JPS63208479A - Contact-pressure control device for take-up machine - Google Patents

Abstract

PURPOSE:To prevent the center slippage or evenness defects in the array of yarn caused by the fluctuation of contact pressure by providing a controlling means which calculates, based on the output of a pressure detecting means, such a controlled value that makes the contact pressure between a contact roller and a bobbin holder or package to be a desired value. CONSTITUTION:The contact pressure between a contact roller and a bobbin holder or package is detected by a contact pressure detecting means (a), and a feedback control on the contact pressure is performed so that the detected value is a specified desired value set by a goal-setting means (b). Therefore, regardless of the change of characteristics with time in a contact-pressure variable means (d), the fluctuation of contact pressure can be prevented, and at the same time, the contact pressure can be controlled to an arbitrary optional pattern, and consequently, the center slippage or evenness defects in the array of yarn can be prevented, and the quality of yarn can also be improved.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a contact pressure control device for a winding machine, and more specifically, the contact pressure between a bobbin holder for winding yarn and a roller in contact with the bobbin holder is controlled to a predetermined value by feedback control. It relates to a device to be controlled. (Prior art) Generally, in the process of winding yarn onto a bobbin holder at high speed to form a package, it is necessary to adjust the contact pressure between the package and the roller, which affects the quality of the yarn. . As a conventional contact pressure control device for a winder, for example,
There are those described in Japanese Patent Application Laid-open No. 1-18679 and Japanese Patent Application Laid-Open No. 52-55746. In the former device, a constant pressure is applied by fixing the pressure of a fluid cylinder that applies contact pressure between a bobbin holder for winding yarn and a roller that contacts the bobbin holder to a predetermined value using a pressure control valve. In the latter device, the contact pressure is applied by controlling a pressure control valve depending on the distance that the bobbin holder or roller moves depending on the thickness of the package wound on the bobbin holder. In addition to this, there is also an apparatus described in US Pat. No. 4,106,710, in which the above-mentioned application of contact pressure is performed particularly using gravity. (Problems to be Solved by the Invention) However, in such conventional contact pressure control devices for winding machines, although there are some differences in control modes, they all control the fluid cylinder that applies contact pressure. Since the fluid pressure was fixed at a predetermined value using a pressure control valve, in other words, the configuration was called feedforward control.
There were the following problems. In other words, since the seal resistance of the fluid cylinder and the resistance of the slide shaft change over time, for example, if the contact pressure increases during winding, the end face of the package may protrude or thread spots may occur on the ears. or On the other hand, when the contact pressure becomes small, a so-called centering phenomenon occurs in which the threads on the surface layer of the package slide toward the center. In addition, in the case where the contact pressure is controlled according to the thickness of the package being wound, the actual contact pressure value is not detected, so the relationship between the package diameter and the contact pressure value must be adjusted to the desired value. It is difficult to do so. Furthermore, when changing the contact pressure pattern, it is necessary to change the cam shape.
