JPS63306163A - Control method for drive of drum - Google Patents

Abstract

PURPOSE:To keep the sliding quantity between a drum and a package always optimum by detecting a diameter with a package diameter detecting means, reading a drum starting curve for obtaining the optimum sliding quantity suited to this detected diameter from a memory, and starting a drum in accordance with this curve. CONSTITUTION:The starting and acceleration of a drum 1 is controlled in line with the diameter of a package 3. When the diameter of the package 3 is small, the rotating speed of the drum 1 is rapidly increased whereas, when the diameter of the package 3 is large, the rotating speed is gently increased. Thereby, the sliding quantity between the drum 1 and the package 3 is always kept in the optimum condition. Hence, the package 3 can always follow the drum 1 without causing the amount of yarn traversed by the drum 1 is loosened due to delay in winding up nor causing the yarn to be superposedly wound around the center part of the package 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the drive of a drum that rotates a package by frictional contact, and particularly to a method that improves the winding performance when the drum is started.

[Prior Art] Generally, in an automatic winder, the package is rotated by a drum drive while maintaining a constant slippage due to frictional contact between the drive surface and the circumferential surface of the package, and the thread is guided by the drum groove and traverses from side to side. is rolled up into a package. When thread breakage, bobbin change, etc. occur, the package drive drum is temporarily stopped, and when preparations are made, the drum is restarted to resume winding.

If the amount of slippage that occurs between the drum and the package when the drum is started is exceeded, the winding will not be able to catch up, and the thread traversed by the drum will become slack, and will end up overlapping the center of the package and winding. I'll get burned.

This phenomenon does not pose much of a problem when the winding speed is slow, but becomes a problem when the winding speed exceeds 1,00011/min. This is especially a problem with the more recent ones.

[Problems to be Solved by the Invention] As described above, the conventional products have the disadvantage that the phenomenon of yarn tangles and disturbance of the yarn layer on the package surface occurs when the drum is started. The reason for this is that although the slip increases in proportion to the package diameter when the drum start-up is constant, the lack of start-up control causes the drum to rotate rapidly regardless of the package diameter. As the speed increases, the amount of slippage between the drum and the package increases, making it difficult to keep up with the amount of package removal.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the prior art by taking the package diameter into consideration, and to accelerate the start of the drum so that the amount of sliding between the drum and the package is optimized. The purpose of the present invention is to provide a drive control method.

[Means for Solving the Problems] In the drum drive control method of the present invention, a drum starting curve that obtains the optimum amount of slip in accordance with the diameter of the package around which yarn is wound is stored in advance in a memory.

Then, the diameter is detected by the package diameter detecting means, a drum starting curve for obtaining the optimum amount of slip according to the detected diameter is read from the memory, and the drum is started according to this read drum starting curve. It is.

Here, the drum starting curve means a rising characteristic curve of drum rotation.

[Function] Startup and acceleration of the drum are controlled according to the diameter of the package. When the package diameter is small, the speed of the drum rotation increases rapidly, and when the package diameter is large, the speed increases gradually, so the amount of sliding between the drum and the package is always maintained at an optimal state. This allows the package to always keep up with the drum,
There is no slack in the yarn due to the yarn being traversed by the drum due to the winding not being able to catch up, and there is no possibility that the yarn will be wound overlapping the center of the package.

[Example] An example of the present invention will be described below based on FIGS. 1 to 4.

FIG. 1 shows a first embodiment of a drum drive control device in an automatic winder for explaining the drum drive control method of the present invention.

Reference numeral 1 denotes a drum, which rotates the package 3 while maintaining a constant sliding due to frictional contact between its driving surface and the peripheral surface of the package 3 supported by the cradle 2, and passes the yarn from the yarn feeding pobbin 4 through the yarn path to the drum. The thread that is guided by the groove 5 and traverses from side to side is wound around the package 3.

At startup, the drum 1 is controlled according to the diameter of the package 3. For this purpose, a package diameter detector 6, a unit control device 7, a motor variable speed device 8, and a drum motor 9 are provided.

First, there are two ways to detect the package diameter: ■ A method of calculating the package diameter by taking into account the length of the winding yarn, the winding yarn, and the winding conditions; ■ A method of calculating the package diameter by taking the winding time, the winding yarn, and the winding conditions into account. There are many ways to calculate the diameter, such as (1) installing a diameter detection device on the cradle 2 and detecting it, but here we will use the package diameter detector 6 (2) as shown in the figure to calculate the diameter according to the diameter of the package 3. We will now discuss the case of outputting an electrical signal.

Specifically, as shown in FIG. 2, the cradle support shaft 2a
You can install the potentiometer 10 on the extension of the
Figure (a)), the disks 11 are connected and an appropriate number of seven sensors 12 are attached to the outer periphery of this disk (Figure 2 (b)).
)do. Alternatively, a proximity switch, encoder, or microswitch may be used to detect the package diameter by continuously or intermittently picking up the rotation of the cradle 2 from the cradle support shaft 2a as the package diameter changes. .

