JP2010000217A - Oil feeder for horizontally rotating shuttle of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil feeder for a horizontally rotating shuttle of a sewing machine which preferably feeds oil to the horizontally rotating shuttle. <P>SOLUTION: The oil feeder 1 for the horizontally rotating shuttle of the sewing machine includes: an oil feeding pipe 11 through which a lubricant flows by the driving of a pump: oil discharge ports 53 and a groove 13; a hook shaft 21 which internally has a shaft hole 23 and a lateral hole 24 for connecting the sliding part of the horizontally rotating shuttle 40 to the groove 13 to guide the lubricant to the sliding part, and which has a diameter extension part 23b where the inner diameter of the horizontally rotating shuttle 40 side is made to be larger than that of a small diameter part 23a on the lower end side of the shaft hole 23; a spherical plug 31 arranged inside the diameter extension part 23b; and a spring 32 for pressurizing the plug 31 toward the lower end side of the hook shaft 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil supply device for a horizontal hook of a sewing machine.

Conventionally, a sewing machine has been provided with an oil supply device, and the oil supply device supplies lubricating oil to each part that slides with the operation of the sewing machine, thereby realizing smooth operation of each part and preventing seizure of the sliding part. I am trying.
Of these, the sewing machine equipped with a horizontal hook, which supplies lubricating oil to the sliding portion of the horizontal hook, is provided with an oil reservoir below the hook shaft of the horizontal hook, and the oil is supplied to the oil reservoir by a pump. The oil core in the hook shaft sucks the lubricating oil from the oil reservoir and guides it to the horizontal hook. In addition, in a conventional sewing machine horizontal hook oiling device, a felt, a filter or the like is provided in the oil reservoir, and the oil pressure supplied by the pump is reduced and adjusted to adjust the amount of oil supplied to the horizontal hook (for example, Patent Document 1).

FIG. 6 is a cross-sectional view showing a configuration of a conventional oiling device 100 for a horizontal hook of a sewing machine. The conventional horizontal hook oiling device 100 of the sewing machine includes a circulation path 110 for circulating lubricating oil, a hook shaft 121 provided below the outer hook 142 of the horizontal hook 140, and an oil provided below the hook shaft 121. A reservoir 150 and an oil core 123 erected along a shaft hole 122 formed in the shuttle shaft 121 are provided.
Lubricating oil sent out from the oil supply pipe 111 by driving a pump (not shown) flows through the circulation path 110. A felt 151 extends from the oil reservoir 150 in the circulation path 110. The felt 151 sucks the lubricating oil and guides it to the oil reservoir 150. An oil core 123 is erected in the oil reservoir 150. The oil core 123 is a core-shaped member formed by sintering and has countless fine filter-like gaps due to the sintering formation. The oil core sucks up the lubricating oil in the oil reservoir 150 by a capillary phenomenon due to the gap, guides the lubricating oil to the lubricating oil path 142a formed in the outer hook 142, and in the sliding portion between the outer hook and the inner hook of the horizontal hook. Supply lubricating oil. Note that the lubricating oil in the circulation path 110 is a so-called circulation type oil supply device that is recovered from the oil discharge pipe 112 and then sent out from the oil supply pipe 111 again.
JP-A-11-164978

By the way, dust and the like are often mixed in the lubricating oil, and the frequency is particularly high in a circulating oil supply device. For this reason, in a conventional oiling device for a horizontal hook of a sewing machine, there is a problem that dust or the like that may be mixed in the lubricating oil may be clogged in the felt 151 and the oil core 123, resulting in clogging and hindering the oiling. there were. In this case, the lack of lubricating oil in the sliding portion of the horizontal hook 140 causes malfunction of the hook and seizure.
Further, the lubricating oil leaks little by little from the gaps such as the joints of the parts constituting the oiling device 100 of the horizontal hook of the sewing machine due to its nature. When the pump is driven, the flow of the lubricating oil collected from the oil drain pipe 112 functions to suppress the leakage, but the pump does not operate when the sewing machine is not operating. Therefore, when the sewing machine is left in a non-operating state for a long time, the lubricating oil in the hook portion and the oil core 123 flows out from the horizontal hook to the oil sump 150 and is lubricated from the joints of the respective parts around the oil sump 150. In addition to the oil leaking and wasting the lubricating oil, there was a problem that the lower part of the oil reservoir 150 could be soiled.

