JPH02264692A - Overlock sewing machine for blind stitch with cavity sewing-up device - Google Patents

Abstract

PURPOSE:To provide a knife mechanism just in front of a needle location part by extending a base part of a moving claw so as to cross a sewing line in the lower part of a throat plate of the cloth feed-out side than a cloth edge cutting use knife mechanism, and moving the moving claw in the direction for intersecting with the sewing line. CONSTITUTION:A cavity Ch formed by entwining a thread to a claw part 3 is held between inserting and holding plates 171, 172, a moving claw 3b is allowed to contact closely to a fixed claw 3a, and in a state that a holding rule 12 is allowed to abut on a throat plate 2, a stitching part (a) of a rib stitch ground part A is advanced without passing through a knife mechanism by being guided by the rule 12 in the direction of a needle location part 4, and brought to blind stitch in narrow width. Subsequently, by turning a second inserting and holding plate 172 to the outside direction, the tip of the cavity Ch is cut by the knife mechanism 11, and when a sleeve cloth part B comes near, the rule 12 is moved upward, a stitching part (b) is allowed to pass through the knife mechanism 11 and cut in order, the stitch balancing thread tension is aligned with the sleeve cloth part B, the moving claw 3b is separated from the fixed claw 3a and the stitching part (b) is sewn in wide width. In such a way, the knife mechanism is placed just in front of the needle location part, and even if the radius of curvature is small, cloth can be cut in order exactly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of automatically changing the seam according to the seam part in order to sew the sleeves of a long-sleeved undershirt, etc. This invention relates to an overlock sewing machine for pin stitching with an empty ring sewing device in which the ring is moved to the front side of the needle drop part by wind pressure and sewn into the seam of the next fabric.

[tX: Future technology] The sleeve stitching of a long-sleeved undershirt is done as shown in Figure 7.
After sewing the rubber fabric part A and the sleeve fabric part B together with an overlock sewing machine, cover them with an interlock stitch sewing machine, fold this sewn together in half in the 4ft direction as shown in Figure 8, and sew the rubber fabric A. Part A is sewn together with a blind stitch with a small overlock width, and the seamed part of the sleeve fabric part B is sewn together with an overedge stitch with a large overlock width to form a cylindrical shape.

Conventionally, to repair a long-sleeved undershirt in this way, a different sewing machine was used for each seam part a of the rubber knitted fabric A and the seam part B of the sleeve fabric part B. However, when sewing is performed using different types of sewing machines, the process has to be divided into two, resulting in a problem that efficiency is poor and labor savings cannot be achieved.

For this reason, it has recently been proposed to perform the above-mentioned repairs in one step using a single overlock sewing machine, and an overlock sewing machine that achieves this was developed in the 1970s.
-22551 Publication, Special Publication No. 56-51792,
Alternatively, it is disclosed in Japanese Patent Publication No. 5743274. The overlock sewing machine disclosed in these publications includes a ring supporting pawl portion consisting of a fixed pawl integrally formed on the throat plate and a movable pawl that can be separated from the fixed pawl, and a drive mechanism that drives the movable pawl. The sewing width is changed by switching the thread tension and the position of the applying ruler in conjunction with the movement of the movable claw, and the movable claw is configured to move along the cloth feeding direction. There is. As is clear from this, in the above-mentioned known overlock sewing machine, only the fixed pawl is used to reduce the sewing width, and the fixed pawl and the movable pawl are used to perform sewing when the sewing width is increased. In addition, in the conventional example, the fixed claw and the movable claw merely divide the claw portion, and the tips of each are arranged at the same position when the two are brought into close contact.

In addition, as an overlock sewing machine with auxiliary functions,
For example, a device equipped with an empty ring sewing device as disclosed in Japanese Patent Laid-Open No. 53-128443 is known. In this device, by winding the thread around the claw part, an empty ring is formed by connecting it to the rear end of the seam of the previous fabric, and after this empty ring is cut from the fabric, the thread remains on the sewing machine side. The free end of the empty ring is moved to the front side of the needle drop part by wind pressure, and the moved free end of the empty ring is sucked by the empty ring suction mechanism, and then the empty ring holding part is operated to remove the free end of the empty ring. The empty ring held on the throat plate in this way is sewn into the seam of the next fabric to prevent the seam from fraying at the beginning of the sewing.

