JP2007319282A - Oil tank of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil tank of a sewing machine capable of easily and highly efficiently discharging foreign matter accumulated in a return oil chamber. <P>SOLUTION: A tank body 21 of this oil tank 9 is provided with a partition wall 50 partitioning the tank body 21 into the return oil chamber 70 and an oil supply chamber 80. An interval between one end part 51 of the partition wall 50 and the inner face of a back wall 25 is formed with an inflow passage 29 for allowing the inflow of return oil in the return oil chamber 70 to the inside of the oil supply chamber 80. A third bottom wall 27c in the side of the back wall 25 is provided with an outlet 38 for discharging oil and impurities in the tank body 21. When discharging oil in the tank body 21, the oil tank 9 is inclined to move the oil to the side of the back wall 25. In this case, the impurities accumulated inside the return oil chamber 70 can be moved onto the third bottom wall 27c. The oil and the impurities can be easily discharged by removing a screw 48 of the outlet 38. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oil tank for a sewing machine, and more particularly, to an oil tank for a sewing machine that contains lubricating oil for supply and can separate and store impurities such as metal powder mixed in return oil.

  2. Description of the Related Art Conventionally, it is known that in an electric sewing machine used at high speed rotation, it is indispensable to supply lubricating oil to a rotating and sliding portion of a bearing metal or the like from the viewpoint of durability. In particular, oil supply to the needle bar vertical movement mechanism, the rotary hook drive mechanism, and the like is important. For example, when the amount of oil supply is small, each mechanism may generate heat and cause seizure. On the other hand, when the amount of oil supply is large, oil dripping occurs from each mechanism, and the lubricant oil adheres to the work cloth and the sewing thread, which may cause the quality of the sewing product to deteriorate.

  In order to prevent these problems, an oil tank type dry type sewing machine in which a hermetic oil tank is attached to the sewing machine frame, and the lubricating oil contained in the oil tank is lubricated by the required amount to the drive and sliding parts with a pump. Is being used. In this type of sewing machine, the lubricating oil stored inside is supplied to the upper shaft metal and the driving portion of the shuttle, and the lubricated lubricating oil is collected in an oil tank by a pump. However, the lubricant collected in the oil tank may be contaminated with impurities such as metal pieces (metal powder) of the drive unit and thread scraps from the sewing thread, and the impurities accumulated at the bottom will enter the drive unit together with the lubricant. There was a fear of being supplied.

Therefore, for example, a sealed box-like tank body is provided with a partition wall that partitions the inside of the tank body into a return oil chamber that contains return oil and an oil supply chamber that is connected to an oil pump and contains oil for oil supply, An oil tank for a sewing machine is known in which a notch for returning oil from the oil chamber to the oil supply chamber is formed in the upper part of the partition wall (see, for example, Patent Document 1). In this oil tank, impurities mixed in the return oil can be precipitated at the bottom of the return oil chamber. Then, only the supernatant of the return oil accumulated in the return oil chamber can be allowed to flow into the oil supply chamber from the notch. In addition, when all the oil in the oil tank is replaced, the lubricating oil in the oil tank is discharged from the discharge port to the outside by tilting the sewing machine frame. Further, since a stepped raised bottom is formed in the return oil chamber, the amount of oil remaining in the return oil chamber can be reduced.
JP 2006-87810 A

  However, in the oil tank of the sewing machine described in Patent Document 1, the return oil chamber is completely partitioned by the partition wall. As a result, when the impurities precipitated in the return oil chamber are taken out, there is a problem that the impurities in the return oil chamber that are completely partitioned remain in the corners of the return oil chamber and cannot be easily taken out. In addition, since the oil discharge port is on the oil supply chamber side at the bottom of the tank body, impurities accumulated in the return oil chamber must be moved to the oil supply chamber, which is inefficient.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sewing machine oil tank that can easily and efficiently discharge foreign matter accumulated in a return oil chamber.

