JPH06184880A - Weft detection feeler for water-jet loom - Google Patents

Abstract

PURPOSE:To decrease the malfunction of a weft detection means caused by the presence of a shielding member in a weft detection feeler for a water-jet loom provided with a shielding member at the inlet side of the detection zone of a feeler main body to inhibit the intrusion of water jet into the feeler. CONSTITUTION:Between upper and lower guiding planes, the woven cloth-side end of the guiding plane closer to the weft-engaging end P of a shielding member 2 is positioned on a line connecting the weft-engaging end of the shielding member 2 and a weft-catching position C of a catch cord and extended from the cloth-side end toward the catch cord along the straight line or in a state separated from the line. Since the inserted weft W captured with the catch cord is nearly straightly extended from the weft-engaging end P of the shielding member 2 to the catching position C with the catch cord without being bent at the cloth-side end Q of the detection region 11, the moving resistance of the weft W is decreased to an extent corresponding to the resistance caused by the bending.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detecting feeler for a water jet loom, and more specifically to a weft detecting feeler provided between a catch cord and a woven fabric edge and defined by upper and lower guide surfaces. The present invention relates to an improvement of a weft detection feeler of a type in which the success or failure of weft insertion by a water jet is detected by guiding the weft to the.

[0002]

2. Description of the Related Art In a weft detection feeler of the type described above used in a water jet loom, when a water jet for transporting the weft enters the detection area, the water jet becomes a kind of disturbance. It is easy to cause malfunction. In order to avoid such an inconvenience, it has already been proposed to provide a shield member for preventing the intrusion of a water jet on the sensing area woven fabric side of the feeler body.

The "weft detection device" disclosed in Japanese Patent Publication No. 57-13653 is one of such proposals.
A weft detection feeler equipped with a photoelectric detector is provided with a shielding member. FIG. 3 shows a schematic structure of the feeler main body 1, and a shield member 2 for preventing water jets from entering the detection area woven fabric side is attached to the feeler main body 1.
The weft yarn W flying from the woven fabric side (not shown) reaches the catch cord 8 and is caught by the catch cord 3 at the position C, and is engaged with the weft engaging end portion of the shielding member 2 by the reciprocating movement of the reed and then guided up and down. It is guided to a slit-shaped detection area defined by a surface.

FIG. 4 shows the flying state of the weft W in this case in more detail. The weft thread W from the woven fabric edge first engages with the weft thread engaging end portion P of the shielding member 2, and then engages with the feeler main body 1 at the woven fabric side end portion Q of the lower guide surface to receive the light from the projector 12. The detection area 11 is moved by the device 13. It should be noted that the one-dot chain line in the figure shows the normal weft flight line L, that is, the natural flight line of the weft W when the shielding member 2 is not attached.

[0005]

By the way, in order to prevent the water jet from entering the detection area as much as possible and prevent a malfunction in detection, the normal shielding member 2 is positioned as far as possible beyond the normal weft flight line L. Has been extended to. In the illustrated example, the weft engaging end portion P of the shielding member 2 is set to the lower position as much as possible. Therefore, as is clear from FIG. 4, the weft W is forced to be excessively bent at the weft engaging end P of the shielding member 2 and the woven side end Q of the lower guide surface. As a result, the resistance to the weft yarn W is increased and the smooth movement of the weft yarn W is hindered. As a result, a malfunction in detection often occurs.

An object of the present invention is to detect the presence of a shielding member in a weft detection feeler for a water jet loom, in which a shielding member for preventing water jets from entering the woven fabric side of the detection area of the feeler body is attached. The purpose is to reduce the above malfunction.

[0007]

Therefore, in the present invention, the guide surface closer to the weft thread engaging end of the shield member of the upper and lower guide surfaces has its woven fabric side end portion engaged with the weft thread of the shield member. It is located on a straight line connecting the end portion and the weft catching position of the catch cord, and extends from the woven fabric side end portion to the catch cord side along the above straight line or apart from the above straight line. What you are doing is the summary.

[0008]

The weft yarn, which has been inserted into the weft and caught by the catch cord, moves in the detection area of the feeler main body while engaging with the weft engaging end portion of the shielding member by the forward movement of the reed. Of these, the weft-side end of the guide surface closer to the weft-engaging end of the shielding member is not bent, but becomes substantially linear from the weft-engaging end of the shielding member to the catch position by the catch cord. Resistance to movement is reduced. Moreover, since the woven side end of the guide surface is located closer to the shielding member in the vertical direction than the weft engaging end of the shielding member, the water jet is less likely to enter the detection area. From the above, the false detection of the weft detection feeler is surely reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows an example of a weft detecting feeler of the present invention, in which a photoelectric detector is used to detect weft insertion. Similar to the conventional example shown in FIG. 4, a shield member 2 for preventing intrusion of a water jet is attached to the woven fabric side of the detection area 11 of the feeler body 1. Further, in this case, among the upper and lower guide surfaces, the guide surface closer to the weft thread engaging end portion P of the shielding member 2, that is, the lower guide surface is shown in FIG.
It is formed as shown in FIG. That is, the woven fabric side end portion Q of the lower guide surface is formed on the straight line PC that connects the weft yarn engaging end portion P of the shielding member 2 and the weft yarn catching position C of the catch cord, and furthermore, the woven fabric cloth. Starting from the side end, it extends obliquely along the straight line PC toward the catch cord side. The upper guide surface extends obliquely in parallel with the lower guide surface. In addition, the projector 12 and the light receiver 13 which constitute the detector are arranged so that the detection optical axis between them is orthogonal to the guide surface.
It is arranged.

