JP5524677B2 - Sewing machine oiling equipment - Google Patents

Description

  The present invention relates to a sewing machine oil supply device, and more particularly to a sewing machine oil supply device for supplying lubricating oil to a sliding member in a sewing machine arm.

In many sliding members of the sewing machine, lubricating oil is supplied to a portion where the sliding is intense so that sliding is performed smoothly. For example, in order to supply an appropriate amount of lubricating oil according to conditions to the sliding member in the sewing machine arm, the amount of lubricating oil in the oil pan (oil sump) can be adjusted by a gear type oil pump provided in the sewing machine bed What is conventionally supplied to the sliding member of a sewing machine is known (for example, refer to literature 1).
Document 1 applies the above-described conventional technique to a needle bar crank rod of a sewing machine, and attaches an oil pump to a bracket fixed to the sewing machine bed, and the worm wheel of the oil pump is interlocked with the rotation of the lower shaft. Oil in the oil pan is sucked into the oil pump. The sucked-up lubricating oil is supplied into the sewing machine arm via a supply pipe and an oil supply pipe connected to the oil supply pump, and the lubricating oil is divided in the sewing machine arm by a joint to which the supply pipe, the oil supply pipe and the oil tray are connected, One is supplied to an oil pan placed above the sewing machine arm, and the other is fed from a supply pipe connected to the joint. For the lubricating oil delivered from the supply pipe, the oil supply amount can be adjusted by the oil amount adjusting member provided at the connection point between the supply pipe and the oil supply pipe so that the desired amount of lubricating oil can be supplied to the needle bar crank rod. is there. The lubricating oil supplied to the needle bar crank rod scatters around the needle bar crank rod as the sewing machine is driven, and is supplied to each sliding member, for example, the needle bar supported by the needle bar bush.

JP 2006-110377 A

When excessive lubricating oil is supplied to a member such as a needle bar that protrudes and slides partly from the frame of the sewing machine, so-called oil leakage occurs in which the lubricating oil leaks out of the frame through the member protruding from the frame. In particular, in recent years, there has been an increasing demand for solving this oil spill. In particular, lubrication of the needle bar crank rod causes excess lubricant to leak out of the frame through the needle bar, so there is a high possibility that the leaked lubricant will adhere to the sewing product. When supplying oil, a very small amount of oil supply according to conditions is required.
However, in the prior art disclosed in Document 1, it is difficult to stably send a small amount of lubricating oil required for the needle bar crank rod to the supply pipe with a structure in which the lubricant is diverted by the joint. Therefore, the amount of oil sent from the joint to the supply pipe must be set to be larger than the required amount, and an oil amount adjusting member is provided in the middle from the joint to the oiling point, depending on the usage conditions of the sewing machine. It was necessary to adjust the oil amount adjusting member.

  As a proposal to eliminate the adjustment work by the oil amount adjusting member and the oil amount adjusting member, a mechanism capable of discharging a small amount of lubricating oil to the oil supply pump is provided, and from there to the oil supply point without using the oil amount adjusting member. A direct connection method using a tube or the like is conceivable. However, if there is a difference in level between the oil supply location and the oil supply pump as in the prior art, the pump pressure for discharging a small amount of lubricant is very small. There is a problem that the lubricating oil is not transported normally because the pump pressure is lost due to gravity.

  Accordingly, an object of the present invention is to reduce the amount of lubricating oil from the lubricating oil discharged from the oil pump disposed on the bed to the sliding member in the arm while omitting the adjustment of the lubricating oil by the oil amount adjusting member and the oil amount adjusting member. An object of the present invention is to provide an oil supply device for a sewing machine that can stably supply lubricating oil.

