Sewing machine

Abstract

Lubricating oil is prevented from being attached to parts which do not need the lubricating oil in the sewing machine. The sewing machine includes a sewing machine motor; a needle plate; a lower shaft disposed below the needle plate and rotated by power generated by a sewing machine motor; a conversion member which is fixed to the lower shaft and converts the rotational motion of the lower shaft into a swinging motion; a holding member that holds at least a portion of the conversion member; an oil supply port for supplying lubricating oil between the conversion member and the holding member; and a first cover disposed on at least a portion of the periphery of the conversion member, the size of the first cover being smaller than the size of the lower shaft in the axial direction of the lower shaft.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a sewing machine. Background Art

[0002] In the technical field related to sewing machines, a sewing machine including an oil pan as disclosed in Patent Document 1 is known.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 06-121895 Summary of the Invention

[0006] (1) Technical issues to be resolved

[0007] There are only a limited number of areas in a sewing machine that require lubrication. If the oil pan is enlarged, lubrication may adhere to areas that do not require lubrication.

[0008] The technology disclosed in this specification aims to suppress the adhesion of lubricating oil to unnecessary portions of a sewing machine.

[0009] (2) Technical solution

[0010] This specification discloses a sewing machine. The sewing machine comprises: a sewing machine motor; a needle plate; a lower shaft disposed below the needle plate and rotated by the power generated by the sewing machine motor; a conversion member fixed to the lower shaft and converting the lower shaft's rotational motion into oscillating motion; a retaining member that retains at least a portion of the conversion member; an oil supply port that supplies lubricating oil between the conversion member and the retaining member; and a first cover disposed around at least a portion of the conversion member. In the axial direction of the lower shaft, the first cover is smaller than the lower shaft.

[0011] (3) Beneficial effects

[0012] According to the technology disclosed in this specification, it is possible to suppress the lubricating oil from adhering to the portion where the lubricating oil is not needed in the sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view showing the sewing machine according to the first embodiment, as seen from the upper left rear side.

[0014] Figure 2 This is a perspective view showing a portion of the sewing machine according to the first embodiment, as seen from the upper left rear side.

[0015] Figure 3 This is a perspective view showing a portion of the sewing machine according to the first embodiment, as seen from the upper left rear side.

[0016] Figure 4 It is a perspective view showing a part of the sewing machine according to the first embodiment, as seen from the upper right front.

[0017] Figure 5 This is a perspective view showing a portion of the sewing machine according to the first embodiment, as seen from the upper left rear side.

[0018] Figure 6 It is a perspective view showing a part of the sewing machine according to the first embodiment, as seen from the upper right front.

[0019] Figure 7 This is a perspective view showing a portion of the sewing machine according to the first embodiment, as seen from the upper left rear side.

[0020] Figure 8 It is a perspective view showing a part of the sewing machine according to the first embodiment, as seen from the upper right front.

[0021] Figure 9 This is a diagram showing a portion of the sewing machine according to the first embodiment as viewed from the right.

[0022] Figure 10 This is a diagram showing a portion of the sewing machine according to the first embodiment as viewed from the right.

[0023] Figure 11 This is a diagram showing a portion of the sewing machine according to the first embodiment as viewed from the rear.

[0024] Figure 12 It is a cross-sectional view showing a part of the sewing machine according to the first embodiment.

[0025] Figure 13 It is a perspective view showing a part of the sewing machine according to the first embodiment, as seen from the upper left front.

[0026] Figure 14 It is a perspective sectional view showing a part of the sewing machine according to the first embodiment, as seen from the upper left front.

[0027] Figure 15 It is a cross-sectional view showing a part of the sewing machine according to the first embodiment.

[0028] Figure 16 This is an exploded perspective view showing a portion of the sewing machine according to the first embodiment, as seen from the upper left front.

[0029] Figure 17 It is a cross-sectional view showing a first cover according to the second embodiment.

[0030] Figure 18 This is a perspective view showing a portion of the sewing machine according to the third embodiment, as seen from the upper left rear side.

[0031] Figure 19A perspective view showing a portion of a sewing machine according to a third embodiment, as seen from the upper right front.

[0032] Figure 20 It is a perspective view showing a part of the sewing machine according to the third embodiment, as seen from the upper left front.

[0033] Figure 21 This is an exploded perspective view showing a portion of the sewing machine according to the third embodiment, as seen from the upper left front.

[0034] Figure 22 It is a sectional perspective view showing a part of the sewing machine according to the third embodiment, as seen from the upper left rear side.

[0035] Description of reference numerals:

[0036] 1: Sewing machine; 2: Sewing machine base; 3: Sewing machine head; 4: Sewing machine needle; 5: Needle bar; 6: Thread take-up lever; 6C: Cover; 7: Needle plate; 8: Presser foot; 9A: Upper thread adjuster; 9B: Lower thread adjuster; 10: Feed foot; 11: Feed gear; 12: Sewing machine motor; 13: Base component; 14: Drive shaft; 14A: Pulley; 15: Belt; 16: Driven shaft (lower shaft); 16A: Pulley; 17: Horizontal feed shaft; 18: Feed gear drive mechanism; 18A: Support arm; 18B: First link mechanism; 18C: Second link mechanism; 19: Upper and lower feed Feed shaft; 20: Looper; 21: Looper drive mechanism; 22: Connecting member; 22A: Spherical portion; 22B: Holding portion; 22S: Sliding surface; 22T: Holding surface; 23: Looper shaft; 24: Bearing; 25: Bearing; 30: Pump; 31: Joint; 32: Movable member; 33: Plate; 34: Coil spring; 35: Eccentric sleeve; 36: Pump body; 37: Joint; 40: First cover; 40A: Front plate; 40B: Rear plate; 40C: Left plate; 40D: Right plate; 40E: Bottom plate; 41: Joint; 42: Screw; 43: Recess; 45: Over Filter element; 50: Second cover; 51: Rear end portion; 51A: Opening for screw; 52: Front end portion; 53: Hole; 60: Transfer portion; 60A: Passageway; 61: Joint; 62: Bearing; 62A: Passageway; 63: Retaining hole; 70: Fixing plate; 80: Conversion component; 81: Right sleeve portion; 81A: Internal space; 82: Left sleeve portion; 83: Right flange portion; 84: Left flange portion; 85: Spherical bearing; 85A: Passageway; 85C: Oil supply port; 85S: Bearing surface; 90: Connecting rod (retaining component); 91: Lower retaining portion; 91S: Sliding surface; 92: Upper retaining portion; 92S: retaining surface; 93: rod portion; 94: screw; 95: screw; 101: first tube; 102: second tube; 161: right driven shaft (right lower shaft); 161A: hole; 161B: hollow hole; 162: left driven shaft (left lower shaft); 300: connecting mechanism; 340: first cover; 340A: front plate portion; 340B: rear plate portion; 340C: left plate portion; 340D: right plate portion; 340E: bottom plate portion; 350: second cover; 351: screw; 360: reflux component; CX: center axis; DX: center axis; EX: center axis. DETAILED DESCRIPTION

[0037] Below, the embodiment is described with reference to the drawings in the specification. In the embodiment, an XYZ orthogonal coordinate system is set, and the positional relationship of each part is described with reference to the XYZ orthogonal coordinate system. The direction parallel to the X-axis of the specified surface is referred to as the X-axis direction. The direction parallel to the Y-axis of the specified surface is referred to as the Y-axis direction, wherein the Y-axis of the specified surface is orthogonal to the X-axis. The direction parallel to the Z-axis is referred to as the Z-axis direction, wherein the Z-axis is orthogonal to the specified surface. In addition, the rotation direction or tilt direction centered on the X-axis is referred to as the θX direction. The rotation direction or tilt direction centered on the Y-axis is referred to as the θY direction. The rotation direction or tilt direction centered on the Z-axis is referred to as the θZ direction.

