JPH08284029A - Control of operation in temporary stop of spinning machinery and operation controller - Google Patents

Abstract

PURPOSE: To stop a ring rail at a position for facilitating the traveler exchange and prevent the yarn breakage from occurring in restarting. CONSTITUTION: A ring rail is decelerated together with a spindle from a deceleration starting position DS computed from a spindle rotational frequency Vs when pushing a stop switch and stopped at the top dead point in the final chase region. In this stopped state, a wide space (interval) for facilitating the traveler exchange operation is formed between the inner wall surface of the ring and the side of a cop. When a starting switch is pushed, the spindle is initially accelerated at a relatively small acceleration α1 in a rising region. When the spindle attains a prescribed rotational frequency V1 at which the traveler rotation is stabilized, the acceleration is changed over to a relatively large acceleration α2 and accelerated to the steady state speed Vmax.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning machine such as a ring spinning machine, which temporarily controls a stop position of a ring rail when temporarily stopping it for, for example, exchanging a traveler, and temporarily stops the spinning machine for speed control when restarting the ring rail. The present invention relates to an operation control method and an operation control device at the time.

[0002]

2. Description of the Related Art Generally, in a spinning machine, an emergency stop switch used in an emergency such as when trouble occurs and a temporary stop switch (used in an emergency such as maintenance work or a traveler exchange) (Hereinafter, simply called a stop switch)
And two types of stop switches are provided.

For example, a machine frame temporarily stopped by operating a stop switch for traveler exchange or maintenance work is restarted after the work is completed. When the bobbin is restarted, the tension of the thread starts the rotation of the bobbin to start the rotation of the traveler, and the resistance of the traveler causes a relatively large load (tension) to be applied to the thread at the time of rising. In recent years, the speed of spinning machines has increased, and along with this, the spindle acceleration has also been set to a large value, and as the spindle acceleration increases, thread breakage tends to occur at the time of rising.

The load applied to the yarn at the time of restart is influenced by the position of the ring rail at the time of starting, and becomes larger on the side near the top dead center where the gap between the inner wall surface of the ring and the side face of the tube yarn becomes wider. Therefore, for the purpose of reducing the load on the yarn at the time of restart, as shown in FIG. 5, 20 to 30 mm from the top dead center.
In some cases, the ring rail 41 is stopped at a position lowered by a predetermined distance L1 (hereinafter referred to as an appropriate position).

The ring rail 41 is near the top dead center and the ring 4
As the gap between the yarn 2 and the yarn K becomes wider, the direction of the force acting on the traveler 43 (the direction of the yarn tension) becomes a larger angle with respect to the movable direction of the traveler 43. A force component (a component orthogonal to the center of the ring 42) other than the movable direction becomes large. Therefore,
By stopping the ring rail 41 at a proper position lower than the top dead center by a predetermined distance L1 as shown in, the gap ΔG2 between the ring 42 and the yarn K is reduced, and the load applied to the yarn y at the time of restart is reduced. I was trying to get smaller.

To stop the ring rail 41 at an appropriate position, the spindle rotation speed is temporarily reduced to a predetermined rotation speed Vo based on a push switch depression signal and then held at a constant speed, and the ring rail 41 is moved to an appropriate position in advance. When it reaches the deceleration start position where it can be stopped, deceleration is restarted at a predetermined deceleration. When the ring rail reaches the proper position (the speed at this time is almost "0"), braking is applied to stop the ring rail at the proper position.

[0007]

However, when the traveler is temporarily stopped for exchanging the traveler, when the ring rail is stopped at an appropriate position, the gap between the ring and the yarn is narrow and it is difficult to exchange the traveler. That is, when the traveler is removed, the bamboo skewer-shaped replacement jig is inserted into the traveler and the hand is returned once. Therefore, there is a possibility that the returned hand may hit the yarn and damage the yarn. Also, when installing a new traveler, the procedure was to first insert the traveler from the inside of the ring, which made work difficult if the gap was narrow.

Therefore, there is a case where the traveler is replaced by forcibly lifting the ring rail from an appropriate position to a position where the traveler can be easily replaced. At this time, if the ring rail is not returned to the proper position and is restarted as it is, thread breakage is caused and extra thread joining work is inevitable.

Normally, in a spinning machine or the like, the acceleration at the start-up after a temporary stop is set to a large start-up in order to quickly reach the target speed. Further, regarding speed control of the break-in operation after the traveler is exchanged, for example, JP-A-60-155728 and JP-A-5-106122.
Although the publication is disclosed, the rising acceleration during a break-in operation is also shown as a large rising.

The present invention has been made in view of the above problems, and an object thereof is to stop a ring rail at a position where it is easy to change a traveler at the time of a temporary stop, and even for a spinning machine operated at a high speed. An object of the present invention is to provide an operation control method and an operation control device when a spinning machine is temporarily stopped so that yarn breakage does not occur at the time of restart.

[0011]

In order to solve the above-mentioned problems, in the invention described in claim 1, the ring rail is moved substantially above or below the top dead center in the ascending / descending region when the spinning operation is temporarily stopped. A low acceleration region was set in which the acceleration at the start-up of the spindle was set to be relatively small so that a load equal to or higher than the breaking strength would not be applied to the yarn when it was restarted.