In order to solve the above-described problems, a sewing machine oil supply device according to the present invention includes a sewing machine bed connected to the oil reservoir above the oil reservoir, a sewing arm arranged to be connected to the sewing bed above the sewing bed, A lower shaft that is rotatably supported by the sewing machine bed, an upper shaft that is rotatably supported by the sewing machine arm, and a first shaft that is disposed in the sewing machine bed and supplies lubricating oil in a sump to the sewing machine arm and the sewing machine bed. In a sewing machine oil supply device comprising one pump and transport means for transporting lubricating oil taken into the first pump into the sewing machine arm, the sewing machine arm is fixed to a frame above the sewing machine arm and via a speed reduction mechanism. A second pump that operates in conjunction with the rotation of the upper shaft, and the second pump includes an introducing means for taking the lubricating oil transported by the transport means into the second pump, and an introducing means. Ri elaborate be provided with at least a portion supply for supplying to the sliding member in the sewing machine arm means of the lubricating oil, characterized in.

  The second pump includes a casing that forms the body of the second pump. The second pump is operated by rotation of the second pump shaft that is rotatably supported by the casing, and the speed reduction mechanism is fixed to the upper shaft. The first worm to be fixed, the first worm wheel fixed to the rotating shaft arranged in the casing and engaged with the first worm, the second worm fixed to the rotating shaft, and fixed to the second pump shaft And a second worm wheel engaged with the second worm.

  According to the present invention, the second pump that is disposed in the sewing machine arm and interlocked with the rotation of the upper shaft is provided together with the oil pump disposed in the sewing machine bed, and the inside of the sewing machine arm passes through the second pump from the fuel pump. By transporting the lubricating oil to the sliding member, there is no need to adjust the amount of oil supply according to the operating conditions of the sewing machine, and a small amount of lubricating oil required for the sliding member in the sewing machine arm can be supplied stably. can do.

It is a partially broken front view of a flat stitch sewing machine to which the present invention is applied. It is the (a) left view and (b) front view of a divider | distributor. It is a disassembled perspective view of a 2nd pump. It is a perspective view of a 2nd pump and a speed-reduction mechanism. It is the (a) left side view which shows the structure of the 2nd pump shaft of a 2nd pump, (b) cc sectional drawing of Fig.5 (a). It is front sectional drawing of a 2nd pump. It is a front view which shows the principal part of the oil supply apparatus of the sewing machine of this invention. It is the principal part front view which showed the behavior in 1 cycle of a 2nd pump. It is a conceptual diagram which shows the relationship between the amount of lubrication oil supplied to a needle bar crank rod, and the rotation speed of a sewing machine. It is a principal part front view which showed the behavior in 1 cycle of the 2nd pump in another Example of this invention. It is ff partial sectional drawing of FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a partial cross-sectional view of a flat stitch sewing machine to which the present invention is applied. As shown in FIG. 1, the sewing machine bed 2 is connected to the oil sump 1 above the oil sump 1. The lower shaft 3 is horizontally disposed in the sewing machine bed 2 and is supported by the sewing machine bed 2 so as to be rotatable. A sewing arm 4 is connected to the upper part of the sewing bed 2. The upper shaft 5 is disposed horizontally on the sewing machine arm 4 and is rotatably supported by the sewing machine arm 4. A timing belt (not shown) is hung on the lower shaft 3 and the upper shaft 5, and the lower shaft 3 and the upper shaft 5 rotate in one direction in conjunction with a drive motor (not shown) for the sewing machine. To do. A crank 6 is fixed to one end of the upper shaft 5 with a screw 11. One end of a pin (not shown) is inserted and fixed to the crank 6, and the other end of the pin is inserted into the upper cylinder portion 7 a of the needle bar crank rod 7, and the upper cylinder portion 7 a is around the axis of the pin. It can be rotated. A pin 8 a of a needle bar holder 8 is inserted into the lower cylinder part 7 b of the needle bar crank rod 7, and a needle bar 9 is fixed to the needle bar holder 8 with a screw 22. The needle bar 9 is supported by a bush 10 press-fitted into the sewing machine arm 4 so as to be movable up and down. With the configuration described above, the needle bar 9 moves up and down in conjunction with the rotation of the upper shaft 5.

