DE102015012073A1 - Thread monitoring device, thread winding machine and thread monitoring method - Google Patents

Abstract

A yarn monitoring device (15) includes a sensor unit (35), a detection section (55), a setting section (58) and an evaluation section (53). The sensor unit (35) outputs a detection value corresponding to the presence / absence of the thread (10) in the detection area (36) and / or a state of the thread (10). The detection section (55) detects the detection value in a state where no thread (10) is located in the detection area (36). The setting section sets an evaluation reference value based on at least one of a plurality of detection values obtained by repeating detection of the detection value by the detection section until the thread is introduced into the detection area. The evaluation section (53) evaluates the state of the thread (10) based on the evaluation reference value set by the setting section (58).

Description

BACKGROUND OF THE INVENTION

1. Field of the invention

The present invention mainly relates to a yarn monitoring device designed to monitor a running yarn.

2. Description of the Related Art

A thread winding machine configured to wind a thread around a bobbin, such as a spinning machine and an automatic winder, is conventionally known. This type of thread winding machine includes a thread monitor (yarn clearer). An optical thread monitor irradiates the running thread with light and measures the light transmitted through the thread or the light reflected from the thread to monitor the condition of the thread in real time and detect a thread defect (abnormality portion of the thread).

JP 2013-204190 A and JP 2013-203527 A , such as JP 3707413 B2 disclose an optical thread monitor.

The amount of light (light projection amount) emitted from a light projecting portion of the thread monitor may change due to temperature drift. In particular, during a constant period immediately after turning on the power of the yarn monitoring device, the temperature of the light projecting section may greatly increase, and the amount of light projection may become smaller within a few seconds before the thread is inserted. As a result, when the thread is inserted into the thread monitor after lapse of a few seconds since an evaluation reference value (zero point) of the thread monitor has been set, the thread monitor can not accurately detect the condition of the thread. Further, the properties of the yarn monitoring apparatus may change not only due to the heat of the light projecting portion, but also, for example, due to moisture and the like. In the case of a capacitive thread monitor, moisture affects the properties of the thread monitor.

The JP 2013-204190 A and JP 2013-203527 A , and JP 3707413 B2 describe adjusting an evaluation reference value of the thread monitoring apparatus, but do not describe a technique for adjusting the evaluation difference value in consideration of the temperature drift.

BRIEF SUMMARY OF THE INVENTION

The present invention has been made in view of the above circumstances, and its main object is to provide a thread monitoring apparatus capable of reducing the influence of environmental change and accurately detecting a condition of the thread.

The problems to be solved by the present invention are as described above, and now the means and effects for solving such problems will be described.

According to a first aspect of the present invention, there is provided a thread monitoring apparatus having the following configuration. In particular, the thread monitoring device includes a detection section, a detection section, a setting section, and an evaluation section. The detection section is configured to output a detection value corresponding to the presence / absence of a thread in a detection area and to a state of a thread when the thread exists in the detection area. The detecting section is configured to detect the detection value in a state where the thread does not exist in the detection area. The setting section is configured to set an evaluation reference value to be used in evaluating the state of the thread. The evaluation section is configured to evaluate the state of the thread based on the evaluation reference value set by the setting section and the detection value output by the detection section. The setting section sets the evaluation reference value based on at least one of a plurality of detection values detected by repeatedly detecting the detection value by the detection section until the thread is inserted into the detection area. Alternatively, the setting section sets the evaluation reference value based on one of the plurality of detection values detected by the detection section at a predetermined timing. The predetermined timing is determined based on a time detected by the detection section from the outside, the time at which the thread is inserted into the detection area.

Thus, for example, the detection value output from the detection area immediately before the thread is inserted into the detection area can be obtained by continuously and iteratively detecting the detection value output from the detection section. Furthermore, the time at which the thread enters the Detection section is detected from the outside, and the detection value can be detected at a suitable timing based on the detected time, so that the detection value that is output from the detection section immediately before the insertion of the thread in the detection area is obtained similarly. Thus, the influence of the environmental change (temperature drift, humidity change, adhered contamination and the like) is changed by defining the evaluation reference value using the detection value detected at the relevant timing. Therefore, the condition of the thread can be accurately detected.

The yarn monitoring apparatus described above preferably has the following configuration. In particular, the thread monitoring device includes a thread-present / missing-determining section. The thread presence / absence determination section is configured to determine whether or not the thread exists at a predetermined position of the detection area, and whether or not the thread is inserted at the predetermined position of the detection area. The set area sets the evaluation reference value based on the detection value detected by the detection section before the thread presence / absence determination section determines that the thread is inserted in the detection area.

In other words, even if the detection value is detected after the thread is inserted into the detection area, this detection value can not be used as a candidate for the reference value, and therefore, using this detection value, no suitable evaluation reference value can be set.

The yarn monitoring apparatus described above preferably has the following configuration. Specifically, the detection section includes a light projecting section configured to project light onto the detection area, and a light receiving section configured to receive the light projected from the light projecting section and to output an electric signal corresponding to a light receiving amount. The yarn monitoring apparatus further includes an adjusting portion configured to perform an adjusting process for adjusting a light projection amount of the light projecting portion so that the detection value when the thread does not exist in the detection area coincides with a predetermined value.

In other words, the light projection amount of the light projecting portion and the light receiving amount of the light receiving portion may possibly vary due to the environmental change. Therefore, the light projection amount can be actively adjusted by executing the adjustment process according to the environmental change, and the evaluation accuracy of the state of the thread can be stabilized.

The yarn monitoring apparatus described above preferably has the following configuration. In particular, the thread monitor includes a storage section for storing the first threshold and a second threshold. The first threshold is a value for defining one of the boundaries of a predetermined range with respect to the detection value in a state where the thread does not exist in the detection range. The second threshold is a threshold for determining whether or not the thread exists at the predetermined position of the detection area, the second threshold being a value outside the predetermined range and being a value exceeding the first threshold. When immediately after detection that the detection value exceeds the first threshold, the detection section detects the detection value between the first threshold and the second threshold for a predetermined number of times, which is one or more times, the adjustment section executes the adjustment process.

In other words, when the thread is inserted into the detection area, the detection value output from the detection unit usually varies greatly, and the detection section may detect the start of such variation as the detection value. If the influence of the temperature drift is too large to be tolerated, the adjustment process is preferably carried out to adapt to the environmental change. In this regard, according to the above-described configuration, in the course of the multiple detection of the detection value by the detection section, if the detection value exceeding the first threshold value and then the detection value between the first threshold value and the second threshold value are obtained in that the detection value has increased by the influence of temperature drift, and therefore the adjustment process is carried out. Thus, the adjustment process is performed only when necessary, whereby the influence of the temperature drift can be accurately eliminated without decreasing the efficiency, and the judgment of the state of the thread can be returned by the evaluation section to a state where the evaluation is carried out accurately can.

In the yarn monitoring apparatus described above, immediately after detection, if the detection value is the first If the threshold exceeds the threshold value, the detection section detects that the detection value exceeds the second threshold value, the thread presence / absence determination section preferably determines that the thread is inserted into the detection area.

Thus, it can be determined with a simple process whether or not the thread is inserted into the detection area, while clearly distinguishing a case in which the detection value exceeds the first threshold due to the influence of the temperature drift and the like.

The yarn monitoring apparatus described above preferably has the following configuration. More specifically, the detection value detected by the detection section is stored in the memory section. The setting section sets the evaluation reference value based on the detection value stored in the storage section when the thread does not exist in the detection area. If the detection value is a value outside the predetermined range, if the thread does not exist in the detection area, the detection value is not stored in the memory section.

In other words, if the value outside a normal range, which the value usually occupies, is detected as the detection value, it is not appropriate to use this detection value for the calculation of the evaluation reference value. In this regard, according to the configuration described above, the detection value outside the predetermined range is prevented from being stored in the memory portion, so that the detection value outside the normal range can be reliably prevented from being used for the evaluation reference value calculation.

In the thread monitoring apparatus described above, the setting section preferably sets the evaluation reference value based on the detection value obtained before a detection value detection timing, which is a predetermined number of times before a time point at which the thread presence / absence determination section determines Thread is inserted into the predetermined position of the detection area.

