JP3445658B2 - Eyelet hole drilling machine core thread feeding device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet boring sewing machine in which a core thread is sewn into a seam, and when the core thread is cut after completion of overlock stitching, the core thread is pulled from the seam side. The present invention relates to a core yarn feeding device for a eyelet buttonholing sewing machine, which is capable of preventing deformation of a seam caused by being punctured.

[0002]

2. Description of the Related Art An eyelet buttonhole sewing machine for sewing eyelet holes formed in a work cloth in advance or afterward generally has the following basic structure. That is, the needle bar provided with the sewing needle at the lower end of the sewing machine frame has a needle bar vertically moved by the needle bar up-and-down driving mechanism, and the feed table on which the work cloth is set is set by the feeding device to the eyelet hole. A feed drive is provided along the cut shape. Also, the needle drop mechanism provided on the arm portion allows the needle drop point of the sewing needle to be swung right and left for each stitch. Along with the vertical movement and needle swing of the needle bar, the looper drive mechanism provided in the bed portion operates the looper, and the cooperation of the two allows overlock stitching along the eyelet hole. In addition, in the bed part,
A cutter device consisting of a lower knife and a hammer is provided,
As a result, eyelet holes are cut into the work cloth at a required timing.

In this eyelet buttonhole sewing machine, a core thread guide mechanism is provided in the vicinity of the looper, and the core thread drawn from a thread supply source is led out between the left and right needle drop points of the sewing needle, The core thread is sewn into the seams to reinforce the seams. Further, the feed table of the sewing machine is provided with a cutting device for cutting the bobbin thread and the core thread after the completion of overlock stitching. This cutting device is provided with a fixed knife and a movable knife on both sides that sandwich the lower thread and the core thread facing between the looper and the core thread guide mechanism, and the end of the seam formed along the eyelet hole in the work cloth. . Then, in the process of moving the movable knife close to the fixed knife by the drive mechanism, the movable knife captures the lower thread and the core thread, and cuts both threads by bringing the movable knife into contact with the fixed knife. Configured to do so.

[0004]

When the bobbin thread and the core thread are cut by the above cutting device, when the both threads caught by the movable knife are moved to the position where they come into contact with the fixed knife, The required tension is added. As described above, the core thread is simply sewn into the seam, and the resistance is greater on the thread supply path side from the thread supply source to the core thread guide mechanism. Was to be pulled. In this case, it is pointed out that when the core yarn is pulled, the seam in the eyelet portion is deformed so that it is distorted to one side, and a beautiful seam cannot be provided.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the cutting of the core yarn, and it has been proposed that the required amount should be drawn in advance from the yarn supply source. By feeding the core thread to the cutting portion when the core thread is cut, it is possible to prevent the core thread from being pulled from the stitch side and deforming the stitch shape, and always obtain a beautiful stitch. The purpose is to provide means.

[0006]

In order to overcome the above problems and achieve the intended purpose, the present invention is provided with a sewing needle at the lower end,
A needle bar that is vertically movable on the arm section, a needle bar up-and-down drive mechanism that drives the needle bar up and down, a feed table that is provided on the upper surface of the bed section, on which the work cloth is set, and the work cloth A feed mechanism that gives a feed operation to this feed base in accordance with the eyelet hole shape, a looper that is provided in the bed portion, forms a stitch on the work cloth in cooperation with the sewing needle, and is close to the looper. A core thread guide mechanism that is provided on the feed table and guides the core thread drawn out from the thread supply source so that the core thread is sewn into the seam, and the end of the seam that is formed along the eyelet hole shape. And a cutting device for cutting the core yarn facing between the core yarn guide mechanism, and a cutter device provided in the bed portion for cutting eyelet holes in the work cloth at a required timing ,
A thread supply path from the thread supply source of the core thread to the core thread guide mechanism
And a core thread puller capable of pulling out the core thread from a thread supply source.
It is provided on the feeding means and the feed table, and the feed table is at the origin position.
The core thread withdrawing means when returning to the
It consists of a working member for actuating the, by said feed mechanism
When the feed base is moved from the origin position to the sewing start position,
, Move according to the eyelet hole shape and form seams on the work cloth
After that, the feed table is returned to the original position again.
To cut the core yarn by the cutting device,
At the time of cutting the core yarn, the core yarn drawing means is used to supply the yarn
In an eyelet buttonhole sewing machine configured to be able to feed out a core yarn drawn in advance to a cutting portion from the core yarn drawing means,
A core yarn is rotatably and pivotally supported by the arm portion, and is supplied from a yarn supply source.
A core yarn that can be engaged with the core yarn that faces the yarn supply path leading to the guide mechanism
The lever is pivotally supported by the take-off lever and the arm,
It can be freely engaged and disengaged with the core thread take-up lever,
When moving, the actuating member is engaged and can be rotated in the required direction.
It consists of a moving member and moves from the origin position to the sewing start position.
When the operating member of the moving feed table is engaged with the movable member,
The movable member rotates independently with respect to the core thread take-up lever,
The operating member of the feed table that returns to the point position engages with the movable member.
And when the movable member is engaged with the core thread take-up lever integrally
It is characterized in that it is configured to pivotally move .

