Sewing machine

Abstract

To suppress rattling of a holder and improve position reproducibility.SOLUTION: A sewing machine includes: a head part for driving a needle bar for holding a sewing needle; a bed part for holding a shuttle below the head part; a drive mechanism which has an annular mounting part provided in an outer periphery of the bed part, and which moves the mounting part in the axis line direction of the bed part and in the circumferential direction around an axis line; and a holder detachably mounted on the mounting part, and for holding an object to be sewn. The mounting part includes a V-shaped part to be engaged which has a pair of inclined surfaces opposing in the circumferential direction. The holder includes: an engagement part engaged between the pair of inclined surfaces; and an adjustment part for holding the engagement part so as to adjust the position.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] There is known a sewing machine for sewing a curved sewing object. In Patent Document 1, when sewing a curved brim of a hat, a cylindrical holder for holding the brim in a curved state is attached to the sewing machine, and the holder is rotated around the bobbin base of the sewing machine or linearly moved in the axial direction of the bobbin base, thereby performing sewing along the curved surface of the brim. A technique is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Due to the influence of dimensional errors or the like, rattling may occur in the holder when the curved holder is attached to the sewing machine, or sufficient position reproducibility of the holder with respect to the mounting portion of the sewing machine may not be obtained. Therefore, it is desired to suppress rattling when attaching the holder to the sewing machine and improve position reproducibility.

[0005] An aspect of the present invention aims to suppress rattling of the holder and improve position reproducibility.

Means for Solving the Problems

[0006] According to an aspect of the present invention, a sewing machine includes a head portion that drives a needle bar holding a sewing needle, a bed portion that holds a bobbin below the head portion, and an annular mounting portion provided on the outer periphery of the bed portion. The sewing machine further includes a drive mechanism that moves the mounting portion in the axial direction and the circumferential direction around the axis of the bed portion, and a holder that is detachably attached to the mounting portion and holds a sewing object. The mounting portion has a V-shaped engaged portion having a pair of inclined surfaces facing each other in the circumferential direction, and the holder has an engaging portion that engages between the pair of inclined surfaces and an adjusting portion that holds the engaging portion in a position-adjustable manner.

Advantages of the Invention

[0007] According to an aspect of the present invention, rattling of the holder can be suppressed and position reproducibility can be improved.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Best Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. Also, some components may not be used.

[0010] A local coordinate system is defined for the sewing machine 1. In the embodiment, the local coordinate system defined for the sewing machine 1 is appropriately referred to as the sewing machine coordinate system. The sewing machine coordinate system is defined by an XYZ orthogonal coordinate system. In the embodiment, the positional relationship of each part will be described based on the sewing machine coordinate system. The direction parallel to the X-axis in a predetermined plane is the X-axis direction. The direction parallel to the Y-axis in the predetermined plane orthogonal to the X-axis is the Y-axis direction. The direction parallel to the Z-axis orthogonal to the predetermined plane is the Z-axis direction. The rotational direction or inclination direction centered on the X-axis is the θX direction. The rotational direction or inclination direction centered on the Y-axis is the θY direction. The rotational direction or inclination direction centered on the Z-axis is the θZ direction. Also, in the embodiment, the plane including the X-axis and the Y-axis is appropriately referred to as the XY plane. The XY plane is parallel to the predetermined plane. In the embodiment, it is assumed that the XY plane is parallel to the horizontal plane. The Z-axis direction is the vertical direction. The +Z direction is the upward direction and the -Z direction is the downward direction. Note that the XY plane may be inclined with respect to the horizontal plane.

[0011] [Sewing Machine] FIG. 1 is a perspective view showing an example of the sewing machine 1 according to the present embodiment. FIG. 2 is a perspective view showing a state in which the holder 50 is separated from the mounting portion 30. FIG. 3 is a perspective view showing a state in which the holder 50 is mounted on the mounting portion 30. In the present embodiment, the sewing machine 1 is an electronic cycle sewing machine. The sewing machine 1 includes a sewing machine body 10, an operating device 20 operated by an operator, and a control device 40 that controls the sewing machine 1.

[0012] The sewing machine body 10 is mounted on the table 2. The sewing machine body 10 includes a sewing machine frame 11, a needle bar 12 supported by the sewing machine frame 11, a main shaft motor 13 that generates power to move the needle bar 12, and a drive mechanism 14.

