JP2003012228A - Reciprocal traverse device and reciprocal traversing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wind yarn while maintaining an acceleration/deceleration time and an acceleration/deceleration distance constant in an acceleration/deceleration range or keeping a change at a minimum, when the yarn is wound as maximum speed is changed in traverse stroke units. SOLUTION: This reciprocal traverse device T having a traverse motor 4 for reciprocating a traverse guide 9 includes a maximum frequency changing means 52 for changing the maximum frequency of the traverse motor 4 in each traverse stroke according to a preset rule, and a self-actuating frequency changing means 53 for changing a self-actuating frequency according to the change of the maximum frequency. To change maximum speed, the self- actuating frequency is changed so that an acceleration/deceleration distance and/or an acceleration/deceleration distance assume respective set values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward and reverse traverse apparatus and method for traversing a yarn by reciprocating a traverse guide while driving an electric motor forward and backward.

[0002]

2. Description of the Related Art Conventionally, for example, US Pat.
As shown in No. 12, an electric motor such as a stepping motor drives the drive pulley to rotate in the forward and reverse directions, and the belt mounted on the drive pulley is driven to rotate in the forward and reverse directions to reciprocate the traverse guide attached to the belt. There is known a forward / reverse traverse device that traverses a yarn. Each traverse stroke is divided into an acceleration / deceleration area at the traverse end and a constant speed area at the center of the traverse. In the acceleration / deceleration area, acceleration / deceleration is controlled so that the traverse speed (movement speed of the traverse guide) has a predetermined acceleration / deceleration pattern, and in the constant speed area, the traverse speed is controlled to be substantially constant.
Generally, in such a traverse, the traverse speed (maximum speed) in the constant speed region is periodically changed in traverse stroke units for the purpose of improving the winding shape (ribbon break, preventing ear height, etc.) ( Disturb), or the traverse stroke length (reciprocating distance of the traverse guide) is periodically changed (creeping) in traverse stroke units.

In the forward / reverse traverse device, the change in traverse speed with time has a pattern as shown in FIG. FIG. 11 shows one stroke of the traverse (one-way movement of the traverse guide) in the speed pattern of FIG. Next, a traverse speed pattern when the maximum speed is changed will be described with reference to FIG. In FIG. 11, the speed pattern P11 when the maximum speed is Vh11 and the maximum speed is Vh12 (Vh11 <
The velocity pattern in the case of Vh12) is also shown. Each speed pattern P11, P12 is composed of an acceleration region A11, A12 at one end of the traverse, a deceleration region D11, D12 at the other end of the traverse, and a constant velocity region C11, C12 between them. Composed.

A speed pattern P11 having a maximum speed of Vh11
Then, the acceleration time is Ta11, and the acceleration distance, which is the distance that the traverse guide moves within the acceleration time Ta11 in the acceleration region A11, corresponds to the area S1 in FIG. On the other hand, in the speed pattern P12 when the maximum speed is Vh12, the acceleration time is Ta12 (Ta11> Ta).
12), and the acceleration time Ta1 in the acceleration region A12
The acceleration distance, which is the distance that the traverse guide moves within 2, corresponds to the area S2. In FIG. 11, T11 and T12 are the times required for the traverse guide to move one stroke. Further, the deceleration time and the deceleration distance corresponding to the deceleration areas D11 and D12 are equal to the acceleration time and the acceleration distance corresponding to the acceleration areas A11 and A12, respectively.

[0005]

As an acceleration / deceleration control method for increasing / decreasing the maximum speed in the traverse stroke, for example, the acceleration / deceleration (the inclination in the acceleration / deceleration region in the speed pattern) is fixed and the acceleration / deceleration time is set. First to increase or decrease
Method, a second method of fixing acceleration / deceleration time to increase / decrease acceleration / deceleration, or a third method of increasing / decreasing both acceleration / deceleration and acceleration / deceleration time. The example shown in FIG. 11 corresponds to the third method.

In the first and second methods, the acceleration / deceleration distance changes when the maximum speed changes. This causes a situation in which the width of the portion where the yarn stays at the traverse end (the portion corresponding to the acceleration / deceleration region) changes significantly. As a result, the creeping amount (the amount by which the traverse width is narrowed relative to the maximum traverse width) must be changed significantly, and the change in density and hardness at the end (near the end face) of the winding package becomes large. However, there is a problem that unwinding and dyeing properties may be adversely affected. In addition, the acceleration / deceleration is fixed and the acceleration / deceleration time is increased / decreased.
In the case of the method, since the amount of change in the acceleration / deceleration time with respect to the change in the maximum speed becomes large, it is necessary to greatly change the ratio of the acceleration / deceleration time in the total time required for one stroke (one way) of the traverse. In addition, there is a problem that the amount of change in density and hardness at the end of the winding package becomes large, which may adversely affect unwinding property and dyeability.

