JP2012135419A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of receiving a lubricant oil attached to a knee advance lever and dropped downward by an oil tank, and the oil tank of the sewing machine.SOLUTION: An oil tank 10 has a cylindrical hole 601, into which a lever member 98 for driving a holding vertical movement mechanism is inserted, provided on a boss-shaped cylindrical part 60 erected upward from a base part 112 on an upper side of a recess 1213. The lever member 98 fixes a coating member 981 for coating the cylindrical part 60 provided with the cylindrical hole 601 from above. A sewing machine can prevent a lubricant oil attached to the lever member 98 in a post part and dropped along the lever member 98 from leaking to the outside through the cylindrical hole 601.

Description

  The present invention relates to a sewing machine including an oil tank that is fixed to a sewing machine body and that contains lubricating oil.

  Conventionally, a sewing machine has an oil tank. The oil tank stores lubricating oil to be supplied to each drive mechanism that drives the sewing machine. The oil tank is fixed to the sewing machine body.

  The sewing machine disclosed in Patent Document 1 can switch between a standing position and a tilted position tilted from the standing position. The oil tank of the sewing machine includes an oil receiver that can store lubricating oil, and an oil reservoir that can store all the lubricating oil stored in the oil receiver when the sewing machine is switched from the standing position to the tilted position. ing. The oil tank is provided below the bed portion. The oil tank can prevent the lubricating oil from leaking from the oil tank when the sewing machine is switched from the standing position to the tilted position.

Japanese Patent No. 4135136

  The conventional sewing machine includes a presser foot that moves up and down in conjunction with a knee-lifting lever or the like provided below the sewing machine body. The presser foot holds the work cloth. The presser foot is moved up and down by a presser foot vertical movement mechanism. The sewing machine includes a knee-lifting mechanism that connects a knee-lifting lever and a presser foot vertical movement mechanism in the main body. The lubricating oil supplied to each drive mechanism of the sewing machine may adhere to the knee raising mechanism and hang down. The oil tank of the sewing machine described in Patent Document 1 has a problem that the oil receiving portion cannot receive the lubricating oil that adheres to the knee-raising mechanism and hangs downward.

  An object of the present invention is to provide a sewing machine that can receive, by an oil tank, lubricating oil that adheres to a knee-lifting mechanism and hangs downward.

  In order to achieve the above object, a sewing machine according to a first aspect of the present invention includes a presser foot mechanism that presses a work cloth, a presser vertical motion mechanism that moves the presser foot mechanism up and down, and a lever member that extends in the vertical direction. In a sewing machine provided with a knee lifting mechanism for driving the presser vertical movement mechanism, an oil tank capable of storing lubricating oil, a through hole provided in the oil tank and capable of penetrating the lever member of the knee lifting mechanism, And a cover member provided on the knee raising mechanism and covering the through hole.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the oil tank forms a protrusion in the vertical direction, and the through hole is parallel to the protrusion in the protrusion. The cover member includes a first cover that covers the through hole, and a second cover that covers the entire side surface of the protruding portion along the protruding direction of the protruding portion.

  A sewing machine according to a third aspect of the present invention is the sewing machine according to the first or second aspect, wherein the oil tank includes an outer peripheral wall that forms an opening that opens upward, a bottom wall, and the outer peripheral wall. An opposing wall formed on the inner side, provided between the opening and the bottom wall and at a position spaced from the bottom wall, which is a wall facing the bottom wall; and the opening side of the opposing wall And a hole portion that communicates with the bottom wall side, and the outer peripheral wall and the opposing wall form an oil receiving portion that receives lubricating oil falling from the opening, the outer peripheral wall, the opposing wall, and the An oil storage portion for collecting the lubricating oil received by the oil receiving portion from the hole portion with the bottom wall is formed.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the invention, a part of the outer peripheral wall of the oil accommodating portion is recessed toward the opposing outer peripheral wall, and the bottom wall of the opposing wall A concave portion that exposes the side and an upper wall of the concave portion that is exposed from the concave portion among the opposing walls of the oil receiving portion are further provided, and the protruding portion is provided on the upper wall of the concave portion.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect of the invention, the protruding portion protrudes from the upper wall of the concave portion to the opening portion, and the second cover is above the concave portion of the protruding portion. Covering from the wall to the protruding end of the protruding portion.

  In the sewing machine according to the first aspect, the oil tank has a through-hole through which the lever member of the knee-lifting mechanism that has a lever member extending in the vertical direction and drives the presser moving mechanism can be passed. The knee raising mechanism fixes a cover member that covers the through hole. Therefore, the sewing machine can prevent the lubricating oil that lubricates each mechanism of the sewing machine by the cover member from leaking from the through hole to the outside of the oil tank through the knee lifting mechanism.

