JPH0680221B2 - Tack-in selvedge device of fragment loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tuck-in selvage device for forming an ear tissue by folding back the end of a beating yarn beaten in a fragment loom and inserting it into the next warp yarn opening. .

<Prior Art> Conventionally, as a tuck-in selvage device of this type, there is, for example, a device described in JP-A-57-193557.

This is a tuck-in needle that is swingably supported so as to catch the beated end of the weft and fold it back to insert it into the next warp shed, and mechanically move the weft end until it is caught by this needle. It is composed of a yarn holder (yarn grasper) for grasping, and these are operated at a predetermined timing.

<Problems to be Solved by the Invention> However, in such a conventional tuck-in selvedge device, a mechanical yarn gripper is used to hold the weft end until it is caught by the tuck-in needle. Therefore, for example, the weft may sag when grasped, or the grasp may become loose and the weft may become slack, which causes uncertain capture of the weft by the tuck-in needle, and especially on the weft inserting side. When forming the selvage, the weft ends are free to be cut by a cutter for the next weft insertion, but it is very difficult to match the timing of cutting with this cutter and the weft gripping. It also contributed to the occurrence of sagging.

In view of such conventional problems, the present invention does not cause the weft to sag, and does not require timing adjustment.
It is an object of the present invention to provide a tuck-in selvage assembly device that can surely capture a weft thread by a tuck-in needle and can form an ear tissue satisfactorily.

<Means for Solving Problems> In order to solve the above problems, the present invention provides a yarn holder that holds a weft yarn end until it is caught by a tuck-in needle, an air ejection nozzle, and this air ejection nozzle. And a yarn holding portion having a through hole through which the air flow from the cloth flows, and is arranged almost on the warp line behind the cloth fell, and the pressure is changed in the middle of the air supply passage to the air jet nozzle. A device is provided.

<Operation> In the above configuration, as soon as the end of the weft yarn is cut by the cutter and becomes free, the air nozzle type yarn retainer pulls and holds the yarn in a tensioned state, and the yarn is always tensioned by the air flow. Since the weft yarn does not sag, the weft yarn can be reliably captured by the tuck-in needle. And, in particular, since the yarn holder is composed of the air jet nozzle and the yarn holder having the through hole through which the air flow from the air jet nozzle passes,
That is, since the weft yarn end is pressed against the yarn holding portion by the jet airflow and pulled and held, compared to the case where the suction airflow is used,
A large traction force can be obtained with a small flow rate and the holding is stable. Further, since the pressure changing device is provided in the middle of the supply path of the pressure air to the air jet nozzle, that is, the amount of air jetted from the air jet nozzle by the pressure changing device, and hence the traction force of the weft end portion Since it can be changed according to the above, the holding can be further stabilized.

<Embodiment> An embodiment of a tuck-in ear assembly according to the present invention will be described below with reference to FIGS. 1 to 7. The figure shows the tack-in selvage device on the weft insertion side.

With reference to FIGS. 1 to 3, 1 is a warp yarn, 2 is a reed, 3 is a cloth cloth, 4 is a woven cloth, and 5 is an expansion rod for drawing out.

Reference numeral 6 denotes a tuck-in needle, which is fixed via a bracket 9 to an end portion of an operating rod 8 which projects from the gear box 7 and reciprocates in the axial direction while reciprocating.
It is curved as a whole and has a hook portion 6a at its tip, and catches the end of the beaten weft yarn, turns it back and inserts it into the next warp yarn opening.

10 is a scissor-type cutter, which is composed of a fixed blade 11 and a movable blade 12, and cuts the end portion of the beating weft.

Reference numeral 13 is an air nozzle type yarn retainer that pulls and holds the end of the weft yarn that has been cut until it is caught by the tuck-in needle 6, and is attached to the gear box 7 via a bracket 14 and a pressure air supply pipe 15 It has an L-shaped hollow member 16 to which pressurized air is supplied from and a pipe 17 protruding downward from the tip of this hollow member 16.
The notch 17a formed on the rear peripheral surface of the
And is disposed on the warp line behind the cloth fell 3. As shown in FIG. 4, a tapered air ejection nozzle 18 is provided downward in the pipe 17 so as to be located above the notch 17a and connected to the inside of the hollow member 16. As a result, as shown in FIG. 4, the yarn holding portion 17c having the through hole 17b, which is opposed to the air jet nozzle 18 and through which the air flow from the air jet nozzle 18 passes, is formed from the notch 17a of the pipe 17. Formed by the lower part.

Reference numeral 19 is a weft guide, which is arranged side by side with the cutter 10 on the side opposite to the weave, has an inclined guide portion 19a and a locking recess 19b, and the weft is locked in the locking recess 19b during the beating process. It is locked and positioned in the opening of the cutter 10 and in the notch 17a which is the air flow operating area of the air nozzle type yarn holder 13.

