JP3104401B2 - Roving yarn cutting method in roving yarn changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention replaces a roving bobbin (roof winding) suspended on a creel of a spinning machine with a full bobbin (pre-roof winding) suspended on a preliminary roving winding rail. More particularly, the present invention relates to a method for cutting a new roving thread drawn from a full bobbin.

[0002]

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

As a roving method by a roving splicer, a new roving to be spliced in a roving (shino) guide groove of a roving (shino) splicing head is superimposed on an old roving being spun. At the same time, as the old roving is fed, the overlapping portion is guided to the back roller of the draft part, and after the overlapping portion of the new roving and the old roving is gripped by the back roller, the old roving is gripped by the roving gripping member. A cutting method has been proposed in, for example, 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 the waiting time until the overlapping portion reaches the gripping position by the back roller via the trumpet is long, and the roving splicing is completed. There is a problem that it takes a long time. Particularly when spinning fine yarn of high-grade yarn, the spinning speed is slow and the peripheral speed of the back roller is also slow, so that the roving yarn splicing time is long.

As a roving splicing method for solving this problem, a roving (old roving) connected to a trumpet of a draft part from a roving wound during spinning and a preliminary roving wound to be replaced with the roving wound. A roving splicing head capable of gripping a 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 the new roving is gripped, and spinning is performed at that position. The old roving is gripped and cut by the roving splicing head, and then the old roving is released while holding the new roving,
A method of splicing a roving yarn in which a roving splicing head is rotated to insert a new roving yarn into a trumpet is disclosed in Japanese Patent Application Laid-Open No. 2-112426.

Japanese Patent Application Laid-Open No. 62-57957 discloses a method of removing a roving end from a preliminary roving winding (full bobbin), holding the roving end with a roving splicing head, and cutting the roving end. After sucking the roving end from the preliminary roving winding surface with the suction pipe equipped with the yarn changing machine and discharging it, the suction pipe is moved downward to the position below the roving splicing head located while sucking the roving end. A method is disclosed in which the roving yarn is guided to a gripping portion, and in this state, the roving yarn is gripped by the gripping portion, and then the roving splicing head is rotated upward to cut the roving yarn.

Japanese Patent Application Laid-Open No. 2-112426 discloses that the roving end is sucked from a preliminary roving winding surface by a suction nozzle provided in a roving yarn changer, and then the roving end is sucked. The suction nozzle is moved below the roving splicing head positioned downward, and then the roving splicing head is rotated upward to introduce the middle of the roving from the preliminary roving winding to the suction nozzle. Also disclosed is a method of cutting the roving by reciprocatingly rotating the roving splicing head in the vertical direction after the roving yarn is gripped by the gripping portion.

[0007] The suction pipe (suction nozzle) is equipped with a known roving cutting member (for example, Japanese Patent Publication No. 47-51649), and moves the roving splicing head away from the suction pipe while holding the roving. By rotating, the roving is cut between the roving splicing head and the suction pipe. That is, as shown in FIG.
Has a comb 6 as a roving cutting member near its internal entrance.
1 is fixed so that its tip is inclined toward the downstream side of the suction pipe 60. The end of the comb 61 is formed in a saw blade shape. When the roving splicing head (not shown) moves in a direction away from the suction pipe 60 in a state where the new roving R is sucked by the suction pipe 60, the new roving R is pulled in a direction to come out of the suction pipe 60. Can be
At this time, the comb 61 bites into the new roving thread R, and the new roving thread R is partially gripped by the roving thread splicing head and partially pulled while being held by the comb 61, so that the roving thread splicing head and the suction pipe are connected. Be cut between

[0008]

However, in the conventional new roving cutting method, since the comb 61 is provided in the suction pipe 60, the length of the roving after cutting varies, or the roving is cut. There was a problem of uncertainty. This is because the new roving is cut at the weakest portion between the two gripping portions, so that the longer the distance from the new roving gripping portion of the roving splicing head to the comb 61, which is the downstream gripping portion, is, the more the cutting position becomes. Variation occurs. Further, in order for the comb 61 to bite into the new roving yarn R and securely hold it, the roving yarn of a certain length continues in the downstream side of the comb 61, and the portion is subjected to a predetermined action by the suction action of the suction pipe 60. It is necessary to receive the tension more than the value. However, there is a case where the new roving yarn R is broken in the suction pipe 60 and the length on the downstream side of the comb 61 is shortened, so that the cutting of the roving yarn becomes uncertain.

