sewing machine

Abstract

To provide a sewing machine that allows for easy and appropriate adjustment of the distance between a protruding part and a recessed part. [Solution] The sewing machine comprises a frame 7, a bobbin mechanism 12, a bobbin stopper 100, an adjustment mechanism 90, and a display unit. The bobbin mechanism 12 has an outer bobbin 81 and an inner bobbin 82. The inner bobbin 82 has a bobbin stopper groove 820. The bobbin stopper 100 has a projection 109. The projection 109 can engage with the bobbin stopper groove 820. The adjustment mechanism 90 can adjust the bobbin stopper distance between the projection 109 and the bottom surface 826 of the bobbin stopper groove 820. The adjustment mechanism 90 has an operating dial 92, a moving part 91, and a potentiometer. The moving part 91 moves the projection 109 left and right according to the amount and direction of rotation of the operating dial 92. The potentiometer outputs a voltage according to the amount and direction of rotation of the operating dial 92. The display unit displays the bobbin stopper distance based on the amount and direction of rotation of the operating dial 92.

Description

Technical Field

[0001] The present invention relates to a sewing machine.

Background Art

[0002] The full-rotation vertical shuttle of the sewing machine described in Patent Document 1 includes an outer shuttle and an inner shuttle. The outer shuttle is rotated by a shuttle drive shaft. The inner shuttle is arranged inside the outer shuttle and is rotatable relative to the outer shuttle. The inner shuttle accommodates a bobbin thread. A recess is disposed on the outer peripheral portion of the inner shuttle. An engagement protrusion for restricting rotation of the inner shuttle engages with the recess. The sewing machine captures the upper thread passed through the sewing needle with the outer shuttle, and entangles the upper thread with the bobbin thread held by the stopped inner shuttle to perform sewing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of Invention

Problems to be Solved by the Invention

[0004] In the full-rotation vertical shuttle described above, the upper thread entangled with the bobbin thread passes through the recess and forms a stitch together with the bobbin thread. Accordingly, there is a gap between the engagement protrusion and the recess. In order for the upper thread to pass through the gap and for the engagement protrusion to restrict the rotation of the inner shuttle, the distance between the engagement protrusion and the recess needs to be appropriate. Conventionally, since a sewing machine operator visually adjusts the distance between the engagement protrusion and the recess, it has been difficult to properly adjust the distance between the engagement protrusion and the recess.

[0005] An object of the present invention is to provide a sewing machine that can easily and properly adjust the distance between the protrusion and the recess.

Means for Solving the Problems

[0006] The sewing machine according to the present invention comprises a frame, a bobbin mechanism disposed on the frame for capturing the upper thread through which a sewing needle is inserted and entangling it with the lower thread, an outer bobbin including a pointed tip capable of capturing the upper thread and rotatable around the axis of a bobbin shaft extending in a first direction perpendicular to the vertical direction, and an inner bobbin for storing the lower thread and rotatable inside the outer bobbin relative to the outer bobbin and around the axis of the bobbin shaft, the inner bobbin including a recess that is recessed in the first direction, a bobbin stopper including a projection that extends in the first direction and is capable of engaging with the recess, an adjustment mechanism disposed on the frame for adjusting the distance between the projection and the recess in the first direction, an operating dial rotatable around the axis of a rotating shaft extending in a second direction, a moving part that moves the projection in the first direction according to the amount and direction of rotation of the operating dial, and a sensor for detecting the amount and direction of rotation, and a display unit that displays based on the amount and direction of rotation detected by the sensor.

[0007] The sewing machine allows the operator to position the protrusions as desired by rotating the control dial while checking the display. Therefore, the sewing machine can easily adjust the distance between the protrusions and recesses in the first direction.

[0008] In the present invention, the second direction is perpendicular to the first direction, and the movable part may have an eccentric part that extends in the second direction, is eccentric to the rotation axis and positioned on the operating dial, and rotates in accordance with the rotation of the operating dial, and a fixing plate that is movable in the first direction relative to the frame, and the fixing plate includes a fixing part that fixes the bobbin stopper and a fitting part that fits with the eccentric part. The sewing machine can move the projection in the first direction with a simple configuration.

[0009] In the present invention, the movable part may further include a first restricting part positioned at the eccentric part that restricts the movement of the fixed plate in the second direction. The sewing machine can suppress the movement of the fixed plate in the second direction.

[0010] In the present invention, the moving part may further include a frame axis extending in the second direction, coaxial with the rotation axis, and rotatably disposed on the frame, and a second restricting part disposed on the frame axis for restricting the movement of the operating dial in the second direction. The sewing machine can suppress the movement of the operating dial in the second direction.

[0011] In the present invention, the adjustment mechanism may further include a switching unit that allows switching between a state in which the fixing plate is movable in the first direction and a state in which the fixing plate is not movable in the first direction. The sewing machine can switch between a state in which the fixing plate is movable in the first direction and a state in which the fixing plate is not movable in the first direction by the switching unit.

[0012] In the present invention, the display unit may show the distance between the projection and the recess in the first direction. By checking the display unit, the sewing machine operator can easily adjust the distance between the projection and the recess in the first direction appropriately. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of sewing machine 1. [Figure 2] This is a perspective view of the head 24 and frame 7. [Figure 3] This is a perspective view of frame 7. [Figure 4] Perspective view of boiler unit 8. [Figure 5] This is a perspective view of the boiler unit 8, viewed from a different direction than Figure 4. [Figure 6] This is a perspective view of the rotary boiler 80, bobbin 89, and bobbin case 88. [Figure 7] This is a disassembled perspective view of the 80mm rotary boiler. [Figure 8] This is a perspective view of the adjustment mechanism 90, the boiler stopper 100, and the boiler mechanism 12. [Figure 9] This is an exploded perspective view of the adjustment mechanism 90 and the boiler stopper 100. [Figure 10] This is a perspective view of the operating dial 92 and the shaft portion 93. [Figure 11] It is a front view of the detection unit 99. [Figure 12] It is a perspective view of the fixed plate 98. [Figure 13] It is a perspective view of the hook stop portion 100. [Figure 14] It is a block diagram showing the electrical configuration of the sewing machine 1. [Figure 15] It is a timing chart when adjusting the hook stop interval. [Modes for Carrying Out the Invention]

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The referenced drawings are used to describe the technical features that the present invention can adopt. The configuration of the apparatus described in the drawings is not intended to be limited thereto, and is merely an illustrative example. In the following, the upper left, lower right, lower left, upper right, upper, and lower sides of Fig. 1 are respectively defined as the left, right, front, rear, upper, and lower sides of the sewing machine 1.

