JPS6058268A - Motor controlling method of roller contact type liquid agent applying apparatus - Google Patents

Abstract

PURPOSE:To easily control the adhesion amount of a wax solution to a yarn in a stepless state, by controlling the rotary speed of a variable speed motor for driving a solvent coating roller in proportion to a sum signal obtained by adding a signal proportional to a yarn sheet speed and a predetermined value. CONSTITUTION:The upper surface of a coating roller 2 is brought into contact with a yarn sheet running at a constant speed on the way of running while the coated yarn sheet is wound up by a beam 14 through a guide roller 7. The roller 2 is contacted with a solvent, for example, a wax solution 3 at the lower surface thereof and connected to a variable speed motor 5 through a reduction gear 4. On the other hand, the output signal A of a taco-generator 8 connected to a roller 7 is applied to one voltage dividing variable resistor 9. Therefore, the signal A is converted to an output signal B by the arbitrarily alterable proportion constant of the resistor 9 to be outputted to an adding point 15. In addition, one terminal of the other variable resistor 10 is earthed and connected to the adding point 15 in order to impart an output signal C while a signal B proportional to the speed of the sheet 1 and the predetermined value signal C are further applied to the point 15 to obtain a sum signal D which is, in turn, sent to the next adding point 17 through a contact device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller contact type applicator for applying a liquid agent such as wax or a solvent, and particularly to control of the rotational speed of the applicator roller.

Conventionally, the rotation of the rollers in this type of device is controlled by connecting a mechanical drive shaft and the rollers via a reduction gear and a change gear, and rotating the rollers in proportion to the machine speed, that is, the yarn speed. , or by connecting a single motor to the roller and driving it at a constant rotation regardless of the speed of the machine.

With existing control methods, when changing the amount of wax, etc., the change is always done in stages, and requires time-consuming replacement of the engine. In order to perform such control, many gears are required, and a complicated operation is required to select the most appropriate gear from among them using a numerical table or the like.

In addition, in the latter control method, the control itself is stepless, but since the speed of the la machine, that is, the speed of the yarn, and the rotational speed of the roller are not related, when trying to obtain a constant amount of application, In response to changes in yarn speed, the rotation control of a single motor must also be changed each time. This means that the applied amount is not constant, especially during acceleration or deceleration.

Furthermore, both ministries have the following shortcomings:

In other words, the rotational speed of the rollers in this type of device is generally lr even when the thread speed is running at high speeds, e.g. 200 m/min.
The wax solution scooped up from the surface of the roller is subjected to a downward force on the surface of the roller due to the action of gravity, although it is extremely low at less than pm and depends on the viscosity of the wax solution. As the rotation of the roller becomes even more extremely low, the amount of wax solution reaching the top of the roller tends to decrease.

When the machine is operated at a low speed, for example, 10 m/7 min, especially for yarn processing, the number of rotations of the rollers is Q, lrpm.
This tendency becomes apparent as follows.

The present invention improves these drawbacks and makes it possible to easily and steplessly change the amount of wax solution applied to the yarn, and to maintain the amount of wax applied at a constant value even if the yarn speed is changed. The goal is to make it possible.

Of the two conventional methods, the present invention provides
It belongs to the latter category, that is, the single motor drive type.

That is, in the control method of the present invention, a variable speed motor whose rotational speed can be controlled is connected directly or via a reducer to a roller that applies a liquid agent such as wax, and the rotational speed of this variable speed motor is adjusted to the speed of the yarn sheet. A component proportional to and a predetermined value (
It is characterized in that it performs control in proportion to the sum signal obtained by adding a constant value). The rotational speed of the roller, that is, the variable speed motor, has a large proportion of the constant value in the region where the speed of the thread sheet is low, so that an appropriate rotational speed can be obtained and compensate for the decrease in the amount of wax scooped up to the upper part of the roller. In addition, in a region where the speed of the yarn sheet is high, the ratio of the above constant value is small and is proportional to the speed of the yarn sheet 1-. Here, the above-mentioned predetermined value, that is, the constant value, is determined in relation to the surface speed of the roller and the static falling speed of the workpiece solution, etc. on the roller surface. The present invention is also characterized in that it provides an effective method for setting this value. In this way, even if the speed of the thread changes, the lifting of the wax solution to the top of the roller can be set to a substantially constant amount.

The relationship between the yarn speed and roller rotation speed will be described in detail later with reference to FIG. 2, but y = a x 4- b
It is expressed by the graphical formula of

On the other hand, the application of the wax solution requires that the thread sheet be attached to the position where it contacts the surface of the roller, that is, the upper surface of the roller. However, when the wax solution is supplied for the first time or after the roller is stopped for a long time, the wax solution on the roller surface descends due to gravity, and almost no wax solution adheres to the roller. Therefore, before starting work, it is necessary to rotate the roller at least half a turn to apply the wax solution to the surface of the roller.

For this reason, conventional devices have a structure in which a mechanical latch is provided between the roller and the speed reducer, etc., so that the drive section and the roller are once disconnected, and the roller is manually rotated.

