JPS5836400Y2 - sewing machine threading device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a threading device for a sewing machine that threads thread through the needle hole of a needle attached to the sewing machine body.

Examples of conventional threading tools include those shown in FIGS. 1 and 2.

Reference numeral 1 in FIG. 1 is a threading tool, which is formed separately from the sewing machine main body 2.

This threading tool 1 includes a grip part 3 and a grip part 3.
It consists of a more protruding elastic loop part 4, and the tip 5 of this loop part 4 can be freely inserted into the needle hole 7 of the needle 6.

The needle 6 is attached to the lower end of a needle bar 9 supported by an arm 8 of the sewing machine body 2 via a needle presser 10, with the needle hole 7 positioned in the left-right direction (directions A and B in the figure).

Then, the tip 5 of the loop portion 4 is passed through the needle hole 7 from the left and right directions, and after inserting the thread 11 into the tip 5, the loop portion 4 is pulled out from the needle hole 7, so that the thread 11 is passed through the needle hole 7. I have to.

In addition, 12 in the figure is a presser bar located on the rear side of the needle bar 9.

In addition, in the threading tool 13 shown in FIG. 2, a hook portion 15 is provided to protrude from the grip portion 14, and the hook portion 15 is inserted into the needle hole 7, and the thread 11 is hooked and pulled out. The thread 11 is passed through.

However, since such conventional threading tools 1 and 13 are formed separately from the sewing machine main body 2, an operator must grasp the threading tools 1 and 13 and insert the loop portion 4 or hook portion of the threading tools 1 and 13. 15 must be inserted into the needle hole 7, and although this makes threading work a little easier than passing the thread 11 directly through the needle hole 7,
The loop part 4 or the hook part 15 was simply replaced, and the point of penetrating the small needle hole 7 was the same, and the difficulty of the work could not be completely eliminated.

Moreover, in a sewing machine where the needle hole 7 is located in the left-right direction (direction A and B in the figure) as shown in FIGS. 1 and 2, the needle 6
Threading is relatively easy because there is sufficient space on both sides of the needle 6 and the presser bar 12 located on the rear side of the jigsig sewing machine, in which the needle hole 7 is located in the front and back direction.
There was a problem in that threading had to be carried out in a narrow space between the two, making the work difficult.

Further, as in JP-A No. 55-21979, the hook needle has a hook portion at the tip, two guides sandwiching the hook, and a holder that supports the hook needle and the guide. There are also known guides in which the tips of the guides are bent outward, but although this makes it slightly easier to insert the hook needle into the needle hole than in the conventional example, it is still the same as the conventional example in zigzag sewing machines. There is a problem with this.

Furthermore, instead of using a threading tool separate from the sewing machine body as described above, as in Japanese Patent Application Laid-Open No. 54-72151, the threading support rod is rotated to an appropriate position of the arm mechanism in which the needle bar is supported. A support rod that is freely provided, has a threading piece that slides hiddenly in the needle hole penetrating direction at the tip of the support rod, and also has a contact piece for a fixed portion of the needle bar that rotates downward. There is a known attachment in which the thread pushing piece is guided in the needle hole by guiding the contact piece in the vertical direction and bringing the contact piece into contact with a fixed part of the needle bar. Since it only slides in the direction and rotates by the support rod, it cannot be installed in the narrow area between the presser bar and the needle bar, and therefore it has to be installed exposed to the outside, which can be a nuisance. There was a problem with that.

This idea was developed by focusing on these conventional problems.The presser foot bar is located behind the needle bar, and the needle bar has a needle that passes through the needle hole in the front-rear direction. The threading section is movably supported via a control means, the threading section is interposed between the presser bar and the needle, and the threading section is inserted into the needle hole from the rear to introduce the thread into the needle hole. The support control means includes a support member fixed to the sewing machine body between the needle bar and the presser bar, and a support penetrating the support member so as to be slidable and rotatable in the left and right directions. and an operating arm fixed to one end of a shaft whose sliding and rotational positions are regulated by engaging a control groove formed in the support member, and which can freely intervene between the presser bar and the needle; The above-mentioned threading section has a hook provided at the tip of the operation arm that can penetrate into and detach from the needle hole to freely introduce the thread into the needle hole, and a pair of needle position correction hooks on both sides of the hook, one of which protrudes slightly from the other. The object of the present invention is to solve the above-mentioned conventional problems by making it an attachment and making threading easier even in a narrow space between the needle and the presser bar.