  In the sewing machine according to claim 2, in addition to the effect of the invention according to claim 1, the oil tank is provided with a protruding portion in the vertical direction. The through hole is formed at a position where the protruding portion protrudes in parallel with the protruding direction. In the cover member, the second cover covers the entire side surface of the protrusion. Therefore, the sewing machine can reliably prevent the lubricating oil inside the oil tank from leaking outside through the through-hole even when the knee-raising mechanism is driven.

  In the sewing machine according to claim 3, in addition to the effects of the invention according to claim 1 or 2, the oil tank is lubricated for lubricating the mechanism of the sewing machine in an oil storage portion formed by the outer peripheral wall, the opposing wall and the bottom wall. Oil can be stored. Lubricating oil that is used for lubrication and falls from the inside of the sewing machine is received by an oil receiving portion that is formed by an opening between the outer peripheral wall and the opposing wall. The lubricating oil received by the oil receiving part passes through the hole and accumulates in the oil containing part. When the sewing machine vibrates, the lubricating oil does not leak from the opening to the outside by the facing wall. Therefore, the sewing machine can prevent the lubricating oil from leaking outside the oil tank.

  In the sewing machine according to claim 4, in addition to the effect of the invention according to claim 3, in the oil tank, a part of the outer peripheral wall of the oil storage portion is recessed in the opposing outer peripheral wall side, and the bottom wall side of the opposing wall is exposed. A recess is provided. The opposing wall of the oil receiving portion includes a concave upper wall exposed from the concave portion. The knee raising mechanism that passes through the through hole of the protruding portion passes through the concave portion below the upper wall of the concave portion. Therefore, the knee raising mechanism does not pass through the inside of the oil storage portion. Therefore, the sewing machine can more reliably prevent the lubricating oil contained in the oil tank from leaking outside through the knee lifting mechanism.

  In the sewing machine of claim 5, in addition to the effect of the invention of claim 4, the protrusion protrudes from the upper wall of the recess to the opening, and the second cover extends from the upper wall of the protrusion to the protruding end of the protrusion. It extends. Therefore, when the knee-raising mechanism is driven, the range in which the cover member covers the protruding portion is increased, and the sewing machine can more reliably prevent the lubricating oil contained in the oil tank from leaking outside through the through hole. .

1 is a front view of a sewing machine 1. FIG. 1 is a longitudinal sectional view of a sewing machine 1. FIG. FIG. 2 is a perspective view showing a drive mechanism inside the sewing machine 1. It is the figure which looked at the inside of the bed part 21 of the sewing machine 1 from the downward direction. 1 is a perspective view showing an external appearance of an oil tank 10. FIG. 1 is a perspective view showing an external appearance of an oil tank 10. FIG. 2 is a plan view of the oil tank 10. FIG. FIG. 8 is a cross-sectional view taken along the line II-II in FIG. 7. It is an arrow directional cross-sectional view in the III-III line of FIG. It is arrow direction sectional drawing in the II line | wire of FIG. FIG. 6 is a perspective view showing a tension release mechanism 63 and a presser vertical movement mechanism 64. 2 is a front sectional view showing an oil tank 10 and a lever member 98. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the front side and the back side in FIG. 1 are the front side and the rear side of the sewing machine 1, respectively.

  The overall structure of the sewing machine 1 will be described with reference to FIGS. As shown in FIG. 1, the sewing machine 1 includes a bed portion 21, a pedestal column portion 22, and an arm portion 23. The bed portion 21 is provided on a table (not shown). The pedestal portion 22 extends upward from the right end of the bed portion 21. The arm portion 23 extends leftward from the upper end of the pedestal column portion 22. The arm part 23 faces the bed part 21.

  The bed portion 21 includes an oil tank 10, a lower rotary shaft 36, a bearing portion 51, a full rotary hook 46, and the like. The oil tank 10 contains lubricating oil. The oil tank 10 is provided below the pedestal 22. Details of the lower rotary shaft 36 and the bearing portion 51 will be described later.

  The arm portion 23 is provided with a presser foot 48 and a sewing needle 42 below the left end. A presser bar 44, a spring 45, a tension release mechanism 63, and a presser vertical movement mechanism 64 are provided inside the left end of the arm portion 23. The presser bar 44 extends in the vertical direction in the arm portion 23. The lower end of the presser bar 44 protrudes downward from the lower end of the arm portion 23. The presser bar 44 has a presser foot 48 at the lower end. A spring 45 is connected to the upper end of the presser bar 44. A knob 50 provided at the upper end of the arm portion 23 fixes the upper end of the spring 45. The spring 45 urges the presser bar 44 downward. The presser vertical movement mechanism 64 drives the presser bar 44 to move the presser foot 48 up and down. The tension release mechanism 63 adjusts the tension of the upper thread by driving a thread tensioner (not shown).