In the case of the third method, the acceleration / deceleration distance can be kept constant even if the maximum speed changes. Explaining with reference to FIG. 11, even when the maximum speed is changed from Vh11 to Vh12, by changing the acceleration time from Ta11 to Ta12, the acceleration distance S11 in the speed pattern P11 and the acceleration distance S12 in the speed pattern P12 are changed. Can be equal. However, since the speed does not change at the start of acceleration (the first time point of the acceleration regions A11 and A12), in order to keep the acceleration distance constant (S11 = S12), the maximum speed is changed (Vh11 → Vh12). It is necessary to greatly change the acceleration time (Ta11 → T
There is a problem a12). This is the deceleration area D11,
The same applies to D12. Such a large change in the acceleration / deceleration time requires a large change in the creeping rate, as described above, and there is a problem that the amount of change in density or hardness at the end of the winding package becomes large. .

The present invention has been made in view of the above problems, and when performing winding while changing the maximum speed in traverse stroke units, while maintaining constant the acceleration / deceleration time and the acceleration / deceleration distance in the acceleration / deceleration region, or It is an object of the present invention to provide a forward / reverse traverse device and a forward / reverse traverse method capable of performing winding while maintaining a small change amount.

[0009]

In order to achieve the above object, the invention according to claim 1 is a forward / reverse traverse device equipped with an electric motor for reciprocating a traverse guide. It is characterized in that it comprises a maximum frequency changing means for changing the frequency and a self-starting frequency changing means for changing the self-starting frequency of the electric motor according to the change of the maximum frequency. In the present invention, the self-starting frequency changing means changes the self-starting frequency of the electric motor according to the change of the maximum frequency. Therefore, the acceleration / deceleration distance and the acceleration / deceleration time are maintained constant or the acceleration / deceleration distance and the acceleration / deceleration time are maintained. It is possible to traverse while suppressing the amount of change in

According to a second aspect of the present invention, the acceleration / deceleration distance setting means for setting the acceleration / deceleration distance (acceleration distance and / or deceleration distance) and the acceleration / deceleration time (acceleration time and / or deceleration time) are set. Acceleration / deceleration time setting means is provided, and the self-starting frequency changing means changes the self-starting frequency based on the set values of the acceleration / deceleration distance and the acceleration / deceleration time and the highest frequency. In the present invention, the self-starting frequency changing means changes the self-starting frequency based on the set value of the acceleration / deceleration distance and the acceleration / deceleration time and the highest frequency, so that the acceleration / deceleration distance and the acceleration / deceleration time are set as constant values. In this case, the traverse can be performed while keeping the acceleration / deceleration distance and the acceleration / deceleration time constant.

According to a third aspect of the present invention, the acceleration / deceleration distance setting means for setting the acceleration / deceleration distance (acceleration distance and / or deceleration distance) and the self-starting frequency setting for setting the self-starting frequency in association with the highest frequency. Means, and an acceleration / deceleration time calculation means for calculating the acceleration / deceleration time based on the set value of the acceleration / deceleration distance and the self-starting frequency and the highest frequency. In this invention, the self-starting frequency is set by the setting means in association with the highest frequency, and the acceleration / deceleration time calculating means calculates the acceleration / deceleration time based on the set value of the acceleration / deceleration distance and the self-starting frequency and the highest frequency. By setting the acceleration / deceleration distance as a constant value, the amount of change in the acceleration / deceleration time can be minimized while maintaining the acceleration / deceleration distance constant.

According to a fourth aspect of the present invention, in the forward / reverse traverse method in which the traverse guide is reciprocally moved while the electric motor is normally / reversely driven to traverse the yarn, the maximum frequency of the electric motor at each traverse stroke and self-starting. By changing the frequency, the traverse is performed while maintaining the acceleration / deceleration distance and the acceleration / deceleration time at the set values. According to the present invention, traverse control can be performed so as to maintain the acceleration / deceleration distance and the acceleration / deceleration time at appropriate values by changing the maximum frequency and the self-starting frequency of the electric motor in each traverse stroke.

According to a fifth aspect of the present invention, in the forward / reverse traverse method in which the traverse guide is reciprocated while the electric motor is normally / reversely driven to traverse the yarn, the maximum frequency of the electric motor in each traverse stroke is preset. It is characterized in that the self-starting frequency in each traverse stroke is changed in accordance with the change of the highest frequency while being changed according to the rule. According to the present invention, the maximum speed of the traverse guide in each traverse stroke is changed according to a preset rule, so that ribbon break and / or tension fluctuation can be effectively prevented. Also, by changing the self-starting frequency in each traverse stroke according to the change of the maximum frequency, while keeping the acceleration / deceleration distance and the acceleration / deceleration time constant, or minimizing the amount of change in the acceleration / deceleration distance and the acceleration / deceleration time. Traverse can be performed while suppressing.

