JPH05222625A - Method for changing over lifting and lowering of bobbin rail in roving frame - Google Patents

Abstract

PURPOSE:To surely carry out the formation of a roving package in the objective shape even if a delay in response is present during a period from an output of a command on lifting and lowering changeover to the actual reversing of a bobbin rail by completing the disconnection and connection of a clutch. CONSTITUTION:The lifting and lowering changeover of a bobbin rail is carried out by disconnecting and connecting a clutch based on a command from a controller. The position of the bobbin rail is always obtained by a position sensing means for the bobbin rail and the extent of delay in response is determined during a period from an output of a command on lifting and lowering changeover from the controller to the actual reversing of the bobbin rail. The extent of delay in response is calculated based on the extent of delay in response in reversing the bobbin rail before the time of outputting the command on the lifting and lowering changeover to output the command on the lifting and lowering changeover when the bobbin rail attains a position before the bobbin rail reversing position by the calculated extent of delay in response.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin rail up / down switching method in a roving frame, and more particularly to a bobbin rail up / down switching method in a roving frame in which the up / down movement of the bobbin rail is switched by disengaging / engaging a clutch. Is.

[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 on the roving due to a difference in rotational speed between a flyer rotating at a predetermined speed and a bobbin rotating at a higher speed. Wind it on a bobbin while hanging it. The bobbin is supported by the bobbin rail and is moved up and down together with the bobbin rail, and the moving distance of the bobbin rail is shortened each time the direction of the bobbin rail lifting movement is changed, so that both ends of the roving bobbin have a conical shape. Is taken up.

[0003] If winding is not performed so that the amount of roving yarn delivered and the amount of roving yarn are approximately the same during winding, normal winding will not be performed, and yarn unevenness and roving breakage due to fluctuations in tension of the roving yarn will occur. Occurs. Therefore, conventionally, a transmission using a pair of cone drums and a belt shifter has been controlled so that the rotational 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 data inputted in advance into a storage device in accordance with spinning conditions (for example, Japanese Patent Laid-Open No. 6-58242).
3-264923, JP-A-3-40819, etc.). In this way, in the roving machine configured to drive the spinning drive system and the winding drive system by different variable speed motors respectively, it is possible to easily change the roving winding shape, that is, the inclination of the shoulder portion of the roving winding. There is one in which the up / down movement of the bobbin rail is switched by a clutch. Then, conventionally, when the bobbin rail reaches the reversal position for forming the desired roving winding shape, an up / down switching command is issued and the bobbin rail is reversed.

[0005]

However, in the conventional lifting / lowering switching method, there is a response delay on the driven side in the sense that the response delay of the clutch is also included in the lifting mechanism. Therefore, as shown in FIG. 6, the bobbin rail is reversed after a predetermined time has passed from the switching of the excitation / demagnetization of the clutch, and as a result, the bobbin rail is reversed at a position beyond the predetermined reverse position. Therefore,
As shown in (b), the shape of the roving spool F actually formed (the lag reversal position shown by the solid line) does not become the target shape (the excitation / demagnetization switching position shown by the chain line), and there is a risk of shoulder collapse. It is also very popular. Therefore, if the inclination Θ of the shoulder portion Fa of the roving bobbin F is reduced to increase the amount of roving bobbin winding, there is a problem that the risk of shoulder collapse increases. Then, when the roving frame is operated at a high speed, this problem becomes more remarkable.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a roving machine for switching a bobbin rail up and down by disengaging / engaging a clutch based on a command from the controller. To provide a bobbin rail up / down switching method capable of reliably performing roving winding forming of a desired shape even if there is a response delay from the output of the up / down switching command until the bobbin rail is actually inverted. It is in.

[0007]

In order to achieve the above-mentioned object, according to the present invention, a bobbin rail position detecting means is provided in a roving machine for switching the bobbin rail up and down by engaging / disengaging a clutch based on a command from a control device. The position of the bobbin rail is always obtained with, and the response delay amount from the output of the up / down switching command from the controller until the bobbin rail is actually inverted is obtained, and the bobbin rail inversion before the time when the up / down switching command is output is obtained. The subsequent response delay amount is calculated based on the response delay amount at the time, and the calculated response delay amount is in front of the bobbin rail inversion position for forming the roving winding shape defined by the spinning conditions. An up / down switching command is output when the bobbin rail reaches the position.