  The sewing machine 1 is provided with a partition wall 15 in a portion where the pedestal 22 and the arm 23 are connected. The partition wall 15 partitions the space in the pedestal portion 22 and the space in the arm portion 23.

  The drive mechanism of the sewing machine 1 will be described with reference to FIG. As shown in FIG. 3, the sewing machine 1 includes an upper rotating shaft 31, a connecting rotating shaft 33, a lower rotating shaft 36, and the like. The upper rotating shaft 31 extends in the left-right direction within the arm portion 23 (see FIG. 2). The connecting rotation shaft 33 extends in the up-down direction within the pedestal 22 (see FIG. 2). The lower rotating shaft 36 extends in the left-right direction within the bed portion 21 (see FIG. 2).

  The upper rotating shaft 31 is provided with a sewing machine motor (not shown) at the right end. The upper rotating shaft 31 is rotated by driving the sewing machine motor. The upper rotary shaft 31 is supported by the bearing portion 47 at a substantially central portion in the left-right direction. The bearing portion 47 has a cylindrical shape. The bearing part 47 takes in lubricating oil from the hole provided in the front side. A second supply path 82 described later is connected to the hole of the bearing portion 47. The upper rotating shaft 31 includes an umbrella-shaped gear 32 on the right side of the bearing portion 47.

  The upper rotary shaft 31 is provided with a needle bar vertical movement mechanism 41 at the left end. The needle bar vertical movement mechanism 41 supports a needle bar 43 extending in the vertical direction in the arm portion 23 (see FIG. 2). The needle bar 43 includes a sewing needle 42 at the lower end. The needle bar vertical movement mechanism 41 is driven by the rotation of the upper rotary shaft 31 by the sewing machine motor. The needle bar 43 moves up and down by driving the needle bar vertical movement mechanism 41.

  The connecting rotary shaft 33 includes an umbrella-shaped gear 34 at the upper end. The gear 34 meshes with the gear 32. The connecting rotary shaft 33 rotates as the upper rotary shaft 31 rotates. The connecting rotary shaft 33 includes an umbrella-shaped gear 35 at the lower end. The connecting rotary shaft 33 transmits the rotational driving force of the upper rotary shaft 31 rotated by the sewing machine motor to the lower rotary shaft 36.

  The lower rotating shaft 36 includes an umbrella-shaped gear 37 at the right end. The gear 37 meshes with the gear 35. The lower rotating shaft 36 rotates as the connecting rotating shaft 33 rotates. The lower rotary shaft 36 includes a full rotary hook 46 (see FIG. 2) at the left end. The full rotary hook 46 is rotated by the rotation of the lower rotary shaft 36. The full rotary hook 46 rotates in synchronization with the vertical movement of the sewing needle 42.

  The bearing portion 51 is provided on the right side of the full rotary hook 46 in the lower rotary shaft 36. The bearing portion 51 supports the lower rotary shaft 36. The bearing portion 51 includes a plunger pump (not shown) inside. The plunger pump sucks lubricating oil stored in an oil tank 10 described later through a first supply path 81. The plunger pump sends out the sucked lubricating oil to the second supply path 82. The discharge path 83 discharges the lubricating oil leaked from the plunger pump to the oil tank 10.

  The second supply path 82 extends rightward from the bearing portion 51 in the bed portion 21 and bends upward on the upper side of the oil tank 10. The second supply path 82 extends upward in the pedestal 22 (see FIG. 2) and is connected to a hole on the front side of the bearing 47. The upper rotating shaft 31 has a shaft hole (not shown) at a position facing the hole of the bearing portion 47. The shaft hole communicates with a through hole (not shown) formed in the upper rotary shaft 31. The upper rotating shaft 31 has a hole communicating with the through hole in the vicinity of the fixed gear 32. The lubricating oil sent out by the plunger pump flows into the bearing portion 47 through the second supply path 82. The lubricating oil that has flowed into the bearing portion 47 via the second supply path 82 can be supplied to the gear 32 through the shaft hole, the through hole, and the hole near the gear formed in the upper rotary shaft 31. The lubricating oil supplied to the gear 32 can suppress heat generation due to friction when the gear 32 rotates together with the gear 34, and can prevent the seizure phenomenon.

  When the gear 32 supplied with the lubricating oil rotates together with the gear 34, the lubricating oil becomes mist and scatters in the pedestal 22. Since the partition wall 15 can block the mist-like lubricating oil, the lubricating oil does not enter the arm portion 23.

  The oil tank 10 will be described with reference to FIGS. The oil tank 10 is formed of a translucent resin and is fixed to the bed portion 21 below the pedestal portion 22.

  The oil tank 10 is mainly formed of a bottom wall 102, an outer peripheral wall 101 that rises in a substantially vertical direction from the edge of the bottom wall 102, a first opposing wall 113 connected to the outer peripheral wall 101, and a second opposing wall 114.

