JPH07671A - Sewing thread guiding device and threading device with sewing thread guiding device - Google Patents

Abstract

PURPOSE:To guide and momentarily pass a thread to a sewing machine needle. CONSTITUTION:A machine sewing thread guide device, which can be easily mounted on a sewing machine body by a main spindle, is formed of a thread fixing holding plate 11, a thread guide board 12, a thread guide plate 13, and an operating cylinder 30 for operating these plates. A thread is nipped by the thread fixing holding plate 11 and a thread fixing holding plate stop lever 15 provided on the thread guide board 12, guided near a sewing machine needle 2 by the thread guide plate 13, and passed into a needle hole by a thread suction capsule 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device which is attached to a sewing machine, guides the thread through a hole of a sewing machine needle, and passes the thread through the sewing machine needle.

[0002]

2. Description of the Related Art Conventionally, a thread is passed through a sewing needle by stopping the sewing machine and using the eyes and fingers of a person.

[0003]

It takes skill to stop the sewing machine and pass the thread through the sewing machine needle by the eyes and fingers of a person.
In addition, there is a problem that even a skilled person takes time because it needs to be performed in a narrow place. In particular, in recent years, sewing machines have been sped up, and thread breakage during start-up and operation or threading time due to thread replacement is lost and the operating rate of the sewing machine is reduced.

It is an object of the present invention to provide a sewing machine thread guiding device that allows a thread to be threaded through a sewing machine needle instantly during starting and during operation of the sewing machine.

[0005]

According to the first aspect of the present invention, (a) a main shaft is mounted in the vicinity of a sewing machine needle of a sewing machine main body in parallel with the sewing machine needle by a plurality of mounting portions, and (b) a mounting nut is attached to a lower end of the main shaft. Of the thread guide base plate having a thread fixing grip plate stop lever fixed vertically to the main shaft by means of a thread fixing base plate, a recess for guiding the thread, and an operating cylinder mounting portion; And a thread fixing plate that is rotatably attached to the main shaft by a mounting nut on the side, and in which (c1) the operating rod performs an operation recess for rotating around the main axis, and (c2) the thread fixing plate. A thread fixing grip plate having a spring for elastically urging in the direction of the grip plate stop lever, and (d) on the other side of the thread guide base, rotatably mounted on the spindle by a mounting nut. A thread guide plate having (d1) an operating hole that makes a rotational movement around the main shaft by the actuating rod, (d2) a thread guide plate that guides the thread, and (e) an operating portion. (E1) An operating ring having a piston operated by air pressure inside (e1) and (e2) a piston, the tip of which is inserted into the operation recess of the thread gripping fixing plate and the operation hole of the thread guiding plate, (F) a switching device (f1) a conversion means for converting the linear motion of the piston into a rotation, and (f2) the conversion. A cam which is rotated by the means and which is capable of moving the working cylinder in parallel to the working cylinder mounting portion and which is mounted vertically to the main shaft; and (f3) the cam which rotates coaxially with the cam, And a switching device including a switching valve that switches the air pressure to be sent to the sewing machine.

The second aspect of the present invention is (a) one rectangular surface comprising a long side and a short side of a metal rectangular parallelepiped.
1) A triangular prism-shaped groove provided in the direction orthogonal to the long side in the vicinity of one end in the long side direction, and (a2) a plurality of thread grips provided on the top line of the groove and in the vicinity thereof. A hall,
(A3) One surface provided with a thread guide having a concave curve whose top line extends toward the one surface at one end of the groove, and (b) the plurality of thread gripping holes. A first hole which communicates with the first surface and is orthogonal to the first surface and reaches the second surface;
A filter inserted near the thread gripping hole of the first hole,
(B2) a first hole having a fixing screw screwed into an inner screw engraved near the other surface; and (c) communicating with the first hole and orthogonal to the first hole and made of metal. A communication hole formed to reach a surface formed at the other end of the rectangular parallelepiped in the long side direction, and (d) Carved in the vicinity of the surface formed at the other end of the connection side in the long side direction. The sewing machine thread guiding device is composed of a suction tube screwed with an inner screw.

