JP2010063740A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent leakage of a lubricant from an air outlet while reducing the cost by reducing the number of processed positions and the number of parts. <P>SOLUTION: A through hole 4h penetrating into a lubricant chamber from outside of a sewing machine frame 1 is formed on a wall 4b facing a worker in the lubricant chamber 4 of the sewing machine 100, and a plug member 7 for plugging the through hole is disposed in the through hole. The plug member includes: a plug body 71; a through hole 73 formed in the plug body to communicate with inside of the lubricant chamber; the air outlet 74 opened upward and formed to penetrate from the outside of the plug body toward the through hole to make the through hole communicate with the outside of the sewing machine frame; an oil feed hole 75 formed in the plug body to continue to the through hole and to make the through hole communicate with outside of the sewing machine frame to introduce the lubricant into the lubricant chamber; and a lid 76 detachably attached to the oil feed hole to prevent the outflow of the lubricant from the oil feed hole to the outside of the sewing machine frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sewing machine having a sealed lubricating chamber for storing lubricating oil supplied to a drive mechanism.

  In a sewing machine that rotates at high speed, lubricating oil is used to prevent seizure of the drive mechanism such as a gear and a cam and to suppress heat generation of the drive mechanism. Since it is not preferable that the lubricating oil touches the cloth or thread used for sewing, a lubricating chamber for storing the lubricating oil is generally provided. The lubrication chamber is a sealed space and is sealed with an oil seal, packing, or the like so that the lubricating oil does not leak to the outside. The drive mechanism is housed in the lubrication chamber, and some parts such as gears are immersed in the lubricating oil. Then, when the parts such as gears immersed in the lubricating oil perform operations such as rotation, the lubricating oil is wound up and applied to the drive mechanism. Thereby, lubricating oil can be supplied over the whole drive mechanism in a lubrication chamber, and seizing and heat_generation | fever can be prevented (for example, refer patent document 1).

Heat generated by friction or the like in the drive mechanism is cooled by the lubricating oil. However, since the lubrication chamber is a sealed space, the heat is trapped. When the temperature in the lubrication chamber becomes higher than the outside temperature, the air in the lubrication chamber expands and the internal pressure in the lubrication chamber becomes higher than the outside. As a result, the lubricating oil leaks outside the lubrication chamber over the oil seal and packing.
In order to prevent such a pressure difference, as shown in FIG. 9, an air vent member 103 is inserted into a through-hole 102 that communicates between the lubrication chamber 101 and the outside, on the wall surface of the lubrication chamber 101. It is fixed. As shown in FIG. 10, the air vent member 103 is formed with air vent holes 104 that open to the lubrication chamber 101 side and the outside of the sewing machine. Here, the opening on the outer side of the sewing machine in the air vent hole 104 is formed so as to open upward in order to prevent the lubricating oil 110 from leaking. An oil supply hole 105 for supplying oil into the lubrication chamber 101 is formed in the vicinity of the air vent member 103 on the wall surface of the lubrication chamber 101. A rubber plug 106 is detachably provided in the oil supply hole 105, and the rubber plug 106 is fitted into the oil supply hole 105 except when oiling.
Also known is a mechanism that performs air venting and refueling at the same location. Specifically, as shown in FIGS. 11 and 12, one through hole 203 is formed in the wall surface of the lubrication chamber 202 of the sewing machine 201, and a rubber plug 204 is detachably fitted into the through hole 203. The rubber stopper 204 is formed with an air vent hole 205 that communicates from the inside of the lubricating chamber 202 in which the lubricating oil 210 is stored to the outside of the sewing machine. Thereby, the function as an air vent member and a plug member of an oil supply hole can be given with one rubber plug 204.
JP 2001-314684 A

However, in the former example shown in FIGS. 9 and 10, it is necessary to form the through hole 102 and the oil supply hole 105 in the wall portion of the lubrication chamber 101, and the air vent member 103 and the rubber plug 106 are required. . For this reason, the number of parts to be processed and the number of parts increase, and the cost increases.
Further, in the latter example shown in FIGS. 11 and 12, the air vent hole 205 can be formed only in the axial direction in the process of integrally forming the rubber stopper 204. The lubricating oil 210 sometimes leaks from the air vent hole 203 during the undulation operation.

