JP2524766B2 - Thread guide device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement of a device for transferring a yarn in a standby position, pulling the yarn into a guide tube, and guiding the yarn to a predetermined position in a textile machine, particularly a loom.

Prior art The patent applicant disclosed in JP-A-61-48749 "Weft threading method" that the thread at the standby position is sucked inward by advancing the thread guide tube, and the thread is guided while sucking and holding the thread. It is disclosed that the pipe is transferred to the retracted position, further sucked and guided to a predetermined position.

However, when the yarn guide tube moves forward, the yarn in the standby position is
Since it is only in contact with the end face of the yarn guide tube, the suction air flow of the yarn guide tube does not effectively act on the yarn, and the yarn is less likely to be drawn into the yarn guide tube. Therefore, it is necessary to increase the suction air flow of the yarn guide tube. If a strong air flow is set during this delivery, the guiding effect on the yarn will be high, but on the other hand, the yarn will untwist inside the guide tube and will be easily broken, resulting in an impossible delivery of the yarn. Sometimes it becomes. In addition, the patent applicant is another Japanese Patent Application Sho 62-
According to the invention of No. 62290 "thread guide device", a guide member for restricting the guided yarn to the standby position is provided, and the guide member is configured when the yarn is transferred from one guide member to the inside of the other guide tube. At the tip of the insert, the thread locks the thread at the slit, and it is actively guided to the inlet of the suction nozzle formed in the thread guide tube. It discloses that it is drawn in by a flow. Even in the above device, since the yarn is located at the opening of the suction nozzle by the insert and does not reach the narrowed portion of the suction nozzle, the air flow in the pulling direction does not act effectively on the yarn and I can't deliver such a thread. Further, if the insert is simply thinned so as to reach the narrowed portion of the suction nozzle, the size of the slit is also limited, and it becomes impossible to reliably lock the yarn. On the contrary, even if the insert is formed while maintaining a certain thickness, the gap between the insert and the suction nozzle cannot be secured at the time when it reaches the narrowed portion of the suction nozzle, and the secondary air flow does not occur. Therefore, suction cannot be performed well. Further, it is not preferable to strongly set the suction air flow of the guide tube for the same reason as above.

OBJECT OF THE INVENTION The object of the invention is therefore to build on the abovementioned prior art and to ensure that the yarn can be delivered without making the air flow unnecessarily strong.

Therefore, according to the present invention, when the yarn is transferred from one side to the other side by the air flow, by advancing the auxiliary insert from one side toward the suction nozzle,
The yarn is actively guided to the narrowed portion of the suction nozzle so that the air flow in the drawing direction is effectively applied to the yarn.

Therefore, according to the present invention, the yarn is positively guided to the narrowed portion of the suction nozzle, so that the yarn can be reliably delivered with a minimum air flow.

Configuration of the Invention First, FIG. 1 shows the overall configuration of the yarn guiding apparatus 1 of the present invention, and FIGS. 2, 3, and 4 show the configuration of the main part.

The yarn guide device 1 is composed of an insert 2 and a guide tube 3. The insert 2 holds the guided thread 4 in a releasable manner in the pulling direction,
A diametrical slit 6 is formed at the tapered surface 5 at the tip of the tubular body, and is fixed to the tip of a cylindrical holder 7 at the rear end. In addition, this holder 7
The rear end portion is fixed to the bracket 8 and is inserted into the cylindrical guide body 9, which can be moved back and forth by the slide guide body 10 of the holder 7 and the slide guide body 11 on the guide body 9 side. It is held and is biased in the advancing direction by the compression spring 12. The guide body 9 has a slit 13 formed at a position corresponding to the slit 6 of the insert 2.

The insert 2 and the holder 7 internally hold the auxiliary insert 14 in a retractable state.
The front end portion of the auxiliary insert 14 is a holding groove 15, and the rear end portion is connected to a piston rod 19 of an air cylinder 18 by a flexible joint 16 such as a coil spring and a connecting rod 17. The air cylinder 18 is fixed to the side surface of the bracket 8 by a guide member 8a for the connecting rod 17.

On the other hand, the guide tube 3 is provided on the axis of the insert 2 so as to be movable back and forth by a driving means such as an air cylinder (not shown), and at the end portion facing the insert 2,
It is fitted with the nozzle body 20, and further, this nozzle body 20
Are concentrically combined with the suction nozzle 21. The suction nozzle 21 has a suction port 22 formed in the portion on the insert 2 side, and becomes gradually thinner in the thread 4 drawing direction, reaches the inside of the nozzle body 20, and forms an annular gap. It is concentrically combined with the aperture ring 23 at the aperture end on the aperture side. The inside of the nozzle body 20 communicates with the air intake port 24. Then, the nozzle body 20
Has a guide collar 25 fixed at a portion corresponding to the guide body 9, and a pair of holding claws 27 is rotatably supported by a radial fulcrum pin 26, and a coil spring is provided at a rear end portion. 28 urges the tip ends in a direction to contact each other. The tip of the holding claw 27 has a guide collar 25.
The holes 29 reach the vicinity of the suction port 22 and are in contact with each other. The rear end portion of the holding claw 27 corresponds to the fixed cam 34 at the retracted position of the guide tube 3.

