JPH0770878A - Yarn gripping device and fluid jetting loom - Google Patents

Abstract

PURPOSE:To provide a small-sized and lightweight yarn gripping device.and to supply a fluid jetting loom for preventing unevenness of weft tension, improving quality of woven fabric, having small power consumption, by installing the yarn gripping device at the reverse side of a nozzle end of a reed. CONSTITUTION:One magnetic pole of a permanent magnet 19 is positioned at a gap 14 of an electromagnet 13 equipped with a circular or rectangular looped magnetic core 15 having the gap, AC current is sent to the electromagnet to reciprocate the permanent magnet 19 and a finger arm 9 of a yarn gripping device. The permanent magnet 19 is fixed to between a support axis 12 of the finger arm 8 and a yarn gripping end 9 and the reciprocating direction of the permanent magnet 19 in the gap 14 is the direction same as the opening and closing direction of the finger arm. The electromagnet 13 of the yarn gripping device is arranged at the back of a reed 1, the gripping end 9 of the finger arm 8 is made to face weft flying line in front of the reed 1 and the tip of weft is gripped at the maximum elongation of the weft during weft inserting to beat the weft by the reed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet-driven yarn gripping device and a fluid jet loom equipped with a yarn gripping device at the end opposite to the nozzle on the weft flying line on the front face of the lure.

[0002]

2. Description of the Related Art A weft yarn inserted into the front of a lure by a water jet or an air jet is driven into a cloth fell at a timing after the jet flow for weft flight disappears. When the weft yarn is in the jet flow, the weft yarn is tensioned by the transport force acting from the jet flow,
Further, at the end of weft insertion, tension due to inertia of the flying weft acts, and the weft reaches maximum elongation. When the flight is stopped in this state and the jet flow is further extinguished, the tip end of the weft is pulled back by the elastic restoring force of the weft. As a result, the tension of the weft is uneven in the longitudinal direction, and the weft is driven in a state in which the deflection (dancing) of the tip of the weft is not eliminated.

Non-uniform weft tension and runout of the weft tip at the time of beating deteriorates the quality of the woven fabric to be woven and, in extreme cases, causes weaving defects. By selecting the timing to be changed, weft flight speed and jet flow extinction timing are set. However, it was impossible to drive all kinds of wefts having different stretchability and restoring force with uniform tension in the structure where the wefts are beaten while the weft ends are in a free state.

Therefore, in the water jet loom, a plate for sticking the tip of the weft with water tension is provided at the end of the weft flying line on the front side of the weft on the side opposite to the nozzle, together with an electric feeler for detecting the end of the weft. In addition to preventing this, the free return of the tip of the weft is restrained to improve the uniformity of the weft tension during beating.

Further, in the air jet loom, as shown in FIG. 4, the air jet direction of the auxiliary nozzle 21 at the end opposite to the nozzle is set to the direction orthogonal to the lure surface, and the flank wing of the portion 22 through which the air flow passes. By widening the space and bending the flying weft tip so as to be bent to the back side of the beating by the air flow of the auxiliary nozzle 21 at this end, the weft tension at the time of beating is made uniform and the weft end A structure that prevents runout is adopted.

Further, as a structure for more surely restraining the weft end inserted into the weft, a structure in which the weft end is sucked in by suction air as shown in FIG. 5 or a front side of the weed 1 (the cloth fell side) as shown in FIG. Is provided with a vertical fixing plate 24 projecting to the tail side, and when the tail moves to the cloth fell side, this fixing plate 24 is inserted between the tails and the weft tip is placed between the tail blade and the tail plate 24. A structure for restraining the front end of the weft yarn by bending it in a U-shape by means of, or a yarn gripping device is provided at a fixed position on the side opposite to the nozzle on the weft flight line, and the front end of the weft yarn is fixed immediately after weft insertion. A structure for gripping with is proposed.

