JP2007296096A - Oil tank of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil tank of a sewing machine, which certainly provides technical advantages by preventing at least one of change in amount of lubricating oil supplied for a sliding part and spout of the lubricating oil through an air vent port at the time of leaning of the sewing machine body. <P>SOLUTION: A ceiling 2U of a tank body 2 has a projecting tectorium part 7 which contains an air reservoir chamber 7a which communicates with inner space 2a of the tank body 2, and the tectorium part 7 is equipped with a reflux opening 8. Furthermore, a spout prevention wall 12 is provided on the inner face of the ceiling 2U of the tank body 2 so that it can prevent the lubricating oil L stored in the tank body 2a from spouting out of the tank body 2 through an air vent port 10 when the machine body B is tilted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oil tank for a sewing machine suitable for storing lubricating oil supplied to a sliding portion of the sewing machine.

  Conventionally, in a sewing machine (mainly an industrial sewing machine), one part is movable, and there is a sliding part that requires lubricating oil supported so that the one part contacts the other part. Provided everywhere, an oil supply mechanism for supplying lubricating oil to such sliding parts is provided. As such an oil supply mechanism, an oil pan that stores lubricating oil is disposed below the sewing bed, and the lubricating oil stored in the oil pan is generally supplied to the sliding portion by a pump or an oil core. It is.

  For such a general sewing machine, the minimum necessary sliding part, for example, the sliding part between the hook shaft and the hook shaft bearing, for the purpose of preventing contamination of the sewing product by the lubricating oil, etc. A sewing machine that supplies lubricating oil only to a hook portion such as a contact portion between the inner hook and the outer hook has been proposed.In such a sewing machine, the inside of the sewing machine body, for example, below the sewing machine bed, An oil tank is disposed inside a pedestal that is erected on the sewing machine bed so as to connect the sewing machine bed and the sewing machine arm (see, for example, Patent Document 1).

  FIG. 9 shows a sewing machine equipped with a conventional oil tank. The conventional sewing machine M is constructed by attaching a sewing machine body B to a predetermined position on a sewing machine table (sewing machine table) T so as to be tilted. Yes. The sewing machine frame F of the sewing machine main body B includes a sewing machine bed FB, a sewing machine arm FA extending above the sewing machine bed FB in parallel with the sewing machine bed FB, and a sewing machine bed FB and a sewing machine arm FA. It is formed in a substantially U shape having a pedestal portion FP connected on the rear end side opposite to the sewing machine head as a side.

  In addition, an oil tank 101 for storing lubricating oil supplied to the sliding portion of the shuttle is attached to the inside of the sewing machine main body B, for example. The oil tank 101 is disposed, for example, below the sewing machine bed FB, and is tilted together with the sewing machine body B around the tilting center axis RL as shown by a two-dot chain line in FIG. It has become so. In addition, as an arrangement | positioning position of the oil tank 101, there also exists a structure arrange | positioned inside the connection trunk | drum FP.

  FIG. 11 to FIG. 13 show the structure of a main part of an example of a conventional oil tank 101. The conventional oil tank 101 has, for example, a tank body 102 formed in a hollow rectangular parallelepiped shape having a hollow inside. The inside is a storage space 102a for storing the lubricating oil L. In the lower part of the right side wall 102R of the tank main body 102, an oil supply port 103 for supplying the lubricating oil L is formed inside the tank main body 102. The oil supply port 103 has a right side wall 102R. A cylindrical oil supply nozzle 104 erected on the outer surface of the oil supply port is disposed so that the inner hole 104 a communicates with the oil supply port 103. One end of a flexible oil supply pipe is connected to the oil supply nozzle 104.

  A supply port 105 for supplying the lubricating oil L stored in the tank main body 102 to the sliding portion is formed in the lower portion of the left side wall 102L of the tank main body 102. A cylindrical supply nozzle 106 erected on the outer surface of the left side wall 102 </ b> L of 102 is disposed so that the inner hole 106 a communicates with the supply port 105. The supply nozzle 106 is connected to one end of a supply pipe having flexibility.

  A reflux port 107 for returning the lubricating oil L supplied to the sliding portion to the tank body 102 is formed in the upper portion of the left side wall 102L of the tank body 102. A cylindrical reflux nozzle 108 erected on the outer surface of the left side wall 102 </ b> L of 102 is disposed so that the inner hole 108 a communicates with the reflux port 107. The reflux nozzle 108 is connected to one end of a flexible reflux pipe.

