Sewing machine

Abstract

Provided is a sewing machine capable of being downsized in the axial direction of a shuttle shaft. A shuttle mechanism is moved in the left-right direction by a moving mechanism via a shuttle shaft (37). A transmission mechanism (21) has a pulley (22) and a spline nut (34). The pulley is formed with a hole (26). The spline nut is entirely embedded in the hole (26). A through hole (35) is formed in the center of the bottom surface of the spline nut. An inner tooth (36) is formed on the inner peripheral surface defined by the through hole (35) in a direction parallel to the left-right direction. An outer tooth (38) is formed on the side surface of the shuttle shaft (37) in a direction parallel to the left-right direction. The outer tooth (38) is engaged with the inner tooth (36). By driving of a sewing machine motor, the pulley (22), the spline nut (34), and the shuttle shaft (37) rotate as a unit around the axis. When the shuttle shaft (37) is moved in the left-right direction by the moving mechanism, the outer tooth (38) is guided by the inner tooth (36).

Description

TECHNICAL FIELD

[0001] The present application relates to a sewing machine. BACKGROUND

[0002] Conventionally, a sewing machine that moves a rotating hook in a horizontal direction to make a gap between a needle and a hook point of the rotating hook appropriate is known. The rotating hook moving adjustment device of the sewing machine described in Patent Document 1 has a step motor and an eccentric pin mechanism. If the step motor is driven, the rotational drive of the step motor is converted into drive in the front-rear direction by the eccentric pin mechanism. The eccentric pin mechanism engages with a bush. The bush pivotally supports a hook shaft of the rotating hook. The rotating hook is moved in the front-rear direction by the bush by driving of the rotating hook moving adjustment device.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 11-226285 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a sewing machine, a hook shaft of a rotating hook is rotated around an axis in order for the rotating hook to catch a thread loop. The sewing machine has a transmission mechanism that transmits an external force for rotating the hook shaft. The bush that transmits the external force and transmits drive of the step motor of the rotating hook moving adjustment device is provided to the hook shaft. Thus, the hook shaft is long in the axis direction, and there is a possibility that the sewing machine is large-sized.

[0008] An object of the present application is to provide a sewing machine that can be small-sized in the axis direction of the hook shaft.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The sewing machine of one aspect of the present application is characterized by comprising: a hook mechanism that catches a thread passing through a needle that moves up and down and interlaces the thread with a base thread; a hook shaft that extends in an axis direction that intersects with the up-down direction, is rotatable around a shaft that is parallel to the axis direction, and supports the hook mechanism; external teeth that are formed in the hook shaft and are formed in a direction that is parallel to the axis direction; a moving mechanism that moves the hook mechanism in the axis direction via the hook shaft; a spline nut into which the hook shaft is inserted, has internal teeth that engage with the external teeth in an inner peripheral surface, and is provided with a hole portion that is open in the axis direction; and a rotating body that is rotatable around the shaft in a manner that transmits an external force, and at least a part of the spline nut is embedded in the hole portion.

[0011] In the sewing machine, the shuttle shaft is rotated around the axis parallel to the axial direction via the spline nut by the rotation of the rotating body. In addition, when the shuttle mechanism is moved in the axial direction by the moving mechanism via the shuttle shaft, the spline nut guides the shuttle shaft in the axial direction with the internal teeth. At least a part of the spline nut is buried in the hole portion of the rotating body. Thus, the sewing machine can be miniaturized in the axial direction while having the mechanism that rotates the shuttle shaft around the axis parallel to the axial direction and the moving mechanism that moves the shuttle shaft in the axial direction.

[0012] The moving mechanism can include an electric motor and a brake mechanism that restrains rotation of a rotating shaft of the electric motor when the electric motor is not energized. In the sewing machine, the brake mechanism restrains rotation of the rotating shaft of the electric motor when the electric motor is not energized, and thus movement of the shuttle mechanism in the axial direction by the moving mechanism is restrained. Thus, the sewing machine can simply restrain movement of the shuttle mechanism in the axial direction by not energizing the electric motor when the shuttle mechanism is not moved by the moving mechanism.

[0013] The moving mechanism can include an electric motor and a cam that rotates by driving of the electric motor and has a second hole portion that opens in a second intersecting direction intersecting the axial direction. Since the moving mechanism includes the cam, the rotating shaft of the electric motor is less likely to rotate when the shuttle mechanism is not moved by the moving mechanism than when the moving mechanism does not include the cam. Thus, the sewing machine can reduce a load applied to the rotating shaft of the electric motor when the shuttle mechanism is not moved by the moving mechanism.

[0014] The moving mechanism can include an electric motor, a first link member that swings by driving of the electric motor, a second link member that swings by swinging of the first link member, and an eccentric pin that links the first link member and the second link member. In the sewing machine, the first link member and the second link member are linked by the eccentric pin. By rotating the eccentric pin, a position of a fulcrum at which the second link member swings with respect to the first link member can be adjusted. Thus, the sewing machine can adjust movement of the shuttle mechanism in the axial direction by the moving mechanism with a simple structure.

[0015] The moving mechanism can include an electric motor, a locking portion that is locked to the shuttle shaft, a cross-engagement portion that is formed in the locking portion and extends in a cross direction that intersects the axial direction, and a cross-locked portion that is guided by the cross-engagement portion to move in the cross direction by driving of the electric motor, and the driving force of the electric motor is transmitted to the locking portion in the axial direction. In the sewing machine, the rotational motion of the rotational shaft of the electric motor is converted into the axial direction by the cross-engagement portion guiding the cross-locked portion to move. The shuttle shaft moves in the axial direction via the locking portion by driving of the electric motor. Thus, the sewing machine can move the shuttle shaft in the axial direction with a simple structure.

