JP3238347B2 - Method of forming yarn feed pan for double twisting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a yarn feeder pan mounted on a spindle of a double twisting machine.

[0002]

2. Description of the Related Art In a double twisting machine, when a yarn is pulled out from a yarn feeder during twisting, the unwinding tension does not become excessive, and is kept as constant as possible throughout the entire period from the start to the end of yarn drawing. It is desirable to be maintained.

For this reason, a technique has been proposed in which fluctuations in the unwinding tension when the yarn is pulled out can be eliminated by the structure of the winding shape of the yarn feeding pan (Japanese Patent Laid-Open No. 4-20916).
No. 7).

According to this technique, an inner layer corresponding to approximately 1/4 to 1/2 of the total winding amount of the pirn shape is formed by feeling wind, and the upper end position of the traverse width when the inner layer is formed is a bobbin. The traverse is set so as to reach the upper end portion, and thereafter, the outer layer which is the remaining portion of the total winding amount of the pan is formed by performing a warp wind for sequentially reducing the traverse width at the end of the feeling wind.

[0005]

According to the prior art, since the upper end position of the traverse width has reached the upper end of the bobbin at the end of the formation of the inner layer, a number of unit yarn layers (half) forming the inner layer are formed. The wound yarn portion formed by the traverse) is present from the lower end to the vicinity of the upper end of the bobbin, or from the vicinity of the lower end to the upper end of the bobbin.

For this reason, when the yarn is pulled out from the outer layer, the unwinding tension is maintained at a small value, but when the yarn is drawn out from the inner layer, the unwinding tension becomes excessive.
This is because, in general, in a double twisting machine, the drawing speed of the yarn is slow due to the necessity of twisting, and the unwound yarn tends to contact the yarn layer without forming a balloon. When pulling out the yarn from the inner layer of the yarn feeding pan set in such a double twisting machine, the unit yarn layer of the inner layer is long in the axial direction of the bobbin in addition to the small winding diameter of the pan. This is because the yarn is pulled out while being in contact with the surface of the yarn layer while being wound several times.

Particularly, in the case of sublimated yarns such as composite processed yarns or special yarns which have been combined, the surface of the yarn layer is rough and the contact resistance with the yarns is high, so that the unwinding resistance is further increased when the yarn is pulled out from the inner layer. However, there was a problem that fluffing and yarn breakage occurred.

An object of the present invention is to provide a method for forming a yarn feeding pirn for a double twisting machine in which the unwinding tension during the yarn drawing is maintained at a low value over the entire period from the start to the end of the yarn drawing. I do.

[0009]

According to the present invention, there is provided a method for forming a yarn feeder for a double twisting machine, wherein an inner layer is formed by a feeling wind and an outer layer is formed by a warp wind. In the first half, the feeling wind has a region on the bobbin having a length equal to or less than half of the maximum winding width of the final winding shape as a base, and a part of an inclined portion on one end side of the bobbin in the final winding shape. Forming a first winding shape having a triangular cross section with the hypotenuse as a hypotenuse, and in the second half, setting a region on the bobbin excluding the bottom from the maximum winding width as a new bottom, and using the other hypotenuse of the triangle as a common hypotenuse The warp wind has a traverse width at the start of the warp wind that is the second half of the feeling wind. It is intended to sequentially reduced after being increased from traverse width to one end side of the bobbin.

In the feeling wind, specifically, in the first half, the turning position of one end of the bobbin of the traverse at the start of winding is moved to the other end of the bobbin by the width of the traverse at the start of winding. At the same time, the other end of the traverse bobbin at the start of winding is moved to approximately the middle of the bobbin, and in the second half, the other end of the traverse bobbin is turned over while maintaining the traverse width at the end of the first half. It has been moved to the other end.

In the first half, the winding position of the bobbin on one end side of the traverse at the start of winding is adjusted by the bobbin width at the start of winding while maintaining the traverse width at the start of winding. Traverse bobbin may be moved to the other end of the bobbin in the latter half while maintaining the traverse width.

