JPH0680226B2 - Weft density monitoring device for loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weft density monitoring device for a loom, which is applied to a loom provided with a winding mechanism independent of a main motor, a so-called single winding motor.

Conventional technology The conventional loom has main movements such as opening and picking,
With the winding operation of the woven fabric, both were driven by the main motor in conjunction with each other, but it is difficult to set the free weft density with this, so a single motor for the winding operation is It is becoming more common to install it separately.

In a loom equipped with such a single winding motor, it is necessary to realize a predetermined weft density on the woven cloth by operating the winding motor at a predetermined speed depending on the weaving speed of the woven cloth. For this reason, various control methods have been proposed (for example, Japanese Patent Application No. 60-168042 (Japanese Unexamined Patent Publication No.
2-28447), Japanese Patent Application No. 60-199539 (JP-A-62-62959)
issue)).

Then, when the control device of the winding motor becomes out of order for some reason and its operating speed deviates from the predetermined speed, the weft density on the woven fabric to be woven is disturbed, which is a fatal fabric defect. Although it is clear that, in view of such a point, a device capable of continuously monitoring the weft density on the woven fabric while the loom is operating has not been devised. This is thought to be due to the fact that it has a short history since the use of the single winding motor, but if the loom is operated for a long time with the weft density deviating from the predetermined value, a large amount of In addition to the result of producing defective woven fabric, it is impossible to judge the suitability of the weft density of the woven fabric only by visually monitoring the running loom. , Is extremely effective.

OBJECTS OF THE INVENTION Accordingly, in view of the circumstances of the prior art, an object of the present invention is to focus on that the woven cloth density is determined by the number of pick operations of the loom during operation and the winding cloth length of the woven cloth. ,
A weft yarn of a new loom, which can continuously monitor the weft yarn density by calculating the weft yarn density by using a pick signal for detecting a pick operation and a cloth length signal for detecting a winding cloth length as information sources. It is to provide a density monitoring device.

Configuration of the Invention According to the configuration of the present invention for achieving the above object, a pick detecting means and a cloth length detecting means are provided, and a pick signal and a cloth length signal obtained from these means are input to calculate the weft density. By providing a calculating means and comparing this output weft density signal between the maximum and minimum allowable weft density setting values, it is monitored whether the current weft density is within the allowable range. However, when it deviates from the allowable range,
By outputting an alarm signal, the information sources for calculating the weft density are all obtained at all times during the operation of the loom. The main point is that weft density can be continuously monitored freely.

Example Hereinafter, an example will be described with reference to the drawings.

The weft density monitoring device of the loom includes a pick detection means 10, a cloth length detection means 20, a calculation means 30, and a weft density signal DW calculated by the calculation means 30 as a maximum allowable set value DM and a minimum allowable set value. First comparison means to compare with DL respectively
It comprises 40 and a second comparing means 50 (FIG. 1).

The pick detecting means 10 outputs, for example, one pulse signal per one rotation of a main shaft of a loom (not shown) as a pick signal PN, and the cloth length detecting means 20, for example,
The rotation of a take-up roller (not shown), which is driven by a winding motor other than the main motor, is detected, and a cloth length signal is output as a pulse train signal corresponding to the cloth length of the woven cloth wound by the take-up roller. It outputs PW.

The calculation means 30 uses the pick signal PN from the pick detection means 10.
And the cloth length signal PW from the cloth length detecting means 20 are inputted,
A weft density signal DW is output by using both the signals PN and PW as information sources. However, the weft density signal DW represents the weft density of the woven fabric being woven by the loom, and its unit can be either the number of picks per unit cloth length or the cloth length per pick. Therefore, depending on the unit of weft density used, the maximum allowable set value input to the subsequent comparison means 40, 50.
The unit of DM and the minimum allowable set value DL is selected and the unit of each signal is unified.

The weft density signal DW is the first comparison means 40 and the second comparison means.
It is branched to 50, and the maximum and minimum allowable set values DM and DL from the maximum and minimum allowable value setting means 45 and 55 are input to both comparing means 40 and 50, respectively. Therefore, an excessive signal that is the output of both comparison means 40 and 50
Da, under-signal Db, weft density is the maximum and minimum allowable set value
It indicates deviation from the allowable range defined by DM and DL, and AND gate with input of excessive signal Da and under signal Db
As an output of 60, an alarm signal SA is obtained.