As shown in FIG. 5, 20 is a guide lever, which is rotatably supported by a fixed shaft 21 protruding from the gear box 7, the tip of which is a selvage and an air nozzle type yarn holder. When the weft yarn is transferred from the yarn holder 13 to the tuck-in needle 6 with the yarn holder 13, the weft yarn is swung so as to press the weft yarn toward the tuck-in needle 6.

Next, the drive mechanism of the tuck-in needle 6 is shown in FIG.
This will be described with reference to FIGS. 2 and 6.

A toothed pulley 26 mounted on a drive shaft 25 that rotates in synchronization with the rotation of the loom main shaft is rotatably supported by a shaft 28 arranged outside the gear box 7 via a toothed belt 27 to form a toothed pulley 29. The input shaft 33, which is rotatably supported by the bearing 32 on the gear box 7 via the gear 31, is rotated by the gear 30 integrated with the toothed pulley 29.

In the gear box 7, two sets of groove cams are fixed to the input shaft 33.
There are 34 and 35.

A cam follower 37 attached to one end of a slider 36 is positioned in the groove 34a of one groove cam 34, and the other end of the slider 36 is guided by an elongated hole 38a of a guide plate 38, and the slider is rotated by the rotation of the groove cam 34. The 36 is reciprocated. Then, the operating rod 8 of the tuck-in needle 6 is rotatably and slidably inserted in the middle of the slider 36, and stoppers 39 and 40 are fixed in front of and behind the penetrating portion of the operating rod 8 to slide the slider 36. Only the reciprocating movement of the slider 36 causes the operating rod 8 to reciprocate in the axial direction.

A cam follower 43 attached to one end of an L-shaped lever 42 rotatably supported by a fixed shaft 41 is positioned in the groove 35a of the other groove cam 35, and the lever 42 is swung by the rotation of the groove cam 35. I am allowed to do it. Then, one end of a rod 45 whose length is adjustable is connected to the other end of the lever 42 via a ball joint 44, and the other end of the rod 45 is connected to a ball joint.
It is connected via a pin 46 to a pin 48 fixed to a crank 47, and the swing of the lever 42 causes the crank 47 to make a reciprocating angular motion. The crank 47 has a square hole 47a at the center of rotation, and the square hole 47a is a square shaft portion 49a of a connecting rod 49 fixedly connected to the end of the actuating rod 8 of the tuck-in needle 6.
It is non-rotatably and axially slidably fitted so that the reciprocal angular movement of the crank 47 causes the actuating rod 8 to reciprocate angularly via the connecting rod 49.

Next, the drive mechanism for the cutter 10 and the guide lever 20 will be described with reference to FIGS. 1, 2, and 5.

The gear 50 is fixed to the input shaft 33 in the gear box 7, and the output shaft 53 rotatably supported by the bearing 52 via the gear 51 is driven by the gear 50 in synchronization with the rotation of the loom main shaft. is there. The end of the output shaft 53 is projected outside the gear box 7, and two cams 54 and 55 are fixed thereto.

One cam 54 has a fixed shaft protruding from the gear box 7.
A cam follower 59 attached to one end of a cutter lever 58 rotatably supported by 56 and biased by a spring 57 is brought into contact with the cutter lever 58, and the rotation of the cam 54 causes the cutter lever 58 to swing. And the cutter lever 58
The shaft 60 is fixed to the other end of the cutter, and the movable blade 12 of the cutter 10 is fixed to the mounting portion 61 at the end of the shaft 60.

A cam follower 63 attached to the guide lever 20 rotatably supported by the fixed shaft 21 and biased by a spring 62 is brought into contact with the other cam 55, and the guide lever 20 is swung by the rotation of the cam 55. I am allowed to do it.

Next, the operation will be described.

When the weft is beaten by the forward movement of the reed 2 after the weft has been inserted, the weft moves along the inclined guide portion 19a at the portion of the weft guide 19 and finally enters the locking recess 19b and is locked. Even if 2 moves backward, it is held in this position. At this position, the weft thread stretched between the weft selvage and the weft thread guide 19 is located in the opening of the cutter 10 and the air nozzle type thread holder 13
It is located in the notch 17a of the pipe 17 of FIG.
State). Incidentally, the reed wing is removed from the portion of the reed 2 facing the cutter 10, the air nozzle type yarn holder 13, the weft guide 19 and the guide lever 20.

Here, assuming that the beating timing is 0 ° with respect to the rotation angle of the loom main shaft, the cam 54 causes the cutter lever to move at about 5 °.
The movable blade 12 of the cutter 10 is driven via the 58 and the fixed blade 11
The weft is cut in cooperation with.

At this time, since the weft yarn between the weaving selvage and the cutter 10 is already located in the notch 17a which is the air flow action area of the air nozzle type yarn holder 13, when the weft yarn is cut by the cutter 10, The cut weft end on the weft side is sucked into the pipe 17 through the notch 17a by the action of the air jet from the air jet nozzle 18 in the pipe 17 and the suction airflow generated around it, and Towed and held (Fig. 4B)
State). This pulling and holding state continues until the weft yarn is delivered to the tuck-in needle 6 after the next weft insertion, but since it is pulled and held by the air flow, slack does not occur.

