JP2906747B2 - Sewing machine threading device - Google Patents

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 needle bar to which a plurality of sewing needles are attached, and more particularly to a threading device for a sewing machine which passes a thread through an eye of a sewing needle.

[0002]

2. Description of the Related Art In a sewing machine provided with a needle bar to which a plurality of sewing needles are attached, for example, a lock sewing machine, when a thread is passed through an eye hole of a sewing needle, it is performed manually by using tweezers or Japanese Utility Model Publication No. 53-35061. Or manually using a threading tool (attachment-like tool) shown in FIG.

[0003]

However, in the lock sewing machine, a device such as a looper and a cloth cutting knife is disposed near the front of the sewing needle. However, it often hindered the threading operation.

On the other hand, with regard to a sewing machine in which one sewing needle is attached to a needle bar, a threading hook is provided on the sewing machine body so as to be rotatable up and down, and the hook is connected to the eye hole of the sewing needle according to the rotation. A configuration is provided for invading the inside and retracting from the eye. In this configuration, when the threading hook is inserted into the eye of the sewing needle, the thread is hooked by the threading hook, and when the threading hook is retracted from the eye of the sewing needle, the thread is removed. It passes through the eye. In this case, since the threading can be performed only by rotating the threading hook, the operation is easier than that in the case of operating the tweezers or the attachment.

For this reason, a lock sewing machine having a plurality of sewing needles attached to a needle bar is provided with a threading device having a threading hook so that a threading operation can be easily performed. There is a strong demand among people.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a threading device for a sewing machine in which a plurality of sewing needles are mounted on a needle bar, which can easily perform a threading operation.

[0007]

Threading device of a sewing machine of the present invention According to an aspect of the looper height position of the eyelet is swung in synchronization with the needle bar and the needle bar that different needles are attached to each other In a threading device provided in a sewing machine having
Provided with a vertically movable provided the threading bar in a state of being arranged parallel to the needle bar, hydrofluoric the lower end of the threading bar
The eyelet of the needle by rotating horizontally the yarn through the axis of the rod is held via a click holding member as a rotation fulcrum
A hook for entering and retracting with respect to the hook, and the hook holding member is provided with the hook for threading obliquely.
A guide portion for slidably moving in the
Selectable hooks at multiple holding positions along the guide
And a holding means for holding the threader.
The hook is moved along the guide part and its holding position
Operating member for changing the position of the plurality of holding positions.
The threading hook held at the holding position
The height position and the turning radius are the heights of the respective eye holes of the plurality of sewing needles.
Position and the distance from the axis, respectively.
It has a feature where it is set .

[0008]

In a sewing machine in which a plurality of sewing needles are mounted on a needle bar, for example, a lock sewing machine, the height of the eye of each sewing needle is different because the height of the needle point of each sewing needle is different. For this reason, in order to rotate the threading hook to enter the eye of the sewing needle and to retract from the eye, the height of the rotation fulcrum of the threading hook is set to the height position of the eye of each sewing needle. It is necessary to select and match.

On the other hand, according to the present invention, a plurality of security
The holding position corresponds to the height position of each eye hole of multiple sewing needles respectively.
When performing threading, operate the operating member to
One of a along the hook guide portion slides of allowed <br/> an oblique direction, by Rukoto is held in any of the holding position, the height position of the threading hook plurality of needles and Can be selected .

In the above construction, the threading hook is rotated around the axis of the threading bar arranged in parallel with the needle bar, so that a plurality of sewing needles are arranged side by side in the left-right direction. In this case, it is necessary to change the turning radius of the threading hook in accordance with the position of the sewing needle in order to allow the threading hook to enter the eye of each sewing needle.

On the other hand, according to the present invention, a plurality of security
The holding position is the distance from the axis of each eye of the plurality of sewing needles, that is, the thread.
It corresponds to the turning radius of the threading hook.
By changing the holding position of the threading hook, the turning radius of the threading hook can be selected to correspond to one of the plurality of sewing needles. Therefore, the threading hook
The height position corresponds to the height position of the eye hole of one sewing needle, and
Radius of rotation corresponds to the distance from the axis of the eye
As a result, the threading hook securely enters the eye of the sewing needle.
And threading becomes possible. In this case, since the threading can be performed only by rotating the threading hook, the threading operation is greatly simplified as compared with the case of operating a tweezer or a threading tool. Then, slide the threading hook diagonally.
Simply change the holding position by moving the ride, and use it for threading.
Change both the hook height position and the turning radius at once.
Make the change operation extremely easy
Can be. In addition, the height of the threading hook was changed.
For changing the turning radius of the threading hook
The configuration is simpler than when the configuration is provided separately.
At the lower end of the threading rod.
These changes can be made by sliding the hook
It is possible, for example, to slide the entire threading rod
The space required for movement is very small compared to cases,
It is also advantageous in terms of space.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a two-needle type lock sewing machine will be described below with reference to the drawings. First, in FIGS. 1 and 2, the needle bar 1 is provided on the support portions 2 a and 2 b of the sewing machine main body 2 so as to be vertically movable. The sewing machine main body 2 includes a sewing machine bed unit and a sewing machine arm unit (not shown). A plurality of, in this case, for example, two sewing needles 4 and 5 are attached to the lower end of the needle bar 1 via a needle attachment portion 3.