[0016] The moving mechanism can include a bearing portion that supports the shuttle shaft so as to be rotatable about the shaft, and an axial engagement portion that extends from the bearing portion in the axial direction, and an axial-locked portion that has one end fixed relative to a frame of the sewing machine, extends toward the axial engagement portion, and has the other end engaged with the axial engagement portion. The bearing portion can slightly rotate about the shaft that is parallel to the axial direction by friction with the shuttle shaft. In the sewing machine, the rotation of the bearing portion about the shaft that is parallel to the axial direction is suppressed by engagement of the axial engagement portion and the axial-locked portion having one end fixed to the frame of the sewing machine. Thus, the sewing machine can suppress rotation of the bearing portion about the shaft that is parallel to the axial direction with a simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the sewing machine 1 on the table 100.

[0018] Figure 2 is a perspective view of the shuttle housing portion 10.

[0019] Figure 3 is a perspective view of the shuttle mechanism 18, the shuttle support portion 20, and the moving mechanism 60.

[0020] Figure 4 is a plan view of the shuttle mechanism 18, the shuttle support portion 20, and the moving mechanism 60.

[0021] Figure 5 is a cross-sectional view when viewed from the A-A line in the arrow direction. Figure 4

[0022] Figure 6 is an exploded perspective view of the shuttle mechanism 18, the shuttle support portion 20, and the block member 83.

[0023] Figure 7 is an exploded perspective view of the transmission mechanism 21 and the shuttle shaft 37.

[0024] Figure 8 is a perspective view of the block member 83.​

[0025] Figure 9 This is an exploded perspective view of the moving mechanism 60.

[0026] Figure 10 This is a 3D view of the moving mechanism 60.

[0027] Figure 11 This is a bottom view of the slotted cam 51.

[0028] Figure 12 It is a 3D diagram of eccentric pin 72.

[0029] Figure 13 This is a top view of the eccentric pin 72.

[0030] Figure 14 This is a top view of the ball-and-sole 91.

[0031] Figure 15 Viewed from the direction of the arrow Figure 14 A sectional view along the BB line. Detailed Implementation

[0032] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, left and right, front and back, and up and down are indicated by arrows in the drawings.

[0033] Sewing machine 1 is a gate-type sewing machine capable of sewing relative to the workpiece. For example... Figure 1 As shown, the sewing machine 1 has a base section 2, a pair of support sections 3 and 4, a conveying mechanism (not shown), a holding mechanism 8, a beam section 5, a needle bar mechanism 106, and a shuttle receiving section 10.

[0034] The base portion 2 has a base 121, a pair of front and rear rails, and a frame 122. The base 121 is generally rectangular. A horizontally extending, flat retaining surface 121A is formed on the upper surface of the base 121. A retaining plate 123 extending forward along the retaining surface 121A is provided at the front end of the base 121. A snake-belly 121R extending in the front-rear direction is provided near the right end of the retaining surface 121A. A snake-belly 121L extending in the front-rear direction is provided near the left end of the retaining surface 121A. A pair of front and rear rails are provided below the snake-belly 121L and 121R. The front and rear rails support the retaining mechanism 8 (described later) so that it can move in the front-rear direction. The snake-belly 121R and 121L extend and retract according to the reciprocating movement of the retaining mechanism 8 in the front-rear direction. The frame 122 is a lattice-shaped structure that supports the base 121 from below. The base section 2 has a lower rail (not shown) and a shuttle housing section 10 (described later) disposed below the base section 121. The lower rail extends in the left-right direction and supports the shuttle housing section 10 so that it can move in the left-right direction.

[0035] The pair of support sections 3 and 4 are approximately quadrangular prisms. Support section 4 extends upward from the right end of the base section 121 of the base section 2, slightly forward and forward of the center in the front-rear direction. Support section 4 is located to the right of the snake belly 121R in the left-right direction. Support section 3 extends upward from the left end of the base section 121 of the base section 2, slightly forward and forward of the center in the front-rear direction. Support section 3 is located to the left of the snake belly 121L in the left-right direction. Support sections 3 and 4 are separated in the left-right direction.

[0036] A beam 5 is mounted between the support sections 3 and 4. The beam 5 extends in the left-right direction throughout the entire area between the pair of support sections 3 and 4. The beam 5 has a housing 151. The housing 151 extends between the upper and rear ends of each of the support sections 3 and 4. An upper rail is provided in the space surrounded by the support sections 3 and 4 and the housing 151. The upper rail is mounted between the support sections 3 and 4. The upper rail supports the needle bar mechanism 106 so that it can move in the left-right direction. A serpentine 152 is provided at the front ends of each of the support sections 3 and 4 and the housing 151, as well as at both ends of the needle bar mechanism 106 (described later). The serpentine 152 covers the front side of the upper rail.

[0037] The needle bar mechanism 106 is positioned at the front relative to the beam portion 5. The needle bar mechanism 106 includes a needle bar (not shown). The needle bar extends vertically and is capable of assembling a machine needle. The needle bar is movable vertically. The needle bar mechanism 106 is movable horizontally along the front end of the beam portion 5, following an upper rail within the beam portion 5. The caliper 152 extends and retracts according to the reciprocating horizontal movement of the needle bar mechanism 106 along the upper rail.