[0038] In the embodiment, the predetermined plane is parallel to the horizontal plane. The X-axis direction is the front-to-back direction. The Y-axis direction is the left-to-right direction. The Z-axis direction is the up-down direction. The +X direction is the front direction, and the -X direction is the rear direction. The +Y direction is the left direction, and the -Y direction is the right direction. The +Z direction is the upward direction, and the -Z direction is the downward direction. Furthermore, the XY plane may be tilted relative to the horizontal plane.

[0039] [First embodiment]

[0040] A first embodiment will be described.

[0041] Sewing Machine

[0042] Figure 1 It is a perspective view showing the sewing machine 1 according to the embodiment, as seen from the upper left rear side. Figure 2 This is a perspective view showing a portion of a sewing machine 1 according to the embodiment, as viewed from the upper left rear side. The sewing machine 1 is an industrial sewing machine that performs double-thread lockstitching.

[0043] like Figure 1 as well as Figure 2 As shown, the sewing machine 1 includes: a sewing machine base 2, a sewing machine head 3, a needle bar 5, a thread take-up lever 6, a needle plate 7, a presser foot 8, an upper thread regulator 9A, a lower thread regulator 9B, a feed foot 10, a feed tooth 11 and a sewing machine motor 12.

[0044] The sewing machine head 3 is arranged above the sewing machine base 2. The needle bar 5, thread take-up lever 6, presser foot 8, upper thread regulator 9A, lower thread regulator 9B, feed foot 10, and sewing machine motor 12 are supported by the sewing machine head 3.

[0045] The needle bar 5 holds the sewing machine needle 4. The needle bar 5 holds the sewing machine needle 4 so that the sewing machine needle 4 is parallel to the Z axis. The needle bar 5 holds multiple sewing machine needles 4. In the embodiment, the needle bar 5 holds two sewing machine needles 4. The needle bar 5 holds the sewing machine needle 4 and reciprocates in the vertical direction. The sewing machine needle 4 has a threading hole for passing the needle thread. The sewing machine needle 4 holds the needle thread on the inner surface of the threading hole. As the needle bar 5 reciprocates in the vertical direction, the sewing machine needle 4 reciprocates in the vertical direction while holding the needle thread.

[0046] The thread take-up lever 6 supplies the needle thread to the sewing machine needle 4. In the embodiment, the thread take-up lever 6 is located inside the cover 6C. The thread take-up lever 6 reciprocates vertically while holding the needle thread. The thread take-up lever 6 has a retaining hole through which the needle thread passes. The thread take-up lever 6 retains the needle thread on the inner surface of the retaining hole. The thread take-up lever 6 reciprocates vertically to deliver the needle thread used in sewing an object or to pick up the needle thread.

[0047] The needle plate 7 is positioned below the needle bar 5. It supports the object to be sewn from below. The needle plate 7 supports the object to be sewn below the needle bar 5. The sewing machine needle 4, held by the needle bar 5, faces the needle plate 7. The needle plate 7 has a needle hole through which the sewing machine needle 4 can pass. The sewing machine needle 4, which penetrates the object to be sewn supported by the needle plate 7, passes through the needle hole.

[0048] The presser foot 8 presses the sewing object supported by the needle plate 7 from above. The presser foot 8 is arranged at least partially around the sewing machine needle 4.

[0049] The upper thread regulator 9A applies tension to the upper thread supplied to the sewing machine needle 4. The upper thread is supplied from an upper thread supply source to the upper thread regulator 9A.

[0050] The lower thread adjuster 9B applies tension to the lower thread supplied to the looper 20 described later. The lower thread is supplied from a lower thread supply source to the lower thread adjuster 9B.

[0051] The feed foot 10 operates to feed the sewing object supported by the needle plate 7 forward. The feed foot 10 is positioned above the needle plate 7. The feed foot 10 contacts the upper surface of the sewing object. The feed foot 10 moves along a predetermined feed track, thereby feeding the sewing object forward.

[0052] The feed teeth 11 operate to feed the sewing object supported by the needle plate 7 forward. At least a portion of the feed teeth 11 is positioned below the needle plate 7. The feed teeth 11 emerge and retract from an opening provided in the needle plate 7. The feed teeth 11 contact the lower surface of the sewing object. The feed teeth 11 move along a predetermined feed trajectory, thereby feeding the sewing object forward.

[0053] The sewing machine motor 12 generates power for operating the needle bar 5, the feed foot 10, the feed teeth 11, and the looper 20. The sewing machine motor 12 includes a pulse motor.

[0054] <Internal structure of the sewing machine base>

[0055] Next, the internal structure of the sewing machine base 2 will be described. The components of the internal structure of the sewing machine base 2 are arranged below the throat plate 7.

[0056] Figure 3 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left rear side. Figure 4 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper right front. Figure 5 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left rear side. Figure 6 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper right front. Figure 5 Equivalent to Figure 3 The image after removing some of its components. Figure 6 Equivalent to Figure 4 The image after removing some of its components.

[0057] like Figure 3 、 Figure 4 、 Figure 5 as well as Figure 6 As shown, the sewing machine 1 includes: a feed tooth 11, a base component 13, a drive shaft 14, a belt 15, a driven shaft 16, a feed tooth drive mechanism 18, a looper 20, a conversion component 80, a looper drive mechanism 21, a pump 30, a first cover 40, a fixing plate 70, a second cover 50 and a transfer part 60.

[0058] The base member 13 is fixed to at least a portion of the sewing machine bed 2 inside the sewing machine bed 2. The position of the base member 13 is substantially fixed.

[0059] The drive shaft 14 is positioned below the needle plate 7. The drive shaft 14 is rotatably supported on the base member 13 via a bearing. The drive shaft 14 extends in the left-right direction. The right end of the drive shaft 14 is connected to the sewing machine motor 12 via a power transmission mechanism (not shown). The drive shaft 14 rotates by the power generated by the sewing machine motor 12. The drive shaft 14 rotates in the θY direction about the central axis CX of the drive shaft 14. The central axis CX of the drive shaft 14 is parallel to the Y axis.

[0060] The driven shaft 16 is arranged below the needle plate 7. The driven shaft 16 is rotatably supported on the base member 13 via a bearing. The driven shaft 16 extends in the left-right direction. The driven shaft 16 is arranged in front of the drive shaft 14. The driven shaft 16 and the drive shaft 14 are arranged in parallel. The driven shaft 16 is rotated by the power generated by the sewing machine motor 12. In the embodiment, the gear provided at the left end of the drive shaft 14 and the gear provided at the left end of the driven shaft 16 are connected via a belt 15. When the drive shaft 14 is rotated by the power generated by the sewing machine motor 12, the rotational force of the drive shaft 14 is transmitted to the driven shaft 16 via the belt 15. The driven shaft 16 rotates in the θY direction synchronously with the drive shaft 14 around the center axis DX of the driven shaft 16. The center axis DX of the driven shaft 16 is parallel to the Y axis.

[0061] The feed tooth drive mechanism 18 operates so that the feed tooth 11 moves along a predetermined feed trajectory. The feed tooth drive mechanism 18 includes a horizontal feed shaft 17, a vertical feed shaft 19, a support arm 18A that supports the feed tooth 11, a first link mechanism 18B connecting the horizontal feed shaft 17 and the support arm 18A, and a second link mechanism 18C connecting the horizontal feed shaft 17 and the support arm 18A.

[0062] The horizontal feed shaft 17 is rotatably supported on the sewing machine base 2 via a bearing. The horizontal feed shaft 17 extends in the left-right direction. The horizontal feed shaft 17 is arranged in front of the driven shaft 16. The horizontal feed shaft 17 and the driven shaft 16 are arranged in parallel. The right end of the horizontal feed shaft 17 is connected to the sewing machine motor 12 via a power transmission mechanism (not shown). The horizontal feed shaft 17 is rotated by the power generated by the sewing machine motor 12. The horizontal feed shaft 17 rotates in the θY direction around the center axis of the horizontal feed shaft 17. The center axis of the horizontal feed shaft 17 is parallel to the Y axis.