If the end of the new roving held by the roving splicing head after cutting is long, the tip of the new roving abuts against the inner wall of the trumpet when inserted into the trumpet, causing bending. As a result, even if the trumpet is jammed or sent out from the outlet of the trumpet to the back roller side, it may be introduced into the draft part in a bent state. When the leading end of the new roving is introduced into the draft part in a bent state, the bent part cannot be gripped between the rollers in the draft part, and passes through as an incomplete draft. Then, the yarn spun from the front roller becomes slab-shaped, the balloon becomes excessively large, and is caught by the slab catcher of the snell wire, and the yarn is broken.
Also, if the new roving is inserted into the trumpet without bending, the overlapping portion (roving joint) of the new roving and the old roving becomes longer, and the balloon of the yarn spun from the front roller becomes excessively large, resulting in a slab. The catch is caught and the thread breaks.

In order to surely cut the new roving at a position where the end of the new roving has a predetermined length from the gripping portion of the roving splicing head, it is conceivable to equip the roving splicing head with a cutter. But,
When the roving is cut by the cutter, a large number of fibers shorter than the distance between the rollers of the draft part are present at the end of the roving, and the roving in the portion is spun out in a slab without being drafted. There is a problem that the ballooning suddenly changes due to a large centrifugal force at the time of winding and the yarn breaks.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a roving yarn cutting method in a roving yarn changing machine.
In law, certain new roving gripped by SoitoTsugi head reliably disconnect to Rukoto in length that does not hindrance to SoitoTsugi.

[0012]

In order to achieve the above object, according to the present invention, a roving end of a roving is wound from a suction nozzle.
The roving yarn is introduced into the roving guide groove formed at the tip of the roving splicing head, and the roving yarn
Outlet means and roving splicing head while holding the roving in the inner groove
By moving relative to the approach and separation directions.
Attach so that it is located outside the entrance of the drawing nozzle
The roving yarn is locked on the comb, and the roving yarn is cut so that the roving end hangs downward from the roving yarn guiding groove of the roving splicing head, and then the roving yarn introduced into the roving yarn guiding groove is gripped. A gas was blown toward the end of the roving while being gripped by the member, and the fibers not gripped by the gripping member were blown off.

[0013]

The roving yarn discharged from the preliminary roving yarn winding surface disposed above the roving yarn splicing head by the discharging 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 moved by the outlet means and the roving splicing head in a gripped state.
By being relatively moved in the approaching direction and the separating direction,
So that it is located outside the inlet of the suction nozzle.
Locked to the attached comb. Then, the roving end is cut so as to be in a state of hanging downward from the roving guide groove of the roving splicing head. Thereafter, gas is blown toward the roving end while the roving introduced into the roving guide groove is gripped by the gripping member. As a result, the fibers that are not gripped by the gripping member are blown off, fibers having a length substantially equal to the fiber length remain from the gripping point of the gripping member, and the roving end ahead of the gripping member has a constant length.

[0014]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The roving yarn changing device 1 moves along the spinning frame and performs roving yarn changing operation (FIG. 9).
Etc.). Roving yarn changer 1
The basic configuration such as the arrangement position of the roving splicer is the same as that disclosed in Japanese Patent Application Laid-Open No. 2-127368 previously proposed by the present applicant.

As shown in FIGS. 1 to 3, the roving splicing head P
H is rotatably supported at the tip of the support arm 2 of the roving splicer. The support arm 2 rotates the roving splicing head PH to a roving splicing position above the draft part, a standby position which does not hinder the movement of the roving yarn changer, and a new roving grasping position 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 rotating shaft 3 is supported so as to protrude to the side of the mounting portion 2a. A toothed pulley 4 is fitted and fixed to the rotation shaft 3 at a position corresponding to the inside of the mounting portion 2 a so as to be integrally rotatable, and a drive shaft of a motor fixed to the toothed pulley 4 and the base end of the support arm 2. A toothed belt 5 is wound around a toothed pulley (both not shown) fitted to the belt. The roving splicing head PH is fixed to the rotating shaft 3 at a portion protruding to the side of the mounting portion 2a so as to be integrally rotatable, and the roving splicing head PH is rotated by driving the motor. I have. When a servo motor, a stepping motor, or the like is used as the motor, the rotation angle of the roving splicing head PH can be easily adjusted.

