KR940010042B1 - Weft yarn feeler - Google Patents

Abstract

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Description

Weft detector

1 is a schematic structural diagram of one specific embodiment of the weft detection apparatus according to the present invention.

2 is a schematic cross-sectional view of a specific embodiment of the weft detector.

3 is a perspective view of the weft detector of FIG.

4 is a schematic structural diagram of one specific embodiment of a weft detection device in which a lens is mounted on an end face of an optical fiber bundle.

5 is a partially enlarged view showing an embodiment of the end face of the optical fiber bundle used in the weft detection device according to the present invention.

6 is a perspective view of one specific embodiment of the weft detecting device according to the invention inserted between the dents of the lid.

7 is a perspective view of one specific embodiment of the convex lens according to the present invention.

8 is a perspective view of one specific embodiment of a planar lens according to the present invention.

* Explanation of symbols for main parts of the drawings

1: weft detector 2: recess

3: sensor body 4: bundle of light emitting optical fiber

5: light receiving fiber bundle 4a: light emitting end

4b: light inlet 5a: light receiving end

5b: light exit port 6: light receiving module

7: light emitting module 8: support member

9: Amplifier 10: Output Terminal

11: input terminal 12, 13: lens

14: reed 15: dent

16: weft guide groove 17: main air nozzle

18: auxiliary air nozzle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detector for use in looms such as pneumatic looms, and more particularly to a weft detector for detecting wefts that are passed through a weft guide groove installed in a lid by transmitted light.

In general, the air jet loom consists of a dent of a plurality of leads which are kept parallel between the upper frame and the lower frame and protrude forward of the loom, and the recess is provided at the apex of the protrusion.

And the lid has a weft guide groove (weft ply passage) formed by the recesses of the plurality of lead dents.

The weft yarns are twisted in the loom by air injection from the main air nozzles installed on the weft throw-in (weft inlet) side of the loom and the auxiliary air nozzles installed on the weft guide groove shaft.

And whether or not the weft is inserted regularly is detected by a weft detector installed on the opposite side of the weft inlet side of the loom.

Several types of weft detectors have been proposed, but yet none of the weft detectors have sufficient detection capability, are unreliable and expensive.

For example, Japanese Patent Laid-Open No. 163448/1984 describes a weft detector in which a plurality of light emitting fibers and a plurality of light receiving fibers are bundled, respectively, which lead from the weft limit position of the weft guide groove opposite the weft entrance side. The bundles of optical fibers are inserted between the dents of the leads so that they lie in the weft guide grooves provided in.

This weft detection device is a reflective weft detection device in which the weft is detected by the action of the light emitted from the light emitting optical fiber is reflected by the weft yarn and incident on the light receiving optical fiber.

However, in this reflective weft detector (described in Japanese Patent Application Laid-open No. 163448/1984), in which the weft is detected by the reflection of light, the light is only slightly reflected by some kind of weft, for example, black and transparent weft. The device has low weft detection sensitivity and is generally unreliable.

A weft detector is also described in Japanese Utility Model Publication No. 138886/1981, which includes a pair of protrusions (left and right) of a weft detector member in which a weft detector (light emitter and receiver) is inserted between the dents of the lid. And a flexible printed wiring board attached to one side of the weft detecting member is electrically connected to the external control section through the flexible printed wiring board.

However, since the light emitting element and the light receiving element are directly installed in the detection section in this apparatus described in Japanese Utility Model Publication No. 13886/1981, the apparatus cannot be made thin and can not be inserted between the dents of the leads.

In addition, the size and shape of the element is limited by the size and shape of the lid, so that only a limited number of elements can be installed.

Therefore, it is difficult to accurately detect any change in the amount of light generated when a thin weft passes through the entire weft pass zone.

The leads are also moved back and forth during the weft throw-in process, pushing the weft yarns in the spaces between the reheated wraps.

Such movement of the lid in an air loom takes place at high speeds, such as 60 times / minute or more, but in the prior art no weft detection device has yet been developed that has a mechanical strength to withstand such an impact.

