JPS605695B2 - Weft detection device for water jet looms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a water jet loom to check whether the striped yarns that are twilled by jetted water during weaving are correctly streaked within the warp opening □.
The present invention relates to a device for detecting whether or not the present invention is true.

In other words, this kind of twill yarn detection device detects that the weft yarn inserted into the warp opening □ by jetted water during weaving is
When it passes through the entire area of the twill yarn and reaches the opposite weft insertion side, it simultaneously contacts two weft detection electrodes installed on the opposite weft insertion side and to which a voltage is applied, and the moisture adhering to the twill yarn The weft insertion state is detected by conducting electricity between two electrodes.

That is, if the weft insertion is performed correctly, the two weft detection electrodes are electrically connected, and if the weft insertion is not performed correctly, the two weft detection electrodes are electrically disconnected.

However, if the detection device is defective, it may not be possible to correctly detect this twilling state. As a conventional striped yarn detection device of this type, the device shown in Fig.
7), and the device shown in Figure 2 (Special Publication No. 19
No. 583).

In Figures 1 and 2, a is coin, b is reed holder, w
is a weft yarn, and c and c' are twill yarn detection electrodes. In the apparatus shown in FIG. 1, a downward insulating tube d is provided above the stripe a, a striped thread detection electrode c is provided protruding below the insulating tube d, and an umbrella-shaped shielding plate e is provided above the electrode c. It's installed.

Note that electrode c' is an electrode on the ground side. However, in the device shown in Fig. 1, since the striped thread detection device is attached to the coin, during operation, the inertia force generated by its mass is applied to the upper part of the coin, and the amount of striped threads is increased near the attachment point. Because of this, people hold their beard while driving while waving their hair.

By the way, when the loom is started, the movement speed is low, so the amount of sagging is small and there is a difference from the amount of sagging, so there is a problem that the weft density in this part becomes small and a weaving step occurs. In addition, in the device shown in FIG. 2, the outside of the insulating tube d is held by the holder f and fixed to the lead holder b, so that the electrode bar g extends downward inside the hollow cylindrical insulating tube d. It emerges from its lower open end, is deflected laterally, and extends upwards to near the warp entrance.

A weft detection electrode c is fixed to the tip of the electrode birch g. By the way, in this device, in order to maintain the insulation state between electrode g and lead holder b (or holder f) for a long time, the distance between them has a great influence, so the length of the cylindrical part of the insulating tube d There are restrictions on making it shorter.

Therefore, since there is a limit to the length of the electrode bar g, the electrode bar g must have a predetermined length. However, since these insulating cylinder d, electrode array g, and electrode c reciprocate together with the muscle a, it is inevitable that they vibrate.

Then, when the electrode c vibrates, when the electrode c comes into contact with the twill yarn w, the weft yarn w is repelled, so that sufficient contact time is not obtained, resulting in false detection. In order to suppress the vibration of the electrode c, it is possible to shorten the length of the insulating tube d and the electrode ridge g, or increase the thickness of the electrode ridge g to increase the rigidity, but it is recommended to shorten the length. As mentioned above, due to the limitations mentioned above, sufficient effects cannot be expected, and if the electrode holder (g) is made thicker, the weight will increase significantly, creating an imbalance in the inertial force applied to the lead holder (b) and causing lead deflection. It becomes non-uniform and textured. Also, it cannot be adopted due to space constraints. The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional device, and the mounting portion of the pair of electrodes is fixed to a portion below the lead holder that reciprocates with the coin, and the pair of electrodes is It has an electrode covered with an insulator extending upward from the mounting part and an exposed electrode following the tip thereof, and at least the sensing part of the exposed electrode is between the upper part of the mounting part and the strip, and The purpose of this is to suppress the generation of vibration of the electrode by providing it almost parallel to the foundation on the weaving side and to prevent the manipulation of coins.
Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

In the figure, 1 is the thread sword of the loom, 2 is a reed holder installed horizontally on the upper part, 3 is a reed, 4 is a support plate for fixing the thread 3 to the reed holder 2, 5 is a warp, 6 is a weft, 7 is woven fabric, and 8 is woven fabric. A screw shaft 9a is provided protruding from the upper end of the round bar-shaped conductive shaft 9, and a terminal of an electric wire 10 is connected to the lower end by solder 11.

