JP6581853B2 - Hole sewing machine - Google Patents

Description

  The present invention relates to a hole sewing machine.

The hole sewing machine is provided below the needle plate, a needle swing mechanism that swings the needle along the direction perpendicular to the longitudinal direction of the button hole, a cloth feed mechanism that moves the fabric along the longitudinal direction of the button hole, A lower thread cutting mechanism that cuts the lower thread at the end of sewing, and a lower thread capturing mechanism that is provided below the lower thread cutting mechanism and captures the lower thread at a fixed position.
When sewing, the fabric feed mechanism moves the fabric along the button hole, while the needle swing mechanism swings around the button hole while moving the sewing needle up and down to perform zigzag stitching. When the needle drop of the final needle is finished at one end of the lower thread, the lower thread catching mechanism holds the lower thread in a fixed position, and the lower thread is cut by the lower thread cutting mechanism.

  Further, the lower thread catching mechanism is configured such that the thread catching plate having a concave notch and the thread catching plate that brings the lower thread closer to the yarn catching plate are in sliding contact with each other in the deepest portion of the concave notch. The lower thread was held (for example, refer to Patent Document 1).

JP 2000-271371 A

However, in the conventional hole sewing machine, the lower thread catching position by the lower thread catching mechanism is fixed on the extension line of the button hole.
On the other hand, the position of the final needle of the hole stitching is not limited to the extension line of the button hole, but can be the left side or the right side of the button hole.
Thus, when the position of the final needle is set to the left or right side with respect to the extension line of the button hole, the lower thread extending from the fabric to the lower thread capturing position by the lower thread capturing mechanism is slanted, and the lower thread is There has been a problem that the length of the remaining end of the lower thread on the fabric side after cutting by the cutting mechanism becomes long.

  An object of the present invention is to provide a boring machine capable of shortening the remaining end of the lower thread.

The invention according to claim 1 is a boring machine,
A needle up-and-down movement mechanism that raises and lowers the sewing needle;
A moving mechanism that moves the sewing needle along a direction orthogonal to the longitudinal direction of the button hole, relative to the workpiece;
A feed mechanism that moves the workpiece in a direction along the longitudinal direction of the button hole relative to the sewing needle;
A lower thread cutting mechanism that is provided on the lower side of the sewing product at the time of sewing and cuts the lower thread;
In a boring machine provided with a lower thread catching mechanism that is provided on the lower side of the lower thread cutting mechanism and catches the lower thread at the time of cutting ,
The lower thread catching mechanism includes a thread catching member and a thread take-up member that move in directions close to each other in a direction perpendicular to the longitudinal direction of the button hole and stop and catch in a state where the lower thread is pinched , An adjustment unit is provided that adjusts a stop position at the time of catching the lower thread of the thread catching member in a direction perpendicular to the longitudinal direction of the button hole.

The invention according to claim 2 is the boring machine according to claim 1,
The adjusting unit is a stopper that determines a stop position of the yarn catching member, and the stopper can change and adjust a contact position with the yarn catching member.

According to a third aspect of the present invention, there is provided the boring machine according to the first aspect.
The lower thread catching mechanism includes a catching actuator that performs a lower thread catching operation of the thread catching member,
The adjusting unit controls the capturing actuator to adjust the stop position of the yarn capturing member in a direction orthogonal to the longitudinal direction of the button hole.

According to a fourth aspect of the present invention, there is provided the boring machine according to the third aspect,
A control device that controls the needle up-and-down movement mechanism, the needle swinging mechanism, and the feed mechanism, and performs a hole stitching around the button hole or the formation position of the button hole;
The adjusting unit controls the capturing actuator so that the stop position of the thread capturing member is moved in the same direction as the needle drop position of the final needle of the hole stitching with respect to the button hole or the button hole planned formation position. It is characterized by.

  The present invention includes an adjustment unit that adjusts the stop position when the yarn catching member that catches the lower thread is caught in a direction perpendicular to the longitudinal direction of the button hole. In any case, even when the needle drop of the final stitch of the hole stitching is performed, the lower thread can be caught in the same direction, and the inclination of the lower thread from the sewing object to the catching position is reduced and brought closer to the vertical. It is possible to make the remaining end after cutting the lower thread shorter.

It is a perspective view of the hole sewing machine which is an embodiment of the invention. It is the schematic of the internal structure of a hole sewing machine. It is a bottom view of a lower thread catching mechanism and a lower thread cutting mechanism. It is sectional drawing of the thread | yarn catching member and thread | yarn threading member of a lower thread | yarn catching mechanism. It is a perspective view around a stopper of the lower thread catching mechanism. FIG. 6A shows a state where the stop position of the yarn catching member is adjusted to the right by the stopper, and FIG. 6B is an explanatory diagram showing a state where the stop position of the yarn catching member is adjusted to the left by the stopper. FIG. 7A is an explanatory view showing the needle drop position of the final needle, and FIG. 7B is an explanatory view showing the capture position of the thread catching member whose stop position is adjusted in accordance with the needle drop position of the final needle. is there. FIG. 8A is an explanatory view showing the needle drop position of the final needle, and FIG. 8B is an explanatory view showing the capture position of the thread catching member whose stop position is adjusted in accordance with the needle drop position of the final needle. is there. FIG. 9A is an explanatory diagram showing the needle drop position of the final needle, and FIG. 9B is an explanatory diagram showing the capture position of the thread catching member whose stop position is adjusted in accordance with the needle drop position of the final needle. is there. It is a block diagram which shows the control system of a hole sewing machine. FIG. 11A is a plan view of a collar as another example of the adjusting portion, and FIG. 11B is a front view. FIG. 12 is a partial cross-sectional view of an adjustment body as another example of the adjustment unit. FIG. 13 is a bottom view of another example of the lower thread catching mechanism.

