JPH05331723A - Roving cutting method in roving exchanging machine - Google Patents

Abstract

PURPOSE:To surely cut a new roving held by a roving joint head into a length which does not constitute hindrance to jointing of roving. CONSTITUTION:A roving end of roving bobbin is subjected to pick finding by a suction nozzle and simultaneously, roving R is introduced into a roving guide groove formed at the top of a roving joint head PH. Then the roving is cut into a state where the roving end is hung below from a roving guide groove of the roving joint head PH. Then a gas is blown toward a roving end part in a state where roving R introduced into the roving guide groove is held by a holding member 23. A fiber which is not held by a holding member 23 is blown off and a fiber having nearly fiber length from holding point by a holding member is left and a roving end existing ahead of the holding member has definite length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention exchanges a roving bobbin being spun on a creel of a spinning machine (spool) and a full bobbin suspended on a spare roving rail (spare roving). The present invention relates to a roving yarn cutting method in a roving yarn changer for performing the work described above, and particularly to a method for cutting a new roving yarn drawn from a full bobbin.

[0002]

2. Description of the Related Art In a spinning machine, especially a ring spinning machine, a roving yarn is drawn out from a roving reel wound on a creel and supplied to a draft part below. When the supply of roving to the draft part progresses and the roving winding becomes empty or approaches empty, it is necessary to replace it with a new roving winding.At that time, the roving end of the roving winding to be newly replaced with the roving being spun It is necessary to splice the roving. Conventionally, this roving splicing operation was generally performed manually, but in recent years, automation of the roving splicing operation has been proposed.

As a roving splicing method using a roving splicing machine, a new roving to be spliced in a roving (shino) guide groove of a roving (shino) splicing head is polymerized with an old roving being spun. Along with the feeding of the old roving, the overlapping portion is guided to the back roller of the draft part, and the overlapping portion of the new roving and the old roving is held by the back roller, and then the old roving is held by the roving holding member. A method of cutting is proposed in JP-A-62-57957. However, in this method, the new roving is guided by the old roving and moves at the peripheral speed of the back roller, and there is a long waiting time until the overlapping section reaches the gripping position by the back roller through the trumpet, and the roving joining is completed. There is a problem that it takes a long time. In particular, when spinning a fine yarn of high-quality yarn, the spinning speed is slow and the peripheral speed of the back roller is slow, so that the roving joint time becomes long.

As a roving splicing method for solving this problem, a roving (old roving) connected from the roving winding during spinning to the trumpet of the draft part and a preliminary roving to be replaced with the roving are drawn. A roving splicing head that can hold the roving (new roving) is provided, and the roving splicing head is moved to a work position near the upper part of the draft part while holding the new roving, and spinning is performed at that position. Grasp and cut the old roving with the roving splicing head, then release the old roving while gripping the new roving,
A roving splicing method in which a roving splicing head is rotated to insert a new roving into a trumpet is disclosed in Japanese Patent Laid-Open No. 2-112426.

As a method of taking out the roving thread end from the preliminary roving bobbin (full bobbin), grasping it with the roving splicing head, and cutting the roving thread end, Japanese Unexamined Patent Publication (Kokai) No. 62-57957 discloses a method for cutting the roving thread. After suctioning the roving thread end from the surface of the preliminary roving winding with the suction pipe installed in the yarn changer and moving it out, the suction pipe is moved to the lower side of the roving splicing head located downward while sucking the roving thread end. There is disclosed a method in which the roving yarn is guided to the grip portion, and the roving yarn splicing head is rotated upward after the roving yarn splicing head is gripped by the grip portion in that state to cut the roving yarn.

Further, in Japanese Patent Laid-Open No. 2-112426, etc., the roving yarn end is sucked from the surface of the preliminary roving winding by a suction nozzle equipped in the roving yarn changing machine, and then the roving yarn end is sucked. The suction nozzle is moved to the lower side of the roving splicing head located downward, and then the roving splicing head is rotated upward to introduce the intermediate portion of the roving thread connected from the preliminary roving spool to the suction nozzle to the grip portion. At the same time, a method is disclosed in which after the roving yarn is held by the holding portion, the roving yarn joining head is reciprocally rotated in the vertical direction to cut the roving yarn.

