JPH07172692A - Driving control method for contact pressure roller - Google Patents

Abstract

PURPOSE:To eliminate influence of a difference between individuals of respective winders, and provide a package in a uniform winding posture by automatically correcting a slip generated in an electric motor to drive a contact pressure roller. CONSTITUTION:When a contact pressure roller 5 is driven by an electric motor 6, it is beforehand rotated in a condition where the contact pressure roller 5 is not contacted with a spindle 2, and a slip generated in the electric motor 6 at this time is calculated, and a rotation commanding frequency of the contact pressure roller 5 in winding is corrected according to the slip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control method for a contact pressure roller in a spindle drive type winder for winding a yarn such as synthetic fiber.

[0002]

2. Description of the Related Art In recent years, as the winding speed has increased, even in a spindle drive type winding machine, a pressure roller has been driven by an electric motor.

The above pressure contact roller is driven by an electric motor under open loop control so that the rotation speed corresponds to a set speed. When the spindle tightening the bobbin is rotated by the electric motor and the contact pressure roller is brought into contact with the bobbin to start winding the yarn, the rotation speed of the contact pressure roller is detected and the contact pressure roller is detected. The electric motor for driving the spindle is feedback-controlled so that the set speed is achieved.

The contact pressure roller described above has a slip of the electric motor alone, and also has a rotational resistance of the bearing of the bearing portion of the electric motor and a rotational resistance of the bearing of the bearing portion for supporting the roller. When the drive control of the electric motor is performed, the actual rotation speed of the contact pressure roller becomes slower than the command rotation speed to the electric motor, and the contact pressure roller is driven by the spindle correspondingly, and an extra load is applied to the package. There is a problem that the winding shape of the package becomes bad.

In addition to this, in the turret type winding machine in which the electric motor for driving the contact pressure roller is open-loop controlled, if the contact between the contact pressure roller and the package disappears at the time of yarn switching, the command rotation speed is reduced. Even if the number of revolutions of the actual contact pressure roller becomes slow, it is not corrected, and the yarn winding tension is reduced accordingly.

If the yarn is switched from the full-winding package to the empty bobbin in such a state, there is a problem that the yarn is wound around the roller on the upstream side of the winding machine and the yarn switching success rate is lowered. .

In order to solve the above-mentioned problems, the slip generated in the electric motor for driving the contact roller at the completion of the assembly of the winder is measured and converted into a correction constant, which is manually input to the control device and stored. I am letting you.

[0008]

However, since the slip characteristics of the electric motor alone and the rotational resistance of the bearing are different between the solids, the above-mentioned slip measurement and correction coefficient input are performed for each winder. Therefore, it requires a great deal of time and effort.

Since the correction coefficient is stored in the control device,
Even if the combination of the winding machine and the control device is changed, it is necessary to input the correction coefficient again.

Further, since there is a temperature difference between the bearing at the beginning of the operation, which is started from the stopped state, and the bearing when it is continuously operated for a long time, the rotational resistance is different and the slip of the electric motor is greatly changed. Further, the slip of the electric motor also changes due to the rotational resistance of the bearing changing with time.

Therefore, when a difference between the slip that has been measured and input in advance and the actual slip occurs, and the rotation speed of the contact roller decreases, the contact roller is rotated by the package, and the package is rotated. There is a problem that the winding shape of the is uneven.

On the contrary, when the rotation speed of the contact pressure roller increases, the contact pressure roller drives the package, which causes a problem that the electric motor generates heat or is damaged due to overload.

Further, in the turret type winding machine, there is a problem that the yarn winding tension changes during the yarn switching operation, which causes yarn breakage or winding of the yarn on the roller, which lowers the yarn switching success rate. Etc. could not be solved.

An object of the present invention is to solve the above-mentioned problems and to automatically eliminate the slippage of the electric motor for driving the contact roller so as to eliminate the influence of the individual difference of each winding machine and the change over time. To do.

[0015]

In order to solve the above-mentioned problems, the contact pressure roller drive control method according to the present invention uses a spindle drive type winder having an electric motor for driving the contact pressure roller to wind the yarn. At the time of thread hooking operation or thread switching operation to be started, the pressure roller is rotated by the electric motor without contacting the bobbin tightened by the spindle, and the slip generated in the electric motor at this time is calculated, and the rotation with respect to the electric motor is calculated. The command frequency is corrected based on the slip.

Further, the slip generated in the electric motor for driving the contact pressure roller is obtained by a calculation ignoring the contact detection roller rotation detection pulse number or the detected rotation speed and slip when the electric motor is rotated at a predetermined rotation speed. It is preferable that the calculation is performed by the number of pulses or the number of revolutions obtained, or by the command frequency value when the electric motor is rotated at a predetermined number of revolutions and the frequency value obtained by the calculation ignoring slip.

