JP3304762B2 - Rotor drive device of rotor type open-end spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an outer rotor having a fiber bunching portion, wherein an inner rotor for guiding a yarn drawn from the fiber bunching portion to an end of a yarn drawing path is provided coaxially with the outer rotor. The present invention relates to a rotor drive device for a rotor-type open-end spinning machine that can be actively driven independently of an outer rotor.

[0002]

2. Description of the Related Art Generally, in a rotor-type open-end spinning machine, a supply sliver is opened by a combing roller to separate impurities, and the separated fibers are separated based on a negative pressure in a rotor rotating at a high speed. It is transported into the rotor by the airflow generated in the transport passage (fiber transport channel). Then, the fibers transported into the rotor are collected into a fiber collecting portion, which is the maximum inner diameter portion of the rotor, and are drawn out from a guide hole (thread drawing passage) provided at the center of the navel by the action of a yarn drawing roller. Is twisted by the rotation of the to form a yarn, which is wound on a bobbin as a package.

[0003] Open-end spinning machines have better productivity than ring spinning machines. However, the fiber bundle focused on the fiber bundle is only attached to the inner wall surface of the fiber bundle by the action of centrifugal force accompanying the rotation of the rotor. Therefore, the twist applied to the fiber bundle drawn out along the guide hole is transmitted to a certain extent to the fiber bundle upstream of the stripping point of the fiber bundle collected in the fiber collecting portion. As a result, the twist is added in a state where the fiber is not sufficiently stretched without obtaining sufficient tension at the time of twisting, so that the fiber is not twisted straight,
There was a problem that the yarn strength did not increase.

As a device for solving the drawbacks of the conventional open-end yarn, a yarn path for drawing out a fiber bundle bundled in the fiber bundle is provided inside an outer rotor having a fiber bundle, and is actively independent of the outer rotor. A device provided with a driven inner rotor (hereinafter, referred to as a double-rotor open-end spinning machine) has been proposed (for example, Japanese Patent Application Laid-Open No. 5-44119). To obtain high quality spun yarn with a double rotor open-end spinning machine,
It is necessary that the rotation speed (rotation speed) of the outer rotor and the inner rotor be operated in a predetermined relationship. Japanese Patent Laid-Open No. 5-
Japanese Patent No. 44119 discloses that when the diameter of the fiber bundle is D, the rotation speed of the outer rotor is R1, and the rotation speed of the inner rotor is R2, it is desirable that the spinning speed V satisfies the following expression.

ΠDR1 + 0.8V ≦ πDR2 ≦ πDR1 + V (1) As a driving device for both rotors, a device in which the shaft of the outer rotor is driven by a belt common to a plurality of weights, and the shaft of the inner rotor is driven by a separate motor has been proposed. ing. That is, as shown in FIG. 8, the outer rotor 61 is supported by a first end of a cylindrical rotor shaft 62. The shaft 63 is supported by the bearing 64 so as to be rotatable relative to the rotor shaft 62 and immovable in the axial direction while passing through the rotor shaft 62.
An inner rotor 65 is supported at a first end of the first rotor so as to be integrally rotatable. The rotor shaft 62 is pressed against the outer peripheral surfaces of the two sets of support disks 66, and is supported in a state where it receives a thrust force toward the second end from the support disks 66 during rotation.
The rotor shaft 62 can be driven by a drive belt 67 that is common to a plurality of weights and travels in a direction perpendicular to the axial direction.

The second end of the shaft 63 has a thrust bearing 6.
8 and a motor 70 is mounted in the middle of the shaft 63. That is, the shaft 6
3, a rotor 71 is fixed so as to be integrally rotatable, and a casing 73 containing a coil 72 is arranged around the rotor 71 to constitute a motor 70. The coil 72 has an inverter 7
A voltage of a predetermined frequency corresponding to a target rotation speed is supplied via 4 and the shaft 63 is driven. The control device 75 calculates the rotation speed of the outer rotor 61 based on the output signal of the rotation detection sensor 76, and calculates the rotation speed of the inner rotor 65 corresponding to the rotation speed. Then, a voltage having a frequency corresponding to the value is instructed to the inverter 74 to drive the motor 70.

[0007]

When the above equation (1) is rewritten, the following equation is obtained. R1 + 0.8V / (πD) ≦ R2 ≦ R1 + V / (πD) (2) For example, the rotation speed R1 of the outer rotor = 60000 rp
When m, yarn count Ne = 20, twist coefficient k = 4.0, and diameter D of the fiber bundle, D = 36 mm, the spinning speed V is as follows.

V = 60000 × 0.0254 / {k}
(Ne)｝ ≒ 85 m / min As a result, the rotation speed R2 of the inner rotor is as follows. 60000 + 601 ≦ R2 ≦ 60000 + 751 Therefore, the variation of the value of the rotation speed of the inner rotor with respect to the rotation speed of the outer rotor is only allowed at 150 rpm. This allowable range is only 0.2 rotations of the outer rotor.
When the winding speed is low in the spinning operation with a large number of twists or in the spinning operation of fine yarn, the allowable range is further narrowed. If the outer rotor and the inner rotor are not accurately driven synchronously during the piecing operation, the piecing success rate decreases.