[Outline of the hole sewing machine]
Hereinafter, a hole sewing machine 100 according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a perforated sewing machine 100, and FIG. 2 is a schematic view of its internal configuration. In the following description, the horizontal direction and the cloth feed direction by the boring machine 100 are referred to as the Y-axis direction, the horizontal direction that is orthogonal to the Y-axis direction is referred to as the X-axis direction, and the vertical vertical direction is referred to as the Z-axis direction. Shall. As necessary, as shown in FIG. 1, one in the Y-axis direction is “front”, the other is “rear”, one in the X-axis direction is “right”, and the other is “left”.

The hole sewing machine 100 includes a feed plate 71 as a placement portion on which a workpiece is placed, and the feed plate 71 is arranged along a certain feed direction (hereinafter referred to as “cloth feed direction (Y-axis direction)”). The cloth feed mechanism 70 as a feed mechanism that feeds the workpiece by moving the needle, the needle up-and-down movement mechanism 20 that moves the sewing needle 1 up and down, and the direction perpendicular to the feed direction (X-axis direction) A needle swinging mechanism 270 as a moving mechanism to be moved along, a cloth presser 41 as a pressing member for holding the sewing product on the feed plate 71 from above, and sewing on the feed plate 71 by the cloth presser 41. A press-up mechanism 40 for holding an object, a female mechanism 60 for forming a button hole for performing a hole sewing on a sewing object, a thread tension device 11 for applying tension to an upper thread, and a hook that entangles an upper thread with a lower thread Mechanism and upper thread cutting that cuts the upper thread A lower thread cutting mechanism 50 that cuts the lower thread, a lower thread catching mechanism 80 that catches the lower thread, a control device 90 that controls the operation of each of the above parts, and each of the above components is stored and held. The sewing machine frame 101 is provided. Then, through the cooperation of the cloth feed mechanism 70 (feed mechanism), the needle up-and-down moving mechanism 20 and the needle swing mechanism 270, the hole sewing is performed on the workpiece placed on the feed plate 71 (mounting portion). .
Since the thread tension device 11 and the upper thread cutting device of the above-described hole sewing machine 100 are the same as those conventionally known, detailed description thereof is omitted.
Further, the above-described sewing machine 100 is a sewing machine which is a sewing object to be sewn on which a hole for performing the sewing is formed. Note that this hole is not limited to a button hole, but it is possible to target all holes that require over stitching, but here, a button hole along the Y-axis direction is illustrated.

[Sewing frame]
The sewing machine frame 101 constitutes a lower part of the boring machine 100 and extends along the Y-axis direction, a standing body 103 erected from the rear end of the bed 102, and a standing body The arm portion 104 extends from the upper end portion 103 to the front along the Y-axis direction.
The bed portion 102 is formed in a substantially rectangular parallelepiped shape, and the rectangular upper surface portion has a long side along the Y-axis direction. And the upper surface of the bed part 102 becomes a work area | region where a to-be-sewn material is mounted at the time of sewing.
The standing trunk portion 103 is disposed close to the left side on the upper surface rear end portion side of the bed portion 102. Thereby, the substantially right half of the upper surface of the bed part 102 can be used as a work area in which the workpiece is placed over the entire length in the Y-axis direction.
The arm portion 104 extends forward from the upper end portion of the standing trunk portion 103 to the vicinity of the front end portion of the bed portion 102. In the following description, the end surface of the front end portion of the arm portion 104 is referred to as a surface portion 105.

[Needle vertical movement mechanism]
The needle up-and-down movement mechanism 20 has a function of giving a vertical movement operation of the needle bar 21 that holds the sewing needle 1. Further, while the needle bar 21 moves up and down, the needle bar 21 swings along the X-axis direction by the needle swinging mechanism 270 provided along with the needle up-and-down moving mechanism 20, and the sewing needle 1 swings. As shown in FIG. 2, the needle up-and-down movement mechanism 20 includes a needle bar 21 that holds the sewing needle 1 at the lower end, a sewing machine motor 22 that serves as a drive source for the vertical movement of the needle bar 21, and a sewing machine. An upper shaft 23 directly connected to the output shaft of the motor 22, a counterweight 24 fixedly provided at the front end portion of the upper shaft 23, and a crank having an upper end connected to an eccentric position from the rotation center of the counterweight 24 A rod 25 is provided.

The upper shaft 23 is rotatably supported inside the arm portion 104 in a state along the Y-axis direction. The output shaft of the sewing machine motor 22 is connected to the upper shaft 23.
The lower end of the crank rod 25 is connected to the needle bar 21 via a needle bar holder 31 so as to be rotatable about the Y axis. Therefore, when the counterweight 24 is rotated through the upper shaft 23 by driving the sewing machine motor 22, the upper end portion of the crank rod 25 connected to the eccentric position performs a circular motion, but the lower end portion thereof is in contact with the needle bar 21. Only the reciprocating motion in the vertical direction along is transmitted.

[Needle swing mechanism]
The needle swing mechanism 270 includes a swing base 26 that supports the needle bar 21 so as to be movable along its longitudinal direction, a needle swing motor 27 (see FIG. 10) that serves as a drive source for needle swing, and a needle swing motor 27. And a swing arm 29 fixed to the front end of the swing shaft 28 and imparting a swing motion to the swing base 26.