  To achieve the above object, an oil tank for a sewing machine according to a first aspect of the present invention is a lubricating oil that is erected on the inner surface of a rectangular parallelepiped tank body and the bottom wall of the tank body, and flows out of the tank body. A partition wall that partitions the oil supply chamber that stores the return oil from outside the tank body, the oil supply chamber side of the tank body, and the lubricating oil in the oil supply chamber is supplied to the tank body. An outflow port for flowing out and an inflow port provided on the return oil chamber side of the tank body and allowing the return oil from outside the tank body to flow into the return oil chamber are attached to the machine frame. In the oil tank of the sewing machine, one end of the partition wall is connected to the inner surface of the first side wall of the tank body, and the other end opposite to the one end of the partition wall is connected to the first side wall. Opposing second The oil supply chamber is disposed apart from the inner surface of the wall and is provided between the inner surface of the second side wall of the tank body and the other end of the partition wall, and the return oil in the return oil chamber is supplied to the oil supply chamber. An inflow passage for inflowing into the tank body, a discharge port provided on the return oil chamber side of the bottom wall of the tank body, for discharging foreign matter mixed in the return oil to the outside of the tank body, and the discharge port And a plug member for closing.

  According to a second aspect of the present invention, in addition to the structure of the first aspect of the invention, the other end of the partition wall is bent toward the return oil chamber.

  According to a third aspect of the oil tank for a sewing machine of the present invention, in addition to the configuration of the first or second aspect, the first side wall side of the bottom wall is lower than the second side wall side. ing.

  In addition to the configuration of the invention according to claim 2 or 3, the oil tank of the sewing machine of the invention according to claim 4 is characterized in that the bottom wall includes a first bottom wall disposed on the second side wall side. , Disposed on the side of the first side wall, disposed between the second bottom wall lower than the first bottom wall, the first bottom wall, and the second bottom wall, and the second A third bottom wall inclined from the bottom wall side toward the first bottom wall side, and the other end portion of the partition wall includes the third bottom wall and the first bottom wall. And is placed on the boundary.

  According to a fifth aspect of the oil tank of the sewing machine of the present invention, in addition to the configuration of the first or second aspect, the second side wall side of the bottom wall is lower than the first side wall side. ing.

  According to a sixth aspect of the present invention, in the sewing machine oil tank according to the sixth aspect, in addition to the configuration of the first aspect, the discharge port is provided on the second side wall side of the bottom wall. ing.

  According to a seventh aspect of the present invention, there is provided an oil tank for a sewing machine according to the seventh aspect of the invention, in addition to the structure of the first aspect of the invention, wherein the outflow port is provided at a lower portion of the first side wall on the oil supply chamber side. A rib surrounding the outflow port is provided in the vicinity of the outflow port of the bottom wall.

  In the oil tank of the sewing machine according to the first aspect, the lubricating oil accommodated in the oil supply chamber flows out of the tank body from the outflow port, and return oil from the outside of the tank body flows into the return oil chamber from the inflow port. Thereby, the return oil in the return oil chamber flows into the oil supply chamber via the inflow passage. The foreign matter mixed in the return oil sinks without reaching the inflow passage due to its own weight, and accumulates in the return oil chamber. With such a simple configuration, the return oil and impurities can be easily separated. And since the discharge port is provided in the return oil chamber side of the bottom wall of the tank body, the oil in the tank body and the foreign matter accumulated in the return oil chamber can be easily removed by removing the plug member from the discharge port. And can be discharged efficiently.

  In the oil tank for the sewing machine according to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the other end of the partition wall is bent toward the return oil chamber. Part of the return oil that flows toward the bottom flows along the shape of the other end of the partition wall. That is, the return oil flows once toward the return oil chamber and then flows toward the inflow passage. As a result, even when foreign matter flows toward the second side wall due to the flow of return oil, it can be pushed away toward the return oil chamber, so that foreign matter can be prevented from flowing into the oil supply chamber via the inflow passage.

  In addition, in the oil tank for the sewing machine according to the third aspect, in addition to the effect of the first aspect, the first side wall side of the bottom wall is lower than the second side wall side. Foreign matter accumulated in the return oil chamber can be accumulated on the first side wall side of the bottom wall. And since the foreign material collected on the 1st side wall side becomes difficult to flow to the 2nd side wall side higher than the 1st side wall side, it can prevent that a foreign material flows in into a fuel supply chamber.

  In addition, in the oil tank for a sewing machine according to a fourth aspect of the invention, in addition to the effect of the invention according to the second or third aspect, the third bottom wall is directed from the second bottom wall side to the first bottom wall side. Accordingly, the foreign matter mixed in the return oil can be dropped onto the second bottom wall along the third bottom wall. Furthermore, since the other end portion of the partition wall is disposed at the boundary between the third bottom wall and the first bottom wall, the foreign matter on the third bottom wall flows into the return oil chamber side. Can be pushed back onto the second bottom wall. Thereby, it can prevent that a foreign material flows into an oil supply chamber via an inflow passage.

