JPH0210137Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a warp control device that can freely adjust the weaving density of a woven fabric during weaving.

Prior Art A tension control system is used to control the warp threads of a loom during weaving. The tension control system is equipped with an integral element with a large time constant in order to absorb sudden changes in tension during one revolution due to the shedding motion unique to looms and the beating motion, and to improve control stability.

On the other hand, as a method for changing the weave density of a woven fabric during weaving, it is generally practiced to change the speed of a take-up roll. However, when the speed of the take-up roll is changed, the warp delivery speed does not follow quickly due to the large time constant of the tension control system, and the tension of the warp changes temporarily, resulting in a decrease in weave density. The instructions are not followed, and a weaving step occurs in that area. Therefore, under the conventional tension control system, it is difficult to periodically change the weaving density during weaving and weave a fabric with the thread density as instructed.

Purpose of the invention Therefore, the purpose of the invention is to increase the response speed of the tension control system on the sending side when changing the weaving density, thereby making it possible to weave a fabric with the weaving density as instructed on the winding side. It is to do so.

Summary of the invention Therefore, the present invention adopts a method in which the winding roll and the sending beam are directly driven by a motor, and the density command signal on the winding side is sent to the winding beam of the sending beam without changing the integral operation of the tension control system on the sending side. It is converted into a signal that is inversely proportional to the diameter, and this is applied to the output side of the tension control system for sending out, in other words, it is applied without receiving integral action, and it is synchronized with this when changing the weaving density, that is, when changing the winding speed. This is done to speed up the response speed of feed control.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be specifically described below based on an embodiment shown in the drawings.

First, FIG. 1 shows a warp control device 1 for a loom according to the present invention together with a warp 2 path. The warp control device 1 includes a tension control device 3 on the delivery side of the warp yarns 2 and a speed control device 4 on the winding side of the woven fabric 11.

The warp yarns 2 are wound around a delivery beam 5, passed through a tension roll 6, become almost horizontal, and are formed into an opening 8 by a heald 7.
It intertwines with the weft thread 9 at the weaving opening position, and becomes a woven fabric 11 by the beating motion of the reed 10. This woven fabric 11 has a presto beam 12, a winding roll 13
After that, the cloth is wound onto the cloth-wrapping beam 14.

The delivery beam 5 and the take-up roll 13 are operated by gears 17 and 18 by a variable speed delivery motor 15 and a take-up motor 16, respectively.
It is in a relationship that it is driven with the intervention of.

The tension control device 3 detects the tension T of the warp threads 2, and controls the rotational speed of the delivery motor 15, that is, the delivery speed V1, based on the change in tension. It has a drive amplifier 23 connected to point 20 , tension controller 21 , summing point 22 and delivery motor 15 . The tension of the warp yarns 2 is detected by a pressure detector 24 such as a load cell connected to the tension roll 6, and its output is inputted to the other input terminal of the tension controller 21 via an amplifier circuit 25. Ru. Also, the sending beam 5
The winding diameter is determined by the winding diameter detector 26 installed nearby.
detected by. And this winding diameter detector 26
is connected to the summation point 22 on the output side of the tension controller 21 via the speed control calculator 27. A tachometer generator 28 is connected to the feed motor 15, and is applied to the summing point 22 as a feedback signal of the amount of rotation.

In addition to controlling the winding speed of the woven fabric 11, the speed control device 4 is also connected to a density command device 29 connected in series, a summing point 30, and a winding motor 16 in order to control the density of the woven fabric 11. The drive amplifier 31 is equipped with a drive amplifier 31. Again, the rotational speed of the winding motor 16, that is, the winding speed V2, is detected by the tachogenerator 32 and fed back to the summing point 30. The output end of the density command device 29 is also connected to the other input end of the speed control calculator 27.

Function of the invention Next, the function of the warp control device 1 will be explained based on FIG. 2.

During normal weaving operation, the speed control device 4 controls the winding motor 16 at a speed set by the density command signal S as the output of the density command device 29.
is rotated, and the winding roll 13 is rotated at a constant winding speed V2. In this way, the woven fabric 11 is sequentially wound around the outer periphery of the cloth-wound beam 14 as time t passes.

On the other hand, the tension control device 3 increases or decreases the rotational speed of the feed-out motor 15, using the basic tension set by the tension setting device 19 as an operating condition, and
While keeping the tension at a constant value, the feeding speed V1
I am sending it out. This tension change in the warp threads 2 is converted into an electrical signal by the tension detector 24 and fed back to the tension controller 21. The tension controller 21 therefore responds to variations in the tension of the warp yarns 2 and follows them in a proportional and integral manner. Further, as the weaving progresses, the winding diameter of the sending beam 5 becomes smaller, so the speed of the sending motor 15 needs to be increased. Therefore, the speed control calculator 27 sends a signal inversely proportional to the signal from the winding diameter detector 26 to the summing point 22,
This corrects the winding diameter.

