JPH10201977A - Engagement structure for rotating hook bobbin case holder with bobbin case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer a engagement structure for a rotating hook bobbin case holder with a bobbin case, with which it is possible to install the bobbin case in the holder stably. SOLUTION: A detaining recess 43 recessing outward in radial direction from the inside circumferential surface 42 is formed at the peripheral wall 52 of a rotating hook bobbin case holder 30. A bobbin case 31 is displaceable and has a latch 66 where a detent projection 45 is formed. The latch 66 is energized by a spring in the direction of protruding the projection 45 outward in radial direction, and the projection 45 is protruded resiliently. The projection 45 is provided with an engagement surface 47 which is positioned more outward in radial direction of the bottom case 31 as going nearer to its opening, and this surface 47 contacts resiliently with that part 46 on the peripheral edge of recess 43 which is positioned on the open side of the rotating hook bobbin case holder. That part 48 of the surface 47 which is positioned the most outside in the radial direction lies nearer the bottom wall 53 of the rotating hook bobbin case holder 30 than the above-mentioned part 46, in the conditions of the bobbin case 31 installed in the rotating hook 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical rotation rotary kettle, and more particularly, to an engagement structure between an inner hook and a bobbin case for preventing a bobbin case from being attached to the inner hook.

[0002]

FIG. 9 is an exploded perspective view showing a typical prior art vertical full rotation kettle 22. FIG. 10 shows a state in which a bobbin 2 is housed in a bobbin case 1 and mounted on an inner kettle 3. FIG. 4 is a cross-sectional view showing an engagement state between the bobbin case 1 and the inner hook 3. The inner hook 3 is rotatably driven about the horizontal rotation axis L1. The inner hook 3 is housed in a detented state. The inner hook 3 has a bobbin case 1 detachably attached thereto. Accommodates the bobbin 2 on which the bobbin thread 5 is wound.

The bobbin case 1 has a substantially C-shaped peripheral wall 6 opening upward in FIG. 9, an end wall 7 for closing one end of the peripheral wall 6 in the axial direction, and engagement with the end wall 7 along one diameter line. It has a latch 8 slidably mounted in a direction A1 and a release direction A2 opposite to the engagement direction, and an operation piece 9 for displacing the latch 8 in the one diameter line direction. The latch 8 is provided with a spring force in the engagement direction A1 by a spring (not shown).
A bobbin thread tension spring 1 is provided on a peripheral wall 6 of the bobbin case 1.
0 is provided, and the bobbin thread 5 of the bobbin 2 housed in the bobbin case 1 is drawn through between the peripheral wall 6 and the bobbin thread tension spring 10 as shown by the imaginary line 5a, and applies tension to the bobbin thread 5. It is configured to be able to.

The bobbin 2 housed in the bobbin case 1 has a pair of flanges 11a and 11b,
1a and 11b. The inner kettle 3 has a peripheral wall 13, a bottom 14 extending in one diameter direction at one axial end of the peripheral wall 13, and a stud 15 erected on the bottom 14 toward the open end.
An annular fitting recess 16 is formed at the free end of the stud 15.

[0005] The end wall 7 of the bobbin case 1 is also provided with a peripheral wall 6.
A cylindrical part 17 is formed along the axis of the peripheral wall 6 toward the opening end of the stud 15. The cylindrical part 17 has the stud 15 with the bobbin case 1 mounted on the inner hook 3.
Is inserted, projects outward from a central hole 18 formed in the end wall 7, and passes through a first through hole 19 formed in the latch 8,
It is partially fitted into the second through hole 20 formed in the operation piece 9 and is exposed to the outside.

In the state where the bobbin case 1 is mounted on the inner hook 3 as described above, the peripheral portion 21 facing the first through hole 19 of the latch 8 is fitted into the fitting recess 16 of the stud 15, and in this manner. The inner hook 3 and the bobbin case 1 are engaged,
The bobbin case 1 is retained by the inner kettle 3. The bobbin 2 housed in the bobbin case 1 is housed in the bobbin case 1 with the cylindrical portion 17 of the bobbin case 1 inserted through the winding drum 12 of the bobbin 2, and the bobbin thread 5 of the bobbin 2 , The bobbin thread tension spring 10 and the peripheral wall 6 as described above.
Are drawn out to the outside as shown by the imaginary line 5a and can be sewn with a preferable tension.

[0007]

In such a conventional technique, the peripheral edge portion 21 facing the first through hole 19 of the latch 8 is fitted into the fitting recess 16 of the stud 15, and the bobbin case 1 and the inner portion are connected to each other. The engagement of the hook 3 prevents the bobbin case 1 from being pulled out of the inner hook 3.
The peripheral edge portion 21 facing the through hole 19 is separated from the inner peripheral surface 16a of the fitting recess 16 of the stud 15 with an interval, and is also loosely fitted in the axial direction of the fitting recess 16. And the bobbin case 1 is attached to the inner kettle 3,
It is in a state where it can be displaced relative to the inner kettle 3 in its axial and radial directions. Therefore, when the outer hook 4 is rotated and sewn, the bobbin case 1 is displaced in the inner hook 3 due to vibrations and the like, thereby generating a collision sound between the bobbin case 1 and the inner hook 3. Would. Further, when the bobbin case 1 is displaced, the tension of the bobbin thread 5 changes, and the formed stitch is not stable.

[0008] Further, since the bobbin case 1 is prevented from being pulled out by the inner hook 3 using the stud 15, the bobbin case 1
The stud 15 is indispensable for mounting on the inner hook 3. The bobbin 2 must be accommodated avoiding the area where such a stud 15 exists.
The bobbin thread 5 that can be wound around is shortened, and the amount of sewing by one bobbin 2 is reduced.

