JP2003024664A - Needle swinging device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needle swinging device for a sewing machine, which suppresses vibration or noise during sewing, exactly forms stitches and can be miniaturized. SOLUTION: The needle swinging device (10) for the sewing machine is provided with a needle bar swinging stand (60) for vertically movably supporting a needle bar, a swinging means (70) for swinging the needle bar, a needle bar crank rod (20) circularly moving one end and linking the other end to the needle bar, a driving power transmitting means (50) for transmitting deriving power applied to the needle bar crank rod to the needle bar while permitting swinging of the needle bar, and first and second guiding means (30 and 40) for vertically guiding the other end of the needle bar crank rod at a position holding the rod between front and rear sides. Since the movement of the other end of the needle bar crank rod is guided from both the front and rear sides of the needle bar crank rod, the rotation or inclination of the needle bar crank rod is suppressed and the generation of vibration or noise during sewing operation can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle swinging device of a sewing machine that swings a needle bar while sliding the needle bar in the axial direction.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made for a needle swinging device 200 for a sewing machine, which is capable of vertically moving the needle bar in the axial direction and swinging the needle bar in the left-right direction to perform so-called zigzag stitching, hole stitching and the like. Has been done. For example, as shown in FIG. 7, in the needle swinging device 200 of the sewing machine disclosed in Japanese Unexamined Patent Publication No. 2000-229184, the upper end 201a of the needle bar connecting rod 201 is rotated with the rotation of the upper shaft 202 around its axis. It makes a circular motion along a circle C in a plane (in the vertical plane) orthogonal to the upper axis 202. Further, the rear portion of the lower end 201b of the needle bar continuous rod 201 is provided with a needle bar continuous rod guide 204 through a square piece 203.
Is vertically slidably guided along the vertical groove 204a of the needle bar, and the front portion of the lower end 201b of the needle bar connecting rod 201 is substantially left and right along the guide groove 206a of the needle bar holder 206 via the square piece 205. It is slidably guided in the direction.

A needle bar guide 209 having a vertically extending elongated hole 209a is provided on the side surface of a needle bar base 208 for swinging the needle bar 207. And needle bar 2
A protrusion 206b protruding from a side surface of the needle bar holder 206 that supports 07 is guided along the elongated hole 209a so as to be slidable in a substantially vertical direction. And the needle bar base 20
A lower end portion 208b of 8 is connected to a swing lever 212 that swings in the left-right direction around a swing shaft 211 via a square piece 210. The upper end portion of the needle bar base 208 is swingably supported by an arm (not shown) of the sewing machine.
In the needle swinging device 200 having such a structure, the upper shaft 2
The driving force transmitted from 02 to the needle bar continuous rod 201 is applied to the square piece 2
05 and the needle bar holder 206 to transmit to the needle bar 207,
The needle bar 207 can be moved vertically in the axial direction. Further, the driving force transmitted from the swing shaft 211 to the swing lever 212 can be transmitted to the needle bar base 208 via the square piece 210 to swing the needle bar 207. Then, by vertically moving and swinging the needle bar 207, it is possible to perform overhole sewing and the like.

[0004]

However, in the needle swinging device 200 of the sewing machine having the above-described structure, the square piece 203 can easily slide inside the vertical groove 204a of the needle bar continuous rod guide 204. In addition, as shown in FIG. 8 (A), a slight gap is provided between the left and right side surfaces of the square piece 203 and the left and right side surfaces of the vertical groove 204a. Therefore, the square piece 203 and the needle bar continuous rod 201 may rotate in the horizontal direction within a very small range on the horizontal plane, which may cause vibration and noise during the sewing operation.

Further, in order to smoothly move the upper end 201a of the needle rod connecting rod 201 along the circle C, a ball bearing is provided at the upper end 201a of the needle rod connecting rod 201, and the upper shaft 202 is provided. May be connected to the side. In such a case, due to the small amount of backlash inherent in the ball bearing structure, as shown in FIG. 8B, the needle bar connecting rod 201 and the square piece 203 are within a very small range in the front-rear direction. There was a case where it was tilted, which could cause vibration and noise during the sewing operation. In addition, in order to eliminate the problem when using such a ball bearing, for example, a highly accurate part such as a needle bearing may be used. In this case, the lubricating oil used for the needle bearing is being sewn during the sewing operation. There was a problem that it scatters around and there is no lubricant and seizure occurs. In addition, in order to prevent the needle bar continuous rod 201 and the square piece 203 from rotating in the left-right direction as described above, and to suppress vibration and noise during the sewing operation,
The left and right side surfaces of the vertical groove 204a and the left and right side surfaces of the square piece 203 may be long in the front-rear direction.
In this case, there is a problem that the needle bar continuous rod guide 204 becomes long in the front-rear direction, resulting in an increase in size of the entire sewing machine.

Further, in the needle swinging device of the sewing machine which has been conventionally used, the lower end 201b of the needle bar connecting rod 201 as shown in the above-mentioned needle swinging device 200 of the sewing machine is slid vertically or horizontally. Possible guiding members (204, 206)
The lower end 201b of the needle bar connecting rod 201 is directly connected to the needle bar holder 206, that is, the lower end 201 of the needle bar connecting rod 201 is not used.
A device in which b is directly connected to the needle bar holder 206 so as to be rotatable in a plane parallel to the swinging direction of the needle bar 207 is known. In the needle swinging device 300 of such a sewing machine,
As shown in FIG. 9, a rotary hook 301 that makes a circular motion in a clockwise direction.
The position of the lower end 201b of the needle bar connecting rod at the time when the sword tip 302 of the needle encounters the needle and catches the thread inserted in the needle is point P.
It changes as shown as 1, P2, P3.

Here, the position of the lower end 201b of the rod connecting rod increases as the sewing needle swings to the right. As described above, since the lower end 201b of the needle bar connecting rod is directly connected to the needle bar holder 206, the position of the sewing needle when the sword tip 302 meets the sewing needle also becomes higher as the sewing needle swings to the right. As described above, in the needle swinging device 300 of the conventional sewing machine, as a result of the difference in height between the points P1 and P3 becoming large, the sword tip 302 cannot catch the thread inserted into the sewing needle, and the stitch is not formed. there were.