According to a second aspect of the present invention, in the spinning machine driven by the drive control means at a constant ratio of the ring rail ascending / descending speed and the spindle rotation speed, a stop switch for temporarily stopping the spinning operation, and Ring rail position control means for stopping the ring rail at or near the top dead center within the ascending / descending region based on the signal that the stop switch is operated, and a start for restarting the spinning machine that is temporarily stopped. A switch, and a spindle drive means for driving the spindle based on a signal from which the start switch is operated, and for setting the acceleration of the rising process to a relatively small value so that the yarn is not subjected to a load exceeding the breaking strength. .

According to the third aspect of the invention, the stop position of the ring rail by the ring rail position control means is near the top dead center in the ascending / descending region of the ring rail. In the invention according to claim 4, when the ring rail position control means inputs a position detection means for detecting the position of the ring rail and a signal indicating that the stop switch is operated,
Deceleration start position calculation means for calculating a deceleration start position of the ring rail at which the ring rail can stop at the stop position based on a deceleration pattern when the spindle is temporarily stopped; and the ring rail detected by the position detection means. And a ring rail drive control means for starting deceleration of the ring rail when the position of (1) coincides with the deceleration start position calculated by the deceleration start position calculation means.

According to a fifth aspect of the present invention, the lifting and lowering drive system for the ring rail and the spindle drive system are independent of each other, and the ring rail position control means operates the ring based on a signal that the stop switch is operated. The rail is decelerated and stopped in the ascending / descending region so as to be synchronized with the spindle, and then only the ascending / descending drive system of the ring rail is driven to stop the ring rail at a position above its top dead center, The spindle drive means has a program set to lower the ring rail to near the top dead center in the ascending / descending region based on a signal that the start switch is operated, and the spindle drive means is a signal that the start switch is operated. After completing the lowering of the ring rail based on
It has a program set to start driving the spindle.

According to a sixth aspect of the invention, the lifting drive system for the ring rail and the spindle drive system are independent of each other, and the ring rail position control means is stopped near the top dead center of the lifting area. Switch means for upwardly displacing the ring rail, and ring rail lift adjusting means for driving only the lifting drive system of the ring rail based on a signal operated by the switch means to independently lift the ring rail. A ring rail position returning means capable of returning the ring rail raised by the ring rail raising adjusting means to an initial stop position near the top dead center.

[0016]

According to the invention described in claim 1, the ring rail is stopped at the top dead center or a position above the top dead center in the lifting area (chase area) when the spinning operation is temporarily stopped. It At this time, a wide space is secured between the inner wall surface of the ring and the side surface of the pipe thread, which facilitates the traveler exchange work. Further, at the time of subsequent restart, the spindle is first accelerated at a relatively small acceleration so that the yarn is not subjected to a load higher than its breaking strength in the low acceleration region at the time of rising. for that reason,
Even if the spindle is driven in a state where the gap between the ring and the yarn is relatively wide, yarn breakage does not occur.

According to the second aspect of the present invention, the spinning machine is driven by the drive control means at a constant ratio of the vertical speed of the ring rail and the spindle rotational speed. When the stop switch is operated, the ring rail position control means stops the ring rail substantially at the top dead center in the ascending / descending region or at a position above the top dead center based on the signal. Therefore, in the paused state, a wide space is secured between the inner wall surface of the ring and the side surface of the pipe thread. When the start switch is operated, the spindle is driven by the spindle drive means based on the signal, and the acceleration is set to a relatively small value so that the yarn is not subjected to a load equal to or higher than its breaking strength during the rising process. The spindle is driven. Therefore, even if the spindle is driven in a state where the gap between the ring and the yarn is relatively wide, yarn breakage does not occur.

According to the third aspect of the present invention, when the stop switch is operated, the ring rail is stopped near the top dead center in the ascending / descending region by the ring rail position control means based on the signal, and the ring rail is temporarily stopped. In the stopped state, a wide gap is secured between the ring and the yarn. Further, since the stop position of the ring rail is within the ascending / descending region, it is not necessary to perform special position control for causing the ring rail to deviate upward from the ascending / descending region, and simple position control within the ascending / descending region is sufficient.

According to the fourth aspect of the present invention, when the signal indicating that the stop switch is operated is input, the deceleration start position calculating means causes the ring rail to stop at the stop position based on the deceleration pattern when the spindle is temporarily stopped. The possible deceleration start position of the ring rail is calculated. Then, when the position of the ring rail detected by the position detection unit coincides with the deceleration start position calculated by the deceleration start position calculation unit, the ring rail drive control unit starts deceleration of the ring rail. As a result, the speed of the ring rail becomes almost "0" at the stop position, so that the ring rail smoothly stops at the stop position without sudden braking. Moreover, since the speed of the ring rail is sufficiently reduced before the stop, the accuracy of the stop position is improved.

According to the fifth aspect of the present invention, when a signal indicating that the stop switch is operated is input, the ring rail position control means decelerates the ring rail so as to synchronize with the spindle and stops the ring rail within the ascending / descending region. Then, only the lifting drive system of the ring rail is driven, and the ring rail is stopped at a position above the top dead center. After that, when a signal indicating that the start switch is operated is input, the ring rail position control means lowers the ring rail to the vicinity of the top dead center in the ascending / descending region, and after the lowering is completed, the spindle drive means starts driving the spindle. . Therefore, the ring rail is stopped above the top dead center in the ascending / descending region, and the bobbin is not wound on the portion above the top dead center.

According to the sixth aspect of the present invention, when the switch means is operated in a state where the ring rail is stopped near the top dead center of the ascending / descending region, the ring rail ascending adjustment means produces a ring based on the signal. Only the lifting system of the rail is driven, and the ring rail rises independently. The ring rail moved up is returned to the initial (original) stop position near the top dead center by the ring rail position returning means.
Therefore, it is possible to further raise the ring rail from the predetermined stop position near the top dead center as needed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a ring spinning machine will be described below with reference to FIGS.

