JP2008228787A - Oil tank of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil tank of a sewing machine capable of improving filtration efficiency further. <P>SOLUTION: A tank body 23 in the oil tank 10 is provided with a return port 21 for recovering oil 9 returned from a shuttle drive part and a discharge port 19 for discharging the oil stored inside the tank body 23 toward the shuttle drive part. Since an upstream side filter 35 for filtering the oil flowing into the tank body 23 from the return port 21 is disposed inside the tank body 23 and a downstream side filter 36 for filtering the oil which passes through the upstream side filter 35 is disposed at the discharge port 19, the filtration efficiency is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil tank for a sewing machine that stores oil to be supplied to a drive unit of the sewing machine.

  Conventionally, in an electric sewing machine, since a sewing machine motor is driven at a high speed, it is indispensable to supply lubricating oil to a driving unit that rotates and slides from the viewpoint of durability. In particular, it is important to supply oil to the rotary hook drive mechanism, the needle bar vertical movement mechanism, and the like. For example, the following oil supply is performed in the sewing machine described in Patent Document 1.

  That is, this sewing machine is provided with a sealed oil tank and a pump. The oil stored in the oil tank is supplied to the rotary hook part (drive part) by the pump, and the oil returned from the rotary hook part side is supplied to the oil tank. The oil is circulated such that it is recovered and stored, and the stored oil is supplied to the rotary hook again. A partition wall is provided inside the tank main body of the oil tank, and the inside of the tank main body for storing oil is divided into a return oil chamber for storing the oil to be recovered and an oil supply chamber for storing the oil for oil supply. . An upper portion of the partition wall is formed with a notch so that oil flows from the return oil chamber into the oil supply chamber, and a filter for filtration is provided on the upper surface of the return oil chamber.

In the above configuration, the oil recovered from the rotary hook side to the oil tank side is returned through the filter and stored in the oil chamber. At this time, dust, iron powder, and the like mixed in the recovered oil can be removed with a filter. The oil thus passed through the filter is stored in the return oil chamber, and fine impurities contained in the oil are deposited at the bottom of the return oil chamber. The oil stored in the return oil chamber overflows from the upper notch and is guided and stored in the oil supply chamber. Therefore, the oil stored in the oil supply chamber is one from which impurities are removed as much as possible, and the oil from which impurities have been removed can be supplied to the rotary hook portion.
JP 2006-87810 A

  In the structure of the above-mentioned patent document 1, since the filter for filtration is provided in the tank body in the oil tank, impurities mixed in the recovered oil can be effectively removed by the filter.

  However, once fine impurities pass through the filter, the impurities are supplied as they are to the rotary hook unless they settle on the bottom of the return oil chamber. A similar problem occurs when impurities are mixed into the oil at the downstream (downstream side) of the filter. That is, in the above oil tank, when new oil is replenished into the tank body, the oil injection port is provided on the side wall on the oil supply chamber side (that is, the downstream side). It is stored in the oil supply chamber without going through. Therefore, if the oil is contaminated during this replenishment or if external dust enters from the inlet, these impurities are supplied to the rotary hook portion together with the oil without being filtered by the filter. is there.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an oil tank for a sewing machine that can further improve the filtration efficiency.

  In order to achieve the above-described object, the oil tank of the sewing machine according to claim 1 of the present invention stores oil to be supplied to a drive unit of the sewing machine, and the tank main body storing the oil includes A return port for collecting the oil returning from the drive unit in the tank body, and a discharge port for discharging the oil stored in the tank body toward the drive unit are provided in the tank body. A first filter that filters oil flowing into the tank body from the return port is disposed, and a second filter that filters oil that has passed through the first filter is disposed at the discharge port. And

The oil tank of the sewing machine according to claim 2 is characterized in that, in the invention of claim 1, the second filter has a finer mesh than the first filter.
According to a third aspect of the present invention, there is provided an oil tank for a sewing machine according to the first or second aspect, wherein the second filter is attached to the discharge port, and the discharge port is detachably attached to the tank body. It is characterized by that.

  According to a fourth aspect of the present invention, there is provided an oil tank for a sewing machine according to the third aspect, wherein the second filter is detachably attached to the discharge port, and a part of the second filter is attached to the tank body in the attached state. It is characterized by protruding.

  The oil tank of the sewing machine according to claim 5 is the invention according to claim 4, wherein the second filter mounted on one side of the discharge port so as to protrude into the tank body is on the other side of the discharge port. A stopper portion of the second filter is provided so as not to move.

