JP3591441B2 - Spindle speed change control method and spindle speed change control device for spinning machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spindle speed change control method and a spindle speed change control device for a spinning machine such as a ring spinning machine or a ring twisting machine equipped with a large number of weights and provided with a yarn breakage detecting means for each weight.
[0002]
[Prior art]
In a spinning machine such as a ring spinning machine or a ring twisting machine, one machine is equipped with several hundred to one thousand spindles. Then, when a yarn break occurs, it is necessary to notify the occurrence and perform a piecing operation by a worker or a piecing device. For example, Japanese Utility Model Laid-Open No. 3-45980 discloses a photoelectric tube sensor for detecting a yarn break for each spindle of a spinning machine, and one of the sensors is provided on a control panel provided at one end of the spinning machine. There is disclosed a yarn breakage detecting device provided with a yarn breakage notifying means for notifying a yarn breakage via a relay when detecting. Japanese Patent Application Laid-Open No. 11-181636 discloses that in a single-spindle drive type spinning machine in which a motor is provided for each spindle of each spindle, the amount of current supplied to the spindle of each spindle is measured, and based on the measured data, There is disclosed a yarn breakage detection method for a spinning machine in which a main controller of a machine frame determines whether or not each spindle has a yarn breakage.
[0003]
Conventionally, there is a device that detects a yarn break and notifies the operator of the occurrence of a yarn break.However, the operating conditions of the machine base are not changed according to the yarn break condition, and how to efficiently perform the yarn splicing operation is performed. It was thought to do.
[0004]
[Problems to be solved by the invention]
Even if the piecing operation is performed efficiently, if the thread breaks frequently during the period from the start of operation to the stoppage of the full pipe, the operation speed of the machine is slowed down and the spinning speed is reduced in consideration of the man-hour and time required for the piecing operation As a result, the productivity of the entire machine may deteriorate and the production cost may increase.
[0005]
Further, when thread breaks are concentrated on a specific weight, there is a problem such as poor centering of the weight, and if the problem is repaired, the yarn breakage is reduced. However, when thread breakage occurs frequently without a specific cause on the weight side, spinning conditions may not be appropriate. Even if the machine base is repeatedly operated under such spinning conditions, the state of occurrence of yarn breakage is not improved.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the productivity by reducing the occurrence of thread breakage in the entire machine stand with a simple operation when thread breakage occurs frequently. It is an object of the present invention to provide a spinning speed control method and a spindle speed control device for a spinning machine.
[0007]
[Means for Solving the Problems]
The inventors of the present invention arrived at the present invention in view of the fact that when the spindle rotation speed increases, thread breakage easily occurs even under other conditions.
[0008]
In order to achieve the above object, the invention according to claim 1 is provided with a plurality of weights , a spindle drive motor for driving a spindle of each weight , and a machine control device for controlling the number of revolutions of the spindle drive motor. In addition, in a spinning machine provided with a thread breakage detecting means for each spindle, the number of thread breaks of each spindle from the start of operation of the machine frame to the stop of full load is integrated, and the integrated value of the predetermined number of doff operations is preset. when it exceeds the allowable value, the frame control device by shifting controls the spindle drive motor so that lowering the preset min spindle rotational speed during the next operation. The predetermined number of doff operations may be one or more. “Doff operation” means an operation unit from the start of operation of the machine to the stoppage of full load.
[0009]
According to the present invention, the number of thread breaks for each spindle from the start of operation of the machine to the stop of full filling is integrated, and when the integrated value of the predetermined number of doff operations exceeds an allowable value, the spindle rotation speed is set in advance in the next operation. It is lowered by the amount. Therefore, during the next operation, the winding tension of the yarn becomes weak, and the occurrence of yarn breakage is prevented. As a result, the yarn break stop time is shortened, the productivity is improved, and the burden on the piecing operator is reduced.
[0010]
In the invention described in claim 2, in the invention described in claim 1, the number of times of thread breakage is integrated for each section in which the spindle drive control from the start of the operation of the machine to the stop of the full tube is different, and at least the integrated value is set in advance. In the section exceeding the set allowable value, the operation is performed by lowering the spindle rotation speed by the preset amount in the next operation. The “section where the spindle drive control is different” refers to a section where the spindle rotational speed or acceleration is different, that is, a section in a different constant speed state or a section where the acceleration state is different.