  In view of the above-described problems, an object of the present invention is to provide an oil supply device for a horizontal hook of a sewing machine that supplies oil to a horizontal hook more suitably.

  The invention according to claim 1 is an oil supply device for a horizontal hook of a sewing machine that supplies lubricating oil to a sliding portion of a horizontal hook of a sewing machine, a circulation path of the lubricating oil, and a pump that supplies the lubricating oil to the circulation path; The sliding portion of the horizontal hook and the circulation path are connected to each other, and a branch path for guiding lubricating oil to the sliding section is provided on the inner side, and the inner diameter on the hook side compared to the circulation path side of the branch path A hook shaft provided with a diameter-enlarged portion having a larger diameter, and a plug having a portion provided in the diameter-expanded portion and having an outer diameter larger than the inner diameter of the branch path on the circulation path side and smaller than the inner diameter of the diameter-expanded section. And a pressing member that presses the stopper toward the circulation path.

  According to a second aspect of the present invention, in the oiling device for a horizontal hook of the sewing machine according to the first aspect, the diameter-expanding portion gradually increases in diameter toward the hook side, and the stopper is a rotating body. It is characterized by that.

  According to a third aspect of the present invention, in the oiling device for a horizontal hook of the sewing machine according to the second aspect, the stopper is spherical.

  According to a fourth aspect of the present invention, in the oiling device for a horizontal hook of the sewing machine according to the second aspect, the plug is a plug having a conical surface.

  According to a fifth aspect of the present invention, in the oiling device for a horizontal hook of the sewing machine according to the first aspect, the enlarged diameter portion has a shape in which the diameter portion on the circulation path side and the enlarged diameter portion on the hook side make a step. It is characterized by being.

According to the first aspect of the present invention, the oil supply device for the horizontal hook of the sewing machine has a branch path in the hook shaft that connects the circulation path of the lubricating oil and the sliding portion of the horizontal hook. That is, the lubricating oil passing through the circulation path is guided to the sliding portion of the horizontal hook through the branch path. On the other hand, the branch path is provided with an enlarged diameter portion whose inner diameter on the hook side is larger than that on the circulation path side. Further, a plug having a portion having an outer diameter larger than the inner diameter of the branch path on the circulation path side and smaller than the inner diameter of the diameter expansion section is provided in the expanded diameter section, and the stopper is pressed to the circulation path side by the pressing member. . That is, the stopper is pressed and locked at the boundary between the enlarged diameter portion and the branch path on the circulation path side. As a result, the circulation path is blocked by the stopper. At this time, if the lubricating oil travels around the circulation path by the pump, the hydraulic pressure when the lubricating oil flows also acts on the branch path side. The hydraulic pressure pushes up the plug, eliminates the blockage of the branch path, and feeds lubricating oil into the branch path on the enlarged diameter portion side. Therefore, when the pump is driven, the lubricating oil is supplied to the sliding portion of the horizontal hook. In addition, when the pump is not driven, the lubricating oil does not flow, so the hydraulic pressure does not work on the stopper. Therefore, the stopper closes the circulation path by the pressing force of the pressing member. As a result, the lubricating oil on the side of the horizontal hook from the stopper is blocked. Therefore, the lubricating oil in the hook portion and the oil core flows out from the horizontal hook to the oil sump, and the lubricating oil leaks out from the joints of the parts around the oil sump, and the lubricating oil is wasted. It is possible to eliminate the problems of the conventional sewing machine horizontal hook oiling device, such as soiling, and to provide a more reliable sewing machine horizontal hook oiling device.
Further, the oiling device for the horizontal hook of the sewing machine according to the present invention does not require a structure having a fine gap structure such as felt or an oil core having a filter-like gap. Therefore, the lubrication device of the conventional horizontal hook of the sewing machine in which the dust that may be mixed into the lubricating oil causes the felt and the oil core to be clogged and the oil supply is hindered, causing the horizontal hook to malfunction and seize. The above problem can be solved, and a more reliable oiling device for the horizontal hook of the sewing machine can be provided.