  Accordingly, the present invention has been made to solve the above problems, and provides a sewing machine that can prevent the leakage of lubricating oil from the air vent hole while reducing the cost by reducing the number of processing parts and the number of parts. The purpose is to do.

The invention described in claim 1
Sewing machine frame (1);
A lubrication chamber (4) provided in a lower portion of the sewing machine frame and storing lubricating oil (5);
In a sewing machine (100) comprising: a drive mechanism (10) that operates by driving of a drive source and is at least partially immersed in the lubricating oil in the lubrication chamber.
A through hole (4h) that penetrates the lubrication chamber from the outside of the sewing machine frame is formed in the wall portion (4b) facing the operator in the lubrication chamber, and the plug member that closes the through hole is formed in the through hole. (7, 7a, 7b, 7c, 7d, 7e) are provided,
The plug member is
A plug body (71);
Communication holes (73, 80, 83, 86) formed in the plug body and communicating with the lubrication chamber;
An air vent hole (74, 91) that is formed so as to penetrate from the outer peripheral side of the stopper main body toward the communication hole, communicates the communication hole and the outside of the sewing machine frame, and opens upward.
An oil supply hole (75, 75a, 90) that is formed in the stopper body so as to be continuous with the communication hole, communicates the communication hole with the outside of the sewing machine frame, and guides lubricating oil into the lubrication chamber;
A lid (76, 77) that is detachably provided in the oil supply hole and prevents the lubricant oil from flowing out from the oil supply hole to the outside of the sewing machine frame when mounted;
It is characterized by providing.

The invention according to claim 2 is the sewing machine according to claim 1,
The communication hole is
A first flow path (81, 84, 87) extending from the end on the lubrication chamber side to a predetermined position;
A second channel (82, 85, 88) that is continuous with the first channel and has a larger cross section than the first channel;
It is characterized by having.

The invention according to claim 3 is the sewing machine according to claim 2,
The first flow path is formed at a position that is eccentric downward with respect to the second flow path.

The invention according to claim 4 is the sewing machine according to any one of claims 1 to 3,
The oil supply hole and the communication hole are formed so as to be inclined downward toward the lubrication chamber side.

The invention according to claim 5 is the sewing machine according to any one of claims 1 to 4,
The communication hole is provided with a filter (95) for blocking mist-like lubricating oil from moving to the air vent hole.

According to the first aspect of the present invention, the air vent hole is formed so as to penetrate from the outer peripheral side of the stopper main body toward the communication hole, and the communication hole communicates with the outside of the sewing machine frame. Can be discharged to the outside of the sewing machine frame. Here, since the air vent hole is opened upward, leakage of the lubricating oil from the air vent hole can be prevented.
Further, since the oil supply hole is formed in the stopper main body so as to be continuous with the communication hole and is communicated with the outside of the sewing machine frame, the lubricating oil can be supplied into the lubrication chamber from the oil supply hole. Here, since the lid is detachably attached to the oil supply hole, when the oil is not supplied, the lubricating oil can be prevented from leaking from the oil supply hole by attaching the cover to the oil supply hole.
Accordingly, the plug member has a function as an air vent for lowering the increased internal pressure in the lubrication chamber and a function for supplying lubricating oil.
Therefore, unlike the prior art, there is no need to separately provide a hole for venting air and a hole for oiling in the wall portion of the lubrication chamber, and the number of machining points can be reduced. Moreover, since the hole formed in the wall part in a lubrication chamber can be reduced, the number of parts which block | close the hole can also be reduced.
Therefore, leakage of the lubricating oil from the air vent hole can be prevented while reducing the cost by reducing the number of parts to be processed and the number of parts.

According to the second aspect of the present invention, the communication hole has two flow paths (a first flow path and a second flow path) having different cross-sectional sizes, and the first flow path with a small cross section is on the lubrication chamber side. Therefore, the effect of preventing the lubricant from entering the communication hole can be improved.
In addition, since the effect of preventing the lubricant from reaching the air vent hole can be enhanced simply by providing a difference in cross-sectional size in the flow path, that is, by providing a step, a separate member is provided as in the prior art. There is no need to narrow the lubricating oil flow path.
Thus, cost reduction can be achieved.