  A worm 15 is fixed to the lower shaft 3 with screws 12 in the sewing machine bed 2. The first pump 16 is a known trochoid pump, and the mounting portion 17 a of the first casing 17 that forms the body of the first pump 16 is fixed to the frame of the sewing machine bed 2 with screws 13. The first pump shaft 18 is disposed orthogonal to the lower shaft 3 and is supported by the first casing 17 so as to be rotatable around the shaft. An upper portion of the first pump shaft 18 protrudes from the first casing 17, and a worm wheel 19 is fixed to the protruding portion with screws 14 and 14. The worm 15 and the worm wheel 19 are engaged. When the worm 15, the worm wheel 19 and the first pump shaft 18 are rotated in conjunction with the rotation of the lower shaft 3, the oil reservoir 1 is lubricated by a known pump action. Oil is taken into the first pump 16, and a part of the taken-in lubricating oil is supplied to the sliding member in the sewing machine bed by a transport tube 64 having one end connected to the first pump, and the remaining lubricating oil Is transported to the sewing machine arm 4 by a first transport tube 20 having one end connected to the first pump 16.

  As shown in FIG. 1, an oil receiver 23 and a distributor 24 are connected to the frame portion above the sewing machine arm 4. As shown in FIGS. 2A and 2B, the distributor 24 is provided with a through hole 24a, a vertical hole 24b, and a horizontal hole 24c. The ejection pipe 25 is disposed so as to sandwich the oil receiver 23 with the distributor 24 and is screwed into a vertical hole 24 b opened on the upper surface of the distributor 24. The other end of the first transport tube 20 is connected to a joint 27 fixed to the distributor 24 by a joint screw 26. The joint screw 26 is screwed into the through hole 24a, and the lubricating oil transported from the oil reservoir 1 to the sewing machine arm 4 through the first transport tube 20 is guided to the through hole 24a through the joint 27 and the joint screw 26. . The lubricating oil guided to the through hole 24a is diverted from the through hole 24a to the vertical hole 24b and the horizontal hole 24c. Lubricating oil guided to the vertical hole 24 b is ejected from the ejection pipe 25 toward the upper side of the distributor 24. Part of the lubricating oil ejected from the ejection pipe 25 is supplied to each member in the sewing machine arm 4 through the sewing machine frame. Of the lubricating oil ejected from the ejection pipe 25, the lubricating oil accumulated in the oil receiver 23 is dropped from dropping holes 23 a and 23 a provided in the oil receiver 23 and supplied to the sliding portion in the sewing machine arm 4. . A joint 28 is screwed into the lateral hole 24 c, and the lubricating oil guided to the lateral hole 24 c is guided to the second pump 30 through a second transport tube 29 connected to the joint 28.

  Next, the second pump mechanism will be described. The second casing 31 forming the body of the second pump 30 is fixed to the frame above the sewing machine arm 4 with screws 33 behind the upper shaft 5. As shown in FIGS. 3 and 4, the rotation shaft 34 is perpendicular to the upper shaft 5 and the lower end protrudes from the second casing 31 in the rotation shaft through holes 32, 32 of the second casing 31. It is rotatably supported. A first worm wheel 35 is fixed to the lower end of the rotating shaft 34 with a screw 39, and the first worm wheel 35 engages with a first worm 36 fixed to the middle of the upper shaft 5 with a screw 38. ing. Above the first worm wheel 35, a second worm 37 is disposed opposite to the first worm wheel 35 across the partition wall 31 a of the second casing 31, and is fixed with a screw 40 in the middle of the rotating shaft 34. Has been. The second pump shaft through-hole 41 is formed to be orthogonal to the rotation shaft 34 and to penetrate the second casing 31 in the horizontal direction. Both ends of the second pump shaft 42 protrude from the opening of the second pump shaft through hole 41 and are inserted into the second pump shaft through hole 41 so as to be rotatable around the shaft. The second worm wheel 43 is fixed to one end of the second pump shaft through hole 41 with a screw 44 while being engaged with the second worm 37, and the collar 45 is fixed to the other end with a screw 46. Yes, the movement of the second pump shaft 42 in the axial direction is restricted. As shown in FIG. 5A, an eccentric portion 47 is formed on a part of the outer peripheral surface of the second pump shaft 42. The eccentric portion 47 is formed with a groove portion 47a formed of a groove having a width d over a half circumference along the circumferential direction of the second pump shaft 42. As shown in FIG. 5 (b), the cross-sectional shape of the groove portion 47a in the circumferential direction is an ellipse having a start point 47as and an end point 47ae as the major axis (= the diameter of the second pump shaft 42). As shown in FIG. 6, the groove 47 a is inserted into the second casing 31 to form an oil storage chamber 48 having a volume Va for storing the lubricating oil taken into the second casing 31.