[0007]

There is a strong demand for a fluid jet loom to not only be able to weave woven fabrics of good quality and without defects, but also to reduce power consumption during operation and yarn loss. There is. In addition, it is important for improving the operating rate of the loom that it is possible to easily perform various adjustment operations at the time of thread change and that the downtime of the loom during thread change is short. When viewing the above-mentioned conventional structure from this point of view, for example, in the case where the weft is attached to the plate by water tension, the weft end is not sufficiently restrained, and the auxiliary nozzle or the negative pressure for directing the jet flow With a structure in which the tip of the weft is constrained with air, it is necessary to continuously inject and suck air from the end of the flight of the weft until it is driven in, so the power during operation is extremely high. There is a problem of getting bigger.

[0008] Further, in other conventional structures except for the structure in which the tip of the weft is gripped by the thread gripping device, an extra weft length is required for restraining the yarn end, and there is a problem that the loss of the weft increases. Further, in the conventional structure in which the tip of the weft is grasped by the yarn grasping device provided at the fixed position, the weft is bent and pulled between the grasping portion of the yarn tip and the adjacent feather at the time of beating. In order to prevent the occurrence of shrinkage, which is a weaving defect, due to the weaving defect, it is necessary to release the thread gripping device at the timing of beating, but it is very difficult to adjust the release timing. There is a problem that the quality of the woven fabric is deteriorated in all cases.

Since this type of yarn gripping device requires fine adjustment of its operation timing and is often added to the loom as an optional device, an electromagnet driven finger is usually used. However, since a certain amount of gripping force is required and the opening / closing cycle is very fast, the yarn gripping force and the electromagnet driving force act as a large reaction force on the fulcrum shaft of the finger, etc. It had the drawback of being violent, having a short life, and having a major problem of practicality.

Therefore, the present invention makes it possible to obtain a higher quality woven fabric by making the tension of the weft yarn uniform at the time of driving without increasing the driving power and the unevenness of the weft yarn, and further reduce the consumption amount of the weft yarn. It is an object of the present invention to obtain a fluid jet loom that can be used, and to obtain a highly durable electromagnet-driven yarn gripping device that can be used as the yarn gripping device of the above-mentioned loom.

[0011]

In the yarn gripping device according to the present invention, a permanent magnet 19 is provided in the gap of an electromagnet 13 having a magnetic core 15 in the shape of a circular loop or a rectangular loop having a gap 14 at one position of the loop. One of the magnetic poles is movably positioned, and the finger arm 8 is reciprocally driven by the reciprocating motion of the permanent magnet 19 in the gap 14 when an alternating current is applied to the electromagnet. . The permanent magnet 19 is fixed between the fulcrum shaft 12 of the swing finger arm 8 and the thread gripping end 9, and the reciprocating direction of the permanent magnet 19 in the gap 14 is opened and closed by the gripping end 9 of the swing finger arm. By making the direction substantially the same as the moving direction, the load on the fulcrum shaft 12 of the swing finger arm 8 can be reduced.

In the fluid jet loom according to the present invention, the swing finger arm 8 having the fulcrum shaft 12 on the back side of the reed is held at the position on the front side of the reed 1 on the side opposite to the nozzle on the weft flight line L. The yarn gripping device 2 is provided so that the end 9 is exposed,
The oscillating finger arm of this thread gripping device is driven by an electromagnet 13 arranged on the back side of the reel 1. The above thread gripping device can be adopted as the thread gripping device of this fluid jet loom.

[0013]

The yarn gripping device 2 provided on the reel 1 of the fluid jet loom of the present invention grips the tip of the weft inserted at the maximum extension timing of the weft just after weft insertion, and moves to the cloth fell side together with the back. Hold the tip of the weft until the completion of weft driving. Normally, the maximum extension timing of the weft yarn is adjusted so that the weft yarn driven in front of the lure and the front face of the lure moving to the cloth fell side come into contact with each other, so the yarn gripping device 2 Holds the tip of the weft at this timing. Since it is sufficient for the thread gripping device 2 to project the gripping end 9 slightly to the front of the bob, the thread gripping device 2 can be made small and lightweight, and by using the thread gripping device having the structure of the present invention, it can be put to practical use. The electromagnet 13 can be miniaturized by sufficient durability and doubling of electromagnetic force.