[0012]

According to the present invention, in the first half of the feeling wind, the area on the bobbin having a length equal to or less than half of the maximum winding width of the final winding shape is set as the bottom side, and the one end side of the bobbin in the final winding shape is inclined. Since the first winding shape having a triangular cross section in which a part of the part is one oblique side is formed, the existence range of the unit yarn layer forming the first winding shape is at most half the maximum winding width. , Much shorter than for the inner layer of conventional yarn feeders.

Therefore, the unwinding tension at the time of pulling out the yarn from the yarn layer can be reduced accordingly.

Further, in the latter half of the feeling wind, a second section having a triangular cross section in which the area on the bobbin excluding the base from the maximum winding width is set as a new base and the other hypotenuse of the triangle is a common hypotenuse. Since the winding shape is formed, the second winding shape is formed by overlapping a plurality of unit yarn layers having a length corresponding to the length of the common hypotenuse in the axial direction of the bobbin.

Therefore, when the yarn is pulled out from the yarn layer, the yarn is pulled out in order from the other end portion of the bobbin, that is, the unit yarn layer on the surface located at the yarn drawing-out side end. Only the surface of the unit yarn layer comes into contact in a wound state, and the unwinding resistance decreases accordingly. Therefore, it is possible to perform drawing with a small unwinding tension.

While the yarn is being drawn from the yarn layer formed by the feeling wind, the yarn also comes into contact with the surface of the bobbin where the yarn layer does not exist, but the bobbin surface has a low contact resistance with the yarn. Since it is small, it does not cause a large increase in unwinding tension.

In the first half, for example, in the first half, the turning position of the traverse bobbin at the start of winding is moved by the traverse width at the start of winding, and the bobbin of the traverse at the start of winding is moved. The other end of the bobbin to the other end of the traverse while moving the traverse width at the end of the first half to the other end of the bobbin while maintaining the traverse width at the end of the first half. Can be moved.

If the inner layer is formed with such a feeling wind, the length of the yarn layer with which the yarn drawn from the inner layer comes into contact is at most about half that of the prior art. Therefore, the yarn can be pulled out from the inner layer without increasing the unwinding tension. Further, in the yarn layer formed in the latter half, the inclination angle (the angle formed between the yarn layer and the bobbin axis) of a number of unit yarn layers overlapping in the axial direction of the bobbin corresponds to the inclination of the unit yarn layer near one end of the bobbin. The larger the corner. Therefore, as the drawing proceeds, the contact length between the drawn yarn and the bobbin increases, but the inclination angle changes (increases) in the direction in which the unwinding property is improved, so that the unwinding tension is maintained at an appropriately constant value. Is done.

In the first half of the feeling wind, while the traverse width at the start of winding is maintained, the turning position of the traverse bobbin at one end side at the start of winding is adjusted by the traverse width at the start of winding. In the latter half, and in the latter half, the folded position of the other end of the bobbin of the traverse can be moved to the other end of the bobbin while maintaining the traverse width.

According to such a feeling wind, the length of the yarn layer contacted by the yarn drawn from the inner layer can be further reduced. In addition, in the yarn layer formed in the latter half, the inclination angles of a large number of unit yarn layers overlapping in the axial direction of the bobbin not only increase as the inclination angle of the unit yarn layer near one end of the bobbin, but also increase the inclination angle. Is higher, the unwinding property is further improved. It is particularly effective for yarns having a rough surface such as Nep yarns and slab yarns, and yarns having a lot of fluff such as spun-like yarns.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a cross-sectional view of a yarn layer of a yarn feeding pirn 30 formed in one embodiment of the present invention (cross-section in the direction of the bobbin) and the traverse position P when forming the yarn feeding pirn. Changes. At the time of forming the yarn feeding pan 30, the inner layer is formed by the feeling wind until the time T2 elapses from the start of winding, and thereafter, the outer layer is formed by the warp wind.