In view of the above problems, it is an object of the present invention to provide a needle swinging device for a sewing machine, which suppresses vibration and noise during sewing, forms a seam accurately, and can be downsized. .

[0009]

In order to solve the above problems, a needle swinging device (80) for a sewing machine according to claim 1 has a needle bar (12) for slidably supporting the needle bar (12) in its axial direction. An oscillating base (60), an oscillating means (70) for oscillating the needle bar together with the needle bar oscillating base in a direction substantially orthogonal to the axial direction of the needle bar, and one end is supplied from a drive source. With the driving force to be circularly moved in the vertical plane parallel to the vertical plane,
Needle bar crank rod (20) having the other end interlocking with the needle bar
And the driving force applied to the other end of the needle bar crank rod from the drive source via the needle bar crank rod while suppressing the driving force from being transmitted to the needle bar in its swinging direction. A needle swinging device for a sewing machine, comprising: a driving force transmitting means (90) for transmitting the force to the needle bar in the sliding direction thereof.
A first guide means (30) arranged at a position sandwiching the needle bar crank rod from a direction orthogonal to a movement surface of the needle bar crank rod, and vertically guiding the other end of the needle bar crank rod; And two guide means (40).

According to the needle swinging device of the sewing machine of the first aspect, the first guide means and the second guide means for vertically guiding the other end of the needle bar crank rod are provided on the moving surface of the needle bar crank rod. It is arranged at a position sandwiched from the orthogonal direction.
In other words, since the movement of the other end of the needle bar crank rod is guided from both sides of the needle bar crank rod, the movement of the other end of the needle bar crank rod can be changed like the needle swinging device of the conventional sewing machine. As compared with the case where the needle bar is guided only on one of the two sides, the rotation and the inclination of the needle bar crank rod in the horizontal plane can be suppressed, and the generation of vibration and noise during the sewing operation can be suppressed. Further, since it is possible to suppress the rotation and the inclination of the needle bar crank rod in the horizontal plane, as a component for connecting one end of the needle bar crank rod to the drive source side, for example, a ball bearing or the like, which has a structurally small amount of play. Even when using the parts that are provided, it is possible to suppress the rattling of the needle swinging device of the sewing machine as a whole, improve the durability of the parts, and reduce the manufacturing cost of the needle swinging device of the sewing machine.

A needle swinging device for a sewing machine according to a second aspect is the needle swinging device for a sewing machine according to the first aspect, wherein the first guide means and the second guide means are the other ends of the needle bar crank rods, respectively. Sliding members (square pieces 32, 42) connected to
And a guide member (31, 41) for supporting the sliding member so as to be slidable in the vertical direction.

According to the needle swinging device of the second aspect, the same effect as that of the first aspect can be obtained, and the first guide means and the second guide means are respectively connected to the other end of the needle bar crank rod. And a guide member that supports the sliding member so as to be vertically slidable. Therefore, since the first guide means and the second guide means can be made to have a relatively simple structure without using, for example, an electrically driven device,
The manufacturing cost of the needle swinging device of the sewing machine can be suppressed.

A needle swinging device for a sewing machine according to a third aspect is the needle swinging device for a sewing machine according to the first or second aspect, wherein the needle bar is allowed to slide in the sliding direction, It is characterized in that it is provided with a third guide means (63) for inhibiting the needle bar from rotating around its axis.

According to the needle swinging device of the third aspect, the same effect as that of the first or second aspect can be obtained, and
The third guide means prohibits the needle bar from rotating around its axis while permitting the needle bar to slide, so that the thread inserted in the sewing needle is stably captured by the hook point, so that it is accurate. It is possible to form various seams.

A sewing machine needle swinging device according to a fourth aspect is the sewing machine needle swinging device according to any one of the first to third aspects, wherein the sewing needle attached to the tip of the needle bar is bottom dead. The needle bar crank rod provided with a sword tip (14) for catching the thread inserted in the sewing needle when the needle bar is being raised from a point, and the needle bar is guided by the first guide means and the second guide means. By arranging the needle bar so as to be displaced in the swinging direction of the needle bar with respect to the locus of the other end, the height of the sewing needle when the sword tip encounters the sewing needle is set to the swinging angle of the needle bar. It is characterized in that it is suppressed from changing according to.

According to the needle swinging device of the sewing machine of the fourth aspect, the same effect as that of any one of the first to third aspects can be obtained, and the height of the sewing needle when the sword tip meets the sewing needle. Is suppressed from changing according to the swing angle of the needle bar, so that the seam can be formed accurately.

A needle swinging device for a sewing machine according to claim 5 (1)
0) is a needle bar rocking base (60) that slidably supports the needle bar in the axial direction thereof, and the needle bar together with the needle bar rocking base is substantially orthogonal to the axial direction in the vertical plane. A swinging means (70) for swinging in a direction, and a needle bar having one end circularly moving in a vertical plane parallel to the vertical plane by a driving force supplied from a driving source and the other end interlocking with the needle bar. Crank rod (2
0) and permitting the needle bar to move in the swinging direction with respect to the other end of the needle bar crank rod, the needle bar crank rod from the drive source via the needle bar crank rod. A needle swinging device of a sewing machine, comprising: a driving force transmission means (50) for transmitting a driving force applied to the other end of the needle bar to the needle bar in its sliding direction. A first guide means (30) and a second guide means (40) are provided at positions sandwiching the rod crank rod from a direction orthogonal to the movement surface thereof and vertically guide the other end of the needle bar crank rod. It is characterized by that.