Accordingly, an object of the present invention is to increase the length of a bobbin thread that can be stably mounted on an inner hook and that can be wound around a bobbin stored in the bobbin case. An object of the present invention is to provide a possible engagement structure between the inner hook and the bobbin case.

[0010]

According to a first aspect of the present invention, there is provided an inner hook having an engagement recess which is recessed radially outward from an inner peripheral surface, and the bobbin case has an outer peripheral surface formed therein. An engagement projection is provided which resiliently projects radially outward from the engagement projection. The engagement projection has an inner periphery of an opening peripheral edge of the engagement recess when the bobbin case is mounted on the inner cavity. An inner hook and a bobbin case, wherein an engaging surface which resiliently comes into contact with a portion on an open end side and protrudes outward in a radial direction of the bobbin case toward the opening of the bobbin case is formed. And the engagement structure. According to the present invention, the inner hook is formed with an engaging recess which is recessed radially outward from the inner peripheral surface, and the engaging protrusion which resiliently projects radially outward from the outer peripheral surface on the bobbin case. This engagement protrusion fits into the engagement recess when the bobbin case is attached to the inner hook.
An engagement surface is formed on the engagement protrusion, and the engagement surface is a portion of the engagement concave portion on the inner bite open end side of the opening peripheral portion of the engagement recess when the bobbin case is mounted on the inner bite. Abuts elastically. By this elastic force, the bobbin case can be urged against the inner hook along one diameter line thereof. Thereby, the portion opposite to the engagement protrusion of the bobbin case is elastically brought into contact with the inner peripheral portion opposite to the engagement recess of the inner hook, and the bobbin case is moved in the one diameter direction. It can be held elastically by an inner hook. Furthermore, the engagement surface is formed so as to protrude radially outward as it approaches the opening of the bobbin case. The bobbin case is attached to the inner hook from the opening side thereof, and the engaging surface resiliently contacts the inner hook open end side portion of the opening peripheral edge of the engaging recess. The bobbin case can be urged in the direction in which the bottom wall side is separated from the open end of the inner kettle, and the end of the bobbin case near the opening is placed on the bottom wall opposite to the open end side of the inner kettle in the axial direction. The bobbin case can be resiliently held by the inner hook in the axial direction thereof by elastic contact. In this way, the bobbin case is engaged with the bobbin case so that the bobbin case is elastically held by the inner bite in the diameter direction and the axial direction of the bobbin case, and the bobbin case is prevented from being pulled out of the inner bobbin. It can be installed with. This allows the bobbin case to
It is constrained by the inner bite while being attached to the inner bite, and is attached to the inner bite in a stable state. Therefore, during sewing, the bobbin case is not displaced in the inner hook due to, for example, vibrations caused by the rotation of the outer hook, and the inner hook and the bobbin case do not collide with each other and generate a collision sound. Also, since the bobbin case is stable in the inner kettle, the tension of the bobbin thread stored in the bobbin case does not change,
Sewing can be performed with stable stitches. Further, there is no need to provide a stud, which is indispensable in the prior art, and it is possible to provide an area for storing the bobbin thread up to the area where the stud was provided. Since the bobbin thread that can be wound can be lengthened, the amount of sewing by one bobbin stored in the bobbin case increases. Thereby, the number of times of bobbin replacement can be reduced, and the efficiency of the sewing operation is improved. Further, it is also possible to use a winding bobbin, and it is possible to further increase the sewing amount in one bobbin. Further, since there is no need to provide a stud in the inner kettle, productivity of the inner kettle is improved.

According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the engagement projection is provided on the opening side of the bobbin case from the outermost peripheral portion of the engagement surface and in the radial direction of the bobbin case. An insertion guide surface extending radially inward from an inner peripheral surface of the inner hook at a portion near the open end of the inner hook at least with respect to the engagement recess is formed inward. According to the present invention, an insertion guide surface is formed on the engagement protrusion from the outermost peripheral portion of the engagement surface to the opening side of the bobbin case and radially inward of the bobbin case. At least a portion of the inner bite near the open end with respect to the engagement recess extends radially inward from the inner peripheral surface of the inner bite. Thereby, when the bobbin case is mounted on the inner hook, the end from the opening of the bobbin case is inserted into the inner hook while the engagement protrusion and the engaging recess are aligned in the circumferential direction, By pressing the bobbin case from the open end to the opposite side from the open end along the axis of the inner kettle, the insertion guide surface guides the engagement protrusions along the inner peripheral surface of the inner kettle, and the engagement protrusions It can be mounted on the inner kettle while being displaced radially inward. As described above, the bobbin case can be mounted on the inner hook by a simple operation without requiring the operation of displacing the engagement protrusion.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the bobbin case includes a latch formed with the engagement protrusion, and one end in a longitudinal direction connected to the latch. An operating piece for moving the latch in a direction in which the engagement protrusion is displaced inward in the radial direction by angularly displacing the other end in the longitudinal direction in a direction away from the latch; At least one of them is provided with angular displacement prevention means for preventing the operation piece from being angularly displaced in a direction in which the other end in the longitudinal direction of the operation piece is separated from the latch. According to the present invention, the bobbin case includes a latch on which the engagement protrusion is formed, and an operation piece having one end in the longitudinal direction connected to the latch. By angularly displacing the latch away from the latch, the latch can be moved in a direction in which the engagement protrusion is displaced radially inward. With this, when the bobbin case attached to the inner kettle is removed from the inner kettle,
By causing the operation piece to be angularly displaced so that one end of the operation piece is separated from the latch, the latch can be displaced such that the engagement protrusion comes out of the engagement recess from the engagement recess. Therefore, the engagement of the bobbin case with the inner pot can be released by raising the operating piece, and the bobbin case can be easily pulled out from the inner pot by holding the operating piece with, for example, a finger. Further, at least one of the latch and the operation piece has an angular displacement preventing means for preventing the operation piece from being angularly displaced in a direction in which the other end in the longitudinal direction of the operation piece is separated from the latch. Is provided. With this configuration, in a state where the bobbin case is mounted on the inner hook, the engaging surface of the engaging protrusion resiliently abuts on a portion of the opening peripheral edge of the engaging recess near the open end of the inner hook. Even if the latch is displaced so as to be displaced inward in the radial direction, it is possible to prevent the operation piece from being undesirably displaced such that one longitudinal end of the operation piece is separated from the latch. Therefore, there is no problem such that the operation piece gets in the way of the thread, for example.

