JP7193205B2 - Connection mechanism, sewing machine, and bobbin thread automatic feeder - Google Patents

Description

The present invention relates to a connecting mechanism, a sewing machine, and an automatic bobbin thread feeder.

A sewing machine has a hook in which a bobbin case is housed. The bobbin case accommodates a bobbin wound with a bobbin thread. In industrial sewing machines, sewing is performed at high speed. Therefore, bobbin replacement work is frequently carried out. Patent Literature 1 discloses an automatic bobbin thread feeding device capable of automatically performing bobbin replacement work.

JP-A-11-114269

The automatic bobbin thread feeder is detachably attached to the sewing machine. When attaching or detaching the automatic bobbin thread feeder to facilitate maintenance work of the hook of the sewing machine, the automatic bobbin thread feeder is attached to the sewing machine with improper positioning between the sewing machine and the automatic bobbin thread feeder. If so, the position of the center hole of the bobbin case and the position of the hook shaft of the hook of the sewing machine may not match, and the bobbin case and at least part of the hook may come into contact with each other. As a result, at least one of the bobbin case and hook may be worn or damaged.

An object of the present invention is to attach an automatic bobbin thread feeder to a sewing machine in a properly positioned state.

According to a first aspect of the present invention, a first member fixed to one of a sewing machine and an automatic bobbin thread feeder; A connection mechanism comprising: a reference pin inserted into a first hole of a second member to which the .

According to a second aspect of the invention there is provided a sewing machine comprising the connecting mechanism of the first aspect.

According to a third aspect of the present invention, there is provided an automatic bobbin thread feeder comprising the connecting mechanism of the first aspect.

According to the aspect of the present invention, the automatic bobbin thread feeder can be attached to the sewing machine in a properly positioned state.

FIG. 1 is a diagram schematically showing part of a sewing machine and an automatic bobbin thread feeder according to this embodiment. FIG. 2 is a perspective view showing a portion of the sewing machine and the automatic bobbin thread feeder according to this embodiment. FIG. 3 is a perspective view showing an example of the connection mechanism according to this embodiment. FIG. 4 is a perspective view showing an example of the first member according to this embodiment. FIG. 5 is a perspective view showing an example of the first member according to this embodiment. FIG. 6 is a perspective view showing an example of the frame according to this embodiment. FIG. 7 is a perspective view showing an example of the second member according to this embodiment. FIG. 8 is a perspective view showing an example of a reference pin and an eccentric pin according to this embodiment. FIG. 9 is a schematic diagram for explaining the action of the eccentric pin according to this embodiment.

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. The constituent elements of the embodiments described below can be combined as appropriate. Also, some components may not be used.

In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship of each part will be described with reference to this XYZ orthogonal coordinate system. The direction parallel to the X-axis in the horizontal plane is the X-axis direction, the direction parallel to the Y-axis in the horizontal plane orthogonal to the X-axis is the Y-axis direction, and the direction parallel to the Z-axis orthogonal to the horizontal plane is the Z-axis direction. do. The θX direction is the direction of rotation or tilt about the X axis, the θY direction is the direction of rotation or tilt about the Y axis, and the θZ direction is the direction of rotation or tilt about the Z axis. . Further, in the following description, a plane including the X-axis and the Y-axis is appropriately referred to as an XY plane, a plane including the X-axis and the Z-axis is appropriately referred to as an XZ-plane, and a plane including the Y-axis and the Z-axis is referred to as an XZ plane. is appropriately referred to as the YZ plane. The XY plane is parallel to the horizontal plane. The XY plane, the XZ plane, and the YZ plane are orthogonal.

[Overview of sewing machine and bobbin thread automatic feeder]
FIG. 1 is a diagram schematically showing part of a sewing machine 10 and an automatic bobbin thread feeder 20 according to this embodiment. FIG. 2 is a perspective view showing a portion of the sewing machine 10 and the automatic bobbin thread feeder 20 according to this embodiment. The automatic bobbin thread feeder 20 is detachably attached to the sewing machine 10 . The sewing machine 10 and the automatic bobbin thread feeder 20 are connected via a connection mechanism 30 .

As shown in FIGS. 1 and 2, a sewing machine 10 includes a sewing machine head 11 for sewing a material, a table 12 on which the material is placed, a frame 13 supporting the table 12, and a hook 14 supported by the frame 13. Prepare. 2 shows a portion of the sewing machine 10 with the sewing machine head 11 and table 12 removed.

