TW201718972A - Buttonhole machine capable of shortening the remaining end of a lower thread - Google Patents

Abstract

The subject of the invention is to shorten the remaining end of a lower thread. The solving means is a buttonhole machine comprising an up-down needle motion mechanism, which drives a sewing needle moving up and down; a needle swinging mechanism, which drives the sewing needle moving perpendicular to the long side of a buttonhole; a feeding mechanism, which drives a sewed object moving relative to a direction that the sewing needle moves along the long side of a buttonhole; a lower thread cutting mechanism, which is disposed under a being sewed object and cuts lower threads; and a lower thread capture mechanism, which is disposed under the lower thread cutting mechanism and captures lower threads, wherein, the lower thread capture mechanism comprises an adjustment part, which, in the direction perpendicular to the long side of a buttonhole, adjusts the stop position of a thread capture member while capturing a lower thread.

Description

Buttonhole machine

The invention relates to a buttonhole machine.

BACKGROUND OF THE INVENTION A keyhole machine includes a needle-needle mechanism that swings a needle in a direction orthogonal to a longitudinal direction of a buttonhole, and a cloth feeding mechanism that moves the cloth in a longitudinal direction of the buttonhole, and is disposed below the needle plate, and The lower thread cutting mechanism that cuts the lower thread at the end of the sewing and the lower thread catching mechanism that is disposed below the lower thread cutting mechanism and captures the lower thread at the fixed position. Moreover, at the time of sewing, the feeding mechanism moves the cloth along the grommets, and the needle-needle mechanism performs a needle-needle on the side of the grommets, and the needle is moved up and down to lock the seam in a zigzag manner, at one end of the grommets When the side ends the needle drop of the final needle, the lower thread catching mechanism is kept in the lower position at the fixed position, and the lower thread is cut off by the lower thread cutting mechanism.

Further, the lower thread catching mechanism slidably contacts the wire catching plate having the concave notch and the drawing plate on the side closer to the wire catching plate in the direction in which the lower wire is in close proximity to each other, and performs the lower thread at the deepest portion of the concave notch. This is maintained (see, for example, Patent Document 1). Prior Technical Literature Patent Literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2000-271371

SUMMARY OF THE INVENTION However, in the above-described conventional buttonhole sewing machine, the capture position of the lower line by the lower thread catching mechanism is fixed to the extension line of the grommets. In contrast, the position of the final needle of the keyhole is not limited to the extension line of the buttonhole, and may be set to the left or right side of the buttonhole. In this way, when the position of the final needle is set to the left side or the right side with respect to the extension line of the buttonhole, the lower line of the line capturing position from the cloth covering to the lower line capturing mechanism is inclined, and the following line is generated on the lower line. The length of the stump on the fabric side of the lower thread after the cutting by the cutting mechanism becomes long.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a keyhole machine which can shorten the stump of a lower thread. Means to solve the problem

(1) The present invention is a keyhole machine comprising: a needle up and down mechanism for moving a needle up and down; and a moving mechanism for moving the needle along a direction orthogonal to a longitudinal direction of the buttonhole; the feeding mechanism The sewing material relatively moves in a direction along the longitudinal direction of the grommets with respect to the sewing needle; the lower thread cutting mechanism is disposed at a lower side of the workpiece to be sewn at the time of sewing, and cuts the lower thread; and the lower thread catching mechanism Provided on the lower side of the lower thread cutting mechanism and capturing the lower thread, wherein the lower thread catching mechanism includes: a line catching member that captures the lower thread, and adjusts the capturing lower line in a direction orthogonal to a longitudinal direction of the buttonhole The adjustment portion of the stop position of the line catching member at the time.

(2) The keyhole sewing machine according to (1), wherein the adjusting unit is a stopper that determines a stop position of the wire catching member, and the stopper is changeable and adjustable to the wire catching member. The abutment position.

According to a third aspect of the invention, in the keyhole machine of the aspect of the invention, the lower-line capture mechanism includes a capture actuator that performs a capture operation of a line below the line capture member, and the adjustment unit controls the capture. The actuator adjusts the stop position of the wire catching member in a direction orthogonal to the longitudinal direction of the grommets.

(4) The keyhole machine according to (3), comprising: the needle up-and-down mechanism, the moving mechanism, and the feeding mechanism, and the predetermined position of the buttonhole or the buttonhole is formed. a control device for performing a keyhole slit, wherein the adjustment unit controls the capturing actuator such that a stop position of the wire catching member and a final needle of the keyhole slit formed at a predetermined position with respect to the buttonhole or the buttonhole are The needle position is in the same direction. Effect of the invention

According to the present invention, since the adjustment portion for stopping the position at the time of capturing the line catching member of the lower thread is adjusted in the direction orthogonal to the longitudinal direction of the grommets, even in the direction orthogonal to the longitudinal direction with respect to the grommets In the case where any of the needles of the final needle of the keyhole seam is placed on the needle, the lower thread can still be caught in the same direction, and the inclination of the line covered by the object to be caught to the bottom of the capture position can be lowered to be close to the vertical. It becomes possible to shorten the stump after the off-line is cut.

[Outline of Keyhole Machine] Hereinafter, the keyhole machine 100 of the present invention will be described with reference to the drawings. 1 is a perspective view of the buttonhole machine 100, and FIG. 2 is a schematic view of the internal structure thereof. In the following description, the horizontal direction and the feeding direction of the buttonhole machine 100 are set to the Y-axis direction, and the direction orthogonal to the Y-axis direction is set to the X-axis direction, and the direction is vertical. The up and down direction is set to the Z axis direction. Further, as shown in FIG. 1, one of the Y-axis directions is set to "front", and the other is set to "back"; one of the X-axis directions is set to "right", and the other is set to "left".