[0013] The sewing machine frame 11 has a horizontal arm 11A extending in the Y-axis direction, a bed portion 11B disposed below the horizontal arm 11A, a vertical arm 11C connecting the +Y side end of the horizontal arm 11A and the bed portion 11B, and a head portion 11D disposed on the -Y side of the horizontal arm 11A.

[0014] The needle bar 12 holds the sewing machine needle 3. The needle bar 12 holds the sewing machine needle 3 such that the sewing machine needle 3 and the Z-axis are parallel. The needle bar 12 is supported by the head portion 11D so as to be movable in the Z-axis direction. The head portion 11D drives the needle bar 12 holding the sewing machine needle 3 by the main shaft motor 13.

[0015] The main shaft motor 13 generates power to move the needle bar 12 in the Z-axis direction. The main shaft motor 13 includes a pulse motor. The main shaft motor 13 is disposed on the horizontal arm 11A.

[0016] Inside the horizontal arm 11A, a horizontal arm shaft extending in the Y-axis direction is disposed. The main shaft motor 13 is connected to the +Y side end of the horizontal arm shaft. The -Y side end of the horizontal arm shaft is connected to the needle bar 12 via a power transmission mechanism disposed inside the head portion 11D. When the main shaft motor 13 operates, the horizontal arm shaft rotates. The power generated by the main shaft motor 13 is transmitted to the needle bar 12 via the horizontal arm shaft and the power transmission mechanism. As a result, the sewing machine needle 3 held by the needle bar 12 reciprocates in the Z-axis direction.

[0017] Inside the vertical arm 11C, a timing belt extending in the Z-axis direction is arranged. Also, inside the bed portion 11B, a bed shaft extending in the Y-axis direction is arranged. Pulleys are arranged on each of the horizontal arm shaft and the bed shaft. The timing belt is looped around the pulley arranged on the horizontal arm shaft and the pulley arranged on the bed shaft respectively. The horizontal arm shaft and the bed shaft are connected via a power transmission mechanism including the timing belt.

[0018] The bed portion 11B holds the bobbin case below the head portion 11D. The bed portion 11B has a cylindrical cover 15 directly below the head portion 11D. Needle holes are formed in the cover 15, and the bobbin case is arranged inside the cover 15 directly below the needle holes. In FIGS. 2 and 3, for the sake of convenience, the state where the cover 15 is removed from the bed portion 11B is illustrated.

[0019] The bobbin case accommodates a bobbin placed in it. By the operation of the main shaft motor 13, each of the horizontal arm shaft and the bed shaft rotates. The power generated by the main shaft motor 13 is transmitted to the bobbin case via the horizontal arm shaft, the timing belt, and the bed shaft. Thereby, the bobbin case rotates in synchronization with the reciprocating movement of the needle bar 12 in the Z-axis direction.

[0020] As shown in FIG. 2, the sewing machine body 10 has a presser member 16 arranged around the sewing needle 3. The presser member 16 presses the sewing object around the sewing needle 3. The presser member 16 is supported by the head portion 11D so as to be movable in the Z-axis direction. Inside the head portion 11D, a presser motor 16A (see FIG. 5) that generates power to move the presser member 16 in the Z-axis direction is arranged. By the operation of the presser motor 16A, the presser member 16 moves in the Z-axis direction in synchronization with the needle bar 12. The presser member 16 suppresses the lifting of the sewing object due to the movement of the sewing needle 3.

[0021] As shown in FIG. 1, the drive mechanism 14 is arranged in the -Z direction of the horizontal arm 11A. The drive mechanism 14 has a mounting portion 30 provided on the outer periphery of the bed portion 11B (cylindrical cover 15). The drive mechanism 14 moves the mounting portion 30 in the axial direction (Y-axis direction) and the circumferential direction around the axis (θY direction) of the bed portion 11B. That is, the drive mechanism 14 can linearly move the mounting portion 30 along the axis AY passing through the bed portion 11B (cover 15), and can rotate the mounting portion 30 around the axis AY.