The sewing machine head 11 has a driving mechanism for moving the sewing needle in the vertical direction, and a pressing member for pressing the cloth placed on the table 12 from above. A sewing needle is supplied with a top thread and a bobbin thread. The fabric placed on the table 12 is sewn by moving the sewing needle vertically while the fabric is pressed by the presser member.

A table 12 supports the dough. The sewing head 11 is mounted on the upper surface of the table 12 .

Frame 13 supports table 12 . The frame 13 is arranged below the table 12 . At least part of the frame 13 is fixed to the bottom surface of the table 12 .

The pot 14 is arranged below the table 12 . A shuttle shaft 14S provided at the center of the shuttle 14 is parallel to the X-axis. The bobbin case 1 is housed in the hook 14 . A bobbin case 1 accommodates a bobbin wound with a lower thread. A bobbin thread is supplied from a bobbin case 1 housed in a hook 14 to a sewing needle.

The automatic bobbin thread feeding device 20 has a bobbin conveying device 21 , a bobbin changing device 22 , a bobbin thread winding device 23 , and a residual thread removing device 24 .

The bobbin conveying device 21 includes an arm 25, a first driving device 26 that turns the arm 25 around a rotation axis AX parallel to the X axis, and a second driving device 27 that moves the bobbin changing device 22 in the X-axis direction. have

The first drive device 26 has a drive shaft 28 extending in the X-axis direction and a first stepping motor that generates power to rotate the drive shaft 28 about the rotation axis AX. The proximal end of arm 25 is connected to drive shaft 28 . As the drive shaft 28 rotates about the rotation axis AX, the distal end of the arm 25 turns about the rotation axis AX.

The second driving device 27 has a second stepping motor that generates power to move the bobbin changing device 22 in the X-axis direction. The arm 25 is connected to the drive shaft 28 so as to be relatively non-rotatable in the θZ direction and relatively movable in the X-axis direction. The second driving device 27 slides the bobbin changing device 22 in the X-axis direction with respect to the driving shaft 28 by the power generated by the second stepping motor.

The bobbin changing device 22 releasably holds the bobbin case 1 . The bobbin changing device 22 includes a holding mechanism that releasably holds the bobbin case 1 and an actuator that drives the holding mechanism. The actuator drives the holding mechanism so as to change from one of a holding state in which the bobbin case 1 is held and a release state in which the bobbin case 1 is released to the other.

A bobbin winding device 23 winds a bobbin with a bobbin. The bobbin winding device 23 winds the bobbin with the bobbin by rotating the bobbin after winding the bobbin with the bobbin.

A residual yarn removing device 24 removes the lower yarn wound around the bobbin from the bobbin. The bobbin case 1 unloaded from the hook 14 is conveyed to the residual yarn removing device 24 by the bobbin conveying device 21 . The residual yarn removing device 24 removes the bobbin thread from the bobbin conveyed by the bobbin conveying device 21 .

As shown in FIG. 1 , the bobbin conveying device 21 rotates the arm 25 about the rotation axis AX to move the bobbin changing position A facing the hook 14 to the bobbin thread winding device 23 . The bobbin changing device 22 is moved between the turning position B and the residual yarn removing position C defined in the residual yarn removing device 24 .

When unloading the bobbin from the hook 14, the bobbin conveying device 21 operates the first driving device 26 to pivot the arm 25 so that the bobbin changing device 22 is positioned at the bobbin changing position A. After the bobbin changing device 22 is arranged in the bobbin changing device A, the bobbin conveying device 21 operates the second driving device 27 to move the bobbin changing device 22 in the +X direction. As a result, the bobbin changing device 22 approaches the hook 14 . The bobbin case 1 is accommodated in the hook 14. - 特許庁The bobbin changing device 22 holds the bobbin case 1 housed in the hook 14 . After the bobbin case 1 is held by the bobbin changing device 22, the bobbin conveying device 21 operates the second driving device 27 to move the bobbin changing device 22 in the -X direction. As a result, the bobbin case 1 is unloaded from the hook 14 by the bobbin exchanging device 22 .

The bobbin conveying device 21 operates the first driving device 26 to turn the arm 25 so that the bobbin changing device 22 holding the bobbin case 1 is arranged in the residual yarn removing device C. As shown in FIG. The residual yarn removing device 24 removes the residual yarn from the bobbin of the bobbin case 1 arranged at the residual yarn removal position C.

