JPH06228833A - Sensor for detecting yarn breakage of spinning machinery - Google Patents

Abstract

PURPOSE:To eliminate the need for ensuring a new space for installing a yarn breakage detecting sensor for detecting the presence of yarn breakage for each spindle in a real-time system so as to automatically regulate an air gap in a magnetic circuit to a proper state in regulating a clearance of a traveler clearer. CONSTITUTION:A yarn breakage detecting sensor 1 is integrated with a traveler clearer 2, made of a magnetic material and equipped with a clearer body (2a) and a pair of blade parts (2b) branched from the tip thereof to the right and left. A permanent magnet 4 is secured to the undersurface of the clearer body (2a). A respectively independent pickup coil 5 is wound around each blade part (2b). The traveler clearer 2 in a state of the permanent magnet 4 in contact with the surface of a ring rail 7 is fixed to the ring rail 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn breakage detecting sensor for a spinning machine such as a ring spinning machine and a ring twisting machine, and more specifically, a yarn for a spinning machine which detects the presence or absence of a yarn by utilizing an electromagnetic induction effect of traveling of a traveler. The present invention relates to a breakage detection sensor.

[0002]

2. Description of the Related Art A yarn breakage detecting device of this type is disclosed in Japanese Patent Laid-Open No.
JP-A-3-58035 discloses a device in which a detector including a magnetic core wound by a winding is provided so as to be movable along a guide rail fixed on a ring rail.
In this device, one detector is moved along the guide rail in order to suppress an increase in cost when a detector is provided for each weight. The detectors are sequentially arranged at positions corresponding to the weights, and the presence or absence of yarn breakage is determined based on the induced voltage generated in the winding when the traveler passes near the magnetic core.

Further, in Japanese Utility Model Laid-Open No. 60-23322,
Disclosed is a device in which a separator is provided with a yarn breakage detection head including an electromagnetic detector that detects the presence or absence of yarn breakage by utilizing the electromagnetic induction effect of traveling of a traveler, and an amplifier that amplifies a signal from the detector. Has been done.

Further, in a ring spinning machine or the like, since the yarn is moved while being handled by a traveler and wound around a bobbin,
The fibers that are not completely twisted into the yarn come out of the yarn and adhere to the traveler while straddling it. If you leave this state, the tufted fibers leave the traveler and jump into the thread,
The yarn quality is reduced. To prevent this, the ring rail is equipped with a traveler clearer. The traveler clearer has a blade and its cutting edge cuts and removes fibers and cotton wool attached to the traveler when they do not grow much. Then, the fixed position of the traveler clearer is accurately adjusted so that the interval between the edge (cutting edge) of the blade and the rotation locus of the traveler has a predetermined value. In addition, the size of the traveler may be changed depending on the thickness of the spun yarn, and the fixed position of the traveler clearer is adjusted along with the change in the size of the traveler.

[0005]

Problems to be Solved by the Invention JP-A-53-5803
In the device disclosed in Japanese Patent No. 5 publication, one detector moves on the ring rail to detect the thread breakage of each weight, and therefore it is not possible to continuously detect the presence or absence of thread breakage in each weight. Also, the interval for detecting thread breakage of the same weight becomes relatively long. This is because it is premised that there is no problem even if the presence or absence of yarn breakage of each weight is intermittently detected at predetermined time intervals without continuously monitoring all weights from the statistical analysis in the spinning factory. is there. When the operating speed of the machine base was relatively low, the presence or absence of thread breakage of each weight was intermittently detected in this way, and there was no problem even if the interval was relatively long. However, due to the increase in operating speed of the machine base, such a premise is not always correct, and a large amount of cotton is wastefully discharged at the yarn breakage weight.

On the other hand, the device disclosed in Japanese Utility Model Laid-Open No. 60-23322 has a problem that a special separator having a storage space for accommodating a detector is required.
Further, since the detector is built in the separator, the distance between the magnetic core and the rotation locus of the traveler becomes large, and an amplifier for amplifying the detection signal is required.

In order to increase the sensitivity of the detector, it is preferable that the tip of the magnetic core is located near the rotation locus of the traveler.
On the other hand, the size of the traveler may be changed depending on the thickness of the spun yarn, and the range of the rotation locus of the traveler changes with the change in the size of the traveler. Therefore, it is preferable to adjust the tip position of the magnetic core according to the change in the size of the traveler. However, it is troublesome to perform such adjustment for each weight only for the purpose of increasing the sensitivity of the detector.

