JP2960369B2 - Inner bite and bobbin case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotary kettle and a bobbin case, and more particularly to a structure for smooth rotation of a bobbin accommodated in the inner rotary kettle.

[0002]

2. Description of the Related Art Below a bed such as a lockstitch sewing machine,
For example, a vertical full-rotation kettle is arranged. The vertical full-rotation kettle is basically composed of an outer bit that is driven to rotate around a horizontal rotation axis, an inner bit that is housed in the outer bit, and a detachable type that is attached to and detached from this inner bit. The bobbin case includes a bobbin case that can be mounted and a bobbin that is stored in the bobbin case. The bobbin around which the bobbin thread is wound is housed in the bobbin case with the cylindrical portion of the bobbin case inserted into the bobbin winding drum, and the bobbin case is attached to the inner kettle, and the bobbin is placed in the inner kettle. Is stored. In this state, the bobbin is provided rotatable about its axis. The bobbin thread wound around the bobbin is taken out from a bobbin thread insertion hole formed in the peripheral wall of the bobbin case, and when the sewing operation is started, the bobbin thread is pulled out while the bobbin rotates in the inner hook.

[0003]

In such a conventional technique, the rotational resistance of the bobbin changes and the tension of the bobbin thread changes, which results in non-uniform stitches and degraded quality of the sewn product. There is a risk of doing it.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inner rotary hook and a bobbin case that can rotate a bobbin stably and smoothly to stabilize the tension of a bobbin thread and prevent the quality of a sewn product from deteriorating. It is to be.

According to a first aspect of the present invention, there is provided a full-rotary kettle in which bearing means for supporting a bobbin are provided on a stud which is provided to extend from the bottom of the inner kettle to the open end of the inner kettle. The bearing means has a straight cylindrical sleeve and a plurality of balls, the sleeve has an inner diameter larger than the outer diameter of the stud, and is provided so as to surround the stud. Fitted in a plurality of recesses formed at intervals in the circumferential direction at the base end of the stud, and fitted into a recess formed at one axial end of the sleeve so as to extend over the entire circumference in the circumferential direction. In the state, there is even a full rotation kettle characterized by being interposed between the stud and the sleeve. According to the invention, the studs of the inner bite include:
Since the bearing means for supporting the bobbin is provided, the bobbin is supported by the bearing means and can rotate smoothly and stably in the inner kettle. In addition, the bobbin can be supported so that the bobbin can be smoothly rotated even when the sewing operation is performed for a long time, and a change in the tension of the bobbin thread can be prevented. Therefore, it is possible to prevent the quality of the sewn product from deteriorating.

According to a second aspect of the present invention, there is provided a bobbin case of a full-rotation kettle in which bearing means for supporting the bobbin is provided on a cylindrical portion which stands upright from an end wall of the bobbin case toward an open end of the bobbin case. The bearing means has a sleeve on a right cylinder and a plurality of balls,
Each ball has an inner diameter larger than the outer diameter of the cylindrical portion and is provided so as to surround the cylindrical portion, and each ball fits into a recess formed at a base end portion of the cylindrical portion at a circumferential interval. A full-rotation kettle characterized in that it is interposed between the cylindrical portion and the sleeve in a state of being fitted in a concave groove formed at one end in the axial direction of the sleeve over the entire circumference in the circumferential direction. It is a bobbin case. According to the present invention, since the bearing means for supporting the bobbin is provided in the cylindrical portion of the bobbin case, the bobbin is supported by the bearing means and can rotate smoothly and stably in the inner kettle. In addition, the bobbin can be supported so that the bobbin can be smoothly rotated even when the sewing operation is performed for a long time, and a change in the tension of the bobbin thread can be prevented. Therefore, it is possible to prevent the quality of the sewn product from deteriorating.

[0007]

FIG. 1 is a cross-sectional view showing a vertical full rotation kettle 32 according to an embodiment of the present invention, FIG. 2 is a perspective view showing the vertical full rotation kettle 32, and FIG. FIG. 3 is an exploded perspective view showing the rotary hook 32. An inner circumferential surface of an outer kettle 34 attached to a lower shaft 29 that is driven to rotate about a horizontal rotation axis L10 perpendicular to the axis of a needle 28 that is reciprocally driven up and down and that rotates about the same axis L10 has A rail groove 35 extending in the circumferential direction is formed at 34 a, and the inner hook 30 is rotatably housed with respect to the outer hook 34 in a state in which the rail 36 formed on the outer peripheral surface 37 is fitted into the rail groove 35. ing. The inner hook 30 is provided with the detent member 38 in the detent recess 38.
9 is fitted and stopped. A bobbin case 31 is detachably attached to such an inner kettle 30,
In the bobbin case 31, the bobbin 40 around which the bobbin thread 62 is wound is housed. Thus, the bobbin 40 is housed in the inner kettle 30.

