JPH03124843A - Method for detecting changeover of yarn feeding body - Google Patents

Abstract

PURPOSE:To detect changeover of knot and yarn feeding body and smoothly carry out control of weft-inserting condition in changeover and control of supplying motion by applying coloring to the vicinity of knot of yarns ranging between plural yarn feeding bodies and detecting the colored part. CONSTITUTION:Coloring is applied to a knot 9 of yarns ranging between plural yarn feeding bodies 21 and 22 and the colored knot part 9 is detected with a color sensor 11 provided between yarn feeding bodies 21, 22 and a length- measuring and storing device 4. Changeover of the knot and yarn feeding body 21, 22 is surely detected in non-contact state. Detection of knot which needs supply motion and changeover can also be carried out by applying coloring with a color different from the other knots to the vicinity of a knot of yarn feeding body which needs supply motion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for automatically detecting the switching state of a yarn feeder during weaving.

[Conventional technology]

In order to omit frequent replenishment operations of yarn supply bodies, a plurality of yarn supply bodies are attached to a loom in a tied state.

The invention of JP-A No. 63-42940 discloses that when the yarn feeder is switched, the pressure of the wefting fluid of the main nozzle, the fluid jetting period, etc. are automatically changed as wefting conditions. . Such control is based on the detection of the switching state of the yarn supply body.

Conventionally, in order to ensure the detection of switching, the yarn connected between two or more yarn feeders is interlocked with a detector such as a proximity switch or a limit switch, and two The thread is held with a clamper and the appropriate tension is applied.

In this case, depending on the type of thread, excessive tension may be applied to the thread at the time of switching, which may cause damage to the thread or breakage of the thread.

[Purpose of the invention]

Therefore, an object of the present invention is to prevent yarn damage and yarn breakage, and to reliably detect the switching state of the yarn feeder in a non-contact manner.

[Means for solving the invention]

With the above object in mind, the first invention, as shown in Embodiment 1 described later, provides coloring in advance near the knots of the threads connected between the yarn supplying bodies, and connecting the yarn supplying body and the length measuring storage device. A color sensor is provided in between, and by detecting the colored portion with this color sensor, the switching state of the yarn supply body can be detected.

Further, as shown in Example 2 described below, the second invention provides a method in which, among the colored parts, the colored part of the yarn supplying body that requires replenishment operation of the yarn supplying body is colored in a color different from other colors. ing. By identifying those colors, the color sensor
To distinguish between simple switching of yarn supply bodies and switching that requires replenishment operation.

Thereby, the replenishment operation of the yarn supplying body can proceed smoothly.

[Example 1] As shown in FIG. 1, this example 1 is an example in which only the switching of the yarn supply body is detected.

The yarn 1 for weft insertion is passed through a plurality of yarn feeders 21, for example, two yarn feeders 21.
．． 22, and is supplied to the length measurement storage device 4 via a balloon breaker 3 and two yarn guides 10. The length measurement storage device 4 measures the length of the yarn 1 by winding it around the outer periphery of a stationary drum 6 by the rotational movement of the rotating yarn guide 5, and stores the yarn 1 in a locking bin 7 until the weft insertion timing.

When the locking bin 7 retreats from the circumferential surface of the drum 6 at the weft-inserting timing, the main nozzle 8 for weft-inserting pulls out the unwound yarn l from the circumferential surface of the drum 6 and collects it together with the weft-inserting fluid. Insert the weft thread as a weft thread while the material is still unopened.

Here, the two yarn supplying bodies 21 and 22 are connected at a winding start portion and a winding end portion, and can be identified by coloring 9 of a suitable color different from the color of the yarn 1 between them. For example, an amorphous visible light type color sensor 11 is provided between the two yarn guides 10 between the yarn supply bodies 21 and 22 and the length measurement storage device 4. The color sensor 11 is connected to each input terminal of a comparator 14 together with a threshold value setter 13 via an amplifier 12. The output terminal of this comparator 14 is connected to the AND condition together with the loom operating signal.
It is connected to the AND circuit 15.

While the yarn 1 is being pulled out from the yarn supplying body 21, the color sensor 11 detects the color of the yarn 1n body and generates a color signal of a level corresponding to the detected color.

