JP3594705B2 - Sewing core guide device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a core string guide device of a sewing machine, and particularly when sewing a core string into a seam when sewing a hole or the like on a sewing object having a different thickness or a stepped object. The present invention relates to a suitable core string guiding device for a sewing machine.
[0002]
[Prior art]
As shown in FIGS. 3 to 5, the core string guide device of the conventional sewing machine includes a holding support portion 28 provided on a side surface of a distal end portion of a holding arm 12 rotatably provided on a sewing machine main body (not shown). Are rotatably supported by support pins 13x. At both ends of the presser supporting portion 28, fixing portions 29 extending downward to fix the pins 30 supporting the cloth presser member 3 are formed. The pin 30 fixed to the fixing portion 29 supports a cloth pressing member 3 that stably presses a sewn product, here, the cloth 4. The cloth presser member 3 is formed with a needle through hole 5 through which the needle 1 supported by the needle bar 2 for sewing moves when the needle 1 moves in the vertical direction. A press receiving portion 31 is formed on the upper surface of the press supporting portion 28 and extends toward the upper surface of the distal end portion of the press arm 12, and the press roller 14 is fitted on the upper surface of the press receiving portion 31. A roller groove 15 for sliding is formed. The pressing roller 14 fitted in the roller groove 15 transmits a pressing force required to press the cloth 4 by a spring mechanism (not shown) to the cloth pressing member 3 via the pressing support portion 28. On the side surface of the pressing roller 14, a pin grip portion 34 for holding the pressing displacement transmitting pin 19 for transmitting the displacement amount of the cloth pressing member 3 to a core string guide rod 27 described later is formed. The pressing displacement transmitting pin 19 gripped by the pin gripping portion 34 is implanted at one end of the core string guide arm 32 and moves according to the movement of the pressing roller 14. The core string guide arm 32 has a substantially U-shaped bent shape, and is fixed to the support arm 33 at one bent portion. At the other end of the core string guide arm 32, a core string guide support rod 25 for supporting the core string guide rod 27 is fitted. A guide through hole 26 penetrating in the direction is formed, and the core string guide rod 27 is inserted into the guide through hole 26. The lower end portion of the core string guide rod 27 is formed in a hook shape, so that the core string can be easily led out in order to sew the core string into the seam at the time of forming the hole stitch. On the other hand, the support arm 33 supporting the core string guide arm 32 is rotatable about a support pin 13y shown in FIG.
[0003]
Next, the operation of such a conventional core string guide device of a sewing machine will be described. In a case where hole sewing is performed on a flat cloth 4, the pressing roller 14 is pushed downward by a spring mechanism (not shown). Then, the cloth presser member 3 stably presses the cloth 4 by the rotation of the presser arm 12 via the presser support section 28. Then, the needle bar 2 supporting the needle 1 moves up and down and oscillates in a direction perpendicular to the stitching direction, and the cloth pressing member 3 clamps the cloth 4 together with a cloth support (not shown). The cloth 4 is reciprocated in the stitching direction to perform hole-stitching. At this time, the core string guide rod 27 derives the core string and sew the core string into the seam.
[0004]
Further, when the hole 4 is formed on the cloths 4 having different thicknesses, the cloth pressing member 3 moves up and down in accordance with the thickness of the cloth 4 by the rotation of the pressing arm 12. On the other hand, the core string guide rod 27 is moved up and down by the vertical movement of the cloth pressing member 3, and the pressing roller 14 is moved up and down via the pressing displacement transmitting pin 19 gripped by the pressing roller 14. Thus, the core string guide arm 32 rotates about the support pin 13y of the support arm 33 as a fulcrum. Therefore, as shown in FIG. 4, the core string guide rod 27 supported by the core string guide support rod 25 fitted to one end of the core string guide arm 32 connects the support pin 13y of the support arm 33 to the support pin 13y. The core string guide rod 27 derives the core string and sew it into the seam while rotating as a fulcrum so as to keep the distance to the cloth pressing member 3 constant.
