JP2004001980A - Power failure dealing system of automatic winder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the rubbing of a bobbin from occurring in stopping each thread unwinding unit when a power failure occurs in an automatic winder. <P>SOLUTION: When a power failure detecting section 29 detects a power failure, a motor 21 performs speed reduction and stop control. The regenerative electric power generated this speed reduction and stop control is supplied to a unit control section 27 from a regenerative electric power generating section 30. The unit control section 27 activates a lift up mechanism 2a to separate a package P from a unwinding drum 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power failure processing system for an automatic winder having a large number of yarn winding units driven by a single spindle.
[0002]
[Prior art]
The automatic winder has a large number of yarn winding units driven by a single spindle arranged on a machine base. One yarn winding unit has a function of winding a yarn unwound from a yarn supplying bobbin produced by a ring spinning machine into a package having a predetermined shape while removing yarn defects.
[0003]
Each yarn winding unit is provided with a DC brushless motor that rotationally drives a winding drum, a motor control unit that controls the rotational driving of the DC brushless motor, and a unit control unit that controls the motor control unit. At one end of the machine base, a main control unit for controlling a number of winding units arranged in a line is provided. The main control unit is provided with a system power supply, and a large number of unit control units and motor control units are operated by power supplied from the system power supply.
[0004]
When a power failure occurs in such an automatic winder, the supply of power from the system power supply is cut off, so that a number of yarn winding units are stopped. At this time, the power failure is detected by the main control unit, the power failure is transmitted to each unit control unit by a dedicated signal line, and the yarn winding units perform the thread cutting simultaneously, and then the DC brushless motor is free-run. A device that stops the operation has been proposed (see Japanese Patent No. 3005622).
[0005]
[Problems to be solved by the invention]
As described above, after the yarn is cut by each of the yarn winding units, when the winding drum and the package are stopped by free running, the winding drum and the package are rubbed, and the balls are rubbed (the bar winding portion of the package center after the yarn cutting). (A phenomenon in which the thread is rubbed and twisted).
[0006]
An object of the present invention is to provide a power failure processing system for an automatic winder that can prevent occurrence of rubbing balls when a power failure occurs in an automatic winder and each yarn winding unit is stopped.
[0007]
[Means for Solving the Problems]
The present invention according to claim 1, which achieves the above object, includes a motor that rotationally drives a winding drum,
A lift-up mechanism provided on a cradle supporting a package that rotates in contact with the winding drum,
A motor control unit that controls the rotational drive of the motor,
A unit controller that controls the motor controller and the lift-up mechanism;
A power failure detection unit that detects a power failure to these control units,
A regenerative power generation unit that generates regenerative power by deceleration stop control by the motor control unit based on the power failure detection of the power failure detection unit,
The lift-up mechanism is operated when a power failure occurs, using the power from the regenerative power generation unit.
[0008]
According to the above configuration, when the power failure detection unit detects the power failure, the motor is controlled to decelerate and stop, so that the motor quickly stops. Regenerative power generated by the deceleration stop control is supplied from the regenerative power generation unit to the unit control unit. The unit control unit operates the lift-up mechanism with the supplied regenerative electric power to separate the package from the winding drum. When the motor stops and there is no regenerative power, the lift-up mechanism does not operate, and the package contacts the winding drum.
[0009]
According to a second aspect of the present invention, in the first aspect, a package brake mechanism for the package is provided, the package brake mechanism being controlled by the unit control unit, and power from the regenerative power generation unit is provided by: The package brake mechanism is operated when a power failure occurs.
[0010]
According to the above configuration, the package brake mechanism also operates simultaneously with the operation of the lift-up mechanism, so that the package is separated from the winding drum and the rotation of the package is stopped.
[0011]
According to a third aspect of the present invention, in the first aspect, the power failure detection unit is provided in the motor control unit.
[0012]
According to the above configuration, the motor control unit detects the power failure, and the motor control unit can generate the regenerative power by the stop control almost simultaneously with the power failure detection.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a device layout diagram of a yarn winding unit of an automatic winder, and FIG. 2 is a front view showing a structure of a fluff binding device.
