JPS5851050B2 - Auxiliary nozzle in jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for inserting a weft yarn into a shed of a loom by means of a fluid flow passing through one weft insertion guide member in a jet loom, and particularly to an improvement in an auxiliary nozzle. It is something.

In a preferred embodiment of the present invention, air is used as both the primary and secondary weft insertion fluids.
specially designed.

In looms with large weft insertion widths, the airflow emitted from the main nozzle is insufficient to insert the weft threads over the entire width of the loom.

Therefore, a secondary fluid is ejected over the entire length of the weft insertion comb member provided at a predetermined position in order to maintain the speed of the weft yarn at the initial value given by the main nozzle or to increase the speed of this weft yarn. An active orifice or auxiliary nozzle is provided.

There are various designs of auxiliary nozzles for ejecting secondary fluid, and the most commonly used ones are:
An active orifice is provided in some of the weft inserting comb members to also function as an auxiliary nozzle.

(Hereinafter, a comb member provided with an orifice will be referred to as an active comb member, and a comb member without such an orifice will be referred to as an inactive comb member.

) Therefore, these weft inserting comb members include an active comb member, and the active comb member has a cavity connecting a fluid inlet opening and an outlet opening, through which the weft inserting medium fluid passes. do.

The time interval during which fluid flows through the active comb member into the weft insertion channel is related to the position of the weft yarn with respect to the length of such weft insertion channel.

The outlet opening is formed in the comb member at an angle with respect to the long axis of the weft insertion passage.

The limit value of this angle is determined by the distance between the active comb member in the weft insertion direction and the inactive comb member downstream thereof in the weft insertion direction, and also by the function of this active comb member, i.e. the secondary The effect of the fluid is thus limited.

The disadvantage of the above-mentioned type is that the angle β between the central axis of the jet fluid (secondary fluid) injected from the active comb member and the long axis of the weft insertion passage is small, and the upper part of the secondary fluid is impacting the wall of the inert comb member downstream of the member.

This results in a reduction in the efficiency of the jet fluid or secondary fluid ejected from each active comb member.

When the angle β is 600 or more, the weft yarn is displaced from a preferred position along the central axis of the weft insertion path.

If the angle between the straight line touching the outer edge of the active comb member and the central axis of the secondary fluid jetted from the orifice of the active comb member is 90° or more, the angle of the secondary fluid jetted from the active comb member The dispersion and displacement are greater away from the axis of the weft insertion passage than in parts of the jet that are closer to this axis.

The object of the invention is to eliminate or at least alleviate the aforementioned disadvantages.

The present invention relates to the configuration of an outlet opening for ejecting a secondary fluid such as a jet air stream in an auxiliary nozzle of a jet loom, such as an active comb member, and the object of the invention can be achieved by satisfying the following conditions. I can do it.

That is, among the generatrixes which are geometrical elements of the inner wall surface of the exit opening, the generatrix closest to the central axis of the weft insertion guide passage is the first generatrix, and the generatrix farthest from the central axis of the weft insertion guide passage is the second generatrix. The plane including the intersection point where the central axis of the exit opening intersects with the straight line connecting the outer end of the first generatrix line and the outer end of the second generatrix line and the central axis of the weft insertion guide passage is defined as a first plane τ, and the plane outside the first generatrix line end and second
If the plane including the straight line connecting the outer ends of the generatrix and the outlet opening is the second plane ρ, the first and second planes are 25° to 15°.
The object of the present invention can be achieved by satisfying at least the condition that the straight lines intersect within a range of 5° and the angle between this straight line and the central axis of the outlet opening is an acute angle.

A functional feature of the device of the invention is that a second air stream, such as a jet air stream, is injected from the outlet opening of an auxiliary nozzle, such as an active comb member.
without causing the fluid to impinge on the outer edge of the inert comb member immediately downstream;
The object is to selectively direct and concentrate the weft at a desired position along the weft insertion direction over the entire area of the passage in a direction perpendicular to the weft insertion direction.

According to the present invention, the secondary fluid jetted from the auxiliary nozzle such as the active comb member provided along the weft insertion path causes undesirable vibration of the weft yarn at a position where it acts on the weft yarn being inserted. I can't close it.

The auxiliary nozzle according to the present invention will be described below by taking as an example an active comb member (see FIG. 2) which is a preferred embodiment.

As shown in Fig. 2, one jet orifice is arranged to guide a secondary weft insertion jet air flow, which is a secondary fluid, downstream in the weft insertion direction along the weft insertion passage formed by the comb member. An inert comb member 7 is provided downstream of the active comb member 1 and at a predetermined distance therefrom.

