JPH04241149A - Device of detecting weft of weaving machine - Google Patents

Abstract

PURPOSE:To provide a weft detector of discovering arrival of weft by a single sensor and recognizing joint and to simplify the device. CONSTITUTION:An image sensor 14 of scanning a cross-sectional part along extending direction of weft flying course is provided and a half mirror 50 is arranged between the weft flying course and the image sensor 14. The image sensor 14 is set toward a weft guide groove 8 before a reed 2 at the side of opposite weft inserting. The image sensor 14 scans a cross section of the extending direction of the weft guide groove by a driving circuit, namely, vertically part of the weft guide groove 8 of the dent 7 in front view of the weaving machine. An image signal by the image sensor 14 is inputted to a signal treating circuit not shown by a figure, the image signal thereof is taken out as different voltage signals when the weft is detected and is not detected and detection of the weft is judged based on the voltage signals.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detection device for a loom which detects arrival of a weft to the side opposite to the weft insertion side and detects body breakage.

0002

[Prior Art] Conventionally, an air injection loom has a weft guide groove on the front surface of the reed, and has a main nozzle arranged on the weft insertion side and auxiliary nozzles arranged at predetermined intervals along the weft guide groove. Weft insertion is performed by In such air injection looms, it is necessary to detect when the weft reaches the side opposite to the weft insertion side, and to detect so-called body breakage, in which the weft yarn is inserted and breaks midway while flying within the warp row. A weft detection device is known (Japanese Patent Laid-Open No. 63-27575).
(See Publication No. 5).

[0003] As such a weft detection device, there is one shown in FIGS. 9 and 10, for example. As shown in FIG. 9, two sensors A and B each having a sensor body 62 made of a prism incorporating a light emitting diode 60 and a light receiving diode 61 are prepared, and as shown in FIG. One sensor A is inserted between the reed blades from the rear side of the reed 63, and the other sensor B is inserted from the rear side of the reed 63 at a position a predetermined distance downstream in the weft insertion direction from the insertion position of one sensor A. Insert between the reed feathers.

Each of the sensors A and B detects the presence or absence of a weft yarn based on a change in the amount of light received when the light from the light emitting diode 60 is blocked by the weft yarn and enters the light receiving diode 61.
As shown in (a), when both sensors A and B detect that there is no weft, it is determined that the weft has not reached the opposite side of the weft insertion (short pick), and as shown in (b) When both sensors A and B detect the presence of a weft thread, it is determined that the weft thread is broken, and when sensor A detects the presence of a thread and sensor B detects no thread, it is normal. It is determined that the weft insertion state is correct.

[0005] The prism constituting the sensor main body 62 allows light to travel across a wide range of cross-sections in the extending direction of the weft thread path formed by the weft thread guide grooves 64, so that it is possible to determine where the weft yarn is on the weft thread path. Also, the presence or absence of weft threads can be detected.

[0006]

[Problems to be Solved by the Invention] However, in such a conventional weft yarn detection device, it is necessary to prepare two sensors, which makes the device complicated. Furthermore, when changing machines, it is necessary to separately adjust the positions of the two sensors depending on the yarn type and fabric, which is time-consuming. Moreover, since each sensor is attached to the reed 63, each sensor must be attached and detached when replacing the machine, which requires troublesome work, and the position of each sensor must be adjusted each time it is attached or detached. Therefore, it requires a lot of effort.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides a weft yarn detection device capable of detecting arrival of the weft yarn and detecting body breakage using a single sensor. The purpose is to simplify, etc.

[0008]

[Means for Solving the Problems] Therefore, the weft detection device for a loom of the present invention is a weft detection device for a loom that detects arrival of the weft to the side opposite to the weft insertion side and detects body breakage. ,
The structure includes a sensor that performs sensing toward the weft flying path in front of the reed, and a half mirror disposed between the weft flying path and the sensor, and It passes through the half mirror from the first sensing section and enters the sensor, and is reflected by the half mirror from the second sensing section on the weft flight path located at a position apart from the first sensing section. The orientation of the sensor and half mirror with respect to the weft flight path was set so that the light was incident on the sensor.

