JPH10113485A - Vertically full rotating shuttle of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachable vertically full rotating shuttle of a sewing machine by attaching an inner shuttle equipped with a ball race part to an outer shuttle to reduce vibration caused by rotating of the outer shuttle. SOLUTION: A vertically full rotating shuttle 10 of a sewing machine is composed of an inner shuttle 2, an outer shuttle rotating around the rotating axis and a presser 3 bonded to the outer shuttle 1 to hold the inner shuttle. This shuttle has a ball race part 6 installed on the perimeter of the inner shuttle 2 and a groove 7 for the ball race at a joint part of the outer shuttle 1 to the presser 3 for the inner shuttle. The presser is placed on one side C1 and on the other side of the inner perimeter of the outer shuttle 1. The joint of the outer shuttle 1 to the presser 3 is formed and placed at a position where is near to the bottom of the outer shuttle 1 away from the vicinity of the center of the direction line of the rotating axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical full rotation sewing machine used in, for example, lockstitch sewing machines.

[0002]

2. Description of the Related Art FIG. 10 is a side view showing a vertical full rotation hook of a conventional general sewing machine. FIG. 11 is a partial cross-sectional view showing a conventional vertical full rotation kettle having a refueling mechanism.
As shown in FIGS. 10 and 11, the general vertical rotation of the sewing machine includes an outer hook P1, an inner hook P2, and an inner hook holder P.
3, a thread guide spring P4, an outer bite set screw P10, an inner bite tightening screw P11, and a thread guide spring tightening screw P12. Further, the one having the refueling mechanism is provided with a refueling passage P9 shown in FIG.

[0003] On the outer peripheral surface of the inner hook P2, an inner hook race portion P6 is provided substantially near the center in the rotation axis direction, and correspondingly, an outer hook race groove P7 is provided on the inner peripheral surface of the outer hook P1. Have been. Then, the inner hook race part P6 is fitted into the outer hook race groove P7, and the inner hook P2 is inserted into the outer hook P1.
Is loosely held. The inner pin race portion P6 is generally provided near the center of the inner pin P2 in the direction of the rotation axis, and the width thereof is often about 1.6 mm.

Further, as shown in FIGS. 11 and 12, an outer hook race groove P7 formed in the outer hook P1 is formed so that at least half of its circumference is open on the side of the groove (the side is open). The side J is divided into a side J and a side C that is not opened.), And the inner pincer P3 forms the side of this groove. Inner bite P
When assembling 2 into the outer hook P1, first, insert the half circumference of the inner hook race P6 into the unopened side C of the outer hook race groove P7, and turn the inner hook race P6 around the inserted portion. Then, the remaining portion of the inner race portion P6 is inserted into the open side J of the outer race race groove P7.
Then, the inner hook retainer P3 is screwed to the outer hook P1.

[0005]

However, in the conventional vertical full-rotation kettle described above, the width of the inner bite race portion P6 is 1..
As shown in FIG. 12, the outer race P1 has an outer race race groove P7 and the inner race P2 has an inner race race portion P6.
Because the area receiving the backlash A1 is small, the fall of the inner furnace P2 is likely to occur, and this fall amplifies the vibration of the inner furnace P2 accompanying the rotation of the outer furnace P1, and is not installed in the inner furnace 2 The bobbin case and the bobbin, and the tension of the bobbin thread wound on the bobbin during sewing becomes unstable.

In order to solve the above problem, the width of the inner pin race portion and the width of the outer pin race groove may be increased to increase the area for receiving the backlash A1.
In the structure for assembling the outer hook P1 with the outer hook P1, there are the following problems. That is, when the inner hook race part P6 is rotated and inserted into the open side J of the outer hook race groove P7, if the width of the inner hook race part P6 is large, the corner of the inner hook race part P6 is formed. Q cannot be inserted because it is caught in front of the outer hook race groove P7. In order to insert, if the diameter of the inner pin race (the diameter centering on the axis of rotation of the pot) is reduced,
Backlash A1 between outer bite race groove P7 and inner bite race part P6
Becomes large, and the vibration of the inner hook P2 accompanying the rotation of the outer hook P1 is amplified.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. In order to reduce the vibration of the inner hook caused by the rotation of the outer hook, the inner hook having a wide inner hook race portion is provided with a play. An object of the present invention is to provide a vertical full rotary hook of a sewing machine which can be assembled to an outer hook without increasing the size.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that an inner hook, an outer hook rotating about a rotation axis, and an inner hook supported by the outer hook. In a vertical full rotation kettle of a sewing machine provided with an inner hook, a lace portion provided on an outer peripheral portion of the inner hook and an inner peripheral portion of the outer hook are provided on one side of an inner peripheral portion of the outer hook. A race groove provided in a support portion of the outer bite and the inner bite presser, and a joint between the outer bite and the inner bite presser is substantially out of the center of the race groove in the rotation axis direction. The configuration is such that the lace portion is loosely fitted in the race groove and is held at the inner hook from the bottom of the kettle.