A bulging portion 6a having a slope inclined downward toward the rear is formed at the tip of the head main body 6 of the roving splicing head PH, and the leading end of the bulging portion 6a guides the roving yarn to the draft part 7. The trumpet 8 (all shown in FIGS. 18 to 20) is formed in a shape that can enter the trumpet 8. The outlet 8a of the trumpet 8 is formed in a vertically long shape so that the new roving R can sufficiently pass in a 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 vertical direction of the head body 6.
The bulging portion 6a has a notch 10 on one side of the roving yarn guiding groove 9 and communicating with the roving yarn guiding groove 9 to open the roving yarn guiding groove 9 to the rear and side of the bulging portion 6a. Is formed.

The head body 6 is formed as a separate block 11 having the notch 10 and is integrally fixed with screws (not shown). As shown in FIGS. 4 and 8B,
A flat recess 13 is formed in the block 11 at a position in front of the notch 10 with the upper part and the roving guide groove 9 side open. The recess 13 has a plate 1 on the roving guide groove 9 side.
4 and constitutes a first injection nozzle 12 for injecting a compressed air flow. 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 concave portion 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 provided with a control valve 17 capable of controlling the flow rate of the compressed air from the injection nozzle 12.

As shown in FIG. 4 and FIG.
On the side facing the block 11, an accommodation recess 18 is formed extending along the roving guide groove 9 at a position corresponding to the base end of the roving guide groove 9. Housing recess 18
A flat concave portion 19 is formed at a position corresponding to the upper side of. The distal end of the pipe 20 constituting the second injection nozzle is accommodated in the accommodating recess 18, and is fixed and held by a pressing plate 21 fitted and fixed to the recess 19. The pressing plate 21 is fitted in the recess 19 in a state of being flush with the wall surface 9b.
Also, as shown in FIG. 5B and FIG.
The tip is below the notch 10 and the accommodation recess 18
Are housed in the housing recess 18 at a position spaced a predetermined distance from the lower end of the housing. The pipe 20 is connected to a compressed air source (neither is shown) such as a compressor through a known variable pressure reducing valve.

As shown in FIG. 1 to FIG.
A support pin 22 is provided behind the bulging portion 6a.
It is rotatably mounted so as to protrude from 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 so as to be integrally rotatable at its base end with its tip inserted into the notch 10. A lever 24 is fixed to the upper end of the support pin 22 so as to be integrally rotatable at one end in a state extending along the longitudinal direction of the head body 6. The gripping member 23 has a roving yarn gripping position where the gripping portion 23a enters the roving yarn guide groove 9 by the rotation of the support pin 22 and cooperates with the pressing plate 21 to grip the new roving yarn R. Are rotatably arranged to retreat from the roving guide groove 9 and to a standby position where the roving is allowed to move in the roving guide groove 9.

A support block 25 is fixed to the rotation shaft 3 near the support arm 2 so as to be integrally rotatable. 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 column 27 is erected at one end of the support plate 26 (close to the support arm 2), and a plate 28 is fixed to the tip of the column 27. An air cylinder 29 is supported by a plate 28 via a support shaft 30 at a base end thereof 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 turned 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 front end of the cover 32 extends to near the center of the roving guide groove 9, and a groove 32 a is formed at a position corresponding to the roving guide groove 9.

As shown in FIG. 9 and the like, at a position corresponding to the roving splicing head PH arranged at the standby position, a suction nozzle 33 as an outlet means is provided. Suction nozzle 3
Reference numeral 3 denotes a preliminary roving bobbin winding (full bobbin) F which is fixed to the tip of the suction pipe 34, detached from a preliminary roving bobbin winding rail (not shown), and supported on a full bobbin elevating / lowering device 35 so as to facilitate the discharging operation. Between the roving end suction position above the corresponding roving splicing head PH and the roving introduction position / standby position below the roving splicing head PH by a drive mechanism (not shown). ing. Suction pipe 34
Is connected to a cotton collecting box (both not shown) which generates a suction action by driving a blower as a suction source.
A peg 35a mounted on the full bobbin elevating device 35 is rotatable by a drive mechanism (not shown).

As shown in FIG. 7, the suction nozzle 33 is formed in two and fixed by screws 36. It may be formed integrally without dividing into two. A roving thread cutting member 37 is fixed to the outside of the suction nozzle 33 by a screw 38. The roving cutting member 37 includes a support plate 39 whose upper part is formed in a substantially triangular shape, and a comb 40 fixed at a position corresponding to the base of the triangle 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 portion 33a of the suction nozzle 33 so that the needle 40a can be locked to the roving when the roving moves relatively upward. The two hypotenuses of the triangular portion of the support plate 39 cause the roving to
A guide portion 39a for guiding the lower side of Oa is formed.
The material of the roving cutting member 37 is not particularly limited, such as metal, resin, and ceramics, but stainless steel is preferable in terms of rust prevention.