According to invention of Claim 3, the distance of the connection part of a 1st flow path and a 2nd flow path and an air vent hole can be lengthened by decentering a 1st flow path below.
Thereby, compared with the case where the first flow path is formed without being eccentric, the lubricating oil is less likely to reach the air vent hole, so that the effect of preventing the lubricant oil from reaching the air vent hole can be enhanced.

  According to the fourth aspect of the present invention, since the oil supply hole and the communication hole are formed so as to incline downward toward the lubrication chamber side, the lubricating oil does not easily reach the air vent hole. Thereby, the effect of preventing the lubricating oil from reaching the air vent hole can be enhanced. In addition, when oil is supplied from the oil supply hole, the oil supply hole opens obliquely upward, so that it is easy to supply oil without tilting the sewing machine.

According to the fifth aspect of the present invention, the mist of lubricating oil can be absorbed by the filter.
As a result, even if the lubrication chamber is filled with air and mist-like lubricating oil, only the mist-like lubricating oil is caught by the filter, and the air passes through the filter and is discharged outside the sewing machine frame. It is possible to prevent leakage of lubricating oil.

Hereinafter, the best mode of a sewing machine according to the present invention will be described in detail with reference to the drawings.
<Configuration of sewing machine>
As shown in FIGS. 1 and 2, the sewing machine 100 includes a sewing machine frame 1 in which mechanisms of respective parts necessary for driving the sewing machine are accommodated. The sewing machine frame 1 includes a bed portion 2 provided at a lower portion of the sewing machine frame 1 and an arm portion 3 provided on an upper surface of the bed portion 2.

The bed portion 2 is provided with a lubrication chamber 4 whose internal space is sealed. The lubrication chamber 4 has a space formed therein, and the internal space is hermetically sealed by a bottom portion, a wall portion, and a ceiling portion around the lubrication chamber 4. The sealing of the lubrication chamber 4 is realized by an oil seal or packing.
Lubricating oil 5 is stored at the bottom of the lubricating chamber 4.
Inside the lubrication chamber 4 is housed a part of the drive mechanism 10 that needs to be lubricated to prevent seizure and heat generation.

  The drive mechanism 10 has, for example, a vertical feed shaft 11 for imparting vertical motion to the feed dog that feeds the cloth, a horizontal feed shaft 12 for imparting horizontal motion to the feed dog, and a shuttle fixed. A hook shaft 13 that rotates the hook in synchronism with the vertical movement of the needle bar 6, a feed adjustment mechanism shaft 14, and the like are provided. The vertical feed shaft 11 is provided with a gear 15, and the shuttle shaft 13 is provided with a gear 16. The gears 15 and 16 are arranged so as to mesh with each other. The drive mechanism 10 is connected to a sewing machine motor as a drive source (not shown) and is driven by the sewing machine motor.

  The gear 15 is arranged so that the lower part is immersed in the lubricating oil 5. Accordingly, when the vertical feed shaft 11 rotates and the gear 15 rotates, the lubricating oil 5 is wound up by the rotation of the gear 15, and the rolled up lubricating oil 5 is not only the gear 16 meshed with the gear 15 but also the lubricating chamber 4. This also applies to the horizontal feed shaft 12 and the shaft 14 provided therein. As a result, the lubricating oil 5 is supplied to the drive mechanism 10 in the lubricating chamber 4.

  Each shaft is rotatably supported by bearings or the like provided on the left and right wall portions 4a, 4a of the sewing machine in the lubrication chamber 4. For example, as shown in FIG. 1, the vertical feed shaft 11 is rotatably supported by a bearing 18. The periphery of the bearing 18 is also completely cut off from the outside of the lubrication chamber 4 by an oil seal, packing, etc., and the inside of the lubrication chamber 4 is kept sealed.

A through hole 4h is formed in the wall portion 4b facing the operator in the lubrication chamber 4 so as to penetrate from the outside to the inside of the lubrication chamber 4 in a substantially horizontal direction.
A plug member 7 for closing the through hole 4h is inserted into the through hole 4h and fixed to the wall portion 4b of the lubrication chamber 4.

