JPH0924178A - Sewing machine threading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine threading device by which a user can quickly and easily thread sewing thread into a needle hole. SOLUTION: A suction head 18 is rotatably supported on the left end part of a sewing machine main body so that a sewing needle 14 can be stored in a storage dent formed on the suction head 18 by rotating the suction head 18. A suction hole 21 and a supply passage 22 are formed on the suction head 18, and one open end part of the suction hole 21 is formed at a position facing to the needle hole of the sewing needle 14 stored in the storage dent. The supply passage 22 is connected to an air source in a plant and so configured as to actuate suction movement through the suction hole 21 utilizing compressed air supplied therefrom. Since air stream is generated in the needle hole of the sewing needle 14 stored in the storage dent, the sewing thread 17 penetrates through the needle hole by air stream when the thread is seized by the tip and then released in the storage dent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine threading device for threading a sewing thread through a needle hole of a sewing machine.

[0002]

2. Description of the Related Art Conventionally, various types of devices such as those by mechanical operation and those using air have been provided for this type of device. As a device using air, for example, a device described in Japanese Patent Laid-Open No. 6-154461 is known. As shown in FIG. 6, an intake nozzle 2 is provided inside the sewing needle 1, and the intake nozzle 2
Is the needle hole 1 of the sewing needle 1 at the tip by the air cylinder 3.
It is displaceable between a position substantially in contact with a and a position away from it. A vacuum pump 4 is connected to the rear end of the intake nozzle 2 so that the intake nozzle 2 can perform an intake operation. When the vacuum pump 4 is driven after moving the suction nozzle 2 to a position where its tip is almost in contact with the needle hole 1a, an air flow is generated in the needle hole 1a, and the end of the suture thread is near the needle hole 1a. If the user holds the portion, the sewing thread will be sucked into the needle hole 1a.

[0003]

However, unless the tip of the intake nozzle and the needle hole are accurately aligned, the air flow to the needle hole cannot be efficiently generated, so that the accuracy of assembling the intake nozzle to the needle hole is high. Requires a high degree of sophistication. Further, unless the end portion of the sewing thread is accurately brought to the center of the needle hole, the sewing thread cannot be smoothly passed through the needle hole. The present invention has been made in view of the above circumstances, and an object thereof is to provide a threading device for a sewing machine that can quickly and easily perform threading work for inserting a sewing thread into a needle hole.

[0004]

The threading device of the present invention comprises:
A threading device for inserting a sewing thread into a needle hole provided in a sewing needle of a sewing machine, which has a housing recess for accommodating the sewing needle, and the housing recess is provided with a suction hole at a position corresponding to the needle hole of the sewing needle. An intake head having a hole formed therein and an intake portion connected to the intake hole for performing intake through the intake hole are provided, and the intake head is provided between a position for accommodating the sewing needle in the accommodating recess and a position separated therefrom. It is characterized in that it is provided so as to be displaceable (the invention of claim 1).

Further, the intake head may have a hood formed around the accommodation recess (the invention of claim 2). Further, the intake section may be formed integrally with the intake head, and may include a flow path through which the compressed air supplied from the factory air source passes, and the intake hole may be connected to the flow path. Invention of Item 3).

[0006]

According to the invention of claim 1, when the intake head is moved to accommodate the sewing needle in the accommodation recess, the needle hole of the sewing needle and the intake hole are aligned and aligned. Therefore, when the intake portion is operated to inhale, air flows into the intake hole, so that the needle hole
An airflow is generated on the intake hole side from the side opposite to the side aligned with the intake hole. Therefore, when the suture thread is picked up by the hand and the tip thereof is brought close to the needle hole and the finger is released, the suture thread is sucked into the needle hole by the air flow and is in a penetrating state. Then, the sewing operation of the sewing machine becomes possible by moving the intake head away from the sewing needle.

According to the second aspect of the present invention, since the hood is provided around the accommodating concave portion, when the intake portion is operated to inhale, an air flow is introduced into the hood from the opening side to the needle hole. Is generated. Therefore, even if the tip of the suture is not brought close to the needle hole, if the suture is released in the hood, the suture is sucked into the needle hole by the air flow and is in a penetrating state. According to the invention of claim 3, when the compressed air is supplied from the factory air source, the air in the intake hole is drawn into the flow path according to the flow of the compressed air. As a result, since the inside of the intake hole is in a negative pressure state, the air in the accommodation recess flows into the intake hole.