Next, the operation of the above-configured device will be described. In the case where the new roving yarn R whose roving end is drawn out from the full bobbin F is gripped by the roving yarn joining head PH, the roving yarn joining head PH is arranged downward at the standby position as shown in FIG. Reference numeral 23 denotes a standby position where the roving thread can freely enter into the depth of the roving guide groove 9. On the other hand, the full bobbin F is removed from the preliminary roving winding rail by the full bobbin elevating device 35, and is disposed at a position near the roving splicing head PH which is easy to discharge. In this state, the suction nozzle 33 is raised from the standby position (original position), and is disposed above the roving splicing head PH and at the roving end suction position close to the lower peripheral surface of the full bobbin F as shown in FIG. Is done. During or after the suction nozzle 33 is lifted, a suction force is applied to the suction nozzle 33 from the suction source via the suction pipe 34.

After the suction nozzle 33 is disposed at the roving end suction position and a suction force is applied to the suction nozzle 33, the peg 35a of the full bobbin elevating device 35 rotates one or more times in the direction in which the roving is fed out. Preferably, it is rotated about 1.5 times. During the rotation of the full bobbin F, the roving end is in a state corresponding to the inlet portion 33a of the suction nozzle 33, and at that time, the roving end is sucked by the suction nozzle 33. Full bobbin F is 1
After being rotated by a predetermined amount or more, 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 a direction in which the roving yarn is fed out, and the roving yarn is drawn out of the full bobbin F without being broken as the suction nozzle 33 moves downward. After the suction nozzle 33 moves down 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 a downward standby position shown by a chain line in FIG. 11 to be placed at a horizontal position shown by a solid line. At this time, since the gripping member 23 is located at the standby position, the new roving thread R is introduced to the depth of the roving thread guide groove 9 with the rotation of the roving thread splicing head PH. Then, the air cylinder 29 is operated in a state where the new roving yarn R is introduced to the depth of the roving yarn guiding groove 9, and the gripping member 23 is rotated together with the lever 24 by the protruding operation of the piston rod 29a. And FIG.
As shown in FIG. 8B and FIG.
The new roving thread R is disposed at a roving gripping position for pressing the new roving thread R, and the new roving thread R is gripped by the roving splicing head PH.

Next, the cutting action of the new roving yarn R will be described. As shown in FIGS. 12 to 16, the suction nozzle 33 is not on the extension of the roving guide groove 9 of the roving splicing head PH, but is at a slightly shifted position. When the suction nozzle 33 is moved up again from the original position while the end of the new roving yarn R gripped by the roving yarn splicing head PH is being sucked by the suction nozzle 33, FIGS. As shown in the figure, the guide portion 39a of the roving yarn cutting member 37 starts engaging with the new roving yarn R during the ascent, and the new roving yarn R slides down along the guide portion 39a as the suction nozzle 33 rises. Then, FIG.
As shown in (b), when the lower end of the guide portion 39a reaches a position above the lower end of the bulging portion 6a of the roving splicing head PH, the new roving yarn R is positioned directly opposite the needle 40a on one side of the comb 40. Be guided. 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 a position above the lower end of the bulging portion 6a, the lifting of the suction nozzle 33 is stopped. In addition, the suction nozzle 3
Since the new roving R does not engage with the needle 40a at the time of the ascent of 3, the new roving R does not loosen at the time of the ascent.

Next, the suction nozzle 33 is lowered, and the new roving R is engaged with the needle 40a of the comb 40 as shown in FIGS. One of the new roving yarns R is gripped by the roving yarn splicing head PH and the other is a suction nozzle 33.
, And the tension is applied, so that the locking by the needle 40a is reliably performed. When the suction nozzle 33 further descends from this state, the fiber of the new roving yarn R is drawn out between the gripping point by the roving splicing head PH and the comb 40 as shown in FIG. It is cut like a brush in the state. The cut roving on the suction nozzle 33 side is stored in a cotton collecting box (not shown) via the suction pipe 34 by the action of the suction airflow.

