JPS61201051A - Control of weft yarn length measuring apparatus in shuttleless loom - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a weft length measuring device for a shuttleless loom, and more particularly to a method for controlling the drive of a feed roller of the weft length measuring device.

[Prior art 1] In general, in a shuttleless loom, a certain length of weft is left in a free state and stored between the end of a weft insertion movement and the start of the next weft insertion movement, and this stored weft is used for the next weft insertion. It is released all at once during the weft insertion movement, allowing for rapid weft insertion. In addition, if the length of the stored yarn is made to be equal to the width of the fabric, the length of the stored yarn will become quite long and management to prevent the stored yarn from getting tangled will be complicated. In order to obtain the thread length of the offal width by the sending-out length and the stored weft length, the thread is continuously drawn out from the thread supply source and continuously sent to the weft storage section.

In this way, the shuttleless m8 system releases the stored weft yarns at the appropriate time and sends out the weft yarns continuously! In this case, the continuous feed-out amount of the weft must be changed due to changes in the fabric width, change in the weft-inserting movement time, etc., and a weft length measuring device that can change the feed-out amount in a timely manner is required.

A typical shuttleless loom equipped with such a weft length measuring device is, for example, as shown in Figure tJS3.
is passed through the tensioning device 2, then measured by the weft length measuring device t3, and the measured weft Y is stored by a certain length in the weft storage device 5 by an air flow injected from the weft storage injection nozzle 4. There is a system in which the stored weft is released from the weft holding by the weft holding device 7 during the weft insertion movement and is discharged all at once into the warp opening 9 through the guide 6 by the weft jetting action of the weft insertion nozzle 8.

In this weft yarn length measuring device 3, in order to change the amount of weft yarn to be fed out, as disclosed in Japanese Utility Model Application Publication No. 55-48624, a roller 10 is attached to the shaft 11 for winding. A driven roller 12 that moves in the axial direction independently of the roller 10 is provided in contact driving relationship with a drive drum 13 that is driven by a common drive motor (not shown) with the machine base; By adjusting the position changing means (not shown) for the driven roller 12, the winding can maintain the row 210 in a suitable position while adjusting its rotational speed to a desired value. However, this weft length measuring device 3
Then, when the amount of change in the width of the fabric is large, it is not possible to cope with the change in the width of the fabric simply by adjusting the position of the driven roller 12, and it is not only necessary to prepare a large number of drive drums 13 with different diameters, but also to adjust the width of the fabric. The replacement work is complicated. In order to eliminate the complexity of such work, the drive drum 1
3 may be driven by a motor separate from the machine base motor, instead of being driven by a common drive motor with the machine base. However, when such a separate motor drive method is adopted, the rotational speed of the drive drum 13 cannot correspond to the rotation of the loom when there is a fluctuation in the rotation of the loom during operation of the loom.

[Problems to be Solved by the Invention] Therefore, in the conventional weft length measuring device, irregularities occur in the weft length measurement due to fluctuations in machine rotation, and when the weft is inserted, the length of the weft ends varies, for example. If the yarn end is long, it becomes wasted yarn, and if it is short, it results in a weft insertion error, which has a major impact on the weaving function. It is an object of the present invention to provide a control method for a weft length measuring device that quickly solves these problems.

[Means and effects for solving the problem] For this purpose, the control method of the weft length measuring device according to the present invention includes driving the feed roller for supplying the weft of the weft length measuring device with a variable speed motor that is separate from the machine motor. The actual rotation speed of the machine motor is measured, an increase or decrease from the set rotation speed is calculated, and the rotation speed of the variable speed motor is controlled in response to the calculated value.

In this way, the feed roller for weft supply is driven by a separate variable speed motor, so when changing the weave width, it is only necessary to change the rotation speed of the variable speed motor to adapt to the changed weave width. It is very easy to change the weaving width, and since the speed of the variable speed motor is synchronized with the rotation speed of the machine motor, even if the rotation speed of the machine motor changes during #&Iso operation. , a situation where the weave width becomes short does not occur.

[Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or corresponding parts.

FIG. 1 shows a perspective view of a weft length measuring device embodying the present invention. In the figure, a weft storage nozzle 4, an air bubble type weft storage device 5, a guide 6, a weft holding device 7, a weft thread insertion/ 7: The row 8 and the winding row 210 can be considered to be similar to those of the prior art described above.

In the weft length measuring device implementing the present invention, a cylindrical feed roller 1 receives the weft Y from a yarn supply source (not shown).
The shaft 15 of No. 4 is coupled to a variable speed motor 16. The variable speed motor 16 is separate from a machine motor 20 that drives, for example, a slay 19 to which a reed 17 and a weft guide member 18 are attached in a well-known manner. In order to perform control according to the present invention, the variable speed motor 16 includes a drive circuit 21,
It is connected to the arithmetic circuit 22 and the rotation speed setting device 23,
Further, a rotation detector 24 for detecting the rotation speed of the machine motor 20 described above is connected to the arithmetic circuit 22 via a Δ/D converter 25. The above-mentioned elements 21, 22, 23, 24 and 25 used in carrying out the present invention may all be well-known, and their configurations themselves are not the gist of the present invention, so their explanation will be omitted. .

Now, weaving width L = 180cm, 5m range, rotation speed Vm-600
rpm.

