JPH0361784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a weft treatment device for a fluid jet loom.

(Prior Art) In recent years, the speed of looms has been significantly increased in order to improve the productivity of looms, and there is a tendency for fluid jet looms to be widely used for this purpose. In this fluid injection type loom, the weft to be inserted is measured in advance to a predetermined length and stored, and the stored weft by a predetermined amount is injected from the main nozzle for weft insertion into the jet fluid in synchronization with the weaving timing. It is now possible to insert the injection weft.

In general, the incidence of weft insertion mistakes in fluid injection looms is higher than in shuttle looms, but if a weft insertion error occurs, the loom must be stopped to maintain the quality of the woven fabric. It is necessary to take care of weft insertion errors. The loom is stopped based on the weft insertion error detection signal from the weft detection device, but in order to prevent damage to various parts of the high-speed loom, the loom
Since the machine is stopped after the machine has inertia operated over rotation, if a mechanical valve that opens and closes in synchronization with the rotation of the machine is used as a valve to control the fluid supply to the main nozzle for weft insertion, Not only are the weft yarns that have been inserted incorrectly (hereinafter referred to as erroneous yarns) beaten and woven into the woven fabric before the machine stops, but even the weft yarns that follow the erroneously inserted yarns are also reeded and beaten. Therefore, when the machine is reversed to release the grip of the misplaced yarn by the warp threads and remove the misplaced yarn, the weft thread that has been beaten following the misplaced yarn must first be removed. However, even when the warp threads are in the maximum opening state, the grip of the weft threads by the warp threads is not released sufficiently, so it is not easy to remove the same weft threads, and the removal work becomes very complicated, and the removal of the mistaken threads must be carried out subsequently. Combined with the work, this causes the loom to stop for a long time, impeding the improvement of the productivity of the loom.

Even if an electromagnetic valve is used instead of the mechanical valve described above to control the fluid supply to the main nozzle for weft insertion, it is necessary to keep the amount of weft stored at a constant level after the machine stops. It is not possible to stop or weaken the fluid jet from the weft yarn, and the weft yarn following the missed yarn is inserted, resulting in the same problem as described above.

Furthermore, if the warp threads are cut during weaving, or if the loom is artificially turned off, the loom will stop after making one or more inertial revolutions, as described above. During this inertial operation state, the weft threads are woven into the woven fabric, but since the loom is in a deceleration state, the beating state of the weft threads is different from that of other weft threads, resulting in defects such as weaving steps in the woven fabric.

Therefore, it is desirable to prevent the weft insertion of the weft yarn that is inserted following the above-mentioned erroneous yarn, or of the weft yarn that is inserted during the inertial operation. Therefore, for example, in Japanese Patent Application Laid-open No. 58-197339, a blocking plate is protruded from the reed side on the weft path in front of the main nozzle for weft insertion, and the weft thread following the miss yarn is blocked and guided by the blocking plate. A weft processing means has been disclosed that suctions the weft into a suction pipe and cuts and separates the sucked weft from the main nozzle for weft insertion using a cutter provided near the tip of the main nozzle for weft insertion.

(Problem to be Solved by the Invention) However, in order to prevent weft insertion of a weft yarn following a missed yarn, the blocking plate must be projected onto the weft path in front of the main nozzle at the latest at the start of injection of the same weft yarn. However, since the weft injection starts during the retreat of the main nozzle after beating the reed, the protrusion stroke of the blocking plate that is protruded from the reed side to the front of the main nozzle becomes large. As a result, it takes time for the blocking plate to protrude, and there is a risk that weft insertion cannot be effectively prevented.To solve this problem, the response performance of the blocking plate driving device must be extremely high. be. Moreover, since the distance between the tip of the main nozzle and the warp opening entrance is small, in order to make the blocking plate protrude in front of the main nozzle, it is necessary to form a window for passing the blocking plate in the reed on the main nozzle side.

In addition, since the suction pipe must be placed outside the swing range of the main nozzle, the distance between the suction pipe and the weft path in front of the main nozzle becomes large, causing the weft to collide with the blocking plate and be scattered. There is a problem in that the weft yarn is disturbed by the fluid jetted from the main nozzle, and the suction action of the weft yarn lacks stability, and as a result, the suction force must be increased.

