JP3241222B2 - Weft detection feeler in water jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detection feeler for a water jet loom, and more particularly, to a beating end of a weft fixed to the outer side of a woven fabric on a water jet loom on a side opposite to a yarn supply side. The present invention relates to an improvement in the reliability of a weft detection feeler of a type that detects the success or failure of weft insertion by guiding a portion to a detection area by upper and lower guide surfaces.

[0002] In this specification, "forward" refers to the feeler on the side of the weft flight path.

[0003]

2. Description of the Related Art A weft detecting device proposed in Japanese Patent Publication No. 57-13653 is known as a weft detecting feeler of the type described above. In this prior art, a light emitter / receiver, which is a sensor, is provided across a detection area defined by upper and lower guide surfaces. Further, in order to avoid a malfunction of the feeler due to the intrusion of the jet water into the detection area, a shielding plate is provided on the woven cloth end side of the detection area, that is, on the yarn supply side.

[0004]

In the case of this prior art, in order to completely prevent the injection of the jet water into the detection area, the lower end of the shield plate needs to be located at a position considerably lower than the lower guide surface which defines the detection area. There is. However, with such a configuration, the weft introduced into the detection area is greatly bent downward. As a result, the resistance to the weft increases, and the smooth movement of the weft is hindered. That is, the weft does not pass through the detection area at a necessary timing, and a malfunction in the detection of the weft easily occurs. Further, the resistance when the weft yarn is introduced into the detection area also increases. As a result, defective introduction of the weft to the detection area frequently occurs, which also causes malfunction of the weft detection feeler.

In view of the state of the prior art, it is an object of the present invention to effectively prevent the injection of the jet water into the detection area without increasing the resistance when the weft enters the detection area. Things.

[0006]

Means for Solving the Problems A shielding member is provided so as to be vertically movable, and at least at the time of guiding a weft to a detection area,
The gist is to move the shielding member in a direction such that the weft is guided in a substantially linear state.

[0007]

When the weft is inserted, the shielding area on the side of the yarn supply side of the weft detection area is completely shielded by the shielding member to isolate the detection area from the jet water. After the weft insertion is completed, the shielding member is moved at a timing when the weft is guided to the detection area by the beating motion, so that the resistance applied to the weft is reduced, and the weft can be moved smoothly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 to 5, the shielding member 6 constitutes the waterproofing device 1 in combination with the bracket 5 and the cover 7, and as shown in FIG. The whole weft detection feeler 8 is fixed to the side surface on the yarn feeding side by screws or the like. The weft detection feeler 8 is
Between the non-feed side weaving end of the woven fabric F and the catch cord,
As shown in FIG. 4, it is fixedly supported by a temple bracket 4 attached to a temple bar.

As shown in FIGS. 1 to 3, the bracket 5 of the waterproof device 1 is a substantially U-shaped member opened forward, and is provided between an upper lip portion 51 and a lower lip portion 52 extending forward. A substantially rectangular recess 53 that opens forward is defined. The upper surface of the lower lip portion 52 constitutes a lower guiding surface that defines the shielding area 9 on the yarn feeding side of the detection area.

A shielding member 6 is accommodated in the concave portion 53 of the bracket 5, and the lower surface thereof faces the upper surface of the lower lip portion 52 of the bracket 5, and forms an upper guiding surface that defines the shielding area 9. ing. As described later, the weight of the shielding member 6 is selected so as to be lifted by the contact with the tensioned weft W and not to hinder the movement of the weft.

A cover 7 is attached to the bracket 5, and the front and left and right sides of the concave portion 53 of the bracket 5 are covered with the cover 7. Therefore, the movement of the shielding member 6 in the concave portion 53 in the front-rear and left-right directions is restricted by the bracket 5 and the cover 7, but can move in the vertical direction in the concave portion 53.

Next, the operation of the weft detecting feeler 8 provided with the waterproof device 1 having the above configuration will be described. In a normal state, the shielding member 6 is lowered by its own weight in the concave portion 53 of the bracket 5, and is in contact with the lower lip portion 52 of the bracket 5 (the lower guiding surface of the shielding area 9). Therefore, the intrusion of the jet water from the yarn supply side into the detection area of the weft detection feeler 8 is completely prevented.

After the completion of the weft insertion, the inserted weft yarn W is carried to the cloth fell side with the beating movement. By this movement, the weft W is guided to the detection area 9 of the weft detection feeler 8.
At the same time, the weft is guided by the upper guide surface formed by the lower surface of the shielding member 6 of the waterproof device 1 and the lower lip 5 of the bracket 5.
2 and a lower guiding surface constituted by the upper surface of the two.