[0015] The configuration of the sewing machine 1 will be described with reference to Fig. 1 to Fig. 13. The sewing machine 1 is a portal sewing machine capable of sewing a workpiece (not shown). The sewing machine 1 includes a bed portion 21, a feed mechanism 25, pillar portions 221 and 222, a beam portion 23, an operation portion 27, a head portion 24, and a frame 7.

[0016] As shown in Fig. 1, the bed portion 21 has a base portion 211 and a frame body 212. The base portion 211 is box-shaped. The frame body 212 is a lattice-shaped structure. The frame body 212 supports the base portion 211 from below.

[0017] The base portion 211 includes holding plates 213, 214, bellows 215, 216, a first rail and a second rail (not shown), and rails 75, 76 shown in Fig. 2. The base portion 211 has openings 217, 218 that open upward in the base portion 211.

[0018] The retaining plate 213 is located at the upper end of the base 211 and has thickness in the vertical direction. The retaining plate 214 is positioned in front of the retaining plate 213 and has thickness in the vertical direction. The upper end of the retaining plate 214 is at the same position as the upper end of the retaining plate 213 in the vertical direction.

[0019] Opening 217 is located at the left end of the retaining plate 213. Opening 218 is located at the right end of the retaining plate 213. Openings 217 and 218 extend in the front-to-back direction. Bellows 215 covers opening 217. Bellows 216 covers opening 218. Bellows 215 and 216 are expandable and contractible in the front-to-back direction.

[0020] The first rail, the second rail, and rails 75 and 76 are housed in the base 211. The first rail is located inside the opening 217. The second rail is located inside the opening 217. The first and second rails extend in the front-rear direction. Rails 75 and 76 are located below the retaining plate 213 and are positioned between the opening 217 and the opening 218 in the left-right direction. Rails 75 and 76 extend in the left-right direction.

[0021] The feeding mechanism 25 includes a holding mechanism 26 and connecting parts 251 and 252. The holding mechanism 26 is capable of holding the workpiece. The holding mechanism 26 includes an upper frame 260, a lower frame 261, and air cylinders 262 and 263.

[0022] The upper frame 260 and the lower frame 261 are rectangular frames in plan view. The upper frame 260 is located above the lower frame 261. The upper frame 260 can hold the workpiece between itself and the lower frame 261. Air cylinders 262 and 263 move the upper frame 260 in the vertical direction.

[0023] The connecting sections 251 and 252 are structures that extend in the left-right direction. The left end of connecting section 251 is connected to the first rail. The right end of connecting section 251 is connected to the left end of the holding mechanism 26. The right end of connecting section 252 is connected to the second rail. The left end of connecting section 252 is connected to the right end of the holding mechanism 26.

[0024] The leg sections 221 and 222 are rectangular prisms extending vertically. Leg section 221 extends upward from the left end of the base 211. Leg section 221 is located to the left of the bellows 215. Leg section 221 houses a synchronization mechanism (not shown).

[0025] The leg column 222 extends upward from the right end of the base 211. The leg column 222 is located to the right of the bellows 216. The leg column 221 and the leg column 222 are aligned in the left-right direction and are located in front of the center of the base 211 in the front-rear direction. The leg column 222 houses the X motor 132 shown in Figure 14.

[0026] As shown in Figures 1 and 2, the beam section 23 is spanned between the column sections 221 and 222. The beam section 23 has a housing 231, rails 233 and 234, and a bellows 232. The housing 231 is box-shaped and extends in the left-right direction. The housing 231 is open to the front and bottom. The housing 231 is connected to the upper end of the column section 221 and the upper end of the column section 222. The housing 231 is connected to the rear end of the column section 221 and the rear end of the column section 222.

[0027] Rails 233 and 234 are housed in the housing 231 and extend in the left-right direction. The left ends of rails 233 and 234 are connected to the leg column 221. The right ends of rails 233 and 234 are connected to the leg column 222. Rail 233 is positioned above rail 234. Rails 233 and 234 support the head 24, which will be described later, so that it can move in the left-right direction.

[0028] The bellows 232 is positioned across the front ends of the leg sections 221 and 222, and the housing 231, as well as across both the left and right ends of the head section 24. The bellows 232 covers the rails 233 and 234 from the front. The bellows 232 is expandable and contractible in the left and right directions.

[0029] The control unit 27 is fixed forward at the left end of the beam section 23. The control unit 27 includes a switch group 28 and a display unit 29. The switch group 28 receives various instructions according to the operator's operation of the sewing machine 1. The display unit 29 is a liquid crystal display and can display various images.

[0030] The head unit 24 is positioned in front of the beam unit 23. The head unit 24 is guided by rails 233 and 234 and is movable in the left-right direction. The head unit 24 includes a needle bar 31, a drive unit 50, a presser foot 32, a balance beam 33, a thread tension device 34, a secondary thread tensioner 35, and thread guides 36 and 37.

[0031] The needle bar 31 extends vertically, and a sewing needle 30 can be attached to its lower end. The drive unit 50 has a main shaft 52, a main motor 131 as shown in Figure 2, and a knob 51. The main shaft 52 extends horizontally. The left end of the main shaft 52 is connected to the needle bar 31. The main shaft 52 rotates under the drive of the main motor 131, causing the needle bar 31 to reciprocate vertically. The knob 51 is connected to the right end of the main shaft 52. The knob 51 is rotated manually by the operator.

[0032] The presser foot 32 holds the workpiece from above. The presser foot 32 has a through hole. The sewing needle 30 passes through the through hole in the presser foot 32 as the needle bar 31 moves up and down. The balance lever 33 operates as the needle bar 31 moves up and down, pulling up the upper thread.

[0033] The thread tension device 34 adjusts the tension of the upper thread (not shown). The auxiliary thread tensioner 35 is located above the thread tension device 34. The auxiliary thread tensioner 35 wraps around the upper thread extending from a spool (not shown) and guides the upper thread toward the thread tension device 34. The thread guides 36 and 37 each contact the upper thread extending from the thread tension device 34 and guide the upper thread toward the balance beam 33.

[0034] As shown in Figures 2, 3, and 9, the frame 7 is located below the head 24. The frame 7 is housed in the base 211. The frame 7 includes a housing 70, a needle plate 74, legs 71 and 72, a bobbin unit 8, an adjustment mechanism 90, and a bobbin stopper 100.