The inner kettle 30 has a peripheral wall 52 on which the rail 36 is formed, and a bottom 53 that partially closes one end of the peripheral wall 52 in the axial direction. A substantially column-shaped stud 55 protruding toward and extending along the axis of the peripheral wall 62 is provided upright.

The bobbin case 31 has a bobbin case main body (hereinafter, referred to as a body) comprising a substantially C-shaped peripheral wall 60 divided in the circumferential direction and an end wall 61 closing one axial end of the peripheral wall 60.
85), and the end wall 61
, A cylindrical tubular portion 80 protruding toward the open end of the main body 85 and extending along the axis of the peripheral wall 60 is provided upright.
A bobbin thread insertion hole 63 through which the bobbin thread 62 is inserted is formed in the peripheral wall 60 so as to penetrate in the thickness direction of the peripheral wall 60, and the bobbin thread insertion hole 63 resiliently contacts the outer peripheral surface 44 of the peripheral wall 60. A bobbin thread tension spring 65 for closing the hole 63 is provided. The bobbin thread tension spring 65 has a free end 65a.
Is configured so that the pressing force on the peripheral wall 60 can be adjusted.

The bobbin case 31 includes a latch 66,
The operation piece 6 whose one end in the longitudinal direction is connected to the latch 66
9 is provided. The latch 66 has a locking hole 74 and is provided on the end wall 61 of the main body 85 so as to be movable along one diameter line. With the bobbin case 31 attached to the inner kettle 30,
The stud 55 of the inner kettle 30 is inserted into the locking hole 74, and the periphery of the locking hole 74 is locked to the locking portion 68 of the stud 55, so that the bobbin case 31 is prevented from being removed from the inner hook 30.
The operating piece 69 can move the latch by performing an angular displacement operation, and by operating the operating piece 69, the latched state of the latch 66 to the stud 55 can be released. 30.

As described above, the peripheral wall 60 and the end wall 61 form a substantially cylindrical bobbin case main body 85 having a bottom. The main body 85, the bobbin thread tension spring 65, the latch 66, and the operation piece 69 , The bobbin case 31 is configured. Such a bobbin case 31 is made of steel or stainless steel, for example.

A bobbin 40 can be accommodated in the bobbin case 31. The bobbin 40 includes a pair of flanges 9.
0a, 90b and a cylindrical winding drum 91 connecting the flanges 90a, 90b. The bobbin 40 is housed in the bobbin case 31 in a state where the cylindrical portion 80 erected from the end wall 61 of the bobbin case main body 85 is inserted through the winding drum 91. The bobbin 40 is made of steel, stainless steel, aluminum, or synthetic resin, for example. The bobbin 40 includes flanges 90a, 90
The bobbin yarn 62 can be wound from the winding drum 91 to the vicinity of the outermost periphery of each of the flanges 90a and 90b between the positions b. The bobbin thread 62 wound around the bobbin 40 housed in the bobbin case 31 passes through the bobbin thread insertion hole 63 through the peripheral wall 6.
0, and is taken out between the peripheral wall 60 and the bobbin thread tension spring 65. When the sewing operation is started, the bobbin thread 62 rotates while the bobbin 40 rotates in the inner hook 30.
The bobbin thread tension spring 65 is pulled out under tension.

The cylindrical portion 80 of the bobbin case 31 in which the bobbin 40 is housed is provided with bearing means 100 for supporting the bobbin 40. The bearing means 100 includes a sleeve 101 and a plurality of balls 102 and 103. The sleeve 101 has a right cylindrical shape, has an inner diameter larger than the outer diameter of the cylindrical portion 80, and is provided so as to surround the cylindrical portion 80. Each ball 102 fits into a recess 105 formed at the base end of the cylindrical portion 80 at a circumferential interval, and is formed at one axial end of the sleeve 101 so as to extend over the entire circumference in the circumferential direction. It is interposed between the cylindrical portion 80 and the sleeve 101 in a state fitted in the concave groove 106. Each ball 103 fits into a concave portion 107 formed at a free end of the cylindrical portion 80 at a circumferential interval, and extends over the entire circumference in the other axial end of the sleeve 101. Is inserted between the cylindrical portion 80 and the sleeve 101 in a state fitted in the concave groove 108 to be formed.

