TWI746457B - Buttonhole machine - Google Patents

Abstract

The subject of the present invention is to shorten the stub of the offline. The solution is a buttonhole machine, which is equipped with: a needle up and down movement mechanism to move the sewing needle up and down; a needle swing mechanism to move the sewing needle in a direction orthogonal to the long side of the buttonhole; a feed mechanism to make the sewing object face each other The sewing needle moves relatively in the direction along the long side of the buttonhole; the lower thread cutting mechanism is set on the underside of the sewing object during sewing, and the lower thread is cut; and the lower thread catching mechanism is set on the lower thread cutting The lower side of the breaking mechanism captures the lower thread, wherein the lower thread catching mechanism is provided with an adjustment part for adjusting the stop position of the thread catching member when the thread catching member is caught in a direction orthogonal to the longitudinal direction of the buttonhole.

Description

Buttonhole machine

The invention relates to a buttonhole machine.

Background of the invention

The buttonhole machine is equipped with a needle swing mechanism that moves the needle in a direction orthogonal to the long side direction of the buttonhole, a cloth feed mechanism that moves the cloth along the long side direction of the buttonhole, is installed under the needle plate, and is sewing The lower thread cutting mechanism that cuts the lower thread at the end, and the lower thread catching mechanism that is arranged under the lower thread cutting mechanism and catches the lower thread at a fixed position.

In addition, during sewing, the cloth feed mechanism moves the fabric along the buttonhole, and the swing needle mechanism moves the needle around the buttonhole while moving the needle up and down to perform lock stitching in a zigzag pattern. When the needle drop of the final needle is finished, the lower thread catching mechanism will keep the lower thread at a fixed position, and the lower thread cutting mechanism will cut the lower thread.

In addition, the thread catching mechanism described above is such that a thread catching plate with a concave notch and a pulling plate that brings the lower thread closer to the thread catching plate are in sliding contact with each other in the direction of approaching each other, and threading is performed at the deepest part of the concave notch. The retention (see, for example, Patent Document 1).

Prior art literature Patent literature

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

Summary of the invention

However, the above-mentioned conventional buttonhole machine fixes the capturing position of the lower thread performed by the lower thread capturing mechanism on the extension line of the buttonhole.

In contrast, the final needle position of the buttonhole stitch 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 or right relative to the extension line of the buttonhole, the lower thread from the cloth covering to the lower thread catching position performed by the lower thread catching mechanism will be inclined, and the lower thread will be produced on the lower thread The length of the stump on the fabric side of the lower thread after cutting by the cutting mechanism becomes longer.

The present invention aims to provide a buttonhole machine which can shorten the stump of the offline.

(1) The present invention is a buttonhole machine, which is provided with: a needle up and down movement mechanism to move the sewing needle up and down; a movement mechanism to move the aforementioned sewing needle in a direction orthogonal to the long side direction of the buttonhole; and a feed mechanism to make the needle The sewing product moves relative to the sewing needle in the direction along the long side of the buttonhole; the lower thread cutting mechanism is arranged on the lower side of the sewing object during sewing and performs the cutting of the lower thread; and the lower thread catching mechanism , Is arranged on the lower side of the lower thread cutting mechanism and captures the lower thread, characterized in that: the lower thread catching mechanism includes: a thread catching member for catching the lower thread, and adjusting the lower thread for the direction orthogonal to the longitudinal direction of the buttonhole The adjustment part of the stop position of the aforementioned thread catching member at the time.

(2) The present invention is characterized in that, in the buttonholing machine described in (1), the adjustment portion is a stopper that determines the stop position of the thread catching member, and the stopper can be changed and adjusted to the thread catching member The abutment position.

(3) The present invention is characterized in that, in the buttonhole machine described in (1), the lower thread catching mechanism is provided with a catching actuator that performs a catching action of the lower thread of the thread catching member, and the adjusting part controls the catching The actuator adjusts the stop position of the thread catching member in a direction orthogonal to the longitudinal direction of the buttonhole.

(4) The present invention is characterized in that, in the buttonhole machine described in (3), Equipped with a control device that controls the needle up and down mechanism, the movement mechanism, and the feed mechanism, and performs buttonhole stitching around the predetermined position where the buttonhole or buttonhole is formed, and the adjustment unit controls the capture actuator, The stop position of the thread catching member and the final needle drop position of the buttonhole stitch relative to the predetermined position of the buttonhole or buttonhole are aligned in the same direction.

