JP2001302091A - Untwisting device and untwisting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and simple untwisting device and an untwisting method without providing a detector for detecting the winding diameter of a bobbin in an unreeling process for drawing material having differently shaped cross sections out of a package. SOLUTION: The device rotating a package in a direction to untwist the material when continuously drawing the long material such as string-like and tape-like material out of the package with the material wound around it in an axial direction of the package comprises a rotating mechanism; a setting/ indication means for inputting data on time and the number of rotation of the rotating mechanism in advance based on winding information on the package; a controlled variable generating means for automatically generating the controlled variable of the rotating mechanism based on the time and the number of rotation set in the setting/indication means; and a controlling means for controlling the rotating mechanism based on the controlled variable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for untwisting when a material is pulled out of a package in the axial direction of the package.

[0002]

2. Description of the Related Art Generally, a long material such as a filament, a tape yarn, an electric wire, and a steel material made of a synthetic resin is drawn out in an axial direction of a package fixed and stationary on a stand or a table. At this time, since the material is twisted once for each unwinding of one turn, the unwinding process is performed for a material having a so-called irregular cross-section such as a rectangular shape, a thin shape, and a flat shape that is not particularly circular in cross section. Inevitably, twisting occurs, resulting in a decrease in material strength, breakage, fluff, ironing, and other appearance quality deterioration. Conventionally, as a countermeasure as described above, JP-A-2-231371 discloses a displacement meter such as a photoelectric type that detects a winding diameter of a bobbin and generates a winding diameter signal, and uses a winding diameter signal from the displacement meter as an input to detect a winding diameter. A characteristic adjuster that generates a control signal based on the change characteristic, and a control signal from the control signal from the characteristic adjuster as an input, generates a drive signal having a rotation speed corresponding to a drawing speed of a material such as a yarn,
A device that changes the rotation speed of a rotation mechanism is disclosed.

[0003]

However, in the method of installing the above-described displacement meter and detecting the winding diameter, the winding diameter cannot be detected unless the relative position between the displacement meter and the bobbin is accurately defined. Therefore, a mechanically rugged construction such as a jig is required for stable mounting of the displacement gauge, which is complicated. Also,
When installing a displacement meter such as a photoelectric type at the site of a production factory or the like, the sensing unit becomes dirty with dust and oil, so periodic inspection, cleaning and calibration are required, which requires time and money. There was a problem of integrity. In addition, in order to detect the winding diameter with a high accuracy of about 2 mm or less, it is necessary to dispose the displacement meter close to the bobbin depending on the performance of the displacement meter, which causes a decrease in workability or a displacement due to a collision. It may cause a malfunction of the meter. Further, in the above-mentioned method, since one displacement meter is installed for each rotation mechanism, there is a problem that an ordinary production plant has a plurality of unwinding devices, and the equipment cost becomes extremely high. Furthermore, when a package without a bobbin is placed on a table and the material is pulled out from the inside in the axial direction (vertical direction), the winding diameter changes so as to increase the package inner diameter. There was a problem that the change could not be detected.

[0004] The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of unwinding a material having an irregular cross-section from a package without installing a detector for detecting the bobbin winding diameter. An object of the present invention is to provide an inexpensive and simple untwisting device and untwisting method. Still another object is to provide an apparatus and method capable of untwisting even when a package without a bobbin is placed on a table and a material is pulled out from the inside in the axial direction (vertical direction). Yet another object is to improve the performance of untwisting by detecting the degree of twisting and correcting the control amount that controls the rotation mechanism when shortage occurs in the process due to variations in material quality, etc. It is an object of the present invention to provide a device and a method capable of maintaining the above.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for extracting a material from a package in which a long material such as a thread or a tape is continuously wound in a package axial direction. In an apparatus for rotating a package in a direction to untwist a material, the rotation mechanism, setting display means for setting time and rotation number data of the rotation mechanism based on winding information of the package in advance, and setting with the setting display means A control amount generating unit for automatically generating a control amount of the rotation mechanism based on the time and the number of rotations, and a control unit for controlling the rotation mechanism based on the control amount. Further, the setting display means has a function of registering and selecting and setting a control pattern of the number of revolutions according to a temporal change in the winding diameter from the start of material withdrawal, and the control amount generating means sets the control pattern to an arbitrary one. A program operation function for controlling the number of rotations of the rotation mechanism by dividing into sections and linearly approximating the sections is provided. Further, the control amount generating means includes a detecting means for detecting the twist of the pulled-out material, and is capable of correcting the generated control amount when the twist is detected.

