JPH0736638Y2 - Full rotary hook structure of sewing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention supports an outer hook at the end of a lower shaft in a sewing machine, and rotates an inner hook containing a bobbin inside the outer hook to rotate the outer hook. This relates to the structure of a full-rotary hook of a sewing machine, which is rotatably supported so that it can remain stationary even inside. In particular, it is possible to forcibly supply lubricating oil to the lower shaft by a pump, as in an industrial sewing machine with a high rotation speed. The present invention relates to a full rotary hook structure in a sewing machine of the type described above.

[Conventional technology]

In the industrial sewing machines mentioned above, the needle is
Since it reciprocates about 5500 times, each part that performs an operation related to the operation of this needle will rotate up to about 11000 times. Therefore, unless the lubricating oil is forcibly supplied to the bearings at such high-speed rotating locations by a pump, the members may overheat and seize or wear.

By the way, since the full-rotary hook structure of the sewing machine is generally for hooking the lower thread on the upper thread through which the needle is inserted, the inner hook containing the bobbin wound with the lower thread has a needle. Although it remains stationary despite the reciprocating movement of the needle, the outer hook having the hook for hooking the upper thread rotates at a high speed in association with the reciprocating movement of the needle.

Therefore, it is necessary to supply lubricating oil to the sliding surface of the inner hook that slides relatively to the outer hook, but this lubricating oil is conventionally formed on the lower shaft that supports the outer hook. The oil was supplied from the existing lubricating oil passage to the race surface of the inner kettle through another lubricating oil passage formed in the outer kettle.

First, referring to FIG. 3, a conventional one having a full-rotary rotary hook structure in such a sewing machine will be described.

In FIG. 3, a lower shaft 1 that can be rotated at a high speed by a driving means such as a motor (not shown) is provided, and the lower shaft 1 is provided with a pair of metal members 2 that are arranged at intervals in the axial direction. Axial movement is restricted and supported by a thrust receiver 3 (only one shown). A first lubricating oil passage 4 that extends in the axial direction is formed in the center of the lower shaft 1. Inside the first lubricating oil passage 4, a base end side of the lower shaft 1 (not shown) is formed. The lubricating oil can be supplied from.

An outer hook 5 is fixed to the tip of the lower shaft 1. The outer pot 5 has a disk-shaped base 6 fitted to the outer periphery of the tip of the lower shaft 1 and a substantially cylindrical outer pot main body 10 connected to the tip side of the base 6. The base 6 has a central hole 7 into which the tip of the lower shaft 1 can be inserted relatively densely. Further, the base 6 is formed with a radial screw hole 8 that communicates with the central hole 7 from the outer peripheral surface 6a thereof. A screw 9 is screwed into the screw hole 8 to attach the tip of the screw 9 to the base hole. The outer hook 5 can rotate integrally with the lower shaft 1 by being pressed against the outer peripheral surface 1a of the lower shaft 1.

The outer pot main body 10 has a substrate 11 that is concentrically projected at the tip of the base 6 and has a diameter larger than that of the base 6, and a substantially cylindrical outer peripheral wall 12 that is connected to the tip side of the substrate 11. A relatively thin hook member 13 is attached to the outer peripheral surface 12a of the outer peripheral wall 12 by a screw (not shown). Further, an annular guide groove 14 is formed on the inner peripheral surface of the outer peripheral wall 12 of the outer hook 5.

An inner pot 16 which is rotatable relative to the outer pot 5 is provided in the inner space 15 of the outer pot 5. The inner pot 16 is formed in a substantially cylindrical shape as a whole, and the outer peripheral surface 16a of the inner pot 16 is fitted into the guide groove 14 of the outer pot 5 and is relatively circumferentially arranged. Guide ring that can slide around
17 is laid around except for the part where the thread comes out. A support plate 18 is attached integrally to the base end portion of the inner pot 16 in the axial direction of the inner pot 16 at the center of the support plate 18 in the longitudinal direction. Support pins extending to 19
Are projected coaxially. A bobbin (not shown) wound with a bobbin thread is attached to the support pin 19.