According to this, setting of contact pressure becomes extremely complicated. In addition, there is a conventional device described in Japanese Patent Publication No. 61-18503, but this device cannot control the contact pressure at both the tip and base ends of the bobbin holder to be uniform by varying the contact pressure. It was difficult. Furthermore, it has been impossible to maintain uniform contact pressure at both ends of the bobbin holder while gradually changing the contact pressure value according to the thickness of the package. (Objective of the Invention) Therefore, the present invention detects the pressure contact force and performs feedback control of the contact pressure value so that it reaches a predetermined target value based on this detected value. It is possible to easily and accurately control the pressing force regardless of any change in the pattern of the pressing force due to winding thickening, while preventing fluctuations in the pressing force due to changes in the yarn thickness. The purpose is to prevent unevenness and improve yarn quality. (Means for Solving the Problems) In order to achieve the above-mentioned purpose, the contact pressure control device for a winding machine according to the present invention has a basic conceptual diagram shown in FIG. a pressure contact force detection means a for detecting the pressure contact force of the contact roller, and a target setting means for setting a target value of the pressure contact force, the pressure contact force between the contact roller and the bobbin holder or the package is determined based on the output of the pressure detection means a. It is provided with a control means C that calculates a control value that becomes a target value, and a pressure contact force variable means d that varies the pressure contact force based on the output of the control means C. (Operation) In the present invention, the pressure force between the contact roller and the bobbin holder or package is detected, and feedback control of the pressure force is performed so that the detected value becomes a predetermined target value. Therefore, fluctuations in the pressure contact force are prevented regardless of changes over time in the characteristics of the pressure contact force variable means, and the pressure contact force can be easily and accurately controlled to an arbitrary optimum pattern to prevent yarn centering and thread unevenness. is prevented and yarn quality is improved. (Example) Hereinafter, the present invention will be explained based on the drawings. 2 to 4 are diagrams showing an embodiment of a contact pressure control device for a winder according to the present invention. First, the configuration will be explained. FIG. 2 is a front view of the winding machine, and in this figure, 1 is the winding machine;
2 is a frame of the winding machine 1. A turret table 3 is rotatably attached to the machine frame 2 in front of the winder 1, and two bobbin holders 4.5 are rotatably protruded from the turret table 3. A friction roller 7 rotatably attached to the frame 6 is provided above the bobbin holder 4. The friction roller 7 is driven by a motor (not shown) and is in contact with a package 8 wound on the bobbin holder 4. A traverse device 10 having a yarn guide 9 for traversing the yarn is disposed on the side of the friction roller ruff. Turning to FIG. 3, the frame 6 is connected to a slide block 11, which engages with a slider 13 via a pin 12 and is swingable between stoppers 14 and 15 with the bin 12 as a fulcrum. be. The slider 13 is movable up and down along a slide shaft 17 fixed to the body 16, and the slider 13 is provided with a first cylinder 18. The cylinder 18 has a piston 19 that comes into contact with the tip of the slide block 11, and the piston 19 generates a moment force due to the weight of the slide block 11, friction roller 7, frame 6, traverse device 10, etc. (moment force with the bin 12 as a fulcrum) ) and are wound onto the bobbin holder 4.
The contact pressure is adjusted so that b and the friction roller 7 are in contact with each other with a predetermined uniform contact force at both ends thereof. Compressed air is supplied to the cylinder 18 from a control valve 24, and the supply of compressed air from a compressor 25, which is a compressed air supply source, is controlled based on a control signal from a control unit 36, which will be described later. Further, an end of a piston 23 of a second cylinder 22 is connected to the lower part of the slider 13, and the cylinder 22 is connected to the slide block 11, the slider 13, the frame 6, the friction roller 7, the traverse device 10, etc. by the piston 23. In addition to supporting the weight, the piston 23 is moved up and down to apply a predetermined contact pressure between the friction roller 7 and the packages 8a and 8b. That is, the second cylinder 22 moves the slider 13 so that the contact force becomes a predetermined value, and the first cylinder 18 moves the slide block so that the contact force becomes uneven in the axial direction in the friction roller rough. Move 11. Compressed air is supplied to the second cylinder 22 from a control valve 20, and the control valve 20 controls the supply of compressed air from the compressor 21 to a control unit 36.
control based on control signals from. The above slide block 11, pin 12, slider 13, stopper 14.1
5, body 6, slide shaft 17, cylinder 18
．． 22, the piston 19.23, the control valve 20.24 and the compressor 21.25 as a whole constitute the contact force variable means 2.
6. On the other hand, the friction roller 7 is rotatably supported at both ends by bearings 31 and 32 fixed to the frame 6, and two packages 8a and 8b wound on the bobbin holder 4 are in contact with the friction roller rough. are doing. The distortions of the bearings 31, 32 are detected by distortion sensors (pressure contact force detection means) 33, 34, and the distortion sensors 33, 34 detect the distortion of the frame 6, which supports the bearings 31, 32, from the package 13a,
The pressing force of the friction roller 7 against the roller 3b is detected. As the strain sensors 33 and 34, for example, strain gauges are used to form a bridge circuit. Furthermore, the reason why the strain sensors 33 and 34 are provided at both ends is that it is necessary to separately detect the pressure contact force at the tip and base end of the friction roller 7 to obtain detection information to ensure that the contact pressure is uniform. Because there is. On the other hand, the rotation speed Nl111 of the bobbin holder 4 is detected by a rotation speed sensor 35 disposed opposite to the gear 4a formed at the base end of the bobbin holder 4. The outputs of the strain sensors 33, 34 and the rotation speed sensor 35 are input to a control unit 36, which further includes a setting device (target setting means) 3.