As a result, in the double-rotor open-end spinning machine, it is necessary to accurately and synchronously drive the outer rotor and the inner rotor. However, a drive belt 67 that brings the outer rotor 61 into frictional contact with the peripheral surface of the rotor shaft 62
In the configuration of driving the outer rotor 61, the rotation speed of the outer rotor 61 is different for each weight due to slip generated between the drive belt 67 and the rotor shaft 62, variation in the contact pressure of the drive belt 67 with the rotor shaft 62, or difference in load. Fluctuates. Therefore, it is necessary to detect the rotation speed of the outer rotor for each weight and perform high-precision synchronization control based on the value.

However, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 5-44119, the rotation speed (rotation speed) of the support disk 66 that rotatably supports the rotor shaft 62 is detected, and the rotation speed of the outer rotor 61 is determined. Since the calculation is performed, it is difficult to perform accurate synchronization control. This is because a slip may occur between the support disk 66 and the rotor shaft 62, and the rotation of the rotor shaft 62 is not always transmitted to the support disk 66 accurately. Therefore, setting the rotation speed of the inner rotor based on the rotation speed of the support disk 66 poses a problem when performing highly accurate control.

In a general rotor-type open-end spinning machine without an inner rotor, as a device for detecting the number of revolutions of the rotor, marking is performed at predetermined intervals on the outer peripheral surface of the rotor, and a photoelectric pulse detector is arranged near the rotor. (Japanese Patent Laid-Open Publication No. Sho 51-105432). It is conceivable that this method is applied to the detection of the rotation speed of the outer rotor of a double-rotor open-end spinning machine.

When the method disclosed in JP-A-51-105432 is applied, a marking is provided on the outer peripheral surface of the outer rotor, and a reflective optical sensor is provided near the outer rotor. The sensor is mounted on a housing that abuts the open end of the casing that houses the outer rotor and closes the opening. Then, it outputs a pulse signal proportional to the rotation speed of the outer rotor based on the reflected light from the outer rotor. However, since a part of the spread fiber supplied to the outer rotor is floating in the accommodation space of the sensor, the spread fiber accumulates on the sensor when left for a long time, and the output light from the sensor and the reflection from the outer rotor are reflected. Light may be blocked. Therefore, there is a problem that it is necessary to perform cleaning periodically, which is troublesome and spinning is interrupted during that time, thereby lowering productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a rotor drive device for a rotor type open-end spinning machine capable of synchronously driving an outer rotor and an inner rotor with high accuracy for each spindle. Is to provide.

[0014]

In order to achieve the above object, according to the first aspect of the present invention, the yarn drawn from the fiber bundle is threaded into an outer rotor having a fiber bundle where fibers are bundled. An inner rotor for guiding to the end of the drawing passage is provided coaxially with the outer rotor,
In a rotor-type open-end spinning machine in which the inner rotor can be actively driven independently of the outer rotor,
A servo motor that rotationally drives the inner rotor for each weight, a magnetic sensor that detects a magnetized detection portion provided on the outer rotor or a rotating shaft that rotates integrally with the outer rotor, and detects the rotation speed of the outer rotor, A rotational speed detecting means for detecting a rotational speed of the yarn pull-out roller, and calculating a proper rotational speed of the inner rotor corresponding to the rotational speeds of the outer rotor and the yarn pull-out roller based on detection signals from the magnetic sensor and the rotational speed detecting means. And a control means for controlling the servomotor so that the inner rotor rotates at the calculated rotation speed.

According to the second aspect of the present invention, the end of the rotation shaft of the inner rotor is assembled to the rotor of the servomotor so as to be integrally rotatable. According to a third aspect of the present invention, in the first or second aspect of the invention, the magnetic sensor and the rotational speed detecting means output pulse signals corresponding to the rotational speeds of the outer rotor and the yarn pull-out roller, respectively. The calculation means calculates the rotation speed of the outer rotor and the yarn pull-out roller based on the count value of the number of pulses output from the reference oscillator while the predetermined number of pulse signals are output from the magnetic sensor and the rotation speed detection means.

According to a fourth aspect of the present invention, in the third aspect of the invention, the calculating means divides an output pulse signal of the magnetic sensor and the rotation speed detecting means and outputs one of the divided pulse signals. The rotation speeds of the outer rotor and the yarn pull-out roller are calculated based on count values of counters for counting the number of pulses output from the reference oscillator between pulses.

According to a fifth aspect of the present invention, in the third or fourth aspect of the invention, the arithmetic means is constituted by a microprocessor, and the reference oscillator is a reference clock oscillator of the microprocessor.

