JP3500412B2 - Yarn clearer sensitivity adjustment device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn clearer sensitivity adjusting device for detecting a condition of a yarn to remove a defective portion.

[0002]

2. Description of the Related Art A yarn clearer provided in a spinning device or a bobbin winding device is equipped with a sensitivity adjusting device for stabilizing the sensitivity of a detector for detecting a yarn state. In the conventional sensitivity adjusting device, for example, as shown in FIG. 6, after the reference voltage φ for sensitivity adjustment is obtained based on the average output voltage of each unit or the output voltage of the sample unit, this reference voltage φ is entirely The detection sensitivity is stabilized by the following operation while being initially set and maintained in the comparator 53 of the unit.

That is, when the detection voltage is input from the yarn clearer detector 51 via the amplifier 52, the sensitivity adjusting device compares the detection voltage with the above-mentioned reference voltage φ by a comparator 53.
And the comparison signal indicating the comparison result is input to the up / down counter 54. Then, feedback control is performed in which the output data of the up / down counter 54 is increased / decreased at an increase / decrease speed set by the clock signal generator 55, and the light emission amount of the light emitting element 51a is increased / decreased by the drive voltage of the D / A converter 56. By
The detection sensitivity of the detector 51 is maintained at a predetermined detection sensitivity based on the reference voltage φ.

[0004]

However, as in the prior art described above, the reference voltage φ is determined based on the average output voltage of each unit or the output voltage of the sample unit, and this reference voltage φ is set and maintained in all units. However, in the configuration in which the control is performed, the reference voltage φ has the same fixed value state in all the units, so that variations in temperature change and temporal change occurring among the individual detectors 51 occur as error components, and as a result, the respective detectors 51 are changed. There is a problem in that it is difficult to detect the state of the yarn 50 with high accuracy.

Therefore, the present invention provides a yarn clearer sensitivity adjusting device capable of accurately correcting the detection sensitivity of each detector to detect the yarn state with high accuracy.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 is a yarn clearer sensitivity adjusting device having a detector for outputting a detection signal according to the state of the yarn, The detection signal of the detector is input, and a control unit that outputs the drive signal is provided, and the control unit calculates, for each yarn clearer, a yarn traveling reference value from an average value of the detection signal during yarn traveling. The drive signal is increased or decreased based on the result of comparing the detection signal with the yarn traveling reference value.

With the above arrangement, the control unit of the sensitivity adjusting device calculates the yarn traveling reference value for each yarn clearer, and corrects the drive signal of the detector of each yarn clearer based on this yarn traveling reference value. Therefore, even if different temperature changes or changes over time occur for each detector of the yarn clearer, the detection sensitivity of each detector can be accurately corrected, and as a result, the yarn state can be detected with high accuracy. .

According to a second aspect of the present invention, there is provided the yarn clearer sensitivity adjusting device according to the first aspect, wherein the control section detects the yarn traveling start and the yarn traveling start signal based on the yarn traveling start signal. And a renewal unit that renews the traveling reference value. According to the above configuration, the yarn traveling reference value is updated every yarn splicing operation, so that the correction due to the time-dependent change and temperature change of each yarn clearer is actually performed, and the reliability of the detection signal is further improved. .

According to a third aspect of the present invention, there is provided the yarn clearer sensitivity adjusting device according to the first or second aspect, wherein a pulse is provided in the control unit, and the result of comparison with the yarn traveling reference value is output as a pulse signal. It is characterized by having an output section, a first conversion section for converting the pulse signal into a voltage, and a second conversion section for converting the voltage into a current to be a drive signal for the detector. According to the above configuration, it is not necessary to provide a relatively expensive D / A converter among general circuit components, so that the sensitivity adjusting device can be configured at low cost.

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The yarn clearer sensitivity adjusting device according to the present embodiment is provided in a pneumatic spinning device, as shown in FIG. The spinning device includes a frame 1 having a U-shaped cross section. The frame 1 is formed in an elongated shape whose longitudinal direction is perpendicular to the paper surface, and a plurality of spinning winding units 30 are provided at equal intervals in the longitudinal direction of the frame 1. The spinning take-up unit 30 has a spinning section 2, a slack tube 27, a yarn clearer 3, a tensor device 5, and a winding section 4.