Further, the third invention is a threading device for sucking a thread through a needle hole of a sewing machine needle by a suction hole of a suction capsule, and a pair of springs for elastically urging in a closing direction which can be opened and closed left and right. Of the door, the needle guide groove provided at the joint between the left and right doors, the trumpet-shaped thread guide hole where the front surface of the door is largely provided from the front surface of the door to the suction hole, and the guide hole from the needle guide groove. A threading device with a sewing thread guiding device, characterized in that a door including means for fixing the needle hole of the sewing machine needle near the suction hole is provided on the front surface of the threading device.

[0008]

According to the first aspect of the present invention, the main shaft is provided in the vicinity of the sewing machine needle in parallel with the sewing machine needle, the guide base is fixed to the main shaft perpendicular to the main shaft, and the thread fixing and holding plate and the thread guiding plate are provided on both sides thereof. And are rotatably mounted around the spindle. Then, both plates are rotated by the actuating section that is actuated by air pressure, and the thread guide base and both plates form a triangular thread guide section. Suspend a sufficient length of thread in the thread guide section, remove the operating section from the operation recess of the thread fixing and gripping plate with a cam, and rotate the thread fixing and gripping plate in the direction of the thread fixing and gripping plate stop lever using spring force. As expected. At this time, the thread is fixed by being sandwiched between the thread fixing and holding plate and the stop lever. Next, the thread guide plate is rotated in the direction of the sewing machine needle by the operation unit to guide the thread to the sewing machine needle. Next, the suction capsule is brought to the opposite side to the thread of the sewing machine needle, and the thread is sucked together with air through the needle hole and passed through the needle hole. After the thread passes, the thread fixing grip plate and the thread guiding plate are returned to their original positions again by the cam and the operating portion. Further, while the sewing machine is used, the thread is supplied from the triangular thread guide portion.

According to the second aspect of the invention, the sewing thread is sucked and gripped by the suction tube through the communication hole and the first hole in the front surface of the thread gripping hole, and the tip of the sewing thread is guided along the thread guide. The sewing machine thread guiding device is fixed substantially orthogonal to one surface of a rectangle having long sides and short sides. Next, when the needle hole of the sewing machine needle is installed in the suction hole of the suction capsule and brought close to the tip of the sewing machine thread, the thread is sucked together with air through the needle hole and the sewing machine thread is passed through the needle hole.

According to the third aspect of the present invention, a pair of openable and closable doors provided on the front surface of the suction capsule are opened by pressing the sewing machine needle into the needle guide groove, and the sewing machine needle comes to a predetermined position. At this time, the door is closed by the elastic force of the spring, the needle hole of the sewing machine needle is fixed in the vicinity of the suction hole, and the thread from the trumpet-type thread guide hole provided from the front surface of the door to the suction hole through the needle hole. Is sucked into the suction hole, and the thread is passed through the sewing machine needle. In this case, it is preferable to use the yarn guiding device of the second invention together with the yarn guiding hole to guide the yarn.

[0011]

The present invention will be described more specifically with reference to the following examples.

FIG. 1 is an overall view showing the relationship among a sewing thread guiding device 10, a sewing needle 2 and a suction capsule 40, which is an embodiment of the first invention. FIG. 2 is a side view thereof. The sewing machine thread guide device 10 is attached to the sewing machine body 1 by a spindle attachment portion 4 in parallel with a sewing machine needle 2 that hangs down from the sewing machine body 1 via a needle bar 3. At the lower end of the main shaft 5, the thread fixing grip plate 11 and the thread guide base 1 are arranged from above.
2. The thread guide plate 13 is inserted and attached with the nut 6. As shown in FIG. 4, the main shaft insertion portion 7 to be inserted into the base 12 and the plates 11 and 13 has a hexagonal shape, and as shown in FIG. 3, the insertion hole 22 of the main shaft 5 in the thread guide base 12 is It has a hexagonal shape and is adapted to fit with the main shaft insertion portion 7. On the other hand, both plates 11, 13
The insertion holes 21 and 23 are circular, which is larger than the hexagonal shape of the main shaft 5, and both plates 11 and 13 are rotatably attached about the main shaft 5. At the tip of the main shaft insertion portion 7, there is provided a screw portion 8 having an outer screw whose diameter is smaller than that of the insertion portion 7, and a nut 6 is screwed into the screw portion 8 to attach the base 12 and the plates 11 and 13 to the main spindle. Mount vertically on 5.