Further, the yarn gripping device 2 provided on the reed 1 grasps the front end of the weft at the timing when the weft comes into contact with the front surface of the reed 1, and then moves together with the reed 1 to drive the weft and release the front end of the rear yarn. Therefore, the tension of the weft yarn can be made more uniform, the quality of the woven fabric can be improved, and the opening / closing timing of the yarn gripping device 2 can be easily adjusted. Further, since the yarn gripping device 2 provided on the hook grips the tip of the weft at the timing when the weft is stretched to the maximum, it is struck and struck in the weaving cloth with tension remaining in the weft, that is, in the stretched state. After that, the warp yarns woven into this prevent the weft yarns from shrinking, and the uniform tension of the weft yarns causes the warp yarns to be tightly woven over the entire width of the weaving yarn, and eventually the weft yarns are woven in the stretched state. With the shorter weft, the required weft width can be obtained, and the weft consumption can be reduced.

Further, in the yarn gripping device of the present invention, the opposite ends 17, 18 of the loop-shaped magnetic core 15 in which one pole of the permanent magnet 19 located in the gap 14 of the magnetic core serves as magnetic poles in mutually opposite directions.
Since the attractive force and the repulsive force are received in the same direction from the electromagnet 1,
The magnetic force of 3 doubles and acts on the permanent magnet 19, and by reversing the current flowing through the electromagnet 13, the permanent magnet 19 can be reciprocated. That is, in the driving structure of the yarn gripping device of the present invention, the driving structure by the electromagnet of the conventional yarn gripping device, that is, the structure of opening and closing the finger by the attraction force or repulsive force of the electromagnet and the restoring force of the spring, and the attraction force of the permanent magnet. It is possible to reduce the size and current consumption of the electromagnet for obtaining the necessary gripping force, as compared with the structure in which the fingers are opened and closed by the repulsive force of the electromagnet and the repulsive force in the opposite direction. Further, the permanent magnet 19 in the gap 14 having the above structure acts on this permanent magnet because one pole located in the gap 14 is brought into the gap 14 by the electromagnetic force generated at both ends of the gap 14. The reaction force acting on the fulcrum shaft 12 of the swing finger arm 8 can be made extremely small by making the direction of the electromagnetic force and the opening / closing direction of the gripping end of the swing finger arm substantially the same. As a result, the wear of the fulcrum shaft 12 portion is greatly reduced, and the durability for practical use is obtained.

The operation of the thread gripping device of the present invention as described above is not limited to the case where the thread gripping device is used as the thread gripping device provided in the loom of the loom, and the thread gripping device provided in front of the weft inserting nozzle of the loom. Alternatively, the same effect is exhibited when used as a yarn gripping device provided in the weft yarn storage device.

[0017]

