JP2726246B2 - Vertical full rotation and inner bite - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a vertical full rotation kettle provided on a sewing machine.

[0002]

2. Description of the Prior Art FIG. 7 is a cross-sectional view showing a typical prior art vertical full rotation kettle 1. As shown in FIG. For example, a vertical full rotary hook 1 provided in an industrial sewing machine is reciprocated up and down, and an outer rotary hook 6 driven to rotate around a rotation axis 5 perpendicular to a movement path 4 of a needle 3 through which a needle thread 2 is inserted. The bobbin case 8 includes an inner hook 7 housed in the outer hook 6 and a bobbin case 8 detachably mounted on the inner hook 7. A bobbin (not shown) around which bobbin thread is wound is housed in the bobbin case 8. ing.

[0003] In the flange 9 on the open end side of the inner kettle 7, a bite recess 10 is formed. The bite recess 10 has a detent member 11 whose base end is fixed to the body of a sewing machine (not shown). Is fitted. The outer hook 6 has a blade point 13 for catching the needle thread 2 inserted through the needle 3, and a track groove 14 is formed in the inner peripheral portion. A rail 15 that fits into the rail groove 14 is formed on an outer peripheral portion of the inner furnace 7, and the inner furnace 7 is supported by the outer furnace 6 with the rail 15 fitted in the rail groove 14. .

When the sewing operation is started, the needle 3 reciprocates up and down along the moving path 4 and the needle 3
The lower shaft 16 of the sewing machine is driven to rotate about the rotation axis common to the rotation axis 5 in synchronization with the above operation. This lower shaft 16
The mounting portion 17 of the outer hook 6 is fixed to the outer hook 6, and the outer hook 6 is rotationally driven in the outer hook rotation direction A together with the lower shaft 16. At this time, the inner bite 7 is inserted into the detent
Is prevented from being driven to rotate in the same direction with the rotation of the outer kettle 6, and the outer periphery of the inner kettle 7, which is thus prevented from rotating, is removed. The needle thread 2 captured by the sword tip 13 of the hook 6 passes over the thread, and the needle thread 2 is configured to engage with the bobbin thread to form a seam.

FIG. 8 is a cross-sectional view of the inner hook 7 partially cut away as viewed from below in FIG. Rail 15 of the inner kettle 7
Is formed substantially at the center of the peripheral wall 21 in the direction of the axis 22. The flange 9 is formed on the open end side of the peripheral wall 21, and the stud 24 is erected on the bottom 23. Is formed. A needle drop hole 26 through which the needle 3 is inserted is formed in the upper part of the peripheral wall 21 in FIG. The rail 15 is divided on both sides in the circumferential direction with the needle drop hole 26 interposed therebetween. A thread splitting portion 27 is formed on the downstream side in the outer hook rotating direction A. It is formed. Thread pullout 2
8 has an end surface 28a substantially parallel to an imaginary plane including the axis 22 of the inner kettle 7, and the thread splitting portion 27 serves to guide the needle thread 2 captured by the blade 13 to the bottom 23 side of the inner kettle 7. An end face 29 is formed which is inclined from the bottom 23 toward the opening end toward the upstream side in the outer hook rotation direction A.

The reason why the rail 15 is formed substantially at the center in the direction of the axis 22 of the peripheral wall 21 is as follows. That is, the needle thread 2 provided by the needle 3 is
In order to facilitate the movement of the needle thread 2 when the needle thread 2 is captured by the
A yarn guide surface having an angle θ with respect to the outer peripheral surface of the peripheral wall 21 parallel to the axis 22 over a range of about 180 ° from the vicinity of the yarn dividing section 27 to the downstream of the outer hook rotating direction A on the periphery of the bottom 23 of the 30 are formed. The angle θ of the yarn guide surface 30
It is empirically known that if the angle is about 18 ° or more, the needle thread 2 can smoothly pass over the thread, and the thread guide surface 30 is formed over the thickness T of the peripheral wall 21. On the other hand, rail 15
Is formed in the track groove 1 of the outer kettle 6 rotating at high speed.
Since it is necessary to support the inner furnace 7 while sliding on the inner peripheral surface of the inner furnace 4, the inner furnace 7 must be formed at a portion having a thickness T determined from the mechanical strength of the inner furnace 7. In this manner, the position of the rail 15 is determined by the angle θ of the yarn guide surface 30 and the thickness T of the peripheral wall 21, and this position is determined by the axis 2 of the peripheral wall 21.
2, the rail 15 is selected at a substantially central position along the axis 22 of the peripheral wall 21 as described above.

