JPS6151059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a weft filler for a loom, and more specifically, by arranging a light emitting element and a light receiving element on the back side of a single rod lens, the present invention provides a weft feeler with a required width on the weft flight path. In addition to forming a weft illuminated area of This article concerns a new mechanism for the weft filler that has almost no reduction in illumination and light reception efficiency.

Conventionally, the weft filler mechanism in shuttleless looms uses a pair of light emitting element and light receiving element that face each other across the weft, and aligns the center line connecting the centers of both elements with the optical axis of the light beam. There is a well-known mechanism in which both elements are arranged so that the light flux is detected, and the weft is detected when the weft crosses the light beam.

However, in the above-mentioned known mechanism, in order to accurately detect a single micro-diameter weft thread, the optical axis of the light beam must be made to exactly match the center line connecting the centers of the light projecting element and the light receiving element. For example, when installing both elements on the race or the top of the reed, as seen in Japanese Patent Publication No. 55-3458, the optical axis of the light beam and the center line may become misaligned due to the reciprocating movement of the reed during operation. It is necessary to strengthen the holding member so that it does not go out of order, and the shape also becomes large.

In addition, when both elements are placed near the weaving opening without being attached to the lace or the upper part of the reed, as seen in, for example, Japanese Patent Publication No. 51-46189, the reed can overlap the weft due to the reciprocating motion of the reed. In order to cross the luminous flux in the state, the weft yarn crosses the luminous flux first before the reed crosses the luminous flux.For example, a fork rod is attached to the front of the reed so that the weft yarn can fly and reach the fork rod. , as the reed moves forward toward the woven fabric,
It is necessary to take measures to prevent the weft threads from overlapping and crossing the light beam by pushing the weft threads while being bridged by the fork rods, which results in a complicated mechanism and reduces the weave width of the woven fabric. When changing the width of the reed, not only both elements but also the front rod must be moved, which is inconvenient.

Furthermore, in the device described in Japanese Patent Publication No. 55-3458, the beam of light that crosses the weft thread is required to be orthogonal to the locus plane in which the weft thread moves from the time it is inserted until it is woven into the cloth. The light element and the light receiving element are arranged vertically, and in this case, the light emitting element or the light receiving element arranged below is likely to become contaminated with fluff, etc., and must be cleaned frequently to prevent malfunctions. , it was very annoying.

By the way, the applicant et al. "illuminates the shed where the weft is to fly (the weft flight path), and uses a light-receiving element to detect changes in the amount of illumination light that changes depending on the presence or absence of the weft in the shed under illumination. In the weft filler of a loom, which receives a detection signal in response to We have developed a weft filler for looms and have already applied for a patent (Japanese Patent Application No. 3680/1983). According to this weft yarn filler, the detection accuracy of the weft yarn is certainly improved, and the feeler itself can be surprisingly miniaturized. However, there were still some issues left unsatisfied with regard to obstacles caused by fluff, etc.

The present invention is a step forward from the weft filler disclosed in Japanese Patent Application No. 54-3680, and by concentrating the illumination light of the input element within a necessary range, a large illumination effect can be obtained with a small output, and The present invention aims to provide a high-precision weft filler that hardly causes any deterioration in detection accuracy due to fly fluff or the like by arranging the light emitting/receiving element on the back side of a single rod lens.

The present invention has been made in view of the current situation as described above.

That is, the present invention provides a weft feeler mechanism that detects the presence or absence of flying weft on the weft running path of a loom by using a combination of a light emitting element and a light receiving element. Bar lenses are arranged in parallel in the longitudinal direction, and on the back side of the bar lens there is a light emitting element that illuminates the weft flight path, and a light emitting element that illuminates the weft flight path that is irradiated by the light projection element and reflected from the reed blade surface. This is a weft filler mechanism for a loom, which is characterized in that a light receiving element that detects the amount of light that changes depending on the amount of light is installed side by side.

