JPH02277858A - Weft detector in multi-color weft inserting weaving machine - Google Patents

Abstract

PURPOSE:To improve qualities of woven fabric and operating efficiency by equipping plural kinds of fillers, selecting a filler most suitable for the weft which is in weft inserting at present, outputting only a signal from the filler as a weft detecting signal and preventing overlooking of weft inserting error, etc. CONSTITUTION:At least two or more kinds of weft fillers of photoelectric type, electrode type, mechanical type, etc., are equipped in the vicinity of weft flying path at the opposite side of yarn feed. The fillers are connected to a switching device communicated with a weft selector to output a weft selecting signal corresponding to the kind of weft. Further a switching control circuit to output a change-over signal of the filler based on the weft selecting signal is connected to the switching device, the filler most suitable to properties of the weft in weft inserting at present is selected and only a signal from the selected filler is outputted as a weft detecting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a weft detection device in a multicolor weft inserting loom.

(Prior art and its problems) The weft yarn detection device uses one feeler to detect whether weft insertion is correct or not. , electrode type, photoelectric type, etc.

By the way, when the weft is a thin yarn, mechanical feelers detect the presence or absence of the weft by bringing a detection needle into contact with the weft, so the weft is likely to be cut during detection, making detection difficult. be.

Further, the electrode type is mainly used in water jet looms, and detects the presence or absence of weft insertion by bringing a flying weft wet with water into conductive contact between a plurality of electrodes. For this reason, in the case of yarn with a low moisture content, only a small energizing signal is obtained, and it is difficult to distinguish it from a signal caused by conductive contact with water in the atmosphere, making it difficult to detect whether weft insertion is correct or not. . That is, there is a possibility that a weft arrival signal may be erroneously output even though a weft insertion failure has occurred.

Furthermore, when the weft is a twisted yarn, the twisted yarn tends to become unruly, so stable contact cannot be obtained with an electrode type or photoelectric type feeler.
Difficult to detect. In other words, even though weft insertion has been performed normally, the weft thread tip is unsteady, so in the case of an electrode type, it may not touch the electrode, or in the case of a photoelectric type, it may come off the detection tilting mechanism, and the weft arrival signal may not be detected. It may not be output by mistake.

If the weft is a black thread and a rechargeable feeler is used, it is difficult to distinguish it from the background color, and it is also difficult to perform accurate detection.

As described above, since some yarn types are not suitable as feelers for weft insertion detection, it is necessary to decide on feelers while taking these into consideration.

However, in the case of multi-color weft insertion, when the properties of each weft yarn are different, it is difficult to accurately detect the weft insertion of all colors using one type of feeler. In other words, if a rechargeable feeler is installed in the weft detection device, there is no problem even if one color is a yarn with a low moisture content that is difficult to detect with an electrode feeler, but if the feeler of another color is When the thread is black, there are problems such as difficulty in detecting the black thread.

In this way, in the case of multi-color weft insertion, there is no feeler that perfectly corresponds to the yarn properties of all colors, making weft detection inaccurate in multi-color weft insertion, resulting in a decrease in fabric quality and 1. This resulted in a decrease in dynamic efficiency.

(Object of the Invention) This invention is a multi-color weft inserter, and the present invention provides a weft detection device that can reliably detect wefts for all colored threads even if a plurality of threads have different properties. The purpose is to provide

(Basic Structure of the Invention) In order to achieve the above object, the present invention provides a multi-color weft inserting loom with at least one or more of at least two types of feelers, each of which is most suitable for the properties of the weft thread currently being inserted. The basic configuration is to select only the signal from the feeler and output it as a weft detection signal.

(Example and its effect) In the following description, for convenience, it is assumed that four colors of weft yarns are used.

Near the weft flight path on the anti-yarn feeding side, as shown in the first section,
A plurality of feelers 1a-in are provided. These feelers 18 to 1n may be selected from at least two types from photoelectric type, electrode type, mechanical type, etc.
The output side of ~1n is connected to the input side of the switch 3.

