JPH09225166A - Eyelet hole darning sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyelet hole darning sewing machine with which the end of a cut looper thread protruded from a throat plate can be wound into the stitch of the next eyelet hole so as not to close an eyelet hole. SOLUTION: When moving working fabric to an origin on a feeding table after stitches are formed on the working fabric, the looper thread is guided from the final stitch through a guide groove 62a into a needle hole. Afterwards, that looper thread is held between the rear end part of a throat plate 62 and a looper thread presser part 57b and cut by a looper thread cutting mechanism 49 later, and the end of that cut looper thread is wound into the next stitch by moving the working fabric on the feeding table in order to darn the next eyelet hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet boring capable of properly preparing the looper thread when cutting the looper thread and starting the sewing operation of the next eyelet hole after the sewing operation of the eyelet hole is completed. Regarding sewing machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 13, an eyelet hole consisting of an eyelet hole portion and a linear hole portion continuous with the eyelet hole portion is formed in a work cloth, and then the right side of the linear hole portion is sewn and then There is provided an eyelet buttonholing sewing machine which automatically performs overlock stitching on an eyelet hole by a procedure of sewing the eyelet section and subsequently sewing the left side of the straight hole section.

This eyelet buttonhole sewing machine main body is constructed by integrally forming a bed portion having a substantially rectangular box shape with an arm portion extending forward from an upper rear portion thereof. A needle bar to which a sewing needle is attached is provided to be movable up and down at the tip of the arm part, and the bed part is provided with two loopers located immediately below the needle bar and having a looper base 95 (see FIG. 9). Are shown). These loopers work in synchronization with the top and bottom of the needle bar to cooperate with the sewing needle to form a stitch on the work cloth. Further, the bed part is provided with a cutter device consisting of a lower knife positioned on the inner side of the looper base and a hammer which comes in contact with and separates from the lower knife from above, and the cutter device forms a straight line with the eyelet hole part on the work cloth. It is possible to form an eyelet-shaped notch that is continuous with the hole.

A feed table on which a work cloth is set is provided on the upper surface of the bed, and a pair of cloth retainers for holding the set work cloth on both sides of the cut are provided on the feed table. ing. The feed table has a thin rectangular box shape as a whole, and is moved to a desired position in the X direction and the Y direction orthogonal to each other by a feed device having two pulse motors for the X direction and the Y direction. .

Next, the looper base 95 is shown in FIG.
It will be described with reference to FIGS.

FIG. 9 is a view of the looper base 95 as seen from the side of the sewing machine. FIG. 10 is a view of the looper base 95 as seen from the front of the sewing machine. FIG. 11 is a view of FIG. 9 seen from above.

At the upper end of the looper base 95, a slot plate 90 as a needle plate having a needle hole is provided, and a thread guide groove 92 is provided at the front part of the throat plate 90. In addition, the slot plate 90
A thread holding mechanism 94 is provided at the front end of the. Looper holder to which the above-mentioned two loopers are attached
80 is rotatably supported by a support shaft 81.
Similarly, the lever 82 is also rotatably supported by the support shaft 81. The lever 82 is normally pulled in one direction by a spring 83 and is positioned on the lever 82 by an adjustable stopper composed of a tightening screw 84 and a nut 85. The looper thread presser base 86 is attached to the lever 82 so as to be vertically adjustable. The looper thread retainer 87 is the looper thread retainer 87.
It is rotatably supported by a support pin 88 on the thread presser base 86, and is always supported by the spring 93 by the looper thread presser 8
The looper thread pressing portion 87a of No. 7 is pressed against the front end surface of the slot plate 90. Further, the lever 82
Is the stopper portion 82 due to the vertical movement of the lever hammer 61.
It is rotated until a and the stopper portion 96 of the looper base 95 come into contact with each other. At this time, the looper thread retainer 87
Is positioned by hitting the screw head of the tightening screw 89 guiding the spring 93 attached to the looper thread presser base 86, and as shown in FIG.
The looper thread retainer portion 87a of the looper thread retainer 87 securely holds the looper thread in order to securely hold the looper thread.
The front end surface of the belt 90 is configured to overlap with a certain amount. The looper thread presser 87 and the looper thread presser 87a constitute a thread holding mechanism 94.