According to a sixth aspect of the present invention, the self-starting frequency is changed while maintaining the acceleration / deceleration distance and the acceleration / deceleration time at the set values. In the present invention, if the acceleration / deceleration distance and the acceleration / deceleration time are set as constant values in advance, the traverse can be performed while maintaining the acceleration / deceleration distance and the acceleration / deceleration time constant. Further, if the acceleration / deceleration distance and / or the acceleration / deceleration time is set as a variation value within an allowable range instead of a constant value, that is, the acceleration / deceleration distance is changed according to a predetermined rule as the winding diameter increases. If the acceleration / deceleration time is set, the traverse can be performed while changing the acceleration / deceleration distance and / or the acceleration / deceleration time so as to reach the set value.

According to a seventh aspect of the present invention, the maximum frequency is increased or decreased periodically, the self-starting frequency is decreased as the maximum frequency increases, and the self-starting frequency is increased as the maximum frequency decreases. It is characterized by having done. In this invention, when the maximum frequency is increased, the self-starting frequency is decreased, and when the maximum frequency is decreased, the self-starting frequency is increased. Therefore, even when the maximum frequency changes, the acceleration / deceleration distance and the acceleration / deceleration time Both can be kept constant.

According to an eighth aspect of the present invention, the maximum frequency is periodically increased and decreased, the self-starting frequency is increased as the maximum frequency is increased, and the self-starting frequency is decreased as the maximum frequency is decreased. It is characterized by having done. In this invention, the self-starting frequency is increased when the maximum frequency is increased, and the self-starting frequency is decreased when the maximum frequency is decreased, so that either one of the acceleration / deceleration distance or the acceleration / deceleration time is kept constant. On the other hand, it is possible to traverse while changing the other within the allowable range.

[0017]

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments without departing from the gist of the present invention. 1 is a front view showing an outline of a yarn winding device including a traverse device according to the present embodiment, and FIG. 2 is a side view showing an outline of the yarn winding device of FIG. As shown in FIGS. 1 and 2, in a yarn winding device, a yarn Y is wound on a winding tube (bobbin) B held by bobbin holders 1, 1 while being traversed by a traverse device T. The winding package P is formed. The winding tube B (winding package P) comes into contact with the contact roller CR attached to the rotating shaft and is driven to rotate. The rotation shaft of the contact roller CR is rotationally driven by a drive motor (not shown). The contact roller CR rotates at a substantially constant speed during winding. The bobbin holders 1 and 1 are attached to cradle 2 and 2 which are swingable around a horizontal shaft 2a (axis parallel to the axis of the winding tube B and the contact roller CR). The cradle 2, 2 swings so that the bobbin holders 1, 1 (winding tube B) move away from the contact roller CR as the winding package P becomes thicker (the winding diameter increases). Although FIG. 1 shows an example in which the take-up tube B (the take-up package P) held so as to be freely rotatable is rotationally driven by the contact roller CR, the contact roller CR is so held as to be freely rotatable, The winding tube B (winding package P) may be rotationally driven by a drive motor.

The winding package P is formed by gradually reducing the traverse width (the length by which a traverse guide, which will be described later, reciprocates) as the winding thickness increases, and both end surfaces in the axial direction are tapered ends. It is the package P.
However, instead of the taper end package P, a yarn winding device that forms a cheese-shaped package having a cylindrical shape, a cone-shaped package P having a truncated cone shape, or the like is not excluded. Further, as the yarn Y, a filament yarn composed of filaments of synthetic fibers (polyester or the like) continuous in the longitudinal direction can be used. In the example of FIG.
It shows a false twisted yarn obtained by false twisting a multifilament yarn composed of a plurality of filaments such as polyester. The yarn winding device can also be used as a device for winding the spun yarn Y produced by twisting short fibers together.

The traverse device T is for traversing the traveling yarn Y in the axial direction of the winding tube B, and includes a drive belt body 3 and a traverse motor for driving the drive belt body 3 in forward and reverse directions. 4 and a control device 5 for controlling the rotational drive of the traverse motor 4. That is, the traverse device T is a forward / reverse traverse device that traverses the yarn Y by driving the traverse motor 4 as a drive source in the forward / reverse direction.

The drive belt body 3 formed in an endless loop shape has a plurality of (three in the example of FIG. 1) pulleys 6 to 6.
It has been passed over to 8. The pulley 6 is a drive pulley that is directly rotated by the traverse motor 4,
It is located in the center of the traverse area (traverse width). The pulleys 7 and 8 are driven pulleys that are driven to rotate by the driving of the drive belt body 3. One driven pulley 7 is located on one side of the traverse region, and the other driven pulley 8 is located on the other side of the traverse region. It is located in. That is, a space between the driven pulleys 7 and 8 is a traverse region which is a reciprocating range of the traverse guide 9 described later. In the example of FIG. 1, the three pulleys 6 to 8 are thus arranged so as to be located at the respective apexes of the triangle, and the pulleys 6 to 8 are hung so that the drive belt body 3 forms a triangular shape. It has been passed.