The present invention enables the variable speed motor to be started and stopped by a push button or switch while the thread is not running;
Encourage the rotation of the rollers to quickly prepare for work, and use a timer to automatically rotate the rollers about half a turn when starting up after a long stop to remove excess wax from the rollers. Complete the preparation without adhesion.
I'm trying to get along.

Hereinafter, the structure and operation of the present invention will be specifically explained based on an embodiment shown in the drawings.

First, FIG. 1 shows an overview of the control system. Thread sheet 1
The beam 14 is traveling at a constant speed, touches the top surface of the coating roller 2 on the way, and passes through a guide roller.
It is being wound up. The roller 2 has a cylindrical shape,
It is in a horizontal state, so that its lower surface is in contact with a liquid agent, such as a wax solution 3, and is connected to a variable speed motor 5 via a reduction gear 1a4. On the other hand, a tachometer generator 8 is connected to the guide roll 7, and its output signal A is applied to one end of one voltage dividing variable resistor 9. Therefore, this output signal A becomes an output signal B according to an arbitrarily changeable proportionality constant of the variable resistor 9, and is outputted to the summing point 15. The other variable resistor 10 is grounded at one end and receives a constant voltage V at the other end, and its movable end is connected to the summing point 15 to provide an output signal C. In this way, the output signal B proportional to the speed of the yarn sheet 1 and the output signal C of a predetermined value are applied to the addition point 15, which becomes a sum signal and passes through the contactor 11 to the next addition point 1G.
sent to. Here, the contactor 11 is closed only while the yarn sheet 1 is running. Therefore, the sum signal is sent as a speed command signal to the control amplifier 6 of the variable speed motor 5 via the summing point 16 only during the running of the yarn sheet I.

On the other hand, this variable speed motor 5 has a tacho generator 12.
The output signal E thereof is negatively fed back to the summing point 16 on the input side of the control amplifier 6, and acts as a feed bank signal for the variable speed motor 5. In this way, the rotation speed of the variable speed motor 5 is controlled to a target speed value in proportion to the speed command signal, that is, the sum signal. Note that the contactor 11 is opened and closed by detecting the voltage level of the output signal A. Alternatively, the output signal A may be a voltage for commanding the speed of the yarn, such as a command voltage of a yarn sheet driving motor, without being detected from the Shita cogenerec 8.

Since the control system is as described above, the rotational speed V of the roller 2
a is the general graph formula y=ax, as shown in Figure 2.
From the graph of +b, if the thread speed dust is shifted from vb, then V a =
It becomes K・vb+b. Here, if the contactor 11 is always closed, the rotational speed Va of the roller 2 is the straight line b-a
However, when the yarn speed dust vb is 0, it is inconvenient if the roller 2 rotates, so when the yarn speed dust vb is almost 0, the contactor 11 changes according to the sum signal signal. Turn off the input and stop the rotation of roller 2. As a result, the rotational speed Va of the roller 2 is determined by the straight line 0b-
It is set to follow the order of a.

In the graph of FIG. 2, changing the coefficient of the variable resistor 9 corresponds to changing the slope of the straight line a-b, that is, the B1 number K in the above equation, and also changing the coefficient of the variable resistor 10. The change is the length of the straight line ob, that is, the output signal C
This corresponds to adjusting the level of

Next, Fig. 3 shows the yarn speed dust vb and the rotational speed Va of roller 2.
The relationship with the time axis is shown above. Now, as will be described in detail later, in relation to the falling speed of the wax solvent, after adjusting n; ba, yarn velocity dust vb
Not only can you change the amount, but you can also receive a certain amount even when accelerating or decelerating. Furthermore, in controlling the speed of the variable speed motor 5, in the conventional control method, proportional control may not be maintained in the low rotation range, but with the control method of the present invention, such characteristics can be corrected.

Furthermore, if the push button switch 13 is turned on before starting operation after the machine has been stopped for a long time, the constant voltage V becomes the speed command signal for the control amplifier 6, and the roller 2 rotates. The wax solution 3 adheres to it, making it easier to perform preparatory work.

It is advantageous to replace the push button switch 13 with a timer that operates for a certain period of time when the push button switch 13 is started after being stopped for a long time, and to rotate the roller 2 about half a turn, since the preparation work can be performed automatically. In addition, in addition points 15 and 16, the plus sign indicates the electrical polarity of rotating the variable speed motor 5 in the forward direction, and the minus sign indicates the polarity of rotating the variable speed motor 5 in the reverse direction.

Here, the relationship between the rotational speed Va of the roller 2 and the amount of viscous fluid such as the wax solution 3 deposited on the KJ will be analyzed with reference to FIGS. 4 and 5. A viscous fluid such as the wax solution 3 has a falling speed of O in the part where it is in contact with the surface of the roller 2, and as it is scraped from the surface of the roller 2 in a direction perpendicular to the tangent line, it falls due to gravity with a certain velocity gradient related to the viscosity. It is thought that it will fall. From this theory, the falling speed Vc on the surface of the wax solution 30 is
%IIl from the surface of the surface, the speed increases in proportion to this.

