JP2009273573A - Oil feeder for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil feeder for a sewing machine capable of stably supplying the required slight amount of lubricating oil to a second sealed chamber while it is simply configured and is capable of being loaded inside the sewing machine. <P>SOLUTION: A second pump 30 is provided together adjacently to a first pump 5 arranged in a first sealed chamber 4. A first worm wheel 25 and a second worm are provided together and fixed to a first pump shaft 26 for driving the first pump 30, and a second worm wheel 34 is fixed to one end of a second pump shaft 31 for driving the second pump 30. The first worm 7 and the first worm wheel, and the second worm 27 and the second worm wheel 34 are engaged respectively, and the second pump shaft 31 is turned in linkage with a main shaft 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to an oil supply device for a sewing machine, and more particularly to an oil supply device for a sewing machine for supplying lubricating oil to a member that partially protrudes and slides from a frame of the sewing machine.

In order to prevent oil leakage from a member that partially protrudes and slides from the sewing machine frame, such as the needle bar of the overlock sewing machine or the upper looper base, the first sealed chamber having an oil sump in the frame and the above 2. Description of the Related Art Conventionally, a structure in which a base portion of a member is divided into a second sealed chamber is known (see, for example, Document 1). Reference 1 applies the above-described conventional technique to a needle bar mechanism of an overlock sewing machine, and is formed integrally with a bed constituting a part of a frame and has a trochoid in a first sealed chamber having an oil sump. A pump is installed and driven by the main shaft to circulate lubricating oil inside the sewing machine.
On the other hand, the base of the needle bar is accommodated in the second sealed chamber, and an oil supply pipe introduced from the first sealed chamber is opened in the vicinity of the needle bar. The oil supply pipe receives the lubricating oil scattered in the first sealed chamber in a bowl shape, and naturally flows down into the second sealed chamber and guides it to the needle bar.

  In addition, as means for supplying an appropriate amount of lubricating oil to the needle bar refueling chamber, such as the needle bar refueling chamber, an oil supply device that operates in a manner independent of the main shaft of the sewing machine is connected to a tank (oil sump), and the oil Lubricating oil supplied from the supply device is introduced into the hollow cylinder, and a piston capable of reciprocating within the cylinder is operated by the driving means to generate mist-like lubricating oil from the outlet of the cylinder. The thing is known conventionally (for example, refer patent document 2).

Japanese Utility Model Publication No. 6-10955 (page 4-5) Japanese Patent Laid-Open No. 11-57269 (FIG. 1)

However, in the prior art disclosed in Document 1, the oil supply to the second sealed chamber is performed by receiving the lubricating oil scattered in the first sealed chamber in a bowl shape through the oil supply pipe. Is unstable due to individual differences in the sewing machine and the rotational speed (speed). Therefore, in order to prevent seizure and wear of the needle bar, the amount of oil supplied to the second sealed chamber has to be set larger than the required amount. As a result, oil leakage easily occurs, and the arm ( It was necessary to provide oil draining means outside the frame).
In order to solve the above-mentioned problem, for example, when connecting from the discharge port of the trochoid pump to the oil supply pipe with a tube or the like, the trochoid pump covers the entire inside of the sewing machine, so the amount of oil supply is very large. It is extremely difficult to guide a desired small amount of lubricating oil to the second sealed chamber.

  If the prior art disclosed in Document 2 is applied, the required amount of lubricating oil can be supplied to the second sealed chamber. However, the oil supply device disclosed in Document 2 is complicated and large-scale, and the cost is high. There is a problem that it cannot be accommodated inside the sewing machine.

  Accordingly, an object of the present invention is to provide an oil supply device for a sewing machine that can stably supply a small amount of lubricating oil required for the second sealed chamber while being capable of being mounted inside the sewing machine with a simple configuration. There is to do.

In order to solve the above-described problems, a sewing machine oil supply device according to the present invention includes a first sealed chamber formed in a sewing machine frame in communication with an oil sump, a main shaft rotatably supported by the frame, A first worm fixed to the main shaft, a first worm wheel fixed to the first pump shaft and engaged with the first worm, and a first casing on which the first pump shaft is rotatably supported are provided. In a lubricating device for a sewing machine that includes a first pump and supplies lubricating oil in an oil sump from the first pump to the first sealed chamber by rotating the first pump shaft in conjunction with rotation of the main shaft.
A second worm that rotates together with the first pump shaft is fixed to the first pump shaft, a second pump is disposed adjacent to the first pump, and the second pump forms a second pump body. A casing, a second pump shaft that is rotatably inserted into the second casing and operates the second pump, a second worm wheel that is fixed to the second pump shaft and engages with the second worm, and supplied from the second pump And oil guiding means for guiding the lubricating oil to be introduced into a second sealed chamber separated from the first sealed chamber.