  As shown in FIGS. 3 and 6, the second casing 31 is provided with a screw hole 49, a discharge hole 50, an introduction hole 51, a pin through hole 52, and a discharge hole 53. One end of the discharge hole 50 opens in the second pump shaft through hole 41 of the second casing 31, and the other end opens in the upper surface of the second casing 31. The introduction hole 51 has one end opened to the discharge hole 50 and the second pump shaft through hole 41, and the other end opened to the inclined surface of the second casing 31. The joint 54 is screwed to the other end of the introduction hole 51. As shown in FIGS. 1 and 7, the tubular second transport tube 29 is configured such that a part of the lubricating oil discharged from the lateral hole 24 c of the distributor 24 is guided, and one end thereof is connected to the joint 54. Has been. That is, a part of the lubricating oil discharged from the first pump 16 and the distributor 24 in conjunction with the rotation of the lower shaft 3 and the upper shaft 5 passes through the joint 54 and the introduction hole 51, and the second pump shaft of the second casing 31. The through hole 41 and the groove portion 47a of the second pump shaft 42 fitted in the through hole 41 are guided. Excess lubricating oil introduced into the second casing 31 of the second pump 30 is discharged out of the second casing 31 through the other end of the discharge hole 50. At that time, fine dust mixed in the lubricating oil is discharged. Etc. are also discharged.

  One end of the pin through hole 52 opens into the second pump shaft through hole 41 of the second casing 31, and the other end opens into the left side surface of the second casing 31. The pin 55 is inserted into the pin through hole 52 so as to be movable left and right. The diameter of the pin 55 is equal to the width d of the groove portion 47a of the eccentric portion 47 formed in the second pump shaft 42, and the pin through hole is formed so that the right end portion of the pin 55 is engaged with the groove portion 47a without any gap. 52 is positioned. The leaf spring 56 is a means for elastically pressing the pin 55 rightward, that is, toward the second pump shaft 42, and its base end is fixed to the second casing 31 by screwing a screw 57 into the screw hole 49. In addition, the tip is elastically in contact with the left end of the pin 55.

  The discharge hole 53 is located below the pin through hole 52, and one end is opened to the second pump shaft through hole 41 of the second casing 31, and the other end is opened to the inclined surface of the second casing 31. The joint 58 is screwed to the other end of the discharge hole 53. As shown in FIGS. 1 and 7, one end of a tubular supply tube 59 is connected to a joint 58, and the other end is connected to an oil supply pipe 60 positioned above the needle bar crank rod 7. A part of the oil supply pipe 60 is fixed to the frame, and a tip is opened downward toward the needle bar crank rod 7. By the operation of the second pump 30, the lubricating oil discharged from the discharge hole 53 is dripped from the opening of the oil supply pipe 60 via the supply tube 59 and guided to the needle bar crank rod 7.

  The operation of the oiling device for a sewing machine configured as described above will be described below. When the lower shaft 3 is rotated by a drive source of a sewing machine (not shown), the first pump 16 is operated by rotating the first pump shaft 18 in conjunction with the lower shaft 3 via the worm 15 and the worm wheel 19. . By the operation of the first pump 16, the lubricating oil in the oil sump 1 is taken into the first pump 16, and the taken-in lubricating oil is disposed in the sewing machine arm 4 through the first transport tube 20, the joint 27, and the joint screw 26. It is transported to the distributor 24. A part of the lubricating oil transported to the distributor 24 is transported to the second pump 30 through the through hole 24a, the lateral hole 24c, the joint 28, and the second transport tube 29, and the remaining lubricating oil is transported to the through hole 24a, the vertical hole. It is supplied into the sewing machine arm 4 through the hole 24 b and the ejection pipe 25.