In other words, in the course of introducing the yarn into the detection area, the detection value output from the detection section may show unstable behavior. In this regard, in the above-described configuration, by applying the detection value before a timing that is a predetermined number of times back from the time point when the determination is made that the thread is inserted into the detection area, the evaluation reference value can be used of a suitable detection value from which the influence described above is eliminated.

In the thread monitoring apparatus described above, the setting section preferably sets, as the evaluation reference value, an average value of the plurality of detection values detected by the detection section.

Thus, it is prevented that the variation of the individual detection value by different types of noise is reflected too much on the evaluation reference value, and the evaluation reference value can be suitably defined.

The yarn monitoring apparatus described above preferably has the following configuration. More specifically, the yarn monitoring apparatus includes a counting section configured to count an elapsed time in a state where the yarn is stationary in the detection area. When the count of the count section exceeds a predetermined time, the thread is cut with a cutter or an external cutter disposed in the thread monitor.

In other words, if, for example, the doffing operation is performed manually, a long time may elapse with the thread existing in the detection area and without the thread running. In this case, the influence of the temperature drift and the like may become a problem. Meanwhile, even if, in the meantime, the setting value of the old evaluation reference value is discarded to reset the evaluation reference value, the detection value in a state where the thread does not exist can not be detected by the detecting section because the thread already exists in the detection area. In this regard, in a state where the thread does not exist in the detection area, the detection value is re-detected by forcibly cutting the thread as described above, and the evaluation reference value can be reset.

According to a second aspect of the present invention, there is provided a thread winding machine having the following configuration. In particular, the thread winding machine includes the thread monitoring device, a winding section, a thread connecting device and a thread catching and guiding device. The winding section is designed to wind the thread to form a winding body. The thread connecting device is designed to carry out the thread connecting operation. The thread catching and guiding device is adapted to the thread to the Thread guiding device to lead. The detecting section detects one or a plurality of the detected detection values at a timing determined based on a timing at which the thread catching and guiding device guides the thread to the thread connecting device. The setting section sets the one detection value or an average value of the plurality of detection values detected by the detection section at the predetermined timing as the evaluation reference value.

In other words, the thread does not exist in the detection area of the thread monitoring device in a state where the thread is severed, but the thread is inserted into the detection area when the thread connecting operation is performed by the thread connecting device. Therefore, the detection value is detected at the timing determined based on the timing at which the thread catching and guiding device guides the thread to the thread connecting device, so that the detection value is obtained efficiently just before the thread is inserted into the detection area can. Furthermore, the number of detections of the detection value can be reduced.

According to a third aspect of the present invention, there is provided a thread monitoring method of the following configuration. Specifically, the thread monitoring method comprises: detecting a value corresponding to the presence / absence of a thread in a detection area and corresponding to a state of the thread when the thread exists in the detection area; Detecting the detection value if the thread does not exist in the detection area; Setting an evaluation reference value to be used in evaluating the condition of the thread; and evaluating the state of the thread based on the evaluation reference value set in the setting step and the detection value output in the detection step, and characterized by setting the evaluation reference value based on at least one of a plurality of the detection values until the thread is inserted in the detection area.

BRIEF DESCRIPTION OF THE DRAWINGS

1 Fig. 10 is a side view schematically illustrating a yarn winding unit according to an embodiment of the present invention;

2 Fig. 11 is a side view of a thread winding unit showing a state where thread ends are caught by a first thread catching device and a second thread catching device;

3 Fig. 11 is a side view of a thread winding unit showing a state where the thread ends are guided by the first thread catching device and the second thread catching device to a thread connecting device;

4 Fig. 10 is a block diagram illustrating an electrical configuration of a thread monitor;

5 Fig. 12 is a graph for describing the influence of a temperature drift on the detection value;

6 Fig. 12 is a graph for describing a process of a case in which the detection value sharply increases due to the influence of the temperature drift;

7 Fig. 12 is a graph illustrating an example of the transition from the detection value when the thread is inserted into the detection area;

8th Fig. 12 is a graph showing another example of the transition of the detection value when the thread is inserted into the detection area;

9 Fig. 10 is a flowchart illustrating a process executed by a thread monitor control section; and

10 Fig. 10 is a graph describing a process of a case where the thread is left for a long period of time after insertion into the detection area.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a schematic side view of a filament winding unit 1 , which is arranged in a thread winding machine according to an embodiment of the present invention.

The thread winding machine of the present embodiment has a configuration in which a plurality of thread winding units 1 arranged in a row. The thread winding machine includes a machine management device (not shown) that holds the thread winding unit 1 intensively managed.

In the 1 shown filament winding unit 1 is configured to receive a thread fed from a thread feed section (not shown) 10 around a winding spool 21 to wrap around a bobbin 20 to build. If the filament winding machine is an automatic winder, as in 1 represented, corresponds to a mechanism, which to carry the Fadenzuführspule is designed, the yarn feed section.

Each thread winding unit 1 contains a unit control section 30 , The unit control section 30 is configured by hardware such as CPU, ROM and RAM, and software such as a control program stored in the ROM and / or the RAM. With the cooperative operation of the hardware and the software, the unit control section controls the component of the thread winding unit 1 , The unit control section 30 each thread winding unit 1 is configured to be able to with the machine management device 1 to communicate. Thus, the operation of each thread winding unit 1 be managed intensively by the machine management device.

The thread winding unit 1 includes, in order from upstream in a thread running direction, the yarn feeding section, an upstream guide 11 , a first thread catching device (thread catching and guiding device) 12 , a second thread catching device (thread catching and guiding device) 13 , a thread connecting device 14 , a thread monitoring device 15 , a downstream guide 17 and a winding section 18 ,

The upstream guide 11 is located a little upstream of the Fadenzuführabschnitts. The upstream guide 11 guides the yarn supplied from the yarn feeding section 10 ,

The first thread catching device 12 is configured to be pivotable, as in the 1 to 3 shown when the unit control section 30 a motor (not shown) drives. The first thread catching device 12 is connected to a negative pressure source (not shown) and may be on a far end side (the opposite side of the pivot center) of the first thread catching device 12 create a suction flow.

The second thread catching device 13 is similar to the first thread catching device 12 is configured to be pivotable when the unit control section 30 a motor (not shown) drives. The second thread catching device 13 is connected to a negative pressure source (not shown) and may be on a far end side (the opposite side of the pivot center) of the second thread catching device 13 create a suction flow.

If the thread 10 between the yarn feeding section and the winding section 18 is cut for any reason, becomes the first thread catcher 12 pivoted to Fadenzuführabschnitt to suck the thread end of the Fadenzuführabschnitt and catch, as in 2 shown. The second thread catching device 13 becomes the winding section 18 pivoted toward the thread end of the bobbin 20 to suck in and catch.

After that, the first thread catcher 12 and the second thread catching device 13 respectively to the thread connecting device 14 pivoted out while the thread ends are sucked. Thus, the yarn end of the yarn feed section and the yarn end of the winding section 18 to the thread connecting device 14 led out as in 3 shown.

The thread connecting device 14 is configured as a pneumatic splicer which provides air swirling flow to the yarn end from the yarn feed section and the yarn end from the section 18 act to twist and connect the two thread ends. However, the thread connecting device is 14 not limited thereto, and may also be, for example, a mechanical entangler.

In a series of steps of the yarn joining process, the timing with which the first thread catching device 12 and the second thread catching device 13 be pivoted from the unit control section 30 controlled / regulated. The unit control section 30 drives the first thread catching device 12 and the second thread catching device 13 For example, after a predetermined time from the occurrence of a thread break on.

The thread monitoring device 15 monitors the condition (thickness, interference of foreign substances such as colored yarn, polypropylene and the like) of the running yarn 10 , and detects a thread defect (abnormality section in thread 10 ), in the thread 10 is included. The thread monitoring device 15 also contains a knife (cutting device) 16 , designed to cut the thread 10 when the thread monitoring device 15 detected the thread defect. The detailed configuration of the thread monitoring device 15 will be described later.

The downstream guide 17 is slightly downstream of the thread monitor 15 arranged. The downstream guide 17 leads to the winding section 18 guided thread 10 ,

The winding section 18 includes a bobbin carrier section (not shown) and a winding drum 19 , The winding drum 19 is driven while making contact with the outer peripheral surface of the reel spool 21 or the bobbin 20 manufactures. The winding section 18 drives the winding drum 19 with a motor (not shown) and winds the thread while the thread 10 traversed while the bobbin is rotating, being in contact with the winding drum 19 makes the bobbin 20 to build. The winding drum 19 is provided with a groove for traversing.