[0038] The conveying mechanism causes the holding mechanism 8, which holds the workpiece, to move back and forth relative to the needle bar mechanism 106 and the shuttle receiving part 10. The conveying mechanism includes connecting parts 211 and 212. The lower left end of the connecting part 211 is disposed on the front and rear rails located on the left side of the machine base 2. The lower right end of the connecting part 212 is disposed on the front and rear rails located on the right side of the machine base 2. The connecting parts 211 and 212 are connected to the holding mechanism 8. The holding mechanism 8 is capable of holding the workpiece. The holding mechanism 8 has an upper frame 181, a lower frame 182, and cylinders 183 and 184. The upper frame 181 and the lower frame 182 are rectangular frames in plan view, and the workpiece is held between them. The upper frame 181 is opened and closed up and down relative to the lower frame 182 by the cylinders 183 and 184 as the driving source.

[0039] like Figure 2 As shown, the shuttle housing 10 includes a lower frame 11, a sewing machine motor 6, a shuttle support 20, a shuttle mechanism 18, and a moving mechanism 60. The lower frame 11 is box-shaped and houses the shuttle support 20, the shuttle mechanism 18, and the moving mechanism 60.

[0040] A sewing machine motor 6 is provided at a lower end of the shuttle housing portion 10. A rotation shaft of the sewing machine motor 6 extends in the left-right direction. A connecting pulley 12 is provided at a right side of the sewing machine motor 6. The rotation shaft of the sewing machine motor 6 is fixed to the connecting pulley 12.

[0041] The connecting pulley 12 has pulleys 14, 15. The pulleys 14, 15 are cylindrical. Axial centers of the pulleys 14, 15 extend in parallel to the left-right direction. The axial centers of the pulleys 14, 15 coincide with each other. A diameter of a bottom surface of the pulley 14 is larger than a diameter of a bottom surface of the pulley 15. The pulley 15 is connected to a right end of the pulley 14. A looped belt 16 is provided on the pulley 14. The looped belt 16 is also provided on a pulley 22 (refer to Figure 3 ) of a later-described shuttle support portion 20. A looped belt (not shown) is provided on the pulley 15. The looped belt provided on the pulley 15 is also provided on a pulley fixed to the upper shaft. The looped belt is driven by rotation of the pulley 15, so that the upper shaft rotates. The needle bar and the needle are moved up and down by rotation of the upper shaft.

[0042] The configuration of the shuttle support portion 20 will be described with reference to Figures 3 to 7 . A left end of the shuttle support portion 20 supports the shuttle mechanism 18. The shuttle support portion 20 has a transmission mechanism 21, shuttle shafts 37, 47 (refer to Figure 6 ), and a connecting clamp 39. As shown in Figure 5 , Figure 7 , the transmission mechanism 21 has the pulley 22, a spline nut 34, and shaft support members 30, 32.

[0043] The pulley 22 has cylinders 23, 24, 25. Axial centers of the cylinders 23, 24, 25 extend in parallel to the left-right direction. The axial centers of the cylinders 23, 24, 25 coincide with each other. A diameter of a bottom surface of the cylinder 23 is larger than a diameter of a bottom surface of the cylinder 24. A diameter of a bottom surface of the cylinder 24 is larger than a diameter of a bottom surface of the cylinder 25. The cylinder 23 is connected to a right end of the cylinder 25. The cylinder 24 is connected to a right end of the cylinder 23.

[0044] An external tooth 28 is formed on a side surface of the cylinder 23 in a direction parallel to the left-right direction. Although omitted in Figures 3 to 7 , the looped belt 16 is provided on the external tooth 28 as shown in Figure 2 . The belt is driven by rotation of the pulley 14, so that the pulley 22 rotates around the axial centers of the cylinders 23, 24, 25.

[0045] A hole 26 recessed to the left is formed in a center of a right surface of the cylinder 24. The hole 26 is recessed from the right surface of the cylinder 24 to a left end portion of the cylinder 23. A hole 27 recessed to the right is formed in a center of a left surface of the cylinder 25 (refer to Figure 5). The hole 27 is recessed from the left surface of the cylinder 25 to the left end of the cylinder 23. The diameter of the hole 27 is smaller than the diameter of the hole 26 and is the same size as the diameter of the shuttle shaft 37. The holes 26, 27 communicate at the left end of the cylinder 23.

[0046] As shown in Figure 7 , the spline nut 34 is cylindrical. The axis of the spline nut 34 extends in parallel with the left-right direction. The axis of the spline nut 34 coincides with the axis of the pulley 22. The diameter of the bottom surface of the spline nut 34 is the same size as the diameter of the hole 26. The spline nut 34 is entirely embedded in the hole 26. A through hole 35 that penetrates the spline nut 34 in the left-right direction is formed in the center of the bottom surface of the spline nut 34. An internal tooth 36 is formed on the inner peripheral surface of the spline nut 34 defined by the through hole 35 in a direction parallel with the left-right direction.