  An air vent hole 109 communicating with the inside and outside of the tank body 102 is formed in the vicinity of the upper right corner of the top wall 102 U of the tank body 102 in FIG. 12, and the lubricating oil L is introduced into the tank body 102 through the oil supply port 103. When oil is supplied, the air existing inside the tank body 102 can be discharged to the outside of the tank body 102 as the oil level La, which is the liquid level of the lubricating oil L, rises. Further, when the oil level La of the lubricating oil L inside the tank main body 102 is lowered, air existing outside the tank main body 102 can be introduced into the tank main body 102. In other words, the air vent hole 109 can open the internal space 102a, which is the inside of the tank body 102, to the atmosphere.

  As shown in FIG. 14, the air vent hole 109 has a tilt center in a normal state where the sewing machine body B is not tilted so as to be positioned above the oil surface La of the lubricating oil L when the sewing machine body B is tilted. It is arranged far from the axis RL. This is because when the air vent hole 109 is disposed at a position close to the tilted central axis RL, the oil surface La of the lubricant oil L is located above the air vent hole 109 and the lubricant oil L may flow out of the air vent hole 109. This is because it becomes larger. Further, the tilt center axis RL is arranged with its longitudinal direction parallel to the longitudinal direction of the sewing machine bed FB (the left-right direction in FIG. 9), and the direction of the tank body 102 shown in the left-right direction in FIG. 11 and FIG. They are arranged in parallel.

  Note that reference numeral 102D in FIG. 11 of the tank body 10 is a bottom wall, reference numeral 102F in FIG. 12 is a front side wall, and reference numeral 102B in FIG. 12 is a rear side wall.

  The maximum amount of lubricating oil L stored in the tank body 102 is set so that the oil surface La of the lubricating oil L after the sewing machine body B is tilted is positioned below the air vent hole 109. Yes.

  According to the oil tank 101 having such a configuration, the lubricating oil L is supplied to the inside of the tank body 102 through the oil supply port 103, and the supplied lubricating oil L in the tank body 102 is supplied to the supply port 105. It is supplied to a sliding part such as a hook part. Then, the excess lubricating oil L supplied to the sliding part is returned to the inside of the tank main body 102 through the reflux port 107. Further, the inside of the tank body 102 is opened to the atmosphere by the air vent hole 109 formed in the top wall 102U of the tank body 102 and communicating with the inside and outside of the tank body 102. On the other hand, no pressure is applied. As a result, the lubricating oil L can easily flow into the tank body 102 from the oil supply port 103 and the reflux port 107.

Japanese Patent Laid-Open No. 2003-164589

  However, the conventional oil tank 101 of the sewing machine M has a problem that it cannot meet the recent demand for higher performance.

  For example, the amount of the lubricating oil L stored in the tank main body 102 may be supplied exceeding a preset maximum oil amount. In this case, the oil surface La of the lubricating oil L is positioned above the recirculation port 107, and the recirculation port 108 is blocked by the lubricating oil L stored in the tank body 102. As a result, when the oil level La of the lubricating oil L stored in the tank body 102 is located above the recirculation port 107 and when the oil surface La of the lubricating oil L is located below the recirculation port 107. There is a problem in that the flow resistance of the lubricating oil L returning to the tank body 102 changes, and the supply amount of the lubricating oil L to the sliding portion changes.

  Further, in the conventional oil tank 101 of the sewing machine, when the sewing machine main body B is tilted due to maintenance or the like, the lubricating oil is caused by the flow of the lubricating oil L stored in the tank main body 102 due to the momentum when the sewing machine main body B is tilted. The oil surface La of L vibrates and a wave is generated, and the top of the wave comes into contact with the top wall 102U of the tank body 102, and a part of the contacted lubricating oil L is on the top wall 102U of the tank body 2. There was a problem that the air flowed down on the inner surface and flowed downward in the tilting direction to reach the air vent hole 109 and ejected from the air vent hole 109 to the outside.

  Accordingly, it is possible to reliably achieve high performance by preventing at least one of a change in the amount of lubricating oil supplied to the sliding portion and an ejection of the lubricating oil from the air vent hole when the sewing machine body tilts. Sewing machine oil tanks are needed.

