JP3077346B2 - Roving yarn cutting device 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. Prior to the replacement operation by the roving yarn changing machine, the roving end pulled out from the full bobbin at the time of performing the roving splicing (shino splicing) operation is surely made to a predetermined length and the tip thereof is BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roving yarn cutting device in a roving yarn changing machine capable of cutting into a shape.

[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.

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 is disclosed in Japanese Patent Application Laid-Open No. 62-57957. After sucking the roving end from the preliminary roving winding surface with the suction pipe mounted on the machine and discharging the roving end, the suction pipe is moved below the roving splicing head located downward while sucking the roving end. The roving yarn is guided to the holding portion, and in this state, the roving yarn is gripped by the holding portion, and then the roving splicing head is rotated upward to cut the roving yarn.

In Japanese Unexamined Patent Publication No. Hei 2-112426, a suction nozzle provided in a roving yarn changer sucks a roving end from a surface of a preliminary roving winding and discharges the roving end. Is moved downward to 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 into the gripping portion and grip the roving yarn. After the roving is gripped by the section, the roving splicing head is reciprocated in the vertical direction to cut the roving.

[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 while the new roving R is being sucked by the suction pipe 60, the new roving R
Is pulled out of the suction pipe 60. 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. Although it is necessary to receive a tension equal to or greater than the value, the new roving yarn R may be broken in the suction pipe 60 and the length downstream of the comb 61 may be shortened, so that 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 comes into contact with the inner wall of the trumpet when inserted into the trumpet, causing bending. 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 roller part in a bent state. If the tip 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 it passes as an incomplete draft,
The yarn spun from the front roller has a slab shape, 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, and the slab catcher becomes too large. 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 be able to reliably cut a new roving thread gripped by a roving splicing head into a length that does not hinder roving splicing. An object of the present invention is to provide a roving yarn cutting device in a roving yarn changing machine.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, a roving yarn guide groove is formed at a tip and a new roving yarn introduced into the roving yarn guiding groove is formed. Outside the suction means provided movably between a roving end suction position above the roving splicing head having a gripping member to be gripped and a roving introduction position below the roving splicing head, from the inlet. Above, there is provided a locking portion which can be locked to the roving when the roving moves relatively upward. Above the locking portion, the roving is moved below the locking portion when the suction means rises. A guide portion that can be guided to the side is provided.

Further, in the invention according to the second aspect, in addition to the above configuration, a second locking portion capable of locking with the roving is provided above the entrance in the suction means.

[0014]

The suction means is arranged at the roving end suction position above the roving splicing head, sucks the roving end from the surface of the preliminary roving winding, discharges the roving end, and sucks the roving end while sucking the roving end. It is moved to below the head. Then, after the middle of the roving from the preliminary roving winding to the suction means is gripped by the gripping portion of the roving splicing head, the suction means is raised, and the roving is guided to the lower side of the locking portion when it rises. Next, the suction means is lowered, and the roving tries to move upward relative to the suction means. At this time, the roving is locked by the locking portion, and the roving is partially pulled by the roving splicing head and partially pulled by the locking portion to be pulled by the roving splicing head and the suction pipe. Disconnected between.
After the engaging portion is moved to the vicinity of the roving gripping portion of the roving splicing head, the roving yarn is pulled down near the gripping point of the roving splicing head because it is lowered, and the length from the gripping point to the roving end is measured. Is cut so as to have a length substantially equal to the length of the fiber, and has a uniform length.

According to the second aspect of the present invention, the roving sucked in the roving is cut off because the suction action of the suction means is too strong, and the tension acting on the roving is reduced. Even in this case, when the roving yarn is to be moved in a direction in which the roving yarn is pulled out from the suction means, the second locking portion locks the roving yarn and a predetermined tension is applied to the roving yarn. As a result, the roving is reliably locked to the first locking portion, and the roving is cut so that the length from the gripping point to the roving end is substantially equal to the fiber length, and has a uniform length. .

[0016]

【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 (see FIG. 5).
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. 3 and 4, 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. 4, 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 so as to be integrally rotatable at a position corresponding to the inside of the mounting portion 2 a of the rotating shaft 3, 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 spun portion 6a guides the roving to the draft part 7. The trumpet 8 (both shown in FIG. 14) is formed in a shape that can enter the trumpet 8. 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 has a block 11 having the notch 10 formed separately, and is integrally fixed to the head body 6 with screws (not shown) or the like. As shown in FIG. 2 (b), the block 11 has a flat recess 13 which constitutes an injection nozzle 12 for injecting a compressed air flow, at a position above the notch 10 and in front of the notch 10 and above the roving yarn. The guide groove 9 is formed in an open state, and the roving guide groove 9 is covered by the plate 14. The plate 14 is fixed so as to be flush with 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.

