JPH1053939A - Weft detector in fluid-jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a detector of a tip of weft in a fluid-jet loom possible of weft inserting at wide positions in warp opening and introducing the tip of weft to a surveying part withdrawn to an opposite side of a reed at a weaving front line without requiring removing of dents of the reed in a part opposing to the surveyor. SOLUTION: This weft detector has a surveying part 1 of a weft surveyor withdrawn to an opposite side of a weaving front line 2 and a weft pushing member 4 relatively movable in the longitudinal direction of a reed 6 is provided at a front face of dents of the reed 5 at a part opposing to a weft surveyor 3. The weft pushing member 4 is provided in freely movable and the weft pushing member 4 relatively transfer to the reed 6 by inertia according to speed variation of the reed 6, then the weft pushing member 4 has a position near the dents of the reed 5 in backward movement of the reed 6, thus the weft pushing member proceeds to the front of the dents of the reed 5 to push the tip of the weft into the surveyor 3 in a reed beating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft leading end detecting device used for detecting that weft insertion has been normally performed in a water jet loom or an air jet loom. The present invention relates to a weft detecting device characterized by the operation of a pushing member that guides the leading end of a weft inserted into a weft detector of a mechanical or photoelectric type.

[0002]

2. Description of the Related Art In this type of weft detecting device, a mechanical, photoelectric, or current-type detector is used as a detector for detecting the presence or absence of a weft. These detectors detect the weft by a beating operation in which the weft comes into contact with the detector or the weft passes through the optical path of the detector.
In recent high-speed looms, mechanical or photoelectric detectors tend to be used frequently, and the detector is fixed to avoid disturbance, and the weft is guided to the detector by beating operation. Many detection structures are employed.

Conventionally, two types of structures, that is, a structure shown in FIG. 8 and a structure shown in FIG. 9 are known as structures for detecting a weft by providing a mechanical or photoelectric detector 3 at a fixed position. .
In the structure shown in FIG. 8, the detecting unit 1 of the detector 3 is provided at the position of the cloth front, and the weft pressed on the front surface 12 of the reed wing 5 is detected by the detecting unit 1. In the case of this structure, in order to avoid interference between the tip of the detector and the reed 5, the reed at the portion facing the detector 3 is removed.

On the other hand, in the structure shown in FIG. 9, the detecting unit 1 of the detector 3 is retracted from the weaving front 2 to the front of the loom (the side opposite to the reed),
At the time of beating, the reed 5 and the tip of the detector 3 do not interfere with each other. In this case, it is not necessary to remove the reed part of the part facing the detector 3, but the weft does not reach the detecting part 1 only by pushing with the reed 5, so that the part of the part facing the detector 3 is not. A fork or plate-shaped weft pushing member 4 is fixed to the front surface of the reed, and the weft pushing member 4 pushes the leading end of the weft to the detection unit 1.

In FIGS. 8 and 9, reference numeral 7 denotes a lead holder, 8 denotes a lead clamper, and a reed 6 has its lower channel 9 sandwiched and fixed between the lead holder 7 and the lead clamper 8. Further, the weft pushing member 4 of FIG. 9 has its base end sandwiched and fixed between the lead holder 7 and the lower channel 9 of the reed. The weft detector 3 is provided with a needle, a swinging cam, and a photoelectric sensor in the detecting portion 1 formed between the upper claw 10 and the lower claw 11 to swing the needle or cam when the weft passes or to detect a photoelectric change. The presence or absence of the weft is detected based on the fluctuation of the light reception amount of the sensor.

[0006]

In the conventional structure shown in FIG. 8, the reed at the portion facing the detector 3 must be removed. Therefore, when the weave width changes, the reed must be reassembled. Further, since the detection unit 1 of the detector 3 is exposed to the jet flow for weft insertion, a malfunction due to disturbance is likely to occur,
In particular, when a photoelectric detector is used in a water jet loom, disturbance occurs due to the flow of water in the detector 1 portion, making it difficult to accurately detect the weft.

On the other hand, in the structure shown in FIG. 9, in order to avoid interference between the detector 3 and the reed dent 5 and disturbance caused by a weft insertion jet to the detector 1, the detector 1 is moved from the weave front 2 to It is necessary to retreat to a certain extent, and generally, it is necessary to provide the weft pushing member 4 at a position 7 to 10 mm before the front surface 12 of the reed dent. Therefore, it is necessary to deviate the flight position to the cloth fell side, and it becomes difficult to insert the weft at a narrow position of the warp opening. Further, when the leading end of the weft dances and enters between the weft pushing member 4 and the reed wing 5, the weft cannot be detected.