  Moreover, in the oil tank of the sewing machine of the invention according to claim 5, in addition to the effect of the invention of claim 1 or 2, the second side wall side of the bottom wall is lower than the first side wall side. Foreign matter accumulated in the return oil chamber can be accumulated on the second side wall side of the bottom wall.

  Further, in the oil tank for the sewing machine according to the sixth aspect of the invention, in addition to the effect of the invention according to any one of the first to fifth aspects, the discharge port is provided on the second side wall side of the bottom wall. By tilting the tank body toward the second side wall, the foreign matter accumulated in the return oil chamber and the lubricating oil in the tank body can be easily discharged.

  Further, in the oil tank for the sewing machine according to the seventh aspect of the invention, in addition to the effect of the invention according to any one of the first to sixth aspects, the outflow port is provided at a lower portion on the oil supply chamber side of the first side wall. Therefore, the lubricating oil accommodated in the oil supply chamber can be discharged from the outlet. As a result, the amount of residual oil in the oil supply chamber can be reduced. Furthermore, even when the foreign matter remains in the lubricating oil in the oil supply chamber and flows to the outlet, the foreign matter can be blocked by the rib provided in the vicinity of the outlet on the bottom wall. Thereby, it can prevent that a foreign material flows out of a tank main body from an outflow port.

  Hereinafter, an oil tank 9 of an electronic sewing machine 1 according to an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view of the electronic sewing machine 1, FIG. 2 is an explanatory view showing an oil circulation path in the oil tank 9 and the oil pump 8, and FIG. 3 is a cross-sectional view of the oil pump 8. 4 is a perspective view of the oil tank 9, FIG. 5 is a front view of the oil tank 9, FIG. 6 is a plan view of the oil tank 9, and FIG. 7 is a line AA shown in FIG. 8 is a sectional view taken in the direction of the arrow, FIG. 8 is a partially broken side view of the electronic sewing machine 1, FIG. 9 is a partially broken side view of the electronic sewing machine 1 when tilted, and FIG. 10 is a modified example. 2 is a cross-sectional view of an oil tank 90. FIG.

  In addition, the oil tank 9 of this embodiment is attached to the sewing machine frame 5 of the bed part 2 of the electronic sewing machine 1, as shown in FIG. The oil tank 9 contains oil for lubricating the upper shaft metal of the electronic sewing machine 1 and the driving portion of the shuttle, and receives return oil recovered by the oil supply pump 8. The feature of the present invention is that impurities mixed in the return oil flowing into the tank body 21 (see FIG. 4) can be easily separated, and the separated impurities can be easily discharged out of the tank body 21. I have.

  First, the configuration of the electronic sewing machine 1 will be schematically described. The electronic sewing machine 1 shown in FIG. 1 is the same as a general household electronic sewing machine. The electronic sewing machine 1 includes a bed 2 serving as a base installed on a work table (not shown), a pedestal 3 erected from the right end toward the front of the bed 2, An arm portion 4 extending leftward from the upper end of the pedestal portion 3 so as to face the bed portion 2 is provided.

  Inside the arm portion 4, a needle bar vertical movement mechanism (not shown) for moving the needle bar up and down by a main shaft driven by a sewing machine motor (not shown), and a balance drive mechanism (not shown) for driving the balance. Etc. are provided. The bed portion 2 includes a rotary hook 7 (see FIG. 2) driven by a hook shaft (lower shaft) 6 that rotates in synchronization with the main shaft, and a plunger-type oil pump 8 provided on the hook shaft 6. And an oil tank 9 for supplying lubricating oil to the rotary hook 7 by the oil supply pump 8.

  Next, the oil supply pump 8 will be described. As shown in FIGS. 2 and 3, the oil supply pump 8 includes a pump metal 11 as a cylindrical bearing metal that rotatably supports the shuttle shaft 6. The oil pump 8 includes an oil passage 11 a formed inside the pump metal 11, an eccentric portion 6 a provided in a portion of the hook shaft 6 located in the middle of the oil passage 11 a, and an eccentric portion of the pump metal 11. A plunger pin 12 (see FIG. 3) provided in a portion corresponding to the portion 6a, a compression coil spring 13 (see FIG. 3) for biasing the plunger pin 12, and the plunger pin 12 and the compression coil spring 13 The screw 14 for attaching to the pump metal 11 is provided. The shuttle shaft 6 is formed with an oil passage 6b (see FIG. 2) for supplying the oil in the oil passage 11a to the rotary hook 7.