  Next, the operation of one cycle of the second pump 30 will be described with reference to FIG. The parts shown in FIGS. 8B to 8D are the same as those in FIG. When the upper shaft 5 rotates, the rotation shaft 34 rotates through the first worm 36 and the second worm wheel 35. When the rotation shaft 34 rotates, the second worm 37 and the second worm wheel 43 are moved. The second pump shaft 42 rotates through the gap. The second pump shaft 42 rotates in the direction R around the shaft (clockwise as viewed from the front of the sewing machine).

  As shown in FIGS. 5 and 8A, when the second pump shaft 42 rotates and the start point 47 as of the groove 47 a of the eccentric portion 47 passes through the pin 55, the oil receiving chamber 48 is positioned above the pin 55. The lubricating oil guided to the introduction hole 51 is filled into the oil storage chamber 48. When the second pump shaft 42 further rotates and the end point 47ae of the groove 47a passes the pin 55, the entire oil storage chamber 48 communicates with the introduction hole 51 and the discharge hole 50 as shown in FIG. Excess lubricating oil exceeding the volume Va of the chamber 48 is discharged from the discharge hole 50, and an amount of lubricating oil equal to the volume Va of the oil storing chamber 48 is filled in the oil storing chamber 48. Then, as shown in FIG. 8C, the second pump shaft 42 rotates while holding the volume Va of lubricating oil in the oil storage chamber 48 until the start point 47 as of the groove 47 a reaches the pin 55 again. . As shown in FIG. 8D, when the starting point 47as of the groove 47a reaches the pin 55 and the second pump shaft 42 is further rotated, the lubricating oil filled in the oil storage chamber 48 is fitted into the groove 47a without any gap. The lubricating oil that has been blocked by the inserted pin 55 and that can no longer be held in the oil storage chamber 48 as the volume of the oil storage chamber 48 in front of the pin 55 gradually decreases as the second pump shaft 42 rotates is discharged. It is discharged into the hole 53. When the end point 47 ae of the groove 47 a reaches the pin 55 again, all of the volume Va of lubricating oil held in the oil storage chamber 48 is discharged to the discharge hole 53.

  Lubricating oil discharged to the discharge hole 53 is transported into the oil supply pipe 60 via a joint 58 fitted in the discharge hole 53 and a supply tube 59 connected to the joint 58, and from the opening of the oil supply pipe 60. It is dripped. The lubricating oil dripped from the hole lubricates the needle bar crank rod 7.

According to the speed reduction mechanism 63 including the first worm 36, the first worm wheel 35, the second worm 37, and the second worm wheel 43 of the second pump mechanism configured as described above, the first worm 36 and the second worm If the number 37 is a1 and a2, and the number of teeth of the first worm wheel 35 and the second worm wheel 43 is b1 and b2, the reduction ratio of the second pump shaft 42 to the upper shaft 5 is a1 * a2 / b1 * b2. It becomes. In this embodiment, a1 <b1 and a2 <b2 are set, and the pump shaft connected by a pair of worms and worm wheels from the upper shaft 5 is compared with the reduction ratio obtained with respect to the upper shaft 5. The second pump shaft 42 can obtain a very large reduction ratio with respect to the upper shaft 5 by the speed reduction mechanism 63. That is, the second pump 30 can discharge a very small amount of lubricating oil while interlocking with the upper shaft 5.

  Further, the second pump 30 has a very simple structure. For example, when the first pump 16 is a trochoid pump, the pressure loss is very small as compared with this, and a part of the oil storage chamber 48 for taking in the lubricating oil. It is easy to increase the processing accuracy of the groove 47a for forming the. 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 disposed in the sewing machine arm 4 in a compact manner.