  The present invention has been made in view of this point, and prevents at least one of a change in the amount of lubricating oil supplied to the sliding portion and a jet of lubricating oil from the air vent hole when the sewing machine body tilts. It is an object of the present invention to provide an oil tank for a sewing machine that can surely achieve high performance.

  In order to achieve the above-described object, the oil tank of the sewing machine according to the present invention is characterized in that a tank main body for storing lubricating oil, an oil supply port for supplying lubricating oil into the tank main body, and the tank A sewing machine provided with a supply port for supplying lubricating oil stored inside the main body to the sliding portion and a return port for returning the lubricating oil supplied to the sliding portion to the tank main body. In the oil tank, the top wall of the tank main body is provided with a canopy portion that includes an air reservoir chamber communicating with the internal space of the tank main body, and the reflux port is provided on the canopy portion. It is in the point provided. By adopting such a configuration, the air reservoir chamber is closed at the reflux port by the lubricating oil stored in the tank body regardless of the amount of lubricating oil stored in the tank body. Since peeling can be prevented, the flow resistance of the lubricating oil returning to the tank body can be made constant. As a result, the amount of lubricating oil supplied to the sliding portion can be made constant.

  Another oil tank characteristic of the sewing machine according to the present invention is arranged inside the sewing machine main body attached to the sewing machine table so as to be tiltable, and the tank main body for storing lubricating oil is lubricated inside the tank main body. An oil supply port for supplying oil, a supply port for supplying the lubricating oil stored in the tank body to the sliding part, and the lubricating oil supplied to the sliding part are returned to the tank body. And an air vent hole for opening the inside of the tank body to the atmosphere on the top wall of the tank body. A jetting prevention wall for preventing the lubricating oil stored inside the tank body from being jetted out of the air vent hole to the outside of the tank body when tilted is provided on the top wall of the tank body. In that it provided on a surface. By adopting such a configuration, when the sewing machine body is tilted, the jetting prevention wall causes the lubricating oil that tries to reach the air vent hole along the inner surface of the top wall of the tank body to be in front of the air vent hole. Therefore, it is possible to prevent the lubricating oil from being ejected from the air vent hole when the sewing machine body is tilted.

  In the oil tank of the other sewing machine according to the present invention, the top wall of the tank body is provided so that a canopy portion that includes an air reservoir chamber that communicates with the internal space of the tank body is projected. It is preferable that the reflux port is provided in the canopy portion. By adopting such a configuration, the air reservoir chamber is closed at the reflux port by the lubricating oil stored in the tank body regardless of the amount of lubricating oil stored in the tank body. Since peeling can be prevented, the flow resistance of the lubricating oil returning to the tank body can be made constant. As a result, the amount of lubricating oil supplied to the sliding portion can be made constant. In addition, the jetting prevention wall can prevent the lubricating oil that tries to reach the air vent hole along the inner surface of the top wall of the tank main body before the air vent hole when the sewing machine body is tilted. It is possible to prevent the lubricating oil from being ejected from the air vent hole when tilting.

  According to the oil tank of the sewing machine according to the present invention, by providing the air reservoir, the oil is recirculated by the lubricating oil stored in the tank body regardless of the amount of the lubricating oil stored in the tank body. Since the mouth can be prevented from being blocked, the flow resistance of the lubricating oil returning to the tank body can be made constant. As a result, the amount of lubricating oil supplied to the sliding portion can be made constant. In addition, by providing a blow-off prevention wall, when the sewing machine body is tilted, it is possible to prevent the lubricating oil that tries to reach the air vent hole through the inner surface of the top wall of the tank body before the air vent hole. Further, it is possible to prevent the lubricating oil from being ejected from the air vent hole when the sewing machine body is tilted.

  Therefore, according to the oil tank of the sewing machine according to the present invention, it is possible to prevent at least one of a change in the supply amount of the lubricating oil to the sliding portion or a jet of the lubricating oil from the air vent hole when the sewing machine is tilted. There is an extremely excellent effect such as that it is possible to surely achieve high performance.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 to 3 show a first embodiment of an oil tank for a sewing machine according to the present invention. FIG. 1 is a schematic sectional view of an essential part, FIG. 2 is a plan view of FIG. 1, and FIG. 1 is a left side view of FIG.

