JPH0447060B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a weft detection device for a fluid jet loom.

BACKGROUND ART Generally, the length of the weft yarn to be inserted by a jetting fluid is measured in advance to a predetermined length and stored. As such a storage type, a so-called drum length measuring device or a so-called air pool type length measuring device shown in FIG. 1 is provided. In the length measuring device shown in the figure, the weft yarn Y supplied from the weft supply section 1 is measured by a length measuring roller mechanism 2 and ejected from a storage nozzle 3, which opens and closes in synchronization with the weft insertion timing of the loom. When the gripper 4 for gripping the weft is closed, the weft Y is ejected and stored in the direction of the storage pipe 5 having the slit 5a. When a predetermined amount of the weft yarn Y is stored, the gripper 4 is opened and the main nozzle 7 on the slay 6 is activated.
As shown in FIG. 2, a large number of weft yarns Y are arranged in parallel on the slay 6, and the weft yarns are passed through a main nozzle into a weft guide path S formed by a weft guide member 8 having a weft guide hole 8a and a slit-like exit opening 8b. The injection weft is inserted from 7. The weft yarn Y inserted into the weft guide path S is assisted in flight by auxiliary jetting fluid from a plurality of auxiliary nozzles 9 arranged at predetermined intervals along a large number of weft guide members 8.

A predetermined number of the weft guide members 8 and the auxiliary nozzles 9 are attached to a plurality of blocks (in the illustrated example, there are six, indicated by 10, 11, 12, 13, 14, and 15). ,1
The auxiliary nozzles 9 1, 12, 13, 14, 15 have fluid passages 10a, 11 provided therein.
It is connected to the sub tank 22 via a, 12a, 13a, 14a, and 15a. Note that this sub-tank 22 is connected to a fluid supply source (not shown) via a pressure regulator 23 (of course, the main nozzle 7 is also connected to the fluid supply source via a valve 40, a sub-tank 41, and a pressure regulator 42). ). Fluid is ejected from the auxiliary nozzle 9 through valves 16, 17, 18, 1 provided corresponding to each block 10, 11, 12, 13, 14, 15, respectively.
This is done by sequentially opening the nozzles 9, 20, and 21 from the main nozzle 7 side in synchronization with the flight timing of the weft Y. The injection timing of this auxiliary nozzle 9 has a great influence on the flying condition of the weft threads flying in the weft guide path S, which not only affects the quality of the woven fabric but also is related to the occurrence of weft insertion errors. come. Therefore, the injection timing of the auxiliary nozzle 9 must be set reliably.

Therefore, in the past, the timing of arrival of the weft at a predetermined position was measured using a strobe device, and the injection timing of the auxiliary nozzle 9 was estimated. However, in this type of strobe survey method, since it ultimately relies on human visual judgment, checking the stability of weft thread flight is extremely difficult and lacks certainty. or,
This strobe survey is conducted from above the loom,
When the number of warp threads, especially the number of needle threads, increases, it is impossible to grasp the flying state of the weft threads even if image processing is performed using a magnifying close-up lens, and this strobe survey method has reached its limit.

Purpose The present invention has been made in consideration of the above-mentioned problems, and its purpose is to detect the weft yarn during weft insertion, measure the arrival timing of the weft yarn at a predetermined position, and, based on this measurement result, to detect the weft yarn during weft insertion, and to detect the arrival timing of the weft yarn at a predetermined position. It is an object of the present invention to provide a weft detection device for a fluid injection type loom, which can reliably check the setting of the injection timing of the weft and which can also be used as a weft insertion error detector.

Configuration In order to achieve the above object, the present invention provides a weft yarn passing through the weft guide hole to the peripheral wall portion of the weft guide hole of a weft detector having a weft guide hole similar to that of the weft guide member and a slit-like escape opening. The light emitting part and the light receiving part are arranged opposite each other so that the light can be detected over almost the entire area of the guide hole.

Embodiment Examples 1 and 3 of embodiments of the present invention will be described below.
To explain based on the figure, reference numeral 24 denotes a plurality of weft detectors disposed between the weft guide members 8 at predetermined positions on the slay 6, and as shown in FIG. A detector guide member 25 made of a permeable resin having a similar shape and having a weft guide hole 25a and a slit-like escape opening 25d, and a weft guide hole 25a of the guide member 25.
The guide hole 25a includes a light projecting part 26 and a light receiving part 27, which are arranged opposite to each other on the peripheral wall of the guide hole 25a with the guide hole 25a sandwiched therebetween in the front-rear direction. The light projecting section 26 includes a distal end portion of a groove 25b on one side of the guide member 25 extending from its base end to the rear peripheral wall portion of the weft guide hole 25a (the left side in FIG. 3 is the rear side of the guide member 25); That is, it is arranged near the rear side of the weft guide hole 25a.
On the other hand, the light receiving section 27 is provided at the tip of a groove 25c that branches from the groove 25b and reaches the front peripheral wall of the weft guide hole 25a, that is, near the front side of the weft guide hole 25a. The lead wire 28 connected to the light emitter 26 passes through the groove 25b, and the lead wire 29 connected to the light receiver 27 passes through the groove 25c to be electrically connected to the counter device 30 shown in FIG. has been done. Both grooves 25b and 25c are molded with permeable resin.

Note that if the detector guide member 25 is made of a non-porous material such as aluminum, both grooves 2
5b and 25c must be formed so as to reach the weft guide hole 25a.

The light projecting unit 26 is a light projecting element 26 such as a light emitting diode.
It is composed of a plurality of a arranged in the vertical direction, and
The light receiving section 27 is made up of a vertically elongated light receiving element 27a, and the light projected from the light projecting section 26 covers almost the entire area of the weft guide hole 25a and reaches the light receiving section 2.
Reach 7. That is, the weft yarn Y passing through the weft guide hole 25a is reliably detected by the weft yarn detector 24.

