JPH10118377A - Empty ring sewing system in over-lock sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an empty ring from hooking an inner pawl and others when moving them to their nip-holding position to achieve enhancing the quality of sewed products, by advancing the empty rings to a position shielding a gap between the pawl tips darning the empty ring guide plate and the corner of needle board at the front side of carrying out a cloth. SOLUTION: Under the suction port 5a into where the empty ring guide plate 34 enters becomes a position available to shield a gap D between the darning pawl 2b tips 2b' of the needle board and its 2 corner 2d at the front side of carrying out a cloth facing there darning pawl 2b tips 2b'. Since advancing the empty ring guide plate 34 to a position under the suction port 5a can, therefore, shield from the sides the gap D between the darning pawl 2b tips 2b' of the needle board and its 2 corner 2d at the front side of carrying out a cloth facing these darning pawl 2b tips 2b', the air being blown out of the suction port 5a can enter under the inner pawl 2c to prevent the empty rings from hooking inner pawl 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine for sewing an empty ring extending from a needle drop portion into a seam of the next fabric when the edge of the fabric is overlocked by an overlock sewing machine. In particular, the free end of the hollow ring formed after the completion of the overlock stitching operation is sucked by the empty ring suction means, and the vicinity of the free end is pinched by the empty ring holding means, and The present invention relates to an empty ring sewing device in an overlock sewing machine which sew a ring to a next fabric seam.

[0002]

2. Description of the Related Art Conventionally, when an overlock sewing machine is used to perform an overlock sewing on an edge portion of a fabric, an unsealed stitch is used as a device for preventing fraying of a seam at the start of the sewing without performing extra work. The device is being used.

FIG. 5 shows a conventional general hollow ring sewing device 1.
It is shown. The empty ring sewing device 1 includes a needle plate 2 fitted on a cloth table A of an overlock sewing machine.
Is configured around. The needle plate 2 has two needle drop portions 2a, 2a where two needles 7 drop, and an overlocking claw 2b and a middle claw 2c which project forward of the needle drop portions 2a, 2a in the cloth transport direction. Is formed. The sewing shaft 3 indicated by a chain line in FIGS. 6 to 8 is an imaginary line indicating a cloth feed line passing through the needle drop portions 2a, 2a of the needle plate 2, and the cloth B is an edge portion to be overlock-stitched. Is positioned outside the sewing shaft 3 (the right side in FIGS. 5 to 8).

[0004] In the vicinity of the needle plate 2, an empty ring cutting means 4 is attached. The hollow ring cutting means 4 has an inlet 5a outside the sewing shaft 3 and near the needle dropping portions 2a, near the front side in the cloth conveying direction, and is connected to an air suction source (not shown). And a cutting blade 6 provided at the suction port 5a. This cutting blade 6
It comprises a fixed blade 6a fixed to the suction port 5a, and a movable blade 6b driven by a member interlocked with the main shaft of the sewing machine. As shown in FIG.
The empty ring C connected to the end of the cloth B is sucked into the suction port 5a, and then the movable blade 6b is driven to cut the empty ring C sucked between the fixed blade 6a. By this cutting, the hollow ring C is brought into a state of being connected to sewing elements such as the overhanging claws 2b and the needles 7 formed in contact with the needle drop portions 2a, 2a of the needle plate 2 with the cut portions as free ends.

[0005] The suction pipe 5 of the hollow ring cutting means 4 has a structure shown in FIG.
As shown in FIG. 8 to FIG. 8, a first air ring blowing means 8 is provided side by side, and the first air ring blowing means 8 includes an air pressure feeding pipe 9 connected to an air pressure feeding source (not shown); This air pressure pipe 9
And a nozzle 10 provided at the tip of the nozzle.
The tip of the nozzle 10 is connected to the suction port 5
a is set in the vicinity of the needle drop side and is directed in a direction intersecting the sewing shaft 3. Therefore, after the cutting blade 6 cuts the empty ring C, the first empty ring blowing means 8 is operated to blow air from the nozzle 10, and the empty ring C is cut.
Is moved toward the sewing shaft 3 with sewing elements such as the needle 7 and the overhanging claw 2b as axes.