When the bobbin is carried into the hook 14, the bobbin conveying device 21 operates the first driving device 26 to turn the arm 25 so that the bobbin changing device 22 is arranged at the lower thread winding position B. As shown in FIG. At the lower thread winding position B, the lower thread winding device 23 passes the bobbin case 1 containing the bobbin wound with the lower thread to the bobbin changing device 22 .

After the bobbin case 1 is held by the bobbin changing device 22, the bobbin conveying device 21 operates the first driving device 26 to pivot the arm 25 so that the bobbin changing device 22 is positioned at the bobbin changing position A. . After the bobbin changing device 22 is arranged in the bobbin changing device A, the bobbin conveying device 21 operates the second driving device 27 to move the bobbin changing device 22 in the +X direction. As a result, the bobbin case 1 is carried into the hook 14 by the bobbin exchanging device 22 . After the bobbin case 1 is carried into the hook 14 and the bobbin changing device 22 releases the bobbin case 1, the bobbin conveying device 21 operates the second driving device 27 to move the bobbin changing device 22 in the -X direction. . As a result, the bobbin changing device 22 is withdrawn from the hook 14 .

In this way, the automatic bobbin thread feeding device 20 performs the bobbin replacement work in which the bobbin case 1 containing the used bobbin is removed from the hook 14 and the bobbin case 1 containing a new bobbin is attached to the hook 14 . It is possible to perform a residual yarn removing operation of removing the residual yarn from the bobbin taken out from the bobbin and a bobbin winding operation of winding the bobbin yarn around a new bobbin.

The automatic bobbin thread feeder 20 has a frame 29 . The frame 29 supports the bobbin thread winding device 23 and the residual thread removing device 24 . A drive shaft 28 of the bobbin conveying device 21 is rotatably supported by a frame 29 .

[Connection mechanism]
Next, the connection mechanism 30 according to this embodiment will be described. FIG. 3 is a perspective view showing an example of the connection mechanism 30 according to this embodiment. FIG. 3 shows a state in which some components of the automatic bobbin thread feeder 20 are removed in order to make the connection mechanism 30 easier to see.

As shown in FIGS. 1, 2, and 3, the connection mechanism 30 includes a first member 31 fixed to at least a portion of the sewing machine 10 and a first member 31 fixed to at least a portion of the automatic bobbin thread feeder 20. It has two members 32 , a reference pin 41 supported by the first member 31 , and an eccentric pin 42 rotatably supported by the first member 31 . The reference pin 41 is inserted into the first hole 51 provided in the second member 32 . The eccentric pin 42 is inserted into a second hole 52 provided in the second member 32 .

In this embodiment, the second member 32 is arranged in the −X direction of the first member 31 . The automatic bobbin thread feeder 20 is connected to the frame 13 of the sewing machine 10 from the -X side.

The first member 31 and the second member 32 are detachably fixed by bolts 61 and 62 which are fixing members. The bolts 61 are arranged above and below the reference pin 41 . The bolts 62 are arranged above and below the eccentric pin 42 .

FIG. 4 is a perspective view showing an example of the first member 31 according to this embodiment. FIG. 4 shows the first member 31 in a state in which the fixing between the first member 31 and the second member 32 by the bolts 61 and 62 is released and the second member 32 is removed.

The first member 31 is secured to the frame 13 of the sewing machine 10, as shown in FIGS. The first member 31 is detachably fixed to the frame 13 by bolts 63 and 64 .

The first member 31 is a frame-shaped member. The first member 31 has a bracket portion 31A and a bracket portion 31B fixed to the frame 13 and a connecting portion 31C connected to the second member 32 .

Each of the bracket portion 31A and the bracket portion 31B can contact the surface of the frame 13 parallel to the YZ plane. The surface of the frame 13 to which the bracket portion 31A and the bracket portion 31B are connected faces the -X direction. The bracket portion 31A and the bracket portion 31B are arranged on both sides of the hook 14 in the Y-axis direction. The bracket portion 31A is connected to the surface of the frame 13 on the +Y side of the hook 14 . The bracket portion 31B is connected to the surface of the frame 13 on the -Y side of the hook 14. As shown in FIG.

The bracket portion 31A is fixed to the frame 13 by bolts 63. As shown in FIG. The bracket portion 31B is fixed to the frame 13 with bolts 64. As shown in FIG.

