JPH0262622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a device for detecting a weft thread being flown by a jet of fluid in a weft guide path formed on the front surface of a reed.

(Prior Art) Generally, in a jet room in which the weft is inserted into the warp shedding using a jet of fluid, the insertion state of the weft has a great influence on the quality of the fabric. Therefore,
Conventionally, in order to detect whether the tip of the weft ejected from the main nozzle for weft insertion has reached a predetermined area, a weft yarn detector is installed between the woven fabric and the selvedge or outside the selvedge. This is commonly done. Such a conventional device is, for example, disclosed in Japanese Patent Application Laid-Open No.
-Disclosed in Publication No. 5947. In this conventional device, as shown in FIG. 5, a light emitting element 1 and a light receiving element 2 are installed in parallel in the direction of the weft guide path S, and a weft detector 4 has a rod-shaped lens 3 arranged in front of both elements 1 and 2. It is attached to the front of the ray 5, and the light projected from the light projecting element 1 is transmitted to the rod-shaped lens 3.
After being focused by, it hits the weft Y and is reflected,
This reflected light is collected by the rod-shaped lens 3 and then received by the light receiving element 2, thereby detecting the weft Y. That is, the purpose of this conventional device is to increase the change in the amount of light to increase the accuracy of weft detection.

However, the weft detector 4 designed to improve the weft detection accuracy is not used for the woven fabric W or the waste selvedge W1.
If the weft yarn is provided outside the weft yarn, an extra weft yarn must be inserted in order to perform reliable weft detection, leading to wastage of the weft yarn. Such wastage of weft threads is not compatible with the current situation where we are trying to eliminate wasted weft threads as much as possible. Furthermore, even in the case of a so-called end error, which does not need to be treated as an abnormality, in which the weft yarn Y does not reach the installation position of the weft yarn detector 4 but the woven fabric is normally formed, it is considered to be a weft insertion error. The operation of the loom is stopped. Such unnecessary shutdowns not only cause a decrease in the operating efficiency of the loom, but also increase the proportion of weaving steps in the woven fabric when the loom is stopped and started, which adversely affects the quality of the woven fabric.

In order to solve the above problems, it is sufficient to install a weft yarn detector within the weaving width area of the woven fabric.
Such a measure is not possible with the conventional device because it is not possible to separate the warp threads and enter the warp shedding.

(Problem to be Solved by the Invention) Therefore, it is conceivable to attach a light emitting element or a light receiving element to the tip of a support piece that can separate the warp threads and enter the warp opening, and detect the weft threads within the warp opening. . In such a weft detection mode, it is necessary to make the thickness of the support piece as small as possible in order to allow the support piece to smoothly enter the warp opening without damaging the warp threads, and therefore the thickness of the support piece must be as small as possible. Photoelectric elements are inevitably small-sized, and performance deterioration is unavoidable. Therefore, an object of the present invention is to provide a weft yarn detection device that can reliably detect weft yarns even within the warp shedding under the above-mentioned restrictions.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, a pair of support pieces that can separate the warp threads and enter the warp opening are arranged side by side in the weaving width area and spaced apart in the direction of the weft guide path. A light emitting element is provided at the tip of one of the support pieces, and a light receiving element is provided at the tip of the other support piece, and both of these light emitting and receiving elements are arranged close to the opening side of the weft guide passage. , the optical axes of both light emitting and receiving light elements are directed into the weft guide passage in a substantially parallel state, and the distance between the starting points of both optical axes is within 5 mm, and the intersection position of the optical axis and the wall surface constituting the weft guide passage is , the distance from the starting point of the optical axis was set to 8 to 13 mm.

