows through the inflow hole 19 to the opening 102. The compressed air is supplied into the interior through a compressed air valve (not shown).

On the other hand, a nozzle section 106 is formed between the tip of the opening 102 and the tip of the piston 103, and the compressed air flows through the nozzle section 1.
The water is suddenly injected from 06, causing the water valve 31 to fire.

Therefore, the water valve 31 passes through the acceleration pipe 29, passes through the opening of the warp thread T, and reaches the water valve processing device E.

Thereafter, the weft W is cut by a cutter 30 located near the exit of the accelerating tube 29, and pulled back by the weft pulling device 14, so that the tip is located approximately in the center of the forming chamber 67 as shown in FIG. The tip is held by rear doors 94 and 95 at a position corresponding to approximately the center of the water valve.

Note that instead of using the piston 103 to prevent the water valve 31 from sticking, the main molding pistons 69 and 70 may be vibrated or heated after molding.

Furthermore, in order to ensure stable high-speed weft insertion by stabilizing the acceleration time of the water valve 31 when the accelerating tube 29 passes through, the accelerating tube 29 according to the present invention has its axis formed within the forming chamber 61. It coincides with the axis of the water valve 31.

In other words, the axis of the acceleration tube 29 is located at the main molding piston 69, the TO1 rear doors 94 and 95, and the front door 9 when in the molding position.
It coincides with the axis of the molding chamber 67 defined by 6 and 9T.

Also, the firing of the water valve 31 is performed by the main molded pistons 69 and 70.
This is done with the water valve held in place.

FIG. 6 a = f is a diagram for explaining the operating mode of the main molded pistons 69 and 70, the rear doors 94 and 95, and the front doors 96 and 97.

Figure 6a shows the state during water valve molding, in which members 69 to 10 and 94 to 97 are biased in the direction of the arrow by the above-mentioned cam and lever mechanism and are stationary at the positions shown in the figure, and are shown by dotted lines. A bullet-shaped molding chamber 6T is defined.

In the molding chamber 67, the water valve 31 tightly grips the weft W at the center and is molded.

In this state, the axis of the passage 29a provided in the block 68 so as to be aligned linearly with the acceleration tube 29 is located in the molding chamber 6.
7, and thus coincides with the axis of the water valve 31.

Next, in order to prevent the water valve 31 from sticking to the molding chamber 61, the rear doors 94, 95 and the front doors 96, 97 are moved in the direction of the arrow as shown in FIG. 6, and then the piston 103 is moved. By moving the main molded pistons 69 and 70 to the left until they slightly enter the recesses defined by the dotted lines, the molded water valve 31 is pushed forward and the surface of the main molded pistons 69 and 10 is moved to the left. Remove adhesion to.

The step d shown in FIG. 6 may be omitted.

By retracting the piston 103 to a predetermined position as shown in FIG. 6C, compressed air is guided to the rear end surface of the water valve 31 in the molding chamber through the passage 102 communicating with the air inflow hole 19 in FIG. .

At this time as well, the water valve 31 is held between the main molding pistons 69 and 10, so the axis of the water valve 31 is linearly aligned with the axis of the acceleration tube 29 and the passage 29a communicating therewith.

Therefore, as shown in FIG. 6d, the water valve 31 is ejected toward the passage 29a while gripping the weft W approximately at its center, and is smoothly introduced into the acceleration tube 29.

Therefore, no extra force is used for acceleration, and the acceleration time is stabilized, so the weft insertion timing is also stabilized, and a shuttleless loom capable of high speed rotation is obtained.

After the water valve is fired, the supply of compressed air is stopped, and the main molding pistons 69 and 10 and the front doors 96 and 97 are moved back as shown in FIG. 6e in preparation for the next water valve molding.

When the water valve 31 passes through the warp opening and weft insertion is completed,
The weft W is cut by a cutter 30 (first
(Figure).

The tip of the weft connected to the weft cone 1 is connected to a weft pull-back device 14
(FIG. 1), it is pulled back to the position (not necessarily this position) shown in FIG. 6f.

During the withdrawal, the weft threads may be kept under tension by any suitable method, such as a breeze or a mechanical gripping device such as an elastic pad.

Next, as shown in FIG.
Through a and 59a, the ice grain group 32 is attached to the main molded piston 69.
and 10, the main molding piston 69 is supplied to the front of the rear doors 96 and 91, and the two ice grain groups 32 move forward in the direction of the arrow.
and 70, compression molded by the front doors 96 and 91, and the sixth
The state shown in Figure a is reached.

When the water valve 31 is a cylindrical body, the front door and the rear door may have the same shape and operation.

As is clear from the above explanation, according to the present invention, the ice grains that are the raw material for the water valve are divided into two and supplied to the molding chamber from two directions, so when the water valve is molded, the weft is split into two parts. The weft is sandwiched between two groups of ice grains, making it possible to reliably grip the weft at a certain position on the water valve, especially near the center.

Therefore, even if the surface of the water valve may be slightly dissolved during the flight inside the acceleration tube and the warp opening, there is no fear that the weft thread will separate from the water valve, and the tension of the weft thread will be at the center of the water valve. Because of this, the flight of the water valve is always stable.

Also, during firing, the water valve is held between the two main molded pistons so that its axis is aligned linearly with the axis of the accelerator tube, so the acceleration time and weft insertion timing of the water valve are controlled. A shuttleless loom that is more stable and capable of high speed rotation is obtained.

Therefore, the present invention provides a shuttleless loom that ensures stable weft insertion at high speed by ensuring that the water valve always grips the weft at a constant position and stabilizing the acceleration time of the water valve when passing through the acceleration pipe. Provided a weft insertion device.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway schematic explanatory view of the entire weft insertion device according to the present invention, and FIG. 2 is an elevational view partially shown in cross section of the water valve forming device in the weft insertion device of FIG. 1. , 3rd
The figure is an elevational view showing the water valve molding device shown in Figure 2 during molding, and Figure 4.
The figure is a sectional side view partially shown in elevation along the line IV-fV in FIG. 3, FIG. 4a is a sectional view taken along line a-a in FIG. 4, and FIG. The plan view of FIG. 6 and FIGS. 6a-f are partial sectional views illustrating various operating states of the main molded piston and the like. In the figure, W is a weft, T is a warp, A is a water valve firing device, B is a water valve forming device, 29 is an accelerator tube, 31 is a water valve, 32 is an ice grain or a group of ice grains, 58.58a, 59. 59a is an ice grain supply passage, 61 is a molding chamber, 69 and TO are main molding pistons, 94 and 95 are rear doors, and 96 and 91 are front doors.

Claims (1)

[Claims] 1. A weft inserting bullet forming device having a forming chamber, a supply means for supplying bullet raw materials to the forming chamber through at least two bullet raw material supply passages, and a bullet firing device connected to the forming chamber, The bullet molding device includes compression molding means for compressing two bullet raw materials supplied to the molding chamber toward each other and molding them into a bullet, and the bullet firing device guides and accelerates the fired bullet. The axis of the acceleration tube is aligned with the axis of the bullet in the molding chamber formed by the compression molding means, and at least a portion of the compression molding means A weft insertion device for a shuttleless loom, wherein the bullet is fired by the bullet firing device while the bullet is held by the weft inserter.