JPS62263347A - Control of fancy weaving - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to variable weave control in a loom, and more particularly to a method for accurately changing the delivery speed in synchronization with changes in the winding speed.

The weft density of the conventional woven fabric, that is, the weft density is:
It can be changed by changing the winding speed while keeping the main motion constant.

For example, the invention of Japanese Patent Publication No. 44-28270 discloses a technique for performing variable weaving by changing the winding speed while the loom is in operation,
The invention of No. 1 discloses digitally changing the winding speed of the woven fabric and the delivery speed of the warp threads. However, according to experimental results, it has been found that even if the rotation of the take-up roll is suddenly changed during the weaving stage, the weft density does not change sharply.

Possible causes of this include a delay in the response of the winding control system, a delay in the response of the delivery tension control system, and elongation of the warp yarn.

Among these causes, the response delay of the control system is
This problem can be solved by the invention of No.-199541. The present invention has been developed in accordance with Japanese Patent Application Laid-Open No. 5-11702, in response to the above two causes, namely, the delay in response of the sending tension control system and the elongation of the warp yarns.
This solution is intended in connection with the invention of No. 9-157354.

By the way, as a means of changing the weaving density by interlocking the feeding of the warp threads and the winding movement of the woven fabric,
There is an idea of No. 1-16382.

The idea was to convert the rotation command signal on the take-up side into a signal that is inversely proportional to the winding diameter of the delivery beam, in order to speed up the response speed of the tension control system on the delivery side when changing the weaving density. It is added to the control system.

However, in the above-mentioned invention, the basic formula for the delivery speed is merely corrected from the outside by adding or subtracting changes in the weaving density and the winding diameter of the delivery beam. For this reason, with the above-mentioned idea, it is difficult to achieve accurate control that is faithful to the basic formula for the feeding speed. Note that this basic formula is described and explained later.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to correct, when changing the driving density, by adding information on the density change to the feed-out control system in a form faithful to the basic equation of the feed-out speed.
The objective is to realize stable and accurate variable weave control over a wide range.

Solution to the Invention Therefore, the present invention corrects the speed command on the feeding side by the ratio of [1/driving density] when changing the driving density, and advances the feeding control while faithful to the basic equation of the feeding speed. I have to.

Particularly, in the present invention, the above-mentioned ratio of [1/implantation density ko] is determined by switching the resistor voltage division ratio, gain, and calculation when changing the implantation density, and inputted into the delivery control system.

Configuration of Control System (FIGS. 1 and 2) First, FIG. 1 shows the overall configuration of a variable weave control device 1 according to the method of the present invention, together with the paths of warp yarns 2.

The warp yarns 2 are wound in a sheet form around the outer periphery of the delivery beam 3, are brought into a nearly horizontal state after passing through a tension roll 4, form an opening 6 with the belt 5, and intersect with the weft yarns 7 at the front weaving position of the opening 6. Then, by the beating motion of the reed 8, it is woven into a woven fabric 9. Further, the woven fabric 9 passes through the presto beam 10, the take-up roll 11, and the guide roll 12, and is wound around the outer periphery of the cloth-wrapped beam 13.

Then, the above-mentioned sending beam 3 and the winding roll 1
1 is driven by a variable speed feed-out motor 14 and a take-up motor 15, respectively, with gears 16 and 17 interposed therebetween. The delivery motor 14 and the take-up motor 15 are controlled by a delivery tension control device 21 and a take-up control device 22, respectively.

The sending-out tension control device 21 detects the tension of the warp yarns 2 and controls the rotational speed of the sending-out motor 14, that is, the sending-out speed of the warp yarns 2 based on the change in the tension. , addition point 2
4, PI calculator 25, speed calculator 49, speed! It includes a command switch 26, a summing point 27, and a drive amplifier 28.

The tension of the warp threads 2 is, for example, the tension of the tension roll 4.
The tension is detected by a tension detector 29 such as a load cell connected to the summing point 24, and is applied as a negative signal to the summing point 24. Further, the rotation speed of the delivery motor 14 is detected by a tacho generator 30 and applied to a summing point 27 to form a feedback control system.

Further, the winding control device 22 includes a density setting device 31 and a density controller 32 in order to control the winding speed of the woven fabric 9 and to change the driving density B of the woven fabric 9. The former density setting device 31 is connected at its input end to a timing generator 56 of the crankshaft 19 of the loom driven by the driving motor 18 of the loom, and at its output side is connected to the speed command switch 26, the speed It is connected to the computing unit 49 and the density controller 32. In addition, the latter density controller 32
is connected to the pulse generator 33 and shaft encoder 20 of the winding motor 15, and is connected to the winding motor 15 on the output side.