[0047] The shaft support members 30, 32 are cylindrical. The axes of the shaft support members 30, 32 extend in parallel with the left-right direction. The axes of the shaft support members 30, 32 coincide with the axis of the pulley 22. The diameters of the shaft support members 30, 32 are the same size as the diameter of the cylinder 23. The shaft support member 30 is inserted into a through hole (not shown) formed in the lower frame 11 and penetrating the lower frame 11 in the left-right direction. The shaft support member 32 is inserted into a through hole 110 (refer to FIG. 2) formed in the lower frame 11 and penetrating the lower frame 11 in the left-right direction. The shaft support members 30, 32 are rotatable with the lower frame 11 as a sliding bearing. Figure 2

[0048] A through hole 31 that penetrates the shaft support member 30 in the left-right direction is formed in the center of the bottom surface of the shaft support member 30. The diameter of the through hole 31 is the same size as the diameter of the cylinder 24. The cylinder 24 is inserted into the through hole 31. A through hole 33 that penetrates the shaft support member 32 in the left-right direction is formed in the center of the bottom surface of the shaft support member 32. The diameter of the through hole 33 is the same size as the diameter of the cylinder 25. The cylinder 25 is inserted into the through hole 33. By the driving of the sewing machine motor 6, the pulley 22, the spline nut 34, and the shaft support members 30, 32 rotate around the axis in the transmission mechanism 21 in an integrated manner.

[0049] As shown in Figures 5 to 7 , the axis of the shuttle shaft 37 extends in parallel with the left-right direction. An external tooth 38 is formed on the side surface of the shuttle shaft 37 in a direction parallel with the left-right direction. The shuttle shaft 37 sequentially inserts the through hole 35, the through hole 33, a clamping member 42, and a block member 83 described later from the right. The clamping member 42 is fixed to the shuttle shaft 37 to the left of the cylinder 25.

[0050] ​The outer teeth 38 of the shuttle shaft 37 engage with the inner teeth 36 of the through-hole 35. If the transmission mechanism 21 is rotated by the drive of the sewing machine motor 6, the shuttle shaft 37 rotates around the shaft center in a manner integrated with the transmission mechanism 21. The outer teeth 38 of the shuttle shaft 37 are guided by the inner teeth 36 of the through-hole 35 so that the shuttle shaft 37 can move in the left-right direction.

[0051] As shown in Figure 5 , the left end of the shuttle shaft 37 is fixedly connected to the link 39. The link 39 has clamping pieces 40, 41. The clamping piece 40 is connected to the right end of the clamping piece 41. The left end of the shuttle shaft 37 is fixed by the clamping piece 40 of the link 39.

[0052] As shown in Figure 5 , Figure 6 , the shaft center of the shuttle shaft 47 extends in parallel with the left-right direction. The shaft centers of the shuttle shafts 37, 47 coincide. The right end of the shuttle shaft 47 is fixed by the clamping piece 41 of the link 39. A hole 48 recessed to the right is formed in the center of the left surface of the shuttle shaft 47.

[0053] The shuttle shaft 47 inserts the shaft support member 43. The shaft support member 43 is cylindrical. The shaft center of the shaft support member 43 extends in parallel with the left-right direction. The shaft center of the shaft support member 43 coincides with the shaft center of the shuttle shaft 47. The shaft support member 43 is inserted into the through-hole 111 (refer to Figure 2 ) formed in the lower frame 11 and passing through the lower frame 11 in the left-right direction. A through-hole 44 passing through the shaft support member 43 in the left-right direction is formed in the center of the bottom surface of the shaft support member 43. The diameter of the through-hole 44 is the same size as the diameter of the shuttle shaft 47. The shuttle shaft 47 inserts the through-hole 44 of the shaft support member 43. The shaft support member 43 is fixed to the shuttle shaft 47. The shaft support member 43 can rotate in a manner integrated with the shuttle shaft 47 with the lower frame 11 as a sliding bearing.

[0054] The right end of the shuttle mechanism 18 is connected to the shaft 19. The shaft 19 extends in the left-right direction. The shaft 19 is buried in the hole 48 (refer to Figure 5 ) of the shuttle shaft 47. By the rotation of the transmission mechanism 21, the shuttle mechanism 18 rotates around the shaft center via the shuttle shafts 37, 47. The shuttle mechanism 18 captures the thread loop of the thread inserted into the needle below the needle plate 13. Thus, the sewing machine 1 forms stitches on the cloth placed on the needle plate 13.

[0055] Refer to Figure 3 , Figure 4 , Figures 8 to 13, which illustrates the configuration of the moving mechanism 60. The moving mechanism 60 moves the shuttle mechanism 18 in the left-right direction via the shuttle shaft 37. The moving mechanism 60 adjusts the position of the shuttle mechanism 18 in the left-right direction with respect to the needle that has passed through the needle hole. The moving mechanism 60 is provided with a step motor 50, a slot cam 51, a fulcrum pin 61, a shoulder bolt 65, link members 68, 71, 77, an eccentric pin 72, a square slide 81, and a block member 83.

[0056] The step motor 50 is disposed behind the shuttle mechanism 18 (refer to Figure 4 ). The step motor 50 is built-in with an electromagnetic brake that operates when there is no power supply. As shown in Figure 9 , the rotation shaft 50A of the step motor 50 extends in the up-down direction. The rotation shaft 50A is inhibited from rotating around the shaft by the electromagnetic brake when there is no power supply. The slot cam 51 is disposed above the step motor 50. The rotation shaft 50A of the step motor 50 is fixed to the slot cam 51.