This invention will be explained below based on the drawings.

3 to 12 are diagrams showing an embodiment of this invention.

Note that, in the following, parts similar to those of the conventional system are indicated by the same reference numerals, and redundant explanation will be omitted.

First, to explain the configuration, this threading device 16 mainly consists of a threading section 17 and support control means 18.

The threading section 17 includes a hook 19 and a pair of guide plates 20.21 provided opposite to each other on both sides of the hook 19.
9 a , 20 a , and 21 a are polymerized and combined integrally.

The hook 19 penetrates into the needle hole 7 of the needle 6 and leaves the needle hole 7.
It is for introducing the thread 11 into the needle hole 7, and has a thickness that allows it to penetrate into the needle hole 7, a length that allows the tip 22 to protrude from the needle hole 7 and engage with the thread 11, and a space between both guide plates 20 and 21. The guide plates 20 and 21 are provided at approximately the center thereof and at positions corresponding to the lower sides of both guide plates 20 and 21.

Both guide plates 20 and 21 correct the position of the needle 6 before one hook penetrates into the needle hole 7 so that the position of the hook 19 matches the position of the needle hole 7, and serve as a guide for the penetration of the hook 19. The two guide plates 20, 21 are opposed to each other with a distance 11 corresponding to the diameter of the needle 6.

Further, one guide plate 20 is made to have approximately the same length as the hook 19, and the other guide plate 21 is formed to have a length that projects from the guide plate 20 by a distance of 12.
1 is mainly used for adjusting the position of the needle 6 (see FIG. 10).

Further, the guide plate 20 has an outwardly bent portion 23 at the tip,
This bent portion 23 serves as an introduction guide for the needle 6.

Further, the guide plate 20 has a recessed lower side near the tip 22 of the hook 19 to enable engagement of the thread 11 with the tip 22 of the hook 19, and has a hook 24 for the thread 11 protruding from the lower side. There is.

The support control means 18 connects the threading section 17 to the sewing machine main body 2.
The threading section 17 is supported movably against the presser bar 1.
2 and the needle 6, the support member 25 is fixed to the sewing machine main body 2, and the support member 2
5 through a shaft 26 and supporting the threading section 17.

The support member 25 includes a plate portion 28 and this plate portion 28
A shaft support portion 31 consisting of bent portions 29 and 30 formed opposite to each other on the left and right sides of the sewing machine, and a mounting portion 32 formed to protrude upward from the bent portion 29, and this mounting portion 32 is fixedly attached to the sewing machine body 2. At the same time, the shaft support portion 31 is located between the needle bar 9 and the presser bar 12.

In the illustrated example, the attachment part 32 is fixed to the side surface 34 of the jaw 33 of the arm 8 of the sewing machine main body 2, but the attachment part 32 is not limited to this, and may be fixed to the bottom surface of the jaw 33, or can be arbitrarily selected.

In addition, the shaft support portion 31 is provided with shaft through holes 35 and 36 at positions corresponding to the bent portions 29 and 30, and the shaft 26 is supported in the left and right direction (see FIG. 4A and FIG. Loosely fit and support in direction B).

Furthermore, the shaft support part 31 engages the plate part 28 with a pin 37 formed protruding from the shaft 26, so that the shaft 26
It is provided with a control groove 38 for regulating the movement of.

This control groove 38 includes a slide groove 38a provided across the left and right direction of the plate portion 28, and a slide groove 38a provided in the left and right direction of the plate portion 28.
The rotation groove 38B is formed continuously on the lower side at the left end of the slide groove 38B, and the rotation groove 38C is continuously provided on the upper side at the right end of the slide groove 38H. It allows you to freely leave.

Furthermore, the plate portion 28 of the shaft support portion 31 is provided with a leaf spring 39 that comes into contact with the shaft 26 and holds the shaft 26 at a desired position.

This leaf spring 39 is also adapted to restrict the rotation of the shaft 26 when the pin 37 is separated from the control groove 38 via the rotation groove 38C.

