JPH1190078A - Rotary shuttle for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use no opener and enable the smooth passage of a needle thread through a part in which engagement members engage with a shuttle body even in a low-speed rotation area, for example, in the rotary shuttle for a sewing machine equipped with a rotating hook and a shuttle body which are fitted into each other in a freely rotatable manner and the engagement members which curb the rotation of the shuttle body engaged with a specified area on the shuttle body. SOLUTION: An engagement face 3S which extends in a direction in which a rotating hook rotates is provided in an area with which engagement members 4a, 4b come into contact in a shuttle body. In addition, the lower end of the engagement face 3S extends below the area with which the engagement members 4a, 4b come into contact. Further, an inclined part which guides a thread moving along the base part of an extruded part 3b upward or in the diametral direction by the rotation of the rotating hook, is formed on the base part of one of the sides of the protruded part 3b which forms the engagement face 3S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine comprising: an outer hook and an inner hook rotatably fitted to each other; and a locking member locked at a predetermined portion of the inner hook to prevent rotation of the inner hook. Related to rotary pots.

[0002]

2. Description of the Related Art Generally, as a rotary hook of a sewing machine, FIG.
22 are known. This rotary hook, which is a first conventional example, is rotatably fitted to an outer hook P2 fixed to a hook shaft P1 that rotates in synchronization with a vertical movement of a sewing needle (not shown), and to the outer hook P2. Inner pot P3 and locking member P
4a and P4b. Inner pot P3 is outer pot P
2, a force is applied to rotate in the same direction (arrow F) as the outer shuttle P2, but this rotation is suppressed by the locking members P4a and P4b. Locking members P4a, P
An inner hook protruding portion P3b that is in contact with 4b is formed.

The rotary hook has an opener mechanism for allowing the upper thread P5 to move the inner hook P3 smoothly in conjunction with the rotation of the outer hook P2. The opener mechanism is
When the upper thread P5 passes through the path A1, the opener P6 moves in the direction of the arrow B1, thereby rotating the inner hook P3 in the direction of the arrow C1 with the inner hook rotation center P3a as a fulcrum, and the inner hook projecting portion P3b. A gap is created between the locking member P4a and the locking member P4a. When the upper thread P5 passes through the route A2 or the route D, the opener P6 moves in the direction of arrow B2, so that the inner shuttle P3 rotates in the direction of arrow C2 with the rotation of the outer shuttle P2, Between the inner hook protruding portion P3b and the locking member P4b, and between the inner hook P3 and the opener P6
And a gap is formed between them.

Further, as a second example of a rotary hook of a general sewing machine, Japanese Patent Application Laid-Open No. 7-1440 as shown in FIGS.
No. 80 discloses a rotary kettle of a sewing machine disclosed in Japanese Patent Application Laid-Open No. HEI-8-280. This rotary pot
Instead of the above opener mechanism, the outer hook rotation center P2a
And the rotation center P3a of the inner hook is deviated from the outer hook P2.
Is rotated, the inner hook projecting portion P3b and the locking member P4a perform a movement of opening and closing due to the above-described bias, and when the upper thread (not shown) passes between the inner hook projecting portion P3b and the locking member P4a. When this interval is opened and the upper thread passes between the inner hook projecting portion P3b and the locking member P4b, the inner hook projecting portion P3b
And the locking member P4a repeats the closing motion.

[0005]

However, in the case of the above-described first conventional example, the conventional sewing rotary hook has an opener P6 which collides with the inner hook P3 to cause the inner hook projecting portion P3b to open and close. An impact sound is generated between P6 and the inner pot P3.

In the case of the second example, the opening and closing movement of the inner hook projecting portion P3b becomes smaller as the rotation speed becomes lower, so that the upper thread passes between the inner hook projecting portion P3b and the locking member P4a. Pushing the upper thread upwards requires more force,
If this force is weak, there is a problem that the upper thread cannot pass smoothly.

FIGS. 24 and 25 show a conventional rotary hook.
Since the lower surface P3c of the inner hook projecting portion is located above the lower surface P4c of the locking member P4a as shown in FIG.
, And there is a problem that the smooth passage of the upper thread is hindered by the penetration.

Further, as shown in FIGS. 26 and 27 (FIG.
7 is a view of the shuttle of FIG. 26 viewed from the X direction with the Y direction left and right. In the conventional rotary hook, when the upper thread tries to pass through between the inner hook projecting portion P3b and the locking member P4a, the upper thread is rotated to the point P5 by the rotation of the outer hook P2.
b2 to the point P5c2 and the rising portion of the inner hook projecting portion P3b (the inner hook projecting portion P through which the upper thread passes).
3b), the upper thread moves from point P5b1 to point P5c1.

However, the inner hook projecting portion P3b is
3, the upper thread that moves on the rising portion of the inner hook projecting portion P3b hardly changes its position in the Y direction when viewed from the X direction, as shown in FIG. The bending angle of the upper thread that has the effect of pushing up the thread is θ
Since there is little change from 1 to θ2 with little change, the force for pushing up the upper thread from the point P5h1 of the locking portion to the point P5h2 does not increase, so that the inner hook projecting portion P3b and the locking member P4a do not separate. In this case, there occurs a problem that the upper thread cannot pass smoothly.

