JPH0337589Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a horizontal full-rotation hook originally installed in a sewing machine, etc., and more specifically, a horizontal full-rotation hook configured to supply lubricating oil to the outer hook raceway. Regarding rotary hooks.

Conventional technology Typical prior art is, for example, Utility Model Application Publication No. 63-8882
is shown. In this prior art, a sewing machine has a hook shaft that can rotate around a vertical axis and has an outer hook fixed to its upper end, and an inner hook that can rotate relatively along a race groove formed in the outer hook. , a race groove oil supply hole formed in the outer hook and communicating from the upper end side of the hook shaft toward the race groove, and communicating the race groove oil supply hole and the lower end surface of the hook shaft; A communication hole formed to extend along the rotation axis of the hook shaft, a spiral groove formed on the inner peripheral surface of the communication hole and extending upward from the lower end surface of the hook shaft, and a inside of the machine frame of the sewing machine. a lubricating oil conductor that supplies lubricating oil from an oil source formed in the rotor to the lower end surface of the hook shaft, the lubricating oil from the oil source is guided to the communication hole by a spiral groove, and the lubricating oil is guided to the communication hole by the race groove oiling hole. The race groove is configured to supply lubricating oil to the race groove through the race groove.

Problems to be solved by the invention In such prior art, the machining work to form the spiral groove on the hook shaft is relatively labor-intensive, the manufacturing work is complicated, and the manufacturing cost is high. There was a problem.

Therefore, an object of the present invention is to provide a horizontal full-rotation hook that has a simple structure, can reliably supply oil to the outer hook raceway, and is easy to process and can be manufactured at low cost. That's true.

Means for Solving the Problems The present invention provides an oil guide hole that is disposed within the rotating shaft of the outer hook so that the axis of the oil guide hole, which is in contact with oil, is shifted radially outward relative to the rotating axis of the outer hook. It is a horizontal full-rotation hook that is characterized by guiding oil from an upper oil passage connected to the guide hole into the raceway of the outer hook.

Effect According to the present invention, an oil guide hole is formed over the entire length of the rotary shaft of the outer hook, the inner circumferential surface of which is shifted radially outward as it goes upward, and an oil passage connected to this oil guide hole is formed. As a result, the lubricating oil supplied into the oil guide hole of the outer hook rotating shaft is rotated around the rotational axis of the outer hook, and centrifugal force acts on the lubricating oil. It is guided toward the oil path side along the inner circumferential surface. The lubricating oil thus supplied into the oil passage is guided to the raceway of the outer hook by the action of centrifugal force accompanying the rotation of the outer hook. In this way, lubricating oil can be reliably guided from the oil guide hole to the rail groove via the oil path. Such an oil guide hole is much easier to work with than the prior art configuration in which a spiral groove is formed, and it is possible to improve productivity and reduce manufacturing costs.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention.
Horizontal full-rotation hook 1 for lockstitch sewing machines, etc.
has an outer hook 2 that is rotationally driven around a vertical rotational axis l1, and a raceway 3 is formed on the inner circumferential surface of the outer hook 2. A rail formed on the outer circumferential surface of the inner hook (not shown) is fitted into the raceway groove 3, and the outer hook is driven to rotate around the rotational axis l1 while the inner hook is prevented from rotating. The outer hook 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.

An inner hook guide link 8, an upper bearing 9, a gear 10, and a lower bearing 11 are fixed to the outer periphery of the rotary shaft 4 in this order from above to below. The gear 10 meshes with a gear fixed to a drive shaft of a motor (not shown). As a result, when 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 thus rotationally driven around the rotational axis l1. Then, the outer hook 2 is driven to rotate.

FIG. 2 is an enlarged sectional view taken from the section line - in FIG. 1, and FIG. 3 is an enlarged sectional view taken from the section line - in FIG. 1.
It is an enlarged sectional view seen from. In the rotation shaft 4 of the outer hook 2, there is an oil guide hole 16 having an axis l2 inclined at an angle θ with respect to the rotation axis l1.
is formed. The inner peripheral surface 17 of this guide hole 16 is
It is formed into a right cylindrical shape centered on the axis l2. Since such a guide hole 16 can be easily drilled in the rotating shaft 4 using a drill or the like, the machining operation can be simplified and productivity can be improved.

The upper opening of the guide hole 16 is sealed with a lid 21 . The inside of the guide hole 16 is made of thread, felt, etc., and the lower end 23 of this oil wick 22 is
In the folded state, it resiliently abuts against the inner circumferential surface 17. This prevents the oil wick 22 from shifting downward.