[0017]

1 is a schematic perspective view showing the overall construction of a spindle drive type winder according to the present invention. The winder has an electric motor 3 for driving and is rotatably installed on a machine frame 1. The bobbin tightening spindle 2, the traverse head 4 that vertically moves up and down along a guide (not shown) formed on the machine frame 1 above the spindle 2, and a driving electric motor 6. A contact pressure roller 5 rotatably mounted on the traverse head 4, a first detector 7 for detecting a spindle rotation speed installed at a rear portion of the electric motor 3, and an output shaft of the electric motor 6 installed in proximity to each other. The second detector 8 for detecting the rotation speed of the contact roller and the control device 9 for controlling the rotation speed of each electric motor.

The above-mentioned first detector 7 and second detector 8 use pulse pickups of optical type, magnet type, proximity type and the like.

The control device 9 described above has an input function, a storage function,
A microcomputer having a comparison calculation function, an operation command function, etc. is used.

The slip that occurs in the electric motor for driving the contact roller when the contact roller is rotated in the above-mentioned winder is caused by the winder being stopped when the winder is stopped for a long time and the bearings and the like are at a low temperature. It differs between when the operation is started and when the operation of the winder is continued for a predetermined period of time and the bearings etc. are at a high temperature and the winder is subsequently operated.

Therefore, it is necessary to calculate the slippage from the start of the turret for thread hooking and thread switching, and at the latest before the contact pressure roller starts contact with the winding package. As shown in FIG. In the machine, before starting the operation from the stopped state of the winding machine and completing the yarn hooking operation, after the winding is completed, the full bobbin and the empty bobbin are replaced and the yarn hooking operation is performed again to complete the operation. It is also possible to calculate the slip before starting, and in the turret type winder, before the yarn hooking operation for starting the winding is completed, the winding of the yarn is completed and the full bobbin is switched to the empty bobbin. The slip can also be calculated before.

On the other hand, in order to improve the threading success rate and thread switching success rate, the rotation speed of the spindle during threading or thread switching is set to be a value slightly higher than the winding speed. After the thread hooking operation is completed or the thread switching operation is completed, the steady winding speed is reduced.

Therefore, the slip generated in the electric motor 6 at the time of the first thread hooking operation and at the time of rotating the contact roller 5 at the time of the first thread switching operation is calculated by the winder at the thread hooking speed and the thread switching speed. And the contact pressure roller 5 is not in contact with the spindle 2.

First, a method of calculating slip will be described.

Taking the first threading operation as an example, the threading speed is [SI (m / min)], the diameter of the contact roller 5 is [DR (m)], and the number of poles of the electric motor 6 is [ p1], command frequency [RO1 (Hz)] ignoring slip
Is If the number of pulses per rotation of the pressure contact roller is [P1], the formula for calculating the number of pulses [RFP1 (pulses / sec)] corresponding to the thread hooking speed [SI] of the pressure contact roller is as follows. The street If the number of contact pressure roll rotation detection pulses is [RFP2 (pulse / sec)], the slip [η
The calculation formula for calculating F] is as follows.

[0026] The RFP1 of the above equation (2) is the RFP of the equation (3)
By substituting into 1, the slip [ηF] can be calculated from the command frequency [RO1 (Hz)] and the contact pressure roll rotation detection pulse number [RFP2 (pulse / sec)], and the calculation formula is as follows.

[0027] On the other hand, if the package diameter dimension is [DM (m)] and the number of poles of the spindle driving electric motor 3 is [p2], the command frequency [SF1 (Hz)] of the electric motor 3 is If the number of pulses per spindle rotation is [P2], the formula for calculating the number of pulses [SFP1 (pulses / sec)] corresponding to the yarn threading speed [SI] of the spindle is as follows. Can be expressed as

The contact pressure roller drive control operation in the above-described manual thread switching type winding machine will be described.

First, when an operation switch (not shown) is pressed to lower the traverse head 4 in the standby position and the contact pressure roller 5 stops at the slip measuring position having a predetermined distance from the spindle 2, the spindle driving device is driven. Electric motor 3
Then, the electric motor 6 for driving the contact pressure roller is activated to rotate the spindle 2 and the contact pressure roller 5.

At this time, the number of pulses of the output shaft of the electric motor 3 for driving the spindle sent from the first detector 7 in order to maintain the preset speed is calculated by the above-mentioned calculation formula (6) in the control device 9 in the controller 9. Pulse number [SFP1 (pulse /
sec)], the electric motor 3 is feedback-controlled.

On the other hand, the electric motor 6 for driving the contact pressure roll has a command frequency [RO1 (H
z)].