The present invention has been made in view of the above situation, and has an outer shuttle and an inner shuttle rotatably fitted to each other.
In a rotary hook of a sewing machine having a locking member that is locked to a predetermined portion of the inner hook and suppresses rotation of the inner hook, the upper thread can smoothly pass through a locking portion between the locking member and the inner hook. It is an object of the present invention to provide a rotary hook of a sewing machine that allows an upper thread to pass smoothly even without using an opener and in a low rotation range.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is provided in which an outer hook and an inner hook rotatably fitted to each other and a predetermined portion are held by a frame of the sewing machine. A rotating hook of a sewing machine comprising a locking member that locks a part of the inner hook to prevent rotation of the inner hook. A locking surface is provided, and the lower end of the locking surface extends below the contact portion of the locking member with the bottom side of the shuttle facing downward and the opening side facing upward.

According to the first aspect of the present invention, the lower end of the locking surface of the inner hook is locked while the upper thread passing over the upper side of the outer hook passes through the contact portion between the inner hook and the locking member. Since the lower thread extends below the contact portion of the member, first, the upper thread comes into contact with the locking surface, and then rises along the locking surface to make contact with the locking member and the inner hook. Go through. Therefore, in the conventional rotary hook of the sewing machine in which the lower surface of the locking portion of the inner hook is provided higher than the lower surface of the contact member, there is a problem that the upper thread may pass under the locking portion of the inner hook. On the other hand, in the present invention, this problem is avoided, and the upper thread can pass smoothly.

Here, the locking surface of the inner hook can be formed, for example, so as to protrude in the radial direction on the outer peripheral surface of the inner hook, but it is not limited to this forming place and shape. It may be formed on the upper surface or side edge of the shuttle, or may be formed by engraving a part of the inner shuttle into a concave shape.

According to a second aspect of the present invention, an outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and an inner hook locked to the protruding portion are provided. A locking member for preventing rotation of the sewing machine, and a thread of the sewing machine passes upward through a contact portion with the locking member from one side of the protruding portion, with the bottom side of the hook down and the opening side up. A rotary hook of a sewing machine, wherein a slant that guides, at least in an upward or radial direction, a thread that moves along the base of the protrusion by rotation of an outer hook on which the thread is hung on the base on one side of the protrusion; The configuration is such that a part is formed.

According to the second aspect of the present invention, in the process of the yarn passing through the contact portion between the inner hook and the locking member, the yarn is guided upward or radially of the inner hook by the above inclination. The angle at which the yarn is bent (θ1 to θ2 in FIG. 4) which has the effect of pushing up the upper thread becomes steep, and the force for pushing up the thread at the contact portion increases, enabling smooth passage of the thread.

Here, the above-mentioned inclined portion is, for example, an arc or a straight inclined portion which is gently continuous with the outer peripheral surface of the inner hook at the root of the one side of the above-mentioned protruding portion (see inclined portions G and G1 in FIGS. 3 and 5). )
Or a slope (see slope H in FIG. 6) protruding upward in the direction of increasing diameter at the base of the protrusion.

According to a third aspect of the present invention, there is provided an outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and an inner hook locked to the protruding portion. A locking member for preventing rotation of the sewing machine, and a thread of the sewing machine passes upward through a contact portion with the locking member from one side of the protruding portion, with the bottom side of the hook down and the opening side up. And a rotary hook of a latch-type sewing machine having a claw piece for holding a bobbin over a predetermined portion of an opening of the inner hook, wherein the height of the upper end of the outer peripheral portion of the inner hook is at least one side direction from the protrusion. In a part of the range, the position is higher than the upper end of the protrusion.

Generally, in a conventional latch-type rotary rotary hook, a part of the bobbin is held by being covered by a claw piece, so that the height of the outer peripheral portion of the inner hook is formed lower than the claw piece, and the bobbin is removed. Is easy. Further, the protruding portion locked by the locking member is formed at a position higher than the outer peripheral portion of the inner hook because the outer peripheral portion of the inner hook is lower. Therefore, the height of the yarn moving along the outer peripheral portion of the inner hook does not increase so much in the process of the yarn passing through between the protrusion and the locking member. Accordingly, the yarn bending angle exerting the action of pushing up the yarn (FIG. 28)
(See θ1 in the middle) became a gentle angle, the force for pushing up the yarn at the contact portion did not increase, and the smooth passage of the yarn was hindered.

Therefore, according to the third aspect of the present invention, since the height of the outer peripheral portion of the inner hook is higher than the upper end of the projecting portion, the yarn is moved between the projecting portion and the locking member. In the process of removing the thread, the angle at which the thread breaks up (see θ2 in FIG. 9), which has the effect of pushing up the thread, becomes a steep angle, and the force for pushing up the thread at the contact portion increases to allow the thread to pass smoothly. Can be done.

Note that the above-mentioned partial range hung from the protruding portion in the one side direction means, in other words, that when the yarn passes through a contact portion between the protruding portion and the contact member, the yarn is rotated by the rotation of the outer hook. This is the range in which the inner pot side edge moves.