[0022] The mounting portion 30 is formed in an annular shape along the outer periphery of the cylindrical cover 15 of the bed portion 11B. As shown in FIG. 2, a holder 50 (see FIG. 2) for holding the sewing object can be mounted on the -Y direction end surface of the mounting portion 30. With the holder 50 mounted, when the mounting portion 30 is moved by the drive mechanism 14, the holder 50 can be moved in the Y-axis direction and the θY direction directly below the needle bar 12. By moving the holder 50 holding the sewing object based on the sewing data, a seam of a desired sewing pattern is formed on the sewing object.

[0023] The drive mechanism 14 holds the mounting portion 30 at the -Y direction end surface. The drive mechanism 14 includes a rotation mechanism that rotationally drives the mounting portion 30 around the axis AY, and a linear motion mechanism that linearly moves the rotation mechanism along the axis AY. The mounting portion 30 is rotatably supported via a bearing disposed in the annular housing 14A of the drive mechanism 14.

[0024] The rotation mechanism has a θ-axis motor 17 (see FIG. 5) that generates power to rotate the mounting portion 30 around the axis AY, and a power transmission mechanism that transmits the power of the θ-axis motor 17 to the mounting portion 30. The power transmission mechanism is composed of, for example, a belt-pulley mechanism.

[0025] The linear motion mechanism includes a linear guide that supports the rotary mechanism so as to be movable along the axis AY (in the Y-axis direction), a Y-axis motor 18 (see FIG. 5) that generates power to move the rotary mechanism along the axis AY (in the Y-axis direction), and a power transmission mechanism that transmits the power of the Y-axis motor 18 to the rotary mechanism. The power transmission mechanism is composed of, for example, a belt-pulley mechanism.

[0026] As shown in FIG. 1, the operating device 20 is operated by an operator. When the operating device 20 is operated, the sewing machine 1 operates. In the present embodiment, the operating device 20 includes an operation panel 21 and an operation pedal 22.

[0027] The operation panel 21 includes a display device including a flat panel display such as a liquid crystal display (LCD) or an organic EL display (OELD), and an input device that generates input data when operated by an operator. The input device of the operation panel 21 can receive operations related to sewing processing. In the present embodiment, the input device includes a touch sensor disposed on the display screen of the display device. That is, in the present embodiment, the operation panel 21 includes a touch panel having the function of the input device. The operation panel 21 is mounted on the upper surface of the table 2. The operation pedal 22 is disposed below the table 2. The operator operates the operation pedal 22 with the foot. When at least one of the operation panel 21 and the operation pedal 22 is operated by the operator, the sewing machine 1 operates.

[0028] [Functional Configuration of Sewing Machine] FIG. 4 is a block diagram showing an example of the functional configuration of the sewing machine 1 according to the present embodiment. As shown in FIG. 4, the sewing machine 1 includes a control device 40, an operation device 20, various actuators, and sensors. The control device 40 includes a control unit 41 and a storage unit 42 connected to the control unit 41. The control unit 41 is composed of a central arithmetic means such as a CPU (Central Processing Unit). The storage unit 42 stores the programs executed by the control unit 41 and functions as a work area for the arithmetic operations of the control unit 41. The control unit 41 can control the functional units of the sewing machine 1 according to data and commands, thereby realizing various functions. The functional units include, for example, the operation device 20 and each actuator, but are not limited thereto. Each actuator includes a main shaft motor 13, a θ-axis motor 17, a Y-axis motor 18, a middle presser motor 16A, an actuator 33B for clamping described later, etc., and other well-known configurations provided in the sewing machine 1 are omitted.

[0029] The storage unit 42 can store various information such as programs and sewing data. The program is a program that causes the control unit 41 to execute functions for realizing processes related to various operations of the sewing machine 1. The sewing data includes a sewing pattern for the sewing machine 1 to perform sewing.

[0030] The control unit 41 controls the sewing operation by the sewing machine 1 by executing the program. The control unit 41 controls each actuator based on the sewing data. The operations of each actuator are detected by sensors. The sensors include an encoder, a position sensor, a detection circuit, etc. The control unit 41 controls the operation timing, operation speed, etc. of each actuator based on the detection signals of the sensors.

[0031] [Mounting portion] FIG. 5 is a perspective view showing the mounting portion 30. The mounting portion 30 includes an annular base plate 31, an engaged portion 32, and a clamping mechanism 33.