A support pin 18 is rotatably mounted on the head main body 6 behind the bulging portion 6a so as to protrude from the upper and lower sides of the head main body 6. A gripping member 19 for gripping the new roving thread R2 is attached to the lower end of the support pin 18 so as to be integrally rotatable at its base end, and a lever 20 is extended at the upper end at one end thereof in a state extending along the longitudinal direction of the head main body 6. It is fixed so as to be integrally rotatable. The tip of the gripping member 19 is inserted into the notch 10 and the support pin 18
By the rotation of, the gripping portion 19a enters the roving yarn guide groove 9 and cooperates with one wall surface 9a of the roving yarn guiding groove 9 to grip the new roving yarn R2. Roving yarn guide groove 9
It is movably disposed so as to be retracted from the inside and to a standby position in which the movement of the roving in the roving guide groove 9 is permitted.

A support block 21 is fixed in the vicinity of the support arm 2 of the rotating shaft 3 so as to be integrally rotatable, and a support plate 22 is fixed between the support block 21 and the upper surface of the base end of the head body 6. At one end of the support plate 22 (closer to the support arm 2), a column 23 is erected, and a plate 24 is fixed to the tip of the column 23. An air cylinder 25 is supported by a plate 24 via a support shaft 26 at a base end thereof so as to extend in a direction orthogonal to the head body 6. The air cylinder 25 has a piston rod 25a.
Is rotatably connected to the other end of the lever 20 via a pin 27. The gripping member 19 is turned via the lever 20 by the operation of the air cylinder 25. A cover 28 that covers the lever 20 and the air cylinder 25 is attached to the roving splicing head PH via an attachment member (not shown) fixed to the support plate 22. The front end of the cover 28 extends to near the center of the roving guide groove 9, and a groove 28 a is formed at a position corresponding to the roving guide groove 9.

As shown in FIG. 5 and the like, a suction nozzle 29 as suction means is disposed at a position corresponding to the roving splicing head PH disposed at the standby position. Suction nozzle 29
The auxiliary roving winding (full bobbin) F fixed to the end of the suction pipe 30 and detached from the auxiliary roving winding rail (not shown) and supported on the full bobbin elevating device 31 to facilitate the tapping operation. It is provided movably between a roving end suction position above the corresponding 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). I have. The suction pipe 30 is connected to a cotton collecting box (both not shown) that generates a suction action by driving a blower as a suction source. The peg 31a mounted on the full bobbin lifting device 31 is rotatable by a drive mechanism (not shown).

As shown in FIG. 1, the suction nozzle 29 is formed in two and fixed by screws 32. It may be formed integrally without dividing into two. A roving thread cutting member 33 is fastened and fixed to the outside of the suction nozzle 29 by a screw 34. The roving cutting member 33 includes a support plate 35 having an upper part formed in a substantially triangular shape, and a comb 36 fixed at a position corresponding to the base of the triangle with the needle 36a facing downward. The comb 36 is formed by fixing a large number of needles 36a to a thin plate. The roving yarn cutting member 33 has a needle 36 as an engagement portion which can be engaged with the roving yarn when the roving yarn relatively moves upward, above the inlet portion 29a of the suction nozzle 29.
It is fixed so that a is located. The two oblique sides of the triangular portion of the support plate 35 are guide portions 35a that can guide the roving yarn to the lower side of the needle 36a when the suction nozzle 29 is raised.
Is composed. The material of the roving cutting member 33 is not particularly limited, such as metal, resin, and ceramics, but stainless steel is preferable from the viewpoint of rust prevention. In this embodiment, since the roving cutting member 33 is attached to the suction nozzle 29 with the screw 34, when the roving cutting member 33 needs to be replaced due to breakage of the needle 36a or the like, the roving cutting member 33 is removed. The work is easier than in the case where the suction nozzle 29 is fixed to the suction nozzle 29 by welding, brazing, bonding or the like.

Next, the operation of the above-configured device will be described. When gripping the new roving yarn R with the roving end discharged from the full bobbin F by the roving splicing head PH, the roving splicing head PH is arranged downward at the standby position as shown in FIG. Reference numeral 19 denotes a standby position where the roving thread can freely enter into the roving guide groove 9. On the other hand, the full bobbin F is detached from the preliminary roving winding rail by the full bobbin lifting / lowering device 31, and is arranged at a position near the roving splicing head PH which is easy to discharge. In this state, the suction nozzle 29 is raised from the standby position (original position), and is disposed above the roving splicing head PH and close to the lower peripheral surface of the full bobbin F, as shown in FIG. Is done. While the suction nozzle 29 is being lifted or after the lifting is completed, a suction force is applied to the suction nozzle 29 from the suction source via the suction pipe 30.

