JP2882092B2 - Roving splicing method in spinning machine - 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. The present invention relates to a roving splicing method by a roving splicing device that performs a roving splicing (shino splicing) operation prior to a replacement operation by a roving yarn changing machine that performs a roving yarn changing operation.

[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 near empty, it is necessary to replace it with a new roving, and at that time, the roving end of the roving to be newly replaced with roving being spun. Needs to be spliced. Conventionally, this roving splicing operation has generally been performed manually, but in recent years, automation of the roving splicing operation has been proposed (for example, JP-A-62-57957).

[0003] The above publication discloses a roving (shino) formed at the tip end.
A roving holding member is provided on the main body on both sides of the guide groove, and a roving (new roving) of a full bobbin for connecting the roving is gripped by a roving holding lever that reciprocates across the roving guide groove. A roving splicing head is provided to hold the roving (old roving) of the kodama bobbin after the roving splicing, and the old roving is inserted into the roving guide groove with the roving splicing head gripping the new roving. Is introduced, the old roving and the new roving are superposed, and the superposed part is led to the back roller of the draft part as the old roving is fed, and the superposed part of the new roving and the old roving is gripped by the back roller. After that, a roving splicing method is disclosed in which an old roving is gripped and cut by a roving gripping member. However, in this conventional method, the new roving is guided by the old roving and introduced into the trumpet,
The overlapping section moves to the gripping position by the back roller at the peripheral speed of the back roller. Therefore, there is a problem that it takes time to complete the roving splicing. 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.

[0005]

Problems to be Solved by the Invention
In the roving splicing method disclosed in Japanese Patent Publication No. 6 and the like, since the end of the new roving held by the roving splicing head is positively inserted into the trumpet by the rotation of the roving splicing head, The time required for piecing is reduced. However, the end of the new roving held by the roving splicing head is not necessarily in a state of extending in a predetermined direction suitable for insertion into the trumpet. Even if the trumpet comes into contact with the inner wall of the trumpet and bends, the trumpet may be jammed or sent out from the outlet of the trumpet to the back roller side, and may be introduced into the roller part in a bent state. If the end of the new roving is introduced into the roller part in a bent state, the bent part cannot be gripped between the rollers in the roller part and passes through as an incomplete draft. The balloon becomes excessively large in the slab shape, and is caught by the slab catcher of the snell wire, and the thread breaks.

[0006] In addition, the trumpet normally performs a traverse motion in the axial direction of the draft roller with a width of 6 to 10 mm in order to extend the life of the rubber cot of the front roller.
The tip of the new roving abuts against the inner wall of the trumpet, and the tip of the roving may be bent due to the frictional resistance of the inner wall of the trumpet, thus causing the above-described inconvenience. The present invention has been made in view of the above problems, and an object of the present invention is to positively insert a new roving thread grasped by a roving splicing head into a trumpet, thereby reliably bending the tip of the new roving thread. It is an object of the present invention to provide a roving splicing method in a spinning machine which can prevent a new roving from being sent out from an outlet of a trumpet to a back roller in a straight state.

[0007]

In order to achieve the above object, according to the present invention, a roving splicing head having a roving yarn guiding groove formed at its tip grips a new roving yarn introduced into the roving yarn guiding groove. When the roving splicing head is placed at the new roving end introduction position to the trumpet, the airflow that guides the new roving end gripped by the gripping member from the inlet to the outlet of the trumpet. An injection unit for injecting the new roving is introduced, and after the new roving introduced into the roving guide groove is gripped by a gripping member, gas is injected from the injection unit, and in this state, the roving splicing head is connected to the new roving to the trumpet. At the end introduction position, the gripping member releases the gripping of the new roving in a state where a part of the new roving is inserted into the trumpet, and the gas injection is continued for an appropriate time after the gripping of the new roving is released. I did it.

