JPS602752A - Apparatus for inserting two weft yarns into two shuttles of loom equipped with center jet insert apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a device for inserting weft threads into two sheds of a loom equipped with a central jet insertion device and performing weft thread switching based on a program.

PRIOR ART It is known to insert two weft yarns one by one into two different sheds, in which case the two sheds are arranged in side-by-side relationship and a weft insertion device, That is, the weft length measuring device and the weft insertion nozzle are arranged between the two sheds, forming a so-called central shed insertion device. One type of insertion device for carrying out weft switching is a device that repositions the weft insertion nozzle by mechanically rotating it by 1800 degrees in order to insert the weft into the shed according to a program. When this device is used in a high-speed loom, it is expensive and generates a lot of noise. With other insertion devices,
For each of the two weft yarns to be inserted, using two nozzles with outlets facing towards the two sheds, as disclosed for example in Teeco Soro Pakhya Inventor's Certificate PV4451-80, Each nozzle receives at least two pressurized air supplies which can be opened alternately according to a program. This pressurized air supply acts only in the weft thread insertion direction due to the kinetic energy of the air flow, so that just when the weft thread insertion direction is switched from one shed to the opposite shed, the The pressurized air supply cannot actively act on the weft threads. During weft thread switching, which is thus carried out by changing the direction of movement of the weft threads, such a low pressurized air flow can only be used to create a release effect acting with very weak forces on the weft threads. do not have. For this reason, these devices are unreliable, especially for high speed looms and for heavy yarns.

〈Means for solving problems〉 The aforementioned drawbacks are overcome by the device of the invention.

A feature of the device of the invention is that, between the two outlet ducts of the inlet duct and the nozzle suitably communicating with the inlet duct, a plurality of air points are provided for changing the direction of travel of both the weft yarn and the incoming air flow; It has inclined nozzles that can be opened alternately,
The exit direction of the oblique air shed streams from the oblique nozzles is oriented crosswise to the opposite outlet nozzles.

For said plurality of air points for changing the direction of travel of the yarn stem having a plurality of inclined nozzles, the exit directions of the inclined jet streams of the plurality of inclined nozzles are directed crosswise to opposite outlet ducts. The effect of the device of the invention is that the oblique nozzle deflects both the weft thread and the incoming air stream by tilting it, so that the incoming air stream enters the air point under positive dynamic forces. Obtained based on facts.

Since this positive dynamic force directly depends on the kinetic energy of the inclined nozzle flow, this dynamic force can obtain high values, and the reliability of changing the insertion of the weft into the respective shed is certain, so that weft yarns with a wide range of counts can be operated on high speed looms.

<Example> Other advantages and features of the present invention will become clear from the following description with reference to the accompanying drawings.

A plurality of warp threads 25 controlled by a heddle frame 26
forms a warp shed 28 together with the reed 27, and this warp shed 2
8 is arranged in opposing relation to a warp shed 128 formed by a plurality of other warps 125 and a reed 127. In each warp shed 28°128 there are further wefts 2,10
Channel member 29, 129 having two running splits
is inserted, the weft 2, 102 is connected to the channel member 2.
9.129 and passes through a warp shed of 28.12g. The cleft channel 29.129 is formed, for example, by a plurality of tooth rows 31 made up of a liquid 30 of the reed 27 or a confeed 32.

At the insertion position of the inserted weft thread, a cutting device for the inserted weft thread, for example a cutter 33, 133, is shown schematically, respectively. Each weft thread 2, 102 is associated with a nozzle 1, 101 having an outlet directed towards the two warp sheds 28.degree. 128. Each nozzle 1, 101 includes an inlet air nozzle 3, 103, respectively, each of which is provided with an inlet air nozzle 5 at one end thereof and an opposite outlet nozzle 11, 12, respectively, at its other end. , and 111°112
It communicates with the air point via the air point, that is, the air action point 6,106.

Each air point 6,106 is connected to a pair of inclined nozzles 7.8
and 107, 108, the respective outflow directions 9, 10 of the slanted air jet stream 13.14 of the slanted nozzle 7.8 intersect with each other to form two opposite outlets 11.12 and 107, 108. They are facing 111 and 112 respectively.

On each outlet side, two mutually adjacent ducts 11.111 and 12, 112 of each of the two nozzles 1° 101 each have a common orifice 15.1.
6, each orifice 15.16 being surrounded by a second nozzle 17.18, which is itself provided with an air supply.

The inclined nozzles 7.8 and 107, 108 can each be opened alternately by a controlled air closure 37, and the two inclined nozzles 7 of nozzle 1.101
．． 108 and 8,107 respectively always exit 35.3
6, respectively.

A controlled air closure 37, such as a valve or slide valve, is coupled to the compressor 38 and programming device 34. The program 39 of the program device 34 may be recorded, for example on a magnetic tape, and read out electrically so that the controlled air closure is activated by an electromagnet, or the program 39 may be stored in a mechanical manner, for example on a lug and controlled. The transmitted air to the air closure 37 can be carried out by mechanical methods or other different combinations.