  The structure of the sewing machine in which the oil tank of the sewing machine according to the present embodiment is disposed is the same as that of the conventional sewing machine (see FIGS. 9 and 10) described above, and detailed description thereof is omitted. Only will be described.

  As shown in FIGS. 1 to 3, an oil tank (hereinafter simply referred to as an oil tank) 1 of a sewing machine according to the present embodiment has a tank body 2 having an interior formed in a horizontally long rectangular parallelepiped shape. Yes. The internal space of the tank body 2 is a storage space 2a for storing the lubricating oil L. Further, the tank body 2 has a right side wall 2R shown on the right side of FIG. 1, a left side wall 2L shown on the left side of FIG. 1, and one end side of the right side wall 2R and the left side wall 2L shown on the lower side of FIG. 1), a rear side wall 2B connecting the other side of the right side wall 2R and the left side wall 2L shown in the upper part of FIG. 2 (upper part of FIG. 2), and a bottom wall shown in the lower part of FIG. 2D and the top wall 2U shown in the upper part of FIG. 1 are mainly configured.

  The shape of the tank body 2 may be set as required according to the shape of the sewing machine body (reference numeral B in FIGS. 9 and 10), the design concept, etc. In particular, the interior of the present embodiment is a horizontally long rectangular parallelepiped shape. It is not limited to. For example, when the oil tank 1 is arranged below the sewing machine bed (reference FB in FIGS. 9 and 10), the cross section may be concave so that the lower shaft is straddled from below when viewed from the sewing machine head side. Of course, it is important to have a shape that does not interfere with other parts disposed inside the sewing machine body.

  An oil supply port 3 for supplying lubricating oil L to the inside of the tank body 2 is formed in the lower portion of the right side wall 2R of the tank body 2, and the right side wall 2R of the tank body 2 is formed in the oil supply port 3. A cylindrical oil supply nozzle 4 erected on the outer surface of the oil supply port 4 is disposed so that the inner hole 4 a communicates with the oil supply port 3. In addition, the oil supply port 3 of this embodiment and the inner hole 4a of the oil supply nozzle 4 are formed in the same size. One end of a flexible oil supply pipe is connected to the oil supply nozzle 4.

  A supply port 5 for supplying the lubricating oil L stored in the tank main body 2 to the sliding portion is formed in the lower portion of the left side wall 2L of the tank main body 2. A cylindrical supply nozzle 6 erected on the outer surface of the left side wall 2 </ b> L is disposed so that the inner hole 6 a communicates with the supply port 5. Note that the supply port 5 and the inner hole 6a of the supply nozzle 6 of the present embodiment are formed in the same size. The supply nozzle 6 is connected to one end of a supply pipe having flexibility.

  An upper surface of the tank body 2, specifically, a lower left corner portion of the top wall 2 </ b> U in FIG. 2, is integrally provided so that a canopy portion 7 formed in a case shape with an opening at the bottom projects upward. The internal space of the canopy portion 7 is in communication with a storage space 2 a that is an internal space of the tank body 2, and the internal space of the canopy portion 7 is disposed above the top wall 2 U of the tank body 2 so as to store air. It is a chamber 7a.

  In the left side wall 7L of the canopy 7 shown on the left side in FIG. 1, a reflux port 8 for returning the lubricating oil L supplied to the sliding portion to the tank body 2 is formed so as to communicate with the air reservoir 7a. Has been. That is, the reflux port 8 is disposed below the ceiling of the air reservoir 7a. A cylindrical reflux nozzle 9 erected on the outer surface of the left side wall 7L of the canopy 7 is disposed in the reflux port 8 so that the inner hole 9a communicates with the reflux port 8. Furthermore, one end of a flexible reflux pipe is connected to the reflux nozzle 9. In this embodiment, the reflux port 8 and the inner hole 9a of the reflux nozzle 9 are formed in the same size.

