JPS6123028Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a weft detection device for a shuttleless loom.

Prior Art In general, in a loom, if the weft threads are not inserted normally, uneven weaving occurs in the woven fabric, making it impossible to obtain the desired woven fabric. It is common practice to stop the loom when a loading error occurs.

Therefore, as shown in FIG. 1, there is a guide passage 1a that guides the weft (not shown) and a jet fluid such as air that conveys the weft, and the weft inserted into the guide passage 1a during beating. In a fluid jet loom in which a large number of guide pieces 1 each having a slit-like escape passage 1b for escaping from the guide passage 1a are arranged side by side on a slay 2, as shown in FIG. Similarly, for a guide piece 3 having a guide passage 3a and a slit-like escape passage 3b, a light emitting element 4 and a light receiving element 5 are placed between the guide passage 3b.
A weft detector 6, in which the weft yarn detectors 6 and 6 are oppositely arranged, is disposed at an appropriate position between the guide pieces 1.

Then, as shown in Fig. 1, Slay Sword 7
When the weft thread is tilted in the direction of the arrow about the locking shaft 8 to perform beating, the weft thread passes through the escape passage 3b of the weft thread detector 6 and is projected from the light emitting element 4 to the light receiving element 5. When the light passes through the light, the amount of light entering the light receiving element 5 temporarily decreases, and the signal current (hereinafter referred to as thread signal S) indicating a change in light amount (reduction) reaches the detection level as shown by the solid line in Figure 8. If the signal reaches the controller (not shown) from the light-receiving element 5 via the lead wire 9, the operation of the loom continues; on the other hand, if a weft insertion error occurs and the weft thread is not passed through the escape passage 3b. Therefore, if the thread signal S is not generated, the loom is stopped.

Furthermore, as shown in FIG. 3, the weft detector 6 is provided with a groove 3c on one side of the non-transparent detector guide piece 3, and a light emitting element 4 and a light receiving element 5 are provided in the groove 3c.
and the lead wire 9, and the groove 3c was filled with synthetic resin, but the light emitting element 4 was used to prevent the accumulation of fluff and to prevent the weft passing through the escape passage 3b from being caught.
It is also necessary to fill the groove 3c in front of the light-receiving element 5 with a transparent resin, so that the light projected from the light-projecting element 4 is further scattered by the resin.

However, the time when the weft thread passes through the escape passage 3b is when the warp thread T is almost closed (the upper and lower warp threads T are densely packed on the same plane), and therefore the light scattered by the translucent resin is is reflected by the warp threads T densely arranged on almost the same plane, and the reflected light is sent to the light receiving element 5, so that the weft threads pass through the escape passage 3 during beating.
Even after passing through point b, the amount of light received by the light receiving element 5 does not decrease much, and therefore, as shown by the chain line in FIG. 8, the thread signal S does not reach the detection level and the loom stops. There was a defect.

Purpose The purpose of this invention is to
It is an object of the present invention to provide a weft yarn detection device for a shuttleless loom, which can reliably detect inserted weft yarns and prevent unnecessary stoppage of the loom.

Embodiment Hereinafter, an embodiment in which the present invention is embodied in a fluid jet loom will be described based on FIGS. 4 to 7.
is one of a plurality of guide blocks arranged in the weft insertion direction (arrow direction in Fig. 4) of the weft (not shown) with respect to the slay (not shown), and It is arranged near the weft end opposite to the weft insertion side.

To explain this block stand 11, 12
13 is a block stand; 13 is a plurality of guide pieces arranged in parallel on the block stand 12; a guide passage 13a that guides the weft yarn and the jetting fluid that conveys the same yarn;
It has a slit-like escape passage for allowing the weft to escape from the guide passage 13a during beating.
14 is a weft detector disposed between the guide pieces 13;
Reference numeral 15 denotes an auxiliary nozzle that injects auxiliary jetting fluid to ensure the running of the weft. Note that 16 indicated by a chain line in FIG. 7 is a reed.

Next, the weft detector 14 will be described in detail based on FIGS. A guide passage 17a and a slit-shaped escape passage 17b are formed. 1
8a is a groove formed on one side of the detector guide piece 17 from its base end to the distal end of one arm 18; 19a is a groove formed on the other side of the guide piece 17; This groove is provided from the tip to the through hole 17c which is provided halfway through the groove 18a. As shown in FIGS. 6 and 7, a light emitting element 20 such as a light emitting diode and a lead wire 21 connected to the element 20 are connected to the groove 18a, and a light receiving element 22 such as a phototransistor and a lead connected to the element 22 are connected to the groove 18a. A wire 23 is disposed in the groove 18a from the groove 19a through the through hole 17c. Further, the vicinity of the light emitting element 20 in the groove 18a and the vicinity of the light receiving element 22 in the groove 19a are filled with a translucent resin.
The other portions are filled with non-transparent resin to constitute the weft detector 14.