[0063] The upper and lower feed shafts 19 are rotatably supported on the sewing machine base 2 via bearings. The upper and lower feed shafts 19 extend in the left-right direction. The upper and lower feed shafts 19 are arranged behind the drive shaft 14. The upper and lower feed shafts 19 are arranged in parallel with the horizontal feed shaft 17. The right end of the upper and lower feed shafts 19 is connected to the sewing machine motor 12 via a power transmission mechanism (not shown). The upper and lower feed shafts 19 are rotated by the power generated by the sewing machine motor 12. The upper and lower feed shafts 19 rotate in the θY direction around the center axis of the upper and lower feed shafts 19. The center axis of the upper and lower feed shafts 19 is parallel to the Y axis.

[0064] The first link mechanism 18B is connected to the left end portion of the horizontal feed shaft 17. The first link mechanism 18B is actuated by the rotation of the horizontal feed shaft 17. The support arm 18A reciprocates in the front-rear direction by the actuation of the first link mechanism 18B.

[0065] The second link mechanism 18C is connected to the left end portion of the vertical feed shaft 19. The second link mechanism 18C is actuated by the rotation of the vertical feed shaft 19. The support arm 18A is reciprocated in the vertical direction by the actuation of the second link mechanism 18C.

[0066] The first link mechanism 18B and the second link mechanism 18C operate synchronously. The support arm 18A reciprocates in the front-back and up-down directions through the operation of the first link mechanism 18B and the second link mechanism 18C. The movement of the support arm 18A causes the feed teeth 11 supported by the support arm 18A to move along a predetermined feed trajectory.

[0067] Figure 7 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left rear side. Figure 8 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper right front. Figure 9 This is a diagram showing a portion of the sewing machine 1 according to the embodiment, as seen from the right. Figure 7 Equivalent to Figure 5 The image after removing some of its components. Figure 8 Equivalent to Figure 6 The image after removing some of its components. Figure 9 Equivalent to observing from the right Figure 7 as well as Figure 8 Picture.

[0068] The looper 20 supplies the lower thread to the sewing object. The looper 20 is supported by a looper drive mechanism 21. The looper 20 rotates in the θX direction, hooking the upper thread from the sewing machine needle 4 after it passes through the sewing object and the needle hole of the needle plate 7, and winding it with the lower thread. A plurality of loopers 20 are provided. The same number of loopers 20 as the sewing machine needles 4 are provided. In the embodiment, two loopers 20 are provided.

[0069] The conversion member 80 is fixed to the driven shaft 16. The conversion member 80 rotates together with the driven shaft 16. The conversion member 80 converts the rotational motion of the driven shaft 16 into a swinging motion. The conversion member 80 connects the driven shaft 16 and the looper drive mechanism 21.

[0070] The looper drive mechanism 21 operates by rotating the looper 20 in the θX direction based on the power generated by the sewing machine motor 12. The looper drive mechanism 21 is connected to the conversion member 80. The power generated by the sewing machine motor 12 is transmitted to the looper drive mechanism 21 via the drive shaft 14, the belt 15, the driven shaft 16, and the conversion member 80. The looper drive mechanism 21 is operated by the rotation of the conversion member 80.

[0071] The looper drive mechanism 21 includes a connecting rod 90 connected to the conversion member 80; a connecting member 22 connected to the connecting rod 90; and a looper shaft 23 connected to the connecting member 22. The connecting rod 90 holds at least a portion of the conversion member 80. The looper shaft 23 is connected to the connecting rod 90 via the connecting member 22. The looper shaft 23 is rotatably supported by bearings 24 and 25. The looper 20 is fixed to the looper shaft 23.

[0072] The pump 30 discharges lubricating oil. The pump 30 is located outside the first cover 40. The pump 30 is located outside the second cover 50. The pump 30 is supported by the base member 13. The pump 30 includes a joint 31 for discharging lubricating oil. The joint 31 is connected to the transfer unit 60 via a first tube 101. Lubricating oil discharged from the joint 31 is supplied to the transfer unit 60 via the first tube 101.

[0073] The transfer unit 60 transfers the lubricating oil supplied from the pump 30. The transfer unit 60 is provided on a portion of the base member 13. The transfer unit 60 includes a joint 61 to which the lubricating oil from the pump 30 is supplied. The joint 61 is connected to the joint 31 of the pump 30 via a first tube 101. The lubricating oil discharged from the joint 31 and supplied to the joint 61 via the first tube 101 is supplied to the conversion member 80 via the transfer unit 60 and the driven shaft 16.

[0074] As will be described later, the sewing machine 1 includes an oil supply port 85C for supplying lubricating oil between the conversion member 80 and the connecting rod 90. The oil supply port 85C is provided on the conversion member 80. The pump 30 discharges the lubricating oil supplied to the oil supply port 85C. The lubricating oil supplied to the conversion member 80 from the pump 30 via the intermediate portion 60 and the driven shaft 16 is supplied from the oil supply port 85C provided on the conversion member 80 to the space between the conversion member 80 and the connecting rod 90.

[0075] The first cover 40 is disposed around at least a portion of the conversion member 80. The first cover 40 covers at least a portion of the conversion member 80 from below. The first cover 40 suppresses the scattering of lubricating oil supplied from the oil supply port 85C between the conversion member 80 and the connecting rod 90. The first cover 40 is fixed to the base member 13 via the fixing plate 70.

[0076] The second cover 50 is disposed around at least a portion of the switching member 80. The second cover 50 covers at least a portion of the switching member 80 from above. The second cover 50 suppresses scattering of lubricating oil supplied from the oil supply port 85C between the switching member 80 and the connecting rod 90. The second cover 50 is connected to the connecting rod 90.

[0077] Figure 10 This is a diagram showing a portion of the sewing machine 1 according to the embodiment as viewed from the right. Figure 10 It is equivalent to extracting Figure 9 A diagram showing some of the constituent elements.

[0078] like Figure 9 as well as Figure 10 As shown, the pump 30 is arranged behind the drive shaft 14. The pump 30 includes: a pump body 36; a joint 31 protruding rearward from the rear surface of the pump body 36; a movable part 32 arranged in the front part of the pump body 36; a plate 33 fixed to the movable part 32; and a coil spring 34 connected to the plate 33. The pump body 36 is fixed to the base part 13. The movable part 32 is supported on the pump body 36 so as to be movable in the front-back direction. A part of the coil spring 34 is connected to the front surface of the pump body 36. Another part of the coil spring 34 is connected to the plate 33. The coil spring 34 generates an elastic force that separates the plate 33 from the pump body 36. In other words, the coil spring 34 generates an elastic force that moves the movable part 32 forward.

[0079] The drive shaft 14 rotates in the θY direction about the central axis CX of the drive shaft 14, which extends in the left-right direction. An eccentric sleeve 35 is fixed to the drive shaft 14. The eccentric sleeve 35 has a circular outer shape within a plane perpendicular to the central axis CX. The center of the eccentric sleeve 35 is offset from the central axis CX of the drive shaft 14.

[0080] The pump 30 is arranged further rearward than the eccentric sleeve 35. The movable member 32 is in contact with the outer surface of the eccentric sleeve 35. When the eccentric sleeve 35 rotates together with the drive shaft 14, the outer surface of the eccentric sleeve 35 approaches or separates from the front surface of the pump body 36. The outer surface of the eccentric sleeve 35 approaches the front surface of the pump body 36, thereby causing the movable member 32 in contact with the outer surface of the eccentric sleeve 35 to move rearward. In other words, the movable member 32 is pushed rearward by the eccentric sleeve 35. As the movable member 32 moves rearward, the lubricating oil is discharged from the joint 31.

[0081] The coil spring 34 generates a spring force that moves the movable member 32 forward. When the outer surface of the eccentric sleeve 35 separates from the front surface of the pump body 36, the plate 33 and the movable member 32 move forward due to the spring force of the coil spring 34. In other words, the plate 33, to which the movable member 32 is fixed, is pressed forward by the coil spring 34.

[0082] The movable member 32 reciprocates in the front-rear direction by the rotation of the eccentric sleeve 35 and the elastic force of the coil spring 34. As the movable member 32 reciprocates, the lubricating oil is intermittently discharged from the joint 31.

