JP3350406B2 - Loom weft insertion device - 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 insertion device for a fluid jet loom, and more particularly, to a weft insertion nozzle corresponding to a weft inserted by a water jet loom capable of multicolor insertion. The present invention relates to an improvement in technology for moving to a weft insertion position.

[0002]

2. Description of the Related Art In a fluid jet loom such as a water jet loom, a weft insertion nozzle is moved to a predetermined weft insertion position corresponding to a weft to be weft inserted due to a problem of a space for placing a weft insertion nozzle. A weft insertion device is known. For example, JP-A-49-416
Japanese Patent Publication No. 71 discloses a weft insertion device that supports a plurality of weft insertion nozzles on a nozzle holding plate having a fan shape on the same circumference from a pivot axis thereof. A water supply passage is formed in the nozzle holding plate. More specifically, the nozzle holding plate communicates with a yarn supply pipe for supplying pressurized water and a water supply passage formed in a swing shaft integrally formed with the holding plate. A branch water supply path radially branched from the water supply path is provided on the nozzle holding plate, and communicates with each nozzle. Each branch water supply channel is provided with an on-off valve that is arranged on the same circumference as the pivot axis and that opens the water supply channel when pressed from the outside. Disclosed is that the corresponding weft insertion nozzle is moved to a desired position by a swing drive, and the on-off valve is opened and weft inserted by pressing by a cam.

[0003]

However, according to the above-mentioned technology, there is a problem that the swinging device, that is, the nozzle holding plate has a function of switching the water supply path, so that the insertion device becomes large. In other words, the nozzle holding plate has an opening / closing valve in the water supply passage of the weft insertion nozzle, so that the position of the weft insertion nozzle is restricted by the arrangement of the opening / closing valve and the water supply passage. It cannot be placed. Therefore, there is a problem that the swing amount of the nozzle holding plate increases with the weft thread switching, and furthermore, the inertia of the nozzle holding plate increases, resulting in poor responsiveness, which is not practical.

Accordingly, the present invention relates to a weft insertion device for a fluid jet loom in which a plurality of weft insertion nozzles are moved to a predetermined weft insertion position to reduce the swinging amount at the time of weft thread switching by reducing the size of the swing part. An object of the present invention is to provide a filling device.

[0005]

SUMMARY OF THE INVENTION With the above object, a weft insertion device according to the present invention is supported by a plurality of weft insertion nozzles and a loom frame in a swingable manner, and the plurality of weft insertion nozzles are swung. A swinging portion that is supported at a position separated from the axis, and swings the swinging portion in accordance with switching of the selected weft thread to move a corresponding weft insertion nozzle to a predetermined weft insertion position; In a weft insertion device of a fluid jet loom that performs weft insertion by supplying a pressurized fluid from a pressure fluid source to a weft insertion nozzle, the weft insertion device is provided in the swing portion corresponding to each of the plurality of weft insertion nozzles. A plurality of first flow paths that are communicated with the corresponding weft insertion nozzles; and a plurality of first flow paths that are provided corresponding to the plurality of first flow paths, respectively, and are swingable with respect to the first flow paths. A plurality of connected second flow paths Flow path switching means provided between the plurality of second flow paths and the pressure fluid source for switching the supply of the pressure fluid from the pressure fluid source to each of the second flow paths; Accordingly, the passage switching means switches the supply of the pressurized fluid from the fluid supply source to the corresponding second passage, and at least the weft insertion nozzle corresponding to the selected weft yarn has reached the weft insertion position. Thus, the first flow path or the second flow path is formed such that the corresponding first flow path and the second flow path are in communication with each other.