Next, the structure of the weft feeler mechanism of the loom according to the present invention will be explained.

First, each component of the feeler mechanism will be described.

A rod lens is a lens whose cross-sectional shape perpendicular to the axis is uniform, and it can be a cylindrical or semi-cylindrical single focal length lens, also called a cylinder lens, or a combination of these shapes. It is a focal line lens that does not have a lens effect in the axial direction but has a lens effect in a direction perpendicular to the axis.

The light projecting element is an incandescent light bulb, a semiconductor light emitting diode, or the like, and has a well-known structure that emits light when supplied with power.

Photodetectors include solar cells, phototransistors,
It is a photocell or the like, and has a well-known structure that converts an amount of light into an amount of electricity.

In addition, in the present invention, a light-shielding wall may be interposed between the projecting and light-receiving elements as desired, or the rod lens, the light-projecting and light-receiving element, and the light-shielding wall may be integrated into the housing. Here, a "light-shielding wall" is something made of metal or resin that blocks light and prevents it from passing through.Depending on the shape of the emitter/light-receiving element used, the light rays emitted by the light-emitting element may be directly directed from the emitter to the light-receiving element. Manufactured in a shape that prevents light from entering. In addition, the "casing" is used to fix and enclose the bar lens emitter, light receiving element, and light shielding wall so that their relative positions do not shift, and is made of materials such as metal or resin, and is made of lace. The casing itself is provided with a mounting part such as a mounting hole so that it can be mounted on the top or the top of the reed.

The details of the weft filler mechanism of the loom according to the present invention will be explained below using the drawings showing one embodiment thereof.

FIG. 1A is a perspective view showing the case where the housing is attached to the race of the air jet room.
A nozzle (not shown) for making the weft fly with air is arranged on the left side of the figure, and the casing 5 has a weft flight path (hereinafter simply referred to as " ) Nearby, facing the front of the reed, are the mounting holes 1 of the housing 5 as shown in Figure 1B.
6, a bolt 15 whose head can be locked into a groove 12 bored in the race 12 is passed through and fixed onto the race 12 with a nut 14. In this case, the rod lens is attached to the housing 5 with the peripheral surface of the rod lens 1 protruding from the front surface A of the housing 5 as shown in FIG. 1C.
is held in When fixing the housing 5 onto the race 12, the focal line of the rod lens 1 is adjusted to be parallel to the flight path in its longitudinal direction.

The light emitting/receiving elements 2 and 3 are arranged side by side on the back surface of the rod lens 1 as shown in FIG.

In addition, the lead wires 21 and 23 of the light emitting/receiving elements 2 and 3
are guided to the outside through the inside of the casing 5, respectively.

The light shielding wall 4 is provided between the light projecting element 2 and the light receiving element 3 as shown in FIG. This light shielding wall 4 is effective in preventing the light beam emitted by the light projecting element 2 from directly entering the light receiving element 3 from the light projecting element 2.

In FIGS. 1A, B, and C, when the weft is not flying, the light beam from the light projecting element 2 illuminates the flight path through the rod lens 1; The light is reflected by the 10 surfaces of the reed fins, enters the light receiving element 3 via the rod lens 1, and the light receiving element 3 outputs a photocurrent corresponding to the amount of reflected light from the 10 dent surfaces.

Next, when the warp threads 6 are opened and the weft threads are inserted normally, that is, when the weft threads fly along the flight path and reach the front surface of the rod lens 1, the amount of light incident on the light receiving element 3 changes. Therefore, the light receiving element 3 outputs a photocurrent corresponding to the amount of reflected light that has changed upon reaching the weft.

In this way, by using a circuit (not shown) means for amplifying and comparing the photocurrent due to the amount of light reflected from the 10 surfaces of the reed and the photocurrent due to the amount of light obtained when the weft reaches there, the weft The presence or absence of this is determined.