In this state, when the number of detection pulses [RFP2 (pulse / sec)] of the contact pressure roll rotation of the contact pressure roller 5 is detected by the second detector 8 and sent to the control device 9, the slip [ηF] is calculated. It is calculated by the equation (4) and stored in the control device 9.

Then, the threading speed [SI (m / min)]
The correction command frequency [RF1 (Hz)] for the electric motor 6 for driving the contact roller is calculated by the following formula (7) with the slip [ηF] added.

[0034] When the electric motor 6 is open-loop controlled by the above-mentioned correction command frequency [RF1 (Hz)] and the contact roller 5 rotates, the bobbin mounted on the spindle 2 is threaded.

When the yarn is wound around the bobbin and the winding is started, the electric motor 6 for driving the contact pressure roller causes the command contact roller frequency [OM] obtained by the following equation (8). (Hz)], open loop control is performed.

Here, the steady winding speed is [SM (m / min
)], The command contact roller frequency [OM (H
z)] is calculated as follows.

[0037] On the other hand, in the motor 3 for driving the spindle, the number of pulses of the output shaft of the motor 3 sent from the first detector 7 becomes equal to the steady winding speed [SM] of the spindle calculated by the following calculation formula (9). Corresponding pulse number [SMP (pulse / sec
)] Is controlled by feedback.

[0038] [DM] in the above calculation formula (9) is the package diameter dimension (m), which is the bobbin diameter dimension at the start of the yarn winding.

Here, the winding time is [T (min)], and the discharge amount of the polymer spun from the spinning machine (not shown) is [L].
(G / min)], the yarn winding width dimension is [W (m)], the package density is [ρ (g / m ³ )], and the bobbin diameter dimension is [DS (m)]. Dimensions [DM
(M)] is calculated by the following calculation formula (10).

[0040] When the yarn is wound on the basis of the above calculated value, the yarn layer is formed on the bobbin, and the outer peripheral portion of the yarn layer comes into contact with the contact pressure roller 5 to be in the steady winding state, the spindle is driven. In the motor 3, the number of pulses for detecting the rotation of the pressure contact roller corresponds to the steady winding speed [SM] of the pressure contact roller [RMP (H
z)] and feedback control is performed. The calculation formula for calculating the pulse number [RMP (Hz)] corresponding to the steady winding speed [SM] of the contact roller is as follows.

[0041] When the yarn is wound in the state of being over-fed, the formula for calculating the command contact roller frequency [OS (Hz)] is as follows when the over-feed rate is [F (%)]. Is the street.

[0042] Generally, it is sufficient to set the above-mentioned overfeed rate (%) to 0 or a constant value from the beginning to the end of winding, but in the case of improving the winding shape of the package, the winding diameter, Alternatively, it can be a function of the winding time.

In the manual winder shown in FIG. 1, when a preset amount of yarn is wound on the bobbin, the yarn is cut, and the full-wrapping package and the empty bobbin are replaced to perform the yarn hooking operation. To do.

Since the winding machine described above is continuously operated for a predetermined time by winding the yarn, the temperature of the bearing and the like rises and the slip changes.

Therefore, the slip of the pressure contact roller 5 is calculated in the same manner as the first thread hooking before the thread hooking operation is performed.

The above-described calculation of slippage is performed every time the threading operation is performed in the manual thread switching type winding machine, but it is also possible to calculate the slippage at a predetermined interval such as once skipping.

Next, calculation of slip in the turret type winder will be described.

Using a turret type winding machine in which a plurality of spindles are mounted on a turret member, the yarn is sequentially switched from a spindle having a fully wound bobbin to a spindle having an empty bobbin to wind the yarn. In addition to the first threading operation, the contact pressure roller 5 is not connected to the spindle 2 before the bobbin is wound with a preset amount of thread and the full bobbin is switched to the empty bobbin. In the contact state, the command frequency with respect to the yarn switching speed of the electric motor 6 for driving the contact roller and the number of pulses for detecting the contact roller rotation are detected to calculate the slip between the bearing of the contact roller 5 and the electric motor 6.

The slip in the turret type winder is
Threading speed [SI (m / mi
n)] is replaced with the thread switching speed [SH (m / min)],
The number of pulses (pulse / sec) corresponding to the yarn switching speed [SH] of the contact roller at the time of switching the command frequency (Hz) to the electric motor 6 is calculated, and then calculated by a slip calculation formula.

That is, the command frequency [RH1 (Hz)] ignoring slip is And the number of contact pressure roller feedback pulses is [RFH
P1 (pulse / sec)] is calculated as follows. If the number of contact pressure roll rotation detection pulses is [RFHP2 (pulses / sec)], the slip [η
The calculation formula for calculating [H] is as follows.