The buttonhole machine 100 includes a feed mechanism 70 and a feed plate 71 as a placing portion on which the object to be sewn is placed, and the feed plate 71 is oriented in a constant feed direction (hereinafter referred to as "feeding direction (Y-axis direction)") is a feeding mechanism that moves to feed the workpiece; the needle moves up and down 20 to move the needle 1 up and down; and the needle mechanism 270 causes the needle to be orthogonal to a moving mechanism for moving the direction of the feed direction (X-axis direction); the presser foot 41 as a pressing member for holding the object to be sewn on the feed plate 71; the presser foot lift mechanism 40, by pressing the foot 41, the object to be sewn is held on the feed plate 71; the cutter mechanism 60 forms a buttonhole for the keyhole seam on the object to be sewn; the thread tension device 11 applies tension to the upper thread; and the bobbin case mechanism wraps the lower thread The upper thread cutting device (not shown) performs cutting of the upper thread; the lower thread cutting mechanism 50 performs cutting of the lower thread; the lower thread capturing mechanism 80 captures the lower thread; and the control device 90 performs the operation control of each of the above components; The sewing machine frame 101 accommodates and holds each of the above configurations. Further, by the cooperation of the feed mechanism 70 (feed mechanism), the needle up-and-down mechanism 20, and the needle-needle mechanism 270, the sewn object placed on the feed plate 71 (mounting portion) is sewn. . In addition, since the thread tension device 11 and the upper thread cutting device of the keyhole sewing machine 100 are the same as those of the conventionally known one, the detailed description is omitted. Moreover, the keyhole sewing machine 100 is a sewing machine in which a workpiece to be sewn having a hole for performing a keyhole sewing is formed. Further, the hole is not limited to the grommets, and all the holes requiring the keyhole sewing may be targeted, but here, the grommets along the Y-axis direction are exemplified.

[Sewing Machine Rack] The sewing machine frame 101 is composed of a machine tool portion 102 that constitutes a lower portion of the keyhole machine 100 and extends in the Y-axis direction, a straight solid portion 103 that is erected from the rear end portion of the machine tool portion 102, and a straight solid body. The upper end portion of the portion 103 is formed by an arm portion 104 that extends forward in the Y-axis direction. The machine tool portion 102 is formed in a nearly rectangular parallelepiped shape, and the upper surface portion of the rectangle has a long side along the Y-axis direction. Further, the upper surface of the machine tool unit 102 becomes a work area on which the object to be sewn is placed when sewing. The straight solid portion 103 is disposed on the upper end side of the upper surface of the machine tool portion 102 toward the left side. Thereby, it is possible to cover the entire right half of the upper surface of the upper surface of the machine tool portion 102 in the Y-axis direction as the work area on which the workpiece to be sewn is placed. The arm portion 104 extends forward from the upper end portion of the straight portion 103 to the vicinity of the front end portion of the machine tool portion 102. In the following description, the end surface of the front end portion of the arm portion 104 is referred to as a face portion 105.

[Needle Up/Down Mechanism] The needle up-and-down mechanism 20 has a function of giving up and down movement of the needle bar 21 holding the needle 1. Further, the needle bar 21 is moved up and down while being swayed in the X-axis direction by the oscillating mechanism 270 provided in the needle vertical movement mechanism 20, and the needle 1 swings. As shown in Fig. 2, the needle up-and-down mechanism 20 includes a needle bar 21 that holds the needle 1 at the end, a sewing machine motor 22 that serves as a servo motor that drives the needle 21 up and down, and is directly coupled to the sewing machine motor. The upper shaft 23 of the output shaft of 22, the counterweight 24 fixedly attached to the front end of the upper shaft 23, and the crank rod 25 that connects the upper end portion to the eccentric position of the center of rotation of the counterweight 24 are provided.

The upper shaft 23 is rotatably supported inside the arm portion 104 in a state along the Y-axis direction. Further, the sewing machine motor 22 has its output shaft coupled to the upper shaft 23. The crank 25 is coupled to the lower end portion thereof so as to be rotatable about the Y-axis with respect to the needle bar 21 via the needle bar coupling bolt 31. Therefore, when the counterweight 24 is rotated by the upper shaft 23 by the driving of the sewing machine motor 22, although the upper end portion of the crank 25 coupled to the eccentric position thereof is circumferentially moved, only the needle bar 21 is provided at the lower end portion thereof. The reciprocating motion in the up and down direction is conveyed.

[Wheeling Mechanism] The needle-swing mechanism 270 includes a rocking table 26 that supports the needle bar 21 so as to be reciprocable along the longitudinal direction thereof, and a needle motor 27 that serves as a driving source of the needle (see FIG. 10). The rocking shaft 28 that reciprocates by the needle motor 27 and the rocking arm 29 that is fixedly attached to the front end of the rocking shaft 28 and imparts a rocking motion to the rocking table 26 are provided.

The rocking table 26 is disposed in the vicinity of the arm portion 104 and in the vicinity of the face portion 105, and the upper end portion thereof is supported to be rockable by the stepped screw 30 in the Y-axis direction. The rocking table 26 is supported by the two metal bearings (not shown) in which the needle bar 21 is inserted, and the needle bar 21 is supported to slide up and down with the needle 1 side facing downward.

The rocking shaft 28 is rotatably supported in the arm portion 104 in a state along the Y-axis direction. The rocking shaft 28 is input and rotated by the needle motor 27 from the rear end side thereof. Further, the swing arm 29 is pivotally supported by the front end portion side of the swing shaft 28 in a state where the swing end portion thereof faces downward, and the square die 32 is attached to the swing end portion so as to be rotatable about the Y axis. The square die 32 is a recess that is fitted to the rocking table 26. The concave portion of the rocking table 26 is provided with an opposing surface that slides in contact with both of the X-axis directions of the square die 32, and allows the positional displacement of the square die 32 in the Z-axis direction. Therefore, when the swing arm 29 is rocked in the X-axis direction in a downward direction, the vertical displacement of the square die 32 is allowed with respect to the rocking table 26, and the X-axis direction is shaken. Thereby, the needle bar 21 can be shaken only by a predetermined amount by the needle drop timing of the needle bar 21 by the sewing machine motor 22, so that the needle can be placed at any position in the X-axis direction.

