JPH01229848A - Operation speed control for loom and unit therefor - Google Patents

Abstract

PURPOSE:To provide the title control method and unit therefor so designed that the type of present opening pattern in plural frame to make warp opening is assessed to select and determine the speed command value for a driving motor, thereby operating the driving motor at the permissible maximum level corresponding to the type of opening pattern. CONSTITUTION:A pattern read control section 32 reads an opening pattern corresponding to a pick number in the contents of a counter 31 from a pattern storage 34 along with reading the type of present opening pattern, and outputs a pattern signal Spt to the pattern assessment section 11 in a controller 10. The assessment section 11 then outputs to a selection section 12 a selection command signal Ss so that one of speed command values prepared in the selection section 12 be selected corresponding to patterns P1, P2.... A speed command value signal Sm is outputted to an inverter INV, thus a driving motor M is operated at the corresponding speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a loom that uses a plurality of heddle frames to shed warp threads, and the operating speed of the loom is selected to be the maximum allowable speed according to the current shedding pattern. The present invention relates to a method and device for controlling the operating speed of a loom to further improve productivity.

The maximum permissible operating speed of conventional looms is limited by various factors, but in particular, when controlling the shedding of a large number of heald frames using dobbies, the vibration of the frame when shedding the heald frames is However, it is rarely a decisive factor (
do not have.

Thus, the vibration of the frame is largely influenced by the aperture pattern specified by the dobby. In other words, in a shedding pattern where the number of ascending heald frames and the number of descending heald frames are selected to be approximately the same for each pick, vibration can be suppressed to a relatively small level, but there may be an extreme imbalance between the number of ascending heald frames and the number of descending heald frames. In such an aperture pattern, frame vibration tends to be large. However, here, the number of ascending sheets refers to the number of heald frames driven upward during warp shedding, and the descending number refers to the number of heald frames driven downward,
A warp opening is formed between the warp threads separated vertically by each heald frame.

On the other hand, the operating speed of conventional looms is generally set at the maximum allowable value for the shedding pattern that is most likely to generate vibrations, and there are no operating methods that actively select and change the operating speed depending on the shedding pattern. , all (unknown.

The problem to be solved by the present invention is that, when using such prior art, although weaving is performed using a shedding pattern that is most likely to generate vibration, it is possible to weave, but weaving is performed using a shedding pattern that is not likely to cause vibration. In some cases, there was still some leeway in operating speed and there was room for improvement in productivity, which was unreasonable. In other words, the shedding pattern of the loom is changed as the weaving progresses to form a predetermined weaving pattern, so if the operating speed of the loom is kept constant throughout the weaving process, This is because when weaving is performed using a shedding pattern that does not easily generate vibrations, the weaving operation will be performed with an excessive margin.

Therefore, in view of the actual state of the prior art, it is an object of the present invention to determine the type of the current aperture pattern as to whether it is a pattern that is likely to generate vibrations or a pattern that is difficult to generate vibrations, and An object of the present invention is to provide a method and apparatus for controlling the operating speed of a loom, which can further improve productivity by switching and selecting the most appropriate operating speed based on the above.

Another object of the present invention is to focus on the fact that the aperture pattern can be determined more accurately by detecting the peak power consumption of the drive motor or the vibration of the frame. , using those data,
An object of the present invention is to provide an operating speed control device for a loom, which determines the type of shedding pattern.

Means for Solving the Problems The first invention according to this application to achieve the above object determines the type of the current shedding pattern of a plurality of heald frames for warp shedding, and issues a speed command to the drive motor. Its gist is to select and determine values.

Further, the configuration of the second invention includes a pattern determining section that determines the type of shedding pattern specified by the dobby for each pick, and a speed command of the drive motor in response to the type of shedding pattern determined by the pattern determining section. The gist is that the speed command value selection section is provided with a speed command value selection section for selecting a value, and the speed of the drive motor is determined by the output of the speed command value selection section.

Note that the pattern determination unit may determine the type of shedding pattern based on the peak value of power consumption of the drive motor at each shedding timing, or based on the vibration of the frame at the top dead center or bottom dead center of the heald frame. Make it good.

