JP2636705B2 - Yarn unwinding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn feeding method suitable for use in a dropper device which draws a yarn through a heald, a dropper, a reed or the like at a time by using jet air in a fabric weaving preparation process, and a method thereof. With respect to the device, and more particularly, a heald,
The present invention relates to a yarn feeding method and apparatus for controlling a yarn feeding speed from a blowing type or suction type yarn feeding device for passing a yarn through a dropper or the like.

[0002]

2. Description of the Related Art In a cloth weaving preparation process, there is an operation of passing a thread through a heald, a dropper and a reed. This work involves taking out one by one from a large number of yarns arranged in a straight line in a stretched state, and sequentially passing the yarns through a plurality of heads arranged in series, at least one heald, a dropper, and one reed. In recent years, a technique has been developed which automatically performs a thread drawing operation in this preparation step using an air jet. In general, a method of drawing a thread by jet air is such that a plurality of threading heads or suction nozzles having a threading passage penetrating therethrough and jetting jet air into the threading passage are arranged in series. Then, a heald and a dropper are sandwiched between the threading head or the suction nozzle, and the yarn is caused to fly by jet air from inside the threading passage of the threading head at the upstream end toward the threading passage on the downstream side to the heald and the dropper. Through.

By the way, when the yarn is fed from the tip by jet air in the threading passage of the threading head, if the rear part of the yarn is left free, the yarn is quickly sent as a whole by the air. 7A and 7B, the rear side of the thread is pushed in, and as shown in FIGS. 7A and 7B, the position of the head when passing through a threading passage b formed in a threading head a, for example. In this case, there is a problem that the thread t is clogged at the position of the heald, the dropper h, and the thread cannot be smoothly passed through the heald, the dropper h.

As a countermeasure to solve such a problem, a method for threading a thread disclosed in Japanese Patent Application Laid-Open No. Hei 5-1255641 has been proposed. When it reaches just before the sandwiched heald,
By temporarily stopping the flight of the yarn by pressing the rear portion of the yarn, the flying is started again, thereby preventing the yarn from being caught in a place where the yarn is likely to be caught. However, as described above, the method of temporarily stopping the yarn each time the leading end of the drawn-in yarn approaches the position of the heald or the dropper is good when only passing the yarn through one heald or the dropper, When passing a thread through several healds and droppers at a time, the flight of the thread must be stopped by the number of healds and droppers, and not only the overall threading speed decreases but also the position fluctuates randomly. Therefore, the mechanism becomes extremely complicated and is not suitable for application to a drawing machine.

[0005] By the way, the feed speed of the yarn can be changed by adjusting the blowing amount of the air, but the speed of the yarn sent by the jet air is as high as approximately 200 m / sec to 300 m / sec. Since the range where the threading is performed is about 1 m, the time for the thread to pass through the range is 1/200 second to 1/300 second, and it is impossible to adjust the amount of air blowout within this short time. It is.

[0006]

An object to be solved by the present invention is to control the yarn feeding speed to be lower than the speed of the air flowing in the threading passage of the yarn feeding device by using a feeding arm, so that the front side of the yarn is controlled. The purpose of this is to allow the thread to pass through the threading passage with the part always stretched straight, thereby preventing jamming of the thread.

[0007]

According to one aspect of the present invention, one end of a yarn is positioned near a yarn feeder, and the yarn is moved from the one end to the downstream from the upstream side of a threading passage of the yarn feeder. A feeding arm which swings on a plane which is the same as or substantially parallel to a plane including the axis of the threading passage, and which is provided between the one end and the other end of the yarn. And the feed speed of the portion of the yarn hooked on the payout arm is set to be lower than the speed of the air flowing through the threading passage.

Another aspect of the present invention is a yarn feeding device that positions one end of a yarn in the vicinity of a yarn feeder, and feeds the yarn from the one end by air from an upstream side to a downstream side of a threading passage of the yarn feeder. , A pay-out arm that swings on a plane that is the same as or substantially parallel to the plane including the axis of the threading passage is provided, and the pay-out arm is rotatably provided with a thread roller that guides the thread by hanging the thread. A drive mechanism for driving an arm is connected to the payout arm, and the drive mechanism has a speed at which the speed of the yarn moving away from the yarn roller toward the yarn feeder is lower than the speed of the air flowing through the threading passage. Thus, the feed arm is driven.

