JP3142676B2 - Weft detection feeler for 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 detecting feeler for a water jet loom, and more particularly, to a weft detecting feeler provided between a catch cord and an end of a woven fabric and defined within a detection area defined by upper and lower guide surfaces. To detect the success or failure of weft insertion by a water jet by guiding the weft to the weft, and to improve a weft detection feeler of the type equipped with a shielding member for preventing intrusion of a water jet extending vertically to cover at least the detection area. is there.

[0002]

2. Description of the Related Art In a weft detection feeler of the above-mentioned type used for a water jet loom, when a water jet for transporting a weft enters a detection area, the water jet becomes a kind of disturbance, resulting in a detection. It is easy to cause malfunction. In order to avoid such inconveniences, it has already been proposed to provide a shielding member for preventing a water jet from entering on the detection area woven fabric side of the feeler body.

A "weft detecting device" disclosed in Japanese Patent Publication No. 57-13653 is one of such proposals.
This is a weft detection feeler equipped with a photoelectric type detector, with a shielding member attached. FIG. 3 shows a schematic configuration thereof, in which a shielding member 2 for preventing intrusion of a water jet is provided on the detection area woven fabric side of the feeler body 1.
The weft W flying from the woven cloth side (not shown) reaches the catch cord 8 and is caught by the catch cord 3 at the position C, and engages with the weft engaging end of the shielding member 2 by the forward movement of the reed, and guides up and down. It is guided to a slit-like detection area defined by the surface.

FIG. 4 shows the flying state of the weft W at this time in more detail. The weft W from the end of the woven fabric first engages with the weft engaging end P of the shielding member 2, then engages with the feeler body 1 at the woven fabric side end Q of the lower guide surface, and receives light from the light emitter 12. The detector 13 is moved by the detector 13. The one-dot chain line in the figure is the normal weft flight line L, that is, the natural flight line of the weft W when the shielding member 2 is not provided.

[0005]

By the way, in order to prevent a water jet from entering the detection area as much as possible and to prevent a malfunction in detection, the shielding member 2 is usually positioned at a position exceeding the normal weft flight line L as much as possible. It has been extended to. In the illustrated example, the weft engaging end P of the shielding member 2 is set at a lower position as much as possible. Therefore, as is apparent 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 cloth side end Q of the lower guide surface. As a result, the resistance to the weft W increases, hindering its smooth movement, and as a result, malfunctions in detection often occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weft detection feeler for a water jet loom in which a shielding member for preventing a water jet from entering is provided on a woven cloth side of a detection area of a feeler body. It is to reduce the above malfunction.

[0007]

According to the present invention, there is provided a weft detecting feeler of the type having a shielding member for preventing intrusion of a water jet, the upper and lower guide surfaces being closer to the weft engaging end of the shielding member. One of the guide surfaces has its woven fabric 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 the woven fabric end is the starting point to the catch cord side. The gist of the present invention is to extend along the straight line or to be separated from the straight line.

[0008]

[Function] The weft inserted and caught by the catch cord moves in the detection area of the feeler body while engaging with the weft engaging end of the shielding member by the forward movement of the reed. Of these, the guide member is not bent at the weft side end of the guide surface closer to the weft engagement end of the shielding member, and is substantially linear from the weft engagement end of the shielding member to the catch position by the catch cord. Resistance to movement is reduced. In addition, since the woven cloth side end of the guide surface is located on the shielding member side in the vertical direction from the weft engaging end of the shielding member, the water jet does not easily enter the detection area. From the above, erroneous detection of the weft detection feeler is reliably reduced.

[0009]

FIG. 1A shows an example of a weft detecting feeler according to the present invention, which uses a photoelectric detector for detecting weft insertion. As in the conventional example shown in FIG. 4, a shielding member 2 for preventing intrusion of a water jet is provided on the woven cloth side of the detection area 11 of the feeler body 1. Further, in this case, of the upper and lower guide surfaces, the guide surface closer to the weft engaging end 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 Q of the lower guide surface is formed on a straight line PC connecting the weft engaging end P of the shielding member 2 and the weft catching position C of the catch cord. Starting from the side end, it extends obliquely along the straight line PC toward the catch cord. The upper guide surface extends obliquely in parallel with the lower guide surface. The light projector 12 and the light receiver 13 constituting the detector are arranged such that a detection optical axis therebetween is orthogonal to the guide surface.
Are located.