[0008]

The bobbin rail up / down switching is performed by disengaging / engaging the clutch of the bobbin rail elevating mechanism, and disengagement / engagement of the clutch is performed based on a command from the control device. The position of the bobbin rail is always obtained by the position detecting means. The controller determines the response delay amount from the position of the bobbin rail until the bobbin rail is actually inverted after the up / down switching command is output. The control device calculates the subsequent response delay amount based on the response delay amount at the time of reversing the bobbin rail before the time when the up / down switching command is output. Then, the control device issues an elevating / lowering command when the bobbin rail reaches a position before the bobbin rail reversing position for forming the roving winding shape determined by the spinning conditions, which is the position before the calculated response delay amount. Output. As a result, the actual bobbin rail reversal position becomes the bobbin rail reversal position for roving winding shape molding determined by the spinning conditions.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. First, a drive system of a roving machine for carrying out the method of the present invention will be described with reference to FIG. This drive system is basically the same as that previously proposed by the applicant of the present application (Japanese Patent Laid-Open No. 63-264923, etc.), but the bobbin rail up / down switching mechanism is different. 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 gear train 5 and a belt transmission mechanism 6 are provided between one end of a rotary shaft 3 a having a front roller 3 constituting the draft section 1 and a driving shaft 4. Are arranged. The driving shaft 4 is connected to the main motor M1 via a belt transmission mechanism 7. A drive gear 10 is fitted to a rotary shaft 9 to which the rotation of the driving shaft 4 is transmitted via a belt transmission mechanism 8. A driven gear 12 that meshes with a drive gear 10 is fitted and fixed on an upper portion of a flyer 11 that constitutes the flyer portion 2 so as to be integrally rotatable. A pulse encoder E1 for detecting the rotation speed of the front roller 3 is connected to one end of the rotary shaft 3a.

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
Is transmitted to the rotary shaft 16 via the gear train 19, the universal joint 20, and the connecting shaft 21. Also, the winding motor M
2, a pulse encoder E2 is attached.

A lifter rack 22 constituting a lifting drive system is fixed to the bobbin rail 14. The rotation of the lifting / lowering motor M3 is transmitted to the rotating shaft 24 fitted with the pinion 23 that meshes with the lifter rack 22 via the belt transmission mechanism 25 and the gear train 26. Gear train 26
An elevating / lowering switching mechanism 29 equipped with a pair of electromagnetic clutches 27, 28 is disposed in the middle of the direction of rotation, and the direction of rotation of the rotary shaft 24, that is, the direction of up / down movement of the bobbin rail 14 is caused by the demagnetization of the electromagnetic clutches 27, 28. It is supposed to be changed. A pulse encoder E3 is connected to one end of the rotary shaft 24 as position detecting means for detecting the vertical position of the bobbin rail 14. Both electromagnetic clutch 2
7, 28 are excited and demagnetized based on a command from the control device 30,
Both electromagnetic clutches 27 and 28 are never excited at the same time. The bobbin rail 14 is moved up when one electromagnetic clutch 27 is excited, and is moved down when the other electromagnetic clutch 28 is excited. The motors M1 to M3 are driven via independent inverters 31 to 33 which are controlled based on a command from the control device 30.

As shown in FIG. 3, the microcomputer 34 constituting the control device 30 is a central processing unit (hereinafter referred to as a CP.
35), a program memory 36 including a read-only memory (ROM) storing a control program,
Input data input by the input device 37 and the CPU 3
Working memory 38 comprising a readable and rewritable memory (RAM) for temporarily storing the arithmetic processing result in 5
The CPU 35 operates based on the program data stored in the program memory 36. The input device 37 for inputting the spinning conditions such as the type of fiber, the number of fibers, the number of twists, the bobbin diameter at the start of winding, the predetermined winding amount up to a full pipe (full pipe length), and the shoulder angle to the working memory 38 is The control device 30 is integrally incorporated as a keyboard.