In the eyelet hole overlock sewing machine configured as described above, after the work cloth is set on the feed table, the work cloth is moved to the position where the eyelet holes are formed by the cutter device. This position is the origin. After that, as shown in FIG. 12A, a seam is formed by the looper and the needle bar. Next, the work cloth is moved to the origin by the feed table, and the lever hammer 61 operates to rotate the lever 82 about the support shaft 81.
Then, the looper thread pressing portion 87a is moved to the position shown in FIG.
Move to the right in (b). Therefore, the looper thread is guided to the guide groove, and then the lever hammer 61 is actuated again to rotate the lever 82 about the support shaft 81. As shown in (c), it moves to the left side, and the end surface of the throat plate 90 and the looper thread pressing portion 87a.
Hold the looper thread by and. After that, the looper thread is cut by a cutter (not shown) near the last seam, and the thread end of the looper thread held by the end surface of the throat plate 90 and the looper thread holding portion 87a becomes in an unstable state (Fig. 12 ( d)). After that, the looper base 95 is rotated 180 degrees (FIG. 12E), the next eyelet hole is formed in the work cloth by the cutter device, and then the work cloth is moved to the sewing start position together with the feed table (FIG. 12). (F)). Then, the formation of the next stitch is started (FIG. 12 (g)).

[0009]

However, in the eyelet buttonhole sewing machine having the conventional thread holding mechanism, as shown in FIG.
As shown in FIG. 2 (d), when the looper thread is thread-cut after the end of sewing, a certain amount of the looper thread is protruding from the needle hole of the slow plate. When performing eyelet hole sewing, a certain amount of the looper thread 1 from the first stitch of the work cloth.
00 was hanging down. The hanging looper thread 100 is in an unstable state and may be sewn into the seam of the next eyelet hole. In this case, if the eyelet holes are sewn so as to close the eyelet holes, there is a problem that it takes time to remove the sewn looper thread 100.

The present invention has been made to solve the above-mentioned problems, so that the cut looper yarn ends protruding from the slot plate will not block the eyelet holes. In addition, it is an object of the present invention to provide an eyelet buttonholing sewing machine that can be rolled into the seam of the next eyelet hole.

[0011]

In order to achieve this object, an eyelet buttonhole sewing machine according to a first aspect of the present invention is provided with a feed plate provided on an upper surface of a bed and on which a work cloth is set.
A feeding device for feeding and moving the feed plate along the cut shape of the eyelet hole formed in the work cloth, a needle bar provided with a sewing needle on the arm part, and the needle bar on the bed part. A looper base having loopers provided to face each other, a needle plate provided on the upper part of the looper base and having a needle hole, and a thread presser portion provided on the looper base and holding the looper thread together with the end of the needle plate. , A cutting part for cutting the looper thread pressed by the thread pressing part is targeted, in particular, in the rear part of the needle plate,
After forming a seam on the work cloth, when the work cloth is moved to the origin by the feeding device, a guide groove for guiding the looper thread from the last seam to the needle hole is provided, and the thread pressing portion is provided. It is located near the guide groove.
Therefore, after forming the seam on the work cloth, when the work cloth is moved to the origin by the feeding device, the looper thread is guided from the last seam to the needle hole through the guide groove, and then,
The looper thread is held by the rear end of the needle plate and the looper thread retainer, and then cut by the cutting section, and the cut looper thread end is fed with a work cloth for sewing the next eyelet hole. I am trying to get caught in the next stitch by moving it.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the eyelet buttonholing sewing machine of the present invention will be described below with reference to the drawings.

Eyelet buttonholing machine body 4 of the present embodiment
Is fixed on the sewing machine table 9 as shown in FIG. 4, and the operator is located on the left side in FIG. Therefore, the front surface of the eyelet buttonhole sewing machine body 4 is the left side in FIG. The eyelet buttonhole sewing machine main body 4 is constructed by integrally forming a substantially rectangular box-shaped bed portion 5 with an arm portion 6 extending forward from an upper rear portion thereof.

As shown in FIG. 5, the sewing machine table 9 includes a sewing machine motor 10 as a drive source, which will be described later, an operation panel 11 as shown in FIG. 7, a foot-operated presser foot switch 38, a start switch 12 and the like. A CPU 13, a ROM 14, and a RAM 15 that are provided and control the operation of each mechanism.
A control device 16 including the above is provided.

The needle bar 8 provided on the arm portion 6 is not shown in detail, but the rotational force of the main shaft 18 which is rotated by the drive of the sewing machine motor 10 is transmitted by a cam mechanism so that the needle bar 8 has a predetermined width L. It is designed to be driven vertically while swinging. Further, the bed portion 5 is provided with a looper base 17 having two loopers (not shown) facing the needle bar 8, and rotation of the main shaft 18 is also applied to the looper via a cam mechanism (not shown). The looper is transmitted and is driven in synchronization with the vertical movement of the needle bar 8.