The sewing needles 4 and 5 have different heights at the needle tips, and the sewing needle 5 on the left side is higher than the sewing needle 4 on the right side. In accordance with this, the position of the eye 5a of the sewing needle 5 is
Is higher than the position of the eye hole 4a. Needle bar 1
The needle bar holder 6 is fixed to an intermediate part of the needle bar holder 6, and a link mechanism 7 is connected to the needle bar holder 6. Needle bar 1
A driving force from a sewing machine motor (not shown) is transmitted via an upper shaft, a crank mechanism (both not shown), and the link mechanism 7 so as to be reciprocated vertically. A positioning stopper 8 is fixed below the needle bar holder 7 of the needle bar 1. A receiving portion 8a and a groove 8b are formed at the left end of the positioning stopper 8, as shown in FIG.

A mounting board 9 is fixed to the sewing machine main body 2 corresponding to an intermediate portion of the needle bar 1. This mounting board 9
As shown in FIG. 2, the upper support piece 9a
The lower support piece 9b is bent rearward, and the middle support piece 9c is formed rearward on the left side of the middle part. A through-hole is formed in each right portion of the upper support piece 9a and the lower support piece 9b, and the needle bar 1 is inserted into the through-hole.

A threading bar 10 is disposed on the left side of the needle bar 1 in parallel with the needle bar 1, and the threading bar 10 penetrates an intermediate support piece 9 c of the mounting board 9. It is inserted and supported in a hole and a through hole formed on the left side of the lower support piece 9b. Thereby, the threading bar 10 is configured to be able to move up and down while being arranged in parallel with the needle bar 1. A hook holding member 11 is attached to a lower end of the threading rod 10. A positioning pin 12 is fixed laterally to the upper end of the threading rod 10. This positioning pin 1
A coil spring 13 is provided between the left end of the sewing machine 2 and the support 2a of the sewing machine main body 2, and the threading rod 10 is urged upward by the coil spring 13.

The hook holding member 11 described above includes:
A threading hook 14 (see FIG. 5) is attached.
Hereinafter, this mounting structure will be described with reference to FIGS. In FIG. 5, the threading hook 14 is composed of a substrate portion 14a and a hook portion 14b protruding forward from a front end of the substrate portion 14a. Threading hook 14
Is held between two hook protection members 15 and 16. The hook protection members 15 and 16 are connected to the substrate portions 15a and 1
6a and hook protection portions 15b and 16b projecting forward from the front ends of the substrate portions 15a and 16a. The threading hook 14 and the hook protection members 15 and 16 are caulked on the right end side in FIG.
It is integrated by caulking the left end side.

Also, on the rear surface of the hook holding member 11,
A groove 11a as a guide is formed in an oblique direction.
The cover 18 is screwed with the threading hook 14 and the board portions 14a to 16a of the hook protection members 15 and 16 slidably housed in the groove 11a. Here, at the center of the groove 11a of the hook holding member 11,
An elongated hole 11b is formed, and the caulking pin 17 is inserted into the elongated hole 11b. This caulking pin 17
The threading hook 14 is moved into the groove 11a with respect to the hook holding member 11, that is, the threading rod 10.
It has become slidable in an oblique direction along the. Obedience
Therefore, the caulking pin 17 functions as an operation member.
Swelling. The hook holding member 11, the threading hook 14, the hook protection members 15, 16, the swaging pin 1
7, the cover 18 and the like constitute a selecting means 19.

The substrate 15a of the hook protection member 15
Moderation recesses 15c and 15d are formed in the middle portion of the cover, and the moderation ball 21 pressed by the leaf spring 20 passes through the through hole 18a formed in the cover 18 to form the recess 15c or the recess 15d. To be fitted. As a result, a holding means is formed, and the threading hook 14 is positioned at a position where the ball 21 is fitted into the concave portion 15c,
And two positions where the ball 21 is fitted in the recess 15d.
In one of the holding positions
ing.

When the threading rod 10 is rotated, the hook holding member 11 is pivoted about the axis of the threading rod 10.
Is rotated, that is, the threading hook 14 is rotated. The threading hook 14 enters the eye holes 4a, 5a of the sewing needles 4, 5 according to the rotation thereof, and the eye holes 4a, 5a.
It is configured to retreat from inside.