  According to the first aspect of the present invention, the oil that has flowed into the tank body from the return port is primarily filtered by the first filter, and is discharged from the discharge port toward the drive unit. Therefore, the filtration function can be enhanced as compared with an oil tank having a conventional configuration in which only one filter (first filter) is disposed in the tank body. Moreover, since the oil discharged toward the drive unit can be filtered by the second filter immediately before being discharged from the discharge port, the oil from which impurities are removed as much as possible can be supplied to the drive unit.

  According to the second aspect of the present invention, the first filter can have a relatively coarse structure, and small impurities contained in the oil that has passed through the first filter can be removed by the second filter. Can do.

According to the invention of claim 3, by removing the discharge port from the tank body, the second filter can be replaced or cleaned, and the maintainability can be improved.
According to invention of Claim 4, since the 2nd filter makes the shape which protrudes in a tank main body from a discharge outlet, the area thru | or volume of a 2nd filter can be enlarged more, and a filtration function can be improved. . In addition, when the second filter is attached to or detached from the discharge port, the second filter can be easily attached to or detached from the discharge port by picking the protruding portion, and thus the second filter can be easily replaced or cleaned. It can be carried out.

  According to invention of Claim 5, a 2nd filter can be hold | maintained so that it may not flow out from a discharge outlet in a stopper part. Therefore, it is possible to reliably prevent the second filter from flowing out and maintain a good oil circulation state.

Hereinafter, an embodiment in which the present invention is applied to an industrial electronic sewing machine will be described with reference to FIGS.
As shown in FIG. 1, the electronic sewing machine 1 includes a bed 2, a pedestal 3 that is erected on the right end of the bed 2, and a left so as to face the bed 2 from the upper end of the pedestal 3. And an arm portion 4 extending in the left direction (leftward in FIG. 1). The electronic sewing machine 1 is placed on a work table 5 (see FIG. 4).

  A needle bar 6 (see FIG. 1) having a sewing needle 6a is provided on the left side of the arm portion 4, and a main shaft (not shown) driven by a sewing machine motor is disposed inside the arm portion 4. Yes. The needle bar 6 is driven up and down when the rotational force of the main shaft is transmitted through a needle bar drive mechanism (not shown). In the arm part 4, in addition to the needle bar drive mechanism, a balance drive mechanism (not shown) for driving the balance is provided. The bed portion 2 is provided with a hook shaft (sometimes referred to as a lower shaft) 7 that rotates in synchronization with the main shaft, and a hook drive portion 8 (see FIG. 2) driven by the hook shaft 7. Yes. The bed portion 2 is provided with a hermetic oil tank 10 for storing lubricating oil 9 (see FIG. 4).

  The hook shaft 7 is provided with a plunger-type oil pump 11, and the oil 9 in the oil tank 10 is supplied to the hook drive unit 8 as a drive unit by the oil pump 11. . Specifically, the oil supply pump 11 is fixed to the bed portion 2 and includes a cylindrical pump metal (bearing metal) 12 that rotatably supports the shuttle shaft 7 as shown in FIGS. It is configured. An oil passage 12a is formed inside the pump metal 12, and an eccentric portion 7a is formed on the hook shaft 7 at a portion facing the oil passage 12a. Further, a hole 12b as shown in FIG. 3 is formed in the pump metal 12 at a portion corresponding to the eccentric portion 7a. The hole 12 b accommodates the plunger pin 13 and the compression coil spring 14 and is closed from the outer peripheral side of the pump metal 12 by a screw 15. The plunger pin 13 is urged by the compression coil spring 14 and comes into sliding contact with the outer periphery of the hook shaft 7 (eccentric portion 7a). An oil passage 7b extending in the axial direction as shown in FIG. 2 is formed in the shuttle shaft 7. The oil passage 7 b is for supplying the oil 9 in the oil passage 12 a to the shuttle drive unit 8.

  A suction port 16 and a discharge port 17 are provided at both ends of the oil passage 12a. The suction port 16 is connected to the discharge port 19 of the oil tank 10 via the supply tube 18, and the discharge port 17 is connected to the return port 21 of the oil tank 10 via the return tube 20. An adjustment valve 22 is provided in the middle of the return tube 20. The adjustment valve 22 is for adjusting the amount of oil supplied to the shuttle drive unit 8 through the oil passage 7b.