As shown in FIG. 3B, a thread fixing grip plate stop lever 15 is attached to the upper surface of the thread guide base 12, and a spring 16 provided between the thread fixing grip plate 11 and the base 12 is used. The movement of the thread fixing grip plate 11 is prevented. When the sewing machine is in use, the thread fixing plate 11 and the thread guiding plate 13 below the base 12 in a state almost overlapping with the sewing machine are in the state shown in FIG. And is supplied through a triangular thread guide hole 17a formed by both plates 11 and 13.

The base 12 has an operating cylinder mounting portion 18 to which an operating cylinder 30 is mounted via a cam 19. The cylinder 30 has a piston 31 that is pneumatically actuated, and an actuation rod 32 is attached to the piston 31. The tip of the actuating rod 32 has an operation recess 24 in the thread fixing and gripping plate 11 and an operation hole 25 in the thread guiding plate 13.
The stopper 33 prevents the stopper from slipping out of the operation hole 25. Further, as shown in FIG. 5, a connecting rod 34 and a crank 35 are connected to an intermediate point of the actuating rod 32, whereby the reciprocating operation of the actuating rod 32 is converted into a circular motion indicated by a chain line. This circular motion is transmitted to the upper cam 29, and the shape of this cam 29 causes the thread guide base 1
The distance between the second working cylinder mounting portion 18 and the cylinder 30 is changed, and the cylinder 30 and the working rod 32 are moved in parallel. An air pressure switching valve (not shown) is provided under the cam 36, and switches the air pressure applied to the spring 36 side (upper part in FIG. 5) of the piston 31. A spring 36 is attached to the piston 31, and the piston 31 elastically biases the piston 31 toward the spring 36 side when no air pressure is applied to the spring 36 side.

Next, the operation of threading the thread 9 through the sewing machine needle 2 using the sewing machine thread guide device 10 will be described. Thread guide base 1
2, the thread fixing and holding plate 11 and the thread guiding plate 13 which is substantially overlapped with this are in the state shown in FIG. Thread the base into angular recesses 17 in the base 12 and the two plates 11, 13
The thread guide hole 17a having a triangular shape. FIG. 6A is a sectional view taken along line VV of FIG. 1 in this state. Here, the air supply port 37 of the operation cylinder is connected to the compressed air source, and the suction capsule 40 is brought near the needle hole 2a of the sewing machine needle 2. In this state, the pneumatic pressure switching valve that is coaxial with the cam 29 is closed, and no pneumatic pressure is applied to the operating cylinder 30. Next, the operation switch 39 is pushed to rotate the cam 29 slightly. As a result, the distance between the working cylinder mounting portion 18 of the base 12 and the working cylinder 30 is expanded, and the working rod 3
2 separates from the base 12 and comes out of the operation recess 24 of the thread fixing and gripping plate 11. The thread fixing grip plate 11 is the spring 1
6 comes to the position of the thread fixing and gripping plate stop lever 15 in a short time, for example, 0.1 seconds, and at the position of the apex 17b of the thread guide hole 17a, the thread is fixed and gripped as shown in FIG. 6 (b). It is fixed between the plate 11 and the stop lever 15.
When the cam 29 slightly rotates, the air pressure switching valve coaxial with the cam 29 opens, and air enters from the spring 36 side of the piston 31 to move the piston 31 against the spring 36. The air on the side of the working rod 34 of the piston 31 has a pressure equalizing port 3
Emitted from 8. This moves the actuation rod 34,
The thread guide plate 13 is moved to the vicinity of the sewing machine needle 2, and the thread is guided to the guide groove 19 provided in the thread guide plate 13, and the thread is held from under the base 12 near the needle hole 2a of the sewing machine needle 2. come. As shown in FIG. 6 (c), the thread is the suction capsule 4 here.
At 0, it is sucked together with the surrounding air and passes through the needle hole 2a. When the thread guide plate 13 reaches the position closest to the sewing machine needle 2, the air pressure switching valve coaxial with the rotating cam 29 is closed by the operating rod 34, and the air pressure does not operate on the piston 31. When the air pressure does not act on the piston 31, the spring 31 pulls the piston 31 toward the piston 36. At this time, the air on the spring 36 side is transferred to the piston 3
1 is discharged from the space between the cylinder 1 and the cylinder 30 or from a pressure equalizing port (not shown) provided in the air pressure switching valve.

