JPH0841758A - Weft sensor for water jet loom - Google Patents

Abstract

PURPOSE: To provide a structure capable of preventing scattered water from directly rushing into a cut open part of a weft yarn detector, preventing a weft yarn from being caught with a cover even when the weft yarn sways and further scattered water scattered from a surface located below the cover from entering a light beam passage part. CONSTITUTION: This weft yarn detector is obtained by installing a tilted guide surface 9 of a protruding constitution for outwardly and downwardly guiding scattered water on the collision lateral face for jetted water, arranging a scattered water buffering space 8 provided by mounting a planar cover 12 covering a weft yarn passage gap path including a circular arc-shaped guide part on the outside and further providing a slope 25 in the direction to downwardly scatter the collision scattered water on the collision lateral face for the jetted water located below the planar cover 12. A signal from the true weft yarn can be raised according to the above constitution and by arranging a light projector and receiver at a position of a cut open part 3 distant from the shed guide part. Thereby, overlooking of the weft yarn or no-load stop of a loom can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet loom and, more particularly, to a weft thread detecting device for the same.

[0002]

2. Description of the Related Art With the spread of water jet loom in recent years, an enormous amount of fabric is woven by a loom. In this case, it is judged whether the weft of the loom has passed normally, and if it is not normal, the loom is stopped. Therefore, a maintenance operation is required to perform maintenance work to restore normal operation. 2. Description of the Related Art Conventionally, as a weft yarn monitoring device for a water jet loom, a device provided with a high-voltage pole and a detection pole, which are arranged at an end of a weft-shaping reed and to which a high-voltage DC voltage is applied, has been used. When the weft thread is passed through so that it is in contact with the high-voltage pole and the detection pole, the wetting thread wet with water causes a current to flow between the high-voltage pole and the detection pole, so the presence of the weft thread is detected by detecting this current. We were able to. In recent years, the use of photosensors has become widespread. The light emitter and the light receiver are arranged on a straight line, and when the weft thread passes between the light emitter and the light receiver, the light beam is momentarily interrupted, so the light receiver receives the change and the load resistance of the light receiver converts the current conversion signal. Is taken out and the presence of the weft thread is detected.

A method for detecting a weft thread by using this optical sensor is disclosed in Korean Utility Model Publication No. 93-5429. Here, between the upper main body (1) and the lower main body (1 ') of the weft sensing device of the water jet loom including the guide groove (2) and the notch groove (4) and including the light emitting and receiving device. An incision part (3) forming a relatively narrow gap is provided, and the light projecting and receiving part (7) (1) so as not to be exposed in the incision part (3).
0) is inserted into the gap surface of the cutout portion (3) at a right angle, and the tip ends are exposed in the cutout portion (3) and face each other in the cross section of the light projecting and receiving portions (7) and (10). A weft yarn sensing device for weft yarn detection of a loom comprising optical cables (8) (11) is disclosed. (Korea Utility Model Announcement No. 9
(See FIGS. 1 to 3 of JP-A-3-5429)

[0004]

The jet water jetted from the water jet nozzle and the splashed water droplets from the warp yarn due to the forward movement of the reed (13) in the direction of the cloth do not directly collide with the incision (3). Fig. 3 discloses the installation of a cover (12) of an iron piece having a bent portion on the side surface on the side of collision of splashed water, but recently, the width of the water jet loom has become wider and the weft thread is fed at high speed. Therefore, it is necessary to increase the pressure and the amount of water jetted from the water jet nozzle, and the flat lower body (1 ') as shown in Korean Utility Model Publication No. 93-5429 is required. In the structure, the weft yarn detection signal rises due to the fluctuation of the water inside the incision part (3) due to the splashed water. Also, when the weft thread swings, it is caught in the bent portion of the folding cover, causing a malfunction, resulting in an idle stop. As an example, when the loom is operated at 1000 rpm, 1,440,000 wefts are fed out in 24 hours.
In order to guarantee an operating rate of 00%, even one idle stop is not allowed, and extremely high accuracy and reliability are required.