[0007]

In the prior art described above, the rail 15 is formed substantially at the center of the peripheral wall 21 in the direction of the axis 22.
As shown in FIG. 7, the end face 3 on the open end side above the axis 22 of the inner kettle 7 and along the axis 22 of the rail 15
It is located closer to the opening end than 1. Moreover, the lower end of the rail 15 is supported at the center position B in the width direction along the rotation axis 5 of the rail groove 14 of the outer hook 6 in the inner hook 7.
Therefore, the outer hook 6 is moved to the inner hook 7 with a moment M acting on the inner hook 7 in a clockwise direction as viewed from the downstream side of the outer hook rotating direction A with respect to the center position B. It is driven to rotate around at high speed. However, the outer hook 6 and the inner hook 7 need to suppress the relative rotation to a slight frictional resistance, and the fitting between the rail groove and the rail is finished to about 4/100. When the kettle 6 rotates, the rail 15 tilts toward the open end of the inner kettle 7 with B as a fulcrum due to the action of the moment M, and the rail 1
The leading end portion 32 of the thread dividing portion 28 of No. 5
Collides with the inner surface 33 on the open end side, and a loud noise is generated. In addition, when the tip portion 32 collides with the inner surface 33, the rotation torque of the inner hook 7 varies due to the rotation of the outer hook 6, and as a result, the contact resistance between the biting recess 10 and the projection 12 varies. However, there is a problem that the tension of the needle thread passing therethrough changes while passing over the thread and thread balls and looping occur.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vertical full rotation kettle capable of forming a high-quality seam by eliminating generation of a bite noise, preventing generation of thread balls and looping.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a rail of an inner hook is fitted into a rail groove of an outer hook which is driven to rotate about a rotation axis substantially perpendicular to a movement path of a needle reciprocated up and down. ,
The inner hook is supported by the outer hook in a state where the rotation of the inner hook is prevented, and the bobbin around which the bobbin thread is wound and the bobbin case for holding the bobbin in the inner hook are detachably attached to the inner hook. In the full vertical rotating kettle to be mounted, the center position of the width of the rail and the groove along the axis 53 of the inner hook is perpendicular to the axis 53 of the inner hook, and the bobbin and the bobbin case around which the bobbin thread is wound. Is selected so as to be located on a virtual plane including the center of gravity of the mounted inner kettle or closer to the opening end of the inner kettle than the virtual plane, and the bottom 58 of the peripheral wall 56 of the inner kettle is parallel to the axis 53. The yarn guide surface 73 forming an angle θ of about 18 ° with the outer peripheral surface 72
From the region θ1 to the lower part of the inner kettle,
This region θ1 is 135-160 around the axis 53.
゜, and the center axis 75 of the cylindrical inner peripheral surface 74 of the inner hook is eccentric by a predetermined distance ΔT on the opposite side of the axis 53 from the area θ1. There is even a rotation. Further, the present invention also provides an inner hook rail fitted into an outer hook rail groove which is driven to rotate about a rotation axis substantially perpendicular to a movement path of a needle reciprocated up and down,
The inner hook is supported by the outer hook in a state where the rotation of the inner hook is prevented, and the bobbin around which the bobbin thread is wound and the bobbin case for holding the bobbin in the inner hook are detachably attached to the inner hook. In the inner hook of the vertical rotating rotary hook to be mounted, the center position of the width of the rail along the axis 53 of the inner hook is a bobbin and a bobbin case which are perpendicular to the axis 53 of the inner hook and around which the bobbin thread is wound. Is selected so as to be located on a virtual plane including the center of gravity of the mounted inner kettle or closer to the opening end of the inner kettle than the virtual plane, and the bottom 58 of the peripheral wall 56 of the inner kettle is parallel to the axis 53. A yarn guide surface 73 which forms an angle θ of about 18 ° with the outer peripheral surface 72 is formed over a region θ1 from the yarn dividing portion 67 to the lower portion of the inner hook, and the region θ1 extends around the axis 53 from 135 to 160.゜ Selected about degree, inner bite A central axis 75 of the cylindrical inner peripheral surface 74, wherein the axis 53 the region θ1 than the opposite side, there until either of the vertical full rotary kiln, characterized in that to decenter distance ΔT the predetermined.

