JP2003284876A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine wherein thread-winding to a thread take-up lever on which a slit is formed is facilitated. <P>SOLUTION: Under a thread way 76 which extends in the horizontal direction, a bobbin winder tension member 58 is arranged. The upper section becomes highest in the vicinity of the center in the longitudinal direction, and a rear upper guiding end part 64 behind the highest part gradually linearly tilts from the far end side of the thread take-up lever 22 to the rear side as the bobbin winder tension member 58 extends downward. Under the linearly tilted section of the rear upper guiding end part 64, a rear lower guiding end part 66 of which the rear end forms a curve is formed. In this case, the rear upper guiding end part 64 and the rear lower guiding end part 66 are formed in such a manner that a connecting section of the rear upper guiding end part 64 and the rear lower guiding end part 66 may protrude backward most and exceed the opening of the slit on the thread take-up lever 22 at a highest location shown by a chain double-dashed line. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having a balance having a slit having one side closed and the other side opened.

[0002]

2. Description of the Related Art Conventionally, a sewing machine is provided with a balance that moves up and down in a predetermined phase with respect to a needle, and the thread is pulled up by the balance. As such a balance, there is one in which a through hole is formed in the tip portion thereof, and an operator inserts a thread into the through hole. However, since it is troublesome for the operator to insert the thread into the through hole, there are some in which the tip portion of the balance is formed to be recessed downward instead of the through hole. In the balance with the tip of the balance dented downward, the upper part of the dent is open, so the worker can hang the thread from above the balance, so the thread hooking work is easy, but the thread is It may come off.

In some of the balances, a through hole is formed at the tip of the balance, a slit extending rearward from the through hole is formed along the balance, and an opening is formed at the end of the slit. For example, Japanese Patent Publication No. 5-6683 of the applicant
There is a balance described in Japanese Patent No.

A general procedure for hooking a thread on a balance having such a slit is as follows. The worker moves the yarn along the yarn path, and the yarn is stretched vertically. Then, the worker moves the thread backward, and the thread separates from the tip portion along the side surface of the balance extending in the front-rear direction.
When the worker judges that the thread has reached the opening of the slit based on the skill, the operator moves the thread to the left,
The thread crosses above the balance. Next, the worker moves the yarn toward the tip in the opposite direction along the yarn path, the yarn enters the slit through the opening, and further, the worker moves the yarn toward the tip direction, The thread reaches the through hole near the tip of the balance. That is, the yarn is reciprocated in the extension direction of the slit. Subsequently, the worker moves the yarn along the yarn path to the needle below the balance.

[0005]

However, it is troublesome for the operator to accurately operate the thread so that the thread reaches the opening of the slit, or after checking the thread, to move the thread toward the tip end side. However, if you move the thread in the opposite direction without performing an accurate operation or confirmation, the operator will move the thread toward the tip of the balance, even though the thread has not reached the opening. There is a problem that the thread does not enter the slit and the thread does not hang properly on the balance. Furthermore, sewing is started with the thread not being properly hung on the balance,
There was a risk that thread entanglement would occur inside the sewing machine.

In the structure in which the tip portion of the balance moves in and out of the sewing machine main body, when the opening portion of the slit is located inside the sewing machine, it is difficult to visually recognize whether or not the thread reaches the opening portion of the slit. It was difficult to hang the thread correctly on the balance. Therefore, there are the same problems and fears as described above.

Further, since the balance moves up and down during sewing,
In order to avoid contact between the balance and other objects, it is desirable that the balance moves up and down only inside the sewing machine. However, if the balance is configured to move up and down only inside the sewing machine, the opening portion of the slit is always located inside the sewing machine, and it is difficult to visually recognize that portion, so the above-mentioned problems are likely to occur.

Further, it is conceivable that the worker does not move the yarn along the yarn path above the balance but stretches the yarn with some member and hangs the stretched yarn on the balance. In a threaded balance having a slit, the thread does not enter the slit of the thread balance unless the thread holder reciprocates in the direction of extension of the thread, and there are similar problems and fears.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a sewing machine which facilitates threading on a threaded balance having slits.