When the piston 31 is pulled by the spring 36,
The actuating rod 34 also moves at the same time, and the yarn guiding plate 13 is rotated by its operation hole 35 in the direction of returning to the position of FIG. When the yarn guiding plate 13 and the yarn fixing and gripping plate 11 overlap with each other during this process, the rotation of the cam 29 narrows the gap between the operating cylinder mounting portion 18 and the operating cylinder 30, so that the operating cylinder 30 is attached to the yarn guide base 1
The parallel movement in the direction 2 causes the tip of the actuating rod 32 to enter the operation recess 24 of the thread fixing and gripping plate. After that, actuating rod 34
Rotates both plates 11 and 13 back to the position shown in FIG. When the state shown in FIG. 1 is reached, the spring 36 in the cylinder 30 loses its elastic force, and the piston 31 stops at this position. After pressing the operation switch 39, the piston 31
Is a short time of 3 to 4 seconds. After that, the compressed air source and the air supply port 37 of the cylinder are disconnected, and the yarn suction capsule 40 is removed.

An example of the yarn suction capsule 40 is shown in FIG. When the compressed air is connected to the connection port 42 of the yarn suction capsule 40, the compressed air is ejected from the nozzle 43 and the suction pipe 44
To a negative pressure. Thereby, the air is sucked from the suction hole 41. In this state, the suction hole 41 of the thread suction capsule 40 is roughly aligned with the needle hole 2a of the sewing machine needle 2, and when the thread 9 is guided near the needle hole 41 by the sewing machine thread guiding device 10, the thread passes through the needle hole 2a. The yarn is drawn into the suction tube 44 of the yarn suction capsule. Here, if the thread suction capsule 40 is removed, the thread 9 passes through the needle hole 2a.

In the present embodiment, the main shaft 5 is fixed to the sewing machine main body 1. However, the main shaft 5 is constructed so that the main shaft can be moved up and down. When the sewing machine is in operation, it moves to the main body side (upper side in FIG. 2) for sewing machine operation. It may be out of the way. Further, the thread suction capsule 40 may be movable together with the sewing machine thread guiding device. The yarn suction capsule is not limited to the one shown in FIG. 7 and may be any one having such an action.

FIG. 8 is a perspective view of a sewing thread guiding device 100 which is an embodiment of the second aspect of the present invention, and FIG. 9 is a side sectional view taken along the section line IX-IX in FIG. 10 is shown in FIG.
It is a horizontal sectional view seen from the section line XX of FIG. This device 1
The shape of 00 is a rectangular parallelepiped shape having long sides a, middle sides b, and short sides c. One rectangle 101 having a long side a and a short side b
A triangular prism-shaped groove 103 is provided in the vicinity of one end 102 on the surface in the direction perpendicular to the long side a. This groove 10
A plurality of (four in this embodiment) thread holding holes 105 are formed on and near the top line 104 of No. 3. Further, one end of the top line 104 constitutes a thread guide 106 having a concave curve toward the surface 101.