[0010]

According to the present invention, the inner hook rail is fitted into the outer hook rail groove, the inner hook is supported by the outer hook, and the outer hook is rotationally driven in a state where the inner hook is prevented from rotating. You. Such a rail and a rail groove are formed on a virtual plane passing through the center of gravity of the inner hook or at a position closer to the opening end of the inner hook than the virtual plane. This prevents the thread splitting portion of the inner rail from shifting in the axial direction toward the open end of the inner rail from the rail groove, and prevents the rail and the inner surface of the rail groove from colliding with each other. It is possible to prevent the occurrence of thread balls and looping due to the generation of sound and the change in the tension of the needle thread.

Further, according to the present invention, the rail is operated so that the moment acting on the upper part of the inner kettle becomes zero or the moment in the direction in which the upper part of the inner kettle falls to the bottom acts on the inner kettle. And the center position of the width of the rail groove is selected, so that the rail does not collide with the inner surface of the inner groove on the open end side in the axial direction of the rail groove, resulting in generation of a bite sound and a change in the tension of the needle thread. The occurrence of thread balls and looping can be prevented. The axis 53 of the inner kettle is parallel to the outer peripheral surface 72 of the peripheral wall 56 of the inner kettle.
The yarn guide surface 73 is formed at an angle θ of about 18 ° with respect to the outer peripheral surface 72.
The inner peripheral surface 74 is formed over an area θ1 of about 35 to 160 °, and is formed on the inner peripheral surface 74 so that the yarn guide surface 73 forming the angle θ of about 18 ° can be reliably formed on the outer peripheral surface 82 of the bottom 58. Is eccentric to the opposite side to the area θ1 by a predetermined distance ΔT.

[0012]

FIG. 1 is a vertical full-rotation kettle 4 according to an embodiment of the present invention.
2 is an exploded perspective view of the vertical full rotation kettle 41. FIG. Vertical full rotation kettle 4 provided for sewing machine
1 is a needle 43 through which a needle thread 42 is inserted and which is reciprocated up and down.
An outer hook 46 driven to rotate in an outer hook rotation direction A about a rotation axis 45 substantially perpendicular to the movement path 44 of the outer hook 46;
In a state in which the rotation accompanying the rotation of is prevented, an inner hook 47 is housed in an outer hook 46, and a bobbin case 48 is detachably mounted on the inner hook 47. Bobbin case 48
The bobbin 80 around which the bobbin thread 80a is wound is housed. The outer hook 46, the inner hook 47, the bobbin case 48 and the bobbin 80 are made of steel or aluminum, and a resin may be partially used.

The outer hook 46 has a mounting portion 49 to which a lower shaft 50 of the sewing machine is fixed. The lower shaft 50 is coaxial with the rotation axis 45 of the outer kettle 45. Outer bite 46
Has a sword tip 54, and captures the needle thread 42 inserted into the needle 43 by the sword tip 54. The outer hook 46 and the lower shaft 50 are driven to rotate in synchronization with the operation of the needle 43. A rail groove 51 is formed on the inner periphery of the outer kettle 46, and a rail 52 that fits into the rail groove 51 is formed on the outer periphery of the inner kettle 47. The rail groove 51 and the rail 52 are connected to the inner hook 4
7 is formed near the opening end of the inner kettle 47, that is, on the right side in FIG. 1, and the center position of the width of the rail 52 along the axis 53 is perpendicular to the axis 53 of the inner kettle 47 and the center of gravity G Exists on the virtual plane including or closer to the open end of the inner kettle 47 than the virtual plane.