  The oscillating base 26 is disposed inside the arm portion 104 and in the immediate vicinity of the surface portion 105, and an upper end portion thereof is supported by a step screw 30 along the Y-axis direction so as to be swingable. The swinging table 26 supports the needle bar 21 so that the needle bar 21 can slide up and down with two metal bearings (not shown) inserted through the needle bar 21 with the sewing needle 1 side facing downward.

The swing shaft 28 is rotatably supported in the arm portion 104 in a state along the Y-axis direction. The swinging shaft 28 is rotated by a needle swing motor 27 from the rear end side.
Further, the swing arm 29 is pivotally supported on the front end side of the swing shaft 28 in a state where the swing end portion is directed downward, and the swing end portion is rotatable about the Y axis. In this state, a square piece 32 is equipped. The square piece 32 is fitted in the recess of the swing base 26. The concave portion of the oscillating base 26 includes opposing surfaces that are in sliding contact with both side surfaces of the square piece 32 in the X-axis direction, and allows displacement of the square piece 32 in the Z-axis direction. Therefore, if the swing arm 29 swings in the downward direction in the X-axis direction, the swing in the X-axis direction is imparted to the swing base 26 while allowing the square piece 32 to be displaced in the vertical direction. Is done.
Accordingly, by dropping the needle bar 21 by a predetermined amount in accordance with the needle drop timing of the needle bar 21 by the sewing machine motor 22, the needle drop can be performed at an arbitrary position in the X-axis direction.

[Hook mechanism]
The shuttle mechanism transmits torque to the lower shaft 33 that is rotatably supported in the Y-axis direction in the bed portion 102, the vertical shuttle 34 that is rotated by the lower shaft 33, and the lower shaft 33. For this purpose, a driving sprocket 35 mounted on the upper shaft 23, a driven sprocket (not shown) mounted on the lower shaft 33, and a toothed timing belt 36 spanned between the driving sprocket 35 and the driven sprocket are provided. ing.
The number of teeth of the main sprocket 35 and the driven sprocket is set so that the double speed rotation is transmitted from the upper shaft 23 to the lower shaft 33, and the vertical shuttle for each vertical movement of the sewing needle 1. Reference numeral 34 is configured to perform two rotations.
The vertical hook 34 includes an outer hook that is fixedly attached to the lower shaft 33 and includes a sword tip, and an inner hook that holds a bobbin case and does not rotate. As the vertical hook 34, a so-called DP hook that can maintain a perfect stitch for both forward and rear cloth feeds is used.

[Female mechanism]
The knife mechanism 60 includes a cloth cutting knife 61 that forms a hole (button hole) for performing hole sewing by a cut along the Y-axis direction, a base member 62 that holds the cloth cutting knife 61, and a base member 62 at the lower end. And a solenoid 63 (see FIG. 10) as a drive source for applying a lifting operation to the cloth cutting knife 61 via the knife support bar. ).
The cloth cutting knife 61 is provided behind the sewing needle 1 and supported by the base member 62 so that the blade surface thereof is parallel to the YZ plane. Therefore, by lowering the cloth cutting knife 61, it is possible to form a button hole along the Y-axis direction in the sewing product.
The base member 62 allows the cloth cutting knife 61 to be attached and detached. The base member 62 can be replaced with a cloth cutting knife 61 having a different tooth width to form button holes having different sizes.
The knife support bar is always urged upward by a tension spring (not shown), and the solenoid 63 lowers the cloth cutting knife 61 against the tension spring at the time of cutting.

[Cloth feed mechanism]
The cloth feed mechanism (feed mechanism) 70 is slidable along the Y-axis direction by a rectangular feed plate 71 disposed on the upper surface of the bed portion 102 and two guide shafts 72 and 72 in the bed portion 102. A supported feed base 73, a feed motor 74 as a driving source for cloth feed in the Y-axis direction, and a timing belt 76 stretched between two pulleys 75, 75 are provided.
The guide shafts 72 and 72 are fixedly supported in the bed portion 102 in a state parallel to the Y-axis direction.

  The feed plate (mounting portion) 71 is arranged on the upper surface of the bed portion 102 so that the long side thereof is parallel to the Y-axis direction, and is located near the front end portion of the feed plate (mounting portion) 71 near the Y axis. A long hole 711 along the direction is formed to penetrate in the vertical direction. The long hole 711 is formed with a width that is sufficiently wider than the needle swinging width, and a slit-like opening along the Y-axis direction through which the cloth cutting knife is inserted and needle swinging are allowed below the feed plate 71. A needle plate 82 (not shown in FIG. 1) in which a needle hole along the X-axis direction is formed is disposed.

The feed base 73 is slidably supported by guide shafts 72 and 72 via a sliding bearing (not shown), and holds the feed plate 71 at the upper part thereof.
One of the two pulleys 75, 75 is attached to the output shaft of the feed motor 74, and the other is rotatably supported on the inner wall of the bed portion 102. The pulleys 75 and 75 are both rotatable around the X axis, and the timing belt 76 stretched between them is arranged in a state along the Y axis direction.
The timing belt 76 is partially connected to the lower portion of the feed base 73. When the feed motor 74 is driven to rotate, the feed base 73 and the feed plate 71 are moved in the Y-axis direction via the timing belt 76. To move to.

  Accordingly, the workpiece to be sewn held by the cloth feed 41 on the upper surface of the feed plate 71 can be arbitrarily moved and positioned in the Y-axis direction by the operation control with respect to the feed motor 74. As described above, since the sewing needle 1 can perform needle dropping at an arbitrary position in the X-axis direction by the needle up-and-down movement mechanism 20, the needle up-and-down movement mechanism 20 and the cloth feed mechanism 70 cooperate with each other. Thus, the needle drop can be performed at an arbitrary position on the XY plane with respect to the sewing object.