Therefore, according to the configuration of the first invention, the type of the current aperture pattern is determined as to whether it is likely to generate vibration or is not likely to generate vibration, and then the tolerance corresponding to the determination result is determined. Since the operating speed command value corresponding to the maximum value can be selected and given to the drive motor, the loom always operates at the maximum allowable operating speed corresponding to the current shedding pattern as weaving progresses. This makes it possible.

Further, when according to the configuration of the second invention, the pattern discrimination section discriminates the type of the opening pattern specified by the dobby, and outputs the discrimination result to the speed command value selection section,
Since the speed command value selection unit can determine the operating speed of the drive motor in accordance with the type of opening pattern, by making the determination content of the pattern determination unit similar to that in the first invention, , the drive motor is similarly
During the entire weaving process, it can be operated at its maximum permissible operating speed.

Furthermore, the peak value of power consumption of the drive motor at each shedding timing is an index indicating the amount of imbalance between the number of ascending heald frames and the number of descending heald frames during shedding, that is, a factor that limits the maximum allowable operating speed of the loom. Therefore, the pattern discrimination unit can use this to discriminate the type of shedding pattern, and furthermore, the vibration of the frame at the top dead center or bottom dead center of the heald frame can be similarly determined. It can be used as data for

It works as described above.

Example Examples will be described below with reference to the drawings.

A loom operating speed control device (hereinafter simply referred to as a control device) 10 includes a pattern discrimination section 11 and a speed command value selection section 12.
It consists of an electronic dobby 30 and an inverter INV for variable speed driving the drive motor M of the loom (Fig. 1).
It is interposed between.

The drive motor M is a driving motor for a loom (not shown), and is connected to an electric power source AC via an inverter INV.
It is assumed that variable speed operation is performed by the inverter INV.

The dobby 30 inputs the forward rotation pulse signal Spl and the reverse rotation pulse signal Sp2 from the step signal generation means 20, and outputs a drive signal Sd for the heald frame HF, while informing the control device 10 of the current opening pulse signal Sp2. It outputs a pattern signal Spt indicating the contents of the pattern.

The step signal generating means 20 includes two proximity switches 21a,
21b is disposed near the main shaft MS of the loom,
It includes a step signal generation section 22.

That is, the proximity switches 21a and 21b are arranged so as to face the operating piece MSI protruding from the main shaft MS,
By manually inputting the output signal to the step signal generation section 22, the step signal generation section 22 generates the normal rotation pulse signal Spl.
and a reverse pulse signal Sp2. However, here, it is assumed that the forward rotation pulse signal Spl and the reverse rotation pulse signal Sp2 indicate the pick timing when the loom is rotating in the forward rotation direction and the reverse rotation direction, respectively.

The electronic dobby 30 includes a counter 31 that inputs the forward rotation pulse signal Spl and the reverse rotation pulse signal Sp2, as well as a pattern readout control section 32, a drive section 33, and a pattern storage section 34. That is, the output of the counter 31 is connected to the drive section 33 via the pattern readout control section 32, and the output is inputted to the heald frame HF as the drive signal Sd.

On the other hand, the output of the pattern storage section 34 is input to the pattern readout control section 32.
The output is input to the control device 10 as a pattern signal Spt.

The control device 10 includes a pattern discrimination section 11 that inputs a pattern signal Spt, and a speed command value selection section 12, and the output of the latter is sent to the inverter I as a speed command value signal Sm.
It is input to NV.

The operation of the control device 10 having such a configuration is as follows.

First, in the electronic dobby 30, the counter 31 forms a reversible counter into which a forward rotation pulse signal Spl and a reverse rotation pulse signal Sp2 are input, and its contents indicate the current pick number.

On the other hand, the pattern storage unit 34 stores the opening pattern of the heald frame HF for each pick.

Here, the shedding pattern indicates, for each pick number, position command information indicating whether each one of the plurality of heald frames HF corresponding to the warp number should take the upward position or the downward position. For example, in the shedding pattern shown in FIG. 2, in the first pick, there are 17 heald frames H
Of F, No. 1.4.7.9.10 specified with diagonal lines,
It shows that the nine pieces corresponding to the 11th, 13th, 15th, and 17th positions are rising, and the other 8 pieces are falling.