  Note that a special surface treatment may be applied to the surface of the sliding member accommodated in the second sealed chamber.

  According to the present invention, the second pump that can stably supply a small amount of lubricating oil into the second sealed chamber can be configured very simply and compactly, and can be mounted inside the sewing machine.

  Further, by applying a special surface treatment to the surface of the sliding member accommodated in the second sealed chamber, it is possible to prevent the sliding member from being worn and seized.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a partially broken overlock sewing machine to which the present invention is applied. FIG. 2 is a partial cutaway view of a main part of the oiling device for the sewing machine shown in FIG. In FIG. 1, the cover 8 provided on the front surface of the second sealed chamber 20 is omitted, and the internal mechanism is displayed.

  A main shaft 2 is horizontally disposed in a first sealed chamber 4 formed in the frame 1 so as to communicate with the oil sump 3, and is rotatably supported by the frame 1. In front of the frame 1, a second sealed chamber 20 is separated from the first sealed chamber 4 and is continuously provided. The front surface of the second sealed chamber 20 is covered with a cover 8. The main shaft 2 is connected to the upper looper shaft 9 via a known upper looper driving mechanism (not shown). The upper looper shaft 9 is disposed horizontally and orthogonal to the main shaft 2, and is supported by the frame 1 so as to be swingable around the shaft. One end of the upper looper shaft 9 protrudes into the second sealed chamber. The lever 11 is disposed in the second sealed chamber 20, and a base end thereof is fixed to one end of the upper looper shaft 9 with a bolt 28, and a distal end thereof is connected to the bifurcated portion 14 a of the upper looper base 14 and the connecting pin 12. Are connected to each other so as to be rotatable. The connecting pin 12 is hollow with both ends open, and an oil core 56 is inserted into the hollow.

The upper looper base 17 is disposed on the front surface of the frame 1 and above the second sealed chamber, and is fixed to the frame 1 with screws 18 and 18. The upper looper base 17 is formed with a horizontal hole 17a penetrating in the front-rear direction and a vertical hole 17b penetrating vertically perpendicular to the horizontal hole 17a. A cylindrical upper looper base guide 16 swings around the axis in the horizontal hole 17a. It is inserted as possible. As shown in FIGS . 2 and 7, an upper looper base cover 19 is attached to the front surfaces of the upper looper base 17 and the upper looper base guide 16. As shown in FIG. 7, the upper looper base guide 16 has an upper looper base through hole 16a and an oil core insertion hole 16b, and an oil core 57 is inserted into the oil core insertion hole 16b. The shaft portion 14b of the upper looper base 14 passes through the vertical hole 17b of the upper looper base 17, the upper looper base through hole 16a of the upper looper base guide 16, and the oil core 57, and from the upper end of the upper looper base guide through hole 16a. It protrudes. An upper looper 15 is attached to the upper end of the upper looper base 14.

In order to improve the wear resistance and seizure resistance of the sliding upper looper base 14 and upper looper base guide 16, titanium nitride is provided on the outer peripheral surface of the shaft portion 14 b of the upper looper base 14 and the upper looper base guide 16. It is desirable that a ceramic coating such as DLC (diamond-like carbon) coating is formed. In this embodiment, a DLC film formed by laminating a Cr layer, a Cr-WC gradient alloy layer, and a W-containing DLC layer in this order on the outer peripheral surface of the shaft portion 14b of the upper looper table 14 and the upper looper table guide 16 is formed. is there.

With the configuration described above, when the upper looper shaft 9 swings around the axis in conjunction with the rotation of the main shaft 2, the lever 11 fixed to the upper looper shaft 9 moves up and down, and the upper looper base connected to the lever 11. While being tilted as the upper looper base guide 16 swings, the guide 14 is guided by the upper looper base through- hole 16a and moves up and down.