[Bobshell Mechanism] The bobbin case mechanism includes a lower shaft 33 that is rotatably supported in the machine tool unit 102 in a state along the Y-axis direction, and a vertical bobbin case 34 that is rotated by the lower shaft 33, and is used for The drive sprocket 35 attached to the upper shaft 23 and the driven sprocket (not shown) attached to the lower shaft 33 and the sprocket 35 and the driven sprocket are disposed between the drive sprocket 35 and the driven sprocket A toothed timing belt 36. The number of teeth of the drive sprocket 35 and the driven sprocket is set to be rotated by the upper shaft 23 to the lower shaft 33 at a double speed, and is formed so that the vertical bobbin case 34 of the vertical movement of the needle 1 is rotated twice. The vertical bobbin case 34 is provided with a bobbin case that is fixedly attached to the lower shaft 33 and has a tip end, and an inner bobbin case that holds the shuttle box and does not rotate. As the vertical bobbin case 34, a so-called DP bobbin case in which a perfect stitch can be maintained with respect to any of the front and rear feeds is used.

[Cutter Mechanism] The cutter mechanism 60 includes a cloth cutting blade 61 that forms a hole (buttonhole) for performing a keyhole slit in a slit along the Y-axis direction, and a base member 62 that holds the cloth cutting blade 61, and the following A cutter support lever (not shown) that supports the base member 62 and is supported by the arm portion 104 so as to be movable up and down, and a spiral that serves as a drive source for the lift operation of the cloth cutter 61 through the cutter support lever A solenoid 63 (see Fig. 10). The cloth cutting blades 61 are arranged side by side behind the needle 1 and supported by the base member 62 such that the blade faces become parallel to the Y-Z plane. Therefore, by lowering the cloth cutting blade 61, a buttonhole in the Y-axis direction can be formed on the object to be sewn. The base member 62 is formed as a detachable cloth cutting blade 61, and is formed into a cloth cutting blade 61 having a different tooth width to form a buttonhole having a different size. The cutter support lever is biased upward by the extension spring at a time, and the solenoid 63 is formed to resist the tension spring to lower the cloth cutter 61 at the time of cutting.

[Feeding Mechanism] The feeding mechanism (feeding mechanism) 70 includes a rectangular feeding plate 71 disposed on the upper surface of the machine tool unit 102, and two guide shafts 72 in the machine unit 102. 72 is supported as a feed holder 73 slidable in the Y-axis direction, a feed motor 74 for driving the feed source in the Y-axis direction, and a tension between the two pulleys 75, 75 The belt 76 is indeed moved. The guide shafts 72 and 72 are fixedly supported by the machine tool unit 102 in a state parallel to the Y-axis direction.

The feed plate (mounting portion) 71 is disposed on the upper surface of the machine tool portion 102 so that its long side is parallel to the Y-axis direction, and is formed in the vertical direction in the vicinity of the tip end portion in the vicinity of the tip end portion in the vertical direction. A long hole 711 along the Y-axis direction. The long hole 711 is formed to have a width wider than the width of the needle, and a needle plate 82 (not shown in FIG. 1) is disposed on the lower side of the feed plate 71, and the needle plate 82 is formed to be cut. The slit-shaped opening portion along the Y-axis direction and the pinhole along the X-axis direction of the allowable needle are cut by the knife.

The feed base 73 is slidably supported by the guide shafts 72, 72 through a sliding bearing (not shown), and holds the feed plate 71 at the upper portion thereof. One of the two pulleys 75, 75 is mounted on the output shaft of the feed motor 74, and the other is rotatably supported on the inner wall of the machine tool portion 102. Further, the pulleys 75 and 75 are rotatable about the X-axis and are disposed such that the fixed belt 76 that is placed between them is in the Y-axis direction. Further, when the positive belt 76 is coupled to the lower portion of the feed base 73 and the feed motor 74 is rotationally driven, it is formed such that the feed belt 73 and the feed plate 71 are passed through the actuating belt 76. Move in the Y-axis direction.

Therefore, the object to be sewn held by the presser foot 41 on the upper surface of the feed plate 71 can be arbitrarily moved in the Y-axis direction by the operation control of the feed motor 74. Further, as described above, since the needle 1 can be needle-dropped at an arbitrary position in the X-axis direction by the needle up-and-down mechanism 20, it becomes possible to cooperate with the feed mechanism 70 by the needle up-and-down mechanism 20 and the feed mechanism 70. To drop the needle at any position in the XY plane of the object to be sewn.

[Pressing lever lifting mechanism] The presser foot lifting mechanism 40 is provided with a presser foot 41 (pressing member) that presses the object to be sewn on the upper surface of the feed plate 71, and a pressing arm 43 that supports the presser foot 41. The sliding roller 44 that presses the pressing body of the pressing arm 43 and the pressing motor 49 that moves the pressing foot 41 against the sliding roller 44 are pressed downward. The pressing arm 43 is elongated along the Y-axis direction, and the rear end portion thereof is supported on the upper surface of the feeding plate 71 so as to be rotatable about the X-axis. Thereby, the presser foot 41 supported by the front end part of the press arm 43 can be moved up and down. The presser foot 41 is a rectangular flat plate along the X-Y plane, and an opening is formed in the central portion in a range in which the keyhole stitch can be formed. Since the slide roller 44 rotates along the upper surface of the pressing arm 43 along the Y-axis direction, even when the pressing arm 43 moves in the Y-axis direction, the movement can be prevented without hindering the movement. Give the pressure to the bottom.

[Downline Capture Mechanism] FIG. 3 is a bottom view of the lower thread cutting mechanism 50 and the lower thread capture mechanism 80. As shown in the figure, the lower thread catching mechanism 80 is mainly provided with a needle plate table 81 fixed to the lower surface of the feed plate 71 and a needle plate 82 attached to the upper surface of the needle plate table 81, and a needle plate 82. The wire pulling member 83 and the wire pulling beam 84 on the bottom surface side of the table 81, the wire catching member 85 and the wire catching beam 86 provided on the bottom surface side of the needle plate table 81, and the wire drawing beam 84 are given a line catching action. The power transmission link 87 and the actuator 56 including a motor, a solenoid or a pneumatic cylinder that moves the transmission link 87 forward and backward.