According to the first aspect of the present invention, when assembling the inner hook to the outer hook, first, one side of the lace portion is inserted into the side where only the outer hook has a race groove, and the insertion is performed. The inner hook is rotated about the portion thus formed, and the remaining portion of the inner hook race is inserted into the side where the race groove is formed at the joint with the inner hook retainer. Then, the inner bite retainer is joined to the outer bite, for example, by screwing, and the race portion of the inner bite is loosely fitted and held in a race groove provided in the outer bite and the inner bite. In the conventional structure, when rotating the inner hook and inserting the lace portion of the inner hook into the race groove of the outer hook, if the lace portion is widened, the corners of the lace portion are caught by the outer hook. On the other hand, in the present invention, since the joint between the outer bite and the inner bite holder is formed so as to be located substantially from the center of the race groove to the bottom of the hook,
Regardless of the width of the lace portion, the hook of the lace portion is avoided, and the inner hook can be inserted into and pulled out of the outer hook without increasing the play of the race groove and the lace portion. Therefore, it is possible to make the race part wider.

According to a second aspect of the present invention, there is provided the sewing machine according to the first aspect, wherein the race portion is 2.4.
mm to 4.0 mm.

[0011] According to the second aspect of the present invention, the wide lace portion increases the area of the race groove and the lash portion that receives the backlash, thereby reducing the fall of the inner hook and thereby rotating the outer hook. The vibration of the inner bite that occurs inside is reduced,
The bobbin thread tension stabilizes.

According to a third aspect of the present invention, in the vertical full rotation kettle of the first or second aspect of the invention, the race portion is provided substantially at the center of the outer periphery of the inner hook in the direction of the rotation axis. And

According to the third aspect of the present invention,
Because the race is located near the center of the inner kettle, the inner kettle is supported on a plane that passes through the center of gravity of the inner kettle. Vibration (displacement) on the side to which the yarn is supplied is reduced, and the lower thread tension is stabilized, as compared with the one located at the bottom of the inner hook.

According to a fourth aspect of the present invention, there is provided a sewing machine according to any one of the first to third aspects, wherein
When the bottom of the outer hook is turned downward, the upper side of the inner hook retainer is located rearward in the rotation direction of the outer hook from a portion where the upper thread passes when the yarn take-out amount of the hook reaches the maximum. With the point as the apex, a configuration is provided in which a gradient descending in the rotation direction of the outer kettle is provided.

According to the fourth aspect of the present invention, when the upper thread of the sewing machine crosses the vertical rotary hook, the thread that crosses the bottom of the rotary hook is attached to the upper surface of the inner hook retainer with the rotation of the outer rotary hook. Will move relative to each other. During this relative movement, the yarn extends from the bottom of the kettle and refracts at the corner of the top of the inner hook retainer,
The inner hook retainer extends along the upper surface to the sewing position. When the thickness of the inner bite retainer is made constant by the width of the race portion of the inner bite being formed wider from the center, the upper surface of the inner bite becomes higher. Is provided, the height of the upper surface portion is reduced in the range where the yarn take-up amount of the stove is substantially maximum, and the yarn take-up amount of the stove is suppressed to be low. In addition, since the height of the upper surface is reduced in the above range, the refraction resistance of the upper thread (the resistance of the bent portion of the upper thread) over the upper portion of the inner pincer decreases, and the tension fluctuation of the upper thread decreases. And a stable sewing quality can be realized.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. First, the directions used in the description of this embodiment will be defined. In the description of this embodiment,
“Top” and “bottom” mean the top and bottom when the bottom of the furnace 10 is turned downward, and “high” and “low” mean the height along the rotation axis of the outer furnace 1 with respect to the bottom of the furnace 10. For example, a front end portion 6a and a rear end portion 6b of an inner hook race portion 6 described later.
"Front (front)" and "rear" used at the front end and rear end of the outer hook retainer 3 and the thread guide spring 4 are oriented in the rotation direction of the outer hook 1 along the circumferential direction of the hook 10. Represents before (before) after time. FIG. 1 is a partial cross-sectional view of a vertical full rotation hook 10 of a sewing machine showing an example of an embodiment of the present invention, viewed from the side.
Is a perspective view of the inner hook for explaining the shape of the inner hook race on the thread pull-out side and the transfer of the upper thread, FIG. 3 is a side view showing the shape of the inner hook race on the thread splitting side, and FIG. Partial enlarged view showing the alignment position of the hook race groove and the inner hook holding race groove,
FIG. 5 is a front view of the kettle, and FIG. 6 is a partially enlarged view of the kettle as viewed from the direction of arrow U in FIG.