  Here, when the hook shaft 7 is rotated in a predetermined rotational direction during sewing of the electronic sewing machine 1, the pressure in the oil passage 12 a near the suction port 16 becomes negative, and the oil 9 in the oil tank 10 causes the supply tube 18 to flow. Through the oil supply pump 11. The oil 9 sucked into the oil supply pump 11 is transferred into a gap S (see FIG. 3) formed between the eccentric portion 7 a and the inner surface of the pump metal 12 as the hook shaft 7 rotates. Then, the tip of the plunger pin 13 is brought into sliding contact with the rotating eccentric portion 7a by the urging force of the compression coil spring 14, so that the oil 9 in the gap S is sent through the oil passage 12a toward the discharge port 17. Is done. At this time, a part of the oil 9 passing through the oil passage 12 a is supplied to the shuttle drive unit 8 through the oil passage 7 b according to the adjustment amount of the adjustment valve 22, and the rest is returned from the discharge port 17 to the return tube 20. And is returned to the oil tank 10. The supply tube 18, the oil pump 11 (the oil passage 12 a of the pump metal 12, the gap S), the oil passage 7 b of the hook shaft 7, the hook driving portion 8, the adjustment valve 22, and the return tube 20 are thus provided. Are referred to as an oil supply path in the present embodiment.

  Next, the oil tank 10 will be described with reference to FIGS. In the oil tank 10, a tank main body 23 that stores the oil 9 has a tank main body portion 24 that has a rectangular container shape whose upper surface is open, and the upper surface opening portion of the tank main body portion 24 is closed above the tank main body portion 24. The lid 25 is provided in a sealed manner. The tank main body 24 and the lid body 25 are made of a transparent synthetic resin so that the storage state of the oil 9 can be seen from the outside. A mounting portion 26 having a through hole 26a is integrally provided on the outer surfaces of the left and right side walls 24a and 24b of the tank main body 24 (left and right in FIG. 4). The tank main body 23 is detachably attached to the sewing machine frame 1A by attaching a screw (not shown) inserted through the through holes 26a of the attachment part 26 from below to the sewing machine frame 1A of the bed part 2.

  A stepped receiving portion 27 (see FIGS. 6 and 7) is formed on the inner peripheral edge of the upper portion of the tank main body 24. An inlet forming portion 28 is integrally provided at the left portion of the tank main body 24 so as to protrude forward, and an inlet 29 having an open front is formed below the inlet forming portion 28. Has been. The injection port 29 is closed by a removable cap 29a (shown only in FIG. 4). A rearwardly inclined portion 30 is integrally provided in the injection port forming portion 28, and the inclined portion 30 forms an injection path 30 a. The rear part of the injection port 29 communicates with the injection path 30a. An upper end portion 30 b (see FIGS. 5 and 6) of the inclined portion 30 is located slightly above the receiving portion 27, and an upper surface opening portion of the injection port forming portion 28 is also covered with the lid body 25.

  In the upper left part of the front wall 24c of the tank main body 24, the return port 21 is provided above the receiving portion 27. The return port 21 has a shape protruding outward (forward) as shown in FIG. 5, and the return tube 20 is connected to the tip portion thereof. In the front wall 24 c of the tank main body 24, the discharge port 19 is provided at the lower part of the central portion in the left-right direction, and the supply tube 18 is connected to the discharge port 19. Therefore, in the oil tank 10 of this embodiment, the upper part in the tank body 23 where the return port 21 is located is the upstream side, and the lower part in the tank body 23 where the discharge port 19 is located is the downstream side.

An oil gauge connection port 31 is provided in the lower part of the right side wall 24b of the tank main body 24, and this oil gauge connection port 31 is connected to an oil gauge 33 (see FIG. 1) via an oil tube 32. Yes.
As shown in FIG. 6, the lid body 25 is provided with a falling wall 34 that protrudes downward corresponding to the receiving portion 27. Between the lower end portion of the falling wall 34 and the receiving portion 27, a metal mesh upstream filter (corresponding to the first filter of the present invention) 35 is disposed.

