JP2796857B2 - Unwinding yarn sensor device for yarn supply - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a yarn sensor for detecting a switching state and a yarn break state of a yarn feeder in a process of unwinding a yarn from a plurality of yarn feeders. Related to the device.

[Conventional technology]

In order to save labor in a woven fabric factory, when a yarn break occurs between the yarn feeder and the length measuring and storing device as in the inventions of JP-A-61-47849 and JP-A-63-264949, Devices have been used that automatically pull out yarn from new yarn feeders. When using such an automatic yarn feeding device, at the time of yarn breakage, in order to specify a yarn feeder to be pulled out next,
It is necessary to determine the yarn feeder in the broken state.

In view of the above, the applicant filed an invention of a "thread unwinding yarn sensor" of Japanese Patent Application No. 63-255345, and in the process of unwinding yarns from a plurality of yarns, a ring-shaped guide was used. It is proposed that a unique balloon is formed for each yarn of each yarn feeder by introducing the yarn from different directions into the section, and the position of the yarn feeder is specified by detecting the formation position of the balloon with a sensor. ing. In the above prior art, the yarn feeder is used to specify the yarn feeder at the time of yarn breakage. In addition to the function of specifying the yarn feeder, a function of detecting the presence or absence of yarn breakage is naturally required. This yarn breakage detection function uses the signal of a specific sensor from the yarn supplying body, compares the signal generation period from the sensor with the monitoring time, and the signal generation period from the sensor becomes longer than the monitoring time. It can be embodied by judging that the thread is in a broken state when the thread is broken.

[Problems of the prior art]

However, when the yarn feeder is switched, while the yarn moves from the formation region of one balloon to the formation region of the other balloon, the yarn enters the blind spot of the monitoring region of the sensor, that is, outside the monitoring region, and no yarn signal is generated. It takes a considerable time from when the yarn signal is generated in the formation region of one balloon to when the yarn signal is generated in the formation region of the other balloon. In order to prevent the discontinuous state of the sensor signal from being erroneously determined as the thread break state, the monitoring time of the thread break is set long. In this case, the normal thread break monitoring is naturally performed in a long monitoring time, so after the thread break actually occurs,
It takes a long time until the thread breakage state is determined, and the stopping operation of the instigator is also delayed. In particular, in the case of a high-speed loom, in some cases, the yarn ends cut during this time are woven into the woven fabric, and the loom is stopped due to poor weft insertion. In this case, in addition to the operation of pulling out the yarn from the new yarn supplying body, the operation of removing the defective yarn must be performed.

For this reason, there is a demand to set the thread break monitoring time as short as possible, detect the thread break state as soon as possible, and stop the loom as quickly as possible.

[Object of the invention]

Therefore, an object of the present invention is to use a yarn signal of a sensor for specifying a yarn feeder, and to specify a yarn feeder,
In order to realize the thread breakage detection function, the monitoring time is set as short as possible so that the thread breakage state can be detected quickly.

[Solution of the Invention]

Accordingly, the present invention provides a process of unwinding yarns from a plurality of yarn feeders and guiding the yarns inside a ring-shaped guide member to form a balloon in a different region for each yarn of the yarn feeder. In the region, the yarn is detected by a dedicated balloon sensor, and when the yarn feeder is switched, the yarn that changes from one region to the other region is detected by the shift sensor, and the yarn signals of these balloon sensors and the yarn sensor of the shift sensor are detected. The yarn signal is sent to the signal processing unit, the logical sum of the yarn signal from the balloon sensor and the yarn signal from the displacement sensor is calculated, and the generation cycle of the logical sum signal is compared with the monitoring time to determine the yarn break state. I try to judge.

[Function of the invention]

When the yarn is unwound from a yarn supplying body, a balloon sensor corresponding to the yarn continuously generates a pulse-like yarn signal by detecting a balloon of the yarn inside the guide member, and outputs a signal. Sent to the processing unit. If the generation cycle of the OR signal based on the pulse-like thread signal is shorter than the monitoring time, it can be confirmed that the thread is not broken.