According to the first to fourth aspects of the present invention, the fibers supplied in an opened state are bundled in the fiber bundle of the outer rotor. The fiber bundle bundled in the fiber bundle is stripped from the fiber bundle and guided to the end of the yarn drawing path via the inner rotor while being twisted. The inner rotor is rotated coaxially with the outer rotor by a servo motor for each weight. The rotation speed of the outer rotor is detected by a magnetic sensor provided on the outer rotor or a rotating shaft that rotates integrally with the outer rotor and detects a magnetized detection target. The magnetic sensor is the rotation speed (rotation speed) of the outer rotor
Output a pulse signal corresponding to. The rotation speed of the yarn pull-out roller is detected by a rotation speed detecting means. The calculation means calculates an appropriate rotation speed of the inner rotor corresponding to the rotation speed of the outer rotor and the yarn pull-out roller based on the detection signals of the magnetic sensor and the rotation speed detection means. The control means controls the servomotor so that the inner rotor rotates at an appropriate rotation speed calculated by the calculation means.

According to the second aspect of the present invention, the end of the rotating shaft of the inner rotor is assembled to the rotor of the servomotor so as to be integrally rotatable, so that the apparatus is compact.
According to a third aspect of the present invention, in the first or second aspect of the invention, the magnetic sensor and the rotational speed detecting means output pulse signals corresponding to the rotational speeds of the outer rotor and the yarn pull-out roller, respectively. A pulse signal output from the magnetic sensor, the rotational speed detecting means, and the reference oscillator is input to the calculating means. While the predetermined number of pulse signals are output from the magnetic sensor and the rotation speed detection means, the rotation speed of the outer rotor and the yarn pull-out roller is calculated by the calculation means based on the number of pulses output from the reference oscillator.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the output pulse signals of the magnetic sensor and the rotational speed detecting means are divided and then input to the respective counters. Based on the number of output pulses of the reference oscillator counted by the counter during one pulse of the output pulse signal of the magnetic sensor and the rotation speed detecting means after the frequency division, the rotation speed of the outer rotor and the yarn pull-out roller is set to the aforementioned value. It is calculated by the calculating means.

According to a fifth aspect of the present invention, in the third or fourth aspect of the invention, the arithmetic means is constituted by a microprocessor, and a reference clock oscillator of the microprocessor is used as the reference oscillator.
Therefore, when the arithmetic means is a microprocessor, it is not necessary to newly provide a reference oscillator for the counter.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2
As shown in FIG. 1A, a supporting disk 3 is supported at both ends of a pair of rotating shafts 2 disposed in parallel with each other via a bearing 1 so as to be integrally rotatable. As shown in FIG. 2A, a pair of adjacent support disks 3 form a wedge-shaped recess 4. A cylindrical rotor shaft 5 as a rotating shaft is supported in the wedge-shaped recess 4 with its outer peripheral surface in contact with the peripheral surface of each support disk 3, and an outer rotor 6 is integrated with a first end of the rotor shaft 5. It is rotatably supported.
The two pairs of support disks 3 apply a thrust load toward the second end to the rotor shaft 5 during rotation.
It is fixed in a state of being slightly inclined with respect to the rotating shaft 2.

A drive belt 7 common to a plurality of weights is disposed between the two pairs of support disks 3 so as to run in a direction perpendicular to the rotor shaft 5 with the rotor shaft 5 pressed against the support disk 3. I have. The drive belt 7 is driven by a drive motor (not shown), and the rotor shaft 5 is rotationally driven by the travel of the drive belt 7. The drive belt 7 is urged toward the rotor shaft 5 by pressing rollers (not shown) arranged at predetermined intervals along the drive belt 7.

Bearings 8 are fitted and fixed to both inner ends of the rotor shaft 5, and a shaft 9 penetrating the rotor shaft 5 is rotatable relative to the rotor shaft 5 via the bearings 8 and relatively moved in the axial direction. Supported by the impossible. The first end of the shaft 9 has an inner rotor 1
0 is fixed in the outer rotor 6 so as to be integrally rotatable.

A brushless D is provided on the second end side of the shaft 9.
C servomotor (hereinafter simply referred to as servomotor) 11
Are arranged. A second end of the shaft 9 is provided with a rotor (rotor) 12 made of a permanent magnet that constitutes the servomotor 11.
The shaft 9 is configured so as to be integrally rotatable with the rotor 12 and is detachable from a motor housing 13 that forms a stator (stator) together with the rotor 12. The outer diameter of the rotor 12 is formed to be the same as the outer diameter of the rotor shaft 5. A coil 14 is disposed at a predetermined position on the motor housing 13, and a second end of the shaft 9 protrudes from the motor housing 13 in a state where the rotor 12 is disposed at a predetermined position facing the coil 14. 15 is supported. Further, a hall element (not shown) is incorporated in the servo motor 11 as a position sensor that shapes the angular position of the rotor 12.

The thrust bearing 15 includes a case 16 containing lubricating oil, a ball 18 supported by an oil supply member 17 made of felt, and an adjusting screw 19 abutting the ball 18 from the opposite side of the shaft 9. I have. When the support disk 3 rotates, a thrust load acting on the rotor shaft 5 is transmitted to the shaft 9 via the bearing 8 and is carried by the thrust bearing 15.