The inside of the sewing shaft 3 (FIGS. 5 to 8)
Is provided on the front side of the needle drop portions 2a, 2a in the cloth transport direction, and a second air blow-off means 11 is provided. The air supplied from an air supply source (not shown) is supplied by air pressure. It is jetted from a nozzle 13 through a pipe 12. The tip of the nozzle 13 faces the near side in the cloth transport direction.
The second air ring blowing means 11 is operated simultaneously with the first air ring blowing means 8 after the cutting blade 6 cuts the air ring C, or the second air ring blowing means 8
Is moved to the sewing shaft 3 side and then operated by switching to the first empty ring blowing means 8, whereby the free end of the empty ring C is moved forward of the needle drop portions 2a, 2a in the fabric transport direction. It is made to let.

[0007] Therefore, the first empty ring blowing means 8 and the second empty ring blowing means 11 move the empty ring C to the empty ring holding position.

[0008] An empty ring introduction hole Aa is formed on the cloth table A in front of the needle drop portions 2a, 2a in the cloth transport direction, and penetrates the back side of the cloth table A. Below the upper surface of the needle plate 2 including the lower portion of the needle ring 2, there is provided an empty ring holding means 14 for holding the free end of the empty ring C moved by the second empty ring blowing means 11. The ring holding means 14 includes a pair of holding plates, ie, a fixed plate 15, which are pressed against each other by an elastic urging force.
a, a pressure plate 15b that can move horizontally, and an elastic pressure urging unit 1
6 and a pinching release section 17. The fixed plate 15a and the clamping plate 15b are arranged below the empty ring introduction hole Aa with their contact surfaces parallel to the sewing shaft 3. Among these, the fixed plate 15a is a sewing machine. Fabric table A integrated with the main body
Are fixed to a base 18 by bolts 19. A rod 20 fixed to the clamping surface of the clamping plate 15b and penetrating the fixed plate 15a;
A spring support 21 fixed to the base 18 and through which the rod 20 passes; a roller bearing 22 fixed to the tip of the rod 20; and a compression spring 23 adjusted between the spring support 21 and the roller bearing 22 It is composed of Therefore, when no external force is applied to the elastic urging portion, the pressing plate 15b is pressed against the fixed plate 15a by the elastic pressing force of the compression spring 23. The pinching release portion 17 is pivotally attached to an air cylinder 25 fixed to the base 18 via a fixture 24, a taper member 26 connected to a piston rod 25 a of the air cylinder 25, and the roller bearing 22. Roller 22a,
The tapered surface of the tapered member 26 is in contact with the roller 22a. As shown in FIG. 8, the tapered surface has a shape such that no external force is applied to the elastic pressure urging portion 16 when the piston rod 25a of the air cylinder 25 is retracted.

Accordingly, when the piston rod 25a is extended by controlling the air cylinder 25, the pressure plate 15b fixed to the rod 20 is separated from the fixed plate 15a, and both oppose each other below the empty ring introduction hole Aa. I do.

Below the idle ring holding means 14, an idle ring suction means 27 is provided. This empty ring suction means 2
Reference numeral 7 denotes a suction cylinder connected to an air suction source (not shown) located below the empty ring introduction hole Aa and provided with the empty ring holding means 14.
Is opened upward below the portion where the fixed plate 15a and the clamping plate 15b are disposed, and is operated simultaneously with the second empty ring blowing means 11 so that the needle drop portion 2a is formed by the second empty ring blowing means 11. , 2a is sucked into the suction port 5a at the free end of the empty ring C, which is moved forward in the fabric transport direction.

Therefore, when the pressing plate 15b of the idle ring holding means 14 is separated from the fixed plate 15a and the idle ring suction means 27 is operated, the free end of the empty ring C is pressed with the fixed plate 15a. After being sucked into the suction port 5a of the empty ring suction means 27 through the space between the two plates, the free end of the empty ring C is placed between the two plates. It is to be sandwiched between.