[0009]

[Operation] With this configuration, both a short pick and a cut-off can be detected with a single sensor, so the detection device can be simplified. Furthermore, when the cloth is changed, a simple operation such as adjusting the position of the half mirror or sensor is sufficient.

Furthermore, there is no need to attach or detach the sensor when changing the machine, and no troublesome work is required at all.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 and 2 show an embodiment in which the weft detecting device of the present invention is applied to an air injection type loom. In this figure, 1 is a warp, 2 is a reed, 3 is a weft, and 4 is a woven fabric.

The reed 2 is fixed by pushing a wedge 6 into a groove 5a of a reed holder 5, which swings its lower frame 2a back and forth. The reed feathers 7 have a chevron shape that is convex toward the front when viewed from the side, and have a concave portion at the top. A weft guide groove 8 is formed on the front surface of the reed 2 by the row of concave portions of the reed feathers 7. A weft flying path is formed by this weft thread guide groove 8, and the weft threads fly along this weft flying path.

Auxiliary nozzles 9 are fixed by bolts 11 whose heads are inserted into T-shaped grooves 10 on the front surface of the reed holder 5, and are arranged at predetermined intervals along the weft guide grooves 8. ,
Air is ejected obliquely toward the weft guide groove 8. In such a loom, weft threads 3 are injected into openings of warp threads 1 opened by healds (not shown) during weft insertion by air jets from a main nozzle (not shown). The weft yarn 3 is blown away by air ejected from auxiliary nozzles 9 arranged at predetermined intervals along the weft guide groove 8, and travels along the weft guide groove 8. Then, when the tip end of the weft yarn 3 passes through the first sensing section S1 shown in FIG. 2 and reaches the opening of the weft end capture yarn S, weft insertion is completed.
Thereafter, the weft yarns 3 are reeded onto a cloth front by a reed 2 and woven into a woven fabric 4.

The woven fabric 4 advances while being subjected to tension from both ends by temples 13 attached to a top stay 12 attached to the frame. In such an air-injection type loom, a single image sensor 14 is provided as a sensor according to the present invention for scanning a cross-sectional portion along the extending direction of the weft thread flight path, and the image sensor 14 scans the cross section along the extending direction of the weft thread flight path. Half mirror 5 between
0 is placed.

The image sensor 14 is disposed in front of the reed 2 on the side opposite to weft insertion, facing toward the weft guide groove 8. In this case, the main body of the image sensor 14 is fixedly attached to the top stay 12 via the attachment stay 15. That is, approximately L is located near the temple 13 mounting portion of the top stay 12.
One end of the letter-shaped mounting stay 15 is fixedly attached. The other end of the attachment stay 15 extends toward the weft insertion side, and a rectangular image sensor 14 body is fixedly attached to the upper surface of this other end.

[0016] Here, the image sensor 14 includes, for example,
Consists of a MOS type or CCD type solid-state image sensor,
Depending on the arrangement shape of the photoelectric conversion elements, one-dimensional arrangement type (line sensor), two-dimensional arrangement type (area sensor), etc. are used. The image sensor 14 is installed so that a lens captures the weft guide groove 8 as a measurement target part, and an optical image is formed on the sensor part.

The image sensor 14 is operated by a drive circuit (not shown) to detect a cross section in the direction in which the weft guide groove extends, that is,
The weft guide groove 8 portion of the reed blade 7 is scanned up and down when viewed from the front of the loom. And image sensor 14
The video signal is input to a signal processing circuit (not shown). This video signal is extracted as a voltage signal that differs when no weft is detected and when a weft is detected (see FIG. 5), and it is determined based on this voltage signal that the weft has been detected.

