JPH04224791A - Threading device of sewing machine with display means - Google Patents

Abstract

PURPOSE:To facilitate indication-matching and increase efficiency of threading work, by providing the second slide member to let thread pass into the hole of a sewing needle by swinging a hook and a display means illustrating the variable range of slide to enable to slide downward. CONSTITUTION:A selected member 22 is in the left side. The protruded part of a plate member 24 is fitted in the fitting hole of a selected member 22 so that the selected member 22 does not move. And a pulley is rotated to place the needle 1 to position within the range of around 3mm near the upper dead point. And the pointer 27 is forced to be within the graduation 28b of an indication finder 28a. If the needle 1 locates in this position, the upper louver, the lower louver, the knife for cutting the cloth edge, etc., do not hamper the threading work. In this condition, when manipulating the lever 14c of the second slide member 14 by fingers to move downward the second slide member 14, both first and second slide members 10, 14, are transferred together.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a threading device for threading a thread through an eye of a sewing machine in a sewing machine equipped with a needle bar to which a sewing needle is attached, and particularly to a sliding range that allows the slide member to slide. The present invention relates to a sewing machine threading device equipped with a display means for displaying.

0002

2. Description of the Related Art Conventionally, as a threading device for a sewing machine equipped with a looper, there is, for example, a sewing machine disclosed in Japanese Patent Application Laid-Open No. 2-104391.

According to this publication, the timing disk 20
The notch 20a provided at the tip 17 of the timing arm 17
When the hook is in the position where it engages with the needle a, by rotating the shaft 12, the hook enters the eye of the sewing needle and threading is performed.

On the other hand, at other timings, the tip 17
a came into contact with the outer periphery of the timing disk 20 other than the notch 20a, and the shaft 12 could not be rotated any further.

[0005]

However, according to the above publication, the notch 20a of the timing disk 20 and the tip 17a of the timing arm 17 cannot be aligned even if there is a slight deviation on the circumference, making it difficult to align the display. Precision was required.

The present invention has been made in order to solve the above-mentioned problems, and includes display means for displaying a slidable range in which the sliding member can slide, and by making it easier to adjust the display, it is possible to The purpose is to improve the efficiency of threading work.

[0007]

[Means for Solving the Problems] A threading device for a sewing machine equipped with a display means of the present invention includes a needle bar that is movable up and down and to which a sewing needle is attached, and a needle bar that is arranged parallel to the needle bar and that slides up and down. a first slide member that is movably provided and has an abutting portion; and a first slide member that is swingably provided to the first slide member so that the sewing needle enters into the eye hole of the sewing needle in response to the rocking movement; a threading hook that is retracted from the needle bar; a positioning convex portion provided on the needle bar and abutted by the abutment portion when the first slide member slides downward;
It is provided so that it can be slid up and down integrally with the slide member of
a second slide member that swings the hook and enters the eye of the sewing needle by sliding the contact portion further downward after the contact portion contacts the positioning convex portion; The structure includes a display means for displaying a slidable range that allows the member to slide downward.

[0008]

[Operation] According to the threading device of the sewing machine of the present invention, when threading the thread, first slide the first slide member provided with the hook downward, and then the abutment provided on the first slide member The position of the first slide member, that is, the position of the hook is determined with respect to the needle bar by the contact of the first slide member with the positioning convex portion of the needle bar. When the second slide member is further slid downward in this state, the hook swings and enters the eye of the sewing needle, allowing threading.

[0009] When performing this work, the operator can perform threading while checking the slideable range of the second slide member in advance on the display means.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a lock sewing machine will be described below with reference to FIGS. 1 to 12.