As shown in FIG. 2, in the center of the machine frame of the spinning machine 1, a plurality of spindle motors 2 (however,
(Only one is shown) are arranged at predetermined intervals, and the spindle 3
Are grouped into a plurality of groups in the longitudinal direction of the machine base, and are arranged in a row with their lower portions pressed against the respective tangential belts 4 driven by the respective spindle motors 2. The spindle 3 is rotationally driven by the transmission force from the tangential belt 3 that rotates by driving the spindle motor 2.

The ring rail 5 is supported at predetermined intervals by a plurality of poker pillars 6 (only one is shown in FIG. 2) arranged so as to extend vertically at predetermined intervals in the machine longitudinal direction. A nut body 7 is screwed to a screw portion 6a forming a male screw on the peripheral surface of the poker pillar 6, and a line shaft 8 extending parallel to the ring rail 5 is rotatable at a height corresponding to the nut body 7. It is installed in. The screw gear integrally formed on the nut body 7 and the screw gear fitted on the line shaft 8 mesh with each other, and the poker pillar 6 is displaced up and down in the axial direction by the forward and reverse rotation of the line shaft 8. The line shaft 8 is connected to the drive shaft of a lifting motor 9, and the ring motor 5 is moved up and down when the lifting motor 9 is driven in the forward and reverse directions.

The front bottom roller 10 is operatively connected to the drive shaft of the draft motor 11 via a speed reduction mechanism 12, and a middle bottom roller and a back bottom roller (both not shown) via a gear train (not shown). ) Is operatively connected to. Each bottom roller is a draft motor 1
The drive of No. 1 causes the rotation at a predetermined rotation speed ratio. In addition,
Both the lifting motor 9 and the draft motor 11 are arranged at the gear ends.

The spindle motor 2 is an induction motor and is connected to the control device CT via an inverter 13. Further, both the lifting motor 9 and the draft motor 11 are servo motors, and the control device CT is provided via servo drivers (servo amplifiers) 14 and 15, respectively.
It is connected to the. The motors 2, 9 and 11 are speed-controlled by the controller CT via the inverter 13 and the servo drivers 14 and 15, respectively, and the spinning amount of the front bottom roller 10 and the winding amount of the spindle 3 are always the same amount. Therefore, each of them is set to be synchronously driven at a predetermined rotation speed ratio.

Absolute type rotary encoders 2a, 9a and 11a are built in the motors 2, 9 and 11, respectively. The motors 9 and 11 are rotary encoders 9 and 11, respectively.
Feedback control is performed based on the detection signal output from the servo driver 14 or 15 to the servo driver 14 or 15. Further, the lifting motor 9 is provided with an electromagnetic brake 16.

As shown in FIGS. 2 and 4, the ring rail 5
An annular ring 5a into which the bobbin 17 can be inserted is fitted at a position corresponding to the spindle 1, and a traveler 18 is attached to the ring 5a so as to be able to travel on the circumference of its upper end. The yarn y spun from the front bottom roller 10 is a snell wire 19, an anti-node ring 20, a traveler 1.
The bobbin 17 is wound around the bobbin 17 via 8, and as the ring rail 5 rises by a predetermined amount (shaper step amount Δs) each time the ring rail 5 moves up and down, a yarn is formed from the lower part to the upper part of the bobbin 17. As shown in FIG. 4, the anti-node ring 2
0 is supported by the ring rail 5 via a bracket 21.

As shown in FIG. 2, the control device CT has a microcomputer 22 built therein.
2 includes a central processing unit (hereinafter referred to as CPU) 23, a program memory 24, a work memory 25, an input interface 26, and an output interface 27. Further, the CPU 23 includes a counter circuit (hereinafter, simply referred to as “counter”) 23a and a timer 23b.

The program memory 24 is a read-only memory (ROM), and the CPU 23 is the program memory 2
4 operates according to predetermined program data stored in the memory 4. The work memory 25 is a readable / writable memory (RAM), and temporarily stores production condition data input by an input device 28, which will be described later, calculation processing results in the CPU 23, and the like. The working memory 25 has a backup power supply (not shown).

Input device 28, start switch 29, stop switch 30, emergency stop button 31, rotary encoder 2a,
9a and 11a are connected. The CPU 23 also outputs the motor drive circuits 32, 3 via the output interface 27.
3, 34 and the excitation / demagnetization circuit 35.

The input device 28 is for inputting production condition data before the start of machine operation. As the production condition data, spinning conditions such as fiber type, spun yarn count and draft ratio,
The yarn weight w, the lift length Lt, the chase length C, the spindle rotation speed (maximum rotation speed) Vmax during steady operation, etc. are input. The spindle speed Vmax is approximately 5000 to 25000 rpm, although it varies depending on the spinning conditions.

The start-up switch 29 is used for starting the machine operation when starting the machine operation and restarting when the machine operation is temporarily stopped. Further, the stop switch 30 is used during traveler replacement, constant cleaning work, maintenance work, etc., and the emergency stop button 31 is used during emergency stop such as trouble occurrence.

