JPH0571022A - Method for operating roving frame - Google Patents

Abstract

PURPOSE:To accurately and synchronously drive the motors of respective driving systems even when the change in the rotation rates of the motors on the starting of a roving frame, etc., by operating the roving frame by a specific method, the roving frame being constituted so that the spinning-driving system and the winding-driving system are driven with different speed-variable motors. CONSTITUTION:In the inputting device of a roving frame in which a spinning-driving system and a winding-driving system are driven with different rate-variable motors so that the driving speeds of the systems can independently be changed, spinning conditions are inputted into a memory and subsequently the operation of the roving frame is started. The rotation rate of a flier-driving system motor is detected with a detecting means, and subsequently on the basis of the detected rotation rate of the flier-driving system motor at each time elapsed from the operation starting time of the roving frame and also on the basis of the above-mentioned spinning conditions, the rotation rates of other motors are computed in correspondence to the rotation rate of the flier-driving system motor. The other motors are driven so as to give the computed rotation rates, and the flier-driving system motor is simultaneously controlled so that the command pattern for the rotation rate of the flier-driving system motor is a S-shaped pattern on the starting of the roving frame and is a reverse S-shaped pattern on the stopping of the roving frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a roving spinning machine in which at least a spinning drive system and a winding drive system are driven by different variable speed motors, and more specifically, the spinning drive system at the time of starting and stopping. The present invention also relates to a method for operating a roving frame that can reliably synchronize the winding drive system.

[0002]

2. Description of the Related Art Generally, in a roving machine, a roving fed from a front roller at a constant speed is twisted into a roving due to a difference in rotational speed between a flyer rotating at a constant speed and a bobbin rotating at a higher speed. It is wound on a bobbin while being applied. If winding is not performed so that the amount of roving delivered and the amount of roving are approximately the same during winding, normal winding will not be performed and yarn unevenness and roving breakage will occur due to fluctuations in the tension of the roving. .. Therefore, conventionally, a transmission using a pair of cone drums and a belt shifter controls the rotation speed of the bobbin so that the rotation speed of the bobbin gradually decreases as the roving layer wound on the bobbin increases. However, since the number of roving layers wound on the bobbin and the rate of increase in the bobbin diameter (coarse yarn winding diameter) change depending on the spinning conditions, the shape of the cone drum must be changed according to the spinning conditions. It is necessary to replace) or change the belt shifter by using an auxiliary cam capable of adjusting the movement amount of the belt shifter in accordance with the spinning conditions (Japanese Patent Publication No. 52-48652). Troublesome replacement or adjustment work was required.

In recent years, there is a strong demand for high-mix low-volume production, and in order to cope with frequent changes in spinning conditions, the spinning drive system and the winding drive system are driven by different variable speed motors, respectively. There has been proposed a roving machine in which each variable speed motor is drive-controlled based on the data previously input to the storage device in correspondence with the spinning conditions (for example, Japanese Patent Laid-Open No. Hei 3).
No. 40819). In the roving machine configured such that the spinning drive system and the winding drive system are driven by different variable speed motors, by inputting data corresponding to the spinning condition, the speed corresponding to the spinning condition is input. The drive motor is controlled so that the roving is wound from the beginning to the end of winding. Therefore, the spinning conditions can be changed more easily than in a roving machine equipped with a transmission using a cone drum, and it is easy to deal with frequent changes in the spinning conditions.

[0004]

However, in the case where the drive system of the roving frame is divided into a plurality of parts and each motor is driven by a separate motor, it is necessary to control each motor synchronously. When the drive system is divided into a plurality of parts, the load resistance and the load inertial force of the motor that drives the flyer drive system become larger than those of other motors. Therefore, when the speed change of the motor is large such as when the roving machine is started or stopped, if the speed command to each motor is linearly changed to the target predetermined speed, the load resistance and the load inertial force are A large flyer drive system motor is apt to cause a delay in start-up and overshoot. On the other hand, in other drive system motors with small load resistance and load inertial force, even if a similar speed command is issued, the start-up delay of the motor is smaller than that of the flyer drive system, and as a result, the flyer drive system motor and other drive system There is a problem that it becomes difficult to perform synchronous control with the motor for use. This problem becomes more noticeable when the roving frame is operated at high speed.

The present invention has been made in view of the above problems, and an object thereof is to provide a roving machine in which the spinning drive system and the winding drive system are driven by different variable speed motors, respectively. It is an object of the present invention to provide a method for operating a roving frame, which is capable of accurately synchronously controlling the motors of the respective drive systems in a state where the speed of the roving frame changes greatly such as when the roving frame is started or stopped.