The method of performing the traversing is arbitrary and the traversing device can be customized for each filament winding unit 1 be arranged, or the traversing device may be the thread 10 a plurality of thread winding units 1 traverse. Further, the configuration of the winding section 18 not limited to the configuration described above. For example, instead of the winding drum 19 with grooves, a configuration incorporating a no-contact contact roller and an arm-type traversing device independent of the contact roller. With such a configuration, the reel spool becomes 21 (Bobbin 20 ) directly driven by the engine. The winding body 20 is by winding up the thread 10 formed while the thread 10 traversed by the arm-type traversing device, the winding spool 21 (Bobbin 20 ) makes contact with the contact roller.

If the thread 10 a predetermined length around the reel spool 21 is wound around and the winding body 20 is completely wound up, the thread becomes 10 with the knife 16 the thread monitoring device 15 or another cutting means is automatically cut, and is the winding of the winding section 18 stopped. Thereafter, the bobbin 20 is removed from the bobbin carrier section with an automatic puller or by manual operation of an operator, and instead becomes an empty reel spool 21 mounted on the winding body support section and the winding is resumed. The automatic peeling device becomes the thread winding unit 1 which has issued, for example, a stripping request signal to the bobbin 20 to collect. Thereafter, the automatic puller brings a new reel spool 21 on the winding body support section and performs a predetermined Fadenaufhakvorgang.

Next, details of the thread monitoring apparatus will be described 15 in particular, the electrical configuration with respect to 4 , 4 FIG. 12 is a block diagram showing an electrical configuration of the thread monitor. FIG 15 represents.

As in 4 shown containing the thread monitoring device 15 an optical sensor unit (detection section) 35 and a thread monitoring control section 50 ,

The sensor unit 35 can change the condition of the thread 10 measure up. The sensor unit 35 contains a driver circuit 40 , a light projection section 41 , a light receiving section 42 , an amplifier 43 , a high pass filter 44 , an amplifier circuit 45 and an indicator light (display) 46 , The knife 16 is on a housing of the sensor unit 35 appropriate.

The light projection section 41 includes a light-emitting element configured by a light-emitting diode (LED). The light projection section 41 irradiates a room (slot-shaped recess of 4 ) through which the thread 10 running, with light of a quantity of light, which is one of the driver circuit 40 input driver voltage corresponds. That of the driver circuit 40 generated driving voltage is determined based on an electrical signal from one in the thread monitoring control section 50 arranged DA converter 42 is entered.

The light receiving section 42 is at a the light projection section 41 opposite side, with the thread path in between, arranged. The light receiving section 42 includes a light receiving element configured by a photodiode and the like. The light receiving section 42 receives transmitted light from the light coming from the light projecting section 41 on the thread 10 is radiated, and outputs the electrical signal (a voltage) corresponding to the light receiving amount. The electrical signal changes according to the shape (cross-sectional shape) of the thread 10 who is in the detection area 36 exist. The transmitted light, to which reference is hereby made, is the light which is the light receiving section 42 has reached when the light projection section 41 output light through the existence of the thread 10 partially shielded. In other words, the transmitted light is the light that is the thread 10 happened. The detection area 36 is an area in the slot-like recess where the light from the light projection section 41 hits, and is an area where the thread 10 in accordance with the light receiving amount of the light receiving section 42 can be detected.

That of the light receiving section 42 output electrical signal is from the amplifier 43 amplified, and thereafter a signal having a predetermined high frequency with the high-pass filter 44 extracted, with the amplifier circuit 45 reinforced again. In the amplifier 43 an inversion process is performed, and that of the amplifier 43 output electric signal becomes smaller when the light receiving amount of the light receiving portion 42 gets bigger. That from the amplifier 43 and the amplifier circuit 45 amplified electrical signal is, as a detection value from the sensor unit 35 issued by an AD converter 51 the thread monitoring control section 50 converted into a digital signal.

The indicator light 46 is, for example, on a housing of the sensor unit 35 attached, and shows the operator the operating state of the thread monitoring device 15 by turning it on and off. In the present embodiment, the indicator lamp is 46 configured as a so-called two-color LED and can, for example, light up in green and red. The light status of the indicator light 46 is from the thread monitoring control section 50 controlled.

The knife 16 is near the detection section 36 arranged in the housing of the sensor unit 35 is trained. The knife 16 includes a cutting blade (not shown), for example driven by an electromagnet. The knife 16 is with the thread monitoring control section 50 electrically connected and is configured to the thread 10 based on one of the thread monitoring control section 50 cut cutting signal to cut.

The thread monitoring control section 50 stores, in a memory section to be described later 57 , an evaluation reference value (zero point) derived from that from the sensor unit 35 outputted detection value is obtained when the thread 10 not in the detection area 36 exist. An evaluation section 53 the thread monitoring control section 50 compares the evaluation reference value with the detection value provided by the sensor unit 35 is issued from time to time when the thread in the detection area 36 exists to the state of the thread 10 to evaluate (to measure).

Next, an adjustment process, a measurement process, and a correction process performed by the thread monitor will be described 15 be listed. The thread monitoring control section 50 contains an adjustment section 54 , a detection section 55 , a thread-present / missing-determining section 56 , a setting section 58 and the storage section 57 , as components to the execution of such processes. In particular, the thread monitoring control section 50 as a computer including hardware such as CPU, ROM and RAM, and software for a control program is stored in the ROM and / or the RAM. With the cooperative operation of the hardware and the software, the thread monitoring control section 50 as the adjusting section 54 , the survey section 55 , the thread-present / missing-determining section 56 , the setting section 58 and the like work.

The adjustment section 54 performs the adjustment process. The adjustment process is a process for adjusting a drive voltage applied to the light projection section 41 in the sensor unit 35 is to put on, so in a state where the thread 10 in the detection area 36 the thread monitoring device 15 does not exist, that of the sensor unit 35 outputted detection value (in particular, the output voltage) coincides with a predetermined Justierreferenzwert.

The detection section 55 performs the measuring process. The measuring process is a process for controlling the sensor unit 35 such that the voltage adjusted by the adjustment process is applied to the light projection section 41 is created and that of the sensor unit 35 currently output detection value is detected in a state where the thread 10 in the detection area 36 the thread monitoring device 15 Does not exist. It is assumed that the detection value obtained in this way (in particular, the output voltage of the sensor unit 35 ) is a value substantially equal to the adjustment reference value in the adjustment process, but may also be a divergent value, for example, due to the influence of environmental change (temperature drift and the like). Whether that of the detection section 55 detected detection value satisfies a predetermined condition or not (specifically, whether or not the detection value is smaller than a normal range threshold value to be described later) is determined, and the condition-satisfying detection value is stored in the memory section 57 stored, which will be described later.

The thread present / missing determination section 56 determines if the thread 10 in the detection area 36 (In particular the thread path) of the thread monitoring device 15 exists or not, and whether the thread 10 in the detection area 36 (In particular, the thread path) is guided or not, based on that of the detection section 55 detected detection value. In particular, the thread-present / missing-determining section determines 56 that the thread 10 exists in the thread path (thread is present) when the output voltage of the sensor unit 35 is greater than or equal to a predetermined threshold (thread present / missing determination threshold), and determines that the thread 10 does not exist in the thread path (thread missing) if the output voltage is not greater than or equal to the predetermined threshold. The detection area 36 is a room of a predetermined size. The thread path in the detection area 36 can be represented as a position where the thread 10 Running, the position by a pair of upper and lower Fadenwegführungen (not shown) is regulated (the position of one point in plan view: predetermined position).

The storage section 57 has a memory area where the content can be updated and is realized, for example, by rewritable volatile or non-volatile memory (eg, RAM and EEPROM). The storage section 57 can store various parameters and the like to the thread monitoring device 15 to control / regulate.

In particular, the memory section 57 store a plurality of measurements taken by the detection section 55 to be obtained. In other words, instead of performing the measuring process only once, the detecting section performs 55 several times repeated a measuring process for each predetermined time interval until the thread 10 in the thread path in the detection area 36 the thread monitoring device 15 is introduced (position of the thread is defined in the thread path: positioning) to detect the detection value each time. The storage section 57 may store the data of the detection value a predetermined number of times in the order of a time series.