A specific example of the weft density monitoring device having such a configuration is shown in FIG.

Here, the calculation means 30 is configured to include a counter 31, a latch 32, and a number generator 33. That is, the cloth length signal PW from the cloth length detection means 20 is input to the counter 31 in the form of a pulse train signal for detecting the cloth length with a sufficiently small resolution, and the output thereof is passed through the latch 32 to the number of bits. While being connected to the generator 33, the pick signal PN obtained from the pick detecting means 10 is supplied to the load terminal of the latch 32 via the one-shot multivibrator 34, and the output of the one-shot multivibrator 34 is supplied to another one. It is input to the clear terminal of the counter 31 via the shot multivibrator 35.

The output of the number generator 33 is used as a weft density signal DW to form each of the comparators 4 forming the first comparing means 40 and the second comparing means 50.
It is branched to 1 and 51, and the output is
The signal is input to the OR gate 60 as the excessive signal Da and the excessive signal Db, and is output to the outside as the alarm signal SA.

The maximum allowable setting value DM and the minimum allowable setting value DL are input to the comparators 41 and 51, respectively. Here, the adder 46 and the subtractor 56, which are the sources of these two signals, respectively form the maximum allowable value setting means 45 and the minimum allowable value setting means 55, and the adder 46 and the subtractor 56 are connected to each other. The respective outputs of the weft density setting device 61 and the weft density allowable width setting device 62 are input.

Now, when the pick signal PN from the pick detecting means 10 is generated, this is generated by the two-stage one-shot multivibrator 3
Since it is transmitted to the clear terminal of the counter 31 via 4, 35, the counter 31 is cleared. Therefore, the number of pulses of the subsequent cloth length signal PW is accumulated in the counter 31 and calculated.

Following the previous pick signal PN, the subsequent pick signal PN
When occurs, a pulse is applied to the load terminal of the latch 32 via the one-shot multivibrator 34,
The current contents of the counter 31 are transferred to the latch 32 as they are, and the latch 32 holds the data. At the same time, the counter 31 is cleared by the pulse from the other one-shot multivibrator 35 and restarts the counting operation of the cloth length signal PW until the next pick signal PN is issued.

The data transferred to and retained in the latch 32 is the cloth length signal PW between the two subsequent pick signals PN.
Finally, it is the weft density of the woven fabric during weaving, expressed in cloth length per pick. Therefore, the resolution of the cloth length signal PW is set to a (mm / pulse) and the latch 32
If the data of Pm (pulse) is used, the actual weft density is
aPm (mm / pick) and therefore
The characteristic of the number generator 33 is that the output with respect to its input Pm is
If we set DW = a · Pm, weft density signal obtained
The unit of DW is the cloth length per pick as it is. On the contrary, if DW = 1 / (a · Pm) is set, the weft density signal DW in which the number of picks per unit cloth length is used as a unit can be obtained.

Further, the woven fabric is wound up by a take-up roller (not shown) having a diameter D (mm), and a resolution M provided at the shaft end thereof.
(Pulse / rotation) rotary encoder to cloth length signal PW
, The resolution of the cloth length signal PW is πD / (2
5.4M) (inch / pulse), the characteristic of the frequency generator 33 is defined as DW = 25.4M (πDPm), and the unit of the weft density signal DW is set to the conventional (pick / inch). be able to.

On the other hand, the maximum allowable set value DM output from the adder 46 is the sum of the set value D of the weft density setting device 61 and the set value Δd of the weft density allowable width setting device 62, and DM = D + Δd, Since the minimum allowable set value DL that is the output of the subtractor 56 is DL = D−Δd, the comparator 41 outputs an excessive signal when DW> DM.
If both comparators 41 and 51 are set such that Da is output and the comparator 51 outputs the under-signal Db when DW <DL, the alarm signal SA output from the OR gate 60 is the weft density. The signal DW is output when it deviates from the allowable range (D ± Δd) determined by the maximum allowable setting value DM and the minimum allowable setting value DL.

The alarm signal SA is led to a control circuit (not shown) and can be used as a command signal for an automatic stopping operation of the loom, an alarm operation, and the like.