As a result of this construction, the inserted weft yarn W is not bent at the woven cloth side end Q of the lower guide surface,
It is substantially linear from the weft engaging end P of the shielding member 2 to the weft catching position C by the catch cord 3. In addition, the woven cloth 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, so that the water jet does not easily enter the detection area. Has become.

In the example shown in FIG. 1A, the lower guide surface has its woven fabric side end Q on a straight line PC connecting the weft engaging end P of the shielding member 2 and the weft catching position C by the catch cord. And extends from the woven fabric side end Q to the catch cord side along the straight line. However, the manner in which the guide surface extends is not limited to this. In short, the lower guide surface is a woven cloth side end Q formed on a straight line PC.
, And extends to the catch coat side so as not to go upward from the straight line PC. In other words,
It is only necessary that the woven fabric side end Q formed on the straight line PC be a starting point and extend to the catch coat side so as to be further away from the straight line PC.

FIG. 1B shows such an example. 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 located below the straight line PC connecting the weft engaging end portion P of the shielding member 2 and the weft catching position C by the catch cord with the woven fabric side end Q as a starting point (that is, from the straight line PC). Spaced apart).
Also in this case, the weft yarn W is not bent at the woven cloth side end Q of the guide surface. In this example, the light emitter 12 and the light receiver 13 are used.
Are arranged so 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 detecting feeler of a type in which two upper and lower shielding members 2b and 2a are used. In this case, the weft catching position C by the catch cord 3 and the weft engaging end P of the lower shielding member 2a.
Is a reference. Also in this case, the inserted weft yarn W is not bent at the woven cloth side end Q of the upper guide surface. In this example, the light projector 12 and the light receiver 13 have a detection optical axis between them, and the normal weft flight line L
Are arranged so as to be orthogonal to.

[0014]

According to the present invention, the weft inserted by the catch cord is not bent at the woven fabric side end of the guide surface that defines the detection area, and the weft by the catch cord is inserted from the weft engaging end of the shielding member. Since it is almost straight to the capture position, the resistance to the movement of the weft is reduced accordingly. As a result, smooth movement of the weft is guaranteed. In addition, since the woven cloth side end of the guide surface is located on the shielding member side in the vertical direction from the weft engaging end of the shielding member, it is difficult for the water jet to enter. From the above, erroneous operation of weft detection is reliably reduced.

[Brief description of the drawings]

FIG. 1 (A) is a cross-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 sectional front view showing an example in which the present invention is applied to a weft detecting 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]

 DESCRIPTION OF SYMBOLS 1 Feeler main body 2 Shielding member 3 Catch code 11 Detection area 12 Emitter 13 Receiver C Weft catching position by catch code L Regular weft flight line Q Woven side end of guide surface P Weft engaging end of shielding member W Weft

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-241150 (JP, A) JP-A-58-208445 (JP, A) JP-A-60-151348 (JP, A) JP-A 62-208 282046 (JP, A) JP-B-57-13653 (JP, B2) (58) Fields studied (Int. Cl. ⁷ , DB name) D03D 51/34 101 D03D 47/28-47/38

Claims (2)

(57) [Claims] 1. A provided between the catch cord and fabric end, and a feeler body having a sensing area defined by the vertical guide surface, spaced apart on the fabric side of the detection zone
A weft detection feeler of a type comprising a shielding member for preventing water jet intrusion and extending vertically to cover at least the detection area, and detecting the success or failure of weft insertion by guiding the weft into the detection area. And the guide surface closer to the weft engaging end of the shielding member among the upper and lower guiding surfaces connects the woven fabric side end thereof to the weft engaging end of the shielding member and the weft supplement position of the catch cord. A water jet having a straight line and extending from the woven fabric side end to the catch cord side along the straight line or apart from the straight line to the catch cord side Weft detection feeler for looms. 2. The weft detection feeler according to claim 1, wherein upper and lower guide surfaces defining a detection area are parallel to each other.