An object of the present invention is to provide an apparatus which solves all the above-mentioned problems of the conventional weft detecting apparatus.

[0009]

According to a first aspect of the present invention, there is provided a weft detecting device for a fluid jet loom, wherein a detecting portion of a weft detecting device is retracted to a side opposite to a reed of a weave front.
A weft pushing member 4 which is relatively movable in the front-rear direction of the reed is provided on a front surface of the reed wing opposite to the weft detector 3.

According to a second aspect of the present invention, in the weft detecting device for a fluid jet loom according to the first aspect, the weft pushing member 4 is provided on the front surface of the reed wing 5 so as to freely move in the front-rear direction of the reed 6. In addition, the weft pushing member 4 moves relative to the reed 6 due to the inertia accompanying the speed change of the reed.

[0011]

The reed reciprocating forward and backward moves forward while accelerating from the position of the retreating end, reaches the advancing end while decelerating, performs beating, then retreats while accelerating, and reaches the retreating end while decelerating. When the deceleration section at the time of retreat and the acceleration section at the time of forward movement, that is, the reed is at the retreat position, an inertial force toward the anti-weave front side acts on the reed and members moving with the reed. Therefore, the weft pushing member 4 provided on the front surface of the reed dent 5 so as to be relatively movable in the front-rear direction moves toward the reed dent 5 by inertia force, and becomes a position close to the front surface of the reed dent 5. Since the weft insertion is performed when the reed is retreating, the weft pushing member 4 is close to the front surface of the reed wing 5 at the time of weft insertion. In addition, the space for weft insertion is greatly opened, and the weft pushing member 4 does not disturb the weft insertion jet.

On the other hand, when the reed moves forward, that is, in the deceleration section when moving forward and the acceleration section when moving backward, inertia force acts on the reed and the members that move with it. Therefore, the weft pushing member 4 movably provided in the front-rear direction moves away from the front surface of the reed dent 5 at the timing immediately before the beating, and the weft provided at a position on the anti-reed side with respect to the weave front 2. The leading end of the weft is pushed into the detection unit 1 of the detector 3. Next, when the reed starts retreating and enters a deceleration section of the retreating operation, an inertial force acts on the weft pushing member 4 in the rearward direction (the reed side) to start relative movement toward the reed side 5. At this timing, the next weft insertion is started, and when the leading end of the weft reaches the weft detection position, the weft pressing member 4
It is a position close to the front of.

As described above, the weft pushing member 4 of the present invention is provided.
Performs an appropriate motion by the inertia generated by the reciprocating motion of the reed without any driving means. In general, it is unnecessary, but if necessary, it is possible to adjust the operation timing of the weft pushing member 4 and increase the reliability of the operation by providing a spring 13, a magnet, and an interference member 14. It is. The weft pushing member 4 is provided on the front surface of the reed wing 5 so as to be movable back and forth. As a concrete structure, a structure mounted swingably around the horizontal shaft 15 and a structure mounted swingably by bending of a leaf spring are the simplest, but the structure is supported by guide pins and links and moves in parallel. It is not impossible to provide such a structure.

Practically, the weft pushing member 4 is made of a metal material, and is provided with a cushioning material 16 and a stopper in order to avoid a direct collision with the reed 5. Also, the weft pushing member 4
Is generally required. If the weft pushing member 4 is supported by a spring plate or the like and resonance can be avoided well, a structure without such a stopper is also possible. The weft pushing member 4 needs to be moved in the left-right direction according to the weaving width.
The weft pushing member 4 having the conventional structure shown in FIG. 9 is the same, and various structures can be adopted.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS.
The weft pushing member 4 is made of a metal plate whose base end is bent in a V shape, and has an opening 18 for avoiding interference with the leading end of the weft detector 3. The base end of the weft pushing member 4 is fixed to a bearing member 19 serving also as a stopper 17, and the bearing member 19 is supported by a shaft bracket 21 by a horizontal fulcrum pin 20. The shaft bracket 21 is fixed to a position adjusting plate 23 with screws 22, and the position adjusting plate 23 is fixed to the lead holder 7 by a bolt nut 24 to which the lead clamper 8 is fastened. A portion of the position adjustment plate 23 to which the shaft bracket 21 is fixed has a horizontally elongated hole, and a nut member slidable along the elongated hole 25 is provided on the back surface side (the lead holder 7 side). By fastening the screw 22 to the nut member, the shaft bracket 21 is
Can be fixed at any position along the line. Further, a bolt insertion hole 26 for fixing the position adjustment plate 23 to the lead holder 7 is also a horizontally elongated hole, so that the position where the position adjustment plate 23 is fixed to the lead holder 7 in the left-right direction can be adjusted. It is possible. The reason for providing two positions for adjusting the position in the left-right direction is to increase the adjustment width and to make the position adjustment work easier.