[0035] The housing 70 houses the boiler unit 8. The housing 70 has a main section 701, a frame 702, a recess 708, and protrusions 703 and 721. The main section 701 is box-shaped. The frame 702 is positioned to the left of the main section 701. The frame 702 is box-shaped and opens to the front and top.

[0036] As shown in Figure 9, the recess 708 is a portion recessed forward from the rear end at the left end of the main portion 701. The recess 708 extends to the right from the left end of the main portion 701 to the center of the main portion 701 in the left-right direction. The recess 708 has a groove 706, two screw holes 707, a circular hole 705, and two circular holes 709.

[0037] This is a recessed portion at the upper end of groove 706, extending forward from the rear end. Groove 706 extends to the right from the left end of recess 708 to the left-right center of recess 708. Two screw holes 707 are located at the left end of recess 708 and below groove 706. The two screw holes 707 are aligned vertically. Two circular holes 709 are aligned horizontally, and through each circular hole 709, the screws that fasten the coupling 800 (described later) to the spool shaft 11 can be adjusted with a screwdriver or the like.

[0038] The circular hole 705 is located to the right of the groove 706. The circular hole 705 is a recessed portion extending forward from the recess 708. The center of the circular hole 705 lies on an axis R extending in the front-to-back direction.

[0039] The protruding portion 703 is positioned to the left of the main portion 701 and is housed in the frame 702. The protruding portion 703 is plate-shaped with thickness in the left-right direction. The protruding portion 703 has a hole 704. The hole 704 penetrates the protruding portion 703 in the left-right direction and communicates with the internal space of the main portion 701.

[0040] The projection 721 is positioned forward of the left end of the main part 701. The projection 721 is located below the recess 708. The projection 721 is plate-shaped, having thickness in the vertical direction and extending in the horizontal direction. The projection 721 has two screw holes 722 that are recessed to the rear from the front end of the projection 721. The two screw holes are aligned in the horizontal direction.

[0041] A box 73 is fixed above the protrusion 721. The front end of the box 73 is located in front of the front end of the protrusion 721. The box 73 extends in the vertical direction. The box 73 is open to the rear. The box 73 covers the right side of the recess 708 from the front.

[0042] The front wall of box 73 has a circular hole 730. The circular hole 730 penetrates the front wall of box 73 vertically and communicates with the internal space of box 73. The circular hole 730 is located at the upper end of box 73. The center of the circular hole 730 lies on axis R.

[0043] The needle plate 74 is detachably fixed above the frame 702. The needle plate 74 has a needle hole. The needle hole is located below the needle bar 31. The sewing needle 30 passes through the needle hole of the needle plate 74 as the needle bar 31 moves up and down.

[0044] Leg 71 supports the rear end of the main body 701 from below. Leg 71 is supported by rail 75 so as to be movable in the left-right direction. Leg 72 supports the front end of the main body 701 from below. Leg 72 is supported by rail 76 so as to be movable in the left-right direction.

[0045] Frame 7 moves from side to side as its legs 71 and 72 are guided along rails 75 and 76. Frame 7 moves from side to side by the drive of the X motor 132. The head 24 shown in Figure 1 also moves from side to side in sync with frame 7 by the drive of the X motor 132.

[0046] As shown in Figure 4, the boiler unit 8 has a boiler shaft 11 and a boiler mechanism 12. The boiler shaft 11 extends in the left-right direction. The boiler shaft 11 is rotatably supported by the housing 70. The axis of the boiler shaft 11 lies on axis C, which extends in the left-right direction. The boiler shaft 11 is rotatable around axis C. Axis C is perpendicular to axis R.

[0047] A boiler shaft pulley 87 is fixed to the right end of the boiler shaft 11. The boiler shaft pulley 87 is located outside the housing 70. The drive shaft of the main motor 131 shown in Figure 2 is connected to the motor pulley 15. A belt 16 is stretched between the boiler shaft pulley 87 and the motor pulley 15. The belt 16 is tensioned by a tensioner 17. When the main motor 131 is driven, the motor pulley 15 rotates, and the boiler shaft 11 rotates around its axis via the belt 16. The main shaft 52 shown in Figure 1 also rotates when driven by the main motor 131, similar to the boiler shaft 11.

[0048] As shown in Figures 4 to 7, the boiler mechanism 12 has a coupling 800 and a full-rotation boiler 80. The coupling 800 is cylindrical and extends in the left-right direction, through which the boiler shaft 11 is inserted. The coupling 800 is inserted through the hole 704 of the protruding portion 703. The coupling 800 functions as a bearing for the housing 70. The left end of the boiler shaft 11 protrudes to the left of the coupling 800.

[0049] The full-rotation bobbin 80 is fixed to the left end of the bobbin shaft 11. The full-rotation bobbin 80 is a full-rotation vertical bobbin in which the rotation axis of the bobbin 89 shown in Figure 6 is positioned perpendicular to the direction of movement of the needle bar 31. The full-rotation bobbin 80 has an outer bobbin 81, an inner bobbin 82, engaging parts 83 and 84, and a bobbin case 88. In the following, the structure of the full-rotation bobbin 80 will be described based on the state shown in Figure 6.

[0050] As shown in Figure 7, the outer pot 81 has a fixing part 811, a bottom plate 812, and side plates 813. The fixing part 811 is cylindrical and extends in the left-right direction. The fixing part 811 is fixed to the left end of the pot shaft 11 with a set screw.

[0051] The base plate 812 is positioned at the left end of the fixing part 811. The base plate 812 is a disc shape with thickness in the left-right direction. The center of the base plate 812 lies on axis C.

[0052] The side plate 813 extends to the left from the edge of the bottom plate 812. The side plate 813 has a plurality of screw holes 814, 815, a notch 816, and a pointed tip 810. The plurality of screw holes 814 and 815 are threaded radially into the side plate 813 around axis C. The plurality of screw holes 814 are located in front of the center of the outer pot 81 in the front-to-back direction. The plurality of screw holes 815 are located behind the center of the outer pot 81 in the front-to-back direction.

[0053] The notch 816 cuts out the upper end of the side plate 813 from the left end to the right end. The tip 810 extends in the circumferential direction around axis C. The tip of the tip 810 is pointed. The tip 810 defines a portion of the notch 816.

[0054] During the sewing process by the sewing machine 1, the bobbin case 81 rotates around axis C together with the bobbin shaft 11, driven by the main motor 131. As the bobbin case 81 rotates, the tip 810 catches the upper thread that is inserted into the sewing needle 30.

