JPH0545702B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a weft insertion device in a fluid jet loom such as an air jet loom or a water jet loom. The present invention relates to a mixing or multi-color weft insertion device in a fluid jet loom that can introduce weft yarns.

[Conventional technology]

Conventional fluid jet looms include the following mixing or multicolor weft insertion devices.

JP-A No. 50-148663 and Japanese Utility Model Application No. 59-83989 disclose that a plurality of main nozzles are installed fixed to a fixed plate or sleigh with the relative positions kept constant.
A fixed type is disclosed in which the weft is inserted from a predetermined main nozzle based on a weft selection program.

In this fixed type, the main nozzle is not moved depending on the selection of the weft yarn, so from this point of view it is suitable for increasing speed. However, with this fixed type, the positional relationship between the main nozzle and the guide hole of the weft guide member or the weft guide hole of the reed having the weft guide section changes depending on which main nozzle inserts the weft. However, it is therefore difficult to maintain a stable weft insertion state at all times regardless of the selected weft position, and this poses a problem in that increasing the speed is restricted.

Japanese Utility Model Application Publication No. 59-169379 discloses that a plurality of main nozzles are integrally provided so as to be rotatable relative to the sley,
A movable type is disclosed in which a plurality of main nozzles are rotated based on a weft selection program and a predetermined main nozzle is selectively set at a weft insertion position.

With this movable type, the positional relationship between the main nozzle and the weft guide member or the guide hole of the reed having the weft guide section does not change, and therefore, a stable weft insertion state is always maintained regardless of which weft thread is selected. can. However, in this movable type, multiple main nozzles are rotated as a unit, so the mass of the movable part is large, and the inertia is large because the main nozzle, which has a large mass, can be moved. hard. Furthermore, even if it were possible to position the weft in the correct position, the position of the main nozzle would have to be changed in a short time according to the selected program, which would prevent a large proportion of the weft insertion time during one rotation of the crankshaft, which would be disadvantageous for increasing speed. It is.

Japanese Patent Publication No. 51-24609 discloses a weft insertion device for a fluid jet loom, which introduces a plurality of weft yarns into one main nozzle.

According to the device disclosed in Japanese Patent Publication No. 51-24609, the device disclosed in Japanese Patent Publication No. 50-148663 and
Unlike the fixed type disclosed in Publication No. 83989,
Since the weft is inserted through one main nozzle,
The positional relationship between the main nozzle and the weft guide member or the guide hole of the reed having the weft guide portion does not change, and therefore, a stable weft insertion state can be maintained at all times regardless of the selected weft position.

Furthermore, according to the device disclosed in Japanese Patent Publication No. 51-24609, the main nozzle is fixed compared to the movable type disclosed in Japanese Utility Model Publication No. 59-169379, etc., and the main nozzle problem is inertia. There is no problem with positioning the nozzle at the proper position, and there is no time constraint on replacing the main nozzle.

[Problem that the invention seeks to solve]

However, in the weft insertion device disclosed in Japanese Patent Publication No. 51-24609, since a plurality of weft yarns are passed through one main nozzle, the weft yarns become entangled with each other in the main nozzle, stably performing the weft insertion function. In addition, in order to pull back unselected weft yarns to the entrance side of the main nozzle in order to eliminate entanglement between weft yarns, it is necessary to increase the amount of pullback, and a large pullback takes time and increases speed. The problem is that it is not possible to respond to

Therefore, even though a plurality of weft yarns are passed through one main nozzle, the present invention can stably perform the weft insertion function by eliminating entanglement between the weft yarns in the main nozzle. There is no need to pull the weft yarn back to the entrance side of the main nozzle.
It is an object of the present invention to provide a mixing or multi-color weft inserting device for a fluid jet loom that can be operated at high speeds without any problems.