[0051] Substituting the RFHP1 of the calculation formula (14) into the RFHP1 of the calculation formula (15), the command frequency [RH1 (H
z)] and the number of contact pressure roll rotation detection pulses [RFHP2 (pulse / sec)], the slip [ηH] can be calculated, and the calculation formula is as follows.

[0052] The calculation of the slip in the above-mentioned turret type winding machine is performed at the time of the first thread hooking operation and each time of the thread switching operation, but it is also possible to calculate it at a predetermined interval such as one skip.

In the above embodiment, the slip is calculated by detecting the rotation speed of the contact roller as the pulse number, but the slip can be calculated by detecting the rotation speed as the rotation number by the tachometer generator.

As in the above-described embodiment, the electric motor 6 for driving the contact roller is controlled based on the command frequency value calculated by the calculation formula (1) or the calculation formula (13) ignoring the slip when calculating the slip. After the slip calculation, the control is performed based on the command frequency value corrected by the slip, so that the rotation speed of the contact pressure roller changes by the slip.

When it is desired to reduce the amount of change in the rotation speed of the contact roller, the threading speed (SI) in the calculation formula (1) is used.
Alternatively, the thread switching speed (SH) in the calculation formula (13)
Is set to the value obtained by adding the slip amount calculated last time.

The above-mentioned slip [ηF, ηH] is calculated by the command frequency of the electric motor 6 for driving the contact roller and the contact roller 5.
The number of rotation detection pulses of the contact pressure roller 5 or the number of rotation detection pulses of the contact pressure roller 5 and the number of pulses corresponding to the yarn hooking speed or the yarn switching speed of the contact pressure roller obtained by the calculation ignoring slippage. Replacing the formula for the number of pulses with the formula for calculating the number of revolutions or the frequency, the number of revolutions detected by the contact roller when the contact roller was rotated by an electric motor and the number of revolutions calculated by ignoring slippage,
Alternatively, it can be calculated from a command frequency value when the contact pressure roller is rotated by an electric motor and a frequency value obtained by calculation ignoring slip.

[0057]

The drive control method for the contact roller according to the present invention comprises:
Do not allow the contact pressure roller to come into contact with the bobbin tightened on the spindle during the thread hooking operation or the thread switching operation when the winding of the yarn is started by the spindle drive type winder having the electric motor for driving the contact pressure roller. It is rotated by an electric motor, a slip generated in the electric motor at this time is calculated, and a rotation command frequency for the electric motor is corrected based on the slip, so that a winding machine, an electric motor,
Even if the bearing is replaced, the winding of the yarn is started.The slip is automatically calculated and updated during the yarn hooking operation or the yarn switching operation, and the yarn is wound under the preset conditions. It is possible to obtain a package having a uniform winding shape. Further, it is possible to prevent heat generation and damage of the electric motor due to overload. Furthermore, it is possible to omit the measurement of the slip of the electric motor for driving the contact roller when the winding machine is assembled and the bearings are completely replaced.

Further, the slip generated in the electric motor for driving the contact pressure roller is obtained by a calculation ignoring the contact detection roller rotation detection pulse number or the detected rotation speed and slip when the electric motor is rotated at a predetermined rotation speed. To measure the slip, if it is calculated by the number of pulses or the number of revolutions obtained, or by the command frequency value when the motor is rotated at a predetermined number of revolutions and the frequency value obtained by the calculation ignoring the slip. Accurate slip can be obtained only with existing equipment without installing special equipment.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing one embodiment of the overall configuration of a spindle drive type winding machine for carrying out a drive control method for a contact roller according to the present invention.

[Explanation of symbols]

 1 Machine Frame 2 Spindles 3 and 6 Electric Motor 4 Traverse Head 5 Contact Pressure Roller 7 First Detector 8 Second Detector 9 Control Device

Claims (3)

[Claims] 1. A bobbin having a contact pressure roller fastened to a spindle during a yarn hooking operation or a thread switching operation in which winding of a yarn is started by a spindle drive type winder having an electric motor for driving a contact pressure roller. Driven by a motor in a state in which the pressure roller is not contacted with the motor, the slip generated in the motor at this time is calculated, and the rotation command frequency for the motor is corrected based on the slip. Control method. 2. The slip generated in the electric motor for driving the contact pressure roller is calculated by ignoring the slip of the contact pressure roller rotation detection pulse or the detected rotation speed when the electric motor is rotated at a predetermined rotation speed. The drive control method for the contact roller according to claim 1, wherein the calculation is performed by the number of pulses or the number of revolutions. 3. A slip generated in an electric motor for driving a contact pressure roller is calculated by a command frequency value when the electric motor is rotated at a predetermined rotation speed and a frequency value obtained by calculation ignoring the slip. The drive control method for the contact roller according to claim 1, wherein