JPH0318527Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a weft insertion device in a jet room that inserts a weft into a warp opening using a jet of fluid.

(Prior Art) In a jet room, it is necessary to measure and store a predetermined amount of weft supplied from a weft supply source each time weft is inserted, and one such storage device has conventionally been used to store weft on a drum. A drum pool type storage device is used, which measures and stores the length of the material by wrapping it around the material. Normally, in this storage device, the weft yarn intersects with the yarn winding surface on the drum and is locked by a weft locking body that is spaced from the winding surface, thereby stopping the flying of the weft yarn and completing weft insertion. Therefore, at the end of weft insertion, the flight speed of the weft yarn rapidly decreases to zero, and the reaction causes a problem in that yarns with weak yarn strength are broken.

Therefore, a brake lever is disposed near the weft path between the weft storage device and the main nozzle for weft insertion, and near the end of weft insertion, the lever is brought into contact with the weft to apply the brake, thereby removing the weft from the weft storage device. Mechanical braking means have been proposed to alleviate the sudden drop in the drawing speed, or to provide a gripper on the weft path and narrow the opening of the gripper near the end of weft insertion to apply a brake to the weft. There is.

(Problem to be solved by the invention) However, in both of the above braking means, it is difficult to apply appropriate braking due to contact resistance due to the random behavior of the running weft yarn, and even more so due to the random behavior of the running weft yarn. It is even more difficult to fine-tune the braking level depending on the yarn count. Moreover,
It is unavoidable that fluff adheres to the braking members of both of the braking means, and the fluff is brought into the main nozzle for inserting the weft together with the weft, causing a clog in the nozzle, or causing the fluff to adhere to the woven fabric together with the weft. Inconveniences such as weaving and flaws may occur.

JP-A No. 57-77356 discloses that when the loom is running, an injection port is provided in the direction opposite to the traveling direction of the weft thread in the yarn guide groove, and air is injected from the injection port to brake the running of the weft thread, thereby preventing weft thread breakage. A nozzle device is disclosed in which the injection port can be directed in the direction of progress of the weft yarn when the machine operation is stopped due to occurrence of such a problem. With this nozzle device, it is easy to adjust the braking effect on the weft by adjusting the injection pressure, and the influence of fluff can also be avoided.

However, in this nozzle device, the air for weft braking is constantly injected, so the injection pressure from the main nozzle for weft insertion must be increased accordingly to maintain the weft propulsion force, and the weft insertion ends. It is not possible to alleviate the sudden decrease in the weft drawing speed during the process.

Structure of the Invention (Means for Solving the Problems) Therefore, the present invention provides a weft insertion injection unit that injects fluid in the advancing direction of the weft thread during weft insertion of the weft thread pulled out from the weft storage device, and a weft insertion injection unit that injects fluid in the advancing direction of the weft thread while the weft thread is being inserted while the weft thread is being pulled out from the weft storage device. A nozzle equipped with a braking injection unit that injects fluid in a direction opposite to the traveling direction of the weft to brake the progress of the weft at a predetermined time of the A means is adopted in which an on-off valve is disposed on the weft path and is interposed in the fluid supply path to switch the operating timing of the weft insertion injection section and the braking injection section.

(Function) That is, at the start of weft insertion, fluid is injected from the weft insertion injection part of the nozzle in the weft traveling direction within the weft guide passage, and the weft is accelerated by the jet flow. For example, in the case of a drum pool type weft storage device, at a predetermined time near the end of weft insertion, fluid is injected from the braking injection part of the nozzle in the direction opposite to the traveling direction of the weft within the weft guide passage, and the weft A brake is applied to the progress of the vehicle. Therefore, a sudden drop in the weft withdrawal speed from the weft storage device at the end of weft insertion is alleviated, and the posture of the weft is maintained in a straight line, so that good weft insertion is performed without yarn breakage. Moreover, since the contact resistance of the jetting fluid against the weft in the weft guide passage is uniform regardless of the random behavior of the weft, a stable braking effect can be obtained, and the degree of braking can be easily adjusted by controlling the jetting pressure. be able to.

(Example) Hereinafter, examples 1 to 3 that embody the present invention will be described.
This will be explained based on the diagram.