[Problems to be Solved by the Invention] Incidentally, this type of overlock sewing machine as described above is equipped with a knife mechanism for trimming the cloth to be sewn in front of the needle drop portion. However, if the movable claw is moved along the cloth feeding direction as in the above-mentioned known example, the knife fifM must be provided at a position away from the needle drop in order to secure a space for its movement. For this reason, the presser foot has to be made longer than usual, which is not a problem, and the cutting point by the knife mechanism may shift from the desired position, especially when sewing the edge of a curved fabric with a small radius of curvature. A problem had arisen.

Furthermore, in the known overlock sewing machine, when the stitch width is to be reduced, only the fixed claw is used, and when the stitch width is to be increased, the fixed claw and the movable claw, which have the same tip position, are arranged in parallel to sew. Therefore, no matter which state it is in, if the empty ring that has been separated from the previous fabric is moved toward the flat front side of the drawing part due to wind pressure, the proximal end of the empty ring will be pulled toward the course side during this movement. When forming a stitch on the next piece of fabric, the needle may pass through the empty loop, making it difficult to sew in the empty loop smoothly.

The present invention was developed in view of the above circumstances, and although the stitching width can be changed, a normal presser foot can be used, and the fabric can always be trimmed accurately with the scalpel machine tM. When the empty ring is moved toward the needle path by wind pressure, the proximal end of the empty ring does not overlap with the needle drop, so that stitches with different seam shapes are continuously formed and it is difficult to start sewing. The purpose of the present invention is to provide an overlock sewing machine for pin stitching with an empty ring sewing device capable of neatly finishing edges.

[Means for Solving the Problems] In the overlock sewing machine with an empty ring sewing device according to the present invention, the movable claw is provided in parallel on the opposite side to the needle drop side of the fixed claw, and the tip of the movable claw is The base of the movable claw, which protrudes from the tip of the fixed claw toward the fabric feeding side and serves as a connecting part with the drive v1 mechanism, extends across the sewing line below the throat plate on the fabric feeding side from the female mechanism for cutting the fabric edge, and is connected to the driving V1 mechanism. It is characterized in that it is supported to move in a direction intersecting the sewing line by operating a mechanism.

[Function] According to the above-described overlock sewing machine for pin stitching with an empty chain sewing device, since the movable claw moves in a direction across the sewing line, a moving space is required in front of the movable claw. First, even though such a movable claw is provided, it is possible to provide a knife mechanism for cutting the fabric edge close to the course section. In addition, since the movable claw is in close contact with the fixed claw, a stepped portion is formed on the claw, so that
By forming an empty ring with this movable claw in close contact with the fixed claw, when the empty ring that is separated from the previous fabric is moved to the front side of the needle drop part by wind pressure, the proximal end of the empty ring is Engages with the step. Therefore, the empty ring beyond the base end rests on the claw part and does not overlap with the course part.

[Example] In the one-nail, three-thread overlock sewing machine of the example shown in the perspective view in FIG. A throat plate 2 having a needle passage portion 4 that passes through the needle plate 2 is fitted therein.

This throat plate 2 is attached to a bracket 5 (
(see FIG. 3) with bolts 6, the upper surface of which forms part of the working surface 1a.

As shown in FIGS. 2A and 2B, a tongue-shaped fixing claw 3a is integrally formed on the throat plate 2. The fixed pawl 3a is connected to the throat plate 2 in front of the course section 4 and faces the throat plate 2 with a gap 21 extending rearward from the course section 4 as a starting point. This fixed claw 3a is provided along with a movable claw 3b which is provided movably in a direction perpendicular to the cloth feeding direction (arrow X-Y direction in FIGS. 2A and 2B) on the opposite side to the course section 4, which will be described below. It constitutes the claw part 3 of the overlock sewing machine.