[0010]

In order to achieve this object, a sewing machine according to a first aspect of the present invention has a balance which vertically reciprocates between an uppermost position and a lowermost position, and a predetermined position including the uppermost position of the balance. And a thread guide body having a thread guide end portion that is arranged on the side of the balance over a range and that extends downward and from the tip direction of the balance toward the anti-tip direction, and the balance has a tip end of the balance. The slit on the direction side is closed, and an opening portion open to the outside is provided on the side opposite to the tip end side.

The balance is located below the uppermost position of the vertical reciprocating motion. The slit of the balance is closed on the tip end side of the balance, and the slit of the balance is open at an opening apart from the tip of the balance. The yarn guide end of the yarn guide is located further in the direction opposite to the tip end than the opening of the slit, and the lowermost end of the yarn guide is open to the outside below the uppermost position of the balance.

A sewing machine according to a second aspect of the present invention includes a thread guide body having a thread guide end portion that is provided so as to be inclined below a thread path that extends in a horizontal direction, and below the thread path, the thread guide body is provided. The end portion is located on the side opposite to the tip end side with respect to the opening.

A sewing machine according to a third aspect of the present invention is an insertion portion into which a plurality of thread holding portions that are located apart from each other in a direction intersecting the extending direction of the balance are inserted, and the plurality of thread holding portions that are inserted therein are provided. A thread guide body having a thread guide end portion provided between the thread holders, and the thread guide end portion is opposite to the tip end side from the opening portion between the plurality of thread holding portions inserted into the insertion portion. Is located in.

In the sewing machine according to a fourth aspect of the present invention, the portion below the inclined portion is positioned on the side opposite to the tip end of the opening along the locus of the opening of the balance descending from the uppermost position. A thread guide body having a thread guide end portion formed in, and even if the balance is lowered from the uppermost position, a portion of the thread guide end portion below the inclined portion is located above the opening portion. Is also located on the opposite end side.

According to a fifth aspect of the present invention, the sewing machine is provided so as to be located on the side opposite to the tip end side of the opening when the needle, which moves up and down in a predetermined phase with respect to the balance, is in a position where threading is possible. And a thread guide body having a thread guide end, and when the thread can be threaded through the needle, the thread guide end is located on the side opposite to the tip end side with respect to the opening.

A sewing machine according to a sixth aspect of the present invention includes a thread guide body having thread guide ends provided on both sides of the balance, and the thread guide ends are provided on both sides of the balance more than the opening. It is located on the opposite end side.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. It should be noted that with the operator side in FIG. 1 as the front, the left and right are determined based on the operator facing the sewing machine 10 and will be described below.

As shown in FIG. 1, the sewing machine 10 includes a bed portion 12 having a horizontal surface, a pedestal portion 14 standing upright from the right end of the bed portion 12, and an arm portion extending leftward from the pedestal portion 14. 16 and the head portion 1 which is the left end portion of the arm portion 16.
8 and. A needle bar 20 is provided on the head portion 18 so as to be vertically reciprocable, and a balance 22 is provided so as to be vertically reciprocable at a predetermined phase with respect to the needle bar 20. Further, in the head portion 18, a threading portion 26 through which the thread T is passed through the needle 24 at the lower end of the needle bar 20, and the threading portion 26.
A threading lever 28 for operating is disposed so as to be operable. The needle 24 cooperates with the shuttle 30 in the bed portion 12, and as shown in FIG. 2, the needle 24 and the balance 22 reciprocate up and down in a predetermined phase to form a stitch.

As shown in FIGS. 3 to 5, the balance 22 extends in the front-rear direction when viewed from above, and when viewed from the left, is formed in a substantially arcuate shape with its center raised upward. The front portion 32 of the balance 22 is a free end (tip portion), and the front portion 32 is located in front of the needle bar 20 and above the needle 24. The rear portion 34 of the balance 22 is provided with a plurality of members,
It is connected to a crank 38 fixed to the main shaft 36.
A pin 42 is fixed to an intermediate portion 40 of the balance 22 in the front-rear direction so as to extend rightward, and the pin 42 is swingably inserted into a through hole in the front portion of a rod 44. A supporting shaft 46 is swingably inserted into the through hole in the rear portion of the rod 44 so as to extend in the left-right direction.
Reference numeral 6 is swingably supported by a support member 48 fixed to the head portion 18. That is, the balance 22 supports the support shaft 46.
The sewing machine 10 is configured so that the balance 22 reciprocates up and down when the main shaft 36 rotates in the direction of the arrow.