[0083] Figure 11 This is a diagram showing a portion of the sewing machine 1 according to the embodiment as viewed from the rear. Figure 12 It is a cross-sectional view showing a part of the sewing machine 1 according to the embodiment. Figure 13 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left front. Figure 14It is a perspective sectional view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left front. Figure 15 It is a cross-sectional view showing a part of the sewing machine 1 according to the embodiment. Figure 16 It is an exploded perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left front. Figure 12 Equivalent to Figure 11 AA line section view. Figure 14 Equivalent to Figure 13 A three-dimensional cross-sectional view of Figure 15 Equivalent to Figure 13 A side sectional view of Figure 16 Equivalent to Figure 13 Exploded perspective view with some components removed.

[0084] like Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 as well as Figure 16 As shown, the sewing machine 1 includes a driven shaft 16 , a conversion component 80 , a looper drive mechanism 21 , a looper 20 , and a transfer unit 60 .

[0085] The driven shaft 16 includes a right driven shaft 161 connected to the right end portion of the switching member 80 , and a left driven shaft 162 connected to the left end portion of the switching member 80 .

[0086] The conversion member 80 includes a right sleeve portion 81, into which the left end of the right driven shaft 161 is inserted; a left sleeve portion 82, into which the right end of the left driven shaft 162 is inserted; a spherical bearing 85 disposed between the right and left sleeve portions 81 and 82; a right flange portion 83 disposed between the right sleeve portion 81 and the spherical bearing 85; and a left flange portion 84 disposed between the left sleeve portion 82 and the spherical bearing 85. The right flange portion 83 is provided at the left end of the right sleeve portion 81. The left flange portion 84 is provided at the right end of the left sleeve portion 82. The spherical bearing 85 is disposed between the right and left flange portions 83 and 84. The right sleeve portion 81 is connected to the spherical bearing 85 via the right flange portion 83. The left sleeve portion 82 is connected to the spherical bearing 85 via the left flange portion 84.

[0087] The right driven shaft 161 is screwed to the right sleeve portion 81 while being inserted into the right sleeve portion 81. The left driven shaft 162 is screwed to the left sleeve portion 82 while being inserted into the left sleeve portion 82. As the driven shaft 16 rotates, the conversion member 80 rotates together with the driven shaft 16.

[0088] The spherical bearing 85 is an oil-supplied spherical sliding bearing. The driven shaft 16 rotates in the θY direction about the center axis DX of the driven shaft 16, which extends horizontally. The center of the spherical bearing 85 is offset from the center axis DX of the driven shaft 16. As the driven shaft 16 rotates about the center axis DX, the spherical bearing 85 oscillates vertically and longitudinally. The spherical bearing 85 converts the rotational motion of the driven shaft 16 about the center axis DX into oscillating motion in the vertical and longitudinal directions.

[0089] The looper drive mechanism 21 operates to rotate the looper 20 in the θX direction. The looper drive mechanism 21 includes a connecting rod 90 connected to the conversion member 80; a connecting member 22 connected to the connecting rod 90; a looper shaft 23 connected to the connecting member 22; and bearings 24 and 25 that rotatably support the looper shaft 23.

[0090] The connecting rod 90 includes a lower retaining portion 91 that holds the spherical bearing 85; an upper retaining portion 92 that holds the spherical portion 22A of the connecting member 22; and a rod portion 93 that connects the lower retaining portion 91 and the upper retaining portion 92. The lower retaining portion 91 is divisible. After the spherical bearing 85 is placed inside the divided lower retaining portion 91, the divided lower retaining portion 91 is integrated with a screw 94. Similarly, the upper retaining portion 92 is divisible. After the spherical portion 22A is placed inside the divided upper retaining portion 92, the divided upper retaining portion 92 is integrated with a screw 95.

[0091] The spherical bearing 85 has a spherical bearing surface 85S. The lower holding portion 91 has a sliding surface 91S facing the bearing surface 85S.

[0092] The connecting member 22 includes a spherical portion 22A held by the upper retaining portion 92 and a retaining portion 22B that holds the looper shaft 23. The retaining portion 22B is positioned to the right of the spherical portion 22A. The spherical portion 22A includes a spherical sliding surface 22S. The retaining portion 22B includes a retaining surface 92S that faces the sliding surface 22S. The connecting member 22 includes a retaining surface 22T that faces the outer surface of the looper shaft 23. The upper retaining portion 92 and the looper shaft 23 are fixed.

[0093] The looper shaft 23 is rotatably supported on the base member 13 via bearings 24 and 25. The looper shaft 23 extends in the front-to-back direction. The front end of the looper shaft 23 is fixed to the upper retaining portion 92 of the connecting member 22. The looper shaft 23 rotates in the θX direction about the center axis EX of the looper shaft 23. The center axis EX of the looper shaft 23 is parallel to the X-axis.

[0094] As the driven shaft 16 rotates, the spherical bearing 85 swings in the up-down direction and the front-back direction. As the spherical bearing 85 swings, the connecting rod 90 swings in the up-down direction. If the connecting rod 90 swings in the up-down direction, the spherical portion 22A swings in the up-down direction. If the spherical portion 22A swings in the up-down direction, the retaining portion 22B and the bending needle shaft 23 retained by the retaining portion 22B rotate. The bending needle shaft 23 reciprocates at a prescribed angle in the θX direction around the center axis EX of the bending needle shaft 23. As the bending needle shaft 23 reciprocates, the bending needle 20 fixed to the bending needle shaft 23 rotates in the θX direction.

[0095] like Figure 14 as well as Figure 15 As shown, the sewing machine 1 has an oil supply port 85C for supplying lubricating oil between the conversion member 80 and the connecting rod 90. The oil supply port 85C supplies lubricating oil between the bearing surface 85S of the spherical bearing 85 and the sliding surface 91S of the lower retaining portion 91. The oil supply port 85C is provided in the spherical bearing 85.

[0096] The lubricating oil is supplied from the intermediate portion 60 to the oil supply port 85C via the right driven shaft 161. Figure 12 As shown, the transfer part 60 has a retaining hole 63 in which a bearing 62 is arranged. The right driven shaft 161 is rotatably supported by the bearing 62. The transfer part 60 has a passage 60A communicating with the joint 61. The bearing 62 has a passage 62A communicating with the passage 60A. Figure 12 as well as Figure 15 As shown, the right driven shaft 161 has a hole 161A that can be connected to the passage 62A and a hollow hole 161B extending axially inside the right driven shaft 161. The hole 161A is connected to the right end of the hollow hole 161B. The left end of the hollow hole 161B is open.

[0097] Lubricating oil discharged from the joint 31 of the pump 30 is supplied to the joint 61 of the transfer unit 60 via the first tube 101. The lubricating oil that enters the joint 61 passes through passages 60A and 62A before flowing into hole 161A. Furthermore, as the right driven shaft 161 rotates, the lubricating oil that passes through passages 60A and 62A intermittently flows into hole 161A. The lubricating oil that flows into hole 161A flows into hollow hole 161B. The lubricating oil that is supplied from the pump 30 and flows into hollow hole 161B flows leftward within hollow hole 161B.

[0098] like Figure 15 As shown, the left end of the right driven shaft 161 is disposed in the internal space 81A of the right sleeve portion 81. The spherical bearing 85 has a passage 85A through which lubricating oil flows from the hollow hole 161B. The passage 85A is provided inside the spherical bearing 85. The passage 85A is connected to the internal space 81A.

[0099] Oil supply port 85C is provided on bearing surface 85S of spherical bearing 85. Internal space 81A is connected to oil supply port 85C via passage 85A. Lubricating oil supplied from hollow hole 161B into internal space 81A is supplied to oil supply port 85C via passage 85A. Oil supply port 85C supplies lubricating oil from passage 85A between bearing surface 85S of spherical bearing 85 and sliding surface 91S of lower retaining portion 91. The supply of lubricating oil from oil supply port 85C between bearing surface 85S of spherical bearing 85 and sliding surface 91S of lower retaining portion 91 allows lower retaining portion 91 to rotate smoothly relative to spherical bearing 85.