Next, FIG. 2 shows the internal structure of the speed calculator 49 and the connection relationship between this and other components. The speed calculator 49 includes a calculation circuit 63 interposed between the PI calculator 25 and the speed command switch 26, a rotation speed detector 61 connected to the input side of the calculation circuit 63, and a winding diameter detector 62. ing. The external proximity switch 65 and the initial winding diameter setter 67 are connected to the input end of the winding diameter detector 62, and the rotation speed setting device 68 is connected to the input end of the rotation speed detector 61. has been done. Further, the rotation speed detector 61 and the winding diameter detector 62 are both connected to the timing generator 56 on the input side. The timing generator 56 detects the fixed rotation angle of the crankshaft 19 of the loom and provides timing necessary for speed calculation. Also,
The density input device 66 is connected to the input end of the arithmetic circuit 63 as well as the winding diameter detector 62.

Function of control system During normal weaving operation, the winding control device 22 operates the winding motor 15 in synchronization with one crankshaft at a division ratio set by the output of the density setting device 31. , the winding roll 11 is rotated at a predetermined winding speed. In this way, the woven fabric 9 is wound around the outer periphery of the cloth-wound hem 13 over time.

On the other hand, the feed-out tension control device 21 uses the basic tension set by the tension setting device 23 as a basic condition for operation, increases or decreases the rotational speed of the feed-out motor 14, and maintains the tension of the warp threads 2 at a target value. It is fed out at a predetermined feeding speed. This change in the tension of the warp threads 2 is converted into an electrical signal by the tension detector 29, which is input from the addition point 24 to the tension correction unit 25 of the P■ calculator 25.

Therefore, the P calculator 25 responds to fluctuations in the tension of the warp yarns 2 and follows the target value through proportional and integral operations. .

Note that the tension in the warp threads 2 is momentarily increased during one revolution of the crankshaft 19 due to the shedding motion and the subsequent beating motion. However, this influence can be removed by calculating the average value of tension values at a plurality of predetermined timings. However, when the average tension gradually increases, for example, the P■ calculator 25 gradually increases the rotational speed of the feed-out motor 14, and sets the amount of feed of the warp threads 2 to be proportionally increased. In this way, warp thread 2
The tension is always set to the target tension regardless of the progress of weaving.

During this time, the torpor setting device 31 synchronizes with the rotation of the crankshaft 19 and sends a signal of the preset driving density B to the density controller 32, the speed calculator 49, and the speed command switch 26. The winding speed and feeding speed are set according to the density. Therefore, the rotational speeds of the feed-out motor 14 and the take-up motor 15 are set to appropriate speeds according to the predetermined driving sound intensity.

Specific control methods and circuit examples of the feed tension control device 21 and the winding control device 22 are shown in each embodiment described later.

Function of the speed calculation circuit During this period, the rotation speed detector 61 detects the rotation speed n of the crankshaft 19.
The signal o is manually input, the rotational speed n is determined, and the information is sent to the arithmetic circuit 63. In addition to signals of the initial winding diameter D O8 and the driving density B for each reference rotation position, the winding diameter detector 62 also uses a rotation signal from the gear 16 from the proximity switch 65 as human power to detect the warp yarn 2 in the sending beam 3. The winding diameter is detected. In this example, the implantation density is 81. Here, the winding diameter is determined by the following formula.

However, m, Pw, and PL in the above formula each represent the following.

m: Reduction ratio of gear 16 PW: Number of gear rotation pulses pt,: Isa Number of machine rotation pulses The arithmetic circuit 63 calculates the driving speed set in the density input device 66 in addition to the information on the rotation speed n and winding diameter. Using the information of the density B1 as input, first, calculate the basic feeding speed N
Obtain O by calculation. Here, the basic speed No. is determined by the following formula, assuming that the reduction ratio from the delivery motor 14 to the delivery beam 3 is m.

π BL D Then, the signal of the output Mp from the PI calculator 25 is applied in a superimposed manner at a ratio of 1 to this basic speed NO to generate a speed command signal N, which is used for speed command switching. into the container 26.

The speed command signal N has a ratio of 1 to the basic speed NO.
/l'oo, it is expressed by the following formula.