[0013]

1 shows an inner hook 30 and a bobbin case 31 in which an engaging structure according to an embodiment of the present invention is implemented.
FIG. 2 is a cross-sectional view showing a part of the vertical full-rotation kettle 32 provided with a vertical axis, and FIG. Outer kettle 34 driven to rotate about horizontal rotation axis L10
A rail groove 35 extending in the circumferential direction is formed on the inner peripheral surface 34 a thereof, and the rail 3 formed on the outer peripheral surface 37 is formed in the rail groove 35.
The inner hook 30 is housed rotatably with respect to the outer hook 34 with the 6 fitted. The outer hook 34 is made of, for example, steel or stainless steel. Inner bite 30
A detent member 39 is fitted into the detent recess 38 and is detented. A bobbin case 31 is removably mounted on such an inner hook 30. The bobbin case 31 accommodates a bobbin 40 on which a bobbin thread 62 is wound.
In addition, in order to make illustration easy, FIG.
Are omitted (they are wound in the same manner as the bobbin 2 shown in FIG. 9).

An engagement recess 43 is formed in the inner hook 30 radially outwardly from the inner peripheral surface 42 so that the bobbin case 3
1 is provided with an engagement projection 45 that resiliently projects radially outward from an outer peripheral surface 44 thereof. When the bobbin case 31 is mounted on the inner hook 30, the bobbin case 31 resiliently comes into contact with a portion 46 on the inner hook open end side of the opening peripheral portion of the engaging recess 43. An engagement surface 47 protruding outward in the radial direction is formed toward the opening 31. Further, the engaging projection 45 has an engaging surface 47.
Of the bobbin case toward the opening side of the bobbin case and the radially inward direction of the bobbin case from the outermost peripheral portion, i.e., the portion 48 protruding most outward in the radial direction. An insertion guide surface 50 is formed which extends radially inward from the inner peripheral surface 49 of the inner hook of the portion.

FIG. 3 is a perspective view showing the inner kettle 30. As shown in FIG.
Referring also to FIG. 1, the inner kettle 30 includes a peripheral wall 52,
The peripheral wall 52 has a bottom wall 53 that closes one end in the axial direction. The inner kettle 30 is made of, for example, steel, stainless steel, or synthetic resin. The rail 3 protrudes from the outer peripheral surface 37 at an intermediate portion in the axial direction on the peripheral wall 52 and extends in the circumferential direction.
6 are formed. A needle drop hole 54 penetrating in the thickness direction is formed at one location in the circumferential direction of the peripheral wall 52 in the vicinity of the open end so as not to hinder reciprocation of a needle (not shown). Further, the needle drop hole 54 is formed in the peripheral wall 52.
At the same position in the circumferential direction, a positioning projection 55 protruding from the inner peripheral surface 42 is formed adjacent to the bottom wall 53 side in the axial direction, and is opened adjacent to the open end side of the needle drop hole 54. A detent recess 38 that is open at the end is formed.

The engagement recess 43 is formed in the peripheral wall 52 with the needle drop hole 54 by about 90 degrees clockwise as viewed from the open end side in the circumferential direction.
It is formed near the open end at a position shifted by degrees. The engagement recess 43 is realized by forming a through hole in the peripheral wall 52 in the thickness direction. The inner peripheral surface 49 of the peripheral wall 52 located on the open end side of the engagement concave portion 43 is recessed radially outward from the remaining inner peripheral surface 42.

FIG. 4 is a perspective view showing the bobbin case 31, and FIG. 5 is an exploded perspective view showing the bobbin case 31. Referring also to FIG. 1, the bobbin case 31 includes a substantially C-shaped peripheral wall 60 divided in a circumferential direction,
And a bobbin case main body 85 comprising an end wall 61 closing one end in the axial direction of the bobbin. Such a bobbin case 31
For example, steel or stainless steel. Peripheral wall 60
A bobbin thread insertion hole 63 through which the bobbin thread 62 is inserted is formed in the thickness direction of the peripheral wall 60, and the bobbin thread insertion hole 63 resiliently comes into contact with the outer peripheral surface 44 of the peripheral wall 60. A bobbin thread tension spring 65 is provided to close the spring. The base end 65a of the bobbin thread tension spring 65 is fixed to the peripheral wall 60 by a fixing bolt 65b, and the pressing force against the peripheral wall 60 on the free end 65d side can be adjusted by the adjusting bolt 65c. Is done.