[0005]
Further, when the hole 4 is to be formed on the cloth 4 having a step, the cloth pressing member 3 and the press supporting section 28 rotate around the support pin 13x as a fulcrum, and are inclined according to the inclination of the step. Then, the cloth 4 is stably pressed. In order to form a hole stitch, the presser arm 12 having the cloth presser member 3 disposed at the distal end is moved in the stitch direction (in the direction of arrow C in FIG. 5) with the operation of the needle 1 described above. ), The pressing roller 14 applying the pressing force to the cloth pressing member 3 can move only in the vertical direction. Therefore, as shown in FIG. The roller groove 15 formed on the upper surface of the press receiving portion 31 of 28 is slid. On the other hand, the core string guide rod 27 rotates with the support pin 13y of the support arm 33 as a fulcrum via the presser displacement transmitting pin 19 and the like in accordance with the change of the cloth presser member 3 in the vertical direction. The distance between the cloth pressing member 3 and the core string guide rod 27 is kept constant, and the core string guide rod 27 derives the core string and sews the core string into the seam.
[0006]
[Problems to be solved by the invention]
However, in the conventional core string guide device of the sewing machine, when sewing is performed on cloths 4 having different thicknesses, the core string guide rod 27 is moved by the vertical movement of the cloth pressing member 3. The support arm 33 rotates around the support pin 13y to maintain a constant distance from the cloth pressing member 3, while the core string guide rod 27 also moves in the direction in which the needle 1 exists. This may cause the needle 1 to abut. Further, there was a case where the core string could not be sewn properly into the seam due to a change in the distance between the needle 1 and the core string guide rod 27. For this reason, it is necessary to adjust the position of the core string guide bar 27 each time according to the thickness of the cloth, and there is a problem that efficiency is low. Further, since the pressing roller 14 slides on the pressing receiving portion 31, that is, the pressing force of the pressing member 3 pressing the cloth 4 changes with the movement of the pressing arm 12 in the C direction, the And so on.
[0007]
The present invention has been made in view of such a problem, and even in the case of sewing a sewn object having a different thickness or a sewn object having a step, the cloth holding member and the needle, the core string guide arm and It is an object of the present invention to provide a core string guide device of a sewing machine that can hold the distance of the core string at a constant distance and reliably sew the core string into the seam.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the core string guide device according to claim 1 of the present invention is a presser displacement transmitting section for transmitting a displacement of a height and a tilt of the cloth presser member to be sewn to the core string guide section. Is a restricting member that moves only in the vertical direction in accordance with a change in the pressing height and the pressing inclination of the presser member, and the core string guide portion connected to the presser displacement transmitting portion includes the presser member and the needle. Is maintained at a constant distance, and the core string is led out so that the core string is reliably sewn into the seam.
[0009]
According to a second aspect of the present invention, in the core string guide device of the sewing machine, the pressing displacement receiving portion is disposed at a position facing the cloth pressing member, and these are moved while always maintaining a parallel positional relationship. Rotatably connected by two links, so that the presser member and the presser displacement receiving portion always have the same inclination, and the presser displacement receiving portion controls the displacement of the height and the inclination of the presser member. It is designed to reliably receive and transmit the displacement to the core string guide.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a core string guide device of a sewing machine according to the present invention will be described with reference to FIGS.
[0011]
In FIG. 1, the sewing machine is driven through a start / stop mechanism (not shown) by a start operation of the sewing machine, and by this drive, a needle bar 2 supporting a needle 1 at a lower end moves up and down at a fixed position, and moves in the left-right direction. And the cloth feed mechanism such as the cloth presser member 3 reciprocates the cloth 4 in a direction orthogonal to the swinging direction of the needle 1 to form a sewing, and in particular, forms a buttonhole overlock seam. Have been to be. When forming the stitches, the cloth pressing member 3 stably presses the material to be sewn, in particular, the cloth 4 in this case, and intersects with a cloth support (not shown) provided on a bed (not shown). The cloth 4 is reciprocated in the direction of arrow C in FIG. 1 in conjunction with the cycle operation of the sewing machine with the cloth 4 interposed therebetween. A needle through hole 5 that is long in the direction of arrow C is formed in the cloth holding member 3. A parallel four-node link mechanism constituted by four links is connected to the cloth holding member 3 by a spherical pin 11 having a spherical portion. The four links of the parallel four-joint link mechanism are configured such that each link is rotatable by a holding support plate 6, a front holding link 7, a rear holding link 8, and a link connecting plate 9, respectively. The pressing support plate 6 and the link connecting plate 9 face each other, and the front pressing link 7 and the rear pressing link 8 are provided at positions facing each other. Are connected so as to have the same distance from each other, and are always moved while maintaining a parallel positional relationship. Therefore, when the presser support plate 6 is connected to the cloth presser member 3 described later and tilts with the inclination of the cloth presser member 3, the inclination is changed via the front presser link 7 and the rear presser link 8 to the link. The link connection plate 9 is transmitted to the connection plate 9, and the link connection plate 9 is also inclined so as to have the same inclination angle. I have.