Example 1 (FIG. 3) FIG. 3 shows a specific configuration of Example 1. The sound intensity setting device 31 of this embodiment includes a density switching command circuit 34 connected to a timing generator 56, two setting circuits 35.
36 and a switching circuit 37. In addition, the speed I command switch 26 is a transmission path for the speed command signal N of the speed calculator 49, and includes a variable resistor 38 for voltage division and relay contacts 41 and 42 of relays 39 and 40. A driver 43,44 controlled by the density switching command circuit 34 and a knot circuit 45 are provided to drive the relay 39,40.

The density switching command circuit 34 receives a signal from a timing generator 56,
That is, in synchronization with the rotation of the crankshaft 19 of the loom, a density switching command signal of "H" level or "L" level is generated as set in advance, thereby operating the switching circuit 37 and also controlling the driver 43. By selectively driving one of the relay contacts 41 and 44, the relay contacts 41 and 42 are set to the on state alternately (in this way, the two driving densities B1 from the setting circuits 35 and 36 , B2 are connected to the density controller 32 via the switching circuit 37.
are output alternately.

On the other hand, the speed command signal N of the speed calculator 49 is divided by the variable resistor 38, and is sent to the drive amplifier 28 in synchronization with the switching of the driving densities B1 and B2 by the alternate ON states of the relay contacts 41 and 42. sent. Here, the setting is limited to setting the implanting density B2 of the other setting circuit 36 to be greater than the implanting density B1 of the one setting circuit 35, thereby simplifying the circuit configuration.

Here, the above-mentioned basic formula for the feed speed, that is, the basic speed No (rpm) and the speed command signal N (rpm) are as follows:
As already described, the driving density Bl (number of pieces/cm) set on the delivery side is expressed by the following formula.

π BI D However, the symbols in the formula are as follows.

m: Reduction ratio of gear 16 n:! The rotation speed of the crankshaft 19 of the 5ili machine (rp
m) D: Winding diameter of sending beam 3 (cm) Mp: PI
Output of the arithmetic unit 25 On the other hand, if the voltage division ratio of the variable resistor 3rd is V / Vo, then when the setting circuit 35 is selected, that is, when the implantation density B = 81, the voltage ■ = Vo. , when the setting circuit 36 is selected, that is, when the implantation density B=82, the voltage ■=(B 1/B 2) V
o, the input N i n to the drive amplifier 28 is
It is given by the following formula.

(2) Therefore, in each case, the human forces Nin1 and Nin2 for the drive amplifier 28 can be expressed by the following equations.

■0 In this way, when switching the implantation density B, the drive amplifier 28
input immediately changes to the basic two ratios (1/B1 or 1/B1).
Since the voltage value is changed to B2), the delivery tension control device 21 immediately follows it and rotates the delivery motor 14 at a predetermined speed.

In addition, in FIG. 3, the variable resistor 38 is interposed only on the side corresponding to the setting circuit 36, but this variable resistor 38
may be similarly provided on the side corresponding to the setting circuit 35. In order to further speed up the response, these settings may be set to a value obtained by multiplying the partial pressure ratio by a certain coefficient. Further, in the above embodiment, the voltage of the speed command is divided into voltages, but this voltage value may be output while being amplified as necessary in combination with an appropriate amplification circuit.

Embodiment 2 (FIG. 4) Embodiment 2 shown in FIG. 4 shows an example in which a programmable gain amplifier circuit 46 is used instead of the variable resistor 38.

Embodiment 1 described above has the disadvantage that the setting of the variable resistor 38 is not accurate, and as a result, the feed control does not correspond accurately to changes in the density control. However, in this second embodiment, the amplification degree is automatically determined by the divider circuit 47 from the set value of the implantation density B itself, and the gain of the amplifier 46 is set to an appropriate value by operating the gain switching circuit 48. are doing. Therefore, in this embodiment, no adjustment or setting of the variable resistor 38 is required.

Embodiment 3 (FIGS. 5 and 6) In this embodiment 3, as shown in FIGS. 5 and 6, the speed command signal N manually input from the speed calculator 49 by the speed↑bet switch 26 When the switching circuit 37 switches between the driving densities B1 and B2 in response to a density switching command signal from the density switching command circuit 34, the speed calculator 49 calculates the driving density B1 or B2. An example is shown in which the basic speed NO is calculated directly from the basic equation using the signal as input. Of course, this speed calculator 49 applies the output Mp of the Pi calculator 25 in a superimposed manner at a constant ratio to the determined basic speed NO, and outputs an appropriate speed command voltage.