The time elapsed from the start of winding, that is, the relationship between the winding time T and the traverse position P will be described. At the start of winding (T = 0), the traverse position P0 is set to one of the traverse positions (lower side in the drawing).
A, and position P1 is the other (upper drawing) turnback position PB
And the traverse width is L0 (= position P2-position P1). As the winding time elapses, the two turning positions PA and PB move at the same speed in the axial direction of the bobbin 32, respectively. At this time, since the moving speed of the other turning position PB is higher than the moving speed of one turning position PA, the traverse width gradually increases. In FIG. 1, the inclination of each line indicating the locus of the turning positions PA and PB corresponds to the moving speed.

At the elapse of the winding time T1, the other turning position PB is slightly beyond the middle of the bobbin 32, and the traverse width has reached L1. As can be seen from FIG. 1, the traverse width L1 has a value smaller than 1/2 of the maximum winding width L in the winding shape when winding is completed, that is, the final winding shape.

Thus, the first half of the feeling wind is performed, and the yarn layer 40 having the volume V1 is formed. Thread layer 4
0, as shown in FIG. 2, a region on the bobbin 32 having a half of the maximum winding width L is defined as a base 44, and one end of the bobbin 32 in the final winding shape (the side from which the yarn is pulled out in the double twisting machine). The first winding shape has a triangular cross section in which a part of the inclined portion 47 on the side opposite to the inclined portion 47, specifically, a part of the ridge line of the inclined portion 47 is one oblique side 45.
The traverse width L0 at the start of winding and the taper angle φ
And the relationship with the length K45 of the hypotenuse 45 is L0 = K45
× cosφ.

After the elapse of the winding time T1, a further time (T2
Until -T1) has elapsed, the two return positions PA, P
B move at a constant speed in the axial direction of the bobbin 32 at the same speed. At this time, the traverse width is maintained at L1. In order to prevent the inclined portion 47 from being newly formed during this time,
The moving speed of the turning positions PA and PB is set to a value larger than the moving speed of the turning position PB in the first half.

When the winding time T2 is reached, one turning position PA reaches the position P3, and the other turning position PB reaches the other end of the bobbin 32, that is, the position P7.

Thus, the latter half of the feeling wind is performed, and the yarn layer 41 having the volume V2 is formed. Thread layer 4
1, a region on the bobbin 32 excluding the base 44 from the maximum winding width L is set as a new base 48, as shown in FIG.
It has a winding shape (second winding shape) having a triangular cross section in which the other hypotenuse 46 of the triangle is a common hypotenuse.

When a yarn layer formed by a half traverse (one reciprocation / 2) is defined as one unit yarn layer, each unit yarn layer exists over a length L1. A large number of unit yarn layers overlap in the axial direction of the bobbin 32 to form a yarn layer 41. The angle θA between the unit yarn layer closest to the other end of the bobbin 32 and the bobbin 32, that is, the inclination angle θA is set in the range of 6 to 9 degrees, and the unit yarn layer forming the yarn layer 41 The inclination angle of the unit yarn layer near the boundary with the yarn layer 40 is preferably set in the range of 12 to 18 degrees. At this time, the taper angle φ is set in the range of 16 degrees to 22 degrees. As an example, the inclination angle θA = 7 degrees, the inclination angle of the unit yarn layer near the boundary = 14 degrees, and the taper angle φ = 20 degrees.

After the elapse of the winding time T2, one of the turning positions PA of the traverse changes from the position P3 to the position P1. As a result, the traverse width temporarily increases from L1 to L2.

Thereafter, until the winding time T3 is reached, one of the turning positions PA moves at a constant speed from the position P1 to the position P2, and the other turning position PB moves from the position P7 to the position P.
It moves at a constant speed up to 6 and at a speed slightly higher than the speed of the turning position PA. Therefore, during this time, the traverse width gradually decreases from L2, and at the time of the winding time T3, L
It becomes 3.

