JPS6011145B2 - Method and device for detecting weft insertion errors in looms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for detecting a total thread insertion error in a loom.

Typically, a loom includes a yarn beam that sends out warp threads, a mechanism that inserts weft threads into the warp threads, and a winding roller that winds up the woven fabric.

In this case, it goes without saying that both the warp and weft are essential for forming the cloth. For this reason, warp yarn abnormalities and twill thread insertion errors are constantly detected. The present invention particularly refers to the latter stripe thread insertion error detection. Generally, striped yarns are subject to specific management.

In other words, a slight reeling error is allowed for the striped yarn. This depends on the quality grade required for the fabric, but for example, where 100 twill threads are to be inserted, only 2
Even if three of them are not inserted due to some kind of failure, they can still function as a cloth. For this reason, various weft insertion error detection methods have been proposed.
One example is a silk thread detection method described in Japanese Patent Publication No. 52-8904. Although this conventional method is an excellent technique for detecting weft insertion errors, it has some practical problems. This problem will be explained in detail later, but in terms of twill thread insertion, there is a latent possibility that a twill thread insertion error may be overlooked. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a method and apparatus capable of detecting a weft insertion error without overlooking the weft insertion error.

In accordance with the above object, the present invention includes a feeler that detects the presence or absence of insertion of weft threads that should be sequentially inserted substantially perpendicular to a large number of warp threads, and detects the occurrence of a twill thread insertion error signal detected by the feeler. In a loom in which the operation and stop of the loom are determined, if the number of occurrences of the striped thread insertion error signal does not exceed a predetermined number within a predetermined period of time, the loom continues to operate; If the number of occurrences of the signal exceeds the predetermined number of times within the predetermined time, the operation of the loom is stopped, and the silk thread insertion error signal is first detected during the predetermined time when the loom starts operating. The method is characterized in that the calculation starts from the time when the weft yarns appear, and in another aspect of the present invention, the insertion of the weft yarns to be sequentially inserted approximately orthogonally to a large number of warp yarns is performed. A flip-flop that is set by the striped yarn insertion error signal in a loom that is equipped with a feeler that detects the presence or absence of the weft yarn insertion error signal, and determines whether to operate or stop the weft insertion error signal based on the occurrence status of the weft insertion error signal detected by the feeler. a counter that counts the number of occurrences of the silk thread insertion error signal and outputs a carry signal to stop the operation of the loom when a predetermined number of times has been counted; and a predetermined time for defining a counting period for the predetermined number of times. a clock control circuit, the flip-flop activates the counter and the clock control circuit each time it is set, and the clock control circuit resets the flip-flop and activates the counter every time the predetermined time elapses. The counter and the flip-flop are also reset by the carry signal.

FIG. 1 is a schematic diagram schematically showing the general configuration of a loom to which the present invention is applied.

In this figure, 101 is a yarn beam, and a large number of ridges 102 are wound in parallel. These warp yarns 102 reach a warp fixing device 105 via a back roller 103 and a tension roller 104. The warp stop device 105 is
Each warp thread has a dropper (not shown), and when one of the warp threads breaks, the corresponding dropper detects this.
Start operations such as stopping the machine. The warp that has passed through the device 105 is pressed by the warp presser bar 106 while being pressed against the heald arm frame 1.
07-19107-2 are alternately divided into upper and lower halves to form Sekiguchi section 08. A weft is inserted into the entrance portion 108 at a high speed from a weft supply device (not shown), for example, a jet nozzle. Guidance for this insertion is provided by a weft insertion guide 110' provided on the sley 109. The weft thread is inserted into the weft insertion guide 1 from the front side to the back side as shown in the figure.
Fly within 10. A feeler (not shown) for detecting whether the flight was carried out reliably or not is placed on the back side of the figure. The sleigh 109 is also provided with a rocky shore 111.

The cloth 111 is struck to the right side in the figure by the swinging motion of the slay 109 to the twill into which the twill is inserted, and the cloth 11 is
form 2. Note that the slay 109 performs the above-mentioned swinging motion by a rolling shaft 114 via a slay sword 113, and the woven cloth 112 is rolled via a presto beam 115, a surf roller 116, and a press roller 17. It is wound up by rollers 118.

1 19 is a wound woven fabric.

The driving source for the above-mentioned operation is provided by a motor 120 and is transmitted to a driving pulley 122 via a motor pulley 121 to rotate a crankshaft 123.