The present invention includes an adjustment section for adjusting the stop position of the thread capturing member that captures the lower thread in the direction orthogonal to the longitudinal direction of the buttonhole. Therefore, even if the buttonhole is in a direction orthogonal to the longitudinal direction, In the case of the final needle drop of the buttonhole stitching on any one of them, it can still approach in the same direction to capture the lower thread, and can reduce the inclination of the thread covered by the sewn to the bottom of the capture position to be close to vertical, and It becomes possible to shorten the stump after the downline is cut.

1: stitch

11: Wire tension device

20: Needle up and down movement mechanism

21: Needle bar

22: Sewing machine motor

22a: Sewing machine motor driver

23: upper shaft

24: Counterweight

25: crank

26: shaking table

27: Pendulum motor

27a: Pendulum motor driver

28: Shake the shaft

29: swing arm

30: Stepped screw

31: Needle bar connecting bolt

32: square die

33: Lower shaft

34: Vertical bobbin case

35: active sprocket

36, 76: check belt

40: Presser foot lever lifting mechanism

41: Cloth foot

43: press arm

44: sliding wheel

49: Press the motor

49a: Press the motor driver

50: offline cutting mechanism

51: Upper Cutter

52: Lower Cutter

53: leaf spring

54: Linkage Link

55: Actuating Lever

56: Actuator

56a: drive

60: Cutter mechanism

61: Cloth cutting knife

62: base member

63: Solenoid

63a: Solenoid driver

70: cloth feeding mechanism (feeding mechanism)

71: Feed plate

711, 893B: Long hole

72: guide shaft

73: Feed seat

74: Feed motor

74a: Feed motor driver

75: Pulley

80, 80C: offline capture agency

81: Needle plate table

811: opening

82: Needle plate

83: Wire pulling component

84: Wire pulling beam

841: protruding part

85: Line snap component

851: gap

86: Line snap beam

861: Convex

87: Communication Link

88: Extension spring

88C: Motor (Actuator for capture)

881C: Rotating arm

882C: connecting member

89: Stopper (adjustment part)

89A: Collar (adjustment part)

89B: Regulator (Regulator)

891: head

891A, 894A: Bolt

891B: bottom plate

892: screw shaft

892B: Standing Wall

893: Nut

90: control device

91: CPU (adjustment part)

92: ROM

93: RAM

94: Operation panel

95: Start switch

96: EEPROM

100: Buttonhole machine

101: Sewing machine frame

102: car platform

103: straight three-dimensional part

104: Arm

105: face

111: Wire tension solenoid

111a: Wire tension solenoid driver

221, 46: encoder

270: Needle pendulum mechanism (moving mechanism)

521: Prominence

B: Buttonhole

L: The final needle drop position

Fig. 1 is a perspective view of a buttonhole sewing machine according to an embodiment of the invention.

Figure 2 is a schematic diagram of the internal structure of the buttonhole machine.

Figure 3 is a bottom view of the lower thread catching mechanism and the lower thread cutting mechanism.

Fig. 4 is a cross-sectional view of the thread catching member and the thread pulling member of the lower thread catching mechanism.

Fig. 5 is a perspective view of the periphery of the stopper of the lower thread catching mechanism.

Figure 6(A) shows the state where the stop position of the thread catching member is adjusted to the right by the stopper; Figure 6(B) shows the state where the stop position of the thread catching member is adjusted to the left by the stopper Illustrating.

Fig. 7(A) is an explanatory diagram showing the needle drop position of the final needle; Fig. 7(B) is an explanatory diagram showing the catch position of the thread catching member that adjusts the stop position corresponding to the needle drop position of the final needle.

Fig. 8(A) is an explanatory diagram showing the needle drop position of the final needle; Fig. 8(B) is an explanatory diagram showing the catch position of the thread catching member that adjusts the stop position corresponding to the needle drop position of the final needle.

Fig. 9(A) is an explanatory diagram showing the needle drop position of the final needle; Fig. 9(B) is an explanatory diagram showing the catch position of the thread catching member that 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 adjusting part, and Fig. 11(B) is a front view.