Further, thereafter, the other turning position PB slightly increases the moving speed, and the one turning position PA sharply increases the moving speed. Thereby, the traverse width is sharply reduced from L3. When the time T4 corresponding to the total winding time has elapsed, one of the turning positions PA is shifted to the position P.
4 and the other turning position PB is shifted to the position P5.
And the traverse width becomes L4.

In this manner, warp winding is performed,
A thread layer 42 having a volume V3 and a thread layer 43 having a volume V4 are formed. The yarn layer 43 having the volume V4 is formed in order to make the final winding shape a trapezoidal cross section, and the temporal change in one of the traverse turning positions PA during this time is irregular. By making the final winding shape a trapezoidal cross section, the total winding length is increased.

FIG. 4 shows the cross section of the yarn layer of the yarn supplying pier 30 formed according to another embodiment of the present invention and the temporal change of the traverse position P when the yarn supplying pier is formed.

The traverse at the start of winding is shown in FIG.
Is the same as that shown in FIG. Thereafter, the two turning positions PA and PB move at the same speed and at the same speed in the axial direction of the bobbin 32 until the winding time T1 'is reached. Therefore, the traverse width during this period is maintained at L0.

Thus, the first half of the feeling wind is performed, and the yarn layer 50 having the volume V5 is formed. Thread layer 5
0 is a triangular cross section in which a region on the bobbin 32 that is about 1/5 of the maximum winding width L is the base 54, and a part of the inclined portion 57 on one end side of the bobbin 32 in the final winding shape is one oblique side 55. Winding shape (first winding shape).

After the elapse of the winding time T1 ', the two turning positions PA and PB both increase the moving speed and thereafter maintain the speed for a fixed time ΔT. Thereafter, the moving speed is further increased, and thereafter, the speed is maintained for a certain time ΔT. Such an operation is repeated until the winding time T2. When the winding time T2 is reached, one of the turning positions PA is at the position 6 and the other turning position PB is at the position 7
Reach Since the two turning positions PA and PB move at the same speed during this time, the traverse width is maintained at L0.

Thus, the latter half of the feeling wind is performed, and the yarn layer 51 having the volume V6 is formed. Thread layer 5
1 is a bobbin 3 excluding the bottom side 54 from the maximum winding width L.
The area on the top 2 is a new base 58, and has a winding shape (second winding shape) having a triangular cross section in which the other hypotenuse 56 of the triangle is a common hypotenuse.

Each of the multiple unit yarn layers forming the yarn layer 51 extends over a length L0. Further, similarly to the yarn layer 41 of the yarn feeding pan 30 shown in FIG. 1, the inclination angle of the unit yarn layer is larger as the inclination angle of the unit yarn layer located on one end side of the bobbin 32 is increased. However, the value of the inclination angle is generally larger than that shown in FIG.

When the winding time T2 has elapsed, one of the turning positions PA of the traverse changes from the position P6 to the position P1. As a result, the traverse width increases from L0 to L2.

Thereafter, the warp winding is performed until the winding time T4 is reached, the contents of which are the same as in the embodiment shown in FIG.

In the above two embodiments, the traverse width is kept constant during the period from the winding time T1 or T1 'to T2. However, since the second winding shape having the triangular cross section only needs to be formed during this time, the traverse width corresponding to the winding time can be freely set in relation to the moving speed of the turning position.

For example, the traverse width is gradually reduced in the course of performing the feeling wind, or the maintenance and the temporary reduction are temporarily mixed, and further, the maintenance, the reduction and the increase are temporarily performed. May be appropriately mixed.

The method for forming the yarn feeding pirn described above can be performed using the winding machine 1 shown in FIG.

For example, the winding machine 1 detects the winding time T every time a half traverse, that is, the end of the reciprocating forward or backward stroke, and detects the volume V of the yarn wound up to the winding time T.
(Hereinafter referred to as “winding volume V”) is calculated based on the information on the winding, and the traverse turning position PA or PB and the winding diameter dA or dB are obtained from the winding volume V.
Furthermore, the spindle speed n at which the yarn speed becomes v0 from the winding diameter
Is calculated, and the traverse and the spindle speed are controlled based on the obtained values.