In the weft detection device described in Japanese Patent Application Laid-Open No. 104560/1985, two very thin total reflection prisms are inserted between the dents of the lid so that light from the prism crosses the weft passage so that the weft is detected.

The weft detector described in Japanese Patent Publication No. 104560/1985 has an optical element including two opposing prisms provided in the weft guide groove so that the weft is based on a change in the amount of light generated by the presence or absence of the weft. Weft detector by detected transmitted light.

Therefore, the device does not have any disadvantages of the reflective weft detector, but the amount of light is changed by the movement of the prism during the operation of the loom, and only the low proportion of the prism light is effectively used, so the weft detection sensitivity of such a device is low.

In addition, since the prism is expensive, the manufacturing cost of the device is high.

As described above, no weft detection device has been developed in the prior art with sufficient detection capability and reliability, easy handling and low cost.

The reason for this is as follows, the size and shape of the detection section is limited by the size and shape of the lead, which detection section hardly withstands more than 600 impacts per minute as described above, This is because it is difficult to prevent the adverse effects of dust sitting on the device when it is full.

The present invention has been made on the basis of the background art, and an object of the present invention is to provide a weft detection device, which can reliably perform weft detection, and inserts in a narrow space between the dents of the lid. It is attached to the lid and maintains sufficient detection capability even when it vibrates violently during operation, prevents dust from sitting on the equipment, and is an easy to handle and inexpensive weft detector.

In order to achieve the above object, the inventor has studied from various viewpoints and found the following facts.

The present invention has been made based on these facts.

If the weft detector is manufactured to have a shape similar to that of the dent lead and can be installed in a narrow space between the dents of the lid, the device can be protected from dust for the following reasons.

If the optical fiber is used in the light emitting and light receiving sectors, a thin weft detection device can be obtained in a narrow space between the dents of the lid and having excellent detection ability and anti-shake capability.

If the optical fiber bundle, the light emitting module, the light receiving module and the like are integrated in the sensor body having a shape similar to that of the dent of the lead, it is effective to achieve the above object.

If the lens is attached to the light emitting and receiving ends of the optical fiber, the exposed end of the optical fiber is more effectively protected from dust and prevented from damage during cleaning. By the use of convex lenses, light is focused to increase the weft detection sensitivity.

평 If flat lenses are used, the above effects can also be obtained except for the effect of focusing light.

The objects and features of the present invention will become apparent from the following with reference to the accompanying drawings.

Specific embodiments of the present invention are described below with reference to the accompanying drawings.

The weft detecting device according to the present invention is a device for detecting a weft which is passed through a weft guide groove formed on a lid of a loom by light transmitted through the weft guide groove, and the weft detection device is composed of:

A thin plate-shaped sensor body having a recess shape substantially the same as the shape of the recess of the dent of the lead corresponding to the weft guide groove, and inserted between the dents of the lead; A light-emitting optical fiber bundle and a light-receiving optical fiber bundle each having a plurality of optical fibers arranged in one row or strings, each of which is disposed at a light emitting end and a light receiving end positioned at opposite ends of the concave portion of the thin plate-shaped sensor body having a weft guide groove. ; A light receiving module connected to a light exit end of the light receiving fiber bundle; A light emitting module connected to a light inlet end of the light emitting fiber bundle; A support member attached to the loom and attached to the loom by integrating a thin plate-shaped sensor body, the two types of optical fiber bundles, a light emitting module and a light receiving module; And a planar lens or a convex lens attached to each end surface of the light emitting optical fiber and the light receiving optical fibers if necessary.

In one preferred specific embodiment of the present invention, the plurality of light receiving ends and the light emitting ends constituted by the respective optical fiber ends in the plurality of optical fiber bundles are in close contact with each other in one line or row on each end surface of the recess provided in the thin plate-shaped sensor body. In such a way that the light passes through the entire cross section of the weft guide groove.

In another preferred specific embodiment of the present invention, the optical fiber may be a plastic optical fiber which is economical and easy to handle.

According to the present invention having the above structure, the function of the weft detection device is described below with reference to FIG. 1, which shows one specific embodiment of the weft detection device according to the present invention.

