JPH049219B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a weft inserting device for an air-injection type loom, and more specifically, a large number of weft guides are arranged on a sled in parallel in the weft inserting direction, and these weft threads are A guide passage for guiding the weft insertion air and the weft yarn is formed by a row of guide holes formed in the guide element, and an auxiliary nozzle is appropriately arranged on the weft exit side of the guide passage, and auxiliary air is supplied from the auxiliary nozzle. This invention relates to a weft inserting device for an air jet loom, which is configured to emit air toward the side opposite to the weft escape side in a guide passage.

2. Description of the Related Art Various types of weft insertion devices have been proposed in the past. For example, as a first conventional device, as shown in Japanese Patent Publication No. 57-27218, a guide passage is formed by a rectangular guide hole,
Auxiliary air is injected obliquely upward from the auxiliary nozzle to the weft escape side, and when the auxiliary airflow is reflected by the inner wall surface of the guide hole, the swirling component of the auxiliary airflow is attenuated by the corners of the inner wall surface. However, as shown in Japanese Patent Publication No. 59-27411, a second conventional device is one in which at least one of the thickness and width of the weft guide, which constitutes the deepest position of the guide hole, is made smaller than the other parts. By injecting auxiliary air from the auxiliary nozzle toward a deep position in the guide hole and actively leaking the auxiliary air from between the weft guides, the swirling component of the auxiliary air flow is reduced, and the auxiliary air flow is The third conventional device is one that focuses the air in a deep part, as shown in Japanese Patent Publication No. 59-30821, in which the wall surfaces of the weft exit side and the opposite weft exit side of the guide hole are perpendicular to the auxiliary air flow. The reflective airflow is formed in a straight shape to serve as a reflective surface, and the reflected airflow of the auxiliary airflow is directed toward the vicinity of the next auxiliary nozzle, so that the conveyance effect by the next auxiliary nozzle is enhanced by the reflected airflow. A fourth conventional device, as shown in Japanese Unexamined Patent Publication No. 58-8158, has a trapezoidal shape in which the wall surface of the guide hole on the side opposite to the weft escape side is made straight, and the guide hole expands toward the wall surface. The fifth conventional device is one in which the reflected air flow of the auxiliary air flow that is formed and injected from the auxiliary nozzle is contracted to ensure the flow force, and the center of the flow is moved away from the weft escape gap. As shown in Japanese Patent Application Laid-Open No. 58-70746, by making the center line of the auxiliary air flow from the auxiliary nozzle obliquely intersect with the inner wall of the guide hole, a swirling flow in a predetermined direction is generated, and the weft escapes. There are known devices that prevent the weft from escaping from the weft gap.

Problems to be Solved by the Invention In the first conventional device described above, the swirling component of the auxiliary airflow cannot be completely suppressed at the corners, and as a result, a swirling flow toward the weft exit gap is generated. The weft yarn gets caught in the weft escape gap, which tends to cause poor weft insertion, and in order to prevent the weft escape, the opening area of the guide hole needs to be enlarged, resulting in a large amount of air consumption. . In the second conventional device, since the auxiliary air is actively leaked from between the weft guides, there is a problem that the weft conveying effect by the auxiliary air flow is reduced and the amount of air consumed is increased. In the case of the third conventional device, the main stream of the reflected air stream of the auxiliary air stream is directed toward the weft escape gap, which tends to cause running troubles such as the weft getting caught in the weft escape gap. There was a problem that air leakage caused the weft conveyance efficiency to decrease and the amount of air to be consumed to increase. In the fourth conventional device, the mainstream of the reflected airflow tends to generate a swirling airflow in one direction in the guide passage, and as a result, due to the viscoelastic behavior of the weft, the weft is forced into the auxiliary airflow from the auxiliary nozzle. If it deviates from the mainstream, it tends to face the gap for weft escape, which tends to cause running troubles, and air leakage when the mainstream is reflected reduces weft conveyance efficiency, resulting in a problem of increased air consumption. In the fifth conventional device, the air and the weft easily escape from between the weft guides and the weft escape gap due to the swirling of the air and the weft, making the running of the weft unstable and reducing air consumption. There were many problems.

