JPH10165682A - Bobbin casing and looper thread bobbin in sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a cause for variation in tension of a looper thread in a bobbin casing and a looper thread bobbin in a sewing machine. SOLUTION: A looper thread Y is longitudinally taken out from a bobbin 7 and is led out through a thread tension adjusting spring 4 by a means for unrotatably holding the bobbin 7. The looper thread is led to the thread tension spring 4 through a guide cylinder 1a planted at the center of the bottom part of a body 1. A casing for unrotatably holding a bobbin 7 is composed of a magnet 8 provided to the bottom part of the body 1, and a bobbin fixing pin 9 projected from the bottom part of the body 1 and engaged in a hole of a flange part of the bobbin. The looper bobbin is formed in its flange part with a slit extending from a shaft hole to the edge. In a certain case, a thread guide groove for drawing the looper thread without making contact with a needle thread loop, is deeply formed obliquely so as to be extended from the outside of the bottom part in a direction opposite to the rotating direction of a rotating hook.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin case which is set in an inner hook of a lockstitch sewing machine and accommodates a lower thread bobbin, and a lower thread bobbin.

[0002]

2. Description of the Related Art Conventionally, as a bobbin case which is set in an inner hook of a hook of a lockstitch sewing machine, a needle is conventionally rotated counterclockwise when viewed from the front of the hook, and a needle is provided behind the inner hook stop portion and in front of the outer hook sword point. A falling type, a so-called DB type hook shown in FIG. 3, a type which rotates clockwise when viewed from the front of the hook, and a needle falls behind the needle point of the outer hook and forward of the needle guide provided on the back side of the outer hook, FIG. Type pots are known. Members having the same function in both types are denoted by the same reference numerals.

In these bobbin cases, an opening groove 21a extending obliquely to an edge is formed in a peripheral wall portion 21b of a main body 21 of the bobbin case.
Are formed. A thread tension adjusting spring 22, which has a thread guide portion 22a at its free end and can adjust the spring pressure with a screw 23, is provided on the outer periphery of the peripheral wall portion 21b of the main body 21. It is fixed so as to cover. Further, on the outer surface of the bottom portion 21c of the main body 21, there is provided a hooking piece 24 for hooking the main body 21 to a stud erected at the center of an inner hook (not shown).

In both types of hooks, a general lower thread bobbin 25 shown in FIG. 7 is inserted. For this, the lower thread Y is wound by a lower thread winding device (not shown) provided in the sewing machine. At this time, the bobbin 2
5 is wound several times around the shaft 25a.

When setting the bobbin case in the inner hook, first, the lower thread bobbin 25 around which the lower thread Y is wound is inserted into the bobbin case main body 21. Then, the winding end of the lower thread Y is guided to the lower surface of the thread tension adjusting spring 22 through the opening groove 21a,
It is pulled out through the yarn guide portion 22a in the direction of the arrow (upward because the one shown in each figure is a vertical shuttle). When the sewing operation is performed after the bobbin 25 is mounted on the shuttle, the lower thread Y is pulled out as the sewing progresses. At this time, the lower thread bobbin 25 rotates in the pull-out direction indicated by the arrow.

The bobbin case is provided with a bobbin thread Y
The "coreless winding yarn" wound in a donut shape with a special winding method without using a bobbin at all, without using a bobbin, is directly accommodated, and its lower thread Is drawn from the center of the pot.
And Japanese Utility Model Publication No. 44-20320. The method of taking out the yarn in the direction of the winding axis of the yarn in this way is called a vertical take-up method.