Fig. 12 is a partial cross-sectional view of a regulating body of another example of the regulating portion.

Fig. 13 is a bottom view of another example of the down-line catching mechanism.

[Summary of buttonhole machine]

Hereinafter, the buttonhole machine 100 of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a buttonhole machine 100, and Fig. 2 is a schematic view of its internal structure. Furthermore, in the following description, the horizontal direction and the feeding direction of the buttonhole machine 100 are set to the Y-axis direction, the horizontal direction and the direction orthogonal to the Y-axis direction is set to the X-axis direction, and the vertical The vertical direction is the Z-axis direction. Also, as needed, as shown in Figure 1, set one of the Y-axis directions to "front" and the other to "back"; set one of the X-axis directions to "right" and the other to "Left".

The buttonhole machine 100 is provided with a cloth feed mechanism 70, a feed plate 71 as a placement part on which the sewn object is placed, and a feed plate 71 by which the feed plate 71 is moved along a certain feed direction (hereinafter referred to as "Feeding direction (Y-axis direction)") moves to feed the sewing material; the needle up and down movement mechanism 20 moves the sewing needle 1 up and down; the needle swing mechanism 270 is used to move the sewing needle along orthogonal to The moving mechanism that moves in the direction of the feed direction (X-axis direction); the presser foot 41 is used as a pressing member that holds the sewn from the upper part of the feed plate 71; the presser foot lever lifting mechanism 40 is used by the presser foot 41 and hold the sewing object on the feed plate 71; the cutter mechanism 60 forms buttonholes for buttonhole sewing on the sewing object; the thread tension device 11 applies tension to the upper thread; the bobbin case mechanism winds the lower thread to Upper thread; upper thread cutting device (not shown), which cuts upper thread; lower thread cutting mechanism 50, performs lower thread cutting; lower thread catching mechanism 80, catches lower thread; control device 90, controls the actions of the above-mentioned parts; and Sewing machine frame 101, to accommodate and hold The above composition. In addition, the cloth feed mechanism 70 (feeding mechanism), the needle up and down movement mechanism 20, and the needle swing mechanism 270 cooperate to perform buttonhole stitching on the article to be sewn placed on the feed plate 71 (placement portion) .

In addition, since the thread tension device 11 and the upper thread cutting device of the buttonhole machine 100 are the same as those known in the past, detailed descriptions are omitted.

In addition, the above-mentioned buttonhole machine 100 is a sewing machine that uses a sewing object formed with a hole for buttonhole sewing as a sewing object. Furthermore, this hole is not limited to buttonholes, and all holes that require buttonhole stitching can be used as objects. However, the buttonhole along the Y-axis direction is taken as an example here.

[Sewing machine frame]

The sewing machine frame 101 is composed of: a machine tool part 102 that constitutes the lower part of the buttonhole machine 100 and extends along the Y-axis direction; It is constituted by an arm 104 extending forward along the Y-axis direction.

The above-mentioned machine tool part 102 is formed into a nearly rectangular parallelepiped shape, and the upper surface of the rectangular shape has the long side along the Y-axis direction. In addition, the upper surface of the machine tool unit 102 becomes a work area where the sewing object is placed during sewing.

The vertical three-dimensional part 103 is arranged near the left side on the rear end side of the upper surface of the machine tool part 102. Thereby, it becomes possible to use almost the right half of the upper surface of the machine tool unit 102 covering the entire length in the Y-axis direction as a work area for placing the sewing object.

The arm 104 extends forward from the upper end of the straight solid part 103 to the vicinity of the front end of the machine tool part 102. In addition, in the following description, the front end surface of the arm 104 is referred to as the face 105.

[Needle up and down mechanism]

The needle up-and-down movement mechanism 20 has the function of giving the up and down movement of the needle bar 21 holding the sewing needle 1. In addition, while the needle bar 21 moves up and down, by combining the needle swing mechanism 270 provided in the needle up and down mechanism 20 to swing in the X-axis direction, the sewing needle 1 swings the needle. As shown in Figure 2, this needle up-and-down movement mechanism 20 is provided with: a needle bar 21 holding the needle 1 at the following end, a sewing machine motor 22 as a servo motor that serves as a driving source for the needle bar 21 to move up and down, The upper shaft 23 directly connected to the output shaft of the sewing machine motor 22, the counterweight 24 fixedly assembled to the front end of the upper shaft 23, and the crank rod that connects the upper end to the eccentric position of the center of rotation of the counterweight 24 25.