And in this embodiment, the thread 4 is a weft thread,
It is supplied by the two yarn feeders 30 and is connected to each other at the winding start end and the winding end end thereof, which is in a so-called transfer tail state.
It is sandwiched by 31 and faces the slits 6 and 13. The yarn 4 from one yarn feeder 30 passes through the large hole of the yarn guide 32, passes through the inside of the suction nozzle 21,
It is guided to the inside of the guide tube 3 and finally reaches a predetermined position, for example, a length measurement storage device (not shown). In addition, this thread 4
Can be cut by a cutter 33 at both sides of the insert 2 as required. The presence of the yarn 4, that is, the state that the yarn is not broken is detected by a photoelectric sensor 35 or the like, for example, between the yarn guide 32 and the guide tube 3.

Action of the Invention The yarn 4 is pulled out from one yarn feeder 30 as shown by the solid line in FIG. 1, passes through the inside of the yarn guide 32 and the guide tube 3,
The length is measured by the length measuring and storage device, and the warp yarn is inserted into the warp yarn opening by a weft inserting nozzle or the like. During this time, if there is no yarn breakage, the sensor 35 confirms the presence of the yarn 4 and does not generate a weft stop signal to the loom. However, the yarn feeder 30
If the thread 4 breaks during reaching from the guide tube 3 to the sensor
The 35 detects the yarn breakage condition, generates a weft stop signal, and automatically stops the loom.

After the loom is stopped, the necessary yarn processing is performed on the side of the length measuring and storing device and the weft inserting device, and then the yarn guiding device 1 of the present invention is
In order to pull out the yarn 4 from the new other yarn feeder 30, the sequential operation required is started.

First, the guide tube 3 is moved in the forward direction from the retracted position by a driving means such as an air cylinder to move the yarn guide.
Move in the direction of insert 2 through 32 large central holes. During this movement, the pair of holding claws 27 is separated from the cam 34 at the rear end thereof, and thus is biased by the coil spring 28 to be in a closed state at the front end portion. As shown in FIG. 2, the guide collar 25 soon enters the inside of the guide body 9 and hits the inner peripheral surface of the guide body 9 to position the suction nozzle 21 concentrically with respect to the insert 2. The guide body 9 is retracted against. In the process of retracting the guide body 9, while the insert 2 is relatively advanced, the thread 4 laid over the slit 13 of the guide body 9 is locked by the slit 6 formed at the tip of the insert 2. The pair of holding claws 27 come into contact with the tape surface 5 of the insert 2 at their tip portions and are guided by the tape surface 5, so that the holding claws 27 are opened. In this way, insert 2
Reaches the suction port 22 of the suction nozzle 21 while holding the thread 4 with the slit 6 at the tip. At this time, since the thread 4 is inside the slit 6, it is separated from the tip portion of the holding claw 27.

When the guide tube 3 moves to the forward limit, compressed air is supplied to the air intake port 24, and at the same time, the air cylinder 18 advances its piston rod 19,
The auxiliary insert 14 is moved to the throttle portion of the suction nozzle 21, that is, the throat portion. As a result, the thread 4 is locked and positioned in the slit 6 of the insert 2 as shown in FIG. 3, so that the thread 4 is securely locked in the holding groove 15 of the auxiliary insert 14 and released from the slit 6. Then, it enters through the suction port 22 of the suction nozzle 21 and reaches the throat portion. Since compressed air is supplied to the air intake port 24, an air flow in the drawing direction is generated inside the guide tube 3, and at the same time, due to the negative pressure phenomenon of the throttle ring 23 inside the suction nozzle 21 as well. , Airflow in the pulling direction is generated. Therefore, the yarn 4 is separated from the holding groove 15 of the auxiliary insert 14 by the air flow inside the suction nozzle 21, rides on the air flow, reaches the inside of the guide tube 3, and can be drawn in the threading direction. Become. Therefore, in this state, the cutter 33
When the yarn 4 is cut and the yarn 4 is cut, the tip of the yarn 4 rides on the air flow, passes through the inside of the suction nozzle 21, and together with the air flow,
It is drawn inside the guide tube 3. In this drawing-in process, the suction port 22 of the suction nozzle 21 is fitted into and blocked by the tapered surface 5 of the insert 2, so that air is supplied from the slit 6 portion toward the inside of the suction nozzle 21. . Therefore, the yarn 4 inside the slit 6 is efficiently drawn into the inside of the guide tube 3 by the air flow inside the slit 6. Even when the auxiliary insert 14 reaches the inside of the suction nozzle 21, the air flow is not blocked because the flow path is not blocked.

