JP3676911B2 - Winding control method of spindle type winding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a winding control method of a spindle type winder for winding synthetic fiber yarns such as polyester and nylon.
[0002]
[Prior art]
In the textile industry in recent years, there is a tendency to increase the speed and the number of spindles of the winder in order to improve productivity. In addition, in order to improve productivity, the size of the yarn package to be produced and the diameter of the bobbin have been reduced. In general, a bobbin holder with a bobbin is driven to form a wound body on the bobbin, and the peripheral speed of the contact roller pressed against the circumferential surface of the wound body is detected as the winding speed of the yarn. A spindle type winding method for controlling the number of rotations of the bobbin holder is commonly used. In this winding method, the bobbin holder speed on the empty side (winding start side) is set to be higher than the normal winding speed before switching for the purpose of preventing failure of the yarn switching due to a drop in tension at the time of switching. It is generally performed to increase the winding tension at the time of switching by increasing the speed somewhat.
[0003]
However, this method only considers ensuring the switching success rate, and results in an increase in the winding tension at the innermost layer portion of the wound yarn body formed on the empty bobbin after switching. For this reason, it is also the cause which causes the dyeing spot of the innermost layer part or the dyeing difference of the innermost layer part and the other site | part. Further, in the winding method, the contact roller has a slightly thicker diameter at the portion not in contact with the yarn so as not to damage the yarn in the bunch winding portion or the innermost layer yarn when in contact with the bobbin (this portion). Is hereinafter referred to as stepped). For this reason, an error occurs in the calculation of the winding speed that is performed based on the rotation speed of the contact roller and the diameter of the contact roller until the yarn fills the gap immediately after switching to the stepped portion. As a result, the calculation unit for the winding speed erroneously determines that it is slower than the actual winding speed. Based on this erroneous determination, the winding speed of the innermost layer is increased, The winding tension at the inner layer is to be increased.
[0004]
Furthermore, as a problem of the contact roller stepped portion, in the process in which the winding yarn is wound around the bobbin while being in contact with the surface of the contact roller, the stepped portion is wound until it is filled with the winding yarn. Occurs in some cases. That is, when the wound body forms the innermost layer portion, the contact roller rotates in contact with the bobbin at the stepped portion having a large diameter, so that the surface of the contact roller (the wound yarn other than the stepped portion) is rotated. The speed of the contact surface) is relatively lower than the bobbin speed. Accordingly, the yarn is stretched between the time when it comes into contact with the contact roller portion where the speed is reduced and the time when it is wound around the bobbin rotating at a speed higher than the speed. As a result, a further dyeing spot on the innermost layer part or a dyeing difference with a part other than the innermost layer part is increased.
[0005]
As a countermeasure against the change in the switching property or the change in the physical properties of the innermost layer portion due to the stepping of the contact roller, the following method is proposed in Japanese Patent Laid-Open No. 6-191723. That is, first, immediately after the switching operation, the contact roller is positioned so as not to contact the bobbin. After a predetermined amount of the thread layer is formed on the bobbin, the contact roller is moved so that the contact roller contacts the thread layer on the bobbin. Contact. At the same time, the rotational speed of the contact roller is controlled so that it is faster than the surface speed of the empty bobbin until it is switched to the empty bobbin side, and is substantially the same as or slower than the surface speed of the full bobbin. After switching to the empty bobbin, control is made so as to be substantially the same as the surface speed on the empty bobbin side.
[0006]
However, in this method, feedback control is employed in order to make the surface speed of the contact roller substantially the same as the winding speed after the yarn is caught by the empty bobbin. That is, this method employs a method of switching to feedback control based on the rotation number of the contact roller when the rotation speed changes due to contact with the contact roller in the spindle speed control. For this reason, in this system, it is impossible to make the contact roller speed control system simple open control, and an expensive control system must be adopted, which makes the winder expensive. There's a problem. Further, in such a control method, as a matter of course, when the contact roller comes into contact and shifts to the feedback control, the fluctuation of the contact roller due to the contact becomes a control deviation amount, and the spindle speed at the time of the control shift. Is associated with the problem of causing instability.
[0007]
[Problems to be solved by the invention]
In view of the above-described problems, the present invention aims to take up the winding tension of the innermost layer portion without adopting a complicated contact roller speed control system and even if the contact roller has a stepped portion. Can be controlled satisfactorily, thereby improving the thread switchability and the yarn physical properties of the innermost layer.