The suction pipe (suction nozzle) is equipped with a known roving yarn cutting member (for example, Japanese Patent Publication No. 47-51649), and the roving yarn splicing head is moved away from the suction pipe while the roving yarn is held. By rotating the roving, the roving is cut between the roving splicing head and the suction pipe. That is, as shown in FIG. 23, the suction pipe 60
Comb 6 as a roving cutting member near the inner entrance
1 is fixed so that its tip is inclined toward the downstream side of the suction pipe 60. The tip of the comb 61 is formed in a saw-tooth shape. Then, when the roving splicing head (not shown) moves in a direction in which the new roving R is sucked by the suction pipe 60, the new roving R is pulled in a direction in which the new roving R comes out of the suction pipe 60. Be done.
At this time, the comb 61 bites into the new roving R, and the new roving R is partially gripped by the roving splicing head and pulled while the comb 61 is partially gripped by the roving splicing head and the suction pipe. Be cut in between.

[0008]

However, since the comb 61 is provided inside the suction pipe 60 in the conventional new roving cutting method, the roving length after cutting varies or the roving is cut. There was a problem of uncertainty. This is because the new roving yarn is cut at the weakest part between the two gripping portions, so the longer the distance from the new roving yarn gripping portion of the roving joint head to the comb 61 which is the gripping portion on the downstream side, the longer the cutting position. Variation occurs. Further, in order that the comb 61 bites into the new roving R and grips it securely, the part of the comb 61 is kept in a predetermined state by the suction action of the suction pipe 60 while the roving of a certain length is connected downstream from the comb 61. It is necessary to receive the tension above the value. However, the new roving R may be torn in the suction pipe 60 and the length on the downstream side of the comb 61 may be shortened, resulting in uncertain roving cutting.

If the end portion of the new roving yarn held by the roving yarn splicing head after cutting is long, the tip end of the new roving yarn comes into contact with the inner wall of the trumpet and is bent when it is inserted into the trumpet. As a result, the trumpet may be introduced into the draft part in a bent state even if it is jammed in the trumpet or sent out from the trumpet outlet to the back roller side. When the tip of the new roving is introduced into the draft part in a bent state, the bent part cannot be grasped between the rollers in the draft part, and the draft passes through as an incomplete draft. Then, the yarn spun from the front roller becomes a slab and the balloon becomes excessive, and the yarn is caught by the slab catcher of the snell wire and broken.
Also, if it is inserted into the trumpet without bending, the overlapping part (coarse yarn joint) between the new roving and the old roving becomes long, and the balloon of the yarn spun from the front roller becomes too large and the slab becomes too large. The catcher gets caught and the thread is cut.

In order to surely cut the new roving yarn at a position where the end thereof has a predetermined length from the grip portion of the roving yarn splicing head, it is conceivable to equip the roving yarn splicing head with a cutter. But,
When the roving yarn is cut by the cutter, there are many fibers at the roving yarn end that are shorter than the distance between the grips of the rollers of the draft part, and the roving yarn in that portion is spun in a slab shape without being drafted. There is a problem that the ballooning changes sharply due to a large centrifugal force when the part is wound up and the yarn breaks.

The present invention has been made in view of the above problems, and an object thereof is to reliably cut a new roving yarn grasped by a roving yarn splicing head into a length that does not hinder the roving yarn splicing. It is to provide a roving cutting device in a roving changer.

[0012]

In order to achieve the above object, in the present invention, the roving ends of the roving spool are fed out by a tapping means and the roving guide groove formed at the tip of the roving splicing head is provided with a coarse yarn guide groove. After introducing the thread and cutting the roving thread so that the roving thread end hangs downward from the roving thread guide groove of the roving splicing head, the roving thread introduced into the roving thread guide groove is coarsely gripped by the gripping member. A gas was blown toward the yarn end so that the fibers not held by the holding member were blown off.