[0100] The first cover 40 is arranged to cover, from below, the conversion member 80 that couples the driven shaft 16 to the connecting rod 90 of the looper drive mechanism 21. The first cover 40 is arranged to cover, from below, at least the spherical bearing 85. The first cover 40 prevents the lubricating oil supplied from the oil supply port 85C between the bearing surface 85S and the sliding surface 91S from scattering around the conversion member 80.

[0101] In the axial direction of the driven shaft 16, that is, in the left-right direction, the first cover 40 is smaller than the driven shaft 16. In the embodiment, the size of the driven shaft 16 is the distance between the right end of the right driven shaft 161 and the left end of the left driven shaft 162.

[0102] The first cover 40 includes a front plate 40A, a rear plate 40B, a left plate 40C, a right plate 40D, and a bottom plate 40E. The rear plate 40B is positioned rearward of the front plate 40A. The left plate 40C is connected to the left end of the front plate 40A and the left end of the rear plate 40B. The right plate 40D is connected to the right end of the front plate 40A and the right end of the rear plate 40B. The bottom plate 40E is connected to the lower end of the front plate 40A, the lower end of the rear plate 40B, the lower end of the left plate 40C, and the lower end of the right plate 40D.

[0103] The front plate portion 40A is positioned forward of the driven shaft 16. The rear plate portion 40B is positioned rearward of the driven shaft 16. The upper end of the rear plate portion 40B is positioned above the upper end of the front plate portion 40A. At least a portion of the left driven shaft 162 is positioned to the left of the left plate portion 40C. At least a portion of the right driven shaft 161 is positioned to the right of the right plate portion 40D.

[0104] A recess 43 is provided on each of the left plate portion 40C and the right plate portion 40D. The recess 43 of the left plate portion 40C is recessed downward from the upper end of the left plate portion 40C. The recess 43 of the right plate portion 40D is recessed downward from the upper end of the right plate portion 40D. The driven shaft 16 and at least a portion of the conversion member 80 are disposed within the recess 43.

[0105] The left plate portion 40C is positioned to the right of the left end portion of the left driven shaft 162. The left plate portion 40C is positioned to the right of the left end portion of the conversion member 80. The left plate portion 40C is positioned to the left of the left flange portion 84. At least a portion of the left sleeve portion 82 is positioned in the recess 43 of the left plate portion 40C.

[0106] The right plate portion 40D is positioned to the left of the right end portion of the right driven shaft 161. The right plate portion 40D is positioned to the left of the right end portion of the conversion member 80. The right plate portion 40D is positioned to the right of the right flange portion 83. At least a portion of the right sleeve portion 81 is positioned in the recess 43 of the right plate portion 40D.

[0107] The left plate portion 40C is arranged to the left of the left flange portion 84. At least a portion of the left plate portion 40C faces the left flange portion 84. At least a portion of the right surface of the left plate portion 40C faces the left surface of the left flange portion 84.

[0108] The right plate portion 40D is arranged to the right of the right flange portion 83. At least a portion of the right plate portion 40D faces the right flange portion 83. At least a portion of the left surface of the right plate portion 40D faces the right surface of the right flange portion 83.

[0109] like Figure 9 As shown, the rear plate portion 40B is arranged in front of the looper 20 and the drive shaft 14. The upper end portion of the rear plate portion 40B is arranged below the looper shaft 23. Figure 4 As shown, the front plate portion 40A is arranged rearward of the front end portion of the base member 13. Alternatively, the front plate portion 40A may be arranged at the same position as the front end portion of the base member 13 in the front-rear direction.

[0110] The first cover 40 is fixed to the base member 13 via a fixing plate 70 . The fixing plate 70 is fixed to the lower surface of the bottom plate portion 40E of the first cover 40 by screws 42 .

[0111] The second cover 50 is configured to cover, from above, the conversion member 80 that couples the driven shaft 16 to the connecting rod 90 of the looper drive mechanism 21. The second cover 50 is configured to cover, from above, at least the spherical bearing 85. The second cover 50 prevents the lubricating oil supplied from the oil supply port 85C between the bearing surface 85S and the sliding surface 91S from scattering around the conversion member 80.

[0112] In the left-right direction, the first cover 40 is larger than the second cover 50. The left end of the first cover 40 is positioned to the left of the left end of the second cover 50. The right end of the first cover 40 is positioned to the right of the right end of the second cover 50. The front end of the second cover 50 is positioned slightly rearward of the front end of the first cover 40. The rear end of the second cover 50 is positioned slightly rearward of the rear end of the first cover 40.

[0113] The rear end portion 51 of the second cover 50 is fixed to the base member 13. A plurality of screw openings 51A are provided in the rear end portion 51. After being inserted into the screw openings 51A, the screws are inserted into the threaded holes provided in the base member 13.

[0114] The front end portion 52 (front end portion) of the second cover 50 is inclined downward toward the front. The front end portion 52 is provided so as to surround the conversion member 80.

[0115] A hole 53 is provided in the middle portion of the second cover 50. A portion of the upper retaining portion 92 of the connecting rod 90 is disposed in the hole 53. The upper retaining portion 92 is fixed to the second cover 50 while being disposed in the hole 53. The middle portion of the second cover 50 is fixed to the connecting rod 90.

[0116] The second cover 50 is flexible. It is made of rubber. When the connecting rod 90 moves vertically, the middle portion of the second cover 50 also moves vertically. Because the rear end portion 51 is fixed to the base member 13, vertical movement of the connecting rod 90 causes the second cover 50 to flex and deform, displacing the middle portion and front end portion 52 of the second cover 50 in the vertical direction.

[0117] The first cover 40 is separated from the driven shaft 16 and the conversion member 80. Since the first cover 40 is separated from the driven shaft 16 and the conversion member 80, the driven shaft 16 and the conversion member 80 can each rotate smoothly.

[0118] The second cover 50 is separated from the driven shaft 16 and the conversion member 80. Since the second cover 50 is separated from the driven shaft 16 and the conversion member 80, the driven shaft 16 and the conversion member 80 can each rotate smoothly.

[0119] The lubricating oil supplied from the oil supply port 85C between the bearing surface 85S and the sliding surface 91S falls into the first cover 40 due to gravity and is collected in the first cover 40. The lubricating oil scattered from between the bearing surface 85S and the sliding surface 91S is also collected in the first cover 40.

[0120] A joint 41 is provided on the bottom plate 40E of the first cover 40. Lubricating oil discharged from the first cover 40 flows through the joint 41. The joint 41 is connected to the joint 37 of the pump 30 via the second tube 102. The lubricating oil contained in the first cover 40 is sent to the pump 30 via the second tube 102.

[0121] In the embodiment, lubricating oil circulates in a circulation path including the pump 30 , the intermediate portion 60 , the driven shaft 16 , the conversion member 80 , the first cover 40 , and an oil tank (not shown).

[0122] Action

[0123] When the sewing machine motor 12 is driven, the needle bar 5 reciprocates vertically, the feed foot 10 moves along the feed track, the feed teeth 11 move along the feed track, and the looper 20 rotates in the θX direction. The needle bar 5 and the sewing needle 4 held by the needle bar 5 reciprocate vertically based on the power generated by the sewing machine motor 12. The looper 20 rotates in the θX direction in synchronization with the vertical reciprocating movement of the needle bar 5 to supply the bobbin thread to the sewing object. The feed foot 10 swings in the front-to-back direction and the vertical direction in synchronization with the vertical reciprocating movement of the needle bar 5 to feed the sewing object forward. The feed teeth 11 swings in the front-to-back direction and the vertical direction in synchronization with the vertical reciprocating movement of the needle bar 5 to feed the sewing object forward. The sewing machine 1 sews the sewing object through the cooperation between the sewing needle 4 held by the needle bar 5 and the looper 20.

