JPH0811852B2 - Control method of weft measuring device in shuttleless loom - Google Patents

Description

TECHNICAL FIELD The present invention relates to a weft length measuring device in a shuttleless loom, and particularly to a method for controlling driving of the weft length measuring device.

[Prior Art] Generally, in a shuttleless loom, when a weft insertion motion is completed, a certain length of weft yarn is stored in a free state until the next weft insertion motion is performed. It is released all at once during the weft insertion movement, enabling rapid weft insertion. Further, if the stored yarn length is made equal to the fabric width length as it is, the stored yarn length becomes considerably long, and management such as entanglement prevention of the stored yarn may become complicated. The yarn from the yarn supply source is continuously drawn out and continuously fed out to the weft storage portion in order to obtain the yarn length of the fabric width by the delivery length and the stored weft yarn length.

In this way, the shuttleless loom of the system that discharges the stored weft yarns in a timely manner and further continuously feeds out the weft yarns is not possible because of the relations such as changing the width of the fabric and the time of the weft inserting motion. It must be changed, and a weft length measuring device capable of changing the delivery amount at this time is required.

As a typical shuttleless loom equipped with such a weft length measuring device, for example, as shown in FIG.
The weft Y drawn from the yarn supply bobbin 1 which is the yarn supply source is passed through the tension applying device 2, and then measured by the weft measuring device 3, and the measured weft Y is jetted from the weft storage jet nozzle 4. Is stored in the weft storage device 5 for a certain length by the air flow, and the stored weft yarn is stored in the weft holding device 7 during the weft inserting movement.
In some cases, the weft holding is released and the weft insertion nozzle 8 discharges it all at once through the guide 6 into the warp opening 9.

In this weft length measuring device 3, in order to change the amount of weft delivered, as disclosed in Japanese Utility Model Laid-Open No. 55-46624, a mounting shaft 11 to which a winding roller 10 is attached,
A driven roller 12 that can move in the axial direction independently of the winding roller 10 is provided in a contact drive relationship between the machine base and a drive drum 13 driven by a common drive motor (not shown), Position changing means (not shown) for the driven roller 12
With the adjustment, the rotation speed of the winding roller 10 can be adjusted to a desired value while the winding roller 10 is maintained at a suitable position. However, in the case of the weft yarn length measuring device 3, when the change amount of the fabric width is large, the change of the fabric width cannot be dealt with only by adjusting the position of the driven roller 12, and a large number of drive drums 13 having different diameters must be prepared. Not only that, but also the work of replacing the drum 13 is complicated. In order to eliminate such complexity of work, it is conceivable that the drive drum 13 is not driven by a drive motor common to the machine base, but is driven by a motor different from the machine motor. However, if such another motor drive system is adopted, the rotation speed of the drive drum 13 cannot cope with the rotation of the machine base when the rotation of the machine base changes during the operation of the loom.

[Problems to be Solved by the Invention] Therefore, in the conventional weft length measuring device, variations in the machine base rotation cause unevenness in the weft length measurement, and when the weft is inserted, the lengths of the weft ends vary, For example, if the yarn end is long, it will be wasted yarn,
In addition, when the length is short, weft insertion errors occur, which has a significant effect on the weaving function. SUMMARY OF THE INVENTION It is an object of the present invention to provide a control method for a weft length measuring device that can quickly solve such a problem.

[Means and Actions for Solving Problems] To this end, in the control method of the weft length measuring device according to the present invention, the weft length measuring device is controlled by a variable speed motor separate from the machine frame motor. Rotated at a set rotation speed set based on the set rotation speed, during operation of the shuttleless loom,
The actual rotation speed of the machine base motor is measured by the rotation detection unit,
The measured value is compared with the set rotational speed of the machine motor by an arithmetic circuit to calculate the relationship of the measured value with respect to the set rotational speed, and the calculated value is output to the drive circuit of the shift motor, and the same arithmetic operation is performed. The rotational speed of the transmission motor is controlled to be changed according to the value.

Since the weft measuring device is driven by a separate gear shifting motor in this way, when changing the weaving width, it is only necessary to change the setting of the rotation speed of the gear shifting motor so as to adapt to the changed weaving width.
It is very easy to change the weaving width, and the rotation speed of the speed change motor is synchronized with the rotation speed of the machine base motor. Therefore, even if the rotation speed of the machine base motor fluctuates during operation of the loom, Nothing happens so that is shortened.

[Embodiment] Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding portions.

FIG. 1 is a perspective view of a weft length measuring device embodying the present invention. In the drawing, a weft storage nozzle 4, an air pool type weft storage device 5, a guide 6, a weft holding device 7, a weft insertion nozzle. 8 and winding roller 10 may be considered similar to those of the prior art described above. In the weft length measuring apparatus embodying the present invention, the shaft 15 of the cylindrical feed roller 14 that receives the weft Y from a yarn supply source (not shown) is connected to the speed change motor 16. The transmission motor 16 is separate from a machine base motor 20 that drives, for example, a sley 19 having a reed 17 and a weft guide member 18 mounted thereon in a known manner. In order to perform the control according to the present invention, the variable speed motor 16 is driven by the drive circuit 2
1, connected to the arithmetic circuit 22 and the rotation speed setting device 23,
A rotation detector 24 that detects the rotation speed of the machine base motor 20 described above is connected to the arithmetic circuit 22 via an A / D converter 25. The above-mentioned various elements 21, 22, 23, 24 and 25 used in the implementation of the present invention may all be well-known ones, and the configuration thereof is not the gist of the present invention, and thus the description thereof is omitted. .