The signal (digital or analog) detected by such a package diameter detector 6 is sent to a unit control device 7 provided in each unit of the automatic winder.
is input. The input signal is the unit control device [7
The current package diameter is calculated by the internal microprocessor. Based on this calculation result, a selection signal for the optimum drum starting curve is output digitally.

The motor variable speed device 8, which receives a selection signal from the unit control device 7 when the drum is started after a stop due to thread breakage, bobbin change, etc., is composed of an inverter, and its memory stores the optimum speed according to the package diameter. A drum starting curve for obtaining slippage is stored in advance. As shown in Fig. 3, the slippage between the drum 1 and the package 3 is as follows when the rising of the drum 1 is constant (solid line a).
increases in proportion to the diameter (small, medium, large) (dotted line b1.
bz, b3). Therefore, the activation and acceleration of the drum 1 is controlled in accordance with the diameter of the package 3 so that the slippage between the drum 1 and the package 3 falls within a normal winding range.

For example, the drum startup curve stored in the memory is set as al for bl with a small package diameter, al for bl with a medium package diameter, and a3 for b3 with a large package diameter, so that Allow the thread speed to reach a steady state. Note that the memory is rewritable EPROM,
There is an EEPROM.

Next, the inverter operation signal is transmitted to the unit control device [
7 to the motor variable speed device 8, the inverter controls the V/f signal given to the drum motor 9 so as to start the drum 1 according to the selected drum starting curve.

Upon receiving the V/f signal, the drum motor 9 rotates the drum 10 times as desired by belt transmission.

As described above, according to the above embodiment, the diameter is detected by the package diameter detector and the drum is started according to a preset starting curve, so even if the package diameter at startup varies, the drum and package The slip between the threads is maintained in an optimal state, and the slip increases and the winding cannot catch up, and the thread traversed by the drum becomes slack and is wound almost overlapping the center of the package. There is no need to put it away.

In the above embodiment, the method (2) was used as a means for detecting the package diameter. Next, method (2) will be described as another means for detecting the package diameter. Fourth
The figure shows a second embodiment according to the invention.

A drum rotation detector 20 includes a pickup wheel 21 provided on the drum shaft and a sensor 22 for detecting the number of the wheels, and outputs drum pulses proportional to the number of rotations of the drum.

Further, 23 is a yarn clearer, which is composed of a head sensor 24 that detects the presence or absence of yarn, and a yarn travel detector 25 that detects yarn travel based on a detection signal, and outputs a signal proportional to the yarn travel time. .

The drum pulse output of the drum rotation detector 20 and the yarn running signal of the yarn clearer 23 are guided to the unit control device 7. The unit control device 7 ANDs the above-mentioned output and the signal led thereto, and counts the AND output with a built-in counter to constitute a fixed length counter. The value of the constant length counter is the amount of yarn to be wound, so it is important to know the winding yarn and winding conditions, i.e., the type of yarn (count, material).
If the shape of the drum, contact pressure, tension, etc. are considered, the package diameter can be determined from the winding length.

Note that the existing means for measuring the winding amount of yarn can be used as is.

The above conditions are given by a master control 27 which connects each unit control device 7 with a communication line 26 and controls it.

According to this, there is no need to newly provide a detection means such as a package diameter detector as in the first embodiment, and there is an advantage that the existing line for measuring the winding amount can be used as is.

Although the two embodiments have been described above as being independent, a combination type may be used in which one embodiment is used for data evaluation of the other embodiment, depending on the case.

[Effects of the Invention] According to the present invention, since the activation of the drum is controlled according to the diameter of the package, the amount of sliding between the drum and the package is always maintained at an appropriate level, and a high-quality package can be obtained. Enhances excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a first embodiment of a drum drive control device for explaining a drum drive control method according to the present invention;
FIG. 2 is an explanatory diagram showing a specific example of the package diameter detector shown in FIG. Figure 4 shows the drive side of the drum to explain the method of the present invention! I
It is a block diagram which shows the second example of an actual journey of I' apparatus. In the figure, 1 is a drum, 3 is a package, 6 is a package diameter detector, and 8 is a motor variable speed device having a built-in memory for storing a drum starting curve. Patent Applicant Murata Machinery Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 1 Figure 3 (b) Figure 2

Claims (1)

[Claims] A drum starting curve for obtaining the optimum amount of slip according to the package diameter is stored in advance in the memory, the diameter is detected by the package diameter detection means, and a drum starting curve for obtaining the optimum amount of slip according to the detected diameter is stored in the memory. A drum drive control method characterized in that the drum is started according to the drum starting curve read from the drum starting curve.