As shown in FIG. 1, the weft Y supplied from the cheese 1 is measured and stored in a weft storage device 2. This weft storage device 2 is an example of the above-mentioned drum pool system, and a rotary support shaft 4 is rotatably inserted through a support bracket 3 fixed to a fixed part such as a side frame of a loom. A weft guide hole (not shown) is formed in the shaft center. The rotation support shaft 4 is operatively connected to a machine drive source (not shown) via a timing pulley 4a and a timing belt 5, and is configured to rotate in synchronization with the operation of the machine. A gear 6 is fixed to the front surface of the support bracket 3, and a support body 7 is fixed to the rotary support shaft 4 on the front side thereof. A thread winding tube 8 which is obliquely intersecting with the rotation support shaft 4 and communicated with the weft guide hole is mounted and supported on the support body 7, and its tip opening is arranged on the thread winding surface of the drum 12, which will be described later. ing. A support tube 9 is supported on the front side of the support body 7 so as to be rotatable relative to the rotary support shaft 4. A gear 9a is integrally formed on the circumferential surface of the support tube 9, and the drum 10 is mounted on the front surface of the support tube 9. It is attached. Further, a planetary gear mechanism is fixed to the support 7, and its input planetary gear 1
1 is meshed with the gear 6, and the output planetary gear 12 is meshed with the gear 9a. Then, when the rotational support shaft 4 is rotated, the thread-wound tube 8 rotates integrally with the rotational support shaft 4, and the planetary gear mechanism also rotates integrally, so that both the planetary gears 11 and 12 are connected to the gears 6 and 9.
revolving around the rotation support shaft 4 while meshing with a,
The drum 10 is held stationary without rotating.

A pair of weft locking bodies 13 and 14 are disposed near the bobbin winding surface in the drum 10 so as to be retractable from the bobbin winding surface. It is interlocked with a cam mechanism (not shown) provided therein, so that it alternately moves in and out of the bobbin winding surface for one rotation of the machine.

An auxiliary weft insertion nozzle 15 is disposed on the weft path in front of the weft storage device 2. To explain the structure of the auxiliary nozzle 15 in detail, as shown in FIGS. 2 and 3, a weft insertion injector 17 as a weft insertion injection part is ejected from the rear end of the nozzle body 16 in the direction of the insertion hole 16a in the nozzle body 16. A braking injector 18 as a braking injection part is also fitted and fixed so as to face the front end. Annular fluid guide passages 19 and 20 are formed around the tapered peripheral surfaces of the tips of both injectors 17 and 18, and communicate with fluid supply ports 21 and 22 having threaded portions. An acceleration tube 23 is fitted and fixed to the base end (right end in FIGS. 2 and 3) of the braking injector 18, and forms a linear weft guide path together with both injectors 17, 18 and the insertion hole 16a. There is.

Fluid supply pipes 24 and 25 as fluid supply paths are screwed to the fluid supply ports 21 and 22, respectively, and as shown in FIG. The other supply pipe 25 is connected to a compressed fluid supply tank 27, and the other supply pipe 25 is connected to a solenoid valve 28 as an on-off valve.
and is connected to the supply tank 27 via a throttle valve 29.

A weft insertion main nozzle 30 is disposed in front of the weft insertion auxiliary nozzle 15, and the weft yarn Y is transferred from the weft storage device 2 to the weft insertion auxiliary nozzle 15.
is guided to the main nozzle 30 for weft insertion via
The weft is injected from the main nozzle 30 into the warp opening. The weft insertion main nozzle 30 is connected to a compressed fluid supply tank (not shown) via a mechanical valve 31 that opens and closes in synchronization with the rotation of the machine.

In this embodiment, one of the electromagnetic valves 26 is set to be opened in synchronization with the start of weft insertion and closed near the end of weft insertion, and the other electromagnetic valve 28 is set to be closed near the end of weft insertion. The solenoid valve 26 is opened at the same time as the solenoid valve 26 is closed, and is set to be closed at the same time as the weft insertion is completed.

Note that it is also possible to employ a mechanical valve similar to the mechanical valve 31 described above instead of the electromagnetic valve.

Further, the switching timing of the valve 28 may be such that the valve 26 is opened after a predetermined period of time has elapsed after the valve 26 is closed.

Now, as the machine is operating, the thread winding tube 8 rotates, and the weft yarn Y is supplied onto the thread winding surface.
A pair of weft locking bodies 13 and 14 appear and disappear alternately.
The length of the weft for one weft insertion is measured by the locking action of both weft locking bodies 13 and 14, and the weft is wound and stored on the winding surface by the locking action of the weft locking body 14 protruding from the winding surface. be done. When it is time to start weft insertion, the valve 31 and the electromagnetic valve 26 are opened, the weft locking body 14 locking the stored weft retracts, and the weft locking body 13 protrudes. By opening the electromagnetic valve 26, the auxiliary weft insertion nozzle 1
5, fluid is injected into the weft guide passage through the supply pipe 24 and the fluid guide passage 19 as shown by arrows in FIG. 2, and the weft Y is accelerated in the advancing direction (weft insertion direction) within the guide passage. be affected. In other words, the weft yarn Y is inserted into the main nozzle 3 for weft insertion.
0 and the auxiliary weft insertion nozzle 15, the yarn is pulled in the weft insertion direction and ejected into the warp shedding. Therefore, compared to the conventional weft insertion method in which the weft is inserted only by the main weft insertion nozzle 30, a sufficient weft flight speed can be obtained with a reduced injection pressure in the main nozzle 30, and a high injection pressure can be obtained. Thread breakage caused by this can be prevented.

