JP2592494Y2 - Sewing machine needle hole 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 needle hole device of a sewing machine for setting a thread loop formed by penetrating an upper thread through a fabric by a sewing needle of a sewing machine at a position where a blade point of a rotary hook catches the thread. is there.

[0002]

2. Description of the Related Art FIG. 6 is a view showing a needle hole device A of a sewing machine. The needle hole device A of the sewing machine includes a needle guide member A1 having a circular needle through hole B, and a needle guide member A1. And a needle plate A2 for detachably supporting the sewing machine W. The needle plate A2 is provided between the sewing object W and a rotary hook 3 described later. The needle hole device A of the sewing machine has a needle through hole B corresponding to the thickness of the sewing needle N when the sewing needle N is exchanged according to various sewing objects W. The needle guide member A1 is installed on the needle plate A2 such that the center position of the needle through hole B coincides with the elevation path N1 of the sewing needle N.

[0003] Further, N is a sewing needle which is moved up and down by a lifting means (not shown). The sewing needle N has a needle hole Na near a tip end thereof. )
Is inserted. Reference numeral 3 denotes a rotary hook (a vertical full rotary hook, a horizontal full rotary hook, a half rotary hook, or the like, and the illustrated example shows a vertical full rotary hook). ) And an outer hook 3a having a sword 5 and rotated by rotating means (not shown).
And, it has.

Next, the operation of the needle hole device shown in FIG. 6 will be described with reference to FIGS. As shown in FIG. 7, the sewing needle N penetrates the workpiece W and passes through the needle through hole B of the needle hole device A of the sewing machine.
Through the needle plate A2, and then rises as shown in FIG. 8 to deflect the sewing thread 1 below the sewing object W and the needle plate A2, thereby forming loops 1a on both sides of the needle hole Na. Form. Then, the rotary hook 3 captures the thread loop 1a formed by the sewing needle N with the blade point 5 of the outer hook 3a, and captures the sewing thread (bottom thread) of the bobbin stored in the inner hook 3b with the thread loop 1a.
(Upper thread) to form a seam.

By the way, the rotary hook 3 approaches the sewing needle N,
The position can be adjusted so as to be separated from each other, so that the gap between the sewing needle N and the blade tip 5 can be kept constant even when the sewing needle N having a different thickness is exchanged according to the workpiece W. It has become. Also, in the intermediate pot 3b of the rotary pot 3,
An inner hook retainer (not shown) is provided to prevent the inner shuttle 3b from rotating following the outer shuttle 3a. The inner shuttle retainer is rotated by a lifting / lowering path N1 of the sewing needle N therebetween. A thread loop receiving member (not shown) located on the opposite side of the shuttle 3 is provided. The yarn loop receiving member and the yarn loop 1a
The thread loop 1a is guided in the direction of the blade point of the rotary hook 3 by making contact with the tip of the rotary hook 3, so that the blade point 5 can properly catch the thread loop 1a.

[0006]

However, the conventional sewing machine has the following problems. That is, the sewing needle N is exchanged according to various sewing objects W, and the sewing needle N is changed.
When the position of the sword tip 5 and the sewing needle N of the rotary hook 3 is adjusted according to the thickness of the rotary hook 3, the position of the thread loop receiving member installed on the rotary hook 3 also changes. In some cases, the thread loop receiving member cannot perform a predetermined operation. That is, when using the thin sewing needle N, when the rotary hook 3 is brought close to the sewing needle N so as to form an appropriate gap between the sewing needle N and the blade point 5 of the rotary hook 3, the sewing needle N
, The thread loop receiving member provided on the opposite side of the rotary hook 3 is separated from the sewing needle N on the contrary.

The thread loop receiving member that is too far from the sewing needle N cannot guide the thread loop 1a formed by the sewing needle N to a position where the rotary hook 3 can properly catch it. In this way, the rotary hook 3 rotates without catching the thread loop 1a, and so-called stitch skipping in which a stitch is not formed occurs.