The needle bar 8 and the looper base 17
Is a θ-axis pulse motor 19 provided in the bed unit 5.
A rotation mechanism 21 including a gear mechanism 20 and the gear mechanism 20 are configured to integrally rotate in the horizontal direction.

The bed part 5 includes the looper base 1.
A knife 22 is mounted on the back side of the hammer 7, and a hammer 2 is attached to and detached from the knife 22 from above.
3 are provided. The hammer 23 is a knife driving mechanism 24 including an air cylinder or the like provided in the bed portion 5.
Driven by (shown in FIG. 5).

A feed table 25 on which a work cloth is set is provided on the upper surface of the bed 5. A cloth presser 41 (shown in FIG. 6) for pressing the work cloth at the left and right portions of the eyelet hole is provided on the upper surface of the feed table 25.
Although not shown in detail, the feed table 25 includes an X-axis pulse motor 26 and a Y-axis pulse motor 26 provided in the bed portion 5.
A feed mechanism 28 (shown in FIG. 1), which is a feed device including an axis pulse motor 27, horizontally moves in the X-axis direction (left-right direction) and the Y-axis direction (front-back direction).

As shown in FIG. 6, a metal cross plate 44 is provided on the upper surface of the feed table 25.
The cross plate 44 is provided with an opening 43 corresponding to the knife 22 and extending long in the front-rear direction. Also,
On the cross plate 44, the cloth presser 41 is provided on both left and right sides of the opening 43. Furthermore,
The cross plate 44 is provided with a looper thread cutting mechanism 49 as a cutting section. The looper thread cutting mechanism 49 includes a looper thread cutter 47 provided in the feed table 25 and an air cylinder (not shown) provided in the feed table 25. The looper thread cutter 47 is biased in the counterclockwise direction by a spring 48 and is always in the position shown in FIG. 6, and when the air cylinder is operated, the looper thread cutter 47 is rotated in the clockwise direction. .

Next, the looper base 17 is shown in FIG.
This will be described with reference to FIGS.

At the upper end of the looper base 17, there are provided a slot plate 62 as a needle plate and a thread pressing portion 3 for holding the looper thread in cooperation with the end of the throat plate 62. . Further, the looper base 17 is provided with a looper holder 50 described later.
The looper holder 50 to which the two loopers (not shown) are attached is rotatably supported by a support shaft 51. Similarly, the lever 52 also has the support shaft 51.
To be rotatable. The lever 52 is usually pulled in one direction by a spring 53, and is positioned on the lever 52 by an adjustable stopper composed of a tightening screw 54 and a nut 55.
Further, the thrust direction of the lever 52 is set in the set color.
Positioned by 60. Looper thread clamp 5
6 is attached to the lever 52 so as to be adjustable in the vertical direction. The looper thread retainer 57 is rotatably supported by the support pin 58 on the looper thread retainer 56, and is always provided by a spring 63 at the tip of the looper thread retainer 57. The par thread holding portion 57b is pressed against the rear end surface of the slot plate 62. The spring 63 is guided by a tightening screw 59. When the tightening screw 59 is tightened, the pressing force becomes strong, and when the tightening screw 59 is loosened, the pressing force becomes weak.

Further, the lever 52 is a lever hammer.
It is rotated by 61 until the stopper portion 52a and the stopper portion 67 of the looper base 17 come into contact with each other. At this time, the looper thread presser 57 is connected to the looper thread presser base 56.
The stopper portion 56a provided on the looper thread and the stopper portion 57a provided on the looper thread presser 57 contact each other for positioning. As shown in FIG. 3, the looper
The looper thread retaining portion 57b of the thread retainer 57 is configured to wrap a certain amount with the rear end surface of the slow plate 62 in order to securely retain the looper thread. The slot plate 62 is provided with a guide groove 62a for guiding the looper yarn.

The control device 16 is, as shown in FIG.
Based on the operation of the work clamp switch 38 and the start switch 12, the knife drive mechanism 24 is controlled according to the program written in the ROM 14 and the sewing data stored in the RAM 15 described later, and the drivers 33, 34, 3 are also provided.
The sewing machine motor 10, the X-axis pulse motor 26, the Y-axis pulse motor 27, and the θ-axis pulse motor 19 are controlled via 5, 36. Also, the control device 1
6, a needle position detection signal from a needle position detection sensor 37 that detects the rotational position of the main shaft 18 is input, and the X-axis pulse motor 26,
The Y-axis pulse motor 27 and the θ-axis pulse motor 19 are driven at timings.