When the weft is white, the amount of change in the amount of light incident on the light receiving element 3 can be increased by increasing the contrast between the weft and the reed surface by making the reflective surface of the reed 10 black.

In the case shown in FIG. 2, the light emitting element 2 and the light receiving element 3 are arranged in series with respect to the axial direction of the rod lens 1. The same effect can be achieved even if the light transmitting element 2 and the light receiving element 3 are arranged vertically on the back surface of the rod lens 1 and a light shielding wall 4 is provided in the axial direction of the rod lens 1 as shown in FIG. 3. Effects can be obtained.

The light emitting/receiving elements 2 and 3 are arranged in such a position that the light emitted from the light emitting element 2 disposed on the back surface of the rod lens 1 and reflected on the inside of the front surface of the rod lens 1 does not enter the light receiving element 3. That is, the projected light projected from the light projecting element 2 and the projected light are reflected on the inside of the front surface of the rod lens 1, and the incident light entering the light receiving element 3 is different from the critical angle on the inside surface of the front surface of the rod lens 1. It can be placed in a small position. When the light emitting element 2 and the light receiving element 3 are arranged at a position where the angle between the projected light and the incident light on the inside of the front surface of the rod lens 1 is larger than the critical angle, the light is blocked as shown in FIGS. 4 and 5. The wall 4 may be extended to the front surface of the rod lens 1 to block reflected light reflected inside the front surface of the rod lens 1.

The invention configured as described above has the following excellent effects.

The first point is that detection accuracy is high because a rod lens is used. That is, when comparing the disk-shaped spherical lens 7 and the rod lens 1 as shown in FIG. 6, the weft detection range, that is, the range surrounded by the vertical fluctuation width a of the weft and the length b in the running direction of the weft. In this case, the rod lens 1 has less redundant detection area other than the weft detection range than the spherical lens 7, and the ratio of the light amount in the detection range to the total light amount is larger. The ratio of changes in light amount can also be increased.

In addition, in order to further increase the change in light intensity, the length b in the running direction of the detection range of the lens and the light emitting/receiving element
However, in the case of rod lens 1, it is only necessary to extend the length in the axial direction of the lens.
Since the diameter of a spherical lens increases, it also increases in the direction perpendicular to the flight path. Furthermore, even if the diameter of the spherical lens becomes larger, the ratio of the detection range to the total amount of light will not be improved.

The second point is that since a rod lens is placed in front of the light projecting element, the illumination light emitted from the light projecting element is focused on the focal line of the rod lens, and is emitted over a constant width along the weft flight path. Form a weft search area. Therefore, in the feeler of the present invention, a large illumination effect can be obtained with a small amount of light projection, and the control accuracy is correspondingly high.

The third point is that since the light emitting and light receiving elements are arranged side by side on the back of the rod lens, it is easy to attach it to the loom and it is also possible to make it smaller.

That is, the present invention adopts a method in which a light projecting element and a light receiving element are installed side by side, and the light beam emitted from the light projecting element is reflected on the reed blade surface and enters the light receiving element. Unlike the prior art method in which the light emitting element and the light receiving element are arranged facing each other across the weft, strict positioning is not required. There is no need for it and it can be easily attached to the loom. Moreover, compared to arranging the emitter and light-receiving elements facing each other across the weft, when the emitter and light-receiving elements are installed side by side, the spacing between both elements can be small, making it easier to downsize. It can be done. In addition, when installing a light-shielding wall between the light-emitting element and the light-receiving element, it is necessary to completely prevent malfunctions caused by the light emitted from the light-emitting element directly entering the light-receiving element. Detection using reflected light can be performed with high precision, and when the light emitting element and the light receiving element are arranged side by side, the distance between the two elements can be made extremely small even when a light bulb is used as the light emitting element. Miniaturization becomes possible.