As shown in FIGS. 1 and 2, the first worm 7 is fixed to the main shaft 2 with screws 44. The first pump 5 is a known trochoid pump, and an attachment portion 6 a of the first casing 6 that forms the body is fixed to the frame 1. The first pump shaft 26 is supported by the first casing 6 so as to be rotatable around the shaft, and the upper portion protrudes from the first casing 6. The first worm wheel 25 is fixed to a contact surface 26 a formed on the upper portion of the first pump shaft 26 with a screw 41 and is engaged with the first worm 7. When the first worm 7, the first worm wheel 25, and the first pump shaft 26 rotate in conjunction with the rotation of the main shaft 2, the lubricating oil in the oil sump 3 is taken into the first pump 5 by a known pump action. , is discharged from the first discharge hole 29, Ru is supplied into the first closed chamber 4.

  Next, the 2nd pump mechanism P is demonstrated based on FIG. 1 thru | or FIG. The second worm 27 is attached to the first pump shaft 26 of the first pump 5, and is positioned above the first casing 6 and below the first worm wheel 25. The first pump shaft 26 is formed with an engagement pin through hole 26b that passes through the axis of the first pump shaft 26 and is open at both ends perpendicular to the axis, and the engagement pin through hole 26b has a cylindrical shape. An engaging pin 45 is inserted so that both ends protrude from the outer peripheral surface of the first pump shaft 26. On the other hand, the second worm 27 has a shaft through hole 27a having the same diameter as that of the first pump shaft 31 and an engagement pin key groove 27b which is provided in the shaft through hole 27a and engages with the engagement pin 45 vertically. The second worm 27 is inserted into the first pump shaft 26 in a state where the engagement pin key groove 27b and the engagement pin 45 are engaged with each other. That is, the second worm 27 is fixed to the first pump shaft 26 in the horizontal rotation direction.

The second casing 32 forming the body of the second pump 30 is fixed to the first casing 6 with screws 23 and 23 on the left side of the first pump shaft 26. The second casing 32 is smaller than the first casing 6 and can be disposed adjacent to the first pump 5. The through hole 49 is formed so as to penetrate the second casing 32 in the horizontal direction. Both ends of the second pump shaft 31 protrude from the opening of the through hole 49 so as to be rotatable about the shaft, and a screw 42 is inserted into one end of the second pump shaft 31 with the second worm wheel 34 engaged with the second worm 27. The collar 33 is fixed to the other end with a screw 43 to restrict the movement of the second pump shaft 31 in the axial direction. As shown in FIG. 6, an eccentric portion 55 is formed on a part of the outer peripheral surface of the second pump shaft 31. The eccentric portion 55 is formed with a groove portion 55a formed of a groove having a width d over a half circumference along the circumferential direction of the second pump shaft. As shown in FIG. 6 (b), the cross-sectional shape of the groove portion 55a in the circumferential direction is an ellipse having a start point 55as and an end point 55ae as the major axis (= the diameter of the second pump shaft 31). Groove 55a is being fitted into the second casing 32, the volume for accommodating the lubricating oil to be incorporated into the second casings grayed 32 forms an oil accommodating chamber 60 of V.

As shown in FIGS. 4 and 5, the second casing 32 is provided with an oil guide hole 46, a discharge hole 47, a pin through hole 48, and a second discharge hole 50. One end of the discharge hole 47 opens to the through hole 49 of the second casing 32, and the other end opens to the inclined surface 32 b of the second casing 32. One end of the oil guide hole 46 opens in the middle of the discharge hole 47, and the other end opens in the rear vertical surface 32 a of the second casing 32. Fitting 51 is screwed to the other end of Shirubeyuana 46. The tubular oil guide pipe 35 is configured such that a part of the lubricating oil discharged from the first discharge hole 29 of the first pump is guided, and one end thereof is connected to the joint 51. In other words, a part of the lubricating oil discharged from the first pump in conjunction with the rotation of the main shaft 2 passes through the through hole 51 a of the joint 51, the oil guide hole 46, and the discharge hole 47 communicating with the oil guide hole 46. 32 through holes 49 and the second pump shaft 31 inserted into the through holes 49. Although excess of lubricating oil introduced into the second casing 32 of the second pump 30 is discharged to the outside of the second casing 32 through the other end of the discharge hole 47, whereby the micro mixed in lubricating oil Dust etc. are also discharged.

The pin through-hole 48 is located in front of the discharge hole 47, and one end opens to the through-hole 49 of the second casing 32 and the other end opens to the upper surface 32 c of the second casing 32. The pin 37 is inserted into the pin through hole 48 so as to be movable up and down. The diameter of the pin 37 is equal to the width d of the groove portion 55a of the eccentric portion 55 formed in the second pump shaft 31, and the pin through hole 49 is formed so that the lower end of the pin 37 is engaged with the groove portion 55a without a gap. It is positioned. The leaf spring 36 is a means for elastically pressing the pin 37 downward, that is, toward the eccentric portion 55 side of the second pump shaft 31, and its base end is fixed to the second casing 32 by a joint 51 and has a distal end. Is in elastic contact with the upper end of the pin 37.

