JP2633492B2 - Horizontal full rotation kettle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal full rotation kettle originally provided in a sewing machine or the like, and more particularly, to a horizontal full rotation kettle configured to supply lubricating oil to a track groove of an outer kettle.

[0002]

2. Description of the Related Art A typical prior art is disclosed in, for example,
-27476. In this prior art, as shown in FIG. 6, a rotary shaft 33, which is driven to rotate around a vertical rotation axis L2 of a horizontal full rotation kettle 104, and an outer bite body 32 is fixed to an upper end portion, Inner kettle 10 rotatable relative to formed track groove 34
5, the oil passage 35 communicating from the rail groove 34 to the upper end of the rotary shaft 33, the oil passage 35, and the lower end surface 106 of the rotary shaft 33, and along the rotation axis L 2 of the rotary shaft 33. A storage hole 37 formed to extend and receive an oil core 36 that supplies lubricating oil upward by capillary action.
And an oil guide surface 38 formed in the lower end portion of the rotating shaft 33 and directly passing through the storage hole 37 and having an inner diameter that increases in an upward direction. The lubricating oil 108 is provided in the storage hole 37 by the oil guide surface. Of the rail groove 34 through the oil passage 35
The lubricating oil 108 is supplied to the

[0003]

In such prior art, the oil guide surface 38 formed at the lower end of the rotating shaft 33 is
Since it is formed in the shape of an inverted truncated cone whose inner diameter increases as it goes upward, a drilling tool such as a drill or a cutting tool is inserted into the storage hole 37 from the upper end of the rotating shaft 33 to the inside of the other end. In addition, the oil guide surface 38 in the shape of an inverted truncated cone must be formed with high precision, and the processing is troublesome. For this reason, there is a problem that productivity of the outer furnace 32 is low and manufacturing cost is high.

[0004] Accordingly, an object of the present invention is to improve the productivity and reduce the production cost by making it possible to process the oil guide surface for pumping the lubricating oil in the storage tank without requiring any trouble. Is to provide a horizontal full rotation kettle that can.

[0005]

According to the present invention, there is provided an outer hook having a rotary shaft which is driven to rotate about a vertical axis of rotation, and an outer hook having a rail groove into which a rail of the inner hook is formed, and lubricating oil. A storage tank that is stored and includes a lower end portion of the rotary shaft immersed in the lubricating oil, the outer kettle includes a shaft hole extending along the rotation axis within the rotary shaft, and an upper end of the shaft hole and a track groove. In a horizontal full rotary hook in which a communicating oil passage is formed, a fitting recess communicating with the shaft hole is formed at a lower end portion of the rotary shaft of the outer hook, and a fitting member is formed in the fitting recess. And an oil suction hole having an oil guide surface for pushing up the lubricating oil in the storage tank toward the shaft hole by rotation of the outer hook is formed in the fitting member. There is even a rotation.

[0006]

According to the present invention, a shaft hole extending in the axial direction is formed in the outer rotary shaft, and a fitting recess connected to the shaft hole is formed in a lower end portion of the rotary shaft. A fitting member is fitted into the fitting recess, and the fitting member has an oil suction hole having an oil guide surface for pumping lubricating oil in the storage tank toward the shaft hole by rotation of the outer hook. It is formed. Therefore, it is not necessary to directly form the oil guide surface in the shaft hole of the outer rotary shaft, and it is sufficient to form the oil guide surface in the fitting member. .

[0007]