The weft detection device 1 of this specific embodiment has a thin plate-like sensor body 3 having a recess 2 substantially in the shape of a dent of a lead, in particular a shape of a weft guide groove, a light emitting optical fiber bundle ( 4) and the light-receiving optical fiber bundle 5, the light-emitting end 4a of the light-emitting optical fiber arranged in one line or row on the end surface of the concave portion, the light-receiving end 5a of the light-receiving optical fiber, and the light outlet of the light-receiving optical fiber bundle 5 ( It consists of a light receiving module 6 connected to 5b), a light emitting module 7 connected to a light inlet 4b of the light emitting optical fiber bundle 4, and a support member 8.

The support member 8 in the weft detecting apparatus according to the present invention integrates a thin plate-shaped sensor body 3, two optical fiber bundles 4 and 5, a light emitting module 7 and a light receiving module 6. The optical fiber bundles 4 and 5 are all fixed to the support member during use, installation, separation and repair.

In the air blasting loom, the weft yarn is plyed by a transfer medium such as air from the weft inlet side along the weft guide groove to insert the weft yarn.

By the weft insertion, the weft thread reaches the weft detector installed at the end of the weft insertion unit.

When the weft is reached there, the weft is cut at the end of the weft inlet and the next weft is thrown in.

According to an electrical signal output from an external control circuit (not shown), the light emitting module 7 transmits the detection light from the light emitting optical fiber bundle 4 to the light emitting end 4a in which the ends of the light emitting optical fiber are arranged in one line or lines. .

The transmitted detection light passes through the space in the recess (weft guide groove) to reach the light receiving end 5a in which the ends of the light receiving optical fiber are arranged in one line or rows, and the light receiving end 5a is aligned with the light emitting end 4a. On the side.

At the same time, since the recess 2 has a shape substantially the same as the shape of the dent portion of the lead corresponding to the weft guide groove, no turbulence occurs in the inner space of the weft guide groove and the broken pieces of the fiber are recessed. It is prevented from accumulating in (2).

The weft which passes through the detection zone in the recess 2 blocks the detection light from the optical fiber so that the amount of received light is changed from the amount of light when the detection light is not blocked.

Light including the weft detection data is transmitted from the light receiving end 5a to the light receiving module 6 through the light receiving fiber bundle 5. In the light receiving module 6, the optical data signal is converted into an electrical data signal and output to the external control circuit. This signal, including the weft detection data, is processed by an external control circuit.

In the weft detecting apparatus according to the present invention, the optical fiber bundle is firmly disposed on the thin plate-shaped sensor main body 3 and the support member 8, and the light emitting module 6 and the light receiving module 7 are the sensor main body 3 and It is integrated with the support member (8).

Therefore, even if the weft detector is attached to the lid and shakes violently and repeatedly, the optical fiber is not bent separately by shaking, so that a stable amount of light is always emitted and can be received, and the sensor is a small amount of transmitted light generated by the presence of a thin weft. Even changes can be detected sufficiently.

Example 1

The weft detecting device according to the present invention is described in detail below by examples.

However, the scope of the present invention is not limited to this specific embodiment unless this specific embodiment contradicts the objective of this invention.

2 and 3 schematically show a first embodiment of the weft detection device according to the present invention.

Weft detection device 1 of this specific embodiment is a thin plate-shaped sensor body (3), light emitting fiber bundle (4), light receiving fiber bundle (5), light receiving module (6), light emitting module (7), support member ( 8), an amplifier 9, an output terminal 10 and an input terminal 11.

In this specific embodiment, the thin plate-shaped sensor body 3 has a shape similar to that of the dent lead of the air jet loom (not shown) and is thin enough to be inserted into the space between the dents of the lead.

The lid has a recess in the dent of the lid to form a weft guide groove, and the thin plate-shaped sensor main body 3 according to the present invention has a recess 2 of substantially the same shape as the recess of the dent of the lid. Have

This recess 2 has opposing upper end faces 2a and lower end faces 2b with spaces for the weft guide grooves.