A surface 1 communicating with a plurality of thread gripping holes 105.
A first hole 110 orthogonal to 01 and reaching the other surface 111 is formed, and a filter 112 is inserted near the thread gripping hole 105 of the first hole 110. In addition, the first hole 110
An inner screw is engraved on the other surface 111 side, and a fixing screw 113 is screwed into the inner screw. Further, a communication hole communicating with the first hole 110 and orthogonal to the first hole 110 and reaching the surface 116 formed at the other end in the long side a direction is formed. Communication hole 11
An inner thread is engraved near the surface 116 of No. 5, and a suction tube 117 is screwed to the inner thread. Two mounting holes 121 and 122 are inserted perpendicularly to the surface 120 formed by the long side a and the middle side b.

To guide the sewing thread 9 using the apparatus 100, the suction tube 117 is connected to a suction means such as a suction pump, and the sewing thread is hung substantially along the top line 104 of the groove 103. The sewing machine thread 9 has a thread holding hole 1 as shown in FIG.
05, and the tip 9a is sucked by the thread guide 106.
Projects substantially perpendicularly to the surface 101. This is sucked by the suction capsule 40 through the needle hole 2a similarly to the device 10 of the first invention, and the sewing thread is passed through the needle hole. The device 100 is
Threading device 50 with sewing machine thread guiding device described in the third invention
Is preferably used in combination, and the operation in the case of combined use will be described later.

FIG. 11 is a plan view of a threading device 50 with a sewing machine thread guiding device according to an embodiment of the third invention.
2 is the front view. A threading device 50 with a sewing thread guiding device includes a sewing thread guiding portion 51 and a suction capsule body 60.
Composed of and. The sewing machine thread guide portion 51 includes a pair of doors 52 and 53 that can be opened and closed to the left and right, springs 56 and 57 that elastically bias the doors 52 and 53 in the closing direction, and needles provided at the joints of the left and right doors 52 and 53. The guide groove 59 and the trumpet-shaped yarn guide hole 58 provided at substantially the center of the left and right doors 52 and 53.
The thread suction capsule body 60 has substantially the same configuration as the thread suction capsule 40 described with reference to FIG. 7.

When the sewing machine needle 2 is pressed into the needle guide groove 59 of the device 50, the left and right doors 52 and 53 are rotated by the needle 2 against the springs 56 and 57 about the fixing pins 46 and 47 as axes. It is pressed. When the needle 2 comes to the predetermined position shown in FIG. 11, the doors 52 and 53 are closed by the elastic force of the springs 56 and 57, and the needle 2 is fixed to the predetermined position by the doors 52 and 53. Next, when the compressed air is connected to the connection port 62 of the main body 60, the compressed air is ejected from the nozzle 63, the negative pressure is applied to the suction pipe 64 by the momentum, and the compressed air is discharged from the discharge port 65. When the thread is brought near the thread guide hole 58 in this state, the thread is sucked into the device 50 and passes through the needle hole. By pressing the device 50 against the sewing machine needle 2 on the cloth pressing plate 67 with the cloth pressing plate 67 raised, the positions of the needle holes can be aligned.

FIG. 13 is a plan view of another embodiment of the third invention. In this embodiment, the pair of doors 52 and 53 operate in the opening direction by the force of compressed air. Cylinders 54 and 55 are provided corresponding to the left and right doors 52 and 53, and valves 48 and 49 are provided.
The compressed air is sent to the cylinders 54 and 55 via the door 5
By opening 2, 53 and closing the valves 48, 49, the pressure in the cylinder is released, and the doors 52, 53 are closed by the elastic force of the springs 56, 57.