[0013]

Function: The roving yarn, which is ejected from the preliminary roving winding surface arranged above the roving yarn splicing head by the spouting means, is introduced into the roving yarn guide groove of the roving yarn splicing head. The roving yarn introduced into the roving yarn guide groove is cut so that the roving yarn end is in a state of hanging downward from the roving yarn guide groove of the roving yarn joining head. afterwards,
Gas is blown toward the end of the roving yarn while the roving yarn introduced into the roving yarn guiding groove is held by the holding member. As a result, fibers that are not gripped by the gripping member are blown away,
A fiber having a length substantially equal to the fiber length remains from the gripping point of the gripping member, and the roving yarn end preceding the gripping member has a constant length.

[0014]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. The roving yarn splicing device moves along the spinning machine stand to perform the roving yarn changing operation (see FIG. 9).
It is equipped with a part of the external shape). Roving changer 1
The basic configuration such as the disposition position of the roving splicing device is the same as that disclosed in Japanese Patent Application Laid-Open No. 2-127368 previously proposed by the applicant of the present application.

As shown in FIGS. 1 to 3, the roving splicing head P is used.
H is rotatably supported by the tip of the support arm 2 of the roving joining device. The support arm 2 is arranged to rotate the roving splicing head PH between a roving splicing position above the draft part and a standby position / new roving gripping position that does not hinder the movement of the roving changer by a driving device (not shown). It has become so. As shown in FIG. 3, a substantially U-shaped mounting portion 2a is formed at the tip of the support arm 2, and the rotary shaft 3 is supported in a state of protruding laterally of the mounting portion 2a. A toothed pulley 4 is integrally rotatably fitted and fixed to the rotary shaft 3 at a position corresponding to the inside of the mounting portion 2a, and the motor drive shaft is fixed to the toothed pulley 4 and the base end of the support arm 2. The toothed belt 5 is wound around a toothed pulley (not shown) fitted to the. Then, the roving splicing head PH is integrally rotatably fixed to the rotation shaft 3 of the portion projecting to the side of the mounting portion 2a so that the roving splicing head PH is rotated by the drive of the motor. There is. When a servo motor, a stepping motor, or the like is used as the motor, it is easy to adjust the rotation angle of the roving joining head PH.

A bulging portion 6a having an inclined surface that descends and slopes rearward is formed at the tip of the head body 6 of the roving splicing head PH, and the tip of the bulging portion 6a guides the roving yarn to the draft part 7. The trumpet 8 (all shown in FIGS. 18 to 20) has a shape that allows it to enter. The outlet 8a of the trumpet 8 is formed vertically so that the new roving R can sufficiently pass in the state where the old roving R1 being spun exists.
A roving guide groove 9 is formed at the tip of the head body 6 so as to extend in the longitudinal direction and the up-down direction of the head body 6.
The bulging portion 6a is provided with a notch 10 on one side of the swelling portion 6a, which communicates with the roving yarn guiding groove 9 and opens the roving yarn guiding groove 9 rearward and laterally of the bulging portion 6a. Has been formed.

A block 11 having the cutout portion 10 is separately formed in the head main body 6 and is integrally fixed with a screw or the like not shown. As shown in FIGS. 4 and 8B,
A flat concave portion 13 is formed in a front position of the cutout portion 10 in the block 11 in a state where the flat concave portion 13 is open upward and on the roving yarn guide groove 9 side. The recess 13 has the plate 1 on the roving guide groove 9 side.
The first injection nozzle 12 which is covered with 4 and injects the compressed air flow is constituted. The plate 14 is fixed so as to be flush with the wall surface 9a of the roving guide groove 9. A fitting hole 15 is formed in the block 11 so as to communicate with the recess 13 from the side opposite to the roving guide groove 9, and one end of the fitting hole 15 is connected to a compressed air source (not shown) such as a compressor. The other end of the pipe 16 is fitted. The pipe 16 is equipped with a control valve 17 capable of adjusting the flow rate for controlling the injection timing of the compressed air from the injection nozzle 12.