[0008]

The roving splicing head grips the new roving introduced in the roving guide groove formed at the tip thereof with a gripping member, and then injects gas from an injection section. At this time, the floating fiber at the end of the new roving which is not gripped by the gripping member is blown off by the airflow,
The length from the gripping member to the end of the new roving becomes constant, and the new roving on the tip side of the gripping portion is held in a state of extending along the airflow. Next, the roving splicing head is arranged at the position where the new roving end is introduced into the trumpet, and the new roving end is inserted into the trumpet. In this state, since the jetting section is located at a position where the jet airflow guides the end of the new roving toward the outlet of the trumpet, the traverse motion of the trumpet causes the tip of the new roving to hit the inner wall of the trumpet. Even if it touches, the new roving end is kept straight by the action of the jet airflow. Next, when the gripping of the new roving yarn by the gripping member is released, the end of the new roving yarn is pushed out from the outlet of the trumpet toward the back roller by the action of the jet airflow. Gas injection is continued until the tip of the new roving thread exits from the outlet of the trumpet toward the back roller. Therefore, even if the leading end of the new roving is in contact with the inner wall of the trumpet, it passes through the trumpet without being bent, and is supplied to the back roller in a straight state. The cutting of the old roving is generally performed before the insertion of the new roving into the trumpet, but the cutting of the old roving may be performed after the insertion of the new roving into the trumpet.

[0009]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The roving splicer 1 is mounted on a roving changer (not shown) that moves along the spinning frame and performs roving change work. As shown in FIG. 1, the roving splicing head 2 is rotatably supported at the tip of a support arm 3 of the roving splicing device 1. The support arm 3 positions the roving splicing head 2 at a roving splicing position above the draft part and at a retracting position that does not hinder the movement of the roving yarn changer. Thus, it is fixed at the base end of the support arm 3 so as to be integrally rotatable. At the tip of the support arm 3, as shown in FIG.
a is formed, and the rotating shaft 5 is supported so as to protrude to the side of the mounting portion 3a. At a position corresponding to the inside of the mounting portion 3a of the rotating shaft 5, a toothed pulley 6a is fitted and fixed so as to be integrally rotatable, and is attached to the toothed pulley 6a and a drive shaft of a motor 7 fixed to the base end of the support arm 3. Toothed pulley 6 fitted
b, a toothed belt 8 is wound. The roving splicing head 2 is fixed to the rotating shaft 5 at a portion protruding to the side of the mounting portion 3a so as to be integrally rotatable. It is configured to be rotated to a position approaching the trumpet 9.

A bulging portion 10a having a slope inclined downward toward the rear is provided at the tip of the head body 10 of the roving splicing head 2.
Are formed. A roving guide groove 11 is formed at the tip of the head body 10 so as to extend in the longitudinal direction and the vertical direction of the head body 10. Notches 12 communicating with the roving yarn guide groove 11 to open the roving yarn guiding groove 11 to the rear and side of the bulging portion 10a. 13 are formed respectively. As shown in FIGS. 3 and 4, the notches 12 and 13 are formed at positions displaced in the vertical direction, and one notch 1 located on the upper side is formed.
2 is formed longer than the other cutout 13 located on the lower side.

A pair of support pins 14, 15 are rotatably mounted on the head body 10 behind the bulging portion 10a so as to protrude from the upper and lower sides of the head body 10.
A first catcher 16 as an old roving grasping member is attached to the lower end of one of the support pins 14 so as to be integrally rotatable at a base end thereof, and a lever 17 is extended at the upper end along the longitudinal direction of the head body 10. One end thereof is fixed so as to be integrally rotatable. The tip of the first catcher 16 is inserted into the one notch 12 and the support pin 14
The rotatable rotation causes the gripping portion 16a to enter the roving yarn guide groove 11 and cooperate with one wall surface 11a of the roving yarn guiding groove 11 to grip the roving yarn. Guide groove 1
1 and is movably disposed to a standby position where the roving yarn is allowed to move within the roving yarn guiding groove 11 while being retracted from the inside.