  Further, suction ports 15 and discharge ports 16 are provided at both ends of the oil passage 11a. The suction port 15 is connected to the oil supply port 32 of the oil tank 9 through the supply tube 18. On the other hand, the discharge port 16 is connected to a return port 31 of the oil tank 9 via a return tube 19. An adjustment valve 20 for adjusting the amount of oil supplied to the rotary hook 7 through the oil passage 6b is provided in the middle of the return tube 19.

  Next, the operation of the oil supply pump 8 will be described. As shown in FIG. 2, the hook shaft 6 is rotated in a predetermined rotational direction during sewing. Then, since the inside of the oil passage 11 a near the suction port 15 becomes negative pressure, the oil in the oil tank 9 is sucked into the oil supply pump 8 through the supply tube 18. Next, the oil sucked into the oil supply pump 8 is transferred by friction between the eccentric portion 6 a and the inner surface of the pump metal 11 as the hook shaft 6 rotates. As shown in FIG. 3, the plunger pin 12 slides on the eccentric portion 6a by the spring force of the compression coil spring 13, so that the oil moves in the oil passage 11a toward the discharge port 16 as shown in FIG. Are sent out. At this time, a part of the oil passing through the oil passage 11 a is supplied to the rotary hook 7 through the oil passage 6 b according to the adjustment amount of the adjustment valve 20, and the rest passes through the return tube 19 from the discharge port 16. And returned to the oil tank 9 for recovery. The oil returned from the rotary hook 7 through the return tube 19 to the oil tank 9 is referred to as “return oil”.

  Next, the structure of the oil tank 9 that is a feature of the present invention will be described. As shown in FIGS. 4 to 6, the oil tank 9 includes a transparent airtight container-like tank body 21 made of synthetic resin. The tank body 21 includes a front wall 22, a left side wall 23, a right side wall 24, a back wall 25, a top wall 26 and a bottom wall 27, and the whole is formed in a rectangular parallelepiped shape. Further, flange-like fixing portions 41 and 42 extending horizontally are integrally formed on the outer surfaces of the left side wall 23 and the right side wall 24. Then, the oil tank 9 can be installed in the bed portion 2 by fixing these fixing portions 41 and 42 to the sewing machine frame 5 of the bed portion 2.

  Furthermore, the bottom wall 27 is raised stepwise from the front side toward the rear side. The bottom wall 27 is disposed on the front wall 22 side, and has a first bottom wall 27a having a horizontal plane, and a first horizontal wall disposed on the back wall 25 side and disposed on a level higher than the first bottom wall 27a. A third bottom wall 27c and a second bottom wall 27b disposed between the first bottom wall 27a and the third bottom wall 27c and inclined obliquely upward from the first bottom wall 27a toward the third bottom wall 27c. It consists of and.

  On the other hand, on the left side of the inner surface of the bottom wall 27 in the tank main body 21, a partition wall 50 that is arranged in parallel to the left side wall 23 and the right side wall 24 and divides the inside of the tank main body 21 into two regions is erected. ing. An oil supply chamber 80 is formed on the right side of the partition wall 50 to store oil supplied to the rotary hook 7. Further, a return oil chamber 70 is formed on the left side of the partition wall 50 to receive and store the return oil collected from the rotary hook 7 via the return tube 19. One end of the partition wall 50 is connected to the inner surface of the front wall 22, and the other end 51 opposite to the one end is disposed at a boundary portion between the second bottom wall 27b and the third bottom wall 27c. At the same time, it is bent toward the return oil chamber 70. The bending angle of the other end 51 of the partition wall 50 is adjusted so that the tip of the partition wall 50 faces a discharge port 38 to be described later. This effect will be described later. An inflow passage 29 is formed between the other end 51 of the partition wall 50 and the inner surface of the back wall 25 to allow the return oil accommodated in the return oil chamber 70 to flow into the oil supply chamber 80. Yes.