As a result of such construction, the weft-inserted weft W is not bent at the woven fabric side end Q of the lower guide surface,
From the weft engaging end portion P of the shielding member 2 to the weft catching position C by the catch cord 3, it is substantially linear. Moreover, since the woven fabric side end Q of the lower guide surface is located on the shielding member side in the vertical direction with respect to the weft engaging end P of the shielding member 2, it is difficult for the water jet to enter the detection area. Has become.

In the example of FIG. 1 (A), the lower guide surface is on a straight line PC that connects the woven fabric side end Q to the weft engaging end P of the shielding member 2 and the weft catching position C by the catch cord. And is extended to the catch cord side from the woven fabric side end portion Q as a starting point along the straight line. However, the extension mode of the guide surface is not limited to this. In short, the lower guide surface is the woven fabric side end portion Q formed on the straight line PC.
It is only necessary to extend from the start point to the catch coat side so as not to go out from the straight line PC. In other words,
It suffices that the woven fabric side end portion Q formed on the straight line PC is the starting point and that it extends toward the catch coat side so as to be separated from the straight line PC.

Such an example is shown in FIG. In this case, the lower guide surface extends horizontally from the woven fabric side end Q formed at the same position as in the example of FIG. 1A to the catch cord side. That is, the lower guide surface is below the straight line PC that connects the weft thread engaging end portion P of the shielding member 2 and the weft thread catching position C by the catch cord, starting from the woven fabric side end portion Q (that is, from the straight line PC). Spaced apart).
Even in this case, the weft yarn W is not bent at the woven fabric side end Q of the guide surface. Further, in this example, the projector 12 and the receiver 13
Are arranged such that the detection optical axis between them is orthogonal to the lower guide surface.

FIG. 2 shows an example in which the present invention is applied to a weft detection feeler of a type in which two upper and lower shield members 2b and 2a are used. In this case, the weft engaging position P of the lower shield member 2a and the weft catching position C by the catch cord 3
The straight line PC connecting with is the reference. In this case as well, the weft yarn W inserted is not bent at the woven fabric side end Q of the upper guide surface. In this example, in the projector 12 and the light receiver 13, the detection optical axis between them is the regular weft flight line L.
Are arranged so as to be orthogonal to.

[0014]

EFFECTS OF THE INVENTION The weft yarn inserted into the catch cord is not bent at the woven fabric side end portion of the guide surface that defines the detection area, and the weft yarn is caught by the catch cord from the weft engaging end portion of the shielding member. Since it is almost straight to the catching position, the resistance to the movement of the weft is reduced accordingly. As a result, a smooth movement of the weft thread is guaranteed. Moreover, since the end of the guide surface on the woven fabric side is located closer to the shield member in the vertical direction than the weft engaging end of the shield member, the water jet is less likely to enter. From the above, malfunction of weft detection can be reliably reduced.

[Brief description of drawings]

FIG. 1 (A) is a sectional front view showing an example of a weft detection feeler of the present invention.

FIG. 1 (B) is a sectional front view showing another example of the weft detection feeler of the present invention.

FIG. 2 is a cross-sectional front view showing an example in which the present invention is applied to a weft detection feeler using two shielding members.

FIG. 3 is a perspective view showing the periphery of a weft detection feeler to which the present invention is applied.

FIG. 4 is a sectional front view showing a bent state of a weft in a conventional weft detection feeler.

[Explanation of symbols]

 1 Feeler body 2 Shielding member 3 Catch code 11 Detection area 12 Emitter 13 Light receiver C Weft catching position by catch code L Regular weft flight line Q Wedge side of guide surface P Weft engaging end of shield W W weft

Claims (2)

[Claims] 1. A feeler main body provided between a catch cord and a woven fabric end and having a detection area defined by upper and lower guide surfaces, and a water jet provided on the woven fabric side of the detection area of the feeler main body. A weft detection feeler of a type that includes a shielding member for preventing intrusion and detects the success or failure of weft insertion by guiding the weft into the detection area, and is close to the weft engaging ends of the shielding member on the upper and lower guide surfaces. One guide surface has its woven side end on a straight line connecting the weft engaging end of the shielding member and the weft catching position of the catch cord, and catches from the woven side end as a starting point. A weft detection feeler for a water jet loom, which extends to the cord side along the straight line or so as to be separated from the straight line. 2. The weft detection feeler according to claim 1, wherein the upper and lower guide surfaces defining the detection area are parallel to each other.