Now, on the operation panel 11, as shown in FIG. 7, an item display portion 29 for selecting a sewing shape,
A numerical value display section 30 for displaying up to three digits and a key operation section 31 as an input means are provided. Key operation part 31
Is composed of a selection key 31a for selecting an item, an up key 31b for increasing and decreasing a numerical value, and a down key 31c. In the item display portion 29, sewing length A, pitch B, number of stitches C, straight bar tack length D, number of straight bar tacks E, straight bar tack width correction F, and straight bar tack overlap amount G are described. An LED 32 is provided corresponding to each item.

On the operation panel 11, the selection key 3
1a, Up key 31b, Down key 31c, etc. are operated to input the straight bar tack length D, the number of straight bar tacks E, the straight bar tack width correction F, the straight bar tack overlap amount G, etc. Is possible. Although the creation algorithm is omitted here, when sewing is performed based on the sewing data created under such conditions, a stitch as shown in FIG. 13 is formed.

Next, the operation of straight bar tacking will be described with reference to FIG.

When a work cloth is set on the upper surface of the feed table 25 and the start switch 12 is pressed, a work cloth presser (not shown) for pressing the work cloth at the left and right portions of the eyelet hole is operated, and at the same time, the feed is performed. The table 25 moves to a predetermined sewing start position. Sewing is started based on the sewing data programmed in the operation panel 11, and the seams as shown in FIG. 13 are formed. When sewing is completed (Fig. 8
In (a)), since the needle bar 8 and the looper base 17 are located at 270 ° when the sewing start position is 0 °,
After the needle bar 8 and the looper base 17 are rotated to a position of 180 °, the lever hammer 61 is actuated, and the upper thread formed on the front portion of the slow plate 62. A thread cutting mechanism (not shown) operates to perform needle thread cutting (FIG. 8).
(B)). Next, the needle bar 8 and the looper base 17 are set to 0.
After being rotated to the position of °, the lever hammer 61 is actuated again, and the lever hammer 61 is actuated to rotate the lever 52 about the support shaft 51. Therefore, the looper thread retainer 57 also rotates to rotate the spool.
The looper thread guide groove 62a of the plate 62 is opened (FIG. 8 (c)). The feed table 25 moves to the cloth setting position (origin) while the looper thread retainer 57 is rotated, so that the looper thread connected from the stitch is inside the guide groove 62a. 8 (d), the feed table 25 has finished moving to the cloth setting position (origin), and at the same time, the lever hammer 61 is activated to operate the looper.
Looper of thread retainer 57 Thread retainer 57b and slot press
The looper thread is securely held by the rear end of the boot 62 (FIG. 8).
(E)).

Next, the cloth retainer (not shown) is raised and the looper thread cutting mechanism 49 is operated, the looper thread is cut, and one eyelet hole sewing is completed (FIG. 8). (F)).

At this time, the loop held by the looper thread pressing portion 57b and the rear end portion of the slot plate 62 is held.
The par thread is in a state of protruding from the rear end of the slot plate 62. In this state, the next work cloth for eyelet hole sewing is set on the feed table 25 and the start switch 1
When 2 is pressed, the feed table 25 moves to the sewing start position and the stitches of the first stitch are formed. Then the second needle,
The number of looper threads protruding from the rear end portion of the slot plate 62 as the number of needles increases ...
It is sewn into the seam while being guided by the guide groove 62a (FIG. 8 (g, h)).

As is apparent from the above description, in the eyelet buttonhole sewing machine of the present embodiment, when the work cloth is moved to the origin by the feed table 25 after the seam is formed on the work cloth, the looper thread is the last thread. From the seam of the looper to the needle hole through the guide groove, and then the looper thread is held by the rear end of the throat plate 62 and the looper thread retainer 57b, and then cut by the looper thread cutting mechanism 49. Since the cut looper thread end is wound into the next stitch by moving the work cloth by the feed table 25 in order to sew the next eyelet hole, the cut looper is cut out from the slot plate. The looper thread ends do not block the eyelet holes.