In the process where all the yarns of the current yarn supply are consumed and the yarn is unwound from the new yarn supply, the yarn moves from the current balloon formation region to another balloon formation region. Also in this yarn shifting process, the shifting sensor generates a pulse-like yarn signal by detecting the balloon of the yarn, and sends it to the signal processing unit. Therefore, if the generation cycle of the logical sum signal based on the pulse-like yarn signal is shorter than the monitoring time in the process of switching the yarn supplying body, it can be confirmed that the yarn is not broken. Therefore, the monitoring time for thread breakage can be shortened as much as possible, whereby the thread breakage state can be detected quickly.

[Example 1 (FIGS. 1 to 4)] As shown in FIGS. 1 and 2, the unwound yarn sensor device 1 of the present invention has a ring-shaped guide for introducing the yarns 2a and 2b. Member 4, balloon sensors 5a and 5b, and displacement sensor 7
And the signal processing unit 9. 6a, 6b and 8 are light projectors.

The two yarns 2a and 2b are tied between the ends of the winding end and the winding start, are unwound from the yarn supply bodies 3a and 3b, respectively, and are introduced into the ring-shaped guide member 4 from different directions. . In this introduction process, as shown in FIG. 2, the yarn 2a passes through the guide member 4 while forming a balloon within the region A. Similarly, the yarn 2b passes while forming a balloon in the range of the region B inside the guide member 4. These balloon-forming regions A and B are generally elliptical and do not interfere with each other.

Then, the balloon sensors 5a and 5b and the light emitters 6a and 6b
Are arranged in the major axis direction of the respective areas A and B in a state of being optically opposed on the same optical axis, and the displacement sensor 7 and the projector 8 are also optically opposed to each other, and the areas A,
It faces outside the range of B. When the yarn 2a is unwound from the yarn supplying body 3a, the balloon sensor 5a generates a pulse-like yarn signal by detecting that light is shielded by the yarn 2a. Similarly, when the yarn 2b is unwound from the yarn supplying body 3b, the balloon sensor 5b generates a pulse-like yarn signal. Also, for example, when the yarn 2a for the yarn feeder 3a is consumed and the yarn 2b is newly drawn out from the yarn feeder 3b, the yarns 2a and 2b move from the area A to the area B in the switching process. By moving while drawing a trajectory and blocking the light from the light projector 8, the displacement sensor 7 generates a thread signal.

These thread signals are input to the signal processing unit 9 and are synthesized on the time axis via the OR gate 10 inside the signal processing unit 9 as shown in FIGS. By continuously triggering 11, an “H” level output is continuously generated. The “H” level output of the retriggerable vibrator 11 is inverted by the knot circuit 14 and becomes an “L” level output. However, if the generation cycle of those yarn signals becomes longer due to the occurrence of a yarn breakage, the output of the retriggerable vibrator 11 becomes “L” level after the monitoring time T, and is output to the knot circuit 14 as “H” level output. A loom stop signal appears. Thereby, the loom control system immediately stops the loom. Note that the monitoring time T is the same as the retriggerable vibrator 11.
Is set by the setting unit 19, and is set slightly larger than the generation cycle of the pulse-like thread signal in a normal normal operation. Therefore, if the yarn 2a or the yarn 2b is continuously unwound from the yarn feeder 3a or the yarn feeder 3b, respectively, the generation cycle of the yarn signal slightly changes due to the change in the winding diameter, but almost the same pulse. It occurs continuously in a cycle. In addition, even when the unwinding from the yarn feeders 3a and 3b is switched, the yarn signal from the displacement sensor 7 is transmitted to the signal processing unit 9
The OR gate 10 is connected to the balloon sensor 5
The logical sum of the yarn signal from the a and 5b and the yarn signal from the displacement sensor 7 is calculated, and this logical sum signal, that is, the output of the OR gate 10, has a slightly larger pulse period before and after the switching, but as a whole the monitoring time That is, it occurs at a generation cycle that does not exceed T. Therefore, the monitoring time T can be set shorter than the conventional monitoring time, that is, the time during the switching, within a range larger than the occurrence cycle before and after the switching.