As shown in FIGS. 4 and 6, the head body 6
An accommodation recess 18 is formed on the side facing the block 11 in a state of extending along the roving guide groove 9 at a position corresponding to the base end of the roving guide groove 9. Accommodation recess 18
A flat recess 19 is formed at a position corresponding to the upper side of the. The tip of a pipe 20 forming the second injection nozzle is housed in the housing recess 18, and is fixedly held by a pressing plate 21 fitted and fixed in the recess 19. The pressing plate 21 is fitted in the recess 19 so as to be flush with the wall surface 9b.
Further, as shown in FIGS. 5B and 6A, the pipe 20
The tip of the housing is below the notch 10, and the housing recess 18
It is housed in the housing recess 18 in a state of being spaced from the lower end of the housing by a predetermined distance. The pipe 20 is connected to a compressed air source (not shown) such as a compressor via a known variable adjustment pressure reducing valve.

As shown in FIGS. 1 to 3, the head body 6
The support pin 22 is provided at the rear of the bulging portion 6a,
It is rotatably attached so as to project to both upper and lower sides. A gripping member 23 for gripping the new roving R is attached to the lower end of the support pin 22 in such a manner that the distal end thereof is inserted into the cutout portion 10 and the base end thereof is integrally rotatable. A lever 24 is fixed to the upper end of the support pin 22 so as to be integrally rotatable at one end thereof while extending along the longitudinal direction of the head body 6. The gripping member 23 has a gripping portion 23a which enters the roving thread guiding groove 9 by the rotation of the support pin 22 and cooperates with the pressing plate 21 to grip the new roving R, and a gripping portion 23a. Is movably arranged at a standby position which is retracted from the roving guide groove 9 and allows the roving to move within the roving guide groove 9.

A support block 25 is integrally rotatably fixed to the rotary shaft 3 near the support arm 2, and a support plate 26 is fixed between the support block 25 and the upper surface of the base end of the head body 6. .. A support 27 is erected on one end of the support plate 26 (close to the support arm 2), and a plate 28 is fixed to the tip of the support 27. An air cylinder 29 is supported by the plate 28 at its base end via a support shaft 30 so as to extend in a direction orthogonal to the head body 6. The air cylinder 29 has its piston rod 29.
a is rotatably connected to the other end of the lever 24 via a pin 31. The gripping member 23 is rotated via the lever 24 by the operation of the air cylinder 29. A cover 32 that covers the lever 24 and the air cylinder 29 is attached to the roving splicing head PH via an attachment member (not shown) fixed to the support plate 26. The tip of the cover 32 extends to near the center of the roving thread guide groove 9, and a groove 32a is formed at a position corresponding to the roving thread guide groove 9.

As shown in FIG. 9 and the like, a suction nozzle 33 as an outlet means is arranged at a position corresponding to the roving splicing head PH arranged at the standby position. Suction nozzle 3
3 is fixed to the tip of the suction pipe 34, is removed from a preliminary roving winding rail (not shown) so as to facilitate the tapping work, and is supported on a full bobbin lifting device 35. Is provided movably between a roving end suction position above the roving splicing head PH and a roving introduction position / standby position below the roving splicing head PH by the action of a drive mechanism (not shown). ing. Suction pipe 34
Is connected to a cotton collection box (not shown) that produces a suction action by driving a blower as a suction source.
The peg 35a mounted on the full bobbin lifting device 35 is rotatable by a drive mechanism (not shown).

As shown in FIG. 7, the suction nozzle 33 is formed in two and is fixed by screws 36. It may be integrally formed instead of being divided into two. A roving cutting member 37 is fastened and fixed to the outside of the suction nozzle 33 with a screw 38. The roving cutting member 37 includes a support plate 39 having an upper portion formed in a substantially triangular shape, and a comb 40 fixed at a position corresponding to the base of the triangular shape with the needle 40a facing downward. The comb 40 is formed by fixing a large number of needles 40a to a thin plate. The roving cutting member 37 is fixed above the inlet 33a of the suction nozzle 33 so that the needle 40a can be locked with respect to the roving when the roving relatively moves upward. The two hypotenuses of the triangular portion of the support plate 39 allow the roving to pass through the needle 4 when the suction nozzle 33 rises.
A guide portion 39a for guiding the lower side of 0a is configured.
The material of the roving cutting member 37 is not particularly limited to metal, resin, ceramics, etc., but stainless steel is preferable from the viewpoint of rust prevention.