The connecting portion 31C is arranged between the bracket portion 31A and the bracket portion 31B in the Y-axis direction. With the bracket portion 31A and the bracket portion 31B fixed to the frame 13, the connecting portion 31C is arranged below the hook 14. As shown in FIG. Also, with the bracket portion 31A and the bracket portion 31B fixed to the frame 13, the connecting portion 31C is arranged in the -X direction from the hook 14. As shown in FIG.

The connecting portion 31C has a first projecting portion 33S and a second projecting portion 33T projecting in the -X direction. Also, the connecting portion 31C has a first contact surface 33A and a second contact surface 33B that contact the second member 32 . The first contact surface 33A is the surface of the first protrusion 33S. The second contact surface 33B is the surface of the third protrusion 33T.

Each of the first contact surface 33A and the second contact surface 33B is a plane parallel to the YZ plane. Each of the first contact surface 33A and the second contact surface 33B faces the -X direction. The first contact surface 33A and the second contact surface 33B are arranged in the same plane (flush). In the first member 31, the first contact surface 33A and the second contact surface 33B are planes arranged on the most -X side.

The first contact surface 33A and the second contact surface 33B are arranged in the Y-axis direction. The first contact surface 33A and the second contact surface 33B are separated. The first contact surface 33A and the second contact surface 33B are arranged below the hook 14 . The first contact surface 33A and the second contact surface 33B are arranged on both sides of the hook 14 in the Y-axis direction.

Each of the reference pin 41 and the eccentric pin 42 is supported by the first member 31 . In this embodiment, the reference pin 41 is provided on the first contact surface 33A so as to protrude from the first contact surface 33A in the -X direction. The eccentric pin 42 is provided on the second contact surface 33B so as to protrude from the second contact surface 33B in the -X direction.

A portion of the reference pin 41 is inserted into the first support hole 34A provided in the first contact surface 33A. A part of the eccentric pin 42 is inserted into the second support hole 34B provided in the second contact surface 33B. The reference pin 41 is supported by the first support hole 34A. The eccentric pin 42 is rotatably supported in the second support hole 34B. The second support hole 34B is provided with a screw hole 38 (see FIG. 5) on the side surface (the lower side surface in this embodiment), and the eccentric pin 42 is fixed from the side surface by a set screw 37 (see FIG. 5). there is By loosening the set screw 37, the rotation of the eccentric pin 42 can be adjusted.

As shown in FIG. 4, threaded holes 35A to be coupled with bolts 61 are provided above and below the reference pin 41 on the first contact surface 33A. Threaded holes 35B to be coupled with bolts 62 are provided above and below the eccentric pin 42 on the second contact surface 33B.

FIG. 5 is a perspective view showing an example of the first member 31 according to this embodiment. FIG. 6 is a perspective view showing an example of the frame 13 according to this embodiment. FIG. 5 shows the first member 31 removed from the frame 13 by releasing the bolts 63 and 64 between the first member 31 and the frame 13 . FIG. 6 shows the frame 13 in a state in which the first member 31 and the frame 13 are unfixed by the bolts 63 and 64 and the first member 31 is removed.

As shown in FIG. 6, the frame 13 has a contact surface 15A and a contact surface 15B that contact the first member 31. As shown in FIG. The frame 13 has protrusions 15S and 15T that protrude in the -X direction. The contact surface 15A is the surface of the protrusion 15S. The contact surface 15B is the surface of the protrusion 15T.

Each of the contact surface 15A and the contact surface 15B is a plane parallel to the YZ plane. Each of the contact surface 15A and the contact surface 15B faces the -X direction. The contact surface 15A and the contact surface 15B are arranged in the same plane (flush).

The contact surface 15A and the contact surface 15B are arranged in the Y-axis direction. The contact surface 15A and the contact surface 15B are separated. The contact surface 15A and the contact surface 15B are arranged on both sides of the hook 14 in the Y-axis direction.

As shown in FIG. 6, a screw hole 16A coupled with a bolt 63 is provided in the contact surface 15A. Also, a threaded hole 16B coupled with a bolt 64 is provided in the contact surface 15B.

The frame 13 has positioning pins 43 . The positioning pin 43 is provided on the contact surface 15A so as to protrude from the contact surface 15A in the -X direction. The positioning pin 43 is provided between two screw holes 16A provided in the Z-axis direction.