[0007]

The above-mentioned bobbin bobbin 2
3 and 7 which pulls out the lower thread Y while rotating 5, the tension taking into account the weight of the thread, the weight of the lower thread bobbin 25 and the clamping force of the thread tension adjusting spring 22 is applied to the lower thread Y. It takes
The weight of the thread differs greatly between when the thread is fully wound around the lower thread bobbin 25 and when the thread is almost gone. As a result, the bobbin thread tension when the thread is almost exhausted is about half that of a full thread. In addition, when the winding diameter decreases with a decrease in the amount of bobbin winding during sewing, the rotation angle of the bobbin bobbin 25 gradually increases even though the amount of bobbin pulled out is the same, and the bobbin bobbin 25 The coefficient of kinetic friction with the standing stud decreases, and the bobbin thread tension gradually decreases. Furthermore,
If the bobbin thread Y is pulled out rapidly during high-speed operation with the rotation of the shuttle at about 8000 rpm, or during thread trimming, the bobbin 25 rotates by inertia even after the pulling is stopped, and the bobbin thread Y is pulled out excessively. Causes slack in the bobbin case, causing tension fluctuation. In some cases, a kink between the slack yarns, that is, a state in which the shape is out of shape due to the twist is added, and in this case, the kink is caught by the thread tension adjusting spring 22 or the like, causing an extreme change in tension. Since a large or small change in the lower thread tension leads to a lowering or a rise in the knot position with the upper thread, the above-described change in the lower thread tension causes non-uniform stitches. In particular, in sewing shirts, the allowable range of variation in bobbin thread tension is extremely small, and the effect on the beauty of the seam is large. In some cases, a bobbin idling prevention spring is provided in the inner hook, but the spring force causes an increase in bobbin thread tension.

When the sewing proceeds and the amount of the bobbin thread Y wound around the bobbin bobbin 25 decreases, the start end of the bobbin thread 25 interferes with the bobbin thread being unwound, causing fluctuations in the bobbin thread tension. It may even be cut.

On the other hand, in the case where the above "coreless winding yarn" is directly accommodated and pulled out from the center of the hook, the lower thread tension does not change as shown in FIGS. (Entangled with the surrounding yarn). The bobbin thread is usually wound on the bobbin bobbin by a user with a bobbin attached to the sewing machine, but this "coreless bobbin" cannot be wound up and ordered by a special manufacturer. And it is not widely used because it increases the cost.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the cause of fluctuation of the lower thread tension in a bobbin case of a sewing machine and a lower thread bobbin.

[0011]

A bobbin case according to the present invention comprises a means for holding the bobbin 7 in a non-rotating state and a thread tension adjusting spring 4. The bobbin thread Y is taken vertically from the bobbin 7, and the thread tension adjusting spring is provided. It is withdrawn through 4.

Particularly, in the case of the DP type, the thread groove 1 "d for drawing out the lower thread Y so as not to contact the needle thread loop.
May be dug down obliquely from the front side of the bottom in the direction opposite to the rotation direction of the outer hook (FIG. 4).

A guide cylinder 1a is provided upright at the center of the bottom of the main body 1, and the lower thread Y taken vertically from the bobbin 7 is guided by the guide cylinder 1a.
Through the thread tension adjusting spring 4.

A means for holding the bobbin 7 in a non-rotating state is provided by a magnet 8 provided on the bottom of the main body 1 and a projecting means provided on the bottom of the main body 1.
And a bobbin fixing pin 9 that engages with a hole in the bobbin flange.

It has a peripheral wall portion held by a posture holding cylindrical portion 2 "f provided on the outer peripheral portion of the inner hook 2" to be set.

A notch 1 "f for removing the mounting bobbin may be formed in the peripheral wall (FIG. 8).

A groove 1 "c is formed in the peripheral wall to be engaged with the projection 2" a projecting from the attitude holding cylindrical portion 2 "f, and a flange of the attitude holding cylindrical portion 2" f is formed. The tip of the hook piece 3 "is aligned with the tip of the hook piece 3" in the opening 2 "b formed on the inside, and then pressed and turned in the direction opposite to the rotating direction of the outer hook, thereby making the hook piece 3"
Is engaged with a groove 2 "c adjacent to the opening 2" b of the inner hook 2 "and extending in the direction opposite to the rotating direction of the outer hook (FIG. 4).