Therefore, the present invention eliminates the problems of the conventional device described above, and
It is an object of the present invention to provide a weft inserting device for an air injection loom that can stabilize the running of weft threads and reduce the amount of air consumed for inserting the weft.

Means for Solving the Problems According to the configuration of the present invention, in a weft inserting device for an air-injection type loom, an auxiliary air flow from an auxiliary nozzle and an injection hole is provided on the wall surface of the guide hole on the side opposite to the weft exit of the weft guide. The present invention is characterized in that a flow dividing recess is provided at a position that vertically divides the flow into two parts, projecting toward the auxiliary nozzle side, and a flow dividing recess is provided on the upper and lower sides of the flow dividing recess, respectively.

Function To explain the function of the present invention, when auxiliary air is jetted obliquely to the weft insertion direction from the auxiliary nozzle during weft insertion, the main stream of the auxiliary air flow is formed on the wall surface of the guide hole in the weft guide. It comes into contact with the flow dividing convex portion, is guided to the upper and lower flow dividing recesses, is divided into upper and lower portions, and is spread, and furthermore, is immediately rectified in the weft insertion direction while being turned by these flow dividing recesses. In addition, among the swirling airflow caused by the dividing recess, the flow toward the weft escape gap is blocked by the auxiliary airflow from the next auxiliary nozzle, so that the auxiliary airflow injected from the auxiliary nozzle flows into the weft guide path. An air region in the weft insertion direction that is effective for weft flight is formed in a relatively wide area away from the weft escape gap. Therefore, the weft yarn is stably run by the air flow in the weft insertion direction within the guide passage.

Embodiment FIGS. 1 and 2 show a weft inserting device for an air-injection loom, in which numeral 1 indicates a slew that is oscillated by a slew saw blade (not shown), and 2 a slew 1.
The reed 3 attached to the upper surface is a main nozzle for weft insertion also attached to the upper surface of one end of the sleigh 1, and as is well known, it is configured to spray the weft yarn 30 toward the other end of the sleigh 1. has been done. Reference numeral 4 denotes a mounting bar in the shape of an oblong regular square prism that is integrally attached to the upper surface of the sleigh 1 on the weaving side of the reed 2. A mounting groove 4a is formed in the longitudinal direction on the upper surface of the mounting bar 4, and an air passage 5 is formed in the longitudinal direction. A plurality of passages 6 communicating with the air passage 5 are formed at required intervals on the upper surface. Reference numeral 7 denotes a thin plate-shaped weft guide whose base end is inserted into the mounting groove 4a of the mounting bar 4 and fixed with adhesive, and is used to locate the auxiliary nozzle (the position of the passage 6), which will be described later. A large number of them are arranged in equal pitches in the positions other than the above. Note that a weft guide with a portion removed may be provided in a portion corresponding to the auxiliary nozzle. A substantially rectangular guide hole 8 is formed in each of the weft guides 7, and the guide hole 8
A weft escape gap 9 is formed diagonally upward at the upper corner of the reed 2 side. As shown in FIG. 3, on the wall surface 8a of the guide hole 8 on the side opposite to the weft exit (fabric front side), the auxiliary air flow from the injection hole 17 is arranged at the same height as the injection hole 17 of the auxiliary nozzle 16, which will be described later. A diversion concave portion 10 that extends toward the auxiliary nozzle side (weft exit side) is formed at the upper and lower intermediate position dividing into two, and an injection hole 17 and a diversion convex portion 1 are provided on both upper and lower sides of the diversion convex portion 10.
The branching recess 11 is symmetrical with respect to the line connecting the tops of the
12 are formed. The surface of the diversion convex portion 10 is constituted by a convex curved surface 10a formed by projecting the upper and lower middle portions of the wall surface 8a into a substantially arc shape, and the diversion convex portion 1
The inner surfaces of 1 and 12 are concave curved surfaces 11a and 12a recessed into approximately circular arcs so as to be continuous with the convex curved surface 10a and the upper and lower wall surfaces 8b and 8c of guide hole 8, respectively.
It is structured by. In addition, in the upper and lower wall surfaces 8b and 8c on the side portions of the flow dividing recesses 11 and 12,
Projections 13 and 14 are formed in continuation of the concave curved surfaces 11a and 12a and slightly protrude inward, respectively, and as a result, the diversion recesses 11 and 12 have projecting portions 1
It is formed so as to enter above and below 3 and 14. The surfaces of the projecting portions 13 and 14 are formed into gently convex curved surfaces 13a and 14a. The upper and lower wall surfaces 8b and 8c are formed such that the distance between them gradually increases toward the weft escape side.