First, in FIGS. 1 and 2, a needle bar 1 is provided on support portions 2a and 2b of a sewing machine main body 2 so as to be movable up and down. The sewing machine main body 2 includes a bed portion and an arm portion (not shown). A plurality of sewing needles 4 and 5, in this case two, are attached to the lower end of the needle bar 1 via needle attachment portions 3. Sewing needles 4 and 5 have different needle tip heights,
The sewing needle 4 on the left side is higher than the sewing needle 5 on the right side. Accordingly, the position of the eye hole 4a of the sewing needle 4 is higher than the position of the eye hole 5a of the sewing needle 5. Further, a needle bar holder 6 is fixed to an intermediate portion of the needle bar 1, and a link mechanism 7 is connected to this needle bar holder 6. The needle bar 1 is reciprocated in the vertical direction by transmitting driving force from a sewing machine motor (not shown) through an upper shaft, a crank mechanism (none of which is shown), and the link mechanism 7. There is. On the right side of the needle attachment part 3 of the needle bar 1, there is a
A positioning convex portion 8 is provided to protrude toward the right. The positioning convex portion 8 has a stepped shape, with large diameter portions 8 on the left and right.
a and a small diameter portion 8b.

At the rear of the needle bar 1, a presser bar 9 is provided on support portions 2a and 2b so as to be parallel to the needle bar 1. A cloth presser (not shown) is attached to the lower end of this presser bar 9. A first slide member 10 is provided on the presser bar 9 so as to be slidable in the vertical direction. The first slide member 10 has a substantially U-shape as a whole, and includes a base plate portion 10a, an upper bent portion 10b, and a lower bent portion 10c. The presser rod 9 is inserted into through holes formed in the upper bent portion 10b and the lower bent portion 10c, respectively. A mounting portion 10d bent downward at a right angle is formed at the tip of the lower bent portion 10c. Upper bent part 10b
As shown in FIG. 2, the rear part of the
The first slide member 10 is prevented from rotating by engaging this projecting piece 10e with a presser bar holder 11 fixed to the presser bar 9. On the left side of the base plate 10a of the first slide member 10, a pin 12 is protruded from the upper part and a pin 13 is protruded from the lower part.

On the other hand, the second slide member 14
It is provided so that it can be slid up and down integrally with the slide member 10 of. The second slide member 14 has a substantially L-shape as a whole, and long holes 14b and 14c are formed in the upper and lower portions of the left surface of the base plate portion 14a. The first slide member 1 is inserted into the long holes 14b and 14c.
0 pins 12 and 13 are fitted and prevented from coming off. A spring hanging portion 14 is provided at the lower part of the left side of the board portion 14a.
d is provided, and this spring hanging portion 14d and the pin 12
A coil spring 15 is provided between the two. The coil spring 15 allows the first slide member 10 and the second slide member 14 to slide together.

Further, a coil spring 16 is provided between the spring hanging portion 14d of the second slide member 14 and the support portion 2a. This coil spring 16 urges the second slide member 14 upward. A knob portion 14e is provided on the upper portion of the base plate portion 14a of the second slide member 14 so as to protrude leftward. Knob portion 1 in substrate portion 14a
A projecting piece 14f is provided below 4e to protrude forward. A bent portion 14g, which is bent at right angles to the lower end of the base plate portion 14a, protrudes toward the right. A thread guide section 14h is provided at the left end of the bent section 14g to protrude downward.

Now, on the right side of the mounting portion 10d of the first slide member 10, a shaft 17 is provided to protrude rightward. A lever 18 is rotatably supported on this shaft 17, and as shown in FIG. 11, a hook 19 for threading is provided at the tip of the lever 18. The hook 19 opens the eye holes 4a and 5 of the sewing needles 4 and 5 in accordance with the rotation of the lever 18.
It is adapted to enter into the inside of the eye hole 4a and retreat from the inside of the eye hole 4a, 5a. Guide plates 20 and 21 are provided on both sides of the hook 19.
is provided. As shown in FIG. 11, a cam portion 18a is formed on the base end side of the lever 18, with which the right end portion of the bent portion 14g of the second slide member 14 comes into contact.