As shown in FIG. 5, the first member 31 has a third hole 53 into which the positioning pin 43 is inserted. The third hole 53 is provided in the bracket portion 31A of the first member 31 . The positioning pin 43 is inserted into a third hole 53 provided in the bracket portion 31A of the first member 31. As shown in FIG.

When connecting the frame 13 and the first member 31 , the positioning pin 43 is inserted into the third hole 53 . Thereby, the frame 13 and the first member 31 are positioned. After the frame 13 and the first member 31 are positioned, the frame 13 and the first member 31 are fixed with the bolts 63 and 64 .

As shown in FIGS. 2, 3, 4, and 5, the reference pin 41 and the eccentric pin 42 are arranged in the Y-axis direction. That is, the reference pin 41 and the eccentric pin 42 are arranged substantially horizontally.

FIG. 7 is a perspective view showing an example of the second member 32 according to this embodiment. As shown in FIG. 7 , the second member 32 is fixed to the frame 29 of the automatic bobbin thread feeder 20 .

The second member 32 has a first hole 51 into which the reference pin 41 is inserted and a second hole 52 into which the eccentric pin 42 is inserted. The first hole 51 and the second hole 52 are arranged in the Y-axis direction. The first hole 51 is a circular hole. The second hole 52 is an elongated hole elongated in the Y-axis direction (horizontal direction).

The second member 32 also has an opening 36A in which the bolt 61 is arranged and an opening 36B in which the bolt 62 is arranged. The openings 36A are provided above and below the first hole 51, respectively. The openings 36B are provided above and below the second holes 52, respectively. The openings 36A and 36B are openings slightly larger than the diameter of the bolts 61,62.

FIG. 8 is a perspective view showing an example of the reference pin 41 and the eccentric pin 42 according to this embodiment.

The reference pin 41 has a surface arranged around the central axis C1. When the reference pin 41 is supported in the first support hole 34A of the first member 31, the central axis C1 of the reference pin 41 and the X axis are parallel. The outer shape of the reference pin 41 is circular in the YZ plane perpendicular to the central axis C1. That is, the reference pin 41 is a round pin. Further, the outer shape and dimensions of the reference pin 41 are constant in the direction parallel to the central axis C1. That is, the reference pin 41 is a straight pin.

While the first portion 411 including the +X side end of the reference pin 41 is supported by the first support hole 34A, the second portion 412 including the -X side end of the reference pin 41 is attached to the second member 32. is arranged in the first hole 51 of the .

The eccentric pin 42 has a first shaft portion 421 having a surface arranged around the first central axis C2a and a second shaft portion 422 having a surface arranged around the second central axis C2b. The first shaft portion 421 is arranged on the +X side of the second shaft portion 422 and fixed to the +X side end of the second shaft portion 422 . The first shaft portion 421 and the second shaft portion 422 are a single member.

The first central axis C2a and the second central axis C2b are parallel. In the YZ plane orthogonal to the first central axis C2a, the position of the first central axis C2a and the position of the second central axis C2b are different. That is, the first shaft portion 421 and the second shaft portion 422 are eccentric.

The outer shape of the first shaft portion 421 is circular in the YZ plane orthogonal to the first central axis C2a. The outer shape of the second shaft portion 422 is circular in the YZ plane orthogonal to the second central axis C2b. The outer shape and dimensions of the first shaft portion 421 are constant in the direction parallel to the first central axis C2a. The outer shape and dimensions of the second shaft portion 422 are constant in the direction parallel to the second central axis C2b.

The distance between the second central axis C2b and the surface of the second shaft portion 422 is greater than the distance between the first central axis C2a and the surface of the first shaft portion 421 . In other words, the second shaft portion 422 is thicker than the first shaft portion 421 .

In this embodiment, the first shaft portion 421 of the eccentric pin 42 is supported by the first member 31 . That is, the first shaft portion 421 of the eccentric pin 42 is inserted into the second support hole 34B. The second shaft portion 422 of the eccentric pin 42 is arranged in the second hole 52 of the second member 32 while the first shaft portion 421 of the eccentric pin 42 is supported by the second support hole 34B. With the first shaft portion 421 supported in the second support hole 34B of the first member 31, the first center axis C2a of the first shaft portion 421, the second center axis C2b of the second shaft portion 422, and the X axis are parallel.

The reference pin 41 is supported in the first support hole 34A, and the first shaft portion 422 of the eccentric pin 42 is supported in the second support hole 34B. 41 and the first shaft portion 422 of the eccentric pin 42 are fixed.