The second discharge hole 50 is located in front of the pin through hole 48, and is formed by connecting a horizontal hole 50a extending horizontally and a vertical hole 50b extending vertically. The lateral hole 50 a has one end opened to the through hole 49 of the second casing 32 and the other end opened to the front vertical surface 32 d of the second casing 32. One end of the vertical hole 50b opens in the middle of the horizontal hole 50a, the other end opens in the upper surface 32c of the second casing 32, and the transport pipe 38 is fitted in the vertical hole 50b. With a screw 54 which is screwed into the other end of the transverse bore 50a is plug the other end which opens in said discharge Deana 50a, it is fixed this in contact with the lower end of the transport tube 38. As shown in FIGS. 2 and 4, one end of the transport tube 39 is connected to the upper end of the transport pipe 38, and the other end is connected to the base end of the oil supply pipe 13. The oil supply pipe 13 is fixed to the frame 1 so that the tip is exposed in the second sealed chamber 20, and the lubricating oil discharged from the second discharge hole 50 by the operation of the second pump 30 is transferred to the transport tube 39. And is led into the second sealed chamber 20 through the opening 13a of the oil supply pipe 13.

  The discharge hole 47 through which the oil guide hole 46 communicates, the pin through hole 48, and the through hole 49 side opening of the lateral hole 50 a of the second discharge hole 50 face the eccentric portion 55 of the second pump shaft 31, and the through hole 49 and the upper half of the second pump shaft 31 to be inserted. This is because when the second pump shaft 31 of the second pump 30 is rotated, the discharge hole 47, the groove 55a of the eccentric part 55, and the horizontal hole 50a of the second discharge hole 50 do not communicate with each other without the pin 37 interposed. It is an arrangement to make it.

  The operation of the oiling device for a sewing machine configured as described above will be described below. When the main shaft 2 is rotated by a driving source of a sewing machine (not shown), the first pump shaft 26 is rotated in conjunction with the main shaft 2 via the first worm 7 and the first worm wheel 25, whereby the first pump 5 is Operate. By the operation of the first pump 5, the lubricating oil in the oil sump 3 is taken into the first pump 5, discharged from the first discharge hole 29, and lubricates each part of the first sealed chamber 4. Part of the lubricating oil supplied into the first sealed chamber 4 is guided into the discharge hole 47 through the oil guide pipe 35, the joint 51, and the oil guide hole 46.

Next, the operation of one cycle of the second pump 30 will be described with reference to FIGS. Incidentally, each part shown in FIG. 8 (b) through FIG. 8 (d) is because it is the same as FIG. 8 (a), partially omitted code. When the first pump shaft 26 rotates in conjunction with the rotation of the main shaft 2, the second pump shaft 31 moves in the direction R around the shaft via the second worm 27 and the second worm wheel 34 (see from the left side of the sewing machine). Rotate counterclockwise.

  As shown in FIG. 8A, when the second pump shaft 31 rotates and the start point 55as of the groove portion 55a of the eccentric portion 55 passes through the pin 37, the discharge hole is located behind the pin 37 of the oil storage chamber 60. The lubricating oil guided to 47 is filled into the oil storage chamber 60. When the second pump shaft 31 further rotates and the end point 55ae of the groove 55a passes the pin 37, the entire oil storage chamber 60 communicates with the discharge hole 47 as shown in FIG. An amount of lubricating oil equal to V is filled in the oil storage chamber 60. Then, as shown in FIG. 8C, the second pump shaft 31 rotates while holding the volume V of lubricating oil in the oil storage chamber 60 until the start point 55as of the groove 55a reaches the pin 37 again. . As shown in FIG. 8D, when the starting point 55as of the groove 55a reaches the pin 37 and the second pump shaft 31 is further rotated, the lubricating oil filled in the oil storage chamber 60 is fitted into the groove 55a without any gap. The lubricating oil that has been blocked by the inserted pin 37 and can no longer be held in the oil containing chamber 60 as the volume of the oil containing chamber 60 on the front side of the pin 37 gradually decreases as the second pump shaft 31 rotates, The two discharge holes 50 are discharged into the horizontal hole 50a. When the end point 55ae of the groove 55a reaches the pin 37 again, all of the volume V of lubricating oil retained in the oil storage chamber 60 is discharged into the lateral hole 50a of the second discharge hole 50.