According to a fourth aspect of the present invention, in the rotary hook of the sewing machine according to the third aspect, at least the height of the upper end of the outer peripheral portion of the inner hook is increased when the holding by the claw pieces is released from the bobbin. The height of the upper end of the outer periphery of the inner pot, which is formed lower than the upper surface of the bobbin,
In any part other than the part of the range, the lower part is formed lower than the upper surface of the bobbin to be accommodated.

According to the fourth aspect of the present invention, the bobbin can be easily removed at a position where the upper end of the outer peripheral portion of the inner hook is formed lower than the bobbin at least in a state where the holding by the claw pieces is released from the bobbin. In addition to this, the lower portion is in a range irrelevant to the operation of the third aspect, so that the effect of the third aspect is exhibited as it is.

According to a fifth aspect of the present invention, in the rotary hook of the sewing machine according to the third aspect, at least an outer periphery of an upper surface of the bobbin is exposed at an upper end of an inner peripheral portion of the inner shuttle in a state in which the holding of the claw is released from the bobbin. The chamfer to be formed is formed

According to the fifth aspect of the present invention, even if the upper end of the outer peripheral portion of the inner hook is formed higher than the bobbin, the bobbin can be easily removed by the chamfer.

According to a sixth aspect of the present invention, there is provided an outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and an inner hook locked to the protruding portion. A locking member for preventing rotation of the sewing machine, and a thread of the sewing machine passes upward through a contact portion with the locking member from one side of the protruding portion, with the bottom side of the hook down and the opening side up. A latch-type sewing machine rotary hook having a claw that holds a bobbin over a predetermined portion of an opening of an inner hook, wherein the claw is moved on the claw by rotation of an outer hook. Is formed to have a convex portion for pushing upward.

According to the sixth aspect of the invention, the thread moving on the claw piece is pushed up over the convex portion,
Since the amount of consumption of the yarn increases and the yarn tension increases, in the process of the yarn passing between the protrusion and the engaging member, the force for pushing up the yarn at the contact portion increases, and the yarn can pass smoothly. I can do it.

Here, it is preferable that the position of the top of the above-mentioned convex portion is after the position where the yarn moving above the inner hook passes at the timing when the yarn passes between the projecting portion and the locking member. According to this configuration, the above-described operation and effect can be ensured.

According to a seventh aspect of the present invention, there is provided an outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and an inner hook locked to the protruding portion. A locking member for preventing rotation of the sewing machine, and a thread of the sewing machine passes upward through a contact portion with the locking member from one side of the protruding portion, with the bottom side of the hook down and the opening side up. A latch-type sewing machine rotary hook having a claw for holding a bobbin over a predetermined portion of an opening of an inner pot, wherein the claw is hung from a central portion of the inner pot to a side edge portion when viewed from above. The angle between a straight line connecting the central portion of the inner hook and the protruding portion and a straight line connecting the center portion of the inner hook and the side edge portion over which the claw pieces are extended from the protruding portion. It was configured to be provided in a range of 30 ° to 70 ° toward the one side direction.

According to the seventh aspect of the present invention, since the length of the yarn passed from the projection of the claw to the outer periphery of the inner hook is shortened, no extra slack is generated in the upper yarn. Since the upper thread tension is not attenuated, the force for pushing up the thread at the contact portion is not attenuated in the process of the thread passing between the projecting portion and the locking member, and the thread can pass smoothly.

The invention according to claim 8 is characterized in that an outer hook and an inner hook rotatably fitted to each other, a protruding portion radially projecting from an outer peripheral surface of the inner hook, and an inner hook locked to the protruding portion. A locking member that suppresses rotation of the horizontal sewing machine, wherein the thread of the sewing machine passes through the contact portion with the locking member from one side of the protrusion and crosses the hook. In this configuration, the side with the thread pull-out portion where the yarn passes from the side surface to the bottom surface of the inner hook with the rotation of the outer hook is inclined in a direction closer to the needle plate.

According to the eighth aspect of the present invention, since the side of the inner hook to which the yarn passes is inclined in a direction closer to the needle plate, it is difficult for the thread to pass to the bottom side of the inner hook, and the maximum tension is applied to the thread. The timing to start is delayed. Therefore, even in the process in which the yarn passes between the protruding portion and the locking member, the yarn tension is maintained at a high state, the force for pushing up the yarn at the contact portion increases, and the yarn can pass smoothly. .

Here, the configuration in which the inner shuttle is inclined with respect to the needle plate may be a configuration in which the inner shuttle is tilted together with the outer shuttle and the shuttle shaft.
By forming the race portion of the inner hook by tilting, the inner hook can be tilted only while the outer hook and the hook shaft are arranged in a standard manner with respect to the needle plate.

According to a ninth aspect of the present invention, there is provided an outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and an outer hook with respect to the protruding portion. An engaging groove for loosely engaging the front and rear portions in the rotational direction, and a locking member for suppressing rotation of the inner hook by this engagement, and a thread of the sewing machine is provided from one side of the protrusion. A rotary hook of a horizontal sewing machine that passes through a hook through a contact portion with a locking member, wherein the protruding portion is arranged to be shifted in the same direction as the rotation direction of the outer hook.