The needle plate stage 81 is a substantially rectangular flat plate along the X-Y plane, and an opening portion 811 is formed at the center portion. Further, the needle plate 82 is attached to the opening portion 811 of the needle plate stage 81 in a suspended state. The needle plate 82 is a long flat plate along the Y-axis direction, and is provided with a slit-like insertion hole that can be inserted into the cloth cutting blade 61 along the Y-axis direction and a narrow angle along the X-axis direction of the allowable needle. The slit-like pinholes are formed adjacent to each other. That is, the needle plate 82 is disposed at the needle drop position of the needle plate stage 81 and the lowering position of the cloth cutting blade 61.

The opening portion 811 of the needle plate stage 81 is formed in a range in which the falling needle and the cloth cutting blade 61 can be allowed to fall, and the cutters 51 and 52 which are disposed above and below the wire cutting mechanism 50 are disposed inside, and The wide terrain makes it possible to allow the cutting operation by the upper and lower cutters 51 and 52.

The wire pulling beam 84 is a plate-shaped bell crank along the XY plane, and is rotatably attached to the rear side of the opening 811 of the bottom surface of the needle plate table 81 about the Z axis by a step screw. . Further, the base end portion of the wire drawing member 83 is fixedly attached to the rotating beam portion of one of the ones extending substantially forward from the stepped screw serving as the rotating shaft. Further, one end portion of the transmission link 87 is coupled to be rotatable about the Z-axis in the rotating beam portion on the other side extending substantially rearward from the stepped screw serving as the rotating shaft. Further, when the lower line capturing operation is performed, the tension from the transmission link 87 to the left is input, and the line pulling beam 84 performs the clockwise rotation in FIG.

Further, the wire pulling beam 84 is formed with a protruding portion 841 that protrudes forward in the vicinity of the rotational center position. The protruding portion 841 is disposed so as to be in contact with the convex portion 861 formed on the outer edge portion of the wire capturing beam 86, which will be described later, and acts to capture the cross member 86 with respect to the wire pulling beam 84 when the lower wire is captured. Perform the reverse rotation of the reverse rotation.

The wire pulling member 83 has a long plate shape along the X-Y plane, and the base end portion thereof is fixedly coupled to the rotating end portion of the wire drawing beam 84, and the front end portion extends substantially forward. Further, the wire pulling member 83 performs a turning operation integrally with the wire pulling beam 84 when the lower wire catching operation is performed. The wire pulling member 83 stands by to the left of the pinhole before the start of the capturing operation of the lower thread, and turns to the right when the capturing operation of the lower thread starts. Thereby, the lower edge of the wire pulling member 83 can be abutted against the lower thread, and the lower thread can be brought closer to the right side of the wire capturing member 85.

The wire catching beam 86 is a plate-shaped arm crank along the X-Y plane, and is attached to the right side of the opening 811 of the bottom surface of the needle plate stage 81 so as to be rotatable about the Z axis by a step screw. Further, the base end portion of the wire catching member 85 is fixedly attached by a screw to the rotating beam portion of one of the ones extending substantially forward from the stepped screw serving as the rotating shaft. Further, a tension spring 88 that applies a rotation in the counterclockwise direction in FIG. 3 to the wire catching beam 86 is coupled to the rotating beam portion on the other side of the stepped screw that is the rotating shaft. Further, the end portion on the opposite side of the tension spring 88 is screwed to the needle plate stage 81. Further, the wire catching beam 86 has a convex portion 861 extending to the left of the stepped screw which is the rotational axis thereof, and the outer edge portion on the rear side of the convex portion 861 abuts against the protruding portion 841 of the aforementioned wire pulling beam 84. . The function of the convex portion 861 will be described later.

The wire catching member 85 has a flat plate shape along the X-Y plane, and the base end portion linearly extends rearward, and is bent 90 degrees to the left in the intermediate portion, and the tip end portion is formed in a substantially rectangular shape. The front end portion of the wire catching member 85 is formed with a V-shaped notch 851 that opens to the left side at the left edge portion. When the lower thread is caught, the wire pulling member 83 is rotated in the clockwise direction, and the wire catching member 85 is rotated in the counterclockwise direction, and the lower wire is brought close to the deepest portion (the rightmost side) of the notch 851 to be formed as an in-line pulling member. The right edge portion of 83 captures the lower line when passing through the deepest portion of the notch 851.

Further, as shown in FIG. 4, the wire catching member 85 is located on the upper side of the wire pulling member 83, and the lower surface of the wire catching member 85 is in sliding contact with the upper surface of the wire pulling member 83. Therefore, when the lower thread is caught, it is formed in a state of being pulled between the wire pulling member 83 and the wire catching member 85. As a result, the tensioned object acts downward with respect to the lower thread, and the object to be sewn is slightly pulled downward. Since the wire cutting mechanism 50 is cut off the lower thread in this state as will be described later, the stump of the line below the object to be sewn can be shortened.

Here, the function of the convex portion 861 of the aforementioned wire capturing beam 86 will be described. As described above, the wire catching beam 86 is biased in the counterclockwise direction by the tension spring 88, whereby the wire catching member 85 is in a state of being given a rotational force in the action direction when the line is caught. On the other hand, the wire pulling beam 84 is rotated in the counterclockwise direction by the transmission link 87 before the start of the line capturing operation, so that the wire pulling member 83 becomes the standby position (the position is further to the left than the pinhole). ). At this time, the protrusion 841 of the wire pulling beam 84 presses the convex portion 861 of the wire capturing beam 86 to resist the tension spring 88 and press the wire capturing beam 86 back in the clockwise direction to maintain the wire capturing member 85. It becomes a standby position (it becomes a position to the right of a pinhole). Further, at the time of line capture, since the linear pulling beam 84 is input with a rotational force in the clockwise direction by the transmission link 87, the wire catching beam 86 is rotated counterclockwise in accordance with the tension of the tension spring 88. Therefore, the wire pulling member 83 is rotated to the right, and the wire catching member 85 is interlocked to rotate to the left. That is, the convex portion 861 of the wire capturing beam 86 is in cooperation with the protruding portion 841 of the wire pulling beam 84, so that the wire pulling member 83 and the wire capturing member 85 are in a state of being in their respective standby positions, Move in the direction of close to each other and turn. Thereby, as described above, the deepest portion of the notch 851 of the wire capturing member 85 can be guided and held down.