[0017] The vertical full rotation kettle 10 of this embodiment is composed of:
Up to full vertical rotation for a lockstitch sewing machine that can rotate at high speed without the need for refueling.
It is composed of an inner hook presser 3 and a thread guide spring 4. The inner hook 3 and the thread guide spring 4 are screwed to the outer hook 1. An inner bite lace (rail) portion 6 is provided on the outer peripheral surface of the inner bite 2, and a race groove 7 is provided on the inner peripheral surface of the outer bite 1 and the inner bite holder 3. The inner hook 2 has the inner hook race portion 6 fitted into the race groove 7 and is loosely fitted and held on the outer hook 1.

The inner race portion 6 is made of industrial plastic so as to eliminate the need for lubrication.
In order to receive the backlash in a wide area, it is formed wide. The width W is 1.5 to 2.5 times that of the conventional one (generally, about 1.6 mm and shown by a two-dot chain line in the drawing), that is, about 2.4 mm to 4.0 mm. is there. When the width is 2.4 mm or less, the ratio of the width of the race portion to the play of the race groove 7 and the race portion 6 increases,
Vibration caused by rotation of the shuttle is transmitted to the bobbin, the bobbin idles, and the bobbin thread is entangled in the bobbin case, causing thread breakage. Further, when the width is 4.0 mm or more, the distance from the bottom of the shuttle to the inclined surface B is inevitably increased, whereby
Since the thread take-up curve of the shuttle changes, the thread tightening also changes, and there is a drawback that it is not possible to cope with thread tightening when sewing a thin cloth. For this reason, the race width is set in the above range. The inner pin race part 6 is provided substantially at the center in the direction of the rotation axis of the pin 10 and has a width almost uniformly increased in both directions from near the center as compared with a conventional thin one.

As shown in FIG. 2, a radius is formed at a lace threading portion (tip portion) 6a of the inner hook race portion 6 with a radius substantially equal to a half of the width W of the inner hook race portion 6. . As compared with the conventional thin inner hook race portion shown by a two-dot chain line in the drawing, the radius is increased by the width of the inner hook race portion 6 being wider.

As shown in FIG. 3, the lace thread dividing portion (rear end portion) 6b of the inner kama lace portion 6 has an apex which divides the upper thread into a bottom side and an upper side of the middle kama 2 and has a vertex. A radius is formed at the vertex (particularly, from the vertex to the bottom of the inner kettle 2). Compared with the conventional thin inner hook race shown by the two-dot chain line in the figure, a large radius is formed without changing the position of the apex.

As shown in FIG. 4, a part of the race groove 7 on the side of the yarn guide spring 4 is formed only in the outer hook 1, and a portion of the race groove 7 which is more than half the circumference facing the yarn guide spring 4 is provided between the outer hook 1 and the inner hook 1. It is formed over the presser 3. The portion formed on the outer bite 1 side is referred to as an outer bite race groove 1a, and the portion formed on the inner bite holder 3 side is referred to as an inner bite race groove 3a. For details,
In the portion where the inner hook 3 is located, one side wall of the race groove 7 is formed by the outer hook 1, the other side wall is formed by the inner hook 3, and the bottom of the race groove 7 is formed by the outer hook 1 and the inner hook 1. It is configured over the hook holder 3. Outer bite 1
The alignment position M1 of the outer bite race groove 1a and the inner bite holder race groove 3a of the inner bite holder 3 is located substantially at the center of the race groove 7.

