JPH0448799Y2 - - Google Patents

Description

[Detailed explanation of the idea]

【0001】

TECHNICAL FIELD The present invention relates to a horizontal full-rotation hook for a lockstitch sewing machine, and more particularly to a structure for providing lubricating oil to the outer hook raceway of the horizontal full-rotation hook.

【0002】

BACKGROUND ART A typical prior art is disclosed in, for example, Japanese Patent Publication No. 59-9195. In this prior art, a spindle 14 having a spiral groove is inserted and fixed in a cylindrical rotating shaft of an outer hook, and lubricating oil is guided through the groove by rotation of the outer hook. Centrifugal force guides the track of the inner hook into the track groove of the outer hook.

【0003】

[Problems to be solved by the invention] In such prior art, a spindle having a spiral groove is
It is inserted and fixed within the cylindrical rotating shaft of the outer hook, and the structure is obviously complicated. Furthermore, since the lubricating oil is forcibly supplied by the spiral groove,
The pressure of the supplied lubricating oil is relatively high, requiring an arrangement for returning excess oil to, for example, the bearings, which also complicates the arrangement.

[0004] The purpose of the present invention is to simplify the configuration,
Moreover, it is an object of the present invention to provide a horizontal full-rotation hook that can supply lubricating oil in an appropriate amount to the raceway of the outer hook.

【0005】

[Means for Solving the Problems] In the present invention, with the rail 4 of the inner hook 3 fitted into the raceway 2 of the outer hook 1, the outer hook 1 is rotationally driven around the vertical rotation axis 9, and the outer hook 1 is driven to rotate around the vertical rotation axis 9. The lower end 6 of the shaft 5 of the outer hook 1 is immersed in the lubricating oil 7 stored in the container 8, and as the outer hook 1 rotates around the vertical rotation axis 9, a lubricating oil formed coaxially with the shaft 5 is formed. In the horizontal full-rotation hook configured to supply lubricating oil 7 to the raceway groove 2 via the oil supply passage 12, the outer hook 1 has a radial direction extending upwardly from the lubricating oil supply passage 12. The lubricating oil supply passage 12 is formed with an outwardly inclined inclined surface 30.
The upper end 31 of the oil wick 12a inserted into the oil wick 12a is made to protrude, and the outer peripheral surface of the upper end 31 and the inclined surface 30 are spaced apart from each other, facing a space 32 surrounded by the inclined surface 30. A first guide passage 13, 24 is formed which opens at and extends radially outwardly.
The guide passages 13, 24 and the track groove 2 communicate with each other via another second guide passage 14, 21, 25, and the second guide passage 1 of the first guide passage 13, 24
4, 21, and 25, the first
First oil reservoir chambers 18, 20, 23 are formed that are recessed below the guide passages 13, 24, and the lower part 6 of the shaft 5
A lubricating oil introduction hole 10 that opens downward on the rotational axis 9 is formed in the lubricating oil introduction hole 10, which communicates with the lubricating oil introduction hole 10 and the lubricating oil supply passage 12, and is inclined radially outward as it goes upward. The lubricating oil supply passage 12 has a horizontal full-rotation hook formed therein, and a conical second oil reservoir chamber 12b is formed at the lower end of the lubricating oil supply passage 12.

【0006】

[Operation] According to the present invention, as the outer hook 1 is rotationally driven around the vertical rotation axis, the oil in the container 8 that has partially flowed into the oil feed passage 11 through the lubricating oil introduction hole 10 is The lubricating oil 7 is supplied to the oil supply passage 11
The oil rises due to the action of centrifugal force, is supplied to the second oil reservoir chamber 12b from the opening 11a of this passage 11, and is guided into the lubricating oil supply passage 12 formed coaxially with the shaft 5. It is impregnated into the core 12a and rises. In this way, the lubricating oil sucked up to the upper end 31 of the oil wick 12a is scattered radially outward by the action of centrifugal force. At this time, since the outer peripheral surface of the upper end portion 31 and the inclined surface 30 are spaced apart from each other, the lubricating oil sucked up can be scattered over the entire outer peripheral surface of the upper end portion 31. .
The lubricating oil thus scattered from the upper end 31 rises along the slope 30, and the first guide passage 1 opens facing a space 32 surrounded by the slope 30.
It flows into 3,24. In this way, the first passage 1
The lubricating oil that has flowed into the oil reservoir chambers 18 and 24 is
20, 23, and the second guide passage 1
It is supplied to the track groove 2 via 4, 21, and 25. In this way, the first oil sump chambers 18, 20, 23 are formed in the first guide passages 13, 24, so when the outer hook 1 stops and starts rotating again, the oil sump chambers 18, 20, 23 are formed in the first guide passages 13, 24. The oil stored in the groove 23 can be quickly guided to the track groove 2 via the second guide passages 14, 21, and 25. Thereby, it is possible to improve the supply speed of lubricating oil at the start of rotation of the outer hook, thereby improving responsiveness.