As shown in FIGS. 2A and 2B, the inner rotor 10 is formed in a disk shape, and has a
The concave portion 21 having a diameter larger than the maximum outer diameter is formed.
The inner rotor 10 has a yarn path 22 extending from a position corresponding to the fiber bundle 6a formed on the outer rotor 6 to the recess 21.
Are formed in a state where the same side as the opening of the outer rotor 6 is opened. A guide member 23 is disposed at the entrance of the yarn path 22 in the front of the rotation direction of the inner rotor 10 (clockwise direction in FIG. 2A). The guide member 23 has a shaft portion 23a having a diameter larger than the diameter of the yarn Y,
A tapered surface 23b formed at the tip and having a diameter increasing toward the tip is provided, and the tip surface is disposed so as to protrude from the end surface of the inner rotor 10.

A boss 25 is formed in the housing 24 disposed at a position facing the open side of the outer rotor 6 so as to protrude into the outer rotor 6. Boss part 25
One end of a fiber transport passage 26 that guides the fiber opened by a combing roller (not shown) into the outer rotor 6 is opened on the peripheral surface of the fiber. The navel 20 is fixed to the center of the boss 25, and one end of a yarn drawing path 27 for guiding the spun yarn Y to the winding device is opened at the center of the navel 20. A yarn pipe 28 that constitutes a part of the yarn drawing path 27 is disposed so as to intersect with the center line of the navel 20.

A casing 29 covering the outer rotor 6 is provided at a position facing the housing 24.
Are disposed in a state of contact with the end surface of the O.D. The casing 29 is connected to a negative pressure source (not shown) via a pipe 31. The housing 24 is rotated about a support shaft (not shown), and the surface facing the casing 29 is rotated clockwise in FIG. 1 so that the casing 29 is opened so that the outer rotor 6 can be moved in the axial direction. Has become.

At the second end of the rotor shaft 5, a detected part 32 is provided. As shown in FIG. 3, the detected part 32 is formed of a cylindrical magnetic body having a large diameter part 32a and a small diameter part 32b, and the large diameter part 32a has one S pole and one N pole along its circumferential direction. It is magnetized so that it exists every time. The outer diameter of the small diameter portion 32b is formed to be the same as the inner diameter of the rotor shaft 5. The detected portion 32 is fitted to the rotor shaft 5 so as to be integrally rotatable while being loosely inserted into the shaft 9. Accordingly, the magnetic sensor 30 is set to 1 every time the rotor shaft 5, that is, the outer rotor 6 rotates once.
A pulse output signal is output.

As shown in FIG. 1, a magnetic sensor 33 is provided at a predetermined position corresponding to the detected part 32. The magnetic sensor 33 is electrically connected to a control device 34 as control means.
Is output to the control device 34 in proportion to the number of rotations. As the magnetic sensor 33, for example, a Hall element is used. At the end of a take-up roller 35 common to all weights as a yarn pull-out roller for pulling out the yarn Y from the yarn pipe 28, a rotary encoder 36 as rotation speed detecting means is provided. The rotary encoder 36 outputs a pulse signal proportional to the rotation speed of the take-up roller 35. In this embodiment, a rotary encoder that outputs 100 pulses per rotation of the take-up roller 35 is used. The servo motor 11 is connected to a control device 34 via a servo amplifier 37.
It is connected to the. In FIG. 1, for convenience, the rotor shaft 5 and the take-up roller 35 are drawn so as to extend in parallel. However, in reality, the rotor shaft 5 is arranged so as to extend in a direction orthogonal to the take-up roller 35.

As shown in FIG. 4, the control device 34 includes a microprocessor (C in this embodiment)
PU) 38, a program memory 39 as storage means,
Working memory 40, first and second counters 41, 4
2, frequency divider circuits 43 and 44, reference clock oscillator 45, input interface 46, output interface 47, D /
An A converter 48 and an input device 49 are provided. CP
U38 also functions as control means. The CPU 38 is connected to the servo amplifier 37 via an output interface 47 and a D / A converter 48. Also, the CPU 38
Drives and controls a motor for driving the outer rotor and a motor for driving the winding drive system (both not shown) via a motor drive circuit (not shown).

The CPU 38 operates based on predetermined program data stored in the program memory 39. The program memory 39 is a read-only memory (ROM). The program memory 39 stores the program data and various data necessary for executing the program data.
As various data, there are correspondence data between spinning conditions such as various fiber types and spun yarn count and steady spinning speed. The program memory 39 stores the rotation speed R of the outer rotor 6.
1 shows the relationship between the rotation speed R3 of the rotational speed R2 and the take-up roller 35 of In'naro motor 10 (3) are stored.

R2 = R1 + k (Dt / D) R3 (3) where D is the diameter of the fiber bundle 6a, Dt is the diameter of the take-up roller 35, and k is a coefficient of 0.8 to 1. (3)
The equation is derived from equation (1).

ΠDR1 + 0.8V ≦ πDR2 ≦ πDR1 + V (1) That is, since the spinning speed V is V = πDt R3, (1)
The formula is as follows. R1 + 0.8 (Dt R3) / D ≦ R2 ≦ R1 + (Dt R3)
/ D Therefore, from this equation, the rotation speed R2 of the inner rotor 10 is expressed by equation (3).

The working memory 40 is a readable and rewritable memory (RAM), and temporarily stores data input by the input device 49, results of arithmetic processing by the CPU 38, and the like. The working memory 40 has a backup power supply. The input device 49 inputs spinning condition data such as fiber type, spun yarn count, outer rotor speed during spinning operation, spinning speed, and the like.