That is, the rail groove 51 and the rail 52 are located at a position closer to the axis 5 than the position where the conventional rail and the rail groove are formed.
3 is formed near the opening end of the inner kettle 47. The center of gravity G is not the center of gravity of the inner kettle 47 alone,
Is selected as the center of gravity when the bobbin case 48 and the bobbin 80 are stored. When the center of gravity G of the inner kettle 47 is determined in this way, the bobbin 80 and the bobbin case 48 are included in such a manner that the respective centers of gravity of the bobbin 80 and the bobbin case 48 are mounted in the inner kettle 47,
It is located closer to the opening end than its own center of gravity, and generates the largest moment for tilting the upper part 47a of the inner kettle 47 toward the opening end with respect to the lowest point C of the rail 52, so that the largest moment is generated. This is because it is necessary to stabilize the entire bite during sewing in the state.

More specifically, the bobbin 80, a cylindrical winding tube 81 on which the bobbin thread is wound, and a pair of flanges 82, 83 fixed to both ends of the winding tube 81 in the axial direction.
And The bobbin case 48 includes an inner kettle 47.
A cylindrical tubular portion 84 fitted along the inner circumference of the tubular portion;
4, a bobbin thread insertion hole 9 formed in the cylindrical portion 84.
0, a thread tension spring 91 for resiliently pressing the bobbin thread 80a inserted on the outer peripheral surface of the cylindrical portion 84, an end wall 85 for closing one axial end of the cylindrical portion 84, and A straight cylindrical bobbin support cylinder 86, which is set up toward the other axial end of the portion 84, and into which a stud 59 described later of the inner kettle 47 is inserted and a winding cylinder 81 of the bobbin 80 is inserted externally, A latch member 88 provided on the wall 85 and engaging with an engagement groove 87 formed in the tip portion 59a of the stud 59;
5 is connected to one end in the longitudinal direction so as to be angularly displaceable, and the other end in the longitudinal direction is angularly displaced in a direction away from the end wall 85 to move the latch member 88 in the longitudinal direction so that the stud is moved. And an operation lever 89 for releasing the engagement state of the 59 with the distal end portion 59a. In this way, the bobbin case 48 is provided with the end wall 85, the bobbin support tube 86, the latch member 88, and the operation lever 89 at one axial end of the cylindrical portion 84.
The center of gravity of 8 is located closer to one end in the axial direction than the center position along the axis. Therefore, when such a bobbin case 48 is attached to the inner hook 47 together with the bobbin 80,
Inner kettle 4 including bobbin case 48 and bobbin 80
The center of gravity of 7 moves to the opening end side with respect to the center of gravity of the inner kettle 47 itself. Therefore, as described above, the virtual center plane of the width of the rail 52 and the rail groove 51 includes the center of gravity of the inner kettle 47 in a state where the bobbin case 48 and the bobbin 80 are mounted, and is perpendicular to the axis 53 of the inner kettle 47. It is formed so as to be closer to the opening end than above or its virtual plane.

FIG. 3 is a front view of the inner hook 47 viewed from the right side of FIG. 1, and FIG. 4 is a rear view of the inner hook 47 viewed from the left side of FIG. FIG. 3 is partially cut away for ease of illustration. The inner hook 47 includes a substantially cylindrical peripheral wall 56 on which the rail 52 is formed on the outer peripheral portion, and a peripheral wall 5.
6 has a flange 57 integrally formed at the open end thereof, and a bridge 60 which extends in a diameter direction at the bottom 58 of the peripheral wall 56 and has a stud 59 formed on the axis 53 toward the open end. . In the flange 57, a bite recess 61 for preventing rotation of the inner pin 47 is formed, and a projection 63 of a detent member 62 fixed to the machine body of the sewing machine fits into the bite recess 61. . Therefore, outer hook 46
Is driven to rotate in the outer bite rotating direction A, the receiving surface 64 facing the outer bite rotating direction upstream side of the projection 63 becomes the bite stopper recess 61.
Abuts on the contact surface 65 facing the downstream side of the outer pinwheel rotation direction A,
The rotation of the inner kettle 47 is prevented. With the contact surface 65 in contact with the receiving surface 64 in this manner, the cloth-side tension portion 42b of the needle thread 42 captured by the sword tip 54 of the outer hook 46 is moved to the receiving surface 6b.
4 and the contact surface 65, and the balance (not shown) is lifted to raise the balance-side tension portion 43a of the needle thread 42 and engage with the bobbin thread to form one stitch. You.