The movable claw 3b can be brought into close contact with the side surface of the fixed claw 3a, and the rear end 3ba protrudes rearward from the rear end of the fixed claw 3a. Therefore, when the movable claw 3b is in close contact with the fixed claw 3a, the claw portion 3 has a stepped portion 31 on the side opposite to the throat plate 2, as shown in FIG. 2A. Furthermore, when the movable claw 3b is separated from the fixed claw 3a, as shown in FIG. 2B, the side 3aa of the fixed claw 3a facing the throat plate 2
The distance between the fixed claw 3a of b and the opposite side 3bb, that is, the width of the claw portion 3 increases. The side 3bb of the movable claw 3b is curved parabolically in a direction that widens the width of the movable claw 3b, that is, the width of the claw portion 3, toward the front side (arrow A side in the figure).

As shown in FIG. 3, the movable claw 3b has an arm-shaped base 31b at its front end that extends below the throat plate 2 in a direction across the sewing line. The base portion 31b is slidably supported between the bracket 5 and a guide bracket 7 which is detachably attached to the bracket 5. Furthermore, a bifurcated engagement portion 31C that engages with a movable claw drive arm 10, which will be described later, is formed at the tip of the base portion 31b.

A drive mechanism 8 that drives the movable claw 3b includes an air cylinder 9 and a movable claw drive arm 10. The air cylinder 9 is arranged in the extending direction of the base portion 31b. This air cylinder 9 is fixed to the sewing machine body so that a piston rod 9a can expand and contract in the direction of movement of the movable claw 3b. Then, one end of the piston rod 9a is attached to the engaging portion 3.
A movable claw drive arm 10 that engages with 1C is connected. This movable claw drive arm 10 is equipped with a stroke adjusting bolt 11 which can be screwed into the moving direction of the arm 10 and whose tip faces the side wall of the guide bracket 7. That is, by adjusting the thread size of this bolt 11, the claw portion 3f of the movable claw drive arm 1o! ! The position that restricts movement of the I-beam is adjusted.

It is preferable that the movable claw 3b is always urged by a return spring provided in the drive mechanism 8 in the direction of coming into close contact with the fixed claw 3a. In this way, the movable claw 3b can be brought into close contact with the fixed claw 3a very quickly as the air from the air cylinder 9 is removed.

Immediately in front of the movable claw 3b, a knife mechanism 11 is disposed for trimming the edges of the fabric being fed toward the claw portion 3 and the course portion 4 side. This knife mechanism 11 includes a fixed blade 11a fixed below the throat plate 2 and a movable blade 11b supported above the throat plate 2 (see FIGS. 6A to 6G). The fixed blade 11a and the movable blade 11b have cutting edges parallel to the sewing line on the outside of the course section 4, for example, the movable blade 11b
By driving the machine in conjunction with the main shaft of the sewing machine, it cuts the fabric that passes through it.

A ruler 12 is provided on the front side of the knife mechanism 11. This contact ruler 12 has its tip guide surface connected to the knife mechanism 1.
Place the dough slightly inside the knife edge of 4 and insert it into the knife mechanism 11.
It is arranged so that it can be guided to the course section 4 without being cut, and is moved by a ruler drive mechanism 13. As shown in FIG. 4, the terminal end of the applying ruler 12 is rotatably connected to a ruler attachment mechanism 14 mounted on the sewing machine main body.

This ruler mounting mechanism 14 includes a mounting flange 141 fixed to the sewing machine body and a rotating arm 1 connected to the mounting flange 141 so as to be rotatable in the horizontal direction about a shaft 142.
43, and the terminal end of the abutment ruler 12 is connected to this rotating arm 143. Ruler drive vitR13
comprises a rotary lenoid 131, a drive lever 132 fixed to the drive shaft of the rotary lenoid 131, and a connecting link 133 rotatably connected to the drive lever 132 and the terminal end of the abutment ruler 12, respectively. By driving the rotary solenoid 131 and moving the connecting link 133 outward (in the direction of arrow Y in FIG. 4), the ruler 12 can be moved upward. Note that 13a and 13b are stroke adjustment bolts that restrict rotation of the drive lever 132.