[0055] The inner pot 82 is located inside the outer pot 81. The inner pot 82 has a bottom plate 821, studs 829, and side plates 822. The bottom plate 821 is a disc shape with thickness in the left-right direction. The length of the diameter of the bottom plate 821 is shorter than the length of the diameter of the bottom plate 812. The center of the bottom plate 821 is on axis C.

[0056] The stud 829 extends to the left from the center of the base plate 821. That is, the stud 829 is on axis C. The stud 829 rotatably supports the bobbin 89. The bobbin 89 is wound with lower thread (not shown). The bobbin case 82 houses the lower thread by having the stud 829 support the bobbin case 88.

[0057] The side plate 822 extends to the left from the edge of the bottom plate 821. The side plate 822 has a rotation stopper 823 for the bobbin case 88, a stopper groove 820, a through groove 825, and a notch 828. The rotation stopper 823 is punched out from the outer surface of the side plate 822 and has a convex shape toward the inside of the side plate 822. When the bobbin case 88 is installed, the rotation stopper 823 is positioned in the cut in the cylindrical part of the bobbin case 88, preventing the bobbin case 88 from rotating.

[0058] The boiler stop groove 820 is a recessed portion extending from the left end to the right at the upper end of the side plate 822. The bottom of the boiler stop groove 820 is defined by the bottom surface 826. The bottom surface 826 is located to the left of the rotation stopper 823.

[0059] The through groove 825 extends rearward from the rear end of the bobbin stop groove 820. The right end of the through groove 825 is in the same position as the right end of the bobbin stop groove 820. The left end of the through groove 825 is located to the right of the left end of the bobbin stop groove 820. The lower thread fed from the bobbin 89 passes through either the bobbin stop groove 820 or the through groove 825. The lower thread that has passed through either the bobbin stop groove 820 or the through groove 825 is entangled with the upper thread.

[0060] The notch 828 is cut out from the left end to the right in the lower rear part of the side plate 822. The inner pot 82 is rotatable around axis C while positioned inside the outer pot 81. Since the inner pot 82 is not fixed to the outer pot 81, it is rotatable around axis C relative to the outer pot 81.

[0061] The engaging portion 83 is plate-shaped and extends circumferentially around axis C. The engaging portion 83 has a plate 831 and a plurality of screws 834. The plate 831 is semi-circular in shape, bulging to the left from its lower end and extending upward. The plurality of screws 834 extend from the plate 831 toward axis C. The screws 834 can be screwed into the screw holes 814 of the outer pot 81. The engaging portion 83 engages with the outer pot 81 when the screws 834 are screwed into the screw holes 814 from the front.

[0062] The engaging portion 84 is plate-shaped and extends circumferentially around axis C. The engaging portion 84 has a plate 841, a flange 842, and a plurality of protrusions 835. The plate 841 is semi-circular in shape, extending upward while bulging to the right from its lower end. The flange 842 extends from the left end of the plate 841 toward axis C.

[0063] Multiple screws 845 extend from the plate 841 toward the axis C. The screws 845 can be screwed into the screw holes 815 of the outer pot 81. The engaging portion 84 engages with the outer pot 81 when the screws 845 are screwed into the screw holes 815 from the rear. The flange 842 prevents the inner pot 82, which is located inside the outer pot 81, from coming loose.

[0064] As shown in Figure 6, the bobbin case 88 is cylindrical with axis C as its center. The bobbin case 88 can be fitted into the bobbin case 82. When the bobbin case 88 is fitted into the bobbin case 82, the bobbin 89 is prevented from coming off the bobbin case 82.

[0065] As shown in Figures 4, 5, and 8-13, the adjustment mechanism 90 has an operating dial 92 and a movable part 91. The operating dial 92 is cylindrical and extends in the front-rear direction. The axis of the operating dial 92 is on axis R. The operating dial 92 has a circular hole 921 that passes through the axis of the operating dial 92.

[0066] The operating dial 92 passes through the circular hole 730 in the box 73. The front end of the operating dial 92 is located outside the box 73. The rear end of the operating dial 92 is located inside the box 73.

[0067] The movable part 91 has a plate 900, a detection part 99, a shaft part 93, a fixing plate 98, and two bolts 805. The plate 900 has thickness in the front-rear direction and extends in the up-down direction. The plate 900 has two holes 902, four screw holes 903, and a circular hole 901.

[0068] The two holes 902 penetrate the lower end of the plate 900 in the front-to-back direction. The two holes 902 are aligned in the left-to-right direction. The plate 900 is fixed to the projection 721 by screwing the bolt 801 into the threaded hole 722 of the projection 721 while it is inserted through the holes 902 from the front.

[0069] The four screw holes 903 penetrate the top of the plate 900 in the front-to-back direction. The four screw holes 903 are located at the vertices of a rectangle extending vertically when viewed from the front. The circular hole 901 penetrates the upper end of the plate 900 in the front-to-back direction. The center of the circular hole 901 lies on axis R. The circular hole 901 is located in front of the operating dial 92.

[0070] As shown in Figures 9 and 11, the detection unit 99 is located behind the plate 900. The detection unit 99 includes a plate 990, a potentiometer 992, and a connector 996. The plate 990 has thickness in the front-to-back direction and extends in the up-to-down direction.

[0071] The plate 990 has a circular hole 998 and four holes 991. The circular hole 998 penetrates the plate 990 in the front-rear direction at the upper end of the plate 990. The center of the circular hole 998 lies on axis R.

[0072] The four holes 991 are located at the vertices of a rectangle extending vertically when viewed from the front. The holes 991 are positioned to overlap with the screw holes 903 of the plate 900 when viewed from the front. A cylindrical spacer 802 is positioned in front of the holes 991. The plate 990 is fixed to the plate 900 by screwing a bolt 803 into the screw holes 903 of the plate 900, with the bolt 803 inserted from the rear through the holes 991 and the spacer 802.

[0073] The potentiometer 992 and connector 996 are located at the front of the board 990. The potentiometer 992 is located at the upper end of the board 990. The potentiometer 992 has a main body 994 and three terminals 995.

[0074] The main body 994 is box-shaped. The main body 994 has a rotating part 999 and an arc-shaped hole 993. The arc-shaped hole 993 penetrates the main body 994 in the front-rear direction. The center of the arc-shaped hole 993 is on axis R and communicates with the circular hole 998.