[0006]

In order to achieve the above-mentioned object, in the present invention, at least the spinning drive system and the winding drive system are capable of changing gears independently of each other, so that each drive system has a different variable speed motor. And a spinning condition input device, a storage device that stores spinning conditions input by the input device, and a detection device that drives at least the rotation speed of a motor that drives the flyer drive system. In a roving machine equipped with a calculation means for calculating the speed of a variable speed motor, other motors are tracked and controlled based on the speed of the flyer drive system motor, and the speed command pattern at startup of the flyer drive system motor is set. The speed command pattern at the time of stop is controlled so as to have an S-shaped curve so as to have an inverted S-shaped curve.

[0007]

At least the rotational speed of the flyer drive system motor is detected by the detecting means. The computing means corresponds to the speed of the flyer drive system motor based on the spinning conditions input by the input device, with the speed of the flyer drive system motor at each elapsed time from the start of operation of the roving frame as a reference. The speed of each other variable speed motor is calculated. Then, each variable speed motor is drive-controlled so that the calculated speed is achieved. At startup, the speed command pattern for the flyer drive system motor is controlled to have an S-shaped curve, and at stop, the speed command pattern is controlled to have an inverted S-shaped curve. Therefore, even if there is a large change in speed until the target rotation speed is reached, a delay between the speed command and the rotation speed of the flyer drive system motor in the middle stage until the end of gear shifting is prevented. In addition, since other flywheel drive systems with small load inertial forces also have small flyer speed changes, more precise follow-up control to the flyer drive system can be performed. As a result, the variable speed motors are controlled to be synchronously driven with high accuracy.

[0008]

【Example】

(Embodiment 1) A first embodiment embodying the present invention will be described below with reference to FIGS.

First, a drive system of a roving machine for carrying out the method of the present invention will be described with reference to FIG. The drive system includes a spinning drive system, a winding drive system, and a lifting drive system, and each drive system is provided with a different variable speed motor. The spinning drive system is composed of a draft section 1 and a flyer section 2, and a rotary shaft 3 having a front roller 3 constituting the draft section 1
A gear train 5 is provided between one end of a and the driving shaft 4.
Also, a belt transmission mechanism 6 is provided. The driving shaft 4 is connected to a flyer motor M1 as a flyer drive system motor via a belt transmission mechanism 7. A drive gear 10 is fitted on a rotary shaft 9 to which the rotation of the driving shaft 4 is transmitted via a belt transmission mechanism 8, and a driven gear 12 meshing with the drive gear 10 is provided on an upper portion of a flyer 11 constituting the flyer portion 2. It is fitted and fixed so as to be integrally rotatable. A pulse encoder E1 is connected to one end of the rotary shaft 3a as a detecting means for indirectly detecting the rotational speed of the flyer motor M1.

A bobbin wheel 13 which constitutes a winding drive system.
Is mounted on the bobbin rail 14 and the bobbin wheel 13
The rotary shaft 16 to which the drive gear 15 that meshes with the driven gear 13a is fitted and fixed, and the rotary force of the driving shaft 4 and the rotary force of the winding motor M2 are combined with each other.
It is composed by 7 and transmitted. That is, the rotation of the winding motor M2 is input to the differential gear mechanism 17 via the belt transmission mechanism 18, and the differential gear mechanism 17
To the gear train 19 arranged on the output side of the universal joint 20
The rotary shaft 16 is connected via a connecting shaft 21. A pulse encoder E2 as a rotation speed detecting means is attached to the winding motor M2.

A rotary shaft 2 having a lifter rack 22 constituting a lifting drive system fixed to the bobbin rail 14 and a pinion 23 meshing with the lifter rack 22 fitted therein.
4, the rotation of the lifting motor M3 is transmitted via the belt transmission mechanism 25, the gear train 26, and the like. A switching mechanism 29 equipped with a pair of electromagnetic clutches 27, 28 is disposed in the middle of the gear train 26, and the electromagnetic clutches 27, 28 are excited and demagnetized to rotate the rotating shaft 24, that is, the bobbin rail 1.
The direction of the vertical movement of 4 can be changed. Rotating shaft 2
A pulse encoder E3 as a detecting means for indirectly detecting the rotation speed of the lifting motor M3 is connected to one end of 4. Both electromagnetic clutches 27 and 28 are not excited at the same time, and the bobbin rail 14 is moved upward when one electromagnetic clutch 27 is excited and moved downward when the other electromagnetic clutch 28 is excited. It has become. Each of the motors M1 to M3 is an independent inverter 31 to which is controlled based on a command from the control device 30.
It is adapted to be speed-changed via 33.