Now, in FIGS. 4 and 5, the amount of wax solution 3 that is lifted by the rotation of roller 2 and the wax solution that tends to fall due to gravity with respect to the portion P that is not affected by surface tension in the wax solution 3 tank. Consider the quantity 3. By adjusting the difference between these two amounts, 41 deposits on the surface of the roller 2 and continues as it rotates -C
The ilQ of the wax 3 being lifted will be captured.

Initial wax solution 3 lifted by roller 2
The thickness W in the direction perpendicular to the tangent to the surface of the straw roller 2 is considered to be approximately constant regardless of the surface speed Va of the roller 2, assuming that the viscosity is constant.

On the other hand, when 41 coats of wax solution with a thickness of W is applied to the surface of the roller 2 and the roller 2 is kept stationary, if the static falling speed at the outer circumference of point P is Vc, then this static falling speed Vc is equal to the rotation of the roller 2. The relative speed is considered to be approximately constant regardless of the rotational speed Va of the roller 2. On the other hand, since the static falling velocity or relative velocity of the portion where the wax solution 3 is in contact with the surface of the roller 2 is considered to be 0,
The average falling speed or average relative speed with respect to the thickness W of the wax solution 3 is V c /2. Since the amount of wax solution applied to the roller 2 per unit time, Q, corresponds to the value obtained by subtracting the falling amount (the shaded area in Figure 5) from the initial lifting amount, the following formula ( 1) holds true.

■Q=VaXWxL --XVCXWXL- (1) Here, L is the roller length of roller 2.

Now, the purpose of the control of this invention is to control the il of wax solution 3.
Since the purpose is to make Q proportional to the system speed vb, the relationship is expressed as in the following equation (2) using a proportionality constant k.

Q=kXVbXWXL ・ −・ ・ ・ −(2) In order to obtain the relationship of formula (2) above, formula (1) and formula (
2), the following equation 3 can be derived.

k
xVb+□×■C... (3) From the above equation, the amount Q of the wax solution 3 and the system speed vb are such that the rotational speed Va on the surface of the roller 2 is set to a constant speed corresponding to Va/2.
If the speed is set to the sum of the speed proportional to the system speed vb, it will be proportional.

In addition, in FIG. 4, the solid line indicates Va>Vb/2,
The dotted line shows the case of V a #V b /2. ``Then, when setting the output signal C, the roller 2 is rotated at high speed and then stopped, the static falling speed Vc of the wax solution 3 on the outer periphery of point P is measured by δ1, and the roller 3 corresponding to 1/2 of that is measured.
This is done by adjusting the level (predetermined value) corresponding to the rotational speed (a) on the surface using the variable resistor 10.

In the present invention, since the roller for contact coating is rotated steplessly in proportion to a constant value + yarn speed, there is no need for a change gear, etc., and the operation is easy, as well as the rotation of the roller during acceleration and deceleration. It is possible to prevent spotting and spotting at low speeds. Therefore, the amount of liquid applied to the yarn sheet can be controlled with high precision.

[Brief explanation of drawings]

Fig. 1 is a system diagram of the control method of the present invention, Fig. 2 is a graph of roller rotation speed vs. system speed, Fig. 3 is a graph of the relationship between roller rotation speed and system speed and time, and Fig. 4 is a graph of the relationship between roller rotation speed and system speed. An explanatory diagram showing the relationship with the amount of liquid applied, Figure 5 is P in Figure 4.
It is an enlarged model diagram at points. I...Yarn sort, 2...Roller, 3...Wa-Nox solution, 4...Reducer, 5...Variable speed motor, 6...Control amplifier, 7...Guide roll, 8...Tachogenerator, 9
．． 10... Variable resistor, 11... Contactor, 12... Tacho generator, 13... Push metal rotor switch, 14...
Beam, 15, 16...additional points. Foil 1 figure 2 figure vb- figure 3 figure 4 9s5 prisoner

Claims (4)

[Claims] (1) In a roller contact type liquid applying device that applies the liquid to the yarn by bringing the yarn sheet into contact with the surface of the coating roller rotating in the liquid, the A method for controlling a motor for a roller contact type liquid application device, characterized in that the rotational speed of the variable speed motor is controlled in proportion to a sum signal obtained by adding a signal proportional to the speed of the yarn sheet and a signal of a predetermined value. (2) The roller contact type liquid application device according to claim 1, characterized in that the proportionality constant of the signal proportional to the speed of the yarn sheet and the signal value of the predetermined value can be arbitrarily varied. motor control method. (3) When the roller is in operation after being stopped for a long time, the roller is automatically rotated at high speed for about half a turn or more and then enters a normal operating state. 2. A motor control method for a roller contact type liquid agent applicator according to item 2. (4) Roller contact according to claim 1, 2 or 3, wherein the predetermined value is set in relation to the rotational speed of the roller and the falling speed of the liquid agent on the roller surface. A method for controlling the motor of a type liquid dispensing device.