A circular concave portion 20 communicating with the central hole 7 and having a diameter larger than that of the central hole 7 is formed in the base plate 11 of the outer hook main body 10 of the outer hook 5. The second extending
The lubricating oil passage 21 is in communication. This second lubricating oil passage 21
Are formed in the substrate 11 so as to extend substantially in the radial direction and communicate with the circular recess 20 in the radial passage 22.
And an axial passage 23 formed so as to communicate with the outer end of the radial passage 22 and extend substantially in the axial direction from the substrate 11 to the outer peripheral wall 12.

The tip of the axial passage 23 reaches the vicinity of the guide groove 14, and the circular outer chamber communicating with the guide groove 14 and the axial passage 23 is formed in the outer peripheral wall 12 at this portion. 24 are formed. In addition, this excess chamber 24,
It is opened to the outer peripheral surface 12a of the outer peripheral wall 12 and is openably and closably covered by a lid body (not shown).
Then, in the excess chamber 24, an excess member made of fibers made of felt or the like hardened like a non-woven fabric is stored.

On the other hand, at the tip of the lower shaft 1, a holding sleeve 27 holding a passing member 26 which is an oil amount limiting member for limiting the amount of oil.
Is to be installed. This retaining sleeve 27
Is a sleeve main body 28 having a threaded portion formed on the outer peripheral surface which is screwed into a screw portion (not shown) formed on the inner peripheral surface forming the first lubricating oil passage 4 of the lower shaft 1, and the sleeve main body 28. A flange 29 having a diameter larger than that of the first lubricating oil passage 4 is continuously provided. The flange 29 has a communication hole 30 for communicating the inside of the sleeve body 28 and the circular recess 20.
Are formed. At the inner end of the sleeve body 28, a recess 31 is formed which communicates with the communication hole 30 and has a small-diameter frustoconical shape on the communication hole 30 side. The excess member 26 mounted in the sleeve body 28 is formed into a columnar shape having the inner diameter of the sleeve body 28 substantially the same as the nonwoven fabric made by fixing the fibers made of felt or the like.

The material may be polyester, a sintered material or the like as long as it has a cushioning effect.

Next, the operation of the conventional one having the above-mentioned configuration will be described.

While the lower shaft 1 rotates at a high speed with the outer hook 5 and sewing is performed by a needle (not shown), lubricating oil is supplied at high pressure into the first lubricating oil passage 4 of the lower shaft 1 by a pump (not shown). It is like this.

By the way, the high-pressure lubricating oil remains as it is in the guide groove 14 of the outer pot 5.
If it is sprayed from the cloth, the cloth being sewn will be contaminated with the lubricating oil. However, the excessive member 26 is disposed in the first lubricating oil passage 4, and the lubricating oil passes through the excessive member 26. Due to the resistance of the excess member 26 at the time of running, the oil pressure and the oil amount of the lubricating oil passing through the excess member 26 are reduced. Then, when passing through the radial passage 22 of the outer pot main body 10 rotating at a high speed, the lubricating oil is accelerated to some extent by centrifugal force, and an appropriate amount of lubricating oil is supplied from the guide groove 14 of the outer pot 5. 16
Will be supplied to the guide protrusions 17 of.

[Problems to be solved by the device]

By the way, foreign matter such as cloth waste of sewing products and various abrasion powders may be mixed in the lubricating oil, but since these foreign matter are passed by the excessive member 26, the excessive member 26 is used for a long period of time. If it continues, the excess member 26 will be clogged and the lubricating oil will not be supplied to the guide protrusion 17 of the inner pot 16. Then, the outer pot 5 and the inner pot
16 may generate heat, burn, or wear to cause rattling.

Therefore, if such an accident occurs, the outer hook 5, the inner hook 16, and the excess member 26 must be replaced.
In order to replace the excess member 26, the holding sleeve 27 must be removed, which is troublesome. In addition, the user
Often, only the outer hook 5 and the inner hook 16 are replaced without replacing 26. Then, even if the operation is restarted, the excess member 26 is still in the clogged state, so that the accidents of the outer hook 5 and the inner hook 16 may occur again in a short period of time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a full-rotary hook structure for a sewing machine, which overcomes the above-mentioned problems in the conventional art and allows the oil amount limiting member to be easily replaced.