That is, the bolt 13a restricts the upward movement of the guide surface of the tip of the abutment ruler 12, and the bolt 13b adjusts the abutment ruler 12 so that it abuts on the throat plate 2 in a horizontal position.

3 used for sewing in this overlock sewing machine
Each wooden thread (not shown) has a pair of threads (1 child 14
a, 14b, thread 1i, child devices 15a, 15b, thread tension device 16a, and IGb to the sewing needle and looper. Then, the thread tension function of one of the pair of thread tension devices for each thread is selectively lost by a known thread tension adjustment mechanism (not shown) disclosed in the above-mentioned Japanese Patent Publication No. 57-43274, etc. The tension can be adjusted in two stages: one for the rubber knitted fabric part and one for the sleeve fabric part.

The overlock sewing machine also includes an empty chain sewing device as described below.

As shown in FIG. 5, the clamping play I/17 constituting the hollow chain sewing device is disposed at a position corresponding to the lower part of the abutting ruler 12, and forms a part of the working surface 1a. ing. This clamping plate 17 includes a second clamping plate 172 formed in an inverted shape when viewed from above, and a second clamping plate 172 formed in an inverted shape when viewed from above.
It consists of a first clamping plate 171 that fits into an L-shaped corner of a clamping plate 172. As shown in Figure 3,
These first clamping plates 171 and second clamping brakes 1-1
72 can be rotated about the bolt 19 that connects each of these plates to the bracket 18 on the front side of the sewing machine. The bracket 18 is bolted to the brackets 1 to 5 fixed to the sewing machine body. The first clamping plate 171 and the second clamping brake 1-172 are always in close contact with each other at a portion parallel to the sewing line, and the line connecting this close contact with the course section 4 is the female ll.
It is provided so as not to intersect with the blade part of H411. Further, the first clamping plate 111 and the second clamping plate 172 are rotated about the bolt 19 by separate drive mechanisms.

Therefore, by driving the first clamping plate 111 and rotating it around the bolt 19, an empty ring insertion hole can be formed between them. In addition, the second clamping plate 17 is placed in a state where this empty ring insertion hole is formed and the empty ring is inserted therein.
By driving 2 and rotating it around the bolt 19, the inserted empty ring can be moved toward the first holding play 1-171. The rotating star of the second holding plate 172 is set so that the line connecting the L-shaped corner and the needle clasp 4 can cross the knife mechanism 11.

On the cloth feeding side of the claw portion 3, a cloth guide 20 is provided that stands up from the work surface 1a and is parallel to and with a predetermined distance from the sewing line. On the back side of the guide surface of the fabric guide 20, a loop cutting section 21 constituting a loop sewing device is provided.

The hollow ring cutting section 21 is connected to an air suction source (not shown) and has a suction passage 22 with the back side of the fabric guide 20 as part of the inner wall. A suction hole 22a of the suction passage 22 is opened in the fabric guide 20 near the rear end of the needle plate 2. Further, a small-diameter blow pipe 23 as shown in FIG. 1 is connected to the suction passage 22 midway therein for feeding air under pressure to the suction hole 22a side. A cutter 24 is provided in the suction hole 22a.

The cutter 24 includes a fixed blade 24a whose cutting edge is fixed to the lower surface of the suction hole 22a, and a movable blade 24b inserted into the suction passage 22 from the upper surface of the suction passage 22. The movable blade 24b is driven, for example, by a member linked to the main shaft of the sewing machine, so that its cutting edge intersects with the cutting edge of the fixed blade 24a.

A nozzle 26a is disposed diagonally in front of the suction hole 22a, protruding from a long hole 25 extending through the working surface 1a. This nozzle 26a is a nozzle of the blow-by 126, and is provided with a horizontally elongated air outlet 2Gaa for blowing out air to the holding plate 17 side over the work surface 1a.