  According to invention of Claim 2, the diameter-expanded part is gradually diameter-expanded toward the hook side. That is, the part which is gradually expanded in diameter becomes a shape having a conical surface. The stopper is a rotating body. Therefore, even if the angle relationship between the plug and the wall surface in the branch path changes with the rotation of the shuttle shaft, the plug is always stably positioned inside the conical surface. Therefore, the position fluctuation of the stopper that can be caused by the rotation of the shuttle shaft or the vibration accompanying the operation of the sewing machine is reduced, and the opening and closing of the branch path by the stopper is more preferably performed. Therefore, more stable supply of lubricating oil is possible.

  According to the third aspect of the present invention, since the plug is spherical, a stable positional relationship is always maintained with respect to the conical surface in the branch path. Therefore, the position of the stopper is further reduced, and the opening and closing of the branch path by the stopper is more preferably performed. Therefore, it becomes possible to supply lubricating oil more stably.

  According to the fourth aspect of the present invention, since the plug has the conical surface, the orientation is suitably maintained by the conical surface in the branch path, thereby maintaining a stable position angle. Therefore, the position of the stopper is further reduced, and the opening and closing of the branch path by the stopper is more preferably performed. Therefore, it becomes possible to supply lubricating oil more stably.

According to the invention described in claim 5, the diameter portion on the circulation path side and the diameter-expanded portion on the shuttle side are stepped. That is, the stopper is pressed by the pressing member and locked to the stepped portion. Therefore, the stopper may be in any shape that can close the branch path when locked to the step, and the restriction on the shape of the stopper is reduced. Therefore, the degree of freedom in designing the oiling device for the horizontal hook of the sewing machine is improved.
In addition, compared with the case where the branch path is gradually expanded to the enlarged diameter portion, the process for forming the conical surface for gradually increasing the diameter can be omitted. A fueling device can be provided.

(Overall structure of the invention)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An oil supply device for a horizontal hook of a sewing machine according to the present invention is an oil supply device for a horizontal hook of a sewing machine that supplies oil to a sliding portion of the horizontal hook of a sewing machine.
FIG. 1 is a cross-sectional view showing a configuration of a lubricating device 1 for a horizontal hook of a sewing machine according to the present invention. The oiling device 1 for the horizontal hook of the sewing machine connects the oil supply pipe 11 and the oil discharge port 53 through which the lubricating oil circulates by driving a pump (not shown), the sliding portion of the horizontal hook 41 and the circulation path to connect the lubricating oil. A hook shaft 21 having a branch path 23 on the inner side thereof, a spherical plug 31 provided in a diameter enlarged portion 23b of a shaft hole 23 formed in the hook shaft 21, and a diameter enlarged portion 23b. And a spring 32 as a “pressing member” which is provided above the stopper 31 and presses the stopper 31 downward. The horizontal hook oil supply device 1 of the sewing machine supplies lubricating oil to the sliding portion between the inner hook 41 and the outer hook 42 of the horizontal hook 40.

  First, the horizontal hook 40 will be described in detail. The horizontal hook 40 includes an inner hook 41 that is provided below the needle plate 51 of the sewing machine and can store a bobbin therein, and an outer hook 42 that is rotatably provided along the outer periphery of the inner hook 41. is doing. The inner hook 41 is restricted from rotating by a protrusion provided on a sewing machine frame (not shown). Further, a step portion 41a provided on the outer periphery of the inner hook 41 and a groove 42a formed on the inner periphery of the outer hook 42 are provided to engage with each other, and the outer hook 42 is guided by the step portion 41a. It is provided to be rotatable along the outer periphery of the hook 41.