[Holding mechanism]
The presser lifting mechanism 40 is a cloth presser 41 (presser member) that presses the workpiece on the upper surface of the feed plate 71, a presser arm 43 that supports the presser foot 41, and a pressurizing body that presses the presser arm 43 downward. A slide roller 44 and a presser motor 49 that raises and lowers the cloth presser 41 against the slide roller 44 are provided.
The pressing arm 43 is long along the Y-axis direction, and its rear end is supported on the upper surface of the feed plate 71 so as to be rotatable around the X-axis. Thus, the cloth presser 41 supported on the front end of the presser arm 43 can be moved up and down.
The cloth presser 41 is a rectangular flat plate along the XY plane, and an opening is formed in the center of the cloth presser 41 within a range where a hole seam can be formed.
Since the slide roller 44 rolls along the upper surface of the pressing arm 43 along the Y-axis direction, even when the pressing arm 43 moves along the Y-axis direction, the downward pressing force is not disturbed. Can be granted.

[Lower thread catching mechanism]
FIG. 3 is a bottom view of the lower thread cutting mechanism 50 and the lower thread catching mechanism 80.
As shown in the figure, the lower thread catching mechanism 80 includes a needle plate base 81 fixedly mounted on the bed portion 102 below the feed plate 71, a needle plate 82 provided on the upper surface of the needle plate base 81, and a needle plate. Thread catching operation on the thread take-up member 83 and the thread take-up arm 84 provided on the bottom side of the table 81, the thread catching member 85 and the thread catching arm 86 provided on the bottom side of the needle plate table 81, and the thread catching arm 84 Are mainly provided with a transmission link 87 for applying the rotational force of the motor and an actuator 56 made of a motor, a solenoid or an air cylinder for moving the transmission link 87 up and down.

  The needle plate base 81 is a substantially rectangular flat plate along the XY plane, and an opening 811 is formed at the center. A needle plate 82 is provided in a suspended state in the opening 811 of the needle plate base 81. The needle plate 82 is a long flat plate along the Y-axis direction, and a slit-shaped insertion hole along the Y-axis direction through which the cloth cutting knife 61 is inserted and a slit along the X-axis direction that allows needle swinging. A penetrating needle hole is formed adjacently. That is, the needle plate 82 is disposed at the needle drop position on the needle plate base 81 and the lowering position of the cloth cutting knife 61.

  The opening 811 of the needle plate base 81 is formed within a range in which the needle drop and the cloth cutting knife 61 can be allowed to fall, and the upper and lower knife 51, 52 of the lower thread cutting mechanism 50 described later is provided inside the opening 811. Are formed so as to allow a cutting operation by the upper and lower knives 51 and 52.

  The thread take-up arm 84 is a plate-shaped bell crank along the XY plane, and is attached to the rear side of the opening 811 on the bottom surface of the needle plate base 81 so as to be rotatable around the Z axis by a step screw. . Then, the base end portion of the thread take-up member 83 is fixedly equipped with a screw on one of the rotating arm portions extending generally forward from the step screw serving as the rotating shaft. In addition, one end portion of the transmission link 87 is connected to the other rotation arm portion extending substantially rearward from the step screw serving as the rotation shaft so as to be rotatable about the Z axis. Then, when performing the lower thread catching operation, the leftward tension is input from the transmission link 87, and the thread pulling arm 84 performs the clockwise rotation operation in FIG.

  Further, the thread take-up arm 84 is formed with a protrusion 841 protruding forward in the vicinity of the rotation center position. The protruding portion 841 is disposed so as to abut on a convex portion 861 formed on an outer edge portion of the yarn catching arm 86 described later, and when performing the lower thread catching operation, the thread catching arm 86 is engaged with the yarn catching arm 86. It acts to perform interlocking rotation in the reverse direction to 84.

The thread take-up member 83 has a long plate shape along the XY plane, and a base end portion thereof is fixedly connected to a rotating end portion of the thread take-up arm 84, and a tip end portion extends substantially forward. Yes. The thread thread member 83 performs a rotation operation integrally with the thread thread arm 84 when performing the lower thread capturing operation.
The thread take-up member 83 stands by to the left of the needle hole before the start of the lower thread catching operation, and rotates to the right when the lower thread catching operation is started. Accordingly, the lower thread can be brought into contact with the lower thread at the right edge portion of the thread take-up member 83 and moved toward the thread catching member 85 located on the right side.

The thread catching arm 86 is a plate-shaped bell crank along the XY plane, and is attached to the right side of the opening 811 on the bottom surface of the needle plate base 81 by a step screw so as to be rotatable around the Z axis. And the base end part of the thread | yarn catching member 85 is fixedly equipped by the screw to one rotation arm part extended toward the front substantially from the step screw used as a rotating shaft. In addition, a tension spring that imparts counterclockwise rotation in FIG. 3 to the thread catching arm 86 is provided on the other rotation arm portion extending substantially rightward from the step screw serving as the rotation axis. 88 are connected. The opposite end of the tension spring 88 is screwed to the needle plate base 81.
Further, the yarn catching arm 86 has a convex portion 861 extending to the left of the step screw serving as the rotation axis, and the outer edge portion on the rear side of the convex portion 861 is the above-described thread-trimming arm. 84 projecting parts 841 abut. The function of the convex portion 861 will be described later.

