JPH0635693B2 - Control method of weft measuring device in shuttleless loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weft measuring device in a shuttleless loom, and more particularly to a method for controlling driving of a feed roller of the weft 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 storage yarn length for one pick is made equal to the fabric width length as it is, the storage yarn length becomes considerably long and the management such as the entanglement prevention of the storage yarn may become complicated, thus releasing the storage weft yarn. Sometimes the weft yarn is further sent out, and the yarn from the yarn supply source is continuously drawn out in order to obtain a yarn length corresponding to the fabric width by the sent-out length and the stored weft length.
The yarn is continuously fed to the weft storage section.

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. 4, a weft Y drawn from a yarn supplying bobbin 1 serving as a yarn supply source is tensioned. Pass it through the applicator 2, then measure it with the weft measuring device 3,
The measured weft Y is stored for a certain length in the weft storage device 5 by the air flow jetted from the weft storage jet nozzle 4, and the stored weft is released from the weft holding device 7 during weft insertion movement. In some cases, the weft insertion nozzle 8 discharges 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 Y to be sent out, as disclosed in Japanese Utility Model Laid-Open No. 55-46624, the winding shaft 10 is wound around a mounting shaft 11 to which the winding roller 10 is attached. A driven roller 12 that can move in the axial direction independently of the 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). The position of the winding roller 10 can be adjusted to a desired value while adjusting the position of the winding roller 10 by adjusting the position changing means (not shown).
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 the complexity of such work, drive drum
It is conceivable that the 13 is not driven by a drive motor common to the machine base, but is driven by a speed change motor different from the machine motor. However, if such a different motor drive system is adopted, when the speed change motor is stopped by the stop signal of the machine base, the machine base operates at a predetermined angle under the action of the brake, that is, at the next start start angle. On the other hand, the drive drum stops earlier than the machine base, mainly due to inertia. Therefore, the weft measuring device stops without storing a predetermined length of weft for one pick,
Since the accumulated yarn length is insufficient with respect to the weaving width, restarting the machine base will result in weft insertion error.

[Problems to be Solved by the Invention] Therefore, the weft measuring device of such a system has a problem that the accumulated yarn length is insufficient each time the machine stand is stopped and a weft insertion error occurs at the next weft insertion. . 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 for Solving the Problems] To this end, in the control method of the weft yarn length measuring device according to the present invention, a variable speed motor, which is separate from the machine base motor, has a desired number of revolutions and 1
The number of rotations for pick is instructed, the feed roller for supplying the weft of the weft length measuring device is driven by the speed change motor operated under the instructed number of rotations, and the machine stand motor is stopped by the machine stand stop signal. The machine stop signal is transmitted to the speed change motor, and after the machine speed stop signal is received, the speed change motor is rotated by the number of rotations of one pick and stopped.

[Operation] As described above, the rotation speed of one pick is designated for the speed change motor that drives the feed roller for supplying the weft thread, and even if the speed change motor receives the machine stand stop signal, the speed of the speed change motor is rotated by one pick. Stops after reaching the total number of revolutions corresponding to the minute weft length. Therefore, at the time of re-mobilization, the speed change motor also rises from the position of the next preferable starting start angle like the machine base motor, so that the reserved yarn length does not become insufficient. Moreover, in the preferred embodiment, when changing the woven fabric, it is only necessary to change the setting of the rotation speed of the transmission motor so as to adapt to the changed woven width, which makes it very easy to change the woven width.

[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, control circuit 22, initial speed setting device 23, rotation detector 26, A
The rotation detector 24, which is connected to the A / D converter 27 and the rotation speed setting device 28 for one pick, detects the rotation speed of the machine base motor 20 described above, and the control circuit 22 via the A / D converter 25. It is connected to the. All of the above-mentioned various elements 21 to 28 used in the embodiment of the present invention may be well-known ones, and the configuration of these is not the gist of the present invention.
The description is omitted.

Now, assuming that the weaving width L = 180 cm, the machine base rotation speed Vm = 600 rpm, and the diameter D of the feed roller 14 = 6 cm, the rotation speed Vf of the feed roller 14 is Vf = L × Vm / π × D = 180 × 600 / π X6 = 5730 rpm. This initial setting value of 5730 rpm is input to the control circuit 22 by the rotation speed setting device 23, and the speed change motor is supplied via the drive circuit 21.
16 is driven at this rotation speed of 5730 rpm. In addition, the control circuit 22
The feed roller rotation speed for one pick determined based on the weaving width L, the diameter D of the feed roller 14 and the like is input to the control circuit 22 via the rotation speed setting device 28. 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 motor 14 has not changed 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 /Vm=5730×π×6/630=171.4 cm, which is also shortened by 8.6 cm, and the well-known weft detecting device detects this abnormality, and the machine base stops.

Therefore, in the embodiment of the present invention, the number of rotations of the feed roller 14 is changed at a rate corresponding to the change in the number of rotations of the machine base, that is, at a rate of 5% in 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 input to the control circuit 22 after being converted into a digital value by the A / D converter 25. Then, the value is compared with the initial setting value of the machine base motor speed described above. As a result of the comparison, if the actual rotation number of the machine base motor 20 is increased by 5% as described above, the control circuit
22 calculates the rotation speed of the feed roller 14 at the initial setting value + 5%, that is, Vf = 6017 rpm, and at this speed, the feed roller 14
To drive the shift motor 16 via the drive circuit 21. In this way, the feed roller 14 is driven at Vf = 6017 rpm in response to the change in the rotation speed of the machine base motor 20,
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 the rotation speed fluctuates during machine operation, but it is obvious to those skilled in the art that even when the weaving width is changed, the speed of the shift motor corresponding to the change is set to the rotation speed. The speed can be set by the setter 23 and the transmission motor 16 can be easily driven at the set rotational speed.