The upper shaft 23 is rotatably supported inside the arm 104 in a state along the Y-axis direction. In addition, the sewing machine motor 22 has its output shaft connected to the upper shaft 23.

The crank 25 is connected with the lower end of the needle bar connection bolt 31 so as to be rotatable about the Y axis with respect to the needle bar 21. Therefore, when the counterweight 24 is driven by the sewing machine motor 22 to rotate through the upper shaft 23, although the upper end of the crank 25 connected to its eccentric position moves in a circular motion, the lower end only moves along the needle bar 21. The reciprocating motion in the up and down direction is communicated.

[Swing needle mechanism]

The swinging needle mechanism 270 is provided with a swinging table 26 that supports the needle bar 21 to reciprocate along its longitudinal direction, a swinging needle motor 27 (refer to FIG. 10) as the driving source of the swinging needle, and the swinging needle The swing shaft 28 through which the motor 27 reciprocates, and the swing arm 29 that is fixedly assembled to the front end of the swing shaft 28 and gives the swing table 26 a swing motion.

The swinging table 26 is arranged inside the arm 104 and very close to the face 105, and its upper end is supported to be swingable by a stepped screw 30 along the Y-axis direction. This rocking table 26 is inserted into the two metal bearings (not shown) of the needle bar 21 to support the needle bar 21 so as to be slidable up and down with the needle 1 side facing downward.

The swing shaft 28 is rotatably supported in the arm 104 in a state along the Y-axis direction. The oscillating shaft 28 receives a rotating motion from the rear end side of the oscillating needle motor 27.

In addition, the swing arm 29 is pivotally supported on the front end side of the swing shaft 28 with its swing end facing downward, and a square die 32 is attached to the swing end so as to be rotatable about the Y axis. The square die 32 is fitted into the recess of the rocking table 26. The concave portion of the rocking table 26 has opposing surfaces that slide in contact with the two side surfaces of the square die 32 in the X-axis direction, and allows the position of the square die 32 in the Z-axis direction to shift. Therefore, with the swing arm 29 facing When swinging in the X-axis direction in the lower state, the vertical displacement of the square die 32 is allowed with respect to the swinging table 26 and the X-axis direction is given to the swing.

Thereby, the needle bar 21 can be moved by a predetermined amount in accordance with the needle drop time of the needle bar 21 performed by the sewing machine motor 22, so that the needle can be dropped at any position in the X-axis direction.

[Bobbin case mechanism]

The bobbin case mechanism is provided with a lower shaft 33 rotatably supported in the machine tool unit 102 in a state along the Y-axis direction, a vertical bobbin case 34 that is rotated by the lower shaft 33, and a lower shaft 33 The driving sprocket 35 mounted on the upper shaft 23 for torque transmission, the unshown driven sprocket mounted on the lower shaft 33, and the toothed positive driving belt installed between the driving sprocket 35 and the driven sprocket (timing belt) 36.

The number of teeth of the driving sprocket 35 and the driven sprocket is set to transmit double-speed rotation from the upper shaft 23 to the lower shaft 33, and is formed so that the vertical bobbin case 34 that moves up and down once the needle 1 rotates twice.

The vertical bobbin case 34 is provided with an outer bobbin case that is fixedly assembled to the lower shaft 33 and has a tip, and an inner bobbin case that holds the shuttle box and does not rotate. As this vertical bobbin case 34, what is used is a so-called DP bobbin case that can maintain perfect stitches with respect to either of the front and rear feeding.

[Cutter Mechanism]

The knife mechanism 60 is provided with a cloth cutting knife 61 for forming a hole (buttonhole) for buttonhole stitching with a slit along the Y-axis direction, a base member 62 holding the cloth cutting knife 61, and a lower end holding base The member 62 is supported by the arm 104 as an up-and-down knife support rod (not shown), and a solenoid (solenoid) 63 as a drive source for giving the cloth cutting knife 61 up and down through the knife support rod (Refer to Figure 10).