Furthermore, it is necessary to shorten the length of the weft from the main nozzle tip after cutting the weft to prevent the weft tip from getting caught in the warp opening entrance during weft insertion, so the weft is cut when the main nozzle is in the most retracted position. There is the inconvenience of having to do this because you have no choice.

Structure of the Invention (Means for Solving Problems) A weft is inserted into a warp opening by a fluid jet from a main nozzle for weft insertion, and the main nozzle for weft insertion is disposed between the main nozzle for weft insertion and a woven fabric. In a fluid injection type loom that cuts the weft yarn with the first cutting member that is cut, a weft suction pipe is connected to a part of the acceleration tube of the weft insertion main nozzle in a direction intersecting the acceleration tube, and A weft introduction member was disposed to face the suction pipe across the weft insertion injection passage of the accelerating tube, and a second cutting member was disposed on the weft passage path of the weft suction pipe.

(Function) That is, in the present invention, the weft is about to be inserted during the inertial operation of the machine before the machine is stopped based on the machine stop signal, but the weft is inserted by the weft insertion jet of the accelerator tube. The weft thread is guided from the passage into the weft suction pipe by a weft introduction member. Then, it is cut by a second cutting member at a predetermined position on the weft passage path of the weft suction pipe.

(Example) Hereinafter, examples 1 to 4 embodying the present invention will be described.
This will be explained based on the diagram.

The weft yarn Y supplied from the cheese 1 is ejected from the storage nozzle 4 while being measured by feed rollers 2 and 3 as a length measuring roller mechanism driven in synchronization with the rotation of the loom, and is ejected from the storage nozzle 4 at the weft insertion timing of the loom. When the weft gripping gripper 5, which is opened and closed synchronously, is closed, the weft Y is ejected and stored in the direction of the storage pipe 6 having the slit 6a. The feed rollers 2 and 3 are separated by a drive mechanism (not shown) such as an air cylinder or an electromagnetic solenoid when the machine is stopped, so that the length measurement function is eliminated.
The weft yarn Y passing through the guide hole 7 and the gripper 5 is introduced into a weft insertion main nozzle 10 mounted on a reciprocating slay 8 via a mounting table 9.

The threads are ejected from the main nozzle for weft insertion 10 by a row of guide holes 12a of a large number of weft guide members 12 arranged in parallel on the slay 8 facing the reed 11 in front of the acceleration tube 10a of the main nozzle for weft insertion 10. A guide path S for the weft Y is formed. If the weft Y ejected from the main weft insertion nozzle 10 is inserted normally and reaches the edge of the woven fabric W on the side opposite to the main nozzle, the weft Y during beating
escapes from the guide hole 12a through the slit 12b, and the same weft thread is driven into the front of the woven fabric W to form the woven fabric W.
The cutter 13 serving as a first cutting member is provided near the end of the woven fabric W on the main nozzle side. Then, the subsequent weaving operation is continued.

If a weft insertion error occurs in which the weft yarn Y does not reach the fabric edge on the side opposite to the main nozzle, a weft detector (not shown) provided on the weft guide member 12 corresponding to the vicinity of the fabric edge will detect the weft insertion. A mistake is detected and the machine is stopped based on a weft insertion mistake detection signal from the detector. This weft detector consists of light emitting/receiving elements arranged opposite to each other across the slit 12b of the weft guide member, and emits a weft insertion error detection signal when the weft does not pass through the slit 12b during beating.

An air blow pipe 14 as a weft introduction member connected to a compressed air supply source P via an electromagnetic valve V at the front of the acceleration tube 10a of the main nozzle for weft insertion 10 is connected to the acceleration tube 10a through the upper surface of the acceleration tube 10a. A suction pipe 15 connected to the weft inserting jet passage 10b inside the weft inserter and to a suction device M is guided upward from the bottom surface of the slay 8 and passes through the bottom surface of the acceleration pipe 10a below the connection part. It is connected to the weft insertion injection passage 10b through the weft inserting jet passage 10b. The electromagnetic valve V and the suction device M are operated based on the weft insertion error detection signal (which is also a machine stop signal). A notch 15a is formed in the suction pipe 15 at an intermediate position between the acceleration pipe 10a and the sleigh 8 and opens toward the main nozzle 10 for weft insertion.