A groove 44 is provided on the top surface of the second shaft portion 422 of the eccentric pin 42 . Groove 44 can accommodate at least a portion of a tool such as a screwdriver. With the first shaft portion 421 supported in the first support hole 34B, the operator loosens the setscrew 37 that fixes the eccentric pin 42 in advance, thereby loosening the eccentric pin 42 using a tool. can be manipulated. The operator can rotate the eccentric pin 42 around the first central axis C2a while the first shaft portion 421 is supported by the first support hole 34B.

Also, the operator can ensure that the first portion 411 of the reference pin 41 is supported by the first support hole 34A of the first member 31 and the first shaft portion 421 of the eccentric pin 42 is supported by the second support hole 34B of the first member 31. In a state where the reference pin 41 is arranged in the first hole 51 of the second member 32 and the second shaft portion 422 of the eccentric pin 42 is arranged in the second hole 52, it is eccentric about the first central axis C2a. Pin 42 can be rotated.

[Connection method]
Next, a method of connecting the sewing machine 10 and the automatic bobbin thread feeder 20 according to this embodiment will be described.

A reference pin 41 supported by the first member 31 is inserted into a first hole 51 provided in the second member 32 . Also, the eccentric pin 42 supported by the first member 31 is inserted into the second hole 52 provided in the second member 32 . Thereby, the first member 31 and the second member 32 are roughly positioned.

With the reference pin 41 arranged in the first hole 51 and the second shaft portion 422 of the eccentric pin 42 arranged in the second hole 52, the operator uses a tool to rotate the first center axis C2a. Eccentric pin 42 is rotated. The set screw 37 fixing the eccentric pin 42 is loosened in advance. As a result, the second member 32 is slightly inclined in the θX direction around the reference pin 41, and the −Y side end of the second member 32 where the second hole 52 is provided moves slightly in the vertical direction. do.

FIG. 9 is a schematic diagram for explaining the action of the eccentric pin 42 according to this embodiment. FIG. 9 schematically shows the position of the second member 32 when the eccentric pin 42 is rotated about the first central axis C2a.

The reference pin 41 is supported by the first support hole 34A so that the relative position with respect to the first member 31 does not change within the YZ plane. The first shaft portion 421 of the eccentric pin 42 is supported in the second support hole 34B so that the relative position with respect to the first member 31 does not change within the YZ plane. Therefore, even if the eccentric pin 42 is rotated, the relative position between the rotation axis C1 of the reference pin 41 and the first central axis C2a of the eccentric pin 42 does not change in the YZ plane. In other words, the relative position between the rotation axis C1 of the reference pin 41 and the first central axis C2a of the eccentric pin 42 is fixed within the YZ plane.

On the other hand, when the eccentric pin 42 is rotated, the position of the second shaft portion 422 within the YZ plane changes.

As shown in FIG. 9B, when the eccentric pin 42 is rotated so that the first central axis C2a and the second central axis C2b are positioned at the same height, the first hole 51 and the second hole 52 are arranged at substantially the same height.

As shown in FIG. 9A, when the eccentric pin 42 is rotated so that the second central axis C2b is positioned on the +Z side of the first central axis C2a, the inner surface of the second hole 52 is It is pushed upward by the second shaft portion 422 . Therefore, the second member 32 is displaced so that the -Y side end of the second member 32 moves upward.

As shown in FIG. 9C, when the eccentric pin 42 is rotated so that the second central axis C2b is positioned on the -Z side of the first central axis C2a, the inner surface of the second hole 52 moves further downward while being supported by the second shaft portion 422 of the . Therefore, the second member 32 is displaced so that the -Y side end of the second member 32 moves downward.

Thus, the operator can operate the eccentric pin 42 to adjust the position of the second member 32 .

In the present embodiment, the eccentric pin 42 is arranged such that the second member 32 is positioned at the target position while the reference pin 41 is arranged in the first hole 51 and the second shaft portion 422 of the eccentric pin 42 is arranged in the second hole 52 . It is rotated by a specified angle so that it is placed in

The eccentric pin 42 is rotated by a specified angle so that the position of the bobbin case 1 held by the bobbin changing device 22 of the automatic bobbin thread feeder 20 and the position of the hook 14 of the sewing machine 10 are aligned. The operator moves the arm 25 by driving the first driving device 26 so that the position of the bobbin case 1 held by the bobbin changing device 22 of the automatic bobbin thread feeding device 20 and the position of the hook 14 of the sewing machine 10 are aligned. A tool is used to manipulate the eccentric pin 42 in conjunction with the manipulation of the position.