This electromagnetic conductor 9 is covered with an insulator except for the upper end of the screw shaft 9a. For example, as shown in the figure, between an inner cylinder 12a made of an insulating material such as synthetic resin, which encases the conductive shaft 9 and is formed so that only the screw shaft ga at the upper end is exposed to the outside, and this inner cylinder 12a. and an outer cylinder 12b forming an annular cavity S are integrated by a wall part 12c that makes the upper part of the annular cavity S a closed structure, and the lower part of the annular cavity S is closed to form an insulating cylinder 12. This insulating cylinder 12 is placed over the conductive shaft 9, and the exposed electrode 13 or 13' is fixed to the screw shaft 9a protruding from the upper part of the insulating cylinder 12 with a washer 14 and a nut 15. Then, the heat shrink tube 16 is attached to the electric wire 10.
The tube 16 is shrunk by covering the insulating tube 12 up to the middle part of the inner tube 12a and heating it.
a and the outer periphery of the electric wire 10. The one with the electrode 13 attached and the one with the electrode 13' attached as described above are arranged on the front surface of the coin 3 on the side opposite to the weft inserter, respectively, so that the electrodes 13 and 13' have an appropriate interval, and
A part that rotates back and forth five times together with the muscle 3, for example, the support plate 4
Fixing bracket 17 provided on the lower part of the lead holder 2
Inner cylinder 12a of insulating cylinder 12 covered by tube 16
Hold the lower mounting portion of the holder and secure it by tightening it with the washer 18 and screw 19. Note that 20 is a clamp for fixing the electric wire 10 to the support plate 4, and 21 is a set screw thereof. That is, the conductive shaft 9 is an electrode covered with an insulator, and extends upward from the mounting portion.Exposed electrodes 13, 13' are provided following the tip of the conductive shaft 9, and the exposed electrodes 13, 13' are The detection portion is located between the attachment portion and the coin 3, and has a portion that is substantially parallel to the coin 3 and is closer to the fabric front 7 than the stripe 3. As explained above, according to the present invention, the attachment part of the pair of electrodes is fixed to the part below the reed holder that rotates back and forth together with the machine, so it does not affect the deflection of the coin. There is an advantage that it is possible to prevent weaving steps caused by bending. Also,
Since there is no insulating tube on the top of the coin, operability during weaving is improved. In addition, due to the above structure and the structure in which the pair of electrodes is formed by an electrode covered with an insulator extending upward from the mounting part and an exposed electrode continuing to the tip thereof, the angular velocity during reciprocating rotation can be reduced and the inertial force can be reduced. Since it is made small, the vibration of the electrode can be suppressed, which has the effect of eliminating detection errors caused by repelling the weft yarn due to the vibration of the electrode. Furthermore, the detection part of the exposed electrode is located between the mounting part and the wire, and is located almost parallel to the wire and on the front side of the thread, and has an insulating part between it and the mounting part, so it is possible to suppress insulation deterioration. There is an advantage.

[Brief explanation of drawings]

Figures 1 and 2 are partially longitudinal front views of the follower device;
The figure is a front view of the device of the present invention, and FIG. 4 is a side view thereof. 1...Thread sword of the loom, 2...Reed holder, 3...Stripe, 4...Support plate for fixing the muscle, 5...Warp, 6 ...Weft, 7...
... Orimae, 8 ... Woven fabric, 9 ... Conductive shaft, 10 ... Electric wire, 12 ... Insulation tube, 1
2a...inner cylinder, 12b...outer cylinder, 12c...wall, S...
...Annular cavity, 13, 13'...Exposed electrode, 16...
Heat shrink tube, 17...Fixing metal fittings, 20...Clamp. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A pair of electrode mounting portions are attached and fixed to a portion that reciprocates together with the reed below the lead holder, and the pair of electrodes are covered with an insulator extending upward from the mounting portion; an exposed electrode following the tip thereof, and at least a detection portion of the exposed electrode is located between the upper part of the attachment part and the reed, and is located approximately parallel to the reed and on the side of the weaving side of the reed. Weft detection device for jet looms.