  The bottom wall 102 includes a substantially rectangular first bottom wall 1021 formed over the entire front-rear direction of the bed portion 21, and a second bottom wall 1022 protruding leftward from the left rear end portion of the first bottom wall 1021. It is formed with.

  The left end of the first bottom wall 1021 has a recess 1213 whose substantially central portion in the front-rear direction is recessed to the right end side relative to the other left end portions. The first bottom wall 1021 has a rectangular bottom wall recess 1212 that is recessed upward from the lower surface of the first bottom wall 1021 on the rear lower surface of the recess 1213 of the first bottom wall 1021. The bottom wall recess 1212 can adsorb dust, debris, and the like contained in the lubricating oil in the lubricating oil container 12 near the bottom wall recess 1212 by fitting a magnet from the outside of the oil tank 10. The right front end and the rear end of the first bottom wall 1021 have a shape with corners removed.

  The second bottom wall 1022 has a substantially rectangular shape that is long in the left-right direction. Note that the right end of the second bottom wall 1022 is connected to the rear left end of the first bottom wall 1021. An outer peripheral wall 101 rising in a substantially vertical direction is connected to the outer peripheral edges of the first bottom wall 1021 and the second bottom wall 1022.

  The outer peripheral wall 101 includes a side wall 1011 connected to the right end of the first bottom wall 1021, a side wall 1012 connected to the front end of the first bottom wall 1021, a side wall 1013 connected to the left end of the first bottom wall 1021, a rear end of the first bottom wall 1021, A side wall 1014 connected to the rear end of the two bottom walls 1022, a side wall 1015 connected to the front end of the second bottom wall 1022, and a side wall 1016 connected to the left end of the second bottom wall 1022 are provided. The height of the side walls 1011, 1012, 1014 is substantially the same. The heights of the side walls 1013, 1015, and 1016 are substantially the same and are approximately ½ of the height of the side walls 1011, 1012, and 1014. The side wall 1013 has a shape obtained by extending the first bottom wall 1021 in the vertical direction and forms a recess 1213. As shown in FIG. 6, the upper end of the side wall 1012 protrudes leftward from the intermediate portion in the height direction. A portion of the side wall 1016 that is connected to the side wall 1014 has the same height as the side wall 1014. The side wall 1016 has substantially the same height as the side wall 1015 on the front side from the central portion in the front-rear direction.

  The oil tank 10 has a first opposing wall 113 that is substantially parallel to the first bottom wall 1021 at a substantially intermediate position in the height direction of the side walls 1011, 1012, and 1014 and has a substantially rectangular shape in plan view. The oil tank 10 has a side wall 1017 extending in the vertical direction from the left end of the first facing wall 113. The length of the side wall 1017 in the front-rear direction is shorter than the length of the front and rear of the first facing wall 113. The front and rear ends of the side wall 1017 are not connected to the side wall 1012 and the side wall 1014. The first opposing wall 113 is connected to the upper end of the side wall 1013.

  The first opposing wall 113 is provided with a receiving hole portion 1131 on the front side from the center in the front-rear direction and on the right side from the center in the left-right direction. The accommodation hole portion 1131 is located at a position separated from the outer peripheral wall 101. The accommodation hole 1131 passes through the first opposing wall 113. The first opposing wall 113 includes a first inclined portion 1132 that is inclined downward from the side wall 1012 toward the accommodation hole portion 1131 side. The first inclined portion 1132 guides the lubricating oil dropped on the upper surface of the first facing wall 113 to the accommodation hole portion 1131. The first facing wall 113 is provided with a groove 1133 along the accommodation hole 1131 around the accommodation hole 1131. The groove portion 1133 is a groove provided downward from the upper surface of the first facing wall 113. When the lubricating oil moves to the first bottom wall 1021 through the accommodation hole 1131, the groove 1133 removes foreign matters such as dust and yarn waste contained in the lubricating oil. An operator can attach a filter (not shown) using the groove 1133.

  The first facing wall 113 has a base portion 112 on the left front side. The base portion 112 located on the left side of the side wall 1013, that is, above the formation portion of the recess 1213, is provided with a cylindrical portion 60 that stands upward. The cylindrical part 60 has a cylindrical hole 601 that is a hole penetrating the inside of the cylindrical part 60 in the vertical direction. The cylindrical hole 601 is inserted with a lever member 98 described later. The height of the cylindrical portion 60 is substantially the same as the height of the side walls 1011, 1012, 1014, 1017.