With the above-mentioned structure, when the traverse motor 4 drives the drive pulley 6 to rotate normally and reversely, the drive belt body 6 can be driven to travel normally and reversely. The drive belt body 6 includes a timing belt, a flat belt,
It is possible to use not only a belt such as a round belt but also a metal wire or the like. Further, as the traverse motor 4 which is an electric motor, a stepping motor capable of performing closed loop control of position and speed by switching the power supply by the control device 5 can be used. Further, instead of the stepping motor, an AC servo motor capable of closed-loop control of position and speed can be used.

Between the pulleys 7 and 8 of the drive belt body 3,
A traverse guide 9 for moving the engaged yarn Y is attached. Here, all parts that are attached to the drive belt body 3 and move integrally with the drive belt body 3 are defined as the traverse guide 9. Two pulleys 7,8
In the meantime, the drive belt body 3 extends in the axial direction of the winding tube B. The traverse motor 4 is provided with a rotation detector 10 such as an encoder, and its detection signal is input to the control device 5.

Guide detectors 11 and 12 for detecting passage or approach of the traverse guide 9 are arranged on both sides of the traverse area (maximum reciprocating range of the traverse guide 9). The guide detectors 11 and 12 are arranged outside the normal traverse area as end detection sensors, and when the traverse motor 9 is out of step or the drive pulley 6 and the drive belt body 3 are disengaged from each other, the traverse guide 9 is detected. Detects that has moved beyond the normal traverse range. When the movement of the traverse guide 9 which deviates from the normal range is detected by the guide detectors 11 and 12, the control device 5 immediately stops the rotational driving of the traverse motor 4. The guide detectors 11 and 12 are also used as position recognition sensors when the traverse guide 9 is moved to the origin. That is, the control device 5 detects the traverse guide 9 by one or both of the guide detectors 11 and 12 during the origin search operation, and then the traverse motor 4 is moved by a predetermined amount.
Is set as the origin, and during traverse operation, the traverse motor 4 is rotationally driven in a predetermined range based on the origin obtained during origin finding operation. The method of origin search operation is not limited to the method using the guide detectors 11 and 12 that detect the traverse guide 9, and resistance is given to the movement of the traverse guide 9 on both sides of the traverse area, resulting in a change in current. Alternatively, a sensorless method of detecting a pulse change can be adopted.

In the vicinity of one cradle 2, a winding tube B
A rotation detector 13 for detecting the rotation speed of is arranged. The rotation detector 13 outputs a pulse signal having a frequency corresponding to the rotation speed of the winding tube B located at the center of the winding package P as a rotation detection signal. The rotation detection signal of the rotation detector 13 is input to the control device 5.

Next, the function of the control device 5 and the traverse control will be described in more detail with reference to FIGS. still,
FIG. 3 is a functional block diagram showing the functions of the control device 5.
The control device 5 includes a central processing unit (CPU), ROM, RA
A microcomputer including M is provided, and a set value (parameter) required for traverse control can be input as serial data from an external control device. Further, the control device 5 can input operation signals (start signal, stop signal, origin return signal) from an external control device, and controls switching of the traverse operation according to the contents of the input operation signal. That is, the control device 5 starts the traverse operation when the start signal is input, and stops the traverse operation when the stop signal is input. Further, when the origin return signal is input, as described above, the guide detectors 11, 1 are
Perform home search operation using 2.

The control device 5 includes traverse control means 51.
A winding diameter calculation unit 55, a setting unit 56, and a motor driver (driving circuit) 60 are provided. The functions of the traverse control means 51, the winding diameter calculation means 55, and the setting means 60 are achieved by software in a microcomputer.

The motor driver 60 includes a microcomputer and a switching circuit (power circuit), and executes feedback control (closed loop control) of the traverse motor 4 based on the speed command signal (pulse command signal) a from the traverse control means 51. To do. This feedback function is achieved by software in the microcomputer of the motor driver 60. Further, the rotation detection signal of the rotation detector 10 is input to the motor driver 60, and the motor driver 60 causes the motor for traverse so that the detected speed and the detected position correspond to the speed command signal a from the traverse control means 51. Control 4 That is, the speed command signal a input to the motor driver 60
Includes the rotation amount and the rotation speed (moving distance and moving speed of the traverse guide 9) as parameters for the traverse motor 4, and the total number of pulses is the rotation amount (moving distance).
And the number of pulses per unit time corresponds to the rotation speed (moving speed). The motor driver 60 has an alarm detection function based on the rotation detection signal of the rotation detector 10. When the motor driver 60 detects an alarm during the traverse operation, it outputs the alarm signal b to the traverse control means 51 immediately. It has become.