FIG. 14 shows a sewing machine thread guiding device 1 of the second invention.
It is explanatory drawing explaining the operation at the time of using together 00 and the threading device with sewing machine guidance device 50 of 3rd invention. In this case, the rotary shaft 13 is provided in the vicinity of the sewing machine needle 9 substantially parallel to the sewing machine needle 9.
1 is set. Then, the mounting member 132 perpendicular to this is fixed. The sewing thread guiding device 100 of the second invention is attached to the attaching member 132 by attaching means such as attaching holes 121 and 122.
It can be fixedly installed by inserting bolts, etc. Also, a threading device 50 with a sewing thread guiding device
Compressed air is connected to the connection port of the sewing machine and the sewing machine needle 2
The threading device 50 with the sewing machine thread guiding device is attached to. As a result, the discharge port 65 becomes a negative pressure, and the branch pipe 66 branched to the discharge port 65 and the suction pipe 117 of the sewing machine thread guide device 100 are connected. The sewing thread guiding device 100 is
First, it is at the position shown by the one-dot chain line, and here the sewing machine thread 9 is suspended along the top line 104 of the groove 103, and the tip 9a of the thread 9 is brought into the state shown in FIG. When the sewing machine thread guide device 100 is rotated 90 ° by the rotary shaft 131 and brought to the position indicated by the solid line, the sewing machine thread 9 is sucked into the sewing machine thread guide device 50 through the needle hole 2a. Be done. Here, the doors 52 and 53 are opened, the threading device 50 with a sewing thread guiding device is removed from the sewing machine needle 2, and the supply of compressed air to the connection port 62 is cut off.

As described above, the sewing machine thread guiding device 1 of the second invention
When 00 and the threading device 50 with the sewing machine thread guiding device are used together, the sewing machine threading can be performed easily and quickly. The threading device 50 with a sewing thread guiding device may be used alone or in combination with the sewing thread guiding device 10 of the first invention.

[0027]

As described above, according to the present invention, the thread is guided near the sewing needle without manually passing the thread through the sewing needle as in the conventional case, and the thread suction capsule or the thread guiding device is provided. With a completely new method of sucking with a threading device, the thread can be passed through the needle hole in a few seconds.

[Brief description of drawings]

FIG. 1 is a plan view showing a relationship among a sewing thread guiding device 10, a sewing needle 2 and a suction capsule 40, which is an embodiment of the first invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a main part of the sewing machine thread guiding device 10, a thread fixing and holding plate 11, a thread guide base 12, and a thread guiding plate 13.
FIG.

FIG. 4 is a thread fixing grip plate 11, a thread guide base 12,
It is a figure which shows the relationship between the thread guide plate 13 and the spindle 5.

FIG. 5 is an enlarged sectional view of a working cylinder 30.

FIG. 6 is an explanatory view of an operation of passing the thread 9 through the sewing machine needle 2 by using the sewing machine thread guiding device 10.

FIG. 7 is a sectional view showing an example of a yarn suction capsule 40 used in the first invention.

FIG. 8 is a perspective view of a sewing thread guiding device 100 of the second invention.

9 is a side cross-sectional view taken along section line IX-IX in FIG.

FIG. 10 is a horizontal cross-sectional view taken along the section line XX of FIG.

FIG. 11 is a plan view of a threading device 50 with a sewing machine thread guiding device that is an embodiment of the third invention.

FIG. 12 is a front view of a threading device 50 with a sewing machine thread guiding device.

FIG. 13 is a plan view of another embodiment of the third invention.

