JPS61225351A - Control of weft yarn length measuring apparatus in shuttleless loom - Google Patents

Abstract

(57) [Summary] 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 #a thread, and more particularly to a method for controlling the drive of a feed roller of the weft length measuring device.

[Prior Art] In general, in a shuttleless loom, a certain length of weft is stored in a free state 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 for one pick is made equal to the width of the fabric, the length of the stored yarn becomes quite long (which may make management such as preventing entanglement of the stored yarn complicated), and the length of the stored weft. At the time of discharge, the weft 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 sending out and the stored weft length,
The yarn is continuously sent to the weft storage section. .

In this type of shuttleless machine, which releases the stored weft yarns at the appropriate time and then continuously sends out the weft yarns, the amount of continuous weft yarns that can be fed out is limited due to changes in the fabric width, changes in the weft insertion movement time, etc. Therefore, a weft length measuring device that can change the feed 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 5, number 2.
The weft yarn Y pulled out from the yarn feeding pobbin 1, which is a yarn supply source, is passed through the tension applying device 2, then measured by the weft length measuring device 3, and the measured weft yarn Y is passed through the weft yarn storage injection nozzle 4. A certain length of the stored weft is stored in the weft storage device 5 by the injected air flow, and the stored weft is transferred to the weft holding device 7 during the weft insertion movement.
At the same time, the weft yarn is released from being held, and the weft yarn is discharged all at once into the warp opening 9 through the weft 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 Y to be fed out, as disclosed in Japanese Utility Model Application Publication No. 55-48824, the winding is carried out by attaching a roller 10 to the shaft 11. For winding, a driven roller 12 that can move in the axial direction independently of the roller 10 is driven by a drive motor (
By adjustment of repositioning means (not shown) for the driven roller 12, the winding maintains the roller 10 in a preferred position. The rotation speed can be adjusted to a desired value while the machine is in use. However, in this weft length measuring device 3, when the amount of change in the fabric width is large, the driven row 21
Adjustment of the position of the drum 13 alone cannot correspond to changes in the width of the fabric, and it is not only necessary to prepare a large number of drive drums 13 having different diameters, but also the work of replacing the drums 13 is complicated.

In order to eliminate the complexity of such work, it is conceivable to drive the drive drum 13 not by a common drive motor with the machine base, but by a variable speed motor separate from the machine base motor. However, if such a separate motor drive system is adopted, when the variable speed motor is stopped by a stop signal from the machine base, the machine base will move at a predetermined angle under the action of the brake, that is, at the next starting start angle. whereas l1 stops
The lJb drum stops earlier than the machine table mainly due to inertia, so the weft length measuring device stops without storing the predetermined length of weft for one pick, and the weft width Since the stored yarn length is insufficient, restarting the machine will result in a forest entry error.

[Problem to be Solved by the Invention 1] Therefore, with this type of weft length measuring device, there is a problem that the stored yarn length is insufficient every time the machine is stopped, resulting in a weft insertion error at the next weft insertion. 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 for Solving the Problems] For this purpose, the control method for the weft length measuring device according to the present invention includes an initial rotation speed and a rotation speed for one pick (a) in a variable speed motor that is separate from the machine motor. The variable speed motor, which is operated under the specified rotational speed conditions, drives the weft supply feed roller of the weft length measuring device, and the machine motor and variable speed motor are stopped by a machine stop signal, and the machine Measure the actual number of revolutions (b) that the variable speed motor rotates from the time it receives the stop signal until it stops, and calculate the difference in the number of revolutions (a) - (b) until the start of weft insertion when starting the machine. ), the rotation start time of the variable speed motor is controlled so that the variable speed motor rotates by the amount of rotation.

[Operation] In this way, the speed change motor that drives the weft supply feed roller is instructed to have the rotation speed a for one pick. When the variable speed motor receives the machine stop signal, the total rotational speed of the variable speed motor stops before reaching the rotational speed a corresponding to the weft length of one pick. However, this cumulative number of rotations is memorized, and when restarting, the rotation start time of the variable speed motor is controlled so that the variable speed motor rotates by the difference in the number of rotations a-b before weft insertion starts. . Therefore, like the machine base motor, the variable speed motor also starts up from the position of the next suitable starting angle, so there is no shortage of stored yarn length. Furthermore, in the preferred embodiment, 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, making it very easy to change the weave width.