Next, as shown in FIG. 1, compressed air is injected from the pipe 20, and air is blown to the end of the cut new roving R. The pressure of the compressed air is approximately 3-5 atm and the injection time is 1-2 seconds. The fibers that are not gripped by the gripping member 23 are blown off by the air blown to the roving end. Therefore, the fiber having a length substantially equal to the fiber length remains before the gripping point by 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 ahead of the gripping point by the gripping member 23 due to the variation in tension acting on the new roving R. The length of the yarn R may vary. However, when the compressed air is blown to the roving end after the cutting of the new roving R by the action of the comb 40 as described above, the new roving R is surely almost the fiber length from the gripping point to the roving end. Length.

After the cutting of the new roving yarn R is completed, the support arm 2 is tilted toward the spinning frame base, and the roving splicing head PH is moved to the roving splicing operation position near the upper part of the draft part. While the roving splicing head PH moves to the roving splicing operation position, the old roving R1 being spun is introduced into the roving guide groove 9.
Since the gripping member 23 is located at the roving holding position, the old roving R1 is prevented from moving farther from the tip of the gripping member 23, and the old roving R1 is positioned at a position corresponding to the injection nozzle 12. Is held. After the roving splicing head PH is located at the roving splicing operation position, the control valve 17 is opened at the same position, and compressed air is injected from the injection 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 air current acts to pull the old roving R1 upward. Then, the old roving R1 is cut like a brush at a predetermined position where the jet air flow hits, with the single fiber coming off. The old roving R1 after the cutting is in a state of hanging down to the rear of the trumpet 8, as shown in FIG.

Next, compressed air having a pressure (approximately 0.6 to 1.2 atm) lower than the injection pressure at the time of cutting the new roving R is injected from the pipe 20. The pressure of the compressed air is adjusted to an appropriate pressure when cutting a new roving and an appropriate pressure when introducing a roving by a variable adjusting pressure reducing valve provided in the middle of the pipe 20. The compressed air becomes an airflow along the accommodation recess 18, and the end of the new roving R is kept straight by the action of the jet airflow.

The roving splicing head PH is rotated clockwise from the position shown in FIG. 18 while the compressed air injection is continued, and the roving splicing head PH is introduced into the trumpet 8 shown in FIG. Placed in the position. When the roving splicing head PH is arranged at the new roving end introduction position, the state in which the jet airflow from the pipe 20 guides the new roving end toward the outlet 8a of the trumpet 8 is maintained. Therefore, the new roving yarn R gripped by the gripping member 23 has its tip at the outlet 8 of the trumpet 8.
It is held in a state of extending straight toward a. Next, the air cylinder 29 is operated to release the gripping of the new roving R by the gripping member 23. Then, the new roving yarn 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 toward the back roller 7a (the state of FIG. 20). Then, the new roving R is supplied to the back roller 7a in a state of being superposed on the old roving R1, and the roving is spliced, 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 thread R is bitten by the back roller 7a.

Since the end of the new roving thread R is cut into a brush tip without cutting the single fiber, 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 a sudden increase in balloon size is eliminated. In addition, since the new roving yarn R is cut to a length substantially equal to the length of the fiber from the gripping point to the roving end, the balloon of the yarn spun from the front roller becomes excessively large, and is caught by the slab catcher. The length of the overlapping portion (roof joint) at the time of roving is not increased.

(Embodiment 2) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the configuration of the second injection nozzle provided in the roving splicing head PH is different from that of the above embodiment. That is, a groove 41 extending in parallel with the longitudinal direction of the head body 6 is provided below the position 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 guide groove 9. And a groove 42 extending downward is formed. An end 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. FIG. 21 (a)
As shown in the figure, the grooves 41 and 42 are formed on the plate
5 covered. Accordingly, when compressed air is supplied from the pipe 43 in the roving splicing head PH, a part of the supplied compressed air is injected from the tip end of the one groove 41 toward the front side of the roving splicing head PH, The rest is injected in the same direction as in the previous embodiment from the tip end of the other groove 42.

When the roving splicing operation is performed by using the roving splicing head PH of this embodiment in the same manner as in the previous embodiment, the roving yarn guiding groove 9 is formed.
When the old roving R1 is loosely sandwiched in the roving guide groove 9 even when the width of the old roving R1 is not sufficiently large with respect to the roving, the jet airflow from the groove 41 after the cutting of the old roving R1 is reduced. By the action, the old roving R1 is immediately and surely detached from 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 time can be shortened.

The present invention is not limited to the above embodiments. For example, instead of the pipe 20, the head body 6 may be grooved to form the second injection nozzle, or the roving guide groove may be formed. A configuration in which an air flow is injected from both sides with the 9 interposed therebetween may be adopted. 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 roving. Also, the comb 40 is formed from a large number of needles 40a.
Alternatively, the comb 40 may be formed of a thin plate having a serrated cut.