Each of the balls 102 and 103 is provided in each of the recesses 10.
The sleeve 100 is rotatable within the rollers 5 and 107, and is guided by the balls 102 and 103 which are rotatable, so that the sleeve 100 can rotate smoothly around its axis with respect to the cylindrical portion 80. In such a bearing means 100, the retaining member 110 is fixed to the free end of the cylindrical portion 80, and is prevented from falling off from the cylindrical portion 80. The retaining member 110 has a ring shape, and the free end of the tubular portion 80 is press-fitted into the tubular portion 8.
Fixed to 0.

When the bobbin 40 is accommodated in the bobbin case 31 provided with the bearing means 100, the sleeve 101 of the bearing means 100 is mounted on the bobbin cylinder 91 of the bobbin 40.
It is inserted and supported inside. In this state, the sleeve 100
And can rotate around its axis integrally, and can smoothly rotate without forming an oil film by lubricating oil. As described above, the bobbin 40 can be smoothly rotated in the inner hook 30 by being supported by the bearing means 100. In addition, even if the sewing operation is performed for a long time, the bobbin 40 can be supported so that the bobbin 40 can smoothly rotate at a stable rotation speed, and the tension of the bobbin thread 62 can be prevented from changing. Seams can be formed. Therefore, it is possible to prevent the quality of the sewn product from deteriorating.

Further, since the bobbin 40 and the sleeve 101 of the bearing means 100 can rotate integrally, the bobbin drum 91 of the bobbin 40 and the sleeve 101 do not come into sliding contact with each other. Therefore, it is possible to prevent the bobbin 40 from being worn and the inner diameter of the winding drum 91 from becoming large, thereby preventing a gap from being formed between the winding drum 91 and the sleeve 101. Therefore, it is possible to prevent the gap from causing rattling of the bobbin 40 in the bobbin case 31 mounted on the inner kettle 30 and to prevent a change in the tension of the bobbin thread 62.

FIG. 4 is a cross-sectional view showing a vertical full rotation kettle 32a according to another embodiment of the present invention. The vertical full rotation kettle 32a has a configuration similar to that of the vertical full rotation kettle 32 shown in FIGS. Only parts having the configuration will be described. In this embodiment, the bobbin 4
The main body 85 of the bobbin case 31a in which 0 is stored has a peripheral wall 60 and an end wall 61a, and the end wall 61a does not have the tubular portion 80 formed in the above-described embodiment. The inner kettle 30a has a peripheral wall 52 on which the rail 36 is formed, and a bottom 53 that partially covers one end in the axial direction of the peripheral wall 52, and protrudes from the bottom 53 toward the open end of the inner kettle 30a.
A substantially cylindrical stud 55 extending along the axis of the peripheral wall 52
a is erected.

In this embodiment, the stud 55a of the inner hook 32a is provided with bearing means 100a for supporting the bobbin 40. The bearing means 100a includes a sleeve 101a,
A plurality of balls 102a and 103a are included. The sleeve 101a has a right cylindrical shape, has an inner diameter larger than the outer diameter of the stud 55a, and is provided so as to surround the stud 55a. Each ball 102a has a plurality of recesses 10 formed at the base end of the stud 55a at circumferential intervals.
5a, and is fitted between the stud 55a and the sleeve 101a in a state of being fitted into a concave groove 106a formed at one axial end of the sleeve 101a and extending over the entire circumference in the circumferential direction. Also each ball 1
A groove 03a is fitted in a recess 107a formed at a free end of the stud 55a at a circumferential direction at an interval in the circumferential direction, and is formed at the other end of the sleeve 101a in the axial direction over the entire circumference in the circumferential direction. It is interposed between the tubular portion 80a and the sleeve 101a in a state of being fitted into the sleeve 108a.

Each of the balls 102a and 103a is
05a, 107a, and is guided by the rollable balls 102a, 103a to form the sleeve 1a.
00a can rotate smoothly about its axis relative to stud 55a. Such a bearing means 100
In a, the retaining member 110a is fixed to the free end of the stud 55a to prevent the stud 55a from falling out of the cylindrical portion 80. The retaining member 110a has a ring shape, and the free end of the stud 55a is press-fitted and fixed to the free end of the stud 55a.

