JPH073551A - Yarn breakage detection sensor for spinning frame - Google Patents

Abstract

PURPOSE:To obviate the security of a new space for the attachment of a yarn breakage detection sensor to detect the occurrence of yarn breakage for each spindle in real time and to automatically adjust the air gap of a magnetic circuit to the optimum state in the case of adjusting the clearance of a traveler clearer. CONSTITUTION:This yarn breakage detection sensor 1 is integrated with a traveler clearer 2. The traveler clearer 2 made of a magnetic material is provided with a clearer main body 2a and a pair of blade parts 2b branched from the tip end of the main body toward right and left. A permanent magnet 4 is fixed to each blade part 2b of the clearer. Each blade part 2b has an independent pick-up coil 5 wound around the blade.

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.

Moreover, as shown in FIG.
In Japanese Patent No. 322, a storage space 8a is formed in a separator 15 that divides the weights fixed on the ring rail 7 and a storage space 8a is formed in the space. The storage space 8a includes a permanent magnet 40, a magnetic core 41, and a coil 42. The yarn breakage detector 50, which utilizes the electromagnetic induction effect of the traveling of the upper traveler 13, is housed, and the iron plate 43 is arranged on the other side surface.
Discloses a device for detecting the presence or absence of yarn breakage only in the weight located on one side of the separator 15.

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, Japanese Patent Publication No. 60-23322 shown in FIG.
The device disclosed in the publication has a problem that a special separator having a storage space for incorporating a detector is required. Also, because the detector is built into the separator,
The distance between the magnetic core and the trajectory of the traveler increases,
An amplifier is required to amplify the detection signal.

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 for spinning machines, the traveler clearer mounted on the ring rail is used as a magnetic core, the blade part of the traveler clearer is provided with magnetizing means for magnetizing the magnetic core, and the magnetic core is provided with a pickup coil. It wound.

It is preferable that the traveler clearer is mounted so that a fixed position can be adjusted, and the magnetizing means is a bobbin of a permanent magnet fitted to the blade portion, and a pickup coil is wound on the bobbin. 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.

[0011]

[Function] The traveler clearer is magnetized 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. Since it is provided on the blade portion of the traveler clearer, separation and separation of the pickup coil and the magnetizing means can be prevented, and an effective magnetic circuit with a minimum magnetic flux loss can be formed. Therefore, although the magnetic permeability of the cutting blade at the tip of the blade portion of the clearer is reduced by the heat hardening treatment, a sufficient pickup coil output can be obtained by minimizing the magnetic flux loss to the pickup coil. 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. Then, if the permanent magnet is in the form of a bobbin and the pickup coil is wound on the bobbin, the magnetizing means and the pickup coil can be factory-manufactured as a unit. It can be done simply by fitting and fixing, and rationalization of work can be achieved. 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.

[0013]

【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 toward each other, and a cutting edge 2c having a serrated edge is formed at the tip thereof. 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 pair of permanent magnets 4 serving as a magnetizing means for magnetizing the magnetic core are sandwiched between the standing parts of the blade parts 2b on both sides of the clearer body 2. It is stuck in. Each permanent magnet 4 has N
The pole is fixed so that it is on the side of the blade portion 2b,
In short, the permanent magnets 4 mounted with the blade portion 2b sandwiched therebetween need to have the same poles on the opposite sides. An independent pickup coil 5 is wound around each blade portion 2b. Each pickup coil 5 is a cylindrical unit whose winding portion is resin-molded, and both ends thereof 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 (not shown) is formed at a predetermined position on the front side (lower side in FIG. 1A) of the ring rail 7. The traveler clearer 2 is extended between the adjacent rings 8 provided on the ring rail 7 in a direction orthogonal to the longitudinal direction of the ring rail 7, and through the long hole 3 near the base end of the clearer body, the screw 9 is screwed. It is fixed on the ring rail 7 by.

Next, the operation of the device configured as described above will be described. As shown in FIG. 3, the traveler clearer 2, the ring rail 7 and the ring 8 have the N pole of the permanent magnet 4 due to the action of the two permanent magnets 4 fixed by sandwiching the standing portion of the blade portion 2b of the clearer body. The magnetic circuit 11 formed by the magnetic flux from the S pole to the S pole is formed. Each permanent magnet 4 is a pickup coil 5 wound on the blade portion 2b.
Almost all of the magnetic flux exits through 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. 3, 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 a 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 breakage occurs. 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 (0 V) 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. In addition, the rotation speed of the traveler 13 can be calculated by counting the number of pulses output from the pickup coil 5 by the determination device 6 per unit time.