[0006]

When the pressure fluid from the pressure fluid source is supplied to the weft insertion nozzle, the plurality of first weirs provided in the swinging part corresponding to each of the plurality of weft insertion nozzles and communicated with the corresponding weft insertion nozzle are provided. And a plurality of second flow paths provided corresponding to each of the plurality of first flow paths and swingably connected to the first flow path, and a plurality of second flow paths. Flow path switching means provided between the flow path and the pressure fluid source for switching the supply of the pressure fluid from the pressure fluid source to each of the second flow paths, wherein the flow path switching is performed with the weft switching. The means switches the supply of the pressurized fluid from the fluid supply source to the corresponding second flow path, and when the weft insertion nozzle corresponding to at least the selected weft thread reaches the weft insertion position, the corresponding first weft thread enters the second weft insertion position. 1st flow path and 2nd flow path communicate Since the first flow path or the second flow path is formed so as to be in a state, the arrangement of the weft insertion nozzles of the oscillating parts, that is, the distance between the weft insertion nozzles or from the oscillating axis, The oscillating portion can be made more compact by arranging them closer to each other without being restricted by the arrangement of the switching valve and the like as in the related art. Accordingly, the swing amount of the swing portion becomes smaller in accordance with the switching of the weft yarn, and the inertia of the swing portion becomes smaller, so that the driving load is reduced and the responsiveness is further improved.

[0007]

1 and 2 show an example in which a weft insertion device 1 according to the present invention is applied to a water jet loom of two-color weft insertion. This is an example in which a positive cam mechanism is used to swing the horizontal nozzle.

The weft insertion device 1 includes a swinging part 3 having fixed weft insertion nozzles 2 corresponding to two wefts A and B, respectively.
A support portion 12 for swingably supporting the swinging portion 3 on the loom frame, and a flow path disposed between the pressure fluid source 17 and the support portion 12 and connected to the pressure fluid source 17 and the support portion 12 It has a switching valve 16 as switching means. The support portion 12 and the switching valve 16 are both fixed to a loom frame (not shown), and the swing portion 3 is swingably supported by the support portion 12 and is connected to the drive portion 4. It is driven to swing.

The oscillating section 3 is composed of two holding members 7 and oscillating shafts 8 provided corresponding to the nozzles. The two weft insertion nozzles 2 are fixed on the swing shaft 8 via holding members 7 in the weft insertion direction. These holding members 7 are provided with two weft insertion nozzles 2.
Are held at a predetermined interval, and are fixed to the swing shaft 8 via a convex spherical fitting portion 9 and a concave spherical bush 10, respectively. Swing shaft 8, fitting part 9, bush 1
The zero and two holding members 7 each have a first flow path 11 which constitutes a first flow path described later and communicates with a not-shown reflux portion of the weft insertion nozzle 2.

Each of the holding members 7 is fixed at a predetermined intersection angle with respect to the swing shaft 8 by tightening a bolt to a split tightening structure provided at one end of the holding member 7. At this time, the tightened bush 10 is deformed,
The first flow path 11 formed on both the holding member 7 and the swing shaft 8 is maintained in an air-tight or liquid-tight state by the bush 10 and the fitting portion 9 being fitted and closely fitted by the spherical surface. You. More preferably, the bush 10 may be provided with a slit in the axial direction so as to be easily deformed. Since the bush 10 and the fitting portion 9 are fitted by a spherical surface, the posture of the holding member 7 and thus the weft insertion nozzle 2 can be easily adjusted with a large degree of freedom. In addition, these fittings may be fitting by a flat surface,
It is not limited to the above spherical fitting. Further, the posture adjustment of the weft insertion nozzle 2 is not limited to the above-described fitting, and a known technique may be applied.

The size of the first flow path 11 is set in advance so that the flow rate and the resistance of the weft insertion fluid do not significantly change when the attitude of the weft insertion nozzle 2 is adjusted. Specifically, the holding member 7, the bush 10, and the fitting portion 9 are provided so that the effective area of the flow path 11 is not substantially reduced even when the weft insertion nozzle 2 is rotated within the posture adjustment range. The diameter of each of the flow paths is determined in advance.

The oscillating portion 3 is rotatably supported by a support portion 12 which supports both ends of the oscillating shaft 8, and is supported by a spacer 30 and a nut 31 so as not to move in the axial direction. The support portion 12 includes a bracket 14 fixed to a loom frame (not shown) and a bearing 13 fixed to the bracket.
Consists of A bearing 13 is fixed to the bracket 14, and rotatably supports the swing shaft 8 via the bearing 13.