The image processing method of the image sensor 14 will now be described with reference to FIGS. 4 and 5. (Although this embodiment will be explained as a circuit, it is not limited to this, and the same processing can also be performed by executing a computer program.) 14 shown in FIG. 3 is a one-dimensional CCD (Character).
ge Coupled Device) image camera. This image camera 14 has an EXT (external synchronous scanning) mode in which scanning is performed only once by inputting a scanning signal from the outside into the camera body, and an INT mode in which scanning is performed continuously by automatically generating a scanning signal within the camera. (internal automatic scanning) mode, and in this example, the INT mode is selected. 111 is a binarization circuit that inputs the video signal from the image camera 14;
1a is a scanning image position counter circuit which inputs a slice video signal from the binarization circuit 111, and further inputs a video clock signal and a scanning clock signal from the image camera 14. 101b subtracts arbitrary constants c (L1-c) and (M1-c) from the rising positions L1 and M1 of the slice video signal input to the scanning image position counter circuit 101a, respectively, and obtains an arbitrary constant d.
A generation circuit 101c outputs a signal obtained by adding (L1+d) and (M1+d), and the rising width W1 of the slice video signal input to the scanning image position counter circuit 101a is such that a<W1<b, for arbitrary constants a and b. a
This is a comparison circuit that determines whether <X1<b.

Reference numeral 102a denotes a binary counter circuit, in which the data of the scanning image position counter circuit 101a from the previous scanning is shifted as is by the scanning clock signal. Further, 102b is a signal input from the binary counter circuit 102a and the generation circuit 1.
Input the signal from 01b and (L1-c)<L2<(L
1+d), (M1-c)<M2<(M1+d). Here, L2 and M2 are the rising positions of the slice video signal of the binary counter circuit 102a, which correspond to the rising positions of the slice video signal of the scanning image position counter circuit 101a when scanning was performed last time.

[0020] Furthermore, the binary counter circuit 102a (L
2-c), (L2+d) and (M2-c), (M2+d
) generation circuit 102b is connected thereto, and further connected to a two-division scanning clock signal generation circuit 112. The two-division scanning clock signal generation circuit 112 receives the scanning clock signal from the image camera 14, divides it into two scans, and outputs the divided scan clock signal. 102c is a binary counter circuit 102a
A comparison circuit that determines whether rising widths W2 and X2 of slice video signals satisfy a<W2<b and a<X2<b, respectively. Note that W2 and X2 correspond to the rise width of the slice video signal of the scanning image position counter circuit 101a when scanning was performed last time.

The binary counter circuit 103a is constructed in the same manner as the binary counter circuit 102a described above, and the data of the binary counter circuit 102a at the time of previous scanning is shifted as is by the scanning clock signal. That is, this also corresponds to the data of the scanning image position counter circuit 101a when the previous scanning was performed. Moreover, binary counter circuits 103a, 104
a, comparison circuits 103b, 103c, 104b, 104c
, the generation circuit 103d, etc. are similar to the binary counter circuit 102a, etc., and have the configuration shown in FIG. 4.

Comparison circuits 102b, 103b, 104, respectively
b, 104c, a signal is input to the weft insertion defect determination circuit;
The first sensing section S1 and the second sensing section S2
It is determined whether there is a short pick, body breakage, or normality based on the presence or absence of weft threads. Next, its effect will be explained. First, as shown in FIG. 5, a scanning clock signal divided into two times in one scanning operation is output, but when the first scanning clock signal is output, the image camera 14 scans and images an image. The signal is input and binarized by the binarization circuit 111, and a slice video signal as shown in FIG. 5 is output.

This slice video signal is input to the scanning image position counter circuit 101a, and since the video clock signal of a predetermined pulse is also input at the same time, the first
The rising position L1 and rising width W1 of the slice video signal are pulse counted. In addition, when the second scanning clock signal is continuously output, if a cutoff has occurred, the rising position of the second slice video signal is changed in the same way as when the first scanning clock signal was transmitted. M1 and rising width X1 are pulse counted.

Therefore, in the generation circuit 101b, the first,
Rising positions L1, M1 of the second slice video signal
In order to determine the range of the position where the weft should be present at the next time of scanning, arbitrary constants c and d are set based on
), (M1-c), and (M1+d) are generated and output to the comparison circuit 102b. Next, in the comparison circuit 101c, the first
, rising width W1, X1 of the second slice video signal
It is determined whether or not the weft is projected by checking whether or not they are in the ranges of (a<W1<b) and (a<X1<b), respectively.

