JPH027900Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a weft guide member used in a two-head type weft insertion detection device mounted on a fluid jet loom.

Prior Art In a fluid jet loom, two weft detection feelers (hereinafter simply referred to as fillers) are installed along the flight path of the weft to detect whether or not the weft has been properly inserted into the opening made by the warp. By placing one of them at a position where normally inserted weft threads can reach and the other at a position where normally inserted weft threads cannot reach, weft threads can be removed from the supply side. It works reliably not only when there is a weft insertion failure where only a part of the fabric is inserted, but also when there is a weft insertion failure where the middle part of the weave width is missing, which is called bodashi-nuki (or fukinuki). A two-head weft insertion detection device is known (Japanese Utility Model Publication No. 57-50303).

In this device, the interval between the upstream filler (hereinafter referred to as the first filler) and the downstream filler (hereinafter referred to as the second filler) along the flight path of the weft is equal to the second filler. Since it is necessary to prevent the filler from detecting the tip of a normally inserted weft thread, there is naturally a limit to the minimum value, and it depends on conditions such as the presence or absence of discarded selvedges, but at least It is normal to keep a distance of about 10 cm.

Conventionally, this was done between the first filler and the second filler to ensure that the tip of the weft yarn, which was cut during weft insertion and caused to be removed, could fly to the second filler. As a technique, an auxiliary weft transport nozzle is provided between both fillers, or a guide member having a tunnel-like or concave weft-flying guide groove with an open front side is installed between both fillers. In place of the reed feathers, a method attached to the reed frame (Japanese Unexamined Patent Publication No. 57-112437) has been proposed, but in the case of the former, as long as the weft insertion is performed normally, there is no contribution to weaving. The latter is uneconomical from the point of view of energy saving because it is necessary to provide an auxiliary nozzle that works effectively only in the rare case of defective body removal, and to constantly supply weft conveying fluid to this nozzle. Usually, a special guide member is attached in place of the reed feathers, so when changing the mounting position or spacing between the first filler and second filler due to changes in weaving width, etc., the reed feathers must be replaced. Unavoidable drawbacks include inconvenience in handling as the frame must be disassembled and reassembled.

Purpose of the invention In view of the actual state of the prior art, the purpose of this invention is to provide an extremely simple guide member between the first filler and the second filler and immediately upstream of the second filler. This eliminates the need for an auxiliary nozzle, which is economical from an energy-saving perspective, and it can also be easily attached to the reed frame or second filler support, making it easier to change the weave width. It is easy to handle even when
An object of the present invention is to provide a novel weft guide member for a two-head type weft insertion detection device.

Structure of the Device In order to achieve the above object, the structure of the device is to form a groove whose cross-sectional area gradually decreases in the weft flight direction on the inner surface, and to use this groove to connect the area immediately upstream of the second filler. By covering the weft thread flight groove on the reed wing at the part, the inner surface of the groove converges the flow of the weft transporting fluid that tends to spread, so that the tip of the weft thread that has undergone body removal is The second feeler is able to reliably capture and guide the fly, and its flying position is regulated by the flow of fluid along the concave groove whose cross-sectional area gradually decreases. This is the summary.

Example Examples will be described below with reference to the drawings.

The weft guide member 10 is supported by the attachment support 3b of the second filler 2b, and the weft guide member 10 is
It consists of a tunnel-shaped plate material that covers the weft flight grooves 4b formed in the weft thread a... (Figs. 1 to 3).

In FIG. 1, the weft is moved to the recess frame 4 by the weft transport fluid ejected from a nozzle (not shown).
A large number of feathers 4a, 4a supported by c, 4c...
The weft yarn flies in the direction of arrow A in the weft flying groove 4b formed in the weft yarn flying groove 4b. Reed frames 4c, 4c and reed wings 4a, 4a
...On the weaving side of the reed 4, there is a support 3a.
A first feeler (not shown) supported by a support 3b and a second feeler 2b supported by a support 3b are provided. The position of the first filler is a position that can be reached by the normally inserted weft yarn, and
The position of the second filler 2b is a position that cannot be reached by normally inserted weft yarns, and only weft yarns that have undergone so-called body removal can reach the position of the second filler 2b.

The weft guide member 10 has grooves 11 formed on its inner surface by forming a single plate into a tunnel shape.
(Figure 2). The inner surface shape of the groove 11 has a large opening 11a on the upstream side and a small opening 11b on the downstream side, and matches the peripheral wall of the truncated cone 12 just cut out along the axis 12a. (No. 4)
(Figure), its cross-sectional area S gradually decreases in the weft flight direction. A light emitting/receiving portion of the second feeler 2b, which is a reflective photoelectric sensor incorporated in the support 3b, is exposed on the downstream inner surface of the groove 11 (FIG. 2).

Now, the weft that has flown in the weft flying groove 4b by the weft transporting fluid ejected from the nozzle located further upstream of the first filler, as long as the weft insertion is performed normally, the tip of the weft will be It never reaches the second filler 2b. However, when the weft yarn is cut during the intermediate process of inserting the weft yarn and the weft yarn is cut off, the leading end of the weft yarn reaches the second filler 2b.