This rotational driving force is applied to a predetermined location along the route of the wavy arrow in the figure. Note that the rotational driving force for the yarn beam 101 is transmitted via the transmission 124.
A feedback signal from the tension roller 104 is supplied along the route of the dotted waveform arrow in the figure. This is to give a predetermined tension to the warp i02. By the way, in the loom shown in FIG. 1, the present invention detects the presence or absence of insertion of twill yarns that are jetted from, for example, an air jet nozzle and are to be successively inserted into the striped yarn insertion guide 110, perpendicular to the warp yarns 102. Mention the part to do.

FIG. 2 is an enlarged plan view showing only the constituent parts of FIG. 1 to which the present invention is applied. In this figure, the warp threads 102 and the woven cloth 112 are the same as those shown in FIG. 1. However, the description of the guide 110 and the like is omitted. The opening 1 formed by the warp threads 102
08, striped yarns 21 are successively inserted.
In principle, it should be supplied without a single thread falling off.
Detected by. In addition, “This hotintarabbuta 25
Since it is advantageous to detect the signal only at the timing when it should appear, the striped yarn insertion error detection device 26 receives the timing signal TM for this purpose and outputs a weft insertion error signal E if there is a failure. do. Incidentally, it is a recent complication that the method of the present invention and the entire control, including the generation of the timing signal TM, are performed by a microcomputer.

This microcomputer is schematically shown at 130 in FIG. This is a signal line that should be connected to various 1/0 boats (lnp mountain/output boat). However, the method and apparatus of the present invention can be implemented using discrete hardware instead of this microcomputer (described later). When the full thread insertion error signal E appears, the loom should normally be stopped.

However, in reality, if such an error occurs with a low probability, the loom will not be stopped. This is determined by the quality grade of the fabric. As mentioned above, a typical example of the conventional method is shown in Tsubaki Kosho No. 52-8904. FIG. 3 is a time chart for explaining a weft insertion error detection method using the follow-up method. The procedure for this method is clear from column 11 of the same figure. The principle of this method is that if an error occurs a predetermined number of times (for example, 3 times) per unit number of revolutions N (this error is indicated by an Reset to zero. Also, error X occurs a predetermined number of times within unit rotation speed N.
If this does not occur, reset the rotation speed of the aircraft from N to zero. Although this method is sufficient to detect weft insertion errors, in reality it sometimes causes unexpected inconveniences.
Two examples of this disadvantage are illustrated in columns {2} and {3}. Looking at the first example, the second in the {2} column
If the error x is concentrated in the vicinity of the rotation set (rotation speed N→○) R, for example, a predetermined number of errors (3 times) will occur while the unit rotation speed is less than m rotations (N>m). ing. However, such three errors are undetectable. Also, looking at the second example shown in the third column, n'
When three errors occur before rotation (N), the loom stops S. Then, the inspection is started again up to the next unit rotation speed N. However, if two errors occur when the loom is restarted, the loom will not be stopped. However, when inspecting the original N rotations (indicated by dotted lines in the figure), errors actually occurred five times. It is also undesirable for such clustered errors to be overlooked. Therefore, the present invention aims to eliminate the drawbacks of this conventional method.

FIG. 4 is a time chart for explaining the method of the present invention. The principle of the present invention is that, instead of repeating the inspection periodically as in the conventional method, once a certain error signal 8 is received, the inspection is carried out within a predetermined time (T in the figure: , for example, the actual operating time, the amount of cloth to be wound, and the number of weft inserts), and the errors are counted a predetermined number of times (for example, three times), and such a predetermined number of times Unless there is an error, the inspection is apparently interrupted, and the same operation is repeated from the next error signal E that appears for the first time. In this figure, an inspection is performed for a predetermined time T after the first error x, but the loom does not stop because the error occurs less than three times. Furthermore, the subsequent inspection is suspended (period i in the figure). Then, when error X occurs, the inspection is restarted from there. The figure shows an example in which errors X occur three times within time t, and the loom is then stopped S. Even if the operation is resumed after this stop S, the inspection is apparently interrupted (second period i in the figure) and waits until the next error X occurs. According to the method of the present invention, inconveniences such as those occurring in columns {2} and 3' of FIG. 3 cannot occur. This is because the first error is always the starting point for inspection. It is also advantageous that a test interruption i is inserted. This is because it does not place an excessive burden on the hardware. The method of the present invention described above is based on the microcomputer 1
30 (FIG. 1) may be program controlled by
Alternatively, dedicated hardware may be provided for control.