  The shape of the canopy portion 7 can be selected from various shapes such as a bottomed cylindrical shape and a bottomed rectangular tube shape as required according to the design concept. In addition, the position where the canopy 7 is disposed can be selected from any position on the outer surface of the top wall 2U according to the design concept or the like as long as it does not interfere with the formation position of the air vent hole 10 described later. it can. Of course, the canopy 7 may be provided on the side surface of the tank body 2. In this case, it is important to arrange the height position of the ceiling of the canopy 7 above the top wall 2U of the tank body 2. In addition, it is important that the sewing machine main body is provided so as not to interfere with other parts arranged inside the sewing machine body.

  The position where the reflux port 8 is formed is not limited to the left side wall 7L of the canopy unit 7, but can be provided at any position of the canopy unit 7, but is preferably provided as close as possible to the ceiling of the air reservoir 7a. . Of course, it can also be provided on the upper surface of the canopy 7.

  In the vicinity of the upper right corner in FIG. 2 of the top wall 2U of the tank body 2, air existing inside the tank body 2 is discharged to the outside of the tank body 2 or air existing outside the tank body 2 is discharged from the tank body 2 An air vent hole 10 for introduction into the interior of 2 is formed. As shown in FIG. 4, the air vent hole 10 is positioned above the oil surface La of the lubricating oil L in a state where the sewing machine body is tilted. Located far away.

  The tilting central axis RL is arranged with its longitudinal direction parallel to the longitudinal direction (left and right direction of FIG. 9) of the sewing machine bed (reference numeral FB of FIG. 9). It is arranged in parallel with the direction shown in the left-right direction. Moreover, as shown by a two-dot chain line in FIG. 1, a cylindrical body 11 surrounding the air vent hole 10 may be provided on the outer surface of the top wall 2U.

  Inside the tank body 2, there is an ejection blocking wall 12 for preventing the lubricating oil L stored inside the tank body 2 from being ejected from the air vent hole 10 when the sewing machine body is tilted. Is formed.

  The ejection preventing wall 12 of the present embodiment is formed in a flat plate shape that extends vertically toward the bottom wall 2D on the inner surface of the top wall 2U, the right end is connected to the right side wall 2R, and the left end is the left side wall 2L. It is connected to the. Further, the ejection preventing wall 12 is disposed between the air vent hole 10 which is farther (outside) than the tilted central axis RL from the air vent hole 10 and the rear side wall 2B shown in the upper part of FIG. That is, the ejection preventing wall 12 of the present embodiment is formed in parallel to the tilt center axis RL farther from the tilt center axis RL of the sewing machine body of the air vent hole 10. Further, the lower end of the ejection preventing wall 12 is disposed above the bottom surface which is the upper surface (inner surface) of the bottom wall 2 </ b> D of the tank body 2. What is necessary is just to set the position of the lower end of this ejection prevention wall 12 as needed, such as a design concept.

  The ejection blocking wall 12 may have a short length in the left-right direction in FIG. 1, may have a cylindrical shape surrounding the air vent hole 10, or may be around the air vent hole 10. Various shapes such as a planar semicircular shape, a planar triangular shape, and a planar semielliptical shape surrounding at least the tilted central axis RL from the air vent hole 10 may be used. That is, as the ejection preventing wall 12, when the sewing machine main body is tilted, the lubricating oil L that has been supplied to the storage space 2 a inside the tank main body 2 and stored therein is stored in a part of the inner wall of the tank main body 2. Any material can be used as long as it can prevent the air from being blown out through the air vent hole 10 through the inner surface of the ceiling wall 2U. Moreover, as the ejection prevention wall 12, you may have many holes penetrated in the thickness direction.

  An example of the ejection blocking wall 12A having a short length in the left-right direction is shown in FIG. Moreover, an example of the cylindrical ejection prevention wall 12B surrounding the circumference of the air vent hole 10 is shown in FIG.

  The oil tank 1 of the present embodiment is integrally molded with a resin such as polypropylene.

  Since other configurations are the same as those of the conventional oil tank, detailed description thereof is omitted.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  According to the oil tank 1 of the present embodiment, the lubricating oil L is supplied to the storage space 2a inside the tank main body 2 through the oil supply port 3 and the lubricating oil inside the supplied tank main body 2 is supplied as in the conventional case. L is supplied to the sliding part via the supply port 5, and the excess lubricating oil L supplied to the sliding part is returned to the storage space 2 a inside the tank body 2 via the reflux port 8.