As shown in FIG. 1, the ring sewing device also includes a blow pipe 2 that blows air toward the ring insertion hole formed by driving the first holding plate 171.
The nozzle 27a of No. 7 is arranged above the clamping plays 1 and 17.

The empty ring sewing device includes the first clamping plate 17 as described above.
1 and a second clamping plate 112
, each drive mechanism $1 that drives these first and second clamping plates 172, respectively (only a part of the drive mechanism 72 that drives the second clamping plate 112 is shown in FIG. 1,
(The drive mechanism that drives the first holding plate 111 is not shown)
, an empty ring cutting section 21, blow pipes 23.2G, 27, and the aforementioned knife mechanism 11. Note that the drive mechanism 72 connects the swing arm 72a to the air cylinder 7.
21), the second holding plate 172 engaged with the swinging arm 72a is driven.

28 is a presser foot that holds the fabric between it and the throat plate 2. This presser foot 28 is moved by operating a drive mechanism consisting of an air cylinder 29 and an arm 30 that is connected to a piston rod (not shown) of this air cylinder 29 and has this presser foot 28 attached to its tip. It can be moved up and down between the dough presser position and the presser release position.

According to the overlock sewing machine for overlock stitching with the loop sewing device configured as described above, sleeve sewing of a long-sleeved shirt can be performed in the following manner.

FIG. 6A shows a state in which the free end of the empty ring Cl+ formed by entangling the thread around the claw part 3 is held between the first holding plate 1-171 and the second holding plate 172, which are not rotated together. ing. At this time, the movable claw 31) is in close contact with the fixed claw 3a, and the contact ruler 12 is in a lowered position where it contacts the throat plate 2. Further, the thread tension is set for the rubber knitted fabric portion. In this state, after inserting the rubber knitted fabric portion A shown in FIG. Proceed.

In this way, the rubber knitted fabric portion A is guided by the guide surface at the tip of the ruler 12 and is sent to the needle holder 4 without passing through the knife mechanism 11.

The movable claw 3b is in close contact with the fixed claw 3a, so the seam part a is sewn using the narrow claw part 3 and with the thread tension set for the rubber knitted fabric part. . That is, the stitched portion a of the rubber knitted fabric portion A is stitched with a loose needle thread and a narrow hem stitch.

In addition, in the overlock sewing machine for lining stitches with the empty chain sewing device of the embodiment, when the lining stitches have been sewn several times after starting the lining stitches in this way, the arrow P in FIG. 6B is displayed.
As shown by 1, the first clamping plate 1 171 is rotated to release clamping of the empty ring C1+. In this way, the tip of the rubber knitted fabric is prevented from being pulled by the empty ring Cb and curled.

In the embodiment, the second clamping plate 1-172 is further rotated outward (in the direction of arrow P2 in FIG. 6C) toward the first clamping plate 171 after a predetermined period of time has elapsed since the start of the crimp stitch. ing. In this way, the free end side of the empty ring Cb is pushed and moved by the single-shaped corner of the second clamping plate 1-172, so that the empty icl+ intersects with the female mechanism 11 and is cut.

That is, by appropriately setting the timing of driving the second holding plate 112, the length of the empty ring C1+ to be sewn into the first part of the rubber knitted fabric portion can be set to a desired length. After cutting the empty ring Ch, the first clamping play 1-1
71 returns to its original position while remaining in close contact with the second clamping plate 172.

Next, as described above, the stitched part a of the rubber knitted fabric part A is
When the sewn part of the rubber knitted fabric part A and the sleeve fabric part B reaches the placement part of the stopper JU12 while it is being sewn, the rotary lenoid 131 is driven, as shown in FIG. 6D. Point the guide surface at the tip of the ruler 12 with the arrow P.
Raise in 3 directions. With this, the sewing part of the sleeve fabric part B is cut out by the knife machine t! 11, and the edges are trimmed as the fabric progresses.