The yarn catching member 85 has a flat plate shape along the XY plane, the base end portion extends linearly rearward, bends 90 ° to the left at the middle portion, and the tip end portion is substantially rectangular. It has become.
A V-shaped cutout 851 that opens to the left is formed at the left edge of the tip of the yarn catching member 85. When catching the lower thread, the thread take-up member 83 rotates clockwise, and the thread catching member 85 rotates counterclockwise, bringing the lower thread closer to the deepest part (rightmost side) of the notch 851. Thus, the lower thread is captured when the right edge of the thread take-up member 83 passes through the deepest part of the notch 851.

  As shown in FIG. 4, the yarn catching member 85 is positioned above the thread catching member 83, and the lower surface of the yarn catching member 85 and the upper surface of the thread catching member 83 are in sliding contact with each other. For this reason, when catching the lower thread, the lower thread is pulled between the thread catching member 83 and the thread catching member 85 and is held. As a result, a downward tension is applied to the lower thread, and the sewing product is somewhat pulled downward. Since the lower thread cutting mechanism 50 described later cuts the lower thread in this state, the remaining end of the lower thread of the sewing product can be shortened.

Here, the function of the convex portion 861 of the yarn catching arm 86 will be described.
As described above, the yarn catching arm 86 is given a counterclockwise turning force by the tension spring 88, and thus the yarn catching member 85 is given a turning force in the operation direction at the time of catching the yarn. It is in the state.
On the other hand, before the thread catching operation is started, the thread take-up arm 84 receives counterclockwise turning force from the transmission link 87 so that the thread take-up member 83 is in the standby position (position leftward from the needle hole). Has been. At this time, the protruding portion 841 of the thread take-up arm 84 presses the convex portion 861 of the yarn catching arm 86, pushes the yarn catching arm 86 clockwise against the tension spring 88, and the yarn catching member 85 is in the standby position. Maintain the position so that it is at the right side of the needle hole.
Furthermore, since the clockwise turning force is input from the transmission link 87 to the thread catching arm 84 at the time of catching the yarn, the yarn catching arm 86 rotates counterclockwise according to the tension of the tension spring 88. For this reason, the thread take-up member 83 rotates to the right and the thread catching member 85 rotates to the left in conjunction.
In other words, the convex portion 861 of the yarn catching arm 86 is in the direction in which the thread take-up member 83 and the yarn catching member 85 approach each other from the state where the thread catching member 83 and the yarn catching member 85 are located at the respective standby positions in cooperation with the protrusion 841 of the thread take-up arm 84. Rotate in conjunction with. Accordingly, as described above, the lower thread can be guided and held at the deepest portion of the notch 851 of the thread catching member 85.

  Further, the lower thread catching mechanism 80 includes a stopper 89 as an adjustment unit that adjusts the stop position at the time of catching of the thread catching member 85 that catches the lower thread in the X-axis direction. By adjusting the stop position at the time of catching the yarn catching member 85 in the X-axis direction, the tilt angle at the time of cutting the lower thread can be adjusted.

As shown in FIGS. 3 and 5, the stopper 89 is configured by an eccentric screw in which the outer periphery of the head portion 891 abuts on the left edge portion of the base end portion of the yarn catching member 85. That is, the stopper 89 is provided at a position where a screw shaft 892 screwed into a screw hole formed on the bottom surface of the needle plate base 81 is eccentric from the center of the head 891. Thereby, by rotating the stopper 89, the amount of eccentricity of the head 891 in the X-axis direction varies, and the yarn catching operation of the yarn catching member 85 as shown in FIGS. 6 (A) and 6 (B). The stop position at the time can be adjusted.
Reference numeral 893 denotes a nut that prevents the stopper 89 that performs rotation adjustment from being loosened.

As shown in FIG. 7, the stopper 89 captures the deepest portion of the notch 851 of the thread catching member 85 when the eccentric amount of the head 891 is equal on both the left and right sides in the X-axis direction (the neutral position). The stop position at that time can be made to coincide with the position directly below the tip of the sewing needle 1 in a state where it is not swung to the left or right (the neutral position).
In addition, as shown in FIG. 8, when the eccentric amount of the head 891 is maximized on the left side in the X-axis direction, the stopper 89 sets the stop position at the time of capturing the deepest portion of the notch 851 of the thread capturing member 85. It can be made to coincide with the position directly below the tip of the sewing needle 1 that is swung to the left most.
Further, as shown in FIG. 9, the stopper 89 sets the stop position at the time of catching the deepest part of the notch 851 of the thread catching member 85 when the eccentric amount of the head 891 is maximized to the right in the X-axis direction. It can be made to coincide with the position directly below the tip of the sewing needle 1 that is swung to the right.

[Lower thread cutting mechanism]
As shown in FIG. 3, the lower thread cutting mechanism 50 includes an upper knife 51 whose base end portion is connected to the bottom left side of the needle plate base 81 and to the left front side of the opening 811 so as to be rotatable about the Z axis; The lower knife 52 is connected to the lower surface of the other end of the upper knife 51 so as to be rotatable about the Z axis, and is connected to the lower surface of the lower knife 52 so as to be rotatable about the Z axis coaxially with the lower knife 52. A leaf spring 53 and an interlocking link 54 for connecting and rotating the upper knife 51 with the thread catching arm 84 of the lower thread catching mechanism 80 are provided.
The upper knife 51, the lower knife 52, and the leaf spring 53 of the lower thread cutting mechanism 50 are located below the needle plate 82 and above the thread catching member 83 and the thread catching member 85 of the lower thread catching mechanism 80. Are arranged as follows.