Assuming that the diameter D of the feed roller 14 is 6 cm, the rotation speed vf of the feed roller 14 is as follows: Vf=L XVm/ x X D = 180X 600X yr X 6 = 5730
rpm. This initial setting value of 5730 rpm is input to the calculation circuit 22 by the rotation speed setting device 23, and the drive circuit 2
1 to the variable speed motor 16 at this rotation speed of 5730 rpm.
Drive with.

On the other hand, the speed of the machine base motor 20 that drives the machine base at a rotational speed V+n=600 rpm changes in response to fluctuations in the power supply and the like. For example, even though the rotation speed of the machine motor 20 has increased by 5% to 630 rpm, the feed roller 1
Assuming that the rotation speed of 4 does not change, the weaving width is L = VfX yr X D / Vm = 5730X
Since yr x 6 / 630 = 171.4 cm, which is 8.6 cm shorter, a well-known weft detection device detects this abnormality and the machine stops.

Therefore, in the present invention, the rotation speed of the foot roach 14 is changed at a rate corresponding to the change in the rotation speed of the machine base, that is, at a rate of 5% in the example assumed above. For this purpose, the rotation detector 24 detects the actual rotation speed of the machine motor 20, and the detected rotation speed signal is converted into a digital value by the ^/D converter 25, and then sent to the arithmetic circuit 22.
, where it is compared with the initial setting value described above.

As a result of the comparison, if the actual rotation speed of the machine motor 20 has increased by 5% as described above, the arithmetic circuit 22 increases the rotation speed of the feed roller 14 to the initial setting value + 5%, that is, Vf.
= 6017 rpm and instructs the variable speed motor 16 via the drive circuit 21 to drive the feed roller 14 at this speed. In this way, the feed roller 14 responds to the variation in the rotational speed of the machine motor 20 to achieve Vf = 601.
Since it is driven at 7r+on, the weaving width is L = VfX yr X D / Vm = 6017X
yr x 6 / 630 = 180 cm, which gives an appropriate value.

The above describes the case where there is a change in the rotation speed during machine operation, 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 is changed to the rotation speed. It is possible to set the speed using the setting device 23 and easily drive the variable speed motor 16 at the set rotation speed.

In the above embodiment, the weft length measuring device implementing the present invention was of a type having an air pool type weft storage device 5, but the present invention can be implemented in weft length measuring devices of other machines. For example, it may be as shown in FIG.

That is, the weft yarn Y of the yarn feeding bobbin 1 passes through the id 36 and is pulled out by a known length measuring roller 30. Measuring roller 30
consists of a pair of rollers, including a drive roller that is continuously rotated by a variable speed motor 16 that is separate from the machine motor 20, and a driven roller that is pressed against the drive roller. Measuring roller 3
The weft yarn sent out from the weft yarn is sprayed by fluid jetted from the weft storage jet nozzle 4 onto the storage surface 32 of the rotating belt 31 disposed in front of the nozzle 4. The storage surface 32 is composed of a member such as a moquette in which fibers or fibrous materials are planted, and the weft yarn sprayed by the nozzle 4 is caught between the fibers, and the spray is maintained at the position due to the frictional resistance between them. be done. The rotating belt 31 is stretched around a pair of rollers 33 and 34, and one roller 33 is driven by a variable speed motor 37 via a rotation transmission member 35. The weft stored in a meandering manner on the storage surface 32 passes through the id 6 and passes through the weft insertion nozzle 8 when the weft holding device 7 is released.
The weft is inserted into the weft guide passage of the idle member 18. Here, the variable speed motors 16 and 37 are the machine motor 20
The drive is controlled in accordance with the present invention in the manner described in the above embodiment. That is, the machine motor 20
Based on the result calculated by the calculation circuit 22 according to the rotation speed fluctuation, the speed of the variable speed motor 16 is changed via the drive circuit 21, and the speed of the variable speed motor 37 is changed via the drive circuit 38, so that the rotation of the machine motor 20 is always maintained. Appropriate weft length measurement according to the number of
A storage operation can be performed.

[Effects of the Invention] As described above, according to the present invention, the feed roller of the weft length measuring device is driven by a variable speed motor that is separate from the machine base motor, and the variable speed motor responds to speed fluctuations of the machine base motor. Since the rotation is controlled by the machine, it is extremely easy to change the weaving width, and even if the rotational speed of the loom varies during weaving, a woven fabric with the appropriate line width can be obtained without any problems. .

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a weft length measuring device implementing the present invention, FIG. 2 is a perspective view showing another example of a weft length measuring device implementing the present invention, and FIG. 3 is a perspective view showing an example of a weft length measuring device implementing the present invention. FIG. 2 is a perspective view showing a long device. Y...H yarn 14-feed roller 16...variable speed motor 20...machine motor 21
...Drive circuit 22...Arithmetic circuit 23...
Rotation speed setting device 24...Rotation detector Applicant Toyoda Automatic Oriiso Manufacturing Co., Ltd. Figure 1

Claims (1)

[Claims] The weft supply feed roller of the weft length measuring device is driven by a variable speed motor separate from the machine motor, the actual rotation speed of the machine motor is measured, and an increase or decrease with respect to the set rotation speed is calculated,
A method for controlling a weft length measuring device in a shuttleless loom, the method comprising controlling the rotation speed of the variable speed motor in response to the calculated value.