When the yarn feeder 21 is switched to a new yarn feeder 22 and the colored part 9 near the knot passes in front of the color sensor 11, the color signal of the color sensor 11 is different from the yarn 1n body, that is, the non-colored part. signal level. Then, the comparator 14 compares the level of the color signal corresponding to the coloring 9 with a threshold value preset by the setting device 3, and when the magnitude relationship changes, for example, the "H" level is switched. Generate a signal. As a result, when the AND circuit 15 is in the operating state, it passes the "H" level switching signal with the operating signal at the II H11 level as an input condition.
It is sent to a weft control device (not shown), etc. At this point, the weft insertion control device controls the yarn feeder 21, 22 by changing the fluid pressure and jetting period of the main nozzle 8.
Regardless of the switching, the arrival timing of the thread during weft insertion is controlled to a constant value.

[Embodiment 2] This embodiment 2 is shown in FIG. 2, and detects switching between the yarn supplying bodies 21 or 22, and detects when a certain group of yarn supplying bodies 21 is consumed. This is an example in which a replenishment operation is announced in preparation for replenishment of a new group of yarn feeders 22...2n.

Therefore, the colored sections 92 between the yarn supplying bodies 21.22 of the same group are colored the same color, for example, red (R), but the coloring 92 of the yarn knots between the groups is the same for each yarn supplying body 21.22. 22
It is colored in a color different from the color 91 of , for example, green (G).

Correspondingly, the color sensor 11 is of an amorphous integrated type with a spectral filter, and generates a color signal for each color R2O, and sends it to each of the two signal processing systems.

When yarn feeders 21, 22 switch within the same group, R
The serial AND circuit 15 generates a switching signal as in the first embodiment. In addition, a certain group of thread supply bodies 21
When the yarn feeder 22 of a new group is consumed and the yarn feeder 22 of a new group is used, the G-series comparator 14 generates a replenishment signal under the condition of an "H" level operation signal, and uses a lamp or buzzer to notify the user. The yarn feeder 22 is sent to the feeding position by operating the device 16 or by starting the automatic feeding device 17.

In addition, during manual replenishment, the mechanic etc. replenishes one or more groups of yarn feeders 21, 22 according to the operating state of this alarm 16, and ties the yarn l between these groups. By doing so, preparation is made for continuous supply of yarn 1.

Note that in order to reduce errors in color identification, three primary colors of light are appropriate as colors to be colored.

〔Effect of the invention〕

In the present invention, in the process of pulling out the yarn from the yarn supplier,
Since the color sensor detects the switching state of the yarn feeder without contact based on the coloring near the knot between the yarn feeders, excessive tension is not applied to the yarn during the detection process, and there is no damage to the yarn like in the conventional method. No more thread breakage.

In addition, by changing the coloring for switching and the coloring for requesting replenishment operation of the yarn feeder,
Depending on the color identification, it is possible to identify the switching state and the state that requires replenishment of the yarn feeder, so it is possible to not only control the wefting conditions associated with switching, but also control the replenishment operation and the necessary operations associated with it. It can also be used for advance notice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the first embodiment, and FIG. 2 is a block diagram of the second embodiment. 1... Yarn, 21.22...2n... Yarn feeder, 4... Length measurement storage device, 8... Main nozzle, 9.9192... Coloring, 11... Color sensor, 13... Setting device , 14...
Comparator, 15...AND circuit, 16...Alarm, 17...
・Automatic replenishment device.

Claims (2)

[Claims] (1) By applying color in advance near the knots of yarns connected between multiple yarn supply bodies, and detecting the colored portion with a color sensor installed between the yarn supply body and the length measuring storage device. A method for detecting switching of a yarn supplying body, comprising detecting a switching state of the yarn supplying body. (2) The area near the knot of the yarn feeder that requires a replenishment operation is colored differently from the other parts, and by identifying these colored areas, it is possible to identify the switching state of the yarn feeder and the state that requires a replenishment operation. A method for detecting switching of a yarn feeder, characterized in that detection is performed while distinguishing between the yarn feeders.