FIG. 5 shows an outline of the winder 1.
The yarn 2 to be wound is guided by a yarn guide 3 from a yarn feeder (not shown), and is wound around the outer periphery of the bobbin 32. Here, the yarn guide 3 serves as a traverse drive device 5, a traverse motor 6, gears 7, 8,
The feed screw shaft 9 and the feed screw nut 10 reciprocate in parallel with the axial direction of the spindle 4. The spindle 4 is driven by the motor 12 of the spindle driving device 11 at the calculated spindle speed n.

A control device 13 is provided to drive these motors 6 and 12. Control device 1
Reference numeral 3 denotes a timer 15, a setting unit 16, an arithmetic circuit 14 connected thereto, a drive controller 17 for controlling the motor 6 by using traverse turnback positions PA and PB output from the arithmetic circuit 14, and an arithmetic circuit. The drive controller 18 controls the rotation of the motor 12 with the spindle speed n, which is the output of 14, as an input.

As shown in FIG. 6, the drive controller 17 comprises a command unit 19, a pulse generator 20, a polarity judgment unit 21, a deviation counter 22, a D / A converter 23, a drive circuit 24 and an encoder 25. ing.

As shown in FIG. 7, the drive controller 18 includes a D / A converter 26, an addition point 27, and a drive circuit 2.
8 and a tacho generator 29.

FIG. 8 shows a flow of the traverse control and the spindle rotation control. Before taking control
In the setting device 16, as the information on the winding, the total winding weight WM of the finally wound yarn, the winding density ρ (yarn weight / unit regarding the pirn at the time of winding the yarn) determined empirically in advance. The winding volume), the yarn unit weight D such as denier, the target yarn speed v0, and the diameter d of the bobbin 32 are input. Further, the setter 16 has two traverse turning positions PA and PB corresponding to the increase in the winding volume V.
And the diameter d of the yarn layer at both turnover positions PA and PB
A and dB are input as control data as shown in FIG.

When winding is started, a control operation is performed based on each step in FIG. When a winding start command is input to the arithmetic circuit 14 and the timer 15, the timer 15
Starts measuring the winding time T as the elapsed time from the start of winding. The arithmetic circuit 14 also starts the control operation based on the flowchart of FIG.

Immediately after the start of the control operation, the return positions PA0 and PB0 and the spindle speed n set in advance are set.
0 (= v0 / (π · d))
Commander 19 and D / A converter 26 of drive controller 18
Input.

The arithmetic circuit 14 receives the winding time T from the timer 15 and calculates the winding volume V. The winding volume V is calculated based on the following equation based on the winding time T and information on winding (winding density ρ, yarn unit weight D, yarn speed v0).

[0054]

(Equation 1)

Then, the turning position PA or PB corresponding to the calculated winding volume V and the winding diameter dA or dB corresponding to the turning position are calculated based on the control data.
For example, when the winding volume is V2, one of the turning positions P
A2 and the winding diameter dA2 are determined. Then, the spindle rotation speed n2 (= v0 / (π · dA) corresponding to the winding diameter dA2
2)) is calculated.

If a value equal to the calculated winding volume V is not set in the control data, the closest set winding volume is selected, and the corresponding turning position and winding diameter are specified. Good or calculated winding volume V
The optimum turning position and winding diameter may be obtained by interpolation calculation from each turning position and the winding diameter corresponding to the set winding volume before and after.

Thereafter, the arithmetic circuit 14 controls the drive control device 1
7 to wait for the input of the half traverse end signal e. As the half traverse signal e, for example, a signal corresponding to a deviation 0 from the deviation counter 22 which constitutes a part of the drive controller 17 is used. When the half traverse end signal e is input, the arithmetic circuit 14 outputs the turn-back position PA2 to the command device 19 of the drive control device 17 and outputs the spindle rotation speed n2 to the D / A converter 26 of the drive control device 18. . The output of the turn-back position PA2 to the command device 19 may be performed every time a predetermined minute time (for example, 0.5 seconds) elapses, instead of every time when the half-traverse end signal e is input. Good.