According to the ninth aspect of the present invention, it is possible to delay the timing at which the thread passing over the hook bottom crosses from the side surface to the bottom side of the inner hook due to the misalignment between the engagement groove and the center of the inner hook. I can do it. Therefore, the length of time in which the tension applied to the yarn is high is long, and the yarn tension is maintained in a high state even in the process in which the yarn passes between the protrusion and the locking member,
The force for pushing up the yarn at the contact portion increases, and the yarn can be passed smoothly.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. First Embodiment FIG. 1 is a top view of a rotary hook of a sewing machine according to a first embodiment of the present invention, and FIG. 2 is a side view of a protruding portion 3b of the inner hook as viewed from the direction of arrow L. FIG. The rotary hook of the present embodiment is a horizontal hook in which the hook shaft 1 is vertically arranged, and the hook shaft 1, the outer hook 2, the inner hook 3, and the locking members 4a and 4b for regulating the rotation of the inner hook 3 are provided. Be composed.

The outer shuttle 2 is fixed to a shuttle shaft 1 which rotates in synchronization with a vertical movement of a sewing needle (not shown). The inner shuttle 3 is rotatably fitted to the outer shuttle 2. The inner shuttle 3 is rotated by the rotation of the outer shuttle 2, and a force to rotate in the same direction (arrow F) as the outer shuttle 2 acts. However, the locking members 4 a and 4 b are loosely fitted to the protruding portions 3 b of the inner shuttle 3. As a result, the rotation of the inner hook 3 is prevented.

The center 3a of rotation of the inner hook 3 is deviated from the center 2a of rotation of the outer hook 2, and this deviation causes
The protruding portion 3b of the inner hook 3 swings between the locking members 4a, 4b so that the yarn can easily pass between the protruding portion 3b and the locking members 4a, 4b.

The projecting portion 3b is provided on the upper part of the outer peripheral surface of the inner hook 3 so as to protrude in a radial direction, and as shown in FIG. It is a locking surface that comes into contact with the locking member 4a. Also,
The lower surface 3c of the projecting portion 3b has a lower surface 4c of the locking member 4a.
The protrusion 3b has a thickness located below the protrusion 3b, and the side surface 3s of the protrusion 3b protrudes below the locking member 4a.

The rising portion of the protruding portion 3b of the inner hook 3 has an R
An inclined surface G having a shape is formed. The rising portion is a base portion of the protruding portion 3b on the side in contact with the locking member 4a, and is a portion along which the upper thread moves while the upper thread passes through the contact portion. In addition, this slope G
What is necessary is just to be provided in the upper end part of the inner hook 3 in the rising part.

In the above configuration, when the rotary hook is rotating at a high speed and the outer hook 2 is rotated, the inner hook projecting portion 3b is located on the opposite side from the position in contact with the engaging member 4a due to the above-mentioned bias. The outer hook 2 moves to the lifting member 4b and comes into contact with the lifting member 4a by the rotation of the outer hook 2 again. When the upper thread passes between the protruding portion 3b and the engaging member 4a, the protruding portion 3b moves to the opposite engaging member 4b, and the upper thread moves to the protruding portion 3b.
The protruding portion 3b moves to the lifting member 4a when passing between the lifting member 4b and the lifting member 4b. By repeating the opening / closing movement at this timing periodically, the upper thread can move smoothly in the inner shuttle 3.

When the rotary hook is rotating at a low speed, the opening / closing movement between the inner hook protruding portion 3b and the lifting member 4a due to the above-mentioned bias becomes small, but as shown in FIG. The lower thread 3c is located below the lower face 4c of the lifting member 4a, so that the upper thread moves upward between the inner hook projection 3b and the lifting member 4a while hitting the side surface 3s of the inner hook projection 3b. Then, the upper thread is prevented from getting under the inner hook protruding portion 3b.

FIGS. 3 and 4 are explanatory diagrams for explaining the movement path of the upper thread in the rotary hook. 3 is a top view of the rotary hook, and FIG. 4 is a side view of the inner hook projecting portion 3b viewed in the X direction with the Y direction left and right.

As shown in FIGS. 3 and 4, the upper thread 5 further moves from the point 5b2 to the point 5c with the rotation of the outer hook 2.
2 and at the rising portion of the inner hook protruding portion 3b, it moves from the point 5b1 on the slope G to the point 5c1.
For this reason, the upper thread at the rising portion has the protrusion 3b and the locking member 4
The angle of approach of the upper thread approaching the contact portion with the upper thread a is sharpened from θ1 to θ2. By sharpening the angle of this bend, a point 5h2 from the point 5h1 where the upper thread is caught and which passes through the upper contact portion.
The force for pushing up the inner thread is increased, and this force is greater than the force for sandwiching the inner hook projecting portion 3b and the engaging member 4a.

As described above, according to the rotary hook of the sewing machine of this embodiment, the protruding portion 3b of the inner hook 3 is formed below the locking member 4a, and the rising portion of the protruding portion 3b is formed. Is provided with a slope G, so that the upper thread can smoothly pass over the shuttle even at the time of low rotation, and proper sewing quality can be obtained without an opener mechanism.

Since no opener mechanism is required, the impact sound is reduced and the working environment is improved. Further, since there is no complicated opener mechanism, the speed can be easily increased, the sewing machine mechanism can be simplified, and the cost can be significantly reduced. Further, the operation of adjusting the opener mechanism becomes unnecessary, the efficiency of the sewing operation is improved, and the error of the adjustment value is eliminated, so that stable and stable sewing quality can be obtained.