FIG. 14 is a plan view showing the relationship between the sewing machine thread guiding device 100 of the second invention and the threading device with sewing machine thread guiding device 50 of the third invention in combination.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing machine main body 2 Sewing needle 5 Spindle 9 Thread 10 Sewing machine thread guiding device of the first invention 11 Thread fixing and holding plate 12 Thread guide base 13 Thread guiding plate 15 Thread fixing and holding plate stop lever 19 Guide groove 24 Operation recess 25 Operation hole 30 Operating cylinder 31 Piston 32 Operating rod 39 Operation switch 40 Thread suction capsule 50 Threading device with sewing machine thread guiding device 51 Sewing machine thread guiding part 52,53 Door 54,55 Cylinder 56,57 Spring 58 Thread guiding hole 60 Thread suction capsule body 100 Sewing machine thread guiding device 103 of the second invention 103 Groove 104 Top line 105 Thread gripping hole 106 Thread guide

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeo Ishii, 1-5-9 Nishihonmachi, Nishi-ku, Osaka-shi, Osaka Prefecture Oscar Kiko Co., Ltd. (72) Inventor Tadashi Sugiyama 2-13-7 Nakayamadai, Takarazuka-shi, Hyogo issue

Claims (3)

[Claims] 1. A main shaft, which is mounted in parallel with a sewing machine needle by a plurality of mounting portions in the vicinity of a sewing machine needle of a sewing machine main body, and (b) is fixed vertically to the main shaft by a mounting nut at the lower end of the main shaft, and has its upper surface. (3) A thread guide base having a thread fixing grip plate stop lever fixed to the base, a recess for guiding the thread, and an operating cylinder mounting portion, and (c) one side of the thread guide base, which is rotatable by a mounting nut. A thread fixing and gripping plate attached to the main shaft, wherein (c1) an operating rod elastically urges in the direction of an operation recess for rotating around the main shaft and (c2) a thread fixing and gripping plate stop lever. A thread fixing and holding plate having a biasing spring, and (d) a thread guiding plate on the other side of the thread guide base, which is rotatably mounted on the spindle by a mounting nut, d1) a thread guide plate having an operation hole that rotates about the main shaft as an axis by the actuation rod, (d2) a guide groove that guides the thread, and (e) an actuating part, in which (e1) pneumatic pressure is applied. (E2) is connected to the piston, the tip of which is inserted into the operation recess of the thread gripping fixing plate and the operation hole of the thread guiding plate, and both plates are rotated around the main shaft by the movement of the piston. (F) a switching device for converting linear motion of a piston into rotation, and (f2) a cam rotated by the conversion device. A cam that can move the working cylinder in parallel to the working cylinder mounting part and that is mounted vertically to the main shaft, and (f3) a switch that switches the air pressure sent to the working cylinder by rotating coaxially with the cam. Sewing thread guiding device which comprises a switching device consisting of a valve. 2. A metal rectangular parallelepiped having a rectangular side composed of a long side and a short side, wherein (a1) a long side in a direction orthogonal to the long side in the vicinity of one end. The triangular prism-shaped groove provided, (a2) a plurality of thread gripping holes drilled on and near the top line of the groove, and (a3) the top line of the groove at one end of the groove. One surface provided with a thread guide formed of a concave curve toward the one surface; and (b) a surface that communicates with the plurality of thread gripping holes and that is orthogonal to the one surface and reaches the other surface. 1 hole, (b1)
A filter inserted near the thread gripping hole of the first hole,
(B2) a first hole having a fixing screw screwed into an inner screw engraved near the other surface; and (c) communicating with the first hole and orthogonal to the first hole and made of metal. A communication hole formed to reach a surface formed at the other end of the rectangular parallelepiped in the long side direction, and (d) Carved in the vicinity of the surface formed at the other end of the connection side in the long side direction. A sewing thread guiding device including a suction tube screwed to an inner screw. 3. A threading device for sucking a thread through a needle hole of a sewing machine needle by a suction hole of a suction capsule, comprising a pair of doors having springs for elastically urging in a closing direction which can be opened and closed left and right. , A needle guide groove provided at the joint of the left and right doors, a trumpet type thread guide hole with a large front surface of the door extending from the front surface of the door to the suction hole, and a sewing machine needle guided from the needle guide groove. A threading device with a sewing machine thread guiding device, characterized in that a door including means for fixing the needle hole near the suction hole is provided on the front surface of the threading device.