[0057] As shown in Figure 11 , the slot cam 51 has a circular plate 52. The axis of the circular plate 52 extends in parallel with the up-down direction. An annular slot 54 that is recessed upward is formed in the bottom surface of the circular plate 52. A cylindrical pin 55 is disposed protruding downward at the center of a central portion 53 defined inside the slot 54 in the circular plate 52. The axis of the cylindrical pin 55 extends in parallel with the up-down direction. The axis of the cylindrical pin 55 coincides with the axis of the circular plate 52. A hole 55A that is recessed upward is formed in the bottom surface of the cylindrical pin 55. The rotation shaft 50A of the step motor 50 is embedded in the hole 55A (refer to Figure 9 ). The slot cam 51 rotates around the axis by the drive of the step motor 50.

[0058] As shown in Figure 4 , Figure 9 , the fulcrum pin 61 is disposed behind the shuttle mechanism 18 and in front of the slot cam 51. The fulcrum pin 61 is provided with a fixed cylinder 62 and a cantilever pin 63. The fixed cylinder 62 is cylindrical. One end of the cantilever pin 63 is fixed to the fixed cylinder 62. The shoulder bolt 65 is disposed in front of the right of the fulcrum pin 61 and behind the shuttle support portion 20. More specifically, the shoulder bolt 65 is disposed behind the block member 83 through which the shuttle shaft 37 is inserted.

[0059] As shown in Figure 9 , Figure 10As shown, the connecting rod member 68 is a rod-shaped member extending horizontally from the fulcrum pin 61 toward the slotted cam 51. A through hole 68A extending vertically is formed at the end of the connecting rod member 68 on the fulcrum pin 61 side. A cantilever pin 63 is inserted through the through hole 68A. The cantilever pin 63 is fixed to the lower frame 11 below the connecting rod member 68. The connecting rod member 68 is configured to swing about the fulcrum pin 61. A through hole 68B extending vertically is formed at the end of the connecting rod member 68 on the slotted cam 51 side. A pin 70 extending vertically is inserted through the through hole 68B. The connecting rod member 68 fixes the lower end of the pin 70.

[0060] The connecting rod member 71 is a rod-shaped member extending forward and to the right from the slotted cam 51. In the left-right direction, a through hole 71A is formed at the left end (slotted cam 51 side) of the connecting rod member 71, extending vertically. A through pin 70 is inserted above the connecting rod member 68 into the through hole 71A. The connecting rod member 71 is configured to pivot about the pin 70. The pin 70 protrudes upward from the connecting rod member 71. The upper end of the pin 70 engages with the slot 54 of the slotted cam 51. A through hole 71B is formed at the right end of the connecting rod member 71, extending vertically. An eccentric pin 72 is inserted into the through hole 71B.

[0061] like Figure 12 , Figure 13 As shown, the eccentric pin 72 has cylinders 73, 74, and 75. The axes of cylinders 73, 74, and 75 extend parallel to the vertical direction. The axes of cylinders 73 and 74 are aligned. The axis C2 of cylinder 75 is eccentric relative to the axis C1 of cylinder 74.

[0062] The diameter of the base of cylinder 73 is larger than the diameter of the base of cylinder 74. The diameter of the base of cylinder 74 is larger than the diameter of the base of cylinder 75. Cylinder 74 is connected to the upper end of cylinder 73. Cylinder 75 is connected to the upper end of cylinder 74. A downwardly recessed groove 76 is formed on the upper surface of cylinder 75. The groove 76 can engage with a tool such as a screwdriver.

[0063] like Figure 4 , Figure 9 , Figure 10 As shown, the connecting rod member 77 is a rod-shaped member bent into an L-shape when viewed from above. The connecting rod member 77 has a base 78 and arms 79 and 80. The base 78 is cylindrical. The axis of the base 78 extends parallel to the vertical direction. A through hole 78A extending vertically is formed on the bottom surface of the base 78. A shoulder bolt 65 is inserted into the through hole 78A. The lower end of the shoulder bolt 65 is fixed to the lower frame 11 below the base 78. The connecting rod member 77 is configured to swing about the shoulder bolt 65.

[0064] Arm 79 is a rod-shaped extension extending from base 78 toward eccentric pin 72. A through hole 79A, extending vertically, is formed at the end of arm 79 on the eccentric pin 72 side. The eccentric pin 72 sequentially inserts through holes 71B of the connecting rod member 71 and 79A of arm 79 from bottom to top. A cylinder 74 is inserted into the through hole 71B of the eccentric pin 72. The connecting rod member 71 fixes the cylinder 74. A cylinder 75 is inserted into the through hole 79A of the eccentric pin 72. Arm 79 is configured to swing about the cylinder 75. Because the axis C2 of cylinder 75 is eccentric relative to the axis C1 of cylinder 74 in the eccentric pin 72, if an operator rotates the eccentric pin 72 using a tool, the distance from the through hole 71A of the connecting rod member 71 to the through hole 79A of arm 79 changes.

[0065] Arm 80 is a rod-shaped component extending from base 78 toward shuttle support 20. More specifically, arm 80 extends toward block member 83 through which shuttle shaft 37 is inserted. The extension direction of arm 80 is bent horizontally relative to the extension direction of arm 79. A through hole 80A extending vertically is formed at the end of arm 80 on the block member 83 side.

[0066] The square slider 81 is cuboid in shape. The end of the square slider 81 relative to the block member 83 side of the arm 80 is located at the bottom. A threaded hole 81A recessed downward is formed on the upper surface of the square slider 81. A screw 82 is inserted from above through the through hole 80A of the arm 80 and the washer 80B, and is screwed into the threaded hole 81A of the square slider 81.