[0032] The engaged part 32 positions the holder 50 with respect to the mounting part 30 by engaging with a part of the holder 50 (see FIGS. 2 and 3). The engaged part 32 is fixed to the -Y side surface of the base plate 31. The engaged part 32 is provided at two positions on the +X side and -X side in the circumferential direction of the base plate 31.

[0033] The engaged part 32 is formed in a V-shaped configuration having a pair of inclined surfaces 32A and 32B facing each other in the circumferential direction. Specifically, the engaged part 32 has a V-groove configuration with a bottom. That is, the engaged part 32 has a pair of V-shaped inclined surfaces 32A and 32B and a bottom surface 32C. The inclined surfaces 32A and 32B are inclined so that the distance between them becomes narrower as they go in the +Y direction, and are connected to each other at the +Y direction end. The bottom surface 32C is connected to the radially inner side ends of the pair of inclined surfaces 32A and 32B. The engaged part 32 positions the holder 50 by engaging with the engaging part 55 of the holder 50 described later so as to fit into the space (V-groove) partitioned by the pair of inclined surfaces 32A and 32B and the bottom surface 32C.

[0034] The clamp mechanism 33 is a mechanism for fixing the holder 50. The clamp mechanism 33 is fixed to the -Y side surface of the base plate 31. The clamp mechanism 33 is provided at two positions on the +X side and -X side in the circumferential direction of the base plate 31.

[0035] The clamp mechanism 33 has a fixing part 33A that releasably fixes the holder 50 engaged with the engaged part 32 and an actuator 33B that drives the fixing part 33A. The fixing part 33A is an engaging claw that protrudes toward the radially inner side of the mounting part 30 and is rotatably supported by a rotation shaft 33C. The actuator 33B is connected to the fixing part 33A and rotates the fixing part 33A around the rotation shaft 33C. The actuator 33B rotates the fixing part 33A between a fixed position and a release position. In the fixed position, the fixing part 33A engages with a part of the holder 50 from the -Y direction side (see FIG. 3) and restricts the holder 50 from moving in the -Y direction from the mounting part 30. In the release position, the fixing part 33A is out of contact with the holder 50, and the holder 50 can be freely attached to and detached from the mounting part 30.

[0036] In the example of FIG. 5, the mounting portion 30 has a first mark 34 indicating the circumferential mounting position of the holder 50 at the mounting location of the holder 50. The first mark 34 consists of a straight line extending radially outward from the inner peripheral edge of the base plate 31. The shape of the first mark 34 is arbitrary as long as the circumferential mounting position of the holder 50 can be identified. A pair of first marks 34 are provided at positions facing each other in the radial direction with the center of the mounting portion 30 interposed therebetween.

[0037] [Holder] As shown in FIG. 2, the holder 50 has an annular frame portion 51 and a support 52 for holding the object to be sewn. Regarding the structure of the holder 50, for convenience, the description will be made using the sewing coordinate system based on the state where the holder 50 is mounted on the mounting portion 30 (see FIG. 3).

[0038] The frame portion 51 is a connecting portion attached to the mounting portion 30. The frame portion 51 has an annular shape corresponding to the mounting portion 30. The central axis of the frame portion 51 coincides with the axis AY, which is the central axis of the mounting portion 30 and the cover 15 in the mounted state. The frame portion 51 is connected to the mounting portion 30 on one side (+Y direction) along the central axis. The support 52 is attached to the other side (-Y direction) of the frame portion 51 along the central axis.

[0039] The support 52 extends from the frame portion 51 in the -Y direction. The support 52 is detachably fixed to the frame portion 51 by a screw 62 (see FIG. 6) via an L-shaped bracket 61. The brackets 61 are provided at two locations on the +X side and the -X side.

[0040] FIG. 6 is a perspective view of the holder 50 viewed from above. FIG. 7 is a perspective view of the holder 50 viewed from below.

[0041] The support 52 has a support frame 53 and a holding plate 54. The holding plate 54 is detachably attached to the support frame 53. A slit 54A penetrating the holding plate 54 is formed in the holding plate 54. The slit 54A is formed in a shape corresponding to the sewing pattern. The holding plate 54 can be exchanged according to the object to be sewn and the sewing pattern. The support 52 (holding plate 54 and support frame 53) is arranged along the outer periphery of the cover 15 of the head portion 11D in the mounted state on the mounting portion 30.