Further, as shown in FIG. 7, a selection member 22 is provided on the shaft 17 so as to be movable in the left-right direction. The selection member 22 has a substantially U-shape, and has a substrate portion 22a.
, a right end plate portion 22b and a left end plate portion 22c. The shaft 17 is inserted through through holes formed in the right end plate portion 22b and the left end plate portion 22c, respectively. As shown in FIG. 2, a contact portion 22d that contacts the positioning convex portion 8 is provided at the front portion of the left end plate portion 22c to protrude forward. An operating section 22e is provided at the front of the base plate section 22a to protrude forward. As shown in FIG. 1, a torsion coil spring 23 is inserted into the shaft 17 and is provided between the lever 18 and the selection member 22. The torsion coil spring 23 biases the lever 18 in the clockwise direction in FIG. 2, and allows the lever 18 and the selection member 22 to move together in the left-right direction.

As shown in FIG. 7, a plate member 24 is provided at the lower bent portion 10c of the first slide member 10 so as to protrude toward the selection member 22. A convex portion 24a is provided on the lower surface of the right end. on the other hand,
The substrate portion 22a of the selection member 22 has two fitting holes 22f and 22g formed on the left and right sides. In this case, when the selection member 22 moves to the right, the protrusion 24a fits into the fitting hole 22f, and when the selection member 22 moves to the left, the protrusion 24a
is adapted to fit into the fitting hole 22g. Further, as shown in FIGS. 2 and 8, a slide regulating lever 25 is provided at the front end of the support portion 2b so as to be rotatable in the left-right direction using its lower end as a fulcrum. Slide regulation lever 2
A coil spring 26 is provided between the upper end of the support portion 5 and the support portion 2a. This coil spring 26 biases the slide regulating lever 25 in the clockwise direction in FIG. The slide regulating lever 25 has a cam groove 25a having the shape shown in the figure.
is formed, and the projecting piece 14f of the second slide member 14 fits into this cam groove 25a. As shown in FIG. 9, the slide regulating lever 25 is
When the projecting piece 14f moves downward, it rotates clockwise. However, when the needle bar 1 has moved to the position shown by the two-dot chain line in FIG. 8, that is, the position where threading is impossible, the needle bar 1 Needle bar holder 6
It comes in contact with and cannot be rotated any further.

On the other hand, as shown in FIG. 10, a pointer 27 is attached to the front surface of the needle bar holder 6 of the needle bar 1 so as to protrude leftward. The case 28 constituting the arm portion is provided with a display window portion 28a corresponding to the pointer 27. The user can read the pointer 2 through this display window 28a.
7 can be visually recognized. A scale 28b is provided at the upper left edge of the display window 28a to indicate a range in which threading is possible.

Next, the operation of the above structure will be explained with reference to FIGS. 3 to 6. First, the case where the left sewing needle 4 of the sewing needles 4 and 5 is threaded will be described. In this case, the selection member 22 is first moved to the left (see FIG. 1). In this case, the convex portion 24a of the plate member 24 is connected to the selection member 22.
The selection member 22 is fitted into the fitting hole 22g to prevent the selection member 22 from moving. Then, by rotating a pulley (not shown), the position of the needle bar 1 is set within a range of approximately 3 mm before and after the top dead center. In this case, as shown in FIG. 10, the pointer 27 is positioned within the scale 28b of the display window 28a. If the needle bar 1 is located in this position, the upper looper, lower looper, knife for cutting the fabric edge (none of which are shown), etc. will not interfere with the threading operation. In this state, the knob 14 of the second slide member 14
When the second slide member 14 is moved downward by operating e with a finger, the first and second slide members 10 and 1
4 move together. As shown in FIGS. 3 and 4, when the contact portion 22d of the selection member 22 contacts the large diameter portion 8a of the positioning convex portion 8, the downward movement of the first slide member 10 is restricted. . After this, the second slide member 1
4 further downward, the first slide member 10
remains stopped, and only the second slide member 14 moves downward. By this movement of the second slide member 14,
The bent portion 14g of the second slide member 14 contacts the cam portion 18a of the lever 18 and presses it downward. This causes the lever 18 to rotate counterclockwise, as shown in FIGS. 5 and 6. Then, the hook 19 at the tip of the lever 18 enters the eye hole 4a of the sewing needle 4. In this state, the thread 29 guided from a thread spool (not shown) is guided to the thread guide section 14h of the second slide member 14, and then the guide plate 20
, 21 and hooked onto the hook portion 19a of the hook 19 (see FIGS. 5 and 12). After this, the knob 14e of the second slide member 14
When you release your finger, the spring force of the coil spring 16 causes the second
The slide member 14 of is moved upward. As a result, the lever 18 rotates clockwise in FIG. 6 due to the spring force of the torsion coil spring 23, and the hook 19 retreats from the eye hole 4a of the sewing needle 4 while catching the thread 29. During this retreat, the hook 19 passes the thread 29 into the eye hole 4a, and the spring force of the coil springs 15 and 16 moves the first and second slide members 10 and 14 upward, as shown in FIG.
and returns to the original state shown in FIG.