According to the needle swinging device of the fifth aspect of the present invention, the first guide means and the second guide means for vertically guiding the other end of the needle bar crank rod are orthogonal to the moving surface of the needle bar crank rod. It is arranged at a position sandwiched from the direction. In other words, since the movement of the other end of the needle bar crank rod is guided from both sides of the needle bar crank rod, the movement of the other end of the needle bar crank rod can be controlled by moving the other end of the needle bar crank rod as in the needle swinging device of the conventional sewing machine. Compared with the case of guiding only on one side, rotation and inclination of the needle bar crank rod in the horizontal plane can be suppressed, and vibration and noise during sewing operation can be suppressed. Further, since it is possible to suppress the rotation and the inclination of the needle bar crank rod in the horizontal plane, as a component for connecting one end of the needle bar crank rod to the drive source side, for example, a ball bearing or the like, which has a structurally small amount of play. Even when using the parts that are provided, it is possible to suppress the rattling of the needle swinging device of the sewing machine as a whole, improve the durability of the parts, and reduce the manufacturing cost of the needle swinging device of the sewing machine.

A needle swinging device for a sewing machine according to a sixth aspect is the needle swinging device for a sewing machine according to the fifth aspect, wherein the first guide means and the second guide means are provided at the other end of the needle bar crank rod. Sliding members (square pieces 32 and 42) to be connected, and a guide member (3 that supports the sliding members in a vertically slidable manner).
1, 41) are provided.

According to the needle swinging device of the sixth aspect of the present invention, the same effect as that of the fifth aspect can be obtained, and the first guide means and the second guide means are respectively connected to the other end of the needle bar crank rod. And a guide member that supports the sliding member so as to be vertically slidable. Therefore, since the first guide means and the second guide means can be made to have a relatively simple structure without using, for example, an electrically driven device,
The manufacturing cost of the needle swinging device of the sewing machine can be suppressed.

A needle swinging device for a sewing machine according to a seventh aspect is the needle swinging device for a sewing machine according to the fifth or sixth aspect, wherein the driving force transmitting means is a guide formed in a swinging direction of the needle bar. A guide means (51) that has a groove (51b) and slides integrally with the needle bar, and a connection that connects the other end of the needle bar crank rod to the guide means so as to be movable along the guide groove. Means (square piece 52).

According to the needle swinging device of the seventh aspect, the same effect as that of the fifth or sixth aspect can be obtained, and
By moving the other end of the needle bar crank rod in the vertical direction, the connecting means connected to the other end of the needle bar crank rod comes into contact with the upper surface or the lower surface of the guide groove, and is required to slide the needle bar. The force in the moving direction can be accurately transmitted to the needle bar to form an accurate stitch. In addition, since the connecting means only moves along the guide groove with the swing of the guide groove, no force is transmitted from the guide groove to the connecting means in the swing direction.
That is, the needle bar slides only by the force transmitted from the connecting means to the guide groove, and swings only by the force transmitted from the needle bar swing base. Therefore, the force transmitted from the needle bar crank rod to the needle bar and the force transmitted from the needle bar rocking base to the needle bar are strong and weak in relation to the phases of the needle bar crank rod and the needle bar rocking base. They do not conflict with each other, and accurate control of the needle swing amount becomes possible.

A needle swinging device of a sewing machine according to claim 8 is the needle swinging device of the sewing machine according to any one of claims 5 to 7, wherein the needle bar slides in the sliding direction. A third guide means (63) for prohibiting the needle bar from rotating around its axis while permitting is provided.

According to the needle swinging device of the eighth aspect, the same effect as that of any one of the fifth to seventh aspects can be obtained, and the third guide means permits the needle bar to slide. , Since the needle bar is prohibited from rotating around its axis, the thread inserted in the sewing needle is stably captured by the hook point,
Can form accurate seams.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A first embodiment of a needle swinging device for a sewing machine according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the needle swinging device 10 includes a needle bar crank rod 20 and a first guide means 3.
0, the second guide means 40, the driving force transmission means 50, the needle bar rocking base 60, the rocking means 70, etc.

The needle bar crank rod 20 is a substantially rod-shaped member for transmitting the driving force supplied from the upper shaft 11 of the sewing machine, which is the driving source, to the driving force transmitting means 50 described later.
The upper end 21 of the needle bar crank rod 20 is connected to the upper shaft 11 side via a connecting means such as a ball bearing. Then, as the upper shaft 11 rotates about its axis, a circular movement indicated by a circle C is performed in a plane (vertical plane) orthogonal to the axial direction of the upper shaft 11. Needle bar crank rod 20
The lower end 22 of the first guide means 30 and the second guide means 40, which will be described in detail later, are connected to each other.
The vertical movement is guided by the guide means 30 and the second guide means 40.

First guide means 30 and second guide means 40
Is disposed so as to face the needle bar crank rod 20 in a direction orthogonal to the movement surface of the needle bar crank rod 20, that is, in a position sandwiching the needle bar crank rod 20 from the front-back direction of the needle bar crank rod 20. It is a member that guides vertical movement.

The first guide means 30 is arranged on the rear side of the needle bar crank rod 20, and comprises a guide member 31 and a square piece 32 as a sliding member. The guide member 31 is a substantially rectangular member for guiding the vertical movement of a square piece 32, which will be described later, and has a groove portion 31a on its front side surface. The groove portion 31a is formed along the up-down direction so as to support the square piece 32 slidably in the up-down direction. The lateral width of the groove 31a is slightly larger than the lateral width of the square piece 32 so that the square piece 32 can slide in the groove 31a.

The square piece 32 has the guide member 31 as described above.
Sliding in the groove portion 31a of the needle bar crank rod 20
Is a substantially rectangular member that is arranged to move the lower end 22 of the. The square piece 32 is the needle bar crank rod 20.
Is rotatably supported at the lower end 22 of the needle bar crank rod 20 so as to be rotatable in a plane parallel to the moving surface. Further, as shown in FIG. 2A, the square piece 32 is formed with an extension portion 32a extending from the front edge portion.
The rear surface of the extension 32a is in contact with the front surface of the guide member 31.