The CPU 35 outputs a speed instruction to the main motor M1, the winding motor M2, and the lifting motor M3 based on the spinning condition input by the input device 37, the output interface 39, the main motor drive circuit 40, and the winding motor. The output is provided to the inverters 31 to 33 via the drive motor drive circuit 41 and the lifting motor drive circuit 42.
The CPU 35 uses the pulse encoders E1, E2, E3
Based on the output signal from the motor, it is confirmed that the motors M1, M2, M3 are driven according to the command. Further, the CPU 35 can always calculate the position of the bobbin rail 14 based on the output signal from the pulse encoder E3. CPU 35 is a pulse encoder E3
The counter calculates the amount of movement of the bobbin rail 14 from the start of integration based on the integrated value of the number of pulses from the counter, and the position of the bobbin rail 14 from the position of the bobbin rail 14 at the start of integration and the integrated value. calculate. The counter is reset when the bobbin rail 14 is reversed. The pulse encoder E3 outputs different pulse signals corresponding to the forward rotation and the reverse rotation of the rotary shaft 24, so that the rise and fall of the bobbin rail 14 can be confirmed from the pulse signal. Is becoming

The electromagnetic clutches 27 and 28 are the CPU 35.
The excitation / demagnetization of the bobbin rail 14 is controlled via the electromagnetic clutch excitation / demagnetization circuit 43 on the basis of the signal from the above, so that the bobbin rail 14 is switched up and down. Then, every time the CPU 35 outputs the up / down switching signal, the pulse encoder E3 calculates the overrun amount as the response delay amount from the output of the up / down switching signal to the actual inversion of the bobbin rail 14.
The calculation is performed based on the output signal from the.
Further, the CPU 35 counts the number of times the bobbin rail 14 has been reversed by a counter for counting the number of times of reversal (not shown).

Next, a method of determining the excitation / demagnetization switching timing of the clutch for forming the roving spool shape set by the spinning condition will be described. The amount of overrun is a function of the lifting speed of the bobbin rail 14, and is proportional to the lifting speed when the capacity of the clutch is large. Since the ascending / descending speed of the bobbin rail 14 is controlled so as to decrease with an increase in the roving winding diameter, the overrun amount differs for each ascending / descending switching. However, since the change in the ascending / descending speed at each time is small, there is a problem even if the ascending / descending speed of the bobbin rail 14 at the time of the i-th ascending (or descending) and the (i + 1) th ascending (or descending) is regarded as the same. There is no. In addition, even if the bobbin rail 14 moves up and down at the same speed, the amount of overrun generally differs because the load is different when the bobbin rail 14 is raised and when it is lowered.

Therefore, in this embodiment, the amount of overrun is considered with respect to the target reversal position of the bobbin rail 14 from the i-th layer to the (i + 1) -th layer for roving winding forming set under the spinning conditions. When determining the switching timing of the electromagnetic clutches 27, 28, the overrun amount at the time of reversing the bobbin rail 14 two times before is used as the value of the overrun amount. When the target reversal position coordinates x (i) of the bobbin rail 14 are set in the reversing order of the bobbin rail 14, the odd-numbered reversal changes from up to down, and the even-numbered reversal changes from down to up, as shown in FIG. Will be the reversal of. That is, at the time of the odd-numbered reversal, the actual overrun amount at the time of the previous reversal from rising to falling is used. Further, at the time of even-numbered inversion, the actual overrun amount at the time of the previous inversion from the descending to the ascending is used.

As a result, as shown in FIG. 4, the set lift length is L ₀ , the shoulder angle of the roving winding is θ, and the increase amount of the roving winding diameter from the (n-1) th layer to the nth layer is Δφ ( n), the i-th
The target inversion position coordinate x (i) of the second time is expressed by the following equation. When i = 2n-1

[0018]

[Equation 1] When i = 2n

[0019]

[Equation 2] However, x (1) = 0 and x (2) = L ₀ . Therefore, the target inversion position coordinate x (2n−1) of the odd number is as follows.

X (1) = 0 x (3) = Δφ (3) cot θ x (5) = {Δφ (3) + Δφ (5)} cot θ: x (2n−1) = {Δφ (3) + Δφ (5) + ... Δφ (2n−1)} cot θ Further, the target inversion position coordinate x (2n) at the even number of times is as follows.