Next, in order to pass the thread through the eyelet 5a of the right sewing needle 5, operate the operating section 22e of the selection member 22 to move the selection member 22 to the right, as shown in FIG. , the convex portion 24a of the plate member 24 is fitted into the fitting hole 22f of the selection member 22. After setting the position of the needle bar 1 to be within a range of approximately 3 mm before and after the top dead center, the second slide member 14 is moved downward in the same manner as in the case of the left sewing needle 4 described above. Then, the contact portion 22d of the selection member 22 comes into contact with the small diameter portion 8b of the positioning convex portion 8, and the downward movement of the first slide member 10 is restricted. After that, when the second slide member 14 is moved further downward, the lever 1
8 rotates, and the hook 19 enters into the eye hole 5a of the right sewing needle 5. This allows the thread to be passed through the eye hole 5a of the right sewing needle 5. In this case, the contact portion 2 of the selection member 22
2d comes into contact with the small diameter portion 8b of the positioning convex portion 8, so that the pivot point of the lever 18 is aligned with the position where the hook 19 can enter into the eye hole 5a of the right sewing needle 5. There is.

According to this embodiment having such a configuration, the first
Since threading can be carried out simply by sliding the second slide members 10 and 14, threading errors are avoided and workability can be improved compared to the conventional method of operating tweezers or threading tools. In addition, if the needle bar 1 is positioned within a set range of about 3 mm before and after the top dead center, the selection member 2 of the first slide member 10
2 comes into contact with the positioning convex portion 8 of the needle bar 1, whereby the position of the hook 19 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 needle bar 1 can be aligned more easily than in the conventional configuration. By the way, in order to move the needle bar 1 within a range of approximately 3 mm before and after the above-mentioned top dead center, it is necessary to turn the pulley approximately 30 degrees, so compared to the case where the needle bar 1 is precisely positioned at one point, it is necessary to turn the pulley approximately 30 degrees. This greatly simplifies the alignment work.

Further, when the needle bar 1 is in a position where threading cannot be performed (as shown by the double-dashed line in FIG. Can't rotate. As a result, even if the protruding piece 14f of the second slide member 14 tries to move downward, the protruding piece 14f hits the stepped part 25b of the cam groove 25a of the slide regulating lever 25, and the protruding piece 14f moves downward. Movement will be regulated. As a result, the downward movement of the second slide member 14 is restricted, so the hook 19 cannot be rotated and threading cannot be performed. Thereby, it is possible to reliably prevent the hook 19 from colliding with the looper or the like and being damaged.

Furthermore, in the above embodiment, when aligning the needle bar 1, as shown in FIG.
8a, just rotate the pulley so that the pointer 27 of the needle bar 1 is positioned within the range of the scale 28b.
Positioning work becomes easier.

