JP3007351B1 - Apparatus for stretching and detecting weft yarns for jet rooms - Google Patents

Abstract

The apparatus has a system (5,5a;6,6a) to give a selective deflection to the leading section (11a) of a correctly positioned weft (11) in the weft insertion channel (2a), forming a separate unit (1a). The system (7,7a;8,10) to guide and detect an incorrectly inserted weft (11) in the insertion channel (2a) forms a second and separate unit (1b), with a single weft monitor (10) for both. The apparatus for detection and stretch of weft yarns, in a jet loom, has a system (5,5a;6,6a) to give a selective deflection to the leading section (11a) of a correctly positioned weft (11) in the weft insertion channel (2a), forming a separate unit (1a). The system (7,7a;8,10) to guide and detect an incorrectly inserted weft (11) in the insertion channel (2a) forms a second and separate unit (1b), which can slide along the reed stay (3) in relation to the first unit (1a). The second unit has two yarn guides (7,8) on different planes, with a single weft monitor (10) for both. A telescopic yarn guide (9) is a connection between at least the deflection guide (6) for the weft (11) at the first unit (1a) and the yarn guide (8) at the second unit (1b). The yarn guide (7) has a biconical entry (7a). A variable gap is between the exit (4a) of the yarn guide (4) and the entry (7a) into the next yarn guide (7). An incorrectly inserted weft (11) bridges the gap without guidance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for extending and detecting a weft thread for a jet loom, which is disposed on the outlet side of a weft insertion passage of a reed and is attached to a sleigh support of a loom together with the reed. Yarn extension and detection device).

[0002]

2. Description of the Related Art Weft stretching is performed by a single unit, detects an excessively long weft thread or a broken weft thread that may appear in some cases, and notifies the generated signal to a loom by signal transmission. And a detection device are known from EP 0 716 171.

[0003] In that case, the weft stretched in the flowing medium is
In a known device, it is guided from a weft insertion plane, which is a first plane for the weft thread guideway, to a weft thread guideway in a second plane. It corresponds to the stretching of the weft thread. When the weft expansion does not work, the weft is inserted into the weft guide path downstream of the weft insertion passage of the device, and in some cases is stretched by the airflow of the existing nozzle device, where the weft is Do not turn around.

The known device requires, in addition to the advantage that the position of the weft monitor can be determined in two planes according to the longitudinal elongation behavior of the weft, a weft monitor for each plane, respectively. There is a disadvantage that an auxiliary nozzle device (not shown) is required for stretching the weft thread because the air flow condition of the weft thread guide path in the plane is disadvantageous compared to the weft insertion path of the reed.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for selectively changing the direction of a weft yarn and extending the same, and detecting a weft yarn improperly inserted into an opening of a loom. An object of the present invention is to provide a device having a simple structure, higher reliability, and easier handling than devices known in the art.

[0006]

This object is achieved according to the invention by the features of claim 1. An important feature according to this is that the weft stretching and detecting device turns and stretches the weft yarn, and the first unit on the sleeving support of the loom with a single weft monitor. A second unit arranged so as to be relatively movable, wherein the weft monitor monitors the arrival of an incorrect weft and transmits an appropriate electric signal to a loom control device (not shown). .

The device according to the invention has a relatively low weight, since the device only requires one weft monitor and the device eliminates the middle of the thread guideway of the known device in the first plane. Finally, there is the advantage that the second unit with a single weft monitor can be adapted relatively quickly to the warp elongation behavior of the weft with only one adjustment operation.

[0008] As a result of performing a function test of the device constructed in accordance with the present invention, it is found that the obstruction of the weft flight does not occur due to the elimination of the intermediate portion of the yarn guide path extending on the first plane. Was confirmed.

Rather, the magnitude of the energy for accelerating the weft thread is still sufficient to detect the length of the weft thread that has been torn in the event of a weft thread break on the first or second plane of the second unit. is there.

In an embodiment of the solution according to the invention, the inlet of the weft thread guideway in the first plane is formed in a biconical shape. This ensures that the weft thread enters the weft thread guideway of the second unit smoothly.

In another embodiment of the solution according to the invention, the exit of the second thread path in the second plane and the entrance of the thread path of the second unit in the second plane are well known. They are connected by a variable length yarn path.

Next, the present invention will be described based on an embodiment shown in the drawings.

