JPH0348109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a yarn switching method for a turret type automatic winding device used in synthetic fiber manufacturing processes.

<Prior art> Two bobbin holders each connected to a drive motor are rotatably mounted on a turret table which has a rotation drive means and is rotatably supported.
The turret table is rotated at regular intervals by the winding control device so that the yarn is continuously wound up by the bobbins that are removably attached to the two bobbin holders, and the yarn is alternately and continuously wound. A turret type automatic winding device is known that detects the surface speed of a yarn package therein and controls the rotational speed of an electric motor that drives a bobbin holder during winding to keep the surface speed constant. .

In order to smoothly switch the thread, the waiting bobbin holder of such a turret-type automatic winding device has been started up before switching to increase the speed to near the running speed of the thread. Conventionally, there is no means to accurately determine this rotational speed, so it has not been possible to regulate the switching conditions due to variations in the rotational speed of the bobbin holder at each switching due to variations in the slip characteristics of the induction motor, bobbin holder bearing characteristics, etc. In other words, for example, in conventional calculations, even if the frequency was set to increase the speed of the bobbin by 0.7% higher than the normal thread speed at the time of thread switching, the actual rotational speed of the bobbin would be 0.8 to 0.2% higher due to the above-mentioned reasons. and variations,
Stable thread switching performance could not be obtained.

<Purpose of the invention> In such a conventional method, it is difficult to strictly control the rotational speed of the bobbin holder (bobbin) immediately after switching (at the beginning of winding), and if it is too fast, the thread switching will occur smoothly, but the thread quality of the innermost layer of the package cage will deteriorate. Since this would cause abnormalities, we had to go through a lot of trial and error, including sacrificing some switching performance and lowering the rotational speed a little. The present invention has been made to solve the problems of such conventional methods.

<Structure of the Invention> That is, the present invention includes two bobbin holders each connected to a drive motor, which are rotatably mounted on a turret table which has a rotational drive means and is rotatably supported. The table is rotated to alternately switch the bobbins inserted in the bobbin holder to continuously wind the yarn, and the surface speed of the yarn package during winding is detected and the speed is kept constant. In a switching method of a turret type automatic winding device, which controls the rotational speed of a motor that drives a bobbin holder during winding, a rotational speed control device is provided on the motor driving the bobbin holder during standby, and A means for detecting the rotation speed of the bobbin holder waiting at the position is provided, the waiting bobbin holder driving motor is started before the thread switching operation, and a rotation speed signal from the rotation speed detection means is fed back to the rotation speed control device. Then, the turret table is rotated while holding the drive signal of the drive motor at a stable value at the predetermined rotation speed, and after the thread switching operation is completed, the holding is released. This yarn switching method for a turret type automatic winding device is characterized in that a signal from a surface speed detection means is taken in, and the number of revolutions of a bobbin holder driving motor is controlled so that the signal is constant.

<Example> The present invention will be explained below based on the drawings. FIG. 1 is a schematic explanatory diagram of an apparatus for implementing the present invention.

In FIG. 1, reference numeral 1 denotes a turret table which is rotatably driven by an electric motor 2, and a rotating shaft 19 fixed at the center is rotatably supported by a winder frame (not shown). . Two bobbin holders 3, 3' are rotatably supported on one side of the turret table 1, and drive motors (induction motors in the embodiment) 4, 4' are fixed on the other side, and the bobbin holders 3, 3' are fixed to the other side. The holders 3, 3' are adapted to be driven by drive motors 4, 4', respectively. Reference numerals 5 and 5' denote power sources for the drive motors 4 and 4' (variable frequency power sources called inverters in the embodiment), and the drive motors 4 and 4' rotate around the rotating shaft 1a of the turret 1 when switching. Slip rings 6, 6' are provided at the ends of the rotating shaft 1a so that power can be supplied even during rotation.
Drive signals (power frequency) of power supplies 5, 5' are connected to drive motors 4, 4' via lines 6', respectively.

Reference numeral 7 denotes a bobbin called a contact roller, which is detachably attached to the bobbin holder 3 (not shown).
This is to detect the surface speed of the yarn package 3a wound on the yarn package and apply appropriate contact pressure to the yarn package to improve the winding appearance of the yarn package 3a. It is rotatably supported by a lifting device together with a traverse mechanism that provides a traverse motion, and as the yarn package 3a becomes thicker, it rises while in contact with the yarn package 3a. A gear 7a is provided at the shaft end of the contact roller 7 for rotation detection.
The surface velocity of the yarn package 3a is converted into electric pulses via an electromagnetic pick-up 8 provided on a winding frame (not shown) facing the yarn package, and the changeover switch 1
0 to the rotation speed control device 9, and the rotation speed control device 9 keeps the surface speed of the yarn package 3a constant (or in a specific pattern).
The drive signal of the power supply 5 is controlled so that