The spinning unit 2 is a spinning winding unit 30.
Is located on the most upstream side of the sliver S, and is configured to spin the yarn Y from the sliver S. Specifically, the draft part 12 including the back roller 9, the middle roller 10 and the front roller 11, the air spinning nozzle 13, and the roller pair including the delivery roller 14 and the nip roller 15 are provided in this order from the sliver S side. Has been done. The spinning unit 2 also includes a suction tube 16 arranged along the upper surface of the upper wall of the frame 1. Suction tube 16
Has one end opened at a position below the draft part 12 and the air spinning nozzle 13 so as to suck cotton wool or the like generated during spinning, while the other end is connected to a suction system (not shown).

A winding section 4 is located on the most downstream side of the spinning winding unit 30. The winding unit 4 includes a cradle 18 rotatably supported by a shaft 17, a friction roller 20 against which a package 19 is pressed by the cradle 18, and a variable speed drive motor 21 that rotates the package 19 via the friction roller 20. And have.

Between the spinning section 2 and the winding section 4, the slack tube 27 described above, the yarn clearer 3 for detecting the state of the yarn and removing the defective portion, and the yarn for the winding section 4 are provided. A tensor device 5 for bending the road is arranged in this order from the spinning section 2 side. And the above slack tube 2
7 are arranged along the lower surface of the upper wall of the frame 1, and are set so that the opening on the one end side faces the yarn Y. The other end of the slack tube 27 is connected to a suction device (not shown) via the suction main pipe 28, and the suction device sucks the yarn Y into the slack tube 27 during the yarn splicing operation to loosen the yarn. It seems to be resolved.

Further, the spinning device is provided with an automatic yarn joining device 7 (knotter) inside the frame 1. The automatic yarn joining device 7 has a carriage 8 placed on a guide rail 6 arranged in the longitudinal direction of the frame 1. The carriage 8 moves forward and backward along the guide rails 6 to enable the automatic yarn joining device 7 to be positioned at an arbitrary disposition position of the spinning winding unit 30. The carriage 8 is provided with a yarn pick-up nozzle 22 and a suction mouth 23, and a suction blower 24 for generating a suction air flow to the yarn pick-up nozzle 22 and the suction mouth 23. The yarn pick-up nozzle 22 is provided such that one end thereof is vertically rotatable. The yarn pick-up nozzle 22 is formed in a curved shape so that the opening on the other end side is located on the outlet side of the air spinning nozzle 13 when it is rotated to the upper limit position. This makes it possible to suck and hold the end of the yarn Y. Further, below the yarn pick-up nozzle 22, a yarn splicing member 25 that performs a yarn splicing operation on the yarn Y conveyed by the downward rotation of the nozzle 22 is arranged.

Further, the yarn pick-up nozzle 22 is provided with a cleaning nozzle 26 so as to rotate together with the yarn pick-up nozzle 22. The cleaning nozzle 26 is formed so that the opening on the other end side faces the yarn clearer 3 when the yarn pick-up nozzle 22 is rotated to the upper limit position. As shown in FIG. 3, an air ejecting device 31 is connected to one end of the cleaning nozzle 26, and the air ejecting device 31 ejects air from the opening of the cleaning nozzle 26 to the yarn clearer 3. It is designed to blow away dust and dust that has adhered to it.

As shown in FIG. 1, the yarn clearer 3 is provided in each spinning winding unit 30, and a detector 32 for detecting the thickness of the yarn Y spun in each spinning winding unit 30. And a cutter (not shown) that cuts the yarn Y. The detector 32 includes a light emitting unit 32a and a light receiving unit 32b, and outputs a voltage (current) corresponding to the amount of light received when the light output from the light emitting unit 32a is received by the light receiving unit 32b as a detection signal. Further, each spinning winding unit 30 includes a knotter detection unit 33 that detects that the automatic yarn joining device 7 (knotter) of FIG. 2 has arrived. The air ejecting device 31 supplies the ejected air from the fixed side through an air supply tube housed in a flexible cable together with electric system wiring.

The above-mentioned detector 32 and knotter detecting section 3
The number 3 is connected to a sensitivity adjusting device 34 provided in a ratio of one for the plurality of spinning take-up units 30. The sensitivity adjusting device 34 includes one microcomputer 35,
F / V of the number corresponding to the number of connections of the spinning winding unit 30
The converter 42 and the V / I converter 43 are provided. The microcomputer 35 includes a communication unit 36, a storage unit 37,
The calculation unit 38, the pulse output unit 39, the A / D conversion unit 40, and the I / O unit 41 are provided. The communication unit 36 is connected to the central control device 44, and enables various information data to be transmitted and received between the central control device 44 and the microcomputer 35.