The traverse control means 51 controls the traverse operation (rotation operation of the traverse motor 4), and the maximum frequency changing means (disturb executing means) 5
2, a self-starting frequency changing means 53, and a traverse width changing means 54.

During the traverse operation, the maximum frequency changing means 52 periodically changes (disturbs) the maximum frequency (constant speed frequency) in traverse stroke unit (traverse one-way moving unit) according to the winding diameter. By such a maximum frequency changing operation, it is possible to prevent ribbon winding in which the current winding yarn Y overlaps the already wound inner yarn Y to form a large strip-shaped convex portion. The highest frequency corresponds to the rotation speed of the traverse motor 4 (moving speed of the traverse guide 9) in the constant speed region in the center of the traverse range.

During the traverse operation, the self-starting frequency changing means 53 changes the self-starting frequency (acceleration start frequency, deceleration end frequency) in traverse stroke units according to the winding diameter. The self-starting frequency is an acceleration start frequency and a deceleration end frequency when the traverse motor 4 is reversed. That is, at the start of acceleration and the end of deceleration,
Command frequency (pulse frequency) by the pulse command signal a from the traverse control means 51 to the motor driver 60
Is a predetermined self-starting frequency between zero and the highest frequency.

The traverse width changing means 54 changes the traverse width (the reciprocating length of the traverse guide 9) in traverse stroke units according to the winding diameter during the traverse operation. The traverse width changing means 54 comprises creeping executing means and taper end forming means. The creeping execution means performs control so that a creeping operation is performed to periodically (regularly) increase or decrease the traverse width in accordance with the winding diameter to disperse the traverse turn position in the axial direction (traverse direction). By such a creeping operation, it is possible to prevent the occurrence of the height of the raised ear near the end surface of the winding package P. The taper end forming means controls the traverse turn position to gradually move inward as the winding diameter increases so that the traverse width becomes gradually narrower.

The winding diameter calculating means 55 calculates the current winding diameter (winding amount) based on the rotation detection signal from the rotation detector 13 for detecting the rotation speed of the winding tube B. That is,
The rotation detection signal of the rotation detector 13 is input to the winding diameter calculating means 55, and the winding diameter calculating means 55 calculates the current winding of the winding package P based on the rotation speed of the winding tube B and the peripheral speed of the contact roller CR. The diameter is constantly calculated during winding.

The setting means 56 sets the acceleration / deceleration distance setting means 57 in which the acceleration / deceleration distance (acceleration distance, deceleration distance) in the traverse operation and the acceleration / deceleration time (acceleration time, deceleration time) in the traverse operation are set. An acceleration / deceleration time setting means 58 and a maximum frequency increase / decrease setting means 59 in which parameters relating to increase / decrease of the maximum frequency in traverse operation are set. The acceleration / deceleration distance is the distance that the traverse guide 9 moves within the acceleration / deceleration time in the acceleration / deceleration area. The acceleration / deceleration time is the time required for the traverse guide 9 to move the acceleration / deceleration distance in the acceleration / deceleration area. The parameter relating to the increase / decrease in the maximum frequency is, for example, the increase / decrease amount and / or the increase / decrease period of periodic increase / decrease. still,
To set various setting values for the setting means 56, for example, the setting values are input to an external control device via input means such as a keyboard or a touch panel, and the setting values are transmitted to the control device 5 by serial communication. Can be done by

The traverse control means 51 controls the traverse operation based on the winding diameter calculated by the winding diameter calculating means 55 and the set value set by the setting means 56. Specifically, traverse control is performed as shown in FIGS. FIG. 4 is a diagram showing a first example of a change pattern of the traverse speed with respect to time, and FIG. 5 shows one stroke of the traverse (one-way movement of the traverse guide) in the speed pattern of FIG. FIG. 6 is a diagram showing periodic fluctuations of the maximum frequency and the self-starting frequency with respect to time, and FIG. 7 is a diagram showing a speed convergence state at the end of acceleration.

Forward / reverse traverse device T according to the present embodiment
In Fig. 4, the change in traverse speed over time is shown in Fig. 4.
The pattern is as shown in. In FIG. 4, assuming that the upper side of zero speed is the movement of the traverse guide 9 to the right, the lower side of the zero speed corresponds to the movement of the traverse guide 9 to the left. 4 and 5, the traverse speed pattern P1 when the maximum speed is Vh1 and the maximum speed is Vh1.
The traverse speed pattern P2 in the case of 2 (Vh2> Vh1) is shown in an overlapping manner. T1 and T2 are the time required for the traverse guide 9 to make one stroke (the time required to move from one end to the other end).
In the figure formed by the speed patterns P1 and P2, the area from time zero to time T1 and T2 corresponds to the movement distance of the traverse guide 9 for one stroke.