[0014]
As shown in FIG. 1, the yarn winding unit U of the automatic winder 1 winds a spun yarn Y unwound from a yarn supplying bobbin B on a bobbin Bf while traversing the yarn to form a package P having a predetermined length and a predetermined shape. Things. The automatic winder 1 is configured by arranging a large number of such yarn winding units U on a machine base (not shown).
[0015]
The yarn winding unit U includes a cradle 2 for gripping the bobbin Bf and a traverse drum (winding drum) 3 for traversing the spun yarn Y. The cradle 2 is swingable toward the traverse drum 3, whereby the package P wound around the bobbin Bf is brought into contact with or separated from the traverse drum 3. The cradle 2 has a lift-up mechanism 2a that raises the cradle 2 when the yarn breaks to separate the package P from the traverse drum 3, and simultaneously raises the cradle 2 and simultaneously rotates the package P gripped by the cradle 2. A package brake mechanism 2b for stopping is attached. The operations of the lift-up mechanism 2a and the package brake mechanism 2b are controlled by the unit controller 27.
[0016]
The traverse drum 3 has a spiral traverse groove 3a formed on its surface to traverse the spun yarn. The traverse drum 3 is driven to rotate by a DC brushless motor 21. The traverse drum 3 and the drive shaft of the DC brushless motor 21 are connected by either direct connection, connection via a coupling, or connection via a pulley and a belt. The rotational drive of the DC brushless motor 21 is controlled by the motor control unit 25.
The yarn winding unit U includes, in the yarn traveling path between the yarn supplying bobbin B and the traversing drum 3, a yarn unwinding assisting device 4, a tension applying device 5, a fluff binding device in order from the yarn supplying bobbin B. 6, a piecing device 7, and a clearer (yarn thickness detector) 8 are provided.
[0018]
The unwinding assisting device 4 assists the unwinding of the yarn from the yarn supplying bobbin B by lowering the cylindrical body covering the core tube together with the unwinding of the yarn supplying bobbin B.
The tension applying device 5 applies a predetermined tension to the traveling spun yarn Y. In the illustrated example, a gate type in which the movable comb teeth 5b are arranged with respect to the fixed comb teeth 5a is used. The comb teeth 5b are rotatable with respect to the comb teeth 5a so as to be in an engaged state or a released state, and the rotation is performed by a rotary solenoid 5c. The tension applying device 5 also functions as a twist preventing device of the fluff binding device 6 by engaging the movable comb teeth 5b with the fixed comb teeth 5a.
[0019]
The fluff binding device 6 twists the spun yarn Y, thereby twisting the fluff of the fiber group constituting the spun yarn Y and suppressing the fluff of the spun yarn Y unwound from the yarn supplying bobbin B. Things. In the illustrated example, a disk type in which a plurality of disks 6a are overlapped in the axial direction is used.
[0020]
As shown in FIG. 2, the first drive shaft 6b, the second drive shaft 6c, and the third drive shaft 6d, which are parallel to the yarn path, are positioned at the vertices a, b, and c of the equilateral triangle when viewed from above. It is arranged in. A plurality (two in the illustrated example) of disks 6a are attached to each of the drive shafts 6b, 6c, 6d in such a size that the disks 6a partially overlap in the radial direction. . Each disk 6a is arranged in the axial direction from the bottom in the order of a third drive shaft 6d, a second drive shaft 6c, a first drive shaft 6b, a third drive shaft 6d, a second drive shaft 6c, and a first drive shaft 6a. They are staggered alternately.
Each drive shaft 6b, 6c, 6d is rotated in the same direction by a DC brushless motor 22 (see FIG. 1). The rotational drive of the DC brushless motor 22 is controlled by a motor control unit 26 (see FIG. 1). As shown in FIG. 2B, the spun yarn Y is passed through the central portion A where the disks 6a overlap, and the spun yarn Y bent zigzag in contact with each disk 5a is subjected to false twist. , Fuzz is suppressed.
[0021]
As shown in FIG. 1, a clamp 6g for the spun yarn Y is provided downstream (upper side) of the fluff binding device 6. When the yarn is cut or broken, the clamp 6g is operated to prevent the winding of the yarn around the fluff binding device 6. The clamp 6g is operated by the solenoid 6f, and the operation of the solenoid 6f is controlled by the unit controller 27.