As shown in FIG. 6, the upper surface E of
On the rear side of the point G is higher than the conventional upper surface indicated by the two-dot chain line in the figure. The elevation of the upper surface E is caused by the width of the inner race portion 6 having been increased upward. The upper surface E of the inner pin holder 3 is formed with a sloping surface B gently descending from the point G to the top with the point G as the apex. Point G is a point at which the yarn take-up amount of the kneader 10 exceeds the maximum and the yarn tension decreases. Due to the inclined surface B, the height of the upper surface E of the inner hook retainer 3 is adjusted to the rear end 4a of the thread guide spring 4.
It is designed to be continuously connected to the height. Further, the height of the upper surface E of the inner hook retainer 3 and the height of the rear end 4a of the thread guide spring 4 are formed in a range H at substantially the same height as that of the conventional shuttle. The range H is the furnace 1
When the thread take-up amount of 0 is almost maximum, the upper thread passing over the outer hook 1 passes through.

The vertical rotation of the sewing machine 10 of this embodiment has the following effects by the above-described configuration. That is, as shown in FIG. 7 which is an explanatory view of the play A2 between the inner race portion 6 and the race groove 7, the inner race portion 6 is wider (1.5 times to 2.5 times) than the conventional one.
The races 7 of the outer kettle 1 and the inner kettle 2
The area that receives the rattle A2 of the inner race is increased,
The fall of the inner kettle 2 is reduced, so that the vibration of the inner kettle 2 generated during the rotation of the outer kettle 1 is reduced.

Further, as shown in FIG. 1, since the inner hook race portion 6 is located near the center of the inner hook 2, the inner hook 2 is supported at substantially the same height as the position of the center of gravity of the inner hook 2. As a result, the vibration of the inner furnace 2 is reduced. Further, as compared with the case where the inner hook race portion 6 is located below the bottom of the inner hook 2, vibration (displacement) on the side where the yarn is supplied (F side in the figure) is reduced, and the lower thread tension is stabilized. I do.

As shown in FIG. 2, since the curvature of the lace thread pull-out portion (tip portion) 6a of the inner bite lace portion 6 becomes gentle, the lace thread pull-out portion of the inner bite lace portion 6 during sewing. Ironing of the upper thread in contact with the upper thread 6a (twisting movement of the upper thread when passing over the hook) is reduced, looping and thread breakage are reduced, and a stable seam can be formed.

As shown in FIG. 3, since the curvature of the lace thread splitting portion (rear end portion) 6b of the inner hook lace portion 6 is reduced, the lace yarn splitting of the inner hook lace portion 6 is performed during sewing. Ironing of the upper thread in contact with the portion 6b (twisting movement of the upper thread when passing over the hook) is reduced, looping and thread breakage are reduced, and a stable stitch can be formed. Also, since the position of the apex of the lace thread dividing portion 6b is the same as the conventional one, the sword of the outer hook 1 and the thread arrangement of the thread guide spring 4 for dividing the upper thread into the bottom side and the upper side of the hook are different from those of the conventional one. You can do the same. As a result, the yarn take-up amount of the kettle 10 becomes the same as before, and it is not necessary to readjust the movement of the balance.

When assembling the inner hook 2 to the outer hook 1,
First, the semicircular side of the inner hook race portion 6 is inserted into a portion C1 (FIG. 1) in which only the outer hook 1 has the race groove 7 formed therein.
The inner hook 2 is rotated around the inserted portion, and the remaining portion of the inner hook race 6 is inserted into the outer hook 1.

As shown in FIGS. 4 and 7, the alignment position M between the outer race race groove 1a and the inner race race groove 3a is determined.
1 is located substantially at the center of the race groove 7, so that when the inner hook 2 is rotated and inserted into the outer hook 1, the corner D of the inner hook race portion 6 is caught by the outer hook 1. That is, good insertion and withdrawal properties (insertion / extraction properties) are ensured without increasing the play between the outer kettle 1 and the inner kettle 2.

During sewing, the upper thread crossing the bottom side of the hook 10 moves along the thread guide spring 4 (actually, the outer hook 1).
Is rotating and moving. After that, in the range H where the yarn take-up amount of the knitting machine 10 is almost maximum, the knitting machine 10 extends from the thread guide spring 4 to the inclined surface B of the upper surface E of the inner kama presser 3 and before the upper thread reaches the point G. The thread take-up amount exceeds the maximum,
The thread tension is reduced.