The hook shaft 21 is a shaft portion that is fixedly connected to the lower portion of the outer hook 42 and extends in the vertical direction. The shuttle shaft 21 is rotatably supported by a sewing machine frame 52. Further, the hook shaft 21 has a helical gear 22 fixedly supported at the lower portion thereof, and rotational movement is transmitted from a gear (not shown) provided to mesh with the gear 22 so that the hook shaft 21 and the outer hook 42 are provided. Rotates. The rotation is performed in synchronization with the vertical movement of the sewing needle supported by the needle bar (not shown) of the sewing machine provided above the needle plate 51, and the vertical movement of the sewing needle and the tip of the outer hook 42 (illustrated). The stitches are formed in a well-known manner in cooperation with the rotation of (substantially).
In this rotational movement, the outer periphery of the inner hook 41 and the inner periphery of the outer hook 42 slide. The oil supply device 1 for the horizontal hook of the sewing machine supplies lubricating oil to a sliding portion (hereinafter simply referred to as “sliding portion”) between the outer periphery of the inner hook 41 and the inner periphery of the outer hook 42.

(Oil feeder for horizontal hook of sewing machine)
Next, each part of the oiling device 1 of the horizontal hook of the sewing machine will be described in detail. The mechanism by which the hook shaft 21 rotates the outer hook 42 is as described above.
The oil supply pipe 11 is a tubular member through which lubricating oil flows by driving a pump (not shown), and the lubricating oil flows from the oil supply pipe 11 side to the oil discharge port 53 side. The oil drain port 53 is a hole that spatially continues the outside of the sewing machine frame 52 provided in the sewing machine frame 52 and a groove 13 described later.
The pump used in the oiling device 1 for the horizontal hook of the sewing machine of the present invention collects the lubricating oil discharged from the oil discharge port 53 with an oil pan, an oil tank or the like (not shown), and the collected lubricating oil is reused. This is a so-called circulation type that is fed from the oil supply pipe 11 side. The pump is driven only when the sewing machine is operating. The oil outlet 53 is provided with an oil amount adjusting screw 12a for adjusting the amount of lubricating oil discharged and the amount of lubricating oil supplied by a pump.

  As shown in FIG. 1, the lower end portion of the shuttle shaft 21 is located between the oil supply pipe 11 and the oil discharge port 53, but the sewing machine frame 52a that rotatably supports the lower end portion includes A groove 13 is provided along the outer periphery of the lower end, and the lubricating oil fed from the oil supply pipe 11 flows to the oil discharge port 53 via the groove 13. The lubricating oil discharged from the oil discharge port 53 is collected by an oil pan, an oil tank or the like, and sent out from the oil supply pipe 11 again by a pump. Therefore, the oil supply pipe 11, the oil discharge port 53, and the groove 13 function as a “circulation path”. The amount of lubricating oil discharged from the oil discharge port 53 is adjusted by the oil amount adjusting screw 12a.

A shaft hole 23 is provided in the shuttle shaft 21 along the axial direction thereof. The upper end of the shaft hole 23 is continuous with a lubricating oil path 42 b provided in the outer hook 42. The lubricating oil path 42b is provided to guide the lubricating oil passing through the inside to the sliding portion. That is, the lubricating oil that has reached the lubricating oil path 42b through the shaft hole 23 is supplied to the sliding portion. Details thereof will be described later.
Further, the shuttle shaft 23 is provided with a larger diameter of the portion (the enlarged diameter portion 23b) located on the upper side than the diameter of the lower end side (small diameter portion 23a). The connecting position 23c between the small diameter portion 23a and the large diameter portion 23b has a shape that gradually expands from the small diameter portion 23a toward the large diameter portion 23b. Note that the lower end of the shuttle shaft 23 does not penetrate and is closed.