  The oil tank 10 has a second opposing wall 114 above the second bottom wall 1022. The second facing wall 114 is connected to the side wall 1015, the side wall 1016, the side wall 1014, and the first facing wall 113. As shown in FIG. 8, the substantially front half of the second facing wall 114 has a shape that swells upward. A substantially rear half of the second facing wall 114 forms a second inclined portion 1141 (see FIG. 9) that is flat and has a lower right end than a left end. The right end of the second facing wall 114 is connected to the first facing wall 113.

  The oil tank 10 includes a lubricating oil container 12 surrounded by a first bottom wall 1021, a second bottom wall 1022, a first opposing wall 113, a second opposing wall 114, side walls 1011, 1012, 1013, 1014, 1015, 1016. Have The oil tank 10 includes a lubricating oil receiving portion 11 surrounded by a first opposing wall 113, a second opposing wall 114, and side walls 1011, 1012, 1014, 1015, 1016, 1017. The lubricating oil receiving portion 11 receives the lubricating oil dripped from the pedestal portion 22 through the tank opening 103 formed at the upper ends of the side walls 1011, 1012, 1014, 1015, 1016, 1017. The housing hole portion 1131 penetrates the first opposing wall 113 and communicates the lubricating oil receiving portion side with the lubricating oil housing portion side.

  Lubricating oil supplied to the sewing machine driving portion is accumulated in the lubricating oil accommodating portion 12 through the first inclined portion 1132 and the accommodating hole portion 1131 provided on the upper surface of the first opposing wall 113 of the lubricating oil receiving portion.

  The side wall 1012 that forms the lubricating oil container 12 has a front hole 1211 that passes through the side wall 1012 at a portion connected to the side wall 1013. When supplying lubricating oil to the oil tank 10 from the outside, the operator switches the sewing machine 1 to the tilted position, and inserts a lubricating oil supply hose (not shown) into the front hole 1211 to supply the lubricating oil.

  The oil tank 10 forms an inclined portion 1221 from the right front end of the second bottom wall 1022 to the side wall 1015. When the sewing machine 1 is switched to the tilted position, the inclined portion 1221 prevents the oil tank 10 from interfering with the knee operation mechanism 99 (see FIG. 2).

  The oil tank 10 has a cylindrical portion 1223 extending leftward on the side wall 1016. The cylindrical portion 1223 has a hole penetrating inside the lubricating oil accommodating portion 12 inside thereof. The cylindrical portion 1223 is connected to the first supply path 81. The plunger pump sucks up the lubricating oil inside the lubricating oil container 12 through the first supply path 81.

  As described above, in the oil tank 10, the lubricating oil receiving portion 11 covers the lower side of the pedestal portion 22, so that the lubricating oil supplied to the gear 32 can be received by the lubricating oil receiving portion 11. Therefore, the oil tank 10 can reliably collect the lubricating oil supplied to the gear 32. The oil tank 10 can store the lubricating oil accumulated on the first opposing wall 113 and the second opposing wall 114 in the lubricating oil storage portion 12 through the storage hole portion 1131. When the sewing machine 1 vibrates, vibration is applied to the lubricating oil accommodated in the lubricating oil accommodating portion 12. However, since the oil tank 10 is provided with the first facing wall 113 and the second facing wall 114, the lubricating oil does not leak to the outside of the lubricating oil accommodating portion 12 even if the lubricating oil vibrates.

  The presser vertical movement mechanism 64 will be described with reference to FIG. The presser vertical movement mechanism 64 includes a crank member 71, a shaft 72, a locking member 73, and a presser lifting lever 74. The presser bar 44 is provided with a locking member 73 at a substantially central portion in the vertical direction. The locking member 73 is rod-shaped and extends in the front-rear direction. The front side of the locking member 73 is fixed to the presser bar 44 with screws.

  The crank member 71 is provided on the lower side and the right side of the locking member 73. The crank member 71 is a bent plate material. The crank member 71 extends rightward from below the locking member 73, and bends upward at a right angle at the right end and extends upward. The shaft 72 supports a bent portion of the crank member 71 so as to be swingable. The crank member 71 is provided with a presser lift lever 74 on the rear side. The presser foot lifting lever 74 is used by the operator to manually move the presser foot 48 up and down directly.

  The knee raising mechanism will be described with reference to FIG. The knee raising mechanism mainly includes a linkage 62 having one end connected to the upper end of the crank member 71, a crank member 65, and a lever member 98. The connecting rod 62 extends rightward from the crank member 71, penetrates the partition wall 15, and has the other end connected to the crank member 65 provided on the right side of the partition wall 15. As shown in FIG. 2, the linkage 62 is inclined downward from the distal end side of the arm portion 23 toward the pedestal portion 22 side.

  The crank member 65 is a bent member. The crank member 65 extends upward on the right side of the partition wall 15 and bends rightward at the upper end at a right angle. The shaft 66 supports the bent portion of the crank member 65 in a swingable manner. The connecting rod 62 is connected to the lower end of the portion of the crank member 65 that extends downward. The crank member 65 is connected to the upper end of the lever member 98 at the right end of the portion extending rightward. The crank member 65 can swing around the shaft 66 by the vertical movement of the lever member 98.