FIG. 8 shows that the upper thread passing over the bottom of the kettle 10 is
FIG. 4 is a partial cross-sectional view illustrating a state in which the movable member moves along an upper surface E of the inner hook retainer 3 in a range H. FIG. As shown in FIG. 6, as the width of the inner bite race portion 6 increases, the inner bite retainer 3
The upper surface E of the upper thread S is raised, and the refraction resistance of the upper thread S (the refraction portion S of the upper thread S that moves along the E surface during sewing as it is)
1; see FIG. 8).
Is higher than the point G where the tension of the upper thread S becomes lower, so that there is no effect on the transfer of the upper thread and the thread take-up amount.

Further, as shown in FIG. 6, an inclined surface B is formed on the upper surface E of the inner hook presser 3 so as to gently fall on the tip with the point G as the apex, so that the yarn take-up amount of the hook 10 is almost maximum. In the range H, the height of the upper surface E is reduced, so that the yarn feeding at the time of the transfer of the upper thread of the inner pincer 3 can be minimized. In the above range H, the inner hook presser 3
The refraction resistance of the upper thread S (the resistance of the refraction portion S1 of the upper thread S) passing along the upper surface E of the upper thread E decreases, the fluctuation in the tension of the upper thread decreases, and stable sewing quality is obtained.

Further, with the above-mentioned gentle slope B,
The height of the upper surface E of the inner hook retainer 3 and the rear end 4 of the thread guide spring 4
a, the upper thread is not caught at the node between the thread guide spring 4 and the inner hook presser 3, and the upper thread is transferred from the thread guide spring 4 to the upper surface E of the inner hook presser 3.
It can be moved smoothly. In other words, the yarn passing through the shuttle becomes smooth.

In the range H, the heights of the thread guide spring 4 and the upper surface E of the inner hook presser 3 are adjusted to substantially the same height as in the prior art, so that the yarn take-up amount of the hook 10 is substantially the same as in the prior art. Thus, there is no need to readjust the balance movement.

As described above, according to the vertical full rotation kettle 10 of the sewing machine of this embodiment,
The following effects (1) to (6) are obtained.

(1) The fall of the inner hook 2 and the vibration of the inner hook 2 can be reduced, and the lower thread tension during sewing can be stabilized.
The sewing quality is improved, and the noise generated from the hook 10 during sewing is also reduced. (2) The front end 6a and the rear end 6b of the inner hook race 6
Can be moderated, ironing of the upper thread during sewing is reduced, looping and thread breakage are reduced, and stable sewing quality with low tension can be provided.

(3) The insertability of the inner furnace 2 is improved without increasing the play of the outer furnace 1 and the inner furnace 2 in the radial direction and the rotation axis direction, and the replacement workability of the inner furnace 2 at the user level is also improved. Thus, running costs can be reduced. (4) By forming the front end side of the upper surface E of the inner pincer 3 with a gentle slope B, the yarn feeding of the inner pincer 3 at the time of thread transfer can be minimized, and the upper thread at the time of thread transfer can be reduced. Stitch stabilization can be measured by reducing tension fluctuation.

(5) An inexpensive kettle having good sewing quality can be provided without largely changing the conventional kettle manufacturing process. (6) Since the thread feeding amount and the thread tension of the hook 10 can be made substantially the same as those of the conventional machine, a hook of good sewing quality can be applied without changing the configuration of the sewing machine other than the hook such as movement of the balance. Can be done.

It should be noted that the present invention is not limited to the vertical full rotation kettle 10 of the sewing machine according to this embodiment, and can be appropriately changed without departing from the spirit of the invention. For example,
The position at which the outer race race groove 1a and the inner race race groove 3a are aligned is not limited to substantially the center of the race groove 7, but the same effect can be obtained if the race groove is located at the bottom side from the center.

FIG. 9 is a cross-sectional view showing another example of the position where the outer race race groove and the inner race race groove are aligned as another embodiment of the present invention. As shown in the drawing, one side wall of the race groove 7A is formed by the outer hook 1A, the other side wall is formed by the inner hook 3A, and the bottom surface of the race groove 7A is formed only by the inner hook 3A. In other words, the alignment position M of the outer hook 1A and the inner hook holder 3A
Even if 2 is the lower end of the race groove 7A, the insertability of the inner hook is good.

[0040]

According to the first aspect of the present invention, regardless of the width of the race portion, the inner hook can be satisfactorily formed without increasing the play of the outer hook 1 and the inner hook 2 in the radial direction and the rotation axis direction. It can be assembled to an outside kettle. That is, the workability of replacing the inner kettle at the user level is good, and the running cost can be suppressed.