[0011]
According to the present invention, the number of times of thread breakage is integrated for each section in which the spindle drive control is different, and at least in a section where the integrated value exceeds a preset allowable value, the spindle rotational speed is reduced by the preset amount in the next operation. Therefore, when yarn breakage occurs frequently in the section before reaching the maximum operation speed, there is no need to lower the maximum operation speed, and the productivity is further improved.
[0012]
In the invention according to claim 3, in the invention according to claim 1 or 2, in the comparison between the integrated value and the permissible value, when the number of thread breaks of the specific weight is larger than a preset value, A value obtained by removing the number of times from the integrated value is compared with the allowable value. Therefore, according to the present invention, it is possible to appropriately reflect the result of the weight whose spindle rotation speed is related to the yarn breakage.
[0013]
According to the invention described in claim 4, in the invention described in claim 3, the spinning machine is a single-spindle-driven spinning machine that independently drives a spindle of each spindle by a motor provided for each spindle. The weight whose number of thread breaks is larger than the preset number stops driving at the next operation. According to the present invention, the driving of the non-adjustable weight is stopped at the next operation, so that useless piecing work is eliminated.
[0014]
According to the fifth aspect of the present invention, in a spinning machine equipped with a large number of weights and having a thread breakage detecting means for each weight, a spindle driving motor provided for each weight and the number of times of thread breakage of each weight are determined. Measuring means capable of measuring the spindle drive control for each of different sections; determining means for determining whether or not the integrated value of the number of thread breaks for each of the sections exceeds a preset allowable value; and A control means is provided for controlling a spindle driving motor so as to reduce the spindle rotation speed by a preset amount during the next operation in a section exceeding the allowable value.
[0015]
Therefore, in the present invention, the thread break for each weight is detected by the thread break detecting means provided for each weight, and the number of thread breaks for each weight is measured by the measuring means for each section where the spindle drive control is different. You. If the integrated value of the predetermined number of doff operations in each section exceeds the allowable value, the spindle rotation speed in the section is reduced by a preset amount in the next operation. Therefore, at the next operation, the winding tension of the yarn in the section becomes weak, and the occurrence of yarn breakage is prevented. As a result, an effect similar to that of the second aspect is obtained.
According to the invention described in claim 6, in a spinning machine equipped with a large number of weights and having a yarn breakage detecting means for each weight, the number of yarn breakages of each weight from the start of operation of the machine stand to the stoppage of full load is integrated. When the integrated value of the number of times of the predetermined doff operation exceeds a preset allowable value, the spindle rotation speed is reduced by a predetermined amount during the next operation, and the operation is performed. The spindle drive control up to the stop of the pipe is integrated for each different section, and at least in the section where the integrated value exceeds a preset allowable value, the spindle rotation speed is reduced by the preset amount during the next operation, and the operation is performed.
In the invention according to claim 7, in the invention according to claim 6, in the comparison between the integrated value and the allowable value, when the number of thread breaks of the specific weight is larger than a preset value, the number is set to the number of times. The value removed from the integrated value is compared with the allowable value.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a ring spinning machine driven by a single spindle will be described with reference to FIGS.
[0017]
As shown in FIG. 2A, each spindle 1 of the spinning machine is provided with a spindle driving motor (hereinafter referred to as a spindle motor) 2. As the spindle motor 2, a synchronous motor is used. Each spindle motor 2 includes a spindle control device 4 (shown in FIGS. 2B and 3) in a housing 3. The spindle controller 4 is supplied with a direct current converted from a commercial power supply by an AC / DC converter (both not shown).
[0018]
As shown in FIG. 2B, the spindle control device 4 includes an inverter 5 and a control unit 6. The control unit 6 includes a CPU 7 and a memory 8. A current sensor 9 for measuring a current supplied to each spindle motor 2 is provided on an arbitrary one of the three power supply lines connecting the inverter 5 and the spindle motor 2. The CPU 7 inputs the output of the current sensor 9 via an A / D converter and an interface (neither is shown). The CPU 7 stops the power supply of the spindle to the spindle motor 2 when the thread breaks. The CPU 7 confirms (detects) a thread break by a signal from a machine control device described later.
