JPS6022937Y2 - Threading device in zigzag sewing machine - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a threading device for passing thread through the needle of a zigzag sewing machine.

PRIOR ART In general, in a zigzag sewing machine equipped with a horizontal hook that rotates in a plane parallel to the sewing work surface and also equipped with a threading device, as shown in FIG. The needle bar 2 is swung around the vertical axis O with the eyelet 1a of the needle bar 2 always facing forward.

Further, a threading rod 6, which has a pair of guide pieces 3 and 4 and a threading hook 5 at its lower end and is rotatable around its own axis, is attached to the threading rod 6, which rotates around the pivot axis O of the needle 1. The needle bar 2 is oscillated with the same swing width as the needle bar 2, and is also moved up and down relative to the needle bar 2.

When inserting the thread into the eyelet 1a of the needle 1,
is positioned upward and the hook 5 and the eyelet 1a of the needle 1 are arranged on the same plane, and the threading rod 6 is rotated to insert the eyelet 1a from behind the eyelet 1a of the needle 1. The hook 5 enters into the thread 1a, and after the hook 5 hooks and holds the thread, the threading rod 6 is rotated back.

Further, as shown by the solid line in FIG. 1, the hook 5 was designed to enter the center of the eye hole 1a when the needle 1 was placed at the center of the left and right swing width.

However, in this conventional threading device, the first
As shown by the chain line in the figure, when the hook 5 is inserted into the eye hole 1a with the needle 1 stopped at the left and right swinging position, the eye hole 1a of the needle 1 always faces forward. 1 is swung, the angle of entry of the hook 5 into the eye hole 1a of the needle 1 changes, which not only may make it impossible to thread the thread reliably, but also cause the hook 5 to collide with the needle 1. There was a risk that both 5 and 1 would be damaged.

Purpose This invention was made to eliminate the above-mentioned defects.The purpose of this invention is to adjust the thread relative to the needle bar so that the relative positional relationship between the needle eye and the threading hook is maintained constant. A threading device for a new zigzag sewing machine that can reliably thread the thread without damaging the needle or hook even if the needle is stopped at any swinging position by regulating the position of the threading rod. It is about providing.

EXAMPLE An example embodying this invention will be described below with reference to FIGS. 2 to 6.

As shown in FIGS. 3 and 4, a vertically extending support shaft 12 is disposed within the arm 11a of the sewing machine frame 11, and a needle bar support frame 13 is rotatably inserted and supported by the support shaft 12. ing.

A pair of stepped metals 14 are inserted and fixed into both the upper and lower bent portions 13a13b of the needle bar support frame 13, and a needle bar 16 having a lower end needle 15 is inserted through the metals 14 so as to be movable up and down.

A needle bar holder 17 is fixed approximately in the center of this needle bar 16.
As the main shaft rotates, the needle bar 16 is moved up and down via a needle bar crank (not shown) and this needle bar holder 17.

On the other hand, as shown in FIGS. 3 and 4, the upper bent portion 13a
A connecting portion 18 is bent and formed on the needle bar support frame 13 adjacent to the needle bar support frame 13, and a shaft 18a inserted through and fixed to the connecting portion 18 has a fixed swing width around the support shaft 12. A zigzag rod 19 for laterally swinging the needle bar 16 is connected thereto.

A threading bar support frame 20 is attached to the double-stepped metal 14 on the needle bar support frame 13 at its upper and lower bent portions 20a.

It is rotatably supported around the needle bar 16 at 20b.

A projecting piece 22 having a locking step 22a is bent on one side edge of the threading rod support frame 20, and a guide groove 23 extending vertically is formed in the lower half of the support frame 20. .

Both upper and lower bent portions 20a of the threading rod support frame 20.

A threading rod 24 extending parallel to the needle bar 16 is supported on 20b so as to be rotatable about its own axis and movable up and down relative to the needle bar 16.

As shown in FIGS. 2 and 6, the barrel 25 fixed to the lower end of the threading rod 24 has a pair of guide pieces 26.27 and a threading hook 28 located between the two guide pieces 26.27. Fixed.

An operating pin 29 is installed near the upper end of the threading rod 24 and extends in the horizontal direction.

An operating member 30 is inserted into the threading rod 24 at an upper bent portion 30a between the threading rod 24 and the threading rod support frame 20, and a pin 31 protruding from the lower end of the threading rod 24 is inserted into the threading rod 24 between the threading rod 24 and the threading rod support frame 20. It is inserted into the guide groove 23 of the rod support frame 20.

