JP2018000520A - Lower shaft unit and sewing apparatus - Google Patents

Abstract

The present invention provides a lower shaft unit and a sewing device in which a variation in the distance between a sewing needle and a hook sword tip is reduced in a lower shaft unit movable along the extending direction of the upper shaft of the sewing device. A lower shaft unit 4 of a sewing device includes a hook mechanism 41 for driving a hook having a hook sword tip on the outer periphery, and a casing 42 for housing the hook mechanism, and an axial direction of a lower spline shaft of the sewing apparatus. Move the casing along. The lower shaft unit 4 includes insertion holes 48 and 49, a conversion mechanism, and a lower shaft. The insertion holes 48 and 49 insert the lower spline shaft into the housing 42. The conversion mechanism converts the rotational force around the axis of the lower spline shaft inserted through the insertion holes 48 and 49 into the rotational force around the vertical axis perpendicular to the extending direction of the needle bar of the sewing device and the axis of the lower spline shaft. To do. The lower shaft is connected to the conversion mechanism and the hook mechanism, and rotates the hook about the vertical axis. [Selection] Figure 3

Description

  The present invention relates to a lower shaft unit and a sewing device.

  A sewing apparatus that sews a relatively large cloth such as an airbag or a car seat includes an upper shaft unit, a lower shaft unit, and a timing belt. The upper shaft unit and the lower shaft unit move along the extending direction of the upper shaft and the lower shaft (see, for example, Patent Document 1). The upper shaft unit includes a needle bar mechanism that is driven by rotation of the upper shaft, a balance mechanism, and the like. The lower shaft unit includes a shuttle mechanism that is driven by rotation of the lower shaft. The hook mechanism includes a hook having a hook sword tip on the outer periphery, and rotates by a rotating shaft parallel to the extending direction of the lower shaft. The timing belt is installed on the upper shaft and the lower shaft, and the upper shaft and the lower shaft are synchronized.

Japanese Utility Model Publication No.59-174167

  The upper shaft unit of the sewing apparatus of Patent Document 1 is a separate body from the lower shaft unit. The upper shaft unit and the lower shaft unit are subject to vibration in a moving direction parallel to the upper shaft, and the distance in the direction parallel to the upper axis of the sewing needle and the hook point may vary. At this time, in the sewing device, the hook sword tip cannot supplement the upper thread loop, which may cause skipping. In the sewing device, the hook sword tip collides with the sewing needle, and the hook sword tip and the sewing needle may be damaged, the thread may be broken, and the sewing tightening may be poor.

  An object of the present invention is to provide a lower shaft unit and a sewing device in which variations in the distance between a sewing needle and a hook sword tip are reduced in a lower shaft unit movable along the extending direction of the upper shaft of the sewing device.

  The lower shaft unit of the first aspect of the present invention has a hook mechanism that drives a hook having a hook sword tip on the outer periphery, and a housing that houses the hook mechanism, along the axial direction of the lower spline shaft of the sewing device. In the lower shaft unit of the sewing apparatus that moves the housing, an insertion hole through which the lower spline shaft is inserted into the housing, and a rotational force around the axis of the lower spline shaft that is inserted through the insertion hole, A conversion mechanism that converts the extending direction of the needle bar of the sewing device and a rotational force about a vertical axis perpendicular to the axis of the lower spline shaft; and the conversion mechanism and the hook mechanism, and the hook is connected to the vertical mechanism And a lower shaft that rotates around the shaft.

  When the lower shaft unit is applied to the sewing apparatus, the hook rotates around a vertical axis perpendicular to the axis of the lower spline shaft. Therefore, even if the lower shaft unit is subjected to vibration in a direction parallel to the lower spline shaft, the distance between the sewing needle attached to the needle bar and the hook point is less likely to vary even when the lower shaft unit receives vibration in a direction parallel to the lower spline shaft. .

  The lower shaft unit of the lower shaft unit of the first aspect may include a fixing portion that fixes one end and the other end of the belt that moves in the extending direction of the axis of the lower spline shaft. When the lower shaft unit is defective, the operator can easily replace the lower shaft unit by removing the fixing portion of the lower shaft unit from one end and the other end of the belt.

  The conversion mechanism of the lower shaft unit of the first aspect includes a conversion shaft extending in parallel with the lower spline shaft, a first gear provided on the conversion shaft, and a second gear meshing with the first gear, The lower shaft unit includes a first pulley connected to the lower spline shaft, a second pulley provided on the conversion shaft, and a timing belt spanned between the first pulley and the second pulley, The second gear may be provided on the lower shaft. The lower shaft unit can be easily removed from the sewing device by releasing the connection between the first pulley and the lower spline shaft of the sewing device. Therefore, the lower shaft unit can be easily replaced.

  The conversion mechanism of the lower shaft unit of the first aspect includes a conversion shaft extending in parallel with the lower spline shaft, a first gear provided on the conversion shaft, and a second gear meshing with the first gear, The lower shaft unit includes a first pulley connected to the lower spline shaft, a second pulley provided on the conversion shaft, and a timing belt spanned between the first pulley and the second pulley, The second gear may be provided on an intermediate shaft provided in parallel with the lower shaft, and may include a swing mechanism that converts rotation in one direction of the intermediate shaft into reciprocating rotation of the lower shaft. The lower shaft unit can be easily removed from the sewing device by releasing the connection between the first pulley and the lower spline shaft of the sewing device. Therefore, the lower shaft unit can be easily replaced.

  The sewing device according to the second aspect of the present invention includes a needle bar mechanism that moves up and down a needle bar on which a sewing needle is mounted, an upper shaft unit having an upper housing that houses the needle bar mechanism, and the upper housing of the upper shaft unit. An upper spline shaft that transmits power to the needle bar mechanism, a hook mechanism that drives a hook having a hook sword on the outer periphery, a lower shaft unit that has a lower housing that houses the hook mechanism, and the upper side Extending in parallel with the spline shaft, inserted into the lower housing of the lower shaft unit, and installed on the lower spline shaft for transmitting power to the hook mechanism, the upper spline shaft and the lower spline shaft, A synchronization mechanism that synchronizes the rotation of the upper spline shaft and the lower spline shaft; and the upper shaft unit is moved along the axial direction of the upper spline shaft, and the lower spline is synchronized with the movement of the upper shaft unit. Axis of axis In a sewing apparatus including an X movement mechanism that moves the lower shaft unit along a direction, rotational force around the axis of the lower spline shaft is applied to the extending direction of the needle bar and the axis of the lower spline shaft. A conversion mechanism that converts rotational force around a vertical axis; and a lower shaft that is connected to the conversion mechanism and the hook mechanism and rotates the hook around the vertical axis.

  In the sewing device, the hook rotates around a vertical axis perpendicular to the axis of the lower spline shaft. Therefore, even if the lower shaft unit receives vibration in a direction parallel to the lower spline shaft, the distance between the sewing needle and the hook sword tip is less likely to vary compared to the conventional sewing device.

  The sewing device according to the second aspect further includes an upper shaft that is connected to the needle bar mechanism, is provided in parallel with the upper spline shaft, and a transmission member that transmits rotation about the axis of the upper spline shaft to the upper shaft. May be. The sewing apparatus does not need to convert the rotational force around the axis of the upper spline into a rotational force in a direction parallel to the vertical axis in the upper shaft unit. Therefore, the sewing apparatus can simplify the configuration of the upper shaft unit as compared with the case where the rotational force around the axis of the upper spline is converted into a direction parallel to the vertical axis. The sewing device is easy to maintain for synchronizing the upper and lower shafts.