The bobbin 40 can be accommodated in the bobbin case 31. The bobbin 40 includes a pair of flanges 9.
0a, 90b and a cylindrical bobbin 91 that connects the flanges 90a, 90b. The bobbin 40 is a locking shaft that is erected from the end wall 61 of the bobbin case 31 on the bobbin 91. It is stored in the bobbin case 31 with the 92 inserted. The bobbin 40 is made of, for example, steel, stainless steel, aluminum, or synthetic resin. The bobbin 40 has a winding drum 9 between the flanges 90a and 90b.
The bobbin thread 62 can be wound from 1 to the vicinity of the outermost periphery of each of the flanges 90a and 90b. Bobbin case 31
Bobbin thread 62 wound around bobbin 40 stored in
Is pulled through the peripheral wall 60 through the bobbin thread insertion hole 63, passes through between the peripheral wall 60 and the bobbin thread tension spring 65, and is pulled out under tension. In FIG. 5, the bobbin thread tension spring 65 is omitted.

A bobbin case main body (hereinafter, may be abbreviated as “main body”) 85 of the bobbin case 31 has a clock when the bobbin case 31 is viewed from the side of the end wall 61 from the divided portion 75 of the peripheral wall 60. A notch 76 penetrating through the peripheral wall 60 and the end wall 61 in the thickness direction is formed from the peripheral wall 60 to the end wall 61 at a position shifted by about 90 degrees around the periphery. In addition, the end wall 61 is provided with a dividing portion 75 of the peripheral wall 60.
A guide groove 70 extending in the direction of one diameter line is formed so as to connect a position shifted by about 90 degrees to both sides in the circumferential direction, that is, a position where the notch 76 is formed and the opposite side. In the guide groove 70, both side portions 72a, 72b in the width direction intersecting with the longitudinal direction are covered by protrusions 71a, 71b from the side opposite to the opening of the bobbin case 31.
Further, the guide groove 70 and the peripheral wall 60 are formed in the end wall 61 in the vicinity of one longitudinal end opposite to the notch 76 of the guide groove 70.
An engagement hole 77 penetrating the end wall 61 is formed so as to communicate with the inner space, and the engagement hole 77 is formed between the narrow portion 77 a near the one end in the longitudinal direction of the guide groove 70 and the guide groove 70. And a wide portion 77b near the other end in the longitudinal direction.

The bobbin case 31 further includes a latch 66 on which the engaging projection 45 is integrally formed,
6, one longitudinal end 67 is connected to the other longitudinal end 6.
And an operation piece 69 for moving the latch 66 in a direction in which the engagement protrusion 45 is displaced inward in the radial direction by angularly displacing the latch 8 in a direction away from the latch 66. The latch 66 and the operation piece 69 are provided on the end wall 61 of the bobbin case 31. The peripheral wall 60 and the end wall 61 form a substantially cylindrical bottomed bobbin case body 85, which includes the bobbin case body 85, a bobbin thread tension spring 65, a latch 66, and an operation piece 69. Thus, the bobbin case 31 is configured.

The latch 66 has a plate shape, and an engaging projection 45 is integrally formed at one end 74 in the longitudinal direction. The engaging projection 45 is curved to one side in the thickness direction. The outer peripheral surface of the engaging projection 45 including the engaging surface 47 and the insertion guide surface 50 is formed in an arc shape, and its curvature radius R is, for example, 3
mm. The center O of the curvature is set in the engagement recess 43 when the bobbin case 31 is mounted on the inner hook 30.
Inner bite 3 of the peripheral edge of the inner bite than the portion 46 near the open end
0 near the bottom wall 53. The latch 66 is provided with the engagement protrusion 45.
Are fitted into the guide grooves 70 in a state where they are curved toward the opening of the bobbin case 31. In this state, both sides 73a, 73 in the width direction intersecting with the longitudinal direction of the latch 66.
3b is locked by the protruding portions 71a and 71b, and the latch 66 is moved along the guide groove 70 along the guide groove 70 in a state where the axial displacement of the bobbin case 31 is prevented.
Are provided movably in a protruding direction B1 protruding outward in the radial direction, and conversely, in an evacuation direction B2 in which the engaging projection retreats inward in the radial direction.

The latch 66 is provided with a spring receiving portion 78 protruding outward in the width direction on one side portion 73a in the width direction near one end portion 74 in the longitudinal direction. A spring housing recess 79 is formed in the end wall 61 along one widthwise side 72a near the other end in the longitudinal direction of the guide groove 70.
0 is stored. When the latch 66 is fitted in the guide groove 70, the direction of protrusion B
Receiving the spring force of 1, the engaging projection 45 resiliently protrudes radially outward from the outer peripheral surface 42 of the peripheral wall 60.

The other end 82 in the longitudinal direction is
In the vicinity, a locking piece insertion hole 81 penetrating in the thickness direction is formed. The locking piece insertion hole 81 has a wide portion 81a near one longitudinal end 74 of the latch 66 and a narrow portion 81b near the other longitudinal end 82 of the latch 66.

The operating piece 69 has a locking piece 83 at one end 67 in the longitudinal direction. The locking piece 83 is curved to one side in the thickness direction, and has a narrow extension 83a and a wide end. And a locking portion 83b. The width of the extending portion 83a of the locking piece 83 is selected to be smaller than the width of the narrow portion 81b of the locking piece insertion hole 81 of the latch 66, and the locking portion 8 of the locking piece 83 is formed.
3b is the width of the narrow portion 8 of the locking piece insertion hole 81 of the latch 66.
1b, and smaller than the width of the wide portion 81a. The width of the extension 83a of the locking piece 83 is
The width of the locking portion 83b of the locking piece 83 is selected to be smaller than the width of the narrow portion 77a of the locking hole 77 of the end wall 61.
The width is selected to be larger than the width of the narrow portion 77a of the locking hole 77 of the end wall 61 and smaller than the width of the wide portion 77b.