The sensor body 3 may be made of any material as long as it can secure and protect the optical fiber bundles 4 and 5 housed in the sensor body 2, but preferably the sensor body is made of metal, plastic, It is made of a material having sufficient mechanical strength, such as a composite material.

In this specific embodiment, the light emitting ends 4a, in which the end faces of the light emitting optical fibers 4 are arranged in one line or in rows, are installed perpendicular to the lower end face 2b, while the end faces of the light receiving optical fibers 5 are in one line or The light receiving end 5a arranged in rows is provided perpendicular to the upper end surface 2a.

The optical fiber bundles 4, 5 according to the invention can be of organic or inorganic material if they can have the above functions to transmit light.

Preferably, however, the optical fiber bundle is a plastic fiber that is flexible, easy to handle and use, and inexpensive.

The optical fiber bundle according to the present invention consists of a plurality of optical fibers, and the method of arranging the optical fibers at the end faces 2a and 2b is, for example, for the purpose as shown in FIGS. 5a, 5b and 5c. Can be appropriately selected accordingly.

However, in order to increase the photosensitivity of the sensor, a plurality of optical fibers are preferably arranged in intimate contact with each other in one or a plurality of lines as shown in FIGS. 5B and 5C.

At the opposite end of the light receiving end 5a of the light receiving optical fiber bundle 5, that is, at the end of the mineral oil outlet of the light receiving optical fiber bundle 5, the input of the light receiving module 6 is provided while the output of the light receiving module 6 is connected to the preliminary amplifier. It is transmitted to the output terminal 10 through the same amplifier (9). The output of the light receiving module 6 is transmitted to the output terminal 10 through an amplifier 9 such as a preliminary amplifier. The light receiving module 6 includes a light receiving element such as an optical diode, a connector connecting the light receiving element and the optical fiber, and the like.

On the other hand, there is provided a light emitting module 7 connected to the input terminal 11 at the opposite end of the light emitting end 4a of the light emitting optical fiber bundle 4, that is, at the end of the light inlet of the light emitting optical fiber bundle 4.

The light emitting module 7 includes a light emitting element such as a light emitting diode (LED), a light emitting diode driving circuit and a connector connecting the driving circuit with an optical fiber.

The support member 8 of this specific embodiment is attached to the frame of the lid to support the support pillar 8a for holding the sensor body 3, the support box 8c for receiving the light receiving module 6 and the light emitting module 7 and It consists of a support plate 8b through which the amplifier 9, the optical fiber bundle 4, 5 pass, and hold the support pillar 8a and the support box 8c.

The support member 8 of this specific embodiment composed of the components comprises a sensor body 3, a light emitting fiber bundle 4, a light receiving fiber bundle 5, a light receiving module 6, a light emitting module 7 and an amplifier. Integrate 9).

The term " integrated " as used herein means that each integrated component is fixedly placed in a predetermined position each time the weft detection device is used, attached and demounted.

Therefore, the optical fiber bundle is not bent and not exposed so that the deterioration of quality can be prevented so that the amount of light required for weft detection can be maintained at a high level and high detection accuracy can be maintained.

In addition, the optoelectronic conversion element can be protected from dust and fiber fragments even when the loom is full of fiber dust in operation.

The operation and function of the weft detector of this specific embodiment is described below.

First, the weft detector of this specific embodiment is installed in the lid, and FIG. 6 shows the weft detector 1 in a state inserted between the dents 15 of the lid 14.

In this inserted state, the recess 2 of the weft detector 1 corresponds to the weft guide groove 16 formed by the recess of the dent 15 of the lid 14, where “17” in FIG. "18" represents an auxiliary air nozzle.

In the pneumatic loom, the weft yarn is plyed by compressed air, which is a transfer medium, from the inlet side of the weft along the weft guide groove, so that the weft is inserted.

By the insertion of such weft yarns, the front end of the weft yarns reaches the position of the weft detecting device 1 which is arranged on the opposite side of the weft inlet side.

The electrical signal is transmitted from an external control circuit (not shown) through the input terminal 11 according to the signal, the light emitting module 7 emits light through the light emitting optical fiber bundle 4 and the light emitting end of the light emitting optical fiber bundle 4. Transmit to 4a.