Reference numeral 11 outputs a switching signal from the winding control device, drives the electric motor 2, reverses the switching switch 10, switches the rotation speed detection signal to the bobbin holder 3' side that has been on standby, or rotates the turret table 1. Then, the bobbin holder 3' that is waiting is moved to the position of the bobbin holder 3 that is being wound, and furthermore, a switching signal is issued to start the electric motor 4' that drives the bobbin holder 3' that is waiting to maintain a constant speed. The speed increases, but conventionally, even though it is said to be at a constant speed, it only means that the frequency setting of the power supply 5 is kept constant, and not only is the frequency itself, which is the drive signal, not necessarily constant, but even if the frequency were to be constant. If the electric motor 4' is an induction motor, there will be slippage, and when the turret table 1 is actually rotated to perform a switching operation, the rotational speed of the bobbin holder 3' is not always constant, resulting in the above-mentioned problems. It was hot. In the present invention, the drive motor 4' of the bobbin holder 3' on standby is also provided with substantially the same power supply 5' and rotational speed control device 9' as in the case of the bobbin holder 3, and the bobbin holder drive motors 4, 4' are A rotation speed detection gear 4a at the shaft end,
A rotation speed detector (electromagnetic pick-up) 12 is mounted on the winding machine frame (not shown) facing the gears 4'a, 4a in order to detect the rotation speed of the bobbin holders 4', 4 in the standby position. The output signal of the rotation speed detector 12 is fed back to the rotation speed control device 9' via the changeover switch 10'. The changeover switch 10' is always controlled by the winding control device 11 so that the output of the rotation speed detector 12 is connected to the rotation speed control device 9' (or 9) of the bobbin holder 3' (or 3) on the standby side. Can be switched. In this configuration, the switching method of the present invention will be explained below with reference to FIG. 2. A indicates the surface speed of the yarn package during winding, B indicates the surface speed of the bobbin during standby, and the horizontal axis represents time (timing). However, point (a) is the point in time when a thread switching signal is generated from the winding control device 11, and the waiting bobbin holder 3' starts to be activated. Approximately 60 seconds later, at point (b), the bobbin holder 3' is rotated at a predetermined rotational speed (thread speed of 5000 m/min.
The surface speed of the bobbin (not shown) on the bobbin holder 3' is increased by 0.7% (corresponding rotational speed), and from this point (b), the rotation is fed back by the signal from the rotational speed detector 12 mentioned above. The speed is controlled to the predetermined speed by the numerical control device 9' at point (c) when a signal is output from the winding control device 11 after a certain period of time (approximately 5 seconds). At this point (c), the rotation speed control device 9' stops the feedback control and maintains the frequency output from the drive power source 5', and also reverses the changeover switches 10 and 10' to switch the turret table 1.
The bobbin holder 3' is rotated by the electric motor 2 and the waiting bobbin holder 3' is moved to the winding position. Approximately 3 seconds after this turret operation is completed, the yarn is transferred to the bobbin holder at point (d) just before point (e). The thread begins to be wound onto the bobbin above No. 3, and the actual thread switching is completed. The contact roller 7 comes into contact with the new bobbin on the bobbin holder 3 from point (e) when the turret operation is completed, and after a certain period of time (approximately 3 seconds), the contact roller 7 contacts the new bobbin (actually a little). Since this coincides with the circumferential speed of the thread (on which the thread is wound), the rotation speed controller 9' controls the winding speed to the normal winding speed while applying feedback from the signal from the rotation speed detector 8 from this point (f). The bobbin holder 3 on the side of the wound yarn package 3a is mechanically braked at a standby position (not shown).
Since it stops at (g), after stopping, the bobbin is replaced with an empty bobbin manually or by an automatic transfer, and then it waits.

<Effects of the Invention> As explained above, in the present invention, from point (c) where the turret starts to point (f) where feedback control is applied, the frequency of the bobbin holders 3' and 3 corresponds to the frequency maintained at point (c). Since it rotates at a substantially constant rotational speed, it is possible to maintain the predetermined rotational speed with much higher accuracy than in the past.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an apparatus for implementing the present invention;
FIG. 2 is a timing chart of the device shown in FIG. 1 at the time of thread switching. 1... Turret table, 3, 3'... Bobbin holder, 4, 4'... Electric motor, 5, 5'... Drive power supply, 7... Contact roller, 8... Rotation speed detector, 9, 9 '...Rotation speed control device, 11...
... Winding control device, 12... Rotation speed detector.

Claims (1)

[Claims] 1. Two bobbin holders each connected to a drive motor are rotatably mounted on a turret table which has a rotational drive means and is rotatably supported,
The turret table is rotated to alternately switch the bobbins inserted in the bobbin holder to continuously wind the yarn, and the surface speed of the yarn package during winding is detected and the winding is performed accordingly. In a switching method for a turret type automatic winding device that controls the rotational speed of an electric motor that drives a bobbin holder during winding in order to maintain a constant winding speed, a rotational speed control device is attached to the driving electric motor of a bobbin holder that is on standby. At the same time, a means for detecting the rotation speed of the bobbin holder waiting in the standby position is provided, and before the thread switching operation, the waiting bobbin holder driving motor is started, and the rotation speed signal from the rotation speed detection means is sent to the rotation speed control device. The turret table is rotated while the drive signal of the drive motor is maintained at a stable value at the predetermined rotation speed, and after the thread switching operation is completed, the holding is performed. 1. A thread switching method for a turret type automatic winding device, comprising: releasing a signal from a surface speed detecting means, and controlling the rotational speed of a bobbin holder drive motor so that the signal is constant.