1 Embodiment] Next, a preferred embodiment 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 an overall configuration diagram of an apparatus for implementing the control method of the present invention, and in the figure, a weft storage nozzle 4, an air pool type weft storage device 5, a guide 6, a weft holding device 7,
The weft insertion nozzle 8 and the winding row 210 may be considered to be similar to those of the prior art described above. In the weft length measuring device embodying the present invention, a pongee 15 of a cylindrical feed roller 14 that receives a weft Y from a yarn supply source (not shown) is connected to a variable speed motor 16. The variable speed motor 16 is, for example, I
Slay 1 with t17 and weft guide member 18 attached
It is separate from the machine motor 20 that drives the motors 9 and the like in a well-known manner. In order to control according to the present invention, the variable speed motor 16 includes a drive circuit 21, a control circuit 22, an initial rotation speed setter 23, a rotation detector 26, and a ^/D converter 2.
7 and 1 pick rotation speed setting device 28,
Further, a rotation detector 24 for detecting the rotation speed of the machine motor 20 described above is connected to the control circuit 22 via a ^/D converter 25. The above-mentioned elements 21 to 28 used in the embodiments of the present invention may all be well-known, and their configurations are not the gist of the present invention, so a description thereof will be omitted.

Now, weaving width L = 180cm, machine rotation speed Vm = = 6
00rpm1 Diameter of feed roller 14 D = 6cIIl
Then, the rotation speed vf of the feed roller 14 is: Vf=L
m. This initial setting value of 5730 rpm is inputted to the control circuit 22 by the rotation speed setter 23, and the variable speed motor 16 is driven at this rotation speed of 5730 rpm+ via the drive circuit 21.

Further, the feed roller rotation speed for one pick, which is determined based on the weaving width, the diameter of the feed roller 14, etc., is input to the control circuit 22 via a rotation speed setting device 28. On the other hand, the machine rotation speed V = 600r
The speed of the machine motor 20 driven by the plow changes in response to fluctuations in the power supply, etc. For example, even though the rotation speed of the machine motor 20 has increased by 5% to 6BOrpm,
Assuming that the rotation speed of the feed roller 14 does not change, the weaving width is: L = VfX x X D / Vm = 5730X πX 6 /630 = 171.4c
The weft thread becomes a loop, and the thread becomes as short as 8.6 am, so a well-known weft detection device detects this abnormality and the machine stops.

Therefore, in the embodiment of the present invention, the rotation speed of the feed roller 14 is changed at a rate corresponding to the change in the rotation speed of the machine, ie, at a rate of 5% in the example assumed above. Therefore, the rotation detector 24 detects the actual rotation speed of the machine motor 20, and the detected rotation speed signal is ^
After being converted into a digital value by the /D converter 25, it is input to the control circuit 22, where it is compared with the initial setting value of the machine motor rotation speed 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 control circuit 22 calculates the rotation speed of the feed roller 14 which is the initial setting value + 5%, that is, Vf = 6017 rpa + Then, the variable speed motor 16 is instructed via the drive circuit 21 to drive the feed roller 14 at this speed. In this way, the feed roller 14 is driven at Vf = 6017 rpm in response to variations in the rotation speed of the machine motor 20, so the weaving width is L = T/fX yr X D / V + a = 601
7XπX 6 / 830 = 180cm, which is 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.

Next, with reference to Figure $1, Figures 2, and 3, operations upon stopping and starting the machine will be explained. When the machine stop signal is output at time t1, the machine motor 20 starts as shown in a) of FIG.
As shown in the figure, this stop signal causes the power supply to be turned off in the normal manner.
The machine is stopped at time t2.

On the other hand, this machine stop signal is also sent to the variable speed motor 16 for the feed roller 14, and the variable speed motor 16 is also
) is disconnected from the power supply as shown in (). As mentioned above, due to the difference in inertia, etc., the variable speed motor 16 operates relatively faster than the machine motor 20, as shown in FIG. 2C).
If the machine stops and restarts without leaving it, the disadvantageous result will be that the stored yarn length is insufficient as described above. Therefore, in the embodiment of the present invention, the variable speed motor 1
6 or the feed roller 14 is associated with a rotation detector 26, and the rotation detection signal of the feed roller shown in d) in FIG. 2 detected by the rotation detector 26 is converted into a digital value by a ^/D converter 27. In addition to being input to the control circuit 22, the rotation speed a of the feed roller corresponding to one start is also input to the control circuit 22 by the rotation speed setting device 28.