  In addition, a return port 31 through which return oil flows into the return oil chamber 70 is provided on the upper left side of the front wall 22, and a tube attachment portion 61 for attaching the return tube 19 to the return port 31 is provided in the return port 31. Is fixed. An oil supply port 32 is provided at the lower center of the front wall 22 for allowing the oil contained in the oil supply chamber 80 to flow out of the tank body 21. The supply tube 18 is connected to the oil supply port 32 through the oil supply port 32. A tube attaching portion 62 for attaching to the tube is fixed. Furthermore, a cylindrical injection port 33 for injecting oil into the oil supply chamber 80 is provided on the right side of the oil supply port 32 of the front wall 22, and the injection port 33 is blocked by a synthetic resin plug 47. Yes. A sub oil supply port 34 is provided on the upper right side of the front wall 22, and a tube for attaching a supply tube 44 for supplying oil to the needle bar vertical movement mechanism to the sub oil supply port 34. The attachment portion 64 is fixed. Further, a sub oil supply port 35 for supplying oil to the oil gauge 17 (see FIG. 1) via an oil tube 36 (see FIG. 1) is provided at the lower part of the right side wall 24. The tube attachment part 65 for attaching the oil tube 36 to the sub oil supply port 35 is fixed.

  In the tank body 21, a U-shaped partition wall 55 arranged so as to surround the injection port 33 is fixed to a portion of the inner surface of the front wall 22 corresponding to the injection port 33. ing. Inside the partition wall 55, an inclined surface 56 that is inclined obliquely upward from the inlet 33 toward the rear of the tank main body 21 is provided. Further, an injection passage 57 for allowing the oil injected from the injection port 33 to flow into the oil supply chamber 80 is formed by the inner surface of the partition wall 55 and the inclined surface 56.

  Therefore, when injecting new oil into the oil tank 9, first, the oil tank 9 is tilted so that the front wall 22 of the tank body 21 faces upward. Next, oil is injected from the injection port 33. Then, since the injected oil flows along the injection passage 57, it can be efficiently supplied into the oil supply chamber 80. The injection passage 57 is isolated from the oil supply chamber 80 by the partition wall 55. Therefore, when the tank body 21 is returned to the original posture, the oil in the oil supply chamber 80 does not leak from the inlet 33.

  In addition, a rib 59 that protrudes in a semicircular arc shape in plan view so as to surround the fuel filler port 32 is provided on the inner surface of the first bottom wall 27 a corresponding to the fuel filler port 32. A cylindrical discharge port 38 for discharging oil and impurities in the tank main body 21 to the outside of the tank main body 21 is provided on the inner surface of the third bottom wall 27c on the return oil chamber 70 side. The discharge port 38 protrudes below the tank body 21, and a screw 48 for closing the discharge port 38 is tightened and fixed to the discharge port 38 via a synthetic resin packing 91. Yes.

  Next, a return oil separation processing method using the oil tank 9 having the above-described configuration will be described. It is assumed that a predetermined amount of oil is stored in the tank body 21 in advance. As shown in FIG. 2, the return oil discharged from the discharge port 16 of the oil supply pump 8 flows into the return oil chamber 70 from the return port 31 of the tank body 21 via the return tube 19. On the other hand, the oil stored in the oil supply chamber 80 flows out of the tank body 21 from the oil supply port 32 and is sucked into the oil supply pump 8 through the supply tube 18. As a result, the oil in the return oil chamber 70 is drawn into the oil supply chamber 80 through the inflow passage 29, so that the oil flowing from the return oil chamber 70 to the oil supply chamber 80 through the inflow passage 29 is introduced into the tank body 21. A flow is formed.

  Then, the return oil that has flowed into the return oil chamber 70 flows toward the rear of the tank body 21. Furthermore, impurities (for example, chips, lint, etc.) mixed in the return oil sink due to their own weight. Therefore, since impurities accumulate in the first bottom wall 27a, only the oil from which the impurities have been removed flows toward the rear (back wall 25 side). Here, the impurities accumulated in the first bottom wall 27a may flow backward due to the flow of return oil. Therefore, in the oil tank 9 of the present embodiment, since the second bottom wall 27b is inclined obliquely upward toward the rear, impurities cannot rise up the second bottom wall 27b, and the first bottom wall 27a. Fall on top. Therefore, impurities can be accumulated in the first bottom wall 27a.