[0008]

As described above, according to the first aspect of the invention, the needle hole can be aligned with the intake hole only by accommodating the sewing needle in the accommodating recess, so that a high degree of assembly accuracy is required. The threading operation can be carried out quickly and easily without any trouble. Further, in the invention of claim 2, since the hood is provided, the sewing thread can be passed through the needle hole without bringing the end portion of the sewing thread close to the needle hole. Therefore, the threading operation can be performed more quickly and easily. It can be performed. Further, according to the third aspect of the present invention, since factory air can be used, it is not necessary to provide a vacuum pump or the like as in the conventional case, and it is possible to achieve downsizing of equipment and cost reduction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> A first embodiment of the present invention will be described below with reference to FIGS. The threading device for a sewing machine according to the present embodiment is applied to a known industrial sewing machine for sewing a seat cover of an automobile or the like. First, the industrial sewing machine will be briefly described.

As shown in FIGS. 1 and 2, the industrial sewing machine comprises a table 11 and a sewing machine main body 12. The sewing machine main body 12 has a left end portion in FIG. A needle bar 13 that is moved up and down according to rotation is provided. A sewing needle 14 is attached to the tip of the needle bar 13, and a cloth pressing foot 15 for pressing the cloth to be sewn is provided at a position adjacent to the sewing needle 14. Although not shown, the sewing machine body 12 is provided with a balance mechanism, a thread tension mechanism, and the like for adjusting the unwinding of the sewing thread 17, and the sewing thread 17 supplied from the spool is used for the sewing needle 1.
No. 4 needle hole 14a can be smoothly sent out.

An intake head 18 is rotatably supported at the left end of the sewing machine main body 12 provided with the needle bar 13 and the like. That is, of the left end of the sewing machine main body 12,
To the left of the needle bar 13, there is a hinge 19 on the bottom surface of the sewing machine body 12.
Is fixed, and the intake head 18 is connected to the hinge 19. Then, the intake head 18 is accommodated in the sewing position attached to the sewing needle 14 attached to the needle bar 13 from the left (the position indicated by the solid line in FIG. 1) and the accommodation position in which the intake head 18 is accommodated along the lower surface of the sewing machine body 12 ( It is rotatable with respect to a position indicated by a chain double-dashed line in FIG. 1). The sliding resistance of the hinge 19 is large, so that the intake head 18 can be held at any position in the rotation area.

As shown in FIG. 3, the suction head 18 has a sewing needle 14 on its left side surface, that is, at the suction position.
The surface on the side opposite to is a predetermined depth and is cut out toward the upper surface to form the accommodation recess 20 according to the present invention.
As shown in FIG. 4, the depth of the accommodating recess 20 is deeper than the outer diameter of the sewing needle 14, and the lateral width is formed such that the space between the opening edges is wider than the outer diameter of the sewing needle 14 and is narrower toward the inner side. And has a substantially V-shaped cross section that opens to the sewing needle 14 side. Then, when the intake head 18 is rotated to the intake position, the sewing needle 14 is inserted deep into the accommodation recess 20 and is accommodated between the side wall portions 20a in a substantially contact state. The side wall portions 20a of the housing recess 20 that are cut out in a substantially V-shaped cross section correspond to the hood according to the present invention.

Further, the intake head 18 is formed with an intake hole 21 extending obliquely downward from the accommodation recess 20 and penetrating the obliquely cut lower surface. The opening of the intake hole 21 on the accommodation recess 20 side is the intake port 21a, and its position is
The position is aligned with the needle hole 14a of the sewing needle 14 housed in the housing recess 20. Further, the opening portion on the lower surface side of the intake hole 21 is an exhaust port 21b, and the air flowing into the intake port 21a is exhausted from here. Further, at the upper part of the rear surface of the intake head 18, the air supply port 2
2a is formed, and this air supply port 22a extends straight forward and then bends downward at a right angle to supply path 2a.
2 is formed, and the supply path 22 is connected to approximately the middle of the intake hole 21. As a result, the compressed air supplied to the air supply port 22a flows into the intake hole 21 through the supply path 22 and then the discharge port 21b of the intake hole 21.
Emitted from. These configurations correspond to the intake section according to the present invention. In addition, the supply path 2 for the intake hole 21
The connection angle of 2 (angle indicated by A in FIG. 3) is approximately 105 degrees.