[0020] In this case, to change the holding position by causing sliding the threading hook 14 oblique direction
However, the change of the holding position
Of the threading hook 14 and the turning radius (axial center
(Horizontal distance from the camera) . The two holding positions correspond to the eye holes of the sewing needles 4 and 5, respectively.
4a, 5a and the horizontal distance from the axis
The position is set correspondingly. At the left end of the hook holding member 11, a knob 11c is provided to protrude leftward.

On the other hand, as shown in FIG. 1, a long hole 9d is formed in the left end portion of the mounting board 9 along the vertical direction. The pin 22 protruding toward is fitted slidably. At the lower left end of the mounting board 9, a rectangular notch 9e is formed continuously with the elongated hole 9d.

Next, the operation of the above configuration will be described with reference to FIGS.
The description will be made with reference to FIG. First, a case where threading is performed on the left sewing needle 5 among the sewing needles 4 and 5 will be described. In this case, the position of the needle bar 1 is set in advance so as to be located within a range of about 3 mm before and after the top dead center by rotating a pulley (not shown). If the needle bar 1 is located at this position, the upper looper, the lower looper, the knife (not shown) for cutting the cloth end and the like do not obstruct the threading operation.

In this state, first, the caulking pin 17 of the selecting means 19 is manually operated to move the threading hook 14 in FIG.
The ball 21 shown in FIG. 5 is slid obliquely upward to the middle left to fit into the moderation recess 15 c of the hook protection member 15. As a result, the threading hook 14 is held at the holding position corresponding to the height position and the turning radius corresponding to the sewing needle 5.
You . Specifically, the height of the threading hook 14 increases, and the turning radius decreases.

Thereafter, the knob 11 of the hook holding member 11
When the threading rod 10 is moved downward by operating the finger c, the positioning pin 12 of the threading rod 10 is moved to the receiving portion 8a of the positioning stopper 8 of the needle bar 1 as shown in FIGS.
(See FIG. 3), and the downward movement of the threading rod 10 is restricted. As shown by a two-dot chain line in FIG. 8, when the knob 11c of the hook holding member 11 is manually operated to rotate the threading rod 10 and the threading hook 14 to the front, the thread The hook portion 14 b of the threading hook 14 enters the eye 5 a of the sewing needle 5.

At this time, as shown in FIG. 6, a thread 23 guided from a thread top (not shown) is guided to a thread guide portion 11d of the hook holding member 11, and then tensioned toward the front side of the eye 5a of the sewing needle 5. Hand over and hook on hook portion 14b. Thereafter, when the threading hook 14 is rotated rearward, the hook portion 14b retreats from the eye 5a of the sewing needle 5 while hooking the thread 23. When retreating, the hook portion 14b passes the thread 23 into the eye 5a.

In this case, the threading hook 14 is connected to the eye 5a.
When the needle is rotated forward to enter and retract, the positioning pin 12 of the threading rod 10 is disposed in the groove 8b of the positioning stopper 8 of the needle bar 1 (see FIG. 3). The threading rod 10 does not move in the vertical direction. When the hook portion 20b of the threading hook 14 enters the eye 5a of the sewing needle 5, as shown in FIG.
The pin 22 of the threading rod 10 comes into contact with the left edge of the cutout 9e of the mounting board 9 as shown by a two-dot chain line. As a result, the rotation of the threading rod 10 is restricted. That is, the maximum rotation angle of the threading rod 11 is restricted, so that the threading hook 14 is prevented from colliding with the sewing needle 5 and being damaged.

When the threading hook 14 is rotated backward and returned to the rotation start position, the threading rod 10 is urged upward by the spring force of the coil spring 13 and is moved upward as shown in FIGS. Returns to the original state shown.

Subsequently, in order to pass the thread 23 through the eye hole 4a of the right sewing needle 4, as shown in FIG. 9, the caulking pin 17 of the selecting means 19 is operated by hand, and the threading hook 14 is moved. 9, the ball 21 shown in FIG. 5 is slid obliquely downward to the right to fit into the moderation recess 15 d of the hook protection member 15. Thereby, the threading hook 14 is held at the holding position corresponding to the height and the turning radius of the sewing needle 4.
You . Specifically, the height position of the threading hook 14 decreases, and the turning radius increases.

Thereafter, when the knob 11c of the hook holding member 11 is manually operated to move the threading rod 10 downward in the same manner as in the case of the sewing needle 5 described above, as shown in FIG. 12 is a receiving portion 8 of the positioning stopper 8
a, and the downward movement of the threading rod 10 is regulated. Then, as shown in FIG.
Of the threading hook 14
Is turned forward, the hook portion 14 b of the threading hook 14 enters the eye 4 a of the sewing needle 4. Thereby, the thread 23 can be passed through the eye 4a of the right sewing needle 4.