Therefore, as a countermeasure against this, as shown in FIG. 9, a pipe 4 provided with a bulge 4a on one side is provided on the back surface of the needle hole 2 of the needle plate A2, and the yarn loop 1a is rotated by the bulge 4a. There is one in which the hook 3 projects only in the direction of the sword tip. Accordingly, since the left side wall of the needle hole 2 and the pipe 4 in the figure extends downward substantially linearly, for example, when a thick sewing needle is used, the sewing needle N
The left side wall of the pipe 4 which is in contact with the sewing thread 1 held by the sewing needle N so as not to hinder the elevation of the sewing needle N
Thus, an appropriate gap is formed. The sewing thread 1
Is extruded from the needle hole Na to the bulge 4a, and the thread loop 1a is formed so as to protrude only in the direction of the blade point of the rotary hook 3.

When a sewing needle N having a very small thickness is used, a gap between the left side wall of the pipe 4 and the sewing needle N which moves up and down becomes large, so that the bending of the sewing thread 1 is pushed out from the needle hole Na to the bulge 4a. Insufficient quantity. Since the right side wall of the pipe 4 also extends downward in a straight line with the needle hole 2, the size of the thread loop 1a is limited by the straight portion of the pipe 4 regardless of the size of the bulge 4a. Will be enough.
Therefore, there is a possibility that the blade point of the rotary hook 3 rotates without catching the thread loop 1a, so that a seam is not formed.

[0010]

SUMMARY OF THE INVENTION A needle hole device of a sewing machine according to the present invention has a needle needle having a needle through hole through which a sewing needle can be inserted.
Guide member and a needle for detachably supporting the needle guide member
It includes a plate, a title is formed by the needles - rotating the flop
In needle hole device of the sewing machine the hook point that can be captured in the kettle, the
The needle through-hole of the needle guide member is located on the opposite side of the rotary hook from the center of the sewing needle elevating path, including the circular hole including the staggered needle hole on the side of the rotary hook. The inner surface of the circular hole is provided with an abutting portion that comes into contact with the sewing thread held by the sewing needle, and the abutting portion and the sewing thread are brought into contact with each other to form a thread loop near the blade of the rotary hook. A needle hole device for a sewing machine, wherein

[0011]

The needle hole device of the sewing machine according to the present invention is provided with a circular hole including a deviated needle hole on the blade point side of the rotary hook from the center of the lifting / lowering path of the sewing needle, and the rotary hook with the lifting / lowering path of the sewing needle interposed therebetween. The contact part formed on the inner surface of the circular hole opposite to the point of the sword,
One side sewing thread that is folded back to both sides from the needle hole of the sewing needle,
That is, the sewing needle is brought into contact with the sewing thread that is turned back to the opposite side of the rotary hook from the blade point.

When the sewing needle is raised, the bending of the sewing thread generated between the sewing needle and the opposite side of the rotary hook from the sword tip is pushed out from the needle hole of the sewing needle toward the sword tip of the rotary hook by the abutting portion. The thread loop is made to protrude only in the direction of the blade point of the rotary hook. As a result, the point of the rotary hook can reliably catch the thread loop having a large shape, and an appropriate stitch without skipping can be formed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The same or corresponding parts as those in the conventional example will be described with the same reference numerals. 1 and 2 are views showing an embodiment of the present invention. In FIG. 1, A denotes a needle hole device of a sewing machine. The needle hole device A of the sewing machine includes a needle guide member A1 having a needle through hole B through which a sewing needle N is inserted, and the needle guide member A1 is detachably attached. It comprises a supporting needle plate A <b> 2, and is installed between the work W and the rotary hook 3.

The needle through hole B of the needle guide member A1
Is formed by a circular hole including a needle hole, the center position B1 of which is deviated from the lifting / lowering path N1 of the sewing needle N toward the blade point of the rotary hook 3, and the rotary hook 3 is interposed between the lifting / lowering path N1.
The abutment portion C which is in contact with the sewing thread 1 held by the sewing needle N is formed on the inner surface opposite to the point of the sword. Further, the contact portion C forms a slight gap with the sewing needle N that moves up and down so as not to hinder the elevation of the sewing needle N.