[0022]
The yarn splicing device 7 splices the lower yarn on the yarn supplying bobbin B and the upper yarn on the package P when the yarn is cut by detecting a yarn defect or when the yarn breaks during unwinding. .
The clearer 8 is for detecting a thickness defect of the spun yarn Y. A signal corresponding to the thickness of the spun yarn Y from the clearer 8 is processed by the analyzer 8b to detect a yarn defect such as a slab.
The clearer 8 is provided with a cutter 8a for cutting the yarn when a yarn defect is detected. The operation of the cutter 8a is controlled by the analyzer 8b or the unit control unit 27.
Electric power for operating the cutter 8a is charged in a condenser of the clearer 8.
[0023]
Above and below the piecing device 7, a lower thread catching and guiding means 11 for catching and guiding the lower thread on the yarn feeding bobbin B side and an upper thread catching and guiding means 12 for capturing and guiding the upper thread on the package P side. Is provided.
At the time of thread cutting or thread breakage, the suction port 11a of the lower thread catching and guiding means 11 catches the lower thread at the position shown in FIG. Guide the thread. At the same time, the mouse 12a of the upper thread catching and guiding means 12 pivots from the position shown in the figure to the upper side about the axis 12b, captures the upper thread from the package P which is reversed, and further moves upwardly about the axis 12b. To guide the upper thread to the piecing device 7. The lower thread and the upper thread drawn by the piecing device 7 are spliced using a swirling airflow.
[0024]
Motor control unit 25 of DC brushless motor 21 for traverse drum 3, motor control unit 26 of DC brushless motor 22 for fluff binding device 6, lift-up mechanism 2a and package brake mechanism 2b, analyzer 8b for cutter 8a, clamp Control of the 6 g solenoid 6 f and the solenoid 5 c of the tension applying device 5 is performed by the unit control unit 27.
The unit control section 27 corresponding to each of the yarn winding units U is controlled by the main control section 28. The main controller 28 is provided with a system power supply 31. The unit control section 27 of each of the yarn winding units U is connected to the system power supply 31, and the motor control sections 25, 26 and the like are connected to the unit control section 27, so that each device operates.
[0025]
Next, the configuration of the above-described power failure processing system of the automatic winder 1 will be described. FIG. 3 is a functional block diagram of the power failure processing system.
[0026]
In FIG. 3, the power failure processing system S of the automatic winder includes a DC brushless motor 21 for the traverse drum 3, a motor control unit 25 of the motor 21, and a unit control unit 27.
[0027]
The unit control unit 27 controls the cutter 8a via the analyzer 8b, controls the lift-up mechanism 2a and the package brake mechanism 2b, and controls the clamp 6g via the solenoid 6f.
[0028]
The motor control unit (motor driver) 25 includes a speed control unit 35, an instantaneous stoppage control unit 36, an output unit (drive circuit) 37, a serial connection of a power circuit (switching circuit) 38, and a power circuit 38. , A bus voltage detection circuit 40 for the DC power supply 39 connected to the power supply 39, a bus voltage monitoring unit 41 connected between the bus voltage detection circuit 40 and the instantaneous interruption control unit 36, and a speed control unit 35. Instantaneous stop control command 42. Each function of the motor control unit 25 described below is mainly realized by a central processing unit such as a CPU. The bus voltage detection circuit 40, the bus voltage monitoring unit 41, and the like form a power failure detection unit 29 provided in the motor control unit 25. Further, the instantaneous stop control unit 36, the output unit 37, and the like form the regenerative power generation unit 30.
[0029]
The output unit 37 switches the energization of the armature winding based on the rotor position detection signal output from the magnetic pole position detection center 43, generates a PWM signal, and outputs a drive signal to the power circuit 38. By performing the PWM control on the switching element in this manner, the DC brushless motor 21 is rotationally driven.