  The sewing device according to the second aspect may further include a Y moving mechanism that moves the sewing object relative to the lower shaft unit in the extending direction of the vertical shaft. The sewing apparatus can move the sewing object relative to the lower shaft unit by the X moving mechanism and the Y moving mechanism. Since the upper shaft unit and the lower shaft unit are separate from each other in the sewing device, it is easy to design the size of the sewing device in accordance with the size of the sewing object.

  The X movement mechanism of the sewing device according to the second aspect includes a belt that moves in the extending direction of the axis of the lower spline shaft, and one end and the other end of the belt that are detachably fixed to the lower housing. You may provide a fixing | fixed part. When the sewing machine has a problem with the lower shaft unit, the lower shaft unit can be easily replaced by removing the fixing portion from one end and the other end of the belt.

  The conversion mechanism of the sewing device according to the second aspect includes a conversion shaft extending parallel to the lower spline shaft, a first gear provided on the conversion shaft, and a second gear meshing with the first gear, The shaft unit includes a first pulley connected to the lower spline shaft, a second pulley provided on the conversion shaft, and a timing belt spanned between the first pulley and the second pulley. The two gears may be provided on the lower shaft. The sewing device can be easily detached from the sewing device by releasing the connection between the first pulley of the lower shaft unit and the lower spline shaft of the sewing device. Therefore, the sewing machine can easily replace the lower shaft unit.

  The conversion mechanism of the sewing device according to the second aspect includes a conversion shaft extending parallel to the lower spline shaft, a first gear provided on the conversion shaft, and a second gear meshing with the first gear, The shaft unit includes a first pulley connected to the lower spline shaft, a second pulley provided on the conversion shaft, and a timing belt spanned between the first pulley and the second pulley. The two gears may be provided on an intermediate shaft provided in parallel with the lower shaft, and may include a swing mechanism that converts the rotation of the intermediate shaft in one direction into the reciprocating rotation of the lower shaft. The sewing device can be easily detached from the sewing device by releasing the connection between the first pulley of the lower shaft unit and the lower spline shaft of the sewing device. Therefore, the sewing machine can easily replace the lower shaft unit.

FIG. 3 is a perspective view of the sewing device 1. The perspective view of the upper shaft unit 2. FIG. The perspective view of the lower axis | shaft unit 4, the lower side spline axis | shaft 5, and the belt 72. FIG. The top view of the lower shaft unit 4 and the belt 72. FIG. The right side view of the lower shaft unit 4 and the belt 72. The perspective view of the conversion mechanism 43 when the hook 12 of the lower shaft unit 4 is a full rotation hook. The front view of the conversion mechanism 43 when the hook 12 of the lower shaft unit 4 is a full rotation hook. The front view of the X moving mechanism 6. FIG. The perspective view of the Y moving mechanism 7. FIG. The right view of the Y moving mechanism 7. FIG. The left view of the synchronous mechanism 8 when the hook 12 of the lower shaft unit 4 is a full rotation hook. The perspective view of the conversion mechanism 143 of 2nd embodiment. The front view of the conversion mechanism 143 of 2nd embodiment. The left view of the synchronization mechanism 208 of 2nd embodiment. The left view of the lower shaft unit 304 of 3rd embodiment.

  The lower shaft unit of the sewing device according to the present invention includes any one of a half-turn hook and a full-turn hook as a hook. Referring to the drawings, the first embodiment is when the hook is a full rotary hook, the second embodiment is when the hook is a half rotary hook, and the first embodiment when the hook is a full rotary hook. Another embodiment will be described in order as a third embodiment. In the following description, left, right, front, back, and top and bottom indicated by arrows in the figure are used. The following description will be given the same reference numerals when having the same configuration in different embodiments.

  A schematic structure of the sewing device 1 according to the first embodiment will be described. As shown in FIG. 1, the sewing apparatus 1 includes an upper shaft unit 2, an upper spline shaft 3, a lower shaft unit 4, a lower spline shaft 5, an X moving mechanism 6, a Y moving mechanism 7, a synchronizing mechanism 8, and a control unit. . As shown in FIG. 2, the upper shaft unit 2 includes a needle bar mechanism 21 and an upper housing 22. The needle bar mechanism 21 moves the needle bar 24 up and down. The upper housing 22 accommodates the needle bar mechanism 21. The upper spline shaft 3 is a rod-like member extending in the left-right direction, and has a groove extending in the left-right direction on the outer peripheral surface. The upper spline shaft 3 is inserted into the upper housing 22 of the upper shaft unit 2 and transmits power to the needle bar mechanism 21. As shown in FIG. 3, the lower shaft unit 4 includes a shuttle mechanism 41 and a lower housing 42. The shuttle mechanism 41 drives the shuttle 12 having the shuttle sword tip 11 (see FIG. 7) on the outer periphery. The lower housing 42 accommodates the shuttle mechanism 41. The lower spline shaft 5 is a rod-like member extending in parallel with the upper spline shaft 3 and has a groove extending in the left-right direction on the outer peripheral surface. The lower spline shaft 5 is inserted into the lower housing 42 of the lower shaft unit 4 and transmits power to the shuttle mechanism 41. The hook 12 of the lower shaft unit 4 is a full rotation hook, and the sewing apparatus 1 rotates the upper shaft 25 and the lower shaft 44 in different directions by the power of the drive source. The X moving mechanism 6 moves the upper shaft unit 2 along the axial direction of the upper spline shaft 3, and moves along the axis 14 (see FIG. 6) direction of the lower spline shaft 5 in synchronization with the movement of the upper shaft unit 2. The lower shaft unit 4 is moved. The X moving mechanism 6 moves the upper shaft unit 2 and the lower shaft unit 4 in the left-right direction. The Y moving mechanism 7 moves the cloth to be sewn in the extending direction (front-rear direction) of the lower shaft 44 (see FIG. 6) relative to the lower shaft unit 4. The synchronization mechanism 8 is installed on the upper spline shaft 3 and the lower spline shaft 5 to synchronize the rotation of the upper spline shaft 3 and the lower spline shaft 5. The control unit controls the X movement mechanism 6, the Y movement mechanism 7, and the synchronization mechanism 8.

  The upper shaft unit 2 will be described. As shown in FIG. 2, the upper shaft unit 2 includes an upper shaft 25, a transmission member 26, and a balance mechanism in addition to the needle bar mechanism 21 and the upper housing 22. The upper housing 22 faces the lower housing 42. The upper housing 22 includes a main body portion 27, a distal end portion 28, and a fixing portion 30. The main body 27 has a box shape that is long in the left-right direction. The tip 28 extends below the left end of the main body 27. The fixed portion 30 has a substantially rectangular frame shape that is longer in the vertical direction than the main body portion 27, and is positioned on the back side of the main body portion 27. The fixed portion 30 includes holes 32 and 33, four support members 34, and arm portions 37. The holes 32 and 33 are circular when viewed from the right side. The hole 32 is provided on the left surface of the fixing portion 30, and the hole 33 is provided on the right surface of the fixing portion 30. The holes 32 and 33 are inserted through the upper spline shaft 3. Each support member 34 is C-shaped in a right side view extending in the left-right direction, and has a groove 35 on the back surface. The support members 34 are provided in the upper right portion, the upper left portion, the lower right portion, and the lower left portion of the rear surface of the fixed portion 30. The groove portion 35 of the support member 34 provided in the upper right portion and the upper left portion of the rear surface of the fixed portion 30 engages with a rail 67 extending in the left-right direction, and the groove portion 35 of the support member 34 provided in the lower right portion and the lower left portion of the rear surface of the fixed portion 30. Engages with a rail 68 extending in the left-right direction below the rail 67. The arm portion 37 extends in parallel with the right side surface of the main body portion 27 at the lower end portion of the fixing portion 30 and is fixed to the right side surface of the main body portion 27 with screws.