(Function) That is, by arranging a pair of support pieces that can enter the warp opening in parallel and apart from each other in the direction of the weft guide path, a part of the separated warp is introduced between the support pieces and the warp threads are The handling becomes even. Therefore, the support piece enters the warp opening smoothly, warp damage is avoided, and the occurrence of warp streaks on the woven fabric is also prevented. or,
The distance between the starting point of the optical axis of the light emitting/receiving element placed near the opening side of the weft guiding passage and the intersection of the optical axis with the wall surface constituting the weft guiding passage is 8 to 13 mm, and the distance between the starting points of both optical axes is 8 to 13 mm. By keeping the distance within 5mm,
It is possible to provide the above-mentioned gap between both support pieces with small elements embedded in the tips of both support pieces, and regardless of the type or thread count of the weft of the optical axis of both light emitting/receiving elements. Weft detection can be performed with high accuracy simply by setting the wefts in a substantially parallel state.

(Example) Hereinafter, examples 1 to 4 embodying the present invention will be described.
This will be explained based on the diagram.

A reed 12 is provided on the sleigh 11 and has a function of guiding the weft Y ejected from a main weft insertion nozzle (not shown). That is, concave guide holes 13a are formed in the front surface of a large number of reed blades 13 constituting the reed 12.
is formed, and the weft Y is formed by the row of holes 13a.
A guide passage S is formed.

There are mounting grooves 1 on the front side of the Slay 11 in its longitudinal direction.
1a is formed, and a plurality of support blocks 14 (only one is shown in the drawing) corresponding to the reed 12 are slid along the mounting groove 11a to adjust the sliding position by bolts 15 and nuts 16 fitted into the mounting groove 11a. It can be tightened and fixed. An auxiliary nozzle 17 is inserted and fixed in the vertical direction into each block 14, and an injection hole 17a at the tip of the nozzle 17 is arranged near the weft guide path S.
The auxiliary jetting fluid from a assists the flight of the weft Y inserted into the weft guide passage S.

A weft detector 18 is installed on the front surface of the slay 11 at a position corresponding to the inside of the warp T group forming the woven fabric W (in this embodiment, near the fabric edge on the opposite weft insertion side in the weaving width area). Mounting groove 1 by 20
It is tightened and fixed so that the sliding position can be adjusted along 1a. The weft detector 18 includes a support piece 21, a bifurcated support 22 attached and fixed to the front left side of the support plate 21, and one support piece 22 of the support plate 22.
A light emitting element 23 embedded in the tip of the support piece 22b, and a light receiving element 24 embedded in the tip of the other support piece 22b.
and a substrate 25 having a circuit for amplifying the signal from the light receiving element 24.
A lead wire 26 connected to a light emitting output circuit and a control circuit (not shown) is connected to a terminal portion 25a formed integrally with the terminal portion 25a.

As shown in FIG. 3, a pair of support pieces 22a, 22
The optical axes L1, b of the light emitting/receiving elements 23, 24 are arranged parallel to each other in the direction of the weft guide path S, and are attached to the tips of the supporting pieces 22a, 22b.
L2 is set in a substantially parallel state. Support piece 2
The thickness l1 of the weft guide passages 2a and 22b in the S direction is set to within 4 mm so that the warp threads T group can be sorted and smoothly enter the warp opening, and the gap distance l2 between both support pieces 22a and 22b is set to 0.5 mm or more. There is. In addition, the distance l3 between the starting points of both optical axes L1 and L2 is set within 5 mm, and the intersection position of the optical axes L1 and L2 with the wall surface of the concave guide hole 13a constituting the weft guide path S and the optical axis Distance l4 (second
(shown in the figure) is set in the range of 8 to 13 mm.

Now, at the time of weft insertion, as shown in FIG. There is. The tip of the weft Y is a waste selvage W1
When normal weft insertion is performed in which the weft reaches the outer end position of Sent.
Therefore, weft insertion is determined to be normal, and weaving is continued. If the tip of the weft yarn Y does not reach the installation position of the weft yarn detector 18 for some reason, the projected light will not be reflected by the weft yarn Y, and the light receiving element 24 will not output a conversion signal. Therefore,
It is determined that a weft insertion error has occurred, and the operation of the loom is stopped.