According to the second aspect of the present invention, the wide lace portion increases the play area between the race groove and the lace portion, thereby reducing the fall of the inner hook and thereby reducing the rotation of the outer hook. The vibration of the inner pinch generated in the step is reduced, and the lower thread tension is stabilized.

According to the third aspect of the invention, in particular, since the lace portion is provided near the center of the inner hook, the inner hook is supported on a plane passing through the center of gravity of the inner hook.
Further, the vibration of the inner hook can be reduced, and the lower thread tension can be stabilized. In addition, noise generated from the kettle during sewing is also reduced.

According to the fourth aspect of the present invention, if the thickness of the inner hook retainer is made constant because the inner hook race is formed wider from the center, the upper surface of the inner hook hold becomes higher. Since the above-described gradient is provided on the upper surface of the inner hook presser, the height of the upper surface is reduced in a range where the yarn take-up amount of the kama is almost maximum, and the yarn take-up amount of the kama is suppressed to be low. Can be In addition, since the height of the upper part is reduced in the above range, the refraction resistance of the upper thread over the upper part of the inner stitch is reduced, the tension fluctuation of the upper thread is reduced, and stable sewing quality is realized. it can.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a vertical full rotation hook of a sewing machine as viewed from a side, showing an example of an embodiment of the present invention.

FIG. 2 is a perspective view of the inner hook for explaining the shape of the inner hook race portion on the thread pull-out side and the transfer of the upper thread in the vertical full-rotation hook;

FIG. 3 is a side view of the inner hook showing a shape of a thread splitting side of an inner hook race portion in the vertical full rotation kettle.

FIG. 4 is a partially enlarged view showing a matching position of an outer bite race groove and an inner bite holding race groove in the vertical full-turn rotary hook.

FIG. 5 is a front view of the vertical full-rotation kettle.

FIG. 6 is a partially enlarged view of the vertical full rotation kettle as viewed from the direction of arrow U in FIG. 5;

FIG. 7 is an enlarged cross-sectional view showing a play between an inner bite race portion and a race groove in the vertical full rotation bite.

FIG. 8 is a partial cross-sectional view showing a state in which the upper thread crossing the bottom side of the kettle moves along the upper surface of the inner kettle in the vertical full rotation kettle.

FIG. 9 is an enlarged cross-sectional view showing another example of the position where the outer race race groove and the inner race race groove are aligned as another embodiment of the present invention.

FIG. 10 is a side view showing a vertical full rotation hook of a conventional general sewing machine.

FIG. 11 is a partial cross-sectional view showing a conventional vertical full rotation kettle having a refueling mechanism.

FIG. 12 is an enlarged cross-sectional view showing a play between an inner bite race portion and a race groove in a conventional general full vertical rotary bite.

[Explanation of symbols]

1, 1A Outer bite 1a Outer bite race groove 2 Inner bite 3, 3A Inner bite holder 3a Inner bite race groove 4 Thread guide spring 6 Inner bite race part 7, 7A Race groove B Inner inclined surface E of inner bite Upper surface of the bite clamp M1, M2 Position of the outer and inner bite clamps in the race groove (seam)

Claims (4)

[Claims] 1. A vertical full rotation sewing machine comprising: an inner hook; an outer hook rotating about a rotation axis; and an inner hook retainer supported by the outer hook to hold the inner hook. A lace portion provided on the outer peripheral portion, and provided on one side of the inner peripheral portion of the outer hook, and on the other side of the inner peripheral portion of the outer hook, provided on a support portion for the outer hook and the inner hook retainer. A seam between the outer hook and the inner hook holder is located from a substantially center of the race groove to a bottom of the hook of the outer hook along the rotation axis direction, and the race portion is provided in the race groove. Characterized in that the inner hook is held by loosely fitting the inner hook. 2. The lace part is 2.4 mm to 4.0 mm.
The vertical full rotation kettle of the sewing machine according to claim 1, characterized in that the width is formed. 3. The vertical whole sewing machine according to claim 1, wherein the width of the lace portion is formed to be uniform with respect to a center line along a circumferential direction of the lace portion. Rotating bite. 4. The rotating direction of the outer hook from the portion where the upper thread crosses when the thread take-out amount of the hook exceeds the maximum when the bottom of the inner hook is turned downward when the bottom of the outer hook is turned downward. 4. A vertical full rotation sewing machine according to any one of claims 1 to 3, characterized in that a gradient is provided, with a point at the rear toward the top as a vertex, descending in the direction of rotation of the outer hook. .