The storage section 57 may store a normal range threshold (first threshold) to define the boundary of the range (predetermined range) that the detection value usually occupies when the thread is 10 in the detection area 36 the thread monitoring device 15 Does not exist. When the detection value of the detection section 55 is outside the range defined with the normal range threshold, such a detection value is assumed to be abnormal and is stored in the memory section 57 not saved.

Although details will be described later, the evaluation reference value is based on that in the memory section 57 stored detection value defined. Therefore, if that of the detection section 55 obtained detection value is greater than or equal to the normal range threshold, such an irregular detection value is not in the memory section 57 is therefore not used for the determination of the evaluation reference value by the setting section 58 used.

Furthermore, the memory section 57 store the thread presence / absence determination threshold (second threshold) described above, which is the threshold value that is the limit for the thread presence / absence determination section 56 is used to indicate the presence / absence of the thread 10 to determine. A value greater than the normal range threshold (value near the value of the state where the thread exists) is set for the thread present / missing determination threshold. In the present embodiment, the inversion process becomes in the amplifier 43 is made such that the detection value becomes smaller when the light receiving amount of the light receiving section 42 grows larger, but such an inversion process does not need to be executed. If the inversion process is not performed, the magnitude relation of the detection value is reversed. In other words, a value smaller than the normal range threshold (value near the value of the state where the thread exists) is set for the thread presence / absence determination threshold. The thread present / missing determination threshold is a value outside the normal range, regardless of the presence / absence of the inversion process.

The storage section 57 may also store a set value of the evaluation reference value included in the setting section 58 is determined, which will be described later. The evaluation section 53 evaluates the condition of the thread 10 by comparison with the evaluation reference value. In particular, the average value of the difference between the voltage set for the evaluation reference value and the voltage supplied by the sensor unit 35 with the thread 10 in the detection area 36 the thread monitoring device 15 is obtained for the monitoring of the thread 10 used (for example, calculation of the average thickness of the thread 10 ).

The setting section 58 determines (calculates) the value of the evaluation reference value based on that the detection value among the detection values obtained from the detection sections 55 and in the memory section 57 are stored, satisfies a predetermined condition, and stores the result in the storage section 57 as a new set value. Therefore, in the present embodiment, "correction" in the correction process means re-storing the new evaluation reference value in the memory section 57 , In other words, the correction process is not a process of changing the reference value by largely adjusting the driving voltage for application to the light projection section 41 but is a process for changing the reference value in the calculation.

A stationary time counting section 59 counts the time during which the thread is 10 is stationary without starting to run because the thread-present / missing-determining section 56 determines that the thread is present. The count value is used for determining whether the forcible cutting of the thread 10 to be executed or not, which will be described later.

Next, the determination of the evaluation reference value in the present embodiment will be described.

As described above, the light projection amount of the light projecting portion 41 and the light receiving amount of the light receiving section 42 due to, for example, various causes such as change in environment (temperature, humidity and the like), adhesion of contamination and the like. Conventionally, the adjustment process for adjusting the driving voltage of the light projecting portion 41 is executed, and then the yarn is monitored with the light receiving amount (detection value) measured immediately after the adjustment process as a reference.

However, in the present embodiment, the light projection section is 41 configured by an LED. Therefore, even if, for example, immediately after turning on the power in the yarn monitoring device 15 That is, if the amount of light reception is measured immediately after the adjustment process has been performed, the amount (light projection amount) of the light projecting portion may become, after the measurement of the light receiving amount 41 radiated light change when the temperature of the light projection section 41 Gradually increases (temperature drift).

The change of the light projection amount of the light projection section 41 influences the evaluation of the condition of the thread 10 and the same. The graph of 5 represents a change in the detection value in an ideal case without the temperature drift (broken line) and in a case with the temperature drift (solid line). If the temperature drift does not occur, the obtained detection value after the adjustment process is constant until the thread 10 in the detection area 36 the thread monitoring device 15 is introduced. When the temperature drift occurs, the detection value begins to gradually increase immediately after the adjustment process.

In this regard, he is in the detection area 36 imported thread 10 in the related art having the detection value immediately after the adjustment process as a reference. There are no problems if the temperature drift does not occur, but in fact, the temperature drift occurs easily, especially immediately after the power is turned on. Thus, in the conventional method, the average value of the thickness of the thread 10 include an error according to the temperature drift.

On the other hand, in the present embodiment, the detection value detected at the timing becomes immediately before the thread 10 in the detection area 36 is introduced, rather than immediately after the adjustment process, as the evaluation reference value, and the thread 10 can be rated as a reference with such a detection value. Therefore, accurate yarn evaluation can be performed by eliminating the influence of temperature drift and the like.

Now with respect to the graphs of 6 to 8th a method for the thread monitoring control section 50 of the present embodiment to determine the evaluation reference value in various cases.

As described above, detected after the adjustment portion 54 has carried out the adjustment process, the detection section 55 iteratively the detection value at appropriate time intervals until insertion of the thread 10 in the thread path of the detection area 36 is detected. In the graph of 6 the horizontal axis indicates the time, and the vertical axis indicates the detection value, and detection values (reference value candidate data) detected each time from t1 to t15 are shown. The graph of 6 also represents the normal range threshold and the thread present / missing determination threshold.

The detection section 55 repeats the detection of the detection value at a timing t1, a timing t2, and the like. Im in 6 As shown, with increasing detection, the detection value provided by the sensor unit 35 output detection value due to the influence of temperature drift greater. The detection value may become larger than the normal range threshold at the detection timing t14, which is also the case at t15. The detection values of the two detection timings t14 and t15 are smaller than the thread presence / absence determination threshold.

As long as the from the detection section 55 detected detection value does not become greater than or equal to the normal range threshold, stores the thread monitoring control section 50 if necessary, the detection value in the memory section 57 , as a candidate to be used for the calculation of the subsequent evaluation reference value. Therefore, the detection values detected at the timings from t1 to t13 become in the memory section 57 stores. The detection values detected at the timings t14 and t15 are greater than or equal to the normal-range threshold, and therefore, in the memory section 57 does not save.

If the detection values are continuously greater than or equal to the normal range Threshold, as at t14 and t15, it is assumed that the influence of temperature drift has occurred to an intolerable extent. Therefore, if the detection value (detection value between the normal-range threshold and the thread-present / missing-determination threshold) that is greater than or equal to the normal-range threshold and less than the thread-present / missing-determination threshold is continuous twice is obtained, the thread monitoring control section performs 50 a controller by to the adjustment process by the Justierabschnitt 54 to execute again. Along with this, the measurement process is executed again after the adjustment process that is executed again is completed.

Next, a case will be described in which the detection value is made to transition, as in FIG 7 , In the example of 7 For example, the detection value at the time t1 has an increasing tendency, but the influence of the temperature drift substantially converges with time, and the detection values are stabilized at t11 to t13. However, the detection value at timing t14 becomes larger than the normal-range threshold, and the detection value becomes larger at t15 than the thread-present / missing-determination threshold.

In this case, the thread monitoring control section stores 15 the detection values in the memory section 57 because of the detection section 55 detected detection values at the timings t1 to t13 are smaller than the normal range threshold value. On the other hand, the detection values detected at the timings t14 and t15 are greater than or equal to the normal-range threshold, and therefore, in the memory section 57 not saved.

Since the detection value obtained at the timing t15 is larger than the thread presence / absence determination threshold, the thread presence / absence determination section determines 56 that the thread 10 in the thread path of the detection area 36 is introduced (thread is available). In this case, the setting section reads 58 from the storage section 57 a predetermined number of the latest detection values detected before the detection timing, which is a predetermined number of times (three times in the present embodiment) from the time when the determination was made that the thread exists, and calculates an average value for setting the obtained value as the evaluation reference value. The correction process can be carried out in this way.

The case of 7 and the case of 6 are common in that the detection value exceeds the normal range threshold at time t14 for the first time. However, in the case of 7 the detection value at the next timing t15 is the thread presence / absence determination threshold, and therefore the determination is made that the thread is present and the evaluation reference value is calculated, whereas in the case of 6 the detection value at the next timing t15 is between the normal-range threshold and the thread-present / missing-determination threshold, and therefore the process of the adjustment process is executed again. Therefore, in the present embodiment, when the detection value exceeds the normal range threshold, the subsequent process differs depending on whether or not the next detection value exceeds the thread presence / absence determination threshold.