By setting the thickness l1 and the distance l2 as described above, the support pieces 22a and 22b can smoothly enter the warp opening without damaging the warp threads T, and moreover, a part of the warp threads T that have been taken out can be Since the support pieces 22a and 22b are introduced into the gap between them, the warp yarns are handled uniformly, and no warp lines are generated on the woven fabric W. Both support pieces 22a, 22b
The distance l2 between them is set in consideration of the case where a thick thread is used as the warp thread T.

The distance l4 is the concave guide hole 13a of the normal reed feather 13.
The distance l3 is set in consideration of the size and shape of the support piece, and the distance l3 is based on the performance of the light emitting and receiving elements 23 and 24 that are large enough to be embedded within the thickness l1 of the support piece and the distance l4.
It was established in relation to That is,
Under such conditions, the inventor of the present application has determined that the optical axis L should be adjusted according to the type of weft or yarn count, etc.
Simply set the optical axis L1, L2 without particularly setting 1, L2.
It has been discovered that even when L2 is set substantially parallel, it is possible to extract a sufficient weft detection signal level to determine weft detection, and weft detection can be performed with high accuracy.

Figure 4 shows the distance l at which an output signal of the necessary signal level (indicated by K in the figure) can be obtained to detect the weft.
This is the data that investigated the range of 3, and the distance l4 is 10 mm.
This is the case when it is set to . As is clear from the figure, the output signal curve S exceeds the level K in the range l3≦5 mm. Note that when l4 becomes larger than 10 mm, the signal level of the output signal curve S decreases, but l4=
Distance l that satisfies level K even if the distance is about 13mm
3 is possible up to 5mm. In addition, when weft detection is performed within the warp shedding as in this embodiment, l3<2
In the mm range, warp threads can be sorted smoothly l2
It is not possible to ensure the size of Therefore, in the case of weft detection within the warp shedding, 2mm≦l3≦
5mm is desirable. Therefore, by setting the above conditions in advance, when the type of weft or yarn count is changed, it is possible to always detect the weft without having to consider troublesome adjustments such as alignment of the optical axis. It can be done with high precision.

It should be noted that the weft yarn detector of the present invention can of course be used outside the weaving width area as in the conventional case. In this case, no problem occurs even if l3≦2mm.

Effects of the Invention As detailed above, the present invention has the advantage that weft detection can be performed with high accuracy even within the warp shedding, regardless of the type of weft or yarn count, simply by setting the above-mentioned conditions in advance. It has a great effect.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment embodying the present invention, with Figure 1 being a perspective view of the main part, Figure 2 being a longitudinal sectional view as seen from the weft insertion direction, and Figure 3 being a plan sectional view of the main part. , FIG. 4 is a graph, and FIG. 5 is a perspective view showing a conventional weft detector. Weft detector...18, support pieces...22a, 22b,
Light emitting element...23, light receiving element...24, weft guide passage...S, thickness...l1, distance...l2, l3, l4, warp...T, weft...Y.

Claims (1)

[Claims] 1. In a weft detection device equipped with a reflective light emitting/receiving device for detecting a weft that is flown by a jetting fluid in a weft guide path formed on the front surface of a reed, the warp can be separated and entered into the warp opening. A pair of support pieces are spaced apart in the weft guide path direction and arranged side by side within the weaving width area, and a light emitting element is provided at the tip of one support piece, and a light receiving element is provided at the tip of the other support piece. , these both light emitting and receiving elements are arranged close to the opening side of the weft guide passage, and the optical axes of both light emitting and receiving elements are directed into the weft guide passage in a substantially parallel state, and the starting points of both optical axes are A weft detection device in a jet room in which the interval is set to within 5 mm, and the distance between the intersection position of the wall surface constituting the weft guide passage and the optical axis and the starting point of the optical axis is set to 8 to 13 mm.