The upper knife 51 has a plate shape along the XY plane, and as described above, the base end portion is supported by the needle plate base 81 so as to be rotatable around the Z axis, and at the rotation end portion. Has a cutting edge for cutting the lower thread. The cutting edge of the upper knife 51 is formed so as to be substantially along the X-axis direction at the front edge of the rotating end. Before the cutting operation, the cutting edge is in a standby position at the left rear with respect to the needle hole. At the time of cutting, the upper knife 51 rotates counterclockwise in FIG. It is arranged to approach the left side.
The turning operation of the upper knife 51 at the time of cutting is input from the thread take-up arm 84 via the interlocking link 54.

The lower knife 52 has a plate shape along the XY plane, and has a cutting edge that cuts the lower thread in cooperation with the upper knife 51 at the rotation end extending leftward from the rotation center. Is formed. The cutting edge of the lower knife is formed on the rear edge of the rotating end so as to be substantially along the X-axis direction. Before the cutting operation, the cutting edge of the lower knife 52 is in a standby position facing the front side of the cutting edge of the upper knife 51, and at the time of cutting, the cutting edge rotates backward with the rotation of the upper knife 51, and the needle After reaching below the hole, the cutting edges of each other are closed to perform cutting.
The lower knife 52 is formed with a protrusion 521 protruding forward at the front edge, and the protrusion 521 contacts the inner edge of the opening 811 of the needle plate base 81 by the counterclockwise rotation of the upper knife 51. In contact with the upper knife 51, the blade tip is rotated in the closing direction.

The leaf spring 53 has a plate shape along the XY plane, and the shape of the extension end portion extending leftward from the rotation center when viewed from below is the rotation end portion of the upper knife 51. It almost matches. When the lower thread is cut, the rotating end of the lower knife 52 enters between the rotating end of the upper knife 51 and the extending end of the leaf spring 53. As a result, the lower thread is cut between the upper knife 51 and the lower knife 52, and the lower thread cutting end extending from the vertical hook 34 is held between the lower knife 52 and the leaf spring 53.
Reference numeral 55 denotes an operating lever that releases the lower thread by rotating the lower knife 52 in the direction in which the blade edge opens before starting sewing.

[Control system for boring machine]
FIG. 10 is a block diagram showing a control system of the hole sewing machine 100. The hole sewing machine 100 includes a control device 90 as operation control means for controlling the operation of each of the above-described configurations. The control device 90 includes a ROM 92 that stores various control programs, a CPU 91 that executes the control programs, a RAM 93 that serves as a work area for the CPU 91, various sewing pattern data for sewing the hole sewing, and various operations required to control the operation of the sewing machine. An EEPROM 96 capable of storing setting data and rewriting the stored contents is provided.
The CPU 91 also includes a sewing motor 22a connected to the sewing machine motor 22 and an encoder 221 that detects its rotation angle, a needle swing motor driver 27a that drives the needle swing motor 27, and a feed motor driver 74a that drives the feed motor 74. , A pressing motor driver 49a connected to the pressing motor 49 and an encoder 46 for detecting the rotation angle thereof, a driver 56a of an actuator 56 for performing a lower thread catching operation and a lower thread cutting operation, and a solenoid for moving the cloth cutting knife 61 up and down A solenoid driver 63a for driving 63 and a thread tension solenoid driver 111a for driving a thread tension solenoid 111 which is a thread tension driving source of the thread tension device 11 are connected via an interface (not shown).
The CPU 91 is connected to an operation panel 94 for inputting various settings relating to sewing such as selection of sewing pattern data for over-hole sewing and a start switch 95 for inputting the start of sewing.

[Sewing operation of the boring machine]
The sewing operation of the hole sewing machine 100 will be described.
The sewing pattern data recorded in the EEPROM 96 of the above-described perforating sewing machine 100 records data indicating the needle drop position for each stitch of the perforated stitch formed around the button hole.
When the CPU 91 of the control device 90 reads the predetermined sewing pattern data selected by the operation panel 94 from the EEPROM 96, the needle swinging for moving the needles in order to the respective needle drop positions for all the needles from the first needle to the last needle is performed. The operation amounts of the motor 27 and the feed motor 74 are calculated.

When the start switch 95 is pressed, the CPU 91 starts driving the sewing machine motor 22 and starts sewing.
Further, after the drive of the sewing machine motor 22 is started, the encoder 221 reads the shaft angle. When the predetermined shaft angle is reached, the sewing motor 22 is driven based on the calculated movement amounts of the needle swing motor 27 and the feed motor 74, and sewing is performed. The needle 1 is positioned at the target value in the X-axis direction, the workpiece is positioned at the target position in the Y-axis direction, and the needle is moved to the target needle drop position for each stitch.
When the movement of all the needle drop positions determined in the sewing pattern data is completed, the CPU 91 stops the sewing machine motor 22.

It should be noted that it is possible to set in advance whether the button hole is formed by the knife mechanism 60 before or after the hole stitching.
In the case where it is set before the hole sewing, the button hole is formed by the knife mechanism 60 before the driving of the sewing machine motor 22 is started, and then the hole seam is formed around the button hole.
If the setting is made after the hole stitching, the sewing machine motor 22 is first driven to form a hole stitch around the position where the button hole is to be formed. Hole formation is performed.

Further, the CPU 91 cuts the upper thread and the lower thread.
Before starting the lower thread cutting operation, the thread catching member 83 of the lower thread catching mechanism 80 is located at the standby position on the left side of the needle hole, and the thread catching member 85 is located at the standby position on the right side of the needle hole. Then, from these states, the actuator 56 is operated to rotate the thread take-up arm 84 in the clockwise direction in FIG. 3, and turn the thread take-up member 83 toward the needle hole. Further, the thread catching arm 86 is rotated counterclockwise in FIG. 3 in conjunction with the thread pulling arm 84, and the thread catching member 85 is rotated toward the needle hole.
Thereafter, the thread catching member 85 abuts against the stopper 89 and stops rotating at a predetermined position. However, the thread catching member 83 continues to rotate until it passes below the needle hole. As a result, the lower thread is captured at the deepest portion of the notch 851 of the thread capturing member 85 that has stopped first.