A signal from 7 is input. A setting device 37 sets the pressure contact force, winding speed, etc. The control unit 36 has a function as a control means, and includes a CPU 38, a ROM 39, an RA
It is composed of M40 and I10 ports 41. C.P.
The U38 imports external data according to the program written in the ROM 39, and while exchanging data with the RAM 40, the package 8a,
Processing values necessary for contact pressure control etc. of 8b are calculated, and the processed data is output to the I10 port 41 as necessary. (1) Signals from the strain sensor 33, 34, rotation speed sensor 35, and setting device 37 are input to the 10 port 41, and a control signal to the control valve 20, 24 is output from the I10 port 41. The ROM 39 stores programs and data to be executed by the CPU 38, and the RAM 40 temporarily stores external information and data used in calculations. Next, the effect will be explained. FIG. 4 is a flowchart 1 showing a contact pressure control program executed by the control unit 36. When the program starts, first, data and flags are cleared using Pl, and control values such as contact pressure during winding, contact pressure during turret, and compressed air pressure during rad rise are set using the setting device 37 using P2. . In this way, the optimum value is determined depending on the type of yarn to be wound. Next, read the above setting data in P3, and then read the setting data in P4.
When the slider 13 descends, the control pressure of the control valve 20 (hereinafter referred to as the descending set value) RGl and the descending set value RGI are applied to the bobbin holder 4 and the friction roller 7.
The control pressure RG2 of the control valve 24 (hereinafter referred to as the descending equalization set value) is set so that the detected values Sa and Sb detected by the strain sensors 33 and 34 are the same value when the strain sensors 33 and 34 come into contact with each other. Values Sa, Sb and their sum S
'(S'=Sa+Sb) is calculated. In the following description, for convenience, the control pressure RGI of the control valve 20 will be referred to as a first control pressure, and the control pressure RG2 of the control valve 24 will be referred to as a second control pressure. At P5, the second control pressure RG2 is controlled to be equal to the downward uniformity set value set at P4, and at P6 it is determined whether or not the starting pushbutton PB of the winding machine 1 is ON. OFF
In this case, increase the first control pressure RGI with P7 and set slider 1.
3 and clears the flag at P8 to bring the device to a stopped state. On the other hand, when the push button PB is ON, the process proceeds to step P and thereafter, and contact pressure control is executed. First, the turret flag J is determined by P. The turret flag J is activated when a turret command is issued to switch the yarn from a fully wound bobbin holder 4 to an empty bobbin holder 5 (see FIG. 2) using a known method by another program not shown in this figure.

[0]
It is incremented from [1] to indicate the presence or absence of a turret command. P, and when J=1, Pl. In order to increase the contact pressure value in the turret, the first and second
The control pressures RGI and RG2 are set to predetermined values, and it is determined whether or not the turret is completed at Pl+. If the process is not completed, the process returns to P6, and the process from P to pH is repeated until the turret completion signal is output. Then, when the turret completion signal is output, the pH changes to Pl.
Proceed to step 2, set J=O, and return to P6. On the other hand, if J=O in P9, proceed to PI3 and set the flag to 1.
Determine. Since it was initially cleared in step P, =O, the process proceeds to PHa. At Pl4, the first control pressure RGI is set to a descending set value to a pressure that allows the slider 13 to descend. As a result, the slider 13 begins to descend. Then, P
+s sets the timer to T. The value of T is maintained slightly longer than the time required for the friction roller 7 to descend and come into contact with the bobbin holder 4. In Pl6, it is checked whether the time corresponding to the timer T1 has elapsed (T
If time amplification is not performed, return to P6, and if time amplification is performed, P1 is determined.