In this example, the first pick to the 42nd pick represent one round (repeat) unit of the shedding pattern, and this shedding pattern is repeated thereafter to advance the weaving. In addition to this aperture pattern, the pattern storage section 34 also stores patterns such as a first pattern P1 for the first to 24th picks, a second pattern P2 for the 25th to 36th picks, and a second pattern P2 for the 37th to 42nd picks. pick the third
It is assumed that the type of aperture pattern designated as pattern P3 is also stored.

The pattern reading control section 32 reads the opening pattern corresponding to the pick number of the contents of the counter 31 into the pattern storage section 3.
Read from 4. That is, when the content of the counter 31 is the number M, M-n Mo + a (where n
is an integer, Mo=42 is the number of picks per round of the shedding pattern, and a is the remainder).The position command information for each heald frame HF corresponding to a is read from the pattern storage section 34 and is given to the drive section 33. , the drive unit 33 is capable of raising a designated heald frame HF and lowering the other heddle frames HF to create a predetermined warp shedding.

On the other hand, the pattern readout control unit 32 determines that the current aperture pattern is the first pattern P1, the second pattern P2, and the third pattern P1.
The type of the aperture pattern corresponding to the pattern P3 is also read out, and this is used as the pattern signal Spt to be sent to the pattern discrimination unit 1 of the control device 10.
Output to 1.

The pattern discrimination unit 11 selects the first to third patterns P1.
, P2, . 1
2, the speed command value selection unit 12 outputs the selected speed command value N1 (i=1
．． 2.3) can be output as the speed command value signal S+n.

Therefore, the drive motor M has a speed N1 (i=1.2.3)
It is something that can be driven.

Now, considering the opening pattern in FIG. 2, the speed command value Nf is determined by the first to third patterns P1, P2,...
・It is preferable to set N3 > NI N2. That is, in the first pattern P1,
Of the 17 heald frames HF, the rising pattern of 9 pieces is repeated, whereas in the second pattern P2, after 3 pieces are lifted over 2 picks, the 8 pieces are lifted. The material is lifted one pick at a time, and weaving is carried out in units of one pick. Therefore, the amount of imbalance between the number of ascending heald frames HF and the descending number of heald frames HF in the second pattern P2 is more remarkable than that in the first pattern P1. Frame vibration is likely to occur. therefore,
The operating speed N2 in the second pattern P2 must be kept considerably lower than the operating speed N1 in the first pattern P1.

On the other hand, in the third pattern P3, the number of sheets in the ascending row is eight, which is one less than in the first pattern P1, but the amount of imbalance between the number of sheets in the ascending row and the number of sheets in the descending row is as follows.
There is not much difference. In general, somewhat greater power is required to raise the heald frame than to lower it, so the operating speed N3 in the third pattern P3 is set to be somewhat larger than the operating speed N1 in the first pattern P1. Is possible.

Other embodiments of the control device 10 can also be formed in combination with a mechanical dobby 40 (FIG. 3).

The mechanical dobby 40 connects a large number of patterned papers 41, 41... and mechanically reads the positions of perforations made therein using pins (not shown), thereby raising and lowering the heald frame for each pick. Since each piece of patterned paper 41, 41... corresponds to one pick, patterned paper 41, 41... can be controlled for each round of a predetermined opening pattern. A number of pieces corresponding to the number of picks are connected in a ring and used.

The patterns 41, 41, . . . are provided with a mark 41a indicating the first pick for the one corresponding to the first pick, and a sensor 42 is provided to detect this mark 41a. However, the sign 41a and the sensor 42 are, for example,
Any combination of magnet pieces and proximity sensors, perforations and photoelectric sensors, etc. can be used.