[Means for Solving the Problems]

The full rotary hook structure of the sewing machine according to the present invention for achieving the above-described object has a first lubricating oil passage in which a lubricating oil is forcibly supplied by a pump, which is formed inside and is externally attached to an end of a lower shaft which is rotationally driven. The inner hook, which supports the hook and accommodates the bobbin inside the outer hook, is rotatably supported with respect to the outer hook, communicates with the first lubricating oil passage, and extends in the radial direction of the lower shaft. Forming a radial passage and an axial passage communicating with the radial passage and extending in the axial direction of the lower shaft in the outer pot, the second lubricating oil passage including the radial passage and the axial passage. In the full-rotary hook structure of the sewing machine in which the lubricating oil is supplied to the sliding surface with the inner hook by means of the first oil quantity limiting member which also serves as a filtering member by limiting the amount of the lubricating oil supplied into the radial passage. And the supply of lubricating oil into the axial passage. And a second oil amount limiting member which also functions as a filtering member is provided, and an openable and closable opening communicating with the outside for mounting and dismounting the first oil amount limiting member is formed in the outer pot. There is.

[Action]

According to the present invention having the above-described configuration, the first oil amount limiting member and the second oil amount limiting member are arranged in the second lubricating oil passage formed in the outer pot, so that when the outer pot is replaced, Both oil amount limiting members can be exchanged without exception, and since only the first oil amount limiting member can be exchanged without exchanging the outer pot, the oil can be easily mixed in the lubricating oil due to the forced lubrication by the pump. It is possible to easily replace the first oil amount limiting member, which will filter most of the foreign matter.

〔Example〕

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings. It should be noted that the same or corresponding configurations as those of the above-described conventional one are denoted by the same reference numerals in the drawings, and only the main parts will be described.

FIG. 1 shows a first embodiment of a full rotary hook structure of a sewing machine according to the present invention, in which an end of a lower shaft 1 is provided with a tip of a screw 9 screwed to a base 6 of an outer hook 5. It is fixed by being pressed against the outer peripheral surface 1a of the lower shaft 1. The outer hook body 10 of the outer hook 5 has a large-diameter second lubricating oil passage communicating with the circular recess 20.
21 radial passages 22 are formed. An opening 32 communicating with the outside of the outer pot 5 is formed in the outer pot main body 10 on the extension of the radial passage 22 beyond the portion where the radial passage 22 communicates with the axial passage 23. 32 and the axial passage
The radial passage 22 in the vicinity of 23 is formed to have a larger diameter than the radial passages 22 of other parts via the step portion 33.
Further, a screw portion (not shown) is formed on the inner peripheral surface of the opening 32. The radial passage near the stepped portion 33
A holding sleeve 27 that holds a passing member 26, which is an oil amount limiting member for limiting the amount of oil, is mounted inside the container 22.

The holding sleeve 27 has a sleeve main body 28 having a threaded portion formed on the outer peripheral surface to be screwed into a threaded portion (not shown) formed on the inner peripheral surface of the radial passage 22 below the step portion 33, and this sleeve. The stepped portion 33 is connected to the main body 28 and is constituted by a flange 29 having substantially the same diameter, and the flange 29 is provided with a communication hole 30 that connects the inside of the sleeve main body 28 and the axial passage 23. Has been formed. In addition, the inner end of the sleeve body 28 communicates with the communication hole 30, and the communication hole 30
A concave portion 31 having a truncated cone shape with a small diameter on the side is formed. The excess member 26 mounted in the sleeve body 28 is formed into a columnar shape having the inner diameter of the sleeve body 28 substantially the same as the nonwoven fabric made by fixing the fibers made of felt or the like.

The material may be polyester, a sintered material or the like as long as it has a cushioning effect.

Further, a screw 34 forming a lid is screwed into the opening 32, and the screw 34 prevents leakage of lubricating oil.

According to the above-mentioned structure, the lower shaft 1 is driven by the pump (not shown).
The amount of lubricating oil supplied to the first lubricating oil passage 4 of the second lubricating oil passage 21 of the outer pot 5 is set by the passing member 26 which is an oil amount limiting member disposed in the radial passage 22 of the second lubricating oil passage 21. And the hydraulic pressure is reduced, and the axial passage 23 of the second lubricating oil passage 21
After being introduced into the excess chamber 24 via the over-passage member 25, foreign matter is again passed by the excess member 25, and then the foreign matter is supplied from the guide groove 14 to the guide protrusion 17 of the inner pot 16. Will contribute to the lubrication of the sliding surface between them.