As shown in FIG. 4, a microcomputer 34 constituting the control device 30 is a program memory including a central processing unit (hereinafter referred to as CPU) 35 as an arithmetic means and a read-only memory (ROM) storing a control program. 36, and a work memory 38 as a storage device including a readable and rewritable memory (RAM) for temporarily storing the input data input by the input device 37, the calculation processing result in the CPU 35, and the like.
35 operates based on the program data stored in the program memory 36. The spinning memory such as the gelen, the fiber type, the number of twists, and the bobbin diameter at the start of winding is stored in the working memory 38.
The input device 37 for inputting to is integrated into the control device 30 as a keyboard. The work memory 38 stores data indicating the relationship between the number of revolutions of the flyer motor M1 at the time of starting and stopping the roving machine, and the winding motor M2 and the lifting motor M3 corresponding to the spinning conditions. ing.
The CPU 35 includes the pulse encoders E1, E2, E
The output signal from 3 is input.

The CPU 35 outputs a speed instruction to the flyer motor M1 to the inverter 31 via the output interface 39 and the flyer motor drive circuit 40 based on the spinning condition input by the input device 37. .. Further, the CPU 35 calculates the rotation speed of the flyer motor M1 based on the output signal from the pulse encoder E1, calculates the rotation speeds of the winding motor M2 and the lifting motor M3 corresponding to the rotation speed, and An output interface 39, a winding motor drive circuit 41, and a lifting motor drive circuit 42 that output a speed instruction corresponding to the speed
It is designed to be output to the inverters 32 and 33 via.

Next, the operation of the apparatus constructed as described above will be described. Prior to operating the machine base, first, gelen, fiber type,
The spinning conditions such as the number of twists and the bobbin diameter at the start of winding are input by the input device 37. When the machine base starts to operate, the flyer motor M1, the winding motor M2, and the lifting motor M3 are driven. The belt transmission mechanism 7, the driving shaft 4, the belt transmission mechanism 8, the rotating shaft 9, the drive gear 10, and the driven gear 12 are driven by the flyer motor M1.
The flyer 11 is rotatably driven via the belt drive mechanism 7, the driving shaft 4, the gear train 5, and the belt drive mechanism 6 to rotate the front roller 3 respectively. Further, the combined rotational force of the flyer motor M1 input to the differential gear mechanism 17 and the rotational force of the winding motor M2 is applied to the rotary shaft 16 via the gear train 19 and the connecting shaft 21. The bobbin wheel 13 to which the bobbin B is attached is rotated and driven via the drive gear 15 and the driven gear 13a. That is, the flyer motor M1 not only drives the draft section 1 and the flyer section 2, but also bears part of the driving force of the winding drive system. Further, the bobbin rail 14 is moved up and down together with the lifter rack 22 via the belt transmission mechanism 25, the gear train 26, the switching mechanism 29, the rotating shaft 24 and the pinion 23 by driving the lifting motor M3.

The inverter 3 is output from the CPU 35 via the output interface 39 and the flyer motor drive circuit 40.
The flyer motor M1 is driven according to the speed instruction signal output to No. 1. The speed instruction signal to the flyer motor M1 is output based on the spinning conditions input by the input device 37. The CPU 35 calculates the rotation speed of the flyer motor M1 based on the output signal from the pulse encoder E1, and uses the actual rotation speed of the flyer motor M1 as a reference, and the winding motor M2 and the lifting motor corresponding to the rotation speed. The rotation speed of M3 is calculated. Then, a speed instruction signal corresponding to the rotation speed is output to the inverters 32 and 33, and the winding motor M2 and the lifting motor M3 are driven. The rotation speeds of the motors M1, M2, M3 are detected by the pulse encoders E1, E2, E3 and fed back to the CPU 35.

At the time of start-up from the start of operation of the machine base until the flyer 11 reaches a predetermined steady winding rotation speed, the CPU
In 35, the speed instruction step ΔN to the inverter 31 for controlling the drive of the flyer motor M1 gradually increases from the initial start-up and reaches almost half of the target speed except for the first speed instruction step Ns as shown in FIG. The command signal is output so as to gradually decrease from the time point until the target speed (steady winding rotation speed) is reached, that is, the speed instruction pattern becomes an S-shaped curve. When the machine is stopped, the speed instruction step ΔN for the inverter 31 is shown in FIG.
As shown in, the speed instruction pattern is gradually increased from the initial stage of deceleration except for the final speed instruction step ND, and gradually decreased from the time when almost half of the target speed is reached until the target speed (rotational speed 0) is reached, that is, the speed instruction pattern. Outputs a command signal so that the curve becomes an inverted S curve.

During acceleration / deceleration of the motor, a load inertial force is further applied to the load torque. Therefore, when the speed change of the motor is large such as when the roving machine is started or stopped, if the speed command to the motor is linearly changed to a target predetermined speed in a short time, the flyer motor M
As shown in FIG. 2, a motor having a large load torque (load resistance) and a large load inertial force acting as shown in FIG. 1 causes a large delay in the actual rotation speed of the motor with respect to the speed instruction of the motor and causes an overshoot. It tends to occur. However, the acceleration torque of the motor is minimized by reducing the speed instruction step ΔN at the initial stage of start-up, the initial stage of deceleration, or near the target speed where the influence of the load inertial force greatly affects, and the motor acts like the flyer motor M1. Even when the load torque (load resistance) and the load inertial force are large, the delay of the actual rotation speed of the motor with respect to the speed instruction becomes very small, and the occurrence of overshoot is prevented. Further, the inverter 31 is prevented from being over-currented or over-voltageed, so that the trip can be prevented.