The light emitted from the plurality of light emitting ends 4a disposed on the end face of the optical fiber bundle 4 is sufficiently passed through the entire area of the space of the recess (weft guide groove) 2 so that the light emitting ends 4a The light receiving end 5a located on the opposite side is reached.

At this time, since the concave portion 2 has a shape substantially the same as the shape of the dent portion of the lead corresponding to the weft guide groove, no air turbulence is generated in the internal space of the weft guide groove and the breakage period of the fiber It is prevented from accumulating in this recessed part 2.

The weft that passes through the weft detection zone in the recess 2 blocks the detection light so that the amount of light received changes from the measured light amount when the detection light is not blocked by the weft.

The presence or absence of such a change in the amount of received light provides weft detection data, and the light including the weft detection data comes from the light receiving end 5a and reaches the light receiving module 6 through the light receiving fiber bundle 5.

In the light receiving module 6, the optical data signal is converted into a data signal, which is amplified by the amplifier 9 and then output to an external control circuit through an output terminal.

Signals including weft detection data are processed by an external control circuit, so the loom operates according to the weft detection data.

According to the present invention, one weft detection device may be installed on the opposite side of the weft inlet side as described in the above specific embodiment.

However, the present invention is not limited to this embodiment and can be applied in various ways. For example, at least two weft detectors may be installed sequentially on the opposite side of the weft inlet side.

In this specific embodiment, the first weft detection device is placed at the limit position where the throw-in weft is normally reached, and the second weft detection device may be installed at a position beyond the limit position.

In this specific embodiment, when only the first weft detecting device detects the weft, it may be determined that the weft is regularly inserted.

When the first and second weft detectors detect the weft, it may be determined that the weft is cut.

In addition, when neither the first nor the second weft detecting device detects the weft, it may be determined that the weft is not inserted in the direction.

Example 2

A second specific embodiment of the weft detection device according to the invention is schematically shown in FIG.

The weft detection device of the second specific embodiment shown in FIG. 4 except that the device has a lens 12 attached to the light emitting end 4a and another lens 13 attached to the light receiving end 5a. And having the same structure, function and effect as that of the first specific embodiment shown in FIG. 2, the functions and effects of the lenses 12 and 13 are described below.

In a first specific embodiment, at the light emitting end and the light receiving end of the optical fiber, the end of the optical fiber is exposed or coated with resin, wherein the light emitting and light receiving end face is not smooth so that breakage pieces of starch and pieces of starch lees It tends to adhere to the end face. Also, when fiber breaks and debris are cleaned clean, fiber ends often deteriorate or the resin discolors.

These surfaces are smoothed by attaching lenses 12 and 13 to the light emitting and receiving end surfaces.

Therefore, the broken pieces and the chips of the fibers are hardly attached to the end faces, and even if they are attached, they are easily and automatically removed from the ends by the air spray used to pass the weft.

In addition, when the exposed or resin-coated optical fiber end surfaces are repeatedly cleaned as described above, the end surface is deteriorated in quality and the coated resin is decolored, so that the weft detection sensitivity of the optical fiber end is adversely reduced. However, the weft detection sensitivity of the optical fiber ends to which the lens is attached is not degraded by cleaning.

Lenses 12 and 13 can be planar or convex lenses where the above effects can be obtained when planar lenses are used and convex lenses can focus light when convex lenses are used. In this case, therefore, a high weft detection sensitivity can be obtained so that even in the case of thin wefts, a sufficient S / N ratio can be obtained and a stable weft detection process can be achieved.

According to the present invention having the above structure, the following effects can be obtained.

(1) In the weft detection device as claimed in claim 1 of the present invention, when the weft is passed between the opposing optical elements, the two projected light can be passed through or blocked by the weft. Opposing optical elements are provided in the weft guide grooves. Since weft detection according to the present invention is based on the difference in the amount of light when light passes or is blocked by the weft, weft detection can be achieved with high photosensitivity and reliability.