[0067] like Figure 6 , Figure 8 As shown, block member 83 is cylindrical. The axis of block member 83 extends parallel to the left-right direction. A groove 85, which is recessed into a U-shape in frontal view, is formed at the upper end of block member 83. The groove 85 extends in the front-rear direction. The groove 85 is formed over the entire front-rear region of block member 83. A square slider 81 is fitted into the groove 85. The square slider 81 can slide in the front-rear direction guided by the groove 85.

[0068] A front surface 86 extending in both the left-right and up-down directions is formed at the front end of the block member 83. A groove 87, recessed from the front surface 86 into an inverted C-shape (in side view), is formed in the block member 83. The groove 87 is formed at the center of the front surface 86 in the up-down direction. The groove 87 extends in the left-right direction. The groove 87 is formed over the entire left-right region of the block member 83.

[0069] A recessed hole 88 is formed at the center of the right side of the block component 83, pointing to the left. A rolling bearing 56 is embedded in the hole 88 (see reference). Figure 5The inner ring diameter of the rolling bearing 56 is the same as the diameter of the shuttle shaft 37. A right-facing recessed hole 89 is formed at the center of the left side of the block member 83. The rolling bearing 57 is embedded in the hole 89 (see reference). Figure 5 The inner ring diameter of the rolling bearing 57 is the same as the diameter of the shuttle shaft 37. A through hole 84 is formed at the center of the bottom surface of holes 88 and 89, allowing the block member 83 to pass through in the left-right direction. The diameter of the through hole 84 is the same as the diameter of the shuttle shaft 37.

[0070] like Figure 5 As shown, the shuttle shaft 37 passes through the through holes 84 of the rolling bearings 56 and 57 and the block member 83 between the clamping member 42 and the connecting clamp 39 in the left-right direction. Through the frictional force acting between the shuttle shaft 37 and the rolling bearings 56 and 57, the shuttle shaft 37 can translate in the left-right direction as an integral part of the block member 83. The shuttle shaft 37 can rotate about its axis relative to the block member 83 via the rolling bearings 56 and 57.

[0071] When the moving mechanism 60 moves the shuttle mechanism 18 in the left-right direction, the stepper motor 50 is driven. Driven by the stepper motor 50, the slotted cam 51 rotates. Due to the rotation of the slotted cam 51, the pin 70 slides in the slot 54 of the slotted cam 51. The connecting rods 68, 71, and 77 are driven in conjunction with the sliding of the pin 70. The arm 80 of the connecting rod 77 swings around the shoulder bolt 65, causing the square slider 81 to slide in the front-back direction guided by the slot 85. The sliding of the square slider 81 in the front-back direction, guided by the slot 85, removes the force that moves the block member 83 in the front-back direction. Therefore, a force acts on the block member 83 to move it in the left-right direction. Thus, the rotational drive of the stepper motor 50 is transformed into a force that moves the block member 83 in the left-right direction. The shuttle shaft 37 translates in the left-right direction by frictional force acting between it and the rolling bearings 56 and 57, becoming integral with the block member 83.

[0072] Ball plug 91 abuts against block component 83 (see reference) Figure 3 ).like Figure 14 , Figure 15 As shown, the ball plug 91 has a cylinder 92 extending in the front-rear direction. The front part of the cylinder 92 is fixed to the lower frame 11 by a nut 94 (see reference). Figure 2 Inside the recessed hole 96 extending forward from the rear end of cylinder 92, spring 97 and ball 93 are sequentially housed from the front. A portion of ball 93 protrudes from the opening 95 of hole 96. Ball 93 engages with groove 87 in block member 83. Spring 97 applies a rearward force to ball 93, causing ball plug 91 to abut against groove 87.

[0073] As above, the shuttle mechanism 18 is supported to the shuttle shaft 37 via the shuttle shaft 47. The shaft center of the shuttle shaft 37 extends in the left-right direction. The shuttle mechanism 18 is moved in the left-right direction of the shuttle shaft 37 by the moving mechanism 60 via the shuttle shaft 37. The transmission mechanism 21 is provided with the pulley 22 and the spline nut 34. The pulley 22 is formed with the hole 26 in the cylinder 24 of the pulley 22. The whole of the spline nut 34 is embedded in the hole 26. The internal teeth 36 are formed in the inner peripheral surface of the spline nut 34 defined by the through hole 35 in the direction parallel to the left-right direction. The external teeth 38 are formed in the side surface of the shuttle shaft 37 in the direction parallel to the left-right direction. The external teeth 38 of the shuttle shaft 37 are engaged with the internal teeth 36 of the spline nut 34. The pulley 22, the spline nut 34, and the shuttle shaft 37 are rotated around the shaft center in an integrated manner by the drive of the sewing machine motor 6. The external teeth 38 are guided by the internal teeth 36 of the through hole 35 when the shuttle shaft 37 is moved in the left-right direction by the moving mechanism 60. Since the whole of the spline nut 34 is embedded in the hole 26, the sewing machine 1 can be downsized in the left-right direction while being provided with the transmission mechanism 21 and the moving mechanism 60.

[0074] The stepping motor 50 of the moving mechanism 60 is built-in with the electromagnetic brake that operates when not energized. The rotation shaft 50A of the stepping motor 50 is inhibited from rotating around the shaft by the electromagnetic brake when not energized. The slot cam 51 is provided above the stepping motor 50. The rotation shaft 50A of the stepping motor 50 is fixed to the slot cam 51. Thus, the sewing machine 1 can simply inhibit the movement of the shuttle mechanism 18 in the left-right direction by not energizing the stepping motor 50 when not moving the shuttle mechanism 18 by the moving mechanism 60. In addition, the sewing machine 1 can simply control the amount of movement of the shuttle mechanism 18 in the left-right direction by controlling the stepping motor 50.