[0007]

With the eyelet buttonhole sewing machine, after the feed table has moved from the origin position to the sewing start position, the feed table is given a feed operation according to the shape of the eyelet hole, and the needle bar is moved up and down and the needle is swung. At the same time, by operating the looper provided in the bed portion, overlock stitching is performed along the eyelet holes. When the overlock stitching is completed and the feed table is returned to the original position, the operating member arranged on the feed table operates the core thread withdrawing means, and the required amount of the core thread is drawn from the thread supply source. When the feed table reaches the original position and the cutting device cuts the core yarn, the required amount of the core yarn previously drawn by the core yarn drawing means is fed to the cutting portion.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a core yarn feeding device for an eyelet buttonhole sewing machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. (1) Overall structure of eyelet buttonhole sewing machine The eyelet buttonhole sewing machine in which the core yarn feeding device of the present application is implemented basically has the following structure. That is, in FIG. 2, the sewing machine frame 10 is composed of a bed portion 12 having a substantially rectangular box shape and an arm portion 14 extending upward and forward from the depth direction of the bed portion 12. The frame 10 is a sewing machine motor (see FIG. Sewing machine table 16 with (not shown) attached
It is placed on top. A needle bar 20 having a sewing needle 18 at a lower end thereof is arranged on the front head portion of the arm portion 14 so as to be vertically movable and to be able to perform a left and right needle swing motion for each needle. The needle bar 20 is vertically driven by a needle bar vertical drive mechanism (not shown) arranged in the arm portion 14. The bed 12 has two loopers 2 located directly below the needle bar 20.
Two are provided. These loopers 22 are needle bars 2
It operates in synchronism with the vertical movement of 0 and the needle swinging motion, thereby forming a stitch on the work cloth 26 placed on the feed table 24 (described later) in cooperation with the sewing needle 18. A core thread guide mechanism (not shown) that guides the core thread 34 drawn from the thread supply source between the left and right needle swing positions of the sewing needle 18 is arranged near the looper 22. It is configured to reinforce the seam by stitching it in the seam. Furthermore, bed section 1
2 includes a lower knife 28 located on the depth side of the looper 22.
And a cutter device 32 including a hammer 30 that comes in contact with and separates from the lower knife 28 from above.
By operating No. 2 at a required timing, an eyelet hole having a round hole portion and a straight portion can be cut into the work cloth 26.

A work cloth 26 is provided on the upper surface of the bed portion 12.
Is provided with a feed table 24 on which the work cloth 26 is pressed on both sides of the cut.
(Not shown) is provided. The feed table 24 is in the form of a thin rectangular box as a whole, and is driven by a feed device having two pulse motors (not shown) to move in the X direction (left-right direction) and the Y direction (front-back direction) orthogonal to each other. It is possible. The feed table 24 is positioned at the origin position, and the work cloth 26 placed on the upper surface thereof.
Above and below the planned eyelet hole formation position in the lower knife 2
8 and the hammer 30 are set to face each other. After the eyelet holes are formed in the work cloth 26 by the cutter device 32, the feed base 24 is moved to the sewing start position in front of the origin position by the operation of the start switch (not shown), and is formed on the work cloth 26. It is set to move along the cut shape of the eyelet hole. As a result, the work cloth 26 placed on the feed table 24 can be moved to a required position immediately below the sewing needle 18, and the overedge stitch can be sequentially applied to the cut edge portion of the eyelet hole.

The feed table 24 is provided with a cutting device 37 for cutting the lower thread (not shown) and the core thread 34 after the overedging is completed. This cutting device 37 is movable with a fixed knife on both sides sandwiching the lower thread and the core thread 34 facing the looper 22 and the core thread guide mechanism, and the end of the stitch formed along the eyelet hole in the work cloth 26. With a scalpel. Then, in the process of moving the movable knife close to the fixed knife by the drive mechanism, the movable knife captures the lower thread and the core thread, and cuts both threads by bringing the movable knife into contact with the fixed knife. Is configured to.