As will be described later, the drive controller 17 rotates the motor in the normal direction (however, at the turning positions PB1 to PB1) to move the yarn guide 3 to a position corresponding to the turning position PA2.
When PBn is output, the rotation is reversed). Further, the drive controller 18 controls the motor 1 based on the input spindle speed n2.
By rotating 2, the yarn is drawn from the yarn supplying body (not shown) at the yarn speed v0.

After outputting the turn-back position and the spindle rotation speed, the arithmetic circuit 14 calculates the winding time T as the total winding time TM.
Is determined, and if not, a new winding time T is input from the timer 15 again. The total winding time TH is calculated in advance based on the following equation based on the total winding weight WM, the yarn unit weight D, and the yarn speed v0.

[0060]

(Equation 2)

By repeating the above operation, in the course of the above operation, the inputted winding time T becomes the total winding time T
When M has been reached, the arithmetic circuit 14 ends the control operation,
A stop signal is output to each of the drive controllers 17 and 18.

Here, the functions of the drive controllers 17 and 18 will be described. In the command device 19, the rotation speed of the motor 6 corresponding to the traverse speed (the reciprocating speed of the yarn guide 3) is set. The command device 19 is provided with the arithmetic circuit 14
And outputs to the pulse generator 20 a command signal corresponding to the turning position and the set rotation speed of the motor 6 input from the controller.

The pulse generator 20 outputs a target rotation amount F0 and a rotation speed for driving the motor 6 to rotate as a pulse train signal based on the command signal. The pulse train signal gives the rotation amount of the motor 6 as the number of pulses and the rotation speed as the pulse frequency. Note that the target rotation amount F0
Is the rotation amount of the motor 6 for moving the yarn guide 3 to the turning position. This pulse train signal is transmitted to the motor 6
Is constituted by a two-phase pulse train in order to cope with the forward and reverse rotations of the motor 6, but instead is constituted by a single pulse train signal and a signal having another polarity corresponding to the rotation direction of the motor 6. Can also.

Each time the command signal is input from the command device 19, the pulse generator 20 inverts the polarity of the pulse train signal and outputs it. The polarity determiner 21 determines the rotation direction of the motor 6 based on the polarity of the pulse train signal, and outputs the target rotation amount F0 to the addition terminal of the deviation counter 22 for forward rotation and to the subtraction terminal for reverse rotation. Further, the polarity determiner 21 also applies a feedback signal Pf indicating the rotation amount of the motor 6 to the feedback signal Pf.
For example, the rotation direction of the motor 6 is determined from the two-phase pulse train signal constituting the signal.

The feedback signal Pf is input to the subtraction terminal of the deviation counter 22 if the rotation is forward, and to the addition terminal if the rotation is reverse. Therefore, the deviation counter 22 outputs a deviation between the target rotation amount F0 and the actual rotation amount Pf to the D / A converter 23 as a deviation signal. The deviation signal is
It is converted to an analog quantity and output to the drive circuit 24. Here, the drive circuit 24 inputs the analog signal and rotates the motor 6 at a predetermined speed until the deviation is eliminated.

As described above, when the drive controller 17 inputs the turn-back position from the arithmetic circuit 14, the drive controller 17
The motor 6 is rotated to move to the corresponding position. The arithmetic circuit 14 outputs a new turn-back position to the command device 19 each time the half traverse is completed, and the pulse generator 20 sets the new turn-back position when a command signal is input from the command device 19. The corresponding pulse train signal is output with its polarity inverted. Therefore, the motor 6 reverses every time the turn-back position is output from the arithmetic circuit 14, and reciprocates the yarn guide 3.