As described above, in the thread monitoring device 15 In the present embodiment, the evaluation reference value is not determined until the determination by the thread presence / absence determination section 56 is done that the thread 10 in the thread path of the detection area 36 is introduced, and the detection section 55 continues to iteratively capture new detection values (reference value candidate data). Thus, the evaluation reference value may be defined using the detection value that is close to the timing to which the thread is being added 10 in the detection area 36 is introduced, so that the influence of the temperature drift and the like can be eliminated by a maximum amount.

The detection value detected at the timing which is a predetermined number of times (three times) back from the timing at which the determination is made that the thread exists is selected as the detection value for the calculation from the average of the evaluation reference value , This is because of the detection value, just before the thread 10 is introduced into the thread path, due to the influence of the movement of the thread 10 often varies. For example, as in 8th 4, a transition is made so that the detection value is stabilized until the timing t12, but the detection value drops at the timings t13 and t14 at once until the thread 10 in the detection area 36 enters and joins the thread path in the detection area 36 moves, and defining the position in the thread path is terminated (taken in the thread path). The detection value drastically increases at time t15, which is immediately after the timing t14, and becomes larger than the thread presence / absence determination threshold. It is believed that the reason for this phenomenon is that, in the course of the introduction of the thread 10 in the detection area 36 , of the Light-receiving section 42 directly with light from the light projection section 41 is irradiated, and also irradiated with light, that of the light projection section 41 radiated and from the thread 10 is reflected, so that the detection value drops at once. When the detection value is made to transition as in 8th as shown, the detection values at the timings t13 and t14 in the memory section 57 but it is not appropriate to obtain the evaluation reference using the varying detection value. The setting section 58 Thus, the present embodiment calculates the evaluation reference value using the latest detection values until the detection timing three times back from the timing at which the determination is made that the thread exists, as described above. Thus, the unstable behavior of the detection value at the timing too close to the moment can be prevented from becoming the thread 10 occupies the position in the thread path, reflecting in the evaluation reference value.

Next, referring to the flowchart of FIG 9 a specific process described by the Justierabschnitt 54 , the capturing section 55 , the thread-present / missing-determining section 56 , the setting section 58 and the like of the thread monitoring control section 50 is performed.

The adjustment process, the measuring process and the like, which in 9 are shown, unlike the power-on the thread monitoring device 15 , executed every time the thread 10 is severed for some reason and in the detection area 36 the thread monitoring device 15 does not exist, and the thread connecting operation by the thread connecting device 14 is executed, and the thread 10 gets back into the detection area 36 introduced. A case in which the thread 10 is severed, includes a case in which the thread monitoring device 15 the thread defect finds and the thread 10 with the knife 16 cuts through a case where the bobbin 20 is completely unwound and the thread with the knife 16 is cut, and the like, as well as a case in which the thread break has occurred. Since the adjustment process and the measurement process are performed frequently as described above, the thread can 10 regardless of the environmental change, the adhesion of impurities to the light projecting portion 41 , the light receiving section 42 and the like of the thread monitoring device 15 and the like are stably monitored.

If the process of 9 is started without the thread 10 in the detection area 36 the thread monitoring device 15 exists, first the adjustment process by the Justierabschnitt 54 is executed, and becomes the driving voltage of the light projection section 41 in the sensor unit 35 as described above (step S101). After the adjustment process is completed, the iterative detection processes (steps S102 to S106) of the detection values by the detection section 55 started immediately.

In particular, the detection section controls 55 the sensor unit 35 to adjust the drive voltage adjusted in the adjustment process to the light projection section 51 and detects the detection value provided by the sensor unit 35 is currently output (the measurement process described above, step S102). Thereafter, the thread present / missing determination section determines 56 whether that from the capturing section 55 detected detection value is greater than or equal to the thread present / missing determination threshold or not (step S103). If the detection value is smaller than the thread presence / absence determination threshold, it is determined whether or not the detection value is greater than or equal to the normal range threshold (step S104). When the detection value is smaller than the normal range threshold, the detection value in the memory section becomes 57 is stored (S105), the process returns to step S102, and the detection of the detection value with the detection section is made 55 repeated again.

If, in the determination of S104, the detection value is greater than or equal to the normal range threshold, it is determined whether the detection section 55 the previously detected detection value is greater than or equal to the normal range threshold value or not (step S106). If both the detection value for this time and the detection value for the previous time are greater than or equal to the normal-range threshold value, it is assumed that an intolerable temperature drift has occurred, and thus the process returns to step S101, and the process becomes from the adjustment process of the adjustment section 54 run again. If, in the determination of S106, the detection value for this time is greater than or equal to the normal range threshold, but the detection value for the previous time is smaller than the normal range threshold, but the detection value for the previous time is smaller than the normal range threshold , the process (step S105) for storing the detection value in the memory section 57 and the process returns to S102, and becomes the detection value from the detecting section 55 recaptured.

If, in the determination of step S103, the detection value is greater than or equal to is the thread-present / missing-determination threshold, the setting process (step S107) of the evaluation reference value is set by the setting section 58 executed. In particular, the setting section selects and reads 58 from a plurality of detection values, in time series order in the memory section 57 are stored, a predetermined number of the most recent detection values detected before the timing that is a predetermined number of times back from the present time, and calculates their average value for detecting a new value of the evaluation reference value. The obtained value of the evaluation reference value is stored in the memory section 57 saved.

Thereafter, the winding of the thread 10 started, and evaluated the evaluation section 53 the course of the thread 10 through the detection area 36 based on the new value of the evaluation reference value (step S108).

According to the above processes, the evaluation section 53 the thread monitoring control section 50 the influence of the temperature drift and the like of the light projection section 51 can satisfactorily eliminate the condition of the thread 10 evaluate exactly.

Next is the control of the indicator light 46 described. The thread monitoring control section 50 controls / regulates the indicator light 46 so as to be off during the adjustment process of step S101, and to be lit in green during the measurement process of step S102 and the thread monitor of step S108. If in the thread monitoring device 15 an abnormality occurs, the thread monitoring control section performs 50 the controller so off that the indicator light 46 lights up in red. In other words, in the thread monitoring device 15 In the present embodiment, the indicator lamp 46 is controlled so that it has different display states during the adjustment process and during the measurement process, ie it is turned off during the Justierprozesses, and glows during the measurement process in green. The indicator light 46 is during the monitoring of the thread 10 and during the measuring process so controlled that the display state is the same, ie lights up in green. Further, when an abnormality occurs, the indicator lamp becomes 46 so driven that it lights up in red, which is a display state that differs from one of the display states during the adjustment process (off), the measurement process (lit in green), the thread monitor (lit in green). With the control of the indicator lamp described above 46 For example, the operator can check the condition and the like of the process performed in the thread monitoring device 15 is executed, easily recognize.

In the thread winding unit 10 In the present embodiment, the peeling operation can be performed by removing the fully wound bobbin 20 and attaching an empty reel spool 21 as described above, are performed manually by the operator. The peeling operation involves performing a thread pulling operation 10 from the Garnzuführabschnitt (not shown), guiding the thread 10 through the detection area 36 the thread monitoring device 15 , Attach from the end of the thread 10 on the empty reel spool 21 , and instructing the winding start to the thread winding unit 1 ,

However, if the operator carries out the peeling operation, the instruction to start winding the thread winding unit could 1 for some reason did not occur, even though putting the thread 10 to the thread monitoring device 15 and attaching the thread 10 at the winding spool 21 finished, and the thread 10 could be left for a long time.

In this case, although the evaluation reference value has been set using the detection value, immediately before the thread 10 in the detection area 36 the thread monitoring device 15 is introduced, along with the peeling operation, the thread monitoring control section 50 be in a situation where the monitoring of the thread 10 after that essentially can not be started and a long period of time expires. While remaining unaffected, a temperature drift that is too large to tolerate could be in the light projection section 41 have occurred. Even if the instruction for starting the winding is thereafter performed by the operator, it is not appropriate to thread 10 by means of the evaluation reference value set for that time as it is. As a condition where the thread 10 in the detection area 36 the thread monitoring device 15 is introduced, the old set value of the evaluation reference value can not be discarded to reset the setting.