A circular penetrating portion 50 penetrating in the left-right direction is formed in the front portion 32 of the balance 22, and a slit 52 extending rearward from the circular penetrating portion 50 is provided in the balance 2.
It is formed along the line 2. The width of the slit 52 in the vertical direction is wider than the thickness of the general thread T, but is narrower than the width of the circular penetrating portion 50 in the vertical direction, and the length in the front-rear direction thereof is larger than that of the circular penetrating portion 50. It is formed long. Further, the front portion 32a above the balance 22 located above the slit 52 is a front portion below the balance 22 located below the slit 52 at the rear (opposite tip side direction) end portion of the slit 52. It descends until it faces the right side surface of 32b. The left side surface of the lower part of the upper front part 32a and the right side surface of the lower front part 32b approach each other with a slight width in the left-right direction wider than the thickness of the general thread T, The slit 52 of the balance 22 is opened to the outside there, and the portion having the gap is the opening 54 of the slit 52 of the balance 22. That is, the balance 22 is provided with a slit 52 at the front end portion of the balance 22 in which the front end side of the balance 22 is closed and the counter end side is open to the outside with an opening 54.

Thus, the opening 54 of the slit 52 is
Is formed rearward apart from the front end portion of the balance 22, so that the circular penetrating portion 50 reciprocates up and down so as to draw an "8" as shown by the chain double-dashed line in FIG. Also,
The balance 22 is configured so that the thread T hung on the circular penetrating portion 50 does not come out accidentally.

In front of the balance 22, as shown in FIG. 6, a thread guide member 58 is provided so as to extend in the vertical direction. Also, when viewed from above, as shown in FIG.
The thread guide member 58 extends from the front to the rear, and the balance 2
It extends in the front-back direction in parallel with the balance 22 on both sides of 2. The yarn guiding member 58 has two vertically extending plate-shaped projecting portions 60 that are orthogonal to each other in the left-right direction. The right end of the overhanging portion 60 is fixed to the head portion 18. Two overhangs 6 as seen from above
0, the balance 22 projects from the rear in a space surrounded by the intermediate portion 62, and vertically reciprocates in the space.

As shown in FIG. 7, the upper portions of the overhanging portions 60 on both the left and right sides are the highest in the vicinity of the center in the front-rear direction, and the rear upper guide end portion 64 rearward of the highest portion.
Is gradually and linearly inclined rearward from the front end direction of the balance 22 as it extends downward. Then, below the linearly inclined portion of the rear upper guide end 64,
As shown in FIG. 7, the rear lower guide end portion 6 is curved.
6 is formed. At the linearly inclined portion, the rear upper guide end portion 64 and the rear lower guide end portion 66 are connected, and that portion projects to the rearmost. The portion protruding most rearward is provided close to the opening 54 of the slit 52 of the balance 22 at the uppermost position shown by the chain double-dashed line in FIG.
The rear upper guide end 64 and the rear lower guide end 66 are provided so as to cross the opening 54 of the slit 52 of the balance 22 rearward.
Has been formed.

The rear lower guide end 66 is the balance 2 shown in FIG.
Located in a part of the uppermost and lowermost position of 2,
It is provided over a predetermined range including the uppermost position of the balance 22 shown by the two-dot chain line in FIG. 7. The lowermost end portions 66a of the rear lower guide end portions 66 on both the left and right sides are the intermediate portion 62 and the head portion 1.
It is separated from the inner wall of 8, is formed like a fang protruding downward, and is open to the outside. Further, when viewed from the left side, as shown in FIG. 5, the rear lower guide end portion 66 is
The circular penetrating portion 50 at the tip portion of the balance 22 is located behind the range where the circular penetrating portion 50 reciprocates vertically. This rear lower guide end 66
8, the curve follows the locus of the opening 54 of the slit 52 of the balance 22 descending from its uppermost position, and the rear lower guide end 66 descends within the range shown in FIG. It is formed so as to extend beyond the opening 54 of the balance 22 to the rear side.