  As shown in FIG. 3, the plug member 7 includes a plug main body 71 that is inserted into and fixed to the through hole 4h of the wall 4b. The plug body 71 is made of metal, for example. The plug body 71 is formed in a substantially columnar shape with a step, and a portion inserted into the wall portion 4 b is reduced in diameter than a portion exposed to the outside of the lubrication chamber 4. A groove is formed on the outer periphery of the reduced diameter portion, and a rubber O-ring 72 is fitted in the groove. The O-ring 72 is deformed when inserted into the through hole 4h, and functions as a stopper that prevents the plug body 71 from being displaced in the axial direction and coming off the through hole 4h due to the repulsive force.

The plug body 71 has a communication hole 73 that communicates with the inside of the lubrication chamber 4 when attached to the through hole 4h. The communication hole 73 is formed so as to extend along the axial direction of the plug body 71.
An air vent hole 74 is formed in the plug body 71 so as to penetrate from the outer peripheral side of the plug body 71 toward the communication hole 73. The air vent hole 74 communicates the communication hole 73 with the outside of the sewing machine frame (outside the lubrication chamber 4). Further, the opening on the outside of the sewing machine frame of the air vent hole 74 is assembled so as to be arranged upward in the vertical direction. That is, the stopper main body 71 and the wall 4b are engraved and set so that the positions of the inscription match, and then the stopper main body 71 is press-fitted into the sewing machine frame. The air vent hole 74 has a function as an exhaust port for exhausting the expanded air in order to maintain a balance between the internal pressure and the external pressure when the internal pressure in the lubrication chamber 4 increases. The air vent hole 74 is arranged so that the end (opening) on the outer side of the sewing machine frame opens upward in the vertical direction. Accordingly, the air vent hole 74 and the communication hole 73 are formed so that their axes are substantially orthogonal to each other. The reason why the air vent hole 74 is opened upward is to make it difficult for the lubricating oil 5 to leak from the air vent hole 74.

  The plug body 71 is formed with an oil supply hole 75 that is continuous with the communication hole 73 and communicates the communication hole 73 with the outside of the sewing machine frame (outside of the lubrication chamber 4) and guides the lubricating oil 5 into the lubrication chamber 4. The oil supply hole 75 is formed so as to continue to the communication hole 73 so as to extend in the same direction as the communication hole 73. That is, a straight oil supply path from the outside to the inside of the lubrication chamber 4 is formed by the oil supply hole 75 and the communication hole 73. The oil supply hole 75 is formed to have a larger cross section than the air vent hole 74.

  The oil supply hole 75 is provided with a lid 76 that is detachably provided in the oil supply hole 75. The lid body 76 is made of, for example, elastically deformed rubber or the like. The lid 76 completely shuts off the oil supply hole 75 and the outside of the sewing machine frame when attached to the oil supply hole 75, and prevents the lubricating oil 5 from flowing out of the oil supply hole 75 through the communication hole 73. If the lid 76 is removed from the oil supply hole 75, the oil supply path from the outside to the inside of the lubrication chamber 4 is opened, so that oil supply from the oil supply hole 75 is possible. The lid body 76 is formed to a predetermined length so as not to block the air vent hole 74 when the lid body 76 is attached to the oil supply hole 75. As a result, in a state in which the lid body 76 is attached to the oil supply hole 75 (a state other than oil supply including during work), the lubrication chamber 4 and the air vent hole 74 are in communication with each other, and the air in the lubrication chamber 4 is vented. It can be discharged from the hole 74.

<Effect>
As described above, according to the sewing machine 100 including the plug member 7 as described above, the air vent hole 74 is continuous with the communication hole 73 and communicates with the outside of the sewing machine frame 1. It can be discharged outside the frame 1. Here, since the air vent hole 74 has an end on the outer side of the sewing machine frame 1 opened upward in the vertical direction, leakage of the lubricating oil 5 from the air vent hole 74 can be prevented.
Further, since the oil supply hole 75 is continuous with the communication hole 73 and communicates with the outside of the sewing machine frame 1, the lubricating oil 5 can be supplied into the lubrication chamber 4 from the oil supply hole 75. Here, since the lid 76 is detachably attached to the oil supply hole 75, when the oil is not supplied, the cover 76 is attached to the oil supply hole 75 to prevent the lubricating oil 5 from leaking from the oil supply hole 75. can do.
Accordingly, the plug member 7 has a function as an air vent for lowering the increased internal pressure in the lubrication chamber 4 and a function for supplying the lubricating oil 5.
Therefore, unlike the prior art, it is not necessary to separately provide a hole for venting air and a hole for oiling in the wall portion 4b of the lubrication chamber 4, and the number of machining points can be reduced. Moreover, since the hole formed in the wall part 4b in the lubrication chamber 4 can be reduced, the number of parts which block | close the hole can also be reduced.
Therefore, the leakage of the lubricating oil 5 from the air vent hole 74 can be prevented while reducing the cost by reducing the number of parts to be processed and the number of parts.