[0019]
The housing 3 is provided with a display section 10 for displaying a thread break. An LED (light emitting diode) is used for the display unit 10, and the display unit 10 is provided on the front surface of the housing 3 as shown in FIG. The housing 3 is provided with a switch 11 for instructing start and stop of the spindle motor 2.
[0020]
The entire weight of the spinning machine stand is divided into a plurality of groups, and as shown in FIG. 3, each control unit 6 divides the plurality of weights (for example, 48 weights) into one group and communicates with the section control unit 12 via the communication line 13. Connected. Each section control unit 12 is connected via a communication line 13 to a machine control device 14 that controls the entire weight. The communication line 13 employs a multi-drop connection using a serial interface. For example, RS-485 is used as a serial interface. Each section control unit 12 relays transmission and reception of signals between the control units 6 of the group connected to the section control unit 12 and the machine control device 14. The output of the current sensor 9 provided for each weight is input to each control unit 6 at a predetermined time based on a command from the machine control device 14, and the measured data is digitally transmitted via each section control unit 12. Is transmitted to the machine control device 14 as the current value data.
[0021]
The machine control device 14 includes a CPU 15, a ROM 16, a RAM 17, an input device 18, and an input / output interface 19. The CPU 15 is connected to a winding amount detecting means 20 via an input / output interface 19. A counter for integrating the number of rotations of a front roller (not shown) is used as the winding amount detection means 20, and the CPU 15 calculates the winding amount at that time from the count value.
[0022]
The ROM 16 stores program data and various data necessary for its execution. The program data includes various fiber raw materials, spun yarn counts, number of twists, and other spinning conditions, spindle rotation speed during operation, rotation speeds of the draft drive system and lifting drive system motor rotation data, and various other data. There are maps and the like showing the relationship between the number of rotations and the amount of supply current in the winding amount. This map varies depending on the spinning conditions, and is determined in advance by a spinning test or theoretically. The RAM 17 temporarily stores data input by the input device 18, results of arithmetic processing in the CPU 15, and the like.
[0023]
The CPU 15 inputs the measurement data of the current sensor 9 of each weight via each control unit 6 and each section control unit 12, and performs a predetermined operation in the same manner as the yarn breakage detection device disclosed in Japanese Patent Application Laid-Open No. 11-181636. The presence or absence of thread breakage of each weight is determined every time. Then, the CPU 15 outputs a thread break notification signal via the section control unit 12 to the weight determined to be broken. The current sensor 9 and the CPU 15 constitute a yarn break detecting means.
[0024]
The rotation speed of the spindle is set in advance for each spinning condition so as to change in accordance with the spinning amount (winding amount). ) Is divided into a plurality of sections (9 sections in this embodiment), and the spindle drive control is performed in a different state for each section. For example, as shown by a solid line in FIG. 1, the speed is gradually increased after a sudden acceleration is performed at the time of starting, and after a sudden deceleration is performed near a full load, the vehicle is stopped.
[0025]
The CPU 15 accumulates the number of thread breaks of each spindle from the start of the operation of the machine to the stop of full filling (for one doff) for each section in which the spindle drive control is different. The RAM 17 is provided with a storage area for storing the number of thread breaks corresponding to each section for each weight. When a thread break occurs, the CPU 15 accumulates and stores the number of thread breaks in the corresponding area, and stores a ball associated with a full tube. Reset the integrated value of each area to zero when the machine is restarted after stopping frying.
[0026]
The CPU 15 determines whether or not the total value of the integrated values of all the weights in each section has exceeded a preset allowable value Np at the time of the full stop. Then, for at least the section in which the total value exceeds the allowable value Np, a speed command is output to each control unit 6 so as to reduce the spindle rotation speed by a preset amount at the next operation. As the decrease amount of the spindle rotational speed, for example, the rotational speed in a section where the total value exceeds the allowable value Np is set as a predetermined ratio of the previous rotational speed. By lowering the maximum rotation speed in the section, the rotation speed in at least the first half is also reduced in a section in which the total value does not exceed the allowable value Np. The CPUs 7 and 15 constitute control means for controlling the spindle driving motor such that the spindle rotation speed is reduced by a preset amount during the next operation in a section where the integrated value exceeds the allowable value Np.