FIG. 5 is a circuit diagram showing an example of a striped thread insertion error detection device according to the present invention.

In this figure, E is the aforementioned weft insertion error signal, and S is an operation stop signal for the loom. Error signal E is the second
The output from the device 26 shown in the figure is a flip-flop (F
F) Applied to the set input (SET) of 51 to set it. With this set, its Q output is
2 and clock control circuit 54 (EN of counter 52 is the count enable input).
When the counter 52 becomes active, its count input m
Each time signal E is input to , it advances. In addition, counter 5
2 becomes fully active, signal E (initial signal B
), a delay circuit 53 is provided. Based on the example shown in FIG. 4, this counter 52 sends out a carry signal from its carry output C when three signals E are received. This becomes a stop signal S for the loom. The counter 52 operates for a predetermined period of time (
Since the subsequent signal E is counted by T) in Fig. 4,
A clock control circuit 54 is provided for this purpose.

That is, each time it receives the Q output from flip-flop 51, it becomes active and forms a constant time T. Therefore, the circuit 54 includes a normal oscillation circuit and a gate circuit. After this certain period of time T has elapsed, the OR gate 5
5 to the reset input (RT) of the counter 62 to reset the counted value to zero (this is the case where no error occurs more than a predetermined number of times within a certain period of time T). If an error occurs more than a predetermined number of times during a predetermined period of time T, a stop signal S is sent out, thereby resetting the count value of the counter 52 to zero via the OR gate 55.

When a reset signal is output from the OR gate 55, the test is interrupted until the next error signal E is received. At RT, apply a reset.

Thereafter, when the first error signal E appears, the above procedure is followed to perform the test for a predetermined period of time. As explained above, according to the present invention, error detection can be performed without overlooking even one weft insertion error.
It becomes possible to always control fabric quality with high precision.

[Brief explanation of drawings]

1 is a schematic diagram schematically showing the general configuration of a loom to which the present invention is applied; FIG. 2 is an enlarged plan view showing only the constituent parts of FIG. 1 to which the present invention is applied; Fig. 3 is a time chart for explaining a conventional striped thread insertion error detection method, Fig. 4 is a time chart for explaining the method of the present invention, and Fig. 5 is a weft thread insertion error detection device based on the present invention. It is a circuit diagram showing an example. 102...Warp, 110...Striped thread insertion guide, 112...
...Cloth, 130...Microcomputer, 21...
...Striped thread, 26...Twill thread insertion error detection device,
51...Flip-flop, 52...
・Counter, 54... Cook control circuit, E・
... Twill thread insertion error signal, S ... Loom operation stop signal. Blinds 1 Figure 2 Figure 3 Symbol Figure 5

Claims (1)

[Scope of Claims] 1. A feeler is provided for detecting the presence or absence of insertion of weft threads that are to be sequentially inserted approximately orthogonally to a large number of warp threads, and the operation is performed based on the occurrence status of a weft thread insertion error signal detected by the feeler. and in a loom whose stop is determined, if the number of occurrences of the weft insertion error signal does not exceed a predetermined number within a predetermined time, the operation of the loom is continued; If the number of times exceeds the predetermined number within the predetermined time, the operation of the loom is stopped, and the predetermined time is the time when the weft insertion error signal appears for the first time every time the loom starts operating. A method for detecting a weft insertion error in a loom, characterized in that the calculation is started from . 2. It is equipped with a feeler that detects the presence or absence of the insertion of weft threads that are to be sequentially inserted substantially perpendicular to a large number of warp threads, and the operation and stoppage are controlled based on the occurrence status of the weft thread insertion error signal detected by the feeler. In the loom, a flip-flop is set by the weft insertion error signal, and a carry signal is provided which counts the number of times the weft insertion error signal has occurred and stops the operation of the loom when the number of occurrences of the weft insertion error signal is counted a predetermined number of times. A counter to output,
a clock control circuit for managing a predetermined time for defining the predetermined number of counting periods; each time the flip-flop is set, the flip-flop activates the counter and the clock control circuit; A loom characterized in that the flip-flop is reset every time a predetermined time elapses, and the counter is also reset, and the counter and the flip-flop are also reset by the carry signal. Weft insertion error detection device.