  Further, according to the oil tank 1 of the present embodiment, when the lubricating oil L flows into the storage space 2a inside the tank body 2 via the oil supply port 3 and / or the reflux port 8, the top wall 2U of the tank body 2 Since the inside of the tank body 2 is opened to the atmosphere by the air vent hole 10 communicating with the inside and outside of the tank body 2 formed in the above, no pressure is applied to the lubricating oil L inside the tank body 2.

  That is, when lubricating oil L is supplied to the storage space 2 a inside the tank body 2 through the oil filler port 3, as the oil level La, which is the oil level of the lubricating oil L, rises, The existing air can be discharged to the outside of the tank body 2. Further, when the oil level La of the lubricating oil L stored in the storage space 2a inside the tank main body 2 is lowered, the air existing outside the tank main body 2 as the oil level La of the lubricating oil L is lowered. Can be introduced into the tank body 2. As a result, the lubricating oil L can easily flow from the oil supply port 3 and / or the reflux port 8 into the storage space 2 a inside the tank body 2.

  Furthermore, according to the oil tank 1 of the present embodiment, the canopy portion 7 having the air reservoir chamber 7a communicating with the storage space 2a inside the tank body 2 is protruded from the top wall 2U of the tank body 2 so as to protrude. Since the reflux port 8 is provided in the left side wall 7L of the canopy portion 7, air always exists in the air reservoir 7a. That is, even if the lubricating oil L is fully filled in the storage space 2a of the tank body 2 and the position of the oil surface La becomes the same height as the inner surface of the top wall 2U of the tank body 2, the air reservoir chamber 7a Since it is independently located above the oil level La, the air present in the air reservoir 7a is not discharged outside from the air vent hole 10 but is compressed in a negligible amount so as to be ignored. It stays inside the reservoir 7a.

  Therefore, according to the oil tank 1 of the present embodiment, unlike the prior art, the oil surface La of the lubricating oil L is located below the recirculation port 8, and the lubrication stored in the storage space 2a inside the tank body 2 is achieved. The reflux port 108 is not blocked by the oil L. That is, regardless of the amount of the lubricating oil L stored in the storage space 2a, the recirculation port 8 is always communicated with the air reservoir 7a where air is present.

  Therefore, according to the oil tank 1 of the present embodiment, the flow resistance of the lubricating oil L flowing back to the tank main body 2 does not change, and the sliding is performed regardless of the amount of the lubricating oil L stored in the storage space 2a. The supply amount of the lubricating oil L to the moving part can be kept constant.

  Further, according to the oil tank 1 of the present embodiment, when the sewing machine main body is tilted, the lubricating oil L stored in the storage space 2 a inside the tank main body 2 is ejected from the air vent hole 10 to the outside of the tank main body 2. Since the blowout prevention wall 12 for preventing this is provided on the inner surface of the top wall 2U of the tank body 2, when the sewing machine body is tilted for maintenance or the like, the inside of the tank body 2 is tilted. The oil surface La of the lubricating oil L vibrates due to the flow of the lubricating oil L stored in the tank, and a wave is generated. The top of the wave comes into contact with the top wall 2U of the tank body 2, and the contacting lubricating oil L It is possible to reliably and easily prevent the jet blocking wall 12 from partially passing through the inner surface of the top wall 2U of the tank body 2 and flowing downward in the tilting direction to reach the air vent hole 10. At this time, the lubricating oil L that has come into contact with the ejection preventing wall 12 travels along the ejection preventing wall 12 and flows down from the lower end of the ejection preventing wall 12 toward the oil surface La.

  Therefore, according to the oil tank 1 of the present embodiment, the lubricating oil L can be prevented from being ejected from the air vent hole 10 to the outside even when the sewing machine main body is tilted vigorously.

  Therefore, according to the oil tank 1 of the present embodiment, the supply amount of the lubricating oil L to the sliding portion is changed and / or the lubricating oil L is surely ejected from the air vent hole 10 when the sewing machine body is tilted. In addition, it is possible to reliably achieve high performance by easily preventing it.

  Further, according to the oil tank 1 of the present embodiment, as shown in FIG. 4, the ejection preventing wall 12 formed in parallel to the tilt center axis RL is provided far from the tilt center axis RL of the sewing machine body of the air vent hole 10. Therefore, it is possible to more reliably and easily prevent the lubricating oil L from flowing down the inner surface of the ceiling wall U in the tilting direction and reaching the air vent hole 10.