At 7, set the flag to [1]. As a result, the friction roller 7 comes into contact with the bobbin holder 4. Next, since it is K+-1, proceed to PIB and set 2 to the flag.
Determine. Initially, since it was cleared in step P, it is 2-0, so at Pl9, the strain sensor 33.34
The detected values Sa, , Sb are read, and the difference value Sl is calculated at P2O according to the following equation. s, =3-3' =S-(Sa+Sb) ・・・・・・■However, S;
In the reference value P21, the difference value S is a predetermined value (Sl-〇 in this embodiment)
If it is not within a predetermined value, the first control pressure RG1 is adjusted so that S+=O at P2□. In this case, if S is positive, the first control pressure RGI is decreased, and if S is negative, RGI is increased. As a result, the piston 23 of the cylinder 22 moves the slider 13 in the vertical direction along the friction roller rough. As a result, the pressure contact force between the bobbin holder 4 and the friction roller 7 is feedback-controlled to the reference value S, and unlike conventional feedforward IIJ control, fluctuations in the pressure contact force can be avoided. Then, when the difference value sI falls within a predetermined value, P23
The detected values Sa and Sb of the strain sensors 33 and 34 are read in. In P24, a difference value 32 (S2 = Sa - 3b) is calculated to check whether the pressure contact force is uniform or not.
At P2S, it is determined whether the difference value S2 is within a predetermined value (52=O in this embodiment). If S2≠0, the second control pressure RG2 is adjusted in P2'6 so that it becomes 52-0. In this case, if s2 is positive, the second control pressure RG2 is increased, and if s2 is negative, RG2 is decreased. As a result, the piston 19 of the cylinder 18 swings the tip of the slide block 11 in the vertical direction between the stopper 14 and the stopper 15 using the pin 12 as a fulcrum, thereby increasing the axial direction of the pressure contact force of the friction roller 7 against the bobbin holder 4. Uniformity is corrected. Through such feedback control, the difference value S2
When becomes 32=O, the strain sensor 33.3 is turned on again at P27.
The detected values Sa and Sb of No. 4 are read, and it is determined by Pill whether these detected values Sa and Sb are within a predetermined value. If S a % 'S b is not within the predetermined value, P
After step 6, the pH returns to + and the processes of steps P+q to P28 are repeated. This process is executed by so-called proportional/integral calculation control. Then, when Sa and Sb reach predetermined values, 2 is set to [1] in the flag in P29, and the process returns to P6. Since the pressing force has reached the reference value S and the unevenness in the axial direction has been corrected in the step processing described above, the threading completion flag L is then determined in Pro. The flag L is set to [1] when the number of revolutions of the friction roller 7 and the bobbin holder 4 reach predetermined values, and when a threading completion signal is output in another program. If the completion signal is not output, the threading returns from P2O to P6 and returns to P
After 9-P+3 pHl P3'0, the thread hooker waits for the completion signal to be output. When flag L becomes [1],
The rotation speed NBH of the bobbin holder 4 is read in P3. P
In 3□, the holder rotation speed N n u and the yarn winding speed■
The winding diameters of the packages 8a and 8b are calculated from the above, and the contact pressure reference value R is calculated from the winding diameter and contact pressure value data (for example, a map) programmed in advance in P33. Then,
At P34, the detected values Sa and Sb of the strain sensors 33 and 34 are read, and at P3S, a difference value S3 with respect to the reference value R is calculated according to the following equation (2). S3 = R (S a + S b) --■ In P36, it is determined whether the difference value S3 is within a predetermined value (53=0 in this embodiment), and if it is not within the predetermined value, P3. to adjust the first control pressure RG,1. In this case, if the value of S3 is positive, the first control pressure PCI is increased, and if the value of S3 is negative, RGl is decreased. As a result, even if the winding diameter of the packages 8a, 8b changes (for example, due to a change in winding thickness), feedback control is performed so that the pressure contact force is optimal in accordance with the change. When the difference value S3 falls within the predetermined value, P37 is jumped and P