FIG. 1 is a cross-sectional view of a horizontal full rotation kettle 1 according to an embodiment of the present invention. A horizontal full rotary hook 1 provided in a lockstitch sewing machine or the like has an outer hook 2 that is driven to rotate around a vertical rotation axis L1, and a track groove 3 is formed on the inner peripheral surface of the outer hook 2. A rail formed on the outer peripheral surface of the inner hook 40 is fitted into the rail groove 3, and the outer hook is rotated around the rotation axis L1 in a state where the rotation of the inner hook 40 is prevented. The outer kettle 2 has a rotating shaft 4, and a lower end 5 of the rotating shaft 4 is immersed in lubricating oil 7 stored in a storage tank 6.
The rotating shaft 4 is made of, for example, steel. On the outer periphery of the rotating shaft 4, an inner hook guide ring 8, an upper bearing 9, a gear 10
And the lower bearing 11 are fixed in this order from above to below. The gear 10 meshes with a gear fixed to a drive shaft of a motor (not shown). Thus, when the driving power is supplied to the motor, the rotation of the output shaft of the motor is transmitted to the rotating shaft 4 via the gear 10, and the rotating shaft 4 is driven to rotate around the rotating axis L1 in the rotation direction A. Therefore, the outer hook 2 is driven to rotate in the rotation direction A.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-II of FIG.
It is the expanded sectional view seen from I. Rotary shaft 4 of outer kettle 2
In the shaft hole 1 extending vertically along the rotation axis L1
6 are formed. The shaft hole 16 has a straight cylindrical fitting recess inner surface 43 which is perpendicular to the lower end surface 31 and a fitting recess inner surface 4.
3, a fitting recess 41 formed of a stepped surface 18 formed in an imaginary plane perpendicular to the rotation axis L1, a straight cylindrical inner cylindrical surface 19 continuous with the stepped surface 18, and an inner cylindrical surface 19 And an inclined surface 20 having an inverted truncated cone shape continuing upward. A first fitting member 42 is fitted into the fitting recess 41,
The fitting member 42 has a lower end surface 44 formed in a plane having the lower end surface 31 and a cylindrical surface 4 having the same diameter as the straight cylindrical fitting recess inner surface 43 which extends vertically from the outer peripheral portion of the lower end surface 44.
5, an upper end surface 46 formed in a plane having a stepped surface 18 that extends vertically from the upper portion of the cylindrical surface 45, and an inverted truncated cone-shaped oil guide whose inner diameter increases from the lower end surface 44 to the upper end surface 46. Surface 17.

In the above-mentioned prior art, the shaft hole 16 of the rotary shaft 4 is provided.
A drilling tool such as a drill or a cutting tool has to be inserted into the shaft hole from above to form the inverted truncated cone-shaped oil guide surface 17 inside the lower end of the rotating shaft 4. In this case, the length of the first fitting member 42 is about 1/6 of the length of the rotating shaft 4, and the working operation can be performed in a state where the first fitting member 42 is pulled out. A highly accurate oil guide surface 17 can be formed.

The upper opening of the shaft hole 16 is sealed by a lid 21. An oil core 22 made of thread, felt, or the like and extending from the vicinity of the step surface 18 to the vicinity of the inclined surface 20 is stored in the shaft hole 16. The lower end portion 23 of the oil core 22 is locked by the upper end surface 46 in a folded state, thereby preventing the oil core 22 from shifting downward.

With this configuration, when the outer kettle 2 is driven to rotate around the rotation axis L1, the oil guide surface 1
The lubricating oil 7 in the oil suction hole 47 surrounded by 7 is guided upward, supplied through the upper end surface 46 into the shaft hole 16 surrounded by the inner cylindrical surface 19, and further penetrated by the oil core 22. It rises to the inclined surface 20 by the action.

The principle of the rise of the lubricating oil 7 in the storage tank 6 will be described in further detail. The rotation of the rotary shaft 4 causes the oil suction hole 47 in the oil guide hole 17 surrounded by the oil guide surface 17 to rotate. The oil particles move radially outward due to the centrifugal force and collide with the oil guide surface 17. At this time, the oil guide surface 17 is formed so that the inner diameter increases as it goes upward, so that the oil particles that collide with the oil guide surface 17 rise along the oil guide surface 17. Become. In this way, the raised lubricating oil 7 is impregnated with the oil wick 22 and is sucked up by capillary action to be immersed in the oil wick 22.
Reaches the upper end portion 24 near the upper end 24, and further tries to rise along the inclined surface 20 by the action of centrifugal force.
1 prevents leakage to the outside. In this way, the lubricating oil 7 in the storage tank 6 can surely and stably rise in the shaft hole 16.