Also, during this scanning, each counter circuit 101 is
A first signal is output to a to 104a, the first data is shifted from the counter circuit one before each of the counter circuits, and then a second signal is output, and the second data is shifted in the same way as above. Each counter circuit is shifted from the previous counter circuit. That is, the data of the counter circuit 101a when scanning was performed last time is shifted to the counter circuit 102a, and the data is also transferred from the counter circuit 102a to the counter circuit 103.
a, and from the counter circuit 103a to the counter circuit 10
Shifted to 4a. Then, the data in the counter circuit 104a is erased. In the binary counter circuit 102a, the data of the previous counter circuit 101a is shifted as described above, but at this time, the rise position of the slice video signal is set as L2, M2, the rise width is set as W2, X2, and the data is shifted in the comparator circuit 102b. (L1-c)<L2<(
By determining L1+d), (M1-c)<M2<(M1+d), it is determined whether or not the signal rise position has continuously come near the weft position during the previous scanning. Also, at the same time, in the generation circuit (L2-c), (L2+d)
, (M2+d), (M2-d), and comparator circuit 1
03b. Then, in the comparison circuit, the rise widths W2 and X2 of the slice video signal are determined (a<W2<
b), (a<X2<b), it is determined whether or not the respective wefts are projected.

As described above, the first
The sensing part S1 and the second sensing part S2 check whether or not weft threads are continuously present to reliably determine whether it is noise or not, and accurately determine whether it is a short pick, a cut in the body, or normality. . It is preferable to use a fluorescent light source, a halogen lamp light source, or a gas laser light source as the illumination means.

Therefore, in this embodiment, a spot lamp 16 as an illuminator for irradiating light toward the weft guide groove 8 is attached to the upper surface of the image sensor 14 main body. The light from the spot lamp 16 is reflected by the reed 7 and input to the image sensor 14, but if there is a weft 3, the light will be blocked at that part. Alternatively, as shown in FIGS. 8(a) and 8(b), an optical fiber is buried in the reed 7 without using the spot lamp 16, and the light from the light source 61 is transmitted through the weft guide groove 8 to the image sensor 14. It is also possible to project light.

Furthermore, as shown in FIG. 5, the image sensor 1
It is preferable to attach a hood 17 to the lens surface of No. 4 to prevent the adhesion of fluff. In this case, it is more effective to introduce purge air into the hood 17 through the pipe 18 to blow away the fluff. On the other hand, the half mirror 50 is attached to the top stay 12 via a drive device that will be described later.

[0029] Here, the first imaging unit as the first sensing unit in the weft flying path passes through the half mirror 50 and enters the image sensor 14, and is separated from the first imaging unit. The image sensor 1
4 and the direction of the half mirror 50 with respect to the weft flying path is set.

This will be explained based on FIG. 2. The weft flying path is line L, S1 on line L is the first sensing part, and S2
is the second sensing part, which is at a predetermined angle θ from S1 to line L.
The orientation of the image sensor 14 is set so that the optical axis of the image sensor 14 coincides with a line L1 extending at a distance of 1. Further, the half mirror 50 is placed on the line L1 and extends from S2 at a predetermined angle θ2 (=θ1) with the line L, and the half mirror 50 is placed on the line L1 from S2.
The axis of the light incident on and reflected by the image sensor 14
The orientation of the half mirror 50 is set so that it coincides with the optical axis of.

[0031] In this case, S1 and S2 depend on the yarn type and woven fabric.
The half mirror 50
along the optical axis of the image sensor 14 to a position indicated by a dotted line in the figure. By this movement of the half mirror 50, S2 changes to the position S2', for example. When the half mirror 50 is moved along the optical axis of the image sensor 14 in this way, the optical axis distances between S1 and S2 and the image sensor 14 are always equal and constant, and the focal position of the image sensor 14 can be kept constant. , there is no need to adjust the focus.

Furthermore, the relationship between the mirror surface of the half mirror 50 and the sensor surface of the image sensor 14 is set as follows. That is, in FIG. 3, the mirror surface of the half mirror 50 is inclined by θ3 with respect to the upright line l (line l2). Then, an image Z1 which passes through the half mirror 50 from S1 and enters the sensor section 14a, and an image Z1 which passes through the half mirror 50 from S2 and enters the half mirror 50 from S2.
Images Z2 that are incident on the sensor portion 14a and reflected thereon can be formed at different positions on the sensor portion 14a,
Weft detection at the S1 position and the S2 position can be performed completely independently.