[0075] The moving mechanism 60 is provided with the slot cam 51. The slot cam 51 is rotated by the drive of the stepping motor 50. The pin 70 is slid in the slot 54 of the slot cam 51 by the rotation of the slot cam 51. The link members 68, 71, 77 are driven in linkage with the sliding of the pin 70. When not moving the shuttle mechanism 18 by the moving mechanism 60, the rotation shaft 50A is less likely to rotate compared to the case where the slot cam 51 is not provided. Thus, the sewing machine 1 can reduce the load applied to the stepping motor 50 when not moving the shuttle mechanism 18 by the moving mechanism 60.

[0076] The arm 79 of the link member 77 is positioned above the link member 71. The through hole 71B of the link member 71 and the through hole 79A of the arm 79 are inserted with the eccentric pin 72 from below. The cylinder 74 of the eccentric pin 72 is inserted in the through hole 71B. The link member 71 fixes the cylinder 74. The cylinder 75 of the eccentric pin 72 is inserted in the through hole 79A. The arm 79 is arranged so as to be able to swing with the cylinder 75 as a center. Since the axis C2 of the cylinder 75 is eccentric with respect to the axis Cl of the cylinder 74 in the eccentric pin 72, by rotating the eccentric pin 72 with a tool or the like by the operator, it is possible to adjust the position of the fulcrum at which the arm 79 of the link member 77 swings with respect to the link member 77. Thus, the sewing machine 1 can adjust the movement of the shuttle mechanism 18 in the left-right direction by the moving mechanism 60 with a simple structure.

[0077] By the drive of the stepping motor 50, the arm 80 of the link member 77 swings with the shoulder bolt 65 as a center, and the square block 81 is guided by the groove 85 to slide in the front-rear direction. By the square block 81 being guided by the groove 85 to slide in the front-rear direction, the force that moves the block member 83 in the front-rear direction is removed. Thus, the force that moves the block member 83 in the left-right direction acts on the block member 83. In this way, the rotational drive of the stepping motor 50 is converted into the force that moves the block member 83 in the left-right direction. The shuttle shaft 37 is translationally moved in the left-right direction in a manner integrated with the block member 83 by the frictional force acting between the rolling bearings 56, 57. Thus, the sewing machine 1 can move the shuttle shaft 37 in the left-right direction with the moving mechanism 60 with a simple structure.

[0078] The front portion of the cylinder 92 of the ball plug 91 is fixed to the lower frame 11 by the nut 94. The ball 93 provided at the rear end portion of the ball plug 91 abuts against the groove 87 of the block member 83. The shuttle shaft 37 is rotated around the axis by the drive of the sewing machine motor 6. The force that rotates the block member 83 around the axis of the shuttle shaft 37 acts on the block member 83 by the frictional force acting between the shuttle shaft 37 and the rolling bearings 56, 57. In the sewing machine 1, since the ball plug 91 fixed to the lower frame 11 abuts against the groove 87 of the block member 83, the block member 83 does not rotate with respect to the shuttle shaft 37. Thus, the sewing machine 1 can suppress the rotation of the block member 83 with respect to the shuttle shaft 37 with a simple structure. In addition, since the groove 87 extends in the left-right direction, the ball plug 91 does not interfere with the translational movement of the block member 83 in the left-right direction.

[0079] In the above-described embodiment, the left-right direction is an example of the axial direction of the present application. The hole 26 is an example of the hole portion of the present application. The sewing machine motor 6 is an example of the external power of the present application. The pulley 22 is an example of the rotating body of the present application. The electromagnetic brake of the stepping motor 50 is an example of the braking mechanism of the present application. The groove cam 51 is an example of the cam of the present application. The link member 71 is an example of the first link member of the present application. The link member 77 is an example of the second link member of the present application. The block member 83 is an example of the locking portion of the present application, and is also an example of the bearing portion of the present application. The front-rear direction is an example of the intersecting direction of the present application. The groove 85 is an example of the intersecting engagement portion of the present application. The square slide 81 is an example of the intersecting engaged portion of the present application. The groove 87 is an example of the axial engagement portion of the present application. The lower frame 11 is an example of the frame of the present application. The ball plug 91 is an example of the axial engaged portion of the present application.

[0080] The present application can be variously changed according to the above-described embodiment. The various modification examples described below can be combined as long as there is no contradiction. For example, the axis of the shuttle shaft 37, 47 can intersect the up-down direction, and is not limited to the left-right direction. In the above-described embodiment, the transmission mechanism 21 has the pulley 22, but can have a gear or a cam instead of the pulley 22 as long as it is a structure that rotates around the axis of the shuttle shaft 37. At least a part of the spline nut 34 can be embedded in the hole 26. The spline nut 34 can be embedded in the hole 27.

[0081] The motor that drives the moving mechanism 60 can not be the stepping motor 50, but can be, for example, a servo motor. The stepping motor 50 can not have the electromagnetic brake. The stepping motor 50 can have, for example, a holding portion that mechanically holds the rotation shaft 50A to suppress the rotation of the rotation shaft 50A when there is no power supply instead of the electromagnetic brake.

