JPS5926688B2 - Weft inserting device in jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jet loom weft insertion device that includes a number of guide pieces on a slay to form guide passages for guiding fluid and weft yarns, and performs weft insertion using an auxiliary fluid. It is.

Conventionally, in order to guide the fluid and the weft yarn on the slay, a large number of guide pieces were arranged in parallel, and the guide surface was configured to be approximately cylindrical in order to form a approximately cylindrical passage in the weft insertion direction. It is known that a weft yarn is run through the space of the cylindrical passage by installing a guide piece in which the fluid injected from the main nozzle passes through approximately the center of the cylindrical passage. The weft insertion method runs the weft yarn near the center of the cylindrical passageway, which has the disadvantage of causing instability such as the weft yarn jumping out of the passageway, and this type of weft insertion device is not covered by the present invention. It's not something you do.

The subject of the present invention is a weft inserting method on a slay in which the weft is guided by an auxiliary fluid along the guide wall of a large number of guide pieces arranged in parallel in the weft insertion direction to form a guide passage for the fluid and the weft. limited to.

This type of weft insertion device is equipped with an auxiliary fluid injection unit such as an auxiliary nozzle, so it is possible to perform stable weft insertion regardless of the fabric width. Since the weft is inserted along the weft, the weft can be inserted in an extremely stable state, and the best weft insertion conditions can be obtained by adjusting the pressure of the auxiliary fluid and adjusting the injection direction. It also has great advantages in terms of operability for weft insertion adjustment.

However, this stable weft insertion is achieved when weft insertion is performed at a relatively low speed, but when trying to increase the weft insertion speed, the flying speed of the weft thread does not increase even if the fluid speed is increased. Not only that, but the stability of weft insertion was also hindered.

As a result of various studies on the factors that impede weft insertion speed and weft insertion stability, we found that the most important factor is that the weft thread is moved along the guide wall of the guide piece using an auxiliary fluid to stabilize the flying state of the weft thread. It turns out that there is a point in doing the insertion.

That is, as shown in FIG. 7, for example, the auxiliary fluid is directed toward the guide wall and a portion of the auxiliary fluid is actively leaked from between the guide pieces to the back side, thereby pressing the weft yarn along the guide wall. Since the weft insertion is carried out while maintaining the weft insertion state, the function of providing stability to the weft insertion is extremely strong, but on the other hand, leakage of the auxiliary fluid that performs the function of stabilizing the weft threads causes the weft threads to fly. The efficiency of using the fluid necessary for this decreases, and the function of increasing the flying speed of the weft threads is greatly hindered.

As a result, no matter how much the flow velocity is increased, the weft insertion speed does not increase, and on the contrary, the stability of the weft insertion is hindered, which is a paradoxical phenomenon.

The present invention improves the structure of the auxiliary nozzle and the guide piece in a jet loom that uses an auxiliary fluid to insert the weft thread into the guide passage along the guide wall of the guide piece, thereby improving the structure of the conventional device described above. This eliminates the drawbacks and makes it possible to achieve higher weft insertion speed while maintaining the stability of weft insertion.

Hereinafter, the content of the present invention will be explained in detail based on the drawings.

Figures 1 and 2 schematically show an embodiment of a loom to which the present invention is applied, in which 1 is fixed to a slace ward 2 which reciprocates in the direction of the arrow by a drive mechanism (not shown). It's Sorey.

A reed 3, a guide piece 4, and an auxiliary nozzle 5 are arranged on the sleigh 1.

As clearly shown in FIG. 2, a large number of guide pieces 4 are arranged in parallel in the weft insertion direction, and a guide passage for fluid and weft is formed by guide walls 6 that are semi-open on the reed side.

Further, the auxiliary nozzles 5 are vertically installed at predetermined intervals so as to face the guide wall 6 of the guide piece 4 in the front-rear direction of the loom, and their fluid jet lowers open in the weft insertion direction and toward the guide wall 6. As is clear from FIG. 6, the central axis thereof intersects with the guide wall 6.

Therefore, the weft Y of the cheese 8 fixedly provided on the side of the machine is let out by the measuring rollers 9 and 10, temporarily stored in the storage device 11, passed through the braking device 12, and delivered to the main nozzle 13. reach

At the same time as the fluid is jetted from the main nozzle 13, the weft yarn Y
The same weft yarn Y is kept flying along the guide wall 6 by the auxiliary fluid from the auxiliary nozzle 5 in the guide path formed by the guide piece 4, and is inserted into the weft.

When weft insertion is completed, sley 1 is rotated in the direction of the arrow,
As shown by the imaginary lines in FIG. 1, the guide piece 4 and the auxiliary nozzle 5 separate from the warp W, pass through the opening of the weft guide piece 4, and leave the guide passage, and the reed is beaten by the reed 3, and the woven fabric 14 is formed.