  Furthermore, as shown in FIG. 6, in the case where the blowout prevention wall 12B formed so as to surround the periphery of the air vent hole 10 is provided, the lubricating oil L is transmitted along the inner surface of the top wall U from all directions. Thus, it is possible to more reliably and easily prevent the air from reaching the air vent hole 10.

  7 and 8 show a second embodiment of the oil tank according to the present invention. FIG. 7 is a sectional view and FIG. 8 is a plan view.

  The oil tank 1 </ b> A of the present embodiment is configured to increase the storage amount of the lubricating oil L by disposing the height position of the air vent hole 10 above the height position of the reflux port 8.

  That is, as shown in FIGS. 7 and 8, the oil tank 1A of the present embodiment has an upper surface of the tank body 2, specifically, a portion of the top wall 2U where the canopy 7 is not formed, for example, FIG. 8, the canopy 7 is provided at the lower left corner of the upper surface of the tank body 2 in FIG. 8, so that the lower portion of the right side of FIG. Is integrally provided so that the increasing lid portion 21 formed in the shape of a case with an opening protrudes upward. The internal space of the increase canopy portion 21 is an increase storage space 21 a for the lubricating oil L, and communicates with a storage space 2 a that is an internal space of the tank body 2. And the air vent hole 10 is formed in the top wall 21U of the increasing amount canopy part 21, and the ejection prevention wall 22 is provided in the inner surface of the top wall 21U of the increasing amount canopy part 21. As shown in FIG.

  As described above, the air reservoir 7a and the increase storage space 21a communicating with the internal space of the tank body 2 are provided above the top wall 2U of the tank body 2. A reflux port 8 is connected to the air reservoir 7a. The reflux port 8 is connected to a sliding portion such as a hook portion that requires supply of the lubricating oil L by a connecting member such as a tube (not shown). For this reason, the air reservoir chamber 7a is a closed system that is not directly opened to the atmosphere due to the reason that the path by the connecting member is relatively long or the lubricating oil L is present in the normal sliding portion. It has become. When the liquid level La rises from the top wall 2U, air is trapped in the air reservoir 7a.

  On the other hand, the increase storage space 21a has an air vent hole 10 formed on the upper surface thereof. For this reason, when the liquid level La of the lubricating oil L rises from the top wall 2U, the lubricating oil L is mainly filled in the increasing storage space 21a.

  The ejection blocking wall 22 of the present embodiment is formed in a flat plate shape extending vertically toward the bottom wall 2D of the tank body 2 on the inner surface of the top wall 21U, and the right end is the right side wall of the increasing canopy portion 21. The left end is connected to the left side wall 21L of the increase canopy portion 21. Further, the ejection blocking wall 22 is disposed between the air vent hole 10 which is farther (outside) of the tilting central axis RL than the air vent hole 10 and the rear side wall 21B of the increasing canopy portion 21 shown in the upper part of FIG. . That is, the ejection preventing wall 22 of the present embodiment is formed in parallel with the tilting central axis RL farther from the tilting central axis RL of the sewing machine body of the air vent hole 10. Further, as shown in FIG. 7, the lower end of the ejection preventing wall 12 is disposed at a substantially intermediate position in the height direction shown in the vertical direction of FIG.

  Note that the shape of the increasing lid portion 21 of the present embodiment is an example, and various shapes can be used according to the design concept and the like. Of course, it is important that the sewing machine main body is provided so as not to interfere with other parts arranged inside the sewing machine main body.

  Since other configurations are the same as those of the oil tank 1 of the first embodiment described above, the same or corresponding components as those of the oil tank 1 of the first embodiment described above are denoted by the same reference numerals in the drawings. Detailed description thereof will be omitted.

  According to the oil tank 1A of the present embodiment having such a configuration, the same effect as that of the oil tank 1 of the first embodiment described above can be achieved, and as shown in FIG. Since the lubricating oil L can be stored also in the increasing storage space 21a, the amount of stored lubricating oil L can be increased. As a result, since the frequency of maintenance for supplying the lubricating oil L can be reduced, usability can be improved.