The second guide means 40 is arranged on the front side of the needle bar crank rod 20 and comprises a guide member 41 and a square piece 42 as a sliding member. The guide member 41 is a substantially rectangular member for guiding the vertical movement of a square piece 42 described later, and has a slit 41a that is open from the front to the rear. The slit 41a is formed along the up-down direction to support the square piece 42 slidably in the up-down direction. As for the width of the slit 41a in the left-right direction,
The width of the square piece 42 is slightly larger than the width of the square piece 42 in the left-right direction so that the square piece 42 can slide in the inside.

The square piece 42, like the square piece 32 of the first guide means 30, has a lower end 22 of the needle bar crank rod 20.
Is a member having a substantially rectangular shape that is arranged to vertically move. The square piece 42 is the lower end 2 of the needle bar crank rod 20.
2, the needle bar crank rod 20 is pivotally supported so as to be rotatable in a plane parallel to the moving surface. Also,
As shown in FIG. 2A, the square piece 42 is formed with an extending portion 42a extending from the rear edge portion. The front portion of the extending portion 42a is in contact with the rear portion of the guide member 41.

Further, the guide member 31 of the first guide means 30 and the guide member 41 of the second guide means 40 each have a plurality of (three in the present embodiment) screw holes 31.
b and 41b are formed. Then, with the spacer 33 having the hollow hole 33a in the axial direction interposed between these two guide members 31, 41, insert the screw 34 into the screw holes 31b, 41b and the hollow hole 33a of the spacer 33. Then, these two guide members 31 and 41 are connected to each other with a certain interval. The guide member 31 is fixed to the sewing machine main body by a known fastening means such as a screw 35.

Then, as described above, when the needle bar crank rod 20 as a whole moves up and down with the circular movement of the needle bar crank rod upper end 21, the pair of front and rear corner pieces 32, 42 connected to the needle bar crank rod lower end 22 are connected. While rotating with respect to the needle bar crank rod 20, the needle bar crank rod lower end 22 moves vertically between the two guide members 31, 41 by sliding in the groove 31a and the slit 41a in the vertical direction. The structure is guided in the direction.

In the driving force transmitting means 50, the needle bar 12 swings with respect to the lower end 22 of the needle bar crank rod (the left-right direction).
Of the driving force supplied from the needle bar crank rod 20 while permitting the movement of the needle bar 12, that is, the force necessary for sliding the needle bar 12, that is, the needle bar 12 is oscillated by a needle bar swing described later. It is arranged to transmit to the needle bar 12 only the force required to move the table 60 up and down. The driving force transmitting means 50 is roughly constituted by a guide means 51, a square piece 52 as a connecting means, and the like.

The guide means 51 comprises a needle bar support portion 51a, a guide groove 51b, a sliding projection 51c and the like. The needle bar support 51a is a member for supporting the needle bar 12, and has an opening along the up-down direction. Then, by inserting the needle bar 12 into this opening, the needle bar 12 is moved to the needle bar supporting portion 51.
Support to move together with a. The guide groove 51b is
A square piece 52, which will be described later, slides inside the square piece 5
It is a member for guiding the movement of 2, and is formed in a substantially U shape in a side view. The guide groove 51b is formed by the needle bar support portion 51.
On the back side of a, it is arranged along the left-right direction and its opening is located on the rear side. Guide groove 5
The vertical height of 1b is slightly larger than the vertical height of the square piece 52 so that the square piece 52 can slide in the guide groove 51b.

The sliding protrusions 51c are provided on the needle bar support portion 51 for sliding the needle bar 12 in the axial direction (vertical direction).
The member is provided so as to project from the left side surface portion of a, and will be slidably engaged along the elongated hole 63a provided in the third guide means 63, which will be described in detail later. The square piece 52 is
It is a substantially rectangular member that slides in the guide groove 51b and movably connects the lower end 22 of the needle bar crank rod along the guide groove 51b. The square piece 52 is connected to the lower end 22 of the needle bar crank rod and is pivotally supported so as to be rotatable in a plane parallel to the swing direction of the needle bar 12.

The needle bar rocking base 60 is a substantially rod-shaped member which is arranged for rocking the needle bar 12 and supporting the needle bar 12 slidably in the axial direction thereof. Needle bar rocking table 60
Is swingably supported by an arm (not shown) of the sewing machine via a support portion 61 arranged at the upper end portion thereof. Further, at the lower end portion of the needle bar swing base 60, a rearwardly projecting substantially U-shaped connecting portion 62 is disposed.
Is connected to the square piece 73 of the swinging means 70 described later,
The needle bar rocking base 60 has a structure that rocks in the left-right direction about the support portion 61.

Further, the needle bar rocking base 60 is provided with a third guide means 63 for permitting the needle bar 12 to slide and forbidding (regulating) the rotation of the needle bar 12 around its axis. The third guide means 63 is a substantially rectangular plate body that is disposed on the right side surface of the needle bar rocking base 60 and rocks integrally with the needle bar rocking base 60.
The long hole 63a is provided along the vertical direction. Then, as described above, the sliding projection 51c of the driving force transmission means 50 is engaged with the elongated hole 63a.

The oscillating means 70 is arranged to oscillate the needle bar 12 together with the needle bar oscillating table 60 in a direction (horizontal direction) substantially perpendicular to the axial direction within the vertical plane. Drive axis 7
1, a swing lever 72, a square piece 73 and the like. Swing shaft 71
Is a member that is arranged parallel to the axial direction of the upper shaft 11 of the sewing machine and swings around the axis. The rocking lever 72 is a rod-shaped member that is arranged at the front end of the rocking shaft 71 so as to be substantially orthogonal to the axial direction of the rocking shaft 71. Projecting corner piece support 72a
Is equipped with. Then, the needle bar swing base 60 is supported by the square pieces 73 and the square piece support portions 72a so as to be rotatable in a plane parallel to the swing direction of the swing shaft 71.
Is connected to the connecting portion 62 of.

Then, as described above, the needle bar 12 rocks together with the needle bar rocking base 60. Further, as the lower end 22 of the needle bar crank rod 20 moves up and down, the square piece 52 connected to the lower end 22 of the needle bar crank rod contacts the upper surface or the lower surface of the guide groove 51b. Then, the vertical force required to slide the needle bar 12 is transmitted to the needle bar 12 via the guide groove 51b, and the needle bar 12 moves up and down.