[0013]

DETAILED DESCRIPTION OF THE INVENTION According to FIGS. 1 to 3, the weft stretching and detecting device is incorporated in a common unit connected to the sleigh support of the loom, as is known in the prior art. Means for stretching the weft thread 11 properly inserted into the weft insertion path 2a of the lead 2 according to the present invention, rather than comprising a weft stretching and detecting device.
An independent first unit 1a having 5a and 6, 6a, 6b and an independent second unit having means 10 for guiding and detecting a weft thread 11 improperly inserted into the weft insertion passage 2a of the lead 2. , The two units 1a and 1b are disposed on the downstream side of the weft insertion passage, and the second unit 1b is mounted on the sley support 3 in the first unit 1b.
Adjustable relative to a.

For the detection of an incorrect weft thread, only one weft thread monitor 10 is provided for the two thread paths 4 and 6.

Compared to the state of the art mentioned at the outset, according to FIG. 1, according to the invention, a weft stretching and detecting device 1 according to the invention comprises a first unit 1a, ie a weft stretching device, and a second unit, ie a weft. The yarn path on the first plane between the yarn detection devices can be eliminated.

On the other hand, on the second plane, the yarn path 9 between the unit 1a and the unit 1b can be formed as a nested tube as is well known.

First unit 1a and second unit 1b
If the yarn path lying on the first plane between the two is eliminated, in another embodiment of the invention the inlet 7a of the yarn path 7 is formed in a biconical shape. As a single weft monitor 10 for monitoring two planes of the unit 1b, a well-known weft monitor can be used, and therefore, this will not be described in detail.

FIG. 2 shows the unit 1a held on the sley support 3 by the fastening pieces 3a and the weft stretching devices 5, 5a, 6, 6a incorporated therein.

FIG. 3 shows a second unit 1b which can be displaced relative to the first unit 1a. Unit 1b
Is connected to the sleigh support 3 like the unit 1a.

The conical (biconic) design of the entrance 7a of the yarn path 7 can be clearly seen in the figure. In FIG. 1, the double arrow 12 indicates that the unit 1b can be relatively displaced.

[Brief description of the drawings]

FIG. 1 is a front view of a weft stretching and detecting device including first and second units.

FIG. 2 is a partial cross-sectional view of the first unit viewed from a direction A in FIG.

FIG. 3 is a view of a second unit as viewed from a direction B in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weft stretching and detecting device 1a 1st unit (weft stretching device) 1b 2nd unit (weft detecting device) 2 Lead 2a Weft insertion passage 3 Sleigh support 4 Thread path 5 Flow path 5a Exit 6 Thread path 6a Inlet 7 Yarn 7a Inlet 8 Yarn 10 Weft monitor 11 Weft 11a Tip

Continuation of the front page (72) Inventor Hans-Dieter, Skol Lindau, Germany, Bayer Schuttler, 19 (56) References JP-A-8-209499 (JP, A) JP-A-11-256453 (JP, A) Japanese Utility Model Application Hei 5-46985 (JP, U) Japanese Utility Model Application Sho 62-170784 (JP, U) U.S. Patent 5,606,998 (US, A) U.S. Patent 5,226,458 (US, A) WO 97/13017 (WO, A1) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) D03D 51/34 D03D 47/28-47/38

Claims (5)

(57) [Claims] 1. A weft thread for a jet loom, which is disposed on the outlet side of a weft insertion passageway (2a) of a reed (2) and attached to a sleigh support (3) of a loom together with the reed (2). An apparatus (1) for stretching and detecting a yarn path (4) located at a first plane with a leading end of an appropriate weft inserted into a weft insertion passageway (2a) of a lead (2). First means (5, 5a; 6, 6a) for selectively deflecting from the to the yarn path (6) leading to the second plane, and inserted into the weft insertion passage (2a) of the lead (2). And second means (7, 7a, 8, 10) for guiding and detecting an inappropriate weft thread (11), wherein the first means (5, 5a; 6, 6a) is formed as a first unit (1a), said second means (7, 7a, 8, 10) is formed as a second unit (1b), wherein the second unit (1b) is movable on the sley support (3) relative to the first unit (1a); The second unit (1b) has a yarn path (7) on the first plane and a yarn path (8) on the second plane, respectively, and the detecting means (10) has two yarn paths (8). 7. A device comprising a single weft monitor for monitoring (7, 8). 2. A yarn path (6) of at least a first unit (1a) for changing the direction of a weft yarn, and a second unit (1).
Device according to claim 1, characterized in that the yarn paths (8) of b) are connected to each other by a telescopic yarn path (9). 3. The device according to claim 1, wherein the entrance of the thread path is formed in a biconical shape. 4. The method according to claim 1, wherein there is a distance between the exit (4a) of the yarn path (4) and the entrance (7a) of the yarn path (7), and this distance is variable. Equipment. 5. The device as claimed in claim 4, wherein the inserted incorrect weft thread (11) communicates the distance without restriction.