  The upstream filter 35 has a rectangular flat plate shape, and the peripheral edge portion thereof is held by the falling wall 34 and the receiving portion 27, so that the upstream filter 35 is held immediately below the return port 21. That is, the upstream filter 35 is provided between the upper return port 21 and the lower discharge port 19 in the height direction in the tank main body 23 so as to cover the entire area in the tank main body 23. . The falling wall 34 of the lid 25 is formed with a notch 34a (see FIG. 6) in a portion corresponding to the injection path 30a, and injects new oil into the tank body 23 from the injection port 29. In this case, the oil can flow into the tank body 23 from the injection path 30a through the notch 34a. The oil in this case is injected as follows.

  First, the lid body 25 is mounted and the oil pipe is installed (the supply tube 18 is connected to the discharge port 19, the return tube 20 is connected to the return port 21, and the oil tube 32 is connected to the oil gauge connection port 31. The tank main body 23 is tilted rearward so that the inlet 29 faces upward. In this state, when oil is injected from the injection port 29, the injected oil flows into the tank body 23 from the notch 34a through the injection path 30a. The oil flowing in at this time is filtered by the upstream filter 35 and stored in the tank body 23. Further, since the tank main body 24 and the lid body 25 are formed of a transparent synthetic resin, an appropriate amount of oil can be injected while visually confirming the amount of oil stored in the tank body 23 from the outside.

  In addition, an opening 25a (see FIGS. 5 and 6) for cleaning the upstream filter 35 is formed near the front part of the left part of the lid 25, and a cap 25b can be attached to and detached from the opening 25a. Wearing. When cleaning the upstream filter 35, the following operation is performed with the electronic sewing machine 1 tilted backward. That is, a screw (not shown) to which the tank body 23 is attached is removed, and the tank body 23 is removed from the sewing machine frame 1A. At this time, the oil piping is left as it is. Then, the cap 25b of the lid 25 is removed, and tweezers (not shown), for example, are inserted from the opened opening 25a, and impurities attached to the upstream filter 35 are removed by the tweezers. Thereby, the upstream filter 35 can be cleaned. When the cleaning is finished, the cap 25b is attached to the opening 25a, and then the tank body 23 is attached to the sewing machine frame 1A again.

  A downstream filter (corresponding to a second filter of the present invention) 36 is disposed at the discharge port 19, and the discharge port 19 is detachably attached to the tank main body 24. Yes. The discharge port 19 and the downstream filter 36 will be described in detail with reference to FIGS.

  The discharge port 19 is attached to the front wall 24c of the tank main body 24 by screwing means as attachment means. A screw hole 37 is formed in the lower portion of the center portion of the front wall 24c, and an annular step portion 37a along the edge of the screw hole 37 is formed on the outer surface side of the front wall 24c. ing. The discharge port 19 is configured by integrally including a discharge port port body 38 having a substantially cylindrical shape as a whole and a flange 39 provided on the outer periphery of the intermediate portion in the axial direction thereof. A screw part 40 is formed on one side (right side in FIG. 8) with a flange 39 as a boundary, and a tube connection part 41 is formed on the other side of the outer peripheral part of the outlet port body 38. The discharge port 19 is detachably fixed to the tank main body 24 by screwing the screw portion 40 into the screw hole 37. In this case, the flange 39 is in close contact with the O-ring 42 disposed on the step 37a in a watertight and airtight manner. Moreover, as shown in FIG. 5, the outer peripheral part of the collar part 39 is formed in the hexagon shape with easy rotation operation with a tool, and can attach or detach the discharge port 19 easily.

  A large-diameter groove 43 is formed over the entire circumference on one side (right side in FIG. 8) of the inner peripheral portion of the outlet port body 38. The inner diameter dimension D1 of the large-diameter groove 43 is set to be larger than the inner diameter dimension D0 of the discharge port mouthpiece 38, and the stepped portion serving as the boundary between the inner diameter dimensions D0 and D1 is the same as that of the present invention. A stopper portion 43a is configured. A downstream filter 36 is attached to the large-diameter groove 43. The downstream filter 36 is made of a felt material having a finer mesh than the upstream filter 35 (that is, a relatively dense structure), and is formed in a cylindrical shape as a whole. The outer diameter of the downstream filter 36 is set to be approximately the same as the inner diameter dimension D1 of the large-diameter groove 43, and the downstream filter 36 is inserted into the large-diameter groove 43 so as to be detachably fitted to the discharge port 19. Is done. In this case, the downstream filter 36 is formed long in the axial direction so that a part thereof protrudes into the tank body 23. Further, the downstream filter 36 attached to one side of the discharge port 19 abuts against the stopper portion 43a at the end thereof and is locked so as not to move to the other side. In other words, the stopper portion 43a reliably holds the filter 36 so that the downstream filter 36 does not flow out of the discharge port 19 to the outside.