The magnetic sensor 33 has an input interface 46
Is connected to the frequency dividing circuit 43 via the. The first counter 41 outputs a pulse signal output from the magnetic sensor 33 and frequency-divided by the frequency dividing circuit 43 to a reference clock oscillator 45.
And the output pulse signal. And the frequency dividing circuit 43
The number of output pulses of the reference clock oscillator 45, which is input from one rising to the next rising of the pulse signal output from the counter, that is, during one pulse is counted.

The rotary encoder 36 is connected to a frequency dividing circuit 44 via an input interface 46. Second
The counter 42 receives the pulse signal output from the rotary encoder 36 and frequency-divided by the frequency dividing circuit 44, and the output pulse signal of the reference clock oscillator 45. Then, the number of output pulses of the reference clock oscillator 45 input from one rising of the pulse signal output from the frequency dividing circuit 44 to the next rising, that is, one pulse is counted.

The counters 41 and 42 have a width of 32 bits and employ a double buffer system. That is, the frequency dividing circuit 4 includes two counting buffers.
The number of output pulses of the reference clock oscillator 45 from the rise of the output pulse signal from the reference signal 44 to the next rise can be continuously counted by alternately switching the buffer.

The D / A converter 48 has a resolution of 20
The output voltage is adjusted so as to give a speed instruction of 100,000 rpm in full bits. The CPU 38 controls the driving of the motor for driving the outer rotor and the motor for driving the winding drive system so that the motor rotates at a predetermined rotational speed corresponding to the spinning conditions input by the input device 49. Further, the CPU 38 determines the above (3) based on the count values of both counters 41 and 42.
The rotation speed R2 of the inner rotor 10 that satisfies the relationship of the formula is calculated in real time, and the control signal is sent to the servo amplifier 37 via the D / A converter 48 so that the rotation speed of the inner rotor 10 becomes the calculated predetermined rotation speed R2. Is output. The servo amplifier 37 drives and controls the servo motor 11 based on a command signal from the CPU 38 and a feedback signal from a Hall element of the servo motor 11.

Next, the operation of the above-configured apparatus will be described. The outer rotor 6 of each weight is driven via a drive belt 7 common to all weights, and the winding drive system including the take-up roller 35 is also driven by one motor. The inner rotor 10 is driven by each servomotor 11 so as to have a predetermined speed calculated for each weight based on the rotation speed of the outer rotor 6 and the rotation speed of the take-up roller 35. The inner rotor 10 is rotationally driven at a predetermined rotational speed in the same direction as the outer rotor 6. The inner rotor 10 is rotated at a speed at which the fiber bundle is stripped from the fiber bundle 6a (slightly faster than the rotation speed of the outer rotor 6). In this state, the spread fiber that has been spread by the action of the combing roller is fed into the outer rotor 6 from the fiber transport passage 26,
It adheres to the inner wall surface of the outer rotor 6 and slides along the inner wall surface to be focused on the fiber bundle 6a which is the maximum inner diameter portion. The fiber bundle bundled in the fiber bundle unit 6a is connected to the yarn Y drawn out through the yarn pipe 28 by the take-up roller 35, and is stripped from the fiber bundle unit 6a as the yarn Y is drawn out and twisted. It is pulled out as a thread Y. The twist added to the yarn Y and the fiber bundle is the yarn pipe 28
From the end of the fiber bundle to the fiber bundle 6a.

In this state, the fiber bundle stripped from the fiber collecting portion 6a is guided to the yarn drawing-out passage 27 via the yarn path 22 while being in contact with the shaft portion 23a of the guide member 23.
Therefore, the angle between the drawing direction of the fiber bundle near the stripping point (twisting point) and the fiber bundle bundled in the fiber bundle 6a, that is, the twisting angle is an obtuse angle. Then, the fiber bundle that is twisted while being stripped from the fiber bundle 6a has a smaller path difference between the inner side and the outer side, and the fiber bundle is twisted with substantially uniform force as a whole in a state where the fiber is straightened. . As a result, the drawn-out yarn Y is less likely to have irregularities on the outer peripheral portion, and the texture when made into a cloth is improved.

The CPU 38 calculates the rotation speed R1 of the outer rotor 6 for each weight and the rotation speed R3 of the take-up roller 35 corresponding to the spinning speed V, and calculates the rotation speed R2 of the inner rotor 11 satisfying the expression (3). Is calculated for each weight.

R2 = R1 + k (Dt / D) R3 (3) The diameter Dt of the take-up roller 35 is determined by the machine base, and the coefficient k is set in advance by spinning conditions. C
The PU 38 compares the rotation speed R1 of the outer rotor 6 and the rotation speed R3 of the take-up roller 35 with the counters 41 and 42.
Is calculated based on the count value of the inner rotor 10
Is calculated. Then, a command signal based on the calculated rotation speed R2 is output to the D / A converter 48.