(2) In the weft detection apparatus as claimed in claim 1, the optical fiber bundles are integrated with the support member, which is fixed and protected by the support member during use, attachment, desorption and repair. Therefore, even if the weft detector according to the present invention is attached to the lead of the air jet loom and shakes violently, the fiber bundle is not bent or exposed so that the degradation of quality can be prevented, and the amount of detection light is maintained at a predetermined high level, so that weft of high accuracy Detection can be achieved. In addition, since the light emitting module and the light receiving module are protected by the supporting member, the optoelectronic conversion element can be protected from dust and broken pieces of fiber even when the fiber dust is full on the loom, so that weft detection can be continuously achieved with high accuracy. have.

(3) In the weft detection device as claimed in claim 1, the recess provided in the sensor body has a shape substantially the same as the dent shape of the lead corresponding to the weft guide groove, and any air turbulence guides the weft. It does not occur in the space in the groove and no broken pieces of fiber are adhering to the corners of the recess. Therefore, the weft detector can be easily repaired, and the high accuracy of the weft detector can be maintained for a long time.

(4) In the weft detection device as claimed in claim 2, each end face of the concave portion has a plurality of light receiving ends or a plurality of light emission ends of the optical fiber so that light can sufficiently pass through the cross-section of the weft guide groove. It is provided with a tip. As a result, wefts passing through any position of the weft guide groove can be accurately detected, resulting in reliable weft detection.

(5) In the weft detection device claimed in claim 3, since the plastic fiber which is excellent in flexibility and processing, easy to handle and cheap is used, this device can be manufactured at low cost and economically.

(6) In the weft detector as claimed in claim 4, since the lens is installed at the ends of the light receiving and emitting optical fibers, fibrous dust and debris can be easily removed by the air jet used in the air jet loom. Can be removed automatically. As a result, stable weft detection capability can be obtained for a long time. In addition, the deterioration of the optical fiber caused by the cleaning can be prevented, and when using the convex lens, the convex lens focuses the light, so that the weft detection sensitivity can be further improved.

Claims (9)

A weft detector, in which a weft thread passing through the weft guide groove provided in the lid of the loom is detected by light passing through the weft guide groove, the shape of the dent portion of the lead corresponding to the weft guide groove is substantially the same. A concave portion having a shape, the sensor body having a thin plate shape inserted between the dents of the lid; Light emitting end 4a having a plurality of optical fibers and located at opposite end surfaces 2a and 2b of the recessed portion 2 of the thin plate-shaped sensor body 3 having a weft guide groove 2. And a light-emitting optical fiber bundle 4 and a light-receiving optical fiber bundle 5 having end faces arranged in one row or rows at the light receiving end 5a, respectively. A light receiving module 6 connected to a light exit end of the light receiving fiber bundle 5; A light emitting module 7 connected to a light inlet end of the light emitting optical fiber bundle 4; And a supporting member 8 that integrates the thin plate-shaped sensor body 3, the optical fiber bundle 4, 5, the light emitting module 7, and the light receiving module 6 and is detachably attached to the loom. Weft detector, characterized in. A plurality of light receiving ends and light emitting ends of the optical fibers in the optical fiber bundle are arranged in close contact with each other in a single row or in rows on the end faces 2a, 2b of the recessed portion 2, respectively. Weft detector. The weft detection device according to claim 1, wherein the optical fiber is a plastic optical fiber. Weft detection device according to claim 1, characterized in that the lenses (12) (13) are attached to the end faces (2a) (2b) of the recesses (2), respectively. 3. Weft detection device according to claim 2, characterized in that the lenses (12) (13) are respectively attached to the end faces (2a) (2b) of the recesses (2). 4. The weft detection device according to claim 3, wherein the lenses (12) (13) are respectively attached to end surfaces (2a) (2b) of the recesses (2). 5. Weft detection device according to claim 4, characterized in that the lens (12) (13) is a flat lens. Weft detection device according to claim 5, characterized in that the lens (12) (13) is a flat lens. Weft detection device according to claim 6, characterized in that the lens (12) (13) is a flat lens.

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