Next, the operation of the oil tank 10 having the above configuration will be described.
When the hook shaft 7 is rotationally driven during sewing, the oil pump 11 is activated, and the oil 9 stored in the tank body 23 in the oil tank 10 enters the oil pump 11 through the discharge port 19 and the supply tube 18. Sucked. Then, the oil 9 corresponding to the adjustment amount of the adjustment valve 22 is supplied to the hook drive unit 8 through the oil passage 7b in the hook shaft 7, and from the oil 9 and the hook drive unit 8 which are not supplied to the hook drive unit 8. The returned oil 9 passes through the return tube 20 and is collected from the return port 21 into the tank body 23.

  The oil 9 flowing into the tank body 23 from the return port 21 is primarily filtered by the upstream filter 35, and impurities such as dust and iron powder mixed in the oil 9 are removed. Thus, the oil 9 collected and stored in the tank body 23 is again discharged from the discharge port 19 toward the shuttle drive unit 8. In this case, the oil 9 immediately before being discharged from the discharge port 19 is secondarily filtered by the downstream filter 36. Since the downstream filter 36 has a relatively fine mesh, fine impurities such as having passed through the upstream filter 35 can be removed as much as possible. Therefore, clean oil 9 from which impurities are removed as much as possible is supplied from the discharge port 19 to the shuttle drive unit 8.

  As described above, according to the present embodiment, the oil 9 that has flowed into the tank body 23 from the return port 21 is primarily filtered by the upstream filter 35, and when discharged from the discharge port 19, the downstream filter 36. Therefore, the filtration function can be enhanced as compared with an oil tank having a conventional configuration in which only one filter is disposed in the tank body. Moreover, since the oil discharged toward the hook drive unit 8 can be filtered by the downstream filter 36 immediately before being discharged from the discharge port 19, impurities can be efficiently captured and the hook drive unit. The impurities of the oil supplied to 8 can be reduced as much as possible, and the durability of the shuttle drive unit 8 can be improved.

  Further, impurities that hinder the flow of the oil 9 in the oil supply path can be removed by the upstream filter 35 and the downstream filter 36 in the oil tank 10. Therefore, it is possible to stabilize the amount of oil supply and prevent seizure of the drive unit due to insufficient oil supply or oil stains on the sewing product due to excessive oil supply.

  Since the downstream filter 36 has a finer mesh than the upstream filter 35, using the upstream filter 35 with a relatively coarse mesh prevents clogging of the upstream filter 35 and reduces the service life. The oil can be extended for a long time, and small impurities contained in the oil that has passed through the upstream filter 35 can be removed by the downstream filter 36.

  Since the downstream filter 36 is attached to the discharge port 19 and the discharge port 19 is detachably attached to the tank body 23, the downstream filter 36 can be replaced by removing the discharge port 19 from the tank body 23. And can be cleaned. Further, the discharge port 19 was fixed to the tank body 23 with the O-ring 42 disposed by screwing means (that is, the screw hole 37 and the screw part 40) as attachment means. Therefore, the discharge port 19 can be fixed in a water-tight and air-tight manner with a simple configuration while no adhesive is required, and the maintainability can be improved.

  Since the downstream filter 36 has a shape protruding from the discharge port 19 into the tank body 23, the volume of the downstream filter 36 can be increased, and the filtration function can be enhanced. Further, when the downstream filter 36 is attached to or detached from the discharge port 19, the downstream filter 36 can be easily attached to or detached from the discharge port 19 by pinching the protruding portion, and as a result, the downstream filter 36 can be replaced or cleaned more easily. It can be done easily. If the downstream filter 36 flows out from the discharge port 19, dust may be clogged in the supply tube 18, and the good circulation state of the oil 9 may be hindered. In this embodiment, the outer diameter dimension of the downstream filter 36 is set to be larger than the inner diameter dimension D0 of the outlet port body 38, and the downstream filter 36 attached to one side of the outlet port 19 is connected to the outlet port 19. Since the stopper 43a of the downstream filter 36 is provided so as not to move to the other side, the downstream filter 36 can be securely held inside the discharge port 19 and the outflow of the downstream filter 36 described above can be prevented. it can. Therefore, the amount of oil supply becomes more stable, so that it is possible to reliably prevent the seizure of the drive unit due to insufficient oil supply.