Next, the operation of the needle hole device A of the sewing machine will be described with reference to FIG.
This will be described below. As shown in FIG. 2 (a), when the sewing needle N penetrates the workpiece W and passes through the needle through hole B of the needle hole device A of the sewing machine, the center is deviated toward the rotary hook 3 to move the needle N up and down. An abutment portion C constituted by an inner surface opposite to the rotary hook 3 with N1 interposed therebetween is one side of the sewing thread 1 folded back from the needle hole Na of the sewing needle N to both side portions of the sewing needle N, that is, the sewing. The needle contacts the sewing thread 1 on the opposite side (left side in the figure) of the rotary hook 3 via the needle N.

Then, when the sewing needle N rises, the sewing thread 1
Attempts to bend so as to form loops of the same shape on both sides of the needle hole Na as shown in FIG.
As shown in FIG. 2B, the contact portion C that contacts one side (the left side in the figure) of the sewing thread 1 causes the bending of the sewing thread that occurs with the rise of the sewing needle N from the needle hole Na to the other side (the right side in the figure). And the yarn loop 1a is formed so as to protrude largely only in the direction of the rotary hook 3. That is, the sewing thread 1 that comes into contact with the contact portion C is sandwiched between the sewing needle N and the contact portion C, and cannot bend (loop) even if the sewing needle N rises. The sewing thread 1 is linearly formed along the sewing needle N, and the bending amount of the sewing thread 1 is fed out from the needle hole Na toward the blade point of the rotary hook 3 as the sewing needle N rises. At this time, the distorted needle through hole B (circular groove including the needle hole)
In this case, since a large gap exists on the right side of the sewing needle N, the thread loop 1a is extended in the direction of the blade point of the rotary hook 3 without being restricted by the gap.

The thread loop 1a is formed only on the blade point side of the rotary hook 3, and this thread loop 1a is approximately twice as large as the thread loop 1a formed on the blade point side of the conventional rotary hook 3. As a result, the point of the rotary hook 3 can reliably catch the thread loop 1a that protrudes greatly, and it is possible to form an appropriate seam without skipping. When the sewing needle N is exchanged according to the sewing object W, the needle needle member A1 having the needle through hole B and the contact portion C according to the thickness of the sewing needle N can be exchanged as described above. Similarly, the thread loop 1a can be guided to a position where the blade point of the rotary hook 3 can be sufficiently captured.

FIGS. 3 and 4 show another embodiment of the present invention. As shown in FIGS. 3 and 4, the needle hole device A of this embodiment has a large-diameter circular hole B2 centered on an ascending / descending path N1 of the sewing needle N, and a large-diameter circular hole. A small-diameter circular hole B3 including a needle hole deviated from the center of the ascending and descending path N1 of the sewing needle N to the sword tip side of the rotary hook 3 below the lower side of B2, and the ascending and descending path N1 of the sewing needle N On the inner surface of the small-diameter circular hole B3 opposite to the point of the sword,
There is provided a contact portion C which comes into contact with the sewing thread held by the sewing needle N. The contact portion C forms a slight gap between the needle N and the needle N that moves up and down so as not to hinder the elevation of the needle N.

A needle hole device A for a sewing machine having the above-described configuration.
As in the above-described embodiment of the present invention (see FIGS. 2 (a) and 2 (b)), the contact portion C and the sewing thread 1 are brought into contact with each other, and the thread loop 1a is brought closer to the blade point of the rotary hook 3. It is possible to form an appropriate seam by reliably catching the thread loop 1a at the blade point of the rotary hook 3.

Further, in the needle hole device A of the sewing machine, the elevating / lowering path N1 of the sewing needle N and the center position of the opening (large-diameter circular hole B2) on the workpiece W side are set to coincide. Therefore, no matter what direction the workpiece W is sent in the pattern sewing machine or the like, as shown in FIG. 4A, the sewing needle N is moved from the elevation path N1 to the edge of the needle through hole B (circular groove B2). Are equal and the frictional resistance between the sewing thread 1 and the edge of the needle hole device A of the sewing machine is constant, so that the thread can be uniformly tightened by the balance of the sewing machine and an appropriate pattern stitch is formed. .