[0027]
The CPU 15 determines whether or not the accumulated number of yarn breaks is greater than a preset value for each weight, and if so, determines that the weight is an irregular weight. Then, the weight is removed to obtain the integrated value, which is compared with the allowable value Np. Further, the CPU 15 outputs a drive prohibition command signal to the control unit 6 of the weight before starting the next operation. The control unit 6, which has received the drive prohibition command signal, does not start the spindle motor 2 until the drive prohibition release command is input, even if the spindle drive command signal is input from the switch 11 or the machine controller 14. ing.
[0028]
Next, the operation of the device configured as described above will be described. Prior to the operation of the spinning machine, spinning conditions such as the fiber raw material, the spun yarn count, and the number of twists are input to the machine controller 14 by the input device 18. Then, when the operation of the spinning machine is started, the control unit 6 of each spindle controls the spindle motor 2 via the inverter 5 at a predetermined rotation speed in accordance with the spinning conditions based on a command from the machine control device 14. Is controlled so that
[0029]
The CPU 15 of the machine base control device 14 inputs the measured current value data of the current sensor 9 of each weight via the control unit 6 and the section control unit 12 at predetermined time intervals, and based on the value, detects the yarn breakage of each weight. Determine the presence or absence. The CPU 15 outputs a thread break signal to the control unit 6 of the weight that has determined that the thread has broken, and also determines which section of 1 doff from the output signal of the winding amount detecting means 20 and counts the number of thread break count accumulation areas in the section. Add 1 to the value. Hereinafter, every time a thread break occurs, 1 is added to the count value of the thread break count accumulation area in the corresponding section. Further, the number of thread breaks is integrated for each weight.
[0030]
When the operation of the machine is stopped due to the full load, the CPU 15 compares the integrated value of the number of thread breaks in each section with the allowable value Np. In the comparison between each integrated value and the allowable value Np, when the number of times of thread breakage of the specific weight is larger than a preset value, the value obtained by removing the number of times from the integrated value is compared with the allowable value Np. When the integrated value N exceeds the allowable value Np, the CPU 15 changes the command value of the spindle rotation speed in the next section and the next section in the next operation according to a preset method. Then, during the operation after the restart of the machine, the CPU 15 outputs the changed spindle rotation speed command value to each control unit 6.
[0031]
For example, when the drive control of the spindle 1 is performed at the speed change indicated by the solid line in FIG. 1, when the integrated value N exceeds the allowable value Np in the fourth section, as shown by the chain line in FIG. , The setting of the spindle speed in the fourth section and the fifth section is changed. The maximum speed of the fourth section is reduced at a predetermined rate, and the maximum speed of the fifth section is not changed, but is changed at a fixed rate from the maximum speed of the fourth section to the maximum speed of the fifth section.
[0032]
In addition, a drive prohibition command signal is output for a weight whose number of thread breaks is greater than a preset value, and the spindle motor 2 of the weight is not driven during the next operation. The maintenance work is performed on the weight by a maintenance worker, and after the repair, a drive prohibition cancel command signal is input from the machine control device 14 before the machine is restarted after the machine is full.
[0033]
This embodiment has the following effects.
(1) The number of thread breaks of each spindle from the start of operation of the machine stand to the stop of full filling is integrated, and the integrated value of the predetermined number of doff operations (1 doff in this embodiment) exceeds a preset allowable value. At the time of the next operation, the operation is performed by lowering the spindle rotational speed by a preset amount. Therefore, in the next operation, the spindle rotation speed at the same spinning amount (winding amount) becomes low, the yarn breakage hardly occurs, and the productivity can be improved.