According to the needle swinging device 10 of the sewing machine shown in the present embodiment, the square pieces 32, 42 are connected to both front and rear portions of the lower end 22 of the needle bar crank rod.
2 is the groove portion 31a of the first guide means 30 and the second guide means 4
It is slidably arranged in the zero slit 41a. Therefore, the rotation of the needle bar crank rod 20 and the square pieces 32 and 42 in the horizontal plane can be suppressed, and the generation of vibration and noise during the sewing operation can be suppressed.

Further, since the first guide means 30 and the second guide means 40 are arranged on both front and rear sides of the needle bar crank rod 20, the movement of the lower end 22 of the needle bar crank rod in the front and rear direction is restricted, and the needle bar Rod crank rod 20 and square piece 3
It is possible to suppress the inclination of 2, 42 and suppress the generation of vibration and noise during the sewing operation. In addition, the square pieces 32 and 42 of the first guide means 30 and the second guide means 40 are extended portions 32a and 42, respectively.
a, and the extending portions 32a and 42a have the guide member 3
Since it slides in the vertical direction while being in contact with the surfaces of Nos. 1 and 41, the inclination of the needle bar crank rod 20 and the square pieces 32 and 42 in the anteroposterior direction can be further suppressed.

Further, the needle bar crank rod 20 and the square piece 3
Since it is possible to suppress the inclination of 2, 42 in the front-rear direction, as a component for connecting the needle bar crank rod 20 to the upper shaft 11 side, for example, a component having a minute amount of looseness in structure such as a ball bearing is used. Even when the sewing machine needle swinging device 10 is loose, the rattling of the sewing machine needle swinging device 10 as a whole can be suppressed, the durability of parts can be improved, and the manufacturing cost of the sewing machine needle swinging device 10 can be suppressed. Furthermore, since the inclination of the needle bar crank rod 20 and the square pieces 32, 42 in the front-rear direction can be suppressed, the front-rear length of the groove portion 31a of the first guide means 30 and the slit 41a of the second guide means 40 can be reduced. Can be shortened. Therefore, the length of the guide members 31 and 41 in the front-rear direction can be shortened, and the sewing machine can be downsized.

When the lower end 22 of the needle bar crank rod 22 moves up and down, the square piece 52 connected to the lower end 22 of the needle bar crank rod abuts the upper surface or the lower surface of the guide groove 51b and slides the needle bar 12. The vertical force required to
It is transmitted to the needle bar 12 via the needle bar support 51a. At this time, the sliding projection 51c of the driving force transmitting means 50 slides along the elongated hole 63a of the third guiding means 63, so that the driving force transmitting means 50 and thus the needle bar 12 are accurately guided in the vertical direction. , Can form accurate seams.

Further, the swing of the needle bar swing base 60 is transmitted to the driving force transmitting means 50 through the sliding projection 51c, and the square piece 5 is moved along with the swing of the guide groove 51b of the driving force transmitting means 50.
2 slides in the left-right direction relative to the guide groove 51b. Here, since the square piece 52 only slides inside the guide groove 51b in the left-right direction, the force acting in the left-right direction from the guide groove 51b to the square piece 52 is not transmitted. Further, due to the circular motion of the upper end 21 of the needle bar crank rod, a lateral force acts on the lower end 22 of the needle bar crank rod. This lateral force is applied to the square piece 32 connected to the lower end 22 of the needle bar crank rod. , 42 to the guide members 31, 41 of the first guide means 30 and the second guide means 40, so that they are not transmitted to the square piece 52 and have no influence on the movement of the needle bar 12.

That is, the needle bar 12 moves up and down only by the vertical force transmitted from the square piece 52 to the guide groove 51b (needle bar support portion 51a) and rocks together with the needle bar rocking base 60. Become. Therefore, the needle bar crank rod 20 (square piece 5
The force transmitted from 2) to the needle bar 12 and the force transmitted from the needle bar swing base 60 to the needle bar 12 are the same as the needle bar crank rod 2
With respect to the phase of 0 and the needle bar swinging base 60, there is no mutual strength, and accurate control of the needle swing amount becomes possible.

Further, for example, when a force is applied to the square piece 52 in the front-rear direction, the square piece 52 contacts the front surface of the guide groove 51b to rotate the needle bar support portion 51a in the horizontal plane. There is a possibility that the force acts and the needle bar 12 supported by the needle bar support portion 51a rotates around the axis. However, even in such a case, as described above, the sliding projection 51c of the driving force transmission means 50 has the elongated hole 6 of the third guide means 63.
Since it engages with 3a, one of the front and rear side surfaces of the sliding projection 51c abuts on the side surface of the elongated hole 63a, thereby restricting the rotation of the needle bar support portion 51a in the horizontal plane.
Therefore, it is possible to prohibit the needle bar 12 from rotating around the axis,
Since the thread inserted into the sewing needle is stably captured by the hook tip, an accurate seam can be formed.

The square piece 52 is slidably supported in the left-right direction by the guide groove 51b, but is within a minute range in the front-rear direction, that is, within the range in which the square piece 52 does not slip out of the guide groove 51b. It has a slidable structure. Therefore, when a force in the front-rear direction acts on the square piece 52, the square piece 52 does not contact the front surface portion of the guide groove 51b,
By moving a minute amount in the front-rear direction, the force that attempts to rotate the needle bar 12 about its axis is absorbed, so that the rotation of the needle bar 12 about its axis can be prohibited, and accurate stitches can be formed.

The present invention is not limited to the above embodiment, but can be implemented in various forms within the technical scope of the present invention. For example, in the above-described embodiment, the driving force transmission means 50 includes the square piece 52,
For example, a spherical member projecting forward from the square piece 42 may be provided, and this spherical member may be used as a so-called roller to slide in the guide groove 51b. In addition, the first guide means 30 and the second guide means 40 include the guide members 31 and 41 having the groove portion 31a and the slit 41a, and the square piece 3.
However, the present invention is not limited to this, and, for example, a bar-shaped member extending in the vertical direction is provided, and instead of the square pieces 32 and 42, the bar-shaped member is inserted into the bar-shaped member. A member that moves up and down along the direction may be used.