[0030]
The speed control unit 35 includes a target speed input from the main control unit 28 to the speed control unit 35 via the unit control unit 27, and a rotation speed (currently calculated based on a signal input from a rotation speed detector not shown). A duty amount for adjusting the power (torque) supplied to the DC brushless motor 26 is calculated based on the deviation from the speed (speed), and a duty command is output to the output unit 25.
[0031]
When a power failure is detected, the instantaneous power failure control unit 36 performs predetermined brake control instead of speed control based on the difference between the target speed and the current speed, and generates regenerative power. The predetermined brake control has two deceleration modes (1) and (2). Which of the two deceleration modes is adopted is determined by the instantaneous power failure control command 42 output from the main control unit 28 to the instantaneous power failure control unit 36 via the unit control unit 27. As shown in FIG. 5, the operation command command output to the speed control unit 35 includes a command byte in addition to various operation conditions as shown in FIG. The 7th and 6th bits of the command byte include an operation code as shown in FIG. 5 (b), and the 5th bit is a deceleration mode which can be switched by the instantaneous stop control as shown in FIG. 5 (c). Either 1) or deceleration mode 2) is included.
[0032]
The bus voltage monitoring unit 41 performs A / D conversion of the voltage of the DC power supply 39 detected by the bus voltage detection circuit 40, and when the voltage falls below a predetermined reference value for a predetermined time, determines that the power failure includes an instantaneous power failure, and outputs a power failure signal. Is output to the instantaneous stop control unit 36 and the unit control unit 27.
[0033]
With the above configuration, the motor control unit 25 of the DC brushless motor 21 for the traverse drum 3 detects a power failure, and immediately controls the deceleration according to the momentary power failure control command 42 at the time of detection without waiting for a command from the unit control unit. Is performed, thereby generating regenerative power, and the regenerative power is supplied to each of the devices 2a, 2b, and 6f via the unit control unit 27.
[0034]
The deceleration mode (1) or the deceleration mode (2) switched by the instantaneous stop controller 36 is as follows, and is selectively used depending on the rotation speed of the traverse drum 3. That is, the deceleration mode (1) or (2) in FIG. 5 (c) is automatically determined by the set speed of the operation command in FIG. 5 (a).
[0035]
The deceleration mode (1) is selected during high-speed rotation, for example, when the rotation speed of the traverse drum 3 exceeds 4000 rpm. This deceleration mode (1) is deceleration control performed while calculating the duty ratio in accordance with PI control or PID control. For example, in the case of stopping from 8000 rpm in 0.8 seconds, the target speed is reduced by 100 rpm every 10 msec, and the speed is reduced to zero after 0.8 seconds. As shown in the upper part of FIG. 6A, regenerative power exceeding the rated voltage of 280 V is generated, and a two-dot chain line portion that becomes an overcurrent is discharged by the discharge circuit, and the regenerative power is kept constant so as not to exceed the upper limit. I do.
[0036]
The deceleration mode (2) is selected during medium or low-speed rotation, for example, when the rotation speed of the traverse drum 3 is 4000 rpm or less. At the time of middle or low-speed rotation, sufficient regenerative power cannot be obtained in the deceleration mode (1), so that the motor is decelerated and stopped in a deceleration pattern in which regenerative energy is particularly large and is generated quickly. Specifically, the duty ratio is temporarily set to zero (the on-time and the off-time are 1: 1), and the three phases U, V, and W are reversed in reverse order (reversely, the motor is stopped). Is a deceleration control performed while calculating the duty ratio in accordance with the PI control or the PID control.
[0037]
Next, the operation of the above-described power failure processing system S will be described. FIG. 4 is a flowchart of the power failure process. The flow of the power failure process in FIG. 4 will be described with the device block diagram in FIG.
[0038]
In S1 of FIG. 4, the unit control unit 27 transmits the instantaneous power failure control selection code 1 or 0 to the motor control unit (driver) 25 as a start operation command command. The driver 25 holds this code in the instantaneous power failure control command 42.
In S2, the rotational drive of the DC brushless motor 21 is controlled by the PI control of the speed control unit 36 so as to maintain the set speed.
In S3, when the power failure detection unit 29 held by the motor control unit 25 itself detects a power failure (S3, YES), in S4, the instantaneous power failure control unit 36 starts deceleration stop control.