To overcome these problems, the thread monitoring control section 50 configured in the present embodiment to determine if the thread is running 10 started or not by the evaluation section 53 that of the sensor unit 35 obtained detection value is continuously monitored after the thread-present / missing-determining section 56 has determined that the thread is present. The determination of whether the thread 10 is running or standing (hereinafter sometimes referred to as a run determination), for example based on the magnitude of the variation of the detection value received from the sensor unit 35 is obtained.

The stationary time counting section 59 the thread monitoring control section 50 is configured to increase by one a count value indicating the time elapsed in the steady state, as the result of the evaluation section 53 Running determination of the thread 10 is determined as stationary. The thread monitoring control section 50 performs a control to the knife 16 for cutting the thread 10 at that time (t95 time in in 10 shown example), to which the count has reached a predetermined value.

Thus, if a condition where the thread 10 in the detection area 36 exists, but the run start is not detected, continues for a predetermined time or longer, the thread becomes 10 forcibly cut, and the operator again carries out the peeling operation from the state where the thread 10 from the detection area 36 the thread monitoring device 15 is removed. Therefore, the opportunity for the thread monitoring control section 50 (Setting section 58 ) for resetting the evaluation reference value, and can accurately monitor the condition of the thread 10 will be realized.

As described above, the thread monitoring device includes 15 the present embodiment, the sensor unit 35 , the capturing section 55 , the setting section 58 and the evaluation section 53 , The sensor unit 35 outputs a detection value indicating the presence / absence of the thread 10 in the detection area 36 or the condition of the thread 10 equivalent. The detection section 55 detects the detection value in a state where the thread 10 does not exist in the detection area. The setting section 58 Sets the score reference value used to evaluate the condition of the yarn 10 is to be used based on at least one of a plurality of detection values obtained by repeating the detection of the detection value by the detection unit 55 be obtained until the thread 10 in the detection area 36 is introduced. The evaluation section 53 evaluates the condition of the thread 10 based on that of the setting section 58 set rating reference value.

Thus, by continuously and iteratively detecting the detection value, for example, that detection value can be obtained immediately before the thread 10 in the detection area 36 is introduced.

Thus, the influence of the temperature drift and the like is alleviated by defining the evaluation reference value using the detection value detected at the relevant timing. Therefore, the condition of the thread 10 be detected accurately.

The thread monitoring device 15 The present embodiment includes the thread-present / missing-determining section 56 , which is designed to determine whether the thread 10 in the detection area 36 is introduced or not. The setting section 58 sets the evaluation reference value based on the detection value acquired by the detection section 55 is detected before the thread present / missing determination section 56 that determines the thread 10 in the detection area 36 is introduced.

In other words, even if the detection value is detected after the thread 10 in the detection area 36 is introduced, such a detection value can not be used as the reference value, and therefore, using such a detection value, no suitable evaluation reference value can be set.

Furthermore, in the thread monitoring device 15 the present embodiment, the sensor unit 35 the light projection section 41 which is designed to project light into a space through which the thread runs 10 runs, and the light receiving section 42 which is adapted to that of the light projection section 41 to receive projected light and output an electrical signal corresponding to the light receiving amount. The thread monitoring device 15 contains the adjustment section 54 , The adjustment section 54 performs the adjustment process for adjusting the light projection amount of the light projecting portion 41 such that the detection value in the state where the thread 10 does not exist, coincides with a value (adjustment reference value) defined in advance.

In other words, the light projection amount of the light projection section 41 and the light receiving amount of the light receiving section 42 may vary due to environmental change such as temperature drift. Therefore, the reference value can be adjusted according to the environmental change by executing the adjustment process, and can the evaluation accuracy of the state of the thread 10 be stabilized.

The thread monitoring device 15 The present embodiment includes the memory section 57 which is adapted to store the normal range threshold and the thread present / missing determination threshold. The normal range threshold denotes a predetermined range with respect to the detection value in a state where the thread 10 by doing detection range 36 Does not exist. The thread present / missing determination threshold is a threshold for determining whether the thread 10 in the detection area 36 exists or not, and is a threshold that is greater than the normal range threshold. When immediately after the detection that the detection value is greater than or equal to the normal range threshold, the detecting section 55 detects the detection value that is greater than or equal to the normal range threshold and less than the thread presence / absence determination threshold, the adjustment section performs 54 the adjustment process.

In other words, if the thread 10 in the detection area 36 is introduced, that of the sensor unit varies 35 outputted detection value usually strong, and could be the detection section 55 detect the beginning of such a variation as the detection value. If the influence of the temperature drift is too large to be tolerated, the adjustment process is preferably carried out to adapt to the environmental change. In this regard, according to the configuration of the present embodiment, in the course of the multiple detection of the detection value by the detecting section 55 , the detection value that is greater than or equal to the normal range threshold value is obtained, and immediately thereafter the detection value that is greater than or equal to the normal range threshold and less than the thread detection determination threshold is obtained, as in t14 and t15 from 6 12, it is assumed that the detection value has increased by the influence of temperature drift, and therefore, the adjustment process is carried out. Thus, the adjustment process is performed only when necessary, whereby the influence of the temperature drift and the like can be accurately eliminated without decreasing the efficiency, and the state can be returned to the state where the state of the thread 10 through the evaluation section 53 can be accurately evaluated.

If in the thread monitoring device 15 In the present embodiment, the detection section 55 detects that the detection value is greater than or equal to the normal range threshold value, and detects immediately thereafter that the detection value is greater than or equal to the thread presence / absence determination threshold, the thread presence / absence determination section determines 56 that the thread is 10 in the detection area 36 located.

Thus, whether the thread 10 in the detection area 36 is introduced or not, can be determined with a simple process, while it is clearly distinguished from a case where, due to the influence of the temperature drift and the like, the detection value becomes greater than or equal to the normal-range threshold.

Further, in the thread monitoring device 15 the present embodiment of the detection section 55 detected detection value in the memory section 57 stored. The setting section 58 sets the evaluation reference value based on that in the memory section 57 stored detection value. However, if that of the detection section 55 When the detected detection value becomes greater than or equal to the normal-range threshold value, the storage of the detection value at the memory section becomes 57 stopped.

In other words, when the value outside a range which the value ordinarily occupies is detected as the detection value, it is not appropriate to use such a detection value for the calculation of the evaluation reference value. In this regard, it can be reliably prevented that the detection value that is greater than or equal to the normal range threshold value is used for the evaluation reference value by preventing the detection value that is greater than or equal to the normal range threshold value from being in the storage section 57 is stored.

Moreover, if in the thread monitoring device 15 In the present embodiment, the thread-present / missing-determining section 56 that determines the thread 10 in the detection area 36 is introduced, the setting section sets 58 the evaluation reference value based on the detection value obtained before the detection-value detection timing that is a predetermined number of times before the relevant determination.

In other words, during the course of threading 10 in the detection area 36 could be that of the sensor unit 35 outputted detection value show an unstable behavior. In this regard, in the present embodiment, by using the detection value before a timing that is a predetermined number of times before the time when the determination is made that the thread 10 in the detection area 36 is introduced, the evaluation reference value is set using an appropriate detection value from which the influence described above is eliminated.

In the thread monitoring device 15 the present embodiment sets the setting section 58 , as the evaluation reference value, the average value of the plurality of detection values acquired by the detection section 55 are recorded.

Thus, the variation of the individual detection value by different noise types is prevented from being reflected in the evaluation reference value, and the evaluation reference value can be suitably defined.

The thread monitoring device 15 The present embodiment includes the stationary time counting section 59 , The stationary time counting section 59 counts the time elapsed in a state where the thread is 10 in the detection area 36 is stationary. When the of the stationary time counting section 59 Counted expiration time exceeds a predetermined time, cuts through the thread monitoring device 15 the thread with the arranged in the thread monitoring device knife 16 ,

In other words, for example, a long period of time may be equal to that in the detection area 36 existing thread 10 In this case, the influence of the temperature drift and the like may become a problem, such as when the peeling operation is performed manually. Even if the setting value of the old evaluation reference value is discarded to reset the evaluation reference value, the detection value may be in a state where the thread 10 is not present, from the detection section 55 not be detected, since the thread 10 already in the detection area 36 exist. Therefore, the detection value becomes in a state where the thread 10 in the detection area 36 does not exist, by forcibly cutting the thread 10 recaptured so that the rating reference value can be reset.