  Furthermore, since the other end 51 of the partition wall 50 is bent toward the return oil chamber 70, the oil that flows along the partition wall 50 flows toward the left side wall 23. As a result, the oil flowing through the second bottom wall 27 b is once pushed back to the left side wall 23 side and then moves toward the inflow passage 29. That is, even if impurities flow on the second bottom wall 27b, they can be dropped along the second bottom wall 27b by the flow of oil toward the left side wall 23, so that the impurities are pushed back to the first bottom wall 27a. be able to.

  Further, since the other end 51 of the partition wall 50 is disposed at the boundary portion between the second bottom wall 27b and the third bottom wall 27c, the oil flow toward the left side wall 23 is transferred to the third bottom wall 27c. Can be formed in front of. Thereby, even when the impurity moves to the upper part of the second bottom wall 27b, it can be pushed back to the first bottom wall 27a by the flow of oil toward the left side wall 23.

  As described above, the return oil in the return oil chamber 70 can be easily separated into oil and impurities. Then, only the separated oil can flow into the oil supply chamber 80 through the inflow passage 29. As a result, the oil supply chamber 80 is always filled with oil from which impurities have been removed, so that the oil in the tank body 21 can be repeatedly supplied to the rotary hook 7 for use. By the way, in the oil that has flowed into the oil supply chamber 80, impurities that could not be separated may remain. In this case, even if impurities mixed in the oil flow toward the oil supply port 32, the rib 59 stops the impurities. Thereby, it is possible to prevent impurities from flowing into the supply tube 18 through the fuel filler port 32.

  4 corresponds to the “inlet”, the fuel filler port 32 corresponds to the “outlet”, the front wall 22 corresponds to the “first side wall”, and the back wall 25 corresponds to the “first side”. 2 "and the screw 48 corresponds to the" plug member ". Further, the first bottom wall 27a corresponds to the “second bottom wall”, the second bottom wall 27b corresponds to the “third bottom wall”, and the third bottom wall 27c corresponds to the “first bottom wall”. Equivalent to.

  Next, a method for discharging oil from the oil tank 9 will be described. For example, the oil stored in the oil tank 9 may be discharged at the time of shipment for a trial operation. Further, there is a case where the oil in the oil tank 9 is discharged in order to replace the old oil. In these cases, the oil in the oil tank 9 is discharged by the following method. First, the electronic sewing machine 1 shown in FIG. 8 is gradually tilted backward about the lower part of the sewing machine frame 5 of the bed 2. Then, as shown in FIG. 9, the oil tank 9 attached to the sewing machine frame 5 can be tilted.

  At this time, in the oil tank 9, the entire oil in the tank main body 21 moves to the back wall 25 side and accumulates inside a V-shaped space between the bottom wall 27 and the back wall 25 when viewed from the side. Become. Since the inclined surface of the second bottom wall 27b is gentle, by tilting the oil tank 9, impurities accumulated in the first bottom wall 27a shown in FIG. 4 are separated by the partition wall 50 into the second bottom wall 27b. It can be guided and moved on the third bottom wall 27c. Further, since the discharge port 38 is disposed on the return oil chamber 70 side of the third bottom wall 27 c, impurities can be moved to the discharge port 38. Furthermore, since the tip of the other end 51 of the partition wall 50 faces the discharge port 38, the impurities that have moved along the partition wall 50 are guided toward the discharge port 38 by the other end 51. Thereby, it is possible to prevent impurities from moving to the oil supply chamber 80 via the inflow passage 29.

  Next, the screw 48 attached to the discharge port 38 is loosened. Then, since a gap is formed between the inner surface of the discharge port 38 and the screw 48, only the oil can be easily discharged out of the tank body 21 through the gap. Furthermore, when all the oil is discharged from the tank main body 21, only impurities are accumulated in the upper part of the discharge port 38. Thereafter, by completely removing the screw 48 from the discharge port 38, only the impurities can be easily discharged out of the tank body 21.

  As described above, the oil tank 9 according to the present embodiment stores oil for lubricating the upper shaft metal of the electronic sewing machine 1 and the driving portion of the hook, and stores return oil recovered by the oil supply pump 8. To do. The oil tank 9 includes a tank body 21, and the tank body 21 is provided with a partition wall 50 that divides the tank body 21 into a return oil chamber 70 and an oil supply chamber 80. One end portion of the partition wall 50 is connected to the inner surface of the front wall 22, and the other end portion 51 opposite to the one end portion is disposed at a boundary portion between the second bottom wall 27b and the third bottom wall 27c. The return oil chamber 70 is bent. An inflow passage 29 for allowing the return oil in the return oil chamber 70 to flow into the oil supply chamber 80 is formed between the other end 51 of the partition wall 50 and the inner surface of the back wall 25. Further, a discharge port 38 for discharging oil and impurities in the tank body 21 is provided on the return oil chamber 70 side of the third bottom wall 27c.