  FIG. 9 is a conceptual diagram showing the relationship between the amount of lubricating oil supplied to the needle bar crank rod 7 and the sliding state of the needle bar crank rod 7. The horizontal axis represents the rotational speed of the upper shaft 5, and the vertical axis represents The amount of oil supplied to the needle bar crank rod 7 is taken. A dotted line La indicates a threshold value for oil leakage, and an area above La is a region where oil leakage from the needle bar 9 occurs. An alternate long and short dash line Lb indicates a threshold value for wear and seizure, and a region below Lb is a region where the needle bar crank rod 7 is worn and seized. Therefore, it is desirable that the amount of oil supply be set at an intermediate position between La and Lb as indicated by the solid line L. However, according to the applicant's verification, the amount of oil supply as indicated by the solid line L is extremely small, In the mechanism, that is, in the present embodiment, when only the first pump 16 is provided, it is very difficult to stably guide the oil supply amount indicated by the solid line L to the needle bar crank rod 7. By providing the second pump 30 of the present embodiment with the reduction ratio and the volume of the oil storage chamber 48 appropriately set, the amount of oil supply along the solid line L in FIG. 9 can be supplied to the needle bar crank rod 7.

  In addition, since the second pump 30 is disposed in the sewing machine arm 4, the pump (second pump 30), the oil guide path (supply tube 59), and the oil supply pipe are used for oil supply to the sliding portion in the machine arm 4. The height difference of 60 can be eliminated, and a small amount of lubricating oil can be stably supplied.

  The second pump 30 of the present invention is not limited to the structure of the present embodiment, and may be a known plunger pump that operates by the rotation of the second pump shaft 42, for example. In the present embodiment, the lubricating oil discharged from the second pump 30 is supplied to the needle bar crank rod 7 through the oil supply pipe 60 connected to the supply tube 59. However, the lubricating oil is supplied to other sliding members. You may do it.

  Only a difference of the second embodiment of the second pump from the first embodiment will be described with reference to FIGS.

  As shown in FIG. 10, the second casing 31 is provided with an introduction hole 51, a discharge hole 50, a discharge hole 53, and a pin through hole 52. The introduction hole 51 has one end opened to the second pump shaft through hole 41 of the second casing 31 and the other end opened to the outer surface of the second casing 31. One end of the discharge hole 50 opens to the introduction hole 51, and the other end opens to the upper surface of the second casing 31. An extension line of the central axis of the introduction hole 51 is also set as the central axis, and one end opens to the second pump shaft through hole 41 of the second casing 31 and the other end opens to the outer surface of the second casing 31. Is formed. One end of the pin through hole 52 opens into the second pump shaft through hole 41 of the second casing 31, the other end opens into the lower surface of the second casing 31, and the pin 55 extends into the pin through hole 52. It is inserted to move up and down.

  A second eccentric portion 61 is formed on a part of the outer peripheral surface of the second pump shaft 65 inserted through the second pump shaft through hole 41 of the second casing 31. The second eccentric portion 61 is formed with a second groove portion 61 a composed of a groove having a width e over a half circumference along the circumferential direction of the second pump shaft 65. As shown in FIG. 11, the second groove 61a is formed larger than the diameter of the pin 55, and there is a gap with the second groove 61a around the top of the pin 55. Engages with the two groove portions 61a. The second groove portion 61 a is fitted into the second casing 31 to form a second oil storage chamber 62 having a volume Vb for storing lubricating oil taken into the second casing 31.

  The operation of one cycle of the second pump 30 will be described with reference to FIG. In addition, since each site | part shown in FIG.10 (b) thru | or FIG.10 (d) is the same as that of Fig.10 (a), some code | symbol is abbreviate | omitted. When the upper shaft 5 rotates, the rotation shaft 34 rotates through the first worm 36 and the first worm wheel 35, and when the rotation shaft 34 rotates, the second worm 37 and the second worm wheel 43 are moved. The second pump shaft 65 rotates through the gap. The second pump shaft 65 rotates in the direction R around the shaft (clockwise as viewed from the front of the sewing machine).