Next, the operation of the apparatus configured as described above will be described. When the new roving R, whose roving ends are projected from the full bobbin F, is gripped by the roving splicing head PH, the roving splicing head PH is arranged downward at the standby position as shown in FIG. Numeral 23 is arranged at a standby position where the roving yarn can freely enter into the roving yarn guide groove 9. On the other hand, the full bobbin F is removed from the preliminary roving winding rail by the full bobbin lifting device 35, and is placed in the vicinity of the roving splicing head PH where it is easy to put out. In this state, the suction nozzle 33 is lifted from the standby position (original position) and, as shown in FIG. 10, is arranged at a roving yarn end suction position above the roving joint head PH and close to the lower peripheral surface of the full bobbin F. To be done. The suction force is applied to the suction nozzle 33 from the suction source via the suction pipe 34 during or after the suction nozzle 33 is lifted.

After the suction nozzle 33 is placed at the roving yarn end suction position and the suction force is applied to the suction nozzle 33, the peg 35a of the full bobbin lifting device 35 makes one or more revolutions in the roving direction. It is preferably rotated about 1.5 times. While the full bobbin F rotates, the roving yarn end is brought into a state corresponding to the inlet portion 33a of the suction nozzle 33, at which point the roving yarn end is sucked by the suction nozzle 33. Full bobbin F is 1
After being rotated by a predetermined amount equal to or more than the rotation, the suction nozzle 33 is lowered. At this time, the full bobbin F is rotated at a speed corresponding to the descending speed of the suction nozzle 33 in the direction in which the roving yarn is fed, and the roving yarn is pulled out from the full bobbin F without tearing as the suction nozzle 33 moves downward. After the suction nozzle 33 descends to the original position, the rotation of the peg 35a is stopped and the state shown in FIG. 11 is obtained. The original position also serves as the roving introduction position.

Next, a motor (not shown) is driven, and the roving splicing head PH is rotated counterclockwise from the downward standby position shown by the chain line in FIG. 11 and placed at the horizontal position shown by the solid line. At this time, since the gripping member 23 is arranged at the standby position, the new roving R is introduced into the roving guide groove 9 as the roving joining head PH rotates. Then, the air cylinder 29 is operated in a state where the new roving R is introduced deep into the roving guide groove 9, and the gripping member 23 is rotated together with the lever 24 by the protrusion operation of the piston rod 29a. And FIG.
And, as shown in FIG. 8 (b), the grip portion 23 a has the pressing plate 21.
Is arranged at a roving holding position for pressing the new roving R, and the new roving R is gripped by the roving joint head PH.

Next, the cutting action of the new roving R will be described. As shown in FIGS. 12 to 16, the suction nozzle 33 is not on the extension line of the roving yarn guide groove 9 of the roving yarn joining head PH, but is on a slightly displaced position. When the suction nozzle 33 is lifted up again from the original position in a state where the end portion of the new roving R gripped by the roving splicing head PH is sucked by the suction nozzle 33, FIGS. 13 (a) and 13 (b). As shown in, the guide portion 39a of the roving cutting member 37 starts to engage with the new roving R during the ascent, and the new roving R slides down along the guide 39a as the suction nozzle 33 rises. Then, as shown in FIG.
As shown in (b), when the lower end of the guide portion 39a reaches above the lower end of the bulging portion 6a of the roving joint head PH, the new roving R is located at a position directly facing the needle 40a on one side of the comb 40. Be induced. The suction nozzle 33 is further raised from the state shown in FIGS.
As shown in (b), when the upper end of the inlet portion 33a of the suction nozzle 33 reaches above the lower end of the bulging portion 6a, the suction nozzle 33 is stopped from rising. The suction nozzle 3
Since the new roving R does not engage with the needle 40a during the ascent of 3, the new roving R does not loosen during the ascent.