A groove 1 "c is formed in the peripheral wall to be engaged with the convex portion 2" a protruding from the attitude holding cylindrical portion 2 "f, and a flange of the attitude holding cylindrical portion 2" f is formed. A slope 3 "f having the same direction as the slope 2" e inclined from the front side to the back side and the center side of the inner edge 2 "d may be formed at the tip of the hooking piece 3" (FIG. 5).

The lower thread bobbin of the present invention has a slit 7 "b extending from the hole of the shaft 7" a to the edge of the shaft 7 "a (FIG. 6).

A bobbin having a shaft portion and a flange provided at the ends of both shaft portions and having a thread wound around the shaft portion can be detachably housed through an opening that opens at least in one axial direction. A bobbin case for a sewing machine, comprising: a thread take-out portion for drawing out a bobbin thread in an opposite axial direction;

The thread take-out portion is disposed so as to face the shaft portion of the bobbin in the bobbin case in the axial direction.

When the thread at the time of sewing is fed, the bobbin is held in a non-rotating state, and the thread wound on the bobbin is pulled out along the outer periphery of one flange of the bobbin in the axial direction of the bobbin. A bobbin case of a sewing machine for guiding a thread outward from a thread take-out portion provided in the axial direction.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a bobbin case according to the present invention will be described with reference to FIG. The embodiment described here is an embodiment in which it is mounted on the DB type vertical hook, but the one mounted on a horizontal hook is basically the same.

This bobbin case has a bobbin case main body 1 having a bowl-like shape, and has a hole 7
c, a hollow guide tube portion 1a penetrating therethrough is formed. On the outer surface of the bottom 1c of the main body 1, a hooking piece 3 for hooking the bobbin case to the inner hook 2 to be set is provided. The hook 3 is provided with a thread tension adjusting spring 4 for applying tension to the lower thread. Further, the bobbin case main body 1 is provided with a removal lever 5 for removing the set bobbin case from the inner hook 2. In addition, 6 in FIG. 1 (1) is an outer hook, and FIG.
Is a bobbin around which the lower thread Y is wound.

In the center of the bottom of the bobbin case main body 1, a bobbin mounting guide tube portion 1a serving as a lower thread passage is integrally erected toward the opening side. Therefore, the hole 1b is formed in the bottom of the main body 1. At the bottom of the bobbin case main body 1, a magnet 8 for adsorbing and holding the bobbin 7 is buried, and engages with a small hole 7a formed in a flange of the bobbin 7 so as to engage the bobbin 7. A bobbin fixing pin 9 for stopping rotation is projected.

At one end of the hook piece 3, there is provided a claw 3a which is engaged with the inner hook 2 when the bobbin case is set.
The other end is provided with a stopper 3b that engages with the bobbin bottom 1c so as to regulate the protrusion limit of the claw 3a. The engaging piece 3 is slidably supported by a groove 1d formed on the outer surface of the bottom 1c of the bobbin case main body 1, and has a compression spring 10 provided between the bobbin case main body 1 and the compression spring 10.
Urged toward the claw portion 3a. The outer end of the claw 3a is an inclined portion. Therefore, when the bobbin case is pushed into the inner hook 2, the hook pieces 3 are pushed back by the corresponding portions of the inner hook 2, and can be returned by the force of the compression spring 10 when the pushing is completed. At that time, the claw portion 3a engages with the corresponding portion of the inner hook 2, and the setting is completed. The lower end of the claw portion 3a in FIG. 1 (2) is projected inward. The protruding portion 3e moves to the inside of the upper flange portion 7b of the bobbin 7 when the removal lever 5 to be described later is raised to retreat the claw portion 3a and release the engagement with the inner hook 2. . Therefore, when the bobbin case is removed, the bobbin 7 hung on the projection 3e is also removed.