At this time, the power failure signal is transmitted to the analyzer 8b via the unit control unit 27. When the yarn winding unit U is winding, the cutter 8a is operated by this power failure signal to cut the yarn being wound. The power for operating this cutter is charged in the condenser inside the clearer 8 and operates most without regenerative power.
[0039]
In S5, the instantaneous stop control unit 36 determines whether the instantaneous stop control selection code is zero. If the code is zero (S5, YES), the {circle around (1)} deceleration mode during high-speed rotation is adopted, and the normal control for calculating the duty ratio is performed in accordance with the PI control in S6. If the code is not zero (S5, NO), the (2) deceleration mode during middle or low speed rotation is adopted. First, in S7, the duty ratio is calculated by PI control, and it is determined whether the duty ratio is positive. When the duty ratio is not positive, that is, when the duty ratio is negative (negative phase) (S7, NO), normal control for calculating the duty ratio is performed according to the PI control in S6. If the duty ratio is positive (S7, YES), the PI control is performed after setting the duty ratio to zero in S8 to reverse the phase.
[0040]
By the deceleration stop control in S6 or S8, the winding drum 3 moves toward the deceleration stop, and regenerative electric power is generated. The regenerative electric power is transmitted from the DC power supply 39 of the motor control unit 25 via the unit control unit 27 to the devices 2a, 2b, 6f to activate it.
[0041]
In S10, the lift-up mechanism 2a and the package brake mechanism 2b operate the cradle lift-up for separating the package P from the winding drum 3 and the package brake for stopping the rotation of the package P separated from the winding drum 3.
At the same time as S10, in S11, the clamp 6g downstream of the yarn binding device 6 is turned on, and the spun yarn Y at the exit of the yarn binding device 6 is gripped.
In S12, the deceleration stop control is continued until the motor stops (S12, NO). When the motor stops (S12, YES), no regenerative power is generated.
Then, as in S13 and S14, the lift-up mechanism 2a, the package brake mechanism 2b, and the solenoid 6f for clamping stop operating, the package brake is turned off, the cradle lift is lowered, and the clamp 6g also releases the thread. However, at this time, since the yarn winding unit U is in the stopped state, no trouble occurs.
[0042]
FIG. 6 shows this deceleration stop state. FIG. 6A shows a deceleration control state by normal PI control during high-speed rotation. Due to the high speed rotation of the traverse drum 3 due to the overcurrent, sufficient regenerative power is generated, and the motor control unit 25 is not damaged. FIG. 6B shows a deceleration control state by PI control in the opposite phase at the time of low-speed rotation. Even if the traverse drum 3 rotates at a low speed, regenerative electric power required for cradle lift-up is generated.
[0043]
The effects of the above-described embodiment will be described below.
(1) Even if the power supply to the unit control unit 27 is stopped at the time of the power failure and the yarn winding unit U cannot continue to operate, first, the yarn is cut by the clearer 8 having its own power. Thereafter, the lift-up mechanism 2a and the package brake mechanism 2b are operated by the regenerative electric power generated by the deceleration stop control of the DC brushless motor 21 for the winding drum 3. Therefore, the package P is separated from the traverse drum 3 until the deceleration stop, and the rod winding portion after the thread cutting is not rubbed by the traverse drum 3 so that no rubbing balls are generated. Will not give.
[0044]
(2) Since the power failure detection is performed by monitoring the power supply in the motor control unit 25 that generates regenerative electric power, the motor control unit 25 does not wait for a stop command from the unit control unit 27, and Controls immediate deceleration stop. For this reason, it takes less time to communicate until a deceleration stop command is received from the unit controller 27, and the phenomenon that sufficient regenerative power cannot be obtained does not easily occur.
[0045]
(3) When the fluff binding device 6 for false-twisting the spun yarn with the disk 6a is used, the lower thread after the yarn cutting may be wound around the disk 6a before the rotation of the disk 6a is stopped at the time of power failure. At the time of the power failure, the regenerative power activates the clamp 6g downstream of the fluff binding device 6, so that the lower thread does not wind around the fluff binding device 6.
