JP2968305B2 - Loom winding diameter detection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a winding diameter detection device for a delivery beam in an electric delivery device of a loom.

[Prior Art] In an electric feeding device, since the winding diameter of a beam for sending out a warp decreases with the progress of weaving, it is necessary to detect the winding diameter of the warp in the beam for controlling the rotation amount of the beam. .

Generally, the winding diameter (radius) R of a beam is represented by the following equation using the moving speed V of the warp yarn, the rotation speed W of the beam, and the pi.

Therefore, if the moving speed V and the rotational speed W are actually measured and substituted into the above equation, the beam diameter R can be obtained by calculation. However, the moving speed V of the warp yarn can be obtained indirectly from the number of picks of the loom and the driving density without actually measuring the warp.

Therefore, the invention disclosed in Japanese Patent Application Laid-Open No. 59-157354 does not measure the moving speed V, but measures the number of rotation pulses P _L of the main shaft proportional to the number of picks of the loom, the driving density B, and the number of rotation pulses P _W on the beam drive side. , And the gear ratio m of the rotation transmission path is determined by the following equation.

[Problems of the prior art] However, in the actual control process, the winding diameter calculated by
It was found that the actual measured beam diameter was different. In the process of analyzing the cause, whether the implantation density is large,
Alternatively, it was found that when the warp yarn tension was small, the degree of bending of the warp yarn when the actual fabric was formed was changed, and this affected the consumption amount of the warp yarn.

[Object of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to make it possible to accurately detect the winding diameter of a yarn with a beam by taking into account the driving density and the warp yarn tension during the weaving process.

[Solution Means and Action of the Invention]

Accordingly, the present invention provides a process in which the winding diameter of a yarn wound on a beam is calculated by a winding diameter detector from the rotation of the beam, the rotation of the main shaft of the loom, and the driving density. With the winding diameter corrector having as input, at least one of the driving density and the warp tension is used as a parameter, and the correction considering the amount of warp yarn consumption based on the degree of warp of the warp yarn in the woven fabric using the parameter is performed as described above. By correcting the obtained winding diameter, the winding diameter is accurately calculated.

Here, the above correction is performed inside the winding diameter corrector based on, for example, the following correction formula.

R ′ = R (aB + bT + c) Here, the correction coefficients a, b, and c are set empirically in advance in consideration of the warp yarn consumption based on the degree of warp of the warp in the woven fabric, or are experimentally determined by regression analysis or the like. Is set. This winding diameter correction is executed using at least one of the driving density B and the thread tension T as a parameter. For this reason, the correction coefficient a
Any one of the correction coefficient b and the correction coefficient b may be set to 0 corresponding to the parameter not to be corrected.

Embodiment 1 FIG. 1 shows a configuration of a winding diameter detecting device 1.

The winding diameter detector 1 includes a winding diameter detector 2 as a main part.
And a winding diameter corrector 3.

On the input side, the winding diameter detector 2 is connected to a pulse detector 6 of a main shaft 4 of a loom, a pulse detector 7 of a motor 5 for driving a beam, and a driving density setting device 10. The rotation of the motor 5 is transmitted to the beam 9 on the sending side of the yarn 13 via the reduction gear train 8.

The winding diameter corrector 3 is provided on the input side with a winding diameter detector 2.
In addition, the driving density setting device 10 and the warp tension detector 11
It is connected to the.

The winding diameter detector 2 calculates the warp in the beam 9 from the following equation.
The winding diameter (radius) R of 13 is calculated and sent to the winding diameter corrector 3.

m: Reduction gear ratio P _W : Number of rotation pulses on the beam drive side P _L : Number of rotation pulses on the main shaft side of the loom B: Driving density Here, the winding diameter corrector 3 uses, for example, a correction winding diameter (correction) Radius) R 'is calculated.

R '= R (aB + bT + c) a, b, c: correction coefficient T: warp tension Here, after setting correction coefficients a, b, c to appropriate values in advance, various combinations of experiments are performed, and multiple regression analysis is performed. It is experimentally determined by the above.