The weft yarn Y flying within the warp shedding is accelerated one after another, and sufficient acceleration is obtained near the end of weft insertion. At this point, the electromagnetic valve 26 is closed to stop the fluid injection from the injection part on the side of the weft insertion injector 17, and the other electromagnetic valve 28 is opened, and the fluid is injected as shown by the arrow in FIG. It is injected into the weft guide channel through the supply pipe 25 and the fluid guide channel 22. Therefore, a brake is applied to the weft yarn Y traveling in the weft insertion direction,
As the weft withdrawal speed from the weft storage device 2 gradually decreases, an appropriate tension is applied to the weft yarn Y flying in the warp opening, and the posture of the flying weft yarn Y is in a straight line state. It holds well. Since this braking is based on the contact action of fluid, a uniform action is always performed regardless of the random behavior of the weft yarn Y traveling in the weft guide path, and a stable braking effect can be obtained. When the weft insertion end time is reached, the stored weft Y on the drum 10 is locked by the protruding weft locking body 13, stopping the withdrawal of the stored weft from the drum 10, and the weft insertion is completed. At this time, the auxiliary weft insertion nozzle 15
Since the weft withdrawal speed from the weft storage device 2 is reduced due to the braking action in The resulting thread breakage is avoided.

At the end of weft insertion, the electromagnetic valve 28 is closed, and fluid injection from the injection section on the braking injector 18 side is stopped. Then, the weft threads inserted into the warp opening are beaten and woven into a woven fabric. In order to adjust the degree of braking on the weft yarn, it is only necessary to adjust the fluid injection pressure by operating the throttle valve 29, and the adjustment operation is simpler than with mechanical braking means. Furthermore, it is possible to make fine adjustments according to the yarn type or yarn count, and the auxiliary weft insertion nozzle 15 can be used even for special yarns such as slub yarns, or yarns with extremely weak yarn strength. can. Furthermore, in this embodiment, if the opening and closing of the electromagnetic valve 26 can be controlled by pressing a push button, threading through the weft insertion auxiliary nozzle 15 will be easy even in the unlikely event that the thread breaks. It is.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG.
The weft insertion injector 35 and the braking injector 36 are fitted and fixed into the main bodies 33 and 34, respectively, to form a weft insertion injection part and a braking injection part, thereby forming an auxiliary weft insertion nozzle 37. You may.

Alternatively, as shown in FIG. 5, a plurality of weft yarns Y1 and Y2 supplied from a plurality of weft supply sources (38 and 39 in the illustrated case) are inserted through a pair of weft insertion main nozzles 40 and 41. In this case, it is also possible to arrange and use the auxiliary weft insertion nozzle 15 corresponding to each weft, and the auxiliary weft insertion nozzle 15 of the first embodiment is used as the main weft insertion nozzle. You can also.

Furthermore, the present invention is applicable not only to a drum pool type weft storage device but also to an air pool type weft storage device in which the length of the weft is continuously measured by a length measuring roller mechanism and is ejected and stored in a storage pipe. In this case, the target is a sudden decrease in the weft withdrawal speed when all the stored wefts in the storage pipe are pulled out.

Furthermore, the present invention can also be applied to a weft storage device having a weft adhesion storage surface for adhering the weft ejected from the storage nozzle.

Effects of the invention As detailed above, the weft inserting device of the present invention assists weft insertion during weft insertion, and at a predetermined time, brakes are applied to the weft by a jet of fluid. This has an excellent effect in that it is possible to perform good weft insertion while alleviating a sudden decrease in the speed of drawing out the weft from the device and avoiding yarn breakage.

[Brief explanation of drawings]

1 to 3 show an embodiment embodying the present invention, and FIG. 1 is a side view showing the auxiliary weft insertion nozzle arranged between the weft storage device and the main weft insertion nozzle, and FIG. Figures 2 and 3 are both longitudinal sectional views showing the action of fluid, Figure 4 is a vertical sectional view showing another example of the auxiliary nozzle for weft insertion, and Figure 5 is a longitudinal sectional view showing another example of the auxiliary weft insertion nozzle. FIG. 2 is a side view showing an embodiment of the invention. Weft storage device...2, Auxiliary nozzle for weft insertion...
15, 37, Weft inserting injector as a inserting injection unit... 17, 35, Braking injector as a braking injection unit... 18, 36, Solenoid valve as an opening/closing valve... 26, 28, Weft thread... Y.

Claims (1)

[Scope of utility model registration request] a weft insertion injection unit that injects a fluid in the traveling direction of a weft thread pulled out from a weft storage device while the same weft thread is being inserted; A nozzle equipped with a braking jet that brakes the progress of the weft is disposed on the weft path on the downstream side of the weft storage device with respect to the weft traveling direction, and the weft insertion jet and the braking nozzle are provided with a A weft insertion device in a jet room that has an on-off valve in the fluid supply path that switches the timing of operation with the injection section.