By the way, the shielding member 6 in this embodiment
Is in contact with the lower guide surface in a normal state so as to close the path of the weft W guided to the detection area of the weft detection feeler 8 from above. Therefore, when the weft W is guided to the shielding area 9 in this state, the weft W is bent downward by the shielding member 6. For this reason, the weft W
In order to guide in a substantially linear state, the shielding member needs to move upward. When the shielding member 6 is provided from below the path of the weft W, the shielding member 6 is moved downward.

In the embodiment shown, the shielding member 6
Is fitted to the waterproof device 1 so as to be movable in the vertical direction, and is merely lowered by its own weight in a normal state. Therefore, the insertion of the weft guided to the shielded area under a certain tension causes the shielding member 6 to be lifted upward. Moreover, the weight of the shielding member 6 is selected so as not to be a resistance to the insertion of the weft W and the movement of the weft W in the shielding area 9 as described above. Therefore, the resistance to the insertion of the weft W into the shielding area 9 is small, the weft W can move smoothly along the guide surface, and the risk of malfunction of the weft detection feeler 8 is extremely small.

At this time, even if the shielding member 6 is lifted by the weft W, the lifting distance is small (corresponding to approximately the thickness of the weft). This is not a problem. Therefore, it can be said that the influence of the jet water on the weft detection feeler 8 is almost negligible.

Since the weft W comes off the guide surface of the waterproof device 1 for each pick, the shielding member 6 is lowered by its own weight at a time other than the timing when the weft passes through the detection area of the weft detection feeler 8, and the bracket 5 The lower lip portion 52 is kept in contact with the lower lip portion 52, and the intrusion of the jet water is blocked.

The shielding member used in the present invention is not necessarily limited to the embodiment as shown in the drawings, and the shielding plate in the above-mentioned prior art may be freely fitted to a weft detecting feeler and configured to be vertically movable. Good.

In the above embodiment, if a suitable spring is attached to the bracket to urge the shielding member upward with a force weaker than its own weight, the force for lifting the shielding member by the weft will be reduced. Less is needed. As a result, the resistance applied to the weft can be further reduced.

In the above embodiments, the shielding member is lifted by the tension applied to the weft. However, instead of this, a mechanism for positively lifting the shielding member may be employed. That is, the shielding member may be lifted by a mechanical or electrical mechanism in accordance with the timing of insertion of the weft into the detection area.

For example, as an example of an electric lifting mechanism, the shielding member can be moved up and down by an electromagnet. The timing is detected by an encoder, etc.
When the weft is inserted into the detection area and passes, the electromagnet is operated, and the shielding member is raised by the thickness of the weft (or a slightly larger distance). If such a shielding member lifting mechanism is used, the resistance applied to the weft is completely eliminated, and the weft moves more smoothly.

Further, in each of the above embodiments,
The shielding member is arranged above the path of the weft and is configured to move upward. However, instead of this, it may be arranged below the path of the weft and move downward. In this case, the shielding member is urged upward by an appropriate spring or the like. With this configuration, the shielding member contacts the upper guide surface of the bracket to shield the intrusion of the jet water at a time other than the timing when the weft passes through the detection area of the weft detection feeler, and the weft passes through the detection area. In the timing, it is made to move downward by any of the above configurations. Furthermore, shielding plates may be arranged above and below the weft path, and the respective shielding plates may be moved up or down at the timing when the weft passes through the detection area of the weft detection feeler.

[0023]

According to the present invention, since the weft can be guided to the detection area without being bent at all, the resistance acting on the weft during guiding can be greatly reduced. Therefore, the weft passes through the detection area smoothly, and malfunction of the weft detection feeler can be effectively prevented.

In addition, in a normal state, since the water entry path into the detection area is shielded by the shielding member, it is possible to reliably prevent a malfunction caused by the intrusion of the jet water into the detection area.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing an example of a waterproof device provided with a shielding member of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a partially exploded side view of the same.

FIG. 4 is a side view showing an example of a mounting mode of the feeler and the waterproof device.

FIG. 5 is a plan view showing an example of an arrangement of a feeler and a waterproof device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproofing device 2 Cutter 3 Catch cord 4 Temple bracket 5 Bracket 51 Upper lip part 52 Lower lip part 53 Depression 6 Shielding member 7 Cover 8 Weft detection feeler 9 Weft induction area W Weft F Woven cloth

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D03D 51/18-51/46 D03D 47/32

Claims (2)

(57) [Claims] 1. A detection area which is defined by upper and lower guide surfaces and which detects the presence or absence of a weft leading end guided by a beating motion to determine the success or failure of weft insertion. A shielding member provided to shield the shielding area on the side and to prevent intrusion of the jet water into the detection area, wherein the shielding member is provided so as to be movable in the vertical direction. A weft detection feeler for a water jet loom, wherein the shielding member is moved in a direction such that the weft is guided in a substantially linear state at least when the weft is guided to the detection area. 2. The weft detection feeler according to claim 1, wherein the movement of the shielding member is performed by utilizing the tension of the weft induced.