<Modification 1>
In addition, this invention is not limited to the said embodiment, For example, it is good also as a plug member 7a as shown in FIG. The plug member 7a is different in the configuration of the lid and the oil supply hole, and the other parts have the same configuration as the plug member 7 of the above embodiment. Therefore, hereinafter, the lid and the oil supply hole having different configurations will be described.
A thread groove is formed in the oil supply hole 75a. The oil supply hole 75a is provided with a screw 77 as a lid so as to be screwed into the screw groove.
It is necessary to prevent the lubricating oil 5 from leaking from the gap between the screw 77 and the screw groove by taking measures such as applying a seal tape to the screw groove and screw 77 of the oil supply hole 75a.
The screw 77 is formed so as not to block the air vent hole 74 when it is attached to the oil supply hole 75a. Thus, in a state where the screw 77 is attached to the oil supply hole 75a (a state other than the oil supply including during work), the lubrication chamber 4 and the air vent hole 74 are in communication with each other, and the air in the lubrication chamber 4 is removed from the air vent hole. 74 can be discharged.

  By adopting such a configuration for the plug member 7 a, the screw 77 as the lid can be reliably fixed to the oil supply hole 75 a as compared with a configuration in which the rubber cover 76 is simply fitted into the oil supply hole 75. Accordingly, it is possible to prevent a situation in which the lubricating oil 5 leaks due to touching something.

<Modification 2>
Moreover, it is good also as a plug member 7b as shown in FIG. This plug member 7b is different in the configuration of the communication hole formed in the plug body, and the other parts have the same configuration as the plug member 7 of the above embodiment. Therefore, hereinafter, communication holes having different configurations will be described.
The communication hole 80 includes a first flow path 81 extending from an end on the lubrication chamber 4 side to a predetermined position (arbitrary), a second flow path that is continuous with the first flow path 81 and has a larger cross section than the first flow path 81. 82.
Both the first flow path 81 and the second flow path 82 are formed coaxially. Further, the first flow path 81 and the second flow path 82 are also coaxially formed with the oil supply hole 75. Accordingly, the first flow path 81, the second flow path 82, and the oil supply hole 75 are formed so as to be aligned substantially in the horizontal direction.
The oil supply hole 75 and the second flow path 82 have the same cross section, and the second flow path 82 communicates with the oil supply hole 75 and the air vent hole 74.
The first channel 81 has a reduced diameter at the boundary with the second channel 82. Therefore, the communication hole 80 is formed with a step at the boundary between the first flow path 81 and the second flow path 82.

With the plug member 7b having such a configuration, the first flow path 81 communicating with the lubrication chamber 4 is formed to have a smaller cross section than the second flow path 82 and the oil supply hole 75. The lubricating oil 5 is less likely to enter the first flow path 81 due to the small opening area.
Thereby, the effect of preventing the lubricating oil 5 from entering the communication hole 80 can be improved, and the effect of preventing the lubricating oil 5 from flowing out of the air vent hole 74 can be improved.
Further, since the effect of preventing the lubricating oil 5 from reaching the air vent hole 74 can be enhanced only by providing a difference in cross-sectional size in the flow path of the communication hole 80, that is, by providing a step, the communication hole as in the prior art. There is no need to provide a separate member for 73 to narrow the flow path of the communication hole 73. Thus, cost reduction can be achieved.