After that, the guide tube 3 keeps the air flow applied to the suction nozzle 21 and the suction nozzle 21 and the guide collar.
Retreats with 25. During this retreat, the pair of holding claws 27 separate from the tapered surface 5, so that the coil spring
It is biased by 28 and frictionally holds the thread 4. When the guide tube 3 returns to its original position, the supply of compressed air to the air intake port 24 automatically stops. At the same time, the air cylinder 18 returns the auxiliary insert 14 to its original position by retracting its piston rod 19. In this way, the guide tube 3 receives the new thread 4 from the insert 2 and returns to its original position. At this time, the pair of holding claws 27 hit the cam 34 at the rear end portion and release the yarn 4 at the front end portion, so that the new yarn 4 is guided by the guide tube 3
In the state where the suction nozzle 21 is completely drawn through the inside of the measuring nozzle, it is also released from the frictional constraint of the pair of holding claws 27 and reaches the inside of the rotating yarn guide of the length measuring storage device. ing.

In this way, when the series of operations is completed, the length measurement storage device performs preliminary winding required for the next weft insertion and prepares for restarting the loom. Such a series of operations is sequentially advanced while confirming the completion of the operation of each step by the sequencer.

Other Embodiments of the Invention In the above embodiments, the insert 2 is fixed to the bracket 8 by the holder 7, and the insert 2 is driven by the air cylinder 18.
However, the advancing movement of this auxiliary insert 14 is
It can also be achieved by utilizing the exercise of.

That is, in the embodiment of FIG. 5, the auxiliary insert 14 is fixed to the bracket 8, the insert 2 is integrated with the holder 7, and these are slidable with respect to the auxiliary insert 14. According to this embodiment, the guide color
25 enters the inside of the guide body 9 and retracts the guide body 9 against the compression spring 12. After that, after the step inside the guide body 9 hits the end surface of the slide guide body 10, the stationary auxiliary insert 14 advances relatively to the insert 2 in order to resist the coil spring 36 and further advance. The yarn 4 is guided in the suction nozzle 21.

Further, in all of the above embodiments, the guide tube 3 is on the moving side, but this moving portion may be on the insert 2 side or both the guide tube 3 and the insert 2. Therefore, the insert 2 and the guide tube 3 need only be relatively close to each other.

Note that, in any of the embodiments, the guide body 9 and the pair of holding claws 27 are not particularly required and can be omitted. In order to transfer the yarn 4 more reliably, the auxiliary insert 14 forms a through hole in the auxiliary insert 14 as an injection nozzle, that is, when using FIG. Can be configured to supply

Further, the yarn guiding device 1 is provided between the yarn feeder 8 and the weft yarn length measuring and storing device, but the present invention is not limited to such an application and can be applied to a threading operation for a heald, a reed, etc. . Fig. 6 shows insert 2 with Held 37 inserted.
And the guide tube 3 face each other, and when the guide tube 3 is most advanced toward the heald 37, the auxiliary insert 14 penetrates the hole of the heald 37 to guide the yarn 4 to the narrowed portion of the suction nozzle 21, and This is an example of threading by supplying compressed air to the air intake port 24 and generating an air flow in the drawing direction to the suction nozzle 21.

Advantageous Effects of the Invention In the present invention, when the insert and the suction nozzle approach each other for threading, the auxiliary insert inside the insert moves from the portion of the insert to the inside of the suction nozzle to positively move the thread held by the insert. Since it is sent to the squeezing part inside the suction nozzle, the threading work by the air flow after that is a minimum air flow compared to the threading by the air flow only, and the thread pulling phenomenon such as the twisting of the thread It is surely done without.

[Brief description of drawings]

FIG. 1 is an overall plan view of the yarn guiding device of the present invention, FIGS. 2 and 3 are horizontal cross-sectional views of main parts in respective operating states, and FIG. 4 is a vertical cross-section of insert and auxiliary insert parts. FIG. 5, FIG. 5 and FIG. 6 are horizontal sectional views of another embodiment. 1 ... Thread guide device, 2 ... Insert, 3 ... Guide tube,
4 ... Thread, 6 ... Slit, 7 ... Holder, 9 ... Guide body, 14 ... Auxiliary insert, 15 ... Holding groove, 18 ... Air cylinder, 20 ... Nozzle body, 21 ... Suction nozzle ,twenty two
…… Suction port, 23 …… Aperture ring, 27 …… Holding claw.

Claims (3)

(57) [Claims] 1. A tubular insert (2) holding a guided thread (4) in a releasable state in a pulling direction, and a thread (4) which is relatively accessible to this insert (2). A guide tube (3) which is pulled through to the inside and guided to a predetermined position. The insert (2) holds the thread (4) inside and is an auxiliary insert (which can advance in the pulling direction with respect to the insert (2). 14), and the above guide tube (3)
Has a suction nozzle (21) which fits on the tip of the auxiliary insert (14) on the same axis as the auxiliary insert (14). 2. The yarn guide device (1) according to claim 1, wherein the auxiliary insert (14) is connected to the advancing / retreating drive source (18) at the rear end portion. 3. The yarn guide according to claim 1, wherein the insert (2) is biased toward the fixed auxiliary insert (14) by a spring (36) in the advancing direction. Device (1).