A support base 16 is fixedly installed on the sleigh 8 between the mounting base 9 and the suction pipe 15, and a cylindrical support protrusion 16a is protruded from the upper surface of the front end side of the support base 16. A shaft pin 18 is fitted and fixed on the upper surface of the protrusion 16a, and a fixed blade 17A is fixedly supported on the upper side thereof. And, between the fixed blade 17A and the supporting protrusion 16a, a rotary blade 17B is connected to the shaft pin 18.
The fixed blade 17A and the rotating blade 17B constitute a second cutting member. The upper surface of the support protrusion 16a is set near the height of the notch 15a of the suction pipe 15, and the tips of the double blades 17A, 17B are always arranged around the notch 15a. Support stand 1
An air cylinder 19 is mounted on the upper surface of the rear end of the blade 6, and its driving rod 19a is operatively connected to the proximal side of the rotary blade 17B. Then, based on the operation of the air cylinder 19, the rotary blade 17B is rotated clockwise in FIG.
It's starting to move inside. Air cylinder 1
9 is designed to be performed after the machine has stopped.

Now, when a weft insertion error occurs, during reeding,
That is, at the time when the weft yarn escapes from the slit 12b, a weft insertion error detection signal is generated from the weft yarn detector, and the electromagnetic valve V and the suction device M are activated. Therefore, compressed air is supplied from the compressed air supply source P into the air blow pipe 14 to generate a compressed air flow, and a suction air flow is generated within the suction pipe 15. As a result, a strong air flow (indicated by F in FIG. 4) is generated across the weft insertion injection passage 10b between the air blow pipe 14 and the suction pipe 15. Since the supply of compressed air into the air blow pipe 14 is controlled by opening and closing the electromagnetic valve V which responds at high speed, the air flow F is formed in an extremely short time. In other words, the air flow F can be formed before the weft is ejected from the weft insertion main nozzle 10 which is on the way back together with the sley 8 after the beating is completed, and the weft Y to be inserted following the miss yarn. The tip of the weft Y is introduced into the suction pipe 15 as shown in FIG. 4, and the tip of the weft Y almost reaches the position of the notch 15a. Then, the weft insertion main nozzle 10 is operated in synchronization with the weft insertion timing, and the weft insertion injection passage 10 in the acceleration pipe 10a
A compressed air flow is generated at point b, and the weft Y is about to be ejected, but the ejection of the weft Y is prevented by the air flow F, which is substantially perpendicular to the injection passage 10b, and all of the weft Y is introduced into the suction pipe 15. Therefore, weft insertion of the weft yarn Y following the missed yarn is reliably prevented, and the high responsiveness of such weft insertion prevention makes it possible to cope with the trend toward higher speeds of the loom.

1 after the weft insertion error detection signal is issued.
It rotates more than once due to inertia and stops just before the beating. That is, the machine stops at a machine rotating angle position where the main weft insertion nozzle 10 becomes inactive. When the machine is stopped, the air cylinder 19 is actuated, the drive rod 19a protrudes, and the rotary blade 17B rotates around the shaft pin 18 and enters the notch 15a. As a result, the weft yarn Y being suctioned into the suction pipe 15 is cut, and the cut yarn piece is suctioned and removed. After the cut thread piece is removed by suction, the operation of the electromagnetic valve V and the suction device M is stopped.

Since the weft yarn Y introduced into the suction pipe 15 in this way is cut within the same pipe 15, it is always cut and separated into a predetermined length regardless of the rotation angle position of the machine, and when the machine is restarted, the acceleration is accelerated. tube 10
The yarn length from the tip a is constant. Therefore, after all of the weft yarns Y have been introduced into the main nozzle for weft insertion 10 following the missed yarn, the weft yarn Y can be cut at any time, and the selection range of the weft cutting timing is widened, and it is possible to cut the weft yarn Y at any time. Thus, it is no longer necessary to set the cutting timing only at the machine rotation angle position that provides the optimum cutting yarn length.