[0034]
(2) The number of times of thread breakage is integrated for each section in which the spindle drive control from the start of operation of the machine to the stop of full filling is different, and at least for the section in which the integrated value exceeds a preset allowable value Np at the next operation. The operation is performed by lowering the spindle rotation speed by a preset amount. Therefore, if thread breakage occurs frequently in the section before reaching the maximum operation speed, there is no need to lower the maximum operation speed, compared to a case where the spindle rotation speed is reduced overall over the entire section. Productivity is improved.
[0035]
(3) In the comparison between the integrated value and the allowable value Np, when the number of times of thread breakage of the specific weight is larger than a preset value, the value obtained by removing the number of times from the integrated value is compared with the allowable value Np. Therefore, it is possible to appropriately reflect the result of the weight whose spindle rotation speed is related to the yarn breakage.
[0036]
(4) The spindle motor 2 is provided for each weight, and a weight whose number of thread breaks is larger than a predetermined value is regarded as an irregular weight and its starting is prohibited, so that unnecessary splicing work of the irregular weight can be eliminated.
[0037]
(5) Since each spindle control device 4 is provided with the inverter 5, the spindle motor 2 of each weight can be accurately controlled.
The embodiment is not limited to the above, and may be embodied as follows, for example.
[0038]
○ Instead of accumulating the number of thread breaks for each section and comparing with the predetermined allowable value Np for each section, the number of thread breaks for one doff is integrated and compared with the allowable value. Alternatively, the spindle rotation speed may be reduced on average over the entire section in the next operation.
[0039]
○ The integration period of the number of thread breaks for determining whether to lower the spindle rotation speed next time is not one doff, but multiple doff operations, and the total or average of the number of thread breaks during that period is compared with the allowable value. You may.
[0040]
When decreasing the spindle rotational speed, the maximum rotational speed of the section after the decrease may be set. When the spindle rotation speed is reduced, instead of increasing at a constant acceleration from the point of the maximum rotation speed of the section after the decrease to the point of the maximum speed of the next section, as shown in FIG. The speed may be increased to the middle of the next section at the same acceleration.
[0041]
A lower limit value for the number of thread breaks may be provided, and when the number of thread breaks falls below the lower limit, the rotation speed of the spindle may be increased during the next operation. It is preferable that the increasing rate of the rotation speed is set smaller than the decreasing rate. In this case, even if a measure to lower the spindle rotation speed is taken once, it is possible to return to the original operation mode again. Further, the optimum spindle shift pattern can be automatically determined without setting the optimum shift pattern in advance.
[0042]
○ Each machine control device 14 is connected to a host computer, and the host computer determines the spindle rotation speed at the time of each machine operation next time based on the thread breakage data in each machine control device 14. May be instructed. In this case, there is no need to store data for setting the amount of decrease in the rotation speed of the spindle corresponding to each spinning condition for each machine control device 14.
[0043]
The number of sections is not limited to nine, and may be eight or less or ten or more depending on spinning conditions such as the maximum rotation speed of the spindle 1 and spinning speed. Also, in a section other than the maximum rotation speed, a section in which the rotation speed is constant may be provided.
[0044]
○ Each machine control device 14 is connected to a host computer, the data relating to thread breakage is output from the machine control device 14 to the host computer, and a drive prohibition command and a drive prohibition cancel command can be output from the host computer to each control section 6. May be configured.
[0045]
When a thread breakage occurs frequently in a specific weight, it is not necessary to output a drive prohibition command to the weight. Further, the number of thread breaks may be integrated without removing the multiple thread break weights.
The invention is not limited to a single spindle drive type ring spinning machine equipped with a spindle motor 2 for each spindle, but may be embodied as a belt drive type ring spinning machine in which a plurality of spindles are driven by one belt.
[0046]
The control unit 6 may determine whether or not each weight has a thread break based on the detection signal of the current sensor 9. Further, the detection of the thread breakage is not limited to the method in which the current supplied to the spindle motor 2 is detected by the current sensor 9, and another type of thread breakage detection sensor may be used.
[0047]
○ Instead of providing the inverter 5 for each weight, one inverter is provided for each group to drive and control the spindle motors 2 for each group, or the spindle motors 2 for all weights are driven via one inverter. It may be configured to control. In this case, the number of inverters is reduced, and the manufacturing cost is reduced.