The pulse output section 39 has a plurality of output terminals 39a that can be selected, and each output terminal 3a.
9a has a function of outputting a drive pulse at an arbitrary output frequency F. Each output terminal 39a of the pulse output unit 39
Is a light emitting unit of the detector 32 via an F / V conversion unit 42 that outputs a drive voltage corresponding to the output frequency F of the drive pulse and a V / I conversion unit 43 that outputs a drive current corresponding to the drive voltage. 32a. Further, the A / D converter 40 has a plurality of input terminals 40a that can be selected and has a function of converting an analog signal input to each input terminal 40a into a digital signal. The light receiving section 32b of the detector 32 is connected to each input terminal 40a of the A / D conversion section 40. Thereby, each detector 32 forms a feedback loop system with the sensitivity adjusting device 34, and the detection sensitivity is stabilized by the feedback control by the detection sensitivity adjusting routine of FIG. 4 described later.

Further, the I / O section 41 includes a plurality of input terminals 4
The input terminal 41a is connected to the above-mentioned knotter detection unit 33. In addition, the storage unit 37
It has a RAM section for temporarily storing the detection value S, the calculation result, and the like, and a ROM section for storing processing routines such as a detection sensitivity adjustment routine. Then, the calculation unit 38 is capable of executing the processing routine of the storage unit 37, and by performing the detection sensitivity adjustment routine, feedback control is performed so as to stabilize the detection sensitivity of the detector 32, and
Based on the detection value S from the detector 32, abnormality determination for detecting a yarn defect is performed. The detection sensitivity adjustment process is performed at a longer cycle than the yarn defect detection process.

The operation of the sensitivity adjusting device 34 having the above structure will be described. As shown in FIG. 2, when the spinning device is started to spin the yarn Y from the spinning part 2 such as the draft part 12 and the air spinning nozzle 13, the yarn Y is spun by the yarn clearer 3. After the Y state is detected, it is sent to the winding section 4 via the tensor device 5, and then wound around the package 19 of the winding section 4. When spinning is started in this way, the sensitivity adjustment of the yarn clearer 3 by the sensitivity adjusting device 34 is started as shown in FIG. The tensor device 5 is necessary when the winding unit 4 winds the cone-shaped package 19 having the large diameter portion and the small diameter portion, but in the case of the cheese-shaped package 19 having the same diameter at both ends, It can be omitted.

That is, the sensitivity adjusting device 34 reads out the detection sensitivity adjusting routine of FIG. The adjustment routine is executed independently for each spinning winding unit 30 connected to the sensitivity adjusting device 34 while time-sharing. Therefore, since each spinning take-up unit 30 has the same apparent appearance as that connected to each sensitivity adjusting device 34, the detection sensitivity adjustment for a specific spinning take-up unit 30 will be made in the following description. A case of executing a routine will be described.

When the detection sensitivity adjustment routine is executed, it is determined whether the yarn traveling signal is on, that is, whether the yarn Y is traveling (S1). When the yarn Y is traveling (S1, YES), the yarn traveling reference value φAVEn is determined by executing the yarn traveling reference value determination processing. Specifically, the yarn traveling reference value determination processing routine of FIG. 5 is executed, and after the yarn traveling is started, until a predetermined time that is supposed to eliminate the influence of the slack tube 27 of FIG. 2 on the yarn Y elapses. stand by. The reason for waiting is that the tension of the yarn Y is low until the yarn Y completely comes out of the slack tube 27, so that the yarn Y state is often detected as thicker than usual (S21).

When the above predetermined time has elapsed, the light receiving section 32
The detection value S of the digital amount, which is input from b through the A / D conversion unit 40, is fetched at regular sampling intervals and sequentially stored in the storage area of the storage unit 37, thereby sampling the detection value S ( S22). Then, the detection value S of a fixed number of samplings from the storage area for one block
Is read out and the total value of these detected values S is divided by the number of samplings and averaged to calculate the current yarn traveling reference value φAVEn used during the subsequent yarn traveling (S23).