[Means for solving problems]

In the present invention, it is possible to introduce a plurality of weft yarns into one main nozzle, which is made up of a main nozzle body, an acceleration tube integrally formed with the main nozzle body, and a yarn guide tube fitted into the main nozzle body. In the weft inserting device for a fluid injection type loom, a yarn guide control rod extending in the axial direction is provided in the axial center of the yarn guide tube, and a high-speed flow of fluid is provided between the inner wall of the yarn guide tube and the yarn guide control rod. In addition to forming a flow velocity area,
The above object is achieved by a weft insertion device for a fluid injection type loom, characterized in that a yarn guide having eyes for guiding a plurality of weft yarns corresponding to the high flow velocity region is provided at the entrance of the yarn guide tube.

[Effect]

Generally, when jetting the weft yarn from the main nozzle, compressed air is jetted from the wall of the acceleration tube, and the air sucked by the compressed air flows in the axial direction from the yarn guiding tube inside the acceleration tube in a turbulent state. . The flow velocity is zero on the wall surface of the filament tube, and the flow velocity is highest at the shaft core. On the other hand, according to the inventor's observation,
It is recognized that the weft yarns carried by the weft insertion air flow tend to be located in the portions of the pipe where the flow velocity is high. Therefore, in conventional main nozzles, weft yarns tend to be conveyed through the high-flow velocity section of the yarn guide tube, that is, the axial core section. Therefore, when a plurality of weft yarns are introduced into one main nozzle, Since both weft yarns are located at the axis, they become entangled with each other.

In the main nozzle according to the present invention, the flow inside the filament tube has no or almost no flow component (rotational component) in a plane perpendicular to the axis. Moreover, in the present invention, a yarn guide control rod extending in the axial direction is provided at the core of the yarn guide tube of the main nozzle, and the flow velocity is zero on the wall surface of the yarn guide tube and the circumferential surface of the yarn guide control rod. An annular flow is formed between the yarn guide tube and the yarn guide control rod, and the highest flow velocity portion exists between the yarn guide tube and the yarn guide control rod. Therefore, the weft yarns introduced into the main nozzle at intervals around the control rod at the entrance of the yarn guide tube are conveyed axially in the highest flow velocity section around the control rod, and are not tangled, and the weft yarns are not tangled. There is no or almost no need to pull back the weft yarn that is not inserted.

Furthermore, in the present invention, the main nozzle does not move when selecting weft yarns as in the fixed type, and the weft yarns can be sorted in a short time according to the selection program, making it suitable for increasing the speed of the loom.

Any suitable method can be used to introduce the weft yarns at intervals around the control rod at the entrance of the yarn guide tube, but one example is a yarn guide having a number of stitches corresponding to the number of weft yarns to be introduced into the main nozzle. may be provided at the entrance of the thread guide tube.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a sectional view of a first embodiment of the present invention.
The main nozzle 20 of this embodiment is fixedly installed on a sleigh (not shown) that swings in time with the crankshaft of the machine base, but the main nozzle of the present invention is fixedly installed on the machine base. Good too. Main nozzle 20
consists of a main nozzle body 1, an acceleration tube 2, and a yarn guide tube 3 whose central axes are aligned in a straight line.

That is, the acceleration tube 2 having a hollow hole communicating with the conical hole of the main nozzle body 1 is integrally formed at the tip of the main nozzle body 1 having a conical hole, or the acceleration tube 2 is screwed or fitted. worn and assembled in one piece.

A hollow fiber guide tube 3 having a truncated conical tip
However, an O-ring 4 is attached to the rear end of the main nozzle body 1.
It is fixed by screwing through. A yarn guide 5 having a number of openings 5a and 5b corresponding to the number of wefts to be introduced into the main nozzle 20 is fixed to the rear end of the yarn guide tube 3 by screwing, welding, gluing, or the like.

A yarn guide control rod 6 having a circular cross section is fixed to the center of the yarn guide 5 by screwing, welding, gluing, etc., and the outer circumference of the yarn guide control rod 6 is spaced apart from the inner circumferential surface of the yarn guide tube 3. and the yarn guide control rod 6 is connected to the yarn guide tube 3.
extends in the axial direction.