In addition to the pattern discrimination section 11 and speed command value selection section 12 similar to those in the previous embodiment, the control device 10 receives the forward rotation pulse signal spl and the reverse rotation pulse signal Sp2 from the sidewalk signal generation means 20, respectively. A counter 13 that calculates the current pick number by inputting it to the amplifier terminal U and the down terminal R, and outputs it to the pattern discrimination section 11;
A pattern for providing the type of aperture pattern indicated by the pattern paper 41, 41, etc. to the preset control circuit 14 for regulating the contents of the pattern, the maximum step number setting device 15, and the pattern discriminator 11. It includes a type setting device 16 and a pattern type storage section 17.

That is, the outputs of the sensor 42, counter 13, and maximum step number setter 15 are input to the preset control circuit 14, and the output is connected to the reset terminal R of the counter 13.
(In addition, the output of the pattern type setting device 16 is connected to the pattern discrimination unit 1 via the pattern type storage unit 17).

The maximum step number setting device 15 has a number of picks MO1 forming one round unit of the aperture pattern, that is, 41.41
Set the number of... On the other hand, if the preset control circuit 14 forcibly initializes the contents of the counter 13 to 1 when there is an output from the sensor 42 or when the contents of the counter 13 exceed the number of picks Mo, then The contents of the counter 13 are the normal rotation pulse signal S
With p1, the current pick number forming one round unit of the aperture pattern can be counted and displayed. However, when the contents of the counter 13 become zero due to the reverse pulse signal Sp2, the preset control circuit 14 forcibly makes the contents of the counter 13 match the pick number MO.

The pattern type storage unit 17 stores the type of opening pattern corresponding to the pick number. That is, the aperture pattern at the current pick number is, for example, the first to third patterns P1, P2, . . . in the previous embodiment.
It is assumed that information on which pick number corresponds to is stored for each pick number, and that data is 41, 41,...
・Corresponding to the aperture pattern expressed in
It is assumed that data is set via the pattern type setting device 16.

After reading the contents of the counter 13 and recognizing the current pick number, the pattern discrimination unit 11 compares it with the data in the pattern type storage unit 7 to identify the type of opening pattern corresponding to the current pick number. Therefore, the speed command value selection signal Ss can be outputted to the speed command value selection section 12 to select and set the operating speed of the drive motor M in the same manner as in the previous embodiment.

The control device 10 further controls the power consumption Wm of the drive motor M.
can also be formed as an input (Fig. 4). That is, between the inverter INV and the drive motor M,
By detecting the voltage V and current (2) input to the drive motor M and inputting them to the electric current transducer W, the power consumption Wm of the drive motor M can be obtained as the output. However, here, it is assumed that the current 1 is measured via the current transformer CT, and furthermore, the current 1 is measured via the current transformer CT, and furthermore, the current 1 is measured via the current transformer CT.
A mechanical angle signal S of the loom is connected between the
A peak hold circuit 18 which receives A as an input is shown interposed therein.

The power consumption Wm obtained in this way generally has sharp peak values ΔL1, ΔL2 at the shedding timing of the loom.
. . ), and its size differs depending on the type of aperture pattern PI, P2, . . . . Therefore, in the pattern discriminator 11, the peak value ΔL1 detected via the peak hold circuit 18 is
, ΔL2... can specify the current aperture pattern type P1, P2...
Based on the result, if the speed command value selection signal Ss is output to the speed command value selection section 12, it is possible to perform the same control as in the previous embodiment. Here, it is assumed that the mechanical angle signal SA input to the peak hold circuit 18 is, for example, a timing pulse signal corresponding to the mechanical angle at the beginning of the opening timing, and the peak hold circuit 18 is inputted to the generation timing of the mechanical angle signal SA. Power consumption W at
By sampling and holding the peak values △L1, △L2... of m, power consumption W due to other causes such as beating of the reed can be reduced.
This helps eliminate the effects of variations in m.

In addition, when specifying the types of aperture patterns Pi, P2, etc., simply use the peak values △L1, △L of the power consumption Wm.
2.In addition to focusing on..., the average power L at that time
You may also pay attention to al, La2, and so on. Furthermore, by inserting an appropriate averaging circuit between the peak hold circuit 18 and the pattern discriminator 11 in FIG. The pattern discriminator 11 may be operated in accordance with the average value of .