  Unlike the conventional configuration in which the filter is provided in a narrow portion only on the upper surface of the return oil chamber partitioned by the partition wall, the filtration area of the upstream filter 35 is large and clogging is difficult. Further, the peripheral edge of the upstream filter 35 is received by the receiving portion 27 of the tank main body 24, and is held substantially over the entire circumference between the receiving portion 27 and the falling wall 34 of the lid body 25. Therefore, even if the amount of impurities on the upstream filter 35 increases and becomes heavy, it is possible to prevent the holding from being released and falling.

  As described above, when new oil is injected from the inlet 29 into the tank body 23, the oil flowing into the tank body 23 is filtered by the upstream filter 35 and stored in the tank body 23. Further, the stored oil is secondarily filtered by the downstream filter 36 when discharged. Therefore, even if the oil to be injected is dirty or external dust enters from the injection port 29, these impurities can be removed by the upstream filter 35 and the downstream filter 36, and the oil tank 10 is generally filtered. Function can be improved.

  By providing the opening 25a for cleaning the upstream filter 35 in the lid 25 in the tank body 23, the filter 51 can be easily cleaned through the opening 25a without removing the lid 25. And clogging of the upstream filter 35 can be prevented. Further, when the electronic sewing machine 1 or the tank main body 23 is tilted rearward, the opening 25 a is formed closer to the front portion of the lid body 25 so as to be positioned at the upper part of the tank main body 23. Thereby, when cleaning the upstream filter 35 or injecting new oil from the inlet 29, it is possible to prevent the oil 9 in the tank body 23 from leaking from the opening 25a.

The present invention is not limited to the embodiment described above and shown in the drawings, and can be modified or expanded as follows.
The present invention can be applied to all oil tanks that store oil to be supplied to a drive unit of a sewing machine. The shapes and materials of the upstream filter 35 and the downstream filter 36 are not limited to the above-described configurations, and can be appropriately changed such as using a sheet-like filter.

The screwing means may be constituted by a plurality of separate screws, and the discharge port 19 may be fixed by screwing these screws into the flange portion and the tank main body portion 24 formed to have a large diameter. Moreover, the attachment means of the discharge port 19 is not limited to the said screwing means, What is necessary is just to fix the discharge port 19 so that attachment or detachment is possible.
In addition, the present invention can be implemented with appropriate modifications without departing from the scope of the invention.

The perspective view of the electronic sewing machine which shows one Example of this invention Diagram for explaining oil circulation path by oil tank and oil pump Sectional drawing for demonstrating the structure of an oil supply pump Front view of an electronic sewing machine with a part cut away Oil tank perspective view Vertical rear view along line X1-X1 in FIG. Right side view of the oil tank with a part cut away Longitudinal right side view of the main part showing the enlarged vicinity of the downstream filter

Explanation of symbols

  In the drawings, 1 is an electronic sewing machine (sewing machine), 8 is a shuttle drive unit (drive unit), 9 is oil, 10 is an oil tank, 11 is an oil supply pump, 19 is a discharge port, 21 is a return port, 23 is a tank body, Reference numeral 29 denotes an inlet, 35 denotes an upstream filter (first filter), 36 denotes a downstream filter (second filter), and 43a denotes a stopper.

Claims (5)

In an oil tank that stores oil to be supplied to the drive unit of the sewing machine,
A return port for collecting the oil returning from the drive unit into the tank body, and a discharge port for discharging the oil stored in the tank body toward the drive unit in the tank body storing the oil And
A first filter that filters oil flowing into the tank body from the return port is disposed in the tank body,
A sewing machine oil tank, wherein a second filter for filtering oil that has passed through the first filter is disposed at the discharge port.   2. The sewing machine oil tank according to claim 1, wherein the second filter has a finer mesh than the first filter.   3. The sewing machine oil tank according to claim 1, wherein the second filter is attached to the discharge port, and the discharge port is detachably attached to the tank body.   4. The second filter is detachably attached to the discharge port, and a part of the second filter protrudes into the tank main body in the attached state. Sewing machine oil tank.   A stopper portion of the second filter is provided so that the second filter mounted on one side of the discharge port so as to protrude into the tank body does not move to the other side of the discharge port. 5. The oil tank for a sewing machine according to claim 4, wherein the oil tank is a sewing machine.

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