X (2) = L ₀ x (4) = L ₀ −Δφ (2) cot θ x (6) = L ₀ − {Δφ (2) + Δφ (4)} cot θ: x (2n) = L ₀ − {Δφ (2) + Δφ (4) + ... + Δφ (2n−2)} cot θ Also, the actual overrun amount at the i-th inversion is ΔL (i), which is the final value of the last spinning. Letting ΔLf be the actual overrun amount at the time of reversing, the clutch switching position coordinate X (i) at the i-th time of reversing is expressed by the following equation. When i = 2n-1 X (i) = x (2n-1) + [Delta] L (2n-3) ... (n = 2,3,4, ...) X (1) = x (1) +3 [Delta] Lf ... i = 2n When X (i) = x (2n) −ΔL (2n−2) ... (n = 2,3,4, ...) X (2) = x (2) −3ΔLf ... Clutch switching position coordinate X (i) When and are obtained by the equation, the overrun amount at the time of reversal from the first layer to the second layer and from the second layer to the third layer cannot be obtained in advance. Therefore, in this embodiment, the overrun amount at the first and second inversions is set to three times the overrun amount ΔLf at the final inversion at the previous spinning. The reason for setting it to 3 times is that the roving winding diameter when winding the final layer is almost 3 times the roving winding diameter when winding the first layer.
In addition, the increase amount Δφ (n) of the roving winding diameter from the (n−1) th layer to the nth layer can be obtained from the type of fiber, the gelen, and the twist number.

Next, the operation of the device configured as described above will be described. Prior to the operation of the machine stand, the spinning conditions such as fiber type, gelling, number of twists, bobbin diameter at the start of winding, predetermined winding amount up to full pipe (full pipe length), shoulder angle, etc. are input device 37. Enter by.

When the operation of the machine base is started, the flyer 11 is driven by the drive of the main motor M1 via the belt transmission mechanism 7, the driving shaft 4, the belt transmission mechanism 8, the rotating shaft 9, the driving gear 10 and the driven gear 12. Is driven to rotate,
Belt transmission mechanism 7, driving shaft 4, gear train 5
And the front roller 3 is rotationally driven via the belt transmission mechanism 6. Further, the rotational force of the main motor M1 input to the differential gear mechanism 17 and the rotational force of the winding motor M2 are combined by the differential gear mechanism 17, and the combined rotational force is transmitted to the rotary shaft 16. The bobbin wheel 13 on which the bobbin B is mounted is rotationally driven via the drive gear 15 and the driven gear 13a. As a result, the roving R drawn in the draft section 1 is twisted by the flyer 11 and the flyer 1
It is wound in layers on a bobbin B rotating at a higher speed than 1.
Further, the belt transmission mechanism 2 is driven by driving the lifting motor M3.
5, the bobbin rail 14 is moved up and down together with the lifter rack 22 via the gear train 26, the switching mechanism 29, the rotary shaft 24, and the pinion 23. The winding motor M2 and the lifting motor M3 are instructed by the control device 30 (CPU 35).
Rotation speed is changed, winding speed and bobbin rail 1
The lifting speed of 4 is changed.

Next, the up / down switching operation of the bobbin rail 14 will be described with reference to the flowchart of FIG. The CPU 35 inputs the output signal from the pulse encoder E3 at the same time when the operation of the roving frame is started, and starts the integration of the number of pulses thereof so that the position of the bobbin rail 14 can always be calculated. (Step S1, hereinafter the step will be referred to as S).

Next, the CPU 35 determines the next bobbin rail 14
Of the inversion number is determined based on the count value of the counter for counting the number of inversions, the first time, the second time, (2n
It is determined whether it is the +1) th time or the (2n + 2) th time (S2 to S4). If it is the first inversion, the next clutch switching position coordinate is calculated by the formula (S
5). Next, in S6, the CPU 35 determines the bobbin rail 1
The position of 4 is calculated as the position in the x coordinate shown in FIG. Since the position of the bobbin rail 14 at the start of operation is fixed, the position of the bobbin rail 14 is calculated from the moving amount of the bobbin rail 14, that is, the integrated value of the output pulse of the pulse encoder E3 and the x coordinate of the start position. Then, it is determined whether or not the position of the bobbin rail 14 has reached the clutch switching position coordinates calculated in S5, that is, the position where the switching command should be output (S7).