[0012] In the conventional overlock sewing machine 1 having such a configuration, the empty ring sewing device 1 is configured so that the empty ring C produced by being connected to the end of the cloth B can be appropriately lengthened from the sewing elements such as the needle 7. The free end of the cut empty ring C is cut by the first empty ring blowing means 8 and the second empty ring blowing means 11 before the needle drop portions 2a, 2a in the cloth transport direction. Fly near the empty ring introduction hole Aa. At the same time, the free end of the empty ring C is sucked from below by the empty ring suction means 27, and the air cylinder 25 of the pressure release unit 17 is driven to extend the piston rod 25a, thereby separating the piston rod 25a in advance. The free end of the air ring C is inserted between the fixing plate 15a and the pressure plate 15b of the air ring holding means 14, and after this insertion, the piston rod 25a of the air cylinder 25 is retracted to remove the fixed plate 1
The vicinity of the free end of the empty ring C is clamped between 5a and the clamping plate 15b. As a result, the hollow ring C is arranged between the overlocking pawl 2b and the hollow ring holding means 14 to create the hollow ring C by the sewing element such as the needle 7. Therefore, when the new cloth B is set and the overlock sewing is started on the cloth B, the empty ring C is sewn into the seam on the lower surface of the cloth B with the feeding of the cloth B. Become.

[0013]

However, in the empty ring sewing device 1 in the conventional overlock sewing machine,
The free end of the empty ring C is emptied by the air of the first empty ring blowing means 8 and the second empty ring blowing means 11 with respect to the needle dropping portions 2a, 2a on the front side of the needle dropping portions 2a, 2a with respect to the cloth transport direction. When the ring C is moved to the ring holding means 14, the needle C may be caught on the middle pawl 2c or the cloth feed tooth 29 of the needle plate 2 during the movement. Particularly, in an overlock sewing machine that performs overlock stitching with two needles, the middle claw 2c is formed near the overlock claw 2b.
As shown in (2), the empty ring C is easily caught on the inner pawl 2c. If the empty ring C is caught on the middle pawl 2c or the like, the portion of the empty ring C that is caught on the middle pawl 2c or the like from the needle drop portions 2a, 2a even if sucked by the empty ring suction means 27. Until it can be pulled, sag occurs. When the next overlock stitch is performed in this state, the slack portion that is hooked on the inner pawl 2c of the hollow ring C cannot be sewn into the stitch, and the end of the cloth B cannot be sewn. There is a problem that a part of the sewn-out product is protruded and the quality of the sewn product is reduced.

The present invention has been made in view of such a problem, and when the free end of an empty ring is blown away by an empty ring blowing means and moved to an empty ring holding position, the empty ring is caught by a middle claw or the like. It is an object of the present invention to provide an empty ring sewing device in an overlock sewing machine that can prevent the sewing from being performed and improve the quality of a sewn product.

[0015]

In order to achieve the above object, an overlock sewing machine according to the present invention is characterized in that it is capable of moving forward and backward from a needle drop portion on a fabric mounting surface in a fabric conveying direction. An empty ring guide means having an empty ring guide plate is provided, and the empty ring guide plate is opposed to the tip of the overlocking claw and the tip of the overlocking claw so as to regulate the moving direction of the empty ring moving to the empty ring holding position. In a position to shield the gap with the corner of the needle plate on the front side in the fabric transport direction. And
By adopting such a configuration, it is possible to prevent the empty ring from being caught on the inner pawl or the like when the empty ring is moved to the empty ring holding position.

In the overlock sewing machine according to the second aspect of the present invention, the idle ring stitching device is characterized in that the idle ring guide means, at the latest, starts the idle ring guide plate before the idle ring blowing means starts moving the idle ring. The suction pipe is advanced to a position below the suction port of the suction pipe, and the empty ring guide plate is retracted from a position below the suction port at the latest before the start of the next overlocking operation by the overlock sewing machine. And by adopting such a configuration, it is possible to reliably prevent the harmful effect of the empty ring being hooked on the inner pawl or the like.

A feature of the empty ring sewing device in the overlock sewing machine according to the third aspect is that the leading end portion of the empty ring guide plate is formed in a concave shape which is concave in the vertical direction. By adopting such a configuration, the empty ring can be blown off by the empty ring blowing means while regulating the vertical movement direction with the concave portion at the tip of the empty ring guide plate as a fulcrum. The direction of movement to the holding position can be determined more accurately.