  The upper shaft 25 is provided in parallel with the upper spline shaft 3 and extends in the main body 27 in the left-right direction. The transmission member 26 transmits the rotation around the axis of the upper spline shaft 3 to the upper shaft 25. The rotation direction of the upper shaft 25 viewed from the left side is referred to as the upper shaft rotation direction. The direction of rotation of the upper shaft is clockwise. The left side is the needle bar 24 side with respect to the upper shaft 25. In this example, the transmission member 26 includes a ball spline bearing 36 provided on the upper spline shaft 3, a first pulley connected to the ball spline bearing 36, a second pulley provided on the upper shaft 25, and a first pulley and a second pulley. Timing belt. The ball spline bearing 36 is supported by the hole 33. The upper shaft 25 is connected to the needle bar mechanism 21 and the balance mechanism, and drives the needle bar mechanism 21 and the balance mechanism with the rotational force transmitted through the upper spline shaft 3. The balance mechanism includes a balance 29. The balance 29 moves up and down during sewing to pull up the upper thread. The needle bar mechanism 21 moves the needle bar 24 up and down in conjunction with the vertical movement of the balance 29. The lower end portion of the needle bar 24 is exposed from the lower side of the distal end portion 28 and extends downward. The needle bar 24 has a sewing needle 23 attached to its lower end.

  The lower shaft unit 4 will be described. 3 to 7, the lower shaft unit 4 includes a conversion mechanism 43, a lower shaft 44, a first pulley 45, a second pulley 46, and a timing belt 47 in addition to the shuttle mechanism 41 and the lower housing 42. The lower housing 42 has a substantially rectangular parallelepiped box shape. The lower housing 42 includes insertion holes 48 and 49, a needle plate 50, and fixing portions 51 and 52. The insertion hole 48 is provided on the left surface of the lower housing 42, and the insertion hole 49 is provided on the right surface of the lower housing 42. The insertion holes 48 and 49 are inserted through the lower spline shaft 5. The lower housing 42 supports the lower spline shaft 5 via a ball spline bearing 39. The ball spline bearing 39 is supported by the insertion hole 48. The lower housing 42 is provided with a needle plate 50 on the upper surface. The needle plate 50 has a needle hole 53 through which the lower end of the sewing needle 23 passes when the needle bar 24 is lowered.

  The fixing portions 51 and 52 are frame-like shapes that extend in the vertical direction when viewed from the front and have beams. The fixing portion 51 is provided on the left rear portion of the lower housing 42, and the fixing portion 52 is provided on the right rear portion of the lower housing 42. The fixing portions 51 and 52 pass the belt 72 that moves the lower shaft unit 4 in the extending direction (left-right direction) of the axis line 14 of the lower spline shaft 5, and fixes one end and the other end of the belt 72. Specifically, the belt 72 has internal teeth. The inner teeth are teeth on the inner peripheral side when the belt is looped around. The outer peripheral side of the belt 72 is planar. The fixing portions 51, 52 are arranged with a belt 72 between the lower housing 42 and the four corners of the fixing portions 51, 52 with the inner teeth of the belt 72 being passed between the beams of the fixing portions 51, 52. Is fixed to the back surface of the lower housing 42 with screws. The lower shaft unit 4 can be attached to and detached from the sewing apparatus 1. When removing the lower shaft unit 4 from the sewing apparatus 1, the operator removes one end and the other end of the belt 72 from the fixing portions 51 and 52, moves the lower spline shaft 5 in the left-right direction, and removes it from the insertion holes 48 and 49. . The lower surface of the lower housing 42 is fixed to the upper surface of the support base 54. The support base 54 is a plate having a rectangular shape in plan view. The support base 54 has four support members 55 that are U-shaped when viewed from the right side. The four support members 55 are provided on the front right part, front left part, rear right part, and rear left part of the support base 54 and extend in the left-right direction. The four support members 55 have grooves 56 that are recessed upward. The groove 56 engages with a rail 69 (see FIG. 1) extending in the left-right direction.

  As shown in FIG. 6, the conversion mechanism 43 causes the rotational force around the axis 14 of the lower spline shaft 5 to be perpendicular to the extending direction (vertical direction) of the needle bar 24 of the sewing device 1 and the axis 14 of the lower spline shaft 5. It is converted into a rotational force around the vertical axis 15. The vertical axis 15 extends on a plane parallel to the horizontal plane. The conversion mechanism 43 includes a conversion shaft 57, a first gear 58, and a second gear 59. The conversion shaft 57 extends in parallel with the lower spline shaft 5. The conversion shaft 57 extends in the left-right direction behind the lower spline shaft 5. The first gear 58 is a screw gear provided on the conversion shaft 57. The second gear 59 is a screw gear provided on the lower shaft 44 and meshes with the first gear 58.

  The lower shaft 44 is connected to the conversion mechanism 43 and the shuttle mechanism 41 to rotate the shuttle 12 around the vertical axis 15 perpendicular to the axis 14 of the lower spline shaft 5. The lower shaft 44 extends in the front-rear direction and is rotatably supported by the lower housing 42. The rotation direction of the lower shaft 44 viewed from the front side is referred to as a lower shaft rotation direction. The front side is the shuttle 12 side with respect to the lower shaft 44. The direction of rotation of the lower shaft is counterclockwise, and is opposite to the direction of rotation of the upper shaft. The lower shaft 44 is rotated according to the rotation of the upper shaft 25 by the power of the motor 131. The first pulley 45 is connected to the lower spline shaft 5 via a ball spline bearing 39. The second pulley 46 is provided at the left end portion of the conversion shaft 57. The timing belt 47 is a belt-like member and is stretched between the first pulley 45 and the second pulley 46. The diameter of the first pulley 45 is larger than the diameter of the second pulley 46. Therefore, when the rotational force of the lower spline shaft 5 is transmitted to the conversion shaft 57 via the timing belt 47, the rotational speed of the conversion shaft 57 is larger than the rotational speed of the lower spline shaft 5. The diameter of the first gear 58 and the diameter of the second gear 59 are the same. Therefore, the rotational speed of the lower shaft 44 is the same as the rotational speed of the conversion shaft 57 and is larger than the rotational speed of the lower spline shaft 5.

  The X moving mechanism 6 will be described. As shown in FIGS. 1 and 8, the X moving mechanism 6 includes a pair of left and right support plates 61 and 62, plate portions 63 and 64, a base portion 65, rails 67 to 69, belts 71 and 72, a motor 73, a transmission member 75, A shaft 76, pulleys 77 and 78, and shafts 79 and 80 are provided. The support plates 61 and 62 are rectangular plate-like members that are long in the vertical direction when viewed from the right side. The support plates 61 and 62 are fixed to the side surface of the base portion 65 at a position where the lower ends are separated from the installation surface. The extending direction of the support plates 61 and 62 substantially coincides with the vertical direction. The support plate 61 supports the left end portions of the plate portions 63 and 64, the upper spline shaft 3, and the lower spline shaft 5. The support plate 61 supports a later-described synchronization mechanism 8 on the left surface, and supports shafts 79 and 80 extending in the vertical direction on the right surface. The support plate 62 supports the right end portions of the plate portions 63 and 64, the upper spline shaft 3, and the lower spline shaft 5. The support plate 62 supports the motor 73, the transmission member 75, the shaft 76, and the pulleys 77 and 78 on the right surface.