The bearing 13 and a switching valve 16 serving as a flow path switching means are connected via a pipe 15, and a flow path 13a inside the bearing 13 and a flow path 15a inside the pipe 15 are both a second flow path. 50. Prior to weft selection, the switching valve 16 switches to a flow path for supplying a pressure fluid from a pressure fluid source prior to weft insertion, and the corresponding weft insertion nozzle 2 passes through a second flow path and a first flow path. Is supplied with the pressure fluid (water).

On the other hand, in the swing unit 3, when the selected weft insertion nozzle is located at least in the desired weft insertion position, the flow path leading to the weft insertion nozzle communicates with the pressure fluid source, in other words, the swing shaft. The opening of the first flow path 11 formed in 8 and the opening of the flow path 13a, which is the second flow path 50, face each other, so that the effective area of the flow path does not become substantially narrow. Further, the flow path may be formed so as to be always in communication regardless of the position of the weft insertion nozzle. For example, as shown in FIG.
Is formed so as to expand in the axial direction, or conversely, as shown in FIG. 4, the first flow path 11 of the swing shaft 8 is formed so as to expand in the circumferential direction. Good. In addition, since the rocking shaft 8 and the bearing 13 are maintained in an air-tight or liquid-tight state,
The compressed fluid from the pressure fluid source 17 can be supplied to the weft inlet nozzle 2.

The driving unit 4 converts the rotational driving force of the output shaft of the electric actuator 5 fixed to the loom frame, such as a servomotor, into a oscillating motion.
The transmission means 6 is configured to transmit the data to In this embodiment, the transmission means 6 is the output shaft 2 of the electric actuator 5.
1 and two cams 18 and 19 fixed to
A cam lever 20 as a follower that comes into contact with two of the cam rollers 8 and 19 so as to be sandwiched between the two cam rollers 22. The cam lever 20 is fixed to the swing shaft 8 by a split screw 23.

The cam profiles of the two cams 18, 19 are formed corresponding to the number of weft nozzles 2. 2
In the case of color weft insertion, for example, it is configured as a two-repeat cam, the output shaft is rotated by １ ／, and the weft insertion nozzle is moved once. Therefore, the cams 18 and 19 are configured as eccentric conjugate plate cams having the same shape, and are fixed to the output shaft 21 in a state where the phases are shifted by 180 °.

The shapes of the cams 18 and 19 are preset so that when the follower moves once, it gradually moves at first, gradually, and gradually as it approaches a desired position. For this reason, when one of the two weft insertion nozzles 2 is guided to a desired weft insertion position on the warp line, the two swinging amounts of the cam lever 20 become smaller than in the previous state. The shapes (profiles) of the cams 18 and 19 are formed. In this way, the electric actuator 5 is driven by 1/2 rotation corresponding to the weft, the cam lever 20 is swung to a desired position, and the weft insertion nozzle 2 is guided to the desired weft insertion position via the swing part 3. Is done.

In a preferred embodiment for the shape of the cams 18, 19, dowels are provided. That is, when the weft insertion nozzle reaches the desired weft insertion position, the cams 18, 19
The cams 18 and 19 form a contour shape, that is, a dwell, equidistant from the drive center of the followers, that is, before and after a portion where the follower or the cam roller 22 abuts. Moreover,
Since the dwell is formed in anticipation of the amount of overshoot (the amount of rotation) generated by the positioning drive of the electric actuator 5, even if the overshoot occurs, the cam lever 20 does not move.
Stops reliably at a predetermined horizontal insertion position.

As described above, in the cam mechanism, as the weft insertion nozzle approaches the weft insertion position, the transmission means 6 is set so that the swing angle of the swing shaft 8 with respect to the rotation amount of the output shaft 21 of the electric actuator 5 becomes smaller. Constitute.

FIG. 5 shows an example in which the servo circuit as the electric actuator 5 is driven by the control circuit 24 in synchronization with the rotation of the loom based on the weft selection commands a and b. The control circuit 24 includes a weft selection command output prior to weft insertion, a main shaft angle signal か ら from an angle signal generator 27 connected to the main shaft of the loom, and a unit rotation of the main shaft 26 set by the setting device 25. A drive amount signal .theta. Is generated according to the selection of the weft yarns A and B, and the drive amount signal .theta.
The driving means 28 rotates the electric actuator 5 by a predetermined amount in a predetermined direction, that is, a predetermined direction, or a normal or reverse direction, based on the driving amount signal θ, and outputs the rotation amount to an encoder connected to the electric actuator 5. The drive is performed under the feedback control by the rotation signal f from 29.