Moreover, the spherical stopper 31 is provided in the enlarged diameter part 23b as mentioned above. The diameter of the plug 31 is smaller than the inner diameter of the enlarged diameter portion 23b and larger than the inner diameter of the small diameter portion 23a. Further, the spring 32 presses the stopper 31 toward the lower end side of the shuttle shaft 23, that is, “circulation path side”. Accordingly, the plug 31 is locked at the connecting position 23c, and the shaft hole 23 is closed at the connecting position 23c.
A screw 23d for connecting the outer hook 42 and the hook shaft 21 is provided above the enlarged diameter portion 23b, and the spring 32 has its upper end locked to the lower end of the screw 23d, thereby closing the plug 31. Press toward the lower end of the hook shaft 23. In addition, a hole for connecting the enlarged diameter portion 23b and the lubricating oil path 42b is provided in the screw 23d, and the shaft hole 23 is configured including the small diameter portion 23a and the enlarged diameter portion 23b.

  Further, a lateral hole 24 orthogonal to the small diameter portion 23a is provided below the coupling position 23c. The lateral hole 24 is provided so as to connect the outer periphery of the shuttle shaft 23 and the small diameter portion 23a. That is, the lateral hole 24 connects the shaft hole 23 and the groove 13.

(Supplying lubricating oil to sliding parts)
Next, a detailed description will be given of a mechanism for supplying lubricating oil to the sliding portion. FIG. 2 is an enlarged cross-sectional view of the configuration near the connection position 23c. 2A shows a state where the hydraulic pressure by the pump is working and the stopper 31 is raised, and FIG. 2B shows a state where the hydraulic pressure is not working. An arrow S indicates the direction in which the lubricating oil flows.
As described above, during the operation of the sewing machine, the lubricating oil sent out from the oil supply pipe 11 by the drive of the pump flows out to the oil discharge port 53 through the groove portion 13. At this time, the lubricating oil enters from the side holes 24 and almost or completely fills the small diameter portion 23a. In this state, as shown in FIG. 2A, the hydraulic pressure of the lubricating oil sent out from the oil supply pipe 11 works from the opening 24a side into the small diameter portion 23a. At this time, since the small diameter portion 23 a is closed by the plug 31, the hydraulic pressure is concentrated on the upper plug 31. The hydraulic pressure pushes up the plug 31 and the lubricating oil flows into the enlarged diameter portion 23b. At this time, if there is already lubricating oil accumulated in and above the enlarged diameter portion 23b, it is pushed up by the newly flowing lubricating oil and further moves upward. As a result, the lubricating oil is sent out above the shaft hole 23 and supplied to the sliding portion through the lubricating oil passage 42b. Therefore, the lateral hole 24 and the shaft hole 23 function as a “branch path”.

On the other hand, as shown in FIG. 2B, when the sewing machine is not operating, that is, when the pump is not driven, the lateral hole 24 is not subjected to the hydraulic pressure of the lubricating oil fed from the oil supply pipe 11. For this reason, the stopper 31 pressed to the lower end side of the hook shaft 23 by the spring 32 maintains the state where the connecting portion 23c is closed. For this reason, the lubricating oil does not flow above the enlarged diameter portion 23b, and the lubricating oil that has already accumulated in the enlarged diameter portion 23 and above it does not flow downward.
The pressing force of the plug 31 by the spring 32 is such that the plug 31 is pushed up by the oil pressure when the oil pressure of the lubricating oil accompanying the driving of the pump is applied as described above, and there is no such oil pressure. Is provided with a pressing force that sufficiently closes the connecting portion 23c.