The present invention has been made in view of the above problems, and an object thereof is to secure a new space for mounting a yarn breakage detecting sensor for detecting the presence or absence of yarn breakage for each weight in real time. It is an object of the present invention to provide a yarn breakage detection sensor for a spinning machine, which does not require the clearance adjustment of the traveler clearer and can automatically adjust the air gap of the magnetic circuit to an appropriate state.

[0009]

In order to achieve the above-mentioned object, the present invention utilizes the electromagnetic induction action of a traveler made of a magnetic material that rotates on a ring made of a magnetic material to cross a magnetic circuit. In a yarn breakage detection sensor of a spinning machine that detects the presence or absence, a traveler clearer mounted on a ring rail so that the fixed position can be adjusted is used as a magnetic core, and the traveler clearer is provided with a magnetizing means for magnetizing the magnetic core, and the magnetic core is picked up. The coil was wound.

The magnetizing means is preferably a permanent magnet fixed to the clearer body. Further, it is preferable that the traveler clearer includes a clearer main body having two common spindles and a blade portion branched left and right from the clearer main body, and an independent pickup coil is wound around each blade portion.

A power supply for supplying a predetermined current may be connected to the pickup coil so that the pickup coil also serves as a magnetizing means.

[0012]

The traveler clearer is magnetized by the magnetizing means to become a magnetic core, and a part of the ring flange serving as a travel path of the traveler becomes a part of a magnetic circuit formed by a magnetic flux passing through the magnetic core. As the traveler moves over the ring flange and traverses the magnetic circuit, the magnetic flux in the magnetic circuit changes. The change in magnetic flux induces a voltage in the pickup coil in proportion to the number of turns of the coil. Then, a pulse voltage synchronized with the rotation of the traveler is generated at both ends of the pickup coil, and the presence or absence of yarn breakage is detected based on the voltage at both ends of the pickup coil. The air gap of the magnetic circuit is the distance between the blade tip of the traveler clearer and the ring flange. When the clearance of the traveler clearer is adjusted to the optimum value corresponding to the traveler size, the air gap is automatically adjusted to the appropriate value.

Further, when a permanent magnet is used as the magnetizing means of the magnetic core, no power supply is required, and the construction becomes simpler. In addition, the traveler clearer is configured to include a clearer main body having two common spindles and a blade portion branched left and right from the clearer main body, and when an independent pickup coil is wound around each blade portion, one traveler clearer is provided. With this, thread breakage of two spindles can be detected, and the manufacturing cost of the thread breakage detection sensor per spindle decreases.

When the pickup coil is supplied with a predetermined current, the magnetic circuit is formed by the current supplied from the power supply to the pickup coil. Therefore, it is not necessary to separately provide a magnetizing solenoid or a permanent magnet on the traveler clearer, and the configuration is simplified.

[0015]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS.
The thread breakage detection sensor 1 is integrated with the traveler clearer 2. The traveler clearer 2 is formed of a plate material made of a magnetic material, and includes a clearer main body 2a and a pair of blade portions 2b branching left and right from the tip of the clearer main body 2a. Both blade portions 2b are bent upward at a right angle to the clearer main body 2a, and are formed so as to extend outwardly from each other, and cutting edges are formed at their tips. A slot 3 is formed near the base end of the clearer body 2a so as to extend in the longitudinal direction of the clearer body 2a.

The traveler clearer 2 also serves as a magnetic core, and a permanent magnet 4 as a magnetizing means for magnetizing the magnetic core is fixed to the lower surface of the clearer main body 2a. Permanent magnet 4 is S
The poles are fixed so that they are on the ring rail 7 side. An independent pickup coil 5 is wound around each blade portion 2b. Both ends of each pickup coil 5 are output terminals and are connected to the determination device 6.
The traveler clearer 2 (magnetic core), the permanent magnet 4, and the pickup coil 5 constitute a yarn breakage detection sensor 1. The determination device 6 is configured to determine the presence or absence of yarn breakage based on the output signal from the yarn breakage detection sensor 1, that is, the output signal from the pickup coil 5.

A screw hole 7a (shown only in FIG. 3) is formed at a predetermined position on the front side (lower side in FIG. 1) of the ring rail 7. The traveler clearer 2 is fixed on the ring rail 7 by a screw 9 so as to extend in a direction orthogonal to the longitudinal direction of the ring rail 7 between adjacent rings 8 provided on the ring rail 7. As shown in FIG. 3, a packing 10 made of a non-magnetic material is interposed between the lower surface of the clearer main body 2 a and the upper surface of the ring rail 7, and the traveler clearer 2 has the permanent magnet 4 on the upper surface of the ring rail 7. It is fixed in contact. The screw 9 is also made of a non-magnetic material.