  The lubricating oil discharged into the horizontal hole 50a of the second discharge hole 50 is transported into the oil supply pipe 13 through the transport pipe 38 fitted in the vertical hole 50b and the transport tube 39 connected to the transport pipe 38. Then, it exudes from the opening 13 a of the oil supply pipe 13 and is guided into the second sealed chamber 20. Lubricating oil that has oozed out of the opening 13 a contacts the rear end surface of the connecting pin 12, and a part of the lubricating oil is taken into the oil core 56 that is inserted into the connecting pin 12, and the forked portion 14 a of the connecting pin 12 and the upper looper base 14. Lubricate the sliding surface. Lubricating oil that is not taken into the oil core 56 scatters in a mist form in the second sealed chamber 20 as the upper looper base 14 moves up and down, and a part thereof is the shaft portion 14 b of the upper looper base 14 and the upper looper base guide 16. The sliding surfaces of the upper looper base guide 16 and the upper looper base 14 and the sliding surfaces of the upper looper base guide 16 and the upper looper base 17 are lubricated. The lubricating oil that has not been applied to the lubrication of the sliding surfaces described above is eventually returned to the oil sump 3 through the discharge port 21 along the inner wall of the second sealed chamber 20.

  According to the second pump mechanism P configured as described above, the number of strips of the first worm 7 and the second worm 27 is a1, a2, the number of teeth of the first worm wheel 25, the second worm wheel 34 is b1, Assuming b2, the reduction ratio of the second pump shaft 31 with respect to the main shaft 2 is a1 * a2 / b1 * b2. In the present embodiment, a1 <b1 and a2 <b2 are set, and the second pump shaft 31 is in relation to the main shaft 2 as compared with the pump shaft connected by a pair of worms and worm wheels from the main shaft. A very large reduction ratio can be obtained. That is, the second pump 30 can discharge a very small amount of lubricating oil while interlocking with the main shaft 2.

  Further, the second pump 30 has a very simple structure. For example, when the first pump is a trochoid pump, the pressure loss is extremely small compared to this, and a part of the oil storage chamber 60 that takes in lubricating oil is provided. It is easy to increase the processing accuracy of the groove 55a to be formed. That is, even if the second pump 30 is downsized, high discharge amount accuracy can be ensured. As described above, the second pump 30 can be compactly disposed in the first sealed chamber 4 adjacent to the first pump 5.

FIG. 10 is a conceptual diagram showing the relationship between the amount of lubricating oil supplied to the second sealed chamber 20 and the sliding state of the upper looper base 14. The horizontal axis represents the rotational speed of the main shaft 2 and the vertical axis represents the first speed. The amount of oil supply to the two sealed chambers 20 is taken. A dotted line La indicates a threshold value for oil leakage, and an area above the threshold value La is an area where oil leakage from the upper looper base 14 occurs. An alternate long and short dash line Lb indicates a threshold for wear and seizure, and a region below the threshold Lb is an area where the upper looper base 14 is worn and seized. Therefore, it is desirable that the amount of oil supply is set to an intermediate position between the threshold value La and the threshold value Lb as indicated by the solid line L. However, according to the verification by the applicant, the amount of oil supply as indicated by the solid line L is extremely small, In the present embodiment, that is, in the present embodiment, when only the first pump 5 is provided, it is very difficult to stably guide the oil supply amount indicated by the solid line L to the second sealed chamber 20. By providing the second pump 30 of this embodiment with the reduction ratio and the volume V of the oil storage chamber 60 appropriately set, the amount of oil supply along the solid line L in FIG. 10 can be supplied to the second sealed chamber. Further, when a film having excellent wear resistance and seizure resistance is provided on the outer peripheral surface of the upper looper base 14 as in this embodiment, the threshold value Lb is lowered to the threshold value Lb ′, and the wear resistance of the upper looper base 14 is increased. , Seizure resistance is improved.

  The applicant conducted an endurance test for the overlock sewing machine of the present example with the oil supply amount to the second sealed chamber 20 set to 1/10 of the conventional one, and the overlock sewing machine of the endurance test was 1000 hours. During the ultra-long period, the operation was completed without causing oil leakage from the upper looper base 14, wear and seizure of the upper looper base 14.