1 to 3 show an essential part of a fluid jet loom according to the present invention and an embodiment of a yarn gripping device according to the present invention used therein. As shown in FIGS. 1 and 3, a yarn gripping device 2 is fixedly provided on a sley 3 that holds the lure 1 adjacent to the side of the weft insertion nozzle of the loom 1 of the loom. The thread gripping device 2 includes a frame plate 4 having a front surface that is flush with the front surface of the fish 1 (the front edge of the feather).
The lower end of is fixed to the sley 3. A rectangular opening 5 is provided in the frame plate 4, and when the gripping end 7 of the fixed finger arm 6 and the gripping end 9 of the swing finger arm 8 are opened and closed from this opening 5 when the swing finger arm 8 is opened. Further, the flight line L of the weft is positioned between the two gripping ends 7 and 9 so as to project to the front surface of the frame plate 4. Both gripping ends 7 and 9 are formed in a plate shape having a certain width in the direction of the flight line L so that the weft yarn tip can be reliably gripped even if there is some variation in the tip position of the weft yarn. , When the sley 3 moves forward (moves to the cloth fell side),
The lower one 7 is bent downwards and the upper one 9 is bent upwards so that the weft thread is guided between the two gripping ends 7, 9. The fixed finger arm 6 is fixedly provided to the frame plate 4, and the swing finger arm 8 has its base end parallel to the flight line L on a bracket 11 extending rearward from the frame plate 4 at a rear side portion of the bob 1. It is pivotally supported by a fulcrum shaft 12 that is planted in the vertical direction and is swingable in the vertical direction.

An electromagnet 13 for moving the swing finger arm 8 up and down is provided at a position between the fulcrum shaft 12 and the frame plate 4.
Is provided. As shown in FIG. 2, the electromagnet 13 has a circular loop-shaped magnetic core (iron core) 15 having a gap 14 at one position of the loop, and a coil 16 is turned around the magnetic core 15 in one direction. ing. Therefore, when a direct current is applied to the coil 16, one of the magnetic poles 17 and 18 facing each other across the gap 14 becomes an N pole and the other becomes an S pole. In the gap 14 of the electromagnet, a small strip-shaped permanent magnet 19 has one magnetic pole (N pole or S pole) located in the gap 14, and the other magnetic pole portion is an intermediate portion of the swing finger arm 8 ( It is fixedly provided on the fulcrum shaft 12 and the gripping end 9. That is, only one of the magnetic poles is in the gap 14, that is, the electromagnet 13
It is located in the area of action of the magnetic force of. Therefore, the permanent magnet 1
When a direct current is applied to the electromagnet 13, 9 is attracted to one of the magnetic poles of the electromagnet that is the opposite magnetic pole, and receives a repulsive force from the opposite magnetic pole that is the same magnetic pole, and the opposite magnetic pole side is caused by both of these forces. Move to. Then, by making the direction of the direct current flowing through the electromagnet 13 opposite, the gap 1
The attracting force and the repulsive force in the opposite directions act on the magnetic poles of the permanent magnets located inside 4 to move the permanent magnets 19 to the opposite side.
The gap 1 of the permanent magnet 19 generated by reversing the direction of the direct current flowing through the coil 16 of the electromagnet 13
The reciprocating motion within 4 is transmitted to the intermediate portion of the swing finger arm 8, and the gripping end 9 swings around the fulcrum shaft 12,
The gripping ends 7 and 9 projecting forward of the fish 1 are opened and closed. In the illustrated embodiment, the electromagnetic force of the electromagnet 13 acts vertically on the intermediate portion of the oscillating finger arm 8, and the grasping end 9 of the oscillating finger arm 8 when the weft tip is grasped. First, a reaction force is applied upward from the gripping end 7 of the fixed finger. At this time, since the electromagnet facing downward is acting on the intermediate portion of the swing finger arm 8, only the force corresponding to the difference between the two acts on the fulcrum shaft 12 to bring the electromagnet 13 close to the gripping end 9. The reaction force acting on the fulcrum shaft 12 can be reduced by providing the above. The reduction of the reaction force applied to the fulcrum shaft 12 of the swing finger arm 8 is such that the electromagnetic force of the electromagnet 13 is at an intermediate position between the fulcrum shaft 12 of the swing finger arm 8 and the grip end 9, and the grip end 9 is moved. It can be realized by making it act in a direction substantially parallel to the direction of the gripping force.