Instead of cutting the new roving thread R by the comb 40, a cutter is provided in the roving splicing head PH, and the new roving thread is set at a position where the length from the holding point by the holding member 23 is longer than the fiber length. After cutting R or cutting the new roving yarn R by another method, compressed air may be injected from the second injection nozzle. In addition, the ejection of the compressed air from the second ejection nozzle for blowing off 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, The roving splicing head PH may be moved while being moved to the roving splicing operation position or after the old roving R1 is cut. Further, the cutting of the old roving R1 is not limited to the method of the above-described embodiment using compressed air, but may be an appropriate method. In the case of spinning a fiber having a long fiber length, the gripping member 23 is disposed above 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 fiber protruding from the lower end of the splicing head PH may be a length that does not hinder the insertion into the trumpet 8. Further, the present invention may be applied to a device in which a roving splicing device is equipped with two roving splicing heads PH or three or more roving splicing heads and simultaneously performs a roving splicing operation of a plurality of weights. Further, the present invention is not limited to a roving splicing device that cuts an old roving R1 before inserting a new roving R into the trumpet 8, but is disclosed in Japanese Patent Application 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 a device.

[0037]

As described above in detail, according to the present invention, when the roving end is taken out from the preliminary roving winding, the new roving held by the roving splicing head is substantially removed from the gripping point by the roving splicing head. Since the length of the roving protruding from the roving splicing head is constant if the spinning conditions are the same, the roving end comes into contact with the trumpet wall surface during roving splicing. It is possible to reliably prevent the bent portion and the overlap portion (roof joint) with the old roving from becoming unnecessarily long, thereby improving the roving success rate.

[Brief description of the drawings]

FIG. 1 is a side view showing a state where 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 splicing head with the cover removed.

FIG. 4 is a partial plan view of the 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 line EE of FIG. 5B, FIG.
FIG. 3 is a sectional view taken along line FF of FIG.

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

FIG. 8A is a front view of a roving yarn cutting member, and FIG. 8B is a longitudinal sectional view of a leading end of a roving splicing head.

FIG. 9 is a side view showing a state where the full bobbin is arranged at the roving opening position and the suction nozzle and the roving splicing head are arranged at the standby position.

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

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

12A is a side view showing a positional relationship between a suction nozzle disposed at a roving introduction position and a roving splicing head, and FIG. 12B is a front view.

13A is a side view showing a state in which the suction nozzle has been raised to a position where a guide portion engages with a new roving, and FIG. 13B is a partially omitted arrow A view.

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

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

FIG. 16A is a side view showing a state in which the suction nozzle is raised to a position where the new roving is locked by the locking portion, and FIG. 16B is a partially omitted view taken in the direction of arrow D.

FIG. 17 is a side view showing a state where a new roving has been 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 splicing head is arranged at a new roving end introduction position.

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

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

FIG. 22A is a sectional view taken along line GG of FIG. 21A;
FIG. 22B is a sectional view taken along line HH of FIG.

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

[Explanation of symbols]

6 head body, 9 roving guide groove, 20 pipe, 23
... Grip member, 33 ... Suction nozzle that constitutes the outlet means,
37 roving cutting member, F ... full bobbin (preliminary roving winding), PH
... Rubber splicing head, R ... New roving, R1 ... Old roving.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-57957 (JP, A) JP-A-2-112426 (JP, A) JP-A-63-75126 (JP, A) JP-A 52-57926 5333 (JP, A) JP-A-5-195354 (JP, A) JP-B-47-51649 (JP, B1) JP-B-48-39054 (JP, Y1) (58) Fields investigated (Int. ⁷ , DB name) D01H 9/16 D01H 9/00-9/04 D01H 15/00

Claims (1)

(57) [Claims] A roving end of a roving winding is drawn out by a discharging means comprising a suction nozzle, and a roving is introduced into a roving guiding groove formed at a tip of a roving splicing head. Guide groove
While holding the roving yarn, connect the spouting means and the roving splicing head.
Suction noise is caused by relative movement in the near and away directions.
Is located outside the entrance of the
After locking the roving in the comb, cut the roving in such a state that the roving end hangs down from the roving guide groove of the roving splicing head.
A roving yarn cutting method in a roving yarn changer that blows gas toward an end of a roving yarn while holding a roving yarn introduced into a roving yarn guide groove by a gripping member and blows off fibers that are not gripped by the gripping member.