A tension spring 33 is hung between the pin 31 and a spring hook 32 fixed to the arm lla of the sewing machine frame 11, and the actuating member 30 is urged to move upward based on the spring force. .

Further, an extending arm 34 extending upward is formed on the operating member 30, and an engaging groove 34a opening at the front is formed at the upper end of the extending arm 34.
is formed.

An inclined slot 35 is formed on the side surface of the actuating member 30, and one end of the actuating pin 29 is fitted into the slot 35.

Further, a compression spring 3 is attached to the threading rod 24 between the operating pin 29 and the upper bent portion 30a of the operating member 30.
6 is wound, and one end of the actuating pin 29 is normally engaged with the lower end of the inclined slot 35 due to its spring force.

On the other hand, below the needle bar holder 17, a regulating body 37 is fixed to the needle bar 16 at its base end 37a.
A bifurcated portion 38 that opens to the side to hold the threading rod 24, and a slot 39 that opens to the side and front and rear so that the other end of the operating pin 29 can be fitted therein are formed.

Then, as shown in FIG. 6, the eye hole 1 of the lower end needle 15 is
When the needle bar 16 is swung in the horizontal direction with the needle 5a always facing forward, the threading bar support frame 20 rotates relative to the needle bar 16, as shown in FIGS. be done.

Further, the bifurcated portion 38 of the regulating body 37 is always open to the side, the threading rod 24 is held between the bifurcated portion 38, and the position of the threading rod 24 with respect to the needle bar 16 is regulated. 38 and the threading rod 24 via the threading rod support frame 20.
is moved laterally integrally with the needle bar 16.

That is, when the needle bar 16 swings, the regulating body 3
7, the relative positional relationship between the eye hole 15a of the needle 15 and the threading hook 28 is always kept constant.

A support shaft 41 extending vertically is provided on the inner surface of a face plate 40 fixed to the side surface of the arm lla.

An operating member 42 is inserted through the support shaft 41 so as to be movable up and down, and is biased to move upward by a compression spring 41a wound around the support shaft 41.

At the tip of the upper bent portion 42a of the operating member 42, a retaining piece 43 that can be engaged and detached from the engagement groove 34a of the extending arm 34 on the operating member 30 is provided in a protruding manner.

Then, as shown in FIG. 2, the operating member 42 is placed in the upper position based on the spring force of the compression spring 41a, and the engaging piece 43 is engaged with the engaging groove 34a of the operating member 30. It has become.

Further, an operating knob 44 that projects outward through a groove 40a of the face plate 40 is attached to the operating member 42.

Next, the operation of the threading device configured as described above will be explained.

Now, FIGS. 2 to 4 show a state in which the sewing machine is stopped with the needle 15 disposed at the center of the horizontal stitch width and in the uppermost position.

In this state, the actuating member 30 is urged upward by the action of the tension spring 33, and its pin 31 engages with the upper end of the guide groove 23 of the threading rod support frame 20, thereby holding it at the highest position.

Further, the threading rod support frame 20 is held at the highest position with one end of the actuating pin 29 engaged with the lower end of the inclined slot 35 of the actuating member 30 by the action of the compression spring 36.

Furthermore, this actuating pin 29 is arranged above the bifurcated portion 38 of the regulating body 37.

When inserting the thread into the eye hole 15a of the needle 15,
First, the operation knob 44 resists the spring force of the compression spring 41a.
When the operating member 42 is pressed down via the engaging piece 43
Based on the engagement with the engagement groove 34a of the actuating member 30, the actuating member 30 and the threading rod 2 are moved against the spring force of the tension spring 33.
4 are lowered together.

As the threading rod 24 descends, when the other end of the operating pin 29 is engaged with the upper surface of the bifurcated portion 38 of the regulating body 37, the threading hook 28 is held at the same height as the eye hole 15a of the needle 15. Positioned.

Thereafter, when the actuating member 30 is further pushed down, the threading rod 24 along with the actuating pin 29 along the inclined slot 35
is rotated clockwise in FIG. 4, and its operating pin 29 is fitted into the slot 39 of the regulating body 37.

As the threading rod 24 rotates, the threading hook 28 is rotated clockwise in FIG. 6, as shown by the solid line in FIG. Enter from the center.

When one end of the operating pin 29 engages with the upper end of the inclined slot 35, the threading rod 24 rotates and the operating member 3
0 is prevented from falling.