After the suction nozzle 29 is arranged at the roving end suction position and the suction force is applied to the suction nozzle 29, the peg 31a of the full bobbin elevating device 31 makes one or more rotations 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 29a of the suction nozzle 29, and the roving end is sucked by the suction nozzle 29 at that time. Full bobbin F is 1
After being rotated by a predetermined amount or more, the suction nozzle 29 is lowered. At this time, the full bobbin F is rotated at a speed corresponding to the descending speed of the suction nozzle 29 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 29 moves downward. After the suction nozzle 29 is lowered to the original position, the rotation of the peg 31a is stopped, and the state shown in FIG. 7 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. 7 to be placed at a horizontal position shown by a solid line. At this time, since the gripping member 19 is located at the standby position, the new roving yarn R is introduced deep into the roving yarn guide groove 9 with the rotation of the roving yarn joining head PH. Then, the air cylinder 25 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 19 is rotated together with the lever 20 by the protruding operation of the piston rod 25a. And FIG.
(B) and as shown in FIG. 4, the gripping portion 19a is disposed at the roving gripping position for pressing the new roving R against the other wall surface 9a of the roving guiding groove 9, and the new roving R is moved to the roving splicing head PH. Is gripped.

Next, the cutting action of the new roving yarn R will be described. As shown in FIGS. 8 to 12, the suction nozzle 29 is not on an extension of the roving guide groove 9 of the roving splicing head PH, but is at a slightly shifted position. When the suction nozzle 29 is moved up again from the original position while the end of the new roving yarn R gripped by the roving yarn joining head PH is being suctioned by the suction nozzle 29, FIGS. As shown in the figure, the guide portion 35a of the roving cutting member 33 starts engaging with the new roving R during the ascent, and the new roving R slides down along the guide portion 35a as the suction nozzle 29 rises. Then, FIG.
As shown in (b), when the lower end of the guide portion 35a reaches a position above the lower end of the bulging portion 6a of the roving splicing head PH, the new roving yarn R is guided to a position facing the needle 36a on one side of the comb 36. Is done. The suction nozzle 29 is further raised from the state shown in FIGS. 10 (a) and (b), and FIG. 11 (a) and (b)
As shown in (5), when the upper end of the inlet portion 29a of the suction nozzle 29 reaches a position above the lower end of the bulging portion 6a, the lifting of the suction nozzle 29 is stopped. When the suction nozzle 29 is raised, the new roving R does not engage with the needle 36a, so that the new roving R does not slack when raised.

Next, the suction nozzle 29 is lowered, and the new roving R is engaged with the needle 36a of the comb 36 as shown in FIGS. One of the new roving yarns R is gripped by the roving yarn joining head PH, and the other is a suction nozzle 29.
, And the tension is applied, so that the needle 36a is securely locked. Then, when the suction nozzle 29 further descends from this state, the fiber of the new roving R is drawn out between the gripping point by the roving splicing head PH and the comb 36 by the action of the comb 36 as shown in FIG. Disconnected in the state. Since the new roving R is pulled out near the gripping point, the length from the gripping point to the roving end becomes approximately the length of the fiber and is reliably cut into a brush tip shape. The roving on the suction nozzle 29 side after the cutting is housed in a cotton collecting box (not shown) via the suction pipe 30 by the action of the suction airflow.

After cutting the new roving yarn R, the roving splicing head P
H is rotated clockwise, the suction nozzle 29 is raised again,
The end of the new roving R may be sucked by repeating descending. or,
In the apparatus of this embodiment, since the guide portion 35a and the comb 36 are provided on both the left and right sides of the center line of the suction nozzle 29, the new roving R is always guided to the lower side of the comb 36 when the suction nozzle 29 is raised. Is done.