Note that 15 is a temple device.

FIGS. 3 to 5 show a guide piece 4 constructed according to the present invention, and one embodiment of the guide piece 4 has a half-opened upper part;
The inner wall surface of the opening forms a guide wall 6.

The guide wall 6 has an upper surface, a lower surface, and a vertical surface all formed as inclined surfaces that reduce in the weft insertion direction.

Note that the lower surface of the guide wall 6 is also inclined downward, but this is configured so that the guide piece 4 does not catch the warp when it enters the warp opening.

Next, the effects of the present invention will be explained.

Fig. 6 (present invention) and Fig. 7 (conventional device) show the guide wall 6.
, 6' are different in that they are formed on inclined surfaces that reduce in the weft insertion direction and are formed on flat surfaces parallel to the weft insertion direction, and all other conditions are the same.

Regarding the conventional device shown in FIG. 7, the auxiliary fluid injected from the auxiliary nozzle 5 is radially diffused in a conical direction from the opening 7, and the streamline at the highest flow velocity position is indicated by a.

Therefore, as the distance from a increases, the flow velocity becomes a streamline at a lower position (this point is also the same in the case of FIG. 6).

The streamline a collides with the guide wall 6fr) of the guide piece 4' at the mouth position on the weft insertion side and is reflected at a predetermined angle in the weft insertion direction.

The flow line collides with the opposite end of the guide wall 6' of the guide piece 4' at the streamline slot opening and flows in the weft insertion direction.

The streamline e does not collide with the guide piece 4' at the opening (flows in the weft insertion direction).

However, since the streamline d passes through the end of the guide wall 6' on the opposite side of the weft insertion side and collides with the side surface of the guide piece 4' at the opening, all of it leaks behind the guide piece 4'. Become.

Therefore, all the fluid in the range A' where a = d becomes leakage fluid and flows behind the guide piece 4', and is not effective for flying the weft yarn.

Moreover, in the case of the conventional device, the fluid in the range A' is the fluid near position a where the flow velocity is highest, and most of this becomes leakage fluid, so the efficiency of fluid utilization for increasing the weft insertion speed is extremely poor. It is something.

However, much of the leaked fluid in this conventional device functions to maintain the flying weft yarn on the guide wall 6' side, and as a result, the stability of weft insertion can be improved.

However, since the leaked fluid pushes the weft yarn toward the guide wall 6' more than necessary, increasing the chance of contact with the guide wall 6',
The contact resistance of the weft yarns increases, and this acts synergistically with the aforementioned decrease in fluid utilization efficiency, which can become a factor that inhibits an increase in the weft insertion speed.

In the present invention shown in FIG. 6, the guide wall 6 is formed into an inclined surface that reduces in the weft insertion direction.

Streamlines a, b, and e flow in the weft insertion direction as in the conventional case.

However, the streamline a collides with the center side of the guide wall 6 at the mouth, and the weft-insertion side end of the guide wall 6 at the mouth position is exposed to the flow near the position of the streamline a where the flow velocity is relatively high. Line C collides and flows in the weft insertion direction.

Therefore, the leakage fluid area A at the streamline c=d is extremely reduced, and especially the fluid near the position where the flow velocity is high required to increase the weft insertion speed, that is, the fluid near the streamline a, all flows in the weft insertion direction. Therefore, the fluid usage efficiency for increasing the weft flying speed by the auxiliary fluid becomes extremely high, and as a result, it is possible to further increase the weft insertion speed.

Furthermore, due to the reduction in leakage fluid, the force pressing the weft yarn against the guide wall 6 becomes weaker, so the contact resistance of the weft yarn decreases, which also contributes to higher speed.

Although the figure shows the reduction in the leakage fluid area A in a two-dimensional manner, in reality, as mentioned above, the auxiliary fluid diffuses three-dimensionally in the conical direction, so the reduction rate of the leakage fluid is extremely high. It is.

In addition, since the guide wall 6 of the present invention has an inclined surface that reduces in the weft insertion direction, the portion that protrudes toward the guide path prevents fluid leakage compared to when the guide wall 6' is flat as in the conventional device. Separation phenomena often occur, and the region where turbulent flow such as vortex flow occurs on one side of the guide becomes extremely wide.

As a result, in the turbulent flow region, the fluid becomes difficult to flow toward the back side of the guide piece 4, and the space other than this region through which leakage fluid can pass is extremely small, and the amount of leakage fluid is reduced.

That is, in the present invention, the influence of the fluid separation phenomenon acts synergistically with the reduction of the leakage fluid area, and it is possible to significantly reduce the leakage fluid compared to the conventional device.

In addition, the inclination angle of the guide wall in the present invention is preferably 5 to 30 degrees with respect to the weft insertion direction, and in this case, the injection angle of the injection lower of the auxiliary nozzle 5, that is, the central axis of the injection lower with respect to the weft insertion direction It is preferable that the guide wall 6 is set so as to intersect with the inclined guide wall 6 at an angle of 20 to 50 degrees.