Next, the operation of the device configured as described above will be described. Permanent magnet 4 fixed to the back of the clearer body
By the action of, the magnetic circuit 11 constituted by the magnetic flux from the north pole to the south pole of the permanent magnet 4 is formed in the traveler clearer 2, the ring rail 7, and the ring 8. Since the traveler clearer 2 is fixed to the ring rail 7 via the screw 9 and the packing 10 made of a non-magnetic material, most of the magnetic flux passes through both the blade portions 2b toward the ring flange 8a. Then, it returns to the S pole of the permanent magnet 4 through a part of the ring 8 and the ring rail 7. Therefore, as shown in FIG. 4, the traveler clearer 2 is formed with two magnetic circuits 11 passing through a part of the ring flanges 8 a of the adjacent rings 8.

When the spinning yarn 12 rotates with the rotation of the spindle (not shown) during the spinning operation, the traveler 13 moves on the ring flange 8a at a speed corresponding to the rotation speed of the spinning yarn 12 unless the yarn is in a broken state. Rotate. And the traveler 1
Each time 3 rotates once on the ring flange 8a, it crosses the magnetic circuit 11 once. Traveler 13 is magnetic circuit 1
When crossing 1, the magnetic flux φ of the magnetic circuit 11 changes, and a voltage V shown by the following equation proportional to the number of turns N of the coil is induced in the pickup coil 5.

V = N (dφ / dt) Therefore, if the yarn is not broken, a pulse voltage synchronized with the rotation of the traveler 13 appears at both ends of the pickup coil 5, and the voltage is kept constant (0V) in the yarn broken state. To be done.
If the pulse voltage is output from both ends of the pickup coil 5, the determination device 6 determines that the spinning is normal, and if the pulse voltage is not output, the determination device 6 determines that the yarn is broken and outputs a yarn break signal. Further, by counting the number of pulses per unit time output from the pickup coil 5 by the determination device 6, the rotation speed of the traveler 13, that is, the rotation speed of the yarn 12 can also be calculated.

The number of turns of the pickup coil 5 is 1
50 and the spindle rotation speed is about 18000 rpm
FIG. 5 shows the result of measurement of the change in the output voltage of the pickup coil 5 when the vehicle is operated at. From the pickup coil 5 corresponding to the two adjacent weights (shown by (A) and (B) in FIG. 1), a pulse voltage was output at approximately 3.3 msec intervals. The output signal from the pickup coil 5 could be sufficiently detected without amplification. In addition, as for the cells on the horizontal axis in FIG. 5, one cell is 2 msec.

The traveler clearer 2 reliably removes the fibers adhering to the traveler 13 from the traveler 13 before it grows so much that the clearance between the cutting edge and the traveler 13 is strictly controlled, and it corresponds to the size of the traveler 13. The fixed position is adjusted. The traveler clearer 2 is fixed so that the cutting edge does not interfere with the traveler 13 and the position is as close to the rotation locus of the traveler 13 as possible.
Therefore, the distance between the cutting edge and the ring flange 8a, that is, the air gap of the magnetic circuit 11 is automatically set to the minimum value under the spinning condition, and the sensitivity of the yarn breakage detection sensor 1 is adjusted to a good state.

Since the thread breakage detection sensor 1 is integrated with the traveler clearer 2, it is not necessary to secure a new space for mounting the thread breakage detection sensor 1. When attaching (retrofitting) the thread breakage detection sensor 1 to a spinning machine that is already in use, it is sufficient to replace the previously used traveler clearer with the thread breakage detection sensor 1, and to modify the machine body. Does not need

Further, in this embodiment, since the permanent magnet 4 is used as the magnetizing means, the power source for the sensor is not required, the structure is simple and the cost is low. Also, since one traveler clearer 2 can detect the presence or absence of thread breakage of two weights,
The cost of the thread breakage detection sensor 1 per spindle becomes lower.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. In this embodiment, a solenoid coil is used instead of the permanent magnet as the magnetizing means of the traveler clearer 2, which is a great difference from the device of the above embodiment. The solenoid coil 14 is wound around the central portion of the clearer main body 2a. The solenoid coil 14 is connected to an external power supply (not shown). The external power supply may be a DC power supply or an AC power supply. The screw 9 is made of a magnetic material.

In this embodiment, an electric current is supplied to the solenoid coil 14 from an external power source so that the traveler clearer 2
Is magnetized. Further, the ring flange 8a of the adjacent ring 8 is provided on the traveler clearer 2 as in the above embodiment.
Two magnetic circuits 11 that pass through a part of are formed. However, unlike the above embodiment, the magnetic flux passes through the screw 9 and returns from the ring rail 7 to the traveler main body 2a.