【0007】

Embodiment FIG. 1 is a sectional view showing an embodiment of the present invention. The outer hook 1 of the horizontal full-rotation hook of a lockstitch sewing machine has a track groove 2, and the inner hook 3 has a track groove 2.
The rail 4 of is fitted. The rotation of the inner hook 3 is prevented by a rotation preventing member, and the outer hook 1 is driven to rotate around a vertical axis. Outside hook 1
A shaft 5 having a vertical axis is integrally attached to the shaft 5, and a lower portion 6 of the shaft 5 is inserted into a container 8 storing lubricating oil 7 and immersed in the lubricating oil 7. On the rotational axis 9 of the shaft 5, a lubricating oil introduction hole 10 that opens downward is formed in the lower portion 6 of the shaft 5. From this lubricating oil introduction hole 10, an oil feed passage 11 is inclined radially outward as it goes upward.
is a series of The oil supply passage 11 is a lubricating oil supply passage 1 having a right cylindrical inner peripheral surface formed coaxially with the shaft 5.
Continuing to 2. A conical second oil reservoir chamber 12b is formed in this passage 12, and the oil supply passage 11 opens therein. An oil wick made of thread, felt, etc. is inserted into the passage 12. This lubricating oil supply passage 12
is connected to the first guide passage 13 for lubricating oil, which is formed in the hook bottom 34 of the outer hook 1 and extends in the radial direction.
Furthermore, this guide passage 13 includes the track groove 12.
and a second guide passage 1 that communicates with the first guide passage 13.
4 is formed. This passage 14 may be parallel to the axis 9 of the outer hook 1, or it may widen radially outward toward the top to facilitate the supply of lubricating oil by centrifugal force. good. The guide passage 14 is continuous with the track groove 2, and an oil wick may be provided in the guide passage 14.

[0008] In the middle of the lubricating oil guide passage 13, a screw member 15 including a protrusion 17 for adjusting the oil amount is provided, and constitutes an oil amount adjusting means 16. The amount of oil supplied to the passage 14 is adjusted according to the displacement of the protrusion 17 in the axial direction along the guide passage 13.

[0009] When the shaft 5 of the outer hook 1 is rotationally driven by a means such as a gear, the lubricating oil 7 in the container 8 is transferred from the introduction hole 10 to the oil supply passage 1 by its centrifugal force.
1 and enters the lubricating oil supply passage 12. This axis 5
Due to the rotation of the oil supply passage 11 and the lubricating oil supply passage 12, negative pressure is created, and lubricating oil continues to be introduced.
The lubricating oil moves up the oil wick 12 a along the inner peripheral surface of the supply passage 12 and enters the guide passage 13 . The lubricating oil in this guide passage 13 is further guided from the guide passage 14 to the track groove 2 through the oil amount adjusting means 16.

[0010] FIG. 2 is a cross-sectional view of another embodiment of the present invention. The lubricating oil supply passage 12 is formed in a right cylindrical shape coaxially with the vertical rotation axis 9, and at the upper end of this supply passage 12, an inclined surface 30 is formed that slopes radially outward as it goes upward. be done.
An upper end 31 of the oil wick 12a protrudes into a truncated conical space 32 surrounded by this inclined surface 30, and the outer peripheral surface of this upper end 31 and the inclined surface 3
It is separated from 0.