[0009]

In the yarn feeding device having the above-described structure, when the yarn whose upper end is cut is manually dragged by the operation of the feeding arm and one end of the yarn is positioned near the yarn feeding device,
Air is flowed into the threading passage of the thread feeder, and the one end of the yarn is drawn into the threading passage. Thereafter, the feeding arm is driven in a direction to feed the thread to the threading passage, and passes the thread from the upstream side to the downstream side of the threading passage. At this time, the feeding arm is driven such that the speed of the yarn separating the yarn roller of the feeding arm toward the yarn feeding device is lower than the speed of the air flowing in the threading passage, so that one end of the yarn always becomes the leading end. It is passed through the threading passage as if pulled. Therefore, the thread is hardly caught and clogged.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a yarn feeding device 10 according to the present embodiment. The feeding device 10 is provided adjacent to the yarn feeding device 1 (the lower side of the yarn feeding device in FIG. 1), and includes a servomotor 11 and a feeding arm 21 fixed to a rotation shaft 12 of the servomotor 11. And The axis of the rotary shaft 12 of the servomotor 11 is disposed and fixed so as to be perpendicular to the plane (in this embodiment, the paper surface of FIG. 1) including the axis of the threading passage 2 of the thread feeder 1. A portion near one end of the delivery arm 21 is fixed to the rotation shaft 12 so as to swing on the plane in accordance with the rotation of the rotation shaft. Therefore, the servo motor 11 constitutes a drive mechanism for the feed-out arm, and can freely control the rotation speed of the rotating shaft 12 to an arbitrary speed.

A mounting member 22 is fixed to the other end of the feeding arm 21, and a thread roller 23 is rotatably mounted to a distal end of the mounting member 22. The thread roller 23 has a groove formed on the outer periphery, and receives the thread in the groove. The extension arm 21 is at position M
And the position N, in accordance with the reciprocating rotation of the rotary shaft 12 of the servo motor 11. When the feeding arm 21 is at the position M, the yarn roller 23 attached to the tip of the attachment member 22 is connected to a line OO connecting the yarn supply position to the yarn feeder 1 and the rear arrangement position of the yarn. It is on the other side of the extension arm.

The feeding device 10 further includes a guide roller 31 rotatably disposed at a fixed position in proximity to the tip of the feeding arm 21 at a position M, and a holding device for holding the rear of the yarn at the line OO. The apparatus includes a device 40, a yarn gripping device 50 and a yarn pulling device provided adjacent to the yarn feeding device 1. The yarn holding device is adapted to hold a number of yarns arranged in a plane including the line OO and perpendicular to the plane of FIG.
A device having a known structure may be used. Therefore, detailed description of the structure and function is omitted.

As shown in FIGS. 2 to 5, the thread gripping device 50 includes a fixed claw 51 having a groove 51a extending in the longitudinal direction and a movable claw 52 housed in the groove.
The movable claw 52 is rotated with respect to the fixed claw by a pin hole 51b of the fixed claw 51 and a pin 53 passed through the pin hole 52b of the movable claw. The fixed claw 51 is further formed with a notch 51c at the end where the groove is formed and a narrow thread receiving groove 51d extending laterally of the notch. The width of the thread receiving groove 51d is determined by the thickness of the thread t to be separated and supplied, so that the thread does not crush flat when the thread enters the groove exactly and is gripped in cooperation with the movable claw. . The fixed claw 51 and the movable claw 52 are separated from each other by a spring 54 received in a hole 51e formed in a rear portion of the fixed claw 51.
The fronts are biased toward each other. Fixed nail 5
In the vicinity of the bottom of the first groove 51a where the thread receiving groove 51d is located, a thread presser tip 55 made of, for example, a ceramic material.
Has been fixed. The thread gripping device 50 includes a movable claw 52
When the front end 52c of the movable claw is moved in the direction of arrow W by a driving projection provided on the yarn pulling device described later, the front of the fixed claw and the front of the movable claw are slightly separated from each other, and
A thread is inserted in d. After the thread enters the thread receiving groove 51d, the movable claw is in a state as shown in FIGS. 2 and 4, and the thread presser tip 5 fixed to the fixed claw.
The yarn 5 and the movable claw 52 grip the yarn movably in the direction of its extension by a force determined by the compression force determined by the spring 54, and apply a predetermined tension to the yarn.