The active comb member 1 has a cavity 2 and is supplied with pressurized air through an inlet opening (not shown) in the leg 5 of the comb member.

An outlet opening 3 is connected to this cavity 2, from which a pressurized secondary jet air stream is fed into the weft insertion channel so as to act directly on the weft threads 4.

The cavity 2 with which the outlet opening 3 communicates directly is cylindrical and its long axis forms an angle of 90 DEG to the long axis of the weft insertion channel, ie perpendicular to the plane of the paper in FIG.

Preferably, the generatrix 3a of the outlet opening 3 closest to the central axis 4 of the weft insertion guide path is in contact with the circumferential surface of the cavity 2.

A recess 6 is formed in the front face of the outlet opening of the active comb member 1, which recess 6 surrounds the outer orifice 3 as shown in FIG.

In this embodiment, the second plane ρ intersects the plane τ, which coincides with the plane of FIG. 2, along the straight line a.

In this embodiment, as shown in FIG. The central axis of the air flow intersects the longitudinal central axis 4 of the weft insertion path at an angle β, and this longitudinal central axis 4 coincides with the weft path.

As shown, the angle β forms a small acute angle.

Also, the central axis forms an angle α with the straight line a, and the angle α is always less than 900.

The size of the outlet opening 3 is such that the edge m of the secondary jet air flow furthest from the central axis of the weft insertion passage passes through the inactive comb member 7 located immediately downstream of the active comb member 1 at the maximum width of the weft insertion passage. The edge n of the secondary jet air stream which is always guided to a position within the diameter and which is closest to the central longitudinal axis 4 of the weft insertion passage through the inert comb member 7 is β'' with respect to this central longitudinal axis 4. The angle β″ is always set to be less than 60°.

With parameters like this.

A diffusion range of the secondary jet air stream injected from the outlet opening 3 is defined.

By limiting the range of action of the secondary jet flow in this way, the component force of the secondary jet flow acting in the direction of the central axis of the weft guide passage is much smaller than the component force acting in the direction perpendicular to it. This effectively compensates for the decrease in the weft conveying force of the main jet flow, and also minimizes the influence of the secondary jet flow acting in a direction deviating from the weft insertion direction.

In the embodiment shown, the passageway 1 of the active comb member 1, 1a
4 and the passage 15 of the inert comb member 7 are both flask-conical and tapered slightly in the downstream direction.

The large and small diameter ends of the passage 15 are the passage 1 of the active comb members 1 and 1a.
4, 14a is larger than the diameter of the large end portion.

The passages 14 and 15 are coaxial and form a weft insertion passage using a comb member.

In order to bring the jet of the secondary jet air stream into contact with the weft yarn 4 at a predetermined point in the longitudinal direction of the weft insertion path, a plane ρ intersects the plane τ along the straight line a.
are designed to form an angle of 25° to 155° with respect to the plane τ.

If the outer end of the circumferential second generating line of the outlet opening 3 is a point A1, and the outer end of the first generating line is a point B, a straight line a passes through points A and B.

This plane ρ is designed to intersect with the plane τ at an angle of 25° TIJ to 155° with the straight line a as the intersection line at point A.

Next, the functions of the device according to the invention already described will be explained.

A pressurized secondary jet air flow is supplied to the cavity 21 from an inlet opening (not shown), and the pressurized secondary jet air flow from the cavity 2 passes through the outlet opening 3 to the weft where the weft 4 is driven. It flows into the input passage.

The secondary jet air stream from an individual active comb element 1 or from a group of active comb elements merges with the flow of pressurized fluid from the main nozzle to carry the weft yarn in a substantially rectangular manner over the entire weft insertion path. transport.

The second auxiliary nozzle according to the present invention shown in FIGS.
In this embodiment, the active comb member 1 shown in FIGS. 1 and 2 is replaced by a hollow cylindrical body 10 having a cavity 11, with which the outlet opening is connected.

The straight line n in the plane τ serves as the generating line of the outlet opening 12 in the cavity 11.
The intersection of the planes τ and ρ is shown by a line 12a.

Other lines shown in Figures 3, 4 and 5. m, n, etc. are the same as those shown in FIGS. 1 and 2 for the first embodiment.

As already mentioned, and especially as shown in FIG. Flow into the passage.

The lowermost edge n of the secondary jet air stream collides with the lower edge of the weft insertion passage of the comb member 1a.