With such a configuration, when the outer hook 2 is rotationally driven around the rotation axis l1, the inner peripheral surface 1
The lubricating oil 7 in the storage tank 6 is guided upward by the lubricating oil 7 and rises to the inclined surface 20 by the permeation action of the oil wick 22.

To explain in more detail the principle by which the lubricating oil in the storage tank 6 rises, when the rotating shaft 4 is rotationally driven, oil particles in the guide hole 16 surrounded by the inner circumferential surface 17 rise. , moves radially outward due to centrifugal force and collides with the inner circumferential surface 17.
At this time, since the inner circumferential surface 17 is formed to shift outward in the radial direction as it goes upward, as a result, the oil particles that collide with the inner circumferential surface 17 rise along the inner circumferential surface 17. It turns out. Further, the lubricating oil below the oil level 31 is impregnated by the oil wick 22 and is sucked up by capillary action to the upper end 24 of the oil wick 22.
Although it reaches the vicinity and tries to rise further along the cylindrical surface 20 due to the action of centrifugal force, the lid body 2
1 prevents leakage to the outside. In this way, the lubricating oil in the storage tank 6 can rise inside the guide hole 16 reliably and stably.

As described above, the lubricating oil supplied to the cylindrical surface 20 of the guide hole 16 flows into the first passage 26 formed in the bottom 25 of the outer hook 2 and the second passage 28 formed in the peripheral wall 27. The oil is supplied to the track groove 3 through the oil passage 29 constructed in this manner. Said first passage 2
One end of the first passage 26 opens to the inclined surface 20 and faces the internal space thereof, and the other end of the first passage 26 opens to the outer peripheral surface of the peripheral wall 27 and faces the outside. Further, the upper end of the second passage 28 communicates with the track groove 3, and the lower end of the second passage 28 communicates with the first passage 26. An internal thread is formed radially outward from the position where the first passage 26 intersects with the second passage 28 . An adjustment screw 30 is screwed into this internal thread. By screwing the adjustment screw 30 forward/backward,
The opening area of the second passage 28 facing the first passage 26 changes. Thereby, the amount of lubricating oil supplied from the first passage 26 to the second passage 28 can be adjusted.

As described above, the lubricating oil 7 in the storage tank 6 is
The lubricating oil is reliably raised by the oil guide hole 16, and is impregnated by the oil wick 22. The lubricating oil impregnated into the oil wick 22 rises by capillary action,
It becomes possible to reliably supply oil to the track groove 3 from the oil passage 29 constituted by the passage 26 and the second passage 28. Note that since the oil wick 22 is always impregnated with lubricating oil even when the outer hook 2 is stopped, the oil wick 22 is always impregnated with lubricating oil, so that the storage tank 6
As long as a sufficient amount of lubricating oil is supplied so that the oil level 32 of the lubricating oil 7 is upward, there is no risk of oil running out in the raceway 3. In this way, lubricating oil can be reliably supplied into the raceway 3, reducing the frictional force between the inner rotor and the raceway that fits into the raceway 3, allowing the outer rotor 2 to rotate smoothly at high speed. be able to.

Effects of the invention According to the invention, an oil guide hole is provided in the rotating shaft of the outer hook, so that the lubricating oil can be reliably absorbed, for example, when the lower end is immersed in the lubricating oil in the storage tank. It can lead you upwards. Moreover, such oil guide holes can be easily formed using, for example, a drill, so machining operations are easy, productivity is improved, and manufacturing costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken from the cutting plane line - in Fig. 1, and Fig. 3 is an enlarged sectional view taken from the cutting plane line - in Fig. 1. It is a diagram. 1...Horizontal full rotation hook, 2...Outer hook, 3...
Track groove, 4... Rotating shaft, 16... Storage hole, 17...
Oil guide surface, 18... Step surface, 19... Inner cylinder surface, 2
0... Inclined surface, 22... Oil wick, 26... First passage, 28... Second passage, 29... Oil passage.

Claims (1)

[Scope of Claim for Utility Model Registration] An oil guide hole is provided within the rotating shaft of the outer hook so that the axis of the oil guide hole in contact with the oil is shifted radially outward as it moves upwards with respect to the rotating axis of the outer hook. A horizontal full-rotation rotary hook is characterized in that the oil in the upper oil passage connected to the guide hole is guided to the raceway of the outer rotary hook.