The drive controller 18 drives the motor 12 to rotate at the spindle speed n input from the arithmetic circuit 14. The spindle rotation speed n is input from a D / A converter 26 to a drive circuit 28 via an addition point 27. The drive circuit 28 rotates the motor 12 at a speed corresponding to the spindle speed n. The rotation speed of the motor 12 is
It is detected by the tacho generator 29 and given to the addition point 27 as a feedback signal. Note that an encoder may be provided instead of the tacho generator 29 to control the rotation speed under digital processing.

In the above control operation, for example, the spindle speed during the half traverse toward the turn-back position PA2 is set to n2. Instead, the spindle speed is changed to the spindle speed nAB based on the average winding diameter. May be rotated.

For example, the spindle rotation speed during the half traverse toward the turning position PA2 is (dB1 + d
Average winding diameter dAB corresponding to half traverse from A2) / 2
And nAB = v0 / (π · dAB) from the average winding diameter.

Further, instead of keeping the spindle speed during the half traverse constant, the current traverse position is detected from the encoder 25 during the half traverse, and the winding diameter corresponding to the traverse position that changes every moment is obtained. The spindle rotation speed may be sequentially calculated based on the winding diameter, and may be output to the D / A converter 26 each time it is calculated.

For example, if the vehicle is traversing toward one turn-back position PA2 and has moved from the other turn-back position PB1 to 1/3 of a half traverse distance, dB
If 1 <dA2, the winding diameter dAB at that position is dB
1+ (dA2-dB1) / 3. Therefore, the spindle speed nAB at that time is v0 / (π · dA
B).

If the traverse speed is controlled so as to be inversely proportional to the winding diameter, instead of keeping the traverse speed constant during winding, the helix angle becomes substantially constant, and a more stable winding layer can be formed.

When the winding condition such as the winding density ρ or the yarn unit weight D is changed while keeping the final winding shape constant, the rate of increase of the winding volume per unit time is proportional to the yarn unit weight D. Since it is inversely proportional to the winding density ρ, the total winding time TM similarly changes.

Further, instead of storing the traverse turning positions PA and PB corresponding to the winding volume V in advance as control data, the turning positions PA and PB corresponding to the winding time T are stored as control data. Alternatively, the traverse may be controlled while obtaining the turn-back positions PA and PB corresponding to the measured winding time T. In addition,
Since the winding volume V is proportional to the winding time T under a constant yarn speed, the control data in this case is substantially the same.

In addition, the folding position PA, which corresponds to the cross-sectional area in the bobbin axial direction of the winding shape (hereinafter referred to as “winding cross-sectional area”),
PB is stored as control data, and a winding cross-sectional area S is calculated based on a winding time T, information on winding, and a product R of the number of rotations of the spindle, and traverses while obtaining the corresponding turning positions PA and PB. You may make it control.

The winding cross-sectional area S can be considered that the area corresponding to the cross-sectional area of one thread increases each time the spindle makes one rotation, and is obtained based on the following equation.

[0077]

(Equation 3)

The product R of the number of rotations of the spindle may be detected by a measuring instrument, or calculated by the sum of the product of the number of rotations n of the spindle output as an instantaneous command position and the time of rotation at the number of rotations n. May be.

In the above control operation, the spindle speed was controlled so that the yarn speed becomes v0 from the winding diameter.
Instead, the spindle speed can be kept constant irrespective of the change in the winding diameter, and only the traverse can be controlled.

More specifically, the setting device 16 includes:
The turning positions PA and PB corresponding to the winding cross-sectional area S are input as control data for spindle rotation speed n0 and traverse control. The arithmetic circuit 14 includes the timer 1
5, the winding time T is input, the winding sectional area S is calculated based on the above equation, the corresponding turning position PA or PB is obtained, and the turning position PA or PB is input every time the half-traverse end signal e is input. Is output to the drive controller 17.
The product R of the number of spindle rotations is obtained by the product of the winding time T and the number of spindle rotations n0.

The control operation ends when the winding time T reaches the total winding time TM, as in the control operation described above. Here, the total winding time TM is the spindle rotation speed n0 and information on winding (winding density ρ, yarn unit weight D, total winding length Q, bobbin diameter d, final winding shape shown in FIG. The drawing width L, the final winding height h, the pull-out side taper angle θ, and the anti-pull-out side taper angle φ)) are calculated based on the following equation.

