JPH0431269Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a weft end tensioning device for a shuttleless loom.

(Prior art) After weft insertion in a shuttleless loom, where the leading end of the weft thread is free, it is necessary for the leading end of the weft thread to capture the weft thread and apply appropriate tension to it. Publication No. 60-63580 and Utility Model Publication 1986
-Disclosed in Publication No. 89291. In all of these conventional devices, the weft tip is introduced into the trapping pipe by an air flow that intersects with the weft guide path, and this air flow is installed opposite the trap pipe with the weft guide path in between. It is formed by the jet stream from the jet nozzle.

(Problem to be solved by the invention) In order to bend and introduce the weft tip into the capture pipe at a substantially right angle against the air flow in the weft guide passage that conveys the weft, and to apply appropriate tension. must generate a sufficiently powerful airflow. However, in order to spray and guide the weft tip, which is guided flying through the weft guide path, into the capture pipe without interfering with the nozzle forming member, it is necessary to set the injection port of the injection nozzle outside the weft guide path. , the distance between the injection port of the injection nozzle and the capture port of the capture pipe becomes relatively large. This distance relationship becomes an impediment to proper air flow formation, and it is difficult to obtain smooth and efficient capture and tension application of the weft yarn tips by the air flow.

Structure of the invention (Means for solving the problem) Therefore, in the present invention, a spray nozzle is installed near the weft guide path corresponding to the outside of the fabric edge on the non-weft insertion side, and the spray nozzle is placed at the rear of the machine. A guide slope for guiding the weft tip to the jetting port is provided extending outward from the weft inserting side weft guiding path from the vicinity of the jetting port, and the jetting flow of the jetting nozzle is A capture port for introducing the gas was set opposite to the injection port.

(Function) That is, the weft tip that has been guided flying in the weft guide passage is guided to the jetting port in the weft guiding passage by the guiding action of the guide slope, and is subjected to the spraying action of the jetting fluid from the jetting port. . As a result, the weft tip is pushed into the trapping port, and tension is applied to the weft due to the cooperative action of the air flow intersecting the weft guide path and the bending resistance of the weft. Since the jetting port is inserted into the weft guide path, the distance between the jetting port and the trapping port is considerably shorter than in the conventional device. Therefore, the airflow generated between the injection port and the trapping port becomes strong enough to smoothly bend and introduce the weft tip to the trapping port against the weft conveying fluid flow in the weft guide passage, thereby imparting weft tension. is also carried out properly.

(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, a photoelectric weft detector 3 is fastened and fixed in the mounting groove 2a on the front surface of the slay 2 that supports the deformed reed 1 so that the mounting position can be adjusted in correspondence with the outer vicinity of the cloth edge of the woven fabric W. The presence or absence of the weft yarn Y being guided in flight in the weft yarn guide path S on the front surface of the deformed reed 1 is detected by jetting fluid from a main nozzle for weft insertion (not shown) and an auxiliary nozzle installed in the attachment groove 2a. It's becoming like that.

A jet nozzle 4 is fastened and fixed in a mounting groove 2a on the outer side of the weft yarn detector 3 so that its mounting position can be adjusted, and the jet nozzle 4a is inserted into the weft guide path S toward the rear of the machine. There is. Injection nozzle 4
is connected to an electromagnetic valve 8 via a supply hose 10, and the electromagnetic valve 8 supplies compressed air from a compressed air supply tank (not shown) to the injection nozzle 4 at a predetermined timing. As a result, compressed air is injected from the injection port 4a toward the weft guide path S. A guide slope 4b connected to the jet nozzle 4a extends toward the outside of the weft guide passage S on the side closer to the weft detector 3 than the jet nozzle 4a. Injection port 4a along 4b
They are being guided to the side. A holder 5 is fastened to the upper frame 1a of the modified reed 1 so that its mounting position can be adjusted, and a substantially elliptical capture pipe 6 is fixed to the lower end of the holder 5. The capture pipe 6 is connected to the transvector 7 and the supply hose 11
The solenoid valve 8 supplies compressed air to the transvector 7 at the same timing as described above. As a result, a suction air flow is generated at the capture port 6a of the capture pipe 6. A slit forming pin 9 is provided on the holder 5 directly below the capture pipe 6 and protrudes toward the injection nozzle 4 side, and can be inserted between the reed blades facing the capture port 6a. Then, the slit forming pin 9 is inserted between the reed blades so that the injection port 4a and the capture port 6a face each other, and the injection port 4a and the capture port 6a face each other through the expanded slit.