In the program memory 24, a shift pattern of the spindle rotation speed is stored in advance, and a deceleration pattern at the time of temporary stop and an acceleration pattern at the time of restart are stored therein. The CPU 23 calculates the shift pattern of the acceleration process at the start of operation (start of production) based on the spindle speed (steady speed) Vmax input and set as the production condition data by the input device 28 before the start of machine operation, and the start switch 29 By pressing the button, the steady speed V
A speed control signal is output to the motor drive circuits 32-34 so as to drive the spindle 3 up to max.

The counter 23a is a rotary encoder 9a.
The number of pulses of the detection signal from is counted, and the count value P corresponding to the position of the ring rail 5 is counted. The CPU 23, based on the production condition data such as the yarn weight w, the lift length Lt, the chase length C, etc., 1 double stroke length Ld of the ring rail 5.
, Step amount Δs is calculated, and based on these data, the moving amount from the bottom dead center to the top dead center of the ring rail 5 (= (Ld
Pulse value P of the counter 23a corresponding to + Δs) / 2)
Counter 2 corresponding to U and 1 double stroke length Ld
The pulse value PL of 3a is calculated. These pulse values P
U and PL are preset in the counter 23a before the operation of the machine base is started. The count value P of the counter 23a is
While the machine is operating, the ring rail 5 completes one double stroke and the count value P reaches the pulse value PL (P = PL
) It is reset every time.

Each time the count value P of the counter 23a reaches the pulse value PU or the pulse value PL, the CPU 23 outputs a normal rotation signal and a reverse rotation signal to the motor drive circuit 33 to control the lifting motor 9 in the normal rotation direction. Therefore, the ring rail 5 is moved up and down with a stroke substantially equal to the chase length C based on the forward and reverse rotations of the lifting motor 9, and the up and down position is moved upward by a step amount Δs for each up and down movement. The timer 23b is used to measure the spindle rotation speed, and the CPU 23 counts the pulse number of the detection signal input from the rotary encoder 2a per unit time to calculate the spindle rotation speed Vs.

The program memory 24 stores operation control processing program data at the time of temporary stop shown in the flowchart of FIG. 3, and the CPU 23 executes this processing based on the pressing of the stop switch 30 and the start switch 29 during the production.

Further, as shown in FIG. 1, the program memory 24 calculates the pulse value PD of the deceleration start position Ds of the ring rail 5 which is the timing for starting the deceleration of the machine operation (spindle rotation speed) during the temporary stop. An arithmetic expression for doing is stored. As shown in FIG. 1, the deceleration start position Ds moves up and down while decelerating in proportion to the spindle rotation speed Vs when the spindle 3 is decelerated at a deceleration β from the spindle rotation speed Vmax when the stop switch 30 is pressed. The ring rail 5 is a deceleration start position of the ring rail 5 at which the speed becomes “0” at the top dead center in the chase area.

If the rotation amounts of the spindle 3 and the lifting motor 9 from the spindle rotation speed Vs until the spindle 3 stops are ΔNs and ΔNr, ΔNr =
M · ΔNs (where M is a proportional coefficient determined by the rotation speed ratio between the lifting motor and the spindle). Here, the rotation amount of the lifting motor 9 required for the ring rail 5 to move by one double stroke Ld is ΔNrd.
And the rotation amount of the lifting motor 9 required to move the ring rail 5 from the bottom dead center to the top dead center (that is, the chase length C) is ΔNrc, the ring rail 5 reaches the deceleration start position Ds and the lifting is performed. By the time the motor 9 is decelerated and the rotation amount (ΔNr −ΔNrc) is completely rotated, the rotation from the deceleration start position Ds to the first bottom dead center (rotation amount Δ
No) and the rotation from there to the last bottom dead center (rotation amount n
.DELTA.Nrd (where n is an integer; .gtoreq.0). Therefore, the number of pulses corresponding to the rotation amount ΔNo from the deceleration start position Ds to the first bottom dead center is (ΔNr-ΔNrc) / Δ
When the value of Nrd = A and below the decimal point is k (<1), the pulse value corresponding to one double stroke length Ld is "PL", so the pulse value PD of the deceleration start position Ds is PD =
It is represented by (1-k) .PL. Here, k = A- [A]
(However, [] is Gaussian symbol) and ΔNr = M ·
ΔNs = -M · Vs ² / (2β) and ΔNr
Since c and ΔNrd are constants, k = A− [A] = f
(Vs), PD = (1-f (Vs)). PL ...
It is indicated by (1). This formula (1) is the program memory 2
It is stored in 4.

The CPU 23 determines the spindle rotation speed Vs at that time based on the depression signal indicating that the stop switch 30 has been depressed.
Then, the pulse value PD of the deceleration start position Ds at which the ring rail 5 can be stopped at the top dead center is calculated based on the calculation formula (1) stored in the program memory 24. When the count value P of the counter 23a first reaches the pulse value PD after the calculation of the pulse value PD, each of the motor drive circuits 32 to
A deceleration command signal is output to 34, and the spindle rotation speed is
The motors 2, 9 and 11 are decelerated so as to draw the deceleration pattern (deceleration β) shown in FIG.

When the output voltage of the inverter 13 becomes "0" during this deceleration process, the CPU 23 outputs an excitation signal to the excitation / demagnetization circuit 35 to activate the electromagnetic brake 16 and forcibly brake the inertia rotation of the lifting motor 9. It is designed to let you. When the stop switch 30 is pressed during acceleration, the spindle rotation speed Vs at that time is temporarily held, and the deceleration start position PD is calculated based on the spindle rotation speed Vs. .