For example, FIG. 6 shows a mechanical method of storing a program 39 on a lug, in which a program device 34 forming part of a dobby device is transferred to a respective heald frame 26 by means of transmission not shown in FIG. Also used for .126 program control. The air supply from the compressor 38 to the main shaft 40 of the loom drive, the respective reeds 27, 127 and the programming device via a mechanism not shown in FIG. From the main shaft 40, the program device 34, in this case the drive means 43 for the dobby device, is activated, which in this case starts the controlled air closure 37, valve 44, 45 according to the program.

The respective weft yarn 2,102 is prepared for insertion with a length measuring device, which is not shown in the drawings herein, and is fed via the inlet duct 3 with the inlet air stream 4 to the air point 6.106.

At each air point 6.106, a respective pair of inclined nozzles 7.8 and 107, 108 are opened alternately so that the outflow direction 9.10 of the inclined air noet stream 13°14
11,
12, and 111°112. The inclined air jet stream 13 is deflected by tilting the weft yarn 2, 102 into the corresponding opposite duct 11 by a positive dynamic force, through which the inclined air jet stream 13 shuttles the weft yarn. Insert into port 128. The weft is in the shed 28
When it is to be inserted into the nozzle 12, an oblique air jet stream, not shown here, is discharged from the oblique nozzle 8 into the opposite nozzle 12. Each channel 29s1 with a split
After completing the flight through 29, the weft threads 2, 102 are each beaten by a corresponding reed, and at the beating position the weft threads are cut by the respective cutters 33, 133. In order to increase the effect of the outgoing air noet stream 19.20 in the respective channel 29.129, a respective second air noet stream 21.22 is fed via the respective second nozzle 17.18. A programming device 34 equipped with a program 39 opens valves 44 and 45 alternately according to the program via a lever means, so that an outlet 35 and an outlet 36 are connected to the respective nozzles 1 and 10.
1 air point 6, 106 inclined nozzle 7.8 and 107
．． Air is supplied to 108, thereby controlling the weft change to the shed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a device for inserting weft threads into two sheds each incorporating a plurality of nozzles and provided with a plurality of air points, taken along plane A-A in FIG. 2 is a schematic sectional view taken along plane B-B in FIG. 1 of the device shown in FIG. 1, and FIG. 3 is a sectional view showing a modified embodiment of the device in FIG. FIG. 4 is a schematic side view showing the opposing outlet ducts to the channel in the liquid state and the outflow from the second nozzle; FIG. FIG. 6 is a schematic side view showing the facing outlet ducts to and the outflow from the second nozzle; FIG. 1 is a diagram of a device for inserting weft threads into the two sheds shown in FIG.
FIG. 7 is a sectional view taken along plane CC in FIG. 6. 1.101... Nozzle, 2.102... Weft, 3゜103... Inlet rod), 4,104... Air flow, 6
゜106...Air point, 7, 8, 107, 108...
Inclined nozzle, 9.10... outflow direction, 11, 12.
111゜112...outflow), 13.14...slanted air noet flow. Margin below FIG, 3 FIGI? FIG, 5 FIG, G FIG, t

Claims (1)

[Claims] 1. A weft yarn switching device, a plurality of nozzles associated with each individual weft yarn, and duct outlets of the nozzles facing two opposite sheds, which can be opened alternately according to the glodallum. A device for inserting weft threads into two sheds of a loom, each comprising a central jet insertion device comprising air supply means, a respective inlet duct (3), (103); 3), (103) and a pair of opposed outlet ducts (11), (12) of the respective nozzles (1), (1o1): (111). (112) and intermediate each air point (6). (106) are provided to change the traveling direction of the respective weft threads (2), (102) and the respective incoming air flows (4), (104), and said air points are connected to the respective plurality of inclined nozzles (7). ), (8): (107), (108), the plurality of inclined nozzles can be opened alternately according to the grodalum, and the plurality of inclined air jet streams of the plurality of inclined nozzles (13), ( A pair of outlet ducts (11), (12) facing each other have respective outflow directions (9), (10) of (14). (112) The weft insertion devices are characterized in that they are oriented crosswise to each other. 2. Inlet air nozzles (3) and (103) are connected to the respective inlet air nozzles (1) and (101), respectively.
5). The weft insertion device according to claim 1, wherein the weft insertion device is provided with the following. 3 Two nozzles (1) on each outlet side. (101) of each pair of adjacent outlet ducts (
11), (111); (12), (112) flow out into respective common orifices (15), (16). 4. said respective pair of adjacent outlet rods of each nozzle (1'), (101) (11). (111); (12), (112) are surrounded by second air jet streams (21), (22), and said second air jet streams (21), (22) are connected to said respective adjacent outlets. Duct (11). (111): The weft thread insertion device according to claim 1, wherein the weft threads flow out from second nozzles (17) and (18) surrounding (12) and (112), respectively. 5. Said air point (6) of each nozzle (1), (101), inclined nozzle (7) of (106). (s): Exit leading into (1o7), (i08) (
2. Device according to claim 1, characterized in that the programming device (34) for starting the control air closure (37) comprising (35), (36) is a Dobby device.