Further, the winding motor M2 and the lifting motor M
Since the load torque and the load inertial force acting on 3 are much smaller than those of the flyer motor M1, the delay of the actual rotation speed of the motor with respect to the speed instruction is small. And
The speed instructions for the winding motor M2 and the lifting motor M3 are set on the basis of the actual rotation speed of the flyer motor M1. Further, since the speed change of the flyer motor M1 is small, the motors M1, M2, M3. Is controlled synchronously with high precision.

Further, as a characteristic of the inverter, there is a dead zone (below the minimum frequency) where the variable speed motor cannot be controlled in the low frequency range. However, in this embodiment, the first speed instruction Ns at the start of starting and the final speed instruction ND at the stop
Is set to be higher than the minimum frequency (for example, 6 Hz), it is possible to reliably drive and control the motors M1, M2, and M3 in accordance with the speed instruction signal.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the draft part 1 and the flyer part 2 of the spinning drive system are separated, and a draft motor M4 for driving the draft part 1 and an inverter 43 for the draft motor M4 are provided. It differs from the example. The rotation of the draft motor M4 is transmitted to the rotary shaft 3a via the belt transmission mechanism 6, and the rotary shaft 3a is connected to a pulse encoder E4 for detecting the rotational speed of the draft motor M4. A pulse encoder E1 for detecting the rotation speed of the flyer motor M1 is connected to the driving shaft 4. The draft motor M4 is driven according to the speed instruction signal output from the CPU 35 to the inverter 43 via the output interface 39 and the draft motor drive circuit 44.

In this embodiment, since the flyer motor M1 does not need to drive the draft section 1, the load torque and the load inertial force acting on the flyer motor M1 are smaller than those in the above embodiments, and a predetermined speed at the time of starting. It is possible to shorten the time required to reach (1) or the time from the start of deceleration to the completion of stop at the time of stop. Further, even when the flyer is operated to change gears in response to the large package and the speeding up of the machine base, the synchronous drive control of the motors M1, M2 and M3 can be performed accurately.

The present invention is not limited to the above embodiment, and for example, the rotary shaft 16 is directly driven only by the winding motor M2 without providing the differential gear mechanism 17, or the lifting motor M3 is used. Alternatively, the switching mechanism 29 may be omitted by using a motor that can be driven to rotate in the forward and reverse directions. In addition, each motor M1, M
Other variable speed motors such as servo motors may be used instead of using motors that are variable-speed driven via inverters as 2, M3 and M4.

[0023]

As described above in detail, according to the present invention, the delay between the speed command to the flyer drive system motor having the largest load resistance and load inertia and the actual rotation speed is prevented, and other motors are prevented. Is driven and controlled so as to follow the rotation speed of the flyer drive system motor, and since the speed change of the flyer drive system motor is small, the synchronization accuracy of each motor is improved.

[Brief description of drawings]

FIG. 1 is a time chart showing a speed command in a first embodiment.

FIG. 2 is a diagram showing a deviation between a speed command and an actual motor rotation speed when the speed command at the time of start and at the time of stop is linear.

FIG. 3 is a schematic perspective view of a drive mechanism of the roving machine of the first embodiment.

FIG. 4 is a block diagram of a control device.

FIG. 5 is a schematic perspective view of a drive mechanism of a roving machine according to a second embodiment.

FIG. 6 is a block diagram of the control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Draft part which comprises a spinning drive system, 2 ... Similarly flyer part, 3 ... Front roller, 11 ... Flyer, 35 ...
CPU as calculation means, 37 ... Input device, 38 ... Program memory as storage device, E1, E2, E3 ... Pulse encoder as rotation speed detection means, M1 ... Flyer motor as flyer drive system motor, M2 ...
Winding motor, M3 ... Lifting motor.

Claims (1)

[Claims] 1. A drive system for driving at least a flyer drive system, wherein at least a spinning drive system and a take-up drive system are independently variable in speed so that each drive system is driven by a different variable speed motor. Rough spinning machine provided with a detecting means for detecting the speed, a spinning condition input device, a storage device for storing the spinning condition inputted by the input device, and a computing means for computing the speed of each of the variable speed motors. In the above, other motors are controlled to follow the speed of the flyer drive system motor as a reference, and the speed command pattern at the time of stop is reversed so that the speed command pattern at startup of the flyer drive system motor becomes an S-shaped curve. A method for operating a roving machine which controls so as to form an S-shaped curve.