[0042] As shown in FIG. 7, on the -Z side of the frame portion 51, a protrusion 51A for engaging with the fixing portion 33A of the clamp mechanism 33 is provided. The protrusion 51A protrudes in the -Y direction from the -Y side edge portion of the frame portion 51. The tip of this protrusion 51A engages with the fixing portion 33A (see FIG. 5), and the frame portion 51 is held by the mounting portion 30. Two protrusions 51A are provided at positions corresponding to the two fixing portions 33A. Since the protrusion 51A that engages with the fixing portion 33A of the clamp mechanism 33 is provided on the frame portion 51, the frame portion 51 can be mounted on the mounting portion 30 alone in a state where the support 52 is removed.

[0043] As shown in FIG. 6, the fixture 50 has an engaging portion 55 and an adjusting portion 56.

[0044] The engaging portion 55 is provided on the frame portion 51 via the adjusting portion 56. The engaging portion 55 engages between a pair of inclined surfaces 32A, 32B (see FIG. 5) of the engaged portion 32 of the mounting portion 30. The engaging portion 55 positions the fixture 50 with respect to the mounting portion 30 by engaging with the engaged portion 32. The adjusting portion 56 is provided on the frame portion 51 and holds the engaging portion 55 in a position-adjustable manner.

[0045] The engaging portion 55 and the adjusting portion 56 are provided at two positions on the +X side and -X side in the circumferential direction of the frame portion 51 corresponding to the two engaged portions 32 of the mounting portion 30.

[0046] FIG. 8 is a perspective view showing a state where the engagement between the engaging portion 55 and the engaged portion 32 is released, and FIG. 9 is a perspective view showing a state where the engaging portion 55 and the engaged portion 32 are engaged.

[0047] As shown in FIG. 8, the engaging portion 55 is a convex member (or block) that abuts against the inclined surfaces 32A, 32B and the bottom surface 32C by fitting into the engaged portion 32. The engaging portion 55 is attached to the adjusting portion 56 at the -Y direction end and protrudes in the +Y direction from the adjusting portion 56. The tip of the engaging portion 55 in the +Y direction is formed into a rounded curved surface. As shown in FIG. 9, when the engaging portion 55 enters the +Y direction toward the engaged portion 32, it abuts against the inclined surface 32A on one side in the circumferential direction of the frame portion 51 and abuts against the inclined surface 32B on the other side in the circumferential direction. Further, the engaging portion 55 abuts against the bottom surface 32C of the engaged portion 32 on the lower surface portion inside the radial direction of the frame portion 51. By abutting against each surface of the engaged portion 32 at three points, the engaging portion 55 positions the rotational position and the radial position of the holder 50. By engaging the two engaging portions 55 provided at two locations on the frame portion 51 with the corresponding engaged portions 32 respectively, the holder 50 is positioned with respect to the mounting portion 30. The engaging portion 55 maintains the abutting state with each surface of the engaged portion 32 in a state where the holder 50 is mounted on the mounting portion 30. Therefore, the engagement between the engaging portion 55 and the engaged portion 32 prevents the rotational displacement of the holder 50 with respect to the mounting portion 30 and the radial displacement of the holder 50 with respect to the mounting portion 30.

[0048] The adjusting portion 56 is a support base installed on the outer peripheral surface of the frame portion 51. The adjusting portion 56 is attached to the frame portion 51 so as to be positionally adjustable in at least one of the circumferential direction and the axial direction. In the embodiment, an example is shown in which the adjusting portion 56 is positionally adjustable in both the circumferential direction and the axial direction. Further, the adjusting portion 56 holds the engaging portion 55 so as to be positionally adjustable in the radial direction of the frame portion 51.