Further, the working memory 25 stores an acceleration pattern at the time of restarting after the start switch 29 is pressed after being temporarily stopped (including emergency stop).
As shown in FIG. 1, the acceleration pattern has a low acceleration α1 (about 1000 rpm in this embodiment) up to a predetermined rotation speed V1.
/ Sec.) Rise area accelerated by a predetermined speed V
It consists of a normal acceleration region in which the acceleration is from α1 to the steady speed Vmax at an acceleration α2 (about 2000 rpm / sec. In this embodiment). The predetermined rotation speed V1 is set in consideration of the load applied to the yarn y at the time of rising and the time required to reach the steady speed, and is set to 3000 rpm in this embodiment. Further, the acceleration α1 in the rising region can be appropriately changed within a range smaller than the acceleration α2 so that the yarn y is not loaded.

Next, the operation of the ring spinning machine configured as described above will be described. Input device 2 in advance before starting machine operation
Spinning conditions such as fiber type, spun yarn count, draft ratio, etc. from 8.
Production condition data such as the yarn weight w, the lift length Lt, the chase length C, and the spindle rotation speed (maximum rotation speed) Vmax during steady operation are input. The CPU 23 determines the pulse value PU corresponding to the top dead center of the ring rail 5 and the pulse value PL corresponding to the double stroke length Ld from the data of the double stroke length Ld and the step length Δs calculated using this production condition data. Are calculated and preset in the counter 23a. Further, the CPU 23 calculates the acceleration pattern at the start of production from the input spindle speed Vmax.

First, when the start switch 29 is pressed,
The CPU 23 outputs a speed command signal to the motor drive circuits 32 to 34 so as to follow the previously calculated acceleration pattern, and controls the speed of each of the motors 2, 9, 11 at a predetermined acceleration. At this time, the counter 23a counts the number of pulses of the detection signal from the rotary encoder 9a, and the counter 2
Each time the count value P of 3a coincides with the pulse values PU and PL,
A forward / reverse rotation signal is output from the CPU 23 to the motor drive circuit 33. By driving the lifting motor 9 in the forward and reverse directions, the ring rail 5 moves up and down by a stroke equal to the chase length C while moving upward by a step length Δs for each vertical movement. Then, the spindle rotation speed Vs is the steady speed Vm.
When it reaches ax, the machine operation is maintained at its steady speed.

The operation control process at the time of temporary stop will be described below with reference to the flowchart of FIG. The traveler exchange is performed by temporarily stopping the operation of the machine frame when the yarn K has a predetermined number of balls. When the stop switch 30 is pressed in step S1 (time ts in FIG. 1), the CPU 23 executes step S1.
2, the number of pulses per unit time input from the rotary encoder 2a is counted, and the spindle rotation speed Vs (= Vmax) at that time is obtained. And C
The PU 23 uses the spindle speed Vmax to calculate a pulse value PD (= (1-f (Vmax)) corresponding to the deceleration start position Ds of the ring rail 5 based on the equation (1) stored in the program memory 24. ) .PL) is calculated.

In step S3, the CPU 23 determines whether the count value P of the counter 23 matches the pulse value PD. When the count value P matches the pulse value PD, CP
The U23 proceeds to step S4 and outputs a speed command signal to the motor drive circuits 32 to 34 so that the spindle rotation speed Vs is decelerated at the deceleration β and becomes the spindle rotation speed "0". As a result, the ring rail 5 moves to the deceleration start position Ds.
At the same time (time tD in FIG. 1), the spindle speed Vs is decelerated at a deceleration β so as to draw the deceleration pattern in FIG. 1, and the ring rail 5 and the front bottom roller 10 are decelerated in synchronization with this. To do.

In step S5, the CPU 23 determines whether the output voltage from the inverter 13 has become "0". When the output voltage becomes "0", the CPU 23 proceeds to step S6 and outputs an excitation signal to the excitation / demagnetization circuit 35 to operate the electromagnetic brake 16. as a result,
As shown in FIG. 4, the ring rail 5 stops at the top dead center. At this time, the spindle 3 is stopped with a slight delay after the brake of the ring rail 5 is stopped by inertial rotation, so that the yarn y is held in a tensioned state and no snare is generated.

In this temporarily stopped state, the ring rail 5 is located at the top dead center as shown in FIG. 4, and the ring 5a and the yarn K
A wide gap G1 is secured. Therefore, the traveler can be easily replaced, and since the gap between the ring and the yarn is small as described in the related art, the hand does not hit the yarn and damage the yarn. Further, since the wide gap G1 is already secured at the temporary stop position, there is no concern that the ring rail 5 will be forcibly lifted by hand, and the ring rail as described in the prior art is restarted without being returned. There is no need to worry about thread breakage.

When all the traveler exchanges are completed and the operator depresses the start switch 29 (step S7), the CPU 23 causes the motor drive circuits 32 to operate in step S8.
, 34, the rotation speed V1 (= 30) of the spindle 3 from the speed "0" at the acceleration α1 (= 1000 rpm / sec.).
The speed command signal is output so as to be accelerated up to 00 rpm). As a result, as shown in FIG. 1, the spindle 3 is accelerated with a relatively small rising acceleration α1. This rising acceleration α1 is due to the gap G between the ring 5a and the yarn K.
Considering 1 (that is, considering the magnitude of the component of the tension applied to the yarn y other than the moving direction of the traveler 18 at the time of rising), the yarn y is set so as not to be subjected to a load higher than its tensile strength. Therefore, the traveler 18 starts to rotate slowly, and the yarn y is not heavily loaded.

