JP3071542B2 - Thread break detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting breakage of a large number of sheet-like warp yarns.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication Nos. 50-25860, 51-35759 and 50-25861.
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses that each sheet-like warp yarn is detected, and when the total number thereof is equal to or less than a set value, it is determined that a yarn break has occurred. The first two of these publications are:
It is a so-called fixed system in which the sensor does not move in the warp yarn width direction, and a later publication is a so-called moving system in which the sensor moves in the warp yarn direction.

When the sheet width of the warp yarn is increased, the above-mentioned prior art has the following problems. First, in the case of the fixed system,
The warp in the end region far from the sensor could not be accurately detected, and the number of yarns could not be counted accurately. This is because, when viewed from the sensor, the warp yarns at the far end are overlapped and the pitch of the warp yarns is narrow.

Further, in the case of the moving system, it takes a long time to move, and it is not possible to detect the yarn breakage early. There were serious drawbacks, such as being caught in the beam. In the case of the fixed system, the same problem arises because the scanning time is long.

To solve these problems, it is conceivable to divide the warp monitoring area in the width direction of the warp sheet and provide a sensor for each monitoring area. At this time,
The following new issues are raised. In other words, the boundary of the monitoring area of the sensor fluctuates due to the warp of the warp yarn and the vibration of the sensor, causing an error in the count value of the number of warp yarns. Was impossible.

[0006]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to narrow the monitoring area when detecting warp yarns, to increase the accuracy in the detection process, and to shorten the detection time.

[0007]

According to the above object, the present invention provides a sheet
Splits a large number of warp yarns into multiple groups
An identification unit is provided at the boundary position of each group of
The identifier and warp ends in-loop photoelectrically detected by a plurality of warp yarns detectors to generate electrical detection signals by a signal processing unit, the detection signal identification signal
Calculate the warp yarn waveform between
When the total is less than the regular total number of yarns,
I try to judge.

[0008]

FIG. 1 shows the structure of a yarn breakage detecting device 1 according to the present invention. The warp yarn 2 to be detected passes through the reed 3 on one plane, is in the form of a sheet, and is photoelectrically detected by a plurality of warp detectors 4. The warp detector 4 is composed of a plurality of fixed image sensors that do not move in the sheet width direction of the warp yarn 2 or one or two of the moving method.
The warp detector 4 is composed of the light emitting and receiving sensors described above.
Detection signal as the output of the is fed to the processing unit 6 such as a computer through a signal converter 5. The processing unit 6 has a built-in program necessary for signal processing, and is connected to the memory 7, the display unit 8, the input unit 9, and the like.

FIG . 2 shows an example of a thread breakage detection program. At the start of yarn break detection, the number of yarns is set in advance by the input unit 9 and stored in a predetermined address of the memory 7. This number of yarns is given as a regular total number of yarns of the sheet-like warp yarn 2. Next, the warp thread detector 4, each group as a monitoring area, and detects the warp 2 photoelectrically generates a detection signal and sends the signal converter 5. Detection signal, for example, as a high-level signal at the location of the warp 2, also appears as a low-level signal in the absence position of the warp 2. Signal converter 5, a detection signal waveform shaping, by binarizing, into a rectangular waveform signal, and outputs to the processing unit 6. Here, the “H” level waveform in the form of a rectangular wave corresponds to the warp yarn waveform indicating the presence of the warp yarn 2.

[0010] Therefore, the processing unit 6, at a predetermined sampling period, captures the detection signal after waveform shaping, after temporarily stored in the memory 7, the warp waveform example thresholding from the detection signal By taking out and counting the number, the number of the warp yarns 2 in the area detected by the warp yarn detector 4 is integrated, and then the number of yarns from the yarn detector 4 of each group is totaled. And all groups of yarn
Comparing the total sum and the total yarn number of regular number, but they are determined to no yarn breakage when same as <br/>, total count yarn number
When the total is less than the previously entered normal number of yarns, it is determined that there is a yarn breakage, a warning signal for yarn breakage is generated, and the normal yarn set in advance in the display unit 8 is set. The number of yarns, the total number of yarns after counting, and the number of yarn breaks are displayed.
Show. Therefore, the worker checks the number of thread breaks, performs necessary thread break processing, and then returns the processing unit 6 to the original state.

FIG . 3 shows that a large number of sheet-like warp yarns 2 are divided into a plurality of groups, and an identification unit 1 is provided at a boundary portion of each group.
In this example, the monitoring area of the warp detector 4 including the identification units 12 at both ends is set. As a result, the monitoring area is set as an overlapping state in adjacent groups.