In this state, thread the upper thread into the threading hook 2 using an appropriate method.
8 and then release the push-down operation of the operating knob 44. Since the operating pin 29 is fitted into the slot 39 of the regulating body 37, first, only the operating member 30 is released from the spring of the tension spring 33. Raised based on power.

Then, as the operating member 30 rises, the threading rod 24 is rotated back along the inclined slot 35 together with the operating pin 29, and one end of the operating pin 29 is inserted into the inclined slot 35.
At the same time, the other end of the operating pin 29 is removed from the retaining groove 34a.

After that, the operating member 30, the threading rod 24 and the operating member 42
is restored and raised pairwise.

Further, as the threading rod 24 returns and rotates, the threading hook 28 is rotated counterclockwise in FIG. 6, and the hook 28 escapes from the eye hole 15a of the needle 15 while holding the upper thread. do.

Therefore, the upper thread is reliably inserted into the eye hole 15a of the needle 15.

On the other hand, with the eye hole 15a of the needle 15 always facing forward,
The support shaft 12
When the needle bar 16 is laterally swung around the center, the regulating body 37 and the threading bar support frame 20
The actuating member 30 and the threading rod 24 are integrally moved in the lateral direction, and the relative positional relationship between the eye hole 15a of the needle 15 and the threading hook 28 is always kept constant by the regulating body 37.

Therefore, as shown by the chain line in FIG. 6, when performing the threading operation with the needle 15 placed at the left and right swing positions, the needle 15 is placed at the center position of its swing width. As in the above case, the angle at which the threading hook 28 enters the eyelet 15a of the needle 15 does not change, and the hook 28 reliably enters the center of the eyelet 15a of the needle 15, thereby ensuring the threading operation. It can be carried out.

In this embodiment, when the needle bar 16 is lowered and the regulating body 37 is disposed below the protrusion 22 of the threading rod support frame 20, the operating knob 44 is pressed down and the operating member 3
When the threading rod 24 is lowered with 0, the 2nd and 5th
As is clear from the figure, one end of the operating pin 29 contacts the protrusion 22 before the operating pin 29 contacts the upper surface of the bifurcated portion 38 of the regulating body 37, so that the lowering of the threading rod 24 is prevented. At the same time, rotation of the threading rod 24 is prevented by the locking stepped portion 22a of the projection piece 22.

Therefore, even if the operating knob 44 is pressed down by mistake while the needle bar 16 is lowered, the threading hook 28 will not be rotated.

Effects As detailed above, this invention regulates the position of the threading bar relative to the needle bar so that the relative positional relationship between the needle index and the threading hook is maintained constant. This provides an excellent effect in that threading work can be reliably performed without damaging the needle and the hook no matter what swing position the needle is stopped at.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example, and is a plan sectional view showing the operating state of the threading device. Figures 2 to 6 show an embodiment of this invention, in which Figure 2 is a front sectional view showing the main parts of a zigzag sewing machine, Figure 3 is a side sectional view, and Figure 4 is an enlarged plan view. A sectional view, FIG. 5 is a view corresponding to FIG. 4 showing the needle stopped at the left swinging position,
FIG. 6 is an explanatory diagram of the operation of the threading device. Needle bar support frame 13, needle 15, eye hole 15a, needle bar 16, threading bar stand frame 20, threading bar 24, threading hook 28, regulating body 37, base end 37a, bifurcated part 38°

Claims (1)

[Claims for Utility Model Registration] 1- A needle bar 16 that is supported by a needle bar support frame 13 that is swingable around a vertical axis and has a needle 15 at its lower end, extends parallel to the needle bar 16, and has a threading hook 28 at its lower end. Fixed threading rod 2
4 and a threading bar frame 20 that supports the threading bar 24 so that the threading bar 24 can rotate about its own axis and move up and down relative to the needle bar 16. In the zigzag sewing machine equipped with a threading device, the threading bar stand frame 20 is arranged to be swingable about the axis of the needle bar 16, and the threading bar stand frame 20 is arranged to be swingable about the axis of the needle bar 16, and Adjust the position of the threading rod 24 to the needle 15.
A regulating body 37 for regulating the relative positional relationship between the eye hole 15a and the threading hook 28 to be kept constant.
is fixed to a needle bar 16. 2. The threading device according to claim 1, wherein the regulating body 37 has a proximal end portion 37a fixed to the needle bar 16 and a bifurcated portion 38 that engages with the threading rod 24. .