  The lever member 98 extends in the vertical direction within the pedestal 22 (see FIG. 2). The lower end of the lever member 98 is connected to a knee operation mechanism 99 (see FIG. 2) below the oil tank 10. The knee operation mechanism 99 includes a shaft support portion (not shown) fixed to an under cover (not shown) that covers the lower portion of the bed portion 21, a shaft 991, and an operation portion 992 rotatably supported by the shaft 991. I have. The under cover is attached to the sewing machine table, and covers the lower part of the bed portion 21 when the sewing machine 1 is placed on the table. When the sewing machine 1 is placed on the table, the operation portion 992 has an engaging portion that can engage with the lever member 98 at the tip. The operation unit 992 is connected to a knee operation lever 97 (see FIG. 1) that can be operated by the operator. The operator operates the knee operation lever 97 using the knee. When the operator operates the knee operation lever 97, the operation unit 992 rotates. When the operation part 992 rotates, the engaging part moves the lower end of the lever member 98 up and down.

  The lever member 98 is inserted through the cylindrical hole 601 of the oil tank 10 below the center in the vertical direction. The lever member 98 fixes a covering member 981 that covers the cylindrical portion 60 from above. The covering member 981 is, for example, a resin such as rubber. The covering member 981 includes a first covering portion 9811 that covers the upper surface of the cylindrical portion 60 and a second covering portion 9812 that covers the side surface of the cylindrical portion 60. The covering member 981 prevents the lubricating oil adhering to the lever member 98 in the pedestal portion 22 from leaking from the cylindrical hole 601 to the outside of the oil tank 10 when falling along the lever member 98.

  In the covering member 981, when the lever member 98 is located at the lowermost position, the second covering portion 9812 covers the entire side surface of the cylindrical portion 60. In the covering member 981, the lower end of the second covering portion 9812 is located below the upper end of the cylindrical portion 60 when the lever member 98 is located at the uppermost position. Therefore, even if the lever member 98 moves up and down by the knee operation mechanism 99, the covering member 981 can prevent the lubricating oil falling through the lever member 98 from leaking out of the oil tank 10 from the cylindrical hole 601.

  The driving principle of the presser vertical movement mechanism 64 will be described. When the presser foot 48 is moved downward, the operator releases the knee from the knee operation lever 97. When the knee is released from the knee operation lever 97, the operation unit 992 rotates clockwise (in FIG. 12). When the operation portion 992 rotates, the engaging portion moves downward, and the lever member 98 moves downward. When the lever member 98 moves downward, the crank member 65 swings clockwise (in FIG. 11) about the shaft 66. Due to the swing of the crank member 65, the linkage 62 moves to the left. By the movement of the linkage 62, the crank member 71 of the presser vertical movement mechanism 64 swings counterclockwise (in FIG. 11) about the shaft 72. A portion of the crank member 71 extending leftward is moved downward by swinging. Due to the biasing force of the spring 45, the locking member 73 and the presser bar 44 move downward. Therefore, the presser foot 48 connected to the presser bar 44 moves downward.

  When moving the presser foot 48 upward, the operator pushes the knee operation lever 97 with the knee. When the knee operation lever 97 is pushed with the knee, the operation unit 992 rotates counterclockwise (in FIG. 12). When the operation portion 992 rotates, the engaging portion moves upward, and the lever member 98 moves upward. When the lever member 98 moves upward, the crank member 65 swings counterclockwise (in FIG. 11) about the shaft 66. As the crank member 65 swings, the linkage 62 moves to the right. By the movement of the linkage 62, the crank member 71 of the presser vertical movement mechanism 64 swings in the clockwise direction (in FIG. 11) about the shaft 72. A portion of the crank member 71 that extends leftward is moved upward by swinging. As the crank member 71 moves, the locking member 73 and the presser bar 44 move upward. Therefore, the presser foot 48 connected to the presser bar 44 moves upward.

  The tension release mechanism 63 will be described. The tension release mechanism 63 includes a thread loosening plate 75. The thread loosening plate 75 is a plate-like member extending in the vertical direction. The thread loosening plate 75 can swing around the lower end. The thread loosening plate 75 is connected to a thread tensioner (not shown). When the thread loosening plate 75 swings counterclockwise, it can drive the thread tensioner to apply tension to the upper thread. When the thread loosening plate 75 swings in the clockwise direction, the thread tensioner can be driven to loosen the upper thread.