(2) Regarding the core yarn feeding device The eyelet buttonhole sewing machine according to this embodiment is provided with the core yarn feeding device 38 having the structure shown in FIG. That is, the core yarn 3 drawn from the yarn supply source is provided on one side surface of the arm portion 14.
4. A fixed guide member 40 having a through hole 40a through which 4 is inserted.
Is fixed and the support plate 42 is fixed by a required distance from the position where the fixed guide member 40 is arranged. The support plate 42 has a bent portion 42b that is bent outward and is separated from the arm portion 14 at one longitudinal end of a main body 42a that is screwed to the arm portion 14. A holding portion 42c is formed at the tip end, which is parallel to the main body 42a and extends to the opposite side. A fixed guide portion 44 is formed at an end of the holding portion 42c that faces the fixed guide member 40, and a through hole 44a bored in the fixed guide portion 44 is inserted into the through hole 40a of the fixed guide member 40. A thread 34 is inserted, and the core thread 34 is supplied to the core thread guide mechanism via a tubular guide tool 46 shown in FIG.

The support shaft 4 is attached to the holding portion 42c of the support plate 42.
8 is provided, and at the end of the support shaft 48 that protrudes to the back surface side of the holding portion 42c (the side that faces the arm portion 14),
A core thread take-up lever 50 is rotatably supported. The core thread take-up lever 50 has a first extending portion 50a extending forward from the support shaft 48 (on the front side of the sewing machine) as shown in FIG.
It is set so as to face a standby position in which the main body 42a of the support plate 42 is abutted from below. That is, the core thread removing lever 50
Is always a torsion spring attached to the lever 50.
It is held at the standby position by the action of (not shown), and rotation from the standby position in the counterclockwise direction is prevented, but rotation from the standby position in the clockwise direction is allowed. There is. At the tip of the arm 50b extending rearward from the support shaft 48 of the core thread take-up lever 50, the fixed guide member 4 is provided.
The guide portion 52 is bent and formed so as to face between 0 and the fixed guide portion 44 of the support plate 42. The core yarn 3 inserted through the through hole 40a of the fixed guide member 40 and the through hole 44a of the fixed guide portion 44 is inserted into the through hole 52a formed in the guide portion 52.
4 is inserted.

A movable member 54 is rotatably supported by an end portion of a support shaft 48 projecting to the surface side of the holding portion 42c of the support plate 42. The movable member 54 has a core thread take-up lever 50. An engaging / disengaging restricting piece 54a is formed on the front side of the second extending portion 50c extending downward. In addition, the arm 50b of the core thread removing lever 50 and the movable member 54
A tension spring 56 is stretched between the two and 50, 54 in a state in which both springs 50, 54 are urged by the spring 56, the restricting piece 54a engages with the second extending portion 50c, and its basic posture is stable. Is held (see FIG. 5). When the movable member 54 rotates clockwise around the support shaft 48, the core thread take-up lever 50 integrally rotates under the engagement action of the restriction piece 54a and the second extending portion 50c. But the movable member 5
When 4 rotates in the counterclockwise direction about the support shaft 48, the core thread take-up lever 50 does not rotate and remains facing the standby position (see FIGS. 4 and 6). Further, a roller 58 is provided so as to project from the surface side of the movable member 54, and an operating arm 36 (described later) arranged on the feed base 24 can be engaged with the roller 58.

As shown in FIG. 2, the feed table 26 is provided with an operating arm 36 extending rearward on the side of the arm portion 14 where the movable member 54 is provided, and formed at the free end of the arm 36. The engaging portion 36 a is adapted to engage with and separate from the roller 58 of the movable member 54 as the feed table 26 moves. That is, the engagement portion 36a of the operation arm 36 is separated rearward from the roller 58 of the movable member 54 facing the standby position in the basic posture, as shown in FIG. 3, when the feed base 26 faces the origin position. And is facing. Then, in the process in which the feed base 24 moves from the origin position to the sewing start position, the engaging portion 36a engages with the roller 58 from the rear side, and the movable member 54 is rotated counterclockwise as shown in FIG. Is configured. When the engaging portion 36a is separated from the roller 58, the movable member 54 rotates clockwise under the elastic force of the tension spring 56 to return to the basic posture. Further, in the process of the feed table 24 returning from the sewing position to the original position, the engaging portion 36a engages the roller 58 from the front side, and the movable member 54 is integrated with the core thread take-up lever 50 as shown in FIG. It is configured to rotate clockwise. Then, at this time, the guide portion 52 of the core thread take-up lever 50 moves in a direction intersecting with the thread path of the core thread 34 connecting the fixed guide member 40 and the fixed guide portion 44, and thereby the required amount from the thread supply source. The core thread 34 is drawn out. When the feed base 24 reaches the origin position, the engaging portion 36a of the operating arm 36 is
Is separated from the roller 58, the movable member 54 and the core thread take-up lever 50 return to the standby position by the action of the torsion spring in the basic posture, and the required amount of the core thread 34 is stored in a loose state ( (See FIG. 7).