Thereafter, when the yarn traveling reference value φAVEn is updated, if there is a large difference between the current yarn traveling reference value φAVEn and the previous yarn traveling reference value φAVEn, the current yarn traveling reference value Since there is a high possibility that φAVEn contains a large error component, the latest yarn traveling reference value φAVEn is taken into consideration by taking into account the yarn traveling reference value φAVEn for the previous time by a predetermined weight so as to minimize this error component. Weighting correction to be calculated is performed (S
24). Then, the arithmetic unit 38 is caused to perform an abnormality determination (different count detection) based on the weight-corrected yarn traveling reference value φAVEn. The condition for performing the weighting correction and the weighting of the yarn traveling reference value φAVEn for the previous time when performing the weighting correction can be changed. Sensitivity adjustment device 34
The yarn traveling reference value φAVEn calculated in
Is transmitted to the central control unit 44 via (S25). The central controller 44 calculates the average of the received yarn traveling reference values φAVEn for a plurality of units. This average value is transmitted to all the sensitivity adjusting devices 34, and the first yarn traveling reference value φ
The unit 30 for which AVEn is not fixed is used for abnormality determination (detection of different count, determination of yarn defect) and as a yarn traveling reference value for the previous time.

After that, the process returns to the detection sensitivity adjustment routine of FIG. 4, and it is determined whether the yarn Y is running (S).
3). If the yarn Y is running (S3, YES), the detection value S obtained by digitizing the detection signal of the light receiving section 32b of the detector 32 is sequentially stored in the storage section 37 by the same operation as described above, and sampling is performed ( S4). Then, while the sampling of the detection value S is continued, the detection value S of a fixed number of samplings is read from the storage area for one block corresponding to the previous correction processing to the current correction processing, and the total of these detection values S is read. The average value Save is calculated by dividing the value by the sampling number and averaging (S5).

Thereafter, the average value Save is compared with the total value (φAVEn + OS) obtained by adding the offset value OS to the yarn traveling reference value φAVEn obtained in S2 (S6). If the average value Save is greater than or equal to the total value (φAVEn + OS) (S
6, YES), the detection sensitivity of the detector 32 is set to the yarn traveling reference value φ.
If the average value Save is less than the total value (φAVEn + OS) (S6, NO), the detector 32 of the detector 32 The minus side φ correction processing is performed to obtain the output frequency F for correcting the detection sensitivity to the lower limit value or more based on the yarn traveling reference value φAVEn (S8).

Thereafter, the drive pulse having the output frequency F set in S7 and S8 is output from the pulse output unit 39,
The drive current corresponding to the output frequency F of the drive pulse is detected by the detector 32 via the F / V converter 42 and the V / I converter 43.
Is supplied to the light emitting section 32a. Then, the detection sensitivity of the detector 32 is adjusted by causing light to be emitted from the light emitting unit 32a with a light emission amount according to the drive current, and to be received by the light receiving unit 32b via the yarn Y (S9). After this, S3 is re-executed, and if the yarn Y is traveling (S3, YES), the detection value S for the next one block is read (S4), the average value Save of these detection values S and the yarn traveling The adjustment of the detection sensitivity based on the reference value φAVEn is repeated (S3 to S9).

Next, as in the case where the yarn defect is detected in the calculation unit 38 and the yarn joining command signal for cutting the yarn Y and performing the yarn joining is output, the traveling of the yarn Y is stopped in S3. If it is determined that the result is (S3, NO), the detector 3
A yarn dead time sensitivity adjustment process of adjusting the drive signal of No. 2 and adjusting the output of the light receiving unit 32b to the offset value OS which is the yarn dead time reference value is performed. First, it is again determined whether the yarn Y is running (S1), and if the yarn Y is not running (S1).
1, NO) and the detection value S from the detector 32 are sequentially stored in the storage unit 3
7, and sampling is performed (S10). And
While continuing the sampling of the detection value S, the detection value S of a constant sampling number is read from the storage area for one block corresponding to the predetermined length of the yarn Y, and the total value of these detection values S is divided by the sampling number. Then, the average value Save is calculated by averaging (S11).

Thereafter, the average value Save and the offset value OS are compared (S12). If the average value Save is equal to or greater than the offset value OS (S12, YES), the detection sensitivity of the detector 32 is based on the offset value OS. Then, the + side 0 correction process is performed to obtain the output frequency F to be corrected below the upper limit value (S13),
If the average value Save is less than the offset value OS (S12,
NO), the negative side correction process is performed to obtain the output frequency F that corrects the detection sensitivity of the detector 32 to the lower limit value or more with the offset value OS as the reference (S14).