(Operational effect of the oiling device for the horizontal hook of the sewing machine according to the present embodiment)
According to the above-described embodiment, when the pump is not driven, the plug 31 closes the circulation path by the pressing force of the spring 32. As a result, the lubricating oil on the horizontal hook 40 side from the stopper 31 is blocked. Therefore, the lubricating oil in the hook portion and the oil core flows out from the horizontal hook to the oil sump, and the lubricating oil leaks out from the joints of the parts around the oil sump, and the lubricating oil is wasted. It is possible to eliminate the problems of the conventional sewing machine horizontal hook oiling device, such as soiling, and to provide a more reliable sewing machine horizontal hook oiling device.
Further, the present embodiment does not have a configuration having a fine gap structure such as felt or an oil core having a filter-like gap. Therefore, the lubrication device of the conventional horizontal hook of the sewing machine in which the dust that may be mixed into the lubricating oil causes the felt and the oil core to be clogged and the oil supply is hindered, causing the horizontal hook to malfunction and seize. The above problem can be solved, and a more reliable oiling device for the horizontal hook of the sewing machine can be provided.

  Further, the connecting position 23c between the small diameter portion 23a and the large diameter portion 23b gradually increases in diameter toward the horizontal shuttle 40 side. That is, the connection position 23c has a shape having a conical surface. The stopper 31 is spherical and is a rotating body. Therefore, even if the angle relationship between the plug 31 and the wall surface in the shaft hole 23 changes with the rotation of the shuttle shaft 21, the plug 31 is always stably positioned inside the coupling position 23c. Therefore, the displacement of the position of the plug 31 that may be caused by the rotation of the shuttle shaft 23 or the vibration accompanying the operation of the sewing machine is reduced, and the opening and closing of the shaft hole 23 by the plug 31 is more suitably performed. Therefore, more stable supply of lubricating oil is possible.

(Other)
The embodiment of the present invention is not limited to the above. An example of another embodiment of the present invention will be shown below. In addition, the same code | symbol is attached | subjected about the structure similar to the above-mentioned embodiment, and it abbreviate | omits.
FIG. 3 is an explanatory diagram showing a configuration in which the coupling position 23c is closed by the taper pin 31A. As shown in FIG. 3, a taper pin 31 </ b> A having a conical surface whose diameter decreases downward may be provided at the connection position 23 c and the taper pin 31 </ b> A may be pressed downward by a spring 32. The conical surface of the taper pin 31A has a large diameter portion 31Aa larger than the small diameter portion 23a and smaller than the large diameter portion 23b. In addition, the conical surface of the taper pin 31A has a small system portion 31Ab smaller than the small diameter portion 23a. Moreover, this structure is the same as that of the above-mentioned embodiment except the point which replaces the plug 31 in the above-mentioned embodiment with the taper pin 31A.

  FIG. 4 is an explanatory diagram showing a configuration in which the connecting position 23c is closed by the stepped pin 31B. As shown in FIG. 4, a stepped pin 31 </ b> B having a conical surface whose diameter decreases downward and having a convex portion 31 </ b> Ba at the tip portion of the conical surface is provided at the connection position 23 c and stepped by a spring 32. The pin 31B may be pressed downward. The conical surface of the stepped pin 31B has a larger diameter portion 31Ba larger than the smaller diameter portion 23a and smaller than the larger diameter portion 23b. Moreover, the diameter of convex part 31Bb is smaller than the enlarged diameter part 23b. Moreover, this structure is the same as that of the above-mentioned embodiment except the point which replaces the stopper 31 in the above-mentioned embodiment with the stepped pin 31B.

  In the case of a configuration using a conical surface such as a taper pin 31A or a stepped pin 31B, in addition to the effects of the above-described embodiment, the taper pin 31A and the stepped pin 31B have a conical surface. A stable position angle is maintained by being preferably guided by the connecting position 23c having a shape along the conical surface. Therefore, the positional fluctuation of the taper pin 31A or the stepped pin 31B is further reduced, and the shaft hole 23 is more preferably opened and closed. Therefore, it becomes possible to supply lubricating oil more stably.