Thus, the weft conveying fluid flows through the weft guide member 10.
Although the weft threads tend to deviate from the weft running groove 4b because they are considerably diffused at the upstream position of the Therefore, the flow of the weft transporting fluid passes through the opening 11a and is converged along the inner surface of the groove 11. Therefore, the weft is also regulated by the flow of the weft transporting fluid and the weft thread guide member 10 and is reliably captured and guided by the grooves 11.

The weft transport fluid that has flowed into the inner surface of the weft guide member 10 flows through the weft flight groove 4b and the weft guide member 1.
The weft is discharged through the opening formed by the downstream opening 11b of the weft (Fig. 3), but the position of the weft at this time is along the flow of the discharged weft transport fluid, so the second There is no risk of deviating from the detectable range of the feeler 2b, and it can be reliably detected by the second feeler 2b.

Other Embodiments and Effects The weft guide member 10 may be a thick substantially semi-cylindrical member with a concave groove 11 formed on the inner surface (FIG. 5). Since the mechanical strength of the weft guide member 10 can be easily increased, the entire weft guide member 10 can be made durable.

The groove 11 may have a shape that lacks the opening 11b on the downstream side (FIG. 6). The inner surface shape of the concave groove 11 at this time matches the circumferential wall of the cone 13 cut out along the axis 13a (Fig. 7), and its cross-sectional area S is equal to that of the weft, as in the previous embodiment. By gradually decreasing in the running direction and exposing the second feeler 2b at a position corresponding to the apex of the cone 13, the flying position of the weft due to the convergence of the weft carrying fluid described above is changed to the second feeler 2b. Since the second filler 2b is more stable, the reliability of the operation of the second filler 2b can be further improved.

The weft guide member 10 can also be fixed to the reed 4 via a bracket 14 attached to the reed frames 4c, 4c (FIG. 8). The mounting position of the weft guide member 10 at this time is of course the immediate upstream side of the second feeler 2b supported by the support 3b, and not only the one shown in the figure but also all the shapes described above. Weft guide member 10
It is also applicable to Second filler 2b
Since it is not integrated with the loom, it is extremely easy to add it to an existing loom.

Although this invention is particularly effective for air-jet looms in which air as a weft transport fluid has a large tendency to diffuse, it can also be applied to water-jet looms, and when applied to the latter, It is also possible to use an electrode contact type sensor as the feeler instead of the photoelectric sensor.

Effects of the invention As explained above, according to this invention, a concave groove whose cross-sectional area gradually decreases in the weft flight direction is formed, and this concave groove is used to form the weft flight groove formed in the reed feather. 2
The area immediately upstream of the filler is covered, and the flow of the weft carrying fluid, which tends to spread, is converged on the inner surface of the concave groove, and the weft yarns that have been cut out along the flow of the weft carrying fluid are captured and guided. However, by ensuring reliable detection using the second filler, it is possible to eliminate the need to provide an auxiliary nozzle, which is economical from an energy saving perspective. Alternatively, it can be easily attached to the support of the second filler, and when changing the weaving width, it does not require disassembly and reassembly of the reed frame, making it easy to handle. effective.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment; Figure 1 is a perspective view of the entire assembly, Figure 2 is a perspective view of main parts, Figure 3 is a side view taken in the direction of arrow A in Figure 1, and Figure 4 is a concave FIG. 3 is a diagram illustrating the shape of a groove. FIG. 5 is a diagram corresponding to FIG. 2 showing another embodiment, and FIGS. 6 and 7 are diagrams corresponding to FIG. 2 and FIG. 4, respectively, showing still other embodiments. FIG. 8 is an assembled perspective view of main parts showing still another embodiment. 2b...Second filler, 4a...Osa feather, 4
b... Weft flight groove, 10... Weft guide member, 1
1...concave groove, 11b...opening, 12...truncated cone,
12a...shaft, 13...cone, 13a...shaft, S
...cross-sectional area.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a fluid jet loom, along the flying direction of the weft thread, there are two positions that can be reached by a normally inserted weft thread and a position that the weft thread cannot reach, respectively. , a weft guide member in a two-head weft insertion detection device including a first filler and a second filler, wherein a concave groove whose cross-sectional area gradually decreases in the weft flight direction is formed on the inner surface. and a weft guide member in a two-head type weft insertion detection device, which uses the concave groove to cover a portion of a weft flying groove formed in the reed blade immediately upstream of the second filler. 2. The two-head type utility model according to claim 1, wherein the groove has an opening on the downstream side and has an inner surface shape that matches the peripheral wall of a truncated cone cut out along the axis. A weft guide member in a weft insertion detection device. 3. The two-head weft insertion detection device according to claim 1, wherein the groove is closed on the downstream side and has an inner surface shape that matches the peripheral wall of a cone cut out along the axis. A weft guide member in. 4. The weft thread guide member in the two-head type weft insertion detection device according to any one of claims 1 to 3, characterized in that the weft thread guide member is formed integrally with the second filler. Guide member.