Then, when the excess member 26 is used for a long period of time, the excess member 26 is clogged with foreign matter, and the lubricating oil is removed from the inner pot 16
Will not be supplied to the guide protrusion 17 of. Then,
The outer pot 5 and the inner pot 16 may generate heat, seize, or wear to cause looseness. However, if you notice such an accident, replace the outer pot 5 and the inner pot 16 with each other. For example, since the new outer pot 5 is preliminarily fitted with the new over-member 26, the replacement of the outer pot 5 also automatically replaces the over-member 26. Therefore, after the outer hook 5 and the inner hook 16 are replaced, the lubricating oil is supplied to the guide protrusion 17 of the inner hook 16 by the new over-member 26, so that the life of the outer hook 5 and the inner hook 16 is extended. can do.

On the other hand, before the above-mentioned accident in which the outer pot 5 and the inner pot 16 generate heat, are seized, or are worn to cause rattling, the screw 34 is regularly removed to replace the excess member 26 with a new one. If replaced, the life of the outer hook 5 and the inner hook can be further extended.

As described above, according to this embodiment, the over-member 26 is automatically replaced every time the outer pot 5 is replaced, and
Since it is possible to replace only the excess member 26 alone,
The over-member 26 can be easily replaced, and therefore the service lives of the outer hook 5 and the inner hook 16 can be extended.

FIG. 2 shows a second embodiment of the full-rotary hook structure of the sewing machine according to the present invention.
A threaded portion (not shown) that can be screwed into the threaded portion of the opening 32 is formed on the outer periphery of the holding sleeve that holds the
A screw head 35 is formed on the top of the retaining sleeve. That is, in this embodiment, the holding sleeve 27 and the screw 34 in the first embodiment described above are integrated to reduce the number of parts.

With such a configuration, the over-member 26 is automatically replaced every time the outer pot 5 is replaced, and it is also possible to replace only the over-member 26 by itself. 26 can be easily replaced, and the life of the outer hook 5 and the inner hook 16 can be extended.

As described above, according to this embodiment, the same effect as that of the above-described embodiments can be obtained.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

[Effect of device]

As described above, according to the present invention, both oil amount limiting members can be easily replaced in connection with the replacement of the outer pot,
Since it is possible to easily replace only the oil amount limiting member having a large filtration amount, it is possible to prolong the service life of the outer pot and the inner pot.

[Brief description of drawings]

1 and 2 are longitudinal sectional views of essential parts showing an embodiment of a full-rotary rotary hook structure of a sewing machine according to the present invention, and FIG. 3 is a vertical sectional view of essential parts showing a full-rotary rotary hook structure of a conventional sewing machine. It is a figure. 1 ... Lower shaft, 4 ... 1st lubricating oil passage, 5 ... Outer pot, 6 ... Base part,
9 ... Screw, 10 ... Outer hook main body, 14 ... Guide groove, 16 ... Inner hook, 17
... guide projection, 20 ... circular recess, 21 ... second lubricating oil passage, 22
… Radial passages, 23… Axial passages, 24… Excess chambers, 25,26
… Over member, 27… Retaining sleeve, 32… Opening, 34… Screw.

Claims (1)

[Scope of utility model registration request] 1. A first pump forcibly supplying lubricating oil
A lubricating oil passage is formed inside to support the outer hook on the end of the lower shaft that is driven to rotate, and the inner hook containing the bobbin inside the outer hook is supported so as to be rotatable relative to the outer hook. A radial passage communicating with the first lubricating oil passage and extending in the radial direction of the lower shaft; and an axial passage communicating with the radial passage and extending in the axial direction of the lower shaft, in the outer pot. In the full rotary hook structure of the sewing machine, which is formed so as to supply the lubricating oil to the sliding surface with the inner hook by the second lubricating oil passage formed of the radial passage and the axial passage, A first oil amount limiting member which limits the amount of lubricating oil supplied and also serves as a filtering member, and a second oil amount limiting member which also serves as a filtering member and limits the amount of lubricating oil supplied in the axial passage. Disposed and communicates with the outside in order to mount and dismount the first oil amount limiting member. Rotary hook structure of the sewing machine, characterized in that the closing can be opened and formed in the outer holder.