[0015]

Next, the operation of the core yarn feeding device according to the embodiment will be described. In the feed table 24 facing the origin position, the engaging portion 36a of the operating arm 36 faces the rear of the movable member 54 facing the standby position, which is separated from the roller 58, as shown in FIGS. Therefore, the core thread 34 inserted through the through hole 40a of the fixed guide member 40, the through hole 52a of the core thread removing lever 50, and the through hole 44a of the support plate 42 is guided by the tubular guide tool 46 in a stretched state. There is.

A work cloth 26 is set on the feed table 24,
When the cutter device 32 is operated, an eyelet hole including a round hole portion and a linear portion is cut and formed in the work cloth 26. Next, when you operate the start switch of the sewing machine,
The feed table 26 moves forward from the origin position to the sewing start position. At this time, the engaging portion 36a of the operating arm 36 disposed on the feed base 24 engages with the roller 58 of the movable member 54 from the rear, as shown in FIG. 4, whereby the movable member 54 moves counterclockwise. Rotate. As described above, since the movable member 54 can independently rotate in the counterclockwise direction with respect to the core thread take-up lever 50, the movable member 54 remains in the standby position at the core thread take-up lever 50. Only the chisel is rotated counterclockwise. Therefore, the core yarn 34 facing between the fixed guide member 40 and the fixed guide portion 44 is held in a tensioned state. When the engaging portion 36a of the actuating arm 36 separates from the roller 58, the movable member 54 moves to the tension spring 5
6 rotates clockwise under the urging action of 6, and returns to the reference posture in which the restricting piece 54a engages with the second extending portion 50c of the core thread take-up lever 50 (see FIG. 5).

When the feed table 24 is moved along the shape of the eyelet hole and the overedging is performed, and when the overedging is completed, the feed table 24 returns to the origin position. At this time, as shown in FIG. 6, the engaging portion 36a of the operating arm 36 disposed on the feed base 24 engages with the roller 58 of the movable member 54 from the front side, and the movable member 54 rotates clockwise. Move. By the clockwise rotation of the movable member 54, the core thread take-up lever 50 is also rotated clockwise together with the movable member 54, and the core thread 34 facing between the fixed guide member 40 and the fixed guide portion 44 is fixed to the arm 50b. Is pulled upwards through the guide portion 52 of the core, thereby allowing a corresponding amount of core yarn 3 from the yarn supply source.
4 is withdrawn. When the feed base 24 reaches the original position, the roller 58 is separated from the engaging portion 36a of the operating arm 36, and the core thread take-up lever 50 and the movable member 54 are rotated counterclockwise by the action of the torsion spring to move to the standby position. Return to. As a result, as shown in FIG. 7, a required amount of the core yarn 34 is stored in a loose state between the fixed guide member 40 and the fixed guide portion 44.

Next, when the movable knife of the cutting device 37 moves toward the fixed knife and catches the lower thread and the core thread 34 and pulls them to the position where the fixed knife is arranged, they are fixed to the fixed guide member 40. Core yarn 3 stored between the guide portion 44 and
4 is fed to the cutting section. That is, since the core thread 34 is not pulled from the seam side, it is possible to prevent the seam from being deformed, and it is possible to always obtain a beautiful seam.

[0019]

As described above, according to the core yarn feeding device of the eyelet boring machine according to the present invention, a required amount of the core yarn is drawn out from the yarn supply source immediately before the core yarn is cut. Since the core yarn can be fed to the cutting portion, it is possible to prevent the core yarn from being pulled from the stitch side when the core yarn is cut. Therefore, the seams are not deformed, and high quality and beautiful seams can be obtained. Further, since the core yarn is pulled out by the actuating member arranged on the feed base, it is not necessary to separately provide a driving mechanism or the like, and the cost can be suppressed at a low cost.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a main part of a core yarn feeding device according to an embodiment.

FIG. 2 is an overall side view showing a schematic configuration of an eyelet buttonholing machine in which a core yarn feeding device is implemented.

FIG. 3 is an explanatory diagram showing a state immediately before the feed table moves from the origin position to the sewing start position in the core yarn feeding device according to the embodiment.