Further, although the square pieces 32 and 42 of the first guide means 30 and the second guide means 40 are provided with the extending portions 32a and 42a, the present invention is not limited to this, and the extending portions 32a and 32a, for example.
42a may be omitted, and FIG.
As shown in FIG. 3, the back surface of the square piece 32 of the first guiding means 30 is brought into contact with the front surface of the groove 31a, and the second guiding means 40
It is also possible to provide a structure in which projecting portions 41c projecting inward from both left and right side surface portions of the slit 41a are provided and the front surface portion of the square piece 42 is brought into contact with the back surface portion of the projecting portion 41c. Further, the extending portion may be provided only on one of the square pieces 32 and 42 of the first guiding means 30 and the second guiding means 40, or only on one of the square pieces. It may be brought into contact with the front surface of the groove 31a or the back surface of the protruding portion 41c of the slit.

Arrangement of various devices (needle bar swinging base 60, first to third guiding means 30, 40, 63, driving force transmitting means 50, etc.) which constitute the needle swinging device 10 of the sewing machine according to the present invention. The position is not limited to the above-described embodiment, and for example, the first guide unit 30 and the second guide unit 4 can be used.
0, the needle bar crank rod 20 and the like may be arranged on the front side of the needle bar 12.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings. In the needle swinging device 80 of the sewing machine according to the present embodiment,
Portions having the same configurations as those of the first embodiment are designated by the same reference numerals in the drawings, and their description will be omitted.

As shown in FIGS. 4 and 5, the construction of the needle swinging device 80 of the sewing machine differs from the needle swinging device 10 of the sewing machine shown in the first embodiment in that the driving force transmitting means 90 is used. Is a point that is roughly configured by the needle bar holder 91 and the rod 92. The driving force transmission means 90 suppresses transmission of the driving force applied to the needle bar 12 from the driving source (upper shaft 11) via the needle bar crank rod 20 in the swinging direction of the needle bar 12, That is, the driving force is transmitted in the sliding direction of the needle bar 12 while transmitting a part of the driving force in the swinging direction of the needle bar 12.

Needle swinging device 8 of the sewing machine according to the present embodiment
At 0, the needle bar rocking base 60 supports the needle bar 12 slidably in its axial direction, and the needle bar holder 91 is fixed at a predetermined position of the needle bar 12. Further, the rod 92 has the square piece 42 of the second guide means 40 at one end and the needle bar holder 9 at the other end.
1 and the needle bar 12 are connected so as to be rotatable in a plane parallel to the swinging direction of the needle bar 12. As in the first embodiment, the lower end 22 of the needle bar crank rod is vertically guided by the first guide means 30 and the second guide means 40. Further, the groove portion 31a of the first guide means 30 and the slit 41a of the second guide means 40.
Is the needle bar 12 in a non-oscillating state, that is, the needle bar 12 in a state in which the axial direction is orthogonal to the horizontal plane.
On the other hand, they are arranged so as to be on the same line when viewed from the front.

The driving force applied to the needle bar crank rod 20 from the upper shaft 11 is transmitted to the rod 92, and the needle bar 12
The vertical force required to move the needle up and down
1 is transmitted to the needle bar 12 and the needle bar 12 moves up and down. Further, the needle bar 12 is rocked by the rocking of the needle bar rocking base 60.

The sewing machine needle swinging device 80 shown in the present embodiment can also achieve the same effects as the sewing machine needle swinging device 10 shown in the first embodiment.
Further, as the needle bar holder 91 swings, the rod 92 rotates in the left-right direction around the portion connected to the square piece 42.
That is, most of the lateral force acting on the rod 92 from the needle bar holder 91 due to the swing of the needle bar holder 91 is absorbed (suppressed) by the lateral rotation of the rod 92, and the force is absorbed by the rod 92. Not transmitted. Further, due to the circular motion of the upper end 21 of the needle bar crank rod, a lateral force acts on the lower end 22 of the needle bar crank rod. This lateral force is applied to the square piece 32 connected to the lower end 22 of the needle bar crank rod. ,
Since it is transmitted to the guide members 31 and 41 of the first guide means 30 and the second guide means 40 via 42, it is not transmitted to the rod 92 and does not affect the movement of the needle bar 12.

That is, the needle bar 12 moves up and down only by the vertical force transmitted from the rod 92 to the needle bar holder 91, and the horizontal force mainly transmitted from the needle bar rocking base 60 to the needle bar 12. Will cause it to swing. Therefore, the force transmitted from the needle bar crank rod 20 to the needle bar 12 and the force transmitted from the needle bar rocker base 60 to the needle bar 12 are in phase with each other between the needle bar crank rod 20 and the needle bar rocker base 60. In relation to, it is possible to control the amount of needle swing accurately, and to form accurate stitches. If the third guide means 63 shown in the first embodiment is arranged on the needle bar rocking base 60 and the sliding projection 51c is arranged on the needle bar holder 91, the first guide means 63 is formed. Needle swinging device 10 shown in the embodiment
Similarly, the rotation of the needle bar 12 around the axis can be prohibited.

[Third Embodiment] Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, in the needle swinging device 100 of the sewing machine according to the present embodiment, parts having the same configurations as those of the above-described second embodiment are denoted by the same reference numerals in the drawings, and description thereof will be given. Omit it.

In the construction of the needle swinging device 100 of this sewing machine, the needle swinging device 8 of the sewing machine shown in the second embodiment is shown.
The difference from 0 is that the first guide means 30 and the second guide means 40 are either left or right with respect to the arrangement positions of the first guide means 30 and the second guide means 40 shown in the second embodiment. It is a point that is arranged by being displaced in that direction. In the present embodiment, since the needle bar crank rod upper end 21 rotates clockwise on the circle C in a front view, the first guide means 30 and the second guide means 40 are arranged so as to be displaced leftward. . Also,
The drawings showing the structure of the needle swinging device 100 of the sewing machine according to the present embodiment are omitted.