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 19 is located at the roving holding position, the old roving R1 is prevented from moving farther from the tip of the gripping member 19, 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, the motor is driven to drive the roving splicing head PH.
Is rotated clockwise from the position in FIG. 14, and the end of the new roving thread R is inserted into the trumpet 8. When the end of the new roving thread R is supplied to the back roller 7a of the draft part 7, the air cylinder 25 is operated, and the gripping of the new roving thread R by the gripping member 19 is released. And the new roving R is the old roving R
The roving splicing is performed by passing through the back roller 7a in a state where the roving yarn is superimposed on 1, and thereafter, the spinning with the new roving yarn R is continued. Since the end of the new roving R is cut like a brush tip without cutting the single fiber, it passes through the draft part 7 while being drafted between the front and rear rollers, and the slab yarn at the cutting portion of the new roving R There is no occurrence of thread breakage due to the sudden increase in size of the balloon. 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 structure of the roving cutting member 33 is different from that of the above-described embodiment. As shown in FIG. 16, the roving yarn cutting member 33 is formed in a substantially triangular shape in front, and has a pair of support plates 35 each having a hypotenuse serving as a guide portion 35a, and a comb including a number of needles 36a constituting a first locking portion. 36
And a second needle 37 forming a second locking portion. The second needle 37 also serves as a mounting portion for mounting the roving cutting member 33 to the suction nozzle 29.
The upper portion 7 is fixed in a state of being sandwiched between a pair of support plates 35. A second needle 3 is located near the tip of the second needle 37.
In order to prevent the 7 from excessively biting into the new roving thread R, a thin plate 37a which also serves to integrate the plurality of second needles 37 is fixed.

As shown in FIG. 15, the roving cutting member 33 is provided with a second needle 37 above the inlet 29a in the suction nozzle 29.
Are fixed by screws 34 in a state where they protrude. Second
When the suction nozzle 29 rises, the amount of protrusion of the needle 37
The value is set so that the new roving R is not lifted by overcoming the suction force of the suction nozzle 29 even if the engagement is performed.

In the apparatus of the above embodiment, when the suction nozzle 29 is lowered from the state shown in FIGS.
In order to reliably lock the new roving thread R, it is necessary that the new roving thread R is in a state where a tension equal to or more than a certain value is applied by the suction action. Then, in order to add necessary tension to the new roving R, the new roving R sucked by the suction nozzle 29 and receiving the suction action needs to have a certain length or more. On the other hand, when sucking the roving end from the full bobbin F, even if the roving end is strongly pressed against the roving wound around the full bobbin F, the roving end is reliably sucked.
Alternatively, in order to secure the suction force even when the suction force is reduced relatively quickly due to the effect of the collected cotton (roving) due to the small capacity of the cotton collection box provided in the roving yarn changer 1, a suction source is provided. It is necessary to increase the suction force of the air. As a result, the new roving yarn R sucked in the suction pipe 30 is broken, and the needle 36
In some cases, the tension necessary for a to securely lock the new roving R is not applied to the new roving R. In this case, the needle 36a cannot securely lock the new roving R, and the cutting of the new roving R is not reliably performed at a predetermined position.

However, in the apparatus of this embodiment, the suction action of the suction nozzle 29 causes the needle 36a to securely hold the new roving thread R without tension applied to the new roving thread R. 12A is lowered from the state corresponding to FIGS. 12A and 12B, and the relative movement of the new roving yarn R in the direction of coming out of the suction nozzle 29 causes the second needle 37 to move.
Locks the new roving thread R. As a result, tension necessary for the needle 36a to securely lock the new roving thread R is applied to the new roving thread R between the roving thread splicing head PH and the suction nozzle 29,
As the suction nozzle 29 moves down, the needle 36a securely locks the new roving thread R, and the new roving thread R is reliably cut at a predetermined position as in the above embodiment. That is, in the apparatus of this embodiment, the new roving R can always be reliably cut to a predetermined length without being affected by the suction force of the suction source. Also, the second needle 37
Since the roving yarn does not excessively bite into the new roving yarn R, the roving yarn cut by the second needle 37 is removed by suction by the suction nozzle 29.

The present invention is not limited to the above-mentioned two embodiments. For example, the arrangement pitch and length of the needles 36a of the comb 36, or the arrangement pitch of the second needles 37 in the second embodiment. Alternatively, the amount of protrusion into the suction nozzle 29 may be appropriately changed according to the type of fiber and the thickness of roving.
Also, as shown in FIG. 17 (a), the roving cutting member 33 of the shape obtained by cutting the roving cutting member 33 of the first embodiment into half-pieces 36.
Or a large number of needles 36 as shown in FIG.
Instead of forming the comb 36 from a, the comb 36 may be formed of a thin plate having a serrated cut. In both of the above embodiments, the needle 3 as a locking portion or a first locking portion is used.
Although 6a is arranged to extend in parallel with the end face of the inlet 29a of the suction nozzle 29, it may be arranged at an angle to the end face of the inlet 29a.