Rotation of the eccentric pin 42 finely adjusts the position of the second member 32 . Thereby, the first member 31 and the second member 32 are properly positioned. In this embodiment, the position of the center hole of the bobbin case 1 held by the bobbin changing device 22 of the automatic bobbin thread feeder 20 and the position of the hook shaft 14S of the hook 14 of the sewing machine 10 are aligned with each other. The position of member 32 is finely adjusted.

After the eccentric pin 42 is rotated at a specified angle and the first member 31 and the second member 32 are properly positioned, the first member 31 and the second member 32 are fixed with the bolts 61 and 62 . As a result, the sewing machine 10 and the automatic bobbin thread feeder 20 are connected to each other in a state in which the bobbin case 1 held by the bobbin changer 22 of the automatic bobbin thread feeder 20 and the hook 14 of the sewing machine 10 are properly positioned. 30. In this embodiment, the first member 31 and the second member 32 are positioned so that the position of the center hole of the bobbin case 1 held by the bobbin exchanging device 22 and the position of the hook shaft 14S of the hook 14 are aligned. be done. Therefore, contact between the bobbin case 1 and the hook shaft 14S of the hook 14 is suppressed during bobbin replacement work. In addition, the eccentric pin 42 is fixed from the side by the set screw 37 so as not to rotate, and the rotation angle of the eccentric pin 42 is fixed, thereby maintaining the positioned state.

[effect]
As described above, according to this embodiment, the connection mechanism 30 has the reference pin 41 and the eccentric pin 42 . The eccentric pin 42 is rotatably supported in the second support hole 34B of the first member 31 . Therefore, the operator can finely adjust the position of the second member 32 by rotating the eccentric pin 42 . Thereby, the relative positions of the first member 31 and the second member 32 are finely adjusted. By finely adjusting the relative positions of the first member 31 and the second member 32, the sewing machine 10 fixed to the first member 31 and the bobbin thread automatic feeder 20 fixed to the second member 32 are separated. properly positioned. Therefore, contact between the bobbin case 1 and the hook 14 is suppressed during bobbin replacement work. Since contact between the bobbin case 1 and the hook 14 is suppressed during bobbin replacement work, at least one of the bobbin case 1 and the hook 14 is prevented from being worn or damaged.

Further, in this embodiment, the reference pin 41 is supported by the first support hole 34A, and the first shaft portion 421 of the eccentric pin 42 is supported by the second support hole 34B. This suppresses variation in the relative position between the reference pin 41 and the first shaft portion 421 of the eccentric pin 42 in the YZ plane. The reference pin 41 is a round pin, and the first hole 51 in which the reference pin 41 is arranged is a circular hole. The second hole 52, in which the second shaft portion 422 of the eccentric pin 42 is arranged, is a horizontally elongated hole. Further, in this embodiment, the reference pin 41 and the eccentric pin 42 are arranged substantially horizontally. As a result, the operator can smoothly and finely adjust the positions of the second member 32 and the bobbin thread automatic feeder 20 fixed to the second member 32 simply by operating the eccentric pin 42 .

Further, after the positioning adjustment, the eccentric pin 42 is fixed by the setscrew 37 to fix the rotation angle of the eccentric pin 42, thereby maintaining the position-adjusted state. As a result, even when the automatic bobbin thread feeder 20 is detached and then reattached, it can be reattached without adjusting the positioning.

Note that in the above-described embodiment, the first member 31 is detachably fixed to the frame 13 of the sewing machine 10 and is not a component of the sewing machine 10 . The first member 31 may be integrated with the frame 13 of the sewing machine 10 or may be a component of the sewing machine 10 .

In the above-described embodiment, the second member 32 may be integrated with the frame 29 of the automatic bobbin thread feeder 20 or may be detachably fixed to the frame 29 . That is, the second member 32 may be a constituent element of the automatic bobbin thread feeding device 20 or may not be a constituent element of the bobbin thread automatic feeding device 20 .