Further, the lower thread catching mechanism 80 is provided with a stopper 89 which is an adjusting portion that adjusts the stop position at the time of capturing the line catching member 85 that captures the lower line as the X-axis direction. By adjusting the stop position at the time of capturing the line catching member 85 with respect to the X-axis direction, it is possible to adjust the tilt angle of the lower line at the time of cutting.

As shown in FIGS. 3 and 5, the stopper 89 is formed by an eccentric screw that abuts against the outer edge of the base end portion of the wire catching member 85 at the outer periphery of the head portion 891. That is, the stopper 89 is provided with the screw shaft 892 at a position eccentric from the center of the head 891 which is screwed into the screw hole formed in the bottom surface of the needle plate stage 81. Thereby, the eccentric amount of the head portion 891 in the X-axis direction can be changed by rotating the operation stopper 89, and the wire catching member 85 can be adjusted as shown in FIGS. 6(A) and 6(B). The line captures the stop position of the action. Further, reference numeral 893 is a nut that is a lock preventing member 89 that performs the rotation adjustment.

As shown in FIG. 7, when the amount of eccentricity of the head portion 891 is equal to either of the right and left sides (set to the neutral position) with respect to the X-axis direction, the deepest portion of the notch 851 of the wire catching member 85 can be made. The stop position at the time of the capture coincides with the immediately below position of the front end of the needle 1 in a state in which it is not swung to the left or right (set to the neutral position). Further, as shown in FIG. 8, when the eccentric amount of the head portion 891 is maximum on the left side in the X-axis direction, the stop position at the time of capturing the deepest portion of the notch 851 of the wire catching member 85 can be made to the left side. The position immediately below the front end of the needle 1 in the state of maximum swing is the same. Further, as shown in FIG. 9, when the eccentric amount of the head 891 is maximum on the right side in the X-axis direction, the stop position of the deepest portion of the notch 851 of the wire catching member 85 can be stopped. The position immediately below the front end of the needle 1 in the state of the maximum swing to the right side coincides.

[Down-line cutting mechanism] As shown in FIG. 3, the lower wire cutting mechanism 50 is provided with an upper cutter that is connected to the base end portion on the bottom surface of the needle plate table 81 and that is rotatable about the Z-axis on the left front side of the opening portion 811. 51. The lower cutter 52 rotatably coupled to the lower surface of the other end portion of the upper cutter 51 about the Z-axis is rotatably coupled to the lower surface of the lower cutter 52 about the Z-axis so as to be coaxial with the lower cutter 52. The leaf spring 53 and the interlocking link 54 that connects the upper cutter 51 and the wire pulling beam 84 of the lower thread catching mechanism 80 to rotate together are rotated. Further, the lower cutting mechanism 50 upper cutter 51, lower cutter 52, and leaf spring 53 are arranged on the lower side of the needle plate 82 and the upper thread catching member 80 and the upper side of the wire catching member 85. .

The upper cutter 51 has a plate shape along the X-Y plane, and as described above, the base end portion is rotatably supported by the needle plate stage 81 about the Z-axis, and a cutting edge for cutting the lower thread is formed at the rotational end portion. The blade of the upper cutter 51 is formed on the side of the front side of the rotating end portion so as to be substantially along the X-axis direction. Further, it is arranged to be in a standby position where the blade is left rearward with respect to the pinhole before the cutting operation, and the upper blade 51 is rotated counterclockwise in FIG. 3 at the time of cutting, so that the blade is extremely close to the needle. The left side of the hole. Further, the turning operation of the upper cutter 51 at the time of cutting is input from the wire pulling beam 84 through the interlocking link 54.

The lower cutter 52 has a plate shape along the X-Y plane, and a cutting edge for cutting the lower thread is formed by the cooperation with the upper cutter 51 at the rotational end portion extending leftward from the center of rotation thereof. The blade of the lower cutter is formed at an edge portion on the rear side of the rotation end portion so as to be substantially along the X-axis direction. Further, before the cutting operation, the blade of the lower blade 52 is placed at the opposite standby position on the front side of the blade of the upper blade 51, and at the time of cutting, the blade is moved rearward with the rotation of the upper blade 51. Rotate, and after reaching the pinhole, close the mutual blades to cut. In the lower blade 52, a projection 521 that protrudes forward is formed at the edge portion on the front side, and the projection 521 abuts against the inner edge of the opening portion 811 of the needle plate table 81 by the counterclockwise rotation of the upper cutter 51. The portion rotates the blade in the closing direction with respect to the upper cutter 51.

The leaf spring 53 has a plate shape along the X-Y plane, and the shape of the extending end portion extending leftward from the center of rotation thereof from the lower side substantially coincides with the rotational end portion of the upper cutter 51. Further, at the time of cutting off the lower thread, the rotational end portion of the lower cutter 52 enters between the rotational end portion of the upper cutter 51 and the extended end portion of the leaf spring 53. Thereby, the lower thread is cut between the upper cutter 51 and the lower cutter 52, and the cut end portion of the lower thread extending from the vertical bobbin case 34 is sandwiched between the lower cutter 52 and the leaf spring 53. Further, reference numeral 55 denotes an actuating lever for rotating the lower cutter 52 in the direction in which the blade is opened and releasing the lower thread before the start of sewing.

[Control System of Keyhole Machine] FIG. 10 is a block diagram showing a control system of the keyhole machine 100. The keyhole machine 100 is provided with a control device 90 as an operation control device for controlling the operations of the above-described respective configurations. Further, the control device 90 includes a ROM 92 that stores various control programs, a CPU 91 that executes a control program, a RAM 93 that serves as a work area of the CPU 91, and sewing pattern data for the memory keyhole sewing and various setting materials required for the operation control of the sewing machine. The EEPROM 96 can rewrite the memory contents. Further, the CPU 91 is connected to a sewing machine motor driver 22a connected to the sewing machine motor 22 and the encoder 221 for detecting the rotation angle thereof, a needle motor driver 27a for driving the needle motor 27, and a drive through an interface (not shown). The feed motor driver 74a of the feed motor 74, the push motor driver 49a connected to the press motor 49 and the encoder 46 for detecting the rotation angle thereof, and the actuator 56a of the actuator 56 for performing the offline capture operation and the offline disconnection operation The solenoid driver 63a of the solenoid 63 that lifts and lowers the cloth cutting blade 61 and the wire tension solenoid driver 111a that drives the wire tension solenoid 111 as the wire tension driving source of the wire tension device 11 are driven. Further, the CPU 91 is connected to an operation panel 94 for inputting various settings of sewing, such as selection of sewing pattern data for the keyhole slit, and a start switch 95 for inputting the start of sewing.