A second catcher 18 as a new roving grasping member is attached to the lower end of the other support pin 15 so as to be integrally rotatable at its base end, and a lever 19 is provided at the upper end along the longitudinal direction of the head main body 10. In an extended state, it is integrally rotatably fixed at one end. 2nd catcher 1
8 is formed shorter than the first catcher 16, the tip of which is inserted into the other cutout 13, and
With the rotation of 5, the gripping portion 18a enters the roving yarn guide groove 11 and cooperates with the other wall surface 11b of the roving yarn guiding groove 11 to grip the roving yarn. It is movably disposed so as to be retracted from the yarn guide groove 11 and to a standby position where the roving yarn can be moved in the roving yarn guide groove 11. or,
A regulating member 18b is fixed to the tip of the second catcher 18. The regulating member 18b is formed of a wire, is fixed in a state of extending below the bulging portion 10a, and
When the catcher 18 is located at the roving grasping position, the catcher 18 is located at a regulating position that intersects with the roving guide groove 11.

A support block 20 is fixed in the vicinity of the support arm 3 of the rotary shaft 5 so as to be integrally rotatable, and a support plate 21 is fixed between the support block 20 and a base upper surface of the head body 10. At one end of the support plate 21 (close to the support arm 3), a column 22 is erected, and a plate 23 is fixed to the tip of the column 22. A pair of air cylinders 24 and 25 as a driving device are supported by a plate 23 at a base end thereof via a support shaft 26 so as to extend in a direction orthogonal to the head main body 10. One air cylinder 24 has a piston rod 24 a rotatably connected to the other end of the lever 17 via a pin 27. The other air cylinder 25 has its piston rod 2
5 a is rotatably connected to the other end of the lever 19 via a pin 27. And the air cylinders 24, 2
By the operation of 5, the first catcher 16 and the second catcher 18 are rotated via levers 17 and 19. The roving splicing head 2 has levers 17, 1
9 and a cover 28 that covers the air cylinders 24 and 25 are attached to a mounting member (not shown) fixed to the support plate 21.
The top end of the cover 28 extends to near the base end of the roving guide groove 11.

As shown in FIG. 3, the head body 10 has a block 29 having a cutout portion 12 for accommodating the first catcher 16 and is formed separately.
0 are integrally fixed. As shown in FIGS. 3 to 6, the block 29 has a recess 31 for accommodating a pipe 30 constituting an injection unit for injecting a compressed air flow.
Is formed at a position opposing the base end of the roving yarn guide groove 11, and at a position corresponding to the upper side of the housing recess 31, the pipe 30 housed in the housing recess 31 is held and a new roving yarn R <b> 2 is provided. Flat recess 3 into which a pressing plate 32 for gripping is fitted.
3 are formed. The pressing plate 32 is fitted in the recess 33 in a state of being flush with the wall surface 11b. Also, FIG.
As shown in FIG. 5, the pipe 30 is housed in the housing recess 31 with its tip being lower than the second catcher 16 and at a predetermined distance from the lower end of the housing recess 31. The pipe 30 is connected to a compressed air source (not shown) such as a compressor through a known variable pressure reducing valve.

As shown in FIG. 7, the outlet 9a of the trumpet 9 is formed to be vertically long so that the new roving R2 can sufficiently pass while the old roving R1 being spun exists. Next, a roving splicing method using the device configured as described above will be described. As shown in FIGS. 2 and 8, when the piston rod 24a is located at the projecting position, the first catcher 16 is located at the standby position where the gripping portion 16a is retracted from the roving guide groove 11, as shown in FIG. As the piston rod 24
In the state where a is located at the immersion position, the gripping portion 16a is arranged at the roving grasping position where the roving can be grasped in cooperation with one wall surface 11a of the roving guiding groove 11. When the piston rod 25a is located at the retracted position as shown in FIG. 2, the second catcher 18 is located at the standby position where the grip portion 18a is retracted from the roving guide groove 11, and FIGS.
In the state where the piston rod 25a is located at the protruding position as shown in (1), the grip portion 18a cooperates with the other wall surface 11b of the roving yarn guide groove 11 and is located at the roving yarn holding position where the roving yarn can be gripped. .