Further, as the thread take-up arm 84 rotates clockwise, the upper knife 51 of the lower thread cutting mechanism 50 rotates counterclockwise in FIG. 3 from the standby position and advances toward the needle hole. When the lower thread is captured by the lower thread capturing mechanism 80, the lower thread cutting mechanism 50 closes the blade edge of the upper knife 51 and the blade edge of the lower knife 52, so that the sewing product and the lower thread capturing mechanism 80 are closed. The lower thread stretched between them is cut.
Thereafter, the CPU 91 raises the cloth presser 41 by the presser motor 49 to release the workpiece, and sewing is completed.

  Here, in the sewing pattern data, the needle drop position L of the final needle is set on the extension line of the button hole B as shown in FIG. 7A, and as shown in FIG. 8A. In addition, there are those that are set on the left side with respect to the extension line of the button hole B and those that are set on the right side with respect to the extension line of the button hole B as shown in FIG.

  When the needle drop position L of the final needle is set on the extension line of the button hole B, the stopper 89 is rotated and adjusted in advance to a position where the eccentric amount of the head 891 of the stopper 89 becomes equal to the left and right. As a result, as shown in FIG. 7B, the lower thread captured by the lower thread capturing mechanism 80 is substantially in the Z-axis direction from the sewing object to the thread capturing member 85. In this state, the lower thread is cut When the mechanism 50 performs the cutting, the remaining end of the lower thread on the sewing object side can be further shortened.

Further, when the needle drop position L of the final needle is set on the left side of the extension line of the button hole B, the stopper 89 is previously set at a position where the eccentric amount of the stopper 89 toward the left side of the head 891 becomes large. Adjust the rotation. As a result, as shown in FIG. 8B, the lower thread caught by the lower thread catching mechanism 80 is substantially in the Z-axis direction from the sewing object to the thread catching member 85, and in this state, the lower thread is cut. When the mechanism 50 performs the cutting, the remaining end of the lower thread on the sewing object side can be further shortened.
It is more desirable to adjust the amount of eccentricity of the stopper 89 so that the needle drop position L of the final needle coincides with the position in the X-axis direction of the deepest notch 851 of the yarn catching member 85 at the time of catching the yarn.

Further, when the needle drop position L of the final needle is set on the right side on the extension line of the button hole B, the stopper 89 is previously placed at a position where the amount of eccentricity of the stopper 89 toward the right side of the head 891 becomes large. Adjust the rotation. As a result, as shown in FIG. 9B, the lower thread captured by the lower thread capturing mechanism 80 is substantially in the Z-axis direction from the sewing object to the thread capturing member 85, and in this state, the lower thread is cut. When the mechanism 50 performs the cutting, the remaining end of the lower thread on the sewing object side can be further shortened.
Also in this case, it is more desirable to adjust the amount of eccentricity of the stopper 89 so that the needle drop position L of the final needle coincides with the position in the X-axis direction of the notch 851 of the thread catching member 85 at the time of catching the thread. .

[Technical effects of the embodiment of the invention]
The bobbin thread catching mechanism 80 of the bobbin sewing machine 100 includes a stopper 89 that adjusts a stop position when the bobbin thread is caught by the thread catching member 85 in a direction (X-axis direction) perpendicular to the longitudinal direction of the button hole. Even when the needle drop of the last needle of the over-hole stitching is performed to the left or right of the X-axis direction with respect to the button hole B, the lower thread can be captured in the same direction, and the sewn product can be moved to the captured position. It is possible to reduce the inclination of the passing lower thread and bring it closer to the vertical, and it is possible to shorten the remaining end after cutting the lower thread.
In particular, the adjustment unit for adjusting the stop position when capturing the lower thread in the thread capturing member 85 in the X-axis direction is configured by the stopper 89, so that the lower thread capturing position can be adjusted by a simple operation with a simple operation. Can be done.
In addition, by configuring the adjusting part with the stopper 89, it is possible to provide an adjusting part by an easy modification to the existing boring machine, and the effect of shortening the remaining end after cutting the lower thread can be easily realized. It becomes possible to do.

[Other examples of stoppers]
The stopper 89 serving as the adjusting portion is an eccentric screw, but it goes without saying that other members capable of adjusting the stop position of the yarn catching member 85 in the X-axis direction may be used.
For example, as shown in FIG. 11, a circular collar 89 </ b> A in which a through hole is formed at an eccentric position may be provided at the same position as the stopper 89 with a screw 891 </ b> A. In this case, the thread 891A is loosened and the collar 89A is rotated to change the amount of eccentricity on the yarn catching member 85 side, and the screw 891A is fastened again. As a result, the stop position of the yarn catching member 85 in the X-axis direction can be adjusted.