In this way, the electric actuator 5 is driven intermittently in response to the switching of the wefts A and B. If there is no switching of the wefts A and B, the control circuit 24
Does not drive the conduction actuator 5 and maintains the current selected position. Thereafter, when the weft selection command a or b is input and the switching of the wefts A and B occurs, the weft insertion nozzle 2 corresponding to the weft insertion is moved to a predetermined weft insertion position before the next weft insertion is started.

Since the movement of the weft insertion nozzle 2 corresponding to the weft selection is synchronized with the movement of the loom, the control circuit 24 intermittently drives the electric actuator 5 in synchronization with the rotation of the main shaft 26. Drive. Generally, the spindle 26
The rotation amount (driving amount) of the electric actuator 5 corresponding to the rotation of (i) can be freely set. Therefore, it is set appropriately so as to eliminate the actual drive delay or in consideration of the cam shape. The electric actuator is driven intermittently to stop rotation in a predetermined direction at the time of weft switching in the above example. However, in order to avoid the influence of inertia of the driving source, a repeat cam matching the weft insertion pattern is used. May be mounted and driven continuously at a constant speed. In addition, the drive may be performed in a gradual manner, or the drive may be repeatedly rotated and stopped in the forward and reverse directions, and is not limited to the drive pattern. The drive amount signal Θ output of the control circuit 24 is output corresponding to the main shaft angle signal 、. For example, a predetermined drive amount signal θ is output based on a timing signal output when the main shaft reaches a predetermined angle. The form in which the drive amount signal θ is generated is not limited.

FIG. 6 shows the operation of the weft insertion nozzle moving device 1 corresponding to the selection of the wefts A and B. When the weft selection commands a and b are switched, the control circuit 24 rotates the electric actuator 5 by a predetermined rotation amount from the time of the switching. After the rotation amount reaches a predetermined target value, the electric actuator 5 increases or decreases while vibrating with respect to the target value due to overshoot, and finally reaches the target value. In the process of rotating the cams 18 and 19 in response to the rotation of the electric actuator 5 and swinging the cam lever 20, the cam lever 20 swings the swing shaft 8 to move the selected weft insertion nozzle 2 to a predetermined width. Move to the loading position.

As the weft insertion nozzle reaches the weft insertion position, the swing unit 3 with respect to the rotation amount of the electric actuator 5 is adjusted.
The transmission means 6 is configured so that the swing angle of the cams 18 and 19 becomes small. Therefore, even if the cams 18 and 19 do not immediately stop at the target position due to the overshoot of the output shaft 21 of the electric actuator 5, Since the overshoot is absorbed in the process of converting the motion between the cam lever 20 and the cam lever 20, the swing shaft 8 of the swing unit 3, that is, the holding member 7 and the weft insertion nozzle 2 integral with the swing shaft 8, can be inserted into the desired weft insertion. It stops at the position and is in a stable state without being affected by overshoot. As a result, the jetting fluid from the weft insertion nozzle 2 does not fluctuate, so that the weft insertion operation is stabilized.

On the other hand, the switching valve 16 is also driven to switch the flow path in response to the weft selection command. For example, a switching valve 16 constituted by a rotary valve includes:
A rotary actuator (not shown) such as a rotary solenoid or a motor is connected, and weft selection commands a and b.
, A control circuit (not shown) for driving the actuator is provided, and switches to supply the pressurized fluid from the pressurized fluid source to the corresponding weft insertion nozzle in response to the switching of the weft thread. The switching valve 16 includes a mechanically driven valve in addition to the electrically driven valve.