[0006]

According to the present invention, the number of rotations of the rotating mechanism for preventing twisting is determined in advance based on the package shape and dimensions and the line speed. Since there is a correlation between the winding diameter change characteristic and the material withdrawal time if the line speed is constant, a pattern for controlling the number of rotations of the rotating mechanism over time is also determined. Although this rotation speed control pattern is theoretically a curve, it is divided into arbitrary sections, linearly approximated by a regression equation, and registered in the control amount generation means via the setting display means. . Since the rotation speed control pattern changes depending on the package shape, dimensions and line speed, multiple registrations can be made.
When the operator operates the unwinding device, by selecting and setting a rotation speed control pattern according to the operating conditions on the setting display means, unwinding without twisting is possible.

The setting display means is preferably a device such as a touch panel or a panel computer in which the setting unit or the operation unit and the display unit are integrated, but the setting unit or the operation unit and the display unit such as a personal computer have a separate structure. It may be a device.

The control amount generating means is a control device having a numerical operation function such as a programmable controller, a panel computer, and a personal computer, but is not limited thereto.

In a package without a bobbin, the material can be placed on a table and pulled out from the inside (inner periphery) or the outside (outer periphery). Select whether to draw from inside or outside according to the type, material and cross-sectional shape of the material. On the other hand, in a package wound around a bobbin, the material is pulled out from the outside (outer periphery). In either case, the method of controlling the number of rotations is the same.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the untwisting device of the present invention will be described below. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

[First Embodiment] FIG. 1 shows a configuration of a untwisting device according to an embodiment of the present invention. The raw material 1 is wound as a cheese- or cone-shaped package 2 without a bobbin, placed on a table 3 at the time of unwinding, and pulled out from the inside at a constant speed in the axial direction. The table 3 is connected to a rotation mechanism 4 and is driven in a direction (opposite direction) to cancel the twist generated when the material 1 is pulled out. As a result, the draw-out (unwinding) point is fixed, and twisting does not occur.

The rotation speed of the rotation mechanism 4 is controlled by the control means 5. The rotation mechanism 4 is, for example, an induction motor, and the control means 5 is, for example, an inverter. However, as long as the rotation mechanism 4 can be controlled at a variable speed, the combination thereof may be a servo or other device.

For example, a voltage signal of 0 to 10 V DC or a current signal of 4 to 20 mA DC for a rotation speed of 0 to 120 r / m as a rotation speed command from the control amount generation means 6 or a communication means such as RS232C or the like. Given to. The control amount generating means 6 has a built-in memory for storing a rotational speed control pattern registered and set in advance.

The setting display means 7 has a screen for the operator to register and set a control pattern of the number of rotations with respect to time, and a screen for monitoring the operation state such as the start / stop operation of the motor or the number of rotations. Various data or signals are transmitted from the setting display unit 7 to the control amount generation unit 6 by a communication unit such as RS232C.

FIG. 2 shows the appearance of a package without a bobbin. (A) is a perspective view, (b) is a top view. Initial internal diameter (mm): D _O, internal diameter (mm): When D _i, D _i when pulling out the material from the inside of the package over time increases, the D _i when pulling out the material from the outside in the reverse time Become smaller. In this embodiment, 150 <D _i <2
70 (mm). Assuming that the package width (mm) is H and the number of winds (the number of rotations of the spindle in one way of the traverse) is W, the circumferential length (mm) is represented by the following equation from Pythagorean theorem. L = {(πD _i ) ² + (H / W) ² } Expression In this embodiment, H = 250 (mm) and W ≒ 4. In addition, the material drawing line speed (m / mi)
n): V, number of twists per unit time (turn / mi)
n): The following relational expression holds with n. n = V * 1000 / L Expression 1 Table 1 shows the calculation result of the number of twists n corresponding to the change in the inner diameter when the material is pulled out from the inside of the package using the expression and the expression. In this embodiment, V = 40 (m / min), and the number of twists for every 10 mm in inner diameter change is shown.