  The driving principle of the tension release mechanism 63 will be described. When tension is applied to the upper thread, the solenoid 70 (see FIG. 3) loosens the wire 61 by an operator operating a switch (not shown). The wire 61 passes through the tube 67 and is connected to the solenoid 70. The thread loosening plate 75 provided at the left end of the wire 61 swings counterclockwise. The thread loosening plate 75 drives a thread tensioner to apply tension to the upper thread. When the upper thread is loosened, the operator operates the switch so that the solenoid 70 pulls the wire 61. The thread loosening plate 75 provided at the left end of the wire 61 swings in the clockwise direction. The thread loosening plate 75 drives the thread tensioner to loosen the upper thread.

  As shown in FIG. 2, the wire 61 and the connecting rod 62 are always provided so as to be inclined downward from the distal end side of the arm portion 23 toward the leg pillar portion 22 side. The inclination angle is, for example, 1 to 3 degrees with respect to the horizontal direction.

  Lubricating oil supplied to the gear 32 (see FIG. 3) is sprayed into the pedestal portion 22 as a mist by the rotation of the gear 32. The mist-like lubricating oil may adhere to the wire 61 and the linkage 62 within the pedestal portion 22. The wire 61 and the linkage 62 are always inclined downward from the distal end side of the arm portion 23 toward the pedestal portion 22 side. Therefore, the lubricating oil adhering to the wire 61 and the connecting rod 62 moves toward the inside of the pillar portion 22 through the wire 61 and the connecting rod 62 due to gravity. Lubricating oil adhering to the wire 61 and the connecting rod 62 is transmitted to the pedestal portion 22 and is not transmitted to the distal end side of the arm portion 23. Therefore, the sewing machine 1 can prevent the lubricating oil from accumulating at the tip of the arm portion 23 and prevent the lubricating oil from dropping from the tip of the arm portion 23 to contaminate the workpiece and the thread. Since the sewing machine 1 does not collect lubricating oil at the tip of the arm 23, there is no need to provide a recovery mechanism (such as a pump) for collecting the lubricating oil collected at the tip of the arm 23.

  The lubricating oil that has moved through the wire 61 and the connecting rod 62 and moved into the pedestal 22 is dripped downward. The lubricating oil receiving portion 11 of the oil tank 10 provided below the pedestal 22 receives the lubricating oil dripped from the wire 61 and the linkage 62. The lubricating oil received by the lubricating oil receiving portion 11 passes through the receiving hole portion 1131 and the lubricating oil containing portion 12 contains the lubricating oil. The lubricating oil accumulated in the lubricating oil storage part 12 flows into the plunger pump (not shown) in the bearing part 51 via the first supply path 81. The plunger pump sends the lubricating oil again to the gear 32 (see FIG. 3) via the second supply path 82. The sewing machine 1 can collect the lubricating oil adhering to the wire 61 and the linkage 62 by the oil tank 10 and then reuse it as the lubricating oil supplied to the gear 32 again.

  As described above, the sewing machine 1 has the cylindrical portion in which the cylindrical hole 601 through which the lever member 98 that drives the presser vertical movement mechanism 64 is inserted is erected upward in the base portion 112 exposed from the concave portion 1213 of the oil tank 10. 60. The lever member 98 fixes a covering member 981 that covers the cylindrical portion 60 provided with the cylindrical hole 601 from above. Therefore, the sewing machine 1 can prevent the lubricating oil adhering to the lever member 98 within the columnar portion 22 from leaking from the cylindrical hole 601 to the outside of the oil tank 10 when falling along the lever member 98.

  In the covering member 981, the second covering portion 9812 covers the entire circumference of the cylindrical portion 60 when the lever member 98 is located at the lowest position. In the covering member 981, the lower end of the second covering portion 9812 is located below the upper end of the cylindrical portion 60 when the lever member 98 is located at the uppermost position. Therefore, even if the lever member 98 is moved up and down by the knee operation mechanism 99, the sewing machine 1 can prevent the lubricating oil falling through the lever member 98 from leaking from the cylindrical hole 601 to the outside of the oil tank 10.

  The oil tank 10 includes a lubricating oil container 12 surrounded by a first bottom wall 1021, a second bottom wall 1022, a first opposing wall 113, a second opposing wall 114, side walls 1011, 1012, 1013, 1014, 1015, 1016. In addition, lubricating oil can be stored. When the sewing machine 1 moves and vibrates, vibration from the sewing machine 1 is applied to the lubricating oil accommodated in the lubricating oil accommodating portion 12. Since the oil tank 10 is provided with the first facing wall 113, the oil tank 10 does not leak to the outside of the lubricating oil container 12 even if the lubricating oil vibrates.