FIG . 3A shows an identification unit 12 for each group.
3B is an example in which the warp yarn detector 4 serving also as the detecting means is disposed, and FIG.
3C shows an example in which two warp detectors 4 commonly use two monitoring areas . FIG. 3C shows a state in which one warp detector 4 serving also as a detecting unit of the identification unit 12 moves the warp yarns 2 in four groups. This is an example of sequential detection, and FIG.
Is an example in which a warp detector 4 such as a photoelectric sensor also serving as a detecting means of the identification unit 12 is provided for each group of the warp yarns 2 and is detected by moving the warp yarns 2 in the sheet width direction. Here, as shown in FIG.
It is configured as a laser light source or a reflection plate facing the space between the warp yarns 2 at the boundary position of the group .

[0013] warp detector 4 consisting of an image sensor or photoelectric sensor, for each group, and detects the warp 2 and the identification unit 12 photoelectrically generates a detection signal containing both. Detection signal includes a monitoring region comprises a signal corresponding to the identification portion 12 at both ends of the warp waveform further corresponding to the presence or absence of warp threads 2 between both the identification section 12. Here, the signal waveform of the identification signal corresponding to the identification unit 12 and the warp waveform corresponding to the warp yarn 2 can be determined based on the level of the signal level.

Therefore, the identification unit detecting means provided in the processing unit 6 detects a high-level signal in comparison with the warp waveform by appropriate threshold processing, and identifies the signal at the identification unit 12 corresponding to the identification signal. Output as a signal . others
For this reason, the processing unit 6 detects the number of warp waveforms between the identification signals corresponding to the identification units 12 at both ends of the detection signals . By this signal processing , the number of the warp yarns 2 in each group can be counted.

[0015] In the case of detection signal from the image sensor, across from one of the scanning signal identifying section 12
Except identification signal corresponding to, by counting the remaining warp waveform, but may be counted in the number of warp threads 2,
The detection signal in the case of the photoelectric sensor, the first identification section 1
If the existence of the identification signal corresponding to No. 2 is confirmed, the counting of the warp waveform of the “H” level is started thereafter, and the counting is stopped after confirming the existence of the identification signal corresponding to the next identification unit 12. The count value at that time is the warp yarn 2 of the group.
It corresponds to the number.

The identification section 12 may have another configuration instead of a laser light source, a reflector, or the like. For example, glue
At the boundary position of the flop by setting the larger intervals than the warp pitch other conventional warp pitch, no air
The identification unit 12 can be configured by the interval . In this case, the identification unit detecting means, the spacing of the "H" level of the signal waveform of the detection signal was measured, to determine the location of the greater spacing than the spacing of the normal warp waveform is an identification unit 12, the identification signal Can be output. If a warp break occurs, the identification unit detection means outputs an identification signal also at that location. That is, when a warp break occurs, the warp yarn 2 disappears from the monitoring area at that portion, and the warp yarn pitch on both sides sandwiching the warp yarn 2 increases. Therefore, the number of warp yarn waveforms between the identification signals is detected, and when the number is smaller than the number of yarns input in advance, it can be determined that there is a yarn breakage.

Further, the identification section 12 may be formed of a color yarn different in color from the normal warp yarn 2 . That is, when creating a thread sheet, a colored thread may be inserted in advance and used as the identification unit 12. In this case, the warp yarn detector 4 needs to be a sensor that can identify the color yarn as the identification unit 12.

[0018]

In the present invention, is divided into a plurality of multiple sheet warp in the width direction on the plane, their guru
Because there are identification unit for boundary identification between-loop, detecting the number of the warp yarns is Ru done in groups. Therefore, only the warp waveform of each group is easy from the output of the warp detector.
To retrieve, limitations and magnification on the field, there is no limitation on the decomposition performance, it can be reliably performed counting the number of the warp yarns. In addition , since a plurality of warp detectors are provided , the detection time can be shortened by that amount, so that quick detection is possible.

[Brief description of the drawings]

FIG. 1 is a block line section of a yarn breakage detecting device.

FIG. 2 is a flowchart of a detection program.

FIG. 3 is another explanatory view of a warp yarn grouping state.

FIG. 4 is a plan view of an example in which an identification unit is set between warp groups;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread breakage detection device 2 Warp yarn 3 Reed 4 Warp detector 5 Signal converter 6 Processing unit 7 Memory 8 Display unit 9 Input unit 11 Spacer 12 Identification part

Claims (1)

(57) [Claims] 1. A large number of warp yarns divided into a plurality of groups in a width direction in a state of being parallel on a plane, an identification portion provided at a boundary portion between the divided groups, and identification of both ends in each group. A plurality of warp detectors that photoelectrically detect each warp yarn to generate an electrical detection signal by using the warp yarn as a monitoring area between the warp portion and the two identification portions, and a detection signal of each warp yarn detector.
Signal and the identification signal corresponding to the identification unit
The number of warp yarns in the group is counted by counting the warp waveforms corresponding to the warp yarns between the identification signals , and the number of the warp yarns in each group is counted.
A yarn breakage detecting device , comprising: a processing unit that determines that a yarn breakage has occurred and outputs a yarn breakage signal when the total number of the yarns is smaller than the normal total number of yarns.