FIG. 6 shows a state in which, when the sewing needle attached to the tip of the needle bar is rising from the bottom dead center in the rotary hook 13 of the sewing machine, the sword tip 14 captures the thread inserted in the sewing needle. The position of the needle bar crank rod lower end 22 is shown. Here, as the needle bar 12 swings, the position of the bottom dead center of the sewing needle (the height in the vertical direction) changes within a certain range, and the timing at which the sword tip 14 meets the sewing needle in accordance with the change in the position of the sewing needle. Changes. In the needle swinging device 100 shown in the present embodiment, the needle bar crank rod lower end 22 has the first guide means 30 and the second guide means 30.
Since it is guided by the guide means 40, it is not affected by the swing of the needle bar 12 and always moves along the groove portion 31a and the slit 41a. Therefore, as shown by points P1, P2, and P3 in the drawing, the timing of the encounter is met. The position of the lower end 22 of the needle bar crank rod does not change much even when the swing angle of the needle bar 12 changes, as compared with the case of the above-described needle swinging device of the conventional sewing machine (see FIG. 9).

According to the needle swinging device 100 of the sewing machine shown in the present embodiment, the same effect as that of the needle swinging device 80 of the sewing machine shown in the second embodiment can be obtained, and the sword tip 14 is provided. A change in the height of the sewing needle when it encounters the sewing needle can be suppressed, and the seam can be formed accurately. Note that the effect of suppressing the change in the height of the sewing needle when the sword tip 14 encounters the sewing needle as shown in the present embodiment is that the groove portion 31a and the slit 41a as shown in the second embodiment.
Can be obtained even when is not displaced, but the first
A greater effect can be obtained by displacing the groove portions 31a and the slits 41a of the guide means 30 and the second guide means 40 in either the left or right direction in accordance with the rotation direction of the needle bar crank rod upper end 21. .

[0062]

According to the needle swinging device of the sewing machine of the first aspect, the first guide means and the second guide means for vertically guiding the other end of the needle bar crank rod move the needle bar crank rod. It is arranged at a position sandwiched from the direction orthogonal to the plane. In other words, since the movement of the other end of the needle bar crank rod is guided from both sides of the needle bar crank rod, the movement of the other end of the needle bar crank rod can be changed like the needle swinging device of the conventional sewing machine. As compared with the case where the needle bar is guided only on one of the two sides, the rotation and the inclination of the needle bar crank rod in the horizontal plane can be suppressed, and the generation of vibration and noise during the sewing operation can be suppressed. Further, since it is possible to suppress the rotation and the inclination of the needle bar crank rod in the horizontal plane, as a component for connecting one end of the needle bar crank rod to the drive source side, for example, a ball bearing or the like, which has a structurally small amount of play. Even when using the parts that are provided, it is possible to suppress the rattling of the needle swinging device of the sewing machine as a whole, improve the durability of the parts, and reduce the manufacturing cost of the needle swinging device of the sewing machine.

According to the needle swinging device of the second aspect, the same effect as that of the first aspect can be obtained, and the first guide means and the second guide means are respectively connected to the other end of the needle bar crank rod. And a guide member that supports the sliding member so as to be vertically slidable. Therefore, since the first guide means and the second guide means can be made to have a relatively simple structure without using, for example, an electrically driven device,
The manufacturing cost of the needle swinging device of the sewing machine can be suppressed.

According to the needle swinging device of the sewing machine of the third aspect, the same effect as that of the first or second aspect can be obtained, and
The third guide means prohibits the needle bar from rotating around its axis while permitting the needle bar to slide, so that the thread inserted in the sewing needle is stably captured by the hook point, so that it is accurate. It is possible to form various seams.

According to the needle swinging device of the fourth aspect, the same effect as that of any one of the first to third aspects can be obtained, and the height of the sewing needle when the sword tip encounters the sewing needle. Is suppressed from changing according to the swing angle of the needle bar, so that the seam can be formed accurately.

According to the needle swinging device of the sewing machine of the fifth aspect, the first guide means and the second guide means for vertically guiding the other end of the needle bar crank rod are orthogonal to the movement plane of the needle bar crank rod. It is arranged at a position sandwiched from the direction. In other words, since the movement of the other end of the needle bar crank rod is guided from both sides of the needle bar crank rod, the movement of the other end of the needle bar crank rod can be controlled by moving the other end of the needle bar crank rod as in the needle swinging device of the conventional sewing machine. Compared with the case of guiding only on one side, rotation and inclination of the needle bar crank rod in the horizontal plane can be suppressed, and vibration and noise during sewing operation can be suppressed. Further, since it is possible to suppress the rotation and the inclination of the needle bar crank rod in the horizontal plane, as a component for connecting one end of the needle bar crank rod to the drive source side, for example, a ball bearing or the like, which has a structurally small amount of play. Even when using the parts that are provided, it is possible to suppress the rattling of the needle swinging device of the sewing machine as a whole, improve the durability of the parts, and reduce the manufacturing cost of the needle swinging device of the sewing machine.

According to the needle swinging device of the sixth aspect, the same effect as that of the fifth aspect can be obtained, and the first guide means and the second guide means are respectively connected to the other end of the needle bar crank rod. And a guide member that supports the sliding member so as to be vertically slidable. Therefore, since the first guide means and the second guide means can be made to have a relatively simple structure without using, for example, an electrically driven device,
The manufacturing cost of the needle swinging device of the sewing machine can be suppressed.