[0016]

[Table 1]

Therefore, if the table is rotated in the reverse direction at a rotation speed N (r / m) corresponding to the number of twists n with respect to the unwinding direction as shown in FIG. Is fixed,
No twisting will occur.

[0018] Figure 3 shows the control patterns of table rotation speed N (theoretical curves) with respect to a change in winding diameter D _i. in this case,
Winding diameter D _i is controlled to decrease gradually table rotational speed N in accordance with increase. On the other hand, package - if to draw material from the outside of the di-, and controls so as to increase gradually the table rotational speed N in accordance with the inner diameter D _i is reduced.

Next, since the control amount generation means 6 performs high-speed and high-precision digital processing, the control pattern (theoretical curve) shown in FIG. 3 is actually approximated by a plurality of broken lines. The larger the number of broken lines, the smaller the deviation (error), that is, the better the controllability. However, the program capacity and the memory capacity of the control amount generating means 6 also increase, which complicates the design and reduces the digital processing speed. Sometimes. In this embodiment, 3
Although the broken line approximation was adopted, the present invention is not limited to this. FIG. 4 shows a graph of the table rotation speed control by the three-fold line approximation of the present embodiment. Linear approximation is performed by a regression equation from the first section to the third section. Table 2 shows the deviation between the theoretical curve and the broken line approximation in this case.

[0020]

[Table 2] In this way, the rotation speed control with a sufficiently small deviation and high accuracy can be realized by the three-fold line approximation. Even if such a twist is involved, there is no problem in process and quality.

By the way, if the drawing line speed V is constant, there is a correlation between the inner diameter _Di and the material drawing time (min): T, and the control pattern of the table rotation speed with respect to time is similar to the curve shown in FIG. become. FIG. 5 shows the relationship between the pull-out time and the table rotation speed. Accordingly, the control amount generating means 6 controls the table rotation speed N with respect to the time T by approximating the table rotation speed N with a three-fold line.

FIG. 6 shows an actual method of controlling the table rotation speed program operation. Initial rotation speed: N ₀ , first section end rotation number: N ₁ , second section end rotation number: N ₂ , third section end rotation number: N ₃ , first section time: T ₁ , second section end time time:
A control pattern is registered in advance on the setting screen of the setting display means 7 as T ₂ , the time of the third section: T ₃ . The control amount generating means 6 receives the data of the set value of the control pattern and calculates and stores the deceleration rates α ₁ , α ₂ , α ₃ of each section according to the following equations. α ₁ = (N ₁ −N ₀ ) / T ₁ , α ₂ = (N ₂ −N ₁ ) / T ₂ , α ₃ = (N ₃ −N ₂ ) / T ₃ ,. Since the optimum control pattern differs depending on the drawing line speed, several tens of patterns can be registered. An operator selects a control pattern according to a material and operating conditions before starting operation.

The operation is started at the initial rotational speed N ₀ and the deceleration rate α ₁
To lower the number of revolutions. When the elapsed time T _1, automatically enters the second section switches to the deceleration rate alpha _2. Likewise, using the elapsed time T _2, the deceleration rate enters the third section becomes alpha _3.
If time or stop command is ON T _3, the program operation stop operation is reset.

Even if a trouble occurs in the process, such as when the material is cut off during drawing or when an external stop command is input, the control amount generating means 6 has a time setting value for each section, so it is treated as an interruption and set when restarting. The rotation speed can be controlled well according to the pattern.

Next, a method of detecting the twist of the drawn-out material and correcting the control amount generated will be described. If the quality of the material has a large variation, a slight twist may be generated when the above-described rotation speed control is performed. Therefore, a twist detecting means 9 is provided in a process after the unwinding process. The width of an irregular cross-section such as a yarn or tape is captured as a change in the amount of light received by a photoelectric sensor or the like. The control amount generating means 6 sets a logic circuit for determining how much the control amount is to be corrected based on the size of the twist and the time during which the twist continues in the process, and the presence or absence of the twist correction. FIG. 7 shows the relationship between the size of twist and the amount of control correction in this embodiment. In FIG. 7, the dead zone and the gain can be set arbitrarily. When the quality of the material is stable, it is not necessary to provide a twist detecting means and to use a method of detecting the twist and correcting the generated control amount.