  The plate parts 63 and 64 are plate members that extend substantially parallel to the horizontal plane, and have a rectangular shape that is long in the left-right direction in plan view. The left end and the right end of the plate portion 63 are fixed to the support plates 61 and 62 by fixtures 81 and 82 having a substantially L shape in front view. The plate portion 63 fixes a rail 67 extending in the left-right direction to the front surface. The left end and the right end of the plate portion 64 are fixed to the support plates 61 and 62 by fixtures 83 and 84 having a substantially L shape in a front view. The plate part 64 is provided below the plate part 63. The plate portion 64 fixes a rail 68 extending in the left-right direction to the front surface. The rails 67 and 68 engage with the support member 34 of the upper shaft unit 2 and guide the movement of the upper shaft unit 2 in the left-right direction.

  The base portion 65 is a rectangular box as viewed from the front. The base portion 65 includes a pair of upper and lower plate portions 85 and 86 extending in parallel with the plate portions 63 and 64 and a pair of left and right plate portions 87 and 88 extending in parallel with the support plates 61 and 62. The plate portion 85 includes a rail 69 extending in the left-right direction on the upper surface. The rail 69 engages with the support member 55 of the lower shaft unit 4 and guides the movement of the lower shaft unit 4 in the left-right direction. The plate portion 86 is in contact with the installation surface of the sewing device 1. The plate portion 87 fixes the lower end portion of the support plate 61. The plate portion 88 fixes the lower end portion of the support plate 62.

  The belt 71 is a belt-like member that spans the pulley 77 and the shaft 79. One end and the other end of the belt 71 are detachably fixed to a fixing portion 30 provided on the back side of the upper shaft unit 2. The belt 72 is a belt-like member that spans the pulley 78 and the shaft 80. One end and the other end of the belt 72 are detachably fixed to fixing portions 51 and 52 provided on the back side of the lower shaft unit 4. The motor 73 supplies power for moving the upper shaft unit 2 and the lower shaft unit 4 in the left-right direction. The motor 73 is fixed to the right surface of the support plate 62. The transmission member 75 is provided on a shaft 76 extending in the vertical direction. The transmission member 75 is connected to the output shaft of the motor 73 and transmits the driving force of the motor 73 to the shaft 76. The shaft 76 is provided with a pulley 77 at the upper end and a pulley 78 at the lower end. The support plate 62 supports the shaft 76 so as to be rotatable around an axis extending in the vertical direction. When the shaft 76 is rotated by the driving force of the motor 73, the belts 71 and 72 move clockwise or counterclockwise in plan view according to the rotation direction and the rotation amount of the shaft 76. When the belt 71 moves, the upper shaft unit 2 moves in the left-right direction along the rails 67 and 68 by the same amount as the belt 71. When the belt 72 moves, the lower shaft unit 4 moves in the left-right direction along the rail 69 by the same amount as the belt 72.

  The Y moving mechanism 7 will be described. As shown in FIGS. 9 and 10, the Y moving mechanism 7 includes a holding body 91 that holds a sewing target, and moves the holding body 91 in the front-rear direction. The Y moving mechanism 7 moves the holding body 91 in a direction on a horizontal plane perpendicular to the moving direction of the upper shaft unit 2 and the lower shaft unit 4 depending on the X moving mechanism 6. The holding body 91 includes a lower frame 92, an upper frame 93, support portions 94 to 96, and an air cylinder 97. The lower frame 92 and the upper frame 93 are rectangular frames in plan view, and hold a sewing object between them. The sewing area of the sewing device 1 is set inside the lower frame 92 and the upper frame 93. The support portion 94 is connected to the left side rear of the upper frame 93, and the support portion 95 is connected to the right side rear of the upper frame 93. The support portion 96 has a plate shape extending in the left-right direction, and fixes the back surfaces of the support portions 94 and 95 to the front surface. The air cylinder 97 supplies power for opening and closing the upper frame 93 to the lower frame 92 by intake and exhaust of air. The support portions 94 and 95 move the upper frame 93 in the vertical direction by the driving force of the air cylinder 97.

  The Y moving mechanism 7 includes support plates 101 and 102, a base plate portion 103, support platforms 104 and 105, a shaft 106, a motor 107, support platforms 108 and 109, shafts 110 and 111, and belts 112 and 113. The Y moving mechanism 7 further includes upper guide portions 114 and 115, beam portions 116 and 125, frame support portions 117 and 118, base portions 119 and 120, and guide portions 121 and 122. Since the Y moving mechanism 7 is symmetric about the center M in the left-right direction, the right side of the Y moving mechanism 7 will be described, and the description on the left side will be omitted.

  The support plate 102 is a rectangular plate member that is long in the vertical direction when viewed from the front. The support plate 102 is provided at the right rear end of the Y moving mechanism 7 substantially parallel to the vertical plane. The base plate 103 has a rectangular plate shape in plan view. The support plate 102 supports the right rear end of the base plate portion 103. The base plate portion 103 is substantially parallel to the horizontal plane. The support base 105 is a member having a trapezoidal shape in a right side view and a U-shape in a front view. The support base 105 is provided on the upper surface of the right front part of the base plate part 103. The motor 107 is provided on the upper surface of the front portion at the center in the left-right direction of the base plate 103 and supplies power for moving the holding body 91 in the front-rear direction. The shaft 106 extends in the left-right direction and is connected to the output shaft of the motor 107 via a gear. The support base 105 supports the right end portion of the shaft 106, and the support base 104 supports the left end portion of the shaft 106. The shaft 106 is rotated by driving a motor 107. The support base 109 is provided at the lower part of the front surface of the support plate 102 and supports a shaft 111 extending in the left-right direction. The belt 113 is a belt-like member that spans the shaft 106 and the shaft 111. The upper guide portion 115 is a quadrangular columnar member extending forward from the front surface of the support plate 102. The upper guide part 115 has a rail 123 extending in the front-rear direction on the lower surface, and guides the movement of the holding body 91 in the front-rear direction. The rail 123 is provided above the belt 113 in parallel with the belt 113. The beam portions 116 and 125 are quadrangular columnar members extending in the left-right direction. The left end of the beam portion 116 is fixed to the right front portion of the upper guide portion 114, and the right end is fixed to the left front portion of the upper guide portion 115. The left end of the beam portion 125 is fixed to the right rear portion of the upper guide portion 114, and the right end is fixed to the left rear portion of the upper guide portion 115. The base portion 120 supports the lower side of the rear end of the frame support portion 118 and is fixed to the upper surface of the belt 113. The base portion 120 moves integrally with the belt 113. The guide portion 122 is fixed to the upper surface of the rear end of the frame support portion 118 and engages with a rail 123 provided on the lower surface of the upper guide portion 115. The front end portion of the frame support portion 118 is connected to the right end portion of the support portion 96.