  Then, the return oil discharged from the oil supply pump 8 flows into the return oil chamber 70 from the return port 31 of the tank body 21 through the return tube 19. On the other hand, the oil stored in the oil supply chamber 80 flows out of the tank body 21 from the oil supply port 32 and is sucked into the oil supply pump 8 through the supply tube 18. As a result, the oil in the return oil chamber 70 flows into the oil supply chamber 80 via the inflow passage 29, so that an oil flow from the return oil chamber 70 toward the oil supply chamber 80 is formed in the tank body 21. Thereby, the return oil that has flowed into the return oil chamber 70 flows toward the rear of the tank body 21.

  And since impurities (for example, chips, lint, etc.) mixed in the return oil sink due to their own weight, only the oil from which the impurities have been removed flows backward. Furthermore, since the second bottom wall 27b is inclined obliquely upward toward the rear, the impurities are less likely to flow backward. Therefore, impurities can be accumulated in the first bottom wall 27a. Furthermore, since the other end 51 of the partition wall 50 is bent toward the return oil chamber 70, an oil flow toward the left side wall 23 can be formed in the second bottom wall 27b. Thereby, the impurities on the second bottom wall 27b can be dropped onto the first bottom wall 27a. Furthermore, since the other end 51 of the partition wall 50 is disposed at the boundary portion between the second bottom wall 27b and the third bottom wall 27c, the oil flow toward the left side wall 23 is allowed to flow through the third bottom wall 27c. It can be formed in front. Thereby, even when the impurity moves to the upper part of the second bottom wall 27b, it can be dropped to the first bottom wall 27a by the flow of oil toward the left side wall 23 side.

  In this manner, the return oil in the return oil chamber 70 can be easily separated into oil and impurities while flowing through the first bottom wall 27a and the second bottom wall 27b. Then, only the separated oil can flow into the oil supply chamber 80 through the inflow passage 29. As a result, the return oil collected in the oil tank 9 can be repeatedly supplied to the rotary hook 7 for use.

  When discharging the oil from the oil tank 9, first, the oil tank 9 is tilted by tilting the electronic sewing machine 1. Thereby, the oil in the tank main body 21 can be moved to the back wall 25 side, and can be easily discharged from the discharge port 38. Similarly, impurities accumulated on the first bottom wall 27a can be moved onto the third bottom wall 27c by tilting the oil tank 9. And since the discharge port 38 is arrange | positioned at the return oil chamber 70 side of the 3rd bottom wall 27c, the impurity which moved on the 3rd bottom wall 27c can be discharged | emitted easily from the discharge port 38. FIG. Furthermore, since the tip of the other end 51 of the partition wall 50 faces the discharge port 38, impurities that have moved along the partition wall 50 can be guided to the discharge port 38. Thereby, it is possible to prevent impurities from moving to the oil supply chamber 80 via the inflow passage 29. Thus, all the impurities accumulated in the tank body 21 from the discharge port 38 can be easily discharged out of the tank body 21.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the above embodiment, the bottom wall 27 of the tank main body 21 is stepped from the front side to the rear side, but may be lowered from the front side to the rear side. And you may provide the discharge port which discharges oil and an impurity out of the tank main body 21 in the lowest part.

  For example, as in the modification shown in FIG. 10, the oil tank 90 has the same structure as the oil tank 9 of the above embodiment, and the bottom wall 127 of the tank body 121 faces from the front wall 122 side to the back wall 125 side. And stepped lower. The bottom wall 127 is disposed on the front wall 122 side and has a first bottom wall 127a having a horizontal plane, and a first horizontal wall disposed on the back wall 125 side and disposed in a position one step lower than the first bottom wall 127a. A third bottom wall 127c and a second bottom that is disposed between the first bottom wall 127a and the third bottom wall 127c, and is inclined obliquely downward from the first bottom wall 127a side toward the third bottom wall 127c side. And wall 127b. As in the above embodiment, the tank body 121 is partitioned by the partition wall 150 into a return oil chamber 170 and an oil supply chamber (not shown). Further, a cylindrical discharge port 138 extending downward is provided on the return oil chamber 170 side of the lowest bottom wall 127 of the third bottom wall 127c. A screw 48 is attached to the discharge port 138 via a packing 91.