The 2nd pump of this invention is not limited to the structure of a present Example, For example, the well-known plunger pump etc. which operate | move by rotation of a 2nd pump axis | shaft may be sufficient. In this embodiment, the lubricating oil discharged from the second pump 30 is introduced into the second sealed chamber 20 by the oil supply pipe 13 connected to the transport tube 39 , but the through hole 63 is formed in the frame 1. (See FIG. 11) One end is opened to the first sealed chamber 4 and the other end is opened to face the back of the upper looper base guide 16, the oil core 57 (see FIG. 11) inserted through the oil core insertion hole 16a . The transport tube 39 may be connected to one end of the through hole 63. Furthermore, the pump mechanism P of the present embodiment can be applied to the needle bar chamber 61 in which the base of the needle bar 61 is accommodated.

In the present embodiment, the second pump 30 is provided with a single pump mechanism having one discharge port (second discharge hole 50), but a plurality of pump mechanisms can coexist. . As shown in FIG. 9, the second pump shaft 31 is provided with an eccentric portion 55 having a groove portion 55a and a second eccentric portion 65 having a groove portion 65a in a range where the second pump shaft side opening of the discharge hole 47 faces. When the second pin through hole 68 and the third discharge hole 70 are provided in communication with the second eccentric portion 65 as shown in FIG. 9B, the two pump mechanisms operate independently of each other in the second pump 30. It becomes possible. By using this way the second pump 30 in the alternative embodiment constructed, a plurality of sealed chambers, for example, a second sealed chamber 20, it is possible to refuel Hariboshitsu 61 alone, respectively.

It is a partially broken front view of the overlock sewing machine to which the present invention is applied. It is sectional drawing on the left side which shows the principal part of the sewing machine. It is (a) schematic plane sectional drawing which shows the principal part of the oil supply apparatus of the sewing machine of this invention, (b) schematic left side sectional drawing. It is right side sectional drawing which shows the structure principal part of a 2nd pump. It is (a) top view which shows the structure of the 2nd casing of a 2nd pump, (b) BB partial fracture | rupture right side view of Fig.5 (a). FIG. 7A is a left side view showing the structure of a second pump shaft of the second pump, and FIG. 6B is a cross-sectional view taken along the line CC in FIG. It is a disassembled perspective view of an upper looper mechanism. It is the principal part right view which showed the behavior in 1 cycle of a 2nd pump. (A) The left view of the 2nd pump shaft in another Example of this invention, (b) The top view of a 2nd casing. It is a conceptual diagram which shows the relationship between the oil supply amount of the lubricating oil supplied to a 2nd airtight chamber, and the sliding state of an upper looper stand. It is another Example of the path | route which guides lubricating oil to a 2nd sealed chamber.

DESCRIPTION OF SYMBOLS 1 Frame 2 Main shaft 3 Oil sump 4 1st sealed chamber 5 1st pump 6 1st casing 7 1st worm 13 Oil supply pipe 20 2nd sealed chamber 25 1st worm wheel 26 1st pump shaft 27 2nd worm 29 2nd 1 discharge hole 30 second pump 31 second pump shaft 32 second casing 34 second worm wheel 35 oil guide pipe 36 leaf spring 37 pin 38 transport pipe 39 transport tube 46 oil guide hole 47 discharge hole 48 pin through hole 49 through hole 50 Second discharge hole 50a Horizontal hole 50b Vertical hole 55 Eccentric part 55a Groove part 55as Start point 55ae End point 60 Oil storage chamber

Claims (2)

A first sealed chamber formed in the frame of the sewing machine in communication with the oil sump, a main shaft rotatably supported by the frame, a first worm fixed to the main shaft, and fixed to the first pump shaft A first worm wheel engaged with the first worm and a first pump provided with a first casing on which the first pump shaft is rotatably supported. The first worm wheel is interlocked with the rotation of the main shaft. In an oil supply device for a sewing machine that supplies lubricating oil in an oil sump from a first pump to a first sealed chamber by rotating a pump shaft,
A second worm that rotates together with the first pump shaft is fixed to the first pump shaft, a second pump is disposed adjacent to the first pump, and the second pump forms a second pump body. A casing, a second pump shaft rotatably inserted into the second casing to operate the second pump, a second worm fixed to the second pump shaft and engaged with the second worm, and supplied from the second pump An oil supply device for a sewing machine, comprising: an oil guiding means for guiding the lubricating oil to the second sealed chamber separated from the first sealed chamber.   2. The sewing machine oil supply device according to claim 1, wherein a special surface treatment is applied to a surface of the sliding member to be the second sealed chamber. 3.

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