Next, the suction nozzle 33 is lowered, and the new roving R is locked to the needle 40a of the comb 40 during the lowering as shown in FIGS. 16 (a) and 16 (b). One of the new rovings R is gripped by the roving splicing head PH, and the other is suction nozzle 33.
Since the needle 40a is sucked in and tensioned, the needle 40a is reliably locked. Then, when the suction nozzle 33 further descends from this state, the fibers of the new roving R are pulled out by the action of the comb 40 between the grip point of the roving splicing head PH and the comb 40, as shown in FIG. It is cut like a brush in the state. The roving on the side of the suction nozzle 33 after cutting is accommodated in a cotton collection box (not shown) through the suction pipe 34 by the action of the suction airflow.

Next, as shown in FIG. 1, compressed air is jetted from the pipe 20, and the air is blown to the end of the new roving R after cutting. The pressure of the compressed air is approximately 3 to 5 atmospheres, and the injection time is 1 to 2 seconds. The air blown to the roving yarn ends blows off the fibers not held by the holding member 23. Therefore, the fibers having a length substantially equal to the fiber length remain before the gripping point of the gripping member 23, and the length of the roving end becomes constant. When the new roving R is cut by the action of the comb 40, the length of the roving end after cutting, that is, the new roving before the gripping point by the gripping member 23 is caused by the variation in the tension acting on the new roving R. The length of the thread R may vary. However, as described above, when compressed air is blown to the end of the roving yarn after the cutting of the new roving R by the action of the comb 40, the new roving R is sure to have almost the fiber length from the gripping point to the roving end. Will be the length of.

After the cutting of the new roving R, the support arm 2 is tilted to the spinning machine base side, and the roving splicing head PH is moved to the roving splicing operation position near the upper part of the draft part. The old roving R1 being spun is introduced into the roving guide groove 9 while the roving joining head PH is moving to the roving joining position.
Since the gripping member 23 is arranged at the roving thread gripping position, the old roving thread R1 is prevented from moving to the inner side from the tip of the gripping member 23, and the old roving thread R1 is located at a position corresponding to the jet nozzle 12. Held in. After the roving splicing head PH is placed at the roving splicing operation position, the control valve 17 is opened at the same position, and the compressed air is jetted from the jet nozzle 12 at a predetermined pressure corresponding to the type of spun yarn. Since the injection port of the injection nozzle 12 faces upward, the injection airflow acts to pull the old roving R1 upward. Then, the old roving R1 is cut like a writing brush in a state where the single fibers are unwound at a predetermined position where the jet airflow hits. The old roving R1 after cutting is in a state of hanging behind the trumpet 8 as shown in FIG.

Next, compressed air having a pressure lower than the injection pressure at the time of cutting the new roving R (approximately 0.6 to 1.2 atm) is injected from the pipe 20. The pressure of the compressed air is adjusted to a proper pressure at the time of cutting the new roving and a proper pressure at the time of introducing the roving by a variable adjusting pressure reducing valve provided in the middle of the pipe 20. The compressed air becomes an air flow along the accommodating concave portion 18, and the end portion of the new roving R is held in a straight state by the action of the jet air flow.

The roving splicing head PH is rotated clockwise from the position shown in FIG. 18 while the compressed air is being jetted, and the roving splicing head PH is introduced into the trumpet 8 shown in FIG. Placed in position. In the state where the roving yarn splicing head PH is arranged at the new roving yarn end introduction position, the jet airflow from the pipe 20 is held in a state of guiding the new roving yarn end toward the outlet 8 a of the trumpet 8. Therefore, the tip of the new roving R gripped by the gripping member 23 has the outlet 8 of the trumpet 8.
It is held in a state of being straightened toward a. Next, the air cylinder 29 is operated to release the grip of the new roving R by the grip member 23. Then, the new roving R is moved toward the outlet 8a of the trumpet 8 by the action of the jet airflow, and is pushed out from the outlet 8a to the back roller 7a side (state in FIG. 20). Then, the new roving R is superposed on the old roving R1 and supplied to the back roller 7a for roving splicing, and thereafter, the spinning is continued by the new roving R. The injection of the compressed air from the pipe 20 is stopped when the tip of the new roving R is caught by the back roller 7a.