Next, an alternative embodiment of the above-described embodiment will be described. In the description of this alternative embodiment, the elements which are the same or similar to those of the above-described embodiment are denoted by the same reference numerals in the drawings, and the description thereof can be omitted.

In the embodiment described above, the detecting section detects 55 iteratively the detection value until the thread present / missing determination section 56 that determines the thread 10 in the detection area 36 exist. In this alternative embodiment, a signal relating to time (hereinafter also sometimes referred to as a thread insertion timing) becomes the thread 10 in the detection area 36 is introduced by the unit control section 30 with respect to the thread monitoring control section 50 delivered.

In this alternative embodiment, the signal relating to the thread insertion timing is, in particular, a signal indicating a timing to which the first thread catching device 12 and the second thread catching device 13 the thread 10 to the thread connecting device 14 to lead. For example, the first thread catcher 12 and the second thread catching device 13 pivoted, as in the 1 to 3 shown to the thread 10 to the thread connecting device 14 but the signal representing the start timing of panning is supplied by the unit control section 30 to the thread monitoring control section 50 delivered. Usually, the timing to which the thread is 10 in the detection area 36 the thread monitoring device 15 is introduced, after a predetermined time from the start of the pivoting of the first thread-catching device 12 and the second thread catching device 13 , Therefore, the thread monitoring control section 50 predict the thread insertion timing by calculation.

The thread monitoring control section 50 determines the timing slightly before the thread insertion timing as the detection timing of the detection value. After completion of the adjustment process by the Justierabschnitt 54 the process waits until the detection timing, and when the detection timing occurs, the detecting section detects 55 that of the sensor unit 35 outputted detection value a predetermined number of times. The setting section 58 sets the average value of the detection values as the evaluation reference value.

Thereafter, that of the sensor unit 35 is outputted immediately after the predicted thread insertion timing, and this detection value is used to determine the presence / absence of the thread 10 through the thread present / missing determination section 56 used. It can be checked if the thread 10 as predicted, in the detection area 36 is introduced or not. When the run of the thread 10 is started, evaluates the evaluation section 53 the condition of the thread 10 , If a long period of time with the stationary thread 10 has expired, the thread becomes 10 with the knife 16 Forcibly cut, similar to the embodiment described above.

According to the above configuration, the detection value is detected immediately before the thread 10 in the detection area 36 is introduced, and the evaluation reference value can be set.

As described above, detected in the thread monitoring device 15 this alternative embodiment of the setting section 58 from the outside a time when the thread 10 in the detection area 36 and sets the evaluation reference value based on a plurality of the detection section 55 recorded data with a timing determined based on the detected time.

According to this configuration, the detection section 55 that of the sensor unit 35 outputted detection value, immediately before the thread 10 in the detection area 36 is introduced. Therefore, by defining the evaluation reference value using the detection value, the influence of the temperature drift and the like can be reduced, and the state of the thread can be reduced 10 be accurately evaluated.

The thread winding machine (thread winding unit 1 ) contains in this alternative embodiment, the thread monitoring device 15 , the winding section 18 , the thread connecting device 14 , the first thread-catching device 12 and the second thread catching device 13 , The winding section 18 wraps the thread 10 to form the bobbin 20 , The thread connecting device 14 executes the thread connection process. The first thread catching device 12 and the second thread catching device 13 lead the thread 10 to the thread connecting device 14 , The detection section 55 detects the detection value with the timing based on the timing to which the first thread catching device 12 and the second thread catching device 13 the thread 10 to the thread connecting device 14 to lead. The setting section 58 sets the evaluation reference value based on that of the detection section 55 measured detection value.

In other words, the thread 10 exists in the detection area 36 the thread monitoring device 15 not in a state where the thread 10 is severed, but the thread 10 gets into the detection area 36 introduced when the thread connecting operation of the thread connecting device 14 is performed. Therefore, the detection value is detected at the timing determined based on the timing to which the first thread catching device 12 and the second thread catching device 13 the thread 10 to the thread connecting device 14 so that the detection value just before the insertion of the thread 10 in the detection area 36 is rationally obtained and the evaluation reference value can be set. As a result, the influence of the temperature drift and the like can be effectively eliminated. Further, the number of detections of the detection value can be reduced, so that the burden of the computer can be reduced.

Above, the preferred embodiments and alternative embodiments of the present invention have been described, but the above-described configurations may be modified as follows.

In the above-described embodiment and the alternative embodiment, the evaluation reference value is calculated by obtaining an average of the detection value detected multiple times. However, the present invention is not limited thereto, and the setting portion 58 may set the detection value detected only once as it is as the evaluation reference value.

In the above-described embodiment, when the detection value that is greater than or equal to the normal-range threshold and less than the thread-present / missing-determination threshold is detected only once immediately after the detection value that is greater than or equal to is detected is within the normal range threshold (less than the thread present / missing determination threshold), the process is re-executed from the adjustment process. However, if the detection value that is greater than or equal to the normal range threshold and less than the thread present / missing determination threshold is detected for a predetermined number of times, the two-state may be the condition for re-executing the adjustment process or more times immediately after detecting the detection value that is greater than or equal to the normal range threshold.

In the embodiment described above, the detection value before the detection timing three times from the timing becomes the one with the thread presence / absence determination section 56 the determination is made that the thread exists, used for the calculation of the evaluation reference value. However, the number of timings to go back from the detection timing is not limited to three times, and may be suitably defined in view of the time interval for detecting the detection value and the like.

In the alternative embodiment described above, the detection of the detection value by the detecting section 55 at the timing determined based on the external information. However, also in the configuration of the alternative embodiment, the detecting portion 55 the detection value from immediately after the adjustment process by the Justierabschnitt 54 iteratively capture, similar to the embodiment described above. In this case, similar to the above-described embodiment, whether the detection value is greater than or equal to the normal range threshold is checked in real time to enable control to re-execute the adjustment process when the influence of the intolerable temperature drift occurs.

In the embodiment described above and the alternative embodiment, the thread monitoring device contains 15 the optical sensor unit 35 that the light projection section 41 and the light receiving section 42 having. Alternatively, the thread monitoring device may also include a capacitive sensor unit. The optical-type sensor unit and the capacitance-type sensor unit are similar in that the detection value indicative of the condition of the thread is output 10 corresponds (for example, cross-sectional shape or length of the fibers) in the detection area 36 exist. However, due to its characteristics, the capacitive thread monitor is more affected by the change in humidity than by the temperature drift. In this regard, the condition of the thread 10 can be monitored while effectively eliminating the influence of the humidity change by using the evaluation reference value using the detection value immediately before the thread is inserted 10 is set as in the embodiment and the alternative embodiment described above.

In the embodiment described above, the thread monitoring device 15 a configuration that the knife 16 contains. However, the present invention is not limited thereto, and the knife may also be outside the thread monitoring device 15 can be arranged, and the knife can from the unit control section 30 be controlled. In this case, the thread monitoring control section gives 50 the thread trimming signal to the unit control section 30 from, and the unit control section 30 drives the knife based on the thread trimming signal. When the present invention is applied to the spinning machine serving as the thread winding machine, the knife is not specially arranged, and the spinning operation of the spinning device is stopped to make the thread 10 to cut (that is, the spinning device also serves as a cutting device). Furthermore, the thread monitoring device 15 configured to thread the thread when the thread defect is detected with the knife 16 or other cutting device to eliminate the thread defect, but the thread monitoring device of the present invention may also be a device that only controls the state of the thread 10 monitored without the thread 10 with the knife 16 or other cutting devices.

An indicator showing the condition of the thread monitor 15 can, instead of the indicator light containing a two-color LED 46 , For example, also include a liquid crystal display and the like.

In the embodiment described above, the thread is 10 with light from the light projection section 41 irradiated, and the evaluation reference value is determined using the light receiving section 42 which receives the transmitted light, which is the light that is the thread 10 happened. However, the thread can 10 also with light from the projection screen 41 can be irradiated, and the evaluation reference value can be set by using the light receiving section which receives the reflected light which is from the thread 10 reflected light is.