[0012]
Further, the presser support plate 6 has a support portion 10 extending downward from both ends and having a lower end formed in a planar shape. In this support portion 10, the cloth presser member 3 is held by the spherical pin 11. Are linked. For this reason, even if the cloth 4 has a step, the cloth pressing member 3 can be inclined freely by the spherical pin 11 so as to conform to the shape of the cloth 4 and press the cloth 4 reliably. It has become. The holding support plate 6 has its center in the longitudinal direction supported by a support pin 13a on the side surface of the distal end of the holding arm 12. The holding support plate 6 is rotated about the support pin 13a while being rotated. The support pin 13a receives a pressing force of a pressing roller 14 described later and transmits the pressing force to the cloth pressing member 3. The presser arm 12 is rotatably supported by a feed arm 16 by a support pin 13c, and the feed arm 16 is reciprocated in the direction of arrow C in FIG. 1 by a feed mechanism (not shown). A roller groove 15 into which the pressing roller 14 is fitted is formed linearly in the longitudinal direction on the upper surface of the distal end of the pressing arm 12 where the pressing support plate 6 is disposed. The pressing roller 14 is a component that applies a pressing force to the cloth pressing member 3 via the support pin 13a by the elastic force of a spring mechanism (not shown), and is used to move the pressing arm 12 in the direction of arrow C. As a result, it rotates according to the roller groove 15.
[0013]
The feed arm 16 is provided with a presser height link 17 that rotates with the turning operation of the presser arm 12, that is, with the vertical displacement of the cloth presser member 3, and a support pin 13d. Are supported so as to be rotatable around the center. The free end of the holding height link 17 is bent downward, and the link connecting plate 9 is rotatably supported at the lower end thereof by a support pin 13b at the center in the longitudinal direction. For this reason, when the presser support plate 6 is moved in the vertical direction by the rotation of the presser arm 12, the link connecting plate 9 is also displaced by the rotation of the presser height link 17 and the displacement amount of the presser support plate 6. It moves up and down by the same amount of displacement, and receives the height displacement of the presser foot member 3. Further, since both the presser height link 17 and the presser arm 12 are rotatably disposed on the feeder arm 16, the feeder arm 16 moves in the direction C in FIG. It is designed to move together.
[0014]
On the upper surface of the link connecting plate 9, a pressing displacement transmitting plate 18 extending in a direction perpendicular to the upper surface is formed, the upper surface of the pressing displacement transmitting plate 18 is a flat surface, and the upper surface is A presser displacement transmitting pin 19 for transmitting a displacement amount of the cloth presser member 3 in a vertical direction indicated by an arrow A in FIG. 1 to a core string guide rod 27 described later is slidably provided. The holding displacement transmitting pin 19 is implanted in a sliding arm 20 which is a regulating member which is slidable only in the vertical direction indicated by an arrow B in FIG. 1, and the sliding arm 20 is a sewing machine main body (not shown). By being supported by the step screw 22 screwed to the slide support plate 21 connected to the slide support plate 21, it is regulated so as to slide only in the up and down direction (the direction of arrow B). For this reason, the pressing displacement transmitting pin 19 is also restrained so as to be movable only in the vertical direction. Further, the slide arm 20 and the slide support plate 21 are also connected by an elastic member 23 such as a spring or rubber that urges the slide arm 20 in the vertical direction. The pressing displacement transmitting pin 19 is pressed against the upper surface of the pressing displacement transmitting plate 18 of the link connecting plate 9. For this reason, the pressing displacement transmitting pin 19 is configured to reliably transmit the vertical displacement of the pressing displacement transmitting plate 18 to the slide arm 20. A pin groove is formed on the side surface of the pressing displacement transmitting plate 18 without using the elastic member 23, and the pressing displacement transmitting pin 19 is slidably fitted into the pin groove to form the pressing displacement transmitting plate 18. May be reliably received by the presser displacement transmitting pin 19.