On another input side of this switch 3, a switching control circuit 5 is provided which outputs a feeler switching signal to the switch 3 according to the type of weft.
It is connected to the. This switching control circuit 5 is connected to the output side of a weft selection device 7 which outputs a weft selection signal according to the type of weft being inserted.

In the following description, for convenience, three feelers of the same type are used.

First, the switching control circuit 5 receives a selection signal W1 output from the weft selection device 7, as shown in FIG.
~Rotary switch 51a connected to the output terminal of W4
~51d. Rotary switch 51a ~ 51
d has switching terminals a, b, and c, and these terminals a, b, and c are connected to the first to N3 OR circuits 53a to 53c, respectively.
11 are connected to the input side of the. As a result, the output terminals of each weft selection signal W1 to W4 are connected to each rotary switch 51a.
The first to third OR circuits 53a based on the settings of ~51d
~53d.

As shown in FIG. 2(B), the switch 3 switches the feelers 1a to
AND circuits 31a to 31c are provided corresponding to the number of 1c. The first AND circuit 31a includes the output terminal of the first feeler 1a and the OR circuit 5 in the switching circuit 5.
It is connected to the output terminal of output signal A1 of 3a. Second
, the input sides of the third AND circuits 53b and 53c are similarly
The output terminals of the second and third feelers Ib and lc are connected to the output terminals of the output signals A2 and A3 of the second and third OR circuits 53b153c in the switching circuit 5, respectively. The output terminals of these AND circuits 318 to 31c are respectively connected to the input terminals of the OR circuit 33, and the signal output from the OR circuit 33 becomes the weft detection signal FG.

Each of the feelers 1a to IC may be of a known type, each having a built-in signal processing circuit, and their output signals F1 to F3 are assumed to output "H" level signals when there is no thread. .

By the way, each of the feelers 18 to IC outputs signals F1 to F3 depending on the presence or absence of a weft yarn each time weft is inserted, but the feelers 1a to Signals F1 to F output from IC
3 is selected and the final weft detection signal F
It is output as O to a loom stop circuit (not shown). It is assumed that the loom stop circuit stops the loom when an "H" level signal is input.

That is, the signals A1 to A3 are transmitted to the first to third feelers 1a to I.
It functions as a signal to enable only one of C.

Next, the operation of the above embodiment will be explained using the timing chart shown in FIG.

Wefts output from each output terminal of the weft selection device 7.

It is assumed that one of the yarn selection signals W1 to W4 becomes the "H# level" for each rotation of the loom in accordance with the weft insertion order.

Rotary switches 51a to 51 shown in FIG. 2(A)
When d is set as shown, the first to third OR circuits 5
Output signals A1 to A3 of 3a to 53c alternatively output "H level" signals.However, each rotary switch 5
Among the terminals a, b, and c of terminals 1a to 51d, a signal of "L" level is always sent from the unconnected terminal to each OR circuit 1i3.
53a to 53c.

Then, when the weft of the first color (weft 1) corresponding to the weft selection signal W1 is inserted, the first feeler 1
Only the detection signal F1 output from a is valid. Similarly, when the second color weft (weft 2) corresponding to the weft selection signal W2 is inserted, only the detection signal F2 output from the second feeler 1b is valid, and the weft selection signal W3
When the weft of color 1J3 (weft 3) corresponding to 1J3 is inserted, the detection signal F output from the third feeler IC
Only 3 is valid. Furthermore, when the fourth color weft (weft 4) corresponding to the weft selection signal W4 is inserted, the first
Only the detection signal F1 output from the feeler 1a is enabled. Here, which detection signals F1 to F3 are to be enabled can be changed in any manner by setting the rotary switches 51a to 51d.

Now, detection signals F1 to F3 from each feeler 18 to IC
The following explanation assumes that is output as shown in FIG. still,
What is shown by the dotted line in Fig. 3 is a virtual threadless signal,
Since the positional relationships and detection formats of the feelers are different, they are shown as being output at different timings.

In the first cycle, when the weft is 1, all feelers 18 to IC detect the presence of yarn, and their signals F1 to F3
remains at the ``L'' level.