Thereafter, the drive pulse having the output frequency F set in S13 and S14 is output from the pulse output unit 39, and the drive pulse output frequency F is output via the F / V conversion unit 42 and the V / I conversion unit 43. By supplying a drive current corresponding to the light emitting section 32a of the detector 32 to the detector 3
The detection sensitivity of 2 is adjusted (S15). After this, S1 is re-executed, and if the yarn Y is stopped (S1, NO), the next 1
The detection value S for the block is read (S10), and the adjustment of the detection sensitivity based on the average value Save of these detection values S and the offset value OS is repeated (S1 · S10 to S15).

The yarn Y is present in the detector 32 in the + side 0 correction process of S13 and the-side 0 correction process of S14 which are repeatedly executed while the yarn Y is stopped as described above. Since it is performed in a state where there is no thread, from when the yarn Y is cut by the automatic yarn joining device 7 until the yarn joining is completed,
It is necessary to rapidly adjust the detection sensitivity of the detector 32 to the standard of the offset value OS. Therefore, short-period rapid correction is performed until the offset value OS of the average value Save exceeds. During this yarn splicing operation, as shown in FIG. 3, when the yarn pick-up nozzle 22 is moved upward to hold the yarn Y, air is detected from the cleaning nozzle 26 by the detector 32.
A cleaning process is performed in which the particles are ejected to blow away dust and the like, but there is a certain time (for example, 5 seconds) before the completion of yarn splicing after the cleaning process.

Thus, the sensitivity adjusting device 34 can adjust the sensitivity of the detector 32 based on the offset value OS by repeatedly executing S10 to S15 when the yarn Y is not running. On the other hand, when the yarn Y is running, by repeating S2 to S9, at least every yarn joining operation, that is, the yarn Y.
It is possible to adjust the sensitivity of the detector 32 based on the yarn traveling reference value φAVEn which is updated every time the traveling of the yarn starts. In the calculation unit 38, the presence or absence of yarn traveling is determined based on the detection value S, the yarn traveling start after the completion of yarn splicing is detected, and the yarn traveling reference value φAVEn is updated based on the yarn traveling start signal. Sampling of the detected value to start is started.

As described above, the sensitivity adjusting device 34 of the present embodiment, as shown in FIG. 1, includes the detector 32 that outputs the detection signal according to the state of the yarn Y with the detection sensitivity according to the drive signal. A microcomputer 35 that adjusts the detection sensitivity, receives a detection signal, and outputs a drive signal.
The microcomputer 35 has a (control unit), and the detection value S (detection signal) at the time of yarn traveling for each yarn clearer 3 is provided.
The yarn traveling reference value φAVEn is calculated from the average value of the above, and the drive signal is increased / decreased based on the result of comparing the detected value S with the yarn traveling reference value φAVEn.

In this embodiment, one microcomputer 35 controls the detectors 32 of the plurality of yarn clearers 3 in a time-division manner. However, the present invention is not limited to this, and the microcomputer 35 may be used. If the processing speed is low, one microcomputer 35 may control the detector 32 of one yarn clearer 3.

As a result, the microcomputer 35 calculates the yarn running reference value φAVEn for each yarn clearer 3,
Each yarn clearer 3 based on this yarn running reference value φAVEn
Since the drive signal of the detector 32 of No. 3 is corrected, the detection sensitivity of each detector 32 can be accurately corrected even if different temperature changes or changes over time occur for each detector 32 of the yarn clearer 3. As a result, the state of the yarn Y can be detected with high accuracy.

Further, the microcomputer 35 described above is used.
Is configured to include a detection unit that detects the start of yarn traveling and an updating unit that updates the yarn traveling reference value φAVEn based on the yarn traveling start signal and the detected value S. As a result, the correction due to the change with time or the change in temperature of each yarn clearer 3 is actually performed, and the reliability of the detection signal is further improved.

Further, the sensitivity adjusting device 34 is provided in the microcomputer 35, and the yarn running reference value φAVEn
Pulse output unit 3 that outputs the result of comparison with the pulse signal
9, and an F / V converter 42 for converting the pulse signal into a voltage
It is configured to include a (first conversion unit) and a V / I conversion unit 43 (second conversion unit) that converts a voltage into a current to generate a drive signal. Accordingly, it is not necessary to provide a relatively expensive D / A converter among general circuit components, so that the sensitivity adjusting device can be configured at low cost.