Air passage 1a is located on the wall of main nozzle body 1.
is bored, and the air supplied from the air passage 1a in synchronization with the crankshaft of the machine base fills the conical gap between the conical hole of the main nozzle body 1 and the conical tip of the thread pipe 3. The holes 5a, 5 of the yarn guide 5 provided at the entrance of the yarn guide tube 3 pass through the hole of the acceleration tube 2.
The weft yarns 7a and 7b supplied from b are sucked, jetted, and inserted into a shed formed between warp yarns (not shown).

With the above structure, in the main nozzle 20 according to the present invention, there is no flow component in the plane perpendicular to the axis in the flow inside the filament tube 3. Moreover, in the present invention, a yarn path control rod 6 extending in the axial direction is provided at the axial center of the yarn guide tube 3 of the main nozzle 20.
The flow velocity is zero on the wall surface of the yarn guide tube 3 and the circumferential surface of the yarn guide control rod 6, and an annular flow is formed between the yarn guide tube 3 and the yarn guide control rod 6. The highest flow velocity section exists between the road control rod 6 and the road control rod 6. Therefore,
The gripper is operated to open and close in synchronization with the crankshaft of the machine, and the yarn is introduced into the main nozzle 20 from the eyes 5a and 5b of the yarn guide 5 at the entrance of the yarn guide tube 3 at intervals around the control rod 6. weft 7a,
7b is conveyed axially around the control rod 6 at intervals in the highest flow velocity section without becoming entangled. Therefore, there is no or almost no need to pull back the weft yarns that are not inserted.

In the embodiment shown in FIG.
was fixed to the yarn guide 5, but as shown in FIG.
c, and insert the thread guide control rod 6, which is longer than the one in the embodiment shown in FIG.
(Fig. 3). With this configuration,
The length of the yarn path control rod 6 can be set to an optimum value depending on the weft count, material, weaving conditions, etc.

The cross-sectional shape of the yarn path control rod 6 of the present invention can be selected as appropriate, for example, it may have a circular cross-section as shown in FIGS. 1 and 2, and furthermore, as shown in FIGS. 4 and 5, It may be a polygonal cross section having a number of sides equal to the number of wefts introduced into the main nozzle, that is, a triangular cross section in FIG. 4 and a quadrangular cross section in FIG. 5. Figures 4 and 5
In the configuration as shown in the figure, a plurality of (three in FIG. 4, four in FIG. 5) high-speed basins A are formed separately around the yarn path control rod 6, as shown by two-dot chain lines. Separation of weft threads can be performed more reliably. Furthermore,
As shown in FIG. 6, a yarn path control rod 6 having a cross-shaped cross section or a star-shaped cross section may be used to separate the weft yarn paths.

〔Effect of the invention〕

According to the present invention, entanglement of weft yarns can be prevented by a simple structure in which a yarn path control rod is provided in the main nozzle. Since the main nozzle has only one accelerating tube, the positional relationship with the weft guide or reed will not shift regardless of the selected weft, and weft insertion can be performed reliably.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of an embodiment of the present invention, FIG. 2 is a cross-sectional side view of a part of another embodiment of the present invention, and FIG.
The figure is a view taken along the - arrow in FIG. 2, and FIGS. 4 to 6 are cross-sectional front views of yarn path control rods of other embodiments, respectively. DESCRIPTION OF SYMBOLS 1...Main nozzle body, 1a...Air passage, 2...Acceleration tube, 3...Yam guide tube, 5...Yam guide, 6...Yam path control rod, 7a, 7b...Weft, 20... main nozzle.

Claims (1)

[Claims] 1. Fluid injection that allows a plurality of weft yarns to be introduced into one main nozzle, which is composed of a main nozzle body, an acceleration tube integrally formed with the main nozzle body, and a yarn guiding tube fitted into the main nozzle body. In the weft insertion device of a type loom, a yarn guide control rod extending in the axial direction is provided in the shaft core of the yarn guide tube to form a high-speed flow velocity region of fluid between the inner wall of the yarn guide tube and the yarn guide control rod. A weft insertion device for a fluid injection type loom, characterized in that a yarn guide having eyes for guiding a plurality of weft yarns corresponding to the high flow velocity region is provided at the entrance of the yarn guide tube.