Note that if the weft cutting position, that is, the position of the notch 15a is set as in this embodiment, the yarn length from the acceleration tube 10a will always be constant immediately before weft insertion. Of course, the weft cutting position can also be appropriately set so that the yarn length is suitable for a state different from normal operation such as when restarting the machine.

Further, in this embodiment, the weft yarn Y is cut by the operation of the air cylinder 19 after the machine is stopped, but it is also possible to configure the weft yarn cutting device to be manually operated.

After the machine is stopped, the feed rollers 2 and 3 are separated by an air cylinder or solenoid (not shown), and the length measurement function is canceled.The machine is reversed by a predetermined amount and the reed 11 is stopped at the most retracted position. It is separated from the cloth W. After processing this error yarn, the loom is reversed by a predetermined amount and stopped at the most suitable loom rotation angle position for restarting, and the length measuring function of the length measuring roller mechanism is restored to resume operation of the loom.
Weft insertion of the weft yarn is carried out immediately before weft insertion of the miss yarn.

In this embodiment, in addition to achieving the above-mentioned effects, the air blow pipe 14 and the suction pipe 1
5, the mechanism can be simplified, and both pipes 14 and 15 are connected to the main nozzle 1 for weft insertion.
Since it is connected to the tip of the reed, it does not affect the arrangement of the reed, and a normal reed can be used.

In this embodiment, we have referred to the stoppage and restart of the machine due to the occurrence of a weft insertion error, but even in the case of stoppage and restart of the machine due to other reasons, the injection passage for weft insertion in the main nozzle 10 for weft insertion is 1
An air flow F crossing 0b is formed, and weft insertion of the weft yarn is prevented.

Of course, the present invention is not limited to the above-mentioned embodiments; for example, the suction device M may be omitted and a dust box may be connected to the suction pipe 15, or the air blow may be stopped after weft insertion is blocked to provide only the suction air flow. Alternatively, the embodiments shown in FIGS. 5 to 12 are also possible.

5 to 7 each show another example of the second cutting member, in which the blade 21 is fixed to the tip of the drive rod 20a of the electromagnetic solenoid 20 mounted on the sleigh 8. When the electromagnetic solenoid 20 is excited, the drive rod 20a protrudes and the blade 21 comes into contact with the inner wall of the suction pipe 15, cutting the weft Y.

In FIG. 6, a heater wire 22 is inserted into the notch 15a, so that the weft yarn Y is cut by the heat of the heater wire 22.

In FIG. 7, the suction pipe 15 is guided in a bent manner toward the upper surface of the sleigh 8, and a blade piece 23 is provided on the convex side of the bent portion. Therefore,
When the weft yarn Y is completely introduced into the suction pipe 15, it is cut at the blade piece 23 due to the tension of the weft yarn Y.

In the embodiment shown in FIG. 8, a substantially U-shaped auxiliary body 24 is fitted and fixed to the tip of the main nozzle 10 for weft insertion, and an air blow pipe 14 penetrates the bent piece 24a from above. A suction pipe 15 is provided through the lower bent piece 24b from below, facing the air blow pipe 14. That is, the auxiliary body 24 is a part of the acceleration tube 10a of the main weft insertion nozzle 10, and an air flow F is formed at the leading end of the acceleration tube 10a to introduce the weft into the suction pipe 15. Therefore, suction pipe 1
Introducing the weft into the interior of the weft 5 can be carried out more easily and reliably.