[0075] The rotating part 999 is positioned on the potentiometer 992 so as to be rotatable around axis R. The direction in which the rotating part 999 of the potentiometer 992 rotates clockwise around axis R when viewed from the front is called rotation direction R1. The direction in which the rotating part 999 of the potentiometer 992 rotates counterclockwise around axis R when viewed from the front is called rotation direction R2.

[0076] The main body 994 houses a variable resistor circuit. Three terminals 995 are connected to the variable resistor circuit. The three terminals 995 protrude downward from the main body 994 and are arranged in a left-right direction. The resistance value between the rightmost and center terminals 995 varies according to the amount and direction of rotation of the rotating part 999 around its axis R. Therefore, when a predetermined voltage is input to the potentiometer 992 from the control unit 120 shown in Figure 14, a voltage corresponding to the amount and direction of rotation of the rotating part 999 around its axis R is output to the control unit 120. Similarly, the resistance value between the leftmost and center terminals 995 varies according to the amount and direction of rotation of the rotating part 999 around its axis R. Therefore, when a predetermined voltage is input to the potentiometer 992 from the control unit 120 shown in Figure 14, a voltage corresponding to the amount and direction of rotation of the rotating part 999 around its axis R is output to the control unit 120.

[0077] Connector 996 has three terminals 997. One end of the three terminals 997 is connected to the three terminals 995 of potentiometer 992. The other end of the three terminals 997 is connected to control unit 120 shown in Figure 14 by a harness (not shown).

[0078] As shown in Figures 4, 5, 9, and 10, the shaft portion 93 has a rotating shaft 931, a disc portion 932, an eccentric shaft 94, and a rotating shaft 95. The rotating shaft 931 extends in the front-rear direction. The axis of the rotating shaft 931 is on axis R. The rotating shaft 931 has an engaging portion 933. The engaging portion 933 is a part whose cross-section perpendicular to the front-rear direction is D-shaped. The engaging portion 933 is arranged from the front end to the rear end of the rotating shaft 931.

[0079] The engaging portion 933 is inserted from the rear through the circular hole 998, the arc-shaped hole 993, the circular hole 901, and the circular hole 921 in that order. The front end of the engaging portion 933 is located slightly behind the front end of the operating dial 92. The engaging portion 933 is fixed to the operating dial 92 and the rotating portion 999 of the potentiometer 992. Therefore, when the operating dial 92 rotates around axis R, the rotating portion 999 also rotates together with it around axis R.

[0080] The disc portion 932 is fixed to the rear end of the rotating shaft 931. The disc portion 932 is located behind the plate 990. The disc portion 932 has thickness in the front-rear direction. The center of the disc portion 932 is on axis R. The length of the diameter of the disc portion 932 is longer than the length of the diameter of the rotating shaft 931.

[0081] The eccentric shaft 94 is fixed to the rear end of the disc portion 932. The eccentric shaft 94 extends in the front-rear direction. The axis of the eccentric shaft 94 is eccentric with respect to axis R. The eccentric shaft 94 has a groove 941. The groove 941 is located in the center of the eccentric shaft 94 in the front-rear direction and extends circumferentially with respect to the axis of the eccentric shaft 94. A retaining ring 96 is fitted into the groove 941.

[0082] The rotating shaft 95 is fixed to the rear end of the eccentric shaft 94. The rotating shaft 95 extends in the front-rear direction. The axis of the rotating shaft 95 is on axis R. The length of the diameter of the rotating shaft 95 is the same as the length of the diameter of the disc portion 932. The rotating shaft 95 has a groove 951. The groove 951 is located in the center of the rotating shaft 95 in the front-rear direction and extends circumferentially with axis R as the center. A rubber O-ring 97 is fitted into the groove 951.

[0083] As shown in Figure 9, the rotating shaft 95 is inserted through the circular hole 705 of the housing 70. The front end of the rotating shaft 95 is in the same position in the front-rear direction as the front end of the circular hole 705. The O-ring 97 restricts the forward movement of the operating dial 92 and prevents the rotating shaft 95 from detaching forward from the circular hole 705.

[0084] As shown in Figures 5, 8, 9, and 12, the fixing plate 98 has thickness in the front-to-back direction and extends in the left-to-right direction. The vertical length of the fixing plate 98 is the same as the vertical length of the recess 708. The left-to-right length of the fixing plate 98 is shorter than the left-to-right length of the recess 708. The front-to-back length of the fixing plate 98 is the same as the front-to-back distance from the front end of the rotating shaft 95 to the groove 941. The fixing plate 98 is fitted into the recess 708.

[0085] The fixing plate 98 has a groove 981, a recess 982, two elongated holes 984, and screw holes 985 and 986. The groove 981 is a recessed portion at the right end of the fixing plate 98, extending downward from the upper end. The groove 981 is open in the front-rear direction. The length of the groove 981 in the left-right direction is the same as the diameter of the eccentric shaft 94.

[0086] The rear end of the eccentric shaft 94 is fitted into the groove 981. The front end of the groove 981 contacts the rear end of the retaining ring 96, and the rear end of the groove 981 contacts the front end of the rotating shaft 95. The retaining ring 96 restricts the forward movement of the fixing plate 98 and prevents the fixing plate 98 from detaching forward from the housing 70.

[0087] The recess 982 is a portion recessed from the front end to the rear at the upper end of the fixing plate 98. The recess 982 extends from the left end of the fixing plate 98 to the right. The right end of the recess 982 is located to the left of the groove 981.

[0088] The two elongated holes 984 are located below the recess 982. The two elongated holes 984 penetrate the fixing plate 98 in the front-to-back direction. The two elongated holes 984 extend in the left-to-right direction and are aligned in the up-to-down direction. When the fixing plate 98 is fitted into the recess 708, the elongated holes 984 are positioned to overlap the screw holes 707 when viewed from the front. The fixing plate 98 is fixed to the housing 70 by screwing the bolt 805 into the screw holes 707 with the bolt 805 inserted through the elongated holes 984 from the front.

[0089] Screw holes 985 and 986 penetrate the fixing plate 98 vertically inside the recess 982. Screw holes 985 and 986 are aligned horizontally. Screw hole 985 is located to the right of screw hole 986.

[0090] As shown in Figures 5, 8, 9, and 13, the boiler stopper 100 is fixed to the fixing plate 98. The boiler stopper 100 has an extension 101 and a fixing part 102. The extension 101 has plates 103 and 104. Plate 103 has thickness in the front-rear direction and extends in the left-right direction. The vertical length of plate 103 is the same as the vertical length of the recess 982. Plate 103 is fitted into the recess 982.