An object of the present invention for solving such a problem is to prevent spattered water from directly entering the incision and affecting the weft thread detection signal, and catching the cover even if the weft thread shakes. To prevent it from happening.

A further object is to provide a structure for preventing splashed water splashing on the surface below the cover from entering the light beam passage portion.

[0007]

In order to achieve this object, the weft thread sensing device of the present invention has at least an inclined guide surface having a projecting structure for guiding the splashed water outward and downward on the side surface of the device on the side where the jet water collides. A spray cover is provided below the flat cover by installing a flat cover that covers the weft passing void passage portion including the arc-shaped guide portion outside the side surface of the device on the side where the jet water collides. The side surface of the device on the side where the jet water collides has an inclined surface in the direction in which the splash water is scattered downward, and the position of the light emitter / receiver arranged in the void passage through which the weft thread passes is set from the arc-shaped guide portion. It is supposed to be selected in a far away position.

[0008]

[Function] In order to check whether the weaving weft yarn is delivered as scheduled, the weft yarn passes between the light emitting and receiving devices to detect the weft yarn while the weaving machine moves the weft yarn to the fabric portion. . A weft thread sensing device equipped with a light emitter / receiver is provided with an opening guide portion for guiding the weft thread to a predetermined height from the front side in the weft thread moving direction at a position where the weft thread moves, and an incision section forming a void passage through which the weft thread passes. And a cutout groove that provides a void around where the weft thread reaches the fabric position. The light emitter / receiver is placed almost at a right angle to the surface of the air gap across the air passage.However, even if the sprayed water splashes into the air passage, the effect of blocking the light beam as much as possible does not cause a malfunction. In addition, it is desirable that the position in the incision portion, which is separated from the opening guide portion on the side of the splash water infiltration side, be selected and arranged.

The jetted water is ejected from a water jet nozzle provided on the opposite side of the weft yarn sensing device with the warp yarns therebetween, and the weft yarns pass between the warp yarns, that is, from the water jet nozzle position. Although the weft thread detecting device is arranged at a position closer to the fabric side, that is, the front side, a water jet having a large amount of high-pressure water can reach the weft thread detecting device as direct splash water. Furthermore, the jet water adhering to the warp yarns can be shaken by the basin, and the secondary splashed water can be scattered toward the weft yarn sensing device. That is, the side of the weft yarn sensing device facing the warp yarn is the side on which the jet water, that is, the splashed water collides.

The splash water is primarily attached to the outside of a flat cover which is attached to the side surface of the jet water collision side and covers most of the height of the cutout portion over the entire length from the opening guide portion to the cutout groove. Although water is reflected, some of the water splashed below the cover is reflected and scattered inside the cover. Alternatively, there is water that enters the incision with the weft thread or from another side from the opening guide side. In order to quickly discharge these water, a gap is required between the cover and the weft thread sensing device body, and this gap can be used as a splash water buffer space. When the splashed water collides with the ceiling of the splashed water buffer space, the ceiling is provided with an outward downward slope so that the water droplets can flow outward. This is the inclined guiding surface of the protruding structure. An inclined guiding surface having another protruding configuration is provided on a side surface portion of the weft thread detecting device located below the incision. A projection like an eaves is provided on the lower surface of the cavity for the splashed water that is collided with the side surface and splashes upward, and an inclined guide surface is provided in which the lower surface of the eave is provided with an outward downward inclination. On the side surface of the weft thread detecting device below the eaves, an inclined surface is prepared so that the lower part is separated from the warp thread so that the collision water splashes downward as much as possible.

[0011]

1 is a schematic view of the upper half of a water jet loom, in which 1 is a weft thread sensing device which is the subject of the present invention.
Numeral 13 is a weft shaping agent, 15 is a warp thread, 16 is a yarn for kejikoto which plays a role of a catch cord, 17 is an auxiliary weave used for a catch cord, 18 is a spindle for kejikoto, and 19 is the front of the water jet loom. The frame temple bar, 20 is a yarn kite plate, 21 is scissors, 22 is a water jet nozzle for spraying water, 23 is a weft thread, and 24 is a woven material. 1
3 moves by the movement of a piston driven by a crankshaft connected to a drive motor (not shown) by a V-belt. The weft 23 is sent by the water jetted from the water jet nozzle 22 and passes between the warp yarns.
The weft thread detecting device 1 is provided with a front part, that is, a cloth 24 by the reed 13.
The existence of the weft thread that can be moved toward is checked, and the weft thread 23 is shaped by the scissors 21 in the cloth section 24 immediately after the cloth section is generated.