[0082] The moving mechanism 60 can not have the groove cam 51. The moving mechanism 60 can use, for example, a gear or a cam to transmit the drive of the stepping motor 50. The moving mechanism 60 can convert the rotational drive of the stepping motor 50 into a force that moves the block member 83 in the left-right direction by engaging a pinion fixed to the rotation shaft 50A of the stepping motor 50 with a rack provided to the block member 83. The groove 54 of the groove cam 51 can not be annular in the plan view, but can be formed in, for example, a C shape, a straight line, or a combination of a straight line and a curve in the plan view. Instead of the groove 54 of the groove cam 51, a through-hole that penetrates the circular plate 52 in the up-down direction can be provided.

[0083] The moving mechanism 60 can also not have the link members 68, 71, 77. The number of link members is not limited to the above-described embodiment. The positions of the fulcrums of the oscillation of the link members 68, 71, 77 can also be changed as appropriate. The moving mechanism 60 can also not have the eccentric pin 72. The number of eccentric pins is not limited to the above-described embodiment. The link members 68, 71 can also be connected by the eccentric pin.

[0084] In the above-described embodiment, the moving mechanism 60 acts a force that moves the block member 83 in the left-right direction by the combination of the square slide 81 and the groove 85 of the block member 83. However, this is not limiting, and a recess that is recessed upward and extends in the front-rear direction can be formed in the arm 80 of the link member 77, and a protrusion that engages with the recess can be formed in the upper end of the block member 83. In this case, the moving mechanism 60 acts a force that moves the block member 83 in the left-right direction by the sliding of the recess with respect to the protrusion in the front-rear direction. The groove 85 is not limited to the front-rear direction, and can extend in a direction that intersects the left-right direction in plan view. The groove 85 can also be formed in a curved line or a combination of a straight line and a curved line in plan view, for example.

[0085] In the above-described embodiment, the moving mechanism 60 suppresses a force that rotates the block member 83 about an axis parallel to the left-right direction by the combination of the ball plug 91 and the groove 87 of the block member 83. However, this is not limiting, and the moving mechanism 60 can have a cylinder whose axis extends in the front-rear direction and whose rear surface has a groove that is recessed toward the front and extends in the left-right direction instead of the ball plug 91. In this case, the moving mechanism 60 can also be formed with a protrusion that engages with the groove of the cylinder and extends in the left-right direction. The groove 87 is not limited to the front-rear direction, and can extend in a direction that intersects the left-right direction in plan view. Instead of the groove 87, a hole that is recessed toward the rear can be formed in the front surface 86 of the block member 83. The ball plug 91 can also be provided so as to be movable in the left-right direction.

[0086] In the above-described embodiment, a sewing machine of the door type is described as an example, but this is not limiting, and the same can be applied to a small sewing machine as well as a large sewing machine of the door type.

[0087] Explanation of Reference Signs

[0088] 1 Sewing machine

[0089] 18 Shuttle mechanism

[0090] 22 Pulley

[0091] 34 Spline nut

[0092] 37, 47 Shuttle shaft

[0093] 50 Stepping motor

[0094] 51 Groove cam

[0095] 60 moving mechanism

[0096] 71, 77 link member

[0097] 72 eccentric pin

[0098] 81 square block

[0099] 83 block member

[0100] 91 ball plug

Claims

1. A sewing machine characterized by comprising: Possessing: a shuttle mechanism that captures a surface thread that is inserted through a needle that moves up and down and interweaves the surface thread with a base thread; a shuttle shaft that extends in an axial direction that intersects the up-and-down direction, is rotatable around a shaft that is parallel to the axial direction, and supports the shuttle mechanism; external teeth that are formed on the shuttle shaft and are formed in a direction that is parallel to the axial direction; a moving mechanism that moves the shuttle mechanism in the axial direction via the shuttle shaft; a spline nut into which the shuttle shaft is inserted, has internal teeth that mesh with the external teeth on an inner peripheral surface; and a rotating body that has a hole portion that is open in the axial direction and rotates around the shaft in a manner that transmits an external force, at least a portion of the spline nut is embedded in the hole portion.

2. The sewing machine according to claim 1, wherein the moving mechanism possesses: a motor; and a brake mechanism that suppresses rotation of a rotation shaft of the motor when power is not supplied to the motor.

3. The sewing machine according to claim 1 or 2, wherein the moving mechanism possesses: a motor; and a cam that rotates by driving of the motor and has a second hole portion that is open in a second intersecting direction that intersects the axial direction.

4. The sewing machine according to claim 1 or 2, wherein the moving mechanism possesses: a motor; a first link member that swings by driving of the motor; a second link member that swings by swinging of the first link member; and an eccentric pin that links the first link member and the second link member.

5. The sewing machine according to claim 1 or 2, wherein the moving mechanism possesses: a motor; a clamping portion that is clamped to the shuttle shaft; an intersecting engagement portion that is formed on the clamping portion and extends in an intersecting direction that intersects the axial direction; and an intersecting clamped portion that is guided by the intersecting engagement portion by driving of the motor and moves in the intersecting direction, and transmits a driving force of the motor to the clamping portion in the axial direction.

6. The sewing machine according to claim 1 or 2, wherein the moving mechanism possesses a bearing portion that supports the shuttle shaft so as to be rotatable around the shaft and an axial engagement portion that extends in the axial direction from the bearing portion, and possesses an axial clamped portion that has one end fixed with respect to a frame of the sewing machine, extends toward the axial engagement portion, and has the other end engaged with the axial engagement portion.

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