As shown in FIGS. 2 and 3, the yarn pulling member 60 includes a yarn pulling plate 63 fixed to a piston rod 62 of a cylinder 61 and a driving projection member 66 fixed to the yarn pulling plate 63. Have. The yarn pulling plate 63 is used for the yarn gripping device 5.
0, the tip (opposite the one attached to the piston rod) has inclined surfaces 64 and 6
5. The drive protrusion 67 formed by the drive protrusion member 66 extends between the front portion of the fixed claw 51 of the yarn gripping device 50 and the front portion 52c of the movable claw 52, and is used for driving the yarn pulling plate by the cylinder. In addition, the movable claw 52 is rotated. When the leading end of the yarn pulling plate 63 is retracted to the position Q in FIG. 2, the yarn t enters the entrance of the yarn receiving groove 51d of the yarn gripping device, and then the cylinder 61 operates to move the yarn pulling plate 63. When the tip moves to the position P by moving to the side opposite to the arrow W, the thread t entering the thread receiving groove 51d is moved to the bottom of the thread receiving groove by the action of the inclined surface 64.

In the feeding device 10 having the above-described structure, the yarn on the front side is separated by a yarn separating / supplying device (not shown) from among a large number of yarns held in parallel on a plane including the line OO and perpendicular to the plane of FIG. The upper end (not shown) is cut by a cutter (not shown) after being held by the yarn holding device 40. At this time, the extending arm 21 is at the position M
And the roller 2 attached to the delivery arm
Reference numeral 3 is on the left side (as viewed in FIG. 1) of the line OO as shown by a solid line in FIG. 1, and the roller and the thread are on the same plane as the paper of FIG. Under such conditions, the extension arm 2
When 1 is rotated clockwise by the rotary shaft 12 of the servomotor 11, the thread enters the groove formed on the outer periphery of the thread roller 23, and the thread t is twisted. At this time, since the rear part of the yarn is held by the yarn holding device 40, the rear part cannot be turned by the roller, and the cut upper end moves downward. When the feed arm 21 reaches the position N, the operation of the servomotor 11 stops, and the feed arm also stops at that position. At this time, the upper end of the thread t stops while slightly protruding above the thread gripping device 50.

Next, when jet air is blown out from the nozzle device 4 of the yarn feeder 1 toward the threading passage 3 formed in the main body 2, the jetting force or the spraying force is applied to the threading passage 3. By the combined force with the suction force by the jet air blown to the downstream side, the yarn t
The portion facing the entrance side of the threading passage is stopped by bending toward the threading passage. Then slip through the meantime by the upper end of the thread by the operation of the cylinder 61 is spaced apart fixing claws 51 and the movable pawl 52 of the yarn gripping device 50, the upper end t _e as indicated by the broken line in FIG. 1 is at the head Enter the threading passage. Even in this state, when the feeding arm 21 is stopped at the position N, the yarn is not further fed into the threading passage. Next, the servo motor 11 is operated to extend the arm 2.
When 1 starts to rotate in the counterclockwise direction, the yarn is sent toward the downstream side of the threading passage 2 by the action of jet air blown from the nozzle device 3. In this case, the speed of the feeding arm 21 in the counterclockwise direction is controlled by the yarn roller 23.
The speed of the yarn t moving away from the yarn feeder is adjusted to the speed of the air flowing through the threading passage, preferably in a state in which the yarn does not restrict movement such as a payout arm, that is, the jet air is unrestricted. Is determined to be a speed somewhat lower than the speed at which the yarn flies in the passage. That is, the speed at which the yarn t passes through the threading passage without restraint is V, the speed at which the yarn t leaves the roller 23 and moves to the yarn feeder is V ₁ , and the speed of the roller attached to the tip of the feeding arm 21 is When the moving speed of the clockwise direction and V _2, a V> V _1, because it is V ₁ ≒ 2V _2, a V> 2V _2. It said V ₁ was, preferably, for example 60 m / sec
Which is usually in the range of 10 m / sec to 100 m / sec.