A resin cover 70 is fixed to the front side surface of the intermediate portion 62, and the resin cover 70 becomes a part of the exterior of the head portion 18 of the sewing machine 10. The resin cover 70 is arranged with a wider space than the outer thickness of the other head than the thickness of the general thread T, and the space is the space.
2,74,76. Specifically, as shown in FIG. 9, the gaps on both the left and right sides of the resin cover 70 become the two yarn paths 72 and 74 extending in the vertical direction, and the yarn T is formed on the left and right sides of the thread take-up 22 and the yarn guide member 58. To extend the vertical direction. The yarn path 72 is located on the right side of the thread take-up 22 and the thread guide member 58 when viewed from the front, and the thread take-up 2
2 and above the thread guide member 58. Further, the yarn path 74, when viewed from the front, is based on the balance 22 and the yarn guide member 5.
It is located on the left side of 8 and extends from above the balance 22 and the thread guide member 58 to near the upper portions of the needle 24 and the threading portion 26 below them. And when viewed from the front, the yarn path 7
4, the right side overhanging portion 60, the balance 22, the left side overhanging portion 60, and the yarn path 76 are located in this order from the right.

The gap on the upper side of the resin cover 70 serves as a yarn path 76 extending in the horizontal direction so that the yarn T crosses over the balance 22 and the yarn guide member 58. The yarn path 76 extending in the horizontal direction is located behind and above the highest portion of the overhanging portion 60, above the inclined rear upper guide end 64, and further over the most overhanging portion of the overhanging portion 60. Located in front of and above.

These yarn paths 72, 74 and 76 are shown in FIG.
~ As shown in FIG. 13, so that the thread T extends diagonally,
The internal space of the sewing machine 10 below it is connected. Therefore, the thread T that comes into contact with the balance 22 will not move to the rear lower guide member
It is also possible to pass below 6 and run over yarn paths 72, 74. The thread path 76 extending in the horizontal direction is located above the uppermost balance 22, and the balance 22 reciprocates up and down inside the sewing machine 10 to prevent the balance 22 from colliding with other members. . That is, the opening 5 of the slit 52
4 is also always located inside the sewing machine 10.

Further, the main shaft 36 is moved by the sewing machine motor 78.
When the needle rotates, the needle bar 20 reciprocates up and down by the rod 80. If the needle 24 is stopped within a predetermined angle from the uppermost position (for example, in the range of 0 degrees to 50 degrees), the needle 24 is at a height at which the threading portion 26 can thread the thread.
The balance 22 is located above the balance 22 shown by the solid line in FIG. When the predetermined angle is exceeded, the balance 22 is located below the balance 22 shown by the solid line in FIG. At this time, the needle bar 20
The movement of the threading lever 28 is blocked by the pin fixed to the sewing machine 10 so that the threading operation cannot be performed.
Is configured.

The procedure for hooking the thread T on the balance 22 of the sewing machine 10 thus constructed will be described.

For example, an operator positions the balance 22 at the uppermost position, and the opening portion 54 of the slit 52 of the balance 22 is located inside the sewing machine 10. The worker moves the yarn T along the yarn path 72 extended in the vertical direction, and the yarn T is stretched in the vertical direction on the right side of the thread balance 22 and the yarn guide member 58, as shown in FIG. Then, the worker moves backward to the yarn path 76 where the yarn T is extended in the horizontal direction, and the yarn T moves backward from the tip portion of the thread balance 22. Next, the worker moves the yarn T reaching the horizontally extending yarn path 76 to the left,
The thread T crosses over the balance 22 and the thread guide member 58. Next, the operator moves the yarn T along the yarn path 74 extending in the vertical direction toward the tip in the opposite direction. At this time,
The yarn T is in the position P1 in FIG. 7 and extends horizontally on the rear upper guide end 64. Then, when the operator pulls the yarn T downward from the horizontal direction, the yarn T descends rearward along the rear upper guide end portion 64, as shown in FIG. 11. Then, as shown at position P2 in FIG.
The thread T crosses the portion that is most rearwardly projected, and the position P in FIG.
As shown in FIG. 3, the yarn T travels forward and downward along the curve of the rear lower guide end portion 66, and the yarn T rides behind the opening 54 above the balance 22. Then, when the worker further lowers the thread T, as shown in FIG. 12, the thread T comes into contact with both the balance 22 and the rear upper guide end portion 64 and becomes in a bent state,
Then, the thread T enters the slit 52 through the opening 54. Subsequently, the worker moves the yarn T downward, and the yarn T moves along the lowermost end portion 66a of the rear lower guide end portion 66 as shown at position P4 in FIG. 7 to the front of
As shown in position P5, the thread T reaches the circular penetrating portion 50 at the tip of the balance 22, and the thread T is in the state shown in FIG.