In the locking piece 69, the locking piece 83 at one end 67 in the longitudinal direction is formed by the locking piece insertion hole 8 of the latch 66.
1 is inserted into the locking hole 77 of the end wall 61.
When no external force is applied in the state where the locking piece 83 is inserted as described above, the locking piece 83 is fitted into the wide portion 77b of the locking hole 77 and the extended portion. Reference numeral 83a denotes a state in which the narrow portion 81b of the locking piece insertion hole 81 is inserted. As a result, the latch 66 engages with the operating piece 6 in a state where the locking portion 83b is locked to the peripheral edge 96 of the locking hole 77.
9 against the extension 83a of the locking piece 83, the displacement in the protruding direction B1 is prevented against the spring force of the compression coil spring 80, and the operating piece 69 The locking portion 83b is a narrow portion 81b of the locking piece insertion hole 81 of the latch 66.
Abutting against the peripheral edges of both sides to prevent the removal. As described above, the operation pieces 69 are prevented from being detached from each other.
Is a state in which the other end 68 in the longitudinal direction is separated from the latch 66 with the end on the other end 68 side in the longitudinal direction of the engaging portion 83b of the engaging piece 83 in the state of being stacked on the latch 66. The other end 68 in the longitudinal direction is opposite to the latch 66 so as to be angularly displaceable in the falling direction C2 close to the latch 66.

When no external force is applied to the bobbin case 31, the latch 66 receives a spring force in the protruding direction B1, so that the latch 66 presses the extension 83a of the locking piece 83 of the operation piece 69. In this state, the engagement protrusion 45 is
Of the operating piece 6
9 is in a state of being prone along the latch 66. In this state, when the operation piece 69 is angularly displaced in the raising direction C <b> 1, the operation piece 69 is raised with the end on the other end 68 side in the longitudinal direction of the locking portion 83 b of the locking piece 83 as the center of angular displacement. Since the angular displacement is performed in the direction C1, the extending portion 83a of the locking piece 83 is displaced in the same direction as the retracting direction B2, whereby the latch 66 can be displaced in the retracting direction B2. At this time, the notch 76 is formed from the peripheral wall 60 to the end wall 61, and the retreat of the engaging projection 45 can be allowed. Further, the locking piece 83 has an extension 83a.
Can be angularly displaced by the narrow portion 77a of the locking hole 77.

In this embodiment, at least one of the latch 66 and the operation piece 69, in the present embodiment, the other end 68 of the operation piece 69 in the longitudinal direction is separated from the latch 66, that is, in the raising direction C1. A permanent magnet piece 87 is provided as angular displacement preventing means for preventing angular displacement. The permanent magnet piece 87 is bonded and fixed to the magnet piece storage recess 88 formed near one end of the latch 66 in the longitudinal direction by an adhesive. The operation piece 69 is magnetically attracted by the permanent magnet piece 87, and it is possible to prevent the operation piece 69 from being angularly displaced in the raising direction C1.

As described above, the engaging recess 43 which is recessed radially outward from the inner peripheral surface 42 is formed in the inner hook 30, and the bobbin case 31 is elastically resilient outward from the outer peripheral surface 44 in the radial direction. An engagement protrusion 45 protruding from the engagement protrusion 45 is provided.
Is fitted into the engagement recess 43 in a state where the bobbin case 31 is mounted on the inner hook 30. An engagement surface 47 is formed on the engagement protrusion 45, and the engagement surface 47 is formed in the inner periphery of the opening peripheral portion of the engagement recess 43 when the bobbin case 31 is mounted on the inner cavity 30. It resiliently comes into contact with the portion 46 on the open end side. The bobbin case 31
Can be biased against the inner kettle along its one diameter line. As a result, the portion 101 of the bobbin case 31 opposite to the engagement protrusion 45 is resiliently brought into contact with the inner peripheral portion 102 of the inner hook 30 opposite to the engagement recess 43, and the bobbin case 31 can be resiliently held in its one-diameter direction by the inner hook 30.

Further, the engagement surface 47 is provided on the bobbin case 31.
Are formed so as to protrude radially outward as they approach the opening. The bobbin case 31 is mounted on the inner hook 30 from the opening side thereof, and the engaging surface 47 resiliently contacts the inner hook open end side portion 46 of the opening peripheral edge of the engaging recess 43. The bobbin case 31 is
The bobbin case 31 can be urged in a direction away from the open end of the inner kettle 30 toward the bottom wall 53, and the end 100 of the bobbin case 31 near the opening is positioned on the side opposite to the open end of the inner kettle 30 in the axial direction. The bobbin case 31 is resiliently brought into contact with the bottom wall 53.
Can be resiliently held in the axial direction by the inner hook 30.

The bobbin case 31 is engaged with the bobbin case 31 so that the bobbin case 31 is resiliently held by the inner bobbin 30 in the radial direction and the axial direction. 31 can be attached to the inner kettle 30 in a state where it is not pulled out. As a result, the bobbin case 31 is restrained by the inner hook 30 in a state where the bobbin case 31 is attached to the inner hook 30, and is mounted on the inner hook 30 in a stable state.
Therefore, at the time of sewing, the bobbin case 31 is displaced in the inner hook 30 due to, for example, vibration caused by the rotation of the outer hook 34, so that the inner hook 30 and the bobbin case 31 do not collide with each other, and no collision noise is generated. Further, since the bobbin case 31 is stable in the inner hook 30, the tension of the bobbin thread 62 stored in the bobbin case 31 does not change, and sewing can be performed with stable stitches.