As shown in FIG. 5, each speed pattern P1,
P2 is the acceleration region A1, A2 at one end of the traverse and the deceleration region D at the other end of the traverse, respectively.
1, D2 and constant velocity regions C1 and C2 that are located between them and in which traverse is performed at a substantially constant velocity. In the speed pattern P1 when the maximum speed is Vh1,
The self-starting frequency is Vs1 and the acceleration time is Ta1, and the traverse guide 9 is set within the acceleration time Ta in the acceleration region A1.
The acceleration distance, which is the distance traveled by, corresponds to the area S1. That is, the acceleration distance in the speed pattern P1 can be obtained from the area S1 of the trapezoidal drawing in which the highest frequency Vh1 is the bottom side, the self-starting frequency Vs1 is the top side, and the acceleration time Ta1 is the height.

On the other hand, in the speed pattern P2 when the maximum speed is Vh2, the self-starting frequency is Vs2 (Vs2 <Vs
1), the acceleration time is Ta2 (Ta2 = Ta1), and the acceleration distance, which is the distance that the traverse guide 9 moves within the acceleration time Ta2 in the acceleration area A2, is the area S2 (S2 =
It corresponds to S1). Also in the case of the speed pattern P2, the acceleration distance can be similarly obtained from the area S2 of the trapezoidal figure. Since the speed pattern of one stroke is symmetrical from the center of the traverse, the deceleration area D
The self-starting frequency (deceleration end frequency), deceleration time, and deceleration distance of 1 and D2 are the same as in the acceleration regions A1 and A2. Therefore, in the following description, description of the deceleration regions D1 and D2 will be omitted, and only the acceleration regions A1 and A2 will be described.

In this embodiment, when the maximum speed is changed from the speed pattern P1 to the speed pattern P2, the self-starting frequency is changed from Vs1 to Vs2 in accordance with the change, whereby the acceleration distance S1 and the acceleration distance S2 are changed. And the acceleration time Ta1 are equal to the acceleration time Ta2. That is, by adjusting the self-starting frequency, the acceleration distance and the acceleration time are maintained constant even if the maximum speed changes (increases or decreases).

The self-starting frequency is changed by the self-starting frequency changing means 53 in the control device 5 according to the change in the maximum frequency. Specifically, the self-starting frequency changing means 53
When changing the maximum frequency, the acceleration / deceleration distance setting means 57
A new self-starting frequency is calculated based on the acceleration / deceleration distance (constant) set to, the acceleration / deceleration time (constant) set in the acceleration / deceleration time setting means 58, and the highest frequency. The traverse control means 51 uses the newly calculated self-starting frequency for traverse control.

In the examples of FIGS. 4 and 5, since the self-starting frequency for maintaining the acceleration distance and the acceleration time constant is calculated (S1 = S2, Ta1 = Ta2), the maximum frequency increases (Vh1 → Vh2). On the contrary, the self-starting frequency decreases (V
h1 → Vh2). On the contrary, when the maximum frequency is decreased, the self-starting frequency is increased. In this way, the acceleration distance and the acceleration time can be kept constant by increasing / decreasing the self-starting frequency as opposed to increasing / decreasing the maximum frequency. Further, even when only one of the acceleration distance and the acceleration time is kept constant, the change amount of the other can be reduced.

Maintaining the acceleration / deceleration distance constant or keeping the amount of change small means that the width (traverse direction length) of the portion where the yarn stays at the traverse end (the portion corresponding to the acceleration / deceleration region) changes substantially. Means not to.
Therefore, the change in creeping amount (the amount by which the turn position is moved inward with respect to the maximum traverse width) can be reduced, the change in yarn density and winding hardness at the end of the winding package P can be reduced, and the unwinding property can be improved. It is advantageous in that the dyeability is stable. Also, maintaining the acceleration / deceleration time constant or keeping the amount of change small can reduce the change in the proportion of the acceleration / deceleration time in the total time required for one stroke (one way) of the traverse, thereby reducing the end portion of the winding package P. This is advantageous in that the amount of change in yarn density and winding hardness at the time of is reduced, and the unwinding property and dyeing property are stabilized.

As shown by the solid line in FIG. 6, the maximum frequency is periodically changed as the winding time elapses. The periodical variation of the highest frequency is performed by the highest frequency changing means 52 in the traverse control means 51. Maximum frequency changing means 5
2 periodically changes the maximum frequency based on the set value (increase / decrease amount and increase / decrease cycle) set in the maximum frequency increase / decrease setting means 59.

Further, as shown by the chain double-dashed line in FIG. 6, the self-starting frequency fluctuates periodically as the winding time elapses. The periodic fluctuation of the self-starting frequency is performed by the self-starting frequency changing means 53 in the traverse control means 51. The self-starting frequency changing means 53 calculates the optimum self-starting frequency based on the instantaneous highest frequency and the set value in the setting means 56. That is, as described above, when the maximum speed is changed, the self-starting frequency that maintains both the acceleration / deceleration distance and the acceleration / deceleration time at the set value (constant) is calculated, and the calculated self-starting frequency is used. Acceleration / deceleration control of the traverse motor 4 is performed.