When the bobbin rail 14 reaches the position, the CPU 35 outputs a command signal for excitation or demagnetization to the electromagnetic clutches 27, 28 (S8). The CPU 35 outputs the command signal and at the same time calculates the integrated value of the number of pulses at that time and stores it in the working memory 38. Further, the excitation / demagnetization of the electromagnetic clutches 27 and 28 is switched by the command signal. After the command signal is output, the bobbin rail 14 moves in the same direction as before the switching of the excitation / demagnetization of the electromagnetic clutches 27 and 28 until the electromagnetic clutches 27 and 28 are completely disconnected / engaged. 14 is reversed. C
The PU 35 confirms the moving direction of the bobbin rail 14 based on the output signal from the pulse encoder E3, and after outputting the command signal, determines whether the bobbin rail 14 has been inverted (S9). Then, when the bobbin rail 14 is reversed, the CPU 35 adds 1 to the counter for counting the number of times of reversal (S10). Further, the CPU 35 is the bobbin rail 14
After the overrun amount is calculated from the integrated value of the pulse number when the pulse number is inverted and the integrated value of the pulse number when the command signal is output, the counter for counting the pulse number is reset (S11). Next, the CPU 35 judges whether or not the count value of the counter for counting the number of times of inversion has reached a predetermined set value, that is, the final number of times of inversion (S12), and if it has reached the predetermined set value, control for switching the bobbin rail 14 up and down. To finish. If it does not reach the predetermined set value, the process returns to S2.

At the time of the second reversal, the process proceeds from S2 to S3 and then to S13, and the next clutch switching position coordinate is calculated by the formula. Next, the process proceeds to S6, and the same operation as described above is performed to S12. Then, it returns to S2 again and S3
Then, in S4, it is judged whether or not it is the (2n + 1) th time, and the
If it is the (n + 1) th time, the next clutch switching position coordinate is calculated by the formula (S14). If it is the (2n + 2) th time, the next clutch switching position coordinate is calculated by the formula (S15). Next, the process proceeds to S6, and the same operation as described above is performed to S12. Hereinafter, similarly, the bobbin rail 14
If the number of reversals is an odd number, the next clutch switching position coordinate is calculated by an equation, and if it is an even number, the next clutch switching position coordinate is calculated, and the excitation / demagnetization switching of the electromagnetic clutches 27 and 28 is performed.

Even if the excitation / demagnetization of the electromagnetic clutches 27 and 28 is switched, the bobbin rail 14 is not reversed at the same time, but is reversed after moving the overrun amount corresponding to the ascending / descending speed of the bobbin rail 14. However, as described above, the electromagnetic clutches 27 and 28 are switched between the excitation and demagnetization at a position before the overrun amount obtained in advance at each inversion time, so that the actual inversion position is the desired roving winding shape. It is a predetermined reversal position for molding. Therefore, unlike the case where the switching signal of the electromagnetic clutch is output at the reverse position for forming the desired roving winding shape (shown in FIG. 5B),
As shown in (a), the roving winding shape according to the set conditions can be reliably formed, and the risk of shoulder collapse is eliminated. As a result, it is possible to reduce the inclination Θ of the shoulder Fa of the roving spool F and increase the roving winding amount.