As shown in FIG. 4, the guide holes 8 of each weft guide 7 are arranged in a row to form a guide passage 15 for guiding the weft insertion air and the weft 3.

Next, reference numeral 16 denotes an auxiliary nozzle inserted into the passage 6 of the mounting bar 4, with a part near the upper end facing the guide passage 15. A spray hole 17 is formed on the circumferential surface of the auxiliary nozzle 16 at a height opposite to the approximate center of the guide passage 15, and is oriented obliquely to the weft insertion direction (direction of arrow A in FIG. 4). . Although the injection hole 17 is composed of one circular hole, it may be composed of a plurality of holes. As shown in FIG. 3, a plurality of the auxiliary nozzles 16 are arranged at required intervals. These auxiliary nozzles 16 are located downstream of the position where the main flow of the auxiliary air flow injected from the auxiliary nozzle 16 one upstream reaches the wall surface 8a of the guide hole 8 on the side opposite to the weft exit side. It should be noted that compressed air is supplied to each of the auxiliary nozzles 6 at a predetermined timing by an air supply device (not shown) each time compressed air is injected from the main nozzle 3, and the air is supplied from the injection hole 17 to the upper and lower intermediate portions of the wall surface 8a. Auxiliary air is now injected towards the

In the weft insertion device having the above configuration, when compressed air is injected from the main nozzle 3, the weft yarn 30 in the main nozzle 3 is inserted into the guide passage 15 by the airflow from the main nozzle 3. , transported in the weft insertion direction. Further, when compressed air is injected from the main nozzle 3, auxiliary air is injected from the injection holes 17 of each auxiliary nozzle 16 at a predetermined timing. As shown in FIGS. 3 and 4, the main stream of the auxiliary air flow from these injection holes 17 is injected obliquely to the weft insertion direction toward the upper and lower intermediate portions of the wall surface 8a on the opposite weft escape side of the guide hole 8. be done. The main stream (center) of the auxiliary air flow has a high flow velocity, and the flow velocity decreases toward the peripheral surface. The main stream of the auxiliary air flow comes into contact with the wall surface 8a of the guide hole 8 on the anti-thread entry/exit side, and is formed by the diversion convex portion 10 of this wall surface 8a into upper and lower diversion concave portions 11 and 12 as shown in FIG. The main stream is actively and evenly divided and diffused in the direction, and by the upward and downward diffusion of the main stream, the main stream is guided into the dividing recesses 11 and 12 and rectified in the weft insertion direction, and these dividing recesses 11 .
An effective flow velocity region where the flow velocity in the weft insertion direction is high is formed in a wide range on the opposite weft exit side of No. 5. A part of the airflow swirled by the upper and lower flow dividing recesses 11 and 12 as described above tries to head toward the weft exit side, but these airflows are assisted by the next auxiliary nozzle 16. It is combined with a part of the airflow and rectified in the weft insertion direction, and can suppress the flow toward the weft exit side. Further, in the above case, in this embodiment, the guide hole 8
Projections 13 and 14 are formed on the upper and lower wall surfaces 8b and 8c, and the air flow swirled by the flow dividing recesses 11 and 12 is directed to the guide passage 1 by the projections 13 and 14.
5, the swirling airflow is further rectified in the direction of weft insertion.
Furthermore, these air flows are combined near the center of the guide passage 15 and rectified in the weft insertion direction, creating an effective flow velocity region over a wide range within the guide passage 15. Therefore, the weft yarn 30 injected into the guide passage 15 from the main nozzle 3 runs stably in a wide flow velocity region in the weft insertion direction within the guide passage 15.
In addition, as mentioned above, since the air flow toward the weft escape side is almost completely eliminated, accidents such as the flying weft 30 escaping from the weft escape gap 9 or getting caught in the weft escape gap 9 are avoided. Prevented.