The present invention is not limited to the rotary hook of the sewing machine according to this embodiment, and can be appropriately changed without departing from the gist of the invention. For example, the effect obtained by the locking surface of the protrusion 3b protruding below the locking member 4a is not limited to the position where the locking surface is formed.
The following various variations are also possible for the inclined portion formed at the rising portion b.

FIG. 5 is a partial view showing a modification of the above-mentioned inclined portion. As shown in the figure, instead of the above-mentioned R-shaped inclined portion G, a tapered inclined portion G1 may be provided, and the same operation and effect as in the case of the R-shaped can be obtained.

FIG. 6 also shows a modified example of the above-mentioned inclined portion, and is a partial view of the protruding portion viewed from the side similarly to FIG. The inclined portion H is formed so as to extend outward on the upper surface side of the protruding portion 3b and rise upward. In this configuration, when the outer hook 2 rotates, the upper thread on the inner hook projecting portion 3b moves from the point 5b1 to the point 5c1 along the inclined portion H. Thus, the angle of the upper thread caught at the contact portion between the protruding portion 3b and the locking member 4a becomes θ.
The angle becomes a steep angle from 1 to θ2, and the force for pushing the upper thread from the point 5h1 to the point 5h2 passing through the upper contact portion is increased. When this force is greater than the force between the inner hook projecting portion 3b and the engaging member 4a, the upper thread slips upward to move the inner hook 3 smoothly.

[Second Embodiment] FIGS. 7 to 9 show a rotary hook of a latch type sewing machine according to a second embodiment of the present invention. FIG. 7 is a side view of the inner hook. FIG. 8 is a top view of the inner hook, and FIG. 9 is a side view of the periphery of the protruding portion 3b for explaining how to thread the yarn on the rotary hook. The rotary hook of the sewing machine according to this embodiment is a latch-type rotary hook that presses the bobbin by holding the clasp 7 as a claw piece over a part of the upper surface of the bobbin. In this latch type rotary hook, the configuration peculiar to this embodiment is that the height of the protruding portion 3b of the inner hook 3 is formed lower than the upper surface B of the side edge 3e of the inner hook 3, and The height of the upper surface B of the side edge 3e is the same as or higher than the upper surface C of the clasp 7.

A projection 3b at the upper end of the inner surface of the inner hook 3
A chamfer is formed in a range D away from the bobbin. When at least the catch 7 is raised and the holding of the bobbin is released, the outer periphery of the upper surface of the bobbin is located above the lower end of the chamfer, and the bobbin is easily taken out. You can do it. The range D in which the chamfer is formed may be an arbitrary range such as the vicinity of the protruding portion 3b.

As shown in FIG. 9, in the above configuration,
The rotation of the outer hook 2 causes the upper thread to move into the inner hook projecting portion 3b and the locking member 4
At the time of the rising of the inner hook protruding portion 3b, the upper thread moves at a point 5c1 higher than the above-mentioned contact portion, so that the angle formed by the portion where the upper thread is caught is a steep angle of θ2. , And the force for pushing up from the point 5h1 where the upper thread is hooked to the point 5h2 passing through the upper contact portion increases. Therefore, the upper thread easily moves upward and smoothly moves the inner shuttle 3.

As described above, according to the rotary hook of the sewing machine of this embodiment, the height of the projection 3b is
e is formed lower than the upper surface B of the inner hook 3 and the height of the upper surface B of the side edge 3e of the inner hook 3 is set to be the same as or higher than the upper surface C of the clasp 7, so that even during low rotation, The upper thread can smoothly pass over the hook, and proper sewing quality can be obtained without an opener mechanism.

FIG. 10 is a side view of the inner hook showing another example of the structure for facilitating the removal of the bobbin. In the second embodiment, as a result of forming the upper surface of the inner pot 3 high, when the bobbin is taken out, the outer periphery of the upper surface of the bobbin falls down from the upper surface of the inner pot 3, making it difficult to remove the stored bobbin. A chamfer is provided at the upper end of the inner surface of the inner pot 3 to facilitate removal of the bobbin. However, as another configuration for facilitating the removal of the bobbin, as shown in FIG. The same effect can be obtained even if the predetermined range D1 is set low. The predetermined range D1 on the upper surface of the inner hook 3 is formed lower than the outer periphery of the upper surface of the bobbin when at least the catch 7 is raised to release the bobbin. Note that the predetermined range D1 in which the upper surface is formed low may be an arbitrary range as long as it is other than where the rising portion of the protruding portion 3b is located.

[Third Embodiment] FIGS. 11 to 15 are similar to FIGS.
FIG. 11 shows a rotary hook of a sewing machine according to a third embodiment of the present invention. FIG. 11 is a top view of the rotary hook, and FIG.
FIG. 13 is a partial side view for explaining how to move the upper thread. FIG. 14 shows a clasp 7 as a nail piece.
FIG. 15 is a partial side view showing how the position of the upper thread across the hook changes depending on the difference in the formation of the claw pieces.

The rotary hook of the sewing machine according to the third embodiment is different from the rotary hook of the sewing machine according to the second embodiment in the configuration of the bobbin clasp 7, and other configurations are substantially the same. . On the upper surface of the clasp 7 of this embodiment, a convex portion is formed which pushes up the upper thread passing over the upper surface of the inner hook 3. The top of the convex portion is formed so as to be a portion through which the upper thread passes when the upper thread passes between the projecting portion 3b and the locking member 4a.