In this rising area, the CPU 23
The spindle rotation speed Vs is the rotation speed V1 (3000 rp
It is determined whether or not m) has been reached (step S9). When the spindle rotation speed Vs reaches the rotation speed V1 (3000 rpm), the CPU 23 proceeds to step S10, and the spindle 3 moves from the speed to the steady speed Vmax (= 18000 rp).
The speed commands for the motors 2, 9 and 11 are switched so as to accelerate with acceleration α 2 (= 2000 rpm / sec.) up to m). As a result, as shown in FIG. 1, when the spindle rotation speed Vs reaches the rotation speed V1, it is switched to the acceleration α2 and is accelerated to the steady speed Vmax at the acceleration α2. The rotation of the traveler 18 is sufficiently stable by the rotation speed V1 at which the acceleration is switched.

For example, when the rising region is not set and the vehicle is uniformly accelerated at 2000 rpm / sec. (Chain line in FIG. 1), it takes about 9 seconds to reach the steady speed Vmax = 18000 rpm. On the other hand, in the present embodiment, the acceleration is 1000 rpm / sec up to 3000 rpm.
Acceleration, then steady speed Vmax = 18000 rpm
Since it is accelerated up to 2000 rpm / sec., It takes about 10.5 seconds to reach the steady speed Vmax = 18000 rpm, which is only about 1.5 seconds slower than when the rising area is not set. , Will not lead to a decrease in productivity.

As described above in detail, according to this embodiment, when the stop switch 30 is pushed down for the purpose of traveler exchange or the like, the operation of the machine base is stopped so that the ring rail 5 is located at the top dead center. . Therefore, even if the traveler is replaced with the ring rail 5 placed in the stop position, the ring 5a
Since a wide gap G1 is secured between the yarn and the yarn K, it is easy to change the traveler. Also, since the traveler replacement work is performed with the wide gap G1 being secured, the yarn K may be damaged by accidentally hitting a hand or a replacement jig due to the small gap during the traveler replacement. Can be prevented.

Further, as described in the prior art, since it is not necessary to change the position of the ring rail to facilitate the traveler exchange after the machine stand is stopped, it is possible to immediately change the traveler without any extra working operation after the machine stand is stopped. The replacement work can be started. Further, by changing the position of the ring rail after the machine base is stopped, there is no fear of causing thread breakage.

Further, the rising acceleration α1 of the spindle 3 at the time of restart is set relatively small so that the load acting on the yarn due to the resistance of the traveler 18 at the time of rising does not exceed the tensile strength in consideration of the gap G1. Since the size is reduced, it is possible to prevent the yarn breakage even if the operation is restarted from the state where the ring rail 5 is arranged at the top dead center.

Further, although the acceleration is accelerated with a small acceleration α1 in the rising region at the time of restart, the steady speed Vma
The time required to reach x is about 1.5 when the steady-state speed is about 18000 rpm, as compared to the uniform acceleration α2.
This does not reduce the productivity of the spinning machine because it only delays by a second.

The present invention is not limited to the above embodiments, but may be constructed as follows, for example, within the scope of the invention. (1) The ring rail 5 may be stopped above the top dead center. For example, when the stop switch 30 is pressed, the ring rail 5 is stopped at the top dead center within the chase range so as to synchronize with the spindle rotation speed, and only the lifting motor 9 is driven from the stop position to move from the top dead center. It is automatically raised to a predetermined stop position above and stopped. When the work at the stop position (position above the top dead center) is completed and the start switch 29 is pressed, the ring rail 5 is lowered to the position of the top dead center of the final chase and the operation of the machine is restarted from that position. To do so. The number of pulses from the rotary encoder 9a when the ring rail 5 descends is counted by the counter 2
By subtracting from the count value P of 3a and stopping the lowering of the ring rail 5 when the count value P coincides with the pulse value PU of the top dead center, the ring rail 5 is stopped at the top dead center of the final chase. Can be made. Further, the rising acceleration α1 at the time of restart is set to be relatively small as in the above embodiment so that yarn breakage does not occur. According to this configuration, the ring rail 5 is stopped above the top dead center, and the ring 5
Since the gap on the inner wall surface side of "a" is ensured to be wide in the depth direction as well, it is easier to carry out the traveler exchange work and the tube yarn K need not be much concerned. Further, when the ring rail 5 is stopped at the top dead center within the chase range when the machine is stopped, only the ring rail 5 is raised and lowered between the stop position above the top dead center and the bobbin 17 On the other hand, the yarn is not wound above the top dead center. for that reason,
The tubular thread shape does not deviate from the desired shape, and the thread can be released smoothly even in the winder process. Further, after the operation of the machine base is stopped, the ring rail 5 is displaced upward from the top dead center, and the amount of the displacement ascended is relatively small. The first stop position of the ring rail 5 is not limited to the top dead center and may be another position in the chase area.