[0048]
The present invention is not limited to the ring spinning machine, but may be applied to a single-spindle drive type ring twisting machine or the like.
The technical ideas (inventions) other than those described in the claims that can be grasped from the above embodiments are described below.
[0049]
(1) The transmission control device according to claim 5, wherein the shift control device determines whether an integrated value of the number of thread breaks in each section is smaller than a preset lower limit value, and the integrated value. A control means for increasing the spindle rotational speed of the section by a predetermined amount at the time of the next operation when is less than the lower limit value.
[0050]
【The invention's effect】
As described in detail above, according to the first to seventh aspects of the present invention, when thread breakage occurs frequently, the occurrence of thread breakage in the entire machine stand is reduced by a simple operation to improve productivity. be able to.
[Brief description of the drawings]
FIG. 1 is a graph showing a relationship between a spindle rotation speed and a spinning amount.
FIG. 2A is a schematic front view showing a weight according to an embodiment, and FIG. 2B is a block diagram of a spindle control device.
FIG. 3 is a block circuit diagram showing an electrical configuration.
FIG. 4 is a graph showing a method of setting a rotation speed according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Spindle, 2 ... Spindle motor, 7 ... CPU constituting control means, 9 ... Current sensor constituting thread breakage detection means, 15 ... Structure comprising thread breakage detection means and control means, and also as measurement means and judgment means CPU.

Claims (7)

Equipped with a large number of weights and a spindle drive motor for driving the spindle of each weight and a machine control device for controlling the rotation speed of the spindle drive motor,
Further, in a spinning machine provided with a yarn break detecting means for each weight ,
When the number of thread breaks of each spindle from the start of operation of the machine stand to the stop of full filling is integrated, and when the integrated value of the number of predetermined doff operations exceeds a preset allowable value,
Spindle speed change control method for a spinning machine for shift control of the spindle drive motor so that lowering the partial spindle rotational speed set in advance at the next operation by the frame control device. The number of times of thread breakage is integrated for each section in which the spindle drive control from the start of the operation of the machine to the stop of the full pipe is different, and at least a section in which the integrated value exceeds a preset allowable value is set in advance at the next operation. 2. The method according to claim 1, wherein the operation is performed by lowering the spindle rotation speed by a minute. In the comparison between the integrated value and the allowable value, when the number of times of thread breakage of the specific weight is larger than a preset value, a value obtained by removing the number of times from the integrated value is compared with the allowable value. The method according to claim 2, wherein the spindle speed is controlled. The spinning machine is a single-spindle drive type spinning machine that independently drives a spindle of each spindle by a motor provided for each spindle, and a spindle in which the number of times of thread breakage is larger than a preset number is used in the next operation. The method according to claim 3, wherein the driving is stopped. In a spinning machine equipped with a large number of weights and having a yarn breakage detecting means for each weight,
A spindle drive motor provided for each weight,
Measuring means capable of measuring the number of thread breaks of each weight for each section where the spindle drive control is different,
Determining means for determining whether or not the integrated value of the number of yarn breaks for each section has exceeded a preset allowable value;
A spindle speed control device for a spinning machine, comprising: control means for controlling a spindle driving motor so as to reduce the spindle rotation speed by a preset amount at the next operation at least in a section where the integrated value exceeds the allowable value.   In a spinning machine equipped with a large number of weights and having a yarn breakage detecting means for each weight,
  The number of thread breaks of each spindle from the start of operation of the machine stand to the stop of full filling is integrated, and when the integrated value of the predetermined number of doff operations exceeds a preset allowable value, the spindle rotation is set in advance for the next operation. Drive at reduced speed,
  The number of times of thread breakage is integrated for each section in which the spindle drive control from the start of the operation of the machine to the stop of the full pipe is different, and at least a section in which the integrated value exceeds a preset allowable value is set in advance at the next operation. Spindle speed change control method for a spinning machine that operates at a reduced spindle speed.   In the comparison between the integrated value and the permissible value, when the number of times of thread breakage of the specific weight is larger than a preset value, the value obtained by removing the number of times from the integrated value is compared with the permissible value. A method for controlling a spindle shift of a spinning machine according to the above.

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