[0011] With such a configuration, the oil core 12a
The lubricating oil impregnated into the upper end 31 is scattered radially outward from the outer peripheral surface of the upper end 31 over the entire circumference due to the action of centrifugal force when the outer hook 1 rotates. As a result, for example, when no gap is formed between the inclined surface 30 and the outer peripheral surface of the upper end portion 31, that is, the first guide passage 13 is open facing the outer peripheral surface of the upper end portion 31. In contrast, only the oil scattered from the part facing the opening is supplied to the passage, whereas the first guide passage 1
It is possible to increase the amount of lubricating oil flowing into the tank. In other words, when the opening of the first guide passage 13 is close to the upper end 31, the upper end 31
Although the lubricating oil impregnated inside tends to move in the radial direction due to the action of centrifugal force, the portion where the lubricating oil can be scattered further outward from the outer peripheral surface of the upper end portion 31 is the first guide passage 13. Therefore, only half of the lubricating oil corresponding to the opening area of the first guide passage 13 is filled in the first guide passage 1.
It can flow into 3. On the other hand, by forming the inclined surface 30 and forming the space 32 between the outer peripheral surface of the upper end portion 31 and the inclined surface, the lubricating oil impregnated in the upper end portion 31 can be spread in the circumferential direction. There is no restriction over the entire circumference, and therefore the lubricating oil can be scattered radially outward from the entire circumference, and the thus scattered lubricating oil moves upward along the inclined surface 30 and closes the opening. It flows into the first guide passage 13 from there. In this way, by providing a space between the outer peripheral surface of the upper end portion 31 and the inclined surface 30, the efficiency of sucking up the lubricating oil impregnated in the oil wick 12a can be improved, and the first guide The amount of lubricating oil supplied to the passage 13 can be increased.

[0012] Also, in the vicinity of the intersection of the first guide passage 13 with the second guide passage 14, more specifically, in the vicinity of the protrusion 17 of the oil amount adjusting means 16 in the radial direction, a first guide A first oil reservoir chamber 18 recessed below the passage 13 is formed. By forming such an oil reservoir chamber 18, the inclined surface 3
The lubricating oil that has flowed into the first guide passage 13 from the first guide passage 13 is stored in the oil reservoir chamber 18, and the remaining oil is further supplied to the track groove 2 via the second guide passage 14. In this state, when the rotation of the outer hook 1 is stopped, lubricating oil is stored in the oil sump chamber 18, and therefore, when the outer hook 1 is rotated again, the oil sump chamber is The lubricating oil in 18 is quickly supplied to the raceway 2 via the second guide passage 14. By providing the oil reservoir chamber 18 in which the lubricating oil is stored in this manner, the movement path of the lubricating oil to the track groove 2 can be shortened, and the movement path of the lubricating oil to the raceway 2 can be shortened, and it can be almost At the same time, lubricating oil can be quickly supplied to the track groove 2. Thereby, the responsiveness of the lubricating oil supply rate during rotation of the outer hook can be significantly improved.

[0013] The inner circumferential surface of the lubricating oil supply passage 12 may be configured such that the inner diameter thereof increases upward in order to facilitate guiding of the lubricating oil by centrifugal force.

[0014] FIG. 3 is a cross-sectional view of a portion of another embodiment of the present invention. In this embodiment, a first oil reservoir chamber 20 is formed in the middle of the guide passage 13 of the outer hook 1, and lubricating oil is stored in this oil reservoir chamber 20. Therefore, immediately after the outer hook 1 starts rotating, the lubricating oil in the oil sump chamber 20 flows through the guide passage 21 to the raceway 2.
Get to 1 immediately. This makes it possible to constantly lubricate the track groove 2. Guide passage 21
has a shape that expands radially outward toward the raceway groove 2, whereby the lubricating oil is smoothly guided to the raceway groove 2 by centrifugal force.

[0015] FIG. 4 is a cross-sectional view of another embodiment of the present invention. Also in this embodiment, the guide passages 24, 2
5, a first oil reservoir chamber 23 for lubricating oil is formed in the outer hook 1 to ensure lubrication of the raceway 2 immediately after the outer hook 1 rotates.