(2) In the above (1), the ring rail 5 is automatically stopped at a predetermined position above the top dead center. However, the ring rail 5 is temporarily stopped at the top dead center, and the operator Depending on the judgment, the work switch 36 shown by the chain line in FIG. 2 may be pressed to perform the upward displacement from the top dead center. When the start switch 29 is pressed after the traveler replacement work is completed, when the work switch 36 is pressed, the ring rail 5 is lowered to the top dead center at the time of the temporary stop, and then the operation of the machine base is restarted. . According to this configuration, when it is determined that the work is difficult when the ring rail 5 is stopped at the top dead center, the ring rail 5 can be appropriately raised to a position where the work is easy. Note that the temporary stop position of the ring rail 5 is not limited to the top dead center, and may be in the vicinity of the top dead center in the chase area. (3) Calculate the deceleration start position where the ring rail 5 can be stopped above the top dead center, and do not reverse when the final top dead center is reached during the deceleration process at the time of temporary stop, but above the top dead center. It may be configured to stop at the stop position. At this time, if the rotation amount of the lifting motor 9 required to move from the bottom dead center of the final chase to the stop position (position above the top dead center) is ΔNrx, and (ΔNr−ΔNrx) / ΔNrd = B is set (however, ΔNr is the total amount of rotation from the spindle speed Vs to the stop, ΔNrd is the amount of rotation per double stroke), ΔNrx and ΔNrd are constants, and ΔNr = −M · Δ
Since there is a relationship of Ns = −M · Vs ² / (2β),
B is uniquely determined by the spindle speed Vs. This B
The value k1 after the decimal point of is k1 = B- [B] = g (Vs
), The deceleration start position PD in this case is PD
= (1-k1) .PL = (1-g (Vs)). PL ...
It is shown by (2).

Also, during this deceleration process, the spindle speed Vx (r
pm) is the deceleration of the spindle 3 β (rpm / sec.)
Then, Vx = {(-2β / 60) · M · ΔNrx}
^{Expressed as 1/2} . CPU23 is the spindle rotation speed Vs
Is less than or equal to Vx, the lifting motor 9 is not rotated in reverse even if the count value P of the counter 23a matches the pulse value PU, and the electromagnetic brake 16 is actuated when the output voltage of the inverter 13 becomes "0". Braking 9 By doing so, the ring rail 5 is stopped at a predetermined stop position above the top dead center.

Further, at the time of restart, the ring rail 5 descending from the stop position moves to the bottom dead center of the chase and is then inverted. For example, the count value P of the counter 23a is subtracted by the method described in the above (2) until it becomes the pulse value PU, and when it becomes P = PU, it is switched to the addition. Further, the count value Px at the stop position (above the top dead center) may be reset to Px-2 (Px-PU) so that the count value Px = PL at the bottom dead center.
According to this configuration, the yarn is wound around the bobbin 17 above the top dead center, but there is no problem as long as it does not affect the tubular yarn shape or the release of the yarn in the winder process.

(4) When the ring rail 5 reaches the final top dead center in the deceleration process during the temporary stop, the spindle speed Vs becomes "0" and the ring rail 5 has a predetermined speed. Alternatively, the deceleration start timing of the ring rail 5 may be slightly delayed from that of the spindle 3, and the ring rail 5 may be stopped at a position above the top dead center without being reversed when it reaches the last top dead center. In this case, the deceleration start position is set such that the ring rail 5 has a speed of "0" at a predetermined stop position (position above the top dead center). That is, the deceleration start position is calculated based on the formula (2) of the above (4), and the deceleration start of the spindle speed is started earlier than the deceleration start position by an amount corresponding to the rise of the stop position relative to the top dead center. The deceleration of the ring rail 5 may be started at the position. According to this configuration, the ring rail 5 can be stopped above the top dead center of the chase area so that the yarn is not wound around the bobbin 17 above the top dead center.

(5) A stop switch for exchanging travelers and a stop switch for ordinary temporary stop are provided, and the ring rail 5 is located near the top dead center in the chase area only when the stop switch for work is pressed. Alternatively, the ring rail 5 is stopped at a position above the top dead center, and when a normal stop switch is pressed, the ring rail 5 is moved to an appropriate position (for example, 20 to 3 from the top dead center).
It may be stopped at 0 mm downward). At this time, the restart sets the acceleration α1 at the start-up relatively small only when the work stop switch is pressed, and sets the start-up acceleration small when the normal stop switch is pressed. do not do. According to this configuration, when the normal stop switch is used, the time required to reach the steady speed Vmax at the time of restart becomes short.

(6) The temporary stop position of the ring rail 5 is
The position is not limited to the top dead center and may be below the top dead center.
Here, the "substantially top dead center" referred to in claims 1 and 2 is the position of the ring rail below the top dead center at which the gap between the ring and the yarn can be secured at a predetermined value or more, and It is determined by the difference between the inner diameter and the outer diameter of the yarn, and may be, for example, 20 mm below the top dead center (<20 mm) near the upper limit of the range of the appropriate position described in the prior art.

(7) In the above-mentioned embodiment, the rising region is set to the spindle rotation speed V1 = 3000 rpm or less, but the setting range of the rising region is sufficient if the traveler 18 can rotate stably. Within 5 seconds from the start point of rising, V1 = approx. 5 at spindle speed
The range of 000 rpm or less is preferable.

The invention grasped from the above embodiment and not described in the scope of the claims will be described below together with the effect thereof. (A) In the invention according to claim 2, the stop position of the ring rail by the ring rail position control means is the top dead center of the ring rail. According to this configuration, it is possible to secure the widest gap between the ring and the yarn in the stop position in the lifting region.

[0065]

As described in detail above, according to the first and second aspects of the present invention, when the spinning operation is temporarily stopped, the ring rail is substantially located at the top dead center or above the top dead center in the ascending / descending region. Stopping at the position secures a wide space between the ring and the thread, facilitating the traveler replacement work, and at the time of restarting, the spindle does not rise above the tensile strength of the thread so that the thread does not rise. Since it is driven by acceleration, there is an excellent effect that it is possible to prevent the occurrence of yarn breakage.