On the other hand, the yarn signals from the balloon sensor 5a, by triggering a retriggerable multivibrator 13 constant T _a time, by the flip-flop 15 and set state, at its output Q, in withdrawal from the area A It outputs a certain signal. Further, when a yarn signal is generated from the balloon sensor 5b due to the yarn supply switching, the time constant
Retriggerable vibrator 12 of the T _b is, flip-flop
15 is set to the reset state, and a signal indicating that drawing is being performed in the area B is output from the inverted output. In this way, the yarn feeders 3a and 3b currently being pulled out can be specified according to the level state of the yarn signal from the output terminal of the flip-flop 15.

Note that the disposition sensors 7 and the light projectors 8 are not located on the diameter line passing between the areas A and B, but as shown by imaginary lines in FIG. Can also be set to In this case, the yarn supply switching, in particular, the yarns 2a and 2b traverse the optical axis of the displacement sensor 7 while forming a balloon and move to an adjacent region. Therefore,
In the process of shifting the yarns 2a and 2b, it is possible to reduce a region where a yarn signal cannot be obtained. As a result, the monitoring time can be set small.

Incidentally, as shown by the solid line in FIG.
When the yarns 2a and 2b are provided so that they do not extend over any area, the yarns 2a and 2b take a time from the start of the displacement to the arrival at the optical axis of the displacement sensor 7 and from the deviation from the optical axis of the displacement sensor 7. The period until the vehicle arrives at the next region is a blind spot region where a thread signal cannot be obtained. Therefore, the monitoring time T must be set to be longer in consideration of the time required to pass through the blind spot through the area.

[Embodiment 2 (FIGS. 5 to 7)] This embodiment is an example in which the function of one balloon sensor 5b is shared by the displacement sensor 7 to reduce the number of sensors.

That is, the optical axis of the displacement sensor 7 is, as shown in FIG.
It is provided over two regions A and B. Therefore, the displacement sensor 7 monitors two areas A and B simultaneously. Then, the other balloon sensor 5a monitors only the area A, and distinguishes it from the other area B based on the monitoring result.

The thread signal of the displacement sensor 7 and, if necessary, the thread signal of the balloon sensor 5a become a logical sum signal at the OR gate 10 to drive the retriggerable vibrator 11, and as described above, as shown in FIGS. Then, the yarn breakage state is detected by comparing the monitoring time T with the generation cycle, and the loom stop signal is generated. On the other hand, the yarn signal from the balloon sensor 5a is input to the retriggerable vibrator 13. The outputs of the two retriggerable vibrators 11 and 13 are connected to AND gate 16
The output of the AND gate 16 drives the first one-shot circuit 17 at the rising edge, sets the flip-flop 15 to a set state, and drives the second one-shot circuit 18 at the falling edge to output the flip-flop. Step
15 is reset. In order to prevent the output from the one-shot circuits 17 and 18 from being output when the thread breakage state occurs, it is set that T _a > T, and the one-shot circuits 17 and 18 are turned on only when the retriggerable vibrator 11 is on. It is supposed to work.

[Embodiment 3 (FIGS. 8 and 9)] This embodiment corresponds to three yarn feeders 3a, 3b, and 3c.
This is an example in which the balloon sensor 5a, 5b, 5c for each of the regions A, B, and C also serves as the displacement sensor 7 to reduce the number of sensors.