As shown in FIG. 13, when the upper thread tries to pass through the contact portion between the inner hook protruding portion 3b and the locking member 4a by the rotation of the outer hook 2 in the above configuration, the upper surface of the inner hook 3 Is pushed up along the clasp 7 from the point 5b3 to the point 5c3. This push-up increases the consumption of the upper thread and generates a large tension on the entire upper thread. This tension causes the upper thread to project the upper thread 3b and the locking member 4a.
The force for pushing up from the lower point 5h1 of the contact portion to the upper point 5h2 is increased. Therefore, the upper thread easily moves through the inner shuttle 3 through the contact portion.

As shown in FIG. 14, the clasp 7 is preferably provided between 30 ° and 70 ° from the protruding portion 3b toward the rising portion side.
As shown in FIG. 5, the distance from the clasp 7 to the rising portion of the protruding portion 3b is shortened, and no extra slack occurs in the upper thread extending from the clasp 7 to the rising portion of the protruding portion 3b,
The function and effect of the projection formed on the clasp 7 can be ensured.

As a reference, FIG.
FIG. 3 is a partial side view for explaining how the upper thread is passed over the rotary hook provided at the above location. As shown in FIG.
°, the distance from the clasp 7 to the rising portion of the protruding portion 3b increases, and the upper thread may sag in this section. The effect is uncertain.

As described above, according to the rotary hook of the sewing machine of this embodiment, the convex portion is provided on the upper surface of the clasp 7, so that the upper thread can smoothly pass over the hook even at low rotation. , And appropriate sewing quality can be obtained without an opener mechanism.

The present invention is not limited to the rotary hook of the sewing machine according to this embodiment. For example, the shape of the convex portion formed on the upper surface of the clasp 7 and the position of the top are not limited to the above specific examples. It can be changed as appropriate without departing from the gist of the invention.

Fourth Embodiment FIG. 16 and FIG.
FIG. 16 shows a rotary hook of a sewing machine according to a fourth embodiment of the present invention. FIG. 16 is a side view of the inner hook, and FIG. 17 is a bottom view thereof. The rotary hook of the sewing machine according to this embodiment is such that the entire rotary hook (outer hook 2, inner hook 3, and hook shaft 1) is inclined with respect to the needle plate S, and the direction of the inclination is the bottom of the hook. The side where the upper thread that moves across the side moves from the side surface of the inner hook 3 to the bottom surface is in the direction approaching the needle plate S.

According to this configuration, the upper thread crossing the bottom of the hook is moved from the position 5e1 on the side of the inner hook 3 to the position 5e on the bottom.
2, the movement timing is delayed, so that a large amount of yarn is required and a large tension is generated in the entire upper yarn. And the upper thread is the inner hook projecting portion 3b.
When passing through the contact portion between the lock member 4a and the lock member 4a, the large tension allows smooth passage.

For reference, FIG. 30 is a side view of the inner shuttle P3 for explaining the thread transfer condition in the conventional rotary shuttle in which the inner shuttle is arranged horizontally with the needle plate S. In the conventional rotary hook in which the inner hook P3 is arranged horizontally, the upper thread passing over the bottom side of the hook has an inner thread before the upper thread passes through a contact portion between the inner hook protrusion P3b and the locking member P4a. In some cases, the hook P3 may fall off from the point P5e1 on the side surface to the point P5e2 on the bottom surface. In this case, the thread tension suddenly decreases.
The upper thread does not pass through the contact portion smoothly.

As described above, according to the rotary hook of the sewing machine of this embodiment, since the inner hook 3 is arranged to be inclined with respect to the needle plate S, even at a low rotation, the upper thread keeps the hook in the rotary hook. Smooth crossing is achieved, and proper sewing quality can be obtained without an opener mechanism.

In this embodiment, the configuration in which the inner hook 3 is tilted is described as a configuration in which the inner hook 3 is tilted, but the present invention is not limited to this configuration. FIG. 18 is a side view of the inner hook showing another example of the configuration in which the inner pot 3 is inclined. As shown in the figure, the race R of the inner hook 3 is formed to be inclined with respect to the bottom surface of the inner hook 3 without tilting the outer hook or the hook shaft.
Only the inner pot 3 can be tilted. Also in this configuration, the same effect as described above can be obtained.

[Fifth Embodiment] FIG. 19 is a top view showing a rotary hook of a sewing machine according to a fifth embodiment of the present invention. The rotary hook of the sewing machine according to this embodiment has a hook shaft center 1a.
Is offset toward the locking member 4b with respect to the locking members 4a and 4b.

A locking groove is formed between the locking members 4a and 4b so as to be sandwiched between the respective locking surfaces. As shown in FIG. 31, in the conventional rotary hook, the protrusion (P3b
The hook shaft center P1a comes on a straight line extending perpendicularly to the cloth feeding direction from the surface BP on the side where the hook does not contact, but in the rotary hook of this embodiment, the side where the protrusion 3b of the locking groove does not contact. Arrow C from a straight line extending perpendicularly to the cloth feeding direction from the surface B)
The hook shaft center 1a is located at a position shifted in the direction.