Now, when the weft insertion is nearing completion, the electromagnetic valve 8 is opened, and compressed air is released from the injection port 4a to the capture port 6a.
At the same time, a suction air flow is generated at the capture port 6a. As a result, an air flow F is generated between the injection port 4a and the capture port 6a, which intersects with the weft guide path S and passes through the slit. The tip of the weft yarn Y that has reached the injection nozzle 4 is on the guide slope 4b
Due to the guiding action, the weft yarn is guided to the back side of the weft guide path S facing the injection port 4a. The leading end of the weft yarn Y thus guided is forcibly introduced into the trapping port 6a by the air flow F, and is captured in the trapping pipe 6.
The injection port 4a enters into the weft guide passage S and approaches the capture port 6a, and the weft transport fluid flow in the weft guide passage S flows along the guide slope 4b to the weft guide passage S corresponding to the injection port 4a. Since the weft Y is guided and converged toward the back side, the tip of the weft Y carried by the carrier fluid flow is reliably pushed into the trapping port 6a by the air flow F. The weft yarn Y bent and captured in the capture pipe 6 is given tension by the cooperation of the airflow F and the bending resistance, but the airflow F is sufficient due to the shortening of the distance between the injection port 4a and the capture port 6a. Becomes powerful.
This not only reduces compressed air consumption but also expands the selection range of weft tension, increasing the degree of freedom in tension selection depending on the type of weft.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, the injection port 4a
It is also possible to configure an auxiliary injection port to be set further outside of the weft yarn tip to assist the weft tip capturing action by the weft tip capture injection port 4a. Alternatively, as shown in FIG. 4, a groove-shaped guide slope 4c connected to the injection port 4a may be formed on the injection nozzle 4, an auxiliary injection port 4d may be provided in the middle of this guide slope 4c, or the guide slope may be connected to the injection nozzle. It is also possible to form it with a member different from the above. In addition, the transvector in the above embodiment may be omitted, a plurality of injection ports directed toward the capture port may be provided in the injection nozzle, or a shuttleless loom may be provided with a weft guide system using a weft guide member disposed in parallel facing the reed. The present invention can be applied to

Effects of the invention As detailed above, in the present invention, the injection port is inserted into the weft guide passage toward the rear of the machine, and the guide guide guides the weft tip between the injection port and the opposing catching port. Since the slope is provided extending from the vicinity of the injection port toward the outside of the weft guide passage on the weft insertion side,
By shortening the distance between the injection port and the capture port, the air flow generated between the two ports can be sufficiently increased, reducing compressed air consumption while reliably capturing the weft tip and applying appropriate tension. It has excellent effects.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment embodying the present invention. Figure 1 is a perspective view of the main parts, Figure 2 is a side sectional view, Figure 3 is a plan sectional view, and Figure 4 is a diagram of the present invention. FIG. 7 is a plan cross-sectional view showing another example. Injection nozzle...4, Injection port...4a, Guide slope...4b, Capture pipe...6, Capture port...6a,
Air flow...F, Weft guide passage...S, Weft...
Y.

Claims (1)

[Scope of utility model registration request] A spray nozzle is installed near the weft guide passage corresponding to the outside of the fabric edge on the non-weft insertion side, and the spray nozzle is inserted into the weft guide passage with the spray nozzle facing the rear of the machine. In a shuttleless loom, a guide slope for guiding the weft is provided extending outward from the weft insertion side weft guide passage from the vicinity of the injection nozzle, and a capture port for introducing the jet flow of the injection nozzle is set opposite to the injection nozzle. End tension applying device.