When the machine stop signal is input to the control circuit 22, the control circuit 22 starts the feed roller rotation detection signal Run F, and calculates the cumulative rotation time of the variable speed motor 16 and therefore the feed roller 14 until it actually stops. The rotation speed is stored, and the difference c=a−b between the rotation speed a and the rotation speed a for one start is calculated. Thereafter, the control circuit 22 calculates the time T required for the feed roller 14 to rotate by the rotational speed difference C from a stopped state when a predetermined voltage is applied. In addition, the control circuit 22 is given a delay of T1 time from the time Mtn when the machine start signal is sent to when the start command is actually issued to the feed roller motor 16 as an abnormality check time for each part of the machine 8! (T+≧0).

Therefore, according to the present invention, as shown in the control steps in FIG. 3, when a machine stop signal is generated at time t1, the machine machine motor 20 is stopped at time t2 as usual, and the feed roller speed change The motor 16 also stops at the opening time t as usual, but the control circuit 22 has a 1-vic rotation speed setting device 28.
is not connected, and the feed roller 1 is set by the setting device 28.
4 is set, and the rotation detector 26 of the feed roller 14 is connected to receive the rotation detection signal of the feed roller, so the control circuit 22
is feed roller motor 1 from the time the machine stop signal is generated.
Time until the stop of 6 13-1. feed roller 14
It is necessary to memorize the total number of revolutions actually rotated by the feed roller 1, and store the difference C1 between the set number of revolutions a for one pick, that is, the weft for one pick.
Calculate the remaining cumulative number of rotations c=a b) at which the feed roller motor 16 should be rotated (b) in Fig. 2.
Feed roller 1 when driven at the steady voltage shown in
c/v by calculating the number of revolutions per unit time or speed V from the time of startup of 4.

That is, the drive time T (≧0) of the feed roller 14 required for the remaining cumulative number of rotations C is determined.

Therefore, when the machine start signal is generated at time t4, the machine motor 20 is automatically started at time t, as usual.
The feed roller motor 16 is started to start after the above-mentioned time T, which is the abnormality check time for each part, has elapsed. That is, the control circuit 22 determines that the above-mentioned time T is Ta=
T+T, determine whether it is greater than or not. If YES, Ta is corrected to Tb (≧T); if NO, the feed roller motor is started after Ta (Tb) T=T+ (≧O). In this way, at time t6 when the time T has elapsed after startup, exactly one pick of weft yarns have been accumulated from time t1 when the machine stop signal was generated. This time point t6 coincides with α when forest entry is suitably started in synchronization with the machine.

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 various other weft length measuring devices, such as , 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. Length 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, one of which 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 guide 6 and is inserted into the weft guide path 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 the machine base motor 2.
0 and is driven and controlled according to the present invention in the manner described in the above embodiment. That is, the variable speed motor 3
7 is also provided, and in response to machine stop and start signals, the control circuit 22 controls the variable speed motor 16 via the drive circuit 21 and also controls the drive circuit. Controlling the variable speed motor 37 via 38,
Appropriate weft storage operations can always be performed in synchronization with the stopping and starting of the machine motor 20.

The variable speed motor may be a servo motor or one equipped with an electromagnetic brake, or the feed roller may be driven by using an inverter.

[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 stand motor, and the start of the variable speed motor by the machine stand start signal is as follows: Since the feed roller is controlled to reach the cumulative number of rotations for one pick at the start of weft insertion, there is no shortage of stored weft length when the next weft insertion starts after the machine stops, and there is no weft insertion error. Weaving can be realized. However, changing the weave width becomes extremely easy.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an example of a device implementing the control method of the present invention, FIG. 2 a) to d) are diagrams showing the time relationships of various signals in the embodiment of FIG. 1, and FIG. 4 is a block diagram showing the control steps of the control method according to the present invention, FIG. 4 is an overall configuration diagram showing an example of another weft length measuring device implementing the present invention, and FIG. vJ5 is a perspective view showing a conventional weft length measuring device. It is. Y...Weft 14...Feed roller 1
6... Variable speed motor 20... Machine base motor 21.
... Drive circuit 22 ... Control circuit 24 ... Rotation detector 26 ... Rotation detector 23 ... Initial rotation speed setting device Fig. 1

Claims (1)

[Claims] Initial rotation speed and 1-vic rotation speed (a) are instructed to a variable speed motor that is separate from the machine motor, and the variable speed motor, which is operated under the specified rotation speed conditions, feeds the weft yarn to the weft length measuring device. Driving the roller, stopping the machine motor and variable speed motor in response to a machine stop signal, and measuring the actual number of revolutions (b) rotated from when the machine stop signal was received until the variable speed motor stopped. In a shuttleless loom, the rotation start time of the variable speed motor is controlled so that the variable speed motor rotates by the rotation speed difference (a) - (b) before the start of weft insertion when the next machine is started. A method of controlling a weft length measuring device.