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 19 is used.
Is arranged at the upper part of the head body 10 to increase the distance from the gripping point of the new roving yarn R to the lower end of the bulging portion 6a. The length may be such that it does not hinder the insertion of the. 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. Furthermore, the present invention is not limited to a roving splicing device that cuts the old roving R1 before inserting the new roving R into the trumpet 8, and is not limited to a roving splicing device that performs so-called splicing.
No. 957, the new roving yarn R
May be applied to a roving splicing device that cuts the old roving R1 after inserting it into the trumpet 8.

[0038]

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 (a) is a rear view showing a state in which a roving yarn cutting member according to a first embodiment is attached to a suction nozzle, and FIG. 1 (b) is a side view.

2A is a front view of a roving yarn cutting member, and FIG. 2B is a longitudinal sectional view of a leading end of a roving splicing head.

FIG. 3 is a side view of the roving splicing head.

FIG. 4 is a plan view of the roving splicing head with the cover removed.

FIG. 5 is a side view showing a state where a full bobbin is arranged at a roving opening position and a suction nozzle and a roving splicing head are arranged at a standby position.

FIG. 6 is a side view showing a state in which a suction nozzle is arranged at a roving end suction position.

FIG. 7 is a side view showing a state where a new roving is introduced into the roving guide groove of the roving splicing head.

FIG. 8A is a side view showing a positional relationship between a suction nozzle arranged at a roving introduction position and a roving splicing head, and FIG. 8B is a front view.

9A is a side view showing a state in which the suction nozzle is raised to a position where the guide portion engages with the new roving, and FIG. 9B is a partially omitted view taken along the arrow A. FIG.

FIG. 10A is a side view showing a state in which the suction nozzle is raised to a position where the new roving is guided below the locking portion,
(B) is a partially omitted view from the arrow B.

11A is a side view showing a state in which the suction nozzle has reached a highest position during the roving cutting operation, and FIG. 11B is a partially omitted arrow C view.

12A 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.

FIG. 13 is a side view showing a state where a new roving has been cut.

FIG. 14 is a side view showing a state in which an old roving after cutting hangs down from a trumpet.

FIG. 15 is a side view showing a state where the roving cutting member of the second embodiment is attached to the suction nozzle.

FIG. 16 (a) is a front view of a roving cutting member according to a second embodiment, and FIG. 16 (b) is a side view.

FIG. 17 is a front view of a roving yarn cutting member of a modified example.

FIG. 18 is a side sectional view showing an attached state of a roving yarn cutting member of a conventional example.

[Explanation of symbols]

Reference numeral 9: roving guide groove, 19: gripping member, 29: suction nozzle constituting suction means, 29a: inlet section, 30: suction pipe constituting suction means, 33 roving cutting member, 35a: guide section, 36 ... Comb, 36a: needle as locking portion or first locking portion, 37: second needle as second locking portion, F: full bobbin, PH: roving splicing head, R: new roving yarn ,
R1 ... old roving.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiro Tange 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (56) References JP-A-48-4727 (JP, A) JP-A Sho 62-57957 (JP, A) JP-A-2-112426 (JP, A) JP-A-63-41070 (JP, U) JP-A-3-113361 (JP, U) JP-B-47-51649 (JP, A) B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) D01H 15/00 B65H 67/08 D01H 9/00

Claims (2)

(57) [Claims] 1. A roving end suction position above a roving splicing head having a roving yarn guiding groove formed at a tip thereof and a gripping member for gripping a new roving yarn introduced into the roving yarn guiding groove; Above the inlet, outside the suction means movably provided between the roving introduction position below the roving splicing head, and can be locked to the roving when the roving moves relatively upward. A roving yarn cutting device in a roving yarn changer, comprising a locking portion provided above the locking portion, and a guide portion capable of guiding a roving thread to a lower side of the locking portion when the suction means rises. 2. A roving end suction position above a roving splicing head having a roving yarn guiding groove formed at a tip thereof and having a gripping member for gripping a new roving yarn introduced into the roving yarn guiding groove; Above the inlet, outside the suction means movably provided between the roving introduction position below the roving splicing head, and can be locked to the roving when the roving moves relatively upward. A first locking portion provided above the first locking portion, and a guide portion capable of guiding a roving thread to a lower side of the first locking portion when the suction device is lifted is provided above the first locking portion; A roving yarn cutting device in a roving yarn changer provided with a second locking portion that can be locked to a roving yarn at an upper portion of an inlet inside the roving yarn.