  In such an oil tank 90, the return oil that has flowed into the return oil chamber 170 settles and accumulates on the first bottom wall 127a, and part of it falls on the second bottom wall 127b due to the flow of return oil. To move onto the third bottom wall 127c. When the oil in the oil tank 90 is discharged, the oil in the tank main body 121 can be discharged as it is by removing the screw 48 from the discharge port 138 without tilting the electronic sewing machine 1. Further, the impurities accumulated on the bottom wall 127 can move toward the third bottom wall 127c as the oil is discharged and can be discharged as it is from the discharge port 138. Oil can be discharged more efficiently.

1 is a perspective view of an electronic sewing machine 1. FIG. FIG. 4 is an explanatory diagram showing an oil circulation path in the oil tank 9 and the oil supply pump 8. 2 is a cross-sectional view of an oil supply pump 8. FIG. 2 is a perspective view of an oil tank 9. FIG. 2 is a front view of an oil tank 9. FIG. 2 is a plan view of an oil tank 9. FIG. It is AA arrow direction sectional drawing shown in FIG. 1 is a partially broken side view of an electronic sewing machine 1. FIG. 2 is a partially broken side view of the electronic sewing machine 1 when tilted. FIG. It is sectional drawing of the oil tank 90 which is a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic sewing machine 5 Sewing machine frame 9 Oil tank 21 Tank main body 22 Front wall 25 Back wall 27 Bottom wall 27a 1st bottom wall 27b 2nd bottom wall 27c 3rd bottom wall 29 Inflow path 31 Return port 32 Oil supply port 38 Outlet port 48 Screw 50 Partition wall 51 Other end 59 Rib 70 Return oil chamber 80 Oil supply chamber 90 Oil tank 121 Tank body 127a First bottom wall 127b Second bottom wall 127c Third bottom wall 138 Discharge port

Claims (7)

A rectangular parallelepiped tank body, an oil supply chamber standing on the inner surface of the bottom wall of the tank body and containing lubricating oil flowing out of the tank body, and a return oil chamber containing return oil from outside the tank body A partition wall for partitioning, an oil outlet provided on the oil supply chamber side of the tank main body, an outlet for allowing the lubricating oil in the oil supply chamber to flow out of the tank main body, and a return oil chamber side of the tank main body, An oil tank of a sewing machine that is attached to a sewing machine frame, and has an inflow port for allowing the return oil from outside the tank body to flow into the return oil chamber.
One end of the partition wall is connected to the inner surface of the first side wall of the tank body,
The other end portion of the partition wall opposite to the one end portion is disposed away from the inner surface of the second side wall facing the first side wall,
An inflow passage provided between the inner surface of the second side wall of the tank body and the other end of the partition wall, and for allowing the return oil in the return oil chamber to flow into the oil supply chamber;
Provided on the return oil chamber side of the bottom wall of the tank body, and a discharge port for discharging foreign matter mixed in the return oil to the outside of the tank body;
A sewing machine oil tank comprising a plug member for closing the discharge port.   The oil tank for a sewing machine according to claim 1, wherein the other end portion of the partition wall is bent toward the return oil chamber.   The oil tank for a sewing machine according to claim 1 or 2, wherein the first side wall side of the bottom wall is lower than the second side wall side. The bottom wall is
A first bottom wall disposed on the second side wall;
A second bottom wall disposed on the first side wall and lower than the first bottom wall;
A third bottom wall disposed between the first bottom wall and the second bottom wall and inclined from the second bottom wall side toward the first bottom wall side;
The oil tank for a sewing machine according to claim 2 or 3, wherein the other end of the partition wall is disposed at a boundary between the third bottom wall and the first bottom wall.   3. The oil tank for a sewing machine according to claim 1, wherein the second side wall side of the bottom wall is lower than the first side wall side.   6. The sewing machine oil tank according to claim 1, wherein the discharge port is provided on the second side wall side of the bottom wall. The outlet is provided at a lower portion of the first side wall on the oil supply chamber side,
7. The sewing machine oil tank according to claim 1, wherein a rib surrounding the outflow port is provided in the vicinity of the outflow port of the bottom wall.

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