JPH0220222Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a device for detecting yarn switching for a plurality of yarn supplying bodies.

BACKGROUND OF THE INVENTION Generally, in a shuttleless loom, the terminal end of a yarn supplying body in use is tied to the winding start end of a spare yarn supplying body. Therefore, when the weft from one yarn supplying body is consumed, the loom continuously pulls out the weft from the spare yarn supplying body. When moving from the winding end of one yarn feeder to the winding start end of the next yarn feeder, it is necessary to change the operating conditions, especially the weft insertion timing, etc. in response to the change in the winding diameter of the yarn feeder. Ru. For example, the invention disclosed in JP-A No. 58-18446 detects the conversion from one ball of yarn to the next ball of yarn using an electrical signal, and temporarily changes the supply pressure of the blowing nozzle. . Such an electrical signal can be detected, for example, by a photoelectric switch.

Technical Problem However, when tying yarn between multiple yarn supply bodies and setting it at the detection position of the photoelectric switch, the photoelectric switch generates an erroneous signal. For this reason, such setting work is performed after the photoelectric switch is turned off. On the other hand, if fluff, etc. crosses the front surface of the photoelectric switch while the loom is operating, an erroneous signal is also generated, making it impossible to accurately detect the switching of the yarn feeder.

Purpose of the invention Therefore, the purpose of the invention is to prevent malfunctions during unnecessary periods, to nullify erroneous signals caused by lint, etc. during operation, and to realize accurate detection operations. It is to be.

Summary of the invention Therefore, the present invention predicts the yarn switching period in advance in relation to yarn consumption, invalidates the sensor detection signal outside of that period, and uses the sensor detection signal only during the switching period. I make it so that I can take it out.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings.

First, FIG. 1 shows an example in which a yarn feed switching detection device 1 of the present invention is incorporated into a weft insertion device 2 of a loom. This weft insertion device 2 is for weft insertion of the weft yarn 3, and is for weft insertion of one yarn supplying body 4a.
Or from the spare yarn supply body 4b through the yarn guide 5,
The weft thread 3 is drawn out, and a length measurement and storage device 6 measures the length of the weft thread 3 necessary for weft insertion, stores it, and then supplies it to a weft insertion nozzle 8 through a thread guide 7 during weft insertion.

The winding end of one yarn supplying body 4a is connected to the winding beginning end of a spare yarn supplying body 4b. Therefore, when the weft yarn 3 runs out on the yarn supplying body 4a, the weft yarn is automatically let out from the other yarn supplying body 4b. Note that this length measurement storage device 6 is dedicated or driven by a motor 9 of a loom.

The yarn feeding changeover detection device 1 of the present invention includes a sensor 10, a counter 11, and a switch 12 as main parts. The sensor 10 is
For example, it is a photoelectric type, and is composed of a light emitter 13 and a light receiver 14. These light emitting bodies 13 and light receiving bodies 14 are connected to two yarn feeding bodies 4a,
4b, which are optically opposed to each other with the weft thread 3 between them, and detect the movement of the weft thread 3 by blocking or passing light, detecting the switching of the thread feeders 4a and 4b, and outputting a detection signal A. occurs. This detection signal A passes through the output signal circuit 16 and the manual switch 15 and switch 12 interposed therein.
It is connected to the reset end of the counter 11 and the input end of a control circuit 18 for setting weaving conditions.

The counter 11 is of a preset type, and its preset input terminal is connected to a preset value setter 19, and its count input terminal is connected to a rotation sensor 20. This rotation sensor 20 detects the rotation of the loom, for example, the main shaft 21.
The rotation of the counter 11 is detected, a signal is generated every rotation or every few rotations, and this signal is sent to the count input terminal of the counter 11. Further, this counter 11 is connected to a relay 22 on the output end side. This relay 22 includes not only the switch 12 but also the light emitter 13.
switch 2 in the power supply circuit 23 between the
Controls on/off of 4.

Effects of the Embodiment Next, the effects will be explained with reference to FIG.