[0046]
(4) According to the rotation speed of the traverse drum 3, at the time of high-speed rotation at which sufficient regenerative power can be obtained, deceleration control by ordinary PI or PID control is performed. Thus, the required regenerative electric power is generated by deceleration control by PI or PID control. Therefore, it is possible to avoid a situation in which the package cannot be lifted up due to damage to the motor control unit 25 due to an overcurrent or insufficient regenerative power.
[0047]
The embodiment described above can be modified and implemented as follows.
(1) When the fluff binding device 6 is used, it is preferable that the motor controller 26 also performs the same deceleration stop control as the motor controller 25. When the disk 6a of the fluff binding device 6 is stopped by free running, it takes time to stop, and the upper thread is prevented from being wound after the clamp 6a is turned off.
[0048]
(2) The fluff binding device 6 is not limited to the disk type, and may be a nip type in which two rollers intersect. Further, the yarn winding unit U without using the fluff binding device 6 may be used. In this case, there is no device attached to the fluff binding device 6.
[0049]
(3) Of the lift-up mechanism 2a and the package brake mechanism 2b for the cradle 2, the package brake mechanism 2b employs a logic that naturally applies a brake due to a power failure, so that only the lift-up mechanism 2a operates with regenerative power. It can be.
[0050]
(4) The power failure detection unit 29 is not limited to the one provided in the motor control unit 25, and the main control unit 28 detects a power failure of the system power supply 31 and transmits the power failure to the motor control unit 25 through a dedicated high-speed communication line. Is also good.
[0051]
(5) The automatic winder 1 is not limited to a type using a traverse drum having traverse grooves, and a winding type in which a traveling yarn traversed by a separate traverse device is wound on a package rotating in contact with the winding drum. It may be a taking mechanism. In addition, devices other than the tension applying device 5, the piecing device 7, and the clearer 8 can be freely installed, and there are occasions when the device is attached or not attached.
[0052]
(6) The motor that is the rotary drive source of the traverse drum is not limited to a DC brushless motor (synchronous AC motor), but may be a motor that generates regenerative power through deceleration stop control, for example, a DC servo motor.
[0053]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be obtained.
According to the first aspect of the present invention, since the package is lifted up from the traverse drum by using the regenerative electric power obtained by the deceleration stop control at the time of the power failure, it is possible to eliminate the occurrence of rubbing balls.
According to the invention of claim 2, the rotation of the package P can be stopped at the same time as the package is lifted up.
According to the third aspect of the invention, it is possible to generate a regenerative electric power required to lift up the package.
[Brief description of the drawings]
FIG. 1 is a device layout diagram of a yarn winding unit of an automatic winder.
FIG. 2 is a front view showing the structure of the fluff binding device.
FIG. 3 is a functional block diagram of a power failure processing system.
FIG. 4 is a flowchart of a power failure process.
FIG. 5 is a diagram showing contents of an operation command command from a main control unit.
FIG. 6 is a diagram illustrating operations of a motor and the like during a power failure process.
[Explanation of symbols]
Reference Signs List 1 automatic winder 2 cradle 2a lift-up mechanism 2b package brake mechanism 3 traverse drum (winding drum)
21 DC brushless motor (motor)
25 Motor control unit 29 Power failure detection unit 30 Regenerative power generation unit

Claims (3)

A motor for rotating and driving the winding drum;
A lift-up mechanism provided on a cradle supporting a package that rotates in contact with the winding drum,
A motor control unit that controls the rotational drive of the motor,
A unit controller that controls the motor controller and the lift-up mechanism;
A power failure detection unit that detects a power failure to these control units,
A regenerative power generation unit that generates regenerative power by deceleration stop control by the motor control unit based on the power failure detection of the power failure detection unit,
A power failure processing system for an automatic winder, which operates the lift-up mechanism when a power failure occurs, using power from the regenerative power generator. A package brake mechanism for the package, comprising: a package brake mechanism controlled by the unit controller, wherein the power from the regenerative power generator activates the package brake mechanism when a power failure occurs. The power outage processing system for an automatic winder according to claim 1. The power failure processing system of an automatic winder according to claim 1, wherein the power failure detection unit is provided in the motor control unit.

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