Next, in FIG. 1 and FIG. 2, when the machine standstill signal is output at time t ₁ , the machine stand motor 20 receives the stop signal in a normal manner as shown in a) of FIG. The power is cut off, and the machine base is stopped at time t ₂ .

On the other hand, the machine stop signal is also transmitted to the transmission motor 16 for the feed roller 14. At that time, the transmission motor 16 is cut off from the power source, but if the transmission motor 16 remains disconnected,
Will stop at a very early time t _{3 as} shown by the dotted line in b) of FIG. 2, resulting in the inconvenience of the shortage of the storage yarn length as described above. Therefore, in the embodiment of the present invention, the rotation detector 26 is provided on the transmission motor 16 or the feed roller 14.
Are related to each other, and d) in FIG. 2 detected by the rotation detector 26.
The feed roller rotation detection signal of is converted into a digital value by the A / D converter 27 and input to the control circuit 22, and the rotation speed setter 28 inputs the feed roller rotation speed for one pick to the control circuit 22. . When the machine stop signal is input to the control circuit 22, the control circuit 22 starts counting the feed roller rotation detection signal. At the time when an appropriate predetermined time t ₄ has passed from the generation of the machine stop signal, the control circuit
A re-driving signal is transmitted from 22 to the driving circuit 21, and b) in FIG.
As shown by, the variable speed motor 16 is driven by a constant voltage V ₂ which is lower than the steady-state drive voltage V ₁ . FIG. 2 (c) shows the change in the rotation speed (rpm) of the feed roller transmission motor 16 at this time.

If known voltage V ₁ and V _2, can be time t ₅ also predict up to the cumulative number of revolutions and the feedroll 14 of the feed roller 14 up to the time t ₄ has elapsed reaches a cumulative number of rotations of 1 picks min Therefore, by pre-programming these values in the control circuit 22 or by a well-known timer, the re-driven transmission motor 16 can be driven for a predetermined time t without depending on the rotation detection signal of the feed roller. It can be controlled to stop at ₅ . Even when the voltages V ₁ and V ₂ fluctuate, the rotation detector 26 detects the rotation speed of the feed roller 14 and transmits it to the control circuit 22, and the total rotation speed of the feed roller for one pick is controlled. Since the circuit 22 is set, the control circuit 22 can stop the rotation of the feed roller transmission motor 16 at a suitable time t ₅ .

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 different from the machine base motor 20 in the speed change motor 16
Is composed of a driving roller that continuously rotates and a driven roller that is pressed against the driving roller. The weft yarn sent out from the length measuring roller 30 is rotated by the rotating belt 31 disposed in front of the weft storage jet nozzle 4 due to the fluid jetted from the weft yarn jet nozzle 4.
It is sprayed on the storage surface 32 of. The storage surface 32 is composed of a member in which fibers or fibrous materials are planted, such as a moquette.
The weft yarn sprayed by the nozzle 4 is sandwiched between the fibers and is maintained at the spraying position by the frictional resistance with the fibers. 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 are drive-controlled according to the present invention in the manner described in the above embodiment with the machine base motor 20. That is, a one-pick rotation number setting device 39 for the speed change motor 37 is also provided, and in response to a machine stop signal, the control circuit 22 controls the speed change motor 16 via the drive circuit 21 and a drive circuit. Control the variable speed motor 37 via 38
It is possible to perform an appropriate weft storage operation in synchronization with the stop of 20.

The speed change motor may be a servo motor or an electromagnetic brake, and if an inverter is used, the feed roller may be driven at a low rotation speed by frequency conversion.

EFFECTS OF THE INVENTION As described above, according to the present invention, the feed roller of the weft length measuring device is driven by the speed change motor that is separate from the machine base motor, and the stop of the speed change motor by the machine base stop signal is Since the feed roller is controlled so that it is performed after the total number of revolutions for one pick is reached, there is no shortage of weft insertion length at the start of the next weft insertion after the machine stand is stopped, and there is no weft insertion error. Weaving can be realized. Moreover, it is extremely easy to change the weaving width.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a weft length measuring apparatus for carrying out the present invention, a) to d) of FIG. 2 are views showing the time relation of various signals in the embodiment of FIG. 1, and FIG. FIG. 4 is a perspective view showing an example of another weft length measuring device embodying the present invention, and FIG. 4 is a perspective view showing a conventional weft length measuring device. Y: weft, 14: feed roller 16: speed change motor, 20: machine base motor 21: drive circuit, 22: control circuit 24: rotation detector, 26: rotation detector 23: initial Rotation speed setting device 28 …… Rotation speed setting device for 1 pick

Claims (1)

[Claims] 1. A weft supply device for a weft yarn length measuring device by instructing an initial rotation speed and a rotation speed for one pick to a speed change motor separate from a machine base motor, and operating the speed change motor under the specified speed conditions. Drive the feed roller for the machine to stop the machine frame motor by the machine frame stop signal, transmit the machine frame stop signal to the shift motor, and the shift motor receives the machine frame stop signal for one pick A method for controlling a weft measuring device in a shuttleless loom, which is rotated by the number of revolutions and stopped.