When the speed of the feeding arm 21 rotating from the position N toward the position M, that is, rotating in the counterclockwise direction, that is, the peripheral speed of the roller attached to the feeding arm is determined as described above, the yarn feeder 1 the threading end t _e of yarn t traveling passage 2 on the downstream side is in the state as attracted to always tip by the action of air jets. That is, the thread is always passed in a stretched state. For this reason, clogging of the yarn in the middle does not occur. In addition, the structure does not need to be stopped every time the hole is passed through the hole of the heald or the dropper.
In addition, even if the end of the thread momentarily emerges from the threading passage that is open at the side for some reason, the end vibrates slightly, so that a force that returns to the inside of the passage is generated and returns to the predetermined position, Threading can be accomplished.

FIG. 6 shows a yarn feeder 10 'according to another embodiment. This yarn feeding device 10 '
The two attachment members 22a and 22b are attached to the delivery arm 21, and the yarn rollers 23a and 23b are rotatably attached to the tips of the attachment members.
Intermediate roller 3 between yarn feeder 1 and guide roller 31
2 is provided, which is different from the yarn feeding device of the previous embodiment. In addition, the drive device for the feeding arm is configured by connecting a toothed belt wheel 15 attached to the rotating shaft 14 of the feeding arm 21 and a toothed belt wheel 16 on the motor side by a toothed belt 17. This is another embodiment for power up. In this example,
As shown in FIG. 6, the yarn t passes through the yarn roller 23a, the intermediate roller 32, the yarn roller 23b, and the guide roller 31 from the yarn feeder, and is fed between the payout arm and the yarn feeder, the intermediate roller, and the guide roller. Since the thread is doubled, the swing angle of the payout arm can be smaller than that of the previous embodiment if the total payout length of the yarn is the same. The conditions for the speed at which the yarn t moves away from the yarn roller 23a toward the yarn feeder when the feeding arm advances in the counterclockwise direction are substantially the same as those in the above-described embodiment. However, if the yarn between the intermediate roller 32 and the portion that engages with the guide roller 31 via the yarn roller 23b is loosened when the feeding arm 21 rotates counterclockwise, and the tension does not act properly. Then, the intermediate roller may be positively rotated in the direction of the arrow.

[0019]

According to the present invention, not only can the yarn clogging occurring in the course of threading a heald or a dropper be prevented, but also the yarn is fed out once every time the yarn is passed through a hole in the heald or the dropper. Since there is no need to stop, even when threading through a large number of healds and droppers, threading can be performed quickly, and even if the position fluctuates randomly, a feedback mechanism is not required and the structure of the thread payout mechanism is simplified. it can.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a yarn feeding device according to the present invention.

FIG. 2 is a top view of the yarn gripping device and the yarn pulling device.

FIG. 3 is a side view of the yarn gripping device and the yarn pulling device.

FIG. 4 is a horizontal sectional view of the yarn gripping device.

FIG. 5 is an exploded perspective view of a fixed claw and a movable claw of the thread gripping device.

FIG. 6 is a side view of a yarn feeding device according to another embodiment.

FIG. 7 is a diagram illustrating clogging of a thread in the threading head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Thread feeder 2 Threading passage 10, 10 'Thread feeding device 11 Servo motor 21 Feeding arm 40 Thread holding device 50 Thread gripping device 60 Thread pulling device

Claims (2)

(57) [Claims] 1. A method for feeding a yarn, wherein one end of the yarn is positioned near a yarn feeder and the yarn is fed from one end of the yarn from an upstream side to a downstream side of a threading passage of the yarn feeder by air. A payout arm that swings on a plane that is the same as or substantially parallel to the plane including the axis of the passage is provided, and the yarn is hung between the one end and the other end of the yarn. Wherein the feed speed of the portion is smaller than the speed of the air flowing through the threading passage. 2. A yarn feeder for positioning a vicinity of one end of a yarn to a yarn feeder and feeding the yarn from one end of the yarn from an upstream side to a downstream side of a threading passage of the yarn feeder by air. A delivery arm that swings on a plane that is the same as or substantially parallel to the plane including the axis of the passage is provided. The delivery arm is provided with a rotatable thread roller that hangs and guides a thread, and drives the delivery arm. A mechanism connected to the pay-out arm, wherein the drive mechanism is configured to move the pay-out arm such that the speed of the yarn moving away from the yarn roller toward the yarn feeder is lower than the speed of the air flowing through the threading passage. A yarn feeding device for driving a yarn.