[Sewing operation of the buttonhole machine] The sewing operation of the buttonhole machine 100 will be described. The sewing pattern data recorded in the EEPROM 96 of the keyhole sewing machine 100 is recorded with information indicating the needle drop position of each needle of the keyhole slit formed around the grommets. When the CPU 91 of the control device 90 reads out the selected predetermined sewing pattern data from the EEPROM 96 through the operation panel 94, it calculates for all the needles from the first needle to the final needle for the respective needle placement positions. The amount of movement of the needle motor 27 and the feed motor 74 of the needle.

Moreover, when the start switch 95 is pressed, the CPU 91 starts the driving of the sewing machine motor 22 and starts sewing. Further, after the driving of the sewing machine motor 22 is started, the shaft angle is read by the encoder 221, and when the predetermined shaft angle is reached, the operation is performed based on the calculated amounts of movement of the needle motor 27 and the feed motor 74. And the needle 1 is positioned at a target position in the X-axis direction, and the object to be sewn is positioned at a target position in the Y-axis direction to perform needle movement for each needle drop position for the target. Further, the CPU 91 stops the sewing machine motor 22 when the needle for all the needle drop positions determined at the sewing pattern data is finished.

Furthermore, the formation of the grommets by the cutter mechanism 60 can be set in advance whether or not it is performed before and after the keyhole sewing. When it is set before the keyhole sewing, the buttonholes formed by the cutter mechanism 60 are formed before the driving of the sewing machine motor 22 is started, and thereafter, the keyhole stitches are formed around the buttonholes. Further, when the sewing of the sewing machine is started, the driving of the sewing machine motor 22 is started, and the keyhole stitches are formed around the predetermined position of the grommets, and then the grommets executed by the cutter mechanism 60 are formed.

Further, the CPU 91 cuts off the upper line and the lower line. Before the start of the cutting operation of the lower thread, the wire pulling member 83 of the lower thread catching mechanism 80 is located at the standby position to the left of the pinhole, and the wire catching member 85 is located at the standby position to the right of the pinhole. Moreover, starting from these states, the actuator 56 is actuated and the wire pulling beam 84 is rotated in the clockwise direction in Fig. 3 to rotate the wire pulling member 83 toward the pinhole. Further, the wire catching beam 86 is rotated in the counterclockwise direction in FIG. 3 in conjunction with the wire pulling beam 84, and the wire catching member 85 is rotated toward the pinhole. Thereafter, although the wire catching member 85 abuts against the stopper 89 and stops rotating at a predetermined position, the wire pulling member 83 continues to rotate until it passes under the pinhole. Thereby, the lower line can be caught at the deepest portion of the notch 851 of the wire catching member 85 that is stopped first.

Further, with the clockwise rotation of the wire pulling beam 84, the upper blade cutting mechanism 50 rotates the cutting blade 51 from the standby position in the counterclockwise direction in FIG. 3 toward the pinhole. Further, when the lower thread catching mechanism 80 catches the lower thread, the lower cutting mechanism 50 closes the cutting edge of the upper cutting blade 51 and the lower cutting blade 52, and cuts between the workpiece and the lower thread catching mechanism 80. Stretched down the line. Then, the CPU 91 raises the presser foot 41 by pressing the motor 49 and releases the sewn object to end the sewing.

Here, in the sewing pattern data, there is a needle drop position L of the final needle, as shown in FIG. 7(A), which is set on the extension line of the buttonhole B, as shown in FIG. 8(A), relative to the buttonhole B. The extension line is set to the left side, and as shown in FIG. 9(A), the extension line is set to the right side with respect to the buttonhole B.

When the needle drop position L of the final needle is set on the extension line of the buttonhole B, the stopper 89 is rotationally adjusted in advance so that the amount of eccentricity of the head portion 891 of the stopper 89 becomes equal to the left and right. Thereby, as shown in FIG. 7(B), the lower line captured by the lower thread catching mechanism 80 becomes a state from the object to be sewn until the line catching member 85 is almost along the Z-axis direction, and can be used in this state. The wire cutting mechanism 50 performs cutting to further shorten the stump of the line below the object to be sewn.

Further, when the needle drop position L of the final needle is set to the left side of the extension line of the buttonhole B, the stopper 89 is rotationally adjusted in advance to a position where the eccentric amount of the head 891 of the stopper 89 is increased to the left side. . Thereby, as shown in FIG. 8(B), the lower line captured by the lower thread catching mechanism 80 becomes a state from the object to be wounded up to the line catching member 85 almost in the Z-axis direction, and can be made lower by this state. The wire cutting mechanism 50 performs cutting to further shorten the stump of the line below the object to be sewn. Further, it is more preferable to adjust the eccentricity of the stopper 89 so that the needle drop position L of the final needle coincides with the position of the deepest portion of the notch 851 of the wire catching member 85 in the X-axis direction at the time of line catching.

Further, when the needle drop position L of the final needle is set to the right side of the extension line of the buttonhole B, the stopper 89 is rotationally adjusted in advance to a position where the eccentric amount of the head portion 891 of the stopper 89 is increased to the right side. . Thereby, as shown in FIG. 9(B), the lower line captured by the lower thread catching mechanism 80 becomes a state from the object to be wounded up to the line catching member 85 almost in the Z-axis direction, and can be made lower by this state. The wire cutting mechanism 50 performs cutting to further shorten the stump of the line below the object to be sewn. In this case, it is preferable to adjust the eccentricity of the stopper 89 so that the needle drop position L of the final needle coincides with the position of the deepest portion of the notch 851 of the wire catching member 85 in the X-axis direction at the time of line catching.