Further, a connecting pipe 23 is inserted into the air supply port 22a, and the connecting pipe 23 is also inserted.
An air hose 24 is connected to the. The air hose 24 is connected to an unillustrated factory air source via an air switching valve 25. A switch 26 for the air switching valve 25 is provided on the lower surface of the center of the sewing machine main body 12, and is turned on / off in accordance with the turning operation of the intake head 18.
That is, when the intake head 18 is accommodated in the accommodation position, the changeover switch 26 is pushed and turned off, and when the intake head 18 leaves the accommodation position, the changeover switch 26 is turned on. A finger hook groove 16 having a semicircular cross section is formed on the lower surface of the intake head 18 from the front surface to the rear surface, and a finger is hooked here to rotate the intake head 18 between the accommodation position and the intake position. You can do it.

Next, the operation of the present embodiment will be described.
In order to pass the sewing thread 17 through the needle hole 14a with the above structure, the following is done. First, the intake head 1 housed in the housing position
The finger is hooked in the finger hooking groove 16 of No. 8 to rotate the intake head 18 from the accommodation position to the intake position. Then, since the changeover switch 26 is turned on, the air changeover valve 25 is opened and the compressed air is supplied to the air supply port 22a. Then, the compressed air flows into the intake hole 21 via the supply passage 22 and is then discharged from the discharge port 21b. As a result, the air above the intake hole 21 is attracted to the flow of compressed air and the inside of the intake hole 21 is in a negative pressure state.
The air in the accommodating recess 20 flows into the chamber, and suction is performed by the intake holes 21.

On the other hand, when the intake head 18 is rotated to the intake position, the sewing needle 14 is inserted into the accommodating recess 20 and is accommodated between the side wall portions 20a in a substantially contact state (FIG. 4).
reference). Further, the needle hole 14a and the intake port 21a are aligned. Therefore, air is sucked into the intake port 21a from the opening side of the accommodation recess 20 through the needle hole 14a and the needle hole 14a.
An air flow will be generated in a. Further, at this time, since the side wall portion 20a of the accommodation recess 20 opens into a substantially V-shaped cross section, the air in the accommodation recess 20 is not seen in the needle hole 14a, and the air around it is not accommodated in the accommodation recess 20. Further needle hole 1
It flows so as to be attracted to 4a. Therefore, the tip of the sewing thread 17 which is going to be threaded is pinched with a finger, the tip is brought close to the needle hole 14a, and the finger is released. Then, the sewing thread 17
The tip of the needle is sucked into the needle hole 14a by passing on the air flow and penetrates. Further, the suture thread 17 is sucked into the intake port 21a, and its tip passes through the intake hole 21 and is slightly drawn out from the discharge port 21b. Since the airflow is generated not only in the accommodation recess 20 but also in the vicinity of the opening, the sewing thread 17
Even if the tip of the needle is not brought close to the needle hole 14a, if it is separated near the opening of the accommodating concave portion 20, the sewing thread 17 will ride on the air flow and
penetrate a. In this state, when the finger is again hooked on the finger hook groove 16 to rotate the intake head 18 from the intake position to the accommodation position, the changeover switch 26 is turned off and the supply of compressed air is stopped. Therefore, the tip of the sewing thread 17 sucked into the air intake port 21a is pulled out from the air intake port 21a and penetrates the needle hole 14a by a predetermined dimension, whereby the threading operation is completed and the sewing operation is immediately performed. Will be able to do.