In the above correction formula, if the correction coefficient a and the correction coefficient b are both values other than 0, both the driving density B and the warp thread tension T are parameters for correction, and corrections for these two parameters are performed simultaneously. Will be. However, when at least one of the driving density B and the yarn tension T is to be corrected as a parameter, the correction coefficient a or the correction coefficient b of the parameter not to be corrected may be set to “0”.

The correction equation may be an equation other than the above, and is generally represented by a function f (B, T), or may be a function f (B) or a function f (T).

Embodiment 2 FIG. 2 shows an example in which the winding diameter detecting device 1 of the present invention is applied to an electric feeding device 12 of a tension control system.

The tension of the warp yarn 13 is detected by the detection unit 15 of the warp yarn tension detector 11 at the position of the tension roll 14, and is input to the tension corrector 16. Here, the tension corrector 16 receives the data of the corrected winding diameter 2R 'as an output from the winding diameter corrector 3, performs a correction operation, and sends the output to the comparison point 17 as a negative signal. The tension corrector 16 corrects the tension signal from the warp tension detector 11 with the correction winding diameter signal 2R '. That is, when the winding diameter of the beam 9 changes, the warp wound around the tension roll 14
Since the winding angle of 13 changes and the resultant direction of the warp load applied to the warp tension detecting unit 15 changes, the output signal of the warp tension detector 11 does not indicate an accurate warp tension value. Therefore, the tension corrector 16 corrects the warp tension from the warp tension detector 11 by using the corrected winding diameter signal 2R '. The winding diameter corrector 3 performs a correction operation according to the following correction expression, and sends the output to the tension corrector 16.

2R '= 2R · f (B, T ₀ ) In this equation, since the target tension T ₀ is not used as a parameter, the correction is executed only for the driving density B.

Here, the comparison point 17 receives the output from the tension corrector 16 and the target tension T ₀ set by the tension setter 18 as inputs, and sends a signal proportional to the deviation to the tension controller 19. Therefore, the tension controller 19 drives the drive amplifier 20 and drives the motor 5 for sending out. The rotation of the motor 5 is fed back to the addition point 21 as a speed feedback signal by a pulse detector 7 such as a pulse generator.

In addition, these warp yarns 13 form an opening by a heald 22 through a tension roll 14, intersect with a weft yarn 23 at the opening position, become a cloth 24, pass through a guide roll 25, a take-up roll 26, and It is wound up by the beam 27.

〔The invention's effect〕

In the present invention, since the winding diameter obtained by the calculation is corrected by using at least one of the driving density and the warp yarn tension as a parameter, the winding diameter can be accurately calculated based on a simple winding diameter calculation. In addition, control characteristics based on the corrected winding diameter can be improved.

In particular, at least one of the driving density and the warp yarn tension is used as a parameter, and a correction taking into account the warp yarn consumption based on the degree of bending of the warp yarn in the woven fabric using them is added to the winding diameter determined by the winding diameter corrector. As a result, it is possible to control the feeding in accordance with the degree of bending of the warp yarn.

[Brief description of the drawings]

FIG. 1 is a block diagram of a winding diameter detecting device of the present invention, and FIG. 2 is a block diagram of an example in which the winding diameter detecting device of the present invention is applied to a feeding control device. DESCRIPTION OF SYMBOLS 1 ... Winding diameter detecting device, 2 ... Winding diameter detector, 3 ... Winding diameter corrector, 4 ... Spindle of loom, 5 ... Motor, 6, 7 ... Pulse detector, 8 ... Reduction gear Row, 9 ... Beam, 10 ...
Driving density setting device, 11 ... warp tension detector.

Claims (1)

(57) [Claims] A winding diameter detector for calculating a winding diameter of a yarn wound around a delivery beam from a rotation of a delivery beam, a rotation of a main shaft of a loom, and a driving density. At least one of the parameters is a parameter, and a winding diameter corrector for adding a correction considering the warp yarn consumption based on the degree of warp of the warp yarn in the woven fabric using the parameter to the obtained winding diameter is provided. Loom winding diameter detection device.