In the peripheral wall 56, a needle drop hole 66 (see FIG. 1) through which the needle 43 is inserted is formed on the bottom 58 side from the portion where the bite recess 61 of the flange 57 is formed. The rail 52 is cut off on both sides in the circumferential direction with the needle drop hole 66 interposed therebetween. A thread splitting portion 67 is formed on the downstream side in the outer hook rotating direction A, and a yarn pull-out portion 68 is provided on the upstream side in the outer hook rotating direction A. Is formed. The end surface 69 of the thread splitting portion 67 is formed so as to be inclined toward the bottom 58 toward the downstream side in the outer hook rotating direction A, and as shown in FIG.
2b is guided to the bottom of the inner kettle 47. The end face 70 of the thread pull-out portion 68 is formed substantially parallel to a plane including the axis 53. Since the end surface 69 of the thread splitting portion 67 is formed so as to be inclined toward the bottom 58 in this manner, the center position of the width of the rail 52 exceeds the imaginary plane including the center of gravity G and perpendicular to the axis 53 and the inner hook 4
7, the end face 69 is kept close to the rail groove 51.
Since the inner surface 71 facing the opening end side of the inner hook is in contact with the inner hook 71, there is no possibility that a large impact is generated, and the thread splitting portion 67 of the rail 52 can be smoothly inserted into the rail groove 51.
There is no fear that the smooth rotation of the motor will be impaired.

FIG. 5 is a sectional view showing the inner hook 47 as viewed from below in FIG. At the bottom 58 of the peripheral wall 56, a thread guide surface 73 forming an angle θ with respect to an outer peripheral surface 72 parallel to the axis 53 of the inner kettle 47 for facilitating the passing of the needle thread 42 is provided at least in a thread dividing portion. It is formed over a region θ1 (see FIG. 4) from 67 to the lower part of the inner kettle 47. The angle θ of the yarn guide surface 73 is, as in the prior art,
Empirically, it is selected to be about 18 ° as an easy angle through the thread. Further, the angle θ1 corresponding to the circumferential area where the yarn guide surface 73 is formed is selected to be about 135 to 160 °. The area θ1 is at least when the needle thread 42 passes over the bottom 5.
8 may be formed in a region that obstructs movement of the needle thread loop, that is, from the thread dividing portion 67 to the lower portion of the inner hook 47. It should be noted that, as described above, the center position of the width of the rail 52 has been moved to the center of gravity G near the opening end of the inner hook 47, so that the angle θ is secured at about 18 °, and the thread guide is secured. In order to form the surface 73 from the outer peripheral surface 72 to the inner peripheral surface 74, the central axis 75 of the cylindrical inner peripheral surface 74 is on the opposite side of the axis θ 53 of the inner kettle 47 from the region θ 1, that is, FIG. It is eccentric by the distance ΔT to the right. Such eccentricity causes a change in the thickness of the peripheral wall, but does not cause a change in weight. Therefore, there is no possibility that the rotational resistance on the sliding surface between the rail groove 51 and the rail 52 increases. Therefore, as shown in FIG. 6A, when the cloth-side tension portion 42 a of the needle thread 42 passes between the contact surface 65 of the squeezing recess 61 and the receiving surface 64 of the projection 63, the size is large. As shown in FIG. 6 (2), there is no danger of being pinched by force, and this does not cause an undesired change in the tension of the needle thread 42 when passing over the thread, and smoothly abuts the receiving surface 64 as shown in FIG. It is possible to smoothly pass over the yarn by passing between the surface 65 and thereby, it is possible to prevent looping and occurrence of yarn balls. The inner diameter d of the inner peripheral surface 74 and the outer diameter D of the outer peripheral surface 72 are the same as those of the conventional vertical full-rotation line 1
This is the same as described above, and it is not necessary to greatly change the shape of the conventional outer hook, and it is sufficient to change only the position of the rail toward the inner hook opening end. In addition, the bobbin and the bobbin case may be the same as those in the related art, and there is no need to change the configuration.