FIG. 5 is an explanatory diagram showing a configuration in which the small-diameter portion 23a and the enlarged-diameter portion 23b of the shaft hole 23 have a stepped shape. As shown in FIG. 5, the small diameter part 23a and the enlarged diameter part 23b of the shaft hole 23 may form the step without providing the structure corresponding to the connection position 23c shown in the above-mentioned embodiment. Further, a valve-like stopper 31C is provided so as to be locked to the step of the small diameter portion 23a and the large diameter portion 23b. The plug 31 </ b> C closes the shaft hole 23 by being pressed toward the circulation path by the spring 32. Further, the blocking of the shaft hole 23 is eliminated by hydraulic pressure as in the above-described embodiment.
In this case, the plug 31C only needs to have a shape capable of closing the shaft hole 23 by being locked to the step, and the restriction on the shape of the plug is reduced. Therefore, the degree of freedom in designing the oiling device for the horizontal hook of the sewing machine is improved. Further, as compared with the case where the diameter is gradually increased as in the connection position 23c in the above-described embodiment, the processing for forming the conical surface for gradually increasing the diameter can be omitted, so that the cost can be reduced. An oil supply device for a horizontal hook of a sewing machine can be provided.
In the configuration in which the small-diameter portion 23a and the enlarged-diameter portion 23b of the shaft hole 23 are stepped as shown in FIG. 5, any one of the above-described plug 31, taper pin 31a, or stepped pin 31B is used. Also good.

  Needless to say, the embodiments are not limited to the above as long as they do not depart from the features of the present invention.

It is sectional drawing which shows the structure of the oil supply apparatus 1 of the horizontal hook of the sewing machine by this invention. It is an expanded sectional view of the composition near a connecting position. 2A shows a state where the hydraulic pressure by the pump is working and the stopper is raised, and FIG. 2B shows a state where the hydraulic pressure is not working. It is sectional drawing which shows the structure which obstruct | occludes a connection position with a taper pin. It is sectional drawing which shows the structure which obstruct | occludes a connection position with a stepped pin. It is sectional drawing which shows the structure which is a shape where a connection position makes a step. It is sectional drawing which shows the structure of the oil supply apparatus of the conventional horizontal hook of a sewing machine.

Explanation of symbols

11 Refueling pipe

21 Hook Shaft 23 Shaft Hole 23b Expanded Diameter 24 Horizontal Hole 31 Plug 32 Spring 40 Horizontal Hook 53 Oil Drain Port

Claims (5)

In the lubrication device for the horizontal hook of the sewing machine that supplies lubricating oil to the sliding part of the horizontal hook of the sewing machine,
Lubricating oil circulation path,
A pump for supplying lubricating oil to the circulation path;
The sliding portion of the horizontal hook and the circulation path are connected to each other, and a branch path for guiding lubricating oil to the sliding section is provided on the inner side, and the inner diameter on the hook side compared to the circulation path side of the branch path A hook shaft provided with an enlarged diameter portion,
A plug having a portion provided in the enlarged diameter portion and having an outer diameter larger than an inner diameter of the branch path on the circulation path side and smaller than an inner diameter of the enlarged diameter section;
An oil supply device for a horizontal hook of a sewing machine, comprising: a pressing member that presses the stopper toward the circulation path. The diameter-expanded portion gradually increases in diameter toward the hook side,
2. The oiling device for a horizontal hook of a sewing machine according to claim 1, wherein the stopper is a rotating body.   3. The oiling device for a horizontal hook of a sewing machine according to claim 2, wherein the stopper is spherical.   The oiling device for a horizontal hook of a sewing machine according to claim 2, wherein the stopper is a stopper having a conical surface.   The oil supply device for a horizontal hook of a sewing machine according to claim 1, wherein the enlarged diameter portion has a shape in which the diameter portion on the circulation path side and the enlarged diameter portion on the hook side form a step.

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