The relationship between the voltage signal waveform taken out from the image sensor 14 and the detection points S1 and S2 in this case is as shown in FIG. Here, the drive device for the half mirror 50 is
As shown in FIG. 3, threaded cylinders 52 having internal threads formed on the inner peripheral surface are fixed to two locations on the lower surface of the plate member 51 attached to the half mirror 50, respectively. A tip of a threaded rod 53 having a threaded portion formed on its outer peripheral surface is fitted into each threaded cylinder 52 . A gear 54 is fixedly attached to the rear end of this threaded rod 53, and the gears 54 mesh with each other. A gear 56 rotated by a motor 55 is meshed with one gear 54.

Therefore, when the motor 55 is driven to rotate the gear 56, the gear 54 rotates, the threaded rod 53 rotates, the screw fitting position with the threaded cylinder 52 changes, and the half mirror 50 moves. However, as described above, the half mirror 50 can be moved along the optical axis of the image sensor 14. According to this configuration, a single image sensor 14 is used as a sensor.
When the weft arrives at the side opposite to the weft insertion side, the body breakage can be detected, and the detection device can be simplified.

Furthermore, if the yarn type changes, it can be dealt with simply by adjusting the position of the half mirror 50, so it does not take much time to set up. Moreover, the image sensor 14
is disposed in front of the reed 2 facing the weft guide groove 8, so there is no need to attach or detach the main body of the sensor 14 when changing the machine, and no troublesome work is required at all.

Furthermore, since the image sensor 14 scans the cross section of the weft flight path, that is, the weft guide groove 8 portion of the reed blade 7 up and down, there is no need for a large detection range, and high detection accuracy can be achieved. and the sampling time is short. In particular, by using a one-dimensional arrangement type (line sensor), two-dimensional arrangement type (area sensor), etc. as the image sensor 14, it is possible to obtain a weft yarn detection device with higher detection accuracy.

As described above, the hood 17 is attached to the lens surface of the image sensor 14 to prevent the adhesion of fluff.
0 may be included. This embodiment is shown in FIG. 6, in which an inner cylinder 57 to which a half mirror 50 is attached is slidably disposed within a hood 17. A long sliding groove 17a extending along the optical axis direction of the image sensor 14 is formed in the peripheral wall of the hood 17, and a sliding shaft 57a provided upright on the peripheral wall of the inner cylinder 57 is inserted into the long groove 17a. A knob 57b is provided at the end of the shaft 57a, and the inner cylinder 57 is slid by operating the knob 57b.

Therefore, as mentioned above, the half mirror 5
0 can be moved along the optical axis of the image sensor 14. In this case, as described above, if the purge air is introduced into the hood 17 through the pipe 18, it is possible to blow away the fluff that tries to adhere to the half mirror 50, and the purge air is supplied exclusively for the half mirror. There is no need to provide a separate means.

Next, FIG. 7 shows an embodiment in which the weft detecting device of the present invention is applied to a water jet type loom. That is, in this figure, the warp yarns 20 are opened and closed by the healds 22 after passing through the back roller 21, and the weft yarns 24 are inserted into the opening together with water jetted from the weft insertion nozzle 23.
This is driven into the fabric front by the reed 25, and a woven fabric 27 is woven.

Thereafter, the woven fabric 27 passes through a suction tube 28 as a dewatering device and is pulled by a weaving density adjusting mechanism 29. Then, it is wound around the cross roller 30. The suction cylinder 28 has a slit 28a on the circumferential surface of the area around which the woven fabric 27 is wound, and the inside thereof is connected to the suction port of the blower 33 via a gas-liquid separator 31 via a pipe 32. Therefore, the moisture contained in the woven fabric 27 is removed by suction here.