The substantially L-shaped thread tension adjusting spring 4 has a screw 11
Is fixed at one end to the hooking piece 3. The clamping pressure of the thread tension adjusting spring 4, that is, the bobbin thread tension is controlled by the thread tension adjusting screw 1.
It can be adjusted while pulling out the yarn end depending on the degree of tightening of the hook 2 to the hook piece 3. A groove 3c for regulating the thread path is formed in the hooking piece 3 corresponding to the lower thread clamping position of the thread tension adjusting spring 4. The free end of the thread tension adjusting spring 4 is warped so that threading is easy (FIG. 1).
(2)).

The base end of the removal lever 5 is rotatably supported by the bobbin case main body 1 and extends toward the claw 3a through a hole 3d formed in the hooking piece 3. When the release lever 5 is raised, the back surface thereof is engaged with the edge of the hole 3d and pushed, so that the locking piece 3 is moved against the force of the compression spring 10 and the claw 3a is moved to the inner hook 2a. Withdraws from the hooked position. That is, the bobbin case can be removed from the inner hook 2. A chamfered portion 5a is formed at the position of the removal lever 5 facing the free end of the thread tension adjusting spring 4 so as to facilitate threading. That is, the warp of the free end of the thread tension adjusting spring 4 forms a clearance for threading.

In the bobbin case having such a structure, the removal lever 5 is pulled up to take out the bobbin case 1 from the inner hook 2, and the bobbin 7 wound with a certain amount of the lower thread Y is inserted into the guide tube portion 1a. At that time, the bobbin 7 is
Is attracted to the magnet 8, and the bobbin fixing pin 9 is engaged with the small hole 7a, so that the bobbin case body 1 is securely set in the non-rotating state. Then, the end of the lower thread Y passes between the inner peripheral surface of the main body 1 and the bobbin 7, is guided into the guide cylinder 1a along the flange of the bobbin 7, and is drawn out from the hole 1b.
Such a method of pulling out the yarn in the axial direction of the bobbin is referred to as “vertical take-up” as described above. Further, the thread end is guided to the groove 3c between the hook 3 and the thread tension adjusting spring 4. When the bobbin case in this state is pushed into the inner hook 2, the claw portion 3a of the latching piece 3 is pushed by the corresponding portion of the inner hook 2 and retreats, gets over the corresponding portion of the inner hook 2, and the compression spring 10 When returning by force, the setting is completed. In this state, a gap is formed between the bottom of the inner hook 2 and the flange of the inner shuttle 2 so that the yarn can sufficiently pass therethrough. Then, when the sewing operation is performed after the predetermined threading to another portion is completed, the lower thread Y is pulled out as the sewing progresses, but the bobbin 7 is held by the main body 1 in a non-rotating state. , The lower thread Y is pulled out vertically.
Therefore, there is no rotation.

The path of the lower thread Y in this embodiment is as described above. However, as shown in FIG. 2, the lower thread Y can also be taken vertically from the flange edge above the bobbin 7. In the second embodiment, the following changes are required. Note that members having the same functions as those in the above embodiment are represented by adding the same reference numerals with “′”.

The bottom 1c of the bobbin case main body 1 'is located on the completely opposite side to the previous embodiment, and is a leaf spring 13 for fixing the bobbin 7 in a non-rotating manner on the opposite side of the bottom 1c.
Is provided. At the opening of the main body 1 ', a latching piece 3' is supported by a fulcrum pin 14 so as to be able to open and close (swing).
As in the previous embodiment, the hook 3 'is provided with a claw 3'a for engaging with the inner hook, and the main body 1' is urged in the closing direction of the hook 3 '. The compression spring 10 'is built in. The hook 3 'is provided with a thread tension adjusting spring 4' having the same function as that of the previous embodiment and having a small hole 4'a at the free end. A slit 3 'for guiding the yarn extending to the position of the small hole 4'a is formed in the hooking piece 3'.
b is formed. In addition, the manner of supporting the bobbin 7 by the leaf spring 13 is the same as in the above embodiment.
The present invention can be implemented instead of using a magnet and a pin.
However, the leaf spring is installed at a position closer to the bottom 1c of the main body 1 '. Similarly, in the latter embodiment, a magnet and a pin may be employed.