By moving the rail 52 of the inner kettle 47 near the opening end in this manner, the axis 5 of the rail 52 is
3 and perpendicular to the axis 53 and at the center of gravity G
Therefore, at the lowest point C (see FIG. 1) of the rail 52 that supports the inner hook 47 in the rail groove 51, the upper part of the inner hook 47 is defined as the opening end side with respect to the lowermost point C. There is no danger of generating a clockwise rotation moment. Therefore, the thread splitting portion 6 of the rail 52
There is no danger that the distal end portion 76 of the 7 will collide with the inner surface 77 facing the bottom 58 side of the rail groove 51 during the rotation of the outer hook, thereby making it possible to eliminate the occurrence of a hook noise during sewing. Further, there is no possibility that the rotation of the outer kettle 46 impairs the stability of the rotational torque received by the inner kettle 47.

As another embodiment of the present invention, as shown by an imaginary line 67a in FIGS. 1, 3 and 4, the thread splitting portion of the rail 52 is formed to extend to the upstream side in the outer pinch rotation direction A. be able to. In other words, when the cloth side tension portion 42b1 of the needle thread 42 captured by the sword tip 54 is expanded by the sword tip 54 toward the bottom of the inner kettle 47 with the rotation of the outer kettle 46, the rail groove 51 and the rail 52 are moved inward. Since it is closer to the open end of the hook 47, the cloth-side tension portion 42b of the needle thread 42 is provided.
The spread of the needle thread 42 when the needle 1 is carried to the thread dividing portion 67 of the rail 51 by the blade point 54 may be small. In other words, even if the rotation angle of the tip 54 of the outer hook 46 is small, the needle thread 42 relatively spreads to the bottom side of the thread dividing section 67 of the rail 52, so that the thread dividing section can be extended. Therefore, the cut-out length of the rail 52 cut off between the yarn splitting and the yarn pull-out can be reduced, and the movement of the inner hook during rotation of the outer hook can be reduced.

[0021]

As described above, according to the present invention, the rail and the rail groove are positioned such that the center of the width along the axis of the inner furnace is perpendicular to the axis of the inner furnace and includes a center of gravity or a virtual plane including the center of gravity. Since it is formed so as to be near the opening end, during rotation of the outer cage, the rail is prevented from colliding with the inner surface of the rail groove, preventing generation of loud noise, and rotation of the outer cage to prevent the inner rail from rotating. It is possible to suppress the fluctuation of the rotational resistance applied to the kettle, thereby eliminating the undesired change in the tension of the needle thread and preventing the occurrence of thread balls and looping.

Furthermore, according to the present invention, the inner wall peripheral wall 56
A thread guide surface 73 is provided on the bottom 58 of the outer peripheral surface 7 parallel to the axis 53.
2 is formed at an angle θ of about 18 °, and a region θ1 in which the yarn guide surface 73 is formed extends from the yarn dividing portion 67 to the lower portion of the inner kettle around the axis 53 from 135 to 16
The central axis 75 of the inner peripheral surface 74 of the inner cylinder formed over about 0 ° and eccentric to the opposite side to the region θ1 by a distance ΔT. Therefore, in order to facilitate the thread passing, the thickness of the peripheral wall 56 in the area θ where the thread guide surface 73 is formed is increased while securing the angle θ = about 18 °, so that the thread passing is performed smoothly. Can be made. Further, in the present invention, the outer hook, the bobbin and the bobbin case may be the same as in the prior art, and there is no need to change the configuration, so that the present invention is easy to implement.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a vertical full rotation kettle 41 according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a vertical full rotation kettle 41. FIG.