The D / A converter 48 has a full bit of 10
Since the voltage is adjusted so as to give a speed instruction of 10,000 rpm, the CPU 38 reduces the obtained rotation speed R2 to 100,000 rpm.
Output as a relative value to m. Since the D / A converter has a resolution of 20 bits, the D / A converter code SR2 is given by the following equation. Note that FFFFF ₁₆ is 1
It is a hexadecimal display.

SR 2 = FFFFFF ₁₆ × R 2/100000 Then, a voltage corresponding to the command signal of the CPU 38 is output from the D / A converter 48 to the servo amplifier 37, and the inner rotor 10 is driven at a predetermined rotation speed R 2 by the servo motor 11.
Is driven to rotate. The servo amplifier 37 performs feedback control of the servomotor 11 so as to achieve the designated rotation speed, and follows the designated rotation speed with high accuracy.

Next, a method of calculating the rotation speed R1 of the outer rotor 6 will be described. The calculation of the rotation speed is performed by measuring the pulse period. The output pulse signal of the magnetic sensor 33 is input to the first counter 41 after being divided by the frequency dividing circuit 43. Further, the reference clock of the reference clock oscillator 45 is input to the first counter 41. And the first
Counter 41 is synchronized with the output pulse of the frequency dividing circuit 43, and as shown in FIG. 5, from the rising of the pulse signal after the dividing to the next rising, that is, between one pulse (one period T1). The number of input pulses of the reference clock oscillator 45 is counted.

The first buffer of the two counting buffers provided in the first counter 41 first counts the number of reference clocks during one pulse and latches the value. Next, the second buffer counts the number of reference clocks during the next one pulse and latches the value. While the second buffer is counting the number of reference clocks for one pulse, the data (count value) latched in the first buffer is output to the CPU 38, and the reference for one pulse by the second buffer is output. After counting the number of clocks, the first buffer starts counting the number of reference clocks during the next pulse. While the first buffer is counting the number of reference clocks during one pulse, the data (count value) latched in the second buffer is
Output to PU38. Hereinafter, similarly, the first and second
Are alternately output to the CPU 38, and the reference clock is continuously measured.

The CPU 38 calculates the period T1 of the output pulse of the frequency dividing circuit 43 by the product of the count value N1 of the first counter 41 and the period Tc of the reference clock. Next, the rotational speed R1 of the outer rotor 6 is calculated from the product of the reciprocal of the cycle T1 and the reciprocal of the frequency division ratio. For example, if the frequency division ratio is 1 / s, R1 = (1 / T1) s.

Similarly, the number of reference clocks input during one pulse of the output pulse of the frequency dividing circuit 44 is continuously measured by the second counter 42. The CPU 38 calculates the cycle T of the output pulse of the frequency dividing circuit 44 by the product of the count value N2 of the second counter 42 and the cycle Tc of the reference clock.
2, the rotation speed R3 of the take-up roller 35 is calculated from the product of the reciprocal of the cycle T2 and the reciprocal of the frequency division ratio.

The reference clock is 1 MHz and the dividing ratio is 1/1
6, the rotation speed of the outer rotor 6 is 90000r
The accuracy in pm is (1/10 ⁶ ) / [｛1 / (9000
0/60)｝ 16] = 0.000093, almost 0.0
1%.

Since the counters 41 and 42 are 32 bits wide, the measurable low-speed rotation speed is (10 ⁶ × 60 × 1).
6) / 2 ³² ≒ 0.22 rpm. This embodiment has the following effects.

(A) The rotation speed R1 of the outer rotor 6 is directly detected by the magnetic sensor 33 for each weight, and the detection signal of the magnetic sensor 33 and the rotation encoder 36 for detecting the rotation speed R3 of the take-up roller 35 are detected. An appropriate rotation speed R2 of the inner rotor 10 is calculated based on the detection signal, and the servomotor 11 is controlled for each weight so as to achieve the rotation speed R2. Therefore, the outer rotor 6 and the inner rotor 10 can be driven synchronously with high accuracy for each weight.

(B) Since the end of the shaft (rotating shaft) 9 of the inner rotor 10 is assembled to the rotor 12 of the servomotor 11 so as to be integrally rotatable, the device becomes compact. In addition, the labor for centering is simplified as compared with the case where the shaft 9 of the inner rotor 10 is connected to the output shaft of the independent servo motor 11.

(C) The calculation of the rotational speeds of the outer rotor 6 and the take-up roller 35 is performed by counting the number of pulses output from the reference oscillator while a predetermined number of pulse signals are output from the magnetic sensor 6 and the rotary encoder 36. It is made based on. Therefore, by reducing the period of the output pulse of the reference oscillator (to increase the frequency), the accuracy of detecting the rotational speed can be easily increased. As a result, the inner rotor 10 can be driven synchronously with the outer rotor 6 with high accuracy.

(D) The CPU 38 controls the outer rotor 6 based on the number of output pulses of the reference oscillator counted by the counters 41 and 42 during one pulse of the output pulse signal of the magnetic sensor 33 and the rotary encoder 36 after the frequency division. And the rotation speed of the take-up roller 35 is calculated. Accordingly, by setting the frequency division ratio in accordance with the control cycle of each weight, the CPU 38 controls the inner rotor 1 of each weight.
Data required for calculating the rotation speed of 0 (each counter 4
1, 42 count values) can be obtained immediately, and the calculation can be performed efficiently.