FIG. 7 shows the relationship between the actual rotation speed of the traverse motor 4 (moving speed of the traverse guide 9) and time. In the acceleration region, the motor 4 is gradually accelerated and is controlled to a constant speed rapidly at the moment of entering the constant velocity region. There is a stable region β. Therefore, in the present embodiment, as clearly shown in FIG. 5, in the speed patterns P1 and P2, the transition portions from the acceleration regions A1 and A2 to the constant speed regions C1 and C2 are curved. In this way, by smoothly changing the frequency when shifting from the acceleration region to the constant velocity region, the time corresponding to the velocity unstable region β until the actual velocity stabilizes (converges) immediately after the acceleration is finished. Can be shortened. Stabilizing the traverse speed by reducing the velocity unstable region β is very advantageous in forming the winding package P having a good package shape and a good unwinding property.

FIG. 8 shows a modification of the example of FIG. 5, in which the self-starting frequency is not decreased (Vs1 → Vs2), but the maximum frequency is increased (Vs1 → Vs2), contrary to the increase of the maximum frequency (Vh1 → Vh2). An example is shown in which the self-starting frequency is increased (Vs1 → Vs2) similarly to Vh1 → Vh2). In the case of the example of FIG. 8, the functional block diagram of the control device 5 is as shown in FIG.
Explaining only the parts different from FIG. 3, in FIG.
Instead of the acceleration / deceleration time setting means 57 of FIG. 3, a self-starting frequency setting means 61 is provided. Further, in FIG. 9, the traverse control means 51 further includes an acceleration / deceleration time calculation means 62.

In the self-starting frequency setting means 61, the self-starting frequency increasing / decreasing amount is set in association with the maximum frequency increasing / decreasing amount. Alternatively, the value of the self-starting frequency may be set in association with the value of the highest frequency. That is, when the maximum frequency is increased (decreased) by a certain amount, how much the self-starting frequency should be increased (decreased) is set. The acceleration / deceleration time calculation means 62 calculates a new acceleration / deceleration time based on the new maximum frequency, the new self-starting frequency, and the set acceleration / deceleration distance.

That is, in the examples shown in FIGS. 8 and 9, when changing the maximum frequency, the self-starting frequency changing means 53 sets a new self-starting frequency based on the set value set in the self-starting frequency setting means 61. calculate. Then, the acceleration / deceleration time calculation means 62 calculates the acceleration / deceleration time based on the highest frequency, the calculated self-starting frequency, and the acceleration / deceleration distance set in the acceleration / deceleration distance setting means 57. In the case of the examples of FIGS. 8 and 9, there is an acceleration time difference α between the speed pattern P1 and the speed pattern P2, but from the conventional example (FIG. 11) in which the self-starting frequency is not changed according to the change of the maximum frequency. However, the acceleration time difference α can be reduced.

As described above, the control device 5 controls the position and speed of the traverse guide 9 in each stroke of the traverse operation. In the present embodiment, the maximum frequency changing means 52 of the traverse control means 51 changes the maximum frequency of each stroke, and the self-starting frequency changing means 53 changes the self-starting frequency according to the change of the maximum frequency. Is characterized by. Therefore, even if the maximum frequency changes, the change in the acceleration / deceleration distance and the acceleration / deceleration time in the traverse operation can be kept to a minimum. By minimizing the amount of change in acceleration / deceleration distance and acceleration / deceleration time, the required creeping amount (the amount by which the turn position is moved inward with respect to the maximum traverse width) is made as uniform as possible, and the acceleration / deceleration time in the stroke is also increased. It is possible to form a winding package P having a uniform winding density and winding hardness at the end in the axial direction and having good unwinding property and dyeing property by making the ratio of the occupancy of the winding package P uniform.

[0049]

[Modification] In the embodiment, an example in which the acceleration / deceleration distance and the acceleration / deceleration time are kept constant (FIGS. 3 to 5) and an example in which the acceleration / deceleration time is appropriately calculated while keeping the acceleration / deceleration distance at a constant set value (FIGS. 8 and 9) has been described, the acceleration / deceleration time may be appropriately calculated while maintaining the acceleration / deceleration time at a constant set value. Further, both the acceleration / deceleration distance and the acceleration / deceleration time may be changed within the allowable range according to the change of the maximum frequency. Even in this case, the change amount of the acceleration / deceleration distance and the acceleration / deceleration time can be reduced by using the function of changing the self-starting frequency.