As described above, according to the present invention, when the pressure fluid from the pressure fluid source is supplied to the weft insertion nozzle, the corresponding weft insertion nozzle is provided on the swinging part corresponding to each of the plurality of weft insertion nozzles. And a plurality of second flow paths provided corresponding to each of the plurality of first flow paths and swingably connected to the first flow path. A path, and a path switching means provided between the plurality of second flow paths and the pressure fluid source for switching supply of the pressure fluid from the pressure fluid source to each of the second flow paths; At the same time, the passage switching means switches the supply of the pressurized fluid from the fluid supply source to the corresponding second passage, and at least the weft insertion nozzle corresponding to the selected weft reaches the weft insertion position. Corresponding to this in the state Since the first flow path or the second flow path is formed so that the first flow path and the second flow path are in communication with each other, the arrangement of the weft insertion nozzle of the swinging unit, ie, The oscillating portion can be made more compact by arranging them closer together without restricting the distance between the insertion nozzles or the oscillating axis by the arrangement of the on-off valve and the like as in the related art. Accordingly, the swing amount of the swing portion becomes smaller in accordance with the switching of the weft yarn, and the inertia of the swing portion becomes smaller, so that the driving load is reduced and the responsiveness is further improved.

Various modifications of the embodiment are possible.
First, with respect to the configuration until the fluid is supplied to the second flow path, that is, the configuration of the pressure fluid source and the flow path switching means, in the above embodiment, fluid from one pressure fluid source is supplied to the two weft insertion nozzles by the switching valve. An example of switching and supplying, for example, a channel switching means for switching the supply of the pressure fluid from the pressure fluid source to the horizontal channel communicating with the nozzle or the channel communicating with the fluid discharge port corresponding to the nozzle. It may be applied to a form in which a pressure fluid is supplied to a weft insertion nozzle at the time of weft insertion, and a flow path is switched to a fluid discharge port to discharge the supplied fluid when weft insertion is not performed. Not done.

In the above example, the member forming the second flow path is also used as the bearing. However, a member forming the flow path is separately provided, and the flow path is formed by slidingly contacting the swing part 3. May be. For example, while the opening of the first flow path is provided at the shaft end of the swing shaft 8, another member having the second flow path is provided in sliding contact with the swing shaft 8, so that both flow paths are connected. The flow path may be formed as described above, and the form of the flow path formation is not limited.

With respect to the structure of the transmission means 6, instead of the cam mechanism, the transmission means 6 can be constructed by applying another transmission mechanism as long as it converts rotational movement into linear movement. FIG. 5 is an example in which the swing shaft 8 is driven by applying a lever crank mechanism. That is, the rotation of the output shaft 21 of the electric actuator 5 is transmitted to the crank 32 fixed to the output shaft 21, and the rotation of the crank 32
3 The swinging motion is converted into a swinging motion and transmitted to a swinging lever 36 as a follower connected by pins 34 and 35 at both ends thereof, and the swinging shaft 8 swings. The swing lever 36
Reaches the position where the direction of this rocking motion changes,
When the position of the connection point between the crank and the link, in other words, the position of the pin 34 reaches the top dead center or the bottom dead center, the weft insertion nozzle is fixed to the swing shaft 8 by the split tightening screw 23 so as to reach a desired position. . Thereby, the weft insertion nozzle 2 is guided to the weft insertion position by the swinging motion of the swing shaft 8 performed in response to the weft.

The transmission means 6 by such a link mechanism also causes the transmission means 6 to reduce the swing angle of the swing part 3 with respect to the rotation amount of the electric actuator 5 as the weft insertion nozzle reaches the weft insertion position. Therefore, even if an overshoot occurs on the output shaft 21 due to the positioning drive of the electric actuator 5, the swing angle of the swing lever 36 relative to the rotation amount of the crank 32, that is, the deflection of the weft insertion nozzle is extremely small, and the influence is not affected. Difficult. Of course, the transmission means 6 can be configured by applying another link mechanism such as a piston / crank mechanism.

Although the above specific example is directed to a loom capable of inserting two colors, it is also applicable to a loom of three colors or more. In response to this, the drive section 4 appropriately sets the cam shape such as repeat and cam profile, the drive pattern of the electric actuator, and the like. Also, the cam is preferably a positive cam, but is not limited to this. A negative cam, for example, a plate cam, a groove cam, a swash plate cam, a direct-acting cam, or the like,
If the cam lever 20 is combined with a spring so that the cam lever accurately follows the cam shape, the same effect as that of the positive cam can be obtained. Further, the electric actuator 5 is not limited to a servomotor, but may be any one capable of controlling the amount of rotation of a stepping motor, a rotary solenoid, or the like. Etc. may be applied. The fluid jet loom is not limited to the water jet loom, but may be an air jet loom. In this case, the control target is a weft insertion nozzle or another fluid jet nozzle.