According to this configuration, the timing at which the upper thread passing the bottom side of the shuttle from the position 5e on the side of the inner shuttle 3 to the position 5b on the bottom side is delayed by the offset. Accordingly, the thread tension is kept high until the upper thread passes through the contact portion between the projection 3b and the locking member 4a, and the tension allows the upper thread to pass through the contact portion smoothly.

As shown in FIG. 20 showing another example of a configuration in which the relative positions of the locking members 4a, 4b and the hook shaft 1a are shifted, the locking members 4a, 4b are connected to the hook shaft 1a. On the other hand, the same effect can be obtained by offsetting. Furthermore, in the above description, the mounting position of the protruding portion 3b with respect to the inner shuttle 3 is not changed, and the inner shuttle 3 is rotated in the same direction as the rotation direction of the outer shuttle 2. Only the position at which the protruding portion 3b is attached to the inner hook 3 may be changed.

As described above, according to the rotary hook of the sewing machine of this embodiment, since the relative positions of the locking members 4a, 4b and the hook shaft center 1a are offset in the above-mentioned direction, the rotation speed at the time of low rotation is reduced. In addition, the upper thread smoothly passes over the shuttle, and proper sewing quality can be obtained without an opener mechanism.

Further, in the first to fifth embodiments, the description has been made of the eccentric hook type rotary hook in which the rotation center of the outer hook and the rotation center of the inner hook are different. Even if the configuration of the present invention is applied to a normal rotary hook having the same rotation center, the same effect can be obtained although the difference in the effect is not as large as that of an eccentric hook.

[0072]

As described above, according to the rotary hook of the sewing machine of the present invention, the outer hook and the inner hook rotatably fitted to each other, and the rotation of the inner hook locked by the predetermined portions of the inner hook. In a rotary hook of a sewing machine having a locking member for suppressing, for example,
Even when the opener is not used and the rotation speed is low, the upper thread can smoothly pass through the locking portion between the locking member and the inner hook.

[Brief description of the drawings]

FIG. 1 is a top view of a rotary hook of a sewing machine according to a first embodiment of the present invention.

FIG. 2 is a side view of a protruding portion of the rotary hook of FIG.

FIG. 3 is an explanatory view for explaining a moving path of an upper thread in the rotary hook of FIG. 1, and is a view of the rotary hook from above.

FIG. 4 is a side view for explaining a moving path of an upper thread in the rotary hook of FIG. 1 and in which an inner hook protruding portion is viewed left and right in the Y direction and the X direction.

FIG. 5 is a partial top view showing a modified example of the inclined portion of the rising portion, in which the portion of the inner hook protrusion is viewed from above.

FIG. 6 is a partial side view showing a modified example of the inclined portion of the rising portion, in which a portion of the inner hook projecting portion is viewed from the side.

FIG. 7 is a side view of a rotary hook of a latch-type sewing machine according to a second embodiment of the present invention, showing the inner hook.

FIG. 8 is a top view of the inner hook of the rotary hook of FIG. 7;

FIG. 9 is a side view of the vicinity of a protruding portion for explaining how to transfer an upper thread in the rotary hook of FIG. 7;

FIG. 10 is a side view of an inner hook showing another example of a configuration for facilitating removal of the bobbin.

FIG. 11 is a top view showing a rotary hook of a sewing machine according to a third embodiment of the present invention.

FIG. 12 is a side sectional view of an inner hook of the rotary hook of FIG.

FIG. 13 is a partial side view for explaining how to transfer the upper thread in the rotary hook of FIG. 11;

FIG. 14 is a top view for explaining locations where claw pieces of the rotary hook of FIG. 11 are formed.

FIG. 15 is an explanatory diagram illustrating how the position of the upper thread crossing over the hook changes depending on the formation position of the claw piece.

FIG. 16 shows a rotary hook of a sewing machine according to a fourth embodiment of the present invention, and is a side view of the inner hook.

FIG. 17 is a bottom view of the rotary hook of FIG.

FIG. 18 is a side view showing another example of the configuration in which the inner hook is inclined.

FIG. 19 is a top view showing a rotary hook of a sewing machine according to a fifth embodiment of the present invention.

FIG. 20 is a top view showing another example of the configuration in which the relative position between the locking member and the shuttle shaft center is shifted.

FIG. 21 is a top view showing a rotary hook of a sewing machine provided with a conventional opener mechanism, showing a state after an upper thread has passed over half of the hook.

22 is a top view showing a state in which the upper thread has begun to pass over the rotary hook in the rotary rotary hook of FIG. 21.

FIG. 23 is a top view showing a second example of the conventional rotary hook of the sewing machine.

24 is a partial top view of the inner hook protruding portion showing a state where the upper thread is passed in the rotary hook of FIG. 23.

25 is a partial side view of the rotary hook in the state of FIG. 24, in which a protruding portion is viewed from the center of the hook toward the needle plate.

26 is a top view showing a state in which the upper thread in the rotary hook of FIG. 23 moves on the rising portion of the protruding portion.

FIG. 27 is a partial side view of the rotary hook in the state of FIG. 26 as viewed from the side of the protruding portion.

FIG. 28 is a partial side view of the periphery of a protruding portion of a rotary hook of a conventional latch-type sewing machine viewed from the side.