In the latter embodiment, according to experiments, when the twist of the lower thread is strong, a kink is generated, so that the number of used yarns is limited, but it is possible to carry out sufficiently depending on the type of yarn. In the former embodiment, no twist-back occurs and no kink is likely to occur.

A third embodiment of the bobbin case of the present invention will be described with reference to FIG. What is described here is an embodiment in which the device is mounted on a DP type vertical hook.
The thing attached to a horizontal shuttle is basically the same. The third embodiment is basically the same as the first embodiment, but requires a change in the mounting position of the member and a change in 2 and 3 due to a difference in the rotation direction. Here, members having the same functions as those in the first embodiment are denoted by the same reference numerals with "" appended thereto, and only the changed points will be mainly described.

In this bobbin case, there is no bobbin case insertion shaft 26a in the conventional inner hook 26 shown in FIG. If there is a bobbin case insertion axis,
This is because the thread cannot be paid out. Instead, as shown in FIG. 8, in order to maintain the mounting posture of the bobbin case 1 "mounted on the inner pot 2", a cylindrical portion 2 "f which covers the peripheral wall of the bobbin case 1" is newly provided. I have. This is the same for the DB type shown in FIG.

In the peripheral wall portion of the main body 1 ", a convex portion 2" a protruding inside the peripheral side portion 2 "f of the inner hook 2" at the time of setting is provided.
A groove 1 "c having a relatively large margin in the circumferential direction is provided. The shape of the groove 1" c is as shown in FIG.
The convex portion 2 "a of the inner pot 2" and the groove 1 "c of the main body 1" are shown in FIG.
As shown in (2), two locations are provided at positions facing each other.

Further, as shown in FIG. 8, notches 1 "e are formed at opposing positions on the peripheral wall portion of the main body 1" which depart from the positions where the grooves 1 "c are formed. Without the notch 1 "e, the bobbin 7" inserted into the bobbin case 1 "is stuck to the magnet 8",
It is difficult to remove it because it is hidden by the outer periphery of the bobbin case. However, in the present invention, the bobbin 7 "except the notch 1" e is picked with two fingertips, and one of the flanges is hooked. Can be withdrawn.

As shown in FIG. 4, the main body 1 "is provided with a thread groove 1" d for guiding and pulling out the lower thread Y so as not to come into contact with the needle thread loop passing through the periphery of the shuttle. Have been. As shown in FIG. 4 (3), the yarn path groove 1 ″ d opens obliquely to the upper right from the left side of the hole 1 ″ b when viewed from the front, and furthermore, as shown in FIG. 4 (1). The inner part of the thread groove 1 "d is formed so as to be straight from the hole 1" b to the upper end. That is, the inner part of the thread groove 1 "d is formed by digging obliquely from the bottom front side in a direction opposite to the rotation direction of the outer hook.
The needle thread loop that is moved by being hooked on it moves from right to left. Therefore, the needle thread loop moves smoothly in the thread path groove 1 "d, and does not interfere with the lower thread Y.

At the tip of the hook 3 ", a projection 3" a is provided which bends from the front side to the back side and further projects outward. The inner hook 2 "is provided with an opening 2" b for receiving the projection 3 "a at the time of setting, and a groove 2" c adjacent to the opening 2 "b and extending in a direction opposite to the rotation of the outer hook (the direction of arrow A). The opening 2 ″ b and the groove 2 ″ c are formed by the convex 2 ″.
a is present on the radially opposite side to a.