Further, it is not necessary to provide the stud 94 which is indispensable in the prior art, and it is possible to provide a region for storing the bobbin thread 62 up to the region where the stud 94 is provided. Since the length of the bobbin thread 62 that can be wound around the bobbin 40 stored in the base 31 can be lengthened, the sewing amount of one bobbin 40 stored in the bobbin case increases. Thereby, the number of times of replacing the bobbin 40 can be reduced, and the efficiency of the sewing operation is improved.

Further, in the configuration in which the bobbin thread 62 is wound around the bobbin 40 and stored, only the range from the winding drum 91 to the vicinity of the outermost periphery of each of the flanges 90a and 90b can be wound between the flanges 90a and 90b. Therefore, a bobbin bobbin 95 as shown in FIG. 6 in which only the bobbin yarn 62 is wound without using the bobbin 40 can be used.
Thereby, one bobbin, that is, the winding bobbin 95
, The amount of sewing is further increased. Of course, if the studs 94 do not need to be provided in the inner kettle 30, the productivity of the inner kettle is improved. Further, even if the stud 90 is provided, the effects of no collision sound during sewing and stabilization of the stitch can be achieved.

Here, the outer peripheral surface including the engaging surface 47 of the engaging projection 45 and the insertion guide surface 50 is arc-shaped, and the center O thereof corresponds to the end 1 of the peripheral wall 60 of the bobbin case 31 on the open side.
00 is in contact with the bottom wall 53 of the inner pot 30, and is located closer to the bottom 46 of the inner pot 30 than to the portion 46 on the inner pot open end side of the peripheral edge of the opening of the engagement recess 43. by this,
The above-described stable state of the bobbin case 31 being attached to the inner hook 30 can be maintained.

The engagement protrusion 45 has an insertion guide surface 50 extending from the outermost peripheral portion 48 of the engagement surface 45 to the opening of the bobbin case 31 and in the radial direction of the bobbin case 31. 50 is at least the engagement recess 43
, And extends radially inward from the inner peripheral surface 49 of the inner hook 30 in a portion near the open end of the inner hook. Thereby, when the bobbin case 31 is mounted on the inner hook 30, the circumferential positioning of the engaging projections 45 and the engaging recesses 43 is performed by adjusting the inner hook 30 positioning projections 55 to the bobbin case 31.
In the state where it is fitted into the dividing portion 75 of
By inserting the end of the bobbin case 31 from the opening into the inner hook 30 and pressing the bobbin case 31 from the open end toward the opposite side along the axis of the inner hook 30,
The insertion guide surface 50 guides the engagement protrusion 45 to the inner peripheral surface 49 of the inner hook and displaces it inward in the radial direction.
It can be attached to the inner kettle 30. As described above, the bobbin case 31 can be mounted on the inner hook 30 by a simple operation without requiring the operation of displacing the engagement projection 45.

Further, the bobbin case 31 is
5 is formed, and an operating piece 69 is connected to the latch 66 at one end in the longitudinal direction.
In the direction in which the other end portion 68 in the longitudinal direction is separated from the latch 66, that is, in the direction in which the engaging protrusion 45 is displaced in the radial direction, that is, in the retreating direction B2, The latch 66 can be moved. Thus, when the bobbin case 31 attached to the inner hook 30 is detached from the inner hook 30, the operation piece 69 is moved to the other end 67 in the longitudinal direction.
The latch 66 can be displaced so that the engagement protrusion 45 comes out of the engagement recess 43 from the engagement recess 43 by angularly displacing the latch 66 to separate from the engagement recess 43. Accordingly, the engagement of the bobbin case 31 with the inner pot 30 can be released by raising the operation piece 69, and the operation piece 69 is easily sandwiched between fingers, and the bobbin case 31 is easily pulled out from the inner pot. be able to.

At this time, the tip 9 of the engagement projection 45
As shown by the phantom line 99 in FIG. 1, the wire 8 extends radially inward from the outer periphery of the bobbin 40, so that the bobbin 40 can be reliably pulled out together with the bobbin case 31.

Further, at least one of the latch 66 and the operation piece 67, in this embodiment, the other end 68 in the longitudinal direction of the operation piece 69 is angularly displaced to the latch 66 in a direction away from the latch 66. A permanent magnet piece 87 is provided to prevent such a situation. With this, when the bobbin case 31 is attached to the inner hook 30, the engagement protrusion 4
5 resiliently comes into contact with the portion 46 near the open end of the inner peripheral portion of the opening of the engaging recess 43,
The latch 6 is moved so that the engagement projection 45 is displaced radially inward.
6 is displaced, and as shown in FIG.
However, the operation piece 69 is undesirably displaced in the raising direction C1 so that the other end 68 in the longitudinal direction is separated from the latch 66 even when the operation piece 69 is loosely inserted into the locking piece insertion hole 81. Can be prevented, and there is no problem such that the operation piece 69 gets in the way of a thread, for example.

FIG. 7 is a sectional view showing a part of a vertical full rotation hook 32a in which an engagement structure between an inner hook 30a and a bobbin case 31 according to another embodiment of the present invention is implemented. FIG.
Since the engagement structure of the embodiment shown in FIG. 1 has a configuration similar to that of the embodiment shown in FIG. 1 to FIG. The reference numerals are attached and the description is omitted. In the embodiment shown in FIGS. 1 to 5, the engagement recess 43 formed in the inner hook 30 is realized by forming a hole penetrating in the thickness direction in the peripheral wall 52, but in the embodiment shown in FIG. The engagement recess 43a formed in the inner hook 30a does not penetrate in the thickness direction of the peripheral wall 52. Even with such an engagement structure having the engagement recess 43a which does not penetrate in the thickness direction of the peripheral wall, the same effect as the engagement structure of the embodiment shown in FIGS. 1 to 5 can be obtained.