  When the motor 107 is driven, the shaft 106 rotates. The belts 113 and 112 move clockwise or counterclockwise as viewed from the right side according to the rotation amount and rotation direction of the shaft 106. The base 120 fixed to the belt 113 moves together with the belt 113. The base portion 119 fixed to the belt 112 moves together with the belt 112. When the base part 120 moves in the front-rear direction, the frame support part 118 that supports the holding body 91 moves in the front-rear direction along the rail 123 via the guide part 122. When the base part 119 moves in the front-rear direction, the frame support part 117 that supports the holding body 91 moves in the front-rear direction along the rail via the guide part 121. Therefore, the holding body 91 moves in the front-rear direction.

  The synchronization mechanism 8 will be described. As shown in FIG. 11, the synchronization mechanism 8 includes a motor 131, a drive pulley 133, an upper pulley 134, a lower pulley 135, an idler pulley 138, both toothed belts 139, pulleys 140 and 141, and a mounting portion 144. The motor 131 is provided on the right rear side of the support plate 61 and has an output shaft 132 extending in the left-right direction. The output shaft 132 is inserted from the right side to the left side of the support plate 61. The drive pulley 133 is fixed to the left end of the output shaft 132. The upper pulley 134 is provided on the left surface of the support plate 61 and is fixed to the left end of the upper spline shaft 3. The lower pulley 135 is provided on the left surface of the support plate 61 below the upper pulley 134 and is fixed to the left end of the lower spline shaft 5. The upper pulley 134 and the lower pulley 135 are located in front of the output shaft 132. The diameter of the lower pulley 135 is the same as the diameter of the upper pulley 134. The idler pulley 138 is provided on the left surface of the support plate 61. The idler pulley 138 is a pulley capable of adjusting the tension of the both tooth belts 139 between the upper pulley 134 and the lower pulley 135 in the drive path of the both tooth belts 139. The fixed position of the idler pulley 138 in the vertical direction is between the upper pulley 134 and the lower pulley 135 and closer to the lower pulley 135. The fixed position in the front-rear direction of the idler pulley 138 is on the front side of the line segment connecting the upper pulley 134 and the lower pulley 135. The diameter of idler pulley 138 is smaller than the diameter of upper pulley 134 and lower pulley 135. The attachment portion 144 attaches the idler pulley 138 to the support plate 61 so as to be removable.

  Both tooth belts 139 have a belt shape having internal teeth 127 and external teeth 128. Both toothed belts 139 are wound around a drive pulley 133, an upper pulley 134, a lower pulley 135, and an idler pulley 138. In the two-tooth belt 139, one of the inner teeth 127 and the outer teeth 128 meshes with the outer periphery of the lower pulley 135, and the other of the inner teeth 127 and the outer teeth 128 meshes with the outer periphery of the upper pulley 134. Both toothed belts 139 are engaged with the outer teeth of the driving pulley 133 by the inner teeth 127 or the outer teeth 128. The external teeth 128 of the two-tooth belt 139 in this example mesh with the outer peripheral portion of the lower pulley 135, and the inner teeth 127 mesh with the outer peripheral portion of the upper pulley 134. The internal teeth 127 of the both tooth belts 139 mesh with the outer peripheral portion of the drive pulley 133. The pulley 140 is provided between the upper pulley 134 and the driving pulley 133 and meshes with the external teeth 128 of the both tooth belts 139. The pulley 141 is provided between the upper pulley 134 and the idler pulley 138 and meshes with the external teeth 128 of the both tooth belts 139. The pulleys 140 and 141 prevent the double-tooth belt 139 from being bent. When the motor 131 is driven and the output shaft 132 rotates clockwise as viewed from the left side, the upper pulley 134 and the lower pulley 135 rotate via the both-tooth belt 139. The upper pulley 134 rotates clockwise in the left side view, and the lower pulley 135 rotates counterclockwise in the left side view.

  The sewing operation of the sewing device 1 will be described. The operator puts a sewing object between the lower frame 92 and the upper frame 93 of the holding body 91. The operator inputs an instruction to start sewing according to the sewing data to the control unit. The sewing data includes coordinate data in which needle drop points are determined in order. The needle drop point is a predetermined position on the sewing target where the sewing needle 23 is stuck when the sewing needle 23 moves downward together with the needle bar 24. The control unit starts sewing according to the sewing data in accordance with the instruction. The control unit drives the X moving mechanism 6 and the Y moving mechanism 7 according to the sewing data, and moves the sewing object relative to the upper shaft unit 2 and the lower shaft unit 4. The controller drives the synchronization mechanism 8 to rotate the upper spline shaft 3 in the clockwise direction when viewed from the left side, and to rotate the lower spline shaft 5 in the counterclockwise direction when viewed from the left side using the both tooth belts 139. The upper shaft unit 2 transmits the rotation of the upper spline shaft 3 to the upper shaft 25. The direction of rotation of the upper shaft is clockwise. The needle bar mechanism 21 moves the needle bar 24 up and down by the rotational force of the upper shaft 25. The lower shaft unit 4 transmits the counterclockwise rotation of the lower spline shaft 5 when viewed from the left side to the lower shaft 44 via the conversion mechanism 43. The direction of rotation of the lower shaft is counterclockwise, and is opposite to the direction of rotation of the upper shaft. The lower shaft 44 rotates the hook 12 counterclockwise when viewed from the front. The shuttle 12 cooperates with the needle bar 24 and entangles the lower thread drawn from the bobbin case with the upper thread held by the sewing needle 23. The balance mechanism pulls the upper thread entangled with the lower thread onto the needle plate 50 and forms a stitch on the sewing target.

  A sewing device 1 according to a second embodiment will be described. As shown in FIG. 1, the sewing apparatus 1 according to the second embodiment includes an upper shaft unit 2, an upper spline shaft 3, a lower shaft unit 204, a lower spline shaft 5, an X movement mechanism 6, a Y movement mechanism 7, a synchronization mechanism 208, A control unit is provided. The sewing apparatus 1 of the second embodiment is different from the sewing apparatus 1 of the first embodiment in the configuration of the synchronization mechanism 208 and the lower shaft unit 204, and the other configurations are the same. Hereinafter, description of the same structure as the sewing device 1 of the first embodiment will be omitted, and the lower shaft unit 204 and the synchronization mechanism 208 different from the sewing device 1 of the first embodiment will be described. Explanation of the same members as those of the sewing device 1 of the first embodiment is simplified or omitted.

  As shown in FIGS. 12 and 13, the lower shaft unit 204 of the second embodiment includes a shuttle mechanism 241 and a lower housing 242. The hook mechanism 241 drives a hook 212 having a hook sword tip 211 (see FIG. 13) on the outer periphery. The lower housing 242 accommodates the shuttle mechanism 241. The hook 212 of the lower shaft unit 204 is a half-turn hook, and the lower shaft 44 reciprocates in response to the rotation of the upper shaft 25 by the power of the motor 131. The lower shaft unit 204 includes a conversion mechanism 143, a lower shaft 44, a first pulley 45, a second pulley 46, and a timing belt 47 in addition to the shuttle mechanism 241 and the lower housing 242. The lower housing 242 has a substantially rectangular parallelepiped box shape. The lower housing 242 includes insertion holes 248 and 249, a needle plate 50, and fixing portions 51 and 52. The insertion hole 248 is provided on the left surface of the lower housing 242, and the insertion hole 249 is provided on the right surface of the lower housing 42. The insertion holes 248 and 249 pass through the lower spline shaft 5. The lower housing 242 supports the lower spline shaft 5 via a ball spline bearing 39. The ball spline bearing 39 is supported by the insertion hole 248. The needle plate 50 has a needle hole 53 through which the lower end of the sewing needle 23 passes when the needle bar 24 is lowered. The lower surface of the lower housing 242 is fixed to the upper surface of the support base 54 as in the first embodiment.