FIGS. 2 to 4 show a claw 13 and an auxiliary claw 17.
Shows how to move the weft thread forward. The state in which the angle of the crankshaft driven by the electric motor is 260 ° is shown in FIG. 2, the state in which it is 315 ° is shown in FIG. 3, and the state of 360 °, that is, 0 ° is shown in FIG. 2 shows a state in which the weft yarn 23 has been fed out, and FIG. 3 shows that the weft yarn 23 is the weft yarn sensing device 1.
FIG. 4 shows a state in which the weft 23 is inserted into the fabric and the presence of the weft 23 is detected.
It is a state in which the reed 13 reaches the forefront. When the crankshaft further rotates and the crankshaft angle reaches 180 °, the reed 13 reaches the rearmost position.

FIG. 5 is a front view of the weft thread detecting device 1, FIG. 6 is a left side view, FIG. 7 is a right side view, and FIG. 8 is a perspective view. The weft thread pushed by the reed and the auxiliary reed passes through the incision portion 3 which is guided to the arc shape of the component of the opening guide portion 2 on the front side in the front view of FIG. 5 and forms a void passage through which the weft thread passes. , Reaches to the cutout groove 4. The upper and lower gaps of the incision 3 are set to about 1 mm. A vertical hole is provided at a position in the cutout portion 3 near the cutout groove 4 away from the opening guide portion 2, and the light receiver 7 and the projector 10 are arranged in the hole so as to face each other through the cutout portion 3. To do. The electric wires for the light emitters / receivers 10 and 7 and the lead wires are connected to each other and arranged in the electric wire embedding internal space 5, and the lead wires are drawn out from the electric wire drawing port 6 and subjected to synthetic resin molding.

On the right side surface of the lower main body of the weft thread sensing device, there is provided a ceiling 8 which slopes downward to the right toward the outside, that is, a cavity 8 for splashing sprayed water, which has a sloped guide surface for spraying water. In addition, the right end of the lower portion of the incision portion 3 is provided with a spouted water inclination guide surface 9 with a protrusion so that the spouted water of the jet water flows down quickly without entering the incision portion 3. It has been given. A flat cover 12 is attached to the right side surface of the lower body of the weft thread sensing device by means of a screw hole 11 for fixing the cover to prevent the jet water or its splashed water from directly entering the incision 3 and spattered water. The buffer space is defined by the buffer cavity 8 so that the drainage can be smoothly performed. In particular, it is an important point that the inclined guide surface has a downward slope to the right.

The splash water buffer cavity 8 is formed by shaving a 9 mm wide flat material with a depth of 2 mm over the surface extending below the straight line from point A to point B shown in FIG. The cutting edge of the cutting tool is angled so that the ceiling of the cavity 8 is inclined downward to the right toward the outside in the front view.
Then, the flat cover 12 is attached using the fixing screw holes 11 to form a splash water buffer space.

At the right end of the member below the incision 3, FIG.
As shown in Fig. 5, a cutting surface with a depth of about 1 mm is further formed on the curved portion extending from the point C to the point D over the surface extending under the curve extending from the point C to the point D that draws an arc shape. As a result, a spouted water inclination guide surface 9 having a protrusion having a downward slope to the right in the front view is formed. Then, this cutting surface is cut deeper toward the lower part so that it becomes an inclined side surface 25 that descends to the left rather than being vertical in the front view.

FIG. 9 illustrates the behavior when splashed water, that is, jet water or water droplets comes in. When the water splashes from the outside of the weft thread sensing device in the direction of the arrow, it splashes on the surface of the flat cover 12 in the direction having the vertical component as shown in the figure.