[Embodiment 2] FIG. 8 shows a configuration of a untwisting device in the case of a package wound on a bobbin. Material 1
Is wound around the bobbin 8 as a cheese-like or cone-like package 2 and is drawn out at a constant speed in the axial direction of the bobbin 8. There are (a) horizontal insertion and (b) vertical insertion depending on the bobbin insertion direction.

The bobbin 8 is connected to the rotating mechanism 4, and the material 1 is pulled out from the outside of the package 2 and driven in a direction (an opposite direction) to cancel the twist due to unwinding.
Other configurations of the control unit 5, the control amount generation unit 6, the setting display unit 7, and the twist detection unit 9 are the same as those of the first embodiment.

[0028]

As described above, the untwisting device according to the present invention does not require the installation of a detector for detecting the bobbin winding diameter in the unwinding step of extracting the material having the irregular cross section from the package. Therefore, untwisting can be realized with an inexpensive and simple configuration. In addition, the device can be untwisted even when a package without a bobbin is placed on a table and the material is drawn out from the inside in the axial direction (vertical direction). In addition, it employs software-driven program operation, and has several tens of control patterns for differences in operating conditions such as differences in package shapes and line speeds, making it a stable production facility for factories. Can be used. Further, the number of approximate folding lines can be changed by software, and the maintainability and expandability are extremely high.

In addition, when unwinding packages of the same shape, it is possible to control the number of rotations of a plurality of tables or bobbins with one rotating mechanism, and to control a plurality of rotating mechanisms with one control amount generating means. Since it can be operated, equipment costs can be reduced.

In addition, when shortage of untwisting occurs in the process due to variations in material quality, etc., the twisting performance is corrected by detecting the degree of twisting and correcting the control amount for controlling the rotating mechanism. It is also possible to maintain.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a untwisting device according to Embodiment 1 of the present invention.

FIG. 2 shows the appearance of a package without a bobbin, (a)
Is a perspective view, and (b) is a top view.

3 is a diagram showing a control pattern of the table rotation speed N (theoretical curves) with respect to a change in winding diameter D _i.

FIG. 4 is a diagram showing table rotation speed control by three-fold line approximation.

FIG. 5 is a diagram illustrating a relationship between a drawing time and a table rotation speed.

FIG. 6 is a diagram showing an actual table rotation speed program operation control method.

FIG. 7 is a diagram illustrating a relationship between a twist size and a control correction amount in the embodiment.

FIG. 8 is a diagram showing a configuration of a untwisting device in the case of a package wound on a bobbin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material 2 Package 3 Table 4 Rotation mechanism 5 Control means 6 Control amount generation means 7 Setting display means 8 Bobbin 9 Twist detection means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F109 BA01 CA07 CA09 CA10 CB08 3F111 AB01 BA04 BC00 DA07 DA12 DA17 DD01

Claims (4)

[Claims] 1. An apparatus for rotating a package in a direction to untwist the material when the material is continuously drawn in a package axial direction from a package in which a long material such as a thread or a tape is continuously wound. A rotation mechanism, setting display means for setting the time and rotation number data of the rotation mechanism based on the winding information of the package in advance, and a control amount of the rotation mechanism based on the time and rotation number set by the setting display means. Characterized in that it comprises: a control amount generating means for automatically generating the control signal; and a control means for controlling the rotation mechanism based on the control amount. 2. The method according to claim 1, wherein the setting display unit has a function of registering and selecting and setting a control pattern of a number of revolutions according to a temporal change in winding diameter from the start of material withdrawal. 2. The untwisting device according to claim 1, further comprising a program operation function of dividing the number into arbitrary sections and linearly approximating the section to control the rotation speed of the rotation mechanism. 3. The method according to claim 1, wherein the control amount generation unit includes a detection unit that detects a twist of the pulled-out material, and when the twist is detected, the generated control amount can be corrected. The untwisting device according to claim 1 or 2. 4. A untwisting method, comprising using the untwisting device according to claim 1.