  The conversion mechanism 143 converts the rotational force around the axis line 14 of the lower spline shaft 5 into the rotational force around the vertical axis 225 perpendicular to the extending direction of the needle bar 24 of the sewing device 1 and the axis line 14 of the lower spline shaft 5. . The vertical axis 225 extends on a plane parallel to the horizontal plane. The conversion mechanism 143 includes a conversion shaft 157, a first gear 158, and a second gear 160. The conversion shaft 157 extends in parallel with the lower spline shaft 5. The first gear 158 is a screw gear provided on the conversion shaft 157. The second gear 160 is a screw gear provided on the intermediate shaft 159. The intermediate shaft 159 extends vertically and horizontally below the conversion shaft 157 and is supported by the lower housing 242 so as to be rotatable. The intermediate shaft 159 extends in parallel with the lower shaft 44. The swing mechanism 168 converts the rotation of the intermediate shaft 159 in one direction into the reciprocating rotation of the lower shaft 44. The swing mechanism 168 includes an eccentric wheel 161, a crank rod 167, a link piece 163, a gear piece 165, and a gear 166. The eccentric wheel 161 has a substantially circular columnar shape when viewed from the front, and is eccentric from the axis of the intermediate shaft 159 and connected to the intermediate shaft 159. The crank rod 167 has a plate shape that is long in the left-right direction, and the left end portion of the crank rod 167 is connected to the eccentric wheel 161. The crank rod 167 is provided in front of the second gear 160. The link piece 163 is an oval plate member. The right end of the crank rod 167 is rotatably connected to one end of the link piece 163 by a connecting portion 162. The link piece 163 extends upward from one end. The gear piece 165 is a sectoral sector gear. The other end of the link piece 163 is connected to the gear piece 165 by a connecting portion 164. The connecting portion 164 is supported by the lower housing 242. The gear 166 is provided on the lower shaft 44. The gear piece 165 meshes with the gear 166.

  When the intermediate shaft 159 rotates by the rotation of the conversion shaft 157, the crank rod 167 reciprocally swings in the left-right direction via the eccentric wheel 161. When the crank rod 167 reciprocally swings, the gear piece 165 reciprocally swings around the connecting portion 164 via the link piece 163. Therefore, the lower shaft 44 reciprocates.

  As shown in FIG. 14, the synchronization mechanism 208 of the second embodiment includes a motor 131, a drive pulley 133, an upper pulley 134, a lower pulley 135, a belt 239, and pulleys 140 and 141. The belt 239 may have teeth on both the inside and the outside, or may have teeth only on the inside. The belt 239 is stretched so that the inner teeth mesh with the outer peripheral portions of the drive pulley 133, the upper pulley 134, and the lower pulley 135. The pulley 140 is provided between the upper pulley 134 and the driving pulley 133 and contacts the outside of the belt 239. The pulley 141 is provided between the upper pulley 134 and the lower pulley 135 and contacts the outside of the belt 239. The pulleys 140 and 141 prevent the belt 239 from bending. When the motor 131 is driven and the output shaft 132 rotates clockwise as viewed from the left side, the upper pulley 134 and the lower pulley 135 rotate via the belt 239. The upper pulley 134 and the lower pulley 135 rotate clockwise when viewed from the left side.

  The sewing operation of the sewing device 1 according to the second embodiment will be described. The operator puts a sewing object between the lower frame 92 and the upper frame 93 of the holding body 91. The operator inputs an instruction to start sewing according to the sewing data to the control unit. The control unit starts sewing according to the sewing data in accordance with the instruction. The control unit drives the X moving mechanism 6 and the Y moving mechanism 7 according to the sewing data, and moves the sewing object relative to the upper shaft unit 2 and the lower shaft unit 4. The control unit drives the synchronization mechanism 208 to rotate the upper spline shaft 3 and the lower spline shaft 5 clockwise as viewed from the left side. The upper shaft unit 2 transmits the rotation of the upper spline shaft 3 to the upper shaft 25. The upper shaft 25 moves the needle bar 24 up and down. The lower shaft unit 204 transmits the rotation of the lower spline shaft 5 to the lower shaft 44 via the conversion mechanism 143 and the swing mechanism 168, and reciprocates the shuttle 212. The conversion mechanism 143 rotates the intermediate shaft 159 clockwise in front view. The swing mechanism 168 converts the clockwise rotation of the intermediate shaft 159 into the swing motion of the hook 212 about the vertical shaft 225. The shuttle 212 cooperates with the needle bar 24 and entangles the lower thread pulled out from the bobbin case with the upper thread held by the sewing needle 23. The balance mechanism pulls the upper thread entangled with the lower thread onto the needle plate 50 and forms a stitch on the sewing target.

  The sewing apparatus 1 according to the third embodiment will be described. In the sewing device 1 according to the third embodiment, the hook is a full rotation hook, and the lower shaft rotation direction is opposite to the upper shaft rotation direction in the lower shaft unit. The sewing device 1 includes an upper shaft unit 2, an upper spline shaft 3, a lower shaft unit 304, a lower spline shaft 5, an X moving mechanism 6, a Y moving mechanism 7, a synchronizing mechanism 208, and a control unit. The configuration of the lower shaft unit 304 and the synchronization mechanism 208 of the sewing device 1 of the third embodiment is different from that of the sewing device 1 of the first embodiment, and other configurations are the same. The synchronization mechanism 208 of the third embodiment is the same as the sewing device 1 of the second embodiment. The synchronization mechanism 208 of the third embodiment does not need to include the attachment portion 144. Hereinafter, description of the same structure as the sewing device 1 of 1st, 2nd embodiment is abbreviate | omitted, and the lower shaft unit 304 different from the sewing device 1 of 1st, 2 embodiment is demonstrated. Explanation of the same members as those of the sewing device 1 of the first and second embodiments is simplified or omitted.

  As shown in FIG. 15, the lower shaft unit 304 of the sewing device 1 of the third embodiment has a idler pulley 342 and the timing belt is a double-tooth belt 347 having internal teeth 345 and external teeth 346. Unlike the lower shaft unit 4, other configurations are the same. The idler pulley 342 is provided above the second pulley 46, and the rotation shaft 343 of the idler pulley 342 is supported by the lower housing 42. Inner teeth 345 of both tooth belts 347 mesh with the outer peripheral portions of the first pulley 45 and idler pulley 342, and outer teeth 346 of both tooth belts 347 mesh with the outer peripheral portion of the second pulley 46. The lower shaft unit 304 converts the left side clockwise rotation of the lower spline shaft 5 into the left side counterclockwise rotation of the conversion shaft 57 by the double-tooth belt 347. Therefore, the lower shaft rotation direction is counterclockwise, and is opposite to the upper shaft rotation direction. When the hook is a full rotation hook, the third embodiment is configured, and when the hook is a half rotation hook, the second embodiment is configured, the synchronization mechanism 208 of the sewing device 1 needs to include the mounting portion 144. There is no.

  When the sewing apparatus 1 according to the third embodiment performs a sewing operation, the control unit drives the synchronization mechanism 208 to rotate the upper spline shaft 3 and the lower spline shaft 5 clockwise in a left side view. The lower shaft unit 304 transmits the clockwise rotation of the lower spline shaft 5 when viewed from the left side to the lower shaft 44 via the first pulley 45, the second pulley 46, and both toothed belts 347, and the lower shaft rotation direction is changed to the upper shaft. Reverse the direction of rotation.