With the bobbin case 31a mounted on the inner hook 30a provided with the bearing means 100a, the bobbin 40 housed in the bobbin case 31a is provided with the sleeve 101a of the bearing means 100a and the bobbin 40 of the bobbin 40. 9
1 and is supported. In this state, bobbin 40
Can rotate smoothly around its axis integrally with the sleeve 100a. Thus, the bobbin 40 can be smoothly rotated in the inner hook 30a while being supported by the bearing means 100a. Even if the sewing operation is performed for a long time, the bobbin 40 can be supported so that the bobbin 40 can smoothly rotate at a stable rotation speed.
A change in the tension of the bobbin thread 62 can be prevented, and a uniform seam can be formed. Therefore, it is possible to prevent the quality of the sewn product from deteriorating.

Since the bobbin 40 and the sleeve 101a of the bearing means 100a can rotate integrally,
The winding drum 91 of the bobbin 40 does not slide on the sleeve 101a. Therefore, the bobbin 40 is worn, and
The inner diameter of the winding drum 91 and the sleeve 101
a can be prevented from being formed. Therefore, the bobbin case 3 with the gap being attached to the inner kettle 30a.
It is possible to prevent the bobbin 40 from rattling in the inside 1a and to prevent a change in the tension of the bobbin thread 62.

In still another embodiment of the present invention, the above-described bearing means 100a may be provided on a stud which is provided upright in a horizontal full rotation kettle, or may be provided on a vertical full rotation kettle 32a. In this case, the same effect as that of the case can be achieved.

[0023]

As described above, according to the first aspect of the present invention, the inner stud is provided with the bearing means for supporting the bobbin, so that the bobbin is supported by the bearing means.
It can rotate smoothly and stably in the inner hook. In addition, the bobbin can be supported so that the bobbin can be smoothly rotated even when the sewing operation is performed for a long time, and a change in the tension of the bobbin thread can be prevented. Therefore, it is possible to prevent the quality of the sewn product from deteriorating.

According to the second aspect of the present invention, since the bobbin case is provided with the bearing means for supporting the bobbin in the cylindrical portion of the bobbin case, the bobbin is supported by the bearing means and smoothly in the inner hook. Moreover, it can rotate stably. In addition, the bobbin can be supported so that the bobbin can be smoothly rotated even when the sewing operation is performed for a long time, and a change in the tension of the bobbin thread can be prevented. Therefore, it is possible to prevent the quality of the sewn product from deteriorating.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a vertical full rotation kettle 32 according to an embodiment of the present invention.

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

FIG. 3 is an exploded perspective view showing the vertical full rotation kettle 32. FIG.

FIG. 4 is a vertical full rotation kettle 32 according to another embodiment of the present invention.
It is sectional drawing which shows a.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 30 Inner bite 31 Bobbin case 32 Vertical full rotation bite 34 Outer bite 40 Bobbin 55, 55a Stud 80 Cylindrical part 100, 100a Bearing means 101, 101a Sleeve 102, 102a; 103, 103a Ball

Claims (2)

(57) [Claims] 1. A full-rotary kettle provided with bearing means for supporting a bobbin on a stud erected from the bottom of the inner kettle to the open end of the inner kettle, wherein the bearing means has a straight cylindrical shape. And a plurality of balls, wherein the sleeve has an inner diameter larger than the outer diameter of the stud, and is provided so as to surround the stud. Each ball is provided around a base end of the stud. The stud and the sleeve are fitted in a plurality of recesses formed at intervals in the direction and fitted in a groove formed extending over the entire circumferential direction at one end in the axial direction of the sleeve. A full rotation kettle characterized by being interposed between the two. 2. A full-rotation kettle bobbin case in which bearing means for supporting the bobbin is provided on a cylindrical portion that stands upright from the end wall of the bobbin case toward the open end of the bobbin case, A sleeve on a cylinder, and a plurality of balls, the sleeve has an inner diameter larger than the outer diameter of the cylindrical portion,
Each ball is provided so as to surround the cylindrical portion, and each ball fits into a recess formed at a base end portion of the cylindrical portion at an interval in the circumferential direction. A full-turn bobbin case, wherein the bobbin case is interposed between a tubular portion and a sleeve in a state of being fitted in a concave groove formed to extend over the circumference.