(E) Since each of the counters 41 and 42 is a double buffer system, continuous measurement is possible, and the CPU
Data can be obtained whenever 38 requires a count value.

(F) As a reference oscillator, a computer reference clock oscillator essential for the operation of the CPU 38 is used. Therefore, it is not necessary to newly provide a reference oscillator for each of the counters 41 and 42.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) As shown in FIG. 6, two detected portions 50 made of permanent magnets are symmetrically fixed to the outer rotor 6 on the side opposite to the open side. Then, a magnetic sensor 33 is disposed on the casing 29 at a position facing the rotation locus of the detected part 50. In this case, two pulses are output from the magnetic sensor 33 every one rotation of the outer rotor 6. If the lengths of the rotor shafts 5 and 9 are long, it is difficult to make the resonance point of the rotor unit higher than the number of rotations used. When the rotor shaft 5 and the shaft 9 are shortened, the magnetic sensor 33 is connected to the detected portion 32 provided at the second end of the rotor shaft 5.
It is difficult to dispose it at a position where it can be detected. But,
With this configuration, even if the lengths of the rotor shaft 5 and the shaft 9 are shortened, it is easy to secure the arrangement position of the magnetic sensor 33. The number of the detected parts 50 is not limited to two, but may be one or three or more.

(2) As shown in FIG. 7, the servo motor 11 and the thrust bearing are integrated. That is,
At the rear (left side in FIG. 7) of the motor housing 51, a housing 5 for housing the ball 18 and the oil supply member 17 is provided.
2 is formed, and an oil case 53 for storing oil is detachably fixed below the housing portion 52. The oil case 53 is screwed to the motor housing 51 at a female screw portion (not shown) formed on the upper inner surface.

The ball 18 is supported between the second end of the shaft 9 that penetrates the wall of the housing 52 and protrudes into the housing 52 and the tip of the adjusting screw 19. Adjustment screw 19
Of the ball 18 is formed to have a curvature substantially equal to the curvature of the ball 18. The oil supply member 17 is made of felt or string, and is partially immersed in oil and partially
Is in contact with Then, the balls 18 are lubricated with oil in the oil case 53 supplied through the oil supply member 17. Ball 1 receiving the thrust force of shaft 9
If the ball 8 is worn, the adjusting screw 17 is tightened to move the position of the ball 18 toward the shaft 9 to adjust the contact state between the shaft 9 and the ball 18. To change the lubricating oil, the oil case 53 is removed from the motor housing 51 and the oil inside is replaced.

When the outer rotor 6 and the inner rotor 10 are rotated at a high speed, the resonance point of the rotor unit needs to be higher than the number of rotations used. For that purpose, it is necessary to make the rotor shaft 5 and the shaft 9 as described above as short as possible. In the case of this configuration in which the thrust bearing is integrated with the servomotor 11, the rotor shaft 5 and the shaft 9 can be shortened as compared with the case where the thrust bearing 15 and the servomotor 11 are separated. As a result, the use rotation speed can be made higher.

The thrust bearing 15 and the servo motor 1
When the shaft 1 and the shaft 1 are separated from each other, it is necessary to perform two centering operations of centering the motor with respect to the shaft 9 and centering the thrust bearing 15 with the ball 18. However, in this configuration, only one centering operation is required, and the number of steps is reduced.

(3) The number of pairs of the N pole and the S pole formed in the detected portion 32 may be two or more. Rotor shaft 5
The number of pulses output from the magnetic sensor 33 for each rotation of the number is the same as the number of sets.
Are output.

(4) First and second counters 41 and 4
A reference oscillator dedicated to the counters 41 and 42 may be provided as the reference oscillator for 2 without sharing the reference clock oscillator 45 of the computer. In this case, the frequency of the reference oscillator can be increased regardless of the capability of the computer, and the rotation speed can be measured with high accuracy.

(5) Instead of a configuration in which the end of the shaft 9 of the inner rotor 10 is integrally rotatably mounted on the rotor 12 of the servomotor 11, an independent servomotor is used as the servomotor for driving the inner rotor 10. You may.

(6) The resolution of the D / A converter 48, the bit width of the counters 41 and 42, or the frequency dividing circuit 43
The frequency division ratio of 44 may be changed to one other than the above-described embodiment in accordance with desired accuracy.

(7) The counters 41 and 42 may be of a type other than the double buffer type. (8) Instead of a contact-type thrust bearing, a non-contact-type thrust bearing, for example, one utilizing a repulsive force of a magnet or one utilizing the action of compressed air may be used as the thrust bearing.

(9) The shape of the inner rotor 10 is not limited to a disk shape, but may be any shape that can maintain a dynamic balance during rotation. Further, the shape of the yarn path 22 and the shape of the guide member 23 may be appropriately changed. The inventions other than those described in the claims that can be grasped from the embodiment and the modified examples will be described below together with their effects.

(1) In the invention described in claim 4 or 5, the counter is a double buffer type.
In this case, the number of pulses corresponding to the rotation speed of the outer rotor and the yarn pull-out roller can be continuously measured.