If the bobbin rail 14 is reversed during acceleration / deceleration when a temporary stop and restart are performed during the inching operation or spinning operation, it is used for the next calculation of clutch position switching coordinates. The overrun amount ΔL during acceleration / deceleration is not used as the overrun amount ΔL. This is because the bobbin rail 14 moves up and down at a lower speed during such operation than during steady operation, so the overrun amount ΔL
Is smaller than that during steady operation. In such a case, the next overrun amount Δ before inching or acceleration / deceleration start is calculated for the calculation of the clutch position switching coordinates.
L is used. For example, when the reversal from the i-th layer to the (i + 1) th layer occurs during inching, the overrun amount used to calculate the clutch position switching coordinates when reversing from the (i + 2) th layer to the (i + 3) th layer is ΔL (i−2) is used.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, as the overrun amount used when calculating the clutch switching position coordinates, the overrun amount immediately before the rising time and the falling time is not distinguished. The overrun amount may be used, or the overrun amount at the time of reversal before several layers (5, 6 layers) may be used. Also, instead of using the overrun amount of several layers before, using the average value of the overrun amount from several layers before to immediately before, or instead of simply averaging, The overrun amount at the time of reversal may be obtained. Furthermore, the amount of overrun is measured at each reversal until the middle of winding, and thereafter the amount of overrun is not measured, but the amount of decrease in the overrun is linearly approximated based on the measured values up to that point. You may use it after asking for it. As the initial value before the actual value of the overrun amount was obtained, a value three times the overrun amount at the time of the final reversal at the previous spinning was used, but the initial value was obtained in advance regardless of the spinning conditions. Alternatively, it may be changed as appropriate such as a constant value.
Further, as a drive system of the roving frame, it is possible to adopt a configuration in which each drive unit is independently driven by a motor without providing the differential gear mechanism 17, or the motors M1, M2, M3 are driven at a variable speed through an inverter. Other variable speed motors such as servo motors may be used instead of the above motors. or,
Instead of detecting the position of the bobbin rail 14 based on the output signal of the pulse encoder E3, that is, the amount of rotation of the rotary shaft 24, a large number of permanent magnets alternate between their north and south poles in the vicinity of the ascending / descending range of the bobbin rail 14. A so-called magnet scale arranged in the above is arranged, and its detecting portion is fixed to the bobbin rail 14 so as to be movable integrally, and a detection signal of the detecting portion is input to the control device 30 to detect the position of the bobbin rail 14. You can Further, as the clutch, a clutch operated by fluid pressure such as hydraulic pressure or pneumatic pressure may be used instead of the electromagnetic clutch.

[0031]

As described above in detail, according to the present invention, there is a response delay from the output of the ascending / descending switching command to the completion of the disconnection / engagement of the clutch and the actual reversal of the bobbin rail. The roving winding of the desired shape can be reliably performed, and there is no risk of shoulder collapse. Further, since the clutch switching timing is set based on the response delay of the bobbin rail measured during spinning, it is possible to easily cope with changes in spinning conditions.

[Brief description of drawings]

FIG. 1 is a flowchart showing an up / down switching procedure.

FIG. 2 is a schematic diagram of a drive system of a roving frame.

FIG. 3 is a block diagram showing an electrical configuration of a control device.

FIG. 4 is a schematic diagram showing a relationship between a bobbin rail reversing position and a clutch switching position for forming a roving.

FIG. 5A is a diagram showing a relationship between a bobbin rail reversal position and an elevation switching signal output position in a roving wound by using the present invention, and FIG. 5B is a diagram corresponding to that in the conventional example. Is.

FIG. 6 is a time chart of a lifting / lowering operation of a bobbin rail of a conventional example.

[Explanation of symbols]

14 ... Bobbin rail, 22 ... Lifter rack, 23 ... Pinion, 26 ... Gear train, 27, 28 ... Electromagnetic clutch, 2
9 ... Lift switching mechanism, 30 ... Control device, 35 ... CPU, E
3 ... A pulse encoder as position detecting means, F ... roving spool, M3 ... lifting motor.

Claims (1)

[Claims] 1. A roving machine for switching up / down of a bobbin rail by disengagement / engagement of a clutch based on a command from a control device, wherein the bobbin rail position detection means always obtains the position of the bobbin rail, and the bobbin rail is moved up / down from the control device. Obtain the response delay amount from when the switching command is output until the bobbin rail is actually inverted, and calculate the subsequent response delay amount based on the response delay amount when the bobbin rail is inverted before the time when the lifting / lowering switching command is output. Then, when the bobbin rail reaches a position before the bobbin rail reversal position for forming the roving winding shape determined by the spinning condition, the position being in front by the calculated response delay amount, an up / down switching command is output. Method for switching bobbin rail up and down in roving frame.