That is, if the worker moves the yarn T along the yarn path 72, the yarn path 76, and the yarn path 74 in this order, the yarn T is moved backward beyond the opening 54 to a predetermined position, After that, the yarn T is moved forward in the opposite direction, so that the thread T can be accurately and accurately placed on the balance 22 without requiring any skill. Then, up to the needle 24 below the balance 22,
The operator moves the thread T along the thread path 74, and the operator operates the threading lever 28 to pass the thread T through the needle 24.

In the above-described embodiment, since the rear lower guide end 66 is formed along the opening 54 of the slit 52 of the balance 22 descending from the uppermost position, the lower limit of threading from the uppermost position is possible. It is likewise easy to accurately hang the thread T even on the balance 22. Furthermore, since the yarn T is guided on both the left and right sides of the balance 22, the state of the yarn T is stable. Since the thread guide member 58 is configured to guide the thread T only when the thread can be threaded, the thread guide member 58 is downsized.

In the above-described embodiment, the overhanging portion 60 is provided as a vertical surface orthogonal to the left-right direction so as to be spaced apart from the balance 22 at a constant interval. You may arrange.

In the above-described embodiment, the thread guide member 58 is arranged to guide the thread T at four positions, namely, the rear upper guide end 64 and the rear lower guide end 66 on both left and right sides corresponding to the thread guide ends. Although it is formed, thread T is
If it is not necessary to support the point and extend the yarn T, the rear lower guide end 66 on the right side may be omitted.

If the yarn T is moved along the yarn path 74 extending in the vertical direction and the yarn T is guided rearward as the yarn T moves, the yarn T is rearward at two positions on both left and right sides. Only one of the upper guide ends 64 may be provided. The rear upper guide end portion 64 is linearly inclined, but may be curved as long as the yarn T moves rearward.

Further, if the thread T is hung on the balance 22 only when the balance 22 is at the uppermost position, the thread guide member 58 is cut off at the lower rear side by the broken line in the horizontal direction shown in FIG. The protruding end 60 may be formed by providing only the rear upper guide end 64 without providing the guide end 66. In the case where the overhanging portion 60 is configured in this way, when the balance 22 is at the uppermost position for some reason (for example, the thread T passes through only one position of the balance 22 due to the mechanism of the automatic threading mechanism). It is considered possible to thread the chisel 24.

In the embodiment described above, the balance 22
The front part 32a above the slit 52 of the
2 is lowered until it faces the right side surface of the lower front portion 32b, but is not lowered until the front portion 32a above the slit 52 of the balance 22 faces the right side surface of the lower front portion 32b. The thread guide member 58 described above may be provided on the balance 22.

In the above-described embodiment, the overhanging portion 60 corresponding to the yarn guide body is provided so as to be inclined below the yarn path 76 extended in the horizontal direction. However, as shown in FIG. Insertion part 86 into which two thread holding parts 82, 84 separated in the left-right direction intersecting the extension direction of the
Is provided on the front surface of the sewing machine 10, and the projecting portion 60 is provided between the two thread holding portions 82 and 84 inserted into the inserting portion 86.
So that they are located on both sides of the thread balance 22.
May be provided in the insertion portion 86. An example of a sewing machine provided with such an insertion portion 86 and provided with thread holding members 82 and 84 in a thread cassette 90 accommodating a thread spool 88 is described in Japanese Patent Application No. 2001-172264 by the present applicant.

In the above-described embodiment, the thread guide member 58.
Although it is made of a plate material, it may be made of a similar member such as a wire member. That makes the sewing machine 10 lighter.

[0040]

As is apparent from the above description,
In the sewing machine according to claim 1, the thread guide end is inclined to the side opposite to the tip of the balance on the side of the balance, and is located further in the direction opposite to the tip than the opening of the slit of the balance. Since the lowermost end of the is open, even if the slit opening is provided in the direction opposite to the tip end of the balance, the thread can be easily hung on the balance.

In the sewing machine according to the second aspect of the present invention, the thread guide end is located below the opening of the slit and below the yarn path, so that the opening of the slit is located inside the sewing machine. However, the thread can be easily hung on the balance.