  The presser foot 48 corresponds to the “cloth presser mechanism” of the present invention. The lever member 98 corresponds to the “knee raising mechanism” of the present invention. The covering member 981 corresponds to the “cover member” of the present invention. The cylindrical portion 60 corresponds to the “projection” of the present invention. The first covering portion 9811 corresponds to the “first cover” of the present invention. The second covering portion 9812 corresponds to the “second cover” of the present invention. The cylindrical hole 601 corresponds to the “through hole” of the present invention. The tank opening 103 corresponds to the “opening” of the present invention. The bottom wall 102 corresponds to the “bottom” of the present invention. The accommodation hole 1131 corresponds to the “hole” of the present invention. The recess 1213 corresponds to the “recess” of the present invention. The base 112 corresponds to the “concave upper wall” of the present invention.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. In the above-described embodiment, the oil tank 10 is provided with the cylindrical hole 601 in the cylindrical portion 60 erected upward from the base portion 112. The oil tank 10 may be formed with a hole through which the lever member 98 can be directly inserted into the base portion 112 without providing the cylindrical portion 60.

  In the above-described embodiment, the upper end portion of the cylindrical portion 60 is located in the tank opening portion 103. The cylindrical portion 60 is not limited to the above shape. For example, the cylindrical portion 60 may have an upper end portion located between the tank opening portion 103 and the base portion 112.

  In the above-described embodiment, the covering member 981 covers the entire circumference of the cylindrical portion 60. The covering member 981 is not limited to the above shape. For example, the covering member 981 may cover only the upper end portion of the cylindrical portion 60.

  In the above-described embodiment, the oil tank 10 includes the first opposing wall 113 that is substantially parallel to the first bottom wall 1021 at a substantially intermediate position in the height direction of the side walls 1011, 1012, and 1014 and has a substantially rectangular shape in plan view. Provided. For example, the oil tank 10 may not include the first facing wall 113.

  In the above-described embodiment, the oil tank 10 is provided with the second bottom wall 1022 protruding leftward from the left rear end portion of the first bottom wall 1021. The oil tank 10 is not limited to the above shape. For example, the oil tank 10 may not include the second bottom wall 1022. In this case, the oil tank 10 may be formed by the first bottom wall 1021, the outer peripheral wall 101 rising from the edge of the first bottom wall 1021 in a substantially vertical direction, and the first opposing wall 113 connected to the outer peripheral wall 101.

DESCRIPTION OF SYMBOLS 1 Sewing machine 10 Oil tank 11 Lubricating oil receiving part 12 Lubricating oil accommodating part 21 Bed part 22 Leg column part 23 Arm part 48 Presser foot 60 Cylindrical part 64 Presser up-and-down moving mechanism 98 Lever member 99 Knee operating mechanism 101 Outer peripheral wall 102 Bottom wall 103 Tank opening portion 112 Base portion 113 First opposing wall 114 Second opposing wall 601 Cylindrical hole 981 Cover member 1131 Receiving hole portion 1132 First inclined portion 1213 Recessed portion 9811 First covering portion 9812 Second covering portion

Claims (5)

A presser foot mechanism for pressing the work cloth,
A presser up / down movement mechanism that moves up and down the presser foot mechanism;
In a sewing machine having a lever member extending in the vertical direction and a knee raising mechanism for driving the presser vertical movement mechanism,
An oil tank capable of storing lubricating oil;
A through hole provided in the oil tank and penetrating the lever member of the knee raising mechanism;
A sewing machine comprising: a cover member provided on the knee raising mechanism and covering the through hole. The oil tank forms a protrusion in the vertical direction,
The through hole is formed in the projecting portion in parallel with the projecting direction,
The said cover member was equipped with the 1st cover which covers the said through-hole, and the 2nd cover which covers the side surface perimeter of the said protrusion part along the said protrusion direction of the said protrusion part. The described sewing machine. The oil tank is
An outer peripheral wall forming an opening that opens upward;
The bottom wall,
An opposing wall, which is a wall facing the bottom wall, formed on the inner side of the outer peripheral wall, provided between the opening and the bottom wall and at a position separated from the bottom wall;
A hole communicating the opening side and the bottom wall side of the opposing wall;
Forming an oil receiver that receives the lubricating oil falling from the opening with the outer peripheral wall and the opposing wall;
3. The sewing machine according to claim 1, wherein the outer peripheral wall, the opposing wall, and the bottom wall form an oil storage portion that recovers the lubricating oil received by the oil receiving portion from the hole portion. A part of the outer peripheral wall of the oil containing part is recessed on the opposing outer peripheral wall side, and a concave part exposing the bottom wall side of the opposing wall;
Of the opposing walls of the oil receiving part, further comprising a concave upper wall exposed from the concave part,
The sewing machine according to claim 3, wherein the protrusion is provided on the upper wall of the recess. The said protrusion part protrudes from the said recessed part upper wall to the said opening part, The said 2nd cover covers from the said recessed part upper wall of the said protrusion part to the protrusion end of the said protrusion part, The Claim 4 characterized by the above-mentioned. sewing machine.

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