[0049] As shown in FIG. 8, the adjustment portion 56 is provided with a screw insertion hole 56A that penetrates the adjustment portion 56 in the thickness direction. The adjustment portion 56 is attached to the frame portion 51 by a screw 58A inserted through the screw insertion hole 56A. The screw insertion hole 56A is an oval hole extending in the axial direction of the frame portion 51. The screw 58A passes through the screw insertion hole 56A and is coupled to a screw hole formed in the frame portion 51. The inner diameter of the screw insertion hole 56A in the axial direction is larger than the outer diameter of the shaft portion of the screw 58A. The inner diameter of the screw insertion hole 56A in the circumferential direction is larger than the outer diameter of the shaft portion of the screw 58A. Therefore, the adjustment portion 56 can be positionally adjusted in the circumferential direction and the axial direction of the frame portion 51 within the formation range of the screw insertion hole 56A by loosening the screw 58A. By changing the circumferential position of the adjustment portion 56, the circumferential position of the engaging portion 55 can be adjusted. By changing the axial position of the adjustment portion 56, the axial position of the engaging portion 55 can be adjusted. The adjustment portion 56 is fixed to the frame portion 51 by tightening the screw 58A.

[0050] The adjustment portion 56 is provided with a screw insertion hole 56B that penetrates the adjustment portion 56 in the Y-axis direction. The adjustment portion 56 holds the engaging portion 55 by a screw 58B inserted through the screw insertion hole 56B. The screw insertion hole 56B is a long hole extending in the radial direction of the frame portion 51. The screw 58B passes through the screw insertion hole 56B and is coupled to a screw hole formed in the engaging portion 55. Therefore, the adjustment portion 56 can adjust the radial position of the engaging portion 55 within the formation range of the screw insertion hole 56B by loosening the screw 58B. The adjustment portion 56 can fix the radial position of the engaging portion 55 by tightening the screw 58B.

[0051] As shown in FIGS. 6 and 7, the holder 50 has a second mark 57 that matches the first mark 34. The second mark 57 consists of a straight line similar to the first mark 34. The second mark 57 extends in the Y direction on the outer peripheral surface of the frame portion 51 and is connected to the +Y side edge portion of the frame portion 51. The shape of the second mark 57 is arbitrary as long as it can identify the circumferential mounting position of the holder 50. A pair of second marks 57 are provided at positions radially opposed across the center of the frame portion 51 corresponding to the first mark 34.

[0052] The above has described an example of the configuration of the sewing machine 1 according to the present embodiment. The configuration of the sewing machine 1 according to the present embodiment is not limited to such an example. The configuration of the sewing machine 1 according to the present embodiment can be flexibly modified according to specifications and operations.

[0053] [Position adjustment procedure of the engaging part] Next, an example of the position adjustment procedure of the engaging part 55 will be described. The position adjustment of the engaging part 55 is carried out as a preparatory work for the first sewing using the holder 50. FIG. 10 is a diagram for explaining the position adjustment work of the engaging part 55.

[0054] As shown in FIG. 10, in the position adjustment, since the support 52 of the holder 50 is not necessary, the support 52 can be removed from the frame part 51. Specifically, by removing the screw 62 that fixes the bracket 61 shown in FIG. 6, the bracket 61 and the support 52 are separated from the frame part 51.

[0055] Next, the frame part 51 is temporarily fixed using a jig 71 for temporarily fixing the frame part 51 to the mounting part 30. The jig 71 is, for example, an L-shaped angle, and the relative position between the mounting part 30 and the frame part 51 is fixed by a screw 72. The mounting part 30 (base plate 31) is provided with a jig mounting part 35 (see FIG. 5), which is a screw hole for coupling the screw 72. The frame part 51 functions as a jig mounting part 59 for fixing the above-mentioned screw hole of the bracket 61. The jig mounting part 59 may be provided separately from the screw hole for the bracket 61. The frame part 51 is temporarily fixed to the mounting part 30 by a screw 72 using a jig 71 straddling the jig mounting part 35 and the jig mounting part 59. The jig mounting part 35 is provided so that the frame part 51 can be fixed at a normal position where the circumferential positions of the first mark 34 and the second mark 57 coincide.

[0056] In the temporarily fixed state, the position of the engaging portion 55 is adjusted. As shown in FIG. 9, by loosening the screws 58A and 58B of the adjusting portion 56, the circumferential position, axial position, and radial position of the engaging portion 55 are adjusted. That is, the circumferential position and axial position of the engaging portion 55 (adjusting portion 56) are adjusted so that the tip of the engaging portion 55 comes into contact with both the inclined surfaces 32A and 32B of the engaged portion 32 at the same time. Also, the radial position of the engaging portion 55 is adjusted so that the lower surface of the engaging portion 55 comes into contact with the bottom surface 32C of the engaged portion 32. After the position adjustment, by tightening the screws 58A and 58B, the adjusting portion 56 is fixed to the frame portion 51, and the engaging portion 55 is fixed to the adjusting portion 56. The position adjustment of the engaging portion 55 is performed for each of the two engaging portions 55. As a result, the engaging portion 55 engages with the engaged portion 32 without a gap in the circumferential, axial, and radial directions. As a result, the engaging portion 55 and the engaged portion 32 can engage without rattling.