At present, it is assumed that the yarn 2a forms a balloon in the area A, and when the yarn feeder 3a switches here, a new yarn 2b is pulled out from the yarn feeder 3b corresponding to the area B, At B, the thread 2b forms a balloon. Regarding these two areas A and B, the balloon sensor 5a corresponds to the displacement sensor 7, and the balloon sensor 5b and / or the balloon sensor 5c identify the areas A and B. Similarly, regarding the two regions B and C, the balloon sensor 5b corresponds to the displacement sensor 7, and the balloon sensors 5a and 5c correspond to the regions B and C.
Identify. Similarly, regarding the two regions C and A,
The balloon sensor 5c corresponds to the displacement sensor 7, and the balloon sensors 5a and 5b correspond to the areas A and C, respectively. As described above, in accordance with the withdrawal of the yarns 2a, 2b, 2c, the respective balloon sensors 5a, 5b, 5c perform the function of the displacement sensor 7 in addition to the original function.

In the embodiment shown in FIG. 9, the reflecting mirrors 20 and 21 are arranged on the inner periphery of the guide member 4 at substantially the intermediate positions of the respective regions.
By a set of the displacement sensor 7 and the projector 8, the areas A, B,
This is an example in which the boundary area of C is detected and the function of the balloon sensor 5c is also used for the area C. This also reduces the number of sensors.

〔The invention's effect〕

In the present invention, since the presence / absence of a yarn can be detected by the displacement sensor even at the boundary portion of the balloon region, the generation cycle of the logical sum signal of the yarn signal from the balloon sensor and the yarn signal from the displacement sensor is changed before and after the yarn feeder is switched. But not bigger,
Therefore, the monitoring time of the yarn signal generation cycle can be set as short as possible, whereby the yarn breakage state can be detected early, and the loom can be stopped quickly.

[Brief description of the drawings]

FIG. 1 is a perspective view of the unwinding yarn sensor device, and FIG.
FIG. 3 is a block diagram of a signal processing unit of the first embodiment, FIG. 4 is a time chart of the first embodiment, FIG. 5 is a front view of a sensor of the second embodiment, and FIG. 6 is a block diagram of a signal processing unit according to the second embodiment, FIG. 7 is a time chart of the second embodiment, and FIGS. 8 and 9 are third embodiments.
It is a front view of the sensor part of FIG. 1 ... Unwinding yarn sensor device of the yarn supplying body, 2a, 2b, 2c ...
3a, 3b, 3c: Thread supply member, 4: Guide member, 5a, 5b, 5c
...... Balloon sensor, 6a, 6b, 6c Floodlight, 7 Transition sensor, 8 Floodlight, 9 Signal processor, 10 OR gate, 11, 12, 13 Retriggerable vibrator,
14… Not circuit, 15… Flip-flop, 16… And gate, 17, 18… One shot circuit, 19… Setting device, 20, 21… Reflector.

Claims (4)

(57) [Claims] 1. A ring-shaped guide member for introducing a yarn unwound from a plurality of yarn feeders from different directions for each yarn feeder to form a balloon in a different region, and detecting the yarn in a region of each balloon. A balloon sensor for detecting a yarn that changes between two regions when the yarn feeder is switched, and a logical sum of a yarn signal from the balloon sensor and a yarn signal from the shift sensor. And a signal processing unit that outputs a loom stop signal when the generation cycle of the logical sum signal is longer than the monitoring time and outputs a loom stop signal. 2. A method according to claim 1, wherein the yarn is formed before and after switching of the yarn supplying body.
The unwinding yarn sensor device for a yarn supplying body according to claim 1, wherein the displacement sensor is arranged so as to extend over a region of one balloon. 3. A yarn sensor for unwinding a yarn supplying body according to claim 1, wherein said balloon sensor is also used as said displacement sensor. 4. The detection area of said displacement sensor is defined by a reflecting mirror.
4. The unwinding yarn sensor device for a yarn supplying body according to claim 1, wherein the yarn forming device extends over the balloon forming region.