When gripping the new roving yarn R2 drawn from the full bobbin, as shown in FIG.
And the second catcher 18 is arranged at the standby position, and the new roving thread R2 is introduced into the roving thread guide groove 11 in a state where the roving thread can freely enter into the roving thread guiding groove 11. New roving yarn R
The other air cylinder 25 is operated in a state where 2 is introduced to the depth of the roving guide groove 11, and the second catcher 18 is rotated counterclockwise in FIG. 2 together with the lever 19 by the projection operation of the piston rod 25a. . Then, as shown in FIG. 8, the grip portion 18 a is the other wall surface 1 of the roving yarn guide groove 11.
The new roving thread R2 is disposed at a roving thread gripping position in contact with the other roving thread 1b and cooperates with the other wall surface 11b. New roving yarn R2
Is gripped by being pushed into the other wall surface 11b by the gripping portion 18a of the second catcher 18 in a state where it is introduced into the depth of the roving yarn guide groove 11, so that it is gripped by the second catcher 18. Hardly move to
The tip position of the new roving thread R2 is stabilized.

The gripping of the new roving R2 is performed at a position away from the draft part on the front side of the spinning frame. After the gripping of the new roving R2, the support arm 3 is rotated by the drive shaft 4 to rotate the spinning frame. It is tilted toward the machine base, and the roving splicing head 2 is moved and arranged to a roving splicing work position near and above the draft part. Since the cover 28 exists above the head main body 10, the new roving yarn R2 connected to the full bobbin when the roving splicing head 2 is moved can be reliably prevented from being bent or caught on the levers 17, 19 or the like.

When the roving splicing head 2 is moved to the roving splicing operation position, the old roving R1 being spun is introduced into the roving guiding groove 11 as shown in FIG. In a state where the second catcher 18 is disposed at the roving grasping position, the old roving R1 is prevented from moving to the far side from the regulating member 18b, and the old roving R1 is prevented.
Is held at a position where the catching action of the first catcher 16 is received. After the roving splicing head 2 is disposed at the roving splicing operation position, one of the air cylinders 24 is operated at the same position, and the piston rod 24a is immersed. As a result, the first catcher 16 is rotated together with the lever 17 in the clockwise direction in FIG. 8, and the grip portion 16a presses the old roving R1 against one wall surface 11a of the roving yarn guiding groove 11 as shown in FIG. It is disposed at the yarn gripping position and grips the old roving R1 in cooperation with the one wall surface 11a.

Next, the motor 7 is driven to drive the roving splicing head 2
Is rotated counterclockwise in FIG. 10 around the rotation shaft 5, and the old roving R1 is cut between the roving splicing head 2 and the trumpet 9 as shown in FIG. Then, the old roving R1 connected to the draft part hangs down to the rear of the trumpet 9 by its own weight as shown in FIG. Next, one of the air cylinders 24 is operated to place the first catcher 16 at the standby position, and the gripping of the old roving R1 by the first catcher 16 is released. After cutting the old roving R1, compressed air having a pressure of 0.3 to 1.0 kg / cm ² is injected from the pipe 30. The compressed air becomes an airflow along the accommodation recess 31, and the end of the new roving R2 is held in a straight state by the action of the jet airflow. At this time, the floating fiber at the end of the new roving R2 that is not gripped by the second catcher 18 is blown off by the airflow, and the length from the second catcher 18 to the end of the new roving R2 becomes constant. The injection pressure is adjusted to an appropriate value according to the type and thickness of the fiber.