[0057] After the position adjustment, by removing the screw 72, the jig 71 for temporary fixing is removed, and the temporary fixing of the frame portion 51 to the mounting portion 30 is released. Then, the preparation work is completed by attaching the support 52 to the frame portion 51 via the bracket 61.

[0058] After that, when the preparation work is completed, the operator can attach the holder 50 to the mounting portion 30 just by aiming the holder 50 at the mounting portion 30 with the first mark 34 and the second mark 57 as a guide. That is, the operator presses the holder 50 in the +Y direction toward the mounting portion 30 with the circumferential position of the second mark 57 of the holder 50 aligned with the position of the first mark 34 of the mounting portion 30. By the prior preparation work, the engaging portion 55 engages with the engaged portion 32 without a gap. Since the engaged portion 32 is formed in a V-groove shape, even if the circumferential position of the holder 50 is slightly deviated, the engaging portion 55 is guided to the normal position by the inclined surfaces 32A and 32B.

[0059] After the engaging portion 55 engages with the engaged portion 32, the fixed portion 33A rotates from the release position to the fixed position by the operation of the actuator 33B. As a result, the holder 50 is fixed to the mounting portion 30. Then, when an input operation to the operating device 20 is received with the sewing object held by the holder 50 (support 52), sewing is started.

[0060] [Effect] As described above, in the present embodiment, the sewing machine 1 includes a mounting portion 30 having a V-shaped engaged portion 32 having a pair of inclined surfaces 32A and 32B, and a holder 50 having an adjusting portion 56 that holds the engaging portion 55 in a position-adjustable manner. Thereby, after the position of the engaging portion 55 is adjusted so as to contact both of the pair of inclined surfaces 32A and 32B, the engaging portion 55 is engaged with the engaged portion 32, and the holder 50 can be mounted on the mounting portion 30. Since the V-shaped engaged portion 32 can guide the engaging portion 55 to a position where it contacts both of the pair of inclined surfaces 32A and 32B, the position adjustment of the engaging portion 55 can be facilitated. Since the engaging portion 55 contacts both of the V-shaped inclined surfaces 32A and 32B, no minute gap due to dimensional error is generated, and rattling between the mounting portion 30 and the holder 50 can be suppressed. And even when there is a dimensional error, the position of the engaging portion 55 can be adjusted so as to engage with the engaged portion 32 without a gap, so that the position reproducibility of the holder 50 with respect to the mounting portion 30 can be improved.

[0061] Further, in the present embodiment, the engaged portion 32 has a V-groove shape with a bottom, and the engaging portion 55 is a convex member that contacts the pair of inclined surfaces 32A and 32B and the bottom surface 32C by fitting into the engaged portion 32. Thereby, by the engagement between the engaging portion 55 and the engaged portion 32, not only the circumferential positioning of the holder 50 but also the radial positioning can be performed. As a result, not only the circumferential rattling but also the radial rattling between the holder 50 and the mounting portion 30 can be suppressed.

[0062] The adjusting part 56 is attached to the frame part 51 so as to be position - adjustable in the circumferential direction and the axial direction, and holds the engaging part 55 so as to be position - adjustable in the radial direction of the frame part 51. Thereby, with a simple structure, the circumferential position, the axial position, and the radial position of the engaging part 55 can be adjusted. Further, the frame part 51 can be attached to the mounting part 30 with the support body 52 removed. Thereby, the position - adjusting operation of the engaging part 55 can be performed with only the frame part 51 with the support body 52 removed. As a result, the workability of the position - adjusting operation is improved. Note that the adjusting part 56 may be attached to the frame part 51 so as to be position - adjustable in only one of the circumferential direction and the axial direction. Thereby, the position adjustment of the engaging part 55 in the said direction can be easily performed.