[0008]
[Means for Solving the Problems]
Here, according to the present invention,
A winding roller formed on a bobbin attached to a spindle-driven bobbin holder is brought into pressure contact with a drive roller that can be driven independently of the bobbin holder to detect the surface circumferential speed of the winding body, In the winding control method of the spindle type winder that controls the rotation speed of the bobbin holder so that the surface peripheral speed becomes a set value,
At the same time that the thread switching operation is started, the contact roller is driven at a speed faster than the winding speed in a non-contact state with the switched bobbin,
The bobbin holder speed control after the completion of thread switching is set as open control, and the rotation speed of the bobbin holder is decelerated stepwise or continuously.
The contact roller is brought into contact with a bobbin mounted on an open-controlled bobbin holder to detect a winding speed signal, and after the contact roller speed fluctuation converges within a preset fluctuation bandwidth and / or yarn A winding control method for a spindle type winding machine, wherein a winding speed of a bobbin holder that is being wound is feedback-controlled by a winding speed signal after a predetermined time has elapsed since completion of the changeover of a strip. Provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a control system illustrating the winding control method of the present invention.
[0010]
In the figure, the bobbin holder 1 is supported by a machine frame (not shown) of the winder. Further, a bobbin (not shown) is mounted on the bobbin holder 1, and a wound body 2 (hereinafter also referred to as “yarn package” or simply “package”) is provided on the bobbin. It is formed. Further, 3 is a contact roller, 4 is a pickup for detecting the number of rotations of the contact roller 3, 5 is a control device body, 6 and 8 are inverters, and 7 and 9 are motors.
[0011]
In the spindle type winder configured as described above, the winding speed is controlled as follows.
[0012]
That is, first, during winding which is pressed against the surface of the yarn package 2 and rotates, the number of rotations of the contact roller 3 rotating at a speed having some slip rate is detected by the pickup 4. The detected rotation speed signal of the contact roller 3 is taken into the control device body 5 as the current winding speed. Next, a speed command is issued from the control device main body 5 to the bobbin holder driving inverter 8 so that the winding speed at the time of loading coincides with the target winding speed set in the control device main body 5 in advance. The inverter 8 outputs a frequency in accordance with the speed command, thereby driving the bobbin holder driving motor 9 at a predetermined rotational speed.
[0013]
The control device main body 5 not only controls the bobbin holder 1 as described above, but also controls the traverse device that traverses the traveling yarn and controls the speed of the contact roller 3. The speed control of the contact roller 3 is performed by giving a preset speed command to the contact roller driving inverter 6 and driving the contact roller driving motor 9 at a frequency corresponding to the speed command by the inverter 6 . Is called.
[0014]
Here, the feature of the control method of the spindle type winder of the present invention will be described in detail with reference to FIG. In the figure, the lower graph represents the contact roller speed pattern during yarn switching, and the upper graph represents the speed command signal from the bobbin holder driving inverter 8 to the bobbin holder driving motor 9 . ing.
[0015]
In the winding control system according to the present invention, as shown in the lower graph of FIG. 2, one contact roller 3 is brought into a non-contact state with the switched bobbin at the same time as the yarn switching operation is started. Thus, the speed is increased to the speed set in the control device body 5 in advance. By this speed increase, the tension of the yarn traveling between the contact roller 3 from the yarn take-up roller (not shown), that is, the so-called winding tension is increased, and the switchability of the yarn is improved.
[0016]
The other bobbin holder 1 is also rotated at a speed set slightly higher than the target winding speed in order to improve the thread switchability until immediately before the thread switch. Here, in order to compensate for the innermost layer yarn quality of the wound yarn package, the speed command from the bobbin holder driving inverter 8 is targeted within T1 as short as possible from L1 immediately after the yarn switching. Step by step or continuously until the winding speed is reached. For example, this is done by stepwise or continuously returning the speed command from the bobbin holder driving inverter 8 to the target speed after a preset time T1 triggered by a limit switch L1 disposed on a turret table (not shown). Done.
[0017]
Thereafter, from the switching completion point L2, the bobbin holder driving motor 9 is driven at a speed programmed in the control device body 5 (for example, a speed having a speed gradient Vd calculated in advance for each brand as shown in the figure). Opening control is performed so that the winding speed of the yarn package mounted on the bobbin holder is decelerated continuously or stepwise. However, the deceleration at this time is set so as to compensate for the increase in the surface speed of the yarn package due to the thickening of the yarn. For this compensation, an optimum value may be appropriately selected depending on the brand of the yarn to be wound, the total denier, and the type of yarn (polyester, nylon, omnidirectional polyamide, etc.).