[0018]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

In the overlock sewing machine according to the present embodiment, the same components as those of the above-described conventional one in the hollow ring sewing device 1a are denoted by the same reference numerals and described.

FIG. 1 shows an empty-ring sewing apparatus 1a according to this embodiment.
Of the main part of FIG. This empty ring sewing device 1a
Is formed around a needle plate 2 fitted on a cloth table A which is a cloth mounting surface of the overlock sewing machine. The sewing shaft 3 shown by a dashed line in FIG.
a imaginary line indicating a cloth feed line passing through a and 2a, and the cloth B is fed with the edge to be overlock-stitched positioned outside the sewing shaft 3 (right side in FIG. 1). . The needle plate 2 is provided with two needle drop portions 2a, 2a where two needles 7 drop, and an overlocking claw 2b and a middle claw 2c that project forward of the needle drop portions 2a, 2a in the cloth transport direction. Is formed. The overlock claw 2b has 2
The needle thread and the upper and lower looper threads (not shown) are engaged to form an empty ring C.

In the vicinity of the needle plate 2, an annular cutting means 4 is provided. The hollow ring cutting means 4 has an inlet 5a outside the sewing shaft 3 and near the needle dropping portions 2a, near the front side in the cloth conveying direction, and is connected to an air suction source (not shown). And a cutting blade 6 provided at the suction port 5a.
The cutting blade 6 includes a fixed blade 6a fixed to the suction port 5a.
And a movable blade 6b driven by a member linked to the main shaft of the sewing machine. The open-ring cutting means 4 comprises:
The empty ring C connected to the end of the cloth B is sucked into the suction port 5a, and then the movable blade 6b is driven to cut the empty ring C sucked between the fixed blade 6a. By this cutting, the hollow ring C is brought into a state of being connected to sewing elements such as the overhanging claws 2b and the needles 7 formed in contact with the needle drop portions 2a, 2a of the needle plate 2 with the cut portions as free ends.

FIG. 1 shows a suction pipe 5 of the hollow ring cutting means 4.
As shown in (1), the first empty ring blowing means 8 is provided side by side,
The first air ring blowing means 8 is composed of an air pressure pipe 9 connected to an air pressure source (not shown), and a nozzle 10 provided at the tip of the air pressure pipe 9. The tip of the nozzle 10 is set in the vicinity of the needle drop side of the suction port 5 a of the ring-cutting means 4, and is directed in a direction intersecting the sewing shaft 3. Therefore, when the first ring-blowing means 8 is operated to blow air from the nozzle 10 after cutting the ring C with the cutting blade 6, the free end of the ring C is pivoted by the overhanging claw 2b. Is moved to the sewing shaft 3 side.

The suction pipe 5 of the air ring cutting means 4 and the air pressure feeding pipe 9 of the first air ring blowing means 8 are integrally formed, and the air suction source and the air pressure feeding source are sucked by air. The air ring C may be sucked or discharged by selectively performing the suction operation and the pressure feeding operation by switching means such as an electromagnetic valve as a source.

A second empty ring blowing means 11 is provided inside the sewing shaft 3 (on the left side in FIG. 1) and in front of the needle drop portions 2a, 2a in the cloth transport direction. Air supplied from a source (not shown) is supplied to the air supply pipe 12.
Through the nozzle 13. This nozzle 1
The front end of 3 faces the near side in the cloth transport direction. The second empty ring blowing means 11 is operated simultaneously with the first empty ring blowing means 8 after cutting the empty ring C by the cutting blade 6, or
Alternatively, the free end of the empty ring C is moved to the sewing shaft 3 side by the first empty ring blowing means 8 and then switched to the first empty ring blowing means 8 to operate. It is designed to be moved forward in the transport direction.

Therefore, the free end of the empty ring C is moved to the empty ring holding position by the later-described empty ring holding means 14 by the first empty ring blowing means 8 and the second empty ring blowing means 11. Has become.