Therefore, the pulse voltage is output from the pickup coil 5 every time the traveler 13 rotating on the ring flange 8a crosses the magnetic circuit 11 as in the above embodiment. Then, based on the presence or absence of the output of the pulse voltage from the pickup coil 5, the determination device 6 determines the presence or absence of yarn breakage.

(Third Embodiment) Next, a third embodiment will be described with reference to FIGS. This embodiment is largely different from the device of the second embodiment in that the pickup coil also serves as a solenoid coil as the magnetizing means of the traveler clearer 2. The traveler clearer 2 is fixed by screws 9 with the lower surface of the clearer main body 2 a contacting the upper surface of the ring rail 7 without the packing 10. An exciting coil 15 is wound around each of the blades 2b of the traveler clearer 2. Both exciting coils 15 are connected to the judging device 6.

The judging device 6 comprises a detection circuit section 16 and a power source Vcc as shown in FIG. The detection circuit section 16 and the power source Vcc are provided corresponding to each exciting coil 15. Note that FIG. 7 illustrates only one exciting coil 15. The detection circuit section 16 includes a comparator 17 and resistors R1 to R5. The first end of the exciting coil 15 is connected to the inverting input terminal of the comparator 17 via the resistor R1, and the second end is connected to the non-inverting input terminal of the comparator 17 via the resistor R2. The second end of the exciting coil 15 and the resistor R2 are connected to the power supply Vcc via the resistor R3 and grounded via the resistor R4. The output side of the comparator 17 is connected to the second end of the pull-up resistor R5, the first end of which is connected to the power supply Vcc. Since the pull-up resistor R5 uses the open-collector comparator 17, it is connected to prevent floating. If the comparator 17 is not an open collector, pull-up resistor R
5 becomes unnecessary. For example, a voltage of 12V is used for the power supply Vcc, and the resistors R1 to R5 have the same resistance value (3 kΩ in this embodiment).

The first end of the exciting coil 15 is connected to the power supply Vcc via the resistor R6. The resistance value of the resistor R6 is approximately 100 times the resistance value of the resistor R3,
In this embodiment, the one of 330 kΩ is used.

In the yarn breakage detecting sensor of this embodiment, the traveler clearer 2 is driven by the current supplied to the exciting coil 15.
Of the two magnetic circuits 11 that are magnetized and pass through a part of the ring flange 8a of the adjacent ring 8 as in the above embodiment.
Is formed. When the traveler 13 is stopped,
The current flowing through the exciting coil 15 is constant, and the exciting coil 15
And the magnetic flux passing through the exciting coil 15 is kept constant. The voltage between the terminals of the exciting coil 15 is held at 0V, and the output of the comparator 17 is also 0V.
Held in.

In a normal state in which no thread breakage has occurred, the traveler 13 crosses the magnetic circuit 11 every time it makes one rotation on the ring flange 8a. When the traveler 13 crosses the magnetic circuit 11, the inductance of the exciting coil 15 changes, an induced electromotive force is generated in the exciting coil 15, and the terminal voltage of the exciting coil 15 changes. When the voltage on the inverting input terminal side becomes larger than the voltage on the non-inverting input terminal side, the voltage Vcc (12V) is output from the output terminal of the comparator 17. Therefore, as shown in FIG.
The inter-terminal voltage of 5 changes in synchronization with the rotation of the traveler 13, and the comparator 17 outputs a pulse signal in synchronization with the rotation of the traveler 13.

The judging device 6 judges the presence or absence of yarn breakage based on the output of the comparator 17. Since the spindle continues to rotate even in the yarn breakage state, the traveler may rotate together. This is because the gap between the yarn and the traveler is about 1 mm when it is close to a full pipe, so that the fluff on the surface of the yarn hits the traveler and the traveler rotates, or the traveler rotates due to the accompanying air flow due to the rotation of the yarn. However, the speed at which the traveler 13 rotates due to the accompanying rotation is much slower than the rotation speed during normal operation of the ring spinning frame, even if the speed is high. Therefore, the period T1 of the output pulse
Can be determined or the number of output pulses per unit time can be counted to determine the presence or absence of yarn breakage.

The present invention is not limited to the above-mentioned embodiments. For example, the directions of the north pole and the south pole of the permanent magnet 4 may be reversed, or the traveler clearer 2 may be replaced by a structure in which two weights are shared. It may be configured to have one blade portion 2b. Further, the shape and fixing position of the traveler clearer 2 may be arbitrarily changed.