At the end of the new roving R, the single fiber is not cut but is cut like a writing brush so that it passes through the draft part 7 while being drafted between the front and rear rollers. No slab yarn is generated, and yarn breakage due to the sudden enlargement of the balloon is eliminated. In addition, since the new roving R is cut to a length substantially equal to the fiber length from the gripping point to the end of the roving, the balloon of the yarn spun from the front roller becomes too large and is caught by the slab catcher, resulting in yarn breakage. As a matter of fact, the length of the polymerized portion (the roving joint) at the time of joining the roving does not become long.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the configuration of the second jet nozzle provided in the roving splicing head PH is different from that of the above embodiment. That is, a groove 41 extending parallel to the longitudinal direction of the head body 6 is provided at a lower portion of the head body 6 facing the block 11, and a position communicating with the groove 41 and facing the base end of the roving yarn guide groove 9. And a groove 42 that extends downward at. An end portion of a pipe 43 connected to a compressed air source is connected to a base end of the groove 41 via a hose joint 44. Also, FIG. 21 (a)
As shown in FIG.
Covered with 5. Therefore, in this roving splicing head PH, when compressed air is supplied from the pipe 43, a part of the compressed air supplied is jetted from the tip side of one groove 41 toward the front side of the roving splicing head PH. The rest is sprayed from the tip side of the other groove 42 in the same direction as in the above embodiment.

When the roving splicing head PH of this embodiment is used to perform the roving splicing operation in the same manner as in the previous embodiment, the roving guide groove 9 is formed.
Even when the old roving R1 is loosely sandwiched in the roving guide groove 9 without a sufficient width with respect to the roving, the jet air flow from the groove 41 is cut after the old roving R1 is cut. Due to the action, the old roving R1 is immediately and surely separated from the inside of the roving guide groove 9 and hangs behind the trumpet 8. Therefore, immediately after cutting the old roving R1, the new roving R
Can be inserted into the trumpet 8 and the roving splicing time can be shortened.

The present invention is not limited to the above-described embodiments. For example, instead of the pipe 20, the head body 6 is grooved to form a second injection nozzle, or a roving guide groove is formed. You may employ | adopt the structure which injects an airflow from both sides on both sides of 9. Further, the arrangement pitch of the needles 40a of the comb 40 and the length of the needles may be appropriately changed according to the type of fiber and the thickness of the roving. In addition, a large number of needles 40a to combs 40
Alternatively, the comb 40 may be formed of a thin plate having a sawtooth cut.

Further, instead of cutting the new roving R by the comb 40, the roving splicing head PH is equipped with a cutter, and the new roving is provided at a position where the length from the gripping point by the gripping member 23 is longer than the fiber length. After the R is cut or the new roving R is cut by another method, the compressed air may be jetted from the second jet nozzle. Further, the injection of compressed air from the second injection nozzle for blowing out the fibers not held by the holding member 23 among the fibers at the end of the new roving R is not limited to immediately after the cutting of the new roving R, It may be performed while the roving splicing head PH is moved to the roving splicing operation position or after cutting the old roving R1. Further, the cutting of the old roving R1 is not limited to the method of the above-described embodiment using compressed air, and an appropriate method may be adopted. Further, in the case of spinning a fiber having a long fiber length, the gripping member 23 is arranged on the upper part of the head body 6 to increase the distance from the gripping point of the new roving R to the lower end of the bulging portion 6a. The length of the fibers protruding from the lower end of the splicing head PH may be set so as not to interfere with the insertion into the trumpet 8. Further, the roving splicing device may be equipped with two roving splicing heads PH or a set of three or more roving splicing heads PH, and may be applied to a device for performing roving splicing operation for a plurality of spindles at the same time. Furthermore, the invention is not limited to a roving splicing device that performs so-called replenishment, which cuts the old roving R1 before inserting the new roving R into the trumpet 8, and is disclosed in Japanese Patent Laid-Open No. 62-57957. It may be applied to a roving splicing device that cuts the old roving R1 after inserting the new roving R into the trumpet 8 like the device.