FIG. 4 is an explanatory view showing a state in which only the movable member is rotated counterclockwise by moving the feed table from the origin position to the sewing start position in the core yarn feeding device according to the embodiment.

FIG. 5 is an explanatory diagram showing a state immediately before the feed table moves from the sewing position to the origin position in the core yarn feeding device according to the embodiment.

FIG. 6 is a view showing a core yarn delivering device according to an embodiment. When a feed base moves from a sewing position to an origin position, a core yarn take-up lever and a movable member are rotated in a clockwise direction to extract a core yarn from a yarn supply source. It is explanatory drawing which shows the state which is pulled out.

FIG. 7 is a diagram showing a core yarn delivering device according to an embodiment. When a feed table reaches an origin position, a core yarn take-up lever and a movable member return to a standby position and a required amount of core yarn is stored in a loose state. It is explanatory drawing which shows a state.

[Explanation of symbols]

12 beds 14 Arm 18 sewing needles 20 needle bars 22 Looper 24 sending stand 26 Work cloth 32 cutter device 34 core thread 36 Working Arm 37 Cutting device 40 Fixed guide member 44 Fixed guide 50 core thread take-up lever 52 Guide 54 Movable member

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-4-26438 (JP, A) JP-B 26-4886 (JP, B1) JP-B 47-27462 (JP, B1) US Patent 1877159 (US) , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (2)

(57) [Claims] 1. An arm portion (14) having a sewing needle (18) at a lower end thereof.
The needle bar (20) that can be moved up and down, the needle bar vertical drive mechanism that drives the needle bar (20) up and down, and the work cloth (26) that is installed on the upper surface of the bed (12). The feed table (24) and the feed table (24) according to the eyelet hole shape of the work cloth (26).
And a looper (22) provided on the bed portion (12) for forming a stitch on the work cloth (26) in cooperation with the sewing needle (18), and the looper ( 22), which is provided near the core thread guide mechanism that guides the core thread (34) drawn from the thread supply source so that it is sewn into the seam, and the feed table (24). A cutting device (37) for cutting the core thread (34) facing between the end of the stitch formed along the shape and the core thread guide mechanism, and the work cloth (37) provided in the bed section (12). 26) a cutter device (32) for cutting eyelet holes at a required timing, and a core yarn plan from the yarn supply source of the core yarn (34).
The core thread (34) is provided in the thread supply path leading to the internal mechanism and
A core yarn withdrawing means (50, 54) that can be withdrawn from a supply source, and
It is arranged on the feed base (24) and the feed base (24) returns to the origin position.
When pulling out the core yarn withdrawing means (50, 54)
The operating mechanism (36) that operates the
Move the feed table (24) from the origin position to the sewing start position.
The work cloth (26) by moving according to the eyelet hole shape.
After forming the stitches, return the feed base (24) to the original position again.
At this time, the core thread (34) is cut by the cutting device (37).
When cutting the core yarn (34) by the cutting device (37),
The core thread withdrawing means (50, 54) is used to withdraw from the thread supply source in advance.
In the eyelet buttonhole sewing machine configured such that the core yarn (34) can be fed to the cutting portion, the core yarn withdrawing means is rotatably supported by the arm portion (14) and is fed from a yarn supply source.
Engageable with the core thread (34) facing the thread supply path leading to the core thread guide mechanism.
Of the core thread take-up lever (50) and the arm portion (14) so as to be rotatable.
It can be freely engaged and disengaged with the lever (50), and the feed table (24) can be moved.
When operating, the operating member (36) is engaged and rotated in the required direction
It consists of a movable member (54) and is of a feed table (24) that moves from the origin position to the sewing start position.
When the actuating member (36) engages with the movable member (54),
The member (54) independently rotates with respect to the core thread take-up lever (50) ,
The moving member (36) of the feed base (24) that returns to the home position is the movable part.
When engaged with the material (54), the movable member (54)
Bar (50) and engaged with the core yarn feeding device of eyelet stitching machine, characterized by being configured to integrally rotate. 2. The arm portion (14) is provided with guide means (40, 44) for guiding the core thread (34) at a predetermined distance from each other, and the guide section (52) of the core thread take-up lever (50). ) Indicates both guide means (40,4
The movable member facing the core yarn (34) facing between
When the (54) and the core thread take-up lever (50) rotate integrally,
Both guide means (40, 44) while the guide portion (52) is engaged with the core yarn (34).
The core yarn feeding device of the eyelet buttonhole sewing machine according to claim 1 , wherein the core yarn feeding device is configured so as to move in a direction intersecting a yarn path connecting the two.