[0124] When the drive shaft 14 rotates due to the power generated by the sewing machine motor 12, the eccentric sleeve 35 rotates. The movable member 32 of the pump 30 reciprocates in the front-to-back direction due to the rotation of the eccentric sleeve 35 and the elastic force of the coil spring 34. As the movable member 32 reciprocates, lubricating oil is intermittently discharged from the joint 31.

[0125] Lubricating oil discharged from the joint 31 of the pump 30 is supplied to the joint 61 of the intermediate unit 60 via the first tube 101. The lubricating oil flowing into the joint 61 passes through the passage 60A of the intermediate unit 60 and the passage 62A of the bearing 62 before flowing into the hole 161A of the right driven shaft 161. The lubricating oil flowing into the hole 161A flows into the hollow hole 161B of the right driven shaft 161. The lubricating oil flowing into the hollow hole 161B flows leftward within the hollow hole 161B.

[0126] Lubricating oil supplied from hollow hole 161B to interior space 81A of right sleeve portion 81 is supplied to oil supply port 85C via passage 85A of spherical bearing 85. Oil supply port 85C supplies lubricating oil between bearing surface 85S and sliding surface 91S. The supply of lubricating oil from oil supply port 85C between bearing surface 85S and sliding surface 91S allows lower retaining portion 91 to rotate smoothly relative to spherical bearing 85.

[0127] Lubricating oil supplied from oil supply port 85C between bearing surface 85S and sliding surface 91S is contained in first cover 40. Joint 41 of first cover 40 is connected to joint 37 of pump 30 via second tube 102. Lubricating oil contained in first cover 40 flows out of joint 41. Lubricating oil flowing out of joint 41 is delivered to pump 30 via second tube 102.

[0128] Effects

[0129] As described above, the sewing machine 1 of the embodiment includes: the sewing machine motor 12; the needle plate 7; the driven shaft 16, which is a lower shaft arranged below the needle plate 7 and rotated by the power generated by the sewing machine motor 12 and the rotational force of the drive shaft 14; the conversion member 80, which is fixed to the driven shaft 16 and converts the rotational motion of the driven shaft 16 into a swinging motion; the connecting rod 90, which is a holding member that holds at least a portion of the conversion member 80; the oil supply port 85C, which supplies lubricating oil between the conversion member 80 and the connecting rod 90; and the first cover 40, which is arranged around at least a portion of the conversion member 80. In the axial direction of the driven shaft 16, that is, in the left-right direction, the size of the first cover 40 is smaller than the size of the driven shaft 16.

[0130] According to the embodiment, the outer dimensions of the first cover 40, which contains lubricating oil, are smaller than those of the driven shaft 16. This prevents lubricating oil from adhering to unneeded areas of the sewing machine 1. If the first cover 40 were larger than the driven shaft 16, the lubricating oil contained in the first cover 40 could potentially adhere to unneeded areas. Examples of unneeded areas include the right end and middle portion of the right driven shaft 161 and the left end and middle portion of the left driven shaft 162. If lubricating oil adheres to unneeded areas, cleaning efforts may increase or the lubricating oil could accidentally adhere to sewing objects. Furthermore, if the first cover 40 is large and the opening at its upper end is large, there is a greater risk of foreign matter such as metal powder, thread waste, and dust entering the lubricating oil contained in the first cover 40 through the opening. According to the embodiment, the small size of the first cover 40 can prevent the occurrence of these undesirable situations. The conversion member 80 and the connecting rod 90 require lubricating oil because they move relative to each other. Since the first cover 40 is disposed around at least a portion of the switching member 80 where lubricating oil is required, the lubricating oil supplied from the oil supply port 85C between the switching member 80 and the connecting rod 90 can be prevented from scattering around the switching member 80 .

[0131] The sewing machine 1 includes a base member 13 that rotatably supports a driven shaft 16. The first cover 40 is fixed to the base member 13. Thus, the position of the first cover 40 is fixed to at least a portion of the periphery of the conversion member 80.

[0132] The first cover 40 covers at least a portion of the conversion member 80 from below. Thus, the lubricating oil supplied from the oil supply port 85C between the bearing surface 85S and the sliding surface 91S falls into the first cover 40 due to gravity and is stored in the first cover 40.

[0133] The conversion component 80 includes a spherical bearing 85. The connecting rod 90 has a sliding surface 91S that faces the bearing surface 85S of the spherical bearing 85. The center of the spherical bearing 85 is offset from the center axis DX of the driven shaft 16. An oil supply port 85C supplies lubricating oil between the bearing surface 85S and the sliding surface 91S. The first cover 40 covers the spherical bearing 85 from below. Because the center of the spherical bearing 85 is offset from the center axis DX of the driven shaft 16, the conversion component 80 can convert the rotational motion of the driven shaft 16 into the vertical swinging motion of the connecting rod 90. Since the bearing surface 85S of the spherical bearing 85 slides against the sliding surface 91S of the connecting rod 90, these areas require lubricating oil. Since the first cover 40 covers the spherical bearing 85, which requires lubricating oil, from below, the lubricating oil supplied between the spherical bearing 85 and the connecting rod 90 can be prevented from scattering around the spherical bearing 85.

[0134] The oil supply port 85C is provided in the spherical bearing 85. Thus, lubricating oil is supplied between the bearing surface 85S and the sliding surface 91S.

[0135] The sewing machine 1 includes a looper 20 for supplying a bobbin thread to a sewing object, and a looper drive mechanism 21 for rotating the looper 20. The looper drive mechanism 21 includes a connecting rod 90. Since the connecting rod 90 of the looper drive mechanism 21 slides smoothly relative to the spherical bearing 85, the looper drive mechanism 21 can operate smoothly.

[0136] The looper drive mechanism 21 includes a looper shaft 23, which secures the looper 20 and is connected to a connecting rod 90 via a connecting member 22. The connecting rod 90 includes a lower retaining portion 91 having a sliding surface 91S and an upper retaining portion 92 that retains the spherical portion 22A of the connecting member 22. This allows the looper 20, secured to the looper shaft 23, to rotate.

[0137] The first cover 40 has a recessed portion 43 in which at least a portion of the driven shaft 16 is positioned. The driven shaft 16 extends in the left-right direction. The first cover 40 includes a front plate portion 40A positioned forward of the driven shaft 16; a rear plate portion 40B positioned rearward of the driven shaft 16; a left plate portion 40C connected to the left end of the front plate portion 40A and the left end of the rear plate portion 40B; a right plate portion 40D connected to the right end of the front plate portion 40A and the right end of the rear plate portion 40B; and a bottom plate portion 40E connected to the lower end of the front plate portion 40A, the lower end of the rear plate portion 40B, the lower end of the left plate portion 40C, and the lower end of the right plate portion 40D. The recessed portion 43 is provided in each of the left plate portion 40C and the right plate portion 40D. Since at least a portion of the driven shaft 16 is positioned inside the recessed portion 43, the oil supply mechanism of the sewing machine 1 can be prevented from being oversized. Furthermore, since the first cover 40 is close to the spherical bearing 85 , scattering of the lubricating oil can be suppressed.

[0138] The driven shaft 16 includes a left driven shaft 162 and a right driven shaft 161. The left driven shaft 162 is at least partially located on the lower left side of the left plate portion 40C, while the right driven shaft 161 is at least partially located on the lower right side of the right plate portion 40D. The conversion member 80 includes a left sleeve portion 82 into which the left driven shaft 162 is inserted, and a right sleeve portion 81 into which the right driven shaft 161 is inserted. A spherical bearing 85 is disposed between the left sleeve portion 82 and the right sleeve portion 81. At least a portion of the left sleeve portion 82 is disposed in the recess 43 of the left plate portion 40C. At least a portion of the right sleeve portion 81 is disposed in the recess 43 of the right plate portion 40D. Since the left sleeve portion 82 and the right sleeve portion 81 each extend into the recess 43, the size of the oil supply mechanism of the sewing machine 1 can be suppressed. Furthermore, since the first cover 40 is close to the spherical bearing 85 , scattering of the lubricating oil can be suppressed.

