JPH0449175A - Warp tension correcting method - Google Patents

Abstract

PURPOSE:To decrease parameters at correction time so as to simplify a correction arithmetic operation and a control system by multiplying a detected tension value or a control target value by a correction amount, changed by fixed ratio according to decrease of a winding size, thereafter feeding the correction amount into a comparator in a tension control system CONSTITUTION:When a winding size D is maximum, warp tension T1 is set to a target tension value t0, and a detected tension value T2 at this time is set to the control target value t0 by a target setter 28. In this way, a correction amount Kd at maximum winding diameter Dmax time is set to '1'. Next, a correction coefficient (a) is set to a suitable value relating to a coefficient setter 16 to check whether looseness or excessive tension is generated or not in a warp 1 according to decrease of the winding diameter D by actually continuing weaving, and when the looseness or the excessive tension is generated in the warp 1, the optimum correction coefficient (a) is finally determined by correcting it in a direction of eliminating the looseness or the excessive tension. This coefficient is used as the correction coefficient at regular weaving time and set by the coefficient setter 16 to serve as one input to a tension corrector 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tension correction method for a tension control system for electric delivery of a loom.

[Conventional technology]

JP-A-59-194963 discloses a tension correction means. The tension correction means calculates the input angle of the strip to the tension roll based on the winding diameter according to the change in the contact angle of the strip to the tension roll, and adjusts the detected tension value according to the change in the winding diameter. It is being corrected.

[Problems with conventional technology]

According to the above technology, when the tension roll and its position are changed due to a change in the type of fabric when the strip material is warp yarn, the number of setting values that must be changed increases accordingly, making the initial work complicated. Moreover, since the calculations are complicated, there is a problem that the control system becomes complicated.

[Purpose of the invention]

Therefore, an object of the present invention is to reduce the number of correction parameters and simplify the correction calculation and control system when detecting the tension of electric feeding.

[Solution Means of the Invention and its Effects] In view of the above-mentioned object, the present invention detects the tension of the warp as a resultant force in the warp winding direction at the position of the tension roll in a tension control system for electric delivery of a loom, and When the beam has the maximum winding diameter, the warp tension is set to the target tension, and the detected tension value at this time is set as the target value of the tension control system, thereby setting the correction amount at the maximum winding diameter to "1", As the winding diameter decreases, the detected tension value or control target value is multiplied by the right correction amount, which changes at a constant rate, and sent to the comparator of the control system.

In this way, since the correction is performed using the right correction amount that changes based on the correction coefficient, only one correction coefficient is required to change the parameter when the weave of the fabric is changed, and the initial setting is easy. Once the correction coefficient is set, the only data required for the correction calculation is the winding diameter, so the correction calculation can be simplified and the control system for the correction can be configured with simple electrical elements. Since the detected tension is corrected by linear approximation, there will always be an error between the actual warp tension value and the corrected detected tension value, but if the correction coefficient is an appropriate value, the amount of error will be , within the range where no adverse effects appear in the field of practical control.

Example 1 below is an example of correcting the detected tension value, and Example 2 is an example of correcting the control target value.

[Embodiment 1 (Figs. 1 and 2)] Fig. 1 shows a tension control system for electric feeding.

The warp threads 1 are wound around the delivery beam 2,
It becomes a sheet and is wound around the tension roll 3 at a predetermined winding angle θ, forms an opening with the belt 4, intertwines with the weft thread 5, and becomes the cloth 6. The cloth 6 is then wound up around the outer periphery of the cloth-wrapping beam 8 via a winding roll 7. Here, the delivery beam 2 is rotationally driven in the delivery direction by a delivery motor 14 and a reduction gear 15. This delivery motor 14 is controlled by a tension control device 10. This tension control device 10 adjusts the warp tension T1 to a target tension value tQ during weaving.
The rotation of the feed motor 14 in the feed direction is adjusted.

In the process of feeding out warp thread 1, the warp thread tension of warp thread 1
is detected as an electrically detected tension value T2 signal at the position of the tension roll 3 by the load cell 9a and the tension detector 9, and is directly displayed on the display 11 if necessary. Here, the load cell 9a and the tension spring 12 are in series, and the tension roll 3
and the loom frame 13, directed in the direction of the resultant force of the warp yarns 1.

During the feeding process, the winding diameter (diameter) D of the warp yarn 1 on the feeding beam 2 changes in the decreasing direction in the range from the maximum winding diameter Dmax to the minimum winding diameter Dmin, and the winding angle θ also changes, so the detected tension value The relationship between T2 and the actual warp tension T1 is not constant.