In the above-described embodiment, the first member 31 that supports the reference pin 41 and the eccentric pin 42 is fixed to the sewing machine 10, and the second member 32 having the first hole 51 and the second hole 52 is the automatic bobbin thread feeder. It was decided to be fixed to the device 20 . That is, the sewing machine 10 is provided with the connection mechanism 30 including the first member 31 , the reference pin 41 and the eccentric pin 42 . The first member 31 supporting the reference pin 41 and the eccentric pin 42 may be fixed to the automatic bobbin thread feeder 20 , and the second member 32 having the first hole 51 and the second hole 52 may be fixed to the sewing machine 10 . That is, the connection mechanism 30 including the first member 31 , the reference pin 41 and the eccentric pin 42 may be provided in the automatic bobbin thread feeder 20 .

Reference Signs List 1 bobbin case 10 sewing machine 11 sewing machine head 12 table 13 frame 14 hook 14S hook shaft 15A contact surface 15B contact surface 15S projecting portion 15T projecting portion , 16A... screw hole, 16B... screw hole, 20... automatic bobbin thread feeding device, 21... bobbin conveying device, 22... bobbin changing device, 23... bobbin thread winding device, 24... residual thread removing device, 25... arm, 26 First driving device 27 Second driving device 28 Drive shaft 29 Frame 30 Connection mechanism 31 First member 31A Bracket portion 31B Bracket portion 31C Connection portion 32 Second member 33A First contact surface 33B Second contact surface 33S First protrusion 33T Second protrusion 34A First support hole 34B Second support hole 35A Screw hole , 35B... screw hole, 36A... opening, 36B... opening, 37... set screw, 38... screw hole, 41... reference pin, 42... eccentric pin, 43... positioning pin, 44... groove, 51... first hole, 52 Second hole 53 Third hole 61 Bolt (fixing member) 62 Bolt (fixing member) 63 Bolt 64 Bolt 411 First portion 412 Second portion 421 Third 1st shaft part 422... Second shaft part AX... Rotating shaft C1... Central axis C2a... First central axis C2b... Second central axis.

Claims (8)

a first member fixed to one side of a sewing machine having a hook in which a bobbin case is accommodated and an automatic bobbin thread feeding device that automatically replaces the bobbin case with respect to the hook of the sewing machine;
a reference pin that is a round pin that is inserted into a circular first hole of a second member supported by the first member and fixed to the other of the sewing machine and the automatic bobbin thread feeding device;
an eccentric pin having a first shaft portion that is rotatably supported by the first member and a second shaft portion that is inserted into a second hole that is a horizontally elongated hole of the second member;
the first shaft portion has a surface disposed around a first central axis;
the second shaft portion has a surface disposed around a second central axis;
The first central axis and the second central axis are parallel, and the position of the first central axis and the position of the second central axis are different in a plane orthogonal to the first central axis,
the distance between the second central axis and the surface of the second shaft portion is greater than the distance between the first central axis and the surface of the first shaft portion;
the reference pin and the eccentric pin are arranged substantially horizontally,
The eccentric pin is rotated by a specified angle in a state in which the reference pin is arranged in the first hole and the second shaft portion of the eccentric pin is arranged in the second hole,
The eccentric pin is rotated by the specified angle so that the position of the bobbin case held by the automatic bobbin thread feeder coincides with the position of the hook of the sewing machine.
attachment mechanism. The eccentric pin has a first shaft portion having a surface arranged around a first central axis and a second shaft portion having a surface arranged around a second central axis,
The first central axis and the second central axis are parallel,
In a plane orthogonal to the first central axis, the position of the first central axis is different from the position of the second central axis,
the distance between the second central axis and the surface of the second shaft portion is greater than the distance between the first central axis and the surface of the first shaft portion;
The first shaft portion of the eccentric pin is supported by the first member,
the second shaft portion of the eccentric pin is arranged in the second hole,
A relative position between the reference pin and the first shaft portion of the eccentric pin is fixed in a plane orthogonal to the first central axis;
The connection mechanism according to claim 1. The first member and the second member are fixed by a fixing member while the eccentric pin is rotated at the specified angle.
The connecting mechanism according to claim 1 or 2 . The rotation angle of the eccentric pin is fixed while the eccentric pin is rotated at the specified angle.
The connection mechanism according to any one of claims 1 to 3 . A sewing machine comprising the connection mechanism according to any one of claims 1 to 4 . The sewing machine according to claim 5 , wherein one of the first member and the second member is integral with the sewing machine. An automatic bobbin thread feeder comprising the connection mechanism according to any one of claims 1 to 4 . The automatic bobbin thread feeding device according to claim 7 , wherein one of the first member and the second member is integrated with the automatic bobbin thread feeding device.

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