[0037]

As described above in detail, according to the present invention, when the roving yarn end is ejected from the preliminary roving yarn winding, the new roving yarn held by the roving yarn splicing head is almost completely separated from the gripping point by the roving yarn splicing head. Since the length of the roving yarn protruding from the roving yarn splicing head can be reliably cut with a long length, it will be constant if the spinning conditions are the same, and the roving yarn end will contact the wall surface of the trumpet during roving yarn splicing. As a result, it is possible to surely prevent the bending and the length of the overlapped portion with the old roving yarn (the roving joint) to be longer than necessary, and the roving joint success rate is improved.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a new roving is cut in a first embodiment.

FIG. 2 is a side view of a roving splicing head.

FIG. 3 is a plan view of the roving yarn splicing head with the cover removed.

FIG. 4 is a partial plan view of a roving splicing head.

5A is an enlarged sectional view taken along line II-II of FIG. 2, and FIG. 5B is a sectional view taken along line VV of FIG.

6A is a sectional view taken along the line EE of FIG. 5B, FIG.
FIG. 7A is a sectional view taken along line FF of (a).

FIG. 7A is a rear view showing a state in which a roving cutting member is attached to a suction nozzle, and FIG. 7B is a side view.

8A is a front view of a roving yarn cutting member, and FIG. 8B is a vertical cross-sectional view of a roving yarn splicing head tip portion.

FIG. 9 is a side view showing a state in which the full bobbin is arranged at the roving yarn outlet position, and the suction nozzle and the roving yarn splicing head are arranged at the standby position.

FIG. 10 is a side view showing a state in which a suction nozzle is arranged at a roving end suction position.

FIG. 11 is a side view showing a state where a new roving is introduced into a roving guide groove of the roving splicing head.

FIG. 12 (a) is a side view showing the positional relationship between a suction nozzle and a roving jointing head arranged at a roving introduction position, and FIG. 12 (b) is a front view.

13 (a) is a side view showing a state where the suction nozzle is raised to a position where the guide portion engages with the new roving, and FIG. 13 (b) is a partially omitted A arrow view thereof.

FIG. 14 (a) is a side view showing a state in which the suction nozzle is raised to a position where the new roving is guided to the lower side of the locking portion,
(B) is the partially omitted B arrow view.

15A is a side view showing a state in which the suction nozzle has reached the highest position during the roving cutting operation, and FIG. 15B is a partially omitted C arrow view thereof.

16 (a) is a side view showing a state in which the suction nozzle has been raised to a position where the new roving is locked by the locking portion, and FIG. 16 (b) is a partially omitted view of the arrow D.

FIG. 17 is a side view showing a state where the new roving is cut.

FIG. 18 is a side view showing a state in which the old roving after cutting hangs down from the trumpet.

FIG. 19 is a side view showing a state in which the roving yarn splicing head is arranged at a new roving yarn end introducing position.

FIG. 20 is a side view showing a state in which a new roving yarn end is inserted into a trumpet outlet.

FIG. 21 (a) is a side view showing the tip of the roving splicing head from which the block of the second embodiment has been removed, and FIG. 21 (b) is a front view thereof.

22 (a) is a cross-sectional view taken along the line GG of FIG. 21 (a),
21B is a sectional view taken along the line HH of FIG.

FIG. 23 is a side sectional view showing an attached state of a conventional roving cutting member.

[Explanation of symbols]

6 ... Head body, 9 ... Rough thread guide groove, 20 ... Pipe, 23
... Gripping member, 33 ... Suction nozzle that constitutes the ejection means,
37 roving cutting member, F ... full bobbin (spare roving), PH
... roving splicing head, R ... new roving, R1 ... old roving.

Claims (1)

[Claims] 1. A roving yarn end of a roving winding is fed by a tapping device and a roving yarn is introduced into a roving yarn guide groove formed at the tip of the roving yarn splicing head, and the roving yarn end is a roving yarn of the roving yarn splicing head. After cutting the roving yarn so that it hangs downward from the guide groove, blow the gas toward the end of the roving yarn while holding the roving yarn introduced into the roving yarn guide groove with the holding member, and hold it by the holding member. A method for cutting roving in a roving changer that blows away unloaded fibers.