It is expected that the amount of splashed water flying to the vertical surface of the protruding portion of the member below the incision 3 will be very small because the area is relatively narrow, but the direction of splashing will be the cover 12.
Will be similar to the surface of. Although the splashed water having the upward component enters the splashed water buffer space, it does not fall along the back surface of the cover 12 and affect the incision 3. Since the collision surface of the splashed water flying below the protruding portion is not vertical but has a slope in the direction of scattering downward, most of it falls naturally along the surface and does not affect the incision 3.

As a result, the performance of the weft thread sensing device is improved, malfunctions are reduced, and maintenance work is reduced by using an optical sensor having a semi-permanent life, so that maintenance parts cost and labor cost can be reduced. The production rate has been increased by improving the operating rate of the water jet loom, and the reduction of the fabric defect rate due to the reduction of duplicate weft threading due to the omission of weft thread detection reduces the maintenance cost and significantly reduces the production cost. Cost reduction is achieved.

[0020]

EFFECTS OF THE INVENTION By preventing the sprayed water from the water jet nozzle or the water drops from the surroundings including the warp and weft and the cloth from entering the incision by the splashed water inclined guide surface and the splashed water buffer space, the opening By arranging a light emitting and receiving device for projecting and receiving light through the incision part at a position of the incision part far from the guide part and close to the cutout groove, so as to avoid the influence of the water drops penetrating the incision part as much as possible, It is possible to start a signal by using a true weft thread, which makes it possible to prevent the weft thread from being overlooked and the weaving machine from stopping idle.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an outline of an upper half portion of a water jet loom.

FIG. 2 is a related explanatory diagram between the reed, the weft yarn, and the weft yarn sensing device, showing a state in which the weft yarn is delivered by a water jet.

FIG. 3 is a related explanatory diagram between the reed, the weft thread, and the weft thread sensing device, showing a state in which the weft thread is detected by inserting the weft thread into the weft thread sensing device.

FIG. 4 is a related explanatory diagram between the reed, the weft thread, and the weft thread sensing device, showing a state in which the weft thread reaches the fabric position and is in the most advanced position.

FIG. 5 is a front view of a weft thread sensing device.

FIG. 6 is a left side view of the weft thread sensing device.

FIG. 7 is a right side view of the weft thread sensing device.

FIG. 8 is a perspective view of the weft thread detecting device in a state similar to that of FIG.

FIG. 9 is an explanatory diagram for explaining the behavior of scattered water, that is, the behavior of jetted water or water drops coming from outside.

[Explanation of symbols]

 1 Weft Thread Sensing Device 2 Opening Guide Section 3 Incision Section 4 Cutout Groove 7 Light Receiver 8 Splash Water Cushion Cavity 9 Splash Water Inclination Guide Surface 10 Emitter 11 Cover Fixing Screw Hole 12 Cover 22 Water Jet Nozzle 23 Weft Thread 25 Slope Side

Claims (4)

[Claims] 1. In a weft yarn sensing device of a water jet loom, which is provided with a light emitter / receiver which is arranged substantially at right angles to a void passage through which the weft yarn passes, the weft yarn sensing device is scattered on the side surface of the device on the side where the jet water collides. A weft thread sensing device for a water jet loom comprising at least one inclined guiding surface configured to project water outwardly and downwardly. 2. A plane cover for covering the weft thread passage portion including an arcuate guide portion is attached to the outside of the side surface of the apparatus on the side where the jet water collides, and a splash water buffer space provided by the cover is provided. The weft sensing device for a water jet loom according to claim 1, 3. The water according to claim 2, wherein a side surface of the device, which is located below the plane cover and on which the jet water collides, has an inclination in a direction in which the collision splash water is scattered downward. Weft sensing device for jet loom. 4. The arrangement position of the light-emitter / receiver in the cavity is selected at a position far from the arc guide and close to a cutout groove arranged on the opposite side of the arc guide across the cavity. The weft yarn sensing device for a water jet loom according to any one of claims 1 to 3,