JPH0686697B2 - Weft detection device for fluid jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a weft yarn which is jetted by a jet fluid in a weft guide passage formed by a reed and arranged in a weft width region where warps are present. The present invention relates to a device for detecting.

(Prior Art) Generally, in a fluid jet loom in which a weft yarn is inserted into a warp shed by a jet fluid, the weft insertion state of the weft yarn has a great influence on the fabric quality. Therefore, conventionally, as shown in FIG. 8, in order to detect whether or not the tip of the weft Y ejected from the main nozzle 1 has reached a predetermined area,
A weft detector 2 is provided outside W1 or between the waste ears W1 and the woven fabric W.
Is installed. An example of such a conventional device is
It is disclosed in JP-A-54-24501 or JP-A-55-112342. In the former conventional device, the light projection passes through the entire cross section of the weft guide passage formed by the reed, and this light projection is received by the light receiving element closely arranged.
On the other hand, in the latter conventional device, the projection light reflected by the weft thread is received by the light receiving element on the back surface thereof through the rod-shaped lens arranged in the weft guide path direction. That is, these weft detection devices are intended to improve the detection accuracy of the weft.

(Problems to be Solved by the Invention) However, when a weft detecting device with improved weft detection accuracy is provided outside the woven fabric W as shown in FIG.
Although weft insertion errors can be detected with certainty, there is a defect that they cannot be detected early. That is, the timing for detecting a weft insertion error must be adjusted to the arrival point of the weft tip portion. For example, when the weft insertion tip reaches only the middle of the woven fabric, the weft insertion error is detected by the weft detection. This must be done at a time when it is expected to reach the installation position of the vessel, which delays detection of weft insertion error.

In order to detect a weft insertion error at an early stage, the weft yarn detector may be arranged in the weaving width region of the woven cloth. However, in the latter conventional device, the warp yarns cannot be pushed apart to enter the warp yarn opening. Such correspondence is impossible. On the other hand, in the former conventional device, by arranging the light projecting portion and the light receiving portion in opposition to the peripheral wall of the guide hole in the system in which the weft guide passage is formed by the row of guide holes of the weft guide member that are provided upright on the sley. It can be installed in the width range of the woven fabric.

However, in the method of forming the weft guide passage by the reed, it is extremely difficult to attach the light emitting / receiving unit to the reed due to the restriction of the thickness of the reed.

Also, when weft detection is performed outside the throwing ears, an extra weft must be inserted in order to perform reliable weft detection, which leads to waste of the weft and minimizes wasted weft. It cannot be adapted to the current situation.

Configuration of the Invention (Means for Solving the Problems) In a weft detecting device of a light emitting and receiving system, which detects a weft that is jetted by a jet fluid in a weft guide passage formed by a reed arranged on a sley, In the weaving width region in which the warp exists, a bar-shaped support member that separates the warp during the weft insertion to a position facing the weft guide passage in the warp opening and retreats to the outside of the warp after the weft insertion is attached to the sley. It is arranged on the cloth fell side, and a light projecting / receiving section for detecting the weft in the weft guide passage is provided at the tip of the rod-shaped support.

(Operation) That is, when the reed moves backward after beating, the support body having the light projecting / receiving unit picks up the warp that is forming the opening and enters into the opening, so that the weft guide passage formed by the reed is guided. The weft is detected when the tip of the weft that has been guided by flight reaches the position of the tip of the support, and if a weft insertion error that the tip of the weft does not reach the tip of the support occurs The loom is stopped based on the weft insertion error detection signal from the light emitting / receiving unit. Since the above-mentioned support can be installed in a desired position within a weaving width and in a desired number, fine control can be performed.

(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS.
Describing on the basis of the above, a reed 12 having a function of guiding the weft Y ejected from a weft inserting main nozzle (not shown) is erected on the sley 11. That is, the front side of the loom (the left side in FIG. 2) is attached to the large number of reeds 13 forming the reed 12.
Is provided with a guide hole 13a, and a row of the holes 13a forms a guide passage S for the weft.

Multiple support blocks on the front of the sley 11 corresponding to the reeds 12.
14 are fixed at appropriate intervals so that the mounting position can be adjusted, and an auxiliary nozzle 15 is inserted and fixed in the block 14. An injection hole (not shown) provided at the tip of the nozzle 15 is arranged in the vicinity of the weft guide passage S, and the auxiliary injection fluid from the injection hole is flown into the guide passage S to fly the weft Y. It is designed to help run.