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

Since the traveler clearer 2 reliably removes the fibers attached to the traveler 13 from the traveler 13 before the fibers grow much, the clearance between the cutting edge 2c and the traveler 13 is strictly controlled, and the size of the traveler 13 is adjusted. The fixed position is adjusted correspondingly. The traveler clearer 2 is fixed so as to be positioned as close to the rotation locus of the traveler 13 as possible with the cutting edge 2c not interfering with the traveler 13. Therefore, the distance between the cutting edge 2c 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. .

Further, 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. Further, since the pickup coil is fitted to the blade portion 2b as a unit molded with a synthetic resin, there is no invasion of cotton wool into the coil, and therefore the assembling and maintenance are easy.

(Embodiment 2) FIG. 4 shows a modification of the magnetizing means. As shown in (A), the pickup coil bobbin 4a
Is made of a magnetic material and is magnetized so that magnetic flux passes in the longitudinal direction of the coil. Then, the pickup coil 5 is attached to the bobbin 4a.
Is manufactured in advance, and at the time of assembly, the unit is attached to the tip of the blade portion 2b of the traveler clearer,
That is, it is fitted from the cutting edge 2c side.

In this embodiment, since the pickup coil 5 is wound around the permanent magnet bobbin, there is an advantage that it can be manufactured as a unit product and the unit can be resin-molded for easy handling. The traveler clearer 2 has two magnetic circuits 1 passing through a part of the ring flanges 8a of the adjacent rings 8 as in the above embodiment.
1 is formed.

Therefore, a unit in which the magnetic flux loss is minimized can be easily manufactured at low cost. Then, 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 whether or not the pulse voltage is output from the pickup coil 5,
The judgment device 6 judges whether or not the yarn is broken.

The present invention is not limited to the above-mentioned embodiments, but one permanent magnet can be attached to each blade portion 2b, an electromagnet can be used as a magnetizing means, and the permanent magnet 4 can be used. The north pole and the south pole may be reversed in direction, or the traveler clearer 2 may be configured to have one blade portion 2b instead of sharing two weights. Further, a solenoid coil may be wound around each blade portion 2b as a magnetizing means. In this case, the pickup coil 5 and the solenoid coil may be wound at different positions, or the pickup coil 5 may be wound outside the solenoid coil. Also, the shape of the traveler clearer 2 and the traveler 1
The fixed position of 3 may be changed arbitrarily.

[0027]

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 attached easily.
Further, since the magnetizing means is provided in the blade portion of the traveler clearer, the loss of the magnetic flux passing through the pickup coil can be minimized, and the magnetic permeability of the blade portion can be sufficiently reduced even though the cutting edge 2c is hardened. A pickup coil output is obtained. 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 unnecessary, the structure is simple and the cost is low. When the magnetizing means is a magnet bobbin and the pickup coil is wound on the bobbin, it can be reasonably manufactured as a unit product,
Handling and maintenance are easy, and the traveler clearer integrated sensor can be downsized. 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.

[Brief description of drawings]

1A is a schematic plan view showing a state in which a thread breakage detection sensor of a first embodiment of the present invention is attached to a ring rail, and FIG. 1B is an enlarged view of a blade portion of FIG. 1A. is there.

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

FIG. 3 is an explanatory view of a magnetic flux formation state by a magnetizing means.

FIG. 4 shows a second embodiment, in which (A) is a magnet bobbin and (B) is a drawing in which a pickup coil is wound around the bobbin.

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

FIG. 6 is a partial cross-sectional plan view of a conventional example.

[Explanation of symbols]

 1 ... Thread breakage detection sensor 2 ... Traveler clearer 2a ... Clearer main body 2b ... Blade part 2c ... Cutting edge 4 ... Permanent magnet as magnetizing means 4a ... Magnet bobbin 5 ... Pickup coil 7 ... Ring rail 8 ... Ring 8a ... Ring flange 11 ... Magnetic circuit 13 ... Traveler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruka Nakamura, Inventor Haruka Nakamura, 2-chome, Toyota-cho, Kariya City, Aichi Stock Company Toyota Industries Corp.

Claims (3)

[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 magnetic core is used as a magnetic core, a magnetizing means for magnetizing the magnetic core is provided in a blade portion (2b) of the traveler clearer, and a pickup coil (5) is wound around the magnetic core. . 2. The yarn for a spinning machine according to claim 1, wherein the traveler clearer (2) is attached so that a fixed position can be adjusted, and the magnetizing means is a magnet bobbin fitted to the blade portion (2b). Breakage detection sensor. 3. The traveler clearer comprises a clearer main body having two common weights and a blade portion (2b) branched left and right from the clearer main body, and an independent pickup coil (5) is wound around each blade portion. The yarn breakage detection sensor of the spinning machine according to claim 1.