As described above, the inclined surface 20 of the shaft hole 16 is formed.
The lubricating oil 7 supplied to the rail groove 3 is supplied to the rail groove 3 via an oil passage 29 formed by a first passage 26 communicating with the inclined surface 20 and a second passage 28 formed in the peripheral wall 27. . One end of the first passage 26 opens into the inclined surface 20 and faces the internal space, and the other end of the first passage 26 is
7 is open to the outside and faces the outside. The upper end of the second passage 28 communicates with the rail groove 3, and the lower end of the second passage 28 communicates with the first passage 26. An internal screw is engraved radially outward of a position where the first passage 26 intersects with the second passage 28. An adjusting screw 30 is screwed into the inner screw. By advancing / retreating the adjusting screw 30, the opening area of the second passage 28 facing the first passage 26 changes. As a result, the second passage 26
The amount of the lubricating oil 7 supplied to the passage 28 can be adjusted.

As described above, the lubricating oil 7 in the storage tank 6 is reliably raised by the oil guide surface 17 so that the oil core 22
And the lubricating oil 7 impregnated in the oil core 22 rises by capillary action or the like, and can be reliably supplied to the rail groove 3 from the oil passage 29 formed by the first passage 26 and the second passage 28. Becomes The oil core 22 has an outer kettle 2
Since the lubricating oil 7 is always impregnated even when the lubricating oil 7 is stopped, as long as the lubricating oil 7 is sufficiently supplied to the lower end surface 31 of the rotating shaft 4, there is a possibility that the rail groove 3 may run out of oil. Absent. In this way, the lubricating oil 7 can be reliably supplied into the rail groove 3, so that the frictional force with the rail of the inner hook fitted in the rail groove 3 is reduced, and the outer hook 2 is smoothly rotated at high speed. can do.

FIG. 4 is a cross-sectional view of a part of a horizontal full rotation kettle 100 according to another embodiment of the present invention. In the horizontal full rotation kettle 100, portions corresponding to the horizontal full rotation kettle 1 are denoted by the same reference numerals, and description thereof will be omitted. The second fitting member 50 fitted in the fitting recess 41 has a lower end surface 51 formed in a plane having the lower end surface 31 of the rotating shaft 4, and a straight cylindrical shape which extends vertically from the outer peripheral portion of the lower end surface 51. A cylindrical surface 52 having the same diameter as the inner surface 43 of the fitting recess, an upper end surface 53 which extends vertically from the upper surface of the cylindrical surface 52 and is formed in a plane having the stepped surface 18, and a lower end surface 51 to an upper end surface 53. And an inner peripheral surface 54 as a straight cylindrical oil guide surface having an axis L3 shifted radially outward as it goes upward. The distance between the axis L3 and the vertical axis L1 increases as the axis L3 moves upward, and the oil suction hole 55 surrounded by the straight cylindrical inner peripheral surface 54 so as to have such an axis L3 has a second fitting. Joint member 50
Formed.

The principle that the oil suction hole 55 of the second fitting member 50 sucks the lubricating oil 7 will be described in more detail. The rotating shaft 4 on which the second fitting member 50 is fitted is driven to rotate in the rotation direction A. Then, the oil particles in the oil suction holes 55 surrounded by the inner peripheral surface 54 move radially outward by the centrifugal force and collide with the inner peripheral surface 54. At this time, since the inner peripheral surface 54 is formed to be inclined in a direction away from the center axis L1 as it goes upward, that is, inclined in a radially outward direction, the oil particles that collide with the inner peripheral surface 54 are It will rise along the inner peripheral surface 54. The lubricating oil 7 thus raised is impregnated in the oil core 22 and is sucked up by capillary action. Lubricating oil 7 sucked up to upper end 24 of oil core
As described in detail in the first fitting member 42, the inclined surface 20,
It is reliably supplied to the rail groove 3 via the first passage 26 and the second passage 28.