Now, as shown in Fig. 2, the tension T of the warp threads 2
is instantaneously high during the opening movement and the subsequent flattening movement. However, the tension controller 21
performs an integral operation with a large time constant, so it absorbs temporary changes in tension during one revolution of the loom.
However, when the average tension gradually increases, for example, the tension control device 3 controls the feed motor 15.
The rotational speed of the warp threads 2 is gradually increased, and the amount of feed of the warp threads 2 is increased proportionally. In this way, warp thread 2
is always set at the target tension regardless of the progress of weaving.

Here, in order to change the weaving density D, if the density command signal S is greatly changed, for example, in a step manner by the density command device 29, the winding motor 16
The rotation speed also changes immediately in steps. On the other hand, this density command signal S is also sent as is to the speed control calculator 27, and is directly applied to the summing point 22 without passing through the tension controller 21, in other words, without being affected by the integral operation. . Therefore, the rotational speed of the feed motor 15 responds rapidly in a stepwise manner, similar to changes in the take-up motor 16. In this way, since both the delivery speed V1 and the winding speed V2 change almost simultaneously, the fabric according to the command of the weaving density D is woven. In the drawings, dotted line portions indicate changes in the delivery speed V1 and the weaving density D in the conventional example. In addition, speed control calculator 2
7 multiplies the density command signal S by an appropriate coefficient in consideration of the elongation of the warp threads 2 and mechanical friction, and sends the density command signal S to the summing point 22.

Circuit Example of Density Command Device Here, a specific circuit example of the density command device 29 will be described.

FIG. 3 shows a specific circuit in the case where the weave density D is high and the weave density D is high, and the weave density D is high and the weave density D is low, and the weave density D is low.

The counter 33 counts the input pick number signal P, and when the count value C reaches the respective preset value of the number of hits P1 or the number of hits P2, switches the switch 36 to the a contact or the b contact. Note that this preset value is set by preset devices 34 and 35. Weave density setting devices 37 and 38 are connected to the a and b contacts of this switch 36, respectively, and these are connected to a power source 40 by a power switch 39 that is turned on during operation. These weaving density setters 37 and 38 give voltage values S1 and S2 corresponding to the magnitude of the weaving density D.

As a result, the voltage values S1, S2 of the density command signal S
As shown in FIG. 4, changes stepwise at regular intervals. In this way, the woven fabric 11 having a predetermined weaving density D is woven.

Note that the counter 33 is configured using an up counter, a down counter, or a counting function of a microcomputer.

Effects of the invention In the present invention, when changing the weaving density, the density command signal is also sent to the tension control system without being affected by the integral action of the tension control system. The warp delivery speed can be changed proportionally with a high response speed, so a fabric with the weave density as per the command is woven, and in the process of changing the density, the integral function of the tension control system, that is, the slow response speed It is possible to prevent the occurrence of weaving steps due to Note that this invention describes the case where the weaving density is changed periodically, but for example, in order to prevent the so-called stop that occurs when the loom stops, the density command is set so as to cancel out the density change that occurs as a stop. It can also be applied when controlling with a device (density setting device).

[Brief explanation of the drawing]

Figure 1 is a block diagram of the warp control device of the loom of the present invention, Figure 2 is a characteristic diagram showing changes in tension, feed amount and winding amount, and Figure 3 is a block diagram of the density command device. FIG. 4 is a time chart showing changes in the counter value and the density command signal. 1... Warp control device of the loom, 2... Warp,
3...Tension control device, 4...Speed control device, 15
...Feeding motor, 16... Winding motor, 1
9...Tension setting device, 21...Tension controller, 22...
...Addition point, 24...Tension detector, 27...
Speed control calculator, 29...Density command unit.

Claims (1)

[Scope of utility model registration request] A variable speed delivery motor and a take-up motor are respectively connected to the delivery beam and take-up roll of the loom, and a tension control device is connected to the delivery motor and a speed control device is connected to the take-up motor. The output ends of the beam diameter detector and the density command of the speed control device are connected to the input end of the speed control calculator, respectively, and the output end of the speed control calculator is connected to the tension controller in the tension control device. A warp control device for a loom, characterized in that it is connected to a summing point on the output side.