The main body 1 "is set in the inner hook 2" by pushing the main body 1 "in such a manner that the projection 3" a of the hook 3 "is aligned with the opening 2" b of the inner hook 2 ". At this time, the hooking piece 3 "is pressed by the inner edge 2" d of the flange whose bent outer wall 3 "e is biased toward the center of the inner hook 2". Although it retreats, the state of being pressed by the restoring force of the compression spring 10 "is maintained.

The engagement between the locking piece 3 "and the inner hook 2" can be as shown in FIG. That is, the opening 2 "b shown in FIG. 4 (1) is not formed in the inner pot 2", and instead, the slope 3 inclined from the front side to the rear side and toward the center at the tip of the projection 3 "a. "F. And the projection 3 ″
The slope 3 ″ is also on the front side of the brim 2 ″ d of the inner pot 2 ″ facing a.
A slope 2 ″ e is formed in the same direction as f, and then a bend is formed on the back side. By doing so, when the main body 1 ″ is set on the inner pot 2 ″, FIG. ) 1
The locking piece 3 ″ at the position shown by the dashed line is pushed into the main body 1 ″ so that the slope 3 ″ f of the locking piece 3 ″
, Slides back against the spring force of the compression spring 10 ″, moves to the back side of the edge 2 ″ d of the inner hook 2 ″, and returns by the compression spring 10 ″.

Finally, with reference to FIG. 6, an embodiment of the lower thread bobbin 7 "suitable for these bobbin cases will be described.

This bobbin bobbin 7 "has a slit 7" b provided in a flange portion of a conventional bobbin bobbin. The slit 7 "b extends from the hole of the shaft 7" a of the flange to the edge.

The winding of the lower thread around the lower thread bobbin 7 "
This is done by the bobbin winding device attached to the sewing machine. First, an empty bobbin bobbin 7 "is mounted at a predetermined position of the bobbin winding device. Then, the yarn start end drawn out from the bobbin supply source is wound by hand around the shaft 7" a several times. Then, the start end of the lower thread is pulled out of the slit 7 "b. If the start end is pulled or held during the subsequent winding operation by the bobbin winding device, the lower thread start end portion becomes the slit 7". It is cut by the edge of b. Therefore, the start end of the lower thread does not exist outside the lower thread bobbin 7 "around which the lower thread is wound.

If the lower thread bobbin 7 "where the starting end of the lower thread is not exposed to the outside is set with the slit 7" b side facing the bottom side of the bobbin case main body 1 "and sewing is performed vertically, sewing proceeds. Even if the bobbin thread Y wound on the bobbin 7 "becomes small, its starting end does not interfere with the bobbin thread being unwound, so that the bobbin thread tension does not fluctuate, and the bobbin thread is cut in a locked state. Nor.

If the bobbin bobbin 7 "having the slit 7" b is set in the conventional bobbin case 21 shown in FIG. 3 or 7 and sewn, no problem occurs due to the exposure of the bobbin starting end. In particular, the slack portion caused by excessive withdrawal of the lower thread Y due to the inertial rotation of the bobbin during high-speed operation or thread cutting may be caught by the slit 7 "b and cut. Therefore, the lower thread bobbin 7 of the present invention. Is not suitable for the conventional bobbin case 21.

In the present invention, the lower thread comes into contact with the flange without the slit 7 "b and is taken up through the shaft 7" a. It does not break when in contact with 7 "b.

[0047]

Since the present invention is configured as described above, it has the following effects.

That is, since the tension is not affected by the bobbin bobbin and the amount of the wound yarn, the bobbin thread can be drawn out with a constant tension that is always adjusted. When the inclined groove for preventing contact with the needle thread is formed on the lower thread path, the lower thread can be guided to an optimum position. Therefore, a beautifully sewn seam with a uniform seam can be obtained. In addition, an existing lower bobbin can be used, and when a lower thread bobbin having a slit formed in a flange portion is used, there is no fluctuation in tension until the wound lower thread runs out, and there is no cutting. Also, since the bobbin does not rotate (slip) in any case,
It is no longer necessary to take countermeasures against slipping, such as the use of an aluminum bobbin and an iron bobbin, and the installation of a spinning prevention spring. Furthermore, by simply rotating or pressing the bobbin case, the bobbin case can be easily set on the inner hook. Also,
Since the inner wall is held by the cylindrical portion for holding the posture of the inner hook by the peripheral wall portion, the stability is not different from the conventional one. When the notch for removing the mounting bobbin is formed in the peripheral wall, the bobbin can be easily removed.