[0015]
The displacement amount of the cloth pressing member 3 received by the link connecting plate 9, which is the pressing displacement receiving portion, is transmitted to the core string guide rod 27 by the pressing displacement transmitting pin 19, the slide arm 20 and the slide supporting plate 21. The pressing displacement transmitting portion is formed.
[0016]
At the lower end of the slide arm 20, there is formed a slide bent portion 24 extending in a direction orthogonal to the slide arm 20, and a tip portion of the slide bent portion 24 has a substantially L-shape. The core string guide support bar 25 is fixedly held. A guide through hole 26 penetrating in a horizontal direction orthogonal to the direction of arrow C is formed on a side surface of the core string guide support rod 25, and the core string is stitched with a sewing thread in the guide through hole 26. A core string guide bar 27 serving as a core string guide arm for sewn into the inside is inserted. The core string guide rod 27 is formed in a tubular shape with its tip protruding so as to approach the needle 1, and converts the amplitude of the needle 1 into a baseline so that it always precedes the needle 1 in the stitch formation progressing direction. The position is changed by a conversion mechanism (not shown) at the time of rotation and at the time of reversing the traveling direction of the stitch.
[0017]
Therefore, when the cloth presser member 3 moves up and down in accordance with the shape and step of the cloth 4, the displacement of the cloth presser member 3 is controlled by the presser of the link connecting plate 9 via the parallel four-node link mechanism. When transmitted to the displacement transmission plate 18 and further transmitted by the holding displacement transmission pin 19 to the slide arm 20, it is inserted into the core string guide support rod 25 gripped by the slide bent portion 24 of the slide arm 20. This is transmitted to the core string guide rod 27, and the core string guide rod 27 is regulated by the slide arm 20 so as to move only in the vertical direction by the same displacement as the cloth pressing member 3. The distance from the needle 1 is kept constant.
[0018]
Next, an operation of the embodiment of the core string guide device of the sewing machine of the present invention will be described.
[0019]
When sewing a hole on a normal flat cloth 4, the cloth pressing member 3 receives the pressing force from above by the pressing roller 14 with the support pin 13 a, and the supporting pin of the pressing arm 12 The cloth 4 is stably pressed by the rotation operation around 13c. The needle bar 2 supporting the needle 1 moves up and down and oscillates in the left-right direction with respect to the cloth 4 by the operation of a start / stop mechanism (not shown), and the cloth pressing member 3 presses the cloth 4 while pressing the cloth 4. The button 4 is sewn by sewn the cloth 4 in the direction of arrow C in FIG. 1 while holding the cloth 4 together with a cloth support (not shown). At this time, the core string guide rod 27 is led out so as to sew the core string into the seam while maintaining a certain distance from the cloth pressing member 3 and the needle 1.
[0020]
Then, when the thickness of the cloth 4 to be sewn changes, the cloth pressing member 3 rotates vertically about the support pin 13c of the pressing arm 12 (in the direction of arrow A in FIG. 1). ), The link connecting plate 9 moves in the vertical direction by the same displacement amount as the cloth presser member 3 by the rotation of the presser height link 17 via the parallel 4-bar link mechanism. When the link connecting plate 9 moves in the vertical direction, the pressing displacement transmitting pins 19 provided on the upper surface of the pressing displacement transmitting plate 18 of the link connecting plate 9 also move in the vertical direction. The slide arm 20 moves up and down (in the direction of arrow B in FIG. 1) in conjunction with. When the slide arm 20, which is a regulating member, moves in the vertical direction, the core string guide rod 27 inserted in the core string guide support rod 25 held by the slide bending portion 24 moves in the vertical direction. Therefore, the cloth presser member 3 and the core string guide bar 27 move by the same amount in the vertical direction. Further, since the core string guide rod 27 is regulated so as to be able to move only in the vertical direction, it does not move in the direction approaching the needle 1 and the distance between the core string guide rod 27 and the needle 1 is constant. Will be kept.