[Technical Effects of the Embodiment of the Invention] The above-described buttonhole capture mechanism 80 of the buttonhole machine 100 has a stop for capturing the line below the line catching member 85 in the direction orthogonal to the longitudinal direction of the buttonhole (X-axis direction). Since the stopper 89 is positioned, even if the needle of the final needle of the keyhole slit is performed on either side of the X-axis direction with respect to the buttonhole B, the lower thread can be caught in the same direction, and the sewing can be reduced. The object covers the tilt of the line below the capture position to be close to vertical, and becomes more able to shorten the stump after the cut off. In particular, since the stopper 89 is configured to adjust the stop position of the line catching member 85 at the time of capturing the lower thread in the X-axis direction, it is possible to perform the lower line with a simple operation with a simple configuration. Capture position adjustment. Further, by forming the adjustment portion by the stopper 89, it is possible to provide the adjustment portion by the easy modification of the existing buttonhole machine, and it is possible to easily shorten the stump after the lower thread is cut. effect.

[Other Examples of Stopper] Although the eccentric screw is exemplified as the stopper 89 of the above-described adjustment portion, other members that can adjust the stop position of the wire catching member 85 in the X-axis direction may of course be used. For example, as shown in FIG. 11, a circular collar 89A having a through hole formed at an eccentric position may be provided at the same position as the stopper 89 by a screw 891A. At this time, the collar 89A can be rotated by loosening the screw 891A to change the amount of eccentricity on the side of the wire catching member 85, and the screw 891A is tightened again. Thereby, the stop position of the wire catching member 85 in the X-axis direction can be adjusted.

Further, as shown in FIG. 12, an adjustment body 89B 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 is composed of a bottom plate portion 891B that is in close contact with the bottom surface of the needle plate table 81, and a vertical wall portion 892B that stands at a right angle from the right end portion of the bottom plate portion 891B along the YZ plane, and the vertical wall portion 892B is formed. The right side wall surface abuts against the wire catching member 85 to stop it at a predetermined position with respect to the X-axis direction. Further, a long hole 893B along the X-axis direction is formed in the center of the bottom plate portion 891B, and the screw 894B is inserted into the long hole 893B to be fixed to the bottom surface of the needle plate stage 81. At this time, the screw 894B can be loosened to adjust the mounting position of the adjustment body 89B for the X-axis direction, and the screw 894B is tightened again. Thereby, the stop position of the wire catching member 85 in the X-axis direction can be adjusted. Further, the adjustment body 89B can be formed by, for example, bending or sheet metal working of a metal plate.

[Other examples of the lower-line capturing mechanism] In the above-described embodiment, the adjusting portion of the lower-line capturing mechanism 80 exemplifies the stopper 89 that requires the adjustment operation by the manual operation. However, the present invention is not limited thereto, and may be configured to have The configuration of the adjustment portion for adjusting the stop position of the wire catching member 85 by the capturing actuator is used. For example, the lower line catching mechanism 80C shown in FIG. 13 may be provided, and the motor 88C (for example, a stepping motor) that is an actuator and can be controlled by the CPU 91 of the control device 90 may be provided. A rotating arm 881C of an output shaft of the motor 88C, and a link member 882C that connects a rotating end portion of the rotating arm 881C and a rotating beam portion on the right side of the wire capturing beam 86. Further, in the case of the lower thread catching mechanism 80C, the projecting portion 841 of the wire pulling beam 84 and the tension spring 88 coupled to the wire catching beam 86 are removed, and the wire pulling beam 84 and the wire catching beam 86 are removed. The interlocking operation is not performed, and the other configuration is the same as that of the lower line capturing mechanism 80. Thereby, the CPU 91 can function as the adjustment unit, and the deepest portion of the notch 851 of the wire catching member 85 can be arbitrarily positioned in the X-axis direction. Therefore, the stump of the lower wire after the sewing is completed can be further shortened.

It is also possible to set the stop position of the deepest portion of the notch 851 of the wire catching member 85 at the time of capturing the lower thread in the X-axis direction by, for example, inputting a numerical value from the operation panel 94. Further, the CPU 91 of the control device 90 can read the sewing pattern data selected for sewing, calculate the needle drop position in the X-axis direction of the final needle, and determine the notch 851 of the line catching member 85 in accordance with the value. The deepest portion is at the stop position in the X-axis direction, and the motor 88C is controlled to be formed as the calculated stop position when the lower line is captured. In this case, the stop position of the deepest portion of the notch 851 of the wire catching member 85 in the X-axis direction should be made to coincide with the needle drop position in the X-axis direction of the final needle, but it is not completely identical. The left and right direction may be such that the needle drop position and the stop position are close to each other in the same direction. In these cases, since the cutting of the appropriate lower line is automatically performed as long as the sewing pattern is determined, the work load of the operator of the sewing machine can be drastically reduced.

[Others] The feed mechanism 70 is exemplified as the feed mechanism 70 that moves the workpiece in the Y-axis direction. However, the feed mechanism is not limited thereto, and the mechanism for moving the needle 1 in the Y-axis direction is also provided as the feed mechanism. can. Further, instead of the needle mechanism 270, a moving mechanism for moving the object to be sewn along the X-axis direction may be provided.