Next, the next weft yarn from about 90 ° is inserted and the beating process continues, but the tuck-in needle 6 shows the movement locus of its tip (hook portion 6a) as shown in FIGS. 2 and 3. , And the range of movement in the front-back direction is moved to 0 as shown in FIG.
From 1 ° to 200 °, one row of warp yarns near the weaving cloth 3 gradually swings toward the weaving cloth 3 side from the upper side in the front-rear direction, and swings downward, separating the upper side warp threads 1 into the opening. Then, the yarn goes out of one row of the warp yarns, passes under the weft yarn end portion stretched between the selvage and the air nozzle type yarn retainer 13 obliquely intersecting the weft yarn end portion, and finally, The hook part 6a
Reaches slightly above the warp line (see Figure 3).

Then, the tack-in needle 6 starts swinging in the opposite direction from 200 °, but at this time, the cam 55 causes the guide lever to move.
20 swings counterclockwise in FIG. 5 and pushes the end of the weft thread stretched between the selvage and the air nozzle type thread retainer 13 toward the tuck-in needle 6. As a result, when the tuck-in needle 6 swings in the opposite direction, its hook portion 6a
The end portion of the weft thread is reliably caught on the back side, and the tip end of the tuck-in needle 6 returns to the warp opening when hooked,
The weft yarn end is folded back as shown by the chain line in FIG. 7 and inserted into the next warp shed which is in the opposite phase to the portion already woven as the woven cloth 4.

Then, at around 270 °, the tuck-in needle 6 separates the upper warp 1 from the warp shed and escapes, and then also escapes from the repulsion path of the reed 2.

Then, when the weft yarn that has been inserted by the forward movement of the reed 2 is beaten, the weft yarn end portion that is folded back as described above at the woven selvage portion and inserted into the warp shed is beaten at the same time, and the selvage tissue is seized. Is formed.

Here, a throttle valve or the like (not shown) as a pressure changing device is provided in the middle of the supply path of the pressure air to the air nozzle type thread retainer 13 so that the supply pressure of the air is changed according to the thread type. Be prepared to change it.

Further, pressure air may be constantly supplied to and ejected from the air nozzle type yarn retainer 13, but a control valve that opens and closes at a predetermined timing is provided in the pressure air supply passage, and at least It is also possible to reduce the consumption of the compressed air by ejecting air only immediately before the cutting of the weft by the cutter 10 until the end of the delivery of the weft to the tuck-in needle 6.

Further, in the above embodiment, the tuck-in ear assembly device on the weft insertion side has been described, but it goes without saying that the tuck-in ear assembly device for the anti-weft insertion side or the middle ear can be configured in the same manner.

<Effect of the Invention> As described above, according to the present invention, the weft end portion in the free state is pulled and held in the tension state by the action of the air flow until it is captured by the tuck-in needle.
There is no slack in the weft thread, and there is no need for timing adjustment, so that the weft thread can be reliably captured by the tuck-in needle, and good ear tissue can be formed. In particular, since the jet air flow is used, a large traction force can be obtained with a small flow rate, and the pressure changing device is provided to change the traction force of the jet air flow, so that the optimum traction force suitable for various weft yarns can be obtained. The effect that it can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a tuck-in selvage device as seen from the side of a loom showing an embodiment of the present invention, FIG. 2 is a plan view of the same as above, FIG. 3 is a left side view of the same, and FIG. FIG. 5 is a cross-sectional view of the air nozzle type yarn retainer, FIG. 5 is a front view of the guide lever portion, FIG. 6 is a cross-sectional view of the inside of the gear box, and FIG. 1 ... Warp, 2 ... Reed, 3 ... Woven cloth, 4 ... Woven fabric, 6 ...
… Tuck-in needle, 10 …… Cutter, 13 …… Air nozzle type thread retainer, 17 …… Pipe, 17a …… Notch, 17b…
… Through hole, 17c… Thread holding part, 18… Air jet nozzle, 19
...... Weft guide, 20 ... Induction lever

Claims (1)

[Claims] 1. A tuck-in needle (6) swingably supported so as to catch the beated end of the weft and turn it back to insert it into the next warp opening, and the weft end until it is caught by the needle. A tuck-in selvedge device of a fragment loom having a yarn retainer (13) for holding a thread portion, wherein the yarn retainer (13) is provided with an air ejection nozzle (18) and an air flow from the air ejection nozzle (18). Through hole (17
b) and the thread holding part (17c), and the cloth fell (3)
A tuck-in selvage device for a fragment loom, characterized in that it is arranged on a substantially rearward side of the warp line, and a pressure changing device is provided in the middle of a supply path of compressed air to the air ejection nozzle (18).