[0063] The mounting part 30 has a fixing part 33A that removably fixes the holder 50 engaged with the engaged part 32, and an actuator 33B that drives the fixing part 33A. Here, if an attempt is made to realize positioning, fixing, and fixing release with the same mechanism, the structure of the mechanism for performing the positioning and fixing becomes complicated. On the other hand, in the above configuration, the fixing and fixing release of the holder 50 with respect to the mounting part 30 can be performed separately from the positioning of the holder 50 by the engaging part 55 and the engaged part 32. Therefore, the positioning structure and the fixing structure (clamping mechanism 33) can be simplified respectively.

[0064] The mounting part 30 has a first mark 34 at the mounting position of the holder 50, and the holder 50 has a second mark 57 that matches the first mark 34. Thereby, the holder 50 can be attached to the mounting part 30 using the first mark 34 and the second mark 57 as marks. Therefore, the workability of attaching and detaching the holder 50 is improved. Further, the mounting part 30 and the frame part 51 have jig mounting parts (jig mounting part 35 and jig mounting part 59) for temporarily fixing each other. Thereby, during the position - adjusting operation of the engaging part 55, the mounting part 30 and the frame part 51 can be temporarily fixed, so that the workability of the position - adjusting operation is improved.

Explanation of reference numerals

[0065] 1... Sewing machine, 2... Table, 10... Sewing machine body, 11... Sewing machine frame, 11A... Horizontal arm, 11B... Bed part, 11C... Vertical arm, 11D... Head part, 12... Needle bar, 13... Spindle motor, 14... Driving mechanism, 14A... Housing, 15... Cover, 16... Middle presser member, 16A... Middle presser motor, 17... θ-axis motor, 18... Y-axis motor, 20... Operating device, 21... Operating panel, 22... Operating pedal, 30... Mounting part, 31... Base plate, 32A, 32B... Inclined surfaces, 32C... Bottom surface, 32... Engaged part, 33... Clamping mechanism, 33A... Fixed part, 33B... Actuator, 33C... Rotating shaft, 34... First mark, 35... Fixture mounting part, 40... Control device, 41... Control part, 42... Memory part, 50... Holder, 51... Frame part, 51A... Protrusion, 52... Support, 53... Support frame, 54... Holding plate, 54A... Slit, 55... Engaging part, 56A, 56B... Screw insertion holes, 56... Adjusting part, 57... Second mark, 59... Fixture mounting part, 61... Bracket, 71... Fixture, AY... Axis.

Claims

1. A head portion that drives a needle bar for holding a sewing needle, A bed portion that holds a bobbin below the head portion, A driving mechanism having an annular mounting portion provided on the outer periphery of the bed portion, the driving mechanism moving the mounting portion in the axial direction and the circumferential direction around the axis of the bed portion, A holder detachably attached to the mounting portion and holding a sewing object, and comprising: The mounting portion has a V-shaped engaged portion having a pair of inclined surfaces facing each other in the circumferential direction, The holder has an engaging portion that engages between the pair of inclined surfaces and an adjusting portion that holds the engaging portion so that the position can be adjusted, A sewing machine.

2. The engaged portion has a bottomed V-groove shape having a pair of V-shaped inclined surfaces and a bottom surface connecting to the radially central side ends of the pair of inclined surfaces, The engaging portion is a convex member that abuts against the pair of inclined surfaces and the bottom surface by fitting into the engaged portion, The sewing machine according to Claim 1.

3. The holder has an annular frame portion, The adjusting portion is attached to the frame portion so that the position can be adjusted in at least one of the circumferential direction and the axial direction, and holds the engaging portion so that the position can be adjusted in the radial direction of the frame portion, The sewing machine according to Claim 2.

4. The holder is detachably provided with respect to the frame portion and has a support body for holding the sewing object, The frame portion can be mounted on the mounting portion in a state where the support body is removed, The sewing machine according to Claim 3.

5. The mounting portion has a fixing portion that releasably fixes the holder engaged with the engaged portion and an actuator that drives the fixing portion, The sewing machine according to any one of Claims 1 to 4.

6. The mounting portion has a first mark indicating the circumferential mounting position of the holder at the mounting location of the holder, The holder has a second mark that matches the first mark, The sewing machine according to any one of Claims 1 to 4.

7. The mounting portion and the frame portion have a jig mounting portion for temporarily fixing each other, The sewing machine according to Claim 4.

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