The lower part of this secondary jet airflow is deflected upward from the lower wall of the weft insertion passage of the comb member 1a, and exerts an upward force on the weft yarn t passing through this passage, and this force counteracts the weight of the weft yarn. This results in lifting the weft yarn and carrying it along the weft insertion path.

It goes without saying that various design changes can be made to the secondary pressure medium ejection device according to the present invention in accordance with the above-mentioned technical idea.

[Brief explanation of drawings]

FIG. 1 is a suggested front view of an active comb member with an outlet opening for emitting a secondary jet air stream; FIG. 2 is a line I-n of the active and inert comb members shown in FIG. 1; 3 shows a state in which active comb members that emit a secondary jet air flow in the downstream direction of weft insertion and inactive comb members that do not emit a secondary jet air flow are arranged alternately. FIG. 4 is a front view of another embodiment of the device according to the invention provided with a cylindrical body having an outlet opening upstream of FIG.
A sectional view of the second embodiment taken along IV, FIG. 5 is a perspective view showing the relationship between planes ρ and τ. In these figures, 1 is an active comb member, 2 is a cavity, 3 is an outlet opening, 4 is a weft, 6 is a recess, and 7 is an inactive comb member.

Claims (1)

[Scope of Claims] 1. A weft inserting member in which a plurality of comb members having weft inserting spaces are arranged in a line at predetermined intervals to form a weft inserting guide passage having a central axis in the longitudinal direction; In a jet loom having an auxiliary nozzle, which is a secondary fluid ejecting means, provided at a predetermined interval along the weft insertion guide path for injecting fluid to propel the weft yarn within the weft insertion guide path; The nozzle is provided upstream with respect to weft insertion in close proximity to some of the comb members, and includes a cavity having an inlet passage and a portion having a jet outlet opening, and the nozzle is configured to include a portion having a jet outlet opening, and the nozzle is provided upstream with respect to the weft insertion, close to one of the comb members, and includes a cavity having an inlet passage and a portion having a jet outlet opening, and the nozzle has a portion having a jet outlet opening. The outer end of the first generatrix which is closest to the central axis of the weft insertion guide passage among the generatrixes that are the main elements and which is preferably in contact with the inner wall surface of the cavity; a first plane τ that includes an intersection point where the central axis of the exit opening intersects a straight line connecting the outer end of the second generatrix that is farthest away from the outer end of the second generatrix; a first plane τ that includes the central axis of the weft insertion guide path; and the outer end of the first generatrix and a second plane ρ that includes a connecting straight line connecting the outer end of the second generatrix and in which the outlet opening is open, intersects along the connecting straight line, and this connecting straight line makes an acute angle with the central axis of the outlet opening, The 2000th plane ρ is the 1000th plane τ
An auxiliary nozzle for a jet loom, characterized in that the auxiliary nozzle forms an angle within a range of 25° to 155° with respect to the loom. 2. Among the conical generatrixes of the secondary fluid that is injected from the outlet opening and diffused conically in the injection direction, the generatrix closest to the weft insertion passage is located within the first plane τ and forms the weft insertion guide passage. Claim 1: I An auxiliary nozzle in a jet loom according to the present invention, characterized in that an angle (β″) formed with the central axis of the comb member is 600 or less. The active comb member provided with the structure is used as the secondary fluid ejecting means, and therefore, the other comb members are inert comb members that do not have a secondary fluid ejecting function. The active comb members each have an internal cavity having an inlet passage for the secondary fluid and an outlet opening for ejection, and the central axis of the outlet opening is located within the first plane τ for guiding the weft insertion. The auxiliary nozzle for a jet loom according to claim 1, wherein the auxiliary nozzle intersects the central axis of the passage at an angle (β) smaller than the angle (β″). 4. The auxiliary nozzle for a jet loom according to claim 1, wherein the jet outlet opening of the secondary fluid ejecting means is cylindrical. 5. The secondary fluid ejecting means includes a plurality of comb member groups, one of which is provided at a position upstream of a predetermined plurality of comb member groups forming a weft insertion guide passage and does not substantially intrude into the weft insertion guide passage. A hollow cylindrical body, each hollow cylindrical body having a cavity communicating with a compressed air supply source and an outlet opening for ejecting a secondary fluid, the intersection angle of the two planes ρ and τ, the plane ρ 2. The auxiliary nozzle for a jet loom according to claim 1, wherein the angles formed by the intersecting line of the plane τ and the central axis of the outlet opening each satisfy the condition set forth in claim 1.