In the above description, the weft density allowable width setting device 62 determines the width of the allowable range (D ± Δd) according to the set value Δd, so in practice, the fixed constant generator 62a.
Is sufficient (Fig. 3). Further, the maximum allowable value setting means 45 and the minimum allowable value setting means 55 are respectively set to 1
Needless to say, the maximum allowable set value DM and the minimum allowable set value DL may be directly set by each setter. Further, the allowable range may be determined by setting the allowable ratio by the weft density allowable width setting device 62 and by setting the setting value and the setting value D.

Further, the weft density setting device 61 is used as a target value setting device for the speed control device 70 of the winding motor 75 that drives the take-up roller, and the cloth length signal PW is used as the speed control device.
As a signal source for calculating the control amount in 70, each can be shared with the weft density monitoring device (fourth
Figure). In particular, when the weft density of the woven fabric during weaving is appropriately changed and controlled by the patterning control device 77 to change the weft density, so-called alternate weaving is performed, and the patterning control device 77 is operated. Since the target is unified,
It can contribute to the simplification of the circuit. However, in FIG. 4, the speed control device 70 shows an example,
The pulse signal from the rotary encoder 76 attached to the main shaft 11 of the loom and the cloth length signal PW from the rotary encoder (not shown) attached to the take-up roller are respectively deviated via the frequency dividers 71 and 72. Based on the output signal of the deviation counter 73, input to the up input terminal U and the down input terminal D of the counter 73 so that the rotation amount of the take-up roller follows the rotation amount of the main shaft 11 of the loom.
The winding motor 75 is driven via the control amplifier 74. Here, by setting the frequency division ratio of each of the frequency dividers 71 and 72 to a predetermined value, the winding operation of the woven fabric can be performed with a desired weft density, so the patterning control device
The setting value D of the weft density setting device 61 is variably controlled by the 77 to change the frequency division ratio of the frequency divider 71 so that the change weaving is performed.

In this embodiment, the pick signal PN from the pick detecting means 10 is appropriately input to the calculating means 30 via a counter or the like so that the weft density is monitored in units of cloth length per plural picks. You can also do it.

Other Embodiments The calculating means 30 can be formed only by the AND gate 36 by devising the pulse width of the cloth length signal PW so as to indicate the winding time of a unit cloth length, for example, 1 inch of cloth length. Yes (Fig. 5).

Here, the cloth length detecting means 20 is constituted by cam plates 21a and 21a fixed to a shaft 21 that interlocks with a take-up roller, and a proximity switch 22 facing the cam plates 21a and 21a to adjust the tooth width of the cam plates 21a and 21a. As described above, the pulse width of the cloth length signal PW obtained as the output of the proximity switch 22 is a pulse train signal equal to the winding time of the unit cloth length of the woven cloth to be woven.

The pick signal PN, which is the output of the pick detecting means 10 constituted by the protrusion 11a provided on the main shaft 11 of the loom and the proximity switch 12 facing it, is input to the AND gate 36 together with the cloth length signal PW. , The count content of the counter 52 connected to the output of the AND gate 36 indicates the time when the AND gate 36 is open, that is, the number of picks in the winding time of the unit cloth length, which is the unit as it is. It is the weft density of the woven cloth expressed by the number of picks per cloth length. Therefore, the output of the AND gate 36 is set as the weft density signal DW,
Branch to another counter 42 as well as both counters.
By comparing the contents of 42 and 52 with the set values DM and DL of the maximum allowable value setting means 45 and the minimum allowable value setting means 55, respectively, the weft density can be monitored in the same manner as in the previous embodiment.

Now, suppose that the cloth length signal PW falls from the H level to the L level, and the count contents of both counters 42 and 52 at that time are set to D (where D <DL <DM). Both counters 42, 52
Since the outputs of the above both hold the L level, the output of the inverter 53 on the output side of the counter 52 becomes the H level and the AND gate 54 is opened. On the other hand, the proximity switch 22
The output of the inverter 62 connected to is at H level as the cloth length signal PW changes, so that the one-shot multivibrator 63 is driven and its output pulse changes to
It is output as an alarm signal SA through the opened AND gate 54 and the OR gate 60. If DL ≦ D ≦ DM, the output of the counter 52 becomes H level, but since the AND gate 54 is closed by the inverter 53, the alarm signal SA is not output.