Now, assuming that the weaving width L is 180 cm, the machine speed Vm is 600 rpm, and the diameter D of the feed roller 14 is 6 cm, the feed roller 14 is
The rotation speed Vf of V is Vf = L × Vm / π × D = 180 × 600 × π × 6 = 5730 rpm. This initial setting value of 5730 rpm is input to the arithmetic circuit 22 by the rotation speed setting device 23, and the transmission motor 21
16 is driven at this rotation speed of 5730 rpm. On the other hand, the speed of the machine base motor 20 that drives the machine base at the rotation speed Vm = 600 rpm changes in response to fluctuations in the power supply and the like. For example, assuming that the rotation speed of the feed roller 14 does not change even though the rotation speed of the machine base motor 20 has increased by 5% to 630 rpm, the weaving width L is L = Vf × π × D Since / Vm = 5730 x π x 6/630 = 171.4 cm, which is 8.6 cm shorter, the weft detector of the cycle detects this anomaly and the machine base stops.

Therefore, in the present invention, the rotation speed of the feed roller 14 is changed at a ratio corresponding to the change in the rotation speed of the machine base, that is, 5% in the case of the example assumed above. Therefore, the rotation detector 24 detects the actual rotation speed of the machine base motor 20, and the detected rotation speed signal is the A / D converter 2
After being converted into a digital value in 5, it is input to the arithmetic circuit 22 where it is compared with the above-mentioned initial setting value. As a result of comparison, the actual rotation speed of the machine base motor 20 is 5 as described above.
%, The arithmetic circuit 22 calculates the rotation speed of the feed roller 14 at the initial setting value + 5%, that is, Vf = 6017 rpm, and drives the feed roller 14 at this speed through the drive circuit 21. Command the variable speed motor 16. In this way, the feed roller 14 responds to fluctuations in the rotation speed of the machine base motor 20.
Since it is driven at Vf = 6017 rpm, the weaving width L is L = Vf × π × D / Vm = 6017 × π × 6/630 = 180 cm, and an appropriate value is obtained.

The above describes the case where there is a change in the number of revolutions during operation of the machine base, but as is obvious to those skilled in the art,
Even when the weaving width is changed, the speed change motor rotation speed corresponding to the change can be set by the rotation speed setting device 23, and the speed change motor 16 can be easily driven at the set rotation speed.

In the above embodiment, the weft length measuring device for carrying out the present invention is of the type having the air pool type weft yarn storage device 5, but the present invention can be applied to various other weft length measuring devices. , As shown in FIG.

That is, the weft yarn Y of the yarn supplying bobbin 1 is pulled out by the known length measuring roller 30 via the guide 36. The length measuring roller 30 is composed of a pair of rollers, and is a speed change motor different from the machine base motor 20.
It is composed of a driving roller that continuously rotates by 16 and a driven roller that is pressed against the driving roller. The weft sent out from the length measuring roller 30 is a rotating belt arranged in front of the weft storage jet nozzle 4 by the fluid jetted from the nozzle 4.
It is sprayed on the storage surface 32 of 31. The storage surface 32 is composed of a member in which fibers or fibrous materials are planted, such as a moquette, and the weft yarn sprayed by the nozzle 4 is sandwiched between the fibers and is maintained at the spraying position due to frictional resistance with the fibers. To be done. The rotary belt 31 is stretched around a pair of rollers 33 and 34, and one roller 33 is driven by a transmission motor 37 via a rotation transmission member 35. The weft yarn stored in the meandering shape on the storage surface 32 passes through the guide 6 and is inserted into the weft guide passage of the weft guide member 18 by the weft insertion nozzle 8 when the weft holding device 7 is released. Here, the variable speed motors 16 and 37
Is driven and controlled according to the present invention in the manner described in the above embodiment with the machine motor 20. That is,
Based on the result calculated by the arithmetic circuit 22 according to the variation in the rotation speed of the machine base motor 20, the speed change motor 16 is changed through the drive circuit 21 and the speed change motor 37 is changed through the drive circuit 38 to constantly change the machine base. Appropriate weft length measurement according to the number of rotations of the motor 20,
A storage operation can be performed.

EFFECTS OF THE INVENTION As described above, according to the present invention, the weft length measuring device is driven by a speed change motor that is separate from the machine base motor, and the speed change motor rotates in response to speed fluctuations of the machine base motor. Since the control is performed, it is extremely easy to change the weaving width,
Even if the rotation speed of the machine base fluctuates during operation, a woven cloth having an appropriate weaving width can be obtained, and no problem occurs.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a weft measuring device embodying the present invention, FIG. 2 is a perspective view showing an example of another weft measuring device embodying the present invention, and FIG. 3 is a conventional weft measuring device. It is a perspective view showing a long device. Y ... weft, 14 ... feed roller, 16 ... speed change motor, 20 ... machine motor, 21 ... drive circuit, 22 ... arithmetic circuit, 23 ... rotation speed setting device, 24 ... rotation detector , 37 …… Variable speed motor.

Claims (1)

[Claims] 1. A method of controlling a weft length measuring device in a shuttleless loom, wherein the weft length measuring device is set based on a set rotation speed of the machine base motor by a variable speed motor separate from the machine base motor. The machine is driven to rotate at the set rotation speed, and the actual rotation speed of the machine base motor is measured by a rotation detector during operation of the shuttleless loom, and the measured value is calculated by the arithmetic circuit to the set rotation speed of the machine base motor. Compute the relationship of the measured value with respect to the set rotation speed in comparison with the calculated value, output the calculated value to the drive circuit of the speed change motor, and change and control the rotation speed of the speed change motor according to the calculated value. Control method for weft measuring device in shuttle loom.