An annular guide means 30 is provided between the first annular discharge means 8 and the second annular discharge means 11, and is blown by the air of the first annular discharge means 8. The blowing direction of the hollow ring C is regulated. This empty ring guide means 30 is shown in FIGS. FIG. 2 is an enlarged plan view of the idle guide unit 30, and FIG. 3 is a side view thereof. FIG. 4 is a perspective view of the ring guide unit 30. The empty ring guide base 31 is disposed on the cloth table A. On the empty ring guide base 31, a guide plate moving cylinder 32 composed of an air cylinder has a piston rod 32a.
Are arranged so as to reciprocate in parallel with the sewing shaft 3.
A guide plate mounting base 33 is fixed to the distal end of “a”. A substantially flat annular guide plate 34 is fixed to the side surface of the guide plate mounting base 33 by screws 35, and the annular guide plate 34 reciprocates the piston rod 32a of the guide plate moving cylinder 32. The suction port 5a of the suction pipe 5
Below the front of the vehicle.
Below the suction port 5a where the empty ring guide plate 34 advances and retreats, the tip 2b 'of the overlocking claw 2b of the needle plate 2 and the needle plate on the front side in the fabric transport direction facing the tip 2b' of the overlocking claw 2b. 2 is a position where the gap D with the corner 2d can be shielded.

Further, a concave portion 36a is formed in the distal end portion 36 of the empty ring guide plate 34 so as to engage the empty ring C to easily regulate the moving direction, and to be recessed in the vertical direction.

Therefore, when the idle ring guide plate 34 advances to a position below the suction port 5a, the needle plate 2
Since the gap D between the tip 2b 'of the overlock claw 2b and the corner 2d of the needle plate 2 on the front side in the fabric transport direction facing the tip 2b' of the overlock claw 2b can be shielded from the side,
The empty ring C blown out from the suction port 5a is
To be trapped by entering below. Further, the tip 3 of the empty ring guide plate 34
4, the hollow ring C blown out from the suction port 5a is restricted by the distal end portion 36 of the hollow ring guide plate 34 from moving in the vertical direction, as shown in FIG. It is adapted to move to the idle ring clamping position.

It is sufficient that the idle ring guide plate 34 is advanced to a position below the suction port 5a at least before the air blowing operation of the first idle ring blowing means 8 is started. Thereafter, the empty ring guide plate 34 may be retracted after the free end of the empty ring C is clamped by the later-described empty ring holding means 14, and usually the next overlock sewing operation by the overlock sewing machine is started. It is evacuated just before.

An empty ring introduction hole Aa is formed on the cloth table A on the front side of the needle drop portions 2a, 2a in the cloth transport direction, and penetrates the back side of the cloth table A. Below the upper surface of the needle plate 2 including below Aa,
An empty ring holding means 14 for holding the free end of the empty ring C moved by the second empty ring blowing means 11 is provided.
The hollow ring holding means 14 is composed of a pair of holding plates that are pressed against each other by an elastic urging force, that is, the fixed plate 1.
5a, a horizontally movable squeezing plate 15b, an elastic pressure urging portion 16, and a squeezing pressure releasing portion 17.
The fixed plate 15a and the clamping plate 15b are
Below the empty ring introduction hole Aa, the contact surfaces are arranged in parallel with the sewing shaft 3, and the fixing plate 15a is mounted on the base 18 of the cloth table A integrated with the sewing machine main body. It is fixed by bolts 19. The resilient urging portion 16 is fixed to the pressing surface of the pressing plate 15b, and the rod 20 penetrates the fixed plate 15a.
A spring bearing 21 fixed to the base 18 and through which the rod 20 passes, a roller bearing 22 fixed to the tip of the rod 20, and a compression spring 23 adjusted between the spring bearing 21 and the roller bearing 22. It is composed of Therefore, when no external force is applied to this elastic urging part,
The clamping plate 15b is pressed against the fixed plate 15a by the urging force of the compression spring 23. The pinching release portion 17 is pivotally attached to an air cylinder 25 fixed to the base 18 via a fixture 24, a taper member 26 connected to a piston rod 25 a of the air cylinder 25, and the roller bearing 22. The tapered surface of the tapered member 26 is in contact with the roller 22a. When the piston rod 25a of the air cylinder 25 is retracted, the tapered surface serves as the elastic pressure urging portion 1.
6, so as not to give an external force.