FIG. 5 is a cross-sectional view of a part of a horizontal full rotary hook 101 according to still another embodiment of the present invention. In the horizontal full rotation kettle 101, portions corresponding to the horizontal full rotation kettle 1 are denoted by the same reference numerals, and description thereof will be omitted. Fitting recess 41
The lower end surface 3 of the rotating shaft 4 is
1, a lower surface 61 formed on one plane, a cylindrical surface 62 which extends vertically from the outer peripheral portion of the lower surface 61 and has the same diameter as the inner surface 43 of the straight cylindrical fitting recess, and an upper portion of the cylindrical surface 62. An upper end surface 63 is formed in a plane that extends vertically from the upper surface and has the stepped surface 18, and a cylindrical inner peripheral surface 64 having the axis L <b> 1 from the lower end surface 61 to the upper end surface 63 in common. A spiral groove 65 as an oil guide surface extending from the lower end surface 61 to the upper end surface 63 is formed on the inner peripheral surface 64, and the spiral groove 65 rotates the lubricating oil 7 by rotating the rotary shaft 4 in the rotation direction A. Is formed in a shape that rises while rotating in the direction of pumping upward, that is, the direction opposite to the rotation direction A. Therefore, when the rotation shaft 4 is driven to rotate in the rotation direction A, the third fitting member 60 fitted to the rotation shaft 4 rotates, and the inner peripheral surface 64 is rotated.
The lubricating oil 7 in the oil suction hole 66 surrounded by the oil is pumped up to the upper end face 63 along the spiral groove 65. In this way, the lubricating oil 7 pumped up to the upper end surface 63 is impregnated into the oil core 22 and is sucked up by capillary action. The lubricating oil 7 sucked up to the vicinity of the upper end 24 of the oil core is, as described in detail in the first fitting member 42, the inclined surface 20 and the first passage 2.
6, is reliably supplied to the rail groove 3 through the second passage 28.

The first to third fitting members 42,
50 and 60 do not come into contact with the inner furnace 40, and therefore need not be formed of the same strong material as the outer furnace 2. Therefore, it may be formed of a light material, such as a synthetic resin or an aluminum alloy, which is not likely to corrode.

The lubricating oil 7 stored in the storage tank 6
For example, it has a viscosity of about 8 to 17 cSt. In particular, in winter or the like, before sewing starts, the temperature of the lubricating oil 7 in the storage tank 6 decreases, and the viscosity further increases. In order to guide the lubricating oil 7 having such a high viscosity without shortage of the lubricating oil supply to the track groove 3, FIGS.
It is configured as in the embodiment shown in FIG. 5, and a large pumping effect is generated by rotation of the outer kettle, and the viscosity is high,
Even lubricating oil that produces a large viscous resistance to the inner surfaces of all oil paths can be smoothly supplied to the rail groove 3 via the thin oil path 29.

[0020]

As described above, according to the present invention, a fitting recess connected to a shaft hole is formed at the lower end of the outer rotary shaft.
A fitting member having an oil suction hole is fitted into the fitting recess. Therefore, since the oil suction hole may be formed in the separately formed fitting member without forming the oil suction hole directly in the rotary shaft of the outer hook, the working operation is easy.

[Brief description of the drawings]

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

FIG. 2 is an enlarged cross-sectional view taken along a section line II-II in FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a cross-sectional view showing a part of a horizontal full rotation kettle 100 according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a part of a horizontal full rotation kettle 101 according to still another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a prior art horizontal full-rotation kettle 104.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal full rotation kettle 2 Outer hook 3 Track groove 4 Rotating shaft 5 Lower end surface 6 Storage tank 7 Lubricating oil 16 Shaft hole 17 Oil guide surface 18 Step surface 21 Lid 22 Oil core 26 First passage 28 Second passage 29 Oil passage 40 inner hook 41 fitting recess 42 first fitting member 50 second fitting member 60 third fitting member

Claims (1)

(57) [Claims] 1. A lubricating oil is stored in a lubricating oil having an outer shaft having a rotary shaft driven to rotate about a vertical rotational axis, a rail groove into which an inner rail is fitted, and a lubricating oil. A storage tank in which the lower end of the rotating shaft is immersed; a shaft hole extending along the rotation axis within the rotating shaft in the outer basket; and an oil passage communicating with the upper end of the shaft hole and the rail groove. In the horizontal full-rotation kettle, a fitting recess connected to the shaft hole is formed at the lower end of the rotary shaft of the outer hook, and a fitting member is fitted into the fitting recess. An oil suction hole having an oil guide surface which pushes up a lubricating oil in a storage tank toward a shaft hole by rotation of an outer kettle is formed in a member, and the horizontal full rotation kettle is characterized by the above-mentioned.