In the next cycle, when the weft yarn is 2, if only the second feeler 1b detects the presence of yarn, the signals F1 and F3 from the first and third feelers 'able will go to "H" level indicating that there is no yarn. Outputs the signal, but the signal F2 is “
It remains at L'' level.

Furthermore, in the next cycle, when the weft is 3, it is assumed that only the third feeler IC detects the presence of the yarn. Then, signals F1 and F2 are at "H" level indicating no thread, but
The signal F3 remains at the "L" level.

As mentioned above, the signals F1~ from each feeler 1a~1c
Since only one of F3 is enabled based on the signals A1 to A3 output from the control circuit, in the example shown in FIG. The detection signal FO remains at "L level" and does not stop the loom operation.

However, as shown by the dotted line in FIG. 3, it is assumed that the first feeler 1a detects that there is no yarn when the weft is 1. Then, the signal F1 goes to the "H" level indicating that there is no yarn, and the weft detection signal FO also goes to the "H"level; this signal FO is output to a weaving stop circuit (not shown) to stop the operation of the loom.

(Other Embodiments) In the above embodiments, each of the feelers 18 to IC operates constantly and outputs signals F1 to F3 in every cycle, and only one of the signals is output when the weft is currently being inserted. Only the signals from the feelers that were most suitable for the type of weft were selected and made valid.

However, the present invention is not limited to this, and it may be possible to select and operate only the feeler most suitable for the currently inserted color weft yarn in that cycle.

That is, as shown in FIG. 4, each of the feelers 18 to 1c receives the signal At-A from the switching control circuit 5 shown in FIG. 2(A).
It may be selected and activated only when step 3 is performed manually.

Further, as shown in FIG. 5, the weft selection signals W1 to W3 outputted from the weft selection device are directly applied to the AND circuits 31a to 31.
1c to one input terminal of each feeler 18 to IC.
The weft detection signal FO may be output only from the signal for which the AND condition with the signals F1 to F3 from the above is satisfied.

Further, in the embodiment shown in FIG. 4, the signals A1 to A3 outputted from the control circuit 5 are used to
Although the IC is selectively operated, the weft selection signals W1 to W4 are input instead of the signals A1 to A3.
It is also possible to selectively operate only the feelers 1a to IC after inputting the weft selection signal.

The weft selection device used in each of the above embodiments may be a mechanical type in addition to an electric type. In the case of a mechanical type, the pattern on the weft selection card is detected by a proximity switch or the like, and the weft It is only necessary to manually input the selection signals W1 to Wn to the switching control circuit 5.

In each of the above embodiments, the feeler used was one of a mechanical type, an electrode type, and a photoelectric type, but it is also possible to use at least two or more of these in combination to output their signals. Appropriate logical judgment (for example, when a thread-free signal is output from either
A method that detects the final presence or absence of a weft yarn (for example, Japanese Patent Laid-Open No. 50-15765)
No. 6) can also be used as one feeler.

(Effects of the Invention) According to the present invention, in the case of a multicolor loom, only the signal from the feeler most suitable for the type of weft inserted in each cycle is used as the weft detection signal, so whether the weft insertion is correct or not. You can now make more reliable decisions, and avoid mistakes when inserting the weft.
It is possible to effectively prevent empty weft insertion during normal weft insertion, and the quality of the fabric and the operating efficiency of the loom are greatly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a basic embodiment of the invention. circuit diagram. FIG. 2 (8) is a circuit diagram of the switch. FIG. 3 is a timing chart used to explain the operation of this invention. 4-6 are circuit diagrams showing other embodiments of the invention. 1a~IC...Feeler 5...Switching control circuit 3...Switcher 7...Weft selection device

Claims (1)

[Claims] A multi-color weft insertion loom is provided with at least two types of feelers, and only the signal from the feeler most suitable for the properties of the weft thread currently being inserted is transmitted from among the plurality of types of feelers. A weft detection device for a multicolor loom, characterized in that the device is configured to output a weft detection signal.