  The sewing device 1 of the first to third embodiments is an example of the sewing device of the present invention. The upper shaft unit 2, the upper spline shaft 3, the lower spline shaft 5, the X moving mechanism 6, and the Y moving mechanism 7 are the upper shaft unit, upper spline shaft, lower spline shaft, X moving mechanism, and Y moving mechanism of the present invention. It is an example. The lower shaft units 4, 204, and 304 are examples of the lower shaft unit of the present invention. The synchronization mechanisms 8 and 208 are examples of the synchronization mechanism of the present invention. The hook tips 11, 211 are examples of the hook tip of the present invention. The hooks 12 and 212 are examples of the hook of the present invention. The hook mechanisms 41 and 241 are examples of the hook mechanism of the present invention. The lower housings 42 and 242 are examples of the housing and the lower housing of the present invention. The conversion mechanisms 43 and 143 are examples of the conversion mechanism of the present invention. The fixing parts 51 and 52 are examples of the fixing part of the present invention. The first pulley 45, the second pulley 46, and the timing belt 47 are examples of the first pulley, the second pulley, and the timing belt of the present invention. The conversion shaft 57, the first gear 58, and the second gear 59 are examples of the conversion shaft, the first gear, and the second gear of the present invention. The conversion shaft 157, the first gear 158, the second gear 160, the intermediate shaft 159, and the swing mechanism 168 are examples of the conversion shaft, the first gear, the second gear, the intermediate shaft, and the swing mechanism of the present invention. The needle bar mechanism 21 and the upper housing 22 are examples of the needle bar mechanism and the upper housing of the present invention. The belt 72 is an example of the belt of the present invention.

  The relative positions of the lower shaft units 4 and 204 in the sewing device 1 in the front-rear direction perpendicular to the moving direction are determined by the rail 69 and the lower spline shaft 5. Therefore, the lower shaft units 4, 204, and 304 are not easily affected by vibrations in the front-rear direction. The lower shaft units 4, 204, and 304 can change the relative positions of the sewing device 1 in the front-rear direction. Therefore, the lower shaft units 4, 204, 304 may be affected by vibrations in the moving direction of the lower shaft units 4, 204. In the sewing device 1 and the lower shaft units 4 and 304, the shuttle 12 rotates around a vertical axis 15 perpendicular to the axis 14 of the lower spline shaft 5. In the sewing device 1 and the lower shaft unit 204, the hook 212 rotates around a vertical axis 225 perpendicular to the axis 14 of the lower spline shaft 5. The rotation trajectories of the hook sword tips 11 and 211 are on a vertical plane extending in the extending direction (left-right direction) of the lower spline shaft 5. The moving direction of the lower shaft units 4 and 204 and the extending direction of the surface including the rotation locus of the hook sword tips 11 and 211 coincide. Therefore, even when the lower shaft units 4 and 204 are subjected to vibration in the direction parallel to the lower spline shaft 5 (left and right direction), the sewing apparatus 1 is far from the sewing needle 23 and the hook sword tips 11 and 211 as compared with the conventional sewing apparatus. Is difficult to vary.

  The sewing device 1 is connected to the needle bar mechanism 21, and includes an upper shaft 25 provided in parallel with the upper spline shaft 3 and a transmission member 26 that transmits the rotation around the axis of the upper spline shaft 3 to the upper shaft 25. Therefore, the sewing apparatus 1 does not need to convert the rotational force around the axis of the upper spline shaft 3 into the rotational force in the direction parallel to the vertical shafts 15 and 225 (front-rear direction) by the upper shaft unit 2. Therefore, the sewing apparatus 1 can simplify the configuration of the upper shaft unit 2 as compared with the case where the rotational force around the axis of the upper spline shaft 3 is converted into a direction parallel to the vertical shafts 15 and 225. The sewing apparatus 1 is easy to maintain and manage for synchronizing the upper shaft 25 and the lower shaft 44.

  The sewing apparatus 1 includes a Y moving mechanism 7 that moves a sewing object relative to the lower shaft units 4 (304) and 204 in the extending direction (front-rear direction) of the vertical shafts 15 and 225. The sewing apparatus 1 can move the sewing object relative to the lower shaft units 4 (304) and 204 by the X moving mechanism 6 and the Y moving mechanism 7. Since the sewing machine 1 has the upper shaft unit 2 and the lower shaft units 4 (304) and 204 as separate bodies, it is easy to design the size of the sewing device 1 according to the size of the sewing object.

  The X moving mechanism 6 of the sewing apparatus 1 is configured to remove the belt 72 that moves in the extending direction (left and right direction) of the axis 14 of the lower spline shaft 5 and one end and the other end of the belt 72 to the lower casings 42 and 242. Fixing portions 51 and 52 that can be fixed are provided. When the lower shaft units 4, 204, 304 are defective, the sewing apparatus 1 can easily replace the lower shaft units 4, 204 by removing the fixing portions 51, 52 from one end and the other end of the belt 72.

  The conversion mechanism 43 of the sewing device 1 of the first and third embodiments includes a conversion shaft 57 extending in parallel with the lower spline shaft 5, a first gear 58 provided on the conversion shaft 57, and a first gear 58 that meshes with the first gear 58. A double gear 59 is provided. The lower shaft unit 4 includes a first pulley 45 connected to the lower spline shaft 5, a second pulley 46 provided on the conversion shaft 57, and a timing belt 47 spanned between the first pulley 45 and the second pulley 46. The second gear 59 is provided on the lower shaft 44. If the sewing device 1 releases the connection between the first pulley 45 of the lower shaft unit 4 and the lower spline shaft 5 of the sewing device 1, the lower shaft unit 4 can be easily detached from the sewing device 1. Therefore, the sewing apparatus 1 can easily replace the lower shaft unit 4. The sewing device 1 according to the first embodiment is provided in the synchronization mechanism 8 outside the lower shaft unit 4 so that the rotation direction of the upper shaft 25 viewed from the left side and the rotation direction of the lower shaft 44 viewed from the front side are reversed. Therefore, the sewing apparatus 1 can reduce the size of the lower casing 42 and reduce the weight of the lower casing 42 compared with the case where the configuration in which the rotation direction is reversed is provided in the lower shaft unit 4. The sewing device 1 of the third embodiment requires a shorter length of both tooth belts for changing the upper shaft rotation direction and the lower shaft rotation direction than the sewing device 1 of the first embodiment.

  The conversion mechanism 143 of the sewing device 1 of the second embodiment includes a conversion shaft 157 extending in parallel with the lower spline shaft 5, a first gear 158 provided on the conversion shaft 157, and a second gear 160 that meshes with the first gear 158. . The lower shaft unit 204 includes a first pulley 45 connected to the lower spline shaft 5, a second pulley 46 provided on the conversion shaft 157, and a timing belt 47 spanned between the first pulley 45 and the second pulley 46. The second gear 160 is provided on an intermediate shaft 159 provided in parallel with the lower shaft 44. The sewing apparatus 1 includes a swing mechanism 168 that converts the rotation of the intermediate shaft 159 in one direction into the reciprocating rotation of the lower shaft 44. If the sewing device 1 releases the connection between the first pulley 45 of the lower shaft unit 204 and the lower spline shaft 5 of the sewing device 1, the lower shaft unit 204 can be easily detached from the sewing device 1. Therefore, the sewing apparatus 1 can easily replace the lower shaft unit 204.