The configuration of the present invention is not limited to the automatic winder, and may be applied to other types of thread winding machines, such as, for example, a spinning machine as described above. For example, when the configuration of the present invention is applied to the spinning machine, the pneumatic spinning device corresponds to the yarn feeding section. In the spinning machine, one (one set) of the thread connecting device and the thread catching and guiding device are preferably provided with respect to a plurality of thread winding units. In other words, a thread connecting carriage mounted with the thread connecting device and the thread catching and guiding device is provided with respect to a plurality of thread winding units, and is preferably configured to move along the direction in which the plurality of thread winding units are arranged are. However, a configuration of the spinning machine including only a thread connecting device for a thread winding unit may also be applied.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2013-204190 A [0003, 0005]
• JP 2013-203527 A [0003, 0005]
• JP 3707413 B2 [0003, 0005]

Claims (13)

Thread monitoring device ( 15 ), comprising: a detection section ( 35 ) configured to output a detection value indicating the presence / absence of a thread ( 10 ) in a detection area ( 36 ) and a condition of the thread ( 10 ) corresponds when the thread ( 10 ) in the detection area ( 36 exists; a detection section ( 55 ) adapted to detect the detection value when the thread ( 10 ) in the detection area ( 36 ) Does not exist; a setting section ( 58 ) which is designed to set an evaluation reference value which is used in the evaluation of the state of the thread ( 10 ) is to be used; and an evaluation section ( 53 ) designed to evaluate the condition of the thread ( 10 ) based on that of the setting section ( 58 ) and the reference value determined by the detection section ( 35 ) output detection value, characterized in that the setting section ( 58 ) sets the evaluation reference value based on at least one of a plurality of the detection values obtained by repeating the detection of the detection value by the detection section (12). 55 ) until the thread ( 10 ) in the detection area ( 36 ) is introduced. The thread monitoring device ( 15 ) according to claim 1, characterized by further comprising: a thread-present / missing-determining section ( 56 ) designed to determine whether the thread ( 10 ) at a predetermined position of the detection area (FIG. 36 ) exists or not, and whether the thread ( 10 ) in the predetermined position of the detection area ( 36 ) is inserted or not, the setting section ( 58 ) the evaluation reference value based on that of the detection section ( 55 ) detected detection value before the thread presence / absence determination section ( 56 ) determines that the thread ( 10 ) is introduced into the predetermined position. The thread monitoring device ( 15 ) according to claim 2, characterized in that the detection section ( 35 ) a light projection section ( 41 ) adapted to project light to the detection area (US Pat. 36 ), and a light receiving section ( 42 ) configured to receive the light projecting portion (Fig. 41 ) of projected light and outputting an electric signal corresponding to a light receiving amount, and the thread monitoring device ( 15 ) further comprises an adjustment section ( 54 ) configured to perform an adjustment process for adjusting a light projection amount of the light projecting portion (FIG. 41 ), such that the detection value when the thread ( 10 ) in the detection area ( 36 ) does not exist, corresponds to a predefined value. The thread monitoring device ( 15 ) according to claim 3, characterized in that it further comprises: a memory section ( 57 ) configured to store a first threshold for defining one of the boundaries of a predetermined area with respect to the detection value when the thread ( 10 ) in the detection area ( 36 ) and a second threshold for determining whether the thread is at the predetermined position of the detection area (FIG. 36 ), wherein the second threshold value is a value outside the predetermined range and is a value exceeding the first threshold value, and when immediately after detection of the detection value exceeding the first threshold value, the detection section (14) 55 ) detects the detection value between the first threshold and the second threshold for a predetermined number of times, which is one or more times, the adjustment portion (FIG. 54 ) performs the adjustment process. The thread monitoring device ( 15 ) according to claim 4, characterized in that, immediately after detection of the detection value exceeding the first threshold value, the detecting section (14) 55 ) detects the detection value exceeding the second threshold, the thread presence / absence determination section ( 56 ) determines that the thread ( 10 ) in the predetermined position of the detection area ( 36 ) is introduced. The thread monitoring device ( 15 ) according to claim 4 or 5, characterized in that that of the detection section ( 55 ) detected detection value in the memory section (FIG. 57 ), the setting section ( 58 ) the evaluation reference value based on that in the memory section ( 57 ) stored detection value when the thread ( 10 ) in the detection area ( 36 ) does not exist, and if the detection value is a value outside the predetermined range when the thread ( 10 ) not within the detection range ( 36 ), the detection value does not exist in the memory section (FIG. 57 ) is stored. The thread monitoring device ( 15 ) according to one of claims 2 to 6, characterized in that the setting section ( 58 ) sets the evaluation reference value based on the detection value obtained before a detection-value detection timing that is a predetermined number of times before a time when the thread-present / missing-determining section (15) 56 ) determines that the thread ( 10 ) in the predetermined position of the detection area ( 36 ) is introduced. The thread monitoring device ( 15 ) according to one of claims 2 to 7, characterized in that the setting section ( 58 ) an average value of the majority of the from the detection section ( 55 ) sets detected detection values for the evaluation reference value. The thread monitoring device ( 15 ) according to one of claims 1 to 8, characterized in that it further comprises: a counting section ( 59 ) designed to count an elapsed time in a state where the thread ( 10 ) in the detection area ( 36 ) is stationary, wherein, when the counting of the counting section ( 59 ) exceeds a predetermined time, the thread ( 10 ) with a in the thread monitoring device ( 15 ) arranged cutting device ( 16 ) or an external cutting device is cut. Thread monitoring device ( 15 ), comprising: a detection section ( 35 ) configured to output a detection value indicating the presence / absence of a thread ( 10 ) in a detection area ( 36 ) and a condition of the thread ( 10 ) corresponds when the thread ( 10 ) in the detection area ( 36 exists; a detection section ( 55 ) adapted to detect the detection value when the thread ( 10 ) in the detection area ( 36 ) Does not exist; a setting section ( 58 ) which is designed to set an evaluation reference value which is used in the evaluation of the state of the thread ( 10 ) is to be used; and an evaluation section ( 53 ) designed to evaluate the condition of the thread ( 10 ) based on that of the setting section ( 58 ) and the reference value determined by the detection section ( 35 ) output detection value, characterized in that the detection section ( 55 ) detects from the outside a time at which the thread ( 10 ) in the detection area ( 36 ), and detects one or a plurality of detection values at a timing determined based on the detected time, and the setting section (14 58 ) the evaluation reference value based on the one or the plurality of detection values detected by the detection section (12). 55 ) are detected at the predetermined timing. Yarn winding machine, characterized in that it comprises: the thread monitoring device ( 15 ) according to claim 10; a winding section ( 18 ) designed to wind a thread ( 10 ) for forming a wound body ( 20 ); a thread connecting device ( 15 ) configured to perform a yarn joining operation; and a thread catching and guiding device ( 12 . 13 ) designed to guide the thread ( 10 ) to the thread connecting device ( 14 ), the detection section ( 55 ) detects one or a plurality of the detection values at a timing determined based on a timing to which the thread catching and guiding apparatus ( 12 . 13 ) the thread ( 10 ) to the thread connecting device ( 14 ), and the setting section ( 58 ), as the evaluation reference value, the one detection value or an average value of the plurality of detection values detected by the detection section (FIG. 55 ) are detected at the predetermined timing. Thread winding machine, characterized in that it comprises: successively from upstream in the running direction of a thread ( 10 ), a thread feed section which is used to feed the thread ( 10 ) is designed; the thread monitoring device ( 15 ) according to any one of claims 1 to 10; and a winding section ( 18 ) designed to wind a thread ( 10 ) for forming a wound body ( 20 ). A thread monitoring method, comprising: detecting a value indicating the presence / absence of a thread ( 10 ) in a detection area ( 36 ) and a condition of the thread ( 10 ) corresponds when the thread ( 10 ) in the detection area ( 36 exists; Detecting the detection value when the thread ( 10 ) in the detection area ( 36 ) Does not exist; Setting an evaluation reference value used in the assessment of the condition of the thread ( 10 ) is to be used; and evaluating the condition of the thread ( 10 ) based on the evaluation reference value set in the setting step and the detection value output in the detection step, characterized by setting the evaluation reference value based on at least one of a plurality of the detection values detected by repeating the detection of the detection value until the thread ( 10 ) in the detection area ( 36 ) is introduced.

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