[Brief description of the drawings]

FIG. 1 relates to a DB type bobbin case of the present invention, in which (1) is a plan view of a shuttle with the bobbin case mounted, and (2) is a longitudinal sectional view showing a relationship between the bobbin case and the inner shuttle. is there.

FIG. 2 relates to another DB type bobbin case of the present invention, wherein (1) is a plan view and (2) is a partially broken side surface.

FIG. 3 is a diagram of a conventional DB type bobbin case;
(1) is a perspective view, and (2) is a side view.

FIG. 4 relates to a DP type bobbin case of the present invention, wherein (1) is a plan view of the shuttle with the bobbin case attached, (2) is a longitudinal sectional view showing the relationship between the bobbin case and the inner shuttle, (3) is a partial sectional view showing the state of the hole 1 "d.

FIG. 5 is a view for explaining an engagement state between a locking piece and an inner hook in a DP type bobbin case of the present invention, and (1).
Is a perspective view, and (2) is a longitudinal sectional view.

FIG. 6 is a perspective view of a DP type bobbin case and a lower thread bobbin of the present invention.

FIG. 7 is a perspective view of a conventional DP type bobbin case and a lower thread bobbin.

FIG. 8 is a perspective view of a DP type bobbin case and an inner shuttle of the present invention.

FIG. 7 is a perspective view of a conventional DP type inner pot.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bobbin case main body 1a guide cylinder portion 2 inner hook 3 hook piece 4 thread tension adjusting spring 5 removal bar 7 bobbin 8 magnet 9 bobbin fixing pin 1 "bobbin case main body 1" c groove 1 "d thread path groove 1" e notch Part 2 "Inner hook 2" a Convex part 2 "b Opening 2" c Groove 2 "d Edge 2" e Slope 2 "f Posture holding cylindrical part 3" Latch 3 "f Slope 4" Thread tension adjustment Spring 5 "Removal bar 7" Bobbin 7 "b Slit 8" Magnet 9 "Bobbin fixing pin Y Lower thread

[Procedure amendment]

[Submission date] July 24, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 relates to a DB type bobbin case of the present invention, in which (1) is a plan view of a shuttle with the bobbin case mounted, and (2) is a longitudinal sectional view showing a relationship between the bobbin case and the inner shuttle. is there.

FIG. 2 relates to another DB type bobbin case of the present invention, wherein (1) is a plan view and (2) is a partially broken side surface.

FIG. 3 is a diagram of a conventional DB type bobbin case;
(1) is a perspective view, and (2) is a side view.

FIG. 4 relates to a DP type bobbin case of the present invention, wherein (1) is a plan view of the shuttle with the bobbin case attached, (2) is a longitudinal sectional view showing the relationship between the bobbin case and the inner shuttle, (3) is a partial sectional view showing the state of the hole 1 "d.

FIG. 5 is a view for explaining an engagement state between a locking piece and an inner hook in a DP type bobbin case of the present invention, and (1).
Is a perspective view, and (2) is a longitudinal sectional view.

FIG. 6 is a perspective view of a DP type bobbin case and a lower thread bobbin of the present invention.

FIG. 7 is a perspective view of a conventional DP type bobbin case and a lower thread bobbin.

FIG. 8 is a perspective view of a DP type bobbin case and an inner shuttle of the present invention.

FIG. 9 is a perspective view of a conventional DP type inner pot.