  The present invention can be variously modified in addition to the above embodiment. The sewing device 1 of the above embodiment can also be applied to a sewing device that forms various stitches such as main stitching, tacking, staggered stitching, hole hoisting, buttoning, and the like. The sewing device may not include the Y moving mechanism. The sewing device may not be able to remove at least one of the upper shaft unit and the lower shaft unit. The configurations of the lower shaft unit and the upper shaft unit may be changed as appropriate. For example, the lower shaft units 4, 204, and 304 may be provided with an insertion hole through which the lower spline shaft 5 is inserted in the fixed portion, similarly to the upper shaft unit 2. Similarly to the upper shaft unit 2, the lower shaft units 4 and 204 may be provided with a support member 55 that engages with the rail on the back surface. The lower shaft unit may omit the fixing portions 51 and 52. One end and the other end of the belt 72 may not be fixed by the fixing portions 51 and 52. The configuration, arrangement, size, number, and the like of the fixing portions 51 and 52 may be changed as appropriate. You may change suitably the kind of hook which a lower axis unit has. When the hook is a full rotation hook, the upper shaft rotation direction and the lower shaft rotation direction may be the same. The hour sewing device does not require a configuration in which the lower shaft rotation direction is opposite to the upper shaft rotation direction. The upper shaft unit 2 may be provided with an insertion hole through which the upper spline shaft 3 is inserted in the main body 27, similarly to the lower shaft units 4 and 204. Similarly to the lower shaft units 4, 204, and 304, the upper shaft unit 2 may be provided with a support member 34 that engages with the rail on the upper surface. The upper shaft of the upper shaft unit may be perpendicular to the upper spline shaft and the needle bar. At this time, the upper shaft unit may be provided with a conversion mechanism similar to that of the lower shaft unit. The diameter of the idler pulley 138 may be larger than the diameters of the upper pulley 134 and the lower pulley 135. Instead of the idler pulley 138, the pulleys 140 and 141 may be capable of adjusting the tension of the both tooth belts 139.

DESCRIPTION OF SYMBOLS 1 Sewing apparatus 2 Upper shaft unit 3 Upper spline shaft 4, 204, 304 Lower shaft unit 5 Lower spline shaft 6 X movement mechanism 7 Y movement mechanism 8, 208 Synchronous mechanism 11, 211 Hook tip 12, 212 Hook 14 Axis 15, 225 Vertical shaft 21 Needle bar mechanism 22 Upper housing 23 Sewing needle 24 Needle bar 25 Upper shaft 26 Transmission member 41, 241 Hook mechanism 42, 242 Lower housing 43, 143 Conversion mechanism 44 Lower shaft 45 First pulley 46 Second pulley 47 Timing belt 48, 49, 248, 249 Insertion hole 51, 52 Fixing portion 57, 157 Conversion shaft 58, 158 First gear 59, 160 Second gear 159 Intermediate shaft 72 Belt 75 Transmission member 168 Swing mechanism

Claims (10)

A lower shaft of the sewing device having a hook mechanism for driving a hook having a hook sword tip on the outer periphery and a housing for housing the hook mechanism, and moving the housing along the axial direction of the lower spline shaft of the sewing device In the unit
An insertion hole for inserting the lower spline shaft into the housing;
The rotational force around the axis of the lower spline shaft inserted through the insertion hole is converted into the rotational force around the vertical axis perpendicular to the extending direction of the needle bar of the sewing device and the axis of the lower spline shaft. A conversion mechanism;
A lower shaft unit comprising: the conversion mechanism and a lower shaft connected to the hook mechanism and rotating the hook about the vertical axis.   The lower shaft unit according to claim 1, further comprising a fixing portion that fixes one end and the other end of a belt that moves in the extending direction of the axis of the lower spline shaft. The conversion mechanism is
A conversion axis extending parallel to the lower spline axis;
A first gear provided on the conversion shaft;
A second gear meshing with the first gear;
The lower shaft unit is
A first pulley coupled to the lower spline shaft;
A second pulley provided on the conversion shaft;
A timing belt spanned between the first pulley and the second pulley;
The lower shaft unit according to claim 1, wherein the second gear is provided on the lower shaft. The conversion mechanism is
A conversion axis extending parallel to the lower spline axis;
A first gear provided on the conversion shaft;
A second gear meshing with the first gear;
The lower shaft unit is
A first pulley coupled to the lower spline shaft;
A second pulley provided on the conversion shaft;
A timing belt spanned between the first pulley and the second pulley;
The second gear is provided on an intermediate shaft provided in parallel with the lower shaft,
The lower shaft unit according to claim 1, further comprising a swing mechanism that converts a rotation of the intermediate shaft in one direction into a reciprocating rotation of the lower shaft. An upper shaft unit having a needle bar mechanism that moves up and down a needle bar equipped with a sewing needle, and an upper housing that houses the needle bar mechanism;
An upper spline shaft that is inserted into the upper housing of the upper shaft unit and transmits power to the needle bar mechanism;
A hook mechanism that drives a hook having a hook sword tip on the outer periphery, and a lower shaft unit having a lower housing that houses the hook mechanism;
A lower spline shaft that extends parallel to the upper spline shaft, passes through the lower housing of the lower shaft unit, and transmits power to the shuttle mechanism;
A synchronization mechanism that spans the upper spline shaft and the lower spline shaft, and synchronizes the rotation of the upper spline shaft and the lower spline shaft;
An X moving mechanism that moves the upper shaft unit along the axial direction of the upper spline shaft, and moves the lower shaft unit along the axial direction of the lower spline shaft in synchronization with the movement of the upper shaft unit; In the sewing device provided,
A conversion mechanism that converts a rotational force around the axis of the lower spline shaft into a rotational force around a vertical axis perpendicular to the extending direction of the needle bar and the axis of the lower spline shaft;
A sewing apparatus comprising: the conversion mechanism; and a lower shaft that is connected to the hook mechanism and rotates the hook about the vertical axis. An upper shaft connected to the needle bar mechanism and provided in parallel with the upper spline shaft;
The sewing apparatus according to claim 5, further comprising a transmission member that transmits rotation of the upper spline shaft around the axis to the upper shaft.   The sewing apparatus according to claim 5, further comprising a Y moving mechanism that moves a sewing target relative to the lower shaft unit in an extending direction of the vertical shaft. The X moving mechanism is
A belt that moves in the extending direction of the axis of the lower spline shaft;
The sewing apparatus according to any one of claims 5 to 7, further comprising a fixing portion that detachably fixes one end and the other end of the belt to the lower housing. The conversion mechanism is
A conversion axis extending parallel to the lower spline axis;
A first gear provided on the conversion shaft;
A second gear meshing with the first gear;
The lower shaft unit is
A first pulley coupled to the lower spline shaft;
A second pulley provided on the conversion shaft;
A timing belt spanned between the first pulley and the second pulley;
The sewing apparatus according to claim 5, wherein the second gear is provided on the lower shaft. The conversion mechanism is
A conversion axis extending parallel to the lower spline axis;
A first gear provided on the conversion shaft;
A second gear meshing with the first gear;
The lower shaft unit is
A first pulley coupled to the lower spline shaft;
A second pulley provided on the conversion shaft;
A timing belt spanned between the first pulley and the second pulley;
The second gear is provided on an intermediate shaft provided in parallel with the lower shaft,
The sewing apparatus according to any one of claims 5 to 8, further comprising a swinging mechanism that converts rotation in one direction of the intermediate shaft into reciprocating rotation of the lower shaft.

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