Embodiment 4 (FIGS. 7 and 8) Furthermore, in Embodiment 4 shown in FIGS. 7 and 8, the driving density B (B
This is an example in which the values of 1, B2) are manually entered into the speed calculator 49 through the density input circuit 51. here,
The speed calculator 49 calculates the driving density B1 as in the third embodiment.
, B2 is used to find the basic speed NO, and the output Mp of the PI calculator 25 is added thereto in a superimposed manner.

Embodiment 5 (FIGS. 9 and 10) In this Embodiment 5, as shown in FIGS. 9 and 10, the voltage of the tension signal from the tension detector 29 is divided in accordance with the implantation density. There is. By doing this, when the driving density is 82, it is intended to lower the warp tension in a pseudo manner than when it is B1, and in addition to the above-mentioned Example 1, the tension is Also, a tension switching circuit 52 is interposed, and a variable resistor 38a and relay contacts 41a and 42a are incorporated.

When changing the density, for example, if the implantation density B2 is high density,
Moreover, if the tension of the warp yarns 2 is high, the shedding is likely to be insufficient, and it is conceivable that the front of the weave may vibrate in a complicated manner without being driven. This embodiment is effective in reducing the tension of the warp threads 2 and preventing flapping of the front when the density is changed.

Embodiment 6 (FIG. 11) Embodiment 6 in FIG. 11 is based on the third embodiment (FIG. 5), and the density switching command circuit 34 controls which of the two tension setting devices 23a and 23b. An example is shown in which one of the signals is selectively outputted by the switching circuit 53. In this case, the target tension value is switched, and the same effect as in Example 5 is obtained, and moreover, the speed of the feed motor 14 is synchronized with the change in the driving density B and quickly follows it.

Embodiment 7 (FIG. 12) Further, Embodiment 7 shown in FIG. 12 is based on the fourth embodiment (FIG. 7), and the driving density B and the target This is an example in which tension values are input to the implant density input circuit 51 and tension input circuit 54, respectively.

In this embodiment, the human power of the PI calculator 25 is calculated based on the target tension value given by the tension input circuit 54 and the tension detector 2.
9 as the deviation from the actual tension value detected.

Effects of the Invention In the present invention, when the driving density is changed, a corresponding signal is also applied to the feeding tension control system, and moreover, it is given in the form of a ratio according to the basic equation of the feeding speed. Feed-out control accurately follows changes in driving density, and stable density control over a wide range, that is, variable weave control, can be achieved.

[Brief explanation of drawings]

FIG. 1 is a Bronze line diagram of the variable weave control device of the present invention;
FIGS. 2 to 5 are block diagrams of main parts in each embodiment. DESCRIPTION OF SYMBOLS 1... Variable weave control device, 2... Warp, 3... Delivery beam, 11... Winding roll, 14... Delivery motor, 15... Winding remoter, 21... Delivery tension control device, 22. - Winding control device, 23... Tension setting device, 25... PI calculator, 26... Speed command switching device,
27...Summing point, 28...Drive amplifier, 31...
Density setting device, 32... Density controller, 34... Density switching command circuit, 35. 36... Setting circuit, 37... Switching circuit,
38... Variable resistor for voltage division, 41.42... Relay contact, 46... Programmable gain amplifier, 47... Divider circuit, 48... Gain switching circuit, 49... Speed calculator.

Claims (6)

[Claims] (1) In a loom that performs variable weaving by changing the rotational speed of the take-up roll during continuous operation of the loom, the speed command of the feed-out control device is output based on the basic formula of the feed-out speed, and the driving density is changed. A variable weaving control method characterized in that the speed command is changed according to a value of driving density in synchronization with. (2) When changing the driving density, change the speed command above to [1/
2. The variable weave control method according to claim 1, wherein the change is made by changing the ratio of the driving density. (3) The variable weave control method according to claim 2, characterized in that, when changing the driving density, the ratio of [1/ driving density] is set by a resistance partial pressure ratio. (4) The variable weave control method according to claim 2, characterized in that when changing the driving density, the ratio of [1/ driving density] is set by switching a gain. (5) The variable weave control method according to claim 1, characterized in that, when changing the driving density, the speed command is changed from the value of the driving density to a value calculated based on a basic formula. (6) The variable weave control method according to any one of claims 1 to 5, characterized in that when changing the driving density, the tension setting value of the delivery tension control device is changed in a corrective manner.