Therefore, in this embodiment, in order to correct the detected tension value T2, a correction coefficient a, a winding diameter (diameter) D, etc. are introduced, and the correction 1
)(d is determined by the following correction formula.

First, at the trial weaving stage, the following work is performed. When the winding diameter is maximum, set the warp tension T1 to the target tension value to,
The detected tension value T2 at that time is set as the control target value to, and is set by the target setter 28. As a result, the correction tKd when the maximum winding diameter I)max is set to "1". Next, set the correction coefficient a in the above formula to an appropriate value, for example, "50" in the coefficient setting device 16, and actually continue weaving. As a result, it is checked whether warp yarn 1 becomes loose or excessive tension occurs, and if warp yarn 1 becomes loose or excessive tension occurs, a correction coefficient (slope of the straight line) is set in the direction to eliminate it. a is corrected, and finally the optimum correction coefficient a is determined. That is, if the detected tension is corrected based on the determined correction coefficient a, it can be said that there will be no adverse effect on control during the entire process of changing the winding diameter. Then, the coefficient setter 16 uses this as a correction coefficient during regular weaving.
is set as one input of the tension compensator 17.

Note that the winding diameter is indirectly determined from the ratio of the amount of rotation of the sending beam 2 to the amount of rotation of the main shaft 20 driven by the driving motor 22.

In this embodiment, the amount of rotation of the delivery beam 2 is determined by a pulse generator 2 connected in series to the delivery motor 14.
The amount of rotation of the main shaft 20 is determined from the number of pulses of the encoder 23 connected thereto, and is calculated by the winding diameter detector 24. Here, the tension corrector 17 inputs the detected tension value T2, the correction coefficient a, and the current winding diameter, calculates the correction tKd from the above correction formula, and multiplies this by the detected tension T2, thereby producing a correction tension Kd. −72 is calculated and sent to the comparator 18 as a negative signal, that is, as a tension feedback signal. Therefore, the output of the comparator 18 is (t 0−Kd−
72), which becomes the input to the next tension controller 19 as a deviation.

Here, the tension controller 19 inputs the output of the comparator 18, that is, the deviation, and sends an output proportional to the deviation to the drive amplifier 26 via the addition point 25, and drives the feed motor 14 at a predetermined speed to eliminate the deviation. Rotate by a predetermined amount in the direction. Note that the output of the pulse generator 21 is as follows:
The number of pulses is converted into a voltage by the F/V converter 27, and by negative feedback to the summing point 25, it is also used as a speed feedback signal.

[Embodiment 2 (Figures 3 and 4)] In this embodiment, as shown in Figure 3, the tension detector 9 is directly connected to the comparator 1 in order to correct the control target value to. , a target corrector 29 is interposed between the target setter 28 and the comparator 18,
The function of the coefficient setter 16 is also performed by the target setter 28.

The correction amount Kd in this embodiment is expressed by the following correction formula.

Here, since the correction amount Kd decreases as the winding diameter increases, it is expressed as a straight line graph in FIG. In this embodiment as well, the correction coefficient a is determined by experimentally determining the optimum value through trial weaving, as described above. Therefore, the output of the comparator 18 is (K4-tO-72).

〔Effect of the invention〕

In the present invention, since the only parameter to be changed as the fabric structure is changed is the correction coefficient of the correction amount, initial setting is easy and the configuration of the control system can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the warp tension control system for sending out according to the first embodiment, Fig. 2 is a graph of the right correction amount with respect to the winding diameter,
FIG. 3 is a block diagram of the main part of the second embodiment, and FIG. 4 is a graph of the right correction amount with respect to the winding diameter. 1. Warp thread, 2. Delivery beam, 3. Tension roll, 10. Tension control device, 14. Delivery motor, 16. Coefficient setting device, 17. Tension compensator, 18.
- Comparator, 19... Tension controller, 24... Winding diameter detector,
28... Goal setting device. Patent application agent: Hitotsudakoma Kogyo Co., Ltd.
Person Patent Attorney Kunio Nakagawa Figure 7

Claims (1)

[Claims] In the tension control system of the electric sending-off device of the loom, which detects the warp tension as the resultant force in the winding direction of the warp at the position of the tension roll, the warp tension is set to the target tension at the maximum winding diameter on the sending-off beam, By setting the detected warp tension value at this time as the control target value,
The correction amount at the maximum winding diameter is set to 1, and after multiplying the detected tension value or control target value by the right correction amount, which changes at a constant rate as the winding diameter decreases, the comparator of the tension control system A warp tension correction method characterized by feeding.