In the embodiment shown in FIGS. 9 to 11, an electromagnetic solenoid 25 is mounted on the sleigh 8 corresponding to the tip of the main weft insertion nozzle 10, and its driving rod 25a projects upward. There is. The acceleration tube 1 is attached to the tip of the drive rod 25a.
A weft pushing member 26 as a weft introducing member having an annular weft engaging portion 26a having the same diameter as 0a is connected to the accelerating tube 1.
It is fitted into a notch 10c at the tip of 0a so as to be able to move upward, and the notch 10c is normally closed. A suction pipe 15 is connected to the upper side of the acceleration tube 10a so as to cover the notch 10c, and although not shown in the drawing, the suction pipe 15 has a fixed blade 17A and a rotary blade as in the previous embodiment. A second cutting member consisting of 17B is provided. In this example,
When the machine stop signal is issued, electromagnetic solenoid 2
5 is excited, the weft pushing member 26 is moved upward, and the tip of the weft Y is pushed into the suction pipe 15 by the weft engaging portion 26a. That is, the weft pushing member 26 plays the role of blowing air from the air blow pipe 14 in each of the above embodiments.

In addition, as shown in FIG. 12, the weft pushing member 26
The airflow ejected from the main nozzle 10 for weft insertion may be blocked and the airflow may be guided into the suction pipe 15.

Furthermore, in the present invention, the length measurement function of the feed rollers 2 and 3 shown in FIG. It is also possible to prevent weft insertion and then introduce the same weft yarn into a side passage connected to the weft insertion injection passage 10b, for example after the machine is stopped. Alternatively, the weft thread gripper 5 may be driven by an electromagnetic solenoid and the solenoid may be controlled based on the machine stop signal to prevent weft insertion, and then the weft thread may be introduced into the side path as described above. In this case, the generation of airflow in the side channel may be performed automatically based on the machine stop signal, but it may also be performed by pressing a button after the machine has stopped.

Effects of the Invention As described in detail above, the present invention uses a simple mechanism to reliably handle the weft yarn that is about to be inserted during the inertial operation of the machine to prevent it from being inserted and to prevent it from colliding with the reed blades, etc. Moreover, it is possible to cope with the increase in the speed of the loom, and even if the weft cutting timing is set regardless of the rotational angle position of the loom, the second cutting can be performed on the weft passing path of the suction pipe. The arrangement of the parts enables reliable cutting, and since the yarn length from the tip of the main nozzle for weft insertion after cutting is constant, it is easy to set the cutting time, and it can be applied to looms that use standard reeds. It has excellent effects.

[Brief explanation of drawings]

1 to 4 show an embodiment embodying the present invention, FIG. 1 is a schematic plan view showing the vicinity of the length measuring device and weft insertion device, and FIG. 2 is a perspective view of the vicinity of the main nozzle for weft insertion. , Fig. 3 is a partially cutaway side view, Fig. 4 is a partially cutaway side view showing changes from Fig. 3, and Figs. 5 to 7.
The figures are all a broken side view of the main part showing another example of the second cutting member, FIG. 8 is a perspective view of the main part showing another example of the present invention, and FIGS. 9 to 11 are one embodiment using a weft pushing member. An example is shown in Fig. 9, a partially cutaway side view of the main part, and Fig. 10.
The drawings are an enlarged cross-sectional view taken along the line A--A in FIG. 9, FIG. 11 is a vertical cross-sectional view of a main part showing a change from FIG. 10, and FIG. 12 is a vertical cross-sectional view of a main part showing another example. Main nozzle for weft insertion...10, acceleration tube...1
0a, weft insertion injection passage...10b, cutter as a first cutting member...13, air blow pipe as a weft introducing member...14, suction pipe...
...15, Fixed blade as second cutting member...17
A, Rotary blade...17B, Same blade...21, Heater wire...22, Blade piece...23, Electromagnetic valve...
...V, compressed air supply source...P, suction device...M,
Weft...Y.

Claims (1)

[Claims] 1 Inserting the weft into the warp opening by fluid jetting from the main nozzle for weft insertion, and cutting the weft by a first cutting member disposed between the main nozzle for weft insertion and the woven fabric. In a fluid injection type loom, a weft suction pipe is connected to a part of the acceleration pipe of the main weft insertion nozzle in a direction crossing the acceleration pipe, and the weft suction pipe is connected across the weft insertion injection passage of the acceleration pipe. A weft processing device for a fluid jet loom, comprising: a weft introducing member facing a suction pipe; and a second cutting member disposed on a weft passage path of the weft suction pipe.