Next, regarding the embodiment configured as described above,
The effect will be explained.

Now, when weft insertion is performed normally and the weft yarn escapes from the guide path 17a through the escape path 17b as a result of beating, the same yarn crosses the light running between the light projecting element 20 and the light receiving element 22. However, the light projected from the light projecting element 20 is scattered toward the groove 18a by the translucent resin covering the element 20, and the weft yarn is on almost the same plane as when the removed yarn passes through the escape passage 17b. The scattered light is reflected by warp yarns (not shown) that are closely packed together. However, the weft detector 1 of the present invention
4, the groove 19a in which the light-receiving element 22 is disposed is provided on the side opposite to the groove 18a in the arm portion 19, so that the reflected light is blocked by the non-light-transmitting arm portion 19, and the reflected light is Light is rarely received by the light receiving element 22. Therefore, as shown in Figure 8,
The weft can be reliably detected by preventing a situation in which the yarn signal S indicating a change (decrease) in the amount of light due to the weft passing through the escape passage 17b does not reach the detection level.

Furthermore, in the present invention, since the grooves 18a and 19a are filled with synthetic resin, the detection ability is not reduced due to the accumulation of fluff near the light projecting element 20 and the light receiving element 22. Furthermore, when the weft yarn passes through the escape passage 17b, there is no fear that the weft yarn will be caught in the grooves 18a, 19a.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, the through hole 17c may be omitted and the groove 19 may be omitted.
a to the base end of the detector guide piece 17, or use a light guide such as a glass fiber instead of the light emitting element 20 and its lead wire 21 or the light receiving element 22 and its lead wire 23, etc. ,
It is also possible to make arbitrary changes and embodiments without departing from the spirit of the present invention.

Effects As detailed above, the present invention has an excellent effect of being able to reliably detect the inserted weft yarn and prevent unnecessary stoppage of the loom when weft insertion is performed normally. .

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the main parts showing weft insertion and beating in a fluid jet loom, Figure 2 is a right side view showing a conventional weft detector in a fluid jet loom, and Figure 3 is a guide for the detector. Right side view showing the piece,
Fig. 4 is a rear view showing a guide block equipped with a weft detector embodying the present invention, Fig. 5 is a right side view showing a guide piece for the detector, and Fig.
Figure 7 is a right side view showing the arrangement of the light emitting element, light receiving element and lead wire, and Figure 8 is a signal current indicating the amount of light received by the light receiving element. FIG. Guide piece...13, Weft detector...14, Detector guide piece...17, Guide passage...17a, Escape passage...17b, Through hole...17c, Arm part...1
8, 19, Groove... 18a, 19a, Light projecting element...
20, Light receiving element...22, Lead wire...21,2
3.

Claims (1)

[Claims for Utility Model Registration] 1. On the upper surface of the slay, a large number of guides each having a weft guide path and an escape path for letting the weft escape from the guide path during beating are arranged in parallel in the weft insertion direction, Similarly, a weft detector guide having a pair of arm portions forming a weft guide path and an escape path is disposed between the guides, and a light emitting portion and a light receiving portion are disposed opposite to each other in both arm portions to form a weft guide path. In a shuttleless loom capable of detecting escape from the loom, both arms are formed of a non-transparent material, grooves are formed on opposite sides of each arm, and the tips of the grooves are Weft detection in a shuttleless loom, characterized in that a light projecting part and a light receiving part are housed in opposing configurations, respectively, and a light-transmitting member is filled in at least both grooves on mutually opposing sides of the light projecting part and the light receiving part. Device. 2. The weft detection device for a shuttleless loom according to claim 1, wherein both grooves house lead wires connected to the light projecting section and the light receiving section and are filled with synthetic resin. 3. The weft detection device for a shuttleless loom according to claim 2, wherein the weft detector guide has a through hole for guiding the lead wire from one groove to the other groove. 4. The shuttleless loom according to claim 1 of the utility model registration claim, wherein both grooves are provided on opposite sides of the weft detector guide from the tip of the arm to the base end of the weft detector guide. Weft detection device.