(2) In a double-rotor open-end spinning machine, a thrust ball bearing for receiving the thrust force of the shaft of the inner rotor is formed integrally with the housing of the motor for driving the inner rotor provided for each weight. In this case, the shaft can be shortened as compared with a case where the thrust bearing and the motor for driving the inner rotor are separated from each other, and the rotational speed can be further increased.

(3) In the thrust ball bearing of (2), an oil case for storing oil to be supplied to the ball via an oil supply member is detachably fixed to the housing. In this case, replacement of the lubricating oil is facilitated.

[0073]

As described in detail above, claims 1 to 4 are provided.
According to the invention described in (1), the outer rotor and the inner rotor can be driven synchronously with high accuracy for each weight.

According to the second aspect of the present invention, the end of the rotation shaft of the inner rotor is assembled to the rotor of the servomotor so as to be integrally rotatable, so that the apparatus is compact.
In addition, as compared with the case where the rotation shaft of the inner rotor is connected to the output shaft of the independent servo motor, the trouble of centering is simplified.

According to the third aspect of the invention, by reducing the period of the output pulse of the reference oscillator (to increase the frequency), it is possible to easily increase the accuracy of detecting the rotational speed of the outer rotor and the yarn pull-out roller. The inner rotor can be driven synchronously with the outer rotor with high accuracy.

According to the fourth aspect of the present invention, the rotational speeds of the outer rotor and the yarn pull-out roller can be efficiently calculated by setting the frequency dividing ratio in accordance with the control cycle of each weight. According to the fifth aspect of the present invention, since the reference clock oscillator of the microprocessor constituting the arithmetic means is used as the reference oscillator for the counter, it is not necessary to newly provide a reference oscillator for each counter.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an open-end spinning machine according to an embodiment.

FIG. 2A is a partial cross-sectional view of the outer rotor viewed from the opening side, and FIG. 2B is a cross-sectional view of the inner rotor.

FIG. 3 is a schematic perspective view of a detected part.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 is a diagram showing a reference clock and output pulses of a frequency dividing circuit.

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

FIG. 7 is a partial sectional view of another modification.

FIG. 8 is a schematic sectional view of a conventional device.

[Explanation of symbols]

Reference numeral 5: a rotor shaft as a rotating shaft; 6, an outer rotor; 6a, a fiber bunching portion; 7, a drive belt; 9, a shaft; 10, an inner rotor; 11, a servomotor;
Rotor, 27: thread extraction passage, 32, 50: detected part,
33 ... magnetic sensor, 34 ... control device as control means,
35 ... take-up roller as a yarn pull-out roller, 3
6 ... Rotary encoder as rotation speed detecting means, 3
8. CPU as arithmetic means and microprocessor,
41 ... first counter, 42 ... second counter, 45 ...
Reference clock oscillator as a reference oscillator, Y ... thread.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D01H 4/44 D01H 4/12 D01H 4/14

Claims (5)

(57) [Claims] 1. An outer rotor having a fiber bundle where fibers are bundled, an inner rotor for guiding a yarn drawn from the fiber bundle to an end of a yarn drawing path is provided coaxially with the outer rotor, and the inner rotor is provided. In the rotor type open-end spinning machine capable of positively driving independently of the outer rotor, a servo motor for driving the inner rotor to rotate for each weight, and a magnetization provided on a rotating shaft that rotates integrally with the outer rotor or the outer rotor. A magnetic sensor that detects the detected portion to detect the rotation speed of the outer rotor, a rotation speed detection unit that detects the rotation speed of the yarn pull-out roller, and the magnetic sensor and the rotation speed detection unit based on the detection signals. The proper inner rotor corresponding to the rotation speed of the outer rotor and the yarn pull-out roller Rolling a calculating means for calculating a velocity, the computed rotor drive device of the rotor type open-end spinning machine and a control means for said at a rotational speed inner rotor to control the servo motor to rotate. 2. The rotor drive device for a rotor-type open-end spinning machine according to claim 1, wherein an end of a rotation shaft of the inner rotor is integrally rotatably mounted on a rotor of the servomotor. 3. The magnetic sensor and the rotational speed detecting means output pulse signals corresponding to the number of rotations of the outer rotor and the yarn pull-out roller, respectively. The arithmetic means outputs a predetermined number of pulse signals from the magnetic sensor and the rotational speed detecting means. 3. The rotor drive of a rotor-type open-end spinning machine according to claim 1, wherein the rotation speeds of the outer rotor and the yarn pull-out roller are calculated based on a count value of the number of pulses output from the reference oscillator during the output. apparatus. 4. The calculation means divides the output pulse signal of the magnetic sensor and the rotation speed detection means and counts the number of pulses output from the reference oscillator during one pulse of the divided pulse signal. 4. The rotor drive device for a rotor-type open-end spinning machine according to claim 3, wherein the rotational speeds of the outer rotor and the yarn pull-out roller are calculated based on a count value of a counter. 5. The rotor drive device for a rotor-type open-end spinning machine according to claim 3, wherein the arithmetic means is constituted by a microprocessor, and the reference oscillator is a reference clock oscillator of the microprocessor.