The fourth point is that the rod lens, light emitting element, light receiving element, and light shielding wall provided as necessary are integrated into the housing and fixed, so the positional relationship of each component is fixed. At the same time, the attachment portion provided on the housing facilitates attachment and movement to the race or the upper part of the reed, and the feeler mechanism can be handled as a single unit.

Furthermore, in the present invention, the rod lens is installed parallel to the flight path in its longitudinal direction, and the jet flow that makes the weft fly is also in the axial direction of the rod lens, so that the rod lens has a smooth circumferential surface without any unevenness. Since the filter passes along the lens surface, the amount of fluff and the like attached to the lens surface is surprisingly reduced compared to conventional fillers, and the detection part no longer needs to be cleaned as frequently.

It should be noted that the present invention is by no means limited to the above-mentioned embodiments, and various modifications can be made within the scope of the claims, and the scope of application thereof is also considerably wide, including the jet method, shuttle method,
It can be used for various types of looms such as rapier type.

[Brief explanation of the drawing]

1A, B, and C are mechanical explanations of the present invention, in which FIG. 1A is a perspective explanatory view of the weft feeler mechanism of the present invention, and FIG. 1B is an installation example of the weft feeler mechanism of the present invention. FIG. 1C is a perspective view showing an example of the external appearance of the weft feeler mechanism of the present invention in a single unit.
FIGS. 2 and 4 are explanatory top views showing the arrangement relationship between the rod lens and the light emitting/receiving elements. Figures 3 and 5
The figure shows a rod lens and a projection lens. FIG. 2 is an explanatory side view showing the arrangement relationship between a light receiving element and a light shielding wall. FIG. 6 is an explanatory diagram showing the difference in detection range between the case of using a disc-shaped lens and the case of using a bar lens. 1... Rod lens, 2... Light projecting element, 3... Light receiving element, 4... Shading wall, 5... Housing, 6... Warp,
7... Woven fabric, 8... Fitting body, 9... Reed, 10...
Reed feather, 11... Upper part of the reed, 12... Lace, 13...
...Groove, 14...Nut, 15...Bolt, 16...
…Mounting holes.

Claims (1)

[Scope of Claims] 1. In a weft feeler mechanism that detects the presence or absence of a weft in the weft flight path of a loom using a combination of a light emitting element and a light receiving element, the weft yarn fly is located near the weft flight path in front of the reed feathers. A rod lens is arranged in the longitudinal direction parallel to the running path, and on the back side of the rod lens there is a light emitting element for illuminating the weft thread flight path, and a light emitting element for illuminating the weft thread flight path from the light emitting element and reflecting from the reed blade surface. A weft filler mechanism for a loom, characterized in that light-receiving elements that capture the amount of light that changes with the weaving are installed side by side. 2. A claim in which the rod lens is a positive cylinder lens having a focal line parallel to the weft flight path, and converges the illumination light emitted by the light projecting element into a band shape to form a weft search area with a required width. 1. The weft filler mechanism of a loom according to 1. 3. The weft filler mechanism for a loom according to claim 2, wherein the rod lens is a monofocal plus cylinder lens. 4. The weft filler mechanism for a loom according to claim 1 or 2, wherein the rod lens is a multifocal cylinder lens. 5 The light emitting element and light receiving element on the back of the rod lens are
The weft filler mechanisms for a loom according to any one of claims 1 to 4, wherein the weft filler mechanisms for a loom are arranged side by side in the same direction along the axial direction of the rod lenses with the weft flight paths facing in front. 6. A claim in which one of the elements is attached to the upper part of the back surface of the bar lens and the other element to the lower part thereof, so that the light emitting element and the light receiving element on the back surface of the bar lens are arranged vertically. Item 5. A weft filler mechanism for a loom according to any one of Items 1 to 4. 7. Claims 1 to 6, wherein the light projecting element and the light receiving element are set so that the light receiving element can receive the maximum amount of weft reflected light from the weft search area formed by the light projecting element via the rod lens. The weft filler mechanism of a loom according to any one of the above.