Note that the fact that the seamed part of the rubber knitted fabric part A and the sleeve fabric part B has reached the placement part of the guide ruler 12 means that, for example, the fabric passing through point 1-Pll of the front end corresponding part of the tip guide surface is detected. This can be known as the detection result of the first optical sensor shown in FIG. However, the above mentioned ruler 12
A first optical sensor is provided to detect the fabric at a point 1- which is further forward than the front end corresponding part, and the number of stitches of the sewing needle from the detection point to the front end corresponding part is counted, and this number of stitches is reset by 1. It may also be compared with the number of hand movements.

Next, the sewing progresses further, and the rubber knitted fabric part A and the sleeve fabric part B
Immediately before the sewing part reaches the needle path part 4, for example, three stitches before reaching the needle path part 4, if you count the number of stitches, the thread tension regulator 14a
, 14b, thread tension device 15a, 15b, thread tension device 16
a and 16b are operated by the thread tension adjustment mechanism to set the thread tension for the sleeve fabric portion. By doing this, the stitch width remains the same, but the needle thread becomes tighter and stronger.

Then, after a few more stitches (for example, 3 stitches), the air cylinder 9 is activated to separate the movable claw 3b from the fixed claw 3a as shown by arrow P4 in FIG. 6E.

In this case, the movable claw 3b is spaced apart from the fixed claw 3a, so that the claw portion 3 becomes wider. Then, using this claw portion 3 and with the thread tension set for the sleeve fabric portion, the seam portion is sewn.

That is, the seams of the sleeve fabric portion B are stitched with a tight needle thread and a wide hem stitch, which is typical of an overlock sewing machine. At this time, in the overlock sewing machine of the embodiment, the knife mechanism 11 is disposed in the straight line 111f of the movable claw 31) that moves in the direction perpendicular to the sewing line, that is, in front of the needle path section 4, so that the fabric does not curve. Even when drawing, the edges of the fabric are trimmed without any errors.

By the way, in this embodiment, in addition to the first optical sensor 41, there is a sensor located on the fabric feeding side of the knife mechanism 11 and on the needle path section 4.
A second optical sensor 42 as shown in FIG. 1 is provided so as to detect the fabric passing through the point 12 on the inside (arrow X side). Such a second optical sensor 42
, the second optical sensor 41 detects that the stitched part of the rubber knitted fabric part Kimitoto and the sleeve fabric part B has reached the area where the ruler 12 is placed. 4
2 detects the rubber knitted fabric portion A, therefore, the timing for raising the tip guide surface of the knife mechanism 11 as described above is when the first optical sensor 41 and the second optical sensor 42 detect the fabric at the same time. Later. Therefore, when the second optical sensor 42 is provided, the thread tension, the applying ruler 12 and the movable claw 3
The condition for returning the state b, that is, the sewing state to the state for the rubber knitted fabric portion A, can be set to when the second optical sensor 42 no longer detects the fabric. By doing this, - part B of the sleeve fabric where the wide stitching begins.
Even if the edge of the rubber knitted fabric part A comes off the detection point 1-Pll of the first optical sensor 41 during sewing, this will not cause the rubber knitted fabric part A to return to the narrow stitching state. , sewing of the sleeve fabric portion B with a wide overlock width is continued. Therefore, even if the difference in width between the sleeve fabric portion B and the rubber knitted fabric portion A is small, the edge of the sleeve fabric portion B may be detected at the detection point 1-P of the first optical sensor 41 during sewing.
Even if it deviates from ll, the edge of the sleeve fabric portion B will not be sewn with a narrow width.

After the seam part of the sleeve fabric portion B is oversewn in the state shown in FIG. 6E above, an empty ring C11 as shown in FIG.
' is formed. As shown in FIG. 6F, the 1E trader moves the end of the sleeve fabric portion B and suctions it into the suction passage 22, so that it intersects with the cutter 24 and is placed approximately at a constant position on the sewing machine (Ill). It is separated from the sleeve fabric portion B leaving the length intact.At this time, as shown by arrow P5,
The movable claw 3b is brought into close contact with the fixed claw 3a again.