<Modification 3>
Moreover, it is good also as a plug member 7c as shown in FIG. The plug member 7c is different in the configuration of the communication hole formed in the plug body, and the other parts have the same configuration as the plug member 7 of the above embodiment. Therefore, hereinafter, communication holes having different configurations will be described.
The communication hole 83 extends from the end on the lubrication chamber 4 side to a predetermined position (arbitrary), a second flow path that is continuous with the first flow path 84 and has a larger cross section than the first flow path 84. 85.
The oil supply hole 75 and the second flow path 85 have the same cross section, and the second flow path 85 communicates with the oil supply hole 75 and the air vent hole 74.
The first channel 84 has a reduced diameter at the boundary with the second channel 85. Accordingly, the communication hole 83 is formed with a step at the boundary between the first flow path 84 and the second flow path 85. This is the same as the second modification.
In this example, the first flow path 84 is formed at a position that is eccentric downward with respect to the second flow path 85. That is, the oil supply hole 75 and the second flow path 85 are coaxially formed, but the first flow path 84 is eccentric from the second flow path 85 downward (opposite to the opening of the air vent hole 74). Is formed.

By configuring the plug member 7c as described above, the distance between the boundary between the first flow path 84 and the second flow path 85 and the air vent hole 74 is increased by decentering the first flow path 84 downward. be able to.
This makes it difficult for the lubricating oil 5 to reach the air vent hole 74 as compared with the case where the first flow path 84 is formed without being eccentric, so that the effect of preventing the lubricating oil 5 from reaching the air vent hole 74 is enhanced. Can do.

<Modification 4>
Moreover, it is good also as a plug member 7d as shown in FIG. The plug member 7d is different in the configuration of the communication hole and the oil supply hole formed in the plug main body, and the other parts have the same configuration as the plug member 7 of the above embodiment. Therefore, hereinafter, communication holes and oil supply holes having different configurations will be described.
The communication hole 86 includes a first flow path 87 extending from the end on the lubrication chamber 4 side to a predetermined position (arbitrary), a second flow path that is continuous with the first flow path 87 and has a larger cross section than the first flow path 87. 88.
The oil supply hole 90 and the second flow path 88 have the same cross section, and the second flow path 88 communicates with the oil supply hole 90 and the air vent hole 91.
The first channel 87 has a reduced diameter at the boundary with the second channel 88. Accordingly, the communication hole 86 forms a step at the boundary between the first flow path 87 and the second flow path 88. Further, both the first flow path 87 and the second flow path 88 are formed coaxially. Further, the first flow path 87 and the second flow path 88 are also formed coaxially with the oil supply hole 90. This is the same as the second modification.
In this example, it is formed so as to incline downward from the oil supply hole 90 toward the second flow path 88, from the second flow path 88 to the first flow path 87, and from the first flow path 87 to the lubrication chamber 4. ing. That is, the communication hole 86 and the oil supply hole 90 are formed so that the axis passing through the oil supply hole 90, the second flow path 88, and the first flow path 87 is inclined with respect to the horizontal direction.
Therefore, the lubricating oil 5 supplied from the oil supply hole 90 can easily flow into the lubrication chamber 4 along the inclination, but cannot flow backward from the lubrication chamber 4 to the air vent hole 91 and the oil supply hole 90.
However, the air vent hole 91 is formed so that the end portion on the outer side of the sewing machine frame opens upward in the vertical direction, as in the above-described embodiment and modification.

By configuring the plug member 7d as described above, the lubricating oil 5 is difficult to reach the air vent hole 91. On the other hand, the air in the lubrication chamber 4 is discharged to the outside through the communication hole 86 regardless of the inclination of the communication hole 86.
Thereby, the effect of preventing the lubricating oil 5 from reaching the air vent hole 91 can be enhanced. Also, when refueling from the refueling hole 90, the refueling hole 90 opens obliquely upward, and therefore it is easy to refuel without tilting the sewing machine.