In the sewing machine according to the third aspect of the invention, the yarn guide end portion is located on the side opposite to the tip end side of the slit opening portion between the plurality of yarn holding portions to be inserted into the insertion portion. Even when the thread is stretched with, the thread can be easily hung on the balance.

In the sewing machine according to the fourth aspect of the present invention, even when the balance is lowered from the uppermost position, the portion of the thread guide end below the inclined portion is located on the side opposite to the tip of the opening of the slit. Therefore, the thread can be easily hung on the balance.

In the sewing machine according to the fifth aspect, when the thread can be threaded through the needle, the thread guiding end is located on the side farther from the tip than the opening of the slit of the balance, so the thread can be threaded through the needle. Threads can easily be hung on the balance if possible.

In the sewing machine according to the sixth aspect, since the thread guide ends are located on the opposite sides of the slit on both sides of the thread balance, the thread is guided on both sides of the thread balance and the thread state is maintained. Is stable, the thread is surely inserted in the slit, and the thread can be easily hung on the balance.

[Brief description of drawings]

FIG. 1 is an overall view of a sewing machine according to this embodiment.

FIG. 2 is a diagram showing the positional relationship between the balance of the sewing machine and the needle bar according to the present embodiment.

FIG. 3 is a diagram showing an upper surface of a balance mechanism according to the present embodiment.

FIG. 4 is a diagram showing a front surface of the balance mechanism according to the present embodiment.

FIG. 5 is a diagram showing a left side surface of the thread balance mechanism and the thread guide member according to the present embodiment.

FIG. 6 is a diagram showing front surfaces of a thread take-up mechanism and a thread guide member according to the present embodiment.

FIG. 7 is a view showing a thread hookable balance according to the present embodiment.

FIG. 8 is a diagram showing a descending process of the balance according to the present embodiment.

FIG. 9 is a perspective view of the front surface of the sewing machine according to the present embodiment.

FIG. 10 is a diagram showing a state immediately before the yarn comes into contact with the yarn guiding member according to the present embodiment.

FIG. 11 is a diagram showing a state in which a thread extends above a thread guide member according to the present embodiment.

FIG. 12 is a view showing a state in which the yarn comes into contact with a rear lower guide end portion of the yarn guide member according to the present embodiment.

FIG. 13 is a diagram showing a state in which the yarn is removed from the yarn guiding member according to the present embodiment.

FIG. 14 is a diagram showing a state in which the thread stretched by the thread holding unit according to the present embodiment is hung on the balance.

[Explanation of symbols]

10 sewing machine 18 head 22 Balance 52 slits 54 opening 58 Thread guide member 64 Rear upper guide end 66 Rear lower guide end 66a bottom end 76 Thread

Claims (6)

[Claims] 1. A balance that reciprocates up and down between an uppermost position and a lowermost position, and a balance is formed at a tip portion of the balance, and a tip end side of the balance is closed and an opposite tip end side is opened to the outside. In a sewing machine having a slit having an opening, a thread guide that is arranged on a side of the balance over a predetermined range including the uppermost position of the balance and inclines from a tip direction of the balance toward an anti-tip direction as it extends downward. A thread guide having an end, the thread guide end of the thread guide is located further in the direction opposite to the tip than the opening, and the lowermost end of the thread guide is below the uppermost position of the balance. A sewing machine that is open to the outside. 2. The sewing machine according to claim 1, wherein the thread guide end portion is provided so as to be inclined below a thread path that extends in the horizontal direction. 3. The yarn guiding end portion is an insertion portion into which a plurality of yarn holding portions separated in a direction intersecting the extending direction of the thread take-up are inserted, and the plurality of yarns inserted into the insertion portion. The sewing machine according to claim 1, wherein the sewing machine is provided between the holding portions. 4. The slanted portion of the yarn guide end is located along the locus of the opening of the slit of the balance descending from the uppermost position so as to be located on the side opposite to the tip of the opening. The sewing machine according to any one of claims 1 to 3, wherein a lower portion of the sewing machine is formed. 5. The thread guiding end portion is provided so as to be located on the side opposite to the tip end side of the opening portion when the needle that moves up and down in a predetermined phase with respect to the thread take-up position is in a position where thread can be threaded. The sewing machine according to any one of claims 1 to 4, wherein the sewing machine is provided. 6. The sewing machine according to claim 1, wherein the thread guide ends are provided on both sides of the balance.