Proceed to 3+1 and again detect the detected value Sa of the strain sensor 33.34
, Sb is read. At P39, the difference value S4. (S4=Sa
-3b), and the difference value S4 is calculated at P'4G to a predetermined value (i (
In this embodiment, it is determined whether or not it is within S4-0). When the pressure is not within the predetermined value, the second control pressure RG2 is adjusted using Pd2. In this case, as above, if the value of S4 is positive,
The second control pressure RG2 is made high, and if it is negative, the second control pressure RG2 is made low. As a result, even if the winding diameters of the packages 8a and 8b change, feedback control is performed so that the pressure contact force in the axial direction of the friction roller 7 does not become uneven. difference value S
When 4 falls within a predetermined value, Pd2 is jumped and the process returns to P6. Note that the processes P31 to Pa+ are also executed by proportional-integral calculation control. Furthermore, when a turret command is issued during the above-mentioned series of processes, it is of course determined by P, and furthermore, if push button PB is turned OFF during winding, the command branches from P6 to a NO command, and P7 , pH, and then the program ends as described above. As described above, in this embodiment, the pressure contact force of the support portion of the friction roller rough is detected by the strain sensor 33, 34, and the contact pressure of the friction roller 7 against the bobbin holder 4 is determined according to the change in the winding diameter of the packages 8a, 8b. The pressure contact force is feedback-controlled so as to have an optimum value, and is appropriately corrected to eliminate unevenness in the pressure contact force in the axial direction of the friction roller rough. Therefore, the following effects can be obtained compared to the conventional method. (I) Feedback control of the pressure contact force of the support portion of the friction roller rough can prevent fluctuations in the pressure contact force regardless of changes over time in the seal resistance of the cylinders 18, 22 and the resistance of the slide shaft 17. (n) The pressure contact force can be gradually decreased or increased with high accuracy according to the thickness of the packages 8a and 8b. In addition, there is no need for a cam that determines the pressure contact pattern as in the past, and the microcomputer only needs to memorize and calculate functions or patterns for contact pressure control, allowing the setting of pressure contact force and changing the pattern. can be easily done. (I[[) Package 8a wound on bobbin holder 4
, 8b due to the bending of the bobbin holder 4 due to an increase in the weight of the bobbin holder 4, even in a winding machine in which the friction roller 7 is oscillated, the pressure contact force on both sides of the tip and base end of the bobbin holder 4 can be kept uniform. becomes possible. (IV) Due to the above effects, pressure contact force is applied uniformly and accurately to the packages 8a and 8b during winding, so
Prevents protrusion of the end faces of the pan cages 8a, 8b due to excessive contact pressure, in-centering phenomenon in which the surface layer of the pan cages 8a, 8b slides toward the center due to a decrease in contact pressure, and filamentous unevenness at the ears of the packages 8a, 8b due to excessive contact pressure. It is possible to improve the complete winding rate and yarn quality. Although the above embodiment is an example in which control calculations are realized by a microcomputer, the present invention is not limited to this, and can also be realized by a wired logic circuit, which will be described below as a second embodiment. FIG. 5 is a diagram showing a second embodiment of the present invention. In this embodiment, the configuration of a control unit 51 is different from that in the first embodiment, but the other parts are the same and are given the same numbers. In the control unit 51, the comparison circuit 52 compares the detected values Sa and sb of the strain sensors 33 and 34 and outputs the calculation result to the PI calculation control circuit 53, which connects both ends of the friction roller rough. A control value that makes the force uniform is determined by PI calculation, and the processed value is output to the control valve 24. The adder circuit 54 receives the detected value S
a and Sb are added, and the comparison circuit 55 compares the added value with the output of the multiplication circuit 56. The multiplier circuit 56 includes a setting device 37.