[0021]
In the case where the cloth 4 to be sewn is a cloth 4 having a step, as shown in FIG. 2, the cloth pressing member 3 moves the cloth 4 about a support pin 13a of the pressing support plate 6 as a center. Incline to match the step. The inclination of the cloth pressing member 3 is transmitted to the link connecting plate 9 via the front pressing link 7 and the rear pressing link 8, and the link connecting plate 9 is also inclined at the same inclination angle. In this state, the cloth presser member 3 is stably pressing the cloth 4, the needle bar 2 moves vertically and oscillates in the left and right directions, and further, in order to form a hole stitch. The feed arm 16 moves in the direction of arrow C in FIG. 1, and the presser arm 12 and the presser height link 17 supported by the feed arm 16 move in the direction of arrow C, The cloth presser member 3 arranged reciprocates the cloth 4 in the direction of arrow C to perform sewing. At this time, the core string guide rod 27 does not move in the direction of arrow C, but moves in the up and down direction, so that the pressing displacement transmitting plate 18 of the link connecting plate 9 moves in the direction of arrow C while tilting. In response to this, the pressing displacement transmitting pin 19 moves up and down, and as shown in FIG. 5, the pressing displacement transmitting pin 19 relatively slides on the pressing displacement transmitting plate 18. Become. With the vertical movement of the pressing displacement transmitting pin 19, the core string guide rod 27 also moves in the vertical direction by the same displacement as the pressing displacement transmitting pin 19. Therefore, the distance between the core string guide bar 27 and the cloth holding member 3 is kept constant, and the distance between the core string guide bar 27 and the needle 1 is also kept constant.
[0022]
As described above, in the embodiment of the core string guide device of the sewing machine of the present invention, in order to stably press the cloth 4 having a different thickness or the cloth 4 having the step portion, the cloth pressing member 3 is provided. Even if the core string guide bar 27 moves up and down or is inclined, the core string guide rod 27 can maintain the distance between the cloth presser member 3 and the needle 1 at a constant distance. It is possible to maintain an optimal position for sewn the inside, and it does not come into contact with the needle 1. In addition, the position of the core string guide bar 27 does not need to be corrected each time depending on the thickness of the cloth 4, which is efficient.
[0023]
Further, the pressing force with which the cloth press presses the cloth 4 is applied only by one fulcrum of a support pin 13a that supports the presser arm 12 by the pressing roller 14 that slides on the upper surface of the presser arm 12 through the presser support plate 6. Since the pressing force is transmitted, even if the cloth pressing member 3 presses the cloth 4 while being inclined, the pressing force does not become uneven at each part of the cloth pressing member 3 and any sewing or the like is generated. The sewing can be performed with a good finish without the need.
[0024]
Note that the present invention is not limited to the above-described embodiment, and can be variously modified as needed.
[0025]
【The invention's effect】
As described above, the core string guide device of the sewing machine according to the present invention has a structure in which the core string guide arm has the cloth holding member and the needle even when sewing a sewing object having a different thickness or a stepped object. With this arrangement, the core string is led out while maintaining a constant distance from the core string, and the core string can be reliably sewn into the seam.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a core string guide device of a sewing machine according to the present invention. FIG. 2 is a front view of a main part of FIG. 1 when sewing a workpiece having a step. FIG. FIG. 4 is a front view of a main part of FIG. 3; FIG. 5 is a front view of a main part of FIG. 3 when sewing a workpiece having a step;
DESCRIPTION OF REFERENCE NUMERALS 1 needle 3 cloth presser member 6 presser support plate 7 front presser link 8 rear presser link 9 link connecting plate 12 presser arm 18 presser displacement transmitting plate 19 presser displacement transmitting pin 20 slide arm 25 guide support rod 27 core string guide rod

Claims (2)

The cloth holding member is connected to a cloth presser member that presses the work and reciprocates the work in response to the drive of the sewing machine. A pressing displacement receiving portion that moves up and down by the same displacement amount and is inclined at the same inclination angle, and a pressing displacement transmitting portion that is engaged with the pressing displacement receiving portion and moves in the vertical direction with the movement of the pressing displacement receiving portion. And a core string guide that is connected to the presser displacement transmitting section and moves by the same amount of displacement as the presser displacement transmitting section to guide the core string so as to be sewn into the stitch. And a regulating member that moves only in the vertical direction in accordance with a change in a pressing height and a pressing inclination of the cloth pressing member. The presser displacement receiving portion is disposed at a position facing the cloth presser member, and these are rotatably connected by two links that move while always maintaining a parallel positional relationship. The core string guide device for a sewing machine according to claim 1, wherein the pressing displacement receiving portion has the same inclination.

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