When updating the yarn traveling reference value φAVEn,
Since the previous yarn running reference value φAVEn is also weighted and corrected with a predetermined weight, it is possible to prevent a rapid change in the yarn running reference value φAVEn based on the abnormal detection value S, and to detect a yarn defect based on the yarn running reference value φAVEn. Can be done accurately.

[0039]

According to a first aspect of the present invention, there is provided a yarn clearer sensitivity adjusting device having a detector for outputting a detection signal according to a yarn state, wherein the detection signal of the detector is input.
A control unit that outputs the drive signal is provided, and the control unit calculates, for each yarn clearer, a yarn traveling reference value from an average value of the detection signals during yarn traveling, and outputs the detection signal as the yarn traveling reference. The drive signal is increased or decreased based on the result of comparison with the value.

According to the above construction, the control section of the sensitivity adjusting device calculates the yarn traveling reference value for each yarn clearer, and corrects the drive signal of the detector of each yarn clearer based on this yarn traveling reference value. Therefore, even if different temperature changes or changes over time occur for each detector of the yarn clearer, the detection sensitivity of each detector can be accurately corrected, and as a result, the yarn state can be detected with high accuracy. Has the effect.

According to a second aspect of the present invention, in the yarn clearer sensitivity adjusting device according to the first aspect, the control section detects the yarn traveling start and the yarn traveling start signal based on the detecting section. And a updating unit that updates the traveling reference value. According to the above configuration, the yarn traveling reference value is updated for each yarn splicing operation, so that the correction due to the change with time or the change in temperature for each yarn clearer is actually made, that is,
Even if there is a change over time or a change in temperature, the yarn traveling reference value that is the target of sensitivity correction can always be maintained at an appropriate value, and the reliability of the detection signal can be further improved.

According to a third aspect of the present invention, there is provided the yarn clearer sensitivity adjusting device according to the first or second aspect, wherein a pulse is provided in the control unit, and the result of comparison with the yarn traveling reference value is output as a pulse signal. The configuration includes an output unit, a first conversion unit that converts the pulse signal into a voltage, and a second conversion unit that converts the voltage into a current to be a drive signal for the detector. According to the above configuration, it is not necessary to provide a relatively expensive D / A converter among general circuit components, so that the sensitivity adjusting device can be configured at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram of a sensitivity adjusting device.

FIG. 2 is a side sectional view of the spinning device.

FIG. 3 is a perspective view of a main portion of the spinning winding unit.

FIG. 4 is a flowchart of a detection sensitivity adjustment routine.

FIG. 5 is a flowchart of a yarn traveling reference value determination processing routine.

FIG. 6 is a circuit diagram of a conventional sensitivity adjusting device.

[Explanation of symbols]

1 frame 2 spinning department 3 yarn clearer 4 winding section 5 Tensor device 6 Guide rail 7 Automatic yarn splicing device 8 carts 13 Air spinning nozzle 16 suction tube 17 axes 20 Friction roller 22 Thread pick-up nozzle 23 Suction Mouse 24 suction blower 25 Thread splicing member 26 Cleaning nozzle 27 slack tubes 28 Main suction 30 Spinning winding unit 31 Air ejection device 32 detectors 32a light emitting unit 32b light receiving section 33 Knotter detector 34 Sensitivity adjustment device 35 Microcomputer 39 Pulse output section 40 A / D converter 41 I / O section 42 F / V converter 43 V / I converter 44 Central control unit

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-63-282061 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 63/06 D01H 13/22

Claims (3)

(57) [Claims] 1. A sensitivity adjusting device for a yarn clearer, comprising a detector for outputting a detection signal according to a yarn state, comprising:
The detection signal is input, and a control unit that outputs a drive signal of the detector is provided, and the control unit calculates a yarn traveling reference value from an average value of the detection signal during yarn traveling for each yarn clearer. The sensitivity adjusting device of the yarn clearer is characterized in that the drive signal is increased or decreased based on a result of comparing the detection signal with the yarn traveling reference value. 2. The control unit includes a detection unit that detects the start of yarn traveling and an updating unit that updates the yarn traveling reference value based on the yarn traveling start signal. Yarn clearer sensitivity adjustment device described. 3. A pulse output unit, which is provided in the control unit, outputs a result of comparison with the yarn traveling reference value as a pulse signal, a first conversion unit that converts the pulse signal into a voltage, and the voltage is a current. Second, which is converted into a drive signal for the detector
3. The yarn clearer sensitivity adjusting device according to claim 1, further comprising a conversion unit.