The solenoid coil 14 is used as a magnetizing means.
In the second embodiment using, instead of winding the solenoid coil 14 around the clearer main body 2a, each blade portion 2
You may wind each on b. In this case, the pickup coil 5 and the solenoid coil 14 may be wound in different positions, or the pickup coil 5 may be wound outside the solenoid coil 14.

In the third embodiment, the winding directions of the exciting coils 15 wound around the pair of blade portions 2b are such that the directions of the magnetic flux generated by the exciting coils 15 do not interfere with each other when passing through the clearer main body 2a. However, it may be wound in a direction in which interference occurs. Further, instead of fixing the entire lower surface of the clearer main body 2a in contact with the upper surface of the ring rail 7, the clearer main body 2a may be fixed with a screw 9 via a washer made of a magnetic material, or a convex portion may be formed on the lower surface of the clearer main body 2a. Alternatively, the convex portion may be fixed so as to be in contact with the upper surface of the ring rail 7.

Further, in the third embodiment, the comparator 17
Without the provision of the above, it is possible to directly detect whether or not the terminal voltage of the exciting coil 15 fluctuates to judge the yarn breakage, or to obtain the rotation speed of the traveler 13 from the fluctuation cycle of the terminal voltage or the generation cycle of the output pulse. Abnormalities in the number of revolutions may be detected by comparison with a predetermined number of revolutions. The same applies to the first and second embodiments.

[0038]

As described in detail above, according to the present invention, it is not necessary to secure a new space for mounting a yarn breakage detection sensor for detecting the presence or absence of yarn breakage for each weight in real time, and the yarn breakage is not required. The detection sensor can be easily attached later.
Further, the air gap of the magnetic circuit can be automatically adjusted to an appropriate state by adjusting the clearance of the traveler clearer, and the air gap is always in the appropriate state even if the size of the traveler is changed.

Further, when a permanent magnet is used as the magnetizing means, a power source for the yarn breakage detecting sensor is not required, which simplifies the structure and reduces the cost. Further, when the traveler clearer is configured to be used for two spindles, one traveler clearer can detect yarn breakage of two spindles, and the manufacturing cost of the yarn breakage detection sensor per spindle is further reduced.

Further, when the pickup coil is configured to supply a predetermined current, it is not necessary to separately provide a permanent magnet or an exciting solenoid as the magnetizing means of the traveler clearer, and the structure of the sensor is simplified and the cost is reduced. To do.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a state in which a yarn breakage detection sensor according to a first embodiment of the present invention is attached to a ring rail.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a schematic cross-sectional view for explaining the operation.

FIG. 5 is a graph showing changes in the output voltage from the pickup coil.

FIG. 6 is a schematic plan view showing a state in which the thread breakage detection sensor of the second embodiment is attached to a ring rail.

FIG. 7 is a circuit diagram of a yarn breakage detection sensor according to a third embodiment.

FIG. 8 is a diagram showing changes in the inductance of the exciting coil, the magnetic flux, the voltage between terminals, and the output voltage of the comparator during normal spinning.

[Explanation of symbols]

1 ... Thread breakage detection sensor, 2 ... Traveller clearer, 2a ...
Clearer main body, 2b ... Blade portion, 4 ... Permanent magnet as magnetizing means, 5 ... Pickup coil, 7 ... Ring rail, 8 ... Ring, 8a ... Ring flange, 11 ... Magnetic circuit, 13 ... Traveler, 14 ... Magnetizing means Comprising solenoid coil, 15 ... Exciting coil as a pickup coil that also serves as magnetizing means, 16 ... Detection circuit section, Vcc ... Power supply.

Claims (4)

[Claims] 1. A yarn breakage detection sensor for a spinning machine, which detects the presence or absence of a yarn by utilizing an electromagnetic induction effect of a traveler made of a magnetic material that rotates on a ring made of a magnetic material, crossing a magnetic circuit. A thread breakage detection sensor for a spinning machine in which a traveler clearer attached to a fixed position is used as a magnetic core, a magnetizing means for magnetizing the magnetic core is provided in the traveler clearer, and a pickup coil is wound around the magnetic core. 2. The yarn breakage detection sensor for a spinning machine according to claim 1, wherein the magnetizing means is a permanent magnet fixed to the clearer main body. 3. The traveler clearer comprises a clearer main body having two common weights and a blade portion branched left and right from the clearer main body, and an independent pickup coil is wound around each blade portion. Breakage detection sensor for spinning machines. 4. The yarn breakage detection sensor for a spinning machine according to claim 1, wherein a power supply for supplying a predetermined current is connected to the pickup coil, and the pickup coil also serves as a magnetizing means.