3 is a partially cutaway front view of an inner hook 47 as viewed from the right side of FIG. 1;

FIG. 4 is a bottom view of the inner hook 47 as viewed from the left side in FIG.

FIG. 5 is a bottom view in which a part of the inner hook 47 is cut away as viewed from below in FIG.

6 (a) and 6 (b) are views for explaining the operation of the inner pin 47 when the yarn is passed over the yarn. FIG. 6 (1) shows the balance-side tension portion 42b of the needle yarn 42 supported by the yarn dividing portion 67 of the rail 52. FIG. 6B shows a state in which the cloth side tension portion 42 of the needle thread 42 is shown.
The state immediately after passing through the squeezing recess 61 is shown.

FIG. 7 is a cross-sectional view of a typical prior art vertical full rotation kettle 1;

8 is a bottom view showing the inner hook 7 shown in FIG. 7 partially cut away.

[Explanation of symbols]

 41 Vertical full rotation hook 42 Needle thread 43 Needle 44 Movement path 45 Rotation axis 46 Outer hook 47 Inner hook 48 Bobbin case 50 Rail groove 52 Rail 53 Inner hook axis 56 Peripheral wall 58 Bottom 61 Biting recess 62 Detent member 67 Thread Dividing part 68 Thread pull-out part 73 Thread guide surface

Claims (2)

(57) [Claims] 1. A rail groove of an outer kettle, which is driven to rotate about a rotation axis substantially perpendicular to a movement path of a needle reciprocated up and down,
The rail of the inner bite is fitted, the inner bite is supported by the outer bite in a state where the rotation of the inner bite is prevented, and the inner bite is a bobbin around which bobbin thread is wound, and the bobbin is inserted into the inner bite. In a vertical full rotation kettle in which the bobbin case to be held is detachably mounted, the center position of the width of the rail and the groove along the axis 53 of the inner hook is perpendicular to the axis 53 of the inner hook and the bobbin thread Is selected so as to exist on a virtual plane including the center of gravity of the inner kettle on which the bobbin around which the bobbin is wound and the bobbin case is mounted or closer to the opening end of the inner kettle than the virtual plane, and the bottom 58 of the peripheral wall 56 of the inner hook The yarn guide surface 7 forms an angle θ of about 18 ° with the outer peripheral surface 72 parallel to the axis 53.
3 is formed over a region θ1 from the yarn dividing section 67 to the lower portion of the inner hook, and the region θ1 is formed around the axis 53 by 135 to 160.
中心, the center axis 75 of the cylindrical inner peripheral surface 74 of the inner hook is decentered by a predetermined distance ΔT on the opposite side of the axis 53 from the area θ1. Rotating bite. 2. A track groove of an outer kettle which is driven to rotate about a rotation axis substantially perpendicular to a movement path of a needle reciprocated up and down,
The rail of the inner bite is fitted, the inner bite is supported by the outer bite in a state where the rotation of the inner bite is prevented, and the inner bite is a bobbin around which bobbin thread is wound, and the bobbin is inserted into the inner bite. In a vertical rotary kiln in which a bobbin case to be held is detachably mounted, a center position of a rail width along the axis 53 of the internal hook is perpendicular to the axis 53 of the internal hook and a bobbin thread. Is selected so as to exist on a virtual plane including the center of gravity of the inner kettle on which the bobbin around which the bobbin is wound and the bobbin case is mounted or closer to the opening end of the inner kettle than the virtual plane, and the bottom 58 of the peripheral wall 56 of the inner kettle The yarn guide surface 7 forms an angle θ of about 18 ° with the outer peripheral surface 72 parallel to the axis 53.
3 is formed over a region θ1 from the yarn dividing section 67 to the lower portion of the inner hook, and the region θ1 is formed around the axis 53 by 135 to 160.
中心, the center axis 75 of the cylindrical inner peripheral surface 74 of the inner hook is decentered by a predetermined distance ΔT on the opposite side of the axis 53 from the area θ1. Inside the rotating bite.