Note that 32 is a reed.

The counter device 30 receives a detection signal sent from the weft detector 24 and a machine rotation angle detection device 3.
1 (detecting a predetermined rotational angle position of the machine base), the difference from the time when the rotational angle detection signal is transmitted to the time when the weft detection signal is transmitted is digitally displayed on the display unit 33 in units of rotational angle. Note that the counter device 30 is
As shown in FIG. 4, it has an amplifier circuit 30a, a waveform shaping circuit 30b, a counter circuit 30c, and a clock circuit 30d.

Now, in order to adjust the setting of the injection timing in the auxiliary nozzle 9, the loom is operated on a trial basis, and the weft yarn Y is caused to fly. When the weft yarn Y reaches the weft yarn detector 24 provided in the block 10, the counter device 30 provides the digital display. After this weft insertion is completed, the machine is stopped and the injection timing of the auxiliary nozzle 9 in the block 10 is set and adjusted.
If 1 is a mechanical valve that opens and closes in synchronization with the rotation of the machine, each valve 16, 17, 18, 19,
Since the operational connection between 20 and 21 and the rotary drive source of the machine base is configured to be separable, this operational connection is released and the opening of the mechanical valve 16 is adjusted based on the digital display. This opening adjustment is different from the valve opening adjustment based on visual judgment in the conventional strobe method, and the valve opening adjustment is performed based on reliable weft detection, which is optical weft detection by the weft thread detector 24. The timing of fluid injection from the auxiliary nozzle 9 to the coming weft can be effectively set and adjusted.

After completing the adjustment of the injection timing of the auxiliary nozzle 9 in block 10, the valve 16 is operatively connected to the rotary drive source, and the machine is operated again to make the weft yarn Y fly. Then, the weft detector 24 provided in the block 11 adjusts the opening of the mechanical valve 17 in the same manner as described above based on the digital display when the weft arrives. If the setting and adjustment of the injection timing of the auxiliary nozzles 9 in each block 12, 13, 14, and 15 is performed in the same manner, the injection timings of all the auxiliary nozzles 9 can be set accurately.

As described above, by using the weft yarn detector 24 of the present invention, the timing at which the weft yarn reaches a predetermined position can be set with high accuracy, and the injection timing of the auxiliary nozzle 9 can be reliably set based on this highly accurate measurement. can do. Accurate setting of the injection timing of the auxiliary nozzle 9 greatly contributes to reducing variations in the quality of woven fabric products between looms due to variations in loom assembly.

By the way, in the above embodiment, the weft yarn detector 24 was used to adjust the setting of the injection timing of the auxiliary nozzle 9, but the
If electromagnetic valves are used in place of mechanical valves 8, 19, 20, and 21, based on the weft detection by the weft detector 24, the weft will be detected from the auxiliary nozzle 9 provided in the block next to the block provided with the same detector 24. The fluid jet can be controlled. That is, in the embodiment, each block 10, 11, 12, 13, 14,
One weft detector 24 was provided in each block 15, but here, each block 10, 11, 12,
A plurality of weft yarn detectors 24 are arranged at predetermined intervals in each of the weft yarns 13, 14, and 15, and the speed of the weft yarn passing through each block is calculated, and based on this calculated speed, the auxiliary nozzle 9 of the following block is detected. The injection timing can be controlled. Therefore, the auxiliary nozzle 9
The jetting is relay controlled for each block 10, 11, 12, 13, 14, 15 based on the weft detection by the weft detector 24.

Furthermore, the weft detector 24 of the present invention can also be used as a weft insertion error detection device, and
Weft insertion errors can be detected more quickly and effectively than in the conventional weft detector in which light emitting/receiving elements are arranged opposite to each other with 5d in between.

It should be noted that the weft detector of the present invention is not limited to the configuration of the above-mentioned embodiment, and for example, the weft guide hole 25
A light projecting section and a light receiving section may be provided so as to sandwich a in the vertical direction, or the arrangement of the light projecting and receiving section in this alternative example and the arrangement of the light projecting and receiving section in the previous embodiment may be used together.

Effects As detailed above, the weft detection device of the present invention can accurately set the injection timing of the auxiliary nozzle, and when controlling the injection of the auxiliary nozzle with an electromagnetic valve, the weft detection device of the present invention can It has the excellent effect that the auxiliary nozzle spray can be performed in a relay-like manner and can also be used as a weft insertion error detection device.

[Brief explanation of the drawing]

Fig. 1 is a schematic rear view showing a weft insertion device in a fluid jet loom, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 shows an embodiment of the weft detection device of the present invention. The side view shown in FIG. 4 is a block diagram showing the circuitry within the counter device. Weft detector 24, detector guide member 25, weft guide hole 25a, escape opening 25d, light projector 26,
Light receiving part 27, weft Y.

Claims (1)

[Scope of Claims] 1. A large number of weft guide members each having a weft guide hole and a slit-shaped exit opening for allowing the weft to escape from the hole are arranged in parallel on the sleigh, In a fluid jet loom, in which a weft detector having an escape opening and detecting a weft inserted into a weft guide passage formed by each weft guide hole is arranged in parallel on the slay together with the weft guide member, the weft A weft in a fluid injection type loom, characterized in that a light emitting part and a light receiving part are disposed opposite to each other on a peripheral wall of a weft guide hole of the detector so that the weft passing through the guide hole can be detected over almost the entire area of the guide hole. Detection device. 2. The weft detecting device for a loom according to claim 1, wherein the light projecting section is configured by arranging a plurality of light projecting elements vertically, and the light receiving section is comprised of a vertically elongated light receiving element.