  Further, according to the oil tank 1A of the present embodiment, the air reservoir chamber 7a, the increase reservoir space 21a, which are provided above the top wall 2U of the tank body 2 and communicate with the internal space of the tank body 2, and the air reservoir chamber 7a, a reflux port connected to the sliding portion of the sewing machine by a connecting member such as a tube, and an air vent hole 10 formed in the increase storage space 21a, and the liquid level La of the lubricating oil L is the top wall When rising from 2U, the lubricating oil L is filled in the increasing storage space 21a. The upper surface of the increase storage space 21a is more preferably located above the upper surface of the air reservoir 7a.

  In addition, when the sewing machine main body is tilted, the ejection preventing wall 22 of the present embodiment causes the oil surface La of the lubricating oil L to flow due to the flow of the lubricating oil L stored inside the tank main body 2 when tilted. A wave is generated by vibration, and the top of the wave comes into contact with the top wall 21U of the increasing canopy portion 21, and a part of the contacted lubricating oil L is transmitted along the inner surface of the top wall 21U of the increasing canopy portion 21. Thus, it is possible to reliably and easily prevent the air from flowing downward in the tilting direction and reaching the air vent hole 10. At this time, the lubricating oil L that has come into contact with the ejection preventing wall 22 travels along the ejection preventing wall 22 and flows down from the lower end of the ejection preventing wall 22 toward the oil surface La.

  Further, the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

Typical sectional drawing which shows the principal part of 1st Embodiment of the oil tank of the sewing machine which concerns on this invention. Plan view of FIG. Left side view of FIG. 1 is a cross-sectional view taken along line AA in FIG. 1 so as to include an air vent hole in a state where the sewing machine body of the oil tank in FIG. 1 is tilted. Partial expanded sectional view which shows the modification of the ejection prevention wall of FIG. The partial expanded sectional view which shows the other modification of the ejection prevention wall of FIG. The same figure as FIG. 1 which shows the principal part of 2nd Embodiment of the oil tank of the sewing machine which concerns on this invention. Plan view of FIG. Typical front view which shows the principal part of the sewing machine provided with the conventional oil tank. Left side view of FIG. Typical sectional drawing which shows the principal part of the oil tank of the conventional sewing machine Plan view of FIG. Left sectional view of FIG. FIG. 11 is a cross-sectional view taken along line BB in FIG. 11 so as to include an air vent hole in a state where the sewing machine body of the oil tank in FIG. 11 is tilted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A Oil tank 2 Tank main body 2a Storage space 3 Oil supply port 5 Supply port 7 Canopy part 7a Air reservoir chamber 8 Recirculation port 10 Air vent hole 12, 12A, 12B, 22 Blowing prevention wall 21 Increase cover part 21a Increase storage space M sewing machine B sewing machine body F sewing machine frame FB sewing machine bed FP pedestal part L lubricating oil La liquid level RL tilting central axis

Claims (3)

A tank body for storing lubricating oil, an oil supply port for supplying lubricating oil into the tank body, and a supply port for supplying the lubricating oil stored in the tank body to the sliding portion And an oil tank of the sewing machine provided with a reflux port for returning the lubricating oil supplied to the sliding portion to the tank body,
The top wall of the tank body is provided so that a canopy part protruding inside has an air reservoir chamber communicating with the internal space of the tank body,
A sewing machine oil tank, wherein the reflux port is provided in the canopy. The tank body is disposed inside the sewing machine body so as to be tiltable, and the tank body for storing the lubricating oil has an oil supply port for supplying the lubricating oil into the tank body, and the tank body. The tank is provided with a supply port for supplying the lubricating oil stored therein to the sliding portion, and a reflux port for returning the lubricating oil supplied to the sliding portion to the tank body. In the oil tank of the sewing machine in which the air vent hole for opening the inside of the tank main body to the atmosphere is formed on the top wall of the main body,
When the sewing machine body is tilted, a jetting prevention wall for preventing the lubricating oil stored in the tank body from jetting out of the air vent hole to the outside of the tank body is a ceiling wall of the tank body. The oil tank of the sewing machine is provided on the inner surface of the sewing machine. The top wall of the tank body is provided so that a canopy part protruding inside has an air reservoir chamber communicating with the internal space of the tank body,
The sewing machine oil tank according to claim 2, wherein the reflux port is provided in the canopy.

Images