Further, as shown in FIG. 12, an adjustment body 89 </ b> B that slides in the X-axis direction to adjust the position may be provided at the same position as the stopper 89.
The adjustment body 89B includes a bottom plate portion 891B that is in close contact with the bottom surface of the needle plate base 81, and a standing wall portion 892B that is raised at a right angle from the right end portion of the bottom plate portion 891B and extends along the YZ plane. The right wall surface of 892B contacts the yarn catching member 85 and stops at a predetermined position in the X-axis direction.
A long hole 893B extending in the X-axis direction is formed through the center of the bottom plate portion 891B. A screw 894B is inserted through the long hole 893B and fixed to the bottom surface of the needle plate base 81.
In this case, the screw 894B is loosened to adjust the attachment position of the adjusting body 89B in the X-axis direction, and the screw 894B is fastened again. As a result, the stop position of the yarn catching member 85 in the X-axis direction can be adjusted.
The adjusting body 89B can be formed, for example, by bending a metal plate or processing a sheet metal.

[Other examples of lower thread catching mechanism]
In the above embodiment, the adjustment unit of the lower thread catching mechanism 80 is exemplified by the stopper 89 that requires an adjustment operation by manual operation. It is good also as a structure which has.
For example, a lower thread catching mechanism 80C shown in FIG. 13 is provided on a motor 88C (for example, a stepping motor) that can be controlled by the CPU 91 of the control device 90 as an actuator and an output shaft of the motor 88C. It is good also as a structure provided with the rotation member 881C and the link member 882C which connects the rotation end part of the said rotation arm 881C, and the rotation arm part on the right side of the thread | yarn catching arm 86. FIG. In the case of the lower thread catching mechanism 80C, the protruding portion 841 of the thread catching arm 84 and the tension spring 88 connected to the thread catching arm 86 are removed, and the thread catching arm 84 and the thread catching arm 86 are connected to each other. The other components are the same as those of the lower thread catching mechanism 80.
As a result, the CPU 91 functions as an adjusting portion, and the deepest portion of the notch 851 of the yarn catching member 85 can be arbitrarily positioned in the X-axis direction, so that the remaining end of the lower thread after completion of sewing is made shorter. It becomes possible.

The deepest portion of the notch 851 of the yarn catching member 85 at the time of catching the lower yarn may be set by numerical input from the operation panel 94, for example, for the stop position in the X-axis direction.
Further, the CPU 91 of the control device 90 reads the sewing pattern data selected for sewing, calculates the needle drop position of the final needle in the X-axis direction, and adjusts the value to the notch 851 of the thread catching member 85. The stop position in the X-axis direction of the deepest part may be determined, and the motor 88C may be controlled to be the calculated stop position when the lower thread is captured.
In this case, the stop position in the X-axis direction of the deepest portion of the notch 851 of the thread catching member 85 is preferably matched with the needle drop position of the final needle in the X-axis direction. The needle drop position and the stop position may be moved in the same direction.
In these cases, if the sewing pattern is determined, the proper lower thread is automatically cut, so that it is possible to drastically reduce the work load on the operator of the sewing machine.

[Others]
Although the cloth feed mechanism 70 that moves the workpiece along the Y-axis direction is exemplified as the feed mechanism, the present invention is not limited to this, and the feed mechanism includes a mechanism that moves the sewing needle 1 along the Y-axis direction. Also good.
Further, instead of the needle swing mechanism 270, a moving mechanism that moves the workpiece along the X-axis direction may be provided.

DESCRIPTION OF SYMBOLS 1 Sewing needle 20 Needle up-and-down moving mechanism 21 Needle bar 22 Sewing machine motor 27 Needle swing motor 270 Needle swing mechanism (movement mechanism)
50 Lower thread cutting mechanism 51 Upper knife 52 Lower knife 56 Actuator 70 Cloth feed mechanism (feed mechanism)
80, 80C Lower thread catching mechanism 82 Needle plate 83 Thread picking member 84 Thread picking arm 85 Thread catching member 86 Thread catching arm 88C Motor (capturing actuator)
89 Stopper (Adjustment part)
89A Color (Adjustment part)
89B Regulator (regulator)
90 Controller 91 CPU (Adjustment Unit)
100 Sewing machine B Button hole

Claims (4)

A needle up-and-down movement mechanism that raises and lowers the sewing needle;
A moving mechanism that moves the sewing needle along a direction orthogonal to the longitudinal direction of the button hole, relative to the workpiece;
A feed mechanism that moves the workpiece in a direction along the longitudinal direction of the button hole relative to the sewing needle;
A lower thread cutting mechanism that is provided on the lower side of the sewing product at the time of sewing and cuts the lower thread;
In a boring machine provided with a lower thread catching mechanism that is provided on the lower side of the lower thread cutting mechanism and catches the lower thread at the time of cutting ,
The lower thread catching mechanism includes a thread catching member and a thread take-up member that move in directions close to each other in a direction perpendicular to the longitudinal direction of the button hole and stop and catch in a state where the lower thread is pinched , A boring machine characterized by comprising an adjusting section for adjusting a stop position at the time of catching the lower thread of the thread catching member in a direction orthogonal to the longitudinal direction of the button hole.   2. The boring machine according to claim 1, wherein the adjusting portion is a stopper that determines a stop position of the yarn catching member, and the stopper can change and adjust a contact position with the yarn catching member. . The lower thread catching mechanism includes a catching actuator that performs a lower thread catching operation of the thread catching member,
2. The boring machine according to claim 1, wherein the adjusting unit controls the catching actuator to adjust the stop position of the yarn catching member in a direction orthogonal to the longitudinal direction of the button hole. A control device that controls the needle up-and-down movement mechanism, the moving mechanism, and the feed mechanism, and performs a hole stitching around the button hole or a formation planned position of the button hole;
The adjusting unit controls the capturing actuator so that the stop position of the thread capturing member is moved in the same direction as the needle drop position of the final needle of the hole stitching with respect to the button hole or the button hole planned formation position. The holed sewing machine according to claim 3.

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