The motor 7 is driven in the reverse direction while the injection of the compressed air is continued, and the roving splicing head 2 is rotated clockwise from the position shown in FIG. 11, and the roving splicing head 2 is moved to the trumpet 9 shown in FIG. At the new roving end introduction position. In a state where the roving splicing head 2 is arranged at the new roving end introduction position,
The jet stream from the pipe 30 makes the new roving end trumpet 9
Is held in a state of being guided toward the exit 9a. Accordingly, the new roving thread R2 gripped by the second catcher 18 is also held in a state where its tip is straightened toward the outlet 9a of the trumpet 9. Then the other air cylinder 2
5 is operated to release the gripping of the new roving thread R2 by the second catcher 18. When the gripping by the second catcher 18 is released, the new roving R2 is moved toward the outlet 9a of the trumpet 9 by the action of the jet airflow, and is pushed out from the outlet 9a toward the back roller 34. And new roving R
No. 2 is supplied to the back roller 34 in a state of being superposed on the old roving R1, and roving is spliced, and thereafter, spinning is continued by the new roving R2. The injection of the compressed air from the pipe 30 is stopped when the tip of the new roving R2 is bitten by the back roller 34.

After the roving splicing head 2 is arranged at the new roving end introduction position as described above, the new roving R2 is moved from the pipe 30 until the leading end of the new roving R2 is bitten by the back roller 34.
Exists toward the outlet 9a of the trumpet 9, so that the traverse motion of the trumpet 9 causes the new roving thread R2 to pass through the trumpet 9 without being bent even if it comes into contact with the inner wall of the trumpet 9. Is supplied to the back roller 34 in a straight state, and the success rate of roving splicing is improved. In addition, the old roving R1 that is cut before the new roving R2 is introduced into the trumpet 9 and that hangs down from the trumpet 9 has a large mass, so that its position does not fluctuate due to the jet flow.

In this embodiment, the gripping position of the new roving R2 and the gripping position of the old roving R1 are separated not only in the vertical direction but also in the longitudinal direction of the roving guide groove 11, so that the old roving When cutting R1, there is no possibility that the old roving R1 is entangled with the new roving R2. (Embodiment 2) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the configuration of an injection unit for injecting an airflow for guiding a new roving end provided in a roving splicing head 2 toward an outlet of a trumpet is different from that of the above-described embodiment. That is, the block 29 has a groove 35 extending parallel to the longitudinal direction of the head main body 10 at a position below the notch 12.
And a groove 36 communicating with the groove 35 and extending downward at a position facing the base end of the roving yarn guiding groove 11. An end of a pipe 37 connected to a compressed air source is connected to a base end of the groove 35 via a hose joint 38. Further, as shown in FIG.
6 is covered with a plate 39 except for the tip side. Therefore, when the compressed air is supplied from the pipe 37 in the roving splicing head 2, a part of the supplied compressed air is supplied to the one groove 3.
5 is injected toward the front side of the roving yarn splicing head 2 and the remainder is injected from the other end of the groove 36 in the same direction as in the above embodiment.

When the roving splicing operation is performed using the roving splicing head 2 of this embodiment in the same manner as in the previous embodiment, the roving yarn guiding groove 11 is formed.
Even when the width of the roving does not have enough room for the roving and the roving is loosely caught in the roving guiding groove 11, the action of the jet air flow from the groove 35 after the cutting of the old roving R1. As a result, the old roving R1 is immediately and surely detached from the roving guide groove 11 and hangs behind the trumpet 9. Therefore, immediately after cutting the old roving R1, the new roving R
2 can be inserted into the trumpet 9 and the roving time can be shortened.

The present invention is not limited to the above embodiments. For example, the regulating member 18b of the second catcher 18 may be omitted, or the pipe 30 may have an elliptical or rectangular cross section in the first embodiment. A shape other than a circular shape may be used, or a groove may be formed in the head body 10 in place of the pipe 30 to form a compressed air injection portion, or an air flow may be injected from both sides with the roving guide groove 11 interposed therebetween. Alternatively, a configuration may be adopted. In the above embodiment, after cutting the old roving R1, the end of the new roving R2 is trumpet 9 cut.
The roving splicing method of inserting a new roving yarn R2 into a trumpet before cutting the old roving yarn R1 as in the method disclosed in JP-A-62-57957 has been described. 9 and then cut into the old roving R1. Even in that case, new roving yarn R
2 is positively supplied to the trumpet 9 and the back roller 34 by the rotation of the roving splicing head 2 and the action of the jet airflow, so that the roving splicing operation time is shortened. In the above-described embodiment, the roving splicing device 1 is provided with one roving splicing head 2. However, the roving splicing device 1 is equipped with two roving splicing heads 2 or three or more roving splicing heads. A roving splicing operation of a plurality of weights may be performed. Further, the first catcher 1 is used to cut the old roving R1.
A method may be employed in which compressed air is blown onto the old roving R2 introduced into the roving guide groove 11 to cut it without using the gripping action of No. 6. Further, the present invention can also be applied to a case where after the roving yarn being spun is completely used, such as when changing varieties, a new roving end is supplied to the back roller via the trumpet.