  As shown in FIG. 10A, when the second pump shaft 65 rotates and the start point 61 as of the second groove 61 a of the second eccentric portion 61 passes through the introduction hole 51, the lubricating oil introduced to the introduction hole 51. Is filled in the second oil storage chamber 62. When the second pump shaft 65 further rotates and the end point 61ae of the second groove 61a passes the pin 55 as shown in FIG. 10B, excess lubricating oil exceeding the volume Vb of the second oil storage chamber 62 is obtained. Is discharged from the discharge hole 50, and the second oil storage chamber 62 is filled with lubricating oil in an amount equal to the volume Vb of the second oil storage chamber 62. Then, as shown in FIG. 10C, when the starting point 61as of the second groove 61a reaches the pin 55 and the second pump shaft 65 rotates, the lubricating oil filled in the second oil storage chamber 62 is reached. Among them, an amount of lubricating oil equal to the volume v of the portion engaged with the second groove portion 61 a of the pin 55 is discharged to the discharge hole 53. As shown in FIG. 10D, when the end point 61ae of the second groove 61a passes through the discharge hole 53, the second oil storage chamber 62 stores the amount of lubricating oil of Vb-v. Become.

  Therefore, the second pump in the first embodiment can discharge the lubricating oil corresponding to the volume Va of the oil storage chamber 48, whereas the second pump in the second embodiment is a portion that engages with the second groove 61a of the pin 55. Therefore, a very small amount of lubricating oil can be discharged. A second pump having a different discharge amount can be set according to the amount of lubricating oil required for the sliding member in the sewing machine arm.

DESCRIPTION OF SYMBOLS 1 Oil sump 2 Sewing machine bed 3 Lower shaft 4 Sewing arm 5 Upper shaft 7 Needle bar crank rod 16 1st pump 20 1st transport tube 23 Oil receiver 24 Distributor 25 Jet pipe 29 2nd transport tube 30 2nd pump 34 Rotation Shaft 35 First worm wheel 36 First worm 37 Second worm 42 Second pump shaft 43 Second worm wheel 47 Eccentric portion 47a Groove portion 48 Oil storage chamber 59 Supply tube 60 Oil supply pipe 61 Second eccentric portion 61a Second groove portion 62 First 2 Oil storage chamber 63 Reduction mechanism 65 Second pump shaft

Claims (2)

A sewing machine bed connected to the oil reservoir above the oil reservoir, a sewing machine arm arranged to be connected to the sewing bed above the sewing bed, a lower shaft rotatably supported by the sewing bed, and a sewing arm An upper shaft that is rotatably supported, a first pump that is disposed in the sewing machine bed and supplies lubricating oil in a sump to the sewing machine arm and the sewing machine bed, and lubricating oil that is taken into the first pump is supplied to the sewing machine arm. 2. Description of the Related Art In a sewing machine refueling device including a transporting means for transporting, a second pump is provided in a sewing machine arm, which is fixed to a frame above the sewing machine arm and operates in conjunction with rotation of an upper shaft via a speed reduction mechanism. The second pump includes an introducing means for taking the lubricating oil transported by the transportation means into the second pump, and sliding at least a part of the lubricating oil taken by the introducing means in the sewing machine arm. Characterized in that it comprises a supply means for supplying to the timber, the oil supply device of the sewing machine.   The second pump includes a casing that forms a body of the second pump. The second pump is operated by the rotation of the second pump shaft that is rotatably supported by the casing, and the speed reduction mechanism is fixed to the upper shaft. A first worm, a first worm wheel fixed to the rotating shaft disposed in the casing and engaged with the first worm, a second worm fixed to the rotating shaft, and a second worm fixed to the second pump shaft. The oil supply device for a sewing machine according to claim 1, further comprising a second worm wheel engaged with the two worms.

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