The output from the pattern setting circuit 57 and the output from the pattern setting circuit 57 are input. On the other hand, the winding speed calculation circuit 58 calculates the yarn winding speed V (or may be a setting device), and the winding diameter calculation circuit 59 calculates the detected value NI of the rotation speed sensor 35 and the winding speed V The winding diameters of the packages 8a and 8b are calculated based on the following. The pattern setting circuit 57 sets the optimum pattern of the contact pressure at that time based on the winding diameter, and the multiplication circuit 56 calculates a reference value that provides the optimum pattern corresponding to the data set by the setting device 37 and operates a comparison circuit. 55. The comparator circuit 55 compares the outputs of the adder circuit 54 and the multiplier circuit 56, and the P* arithmetic control circuit 60 compares the contact pressure pattern with changes in winding diameter and the axial direction of the friction roller rough based on the output of the comparator circuit 55. A control value is calculated to correct the non-uniformity of the pressure contact force, and the processed value is output to the control valve 20. Therefore, although the circuit configuration is different in this second embodiment, the same effects as in the first embodiment can be obtained. In each of the above embodiments, a friction drive type winding machine in which the bobbin holder is driven by a friction roller has been described, but the present invention is not limited to this type of winding machine. The present invention can also be applied to a spindle drive type winding machine that detects the number of revolutions of a contact roller driven in contact with a bobbin holder or the tension of a yarn, and adjusts this to a predetermined value. Further, the sensor for detecting the force acting on the friction roller is not limited to a strain sensor, and a pressure sensitive element or a displacement meter may be used. Furthermore, in each of the above embodiments, a method was adopted in which the pressure of the control valve was controlled by changing the suction force of the solenoid to adjust the secondary compressed air pressure. Alternatively, a voltage may be applied to the shape memory alloy to adjust the opening degree of the nozzle, thereby changing the pilot pressure to control the secondary side compressed air pressure using a pressure reducing valve. In this embodiment, the rotation speed of the bobbin holder is directly detected and the value is used to calculate the winding diameter, but the amount of movement of the slider may also be used. In the case of a spindle-driven winder, the frequency of an inverter that supplies power to the motor that drives the bobbin holder may be used instead of the rotational speed of the bobbin holder. The compressed air supply sources of this embodiment, the compressors 21 and 25, may be a common compressed air supply source. (Effects) According to the present invention, the pressure contact force between the contact roller and the bobbin holder or package is detected, and the pressure contact force is subjected to feedbank control so that the detected value becomes a predetermined target value, so the pressure contact force is variable. Regardless of changes in the characteristics of the means over time,
Fluctuations in the pressure contact force can be prevented, and the pressure contact force can be easily and accurately controlled to any optimal pattern. As a result, the yarn quality can be improved by preventing yarn centering and uneven yarn quality.

[Brief explanation of the drawing]

FIG. 1 is a basic conceptual diagram of the present invention, and FIGS. 2 to 4 are diagrams showing a first embodiment of a contact pressure control device for a winder according to the present invention.
Fig. 2 is a front view of the winding machine, Fig. 3 is an overall configuration diagram thereof, Fig. 4 is a flowchart showing a contact pressure control program, and Fig. 5 is a contact pressure control of the winding machine according to the present invention. FIG. 2 is an overall configuration diagram showing a second embodiment of the device. 1... Winder, 4.5... Bobbin holder, 7... Friction roller, 8a, 8b... Package, 10... Traverse device, 26... pressure contact force variable means, 33.34... strain sensor, 36.51... control unit (control m
means), 37...setting device (goal setting means).

Claims (2)

[Claims] (1) a) pressure contact force detection means for detecting the pressure contact force between the contact roller and the bobbin holder or package; b) target setting means for setting a target value of the pressure contact force; and c) an output of the pressure detection means. d) a control means for calculating a control value such that the pressure contact force between the contact roller and the bobbin holder or package reaches a target value based on the output of the control means; and d) pressure contact force variable means for varying the pressure contact force based on the output of the control means. A contact pressure control device for a winding machine, comprising: and. (2) The pressure contact force detection means is constituted by a plurality of sensors that detect the pressure contact force near both ends of the contact roller, and the control means is configured such that the pressure contact force between the contact roller and the bobbin holder or the package is determined in the axial direction of the contact roller. 2. The contact pressure control device for a winding machine according to claim 1, wherein the control value is calculated so that the control value becomes uniform and reaches a target value.