A shaft 16 is rotatably arranged in the longitudinal direction of the sley 11 on the lower front side of the sley 11, and is rotationally driven in synchronization with the rotation of the machine base. Coaxial 16 has multiple cam plates 1
7, 18 (only two of which are shown in the drawing) are arranged and fixed in the weaving width region of the woven cloth W, that is, at positions where warps are present, with the cam plates 17, 18 having the same angle. Installed in position. The cam plates 17 and 18 are set at different angles so as to have a phase difference according to the flying state of the weft.
16 may be provided. Between the cam plates 17 and 18 and the sley 11, cylindrical guide bodies 19 and 20 made of an insulating material are arranged and fixed outside the swing range of the sley 11, respectively. Is a cam follower 21 also made of an insulator.
Is slidably and non-rotatably fitted. The base end of the cylindrical cam follower 21 is pressed against the cam surfaces of the cam plates 17 and 18 by the spring 22 housed in the guide bodies 19 and 20.

Rod-shaped supports 23 and 24 are fixed to the tip end side of each cam follower 21, and project from the guides 19 and 20 slidably upward. As shown in FIG. 4, the supports 23,2
At the tip of 4, there is provided a light emitting section 25 made of a light emitting diode and a light receiving section 26 made of a phototransistor.
These light emitting / receiving parts 25, 26 are provided on the peripheral surface of the cam follower 21 via lead wires L1, L2, L3 as shown in FIG. 2 and have slip terminals 21a (only one light emitting / receiving part is shown in the drawing. twenty five,
There are three lead wires connected to 26, and there are three slip terminals accordingly, and they are electrically connected to each other.
Then, on the guide body 19, 20 side, the slip terminal 27 is slidably contactable with the slip terminal 21a corresponding to the slip terminal 21a.
Is provided, and the slip terminal 27 is electrically connected to a machine base controller (not shown).

The tips of the supports 23, 24 are sharpened as shown in FIG. 5 (a) so that the warp yarns T can be easily separated. The shape of the tips of the supports 23, 24 is the fifth.
Figure (b) is also valid.

In this embodiment, when the reed 12 is near the retracted position shown in FIG. 2, that is, at the weft insertion time of the weft, the support 2
The tips of the support members 23, 24 should be positioned so that the tips of the support members 23, 24 are located immediately in front of the weft guide passage S, and at other times.
The cam shapes of the cam plates 17 and 18 are set so as to be separated from 2.

Now, as shown in Figs.
Is positioned immediately in front of the weft guide passage S by entering the warp opening, and the weft Y can be detected by the light projecting / receiving functions of the light projecting / receiving sections 25 and 26. Therefore, if the tip of the weft Y does not reach the position of the support 23 for some reason, the light projecting / receiving sections 25 and 26 provided at the tip of the support 23 cause an expected arrival time of the tip of the weft Y. A weft insertion error detection signal is issued and the machine stand is stopped.

When the tip of the weft Y reaches the position of the support member 23 but does not reach the position of the support member 24, the light emitting and receiving units 25 and 26 of the support member 24 perform the light emitting and receiving operations similarly to the above. A weft insertion error detection signal is issued at the expected arrival time of the tip of the weft Y, and the machine stand is stopped.

Generally, in a high-speed loom such as a fluid jet loom, the machine base is stopped after inertial rotation of the machine base to some extent in consideration of damage prevention of each part. Therefore, there is a possibility that not only the miss yarn missed by the weft insertion but also the weft yarn following the miss yarn may be woven into the woven cloth W during the inertial rotation of the machine base. In order to remove the miss yarn that has been woven into the woven cloth, the weft yarn that has been woven following the miss yarn must also be removed, and such removal work is very complicated. Cause a decrease in the operating rate of. Therefore,
If the weft insertion error is detected earlier in the weaving width region of the woven fabric as in this embodiment, the machine base can be stopped earlier. As a result, it is possible to control the loom so that the weft yarn, which is inserted after the miss yarn, is not woven into the woven fabric.

Further, since the weft detection is performed within the weaving width region of the woven fabric, it is not necessary to insert an extra weft.

When the weft Y is properly inserted into the weft, the operation of the loom is continued, and the reed 12 moves forward again to perform the beating operation. At this time, the cam followers 21 are projected from the cylindrical guide bodies 19, 20 by the action of the springs 22 along with the rotation of the cam plates 17, 18 that are rotated in synchronization with the rotation of the machine base, and the support bodies 23, 24 Are drawn into the guide bodies 19 and 20. Therefore, there is no possibility that the reed 12 will come into contact with the supports 23 and 24 before the repulsion time shown in FIG. When the reed 12 is retracted from the state shown in FIG. 3 to the state shown in FIG. 2, the tips of the supports 23 and 24 follow the reed 12 in a manner opposite to the above-described beating operation. The warp yarn T is separated and enters the warp yarn opening. Then, the weft detection operation similar to the above is performed.