[Description of Signs] 1 bobbin case main body 1a guide cylinder 2 inner hook 3 hook piece 4 thread tension adjusting spring 5 removal bar 7 bobbin 8 magnet 9 bobbin fixing pin 1 "bobbin case main body 1" c groove 1 "d thread path Groove 1 "e Notch 2" Inner hook 2 "a Convex 2" b Opening 2 "c Groove 2" d Edge 2 "e Slope 2" f Posture holding cylindrical part 3 "Hook 3" f Slope 4 ”thread tension adjusting spring 5” removal bar 7 ”bobbin 7” b slit 8 ”magnet 9” bobbin fixing pin Y bobbin thread

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Wakabayashi 1-Juki Co., Ltd., 8-2-2 Kokuryo-cho, Chofu-shi, Tokyo (72) Inventor Masio Takami 2--10, Sanmeicho, Abeno-ku, Osaka-shi, Osaka No. 32 Inside Hirose Manufacturing Co., Ltd.

Claims (12)

[Claims] 1. A bobbin case for a sewing machine, comprising: means for holding a bobbin in a non-rotating state; and a thread tension adjusting spring, wherein a lower thread is taken up from the bobbin and pulled out through the thread tension adjusting spring. 2. The bobbin of a sewing machine according to claim 1, wherein a thread groove for pulling out the lower thread so as not to contact the needle thread loop is formed by obliquely digging from the front side of the bottom in a direction opposite to the rotation direction of the outer hook. Case. 3. A guide tube portion is provided upright at the center of the bottom of the main body.
The bobbin case for a sewing machine according to claim 1 or 2, wherein the lower thread taken up from the bobbin is guided to the thread tension adjusting spring through the guide tube portion. 4. The means for holding the bobbin in a non-rotating manner comprises a magnet provided on the bottom of the main body and a bobbin fixing pin projecting from the bottom of the main body and engaging with a hole in the bobbin flange. The bobbin case of the sewing machine according to claim 3. 5. The bobbin case according to claim 1, further comprising a peripheral wall portion held by a posture holding cylindrical portion provided on an outer peripheral portion of the inner hook. 6. The bobbin case according to claim 5, wherein a notch portion for removing the mounting bobbin is formed in the peripheral wall portion. 7. A groove is formed in the peripheral wall portion for engaging with a convex portion protruding from the posture holding cylindrical portion, and a hook piece is provided in an opening formed inside a flange of the posture holding cylindrical portion. 7. The end of the hooking piece is engaged with a groove adjacent to the opening and extending in a direction opposite to the rotating direction of the outer hook, by aligning and pushing the leading ends and then rotating the locking piece in the direction opposite to the rotating direction of the outer shuttle. The bobbin case of the sewing machine described in 1. 8. A groove is formed in the peripheral wall portion for engaging with a convex portion protruding from the cylindrical portion for holding the posture, and the groove is formed from the front side to the rear side and the center side of the inner edge of the flange of the cylindrical portion for holding the posture. 7. A slanted surface having the same direction as the slanted slope is formed at the tip of the hook.
The bobbin case of the sewing machine described in 1. 9. A lower thread bobbin having a flange formed with a slit extending from a shaft hole to an edge. 10. A bobbin having a shaft portion and a flange provided at ends of both shaft portions, wherein a bobbin wound with a thread around the shaft portion can be removably housed through an opening opening at least in one axial direction. A bobbin case for a sewing machine, comprising: a thread take-out section for drawing out a bobbin thread in an axial direction opposite to the section; 11. The bobbin case of a sewing machine according to claim 10, wherein the thread take-out portion is disposed axially opposite to a shaft portion of the bobbin in the bobbin case. 12. When the thread at the time of sewing is fed, the bobbin is held non-rotating, and the thread wound on the bobbin is pulled out along the outer periphery of one flange of the bobbin in the axial direction of the bobbin.
A bobbin case for a sewing machine for guiding the drawn yarn outward from a yarn take-out portion provided in the axial direction.