[0041] In such a water jet loom,
The image sensor 34 is located in front of the reed 25 on the side opposite to the weft insertion side, and is disposed facing the weft flying path. in this case,
The main body of the image sensor 34 is fixedly attached to the suction tube 28 by attachment means such as a bracket 35 . Additionally, water jet looms are generally provided with a cover 44 that can be opened and closed freely as shown in Fig. 7 to prevent water from scattering during weaving.In this case, the cover 44 has an opening 4.
4a, and the image sensor 34 is inserted through this opening 44a.
The lens portion may be made to face the weft flight path as the measurement target portion.

[0042] Here, in air injection looms, those in which a weft guide groove is formed on the front surface of the reed or those in which an air guide is provided separately from the reed are such that the cross section of the weft thread flying path is However, since there is no member to guide the weft in a water jet loom, the path along which the weft travels is investigated in advance, and the image sensor 34 is installed so that the cross section of that path is scanned. .

The half mirror 36 is attached to the suction tube 28 via the same drive device as in the previous embodiment. In this embodiment as well, the image sensor 34 is scanned by a drive circuit (not shown) in a substantially vertical direction perpendicular to the direction in which the weft flying path extends, and the video signal from the image sensor 34 is input to a signal processing circuit (not shown). Ru.

When the image sensor 34 is applied to such a water jet loom, since water is present along with the weft in the weft flight path, by scanning the same spot multiple times, the shape of the water is different between the first and second scans. However, since the weft is a string-like yarn extending from the weft insertion side to the opposite weft insertion side, the width is approximately concentric between the first and second scans, and the position is continuous for each scan.

Particularly in this case, since it is possible to detect the state in which the weft yarn is flying, distinguishing it from water, the exact arrival time of the weft yarn can be determined. In the above embodiments, an image sensor is used as the sensor of the present invention, but a sensor including a light projector and a light receiver including a light projector and a light receiver may be used.

[0046]

As explained above, according to the weft yarn detection device of the present invention, there is a sensor that senses the weft yarn flight path in front of the reed, and a sensor that is disposed between the weft yarn flight path and the sensor. a half mirror provided therein, the second half mirror passes through the half mirror from the first sensing section in the weft flight path and enters the sensor, and the second half mirror is spaced apart from the first sensing section. Since the weft is reflected from the sensing portion by the half mirror and is incident on the sensor to detect the arrival of the weft and to detect the cut of the body, the configuration of the detection device can be simplified. Even if the yarn type changes, it is easy to deal with the change in setup without any hassle.
In addition, it is very useful because it is convenient for work, such as not requiring the sensor body to be attached or detached when changing equipment.

[Brief explanation of the drawing]

[Fig. 1] A perspective view showing an embodiment of a weft detection device for a loom according to the present invention.

[Figure 2] Plan view of main parts in Figure 1

[Figure 3] Schematic diagram illustrating the arrangement of the image sensor and half mirror in the above embodiment.

[Figure 4] Block explanatory diagram explaining the image processing method of the image sensor

[Figure 5] Diagram showing the relationship between the output voltage characteristics of the image sensor and the weft detection point

[Figure 6] Perspective view of another embodiment

[Figure 7] Perspective view of another embodiment

[Figure 8] Side view and front view of yet another embodiment

[Figure 9
] Perspective view illustrating a conventional detection device

[Figure 10]
A perspective view illustrating a conventional detection device

[Figure 11] Schematic diagram showing a conventional weft detection method

[Explanation of symbols]

1 Weft 8 Weft guide groove 14 Image sensor 24 Weft 34 Image sensor 36 Half mirror 50 Half mirror

Claims (1)

[Claims] [Claim 1] A weft detection device for a loom that detects arrival of the weft to the side opposite to the weft insertion side and detects body breakage, the sensor sensing toward the weft flight path in front of the reed. and a half mirror disposed between the weft yarn flying path and the sensor, and a first sensing portion in the weft yarn flying path passes through the half mirror and reaches the sensor. The weft flight path of the sensor and the half mirror is such that the weft yarn travel path enters the sensor and is reflected by the half mirror from the second sensing section of the weft flight path located at a position spaced apart from the first sensing section, and then enters the sensor. A weft detection device for a loom, characterized in that the direction of the weft thread is set relative to the direction of the weft thread.