Therefore, when the piston rod 25a is extended by controlling the air cylinder 25, the pressure plate 15b fixed to the rod 20 is separated from the fixed plate 15a, and both are opposed to each other below the empty ring introduction hole Aa. I do.

The air cylinder 25 of the squeezing pressure releasing portion 17 is connected to the squeezing plate 1 by the piston rod 25a.
5b may be arranged so as to extend in parallel with the moving direction, and the empty ring holding means 14 may be operated without the taper member 26 or the like.

An empty ring suction means 27 is provided below the empty ring holding means 14. This empty ring suction means 2
7 is a suction cylinder connected to an air suction source (not shown),
Below the empty ring introduction hole Aa and the empty ring holding means 1
4 is opened upward below the portion where the fixing plate 15a and the clamping plate 15b are disposed, and is operated at the same time as the second empty ring blowing means 11 so that the needle dropping section is formed by the second empty ring blowing means 11. The free end of the empty ring C, which has been moved to the front in the fabric transport direction from 2a, 2a, is sucked into the inlet 5a.

Therefore, when the pressing plate 15b of the idle ring holding means 14 is separated from the fixed plate 15a and the idle ring suction means 27 is operated, the free end of the empty ring C is pressed with the fixed plate 15a. After being sucked into the suction port 5a of the empty ring suction means 27 through the space between the two plates, the free end of the empty ring C is placed between the two plates. It is to be sandwiched between.

Next, the operation of the empty ring sewing device 1a in the overlock sewing machine according to the present embodiment will be described.

The empty ring sewing device 1a in the overlock sewing machine according to the present embodiment sucks the empty ring C formed continuously with the end of the fabric B into the suction pipe 5, and removes the empty ring C from the overlocking claw 2b. The ring is cut by the idle ring cutting means 4 while leaving an appropriate length, and the guide plate moving cylinder 32 of the idle ring guide means 30 is cut.
Air is blown into the inside to advance the piston rod 32a from the guide plate moving cylinder 32, and the idle ring guide plate 34 is advanced to a position below the suction port 5a of the suction pipe 5. The free end of the cut empty ring C is blown by the first empty ring blowing means 8 and the second empty ring blowing means 11 to the vicinity of the empty ring introduction hole Aa which is in front of the needle drop portions 2a, 2a in the fabric transport direction. At this time, the empty ring C
Is caught by the concave portion 36a of the distal end portion 36 of the empty ring guide plate 34, and moves to the empty ring holding position while being restricted from moving in the vertical direction. For this reason, the empty ring C is
4 does not move to a position lower than 4 and does not catch on the middle claws 2c or the like. Simultaneously with the flying of the empty ring C, the free end of the empty ring C is sucked by the empty ring suction means 27, and the air cylinder 25 of the pressure release unit 17 is driven to extend the piston rod 25a. Then, the free end of the hollow ring C is inserted between the fixing plate 15a and the pressing plate 15b of the hollow ring holding means 14 which have been separated in advance. After this insertion, the piston rod 25a of the air cylinder 25 is retracted to
The free end of the empty ring C is clamped between 5a and the clamping plate 15b. After the holding of the empty ring C, the piston rod 32a is retracted into the guide plate moving cylinder 32, whereby the empty ring guide plate 34 is retracted from a position below the suction port 5a, and the next sewing operation is performed. At this time, the empty ring C is arranged between the overlocking pawl 2b and the empty ring holding means 14 to create the empty ring C by sewing elements such as the needle 7. Therefore, when a new cloth B is set and overlock sewing is started for this cloth B,
The empty ring C is sewn into the seam on the lower surface of the fabric B with the feeding of the fabric B. At this time, since the free end of the empty ring C is elastically urged by the empty ring holding means 14, the free end of the empty ring C is moved from the empty ring holding means 14 against the urging force by feeding the cloth B. Escape.