【0016】

[Effect of the invention] As described above, according to the invention,
The outer hook has an inclined surface 3 which is connected to the lubricating oil supply passage 12 and which is inclined radially outward as it goes upward.
0, and the upper end 31 of the oil wick 12a is provided to protrude into the space 32 surrounded by the inclined surface 30, so that the lubricating oil impregnated into the oil wick 12a and rising up is At the upper end portion 31, by the action of centrifugal force due to the rotation of the outer hook 1, the particles can be scattered radially outward from the entire circumference of the upper end portion 31. With this, the oil wick 12a
The lubricating oil impregnated in the oil can be sucked up at a large flow rate, and therefore the amount of oil supplied to the first guide passages 13 and 24 can be increased. Also, the second guide passages 14, 2 of the first guide passages 13, 24
1 and 25, there is a first guide passage 1
Oil sump chambers 18, 2 recessed below than 3, 24
0, 23, even when the outer hook 1 is stopped, the oil sump chambers 18, 20,
Lubricating oil is stored in 23, thereby increasing the supply speed of lubricating oil to the raceway groove 2 when the outer hook 1 starts rotating again. As a result, even if the outer hook 1 is rotated at high speed and a large amount of lubricating oil is consumed, there is no risk of running out of the oil film, and lubrication can be achieved reliably.

[0017] Further, since a second oil reservoir chamber 12b is formed in the lower part 6 of the shaft 5, when the outer hook rotates, the opening 1 is
The lubricating oil sucked up through 1a can be once scattered into the second oil reservoir chamber 12b, thereby uniformly applying the lubricating oil to the end face of the oil wick 12a facing the second oil reservoir chamber 12. can be supplied. Therefore, it is possible to prevent the lubricating oil from being sucked up along a partial path within the oil wick 12a,
Stable oil supply can be maintained by reducing variations in the amount of oil supplied.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a portion of another embodiment of the present invention.

FIG. 4 is a cross-sectional view of yet another embodiment of the present invention.

[Explanation of symbols]

1... Outer hook 2... Raceway 3... Inner hook 4... Rail 5... Shaft 6... Lower part 7... Lubricating oil 8... Container 9... Axis line 10... Lubricating oil introduction hole 11... Oil feed passage 12...Lubricating oil supply passage 13, 14, 21, 24, 25...Lubricating oil guide passage 15...Bolt 16...Oil amount adjustment means 18, 20, 23...Oil reservoir chamber

Claims (1)

[Scope of utility model registration request] Claim 1: With the rail 4 of the inner hook 3 fitted into the track groove 2 of the outer hook 1, the outer hook 1 is driven to rotate around a vertical rotation axis 9, and the lower end of the shaft 5 of the outer hook 1 is rotated. Lubricating oil 7 in which part 6 is stored in container 8
The lubricating oil 7 is supplied to the raceway 2 through a lubricating oil supply passage 12 formed coaxially with the shaft 5 by rotation of the outer hook 1 about the vertical rotation axis 9. In the horizontal full-rotation hook, the outer hook 1 is formed with an inclined surface 30 that connects to the lubricating oil supply passage 12 and slopes radially outward as it goes upward, so that the lubricating oil supply passage 12
The upper end 31 of the oil wick 12a inserted into the oil wick 12a is made to protrude, and the outer peripheral surface of the upper end 31 and the inclined surface 30 are spaced apart from each other, facing a space 32 surrounded by the inclined surface 30. A first guide passage 13, 24 is formed which opens at and extends radially outwardly.
The guide passages 13, 24 and the track groove 2 communicate with each other via another second guide passage 14, 21, 25, and the second guide passage 1 of the first guide passage 13, 24
4, 21, and 25, the first
First oil reservoir chambers 18, 20, 23 are formed that are recessed below the guide passages 13, 24, and the lower part 6 of the shaft 5
A lubricating oil introduction hole 10 that opens downward on the rotational axis 9 is formed in the lubricating oil introduction hole 10, which communicates with the lubricating oil introduction hole 10 and the lubricating oil supply passage 12, and is inclined radially outward as it goes upward. A horizontal full-rotation hook characterized in that an oil supply passage 11 is formed, and a conical second oil reservoir chamber 12b is formed at the lower end of the lubricant supply passage 12.