Next, the operation of the loom in which the yarn gripping device 2 having the above-described structure is provided at the end of the reed 1 on the side opposite to the nozzle will be described. By applying a weak direct current in one direction to the electromagnet 13 of the thread gripping device 2,
With both gripping ends 7 and 9 open, the reed 1 is retracted,
A weft is inserted along a flight line L in front of the reel 1 with a nozzle (not shown). Then, when the hook 1 moves forward and the weft stops flying at the timing when it comes into contact with the weft-inserted weft, at the same time the jet flow (water jet or air jet from the auxiliary nozzle at the final stage) disappears. Adjust the insertion timing. If the weft insertion timing is adjusted in this way, the weft thread comes into contact with the front surface of the reel 1 in the state of maximum extension, and at that time, the tip of the weft thread is guided between the two gripping ends 7 and 9 of the thread gripping device. At the same timing, the direction of the current flowing through the electromagnet 13 is reversed, and the gripping ends 7 and 9 of the yarn gripping device are closed to grip the tip of the weft. That is, the front end of the weft yarn is gripped in the maximum stretched state, and the weft yarn is driven into the cloth fell by the back 1 while keeping the stretched state.

The yarn gripping device 2 opens at the timing after the hook 1 has been driven into the cloth fell to release the front end of the weft yarn. At this time, the warp group has already started the opening operation in the reverse direction, Will be woven between the warp groups in the stretched state. Therefore, the warp yarns are tightened by the tension of the weft yarns, and a tight and uniform woven fabric can be obtained.

[0021]

According to the loom of the present invention described above,
It is possible to weave a high quality woven fabric with uniform weft tension and no dandruff or looseness, and because it does not require pneumatic power to hold the yarn ends, it does not increase operating power and It is possible to reduce the amount of weft consumption.

Further, the yarn gripping device of the present invention has the effects that the electromagnetic type yarn gripping device having a strong gripping force can be reduced in size and weight and the durability thereof can be dramatically improved.

[Brief description of drawings]

FIG. 1 is a partial sectional side view of a thread gripping device of the present invention mounted on a sley.

FIG. 2 is a schematic rear view showing a drive mechanism of the thread gripping device.

FIG. 3 is a perspective view showing a hook with a thread gripping device attached.

FIG. 4 is a schematic view showing a first example of a conventional weft tip holding device.

FIG. 5 is a schematic diagram showing a second example of a conventional weft tip holding device.

FIG. 6 is a schematic diagram showing a third example of a conventional weft tip holding device.

[Explanation of symbols]

 1 Oscillator 2 Thread gripping device 6 Fixed finger arm 8 Swing finger arm 9 Gripping end 12 Support shaft 13 Electromagnet 14 Gap 15 Magnetic core 19 Permanent magnet

Claims (4)

[Claims] 1. An electromagnet (1) comprising a circular loop-shaped or rectangular loop-shaped magnetic core (15) having a gap (14) in a part of the loop.
One of the magnetic poles of the permanent magnet (19) is movably positioned in the gap of 3), and by the reciprocating motion of the permanent magnet (19) in the gap (14) when an alternating current is applied to the electromagnet. A thread gripping device, characterized in that the finger arm (8) is reciprocally driven. 2. The permanent magnet (19) according to claim 1 is fixed between the fulcrum shaft (12) of the swing finger arm (8) and the thread gripping end (9), and the gap (1) according to claim 1 Permanent magnets in (14) (19)
2. The yarn gripping device according to claim 1, wherein the reciprocating direction of said is substantially the same as the opening and closing direction of the gripping end (9) of the swing finger arm. 3. A swing finger arm (8) having a fulcrum shaft (12) on the back side of the bob (1) at a position opposite to the nozzle end on the weft flight line (L) on the front side of the bob (1). A thread gripping device (2) is provided with the gripping end (9) exposed, and the swing finger arm of this thread gripping device is driven by an electromagnet (13) arranged on the back side of the reel (1). A fluid jet loom, which is characterized in that 4. The fluid jet loom according to claim 3, wherein the yarn gripping device of claim 3 is the yarn gripping device of claim 1 or 2.