[0032]

As described above, according to the present invention, when supplying the pressurized fluid from the pressurized fluid source to the weft insertion nozzle, a plurality of weft insertion nozzles are provided in the oscillating part corresponding to each of the weft insertion nozzles. A plurality of first flow paths connected to the weft insertion nozzles, and a plurality of first flow paths provided corresponding to each of the plurality of first flow paths and swingably connected to the first flow path. A second flow path; and flow path switching means provided between the plurality of second flow paths and the pressure fluid source, for switching supply of the pressure fluid from the pressure fluid source to each of the second flow paths. In response to the weft switching, the flow path switching means switches the supply of the pressurized fluid from the fluid supply source to the corresponding second flow path, and at least the weft insertion nozzle corresponding to the selected weft yarn is inserted. After reaching the position, Since the first flow path or the second flow path is formed such that the first flow path and the second flow path communicate with each other, the arrangement of the weft insertion nozzle of the swinging unit, ie, The oscillating portion can be made more compact by arranging them closer together without restricting the distance between the weft insertion nozzles or the oscillating shaft center by the arrangement of the on-off valve as in the prior art. Accordingly, the swing amount of the swing portion becomes smaller in accordance with the switching of the weft yarn, and the inertia of the swing portion becomes smaller, so that the driving load is reduced and the responsiveness is further improved.

[Brief description of the drawings]

FIG. 1 is a front view of a weft insertion device using a cam mechanism.

FIG. 2 is a partially broken plan view of a weft insertion device using a cam mechanism.

FIG. 3 is a view showing a first example formed on both the swinging part and the communication means.
FIG. 10 is a cross-sectional front view showing a modified example of the flow path and the second flow path.

FIG. 4 shows a first example formed on both the swinging part and the communication means.
FIG. 10 is a cross-sectional front view showing a modified example of the flow path and the second flow path.

FIG. 5 is a block diagram of a control system of a driving unit.

FIG. 6 is an explanatory diagram showing a change in a rotation amount of an electric actuator and a position of a weft insertion nozzle in response to a weft selection command;

FIG. 7 is a front view of a weft insertion device using a lever crank mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal insertion device 2 Horizontal insertion nozzle 3 Oscillating part 4 Driving part 5 Electric actuator 6 Transmission means 7 Holding member 8 Oscillating shaft 8a Channel 11 First channel 12 Supporting part 13 Bearing 13a Channel 15 Pipe 15a Channel 16 switching valve 50 second flow path

Claims (1)

(57) [Claims] A plurality of weft insertion nozzles, and a swinging part which is swingably supported by a loom frame and which supports the plurality of weft insertion nozzles at a position separated from a swing axis. When the weft is switched, the swinging portion is swung to move a corresponding weft insertion nozzle to a predetermined weft insertion position, and pressurized fluid is supplied to the weft insertion nozzle from a pressure fluid source. In a weft insertion device of a fluid injection loom for performing insertion, a plurality of first flow paths provided in the swinging part corresponding to each of the plurality of weft insertion nozzles and communicated with the corresponding weft insertion nozzle. ,
Provided corresponding to each of the plurality of first flow paths,
A plurality of second flow paths swingably connected to the first flow path; and a second flow path provided between the plurality of second flow paths and the pressure fluid source. Flow path switching means for switching the supply of pressure fluid from the pressure fluid source to the flow path. When the weft is switched, the flow path switching means switches the supply of the pressure fluid from the fluid supply source to the corresponding second flow. While switching to the path, at least the weft insertion nozzle corresponding to the selected weft thread has reached the weft insertion position, and the first flow path and the second flow path corresponding to the weft insertion nozzle are in communication with each other. A weft insertion device for a loom, wherein the first flow path or the second flow path is formed.