In order to specify the type of shedding pattern Pi, P2, etc., in addition to focusing on the power consumption Wm of the drive motor M, it is also possible to focus on the amount of vibration of the frame at the top dead center or bottom dead center of the heald frame HF. good. In other words, by attaching a vibration sensor known as an acceleration sensor to an appropriate location on the loom frame or the dobby frame housing the dobby drive mechanism, the vibration of the frame can be obtained as the output signal of this vibration sensor. Therefore, if this signal is input to the control device 10 instead of the power consumption Wm from the electric power transducer W in FIG. 4, the same control as in the previous embodiment can be realized. Vibration sensors that can be used for this purpose include a piezoelectric type that uses a piezoelectric element, an electrodynamic type that detects electromotive force due to the movement of a pickup coil in a static magnetic field, and a vibration sensor that detects the movement of a pendulum as a change in capacitance. A servo type that is combined with a servo amplifier for torque balance, a strain gauge type that uses a strain gauge, etc. are commercially available.

As described in detail, according to the first invention of this application,
By determining the types of shedding patterns of a plurality of heald frames and selecting and determining the speed command value for the drive motor, it is possible to cope with the difficulty in generating vibrations depending on the type of shedding patterns.
Since it is possible to operate the drive motor at the maximum allowable value, productivity is significantly higher than when weaving at a constant speed according to the shedding pattern that is most likely to cause vibration. This has an excellent effect in that it is possible to improve the

Further, according to the second invention, the pattern determination unit determines the type of the opening pattern specified by the dobby, and the speed command value selection unit selects the speed command value of the drive motor in accordance with the determination result. By determining the speed of the drive motor based on the output of the speed command value selection section, the pattern determination section can determine the type of the current opening pattern, regardless of whether the dobby is electronic or mechanical. Since the determination can be made, it is possible to effectively implement the eleventh invention. Furthermore, depending on the peak power consumption of the drive motor at each shedding timing, or the vibration of the frame at the top dead center or bottom dead center of the heald frame,
Automatic discrimination of the type of aperture pattern has the remarkable effect of realizing more accurate operating speed control.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show an embodiment, with FIG. 1 being a system diagram of the overall configuration, and FIG. 2 being an explanatory diagram of an aperture pattern. FIG. 3 is a diagram corresponding to FIG. 1 showing another embodiment. 4 and 5 show another embodiment, FIG. 4 is a diagram corresponding to FIG. 1, and FIG. 5 is a diagram showing an example of changes in power consumption. HF... Heald frame PI, P2, P3... Type of opening pattern M...
・Drive motor Wm...Power consumption △Ll, △L2,
ΔL3...Peak value 10...Loom operating speed control device 11...Pattern discrimination section 12...Speed command value selection section 30.40...Dobby

Claims (1)

[Scope of Claims] 1) When operating a loom that performs warp shedding using a plurality of heald frames, the present invention includes determining the type of the current shedding pattern of the heald frames and selecting and determining a speed command value for the drive motor. Features: A method for controlling the operating speed of a loom. 2) A pattern discrimination unit that discriminates the type of aperture pattern specified by the dobby for each pick, and corresponding to the type of aperture pattern discriminated by the pattern discrimination unit,
1. An operating speed control device for a loom, comprising a speed command value selection section for selecting a speed command value of a drive motor, and the speed of the drive motor is determined by the output of the speed command value selection section. 3) A pattern discrimination section that discriminates the type of the current shedding pattern based on the peak value of power consumption of the drive motor at each opening timing, and a speed of the drive motor corresponding to the type of shedding pattern discriminated by the pattern discrimination section. 1. An operating speed control device for a loom, comprising a speed command value selection section for selecting a command value, and determining the speed of a drive motor based on the output of the speed command value selection section. 4) A pattern determining section that determines the type of the current shedding pattern based on vibration of the frame at the top dead center or bottom dead center of the heald frame, and a drive motor that determines the type of shedding pattern determined by the pattern determining section. 1. A speed command value selection section for selecting a speed command value, the speed of a drive motor being determined by the output of the speed command value selection section.