The present invention can be applied to, for example, the embodiment shown in FIGS. 6 and 7 in addition to the above-mentioned embodiment. In the embodiment shown in FIG.
A groove 29 into which the head side of the bolt 28 can be inserted is provided in the longitudinal direction of the bolt 28, and a support block 32 with a support 31 having a light emitting and receiving portion at the tip is attached by a bolt 28 and a nut 30 to the front surface of the sley 11. It is tightened and fixed so that its position can be adjusted. That is, the light emitting and receiving portion provided at the tip of the support 31 is always arranged in the vicinity of the weft guide passage S, and
The support 31 can be attached / changed to an appropriate position by tightening / loosening the nut 28 and the nut 30, and the weft detection position can be appropriately set according to a change in the width of the woven cloth. By installing a large number of such weft detectors, it is possible to make a weft insertion error detection system between weft detectors in which a weft detection error by one weft detector is corrected by another weft detector. The same applies to the examples.

In the embodiment shown in FIG. 7, the slide body 34 is attached to the lower surface of the support block 33 fixed to the front surface of the sley 11 so that the mounting position can be adjusted.
The cam follower 35a at the base end of the slide body 34.
A support member 35 having a light emitting and receiving portion at its tip end is fitted and fixed, and a cam follower 35a is attached to the cam member 3 by a spring 37.
It is pressed against the cam surface of 6. Same cam body 36 is Slei 1
1 has a swing axis center, that is, arcuate surfaces 36a and 36b centered on a rocking shaft (not shown), the cam follower 35a is located on the arcuate surface 36a during the weft inserting period, and has an arc during the weft inserting period. It is located on surface 36b. According to this embodiment, the weft detecting device can be made compact.

Further, in the present invention, it is possible to employ an auxiliary nozzle as a support.

EFFECTS OF THE INVENTION As described in detail above, the weft detection device of the present invention has an excellent effect that a weft insertion error can be detected early and the machine frame control can be easily performed thereafter. Further, according to the present invention, as described above, since the detection device can freely select the mounting position within the weaving width region, for example, it is provided at the center of the weaving width to detect the flight timing of the weft yarn early, and the next weft insertion. It is possible to perform a wide and fine control such as automatic control of the injection timing at this time, and real-time control of the injection timing of the downstream side sub-nozzle provided at a plurality of locations within the area.

[Brief description of drawings]

1 to 5 (a) show an embodiment embodying the present invention, FIG. 1 is a perspective view showing the vicinity of a sley, FIG. 2 is a longitudinal sectional view showing a weft detection state, and FIG. Is a longitudinal cross-sectional view showing a beating condition, FIG. 4 is a side view of a main part showing the vicinity of the weft guide passage at the time of weft detection, and FIG. 5 (a) is an enlarged cross-sectional view taken along the line AA of FIG. FIG. 6B is a vertical cross-sectional view showing another shape of the front end of the support, and FIG. 6 is a perspective view of a main part showing another example of the present invention.
FIG. 7 is a longitudinal sectional view showing another example of the same, and FIG. 8 is a schematic plan view showing the installation position of a conventional weft detector. Reed 12, support 23, 24, 31, 35, light projecting portion 25, light receiving portion 26, weft guide passage S, weft Y.

Claims (5)

[Claims] 1. In a weft detection device of a light emitting and receiving system for detecting a weft yarn flying by a jet fluid in a weft guide passage formed by a reed provided on a sley, a weft width region in which a warp yarn is present. At the time of weft insertion, a bar-shaped support member is arranged on the cloth fell side of the sley, where the bar-shaped support member is arranged so as to separate the warp yarns into a position facing the weft yarn guide passage in the warp yarn opening, and retreat to the outside of the warp yarns after the weft insertion. A weft detection device in a fluid jet loom, characterized in that a light projecting / receiving unit for detecting the weft in the weft guide passage is provided at the tip of the rod-shaped support. 2. The support is reciprocated by the action of a cam plate and a spring which are rotated in synchronism with the machine base, and when the weft is inserted, the tip of the support comes close to the weft guide passage. A weft detection device in the fluid jet loom according to item 1. 3. A support body is fixed to a slide body slidably fitted to a support block fixed to the sley in a longitudinal direction thereof so that its mounting position can be adjusted. The weft detection device for a fluid jet loom according to claim 1, wherein the weft detection device is reciprocally moved by the action of the body and a spring, and a tip end portion of the weft insertion guide is close to the weft guide passage. 4. A weft detection device for a fluid jet loom according to claim 1, wherein the support is attached to a support block fixed to the sley so that the attachment position can be adjusted in the longitudinal direction. . 5. A weft yarn detecting device in a fluid jet loom according to claim 4, wherein the support is an auxiliary nozzle.