[0139] The conversion member 80 includes a left flange portion 84 disposed between the left sleeve portion 82 and the spherical bearing 85, and a right flange portion 83 disposed between the right sleeve portion 81 and the spherical bearing 85. At least a portion of the left plate portion 40C faces the left flange portion 84, and at least a portion of the right plate portion 40D faces the right flange portion 83. Since at least a portion of the left plate portion 40C faces the left flange portion 84, and at least a portion of the right plate portion 40D faces the right flange portion 83, the size of the oil supply mechanism of the sewing machine 1 can be suppressed. Furthermore, since the gap between the conversion member 80 and the first cover 40 is reduced, scattering of lubricating oil can be suppressed.

[0140] The sewing machine 1 includes a pump 30 disposed outside the first cover 40 and discharging lubricating oil supplied to the oil supply port 85C. Since the pump 30 is disposed outside the first cover 40, an increase in size of the first cover 40 can be suppressed.

[0141] The driven shaft 16 has a hollow hole 161B through which lubricating oil supplied from the pump 30 flows. The conversion member 80 has a passage 85A through which the lubricating oil from the hollow hole 161B flows. An oil supply port 85C is provided in the conversion member 80. The oil supply port 85C supplies the lubricating oil from the passage 85A between the conversion member 80 and the connecting rod 90. This supplies the lubricating oil between the spherical bearing 85 and the lower retaining portion 91.

[0142] The lubricating oil stored in the first cover 40 is sent to the pump 30. This allows the lubricating oil to circulate.

[0143] The sewing machine 1 includes a second cover 50 connected to the connecting rod 90 and covering the spherical bearing 85 from above. Since the second cover 50 is arranged to cover the spherical bearing 85 from above, it is possible to suppress the lubricating oil supplied from the oil supply port 85C between the spherical bearing 85 and the lower retaining portion 91 from scattering around the spherical bearing 85.

[0144] In the left-right direction, the size of the first cover 40 is larger than the size of the second cover 50. This can prevent the oil supply mechanism of the sewing machine 1 from being enlarged.

[0145] The left end of the first cover 40 is arranged to the left of the left end of the second cover 50. The right end of the first cover 40 is arranged to the right of the right end of the second cover 50. This can prevent the oil supply mechanism of the sewing machine 1 from being enlarged.

[0146] Since the second cover 50 is disposed so as to surround the spherical bearing 85 , the lubricating oil supplied from the oil supply port 85C between the spherical bearing 85 and the lower retaining portion 91 can be prevented from scattering around the spherical bearing 85 .

[0147] The second cover 50 is made of rubber, so that the second cover 50 can bend and deform.

[0148] [Second embodiment]

[0149] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0150] Figure 17 4 is a cross-sectional view showing the first cover 40 according to the embodiment. Figure 17 As shown, a filter 45 may also be arranged on the inner side of the first cover 40. The lubricating oil after passing through the filter 45 is discharged from the joint 41 provided on the bottom plate portion 40E. Although the opening provided on the upper end portion of the first cover 40 is relatively small, foreign matter such as metal powder, thread ends, and dust may be mixed into the lubricating oil contained in the first cover 40. The filter 45 recovers foreign matter from the lubricating oil. Since the filter 45 recovers foreign matter, clean lubricating oil can be delivered from the joint 41 to the pump 30. Figure 17 As shown, the filter 45 may be disposed at a position separated from the bottom plate portion 40E of the first cover 40. When the filter 45 is in contact with the bottom surface of the first cover 40, there is a high probability that at least a portion of the foreign matter recovered in the filter 45 will move toward the joint 41. By disposing the filter 45 at a position separated from the bottom surface of the first cover 40, it is possible to suppress the foreign matter recovered in the filter 45 from moving toward the joint 41.

[0151] [Third embodiment]

[0152] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0153] Figure 18 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left rear side. Figure 19 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper right front. Figure 20 It is a perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left front. Figure 21 It is an exploded perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left front. Figure 22 It is a cross-sectional perspective view showing a part of the sewing machine 1 according to the embodiment, as seen from the upper left rear side.

[0154] The sewing machine 1 includes a drive shaft 14 , a driven shaft 16 , a looper 20 , a switching member 80 , a looper driving mechanism 21 , a first cover 340 , and a second cover 350 .

[0155] The looper 20 supplies the bobbin thread to the sewing object. The looper 20 is supported by a looper driving mechanism 21. Two loopers 20 are provided.

[0156] The conversion member 80 is fixed to the driven shaft 16. The conversion member 80 rotates together with the driven shaft 16. The conversion member 80 converts the rotational motion of the driven shaft 16 into a swinging motion. The conversion member 80 connects the driven shaft 16 and the looper drive mechanism 21.

[0157] The looper drive mechanism 21 operates to rotate the looper 20 in the θX direction based on the power generated by the sewing machine motor 12. The looper drive mechanism 21 is connected to the conversion member 80. The looper drive mechanism 21 operates when the conversion member 80 rotates.

[0158] The looper drive mechanism 21 includes a connecting rod 90 connected to the conversion member 80; a connecting member 22 connected to the connecting rod 90; and a looper shaft 23 connected to the connecting member 22. The connecting rod 90 holds at least a portion of the conversion member 80. The looper shaft 23 is connected to the connecting rod 90 via the connecting member 22. The looper shaft 23 is rotatably supported by bearings 24 and 25. The looper 20 is fixed to the looper shaft 23.

[0159] The first cover 340 is disposed around at least a portion of the conversion member 80. The first cover 340 covers at least a portion of the conversion member 80 from below. The first cover 340 covers the left portion of the drive shaft 14 and the left portion of the driven shaft 16 from below. The first cover 340 covers the coupling mechanism 300 that couples the drive shaft 14 to the looper shaft 23 from below. The first cover 340 prevents the lubricating oil supplied between the conversion member 80 and the connecting rod 90 from scattering.

[0160] The second cover 350 is disposed around at least a portion of the switching member 80. The second cover 350 covers at least a portion of the switching member 80 from above. The second cover 350 prevents scattering of lubricating oil supplied between the switching member 80 and the connecting rod 90. The second cover 350 is connected to the connecting rod 90.

[0161] The first cover 340 is arranged to cover from below the conversion member 80 that connects the driven shaft 16 and the connecting rod 90 of the looper drive mechanism 21. As described in the first embodiment, the conversion member 80 includes the spherical bearing 85. The first cover 340 is arranged to cover at least the spherical bearing 85 from below.

[0162] In the axial direction of the driven shaft 16, that is, in the left-right direction, the first cover 340 is smaller than the driven shaft 16. In the embodiment, the size of the driven shaft 16 is the distance between the right end of the right driven shaft 161 and the left end of the left driven shaft 162.

[0163] The first cover 340 includes a front plate portion 340A, a rear plate portion 340B, a left plate portion 340C, a right plate portion 340D, and a bottom plate portion 340E.

[0164] The front plate portion 340A is arranged in front of the driven shaft 16. The rear plate portion 40B is arranged in the rear of the drive shaft 14. The left plate portion 40C is arranged to the left of the conversion component 80 and the connecting mechanism 300. The left plate portion 40C is arranged to the right of the left end portion of the drive shaft 14 and the left end portion of the driven shaft 16. A pulley portion 14A is provided at the left end portion of the drive shaft 14, on which the supply belt 15 is hung. A pulley portion 16A is provided at the left end portion of the driven shaft 16, on which the supply belt 15 is hung. The left plate portion 40C is arranged to the right of the pulley portion 14A and the pulley portion 16A. The right plate portion 340D is arranged to the right of the conversion component 80 and the connecting mechanism 300.

[0165] The second cover 350 is arranged to cover, from above, the conversion member 80 that couples the driven shaft 16 and the connecting rod 90 of the looper drive mechanism 21. The second cover 350 is arranged to cover at least the spherical bearing 85 from above.

[0166] In the left-right direction, the first cover 340 is larger than the second cover 350. The left end of the first cover 340 is positioned to the left of the left end of the second cover 350. The right end of the first cover 340 is positioned to the right of the right end of the second cover 350. The front end of the second cover 350 is positioned rearward of the front end of the first cover 340. The rear end of the second cover 350 is positioned forward of the rear end of the first cover 340.