As described above, in the present embodiment, the needle hole 14a can be aligned with the intake port 21a simply by accommodating the sewing needle 14 in the accommodating recess 20, so that a high degree of assembly accuracy is required as in the prior art. The threading operation can be carried out quickly and easily without being carried out. Also, the accommodation recess 2
0, the depth dimension is formed deeper than the outer diameter of the sewing needle 14,
Moreover, since the opening is formed in a substantially V-shaped cross section, an air flow is generated not only in the accommodating recess 20 but also in a wide range near the opening, and the end of the sewing thread 17 does not have to approach the needle hole 14a.
The sewing thread 17 can be easily passed through the needle hole 14a. Furthermore, since factory air can be used, it is not necessary to provide a vacuum pump or the like as in the conventional case, and it is possible to reduce the equipment size and cost. In addition, the accommodation recess 20
Since it has a substantially V-shaped cross section, the sewing needle 14 can be reliably brought into close contact with the side wall portions 20a regardless of the thickness of the sewing needle 14, and the intake port 21a can be aligned with the needle hole 14a.

<Other Embodiments> The difference between this embodiment and the first embodiment resides in that in this embodiment, silicone rubber is attached to the side wall surface of the accommodating recess. Since it is similar to the embodiment, the same parts are denoted by the same reference numerals and the description thereof will be omitted.

That is, as shown in FIG. 5, silicon rubber 32 is attached to the entire surface of the side wall 31a of the accommodating recess 31 cut out in a substantially V-shaped cross section. Further, the intake port 32 is provided at a position aligned with the intake port 35 of the silicone rubber 32.
a is formed. As a result, when the intake head 33 is rotated to the intake position, the sewing needle 34 is pressed against the silicone rubber 32 attached to the side wall portions 31a and is accommodated in the side wall portions 31a in a close contact state. Therefore, the sewing needle 34
Since there is no air leakage between the side wall portion 31a and the side wall portion 31a, an air flow is efficiently generated in the needle hole 34a, and the end portion of the suture thread is more smoothly drawn to the needle hole 34a.

The present invention is not limited to the above-described embodiments, but can be modified and implemented as follows, for example, and these embodiments also belong to the technical scope of the present invention. (1) In each of the above embodiments, the compressed air from the factory air source is used to perform the suction action, but the suction action may be performed by connecting the suction hole to the vacuum pump. Good.

(2) In each of the above embodiments, the accommodation recess 2
Nos. 0 and 31 were notched so as to have a substantially V-shaped cross section, and the side wall portions 20a and 31a thereof constituted a hood, but the accommodating concave portion is merely deep enough to accommodate a sewing needle. It may be cut out, or may be cut out so that both side wall portions are parallel to each other. In short, when the sewing needle is accommodated in the accommodation recess, the needle hole and the intake port are aligned with each other. It should be like this.

(3) In each of the above embodiments, the sewing needle 14 is 1
Although it was applied to a sewing machine of a book, it can also be applied to a sewing machine provided with two sewing needles so that double stitch sewing can be performed. In that case, the intake head corresponds to each sewing needle. Two pieces may be provided, or two accommodation recesses may be formed in one intake head. In addition, the present invention can be implemented with various modifications without departing from the scope.

[Brief description of drawings]

FIG. 1 is a front view showing the whole of the present embodiment.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view showing an intake head.

FIG. 4 is a cross-sectional view showing a housing recess.

FIG. 5 is a cross-sectional view showing an accommodation recess according to another embodiment.

FIG. 6 is a perspective view showing a conventional example.

[Explanation of symbols]

 14 ... Sewing needle 14a ... Needle hole 18 ... Intake head 20 ... Receiving recess 20a ... Side wall (hood) 21 ... Intake hole 22 ... Supply path (flow path)

Claims (3)

[Claims] 1. A threading device for inserting a sewing thread into a needle hole provided in a sewing needle of a sewing machine, the device including a storage recess for storing the sewing needle, and the storage recess having the storage needle in the storage recess. An intake head having an intake hole formed at a position facing the hole, and an intake part connected to the intake hole for performing intake through the intake hole are provided, and the intake head has the sewing needle in the accommodation recess. A threading device for a sewing machine, wherein the threading device is provided so as to be displaceable between a housing position and a position away from the housing position. 2. The intake head has a hood formed around the accommodation recess.
A threading device for the sewing machine described. 3. The intake section is integrally formed with the intake head and has a flow path through which compressed air supplied from a factory air source passes, and the intake hole is connected to the flow path. The threading device for a sewing machine according to claim 1 or 2, wherein