JPS59199844A - Weft yarn detector in shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft detection device for a shuttleless loom.

In a shuttleless loom (water jet type or air jet type loom), the weft threads are generally passed between the warp threads by a jet stream of fluid to perform weft insertion. At that time, due to various reasons, the weft threads may not fly normally, or they may come into contact with the warp threads on the way, resulting in the tip of the weft thread not being in the specified position (more than the weaving width).
Situations that cannot be reached occur suddenly and instantaneously.

In such cases, in order to stop the loom instantly, a fin (toucher) installed on the transparent surface opposite the jet nozzle detects the presence or absence of flying weft yarns and allows the loom to continue or stop operation. Is going.

The conventional filler that performs the above detection consists of two electrodes to which a high DC voltage is applied in advance, and when a water-containing weft touches the filler, conduction occurs between the two electrodes. It was used to detect the presence of weft threads.

However, since this method applies high voltage, there is a risk that the loom may run idle due to poor insulation during long-term operation, which may cause the loom to run idle. Regardless of the situation, malfunctions where the loom stops due to poor contact with the electrode surface, ■ Malfunctions due to poor contact due to corrosion of the electrode joints, ■ Maintenance and inspection of the electrodes,
It had many drawbacks such as difficulty in managing exchanges, etc.

Therefore, the present invention eliminates the above-mentioned drawbacks, and provides a weft yarn detection device that improves stability without losing high speed, simplifies the control sequence circuit, does not care about the type of yarn, and improves safety for workers. A light-emitting element is used to irradiate modulated or unmodulated light onto a weft thread that is fixed at a predetermined position, and the reflected light is captured by various light-receiving elements (photodiodes, phototransistors). This feature is characterized by detecting this.

The following will explain the embodiments shown in the figures.

Figures 1 and 2 show an example of a European-style optical fiber.
A locking guide (4) having a round-shaped receiving rod (3) (3) is fixed on the opposite surface of (2).

Then, when the weft (5) comes flying, the reed (1) that has been driven toward the front (woven surface) catches the weft (5) floating in the air and locks the tip of the weft (5). When the guide (4) is brought into contact with the n-type holder (3) (3) and the basket (1) approaches the paper surface, the weft (5) is in a stable position.
It fits into the corner of (3).

An optical fiber (6) for emitting light and an optical fiber for receiving light are connected to the weft thread (5) at the locking position of such a system guide (4).
- Place one end of (7) on the reed (1) surface, and place the weft (5)
) is irradiated with modulated or unchangeable light, and the reflected light is received and sent to an optical sensor (8) such as a photodiode or phototransistor through an optical fiber.

The optical sensor (8) and its electronic circuit detect reflected light.
) Outputs the state of "/" or "0" on the logic circuit.

This output and the electric signal from the nearby coil/110.0 synchronized with the rotation angle (9) of the reed (1) are sequence controlled by the wholesale circuit O.
By transmitting the information to O, the presence or absence of the weft (5) is detected and the loom is controlled.

The feature of this embodiment is that only the optical fiber and its optical system (condensing lens) are attached to the reed, and other electronic circuits can be identified separately, resulting in excellent water resistance, vibration resistance, and noise resistance. be.

Figure 3 shows a light emitting source such as a light emitting diode or incandescent lamp and a light sensor (8) installed on the same cylindrical surface without using an optical fiber, and modulating the weft (5) captured by the reed (1). , or emit unmodulated light, detect the reflected light with the optical sensor (8), and send the electrical signal to the electrical cable a.
3 to the sequence control circuit 00 of the loom main body.

A feature of this embodiment is that cost can be reduced.

Figure 1 shows a light emitting element (incandescent lamp, Zorcon lamp, arc lamp, laser beam and its optical system) fixed to the loom main body ll◆ that irradiates light from the Oa to the tied weft thread (5) from the vertical direction. On the other hand, an optical fiber (7) for receiving light or a light sensor (8) is placed on the cylindrical surface. As the reed (1) is ejected and approaches the paper surface, the weft (5)
When the beam crosses this light beam, the reflected light from the weft (5) is transmitted to the receiving optical fiber (7) or the optical sensor (8) on the part.
).

The features of this embodiment are that by making the light source more powerful, it is possible to reliably and easily detect light, and by chopping the light beam mechanically or electrically in synchronization with the movement of the reed (1), the proximity coil αQ The point is that it can be omitted.

However, in the case of a strong light beam, scattered stray light may occur inside the loom main body or from the cylindrical surface, so it is necessary to prevent the generation of stray light by using, for example, a black body pinhole α11.

As described above, the device of the present invention reliably guides and locks the incoming weft yarn to a certain position, and directly detects the presence or absence of the weft yarn at the locking position using a photoelectric method. This is a highly effective invention as it eliminates all of the drawbacks and achieves safe and reliable weaving.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the apparatus of the present invention, FIG. 2 is a side view of the same, and FIGS. 3 and 4 are front views showing other actual examples. Symbol (1) is the reed (3) is the 〉 type holder (4) is the locking guide (5) is the weft (6) (7) is the optical fiber (8) is the optical sensor. ◇ is the control circuit (6) is the light source O ◆ is the loom body

Claims (1)

[Claims] A weft detection device for a shuttleless loom, characterized in that a light receiving element detects, with a light receiving element, reflected light from a light emitting element that is irradiated onto a flying weft that is locked at a predetermined position by a locking guide provided on a transparent surface.