Further, the amount of displacement in the vertical direction at the rest point of the vertical reciprocating movement of the needle bar 1, ie, the highest point or the lowest point, is extremely small. Therefore, when display alignment is performed at the rest point, there is an effect that alignment is easier because the unbuffered range is wider than that of the timing disc type notch described in the prior art section.

FIGS. 13 and 14 show modified examples,
Differences from the above embodiment will be explained. 13 and 14, one sewing needle 31 is attached to the lower end portion of the needle bar 1 via a needle attaching portion 30. As shown in FIG. Needle attachment part 3
0, a positioning protrusion 32 is provided protrudingly. This positioning convex portion 32 is not provided with a stepped portion. and,
A contact portion 33 that contacts the positioning convex portion 32 is provided on the attachment portion 10d of the first slide member 10. Further, the lever 18 to which the hook 19 is attached is only rotatably provided on the shaft 17 of the first slide member 10, and is not movable in the left-right direction. That is, no configuration such as a selection member is provided. The lever 18 is
It is biased clockwise in FIG. 14 by a torsion coil spring 34.

According to the above modification, when the second slide member 14 is moved downward, the contact portion 33 of the first slide member 10 contacts the positioning convex portion 32, and the first slide member 14 is moved downward. The downward movement of the member 10 is restricted. Thereafter, the second slide member 14 moves further downward, thereby rotating the lever 18. As a result, lever 1
The hook 19 of No. 8 enters into the eye hole 31a of the sewing needle 31. This allows threading.

[0027]

As described in detail above, according to the present invention, the contact portion provided on the first slide member contacts the positioning convex portion of the needle bar. The position of the slide member, that is, the position of the hook is determined. When the second slide member is further slid downward in this state, the hook swings and enters the eye of the sewing needle to thread the needle.

When performing this work, the operator can thread the thread while checking the slideable range of the second slide member on the display means in advance, and the display is easy to adjust, so the operator can thread the thread efficiently. This has the effect of being able to thread the thread reliably.

[Brief explanation of the drawing]

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

FIG. 2 is a side view of the same.

FIG. 3 is a front view showing different states around the threading device.

FIG. 4 is a side view of the same.

FIG. 5 is a front view showing a state in which the hook has entered the eye hole of the sewing needle.

FIG. 6 is a side view of the same.

FIG. 7 is an enlarged longitudinal sectional front view of the main part.

FIG. 8 is a front view of the vicinity of the slide regulating member.

FIG. 9 is a front view showing the same different state.

FIG. 10 is a front view showing a display window and a pointer.

FIG. 11 is a side view showing the hook, lever, etc.

FIG. 12 is an enlarged perspective view of the hook.

FIG. 13 is a front view of the vicinity of the threading device showing a modified example.

FIG. 14 is a side view of the same.

[Explanation of symbols]

1 Needle bar 2　Sewing machine body 4 Sewing needle 4a Eye hole 5 Sewing needle 5a Eye hole 8 Positioning protrusion 10 First slide member 14 Second slide member 18 Lever 19 Hook 22 Selected parts 25 Slide regulation lever 27 Guidelines 28a Display window section 29 Thread 31 Sewing needle 32 Positioning protrusion

Claims (1)

[Claims] 1. A needle bar that is movable up and down and to which a sewing needle is attached; a first slide member that is disposed parallel to the needle bar and that is slidable up and down, and that includes an abutting portion; a threading hook that is swingably provided on the first slide member and moves into and out of the eye of the sewing needle in response to the swing; a positioning convex portion with which the abutting portion abuts when the slide member slides downward; and a positioning convex portion that is provided so as to be slidable up and down integrally with the first slide member, and the abutting portion abuts the positioning convex portion. A second slide member that is slid further downward after contacting the hook to swing the hook and enter the eye of the sewing needle, and allows the second slide member to slide downward. A threading device for a sewing machine comprising a display means for displaying a slideable range.