[0091] The plate 103 has a circular hole 105 and an elongated hole 106. The circular hole 105 and the elongated hole 106 penetrate the plate 103 in the front-to-back direction. The circular hole 105 is located at the right end of the plate 103. The elongated hole 106 is located to the left of the circular hole 105. The elongated hole 106 extends in the left-to-right direction. When the plate 103 is fitted into the recess 982, the circular hole 105 overlaps with the screw hole 985 in a front view, and the elongated hole 106 overlaps with the screw hole 986 in a front view.

[0092] One of the two bolts 804 is inserted through the circular hole 105 from the front and screwed into the threaded hole 985. The other of the two bolts 804 is inserted through the elongated hole 106 from the front and screwed into the threaded hole 986. This fixes the plate 103 to the recess 982.

[0093] With the fixing plate 98 not fixed to the housing 70 by the bolts 805, the fixing plate 98 and the plate 103 are guided by the upper and lower walls of the recess 708 of the housing 70 and can move in the left-right direction.

[0094] Plate 104 has thickness in the vertical direction and extends rearward from the upper left end of plate 103. The right end of plate 104 is located to the left of the full-rotation kettle 80. The lower end of plate 104 is in the same position vertically as the upper end of the middle kettle 82.

[0095] The plate 104 has two screw holes 107. The two screw holes 107 are aligned in the front-to-back direction. The two screw holes 107 penetrate the plate 104 in the vertical direction. One of the two screw holes is located at the rear end of the plate 104. The other of the two screw holes is located in the center of the plate 104 in the front-to-back direction.

[0096] The fixing part 102 is positioned below the plate 104. The fixing part 102 has a plate 108 and a projection 109. The plate 108 has thickness in the vertical direction and extends in the front-to-back direction. The length of the plate 108 in the left-to-right direction is the same as the length of the plate 104 in the left-to-right direction. The plate 108 overlaps the plate 104 from below.

[0097] The plate 108 has two circular holes 110. The two circular holes 110 are aligned in the front-to-back direction. The two circular holes 110 penetrate the plate 108 in the vertical direction. One of the two circular holes 110 is located at the rear end of the plate 108, and the other of the two circular holes 110 is located at the front end of the plate 108. With plate 108 overlapping plate 104, the circular hole 110 aligns with the screw hole 107 when viewed from below. The fixing part 102 is fixed to the extension part 101 by screwing the bolt 807 into the screw hole 107 with the bolt inserted through the circular hole 110 from below.

[0098] The projection 109 protrudes to the right from the right edge of the plate 108. The projection 109 is located in the center of the plate 108 in the front-to-back direction. The right edge of the projection 109 is located to the right of the right edge of the plate 104. The projection 109 is in the same position as the kettle stopper groove 820 in the vertical direction.

[0099] The projection 109 can engage with the bobbin stopper groove 820. When the projection 109 engages with the bobbin stopper groove 820, the range of rotation of the bobbin case 82 around axis C is restricted. During the sewing process by the sewing machine 1, the lower thread and upper thread pass through the bobbin stopper groove 820, so there needs to be an appropriate distance between the projection 109 and the bottom surface 826 of the bobbin stopper groove 820. Hereinafter, the distance between the projection 109 and the bottom surface 826 in the left-right direction will be referred to as the bobbin stopper distance.

[0100] Referring to Figure 14, the electrical configuration of the sewing machine 1 will be explained. The control unit 120 of the sewing machine 1 includes a CPU 111, ROM 112, RAM 113, storage device 114, input / output interface (I / O) 115, and drive circuits 121 to 125. The CPU 111 provides overall control over the operation of the sewing machine 1.

[0101] ROM 112 stores programs and other data for executing various processes. RAM 113 temporarily stores various information generated during the execution of various processes. Storage device 114 is non-volatile and stores various setting values. Storage device 114 stores table 116. Table 116 stores the relationship between the voltage input from potentiometer 992 and the amount and direction of movement of the hoist stopper 100.

[0102] The drive circuits 121-125, the switch group 28, and the potentiometer 992 are connected to the I / O 115. Drive circuit 121 is connected to the main motor 131. Drive circuit 121 drives the main motor 131 according to the control command of the CPU 111. Drive circuit 122 is connected to the X motor 132. Drive circuit 122 drives the X motor 132 according to the control command of the CPU 111. Drive circuit 123 is connected to the Y motor 133. Drive circuit 123 drives the Y motor 133 according to the control command of the CPU 111. Drive circuit 124 is connected to the air cylinders 262 and 263. Drive circuit 124 drives the air cylinders 262 and 263 according to the control command of the CPU 111. Drive circuit 125 is connected to the display unit 29. Drive circuit 125 displays various information on the display unit 29, such as the boiler stop interval display described later, according to the control command of the CPU 111.

[0103] The switch group 28 detects various instructions from the operator and outputs the detection result to I / O 115. When the potentiometer 992 receives a detection signal from the CPU 111, it outputs a voltage to I / O 115 corresponding to the amount and direction of rotation of the operation dial 92. The detection signal is, for example, a 5V DC voltage.

[0104] Referring to Figure 15, the procedure for adjusting to the appropriate boiler clamping distance will be described in chronological order. Before adjusting the boiler clamping distance, the worker unscrews the two bolts 805. The fixing plate 98 and the boiler clamping section 100 become movable in the left-right direction.

[0105] The operator performs a first rotation operation on the operating dial 92 of the adjustment mechanism 90 (S11). The first rotation operation is an operation to rotate the operating dial 92 in a direction that narrows the boiler stop distance. In this embodiment, the operator rotates the operating dial 92 in the rotation direction R1.

[0106] Since the eccentric shaft 94 is eccentric with respect to axis R, when the operating dial 92 rotates around axis R, the rotation of the operating dial 92 around axis R is converted into a left-right driving force for the fixing plate 98. The fixing plate 98 moves to the right in accordance with the rotation of the operating dial 92.

[0107] The control unit 120 obtains a voltage from the potentiometer 992 of the adjustment mechanism 90 (S13). In S13, the control unit 120 outputs a detection signal to the potentiometer 992. The potentiometer 992 outputs a voltage to the control unit 120 corresponding to the amount and direction of rotation of the operating dial 92 (S15).

[0108] The control unit 120 derives the size of the boiler spacing based on the voltage obtained from the potentiometer 992 and the table 116 (S17). The control unit 120 outputs a spacing display instruction to the display unit 29 to display the derived size of the boiler spacing on the display unit 29 (S19). The display unit 29 displays the boiler spacing display according to the spacing display instruction (S21). The boiler spacing display shows the size of the boiler spacing.