FIG. 8 is a sectional view showing a part of a vertical full rotation hook 32b in which the engagement structure of the inner hook 30 and the bobbin case 31a according to still another embodiment of the present invention is implemented. The engagement structure of the embodiment shown in FIG. 8 has a configuration similar to the engagement structure of the embodiment shown in FIGS. 1 to 5, and therefore only different configurations will be described.
The same reference numerals are given and the description is omitted. In the embodiment shown in FIGS. 1 to 5, although the engagement protrusion 45 provided on the latch 66 of the bobbin case 31 is curved in an arc shape, and the arc-shaped engagement surface 47 and the insertion guide surface 50 are formed,
In the embodiment shown in FIG. 7, the latch 66 of the bobbin case 31a
The engagement protrusion 45a provided on the bobbin case 3 is bent in a chevron shape, and becomes closer to the opening of the bobbin case 31.
A flat engaging surface 47a that is inclined outward in the radial direction of 1a is formed.

Further, a flat insertion guide surface 50a is formed on the opening side of the bobbin case 31 so as to be continuous with the portion 48 of the engagement surface 47a which projects most outward in the radial direction. The insertion guide surface 50a is inclined inward in the radial direction of the bobbin case 31a toward the opening of the bobbin case 31a, and at least the inner hook 30 at the end near the open end of the inner hook with respect to the engagement recess 43. It extends radially inward from the inner peripheral surface 49. Here, the portion 48 of the engagement surface 47a that protrudes most outward in the radial direction is the bobbin case 31a that
0 and the end of the bobbin case 31a on the opening side is in contact with the bottom wall 53 of the inner hook 30 and the engagement recess 43 is
Is located closer to the bottom wall 53 of the inner kettle 30 than the portion 46 near the open end of the peripheral edge of the inner kettle 30. As described above, the engagement protrusion 47a and the insertion guide surface 5 are formed on the engagement protrusion 45a.
Even with the engagement structure forming Oa, the same effect as the engagement structure of the embodiment shown in FIGS. 1 to 5 can be obtained.

As still another embodiment of the present invention, the engaging projections 45, 45a are formed by leaf springs in order to elastically project the engaging projections 45, 45a outward in the radial direction. You may make use of resilience. As means for preventing angular displacement of the operation piece 69, a latch 66
Although the permanent magnet piece 87 fixed to the operating piece 69 is used, such a permanent magnet piece 87 may be fixed to the operating piece 69, and the permanent magnet piece 87 may be replaced with the latch 66 or the operating piece 69. At least one may be partially or wholly magnetized. Further, a spring force may be applied to the operation piece 69 in the downward / downward direction C2 using a torsion coil spring.

[0042]

According to the first aspect of the present invention, the inner hook is formed with an engagement recess which is recessed radially outward from the inner peripheral surface, and is formed on the bobbin case radially outward from the outer peripheral surface. Is provided with a resiliently projecting engagement projection, which fits into the engagement recess when the bobbin case is mounted on the inner hook. An engagement surface is formed on the engagement protrusion,
The engagement surface is in a state where the bobbin case is attached to the inner hook,
The inner peripheral portion of the opening of the engagement recess is resiliently brought into contact with the portion on the open end side of the hook. By this elastic force, the bobbin case can be urged against the inner hook along one diameter line thereof. Thereby, the portion opposite to the engagement protrusion of the bobbin case is elastically brought into contact with the inner peripheral portion opposite to the engagement recess of the inner hook, and the bobbin case is moved in the one diameter direction. It can be held elastically by an inner hook.

Further, the engaging surface is formed so as to protrude radially outward as it approaches the opening of the bobbin case. The bobbin case is attached to the inner hook from the opening side thereof, and the engaging surface resiliently contacts the inner hook open end side portion of the opening peripheral edge of the engaging recess. The bobbin case can be urged in the direction in which the bottom wall side is separated from the open end of the inner kettle, and the end of the bobbin case near the opening is placed on the bottom wall opposite to the open end side of the inner kettle in the axial direction. The bobbin case can be resiliently held by the inner hook in the axial direction thereof by elastic contact.

In this manner, the inner pin and the bobbin case are engaged so that the bobbin case is resiliently held by the inner pin in the diameter direction and the axial direction of the bobbin case, and the bobbin case is removed to the inner bit. It can be mounted while stopped.
Thus, the bobbin case is restrained by the inner hook while being attached to the inner hook, and is attached to the inner hook in a stable state. Therefore, during sewing, the bobbin case is not displaced in the inner hook due to, for example, vibrations caused by the rotation of the outer hook, and the inner hook and the bobbin case do not collide with each other and generate a collision sound. Also, since the bobbin case is stable in the inner hook, the tension of the bobbin thread stored in the bobbin case does not change,
Can be sewn.

Further, it is not necessary to provide a stud which is indispensable in the prior art, and it is possible to provide an area for storing the bobbin thread up to the area where the stud was provided. Since the bobbin thread that can be wound around the bobbin can be lengthened, the amount of sewing by one bobbin stored in the bobbin case increases. Thereby, the number of times of bobbin replacement can be reduced, and the efficiency of the sewing operation is improved. Also,
It is also possible to use a winding bobbin, and the amount of sewing on one bobbin can be further increased. Further, since there is no need to provide a stud in the inner kettle, productivity of the inner kettle is improved.