After cutting the empty ring Cb'' in this way, the driving of the sewing machine is stopped, and the presser foot 28 is raised by depressing the footboard (not shown) of the sewing machine, etc., and then the suction hole 22
The operation of the air suction source connected to a is stopped, and air is force-fed from the blow vibe 23. By the air pumped from the blow vibe 23, the empty ring Ch' remaining on the sewing machine side, which had been sucked into the suction hole 22a, is pushed out in front of the air outlet 26aa diagonally in front of the suction hole 22a.

Then, the pressure feeding of air from the blow vibe 23 is stopped,
Next, air is blown out from the nozzle 2Ga of the blow vibe 26. The air blown out from the nozzle 26a moves the empty ring Ch' toward the front side of the course portion 4. At the same time, as shown by arrow P6, the first clamping plate 11
1 to open the hollow ring insertion hole l and blow out air from the nozzle 27a of the blow vibe 27. As a result, as shown in FIG. 6G, the free end of the hollow ring C11' It is inserted into the ring insertion hole 1-1.

In this way, the base end of the empty ring C1 B is continuously pulled toward the front side of the empty ring C1.
Since the base end of 11' is engaged with the stepped part 31 of the claw part 3, it will not move to the position of the course part 4, and therefore the empty ring Ch' will not overlap the course part 4.

By returning the first clamping brake 1/171 to its original position again in the state shown in FIG. 6G, the state shown in FIG. 6A is reproduced.

[Effects of the Invention 1] As is clear from the above description, according to the overlock sewing machine for pin stitching with an empty chain sewing device according to the present invention, the overlocking width is changed by moving the movable claw. However, since the knife mechanism that trims the edges of the fabric can be placed just before the course, the knife machine ↑14 can accurately trim the edge of the fabric even if the fabric has a curved section with a small radius of curvature. This has the effect that curved parts can be traced. In addition, the course section and scalpel machine
116 can be moved close to each other, there is no need to lengthen the presser foot, and this does not cause a decrease in the blocking performance.

Further, even though the air ring is moved in front of the course section by wind pressure, the air ring does not overlap the course section.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an overlock sewing machine for pin stitching with an empty chain sewing device, Figs. 2A and 2B are plan views of the throat plate, Fig. 3 is a perspective explanatory view showing the drive mechanism of the movable claw, 4 is a perspective explanatory view showing the drive mechanism of the guard ruler, FIG. 5 is a schematic plan view illustrating the empty ring sewing device, FIGS. 6A to 6G are perspective explanatory views illustrating the sewing process, and FIG. 7 8 is a schematic diagram showing a preliminary sewing product of a sleeve, and FIG. 8 is a schematic diagram showing a sleeve obtained by sewing the preliminary sewing product 111h of FIG. 7. 2... Throat plate 3a... Fixed claw 3b... Movable claw 311)... Base 8... Drive mechanism 11... Female mechanism 12... Applying ruler

Claims (1)

[Claims] (1) Equipped with a claw part for supporting the hollow ring consisting of a fixed claw integrally formed on the throat plate and a movable claw that can be separated from the fixed claw, and a drive mechanism that drives the movable claw, the movable claw can be moved. The seam can be changed by changing the thread tension and the position of the ruler, and by twisting the thread around the hook, the thread can be connected to the seam formed at the edge of the fabric. In an overlock sewing machine for pine stitching with an empty ring sewing device that separates the ring from this fabric and moves the empty ring remaining on the sewing machine side to the front of the needle droplet using wind pressure, the movable claw is attached to the needle droplet of the fixed claw. The tip of the movable claw protrudes from the tip of the fixed claw toward the fabric feeding side, and the base of the movable claw, which is the connection part with the drive mechanism, is provided in parallel on the opposite side of the fabric. An overcoat for pin stitching with an empty chain sewing device, which extends across the sewing line below the throat plate on the delivery side, and is supported so as to be moved in a direction crossing the sewing line by operating a drive mechanism. Lock sewing machine.