<Modification 5>
Moreover, it is good also as a plug member 7e as shown in FIG. The plug member 7e is provided with a filter 95 that adsorbs the lubricating oil 5 to the second flow path 85 of the communication hole 83 in the plug member 7c shown in the third modification. Since the other configuration is the same as that of the third modification, the filter 95 will be described.
The filter 95 is made of a sponge-like material having oil resistance. The filter 95 blocks the passage of the mist-like lubricating oil 5 and adsorbs the mist-like lubricating oil 5. That is, the filter 95 has a function of blocking the mist-like lubricating oil 5 from moving to the air vent hole 74. The filter 95 can adsorb the mist-like lubricating oil 5, but can pass the normal liquid lubricating oil 5. Therefore, the lubricating oil 5 can be filtered by capturing only the impurities in the lubricating oil 5 with the filter 95 when the lubricating oil 5 is supplied from the oil supply hole 75. Further, when the lubricating oil 5 in the lubricating chamber 4 is discharged, impurities contained in the lubricating oil 5 can be filtered.

  By configuring the plug member 7e as described above, even if the inside of the lubrication chamber 4 is filled with air and the mist-like lubricating oil 5, only the mist-like lubricating oil 5 is caught by the filter 95, and the air passes through the filter 95. And the oil is discharged to the outside of the sewing machine frame 1, so that the lubricating oil 5 can be prevented from leaking from the air vent hole 74.

<Others>
Note that the present invention is not limited to the above-described embodiment, and the design can be freely changed without changing the essential part of the invention.

The front view which looked at some sewing machines in cross section. Sectional drawing which shows the structure in a lubrication chamber. Sectional drawing which shows the structure of a stopper member. Sectional drawing which shows the structure of the plug member of the modification 1. FIG. Sectional drawing which shows the structure of the plug member of the modification 2. Sectional drawing which shows the structure of the plug member of the modification 3. Sectional drawing which shows the structure of the plug member of the modification 4. Sectional drawing which shows the structure of the plug member of the modification 5. FIG. The figure which shows the air vent mechanism and oil supply mechanism in a lubrication chamber in a prior art. Sectional drawing of the air vent member provided in the lubrication chamber in a prior art. The figure which shows the air vent mechanism and oil supply mechanism in a lubrication chamber in a prior art. Sectional drawing of the rubber stopper provided in the lubrication chamber in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine frame 4 Lubrication chamber 4b Wall part 4h Through-hole 7 Plug member 7a Plug member 7b Plug member 7c Plug member 7d Plug member 7e Plug member 10 Drive mechanism 71 Plug body 73 Communication hole 74 Air vent hole 75 Oil supply hole 76 Cover body 77 Screw (Lid)
80 communication hole 81 first flow path 82 second flow path 83 communication hole 84 first flow path 85 second flow path 86 communication hole 87 first flow path 88 second flow path 90 oil supply hole 91 air vent hole 95 filter 100 sewing machine

Claims (5)

A sewing machine frame,
A lubricating chamber provided at a lower portion of the sewing machine frame and storing lubricating oil;
In a sewing machine comprising: a drive mechanism that operates by driving of a drive source, and at least a part of which is immersed in lubricating oil in the lubricating chamber;
The wall portion facing the operator in the lubrication chamber is formed with a through hole penetrating from the outside of the sewing machine frame into the lubrication chamber, and the through hole is provided with a plug member for closing the through hole,
The plug member is
A stopper body;
A communication hole formed in the plug body and communicating with the lubrication chamber;
An air vent hole that is formed so as to penetrate from the outer peripheral side of the stopper body toward the communication hole, communicates the communication hole and the outside of the sewing machine frame, and opens upward.
An oil supply hole that is formed in the plug body so as to be continuous with the communication hole, communicates the communication hole with the outside of the sewing machine frame, and guides lubricating oil into the lubricating chamber;
A lid that is detachably provided in the oil supply hole, and prevents the lubricating oil from flowing out from the oil supply hole to the outside of the sewing machine frame when installed;
A sewing machine comprising: The communication hole is
A first flow path extending from the end on the lubrication chamber side to a predetermined position;
A second flow path that is continuous with the first flow path and has a larger cross section than the first flow path;
The sewing machine according to claim 1, comprising:   The sewing machine according to claim 2, wherein the first flow path is formed at a position eccentrically downward with respect to the second flow path.   The sewing machine according to any one of claims 1 to 3, wherein the oil supply hole and the communication hole are formed to be inclined downward toward the lubrication chamber side.   The sewing machine according to any one of claims 1 to 4, wherein the communication hole is provided with a filter that blocks movement of mist-like lubricating oil to the air vent hole.

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