It should be noted that the threading hook 14 is
a, the threading rod 1 is inserted as shown in FIG.
The pin 22 of No. 0 abuts on the left edge of the notch 9e of the mounting board 9 as shown by the two-dot chain line, and the rotation of the threading hook 14 is regulated. It can be prevented from being damaged by colliding with.

According to the present embodiment having such a configuration, when performing threading, first, make the sliding movement <br/> the threading hook 14 by operating the caulking pin 17 of the selection means 19 in an oblique direction Thereby, the height position and the turning radius of the threading hook 14 are selected and corresponded to one of the plurality of sewing needles 4 and 5. Then, in this state, the threading hook 14 is
Is turned, the height position and the turning radius correspond to the selected sewing needles 4 and 5, so that the threading hook 14 enters the eye holes 4a and 5a of the selected sewing needles 4 and 5, and Through is possible. In this case, since the threading can be performed only by rotating the threading hook 14, the threading operation is greatly simplified as compared with a conventional configuration in which tweezers and a threading device are operated. Therefore, a plurality of sewing needles 4 and 5 are attached to the needle bar 1.
In the sewing machine, the thread passing through the plurality of sewing needles 4 and 5 is performed.
Work can be performed easily. At this time, for threading
Slide the hook 14 diagonally to adjust the holding position.
By simply changing the height, the height position and rotation of the threading hook
Since both changes in the dynamic radius can be made at once,
The change operation can be performed very easily. In addition,
Configuration and threading for changing the height of hook 14
Configuration for changing the turning radius of the hook 14
Configuration can be completed more easily than when
Moreover, a threading hook at the lower end of the threading rod 10
Since they can be changed by sliding 14 moves,
For example, when the entire threading rod 10 is slid.
The space required for movement is very small compared to
This is also advantageous.

Further, in the above embodiment, if the needle bar 1 is positioned within a range of about 3 mm before and after the top dead center, the positioning pin 12 of the threading rod 10 is
A position of the threading hook 14 with respect to the needle bar 1 can be determined. Therefore, since it is not necessary to accurately position the needle bar 1 at one point, the positioning of the needle bar 1 can be easily performed. By the way, in order to move the needle bar 1 within the range of about 3 mm before and after the above-mentioned top dead center, it is necessary to rotate the pulley by about 30 degrees in rotation angle.
The positioning operation can be performed very easily as compared with the case where the positioning is accurately performed at one point.

[0033]

According to the present invention, as apparent from the above description, the threading hook held by the hook holding member is inclined.
Slide position to change the holding position.
And the height position and turning radius of the threading hook to each sewing needle.
It was configured so that it can be changed to correspond
In, in a sewing machine for attaching a plurality of needles to the needle bar, each stitch
The threading work can be easily performed with respect to the needle, deer
Also, change the height position and turning radius of the threading hook.
Operation is easy and the configuration is simple.
The effect is excellent.

[Brief description of the drawings]

FIG. 1 is a front view of the vicinity of a threading device according to an embodiment of the present invention.

FIG. 2 is a side view around the threading device.

FIG. 3 is a perspective view of a positioning stopper.

FIG. 4 is a rear view around the threading hook.

FIG. 5 is an exploded perspective view around the threading hook.

FIG. 6 is a view corresponding to FIG. 1, showing a state in which the threading rod is moved downward.

FIG. 7 is a view corresponding to FIG. 2, showing a state in which the threading rod is moved downward.

FIG. 8 is a cross-sectional view around the threading hook.

FIG. 9 is a diagram corresponding to FIG. 7;

FIG. 10 is a diagram corresponding to FIG. 8;

[Explanation of symbols]

1 is a needle bar, 4 and 5 are sewing needles, 4a and 5a are eye holes, 8 is a positioning stopper, 9 is a mounting board, 10 is a threading rod, 11 is a hook holding member, 11c is a knob, 12 is a positioning pin, 14 is a threading hook, 19 is a selection means, and 23 is a thread.

Claims (1)

(57) [Claims] 1. A eyelet threading device provided in a sewing machine having a looper height position is swung in synchronization with the needle bar and the needle bar that is attached different needles each other, the needle A threading bar provided vertically movably in a state arranged in parallel with the bar, and a threading bar held at a lower end portion of the threading bar via a hook holding member;
It is rotated horizontally Re the axis of the yarn through rod as a pivot point
A threading hook which enters and retreats into the eye of the sewing needle, a guide portion provided on the hook holding member for guiding the threading hook slidably in an oblique direction, and the hook holding The threading hook provided on the member
Holding selectively at multiple holding positions along the guide
Means and the threading hook are moved along the guide portion to
And an operation member for changing the holding position of the
In said plurality of holding positions before held in their holding position
The height position and the turning radius of the threading hook
The height position of each eye hole of the sewing needle and the distance from the axis center respectively
A threading device for a sewing machine, wherein the threading device is positioned so as to correspond thereto .