An operating arm 27 is connected and fixed to one end (the right end in the figure) of the shaft 26 through a connecting hole 40, and the threading section 17 is attached to the tip 41 of the operating arm 27.

The tip 41 of the operating arm 27 is positioned so that the hook 19 of the threading section 17 can penetrate into the needle hole 7 at the top dead center of the needle 6.

Further, an operating lever 42 is provided at the tip 41 of the operating arm 27.

In addition, 43 in FIG. 1 is a presser foot lifter.

Next, the effect will be explained.

First, when threading is not required, as shown in FIGS. 3 and 5, the tip 41 of the operating arm 27 is positioned horizontally in the rear direction (direction of arrow C), and the operating arm 27 is moved in the left direction ( The support member 25 is moved in the direction of arrow A) and brought close to the support member 25.

In this state, there is no problem in operating the presser foot lifter 43, feeding the cloth, and other operations.

Further, in this case, the pin 37 of the shaft 26 is detached from the control groove 38 and faces upward at the left end of the shaft support portion 31, and rotation is restricted by the leaf spring 39, so that the operating arm 27
is reliably positioned.

Next, in order to thread the thread from this state, first grasp the operating lever 42 and move the operating arm 27 to the right (in the direction of arrow B).
(Figure 6).

In this case, since the pin 37 is not restricted in the left-right direction (direction of arrows A and B), the shaft 26 is in a slidable state, and when the operating arm 27 moves to the right end, the shaft 26 moves. The pin 37 is in the rotation groove 3.
It moves to a position corresponding to 8C and becomes in a state where it can engage with the rotation groove 38C.

Next, when the tip 41 of the operating arm 27 is rotated downward from this state, the pin 37 is rotated as the shaft 26 is rotated.
rotates, engages with the rotation groove 38C, and slides into the slide groove 38.
Rotation stops at the right end of a (Fig. 7).

In this case, rotation is restricted via the slide groove 38a,
The tip 41 is reliably positioned at the desired position.

Furthermore, from this state, move the operating arm 27 to the left (direction of arrow A).
When the shaft 26 is moved to , the shaft 26 slides until the pin 37 comes into contact with the left end of the slide groove 38a, at which point the operation arm 27 stops moving (FIG. 8).

In this state, the tip 41 of the operating arm 27 is regulated by the left end of the slide groove 38a, and positioned between the needle 6 and the presser bar 12 on the rear side of the needle 6.
The guide plate 21 of the threading section 17 provided in 1 comes into contact with the side surface of the needle 6 as shown in FIG. Match the position with the needle hole 7.

Note that the needle 6 is previously positioned at the top dead center.

In the case of a zigzag sewing machine, the needle 6 is slightly inclined at the top dead center, but it is corrected to a vertical position by the guide plate 21 and the hook 19
The needle hole 7 is aligned with respect to the needle hole 7.

Then, when the operating arm 27 is further pushed to the left (in the direction of arrow A) and the operating lever 42 is pulled forward (in the direction of arrow C), the pin 37 engages with the rotation groove 38 b. The tip 41 is inserted forward through the shaft 26 (arrow direction C).
direction), the hook 19 of the threading section 17 penetrates into the needle hole 7, and the tip 22 of the hook 19 projects forward from the needle hole 7 (FIG. 9).

In this case, as shown in FIG. 11, the guide plate 21 moves while contacting the side surface of the needle 6, and the bent portion 23 of the guide plate 20 serves as an introduction guide for the needle 6, so that the hook 19 is securely inserted into the needle hole 7.
penetrate into

As mentioned above, in the case of a zigzag sewing machine, the inclined state of the needle 6 at the top dead center is more reliably corrected to the vertical state by the action of the guide plate 20 in addition to the guide plate 21.

Furthermore, since the amount of movement of the threading section 17 is regulated by the rotation groove 38b, the needle 6 will not be damaged due to excessive movement.

In this state, when the thread 11 is passed to the lower sides of both guide plates 20 and 21, hooked onto the hook 24 of the guide plate 20, and the tip 41 of the operating arm 27 is moved backward, the hook 19
The tip 22 of the thread 11 leaves the needle hole 7 with the thread 11 hooked thereon, and the thread 11 is introduced into the needle hole 7 (FIG. 12).