In the case of the present invention, since the leakage fluid is extremely reduced, the weft insertion stability performance as in the past is reduced, and furthermore, the guide wall 6
Since is an inclined surface, the reflection angle of the fluid becomes large, and the weft yarn is pushed toward the opening side of the guide piece 4 by this reflected fluid, and as a result, it may be thought that the stable performance of weft insertion is greatly hindered. I don't know.

However, in the present invention, as shown in FIG. 6, the leakage fluid region A exists to some extent and the force pushing the weft toward the opening of the guide piece 4 is due to the reflected fluid at the streamline b-c position. This occurs because the reflection angle is large, but since there is an auxiliary fluid heading in the weft insertion direction at the position of the streamline e on the opening side of the reflection fluid, the flow of the reflection fluid is reduced by this auxiliary fluid. A phenomenon occurs in which the flow is obstructed and the overall flow is in the weft insertion direction.

Therefore, the force that pushes the weft yarn toward the opening side is reduced, and the force that propels the weft yarn in the weft insertion direction works strongly while maintaining the weft yarn on the guide wall 6 side, thereby achieving weft insertion stability comparable to that of conventional devices. It is something that can be used.

Note that the inclined surface of the guide wall 6 must be formed on the inner wall surface of the guide passage, which is the guide wall opposing the auxiliary nozzle 5.

Further, the guide passage for the fluid and the weft yarn may be formed by a so-called modified reed which is a partially deformed part of the reed 3, or on the side where the auxiliary nozzle 5 is disposed with respect to the guide piece 4 shown in the illustrated embodiment. The guide piece 4 may be configured with an arm extending vertically from the lower side of the opening of the guide piece 4 so as to cover the opening of the guide piece 4 while leaving an opening necessary for the inserted weft to pass through. .

Furthermore, the auxiliary nozzle 5 may be configured such that a cavity is provided in the vertical arm portion of the guide piece, and the auxiliary nozzle 5 is made to stand vertically within the cavity.

As described above, the present invention provides an auxiliary nozzle extending substantially vertically from the slay at a position facing the guide piece disposed on the slay in the front-rear direction of the loom, thereby forming a weft insertion guide path. Of the guide walls of the guide pieces to be used, an inclined surface that decreases in the weft insertion direction is formed on the guide wall on the side opposite to the auxiliary nozzle, and the auxiliary fluid is ejected so that the central axis of the injection port of the auxiliary fluid intersects with the front and rear inclined surfaces. By arranging the opening in the auxiliary nozzle and causing the auxiliary fluid injected from the auxiliary nozzle to collide with the inclined wall surface of the guide piece, it is possible to extremely increase the utilization efficiency of the auxiliary fluid for weft flying. I can do it,
The weft insertion speed can be increased while maintaining high stability of the weft insertion function.

In addition, by making the guide wall an inclined surface, it is possible to make the injection angle of the fluid from the auxiliary nozzle larger with respect to the weft insertion direction, and as a result, from the injection position of the auxiliary fluid to the guide wall surface, This makes it possible to further increase the weft insertion speed, and even with low injection pressure, it is possible to maintain a high weft insertion speed.

Furthermore, in the present invention, the fluid utilization efficiency can be increased, so the gap between each guide piece can be made larger to prevent the occurrence of warp entanglement, and as a result, the fabric density can be increased, and more complex fabrics can be fabricated. Can enable textile weaving.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing a loom embodying the present invention;
The figure is a schematic plan view, FIG. 3 is a side view showing the guide piece according to the present invention, FIG. 4 is a sectional view taken along line II in FIG.
The figure is a sectional view taken along the line ■-■ of FIG. 3, FIG. 6 is a schematic plan view showing a part of the function of the present invention, and FIG. 7 is a schematic plan view of a part showing the function of the conventional device. be. 1...slay, total...reed, 4...
・Guide piece, 5... Auxiliary nozzle, 6...
・Guide wall.

Claims (1)

[Claims] 1 Weft insertion is carried out by injecting auxiliary fluid from a plurality of auxiliary nozzles arranged at predetermined intervals in the weft insertion direction into the weft insertion guide passage formed by the guide walls of a large number of guide pieces arranged in parallel on the sled. In the jet loom for performing this, an auxiliary nozzle extending substantially vertically from the slay is disposed at a position facing the guide wall of the guide piece in the front-rear direction of the loom, and a auxiliary nozzle extending substantially vertically from the slay is provided on the guide wall opposite to the auxiliary nozzle. 1. A weft insertion device, characterized in that an inclined surface is formed that decreases in the weft insertion direction, and the injection port for the auxiliary fluid is arranged in the auxiliary nozzle so that the central axis of the injection port intersects the inclined surface.