1‧‧‧ needle
11‧‧‧Wire tension device
20‧‧‧needle up and down mechanism
21‧‧‧ Needle bar
22‧‧‧Sewing machine motor
22a‧‧‧Sewing machine motor driver
23‧‧‧Upper axis
24‧‧‧Balance hammer
25‧‧‧ crank
26‧‧‧ shaking table
27‧‧‧Shaped needle motor
27a‧‧‧Spindle motor driver
28‧‧‧Shake axis
29‧‧‧Shake arm
30‧‧‧ stepped screws
31‧‧‧Needle bar connecting bolt
32‧‧‧ square die
33‧‧‧lower shaft
34‧‧‧Vertical bobbin case
35‧‧‧Active sprocket
36, 76‧‧‧Activity belt
40‧‧‧ Presser foot lifting mechanism
41‧‧‧ Pressing feet
43‧‧‧ Pressing arm
44‧‧‧Sliding wheel
49‧‧‧ Pressing the motor
49a‧‧‧Press motor drive
50‧‧‧Offline cutting mechanism
51‧‧‧Upper knife
52‧‧‧Under cutter
53‧‧‧ plate spring
54‧‧‧ linkage link
56‧‧‧Actuator
56a‧‧‧ drive
60‧‧‧Cutter mechanism
61‧‧‧ cut cloth knife
62‧‧‧Base member
63‧‧‧ Solenoid
63a‧‧‧ Solenoid Driver
70‧‧‧Feeding agency (feeding agency)
71‧‧‧Feed board
711, 893B‧‧‧ long hole
72‧‧‧Guide axis
73‧‧‧Feed seat
74‧‧‧Feed motor
74a‧‧‧Feed motor drive
75‧‧‧ Pulley
80, 80C‧‧‧ offline capture mechanism
81‧‧‧needle table
811‧‧‧ openings
82‧‧‧ needle board
83‧‧‧Line pull members
84‧‧‧Line pull beam
841‧‧‧Protruding
85‧‧‧Line capture component
851‧‧ ‧ gap
86‧‧‧Line capture beam
861‧‧‧ convex
87‧‧‧Transport link
88‧‧‧ stretching spring
88C‧‧‧Motor (Capture Actuator)
881C‧‧‧Rotating arm
882C‧‧‧Connecting components
89‧‧‧stops (adjustment)
89A‧‧‧ collar (adjustment department)
89B‧‧‧Regulatory body (regulatory department)
891‧‧‧ head
891A, 894A‧‧‧ bolts
891B‧‧‧Bottom plate
892‧‧‧ Screw shaft
892B‧‧‧立立部
893‧‧‧ nuts
90‧‧‧Control device
91‧‧‧CPU (Adjustment Department)
92‧‧‧ROM
93‧‧‧RAM
94‧‧‧Operator panel
95‧‧‧Start switch
96‧‧‧EEPROM
100‧‧‧ buttonhole machine
101‧‧‧Sewing machine rack
102‧‧‧Car Parts Department
103‧‧‧ Straight Stereo Department
104‧‧‧arm
105‧‧‧Face
111‧‧‧Line tension solenoid
111a‧‧‧Wire tension solenoid driver
221, 46‧‧‧ encoder
270‧‧‧Needing needle mechanism (moving mechanism)
521‧‧‧ Protrusion
B‧‧‧ buttonhole
L‧‧‧The final needle position

Fig. 1 is a perspective view of a buttonhole machine according to an embodiment of the present invention. Fig. 2 is a schematic view showing the internal structure of the buttonhole machine. 3 is a bottom view of the lower thread catching mechanism and the lower thread cutting mechanism. 4 is a cross-sectional view of the wire catching member and the wire pulling member of the lower wire catching mechanism. Figure 5 is a perspective view of the periphery of the stopper of the lower thread catching mechanism. 6(A) shows a state in which the stop position of the wire catching member is adjusted to the right side by the stopper; and FIG. 6(B) shows a state in which the stop position of the wire catching member is adjusted to the left side by the stopper. Illustrating. Fig. 7(A) is an explanatory view showing the needle drop position of the final needle; Fig. 7(B) is an explanatory view showing the catching position of the line catching member which adjusts the stop position corresponding to the needle drop position of the final needle. Fig. 8(A) is an explanatory view showing the needle drop position of the final needle; Fig. 8(B) is an explanatory view showing the catching position of the line catching member which adjusts the stop position corresponding to the needle drop position of the final needle. Fig. 9(A) is an explanatory view showing the needle drop position of the final needle; Fig. 9(B) is an explanatory view showing the catching position of the line catching member which adjusts the stop position corresponding to the needle drop position of the final needle. Figure 10 is a block diagram showing the control system of the buttonhole machine. Fig. 11(A) is a plan view of a collar of another example of the adjustment portion, and Fig. 11(B) is a front view. Fig. 12 is a partial cross-sectional view showing an adjustment body of another example of the adjustment portion. Fig. 13 is a bottom view of another example of the lower thread catching mechanism.

80‧‧‧Underline capture mechanism

81‧‧‧needle table

83‧‧‧Line pull members

85‧‧‧Line capture component

89‧‧‧stops (adjustment)

851‧‧ ‧ gap

891‧‧‧ head

892‧‧‧ Screw shaft

Claims (4)

A keyhole machine comprising: a needle up and down mechanism to move the needle up and down; and a moving mechanism to relatively move the needle relative to the object to be sewn in a direction orthogonal to a longitudinal direction of the buttonhole; the feeding mechanism The object to be sewn moves relative to the needle in the direction of the longitudinal direction of the buttonhole; the lower thread cutting mechanism is disposed on the lower side of the object to be sewn at the time of sewing, and cuts the lower thread; and the lower thread catching mechanism Provided on the lower side of the lower thread cutting mechanism and capturing the lower thread, the keyhole locking mechanism is characterized in that: the lower thread catching mechanism includes: a wire catching member that captures the lower thread, and a direction orthogonal to a longitudinal direction of the buttonhole An adjustment portion for stopping the stop position of the aforementioned wire catching member when the lower thread is captured is adjusted. The buttonhole sewing machine of claim 1, wherein the adjusting portion is a stopper that determines a stop position of the wire catching member, and the stopper is capable of changing a position at which the wire catching member abuts. The buttonhole sewing machine according to claim 1, wherein the lower thread catching mechanism includes a catching actuator that performs a capturing operation of a line below the wire capturing member; and the adjusting unit controls the capturing actuator to be orthogonal to the aforementioned The direction of the longitudinal direction of the grommets adjusts the stop position of the aforementioned wire catching member. The buttonhole machine of claim 3, comprising: a control device that controls the needle up and down mechanism, the moving mechanism, and the feeding mechanism, and performs keyhole around the gusset or buttonhole forming a predetermined position The adjusting portion controls the capturing actuator such that the stopping position of the wire catching member is in the same direction as the needle drop position of the final needle of the keyhole slit formed at a predetermined position with respect to the buttonhole or the buttonhole. .