[0167] The rear end of the second cover 350 is tilted downward and faces rearward. The rear end of the second cover 350 is configured to enclose the conversion component 80. The front end of the second cover 350 is tilted downward and faces forward. The front end of the second cover 350 is configured to enclose the conversion component 80. The middle portion of the second cover 350 is fixed to the connecting rod 90 by screws 351.

[0168] The second cover 350 is flexible. It is made of rubber. When the connecting rod 90 moves vertically, the middle portion of the second cover 350 also moves vertically. Because the middle portion of the second cover 350 is secured to the connecting rod 90 by screws 351, vertical movement of the connecting rod 90 causes the second cover 350 to flex and deform, causing the front and rear ends of the second cover 350 to displace vertically.

[0169] The first cover 340 is separated from each of the drive shaft 14, the driven shaft 16, the conversion member 80, and the coupling mechanism 300. Since the first cover 340 is separated from each of the drive shaft 14, the driven shaft 16, the conversion member 80, and the coupling mechanism 300, each of the drive shaft 14, the driven shaft 16, the conversion member 80, and the coupling mechanism 300 can rotate smoothly.

[0170] The second cover 350 is separated from each of the drive shaft 14, the driven shaft 16, the conversion member 80, and the coupling mechanism 300. Since the second cover 350 is separated from each of the drive shaft 14, the driven shaft 16, the conversion member 80, and the coupling mechanism 300, each of the drive shaft 14, the driven shaft 16, the conversion member 80, and the coupling mechanism 300 can rotate smoothly.

[0171] The lubricating oil supplied between the switching member 80 and the connecting rod 90 falls into the first cover 340 due to gravity and is collected in the first cover 340. The lubricating oil scattered from between the switching member 80 and the connecting rod 90 is also collected in the first cover 340.

[0172] A reflux member 360 is provided on the bottom plate 340E of the first cover 340. Lubricating oil discharged from the first cover 340 flows through the reflux member 360. The reflux member 360 includes a filter. The reflux member 360 is connected to the joint 37 of the pump 30 via the second pipe 102 described in the first embodiment. The lubricating oil discharged from the first cover 340 via the reflux member 360 is delivered to the pump 30 via the second pipe 102.

[0173] [Other Implementation Methods]

[0174] In the above embodiment, the conversion member 80 includes the right sleeve portion 81, the left sleeve portion 82, the right flange portion 83, the left flange portion 84, and the spherical bearing 85. However, in the conversion member 80, for example, the left sleeve portion 82 may be omitted. In the conversion member 80, for example, the left sleeve portion 82 and the left flange portion 84 may also be omitted. In the case of omitting the left sleeve portion 82, the recess 43 may be provided in the right plate portion 40D, while the recess 43 may not be provided in the left plate portion 40C.

Claims

1. A sewing machine comprising: sewing machine motors; needle plate; a lower shaft disposed below the needle plate and rotated by power generated by the sewing machine motor; a conversion component fixed to the lower shaft and converting the rotational motion of the lower shaft into a swinging motion; a holding member that holds at least a portion of the conversion member; an oil supply port for supplying lubricating oil between the conversion member and the retaining member; and a first cover disposed around at least a portion of the conversion member; In the axial direction of the lower shaft, the first cover has a smaller size than the lower shaft.

2. The sewing machine according to claim 1, characterized in that A base member is provided for rotatably supporting the lower shaft. The first cover is fixed to the base member.

3. The sewing machine according to claim 1, wherein The first cover covers at least a portion of the conversion member from below.

4. The sewing machine according to claim 3, characterized in that The conversion component has a spherical bearing, The holding member has a sliding surface facing the bearing surface of the spherical bearing. The center of the spherical bearing is arranged at a position offset from the central axis of the lower shaft. The oil supply port supplies lubricating oil between the bearing surface and the sliding surface. The first cover covers the spherical bearing from below.

5. The sewing machine according to claim 4, characterized in that The oil supply port is provided on the spherical bearing.

6. The sewing machine according to claim 4, characterized in that have: a looper that supplies a lower thread to an object to be sewn; and a looper drive mechanism that operates in such a way as to cause the looper to rotate, The bending needle driving mechanism includes the retaining component.

7. The sewing machine according to claim 6, characterized in that The looper drive mechanism comprises: connecting rods; and A looper shaft, for fixing the looper and connected to the connecting rod via a connecting component, The connecting rod has: a lower retaining portion having the sliding surface; and The upper holding portion holds the spherical portion of the connecting member.

8. The sewing machine according to claim 7, characterized in that The first cover has a recessed portion in which at least a portion of the lower shaft is disposed.

9. The sewing machine according to claim 8, characterized in that The conversion component has a sleeve portion, which is connected to the spherical bearing and into which the lower shaft is inserted. At least a portion of the sleeve portion is disposed in the recessed portion.

10. The sewing machine according to claim 8, characterized in that The lower shaft extends in the left-right direction, The first cover has: a front plate portion, disposed forward of the lower shaft; a rear plate portion, which is arranged behind the lower shaft; a left plate portion connected to a left end portion of the front plate portion and a left end portion of the rear plate portion; a right plate portion connected to a right end portion of the front plate portion and a right end portion of the rear plate portion; and a bottom plate portion connected to the lower end portion of the front plate portion, the lower end portion of the rear plate portion, the lower end portion of the left plate portion, and the lower end portion of the right plate portion, The recessed portion is provided on each of the left plate portion and the right plate portion.

11. The sewing machine according to claim 10, characterized in that The lower shaft comprises: a left lower shaft, at least a portion of which is disposed to the left of the left plate portion; and a right lower shaft, at least a portion of which is arranged to the right of the right plate portion; The conversion component has: a left sleeve portion for inserting the left lower shaft; and a right sleeve portion for inserting the right lower shaft; The spherical bearing is arranged between the left sleeve portion and the right sleeve portion. At least a portion of the left sleeve portion is disposed in the recessed portion of the left plate portion. At least a portion of the right sleeve portion is disposed in the recessed portion of the right plate portion.

12. The sewing machine according to claim 11, characterized in that The conversion component has: a left flange portion disposed between the left sleeve portion and the spherical bearing; and a right flange portion, which is arranged between the right sleeve portion and the spherical bearing, At least a portion of the left plate portion is opposed to the left flange portion, At least a portion of the right plate portion faces the right flange portion.

13. The sewing machine according to claim 1, wherein A pump is provided that is arranged outside the first cover and discharges the lubricating oil supplied to the oil supply port.

14. The sewing machine according to claim 13, characterized in that The lower shaft has a hollow hole through which lubricating oil supplied from the pump flows. The conversion member has a passage for the lubricating oil from the hollow hole to flow. The oil supply port is provided in the switching member and supplies lubricating oil from the passage to between the switching member and the retaining member.

15. The sewing machine according to claim 14, characterized in that The lubricating oil contained in the first cover is sent to the pump.

16. The sewing machine according to claim 15, characterized in that have: a joint provided on the bottom plate portion of the first cover and through which lubricating oil discharged from the first cover flows; and a filter element, which is arranged on the inner side of the first cover, The filter is disposed at a position separated from the bottom plate.

17. The sewing machine according to claim 10, characterized in that A second cover is provided, the second cover being connected to the connecting rod and covering the spherical bearing from above.

18. The sewing machine according to claim 17, characterized in that In the left-right direction, the size of the first cover is larger than the size of the second cover.

19. The sewing machine according to claim 18, characterized in that The left end portion of the first cover is arranged to the left of the left end portion of the second cover, and the right end portion of the first cover is arranged to the right of the right end portion of the second cover.

20. The sewing machine according to claim 18, wherein The front end portion of the second cover is inclined downward toward the front.

21. The sewing machine according to claim 17, wherein The second cover is fixed to the connecting rod.

22. The sewing machine according to claim 21, characterized in that The second cover is made of rubber.

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