According to the third aspect of the invention, since the ring rail is stopped at the top dead center or near the bottom dead center when the spinning operation is temporarily stopped, the ring rail is deviated from the ascending / descending region. There is no need to perform a special position control for moving upward, and it is possible to secure a wide interval between the ring and the yarn by only controlling the stop position within the ascending / descending region.

According to the fourth aspect of the invention, the deceleration of the ring rail is started from the deceleration start position calculated so that the ring rail can be stopped at the stop position based on the deceleration pattern of the spindle speed. Thus, the ring rail can be smoothly stopped at the stop position without sudden braking being applied, and the stop position accuracy can be improved.

According to the fifth aspect of the present invention, the ring rail is stopped at a position above the top dead center at the time of temporary stop, and the gap between the ring and the yarn is secured wide in the depth direction. In addition to facilitating the replacement work, the thread is not wound around the bobbin above the top dead center, so the shape of the tube thread is not affected.

According to the sixth aspect of the present invention, the ring rail stopped at the predetermined stop position near the top dead center can be further raised to a height at which work can be easily performed, and raised. Since the ring rail is returned to the initial (original) stop position, it is possible to prevent the winding position of the yarn from shifting before and after the winding position.

[Brief description of drawings]

FIG. 1 is a graph showing a spindle rotation speed when a ring spinning machine is temporarily stopped.

FIG. 2 is a schematic view of a ring spinning machine.

FIG. 3 is a flowchart showing operation control processing operation at the time of temporary stop.

FIG. 4 is a partially cutaway side view showing a stop position of the ring rail.

FIG. 5 is a partially cutaway side view showing a stop position of a conventional ring rail.

[Explanation of symbols]

1 ... Spinner as spinning machine, 3 ... Spindle, 5 ... Ring rail, 2 ... Drive control means, spindle drive means and spindle motor as spindle drive system, 13 ... Drive control means, spindle drive means An inverter, 32 ... Similarly a motor drive circuit, 9 ... A drive control means, a ring rail position control means, a ring rail drive control means, a ring rail lift adjusting means, and a ring rail position restoring means, and a lifting motor as a lifting drive system, 14 ... Servo driver constituting drive control means, ring rail position control means, ring rail drive control means, ring rail lift adjusting means and ring rail position returning means, 33 ... Motor drive circuit, 9
a ... rotary encoders constituting the ring rail position control means and position detection means, 23a ... also counters, 22
... drive control means, ring rail position control means, microcomputer constituting the spindle drive means, 23 ... ring rail position control means, position detection means, deceleration start position calculation means, ring rail rise adjustment means and ring rail position return means CPU constituting 24, program memory constituting deceleration start position calculating means, 29 ... start switch, 30 ... stop switch, 36 ... work switch as switch means, PD ... deceleration start position (count value),
y ... thread.

Claims (6)

[Claims] 1. A spindle for stopping a ring rail in the ascending / descending region at or substantially above the top dead center when the spinning operation is temporarily stopped so that the yarn is not subjected to a load higher than the breaking strength when restarted. Control method at the time of a temporary stop of the spinning machine, which is provided with a low acceleration region in which the acceleration at the time of rising is set to be relatively small. 2. In a spinning machine driven by the drive control means at a constant ratio of the ascending / descending speed of the ring rail and the spindle rotation speed, a stop switch for temporarily stopping the spinning operation, and a signal for operating the stop switch. Based on the above, the ring rail position control means for stopping the ring rail in the ascending / descending region at or substantially above the top dead center, a start switch for restarting the spinning machine that is temporarily stopped, and the start switch are The operation of the spinning machine at the time of suspension while driving the spindle based on the operated signal and including the spindle driving means in which the acceleration in the rising process is set to be relatively small so that the yarn is not subjected to a load exceeding the breaking strength. Control device. 3. The operation control device according to claim 2, wherein the stop position of the ring rail by the ring rail position control means is in the vicinity of top dead center in the ascending / descending region of the ring rail. 4. The ring rail position control means, when the position detection means for detecting the position of the ring rail and a signal for operating the stop switch are input, the ring rail can be stopped at the stop position. The deceleration start position calculation means for calculating the deceleration start position of the ring rail based on the deceleration pattern when the spindle is temporarily stopped, and the position of the ring rail detected by the position detection means are calculated by the deceleration start position calculation means. The operation control device at the time of a temporary stop of the spinning machine according to claim 2 or 3, further comprising: a ring rail drive control unit that starts deceleration of the ring rail when the deceleration start position is adjusted. 5. The lifting drive system for the ring rail and the spindle drive system are independent of each other, and the ring rail position control means moves the ring rail within its lifting area based on a signal that the stop switch is operated. It was decelerated so as to be synchronized with the spindle and stopped, and then only the lifting drive system of the ring rail was driven to stop the ring rail above the top dead center and the start switch was operated. A spindle drive means for lowering the ring rail based on a signal that the start switch is operated. 3. Suspending the spinning machine according to claim 2, comprising a program set to start driving the spindle after completion. Operation controller in. 6. A lift drive system for the ring rail and a spindle drive system are independent of each other, and the ring rail position control means displaces the ring rail stopped near the top dead center of the lift region upwardly. Switch means for driving the ring rail, and a ring rail lift adjusting means for driving only the lifting drive system of the ring rail based on a signal operated by the switch means, and independently lifting the ring rail, and the ring rail lift adjusting means. 5. The operation control device for temporarily stopping the spinning machine according to claim 3 or 4, further comprising: ring rail position returning means capable of returning the ring rail raised by the above to the initial stop position near the top dead center. .