As already mentioned, the weft insertion device 2 pulls out the weft yarn 3 from the yarn supplying body 4a, continuously measures the length, stores it, and uses the weft insertion nozzle 8 at the weft insertion timing to convert the weft yarn 3 into a warp yarn. I'll put it on the road. In this case, the remaining amount L of the yarn feeder 4a is inversely proportional to the number of rotations of the loom, that is, the number of weft insertions. Therefore, the rotational speed No. of the loom when the weft yarn 3 is switched from one yarn supplying body 4a to the spare yarn supplying body 4b can be predicted in advance. Therefore, a rotation speed N having a value smaller than the rotation speed No. at that time is inputted to the counter 11 by the setter 19 as a preset value. This counter 11
When the value is other than "0", the relay 22 is de-energized. For this reason, the switches 12 and 24
Prediction period T for switching from rotation speed N to rotation speed No.
Otherwise, both are in an off state, and their output signal circuit 16 and power supply circuit 23 are in an open state. Therefore, even when fluff crosses the front surface of the photoreceptor 14 during a period other than the switching prediction period T, an erroneous signal from the sensor 10 will not be sent to the control circuit 18.

On the other hand, the counter 11 receives the rotation signal B from the rotation sensor 20 and sequentially subtracts the preset value. When the value of the counter 11 reaches "0", in other words, when the switching prediction period T begins, the counter 11 energizes the relay 22, thereby setting both the switches 12 and 24 to the ON state. do. At this point, the luminous body 13
irradiates light toward the photoreceptor 14, and the photoreceptor 14 is set to be able to send a detection signal A when it detects movement of the weft thread 3. shortly,
The weft yarn 3 is transferred from one yarn supplying body 4a to a spare yarn supplying body 4.
b, the sensor 10 detects the change by the movement of the weft thread 3 and generates a detection signal A. At this time, if the manual switch 15 is closed, this detection signal A is output to the output signal circuit 1.
The signal is sent to the control circuit 18 via the manual switch 15 of No. 6 and the closed switch 12. Here, the control circuit 18, in response to the switching,
Adjust the weaving conditions, such as the weft timing, to an appropriate time.

Further, this detection signal A is inputted to the reset terminal of the counter 11 as a reset signal.
Therefore, the counter 11, depending on the signal,
Automatically set to the original preset value. As a result, relay 22 becomes de-energized, switches 12 and 24 are set to the OFF state again. In this way, the detection signal A of the sensor 10 is valid only for the prediction period T of switching of the weft thread 3, and is invalid for other periods.
Malfunctions caused by wind, etc. can be prevented.

In addition, in preparing the yarn supplying bodies 4a, 4b, when tying the weft yarn 3, the manual switch 15 is set to the off state. By doing this, it is possible to prevent malfunctions even in the switching prediction period T.

Modified example of the invention In the above embodiment, the remaining amount L of the weft thread 3 is detected in relation to the rotation speed of the loom.
This can also be done by detecting a change in the winding outer diameter of the yarn supplying body 4a. Moreover, although the above embodiment describes two yarn supplying bodies 4a and 4b, the number of these yarn supplying bodies 4a and 4b may of course be three or more. Furthermore, for convenience of explanation, the above embodiments are as follows:
Although the counter 11 is shown as a component,
This counting function and the on/off of switches 12 and 24
The off operation function can also be realized by a computer function. Of course, sensor 10 is
Of course, it is not limited to a photoelectric type, and may also be a mechanical limit switch.

Effects of the invention In this invention, outside the yarn switching prediction period,
Since there is no need to set a manual switch to the OFF state, and the sensor signal is valid only during the expected switching period, malfunctions due to wind particles etc. outside of that period can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the yarn feed switching detection device of the present invention, and FIG. 2 is an explanatory diagram during operation. DESCRIPTION OF SYMBOLS 1... Yarn supply switching detection device, 2... Weft insertion device of a loom, 3... Weft, 4a, 4b... Yarn feeder, 5... Yarn guide, 6... Length measurement storage device, 7...
... Thread guide, 8 ... Weft insertion nozzle, 9 ... Motor, 10 ... Sensor, 11 ... Counter, 1
2...Switch, 13...Light emitter, 14...Photoreceptor, 15...Manual switch, 16...Output signal circuit, 17...Power supply, 18...Control circuit, 19...
Setting device, 20... Rotation sensor, 21... Main shaft,
22...Relay, 23...Power supply circuit, 24...Switch.

Claims (1)

[Scope of utility model registration request] A sensor that detects yarn switching between multiple yarn feeders tied at the ends, a sensor that detects yarn switching between these yarn feeders, and a drive signal that integrates the amount of yarn consumed and sends a drive signal during the prediction period of yarn switching. 1. A yarn feeding switching detection device comprising: a counter that generates a 100% change in output signal; and a switch that closes an output signal circuit of the sensor in response to the drive signal.