If D> DM when the cloth length signal PW is at H level,
At that point, the output of the counter 42 immediately changes to the H level, and the alarm signal SA is output via the OR gate 60.

The delay circuit 64 and the one-shot multivibrator 65, which are branched and connected to the output of the inverter 62, form a clear circuit for the counters 42 and 52, and slightly after the cloth length signal PW returns from the H level to the L level. At a delayed timing,
Send a clear pulse to the clear terminals of both counters 42 and 52,
Both counters 42 and 52 are cleared.

Therefore, here, the counter 42 has the first comparing means 40.
In addition, a circuit composed of a counter 52, an inverter 53, and an AND gate 54 has a second comparing means 50, respectively.
Are formed, and their respective outputs are over-signal Da and under-signal Db.
It has become.

In this embodiment as well, it goes without saying that the various modifications described in the previous embodiment are possible, and further, the pick signal PN is not limited to the one that detects the rotation of the main shaft 11 of the loom, for example, Alternatively, a signal of a weft feeler provided to monitor whether weft insertion is normally performed may be used.

Also, in any of the embodiments, the same function can be easily realized by software in the microcomputer.

EFFECTS OF THE INVENTION As described above, according to the present invention, the calculating means for inputting the pick signal and the cloth length signal and outputting the weft density signal, and the weft density signal for the maximum allowable set value of the weft density,
Further, by providing a first comparing means and a second comparing means for comparing with the minimum allowable set value, and outputting an alarm signal when the weft density signal deviates from the permissible range, the weft density Since the signal indicates the current value of the weft density of the woven fabric during weaving, there is a novel and excellent effect that the weft density can be continuously monitored during the operation of the loom.

In addition, since the maximum and minimum allowable set values can be variably controlled in conjunction with the target value for the speed control device that controls the winding motor, they are effectively applied even when so-called weaving is realized. There is also an effect that you can.

[Brief description of drawings]

1 to 4 show an embodiment, FIG. 1 is a whole system diagram, FIG. 2 is a whole detailed system diagram, FIG. 3 is a main part system diagram showing a modified example, and FIG. 4 is another modified example. It is a principal part systematic diagram which shows an example. FIG. 5 is a view corresponding to FIG. 2 showing another embodiment. PN …… Pick signal PW …… Cloth length signal DW …… Weft density signal DM …… Maximum allowable setting value DL …… Minimum allowable setting value SA …… Alarm signal 10 …… Pick detecting means 20 …… Cloth length detecting means 30 …… Computing means 31 …… Counter 32 …… Latch 33 …… Rule generator 36 …… And gate 40 …… First comparing means 50 …… Second comparing means 75 …… Winding motor 77 …… Handle Output control device

Claims (6)

[Claims] 1. A loom equipped with a winding motor independent of a main motor, pick detecting means for detecting a pick operation and outputting a pick signal, and a cloth length signal for detecting a cloth length of a woven cloth to be woven. A weft density detecting means for outputting the weft density signal and a weft density signal for calculating the weft density by inputting the pick signal and the cloth length signal, and a maximum allowable set value of the weft density and the weft density signal. And a second comparing means for comparing the weft density signal with the minimum permissible set value of the weft density, and the weft density signal with the maximum permissible set value and the minimum permissible value. A weft density monitoring device for a loom, which outputs an alarm signal when it deviates from an allowable range defined by a set value. 2. The weft yarn density monitoring device for a loom according to claim 1, wherein the weft yarn density is represented by the number of picks per unit cloth length. 3. The weft density monitoring device for a loom according to claim 1, wherein the weft density is represented by a cloth length per pick. 4. The calculating means includes a counter for inputting and counting the cloth length signal, a latch for temporarily holding the contents of the counter in response to the pick signal, and a number for converting the output of the latch. 3. A generator, wherein the counter is cleared with the holding operation of the latch, while the output of the number generator is output as the weft density signal. Alternatively, the weft density monitoring device of the loom according to the third aspect. 5. The cloth length signal is a pulse signal having a pulse width equal to a winding time length of a unit cloth length, while the calculating means receives the cloth length signal and the pick signal as an AND gate. The weft density monitoring device for a loom according to claim 2, characterized in that 6. The maximum permissible set value and the minimum permissible set value of the weft density can be variably set according to a command signal from a patterning control device.
Item 5. A weft density monitoring device for a loom according to any one of items 5 to 5.