[0082]

(Equation 4)

In the above control operation, the turning position corresponding to the winding sectional area and the winding volume is stored as control data, and the turning position is determined based on the control data during winding. Instead of the information on the winding and the final winding shape, the first winding shape and the second
The dimensions of each triangle of the winding shape may be input in advance, and the winding position of the traverse may be sequentially calculated based on the mathematical expression based on the set value while detecting the winding time T.

For example, when the spindle speed n is controlled so that the yarn speed v0 is always maintained, the winding time T,
The winding volume V is determined from the yarn speed v0, the yarn unit weight D and the winding density ρ, and the final winding shape (maximum winding width L, final winding height h, pull-out side taper angle θ, The traverse turning position can be sequentially calculated based on the taper angle φ on the side opposite to the drawing side and the dimensions of the first winding shape and the second winding shape.

[0085]

According to the method for forming the yarn feeding pirn of the present invention, not only can the yarn be pulled out from the outer layer formed by the warp wind with a low unwinding tension, but also the lower yarn can be drawn from the inner layer formed by the feeling wind. Withdrawal can be performed with the tension applied. Therefore, since the unwinding tension during the drawing is kept at a low value and constant throughout the entire period from the start to the end of the drawing, it is possible to reliably prevent the occurrence of thread breakage and fluffing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a yarn feeding pan according to the present invention.

FIG. 2 is a longitudinal sectional view of a yarn feeding pan according to the present invention.

FIG. 3 is a vertical cross-sectional view of the yarn feeding pan according to the present invention.

FIG. 4 is a longitudinal sectional view of a yarn feeding pan of another embodiment.

FIG. 5 is a block diagram of a winding machine.

FIG. 6 is a block diagram of a drive controller.

FIG. 7 is a block diagram of a drive controller.

FIG. 8 is a flowchart of a control method.

FIG. 9 is an explanatory diagram of control data.

FIG. 10 is an explanatory diagram of a winding shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding machine 5 Traverse drive device 11 Spindle drive device 13 Control device 30 Yarn feed pan 32 Bobbin

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 54/02 B65H 54/28 B65H 55/04

Claims (3)

(57) [Claims] 1. A method for forming a yarn feeder for a double twisting machine, wherein an inner layer is formed by a feeling wind and an outer layer is formed by a warp wind, wherein the feeling wind has a maximum final winding shape in the first half thereof. Forming a first winding shape having a triangular cross section in which a region on the bobbin having a length equal to or less than half the winding width is a bottom side and a part of an inclined portion on one end side of the bobbin in the final winding shape is one oblique side. Then, in the second half, a second winding shape having a triangular cross section in which the area on the bobbin excluding the base from the maximum winding width is a new base and the other hypotenuse of the triangle is a common hypotenuse, The warp wind is sequentially reduced after increasing the traverse width at the start of the warp wind from the traverse width at the end of the latter half of the feeling wind to one end of the bobbin. A method for forming a yarn supplying bobbin for a double twisting machine, characterized by reducing the size. 2. In the first half, the feeling wind moves the traverse bobbin one end side turning position at the start of winding to the other end of the bobbin by the traverse width at the start of winding. Move the other end of the bobbin of the traverse to the middle of the bobbin at the start of taking, and in the second half, maintain the traverse width at the end of the first half while turning the other end of the bobbin of the traverse to the other end of the bobbin. The method for forming a yarn feeding pirn for a double twisting machine according to claim 1, wherein 3. In the first half of the feeling wind, while maintaining the traverse width at the start of winding, the winding position of the bobbin on one end side of the traverse at the start of winding is adjusted by the traverse width at the start of winding. 2. The double twisting machine according to claim 1, wherein, in the latter half, the other end of the bobbin of the traverse is moved to the other end of the bobbin while maintaining the traverse width. 3. Of forming a yarn feeding pan for use.