In the needle hole device A of the sewing machine shown in FIGS. 1 and 3, the contact portion C is formed by forming one or two circular holes. For example, as shown in FIG. The contact portion C may be formed by an inclined portion which is inclined so as to protrude toward the rotating hook in the direction of the rotating hook in the direction of the rotating hook below the needle hole device of the sewing machine as shown in FIG. The same effect can be obtained even if the abutting portion C is formed by fixing the protruding member protruding toward. Further, the needle guide member A1 described in the above embodiment and other embodiments is mounted on the needle plate A2 via a positioning member such as a pin, but of course, the needle guide member A1 is integrated with the needle plate A2. You may comprise.

[0022]

As described above, in the needle hole device of the sewing machine according to the present invention, the needle through hole for inserting the sewing needle is deviated from the center of the ascending / descending path of the sewing needle to the sword tip side of the rotary hook. And a contact portion which is in contact with a sewing thread held by the sewing needle on the inner surface of the circular hole opposite to the rotary hook with the sewing needle elevating path interposed therebetween. The thread loop is formed near the sword tip of the rotary hook by contacting the sewing thread with the sewing thread. It is possible to make a great seam. A needle guide member having a needle hole;
Is detachable from the needle plate. Therefore, based on the sewing conditions,
If the sewing needle has been replaced,
Replacement with a needle guide member having a needle through hole and a contact part
It can be done easily.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a needle hole device of a sewing machine according to the present invention.

FIGS. 2A and 2B are diagrams showing the operation of the needle hole device of the sewing machine shown in FIG. 1, wherein FIG. 2A shows the state when the sewing needle is lowered, and FIG. 2B shows the state when the thread loop is formed when the sewing needle is raised. It is an explanatory side view shown.

FIG. 3 is an explanatory cross-sectional view showing another embodiment of a needle hole device of a sewing machine having a needle through-hole having a circular opening centered on a vertical movement path of a sewing needle.

4A and 4B show a needle through hole of the needle hole device of the sewing machine shown in FIG. 3, wherein FIG. 4A is a plan view and FIG. 4B is an explanatory perspective view.

5A and 5B are views showing another embodiment of the needle hole device of the sewing machine, and FIG. 5A is a cross-sectional view showing the needle hole device of the sewing machine formed by a projecting portion having an inclined contact portion, and FIG. () Is a cross-sectional view showing a needle hole device of the sewing machine in which the contact portion is formed by fixing a protruding member.

FIG. 6 is an explanatory side view showing a conventional needle hole device of a sewing machine.

7 is an explanatory side view of the sewing machine provided with the needle hole device of the sewing machine shown in FIG. 6, when the sewing needle is lowered.

8 is an explanatory side view of the sewing machine provided with the needle hole device of the sewing machine shown in FIG. 6 when the sewing needle is raised.

FIG. 9 is a side view of another example showing a sewing machine provided with a conventional needle hole device of the sewing machine.

[Explanation of symbols]

 Reference Signs List 1 sewing thread 1a thread loop 3 rotary hook A needle hole device of sewing machine B needle through hole C contact part N sewing needle W sewing object

Claims (1)

(57) [Scope of request for utility model registration] A needle needle having a needle through hole through which a sewing needle can be inserted.
And a needle plate for detachably supporting the needle guide member.
And the point of the rotary hook catches the thread loop formed by the sewing needle.
In a possible needle hole device of a sewing machine, the needle through-hole of the needle guide member is provided between a circular hole including a needle hole deviated from the center of the elevating path of the sewing needle toward the blade point of the rotary hook, and the elevating path of the sewing needle. The rotary hook has a contact portion in contact with the sewing thread held by the sewing needle on the inner surface of the circular hole on the opposite side of the sword tip of the rotary hook, and the thread portion is brought into contact with the contact portion and the sewing thread. −
A needle hole device for a sewing machine, wherein a buckle is formed near a sword of a rotary hook.