According to the needle swinging device of the seventh aspect, the same effect as that of the fifth or sixth aspect can be obtained, and
By moving the other end of the needle bar crank rod in the vertical direction, the connecting means connected to the other end of the needle bar crank rod comes into contact with the upper surface or the lower surface of the guide groove, and is required to slide the needle bar. The force in the moving direction can be accurately transmitted to the needle bar to form an accurate stitch. In addition, since the connecting means only moves along the guide groove with the swing of the guide groove, no force is transmitted from the guide groove to the connecting means in the swing direction.
That is, the needle bar slides only by the force transmitted from the connecting means to the guide groove, and swings only by the force transmitted from the needle bar swing base. Therefore, the force transmitted from the needle bar crank rod to the needle bar and the force transmitted from the needle bar rocking base to the needle bar are strong and weak in relation to the phases of the needle bar crank rod and the needle bar rocking base. They do not conflict with each other, and accurate control of the needle swing amount becomes possible.

According to the needle swinging device of the eighth aspect, the same effect as that of any one of the fifth to seventh aspects can be obtained, and the third guide means allows the needle bar to slide. , Since the needle bar is prohibited from rotating around its axis, the thread inserted in the sewing needle is stably captured by the hook point,
Can form accurate seams.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a needle swinging device of a sewing machine according to a first embodiment.

FIG. 2 is a plan view (A) and (B) of essential parts showing the structures of a first guide means and a second guide means.

FIG. 3 is a side view of an essential part showing the structure of first guide means and second guide means.

FIG. 4 is a perspective view showing an overall configuration of a needle swinging device of a sewing machine according to a second embodiment.

FIG. 5 is a side view showing an overall configuration of a needle swinging device for a sewing machine according to a second embodiment.

FIG. 6 is an explanatory diagram showing an effect of the needle swinging device of the sewing machine according to the third embodiment.

FIG. 7 is a perspective view showing an entire configuration of a needle swinging device of a conventional sewing machine.

FIG. 8 is a plan view (A) of a main part and a side view (B) of the main part showing a structure of a conventional needle swinging device.

FIG. 9 is an explanatory view showing a problem of the conventional needle swinging device of the sewing machine.

[Explanation of symbols]

10 Sewing machine needle swing device 12 needle bar 14 Sword tip 20 needle bar crank rod 30 First guidance means 31 Guide member 32 Sliding member (square piece) 40 Second guidance means 41 Guide member 42 Sliding member (square piece) 50 Driving force transmission means 51 Guide means 52 Connection means (square piece) 60 needle bar rocker 63 Third guide means 70 rocking means 80 Sewing machine needle swing device 90 Driving force transmission means

Claims (8)

[Claims] 1. A needle bar rocking base for slidably supporting the needle bar in its axial direction, and the needle bar together with the needle bar rocking base in a direction substantially orthogonal to the axial direction in a vertical plane. Swinging means for swinging, a needle bar crank rod having one end circularly moving in a vertical plane parallel to the vertical plane by a driving force supplied from a driving source, and the other end interlocking with the needle bar, The driving force applied to the other end of the needle bar crank rod from the driving source via the needle bar crank rod is prevented from being transmitted to the needle bar in its swinging direction, and the driving force is applied to the needle bar. A needle swinging device for a sewing machine, comprising: a driving force transmitting means for transmitting a force in a sliding direction to a rod, wherein the needle bar crank rod is disposed at a position sandwiched from a direction orthogonal to a movement surface of the needle bar crank rod. Is installed to guide the other end of the needle bar crank rod in the vertical direction. Needle swing device of a sewing machine, characterized in that a first guide means and second guide means. 2. The needle swinging device for a sewing machine according to claim 1, wherein the first guiding means and the second guiding means are respectively
A sliding member connected to the other end of the needle bar crank rod,
A needle swinging device for a sewing machine, comprising: a guide member that slidably supports the sliding member in a vertical direction. 3. The needle swinging device for a sewing machine according to claim 1, wherein the needle bar rotates about its axis while allowing the needle bar to slide in the sliding direction. A needle swinging device for a sewing machine, comprising a third guide means for prohibiting the above. 4. The sewing machine needle swing device according to claim 1, wherein the sewing needle attached to the tip of the needle bar is rising from bottom dead center. The needle bar is provided with a sword tip for catching the thread inserted in the needle, and the needle bar is moved relative to the locus of the other end of the needle bar crank rod guided by the first guide means and the second guide means. By arranging the needles so that they are displaced in the swinging direction, the height of the sewing needle when the sword tip meets the sewing needle is suppressed from changing in accordance with the swinging angle of the needle bar. Sewing machine needle swing device. 5. A needle bar rocking base for slidably supporting the needle bar in the axial direction, and the needle bar together with the needle bar rocking base in a direction substantially orthogonal to the axial direction in a vertical plane. Swinging means for swinging, a needle bar crank rod having one end circularly moving in a vertical plane parallel to the vertical plane by a driving force supplied from a driving source, and the other end interlocking with the needle bar, While allowing the needle bar to move in the swinging direction with respect to the other end of the needle bar crank rod, the needle bar is added to the other end of the needle bar crank rod via the needle bar crank rod. A needle swinging device for a sewing machine, the driving force transmitting means transmitting the driving force to the needle bar in a sliding direction thereof, wherein the needle bar crank rod is orthogonal to a moving surface of the needle bar crank rod. The needle bar crank rod is disposed at a position sandwiched from the direction Needle swing device of a sewing machine, characterized in that a first guide means and second guide means for guiding the other end in the vertical direction. 6. The needle swinging device for a sewing machine according to claim 5, wherein the first guiding means and the second guiding means are respectively
A sliding member connected to the other end of the needle bar crank rod,
A needle swinging device for a sewing machine, comprising: a guide member that slidably supports the sliding member in a vertical direction. 7. The needle swinging device for a sewing machine according to claim 5, wherein the driving force transmitting means has a guide groove formed in a swinging direction of the needle bar, and is integral with the needle bar. 2. A needle swinging device for a sewing machine, comprising: a guide means that slides on the needle bar; and a connecting means that connects the other end of the needle bar crank rod to the guide means so as to be movable along the guide groove. 8. A needle swinging device for a sewing machine according to claim 5, wherein the needle bar is allowed to slide in the sliding direction while the needle bar has an axis. A needle swinging device for a sewing machine, comprising a third guide means for prohibiting rotation around.