At this time, the threading section 17 is located between the needle 6 and the presser bar 12, so move the operating arm 27 to the right (in the direction of arrow A) to move the threading section 17 between the needle 6 and the presser bar 12. It is only necessary to remove the thread 11 from the hook 19 by moving it to the outside of the hook 19, and threading work can be done easily and reliably.

Then, operate the operating arm 27 in the reverse order to the fifth one.
If you keep it in the state shown in the figure, it will not get in the way of your work and will be extremely convenient.

A sewing machine body in which a presser bar is located at the rear of the needle bar and a needle having a needle hole passing through the needle bar in the front-rear direction is movably supported through a support control means, and the threading section is movably supported. A threading device for a sewing machine that inserts a threading section between a presser bar and a needle and inserts a threading section into the needle hole from the rear to introduce thread into the needle hole, the support control means intervening between the needle bar and the needle. A support member is fixed to the sewing machine body between the rod and the support member, and is supported through the support member so as to be slidable and rotatable in the left and right directions, and is engaged with a control groove formed in the support member to control the slide position and rotation. It consists of an operating arm that is fixed to one end of a shaft whose movement position is regulated and that can freely intervene between the presser bar and the needle.The threading section is provided at the tip of the operating arm and can be inserted into and removed from the needle hole. With a hook that allows you to freely insert the thread into the needle hole,
Since the hook is comprised of a pair of guide plates for adjusting the needle position, one of which protrudes slightly from the other on both sides, it can be formed as an attachment, compared to conventional sewing machines that are separate from the main body. , Semi-automatic operation is possible, making threading work extremely easy and reliable.In addition, the threading part can be positioned between the presser foot and the needle, so the needle hole is located in the front and back direction, and the threading operation is extremely easy and reliable. Even with a zigzag sewing machine, where threading must be done in a narrow space between the presser foot and the presser foot, threading can be done easily and reliably.In addition, with a zigzag sewing machine, the needle is slightly inclined at top dead center. Since threading is performed while being corrected to a vertical position at the threading section, the difficulty of threading work in conventional zigzag sewing machines can be alleviated, and furthermore, the movement of the threading section can be supported and controlled. Since it is regulated by the means, the threading section can be positioned at an appropriate position, and the threading operation can be carried out more easily and reliably.

[Brief explanation of drawings]

Figure 1 is a perspective view showing how a conventional threading tool is used;
The figure is a perspective view showing another conventional threading device, Figure 3 is a side view of an embodiment of this invention, with the threading device installed in the sewing machine body, and Figure 4 is the same as the one shown in Figure 3. Figures 5 to 9 are perspective views showing the movement of the threading device, and Figures 10 to 12 show the connection between the threading unit and the needle. FIG. 3 is an enlarged plan view showing the relationship. In the diagram 2... Sewing machine body, 6... Needle,
7... Needle eye, 8... Arm of sewing machine body, 9... Needle bar, 11... Thread, 12...
... Presser bar, 16 ... Threading device, 17
... Threading section, 18 ... Support control means, 19 ... Hook, 20.21 ... Guide plate, 38 ... Control groove.

Claims (1)

[Claim for Utility Model Registration] A threading section is movable via a support control means for a sewing machine body in which a presser bar is located at the rear of the needle bar, and the needle bar is equipped with a needle through which the needle hole passes in the front and back direction. A threading device for a sewing machine in which the threading part is supported by the presser bar and the needle, the threading part is inserted between the presser bar and the needle, and the threading part is inserted into the needle hole from the rear to introduce the thread into the needle hole, The support control means includes a support member fixed to the sewing machine body between the needle bar and the presser bar, and a control groove formed in the support member that is slidably and rotatably passed through the support member in the left and right direction. The operating arm is fixed to one end of the shirt 1 and is capable of intervening between the presser bar and the needle. It consists of a hook provided at the tip that can penetrate into and out of the needle hole to introduce the thread into the needle hole, and a pair of guide plates on both sides of the hook, one of which protrudes slightly from the other, for adjusting the needle position. Characteristic sewing machine threading device.