Next, in the case of the weft insertion device as described above, the auxiliary air flow injected from the auxiliary nozzle 16 is actively diffused and quickly rectified in the weft insertion direction as described above. can be effectively used for weft flying, thereby significantly reducing the amount of air consumed for weft insertion. Furthermore, as described above, it is possible to create an effective wide flow velocity region in the opposite side of the weft escape side in the guide passage 15, so that the area of the guide hole 8 of the weft guide 7, that is, the cross-sectional area of the guide passage 15, can be significantly reduced. As a result, the amount of air consumed for weft insertion can be reduced, and the weft guide 7 can be downsized.
Furthermore, as described above, a wide flow velocity region can be created by active diffusion of the high-speed flow component of the auxiliary air flow, so even if the injection hole 17 of the auxiliary nozzle 16 is made into a single circular hole, a wide flow velocity region can be created. The injection hole 17 can be easily fabricated.

FIG. 5 shows a different embodiment of the weft guide according to the present invention, in which the diverting convex portion 10e of the guide hole 8e of the weft guide 7e is constituted by a triangular protrusion, and the diverting concave portion 1
The inner surfaces of 1e and 12e are formed into polygonal surfaces.

Effects of the Invention As described above, in the present invention, when inserting the weft, the auxiliary air flow injected from the auxiliary nozzle is guided to the upper and lower divider recesses by the diversion convex portion, and the auxiliary air flow is produced at high speed. Since the flow components are actively diffused and quickly rectified in the weft insertion direction, a wide range of effective flow velocity can be created within the weft guide path, allowing the weft to run efficiently and stably. can. In addition, the auxiliary air flow can be effectively used for weft flying, thereby significantly reducing the amount of air consumed for weft insertion. Furthermore, as mentioned above, since the auxiliary air flow is diffused and rectified in the weft insertion direction, the opening area of the guide hole of the weft guide can be reduced, and the nozzle hole of the auxiliary nozzle can be reduced to one small diameter circular hole. Even in such cases, it is possible to create an effective rectified flow velocity in the guide passage and perform stable weft insertion.As a result, the cross-sectional area of the guide passage for the weft can be reduced, which also improves weft insertion. This has the effect of reducing the required air consumption and reducing the processing cost of the auxiliary nozzle.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view, FIG. 2 is a vertical sectional view, and FIG. 3 is an enlarged view of main parts.
FIG. 4 is a cross-sectional view, and FIG. 5 is a partial view showing a different embodiment. DESCRIPTION OF SYMBOLS 1... Slay, 7... Weft guide, 8... Guide hole, 10... Diversion convex part, 11, 12... Diversion concave part, 15... Guide passage, 16... Auxiliary nozzle.

Claims (1)

[Scope of Claims] 1. A guide passage in which a large number of weft guides are arranged in parallel in the weft insertion direction on a sled, and the weft insertion air and weft are guided by rows of guide holes formed in these weft guides. An air injection type in which an auxiliary nozzle is appropriately arranged on the weft exit side of the guide passage, and auxiliary air is jetted from the injection hole of the auxiliary nozzle toward the weft exit side in the guide passage. In the weft inserting device of a loom, a diversion convex portion is provided on the wall surface of the guide hole on the side opposite to the weft exit side at a position that divides the auxiliary air flow from the injection hole into upper and lower halves, projecting toward the auxiliary nozzle side. A weft inserting device for an air injection loom, characterized in that a diversion concave portion is symmetrically provided above and below the convex portion to rectify the air flow divided by the diversion convex portion in the weft insertion direction. 2. The air jet according to claim 1, characterized in that the inner surface of the branching recess is formed into a substantially arc-shaped concave curved surface, and the auxiliary air flow from the auxiliary nozzle is swirled by the branching recess. Weft inserting device for type looms. 3. The air injection type according to claim 1 or 2, wherein the upper and lower flow dividing recesses are formed so as to enter above and below the upper and lower wall surfaces of the guide hole, respectively. A weft insertion device for a loom.