[0018]
Then, after winding a certain amount of yarn on the bobbin (to fill the stepped portion of the contact roller 3), after a preset time T2 with L2 as a trigger, that is, a timer with a preset contact time After the count-up, the contact roller 3 is brought into contact with the bobbin side whose rotational speed is regulated by open control.
[0019]
Here, the method of shifting the speed control of the bobbin holder from the open control to the feedback control based on the actual speed value of the contact roller 3 is performed after the speed fluctuation of the contact roller converges within the preset fluctuation bandwidth W1 (see FIG. Then, L2 is used as a trigger and after T3 time elapses. Alternatively, it is possible to shift from open control to feedback control after elapse of a preset time T4 using L2 as a trigger. In this case, however, the time T4 needs to be selected so that the speed fluctuation of the contact roller is sufficiently subsided within the fluctuation bandwidth W1.
[0020]
Then, after the winding tension of the innermost layer portion of the yarn package is finally controlled to be low by opening control as described above, the yarn package is wound by normal feedback control.
[0021]
In the method of the present invention, by adopting the above-described method, extremely stable control can be achieved without taking in as a control deviation a large speed fluctuation caused by contacting the contact roller 3 with the bobbin as in the conventional method. Is possible. Further, the control method of the present invention has no driving system for positively driving the contact roller, after completion of switching of the yarn, even immediately winder is brought into contact with the contact roller to the bobbin, a contact Needless to say, the unstable control by the stepped portion of the roller 3 can be improved.
[0022]
【The invention's effect】
According to the present invention described above, since the contact roller is at a speed somewhat higher than the target speed, the winding tension can be set somewhat higher, and the switchability can be secured. Further, during the formation of the innermost layer portion of the package, the bobbin holder is controlled to be open considering the winding thickness, and does not depend on the speed of the contact roller. Therefore, the winding tension of the yarn that is actually wound around the bobbin has an extremely remarkable effect that the innermost layer portion of the yarn package can be suppressed to a level that does not lighten or fluctuate in denier. Furthermore, when the innermost layer portion of the yarn package is formed, the contact roller is in a non-contact state with the bobbin, so that the contact roller stepped portion may or may not be provided. That is, regardless of whether the contact roller is stepped or not stepped, there is no relation to the yarn quality of the innermost layer portion of the obtained yarn package. Furthermore, the transition from the open control to the feedback control is not simultaneously with the contact roller being brought into contact with the bobbin, but can be arbitrarily changed by a timer, so that the speed fluctuation when the contact roller contacts can be taken in as a control deviation. It is possible to prevent and to shift to very stable feedback control.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a control system of a winder illustrating a winding control method of the present invention.
FIG. 2 is an explanatory diagram of a speed control system of the spindle type winder according to the present invention.
[Explanation of symbols]
1 Bobbin holder 2 Winding thread (yarn package)
3 Contact roller 5 Control body

Claims (2)

A winding roller formed on a bobbin attached to a spindle-driven bobbin holder is brought into pressure contact with a drive roller that can be driven independently of the bobbin holder to detect the surface circumferential speed of the winding body, In the winding control method of the spindle type winder that controls the rotation speed of the bobbin holder so that the surface peripheral speed becomes a set value,
At the same time that the thread switching operation is started, the contact roller is driven at a speed faster than the winding speed in a non-contact state with the switched bobbin,
The bobbin holder speed control after the completion of thread switching is set as open control, and the rotation speed of the bobbin holder is decelerated stepwise or continuously.
The contact roller is brought into contact with a bobbin mounted on an open-controlled bobbin holder to detect a winding speed signal, and after the contact roller speed fluctuation converges within a preset fluctuation bandwidth and / or yarn A winding control method for a spindle type winding machine, wherein a winding speed of a bobbin holder that is being wound is feedback-controlled by the winding speed signal after a predetermined time has elapsed after completion of the changeover of the strip. 2. The winding control method for a spindle type winding machine according to claim 1, wherein the contact roller is brought into contact with a bobbin mounted on a bobbin holder that is controlled to open after a timer whose contact time is set in advance is counted up.

Images