An O-ring 27 is attached to the top of the weft pushing member 4 in a headband shape. When the weft pushing member 4 moves toward the reed wing 5, the O-ring 27 is moved to the front of the reed wing 5. So that the movement of the weft pushing member 4 is stopped so that the metal weft pushing member 4 stops at a position close to the front surface of the reed wing 5 without directly colliding with the reed wing 5. Has become. As shown in FIG. 3, the forward moving end of the weft pushing member 4 is regulated by the stopper 17 formed on the bearing member 19 abutting the position adjusting plate 23. In order to reduce the radial load on the fulcrum pin 20, it is preferable to provide the stopper 17 at a position away from the fulcrum pin 20.

FIGS. 2 and 3 show the operation of the first embodiment in which the weft pushing member 4 is provided so as to be freely movable. FIG. 2 shows the weft inserted into the weft 28 while the reed 6 is moving forward. FIG. 3 is a view showing the moment when the weft pushing member 4 has caught, and FIG. 3 shows that when the beating is performed, the weft pushing member 4 moves relatively to the front of the reed wing 5, and the leading end 28A of the weft. To the detector 1 of the weft detector 3
FIG. 5 is a diagram showing a state where the device is inserted into the device. In these figures, 29 is the warp line, and 30 and 31 are the warp positions at the maximum opening.

On the other hand, FIGS. 6 and 7 show a coil spring 32 for applying a biasing force in a direction in which the weft pushing member 4 is attached to the front surface of the reed dent 5, and a bearing for when the reed advances to a position immediately before reeding. This shows a structure provided with an engaging member 33 which engages with the material 19 and relatively swings the weft pushing member 4 forward by the reed movement. In the case of this structure, the weft pushing member 4
Is kept close to the front surface of the reed wing 5 for a longer period during the reciprocating movement of the reed 6 by the urging force of the coil spring 32, and moves forward only for a shorter period immediately before and immediately after the beating. Then, an operation of pushing the leading end of the weft into the detection unit of the weft detector is performed.

Instead of providing the engaging member 33 which directly contacts the bearing member 19 or the like, the same poles of the magnets are provided on the bearing member 19 and the fixing member 34 so as to oppose each other. It is also possible to make the weft pushing member 4 perform an aggressive forward movement without making contact.

In FIG. 1, reference numeral 35 denotes an ear thread cutter, 36 denotes a catch cord, and 37 denotes a catch cord twisting device, which have a conventional structure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment mounted on a loom;

FIG. 2 is a side view of the first embodiment when the reed is retracted.

FIG. 3 is a side view of the first embodiment when the reed advances.

FIG. 4 is a perspective view showing a cushioning material at the tip of a weft pushing member.

FIG. 5 is a side view of the same.

FIG. 6 is a side view of a main part of the second embodiment when the reed is retracted.

FIG. 7 is a side view of the main part of the second embodiment when the reed advances.

FIG. 8 is a side view of the first conventional example.

FIG. 9 is a side view of the second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detecting part 2 Orifront 3 Weft detector 4 Weft pushing member 5 Reed wing 6 Reed

Claims (2)

[Claims] In a weft detection device provided with a detection section (1) of a weft detector retracted to the anti-reed side of a weaving front (2), a front face of a reed wing facing a part of the weft detector (3) is provided. A weft pushing member (4) which is relatively movable in the front-rear direction of the reed. A weft pushing member (4) is provided with a reed on the front surface of a reed wing (5).
(6), wherein the weft pushing member (4) moves relative to the reed (6) by inertia accompanying a change in speed of the reed. 2. The weft detection device for a fluid jet loom according to claim 1.