[0025]

As described above in detail, according to the present invention, the new roving yarn is guided from the trumpet to the back roller in a shorter time by utilizing the entanglement between fibers with the old roving yarn. The splicing can be performed, and the floating fiber at the end of the new roving yarn that is not gripped by the gripping member is blown off by the action of the jet airflow from the injection unit, and the length from the gripping member to the new roving yarn end is reduced. When the new roving held by the roving splicing head is positively inserted into the trumpet, the bend at the tip of the new roving is reliably prevented, and the outlet of the trumpet is straightened. From the roller to the back roller, the roving success rate is increased.

[Brief description of the drawings]

FIG. 1 is a side view of a roving splicing device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the roving splicing head with the cover removed.

FIG. 3 is a partial perspective view of a roving splicing head.

4A is an enlarged sectional view taken along line AA of FIG. 1, FIG. 4B is an enlarged sectional view taken along line BB of FIG. 1, FIG. 4C is an enlarged sectional view taken along line CC of FIG. (d) is a sectional view taken along line DD of (a).

FIG. 5 is a side view of the block.

6A is a sectional view taken along line EE of FIG. 5, and FIG. 6B is a sectional view of FIG.
FIG. 4 is a sectional view taken along line FF of FIG.

FIG. 7 is a sectional view of a trumpet.

FIG. 8 is a plan view showing a state where the second catcher is arranged at a gripping position.

FIG. 9 is a plan view showing a state where both catchers are arranged at gripping positions.

FIG. 10 is a side view showing a state in which old roving is introduced into the roving guide groove.

FIG. 11 is a side view showing a cutting state of old roving.

FIG. 12 is a side view showing a state in which the roving splicing head is arranged at a new roving end introduction position.

FIG. 13 is a side view showing a state where a new roving end is inserted into a trumpet outlet.

FIG. 14A is a side view showing a block of a roving splicing head according to a second embodiment, and FIG. 14B is a front view thereof.

FIG. 15A is a sectional view taken along line GG of FIG. 14A;
FIG. 15B is a sectional view taken along line HH of FIG.

[Explanation of symbols]

2 ... roving splicing head, 9 ... trumpet, 9a ... exit, 1
Reference numeral 0: head body, 11: roving guide groove, 18: second catcher as a gripping member, 30: pipe forming an injection section, 35, 36: groove forming an injection section, 39: plate forming an injection section , R1: old roving, R2: new roving.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yoshihiro Tange 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (56) References JP-A-2-112426 (JP, A) 2-61974 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D01H 15/00 B65H 67/04 B65H 67/08

Claims (1)

(57) [Claims] 1. A roving splicing head having a roving yarn guiding groove formed at a tip thereof, a gripping member for gripping a new roving yarn introduced into the roving yarn guiding groove, and a roving yarn splicing head being a new roving yarn to a trumpet. An injection unit for injecting an airflow that guides a new roving end gripped by the gripping member when placed at the end introduction position from the inlet to the outlet of the trumpet, and is introduced into the roving guide groove. After the new roving is gripped by the gripping member, gas is injected from the injection section, and in this state, the roving splicing head is disposed at the new roving end introduction position to the trumpet, and a part of the new roving is in the trumpet. A roving yarn joining method in a spinning machine in which the gripping member releases the gripping of the new roving in a state where it is inserted in the spinning machine, and the gas is continuously injected for an appropriate time after the gripping of the new roving.