JPH0258184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive control method for 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] In general, automatic winders use a drum drive to rotate the package while maintaining a constant slippage due to frictional contact between the drive surface and the circumferential surface of the package, and the package is guided by the drum groove to traverse left and right. The thread to be used is wound around the pack cage. and,
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 cage when the drum is started exceeds a certain amount, the winding cannot catch up, and the thread traversed by the drum becomes slack and ends up almost overlapping the center of the package. I'll get burned.

This phenomenon is not much of a problem when the winding speed is slow, but it becomes a problem when the winding speed exceeds 1000 m/min. This is especially a problem for those with

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

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-up of the drum so that the amount of sliding between the drum and the package is optimized. An object of the present invention is to provide a method for controlling the drive of a drum.

[Means for Solving the Problems] In the drum drive control method of the present invention, a drum starting curve that provides an optimum amount of slippage in accordance with the diameter of the package around which the 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. This is what I did.

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 slippage between the drum and the package is always maintained at an optimum level. For this reason, the package cage can always keep up with the drum, and there is no chance that the yarn will become slack due to the yarn being traversed by the drum due to the winding not being able to catch up, and the package will not be wound so that it overlaps the center of the package cage. .

[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.

1 is a drum, its driving surface and cradle 2
The package 3 is moved while maintaining a constant slip due to frictional contact with the peripheral surface of the package 3 supported by the package 3.
is rotated to wind the yarn, which is guided from the yarn feeding bobbin 4 through the yarn path into the drum groove 5 and traverses from side to side, onto the package cage 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: one is to calculate the package diameter by adding the winding thread length to the winding thread and winding conditions, and the other is to calculate the package diameter by adding the winding time to the winding thread and winding conditions. There are various methods such as calculating the diameter and detecting it by installing a diameter detection device on the cradle 2, but here we will use a package diameter detector 6 as shown in the figure to output an electrical signal according to the diameter of the package 3. Let's talk about when to do this.
Specifically, as shown in FIG. 2, a potentiometer 10 is attached on the extension of the cradle support shaft 2a (FIG. 2a), or a disk 11 is connected, and appropriate parts are attached to the outer periphery of this disk. Attach several photo sensors 12 (FIG. 2b). Alternatively, a proximity switch, encoder, or micro switch may be used, which continuously or intermittently removes the rotation of the cradle 2 due to changes in the package diameter from the cradle support shaft 2a, and adjusts the package diameter. To detect.

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

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 stores in its memory the optimum speed according to the package diameter. A drum starting curve for obtaining slippage is stored in advance. As shown in Figure 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)
b ₁ , b ₂ , b ₃ ). 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 starting curve stored in memory is for b ₁ with a small package diameter.
A ₁ is set, a ₂ is set for b ₂ of the package diameter, and a ₃ is set for b ₃ of the large package diameter, so that the steady yarn speed can be reached in the shortest time. Note that the memory is EPROM, which can be rewritten.
EEPROM etc. is suitable.

Next, when an inverter operation signal is given from the unit control device 7 to the motor variable speed device 8, the inverter applies V/f to the drum motor 9 so as to start the drum 1 according to the selected drum starting curve. Control the signal.

Upon receiving the V/f signal, the drum motor 9 rotates the drum 1 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 the preset starting curve, so even if the package diameter changes at the time of starting, the drum The slippage between the package cage and the package cage is maintained in an optimal state, and the slippage increases and the winding cannot catch up, and the yarn traversed by the drum becomes slack and becomes almost heavy in the center of the package cage. It won't get rolled up.

In the above embodiment, a method for detecting the package diameter has been described. Next, another method for detecting the package diameter will be described. FIG. 4 shows a second embodiment of the invention.

Reference numeral 20 denotes a drum rotation detector, which consists of a pick-up 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.

A yarn clearer 23 includes 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.

drum pulse output of the drum rotation detector 20;
The yarn running signal from the yarn clearer 23 is guided to the unit control device 7. In the unit control device 7, the above outputs and signals guided by this are
AND and count the AND output with a built-in counter to form a fixed length counter. The value of the constant length counter is the amount of yarn to be wound, so if you take into consideration the yarn to be wound and the winding conditions, i.e., the type of yarn (count, material), shape of the drum, contact pressure, tension, etc. The package diameter can be determined from the length. Note that the existing means for measuring the winding amount of yarn can be used as is.

The above conditions apply to each unit control device 7.
are connected by a communication line 26 and given by a master control 27 which is in charge.

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.

The two embodiments have been described above as being independent, but in some cases they may be of a combined type in which one embodiment is used for data evaluation of the other embodiment.

[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 optimum level.
It has the excellent effect of producing a high-quality package.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of a drum drive control device for explaining the drum drive control method according to the present invention, and FIG. 2 shows a specific example of the package diameter detector shown in FIG. 1. 3 is an explanatory diagram of a drum starting curve stored in the memory in the motor variable speed device shown in FIG. 1, and FIG. 4 is a diagram of a drum drive control device for explaining the method of the present invention. FIG. 2 is a configuration diagram showing a second embodiment. 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.

Claims (1)

[Claims] 1. Store in memory in advance a drum starting curve that provides the optimum amount of slip according to the package diameter, detect the diameter using the package diameter detection means, and then extract from the memory the drum starting curve that provides the optimum amount of slip that matches the detected diameter. A drum drive control method characterized in that the drum is read out and the drum is started according to the drum starting curve.