Therefore, according to the embodiment of the present invention,
When the empty ring C is moved to the empty ring holding position by the first empty ring blowing means 8 and the second empty ring blowing means 11 in order to clamp the free end of the empty ring C by the empty ring holding means 14, C
Can be prevented from being caught on the inner claws 2c, the cloth feed teeth 29, and the like, and the empty ring C can be completely sewn into the seam at the next overlock stitch, so that the quality of the sewn product can be improved. .

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified as needed.

For example, in the embodiment of the present invention, an empty ring sewing device 1a in an overlock sewing machine that performs overlock stitching with two needles will be described, and the configuration is such that the empty ring C is not caught on a middle nail or the like. Even if the needle plate 2 is a single-needle overlock sewing machine in which the inner pawl is not formed, the empty ring sewing device 1a of the present invention can be additionally provided, so that the empty ring C It can be prevented from being caught on the sewing element around 2b.

[0040]

As described above, according to the empty ring sewing device in the overlock sewing machine according to the present invention, the empty ring is blown off by the empty ring blowing means, and the free end of the empty ring is moved to the empty ring holding position. At the time, the hollow ring is prevented from being caught on the inner nail, the cloth feed dog, etc., and the hollow ring can be completely sewn into the seam at the next overlock stitch, thereby improving the quality of the sewn product. And the like.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part showing an embodiment of an empty ring sewing device according to the present invention.

FIG. 2 is an enlarged plan view showing an idle guide unit according to the embodiment.

FIG. 3 is an enlarged side view showing an empty ring guide unit according to the embodiment.

FIG. 4 is a perspective view showing an empty ring guide unit in the embodiment.

FIG. 5 is a partially cutaway perspective view showing a conventional empty ring sewing device.

FIG. 6 is a plan view illustrating an operation state of a conventional empty ring sewing device.

FIG. 7 is a plan view illustrating an operation state of a conventional empty ring sewing device.

FIG. 8 is a plan view illustrating an operation state of a conventional empty ring sewing device.

FIG. 9 is an explanatory view showing a state in which an empty ring is hooked on a middle claw in a conventional empty ring sewing device.

[Explanation of symbols]

 Reference Signs List 3 sewing shaft 4 empty ring cutting means 5 suction pipe 6 cutting blade 8 first empty ring blowing means 11 second empty ring blowing means 14 empty ring holding means 27 empty ring suction means 30 empty ring guiding means 32 guide plate moving cylinder 34 empty Ring guide plate 36a Recess at the end of empty ring guide plate

Claims (3)

[Claims] 1. An air ring suction means for sucking an air ring formed after an overlock sewing operation by an overlock sewing machine into a suction pipe connected to an air suction source, and a cutting blade disposed in the suction pipe to form an air ring in the suction pipe. An air ring cutting means for cutting the air ring sucked into the air ring into a predetermined length, and blowing air to the air ring located in the suction pipe so that the free end of the air ring is drawn from the suction port of the suction pipe onto the fabric mounting surface. An empty-ring blowing means for moving to the empty-ring holding position set in front of the needle drop section in the fabric transport direction, an empty-ring suction means for sucking the free end of the empty ring from below the empty-ring holding position, and this empty ring An empty ring stitching device that has an empty ring holding means for holding the vicinity of a free end of the empty ring sucked by the suction means, and sews the empty ring during a stitch in the next overlock stitching operation; Empty guide means having a simple empty guide plate. The empty ring guide plate is provided so as to regulate the moving direction of the empty ring that moves to the empty ring holding position. An empty ring sewing device in an overlock sewing machine, wherein the device is advanced to a position where a gap with a corner is shielded. 2. The empty-ring guide means advances the empty-ring guide plate to a position below the suction port of the suction pipe at least before starting the movement of the empty ring by the empty-ring blowing means. 2. The empty-ring sewing apparatus according to claim 1, wherein the empty-ring guide plate is retracted from a position below the suction port before the next overlock sewing operation by the lock sewing machine is started. 3. 3. The empty-ring sewing apparatus according to claim 1, wherein the leading end of the empty-ring guide plate is formed in a concave shape depressed in a vertical direction.