FIG. 29 is an explanatory view for explaining how the position of the upper thread crossing over the hook depends on the formation position of the claw piece, and is a partial side view of the rotary hook provided with a clasp at a location of 70 ° or more. .

FIG. 30 is a side view of an inner rotary hook of a conventional rotary rotary hook provided horizontally with a needle plate.

FIG. 31 is a top view showing a positional relationship between a locking groove and a shaft center of a rotary hook of a conventional sewing machine.

[Explanation of symbols]

 2 Outer hook 3 Inner hook 3b Projection 3s Locking surface G Inclined portion G1 Inclined portion H Inclined portion 4a, 4b Locking member 7 Clasp D Chamfer D1 Inner hook side edge formed lower 5c3 Top of convex portion S Needle Board

Claims (9)

[Claims] An outer hook and an inner hook rotatably fitted to each other, and a part for holding a predetermined portion on a frame of the sewing machine and locking a part of the inner hook to prevent rotation of the inner hook. In the rotary hook of a sewing machine comprising a stop member, a locking surface facing the rotation direction of the outer hook is provided at a position of the inner hook in contact with the locking member, and the bottom side of the hook and the opening side are upward. A lower end of the locking surface extends below a contact portion of the locking member. 2. An outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and a member engaged with the protruding portion to suppress rotation of the inner hook. A rotating hook of the sewing machine, wherein the thread of the sewing machine passes through the contact portion with the locking member from one side of the protruding portion and crosses the hook with the bottom side of the hook down and the opening side up. An inclined portion is formed at the base of the one side of the protrusion at least upwardly or radially to guide the yarn moving along the base of the protrusion by rotation of the outer hook on which the yarn is hung. A rotary hook of a sewing machine, characterized in that: 3. An outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and a member engaged with the protruding portion to suppress rotation of the inner hook. A stop member, wherein the bottom side of the shuttle is down and the opening side is up, and the thread of the sewing machine passes through the contact portion with the locking member from one side of the protruding portion and crosses the hook, and the opening of the inner hook A rotary hook of a latch-type sewing machine having a claw piece for holding a bobbin over a predetermined portion of a portion thereof, wherein a height of an upper end of an outer peripheral portion of an inner hook is at least a part of the height extending in the one side direction from the protrusion. A rotary hook of a sewing machine, wherein the rotary hook is located above an upper end of the protruding portion in a range. 4. The height of the upper end of the outer peripheral portion of the inner hook is lower than the upper surface of the bobbin at any portion other than the partial range, at least in a state where the holding by the claw pieces is released from the bobbin. The rotary hook of the sewing machine according to claim 3, characterized in that: 5. The sewing machine according to claim 3, wherein a chamfer for exposing an outer periphery of an upper surface of the bobbin is formed at an upper end of an inner peripheral portion of the inner hook at least in a state where the holding by the claw pieces is released from the bobbin. Rotary pot. 6. An outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and a member engaged with the protruding portion to inhibit rotation of the inner hook. A stop member, wherein the bottom side of the shuttle is down and the opening side is up, and the thread of the sewing machine passes through the contact portion with the locking member from one side of the protruding portion and crosses the hook, and the opening of the inner hook A latch-type sewing machine rotary hook having a claw that holds a bobbin over a predetermined portion of a portion thereof, wherein the claw has a protrusion that pushes up a thread that moves on the claw by rotation of an outer hook. A rotary hook of a sewing machine, characterized by forming a. 7. An outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and a member engaged with the protruding portion to prevent rotation of the inner hook. A stop member, wherein the bottom side of the shuttle is down and the opening side is up, and the thread of the sewing machine passes through the contact portion with the locking member from one side of the protruding portion and crosses the hook, and the opening of the inner hook A latch-type sewing machine rotary hook having a claw that holds a bobbin over a predetermined portion of the portion, wherein the claw is spanned from a central portion of the inner hook to a side edge portion, as viewed from above, The angle between the straight line connecting the central portion of the inner pot and the protruding portion and the straight line connecting the center portion and the side edge portion of the inner pot over which the claw pieces are extended is directed from the protruding portion to the one side. A rotary hook of a sewing machine, wherein the rotary hook is provided in a range of 30 ° to 70 °. 8. An outer hook and an inner hook rotatably fitted to each other, a protruding portion radially protruding from an outer peripheral surface of the inner hook, and a member engaged with the protruding portion to suppress rotation of the inner hook. A stop member, wherein the thread of the sewing machine passes through the contact portion with the locking member from one side of the protruding portion and crosses the hook, and the inner hook is used for rotation of the outer hook. A rotary hook of a sewing machine, characterized in that the side where the thread passes from the side surface to the bottom side of the inner hook is inclined in a direction closer to the needle plate. 9. An outer hook and an inner hook rotatably fitted to each other, a projecting portion radially protruding from an outer peripheral surface of the inner hook, and a front-rear direction with respect to the projecting portion in a rotation direction of the outer hook. And a locking member for loosely engaging the locking member so as to pinch the inner thread of the sewing machine. A rotary hook of a horizontal sewing machine that passes through a hook and passes through a hook, wherein the protruding portion is arranged to be shifted in the same direction as the rotation direction of the outer hook.