According to the present invention, an insertion guide surface is formed on the engagement protrusion from the outermost peripheral portion of the engagement surface to the opening of the bobbin case and radially inward of the bobbin case. The insertion guide surface extends at least radially inward from the inner peripheral surface of the inner hook at a portion near the open end of the inner hook with respect to the engagement recess. by this,
When attaching the bobbin case to the inner kettle, insert the end of the bobbin case from the opening into the inner kettle with the engagement projections and the engagement recesses aligned in the circumferential direction, and remove the bobbin case. By pressing the inner projection from the open end toward the opposite side along the axis of the inner oven, the insertion guide surface guides the engagement projections along the inner peripheral surface of the inner oven so that the engagement projections are radially inward. It can be mounted on the inner kettle while displacing it to the side. As described above, the bobbin case can be mounted on the inner hook by a simple operation without requiring the operation of displacing the engagement protrusion.

According to the third aspect of the present invention, the bobbin case has a latch on which the engaging projection is formed, and an operation piece having one end in the longitudinal direction connected to the latch. By angularly displacing the other end in the longitudinal direction away from the latch, the latch can be moved in a direction in which the engagement protrusion is displaced radially inward. With this, when the bobbin case attached to the inner hook is detached from the inner hook, the operating piece is angularly displaced so that one end of the bobbin case is separated from the latch, thereby causing the engaging projection to move out of the engaging recess. The latch can be displaced out of the engagement recess. Therefore,
By raising the operating piece, the engagement state of the bobbin case with the inner hook can be released, and the operating piece can be easily pulled out of the inner hook by sandwiching the operating piece with a finger, for example.

Further, at least one of the latch and the operation piece has a corner for preventing the operation piece from being angularly displaced in a direction in which the other end in the longitudinal direction of the operation piece is separated from the latch. Displacement preventing means is provided.
With this configuration, in a state where the bobbin case is mounted on the inner hook, the engaging surface of the engaging protrusion resiliently abuts on a portion of the opening peripheral edge of the engaging recess near the open end of the inner hook. Even if the latch is displaced so as to be displaced inward in the radial direction, it is possible to prevent the operation piece from being undesirably displaced such that one longitudinal end of the operation piece is separated from the latch. Therefore, there is no problem such that the operation piece gets in the way of the thread, for example.

[Brief description of the drawings]

FIG. 1 is a vertical full rotation kettle 32 in which an engagement structure between an inner kettle 30 and a bobbin case 31 according to an embodiment of the present invention is implemented.
It is sectional drawing which shows a part of.

FIG. 2 is a perspective view showing a vertical full rotation kettle 32. FIG.

FIG. 3 is a perspective view showing the inner hook 30.

FIG. 4 is a perspective view showing a bobbin case 31.

FIG. 5 is an exploded perspective view showing the bobbin case 31.

FIG. 6 is a perspective view showing a winding bobbin 95.

FIG. 7 is a cross-sectional view showing a part of a vertical full rotation hook 32a in which an engagement structure between an inner hook 30a and a bobbin case 31 according to another embodiment of the present invention is implemented.

FIG. 8 is a cross-sectional view showing a part of a vertical full rotation hook 32b in which an engagement structure between an inner hook 30 and a bobbin case 31a according to another embodiment of the present invention is implemented.

FIG. 9 is an exploded perspective view showing a typical prior art vertical full rotation kettle 22. FIG.

FIG. 10 is a cross-sectional view showing a part of a vertical full rotation kettle 22 showing an engagement structure between the inner kettle 3 and the bobbin case 1 according to the related art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 inner hook 31 bobbin case 32 vertical full rotation hook 34 outer hook 40 bobbin 42 inner circumferential surface of inner hook 43 engaging recess 44 bobbin case is outer circumferential surface 45 engaging protrusion 46 peripheral edge of engaging recess 47 engaging surface 50 insertion guide surface 66 latch 69 operation piece 87 permanent magnet piece

Claims (3)

[Claims] An engagement recess is formed in the inner hook to be depressed radially outward from the inner peripheral surface, and the bobbin case has an engaging projection that resiliently projects radially outward from the outer peripheral surface thereof. A mating projection is provided, and the bobbin case is elastically abutted on the engagement projection with a portion on the inner hook open end side of the opening peripheral portion of the engagement recess in a state where the bobbin case is mounted on the inner hook, An engagement structure between the inner hook and the bobbin case, wherein an engagement surface protruding outward in the radial direction of the bobbin case is formed toward the opening of the bobbin case. 2. An open-ended open end of at least the engaging recess from the outermost peripheral portion of the engaging surface to the opening side of the bobbin case and radially inward of the bobbin case. 2. The engagement structure between an inner hook and a bobbin case according to claim 1, wherein an insertion guide surface extending inward in a radial direction from an inner peripheral surface of the inner hook at a closer portion is formed. 3. The bobbin case includes a latch having the engaging projection formed thereon, and one end in the longitudinal direction connected to the latch, and the other end in the longitudinal direction being angularly displaced in a direction away from the latch. An operating piece for moving the latch in a direction in which the engaging projection is displaced inward in the radial direction; and at least one of the latch and the operating piece, the other end of the operating piece in the longitudinal direction is separated from the latch. 3. An angular displacement preventing means for preventing the operation piece from angularly displacing in a direction in which the operation piece is separated from each other.
An engagement structure between the inner pin and the bobbin case as described.