[0109] When the operator performs the first rotation operation, the projection 109 comes into contact with the bottom surface 826 of the boiler stop groove 820 (S23). The operator operates the switch group 28 to output a calibration instruction to the control unit 120 (S25). The control unit 120 outputs a zero reset instruction to the display unit 29 in response to the calibration instruction (S27). The display unit 29 indicates that the boiler stop spacing is zero (S29).

[0110] The operator performs a second rotation operation on the operation dial 92 (S31). The second rotation operation is an operation to rotate the operation dial 92 in a direction that widens the kettle stopper spacing, and is an operation in the opposite direction of rotation to the first rotation operation. In this embodiment, the operator rotates the operation dial 92 in the rotation direction R2. The fixing plate 98 moves to the left in accordance with the rotation of the operation dial 92, and the projection 109 moves away to the left from the bottom surface 826.

[0111] The control unit 120 obtains a voltage from the potentiometer 992, similar to S13 (S33). The potentiometer 992 outputs a voltage to the control unit 120 corresponding to the amount and direction of rotation of the operating dial 92 (S35).

[0112] The control unit 120 derives the size of the boiler stop spacing based on the voltage obtained from the potentiometer 992 and the table 116 (S37). The control unit 120 outputs a spacing display instruction to the display unit 29 (S39). The display unit 29 displays the boiler stop spacing display according to the spacing display instruction (S41). Since the control unit 120 has calibrated that the size of the boiler stop spacing is zero when the projection 109 is in contact with the bottom surface 826, the correct size of the boiler stop spacing is displayed on the boiler stop spacing display.

[0113] The operator checks the boiler stop spacing display on the display unit 29 and performs a second rotation on the operation dial 92 until the desired boiler stop spacing is achieved. Once the boiler stop spacing is achieved, the operator stops the second rotation. The operator then fixes the fixing plate 98 to the housing 70 (S43). In S43, the operator inserts two bolts 805 through the two elongated holes 984 from the front and screws them into the two screw holes 707. This restricts the lateral movement of the fixing plate 98 and the boiler stop section 100.

[0114] As described above, the sewing machine 1 comprises a frame 7, a bobbin mechanism 12, a bobbin stopper 100, an adjustment mechanism 90, and a display unit 29. The bobbin mechanism 12 has an outer bobbin 81 and an inner bobbin 82. The outer bobbin 81 is rotatable around the axis of the bobbin shaft 11, which extends in the left-right direction. The axis of the bobbin shaft 11 extends in the left-right direction. The inner bobbin 82 is rotatable inside the outer bobbin 81 relative to the outer bobbin 81 and around the axis of the bobbin shaft 11. The inner bobbin 82 has a bobbin stopper groove 820. The bobbin stopper groove 820 is a recessed portion extending to the right from the left end of the side plate 822 of the inner bobbin 82. The bobbin stopper 100 has a projection 109. The projection 109 extends to the right and can engage with the bobbin stopper groove 820. The adjustment mechanism 90 can adjust the bobbin stopper distance between the projection 109 and the bottom surface 826 of the bobbin stopper groove 820. The adjustment mechanism 90 includes an operating dial 92, a moving part 91, and a potentiometer 992. The operating dial 92 is rotatable around an axis R extending in the front-rear direction. The moving part 91 moves the projection 109 left and right according to the amount and direction of rotation of the operating dial 92. The potentiometer 992 outputs a voltage corresponding to the amount and direction of rotation of the operating dial 92. The display unit 29 displays the bobbin stop interval based on the amount and direction of rotation of the operating dial 92 detected by the potentiometer 992. With the sewing machine 1, the operator of the sewing machine 1 can rotate the operating dial 92 while checking the display unit 29, thereby positioning the projection 109 at the desired position. Thus, the sewing machine 1 can easily and appropriately adjust the bobbin stop interval.

[0115] In sewing machine 1, the axis of the bobbin shaft 11 and axis R are perpendicular. The movable part 91 has an eccentric shaft 94 and a fixed plate 98. The eccentric shaft 94 is positioned eccentrically with respect to axis R on the operating dial 92. The eccentric shaft 94 rotates in accordance with the rotation of the operating dial 92. The fixed plate 98 is positioned to be movable in the left-right direction relative to the frame 7. The fixed plate 98 has a recess 982 and a groove 981. The recess 982 fits with the plate 103 and fixes the bobbin stopper 100 via two bolts 804. The groove 981 fits with the eccentric shaft 94. According to sewing machine 1, the rotation of the operating dial 92 around axis R is converted by the eccentric shaft 94 into a left-right driving force for the fixed plate 98. In this way, sewing machine 1 can move the projection 109 in the left-right direction with a simple configuration.

[0116] In sewing machine 1, a retaining ring 96 is positioned on the eccentric shaft 94. The front end of the groove 981 is in contact with the rear end of the retaining ring 96. The retaining ring 96 restricts the forward movement of the fixing plate 98. According to sewing machine 1, the retaining ring 96 can prevent the fixing plate 98 from moving forward.

[0117] In the sewing machine 1, the moving part 91 has a rotating shaft 95 and an O-ring 97. The axis of the rotating shaft 95 is on axis R. The rotating shaft 95 is inserted through a circular hole 705 and is rotatably positioned relative to the frame 7. The O-ring 97 is positioned on the rotating shaft 95. The O-ring 97 restricts the forward movement of the operating dial 92. According to the sewing machine 1, the O-ring 97 can prevent the operating dial 92 from moving forward.

[0118] In sewing machine 1, the adjustment mechanism 90 has two bolts 805. When the two bolts 805 are inserted through the two elongated holes 984 and screwed into the two screw holes 707, the movement of the fixing plate 98 in the left-right direction is restricted. When the two bolts 805 are released, the fixing plate 98 becomes movable in the left-right direction. According to sewing machine 1, the sewing machine 1 can switch between a state in which the fixing plate 98 is movable in the left-right direction and a state in which the fixing plate 98 is not movable in the left-right direction.

[0119] In sewing machine 1, the display unit 29 displays the bobbin stop distance, which is the distance in the left-right direction between the projection 109 and the bottom surface 826 of the bobbin stop groove 820. According to sewing machine 1, the operator can easily and appropriately adjust the bobbin stop distance by checking the display unit 29.

[0120] The present invention can be modified in various ways from the above embodiments. The various modifications described below can be combined in any way as long as they do not create contradictions. In the following description, components that have functions common to the above embodiments are denoted by the same reference numerals and their descriptions are omitted, while different components are described.