In the embodiment, the example in which the disturb is periodically (regularly) increased and decreased has been described. However, in order to prevent the tension fluctuation, the maximum frequency is gradually decreased as the winding diameter is increased. You can also In this case, the reduction rate of the highest frequency during winding thickening may be set in advance in the setting means 56, and the highest frequency may be gradually reduced according to the set rate. Even in this case, the self-starting frequency changing means 53 changes the self-starting frequency according to the change in the maximum frequency, and the acceleration / deceleration distance and the acceleration / deceleration time are always maintained at appropriate values.

[0051]

Since the present invention is constructed as described above,
The following effects are achieved. According to the present invention, in the control of the traverse guide in the traverse stroke, by changing the self-starting frequency which is the acceleration start frequency and / or the deceleration end frequency, the acceleration / deceleration distance and the acceleration / deceleration time can be set even if the maximum frequency changes. It is possible to wind the yarn while maintaining it constant or suppressing the amount of change to a minimum.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a yarn winding device including a traverse device according to an embodiment of the present invention.

FIG. 2 is a side view showing an outline of the yarn winding device of FIG.

FIG. 3 is a functional block diagram showing a functional configuration of the control device in FIG.

FIG. 4 is a diagram showing a relationship between traverse speed and time for the first example.

FIG. 5 is an enlarged view in which one stroke of FIG. 5 is enlarged.

FIG. 6 is a diagram showing variations in the maximum traverse speed and the self-starting speed with respect to time.

FIG. 7 is a diagram showing a speed convergence state at the end of acceleration.

FIG. 8 is a diagram showing one stroke of a relationship between traverse speed and time in a modified example.

9 is a functional block diagram showing a functional configuration of a control device in the case of the example of FIG.

FIG. 10 is a diagram showing a relationship between a conventional traverse speed and time.

FIG. 11 is an enlarged view in which one stroke of FIG. 10 is enlarged.

[Explanation of symbols]

B ... Winding tube (bobbin), CR ... Contact roller, P ... Winding package, T ... Traverse device, Y ... Yarn, 4 ... Traverse motor, 5 ... Control device, 9 ... Traverse guide,
10, 13 ... Rotation detector, 11, 12 ... Guide detector (end detection sensor), 51 ... Traverse control means, 52
... maximum frequency changing means (disturb executing means), 53
... self-starting frequency changing means, 54 ... traverse changing means,
55 ... Winding diameter calculation means, 56 ... Setting means, 57 ... Acceleration / deceleration distance setting means, 58 ... Acceleration / deceleration time setting means, 59 ... Maximum frequency increase / decrease setting means, 60 ... Motor driver (driving circuit), 61 ... Self-starting frequency Setting means, 62 ... Acceleration / deceleration time calculation means

Claims (8)

[Claims] 1. A forward / reverse traverse device including an electric motor that reciprocates a traverse guide, wherein maximum frequency changing means for changing the maximum frequency of the electric motor in each traverse stroke, and the electric motor according to the change of the maximum frequency. A forward / reverse traverse device, comprising: a self-starting frequency changing means for changing a self-starting frequency. 2. An acceleration / deceleration distance setting means for setting an acceleration / deceleration distance and an acceleration / deceleration time setting means for setting an acceleration / deceleration time, wherein the self-starting frequency changing means includes an acceleration / deceleration distance and an acceleration / deceleration time. The forward / reverse traverse device according to claim 1, wherein the self-starting frequency is changed based on the set value and the maximum frequency. 3. An acceleration / deceleration distance setting means in which an acceleration / deceleration distance is set, a self-starting frequency setting means in which a self-starting frequency is set in association with a maximum frequency, and set values of acceleration / deceleration distance and self-starting frequency and a maximum value. The forward / reverse traverse device according to claim 1, further comprising an acceleration / deceleration time calculating means for calculating the acceleration / deceleration time based on the frequency. 4. A forward / reverse traverse method of traversing a yarn by reciprocating a traverse guide while driving an electric motor forward / reverse by changing the maximum frequency and the self-starting frequency of the electric motor in each traverse stroke. , A forward / reverse traverse method characterized by performing traverse while maintaining the acceleration / deceleration distance and the acceleration / deceleration time at set values. 5. A forward / reverse traverse method in which a traverse guide is reciprocally moved while reciprocally driving an electric motor to traverse a yarn, and the maximum frequency of the electric motor in each traverse stroke is changed according to a preset rule. In addition, the forward / reverse traverse method is characterized in that the self-starting frequency in each traverse stroke is changed according to the change of the maximum frequency. 6. The forward / reverse traverse method according to claim 5, wherein the self-starting frequency is changed while maintaining the acceleration / deceleration distance and the acceleration / deceleration time at the set values. 7. The maximum frequency is periodically increased and decreased, the self-starting frequency is decreased with an increase in the maximum frequency, and the self-starting frequency is increased with a decrease in the maximum frequency. The reverse traverse method described. 8. The maximum frequency is periodically increased and decreased, the self-starting frequency is increased as the maximum frequency is increased, and the self-starting frequency is decreased as the maximum frequency is decreased. The reverse traverse method described.