In this embodiment, the looper thread holding pressure is adjustable, but the looper thread holding pressure may be fixed. Further, in the present embodiment, the linear bartack-locking eyelet hole overlock sewing machine has been described, but a round bar-tacking eyelet hole overlock sewing machine or the like may be appropriately modified and implemented without departing from the scope of the invention.

[0032]

As is apparent from the above description, in the eyelet buttonhole sewing machine of the present invention, when the work cloth is moved to the origin by the feeding device after the seam is formed on the work cloth, the looper thread is moved to the last position. The looper thread is guided from the seam through the guide groove to the needle hole, and then the looper thread is held by the rear end of the needle plate and the looper thread retainer, and then cut by the looper thread cutting mechanism, and the cut looper is cut. Since the thread end is wound around the next stitch by moving the work cloth by the feeding device to sew the next eyelet hole, the cut looper thread end protruding from the needle plate causes It will no longer block the eyelet holes.

[Brief description of drawings]

FIG. 1 is a side view of a looper base used in an eyelet buttonholing machine of the present embodiment.

FIG. 2 is a front view of a looper base used in the eyelet buttonholing machine of the present embodiment.

FIG. 3 is a top view of a looper base used in the eyelet buttonholing machine of the present embodiment.

FIG. 4 is a side view of the eyelet buttonholing machine of the present embodiment.

FIG. 5 is a block diagram showing an electric circuit configuration used in the eyelet buttonhole sewing machine of the present embodiment.

FIG. 6 is a view showing a looper thread cutting mechanism used in the eyelet buttonhole sewing machine of the present embodiment.

FIG. 7 is a view showing a panel used in the eyelet buttonholing machine of the present embodiment.

FIG. 8 is a diagram showing a sewing operation of the eyelet buttonholing machine of the present embodiment, wherein (a) shows a stitch end state,
(B) shows a state in which the upper thread is cut, (c) shows a state in which the looper thread pressing portion opens the guide groove, and (d).
Shows a state in which the work cloth has moved to the origin, (e) shows a state in which the looper thread is held by the needle plate end portion and the looper thread pressing section, and (f) shows the looper thread cutting mechanism using the looper thread cutting mechanism. The state where the thread is cut is shown, (g) is
The state where sewing is started in the next eyelet hole is shown, (h) is
The cut looper thread end is shown as being wrapped around the seam of the next eyelet hole.

FIG. 9 is a side view of a looper base used in a conventional eyelet buttonhole sewing machine.

FIG. 10 is a front view of a looper base used in a conventional eyelet buttonholing machine.

FIG. 11 is a top view of a looper base used in a conventional eyelet buttonhole sewing machine.

FIG. 12 is a view showing a sewing operation of a conventional eyelet buttonholing machine, (a) showing a stitch completed state, and (b).
Shows a state in which the work cloth has moved to the origin, (c) shows a state in which the looper thread is held by the front surface of the needle plate and the looper thread pressing portion, and (d) shows the looper thread by the looper thread cutting mechanism. Shows a cut state, (e) shows a state in which the looper base has rotated to the sewing start position, and (f) shows
Indicates the state where sewing is started in the next eyelet hole, (h)
Shows a state in which the cut looper thread end protrudes from the seam start position of the next eyelet hole.

FIG. 13 is a diagram for explaining a seam in an eyelet hole.

[Explanation of symbols] 4 Sewing machine main body 7 Sewing needle 8 Needle bar 17 Looper base 25 Feeder 49 Looper thread cutting mechanism 57 Looper thread retainer 57b Looper thread retainer 62 Throat plate 62a Guide groove

Claims (1)

[Claims] 1. A feed plate on which a work cloth provided on the upper surface of a bed is set, and a feed for moving the feed plate along the cut shape of eyelet holes formed in the work cloth. A device, a needle bar provided with a sewing needle on an arm part, a looper base provided with a looper provided on the bed part so as to face the needle bar, and a needle plate provided on the upper part of the looper base and having a needle hole In the eyelet buttonhole sewing machine, which is provided on the looper base and includes a thread pressing portion that holds the looper thread together with the needle plate end portion, and a cutting portion that cuts the looper thread pressed by the thread pressing portion, After forming a seam on the work cloth in the rear part of the needle plate,
When the work cloth is moved to the origin by the feeding device, a guide groove for guiding the looper thread from the last stitch to the needle hole is provided, and the thread pressing portion is arranged in the vicinity of the guide groove. An eyelet hole characterized in that the looper thread end cut by the cutting section at the rear part is wound into the next stitch by moving the work cloth by the feeding device in order to form the next stitch. Overlock sewing machine.