[0121] The configuration of sewing machine 1 may be changed as appropriate. The type of sewing machine 1 is not limited to a gantry-type sewing machine; it may be changed as appropriate to various industrial sewing machines, household sewing machines, etc.

[0122] The configuration of the kettle mechanism 12 may be changed as appropriate. The full-rotation kettle 80 may be a vertical full-rotation kettle. The arrangement of the kettle stop groove 820 may be changed as appropriate depending on the configuration of the projection 109. The middle kettle 82 does not have to have a through groove 825. The through groove 825 is not limited to extending rearward from the kettle stop groove 820, but may extend forward from the kettle stop groove 820, for example. The through groove 825 may extend forward and rearward from the kettle stop groove 820, respectively.

[0123] The configuration of the adjustment mechanism 90 may be as appropriate. In the above embodiment, the adjustment mechanism 90 converted the rotation of the operating dial 92 into a driving force in the left-right direction of the fixed plate 98 using an eccentric shaft 94. In contrast, the adjustment mechanism 90 may have a link mechanism instead of an eccentric shaft 94 that converts the rotation of the operating dial 92 into a driving force in the left-right direction of the fixed plate 98. The adjustment mechanism 90 may have a rack and pinion mechanism instead of an eccentric shaft 94 that converts the rotation of the operating dial 92 into a driving force.

[0124] The adjustment mechanism 90 does not necessarily have a retaining ring 96. The adjustment mechanism 90 may, for example, restrict the forward movement of the fixing plate 98 by having a disc portion 932 contact the groove 981 from the front instead of a retaining ring 96.

[0125] The adjustment mechanism 90 does not have to have an O-ring 97. Instead of an O-ring 97, the adjustment mechanism 90 may have a leaf spring. The leaf spring is positioned on the side of the rotating shaft 95 and is constantly biased outward in the radial direction of the shaft R. Instead of an O-ring 97, the adjustment mechanism 90 may have a projection that can engage with the groove 951 when the rotating shaft 95 is inserted through the circular hole 705.

[0126] The adjustment mechanism 90 does not necessarily have to have two bolts 805. The number of bolts 805 may be changed as appropriate depending on the structure of the adjustment mechanism 90. The adjustment mechanism 90 may also be configured to switch the fixing plate 98 to a state where it cannot move in the left-right direction by inserting a pin through the screw hole 707 instead of the bolts 805.

[0127] The configuration of the detection unit 99 may be as appropriate. In the above embodiment, the amount and direction of rotation of the operating dial 92 were detected by a potentiometer 992 with a variable resistance value. In contrast, the detection unit 99 may have, for example, an optical encoder or a magnetic encoder instead of a potentiometer 992.

[0128] The display mode of the display unit 29 may be changed as appropriate. For example, the display unit 29 may display the left-right position of the projection 109 instead of the boiler stop distance.

[0129] Calibration of the boiler stop spacing is not required. In the above embodiment, the boiler stop spacing was calibrated with the projection 109 in contact with the bottom surface 826. In contrast, the boiler stop spacing may be calibrated with the projection 109 at its furthest leftward position from the bottom surface 826.

[0130] The left-right direction is an example of the "first direction" of the present invention. The jack stopper groove 820 is an example of the "recess" of the present invention. The front-rear direction is an example of the "second direction" of the present invention. The shaft R is an example of the "rotating shaft" of the present invention. The potentiometer 992 is an example of the "sensor" of the present invention. The eccentric shaft 94 is an example of the "eccentric part" of the present invention. The recess 982 is an example of the "fixing part" of the present invention. The groove 981 is an example of the "fitting part" of the present invention. The retaining ring 96 is an example of the "first restricting part" of the present invention. The rotating shaft 95 is an example of the "frame shaft" of the present invention. The O-ring 97 is an example of the "second restricting part" of the present invention. The bolt 805 is an example of the "switching part" of the present invention. [Explanation of symbols]

[0131] 1 Sewing machine 7 frames 11 Hook shaft 12. Kettle mechanism 29 Display section 81 Outer pot 82 Medium pot 90 Adjustment mechanism 100 Boiler stopper 109 Protrusion 820 Kettle stopper groove 992 Potentiometer

Claims

1. Frame and, A bobbin mechanism arranged in the frame, which captures the upper thread through which the sewing needle is inserted and entangles it with the lower thread, An outer bobbin, which includes a pointed tip capable of capturing the upper thread, and is rotatable around the axis of a bobbin shaft extending in a first direction perpendicular to the vertical direction, A bobbin for storing the bobbin thread, which is rotatable inside the bobbin case relative to the bobbin case and around the axis of the bobbin shaft, and the bobbin includes a recess that is recessed in the first direction. The kettle mechanism having, A boiler stopper portion including a projection that extends in the first direction and is capable of engaging with the recess, An adjustment mechanism arranged in the frame, which is capable of adjusting the distance between the projection and the recess in the first direction, A control dial that is rotatable around the axis of a rotating shaft extending in a second direction, A moving part moves the projection in the first direction according to the amount and direction of rotation of the operating dial, A sensor for detecting the amount of rotation and the direction of rotation. The adjustment mechanism having, A display unit that displays the amount of rotation and the direction of rotation detected by the sensor. A sewing machine characterized by having the following features.

2. The second direction is perpendicular to the first direction, The aforementioned movable part is An eccentric portion extending in the second direction, positioned eccentrically on the operating dial with respect to the rotation axis, and rotating in accordance with the rotation of the operating dial, A fixing plate arranged to be movable in the first direction relative to the frame, A fixing part for fixing the aforementioned boiler stopper, The fitting portion that fits with the eccentric portion and The fixing plate including A sewing machine according to claim 1, characterized by having the following features.

3. The sewing machine according to claim 2, wherein the moving part further includes a first restricting part disposed in the eccentric part that restricts the movement of the fixing plate in the second direction.

4. The aforementioned movable part is A frame axis extending in the second direction, coaxial with the rotation axis and rotatably positioned on the frame, A second restricting unit is positioned on the frame axis and restricts the movement of the operating dial in the second direction. The sewing machine according to claim 2, further comprising the following:

5. The sewing machine according to claim 2, wherein the adjustment mechanism further includes a switching unit that allows switching between a state in which the fixing plate is movable in the first direction and a state in which the fixing plate is not movable in the first direction.

6. The sewing machine according to claim 1, characterized in that the display unit displays the distance between the projection and the recess in the first direction.

Images