The cloth cutting knife 61 is arranged side by side behind the sewing needle 1, and is supported by the base member 62 so that its knife surface becomes parallel to the Y-Z plane. Therefore, by lowering the cloth cutting knife 61, a buttonhole in the Y-axis direction can be formed on the sewing object.

The base member 62 is made into a removable cloth cutting knife 61, and can be made into a cloth cutting knife 61 with different tooth widths to form buttonholes of different sizes.

The knife support rod is energized upward at any time by a tension spring not shown, and the solenoid 63 is formed to resist the tension spring to lower the cloth cutting knife 61 during cutting.

[Feeding mechanism]

The cloth feeding mechanism (feeding mechanism) 70 is provided with a rectangular feed plate 71 arranged on the upper surface of the machine tool unit 102, and is supported by two guide shafts 72, 72 in the machine tool unit 102. A feed seat 73 slidable in the Y-axis direction, a feed motor 74 that is a drive source for feeding cloth in the Y-axis direction, and a driving belt 76 stretched between two pulleys 75 and 75.

The above-mentioned guide shafts 72 and 72 are all fixedly supported in the machine tool unit 102 in a state parallel to the Y-axis direction.

The feed plate (placement portion) 71 is arranged on the upper surface of the machine tool unit 102 so that its long side is parallel to the Y-axis direction, and is formed to penetrate in the vertical direction near the front end portion and almost the center portion in the X-axis direction Long hole 711 along the Y-axis direction. The long hole 711 is formed with a width sufficiently wider than the width of the pendulum needle. On the lower side of the feed plate 71, a needle plate 82 (not shown in FIG. 1) is arranged. The aforementioned needle plate 82 is formed to cut cloth The slit-shaped opening along the Y-axis direction cut by the knife, and the pinhole along the X-axis direction that allows the swinging needle.

The feed seat 73 is slidably supported by guide shafts 72 and 72 through a sliding bearing not shown, and holds the feed plate 71 on the upper part thereof.

One of the two pulleys 75 and 75 is installed on the output shaft of the feed motor 74, and the other is rotatably supported on the inner wall of the machine tool section 102. In addition, these pulleys 75 and 75 are both rotatable around the X-axis and are arranged so that the mutually positive driving belt 76 spanned therebetween is in a state along the Y-axis direction.

Furthermore, when this confirmation belt 76 is partially connected to the lower part of the feed base 73 and the feed motor 74 is driven to rotate, it will be formed so that the feed base 73 and the feed plate 71 are moved by the confirmation belt 76. Move in the Y-axis direction.

Therefore, the upper surface of the feed plate 71 is held by the presser foot 41 and is sewn. The object can be moved and positioned arbitrarily in the Y-axis direction by controlling the action of the feed motor 74. Furthermore, as mentioned above, since the needle 1 can be dropped at any position in the X-axis direction by the needle up and down mechanism 20, it becomes possible to cooperate with the needle up and down mechanism 20 and the cloth feed mechanism 70. , To drop the needle at any position in the XY plane of the sewing object.

[Presser foot bar lifting mechanism]

The presser bar lifting mechanism 40 is provided with a presser foot 41 (pressing member) that presses the article to be sewn on the upper surface of the feed plate 71, a presser arm 43 that supports the presser foot 41, and a presser arm 43 that presses down The sliding roller 44 of the pressing body, and the pressing motor 49 that resists the sliding roller 44 to raise and lower the cloth presser foot 41.

The pressing arm 43 is elongated 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. Thereby, the cloth presser foot 41 supported by the front end of the pressing 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 center portion within the range where the buttonhole stitch can be formed.

Since the sliding roller 44 rotates 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, it can be moved without hindering the movement. Give downward pressure.

[Offline capture agency]

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 mainly includes: a needle plate table 81 fixedly mounted on the machine tool unit 102 under the feed plate 71, a needle plate 82 mounted on the upper surface of the needle plate table 81, and a needle plate The thread pulling member 83 and the thread pulling beam 84 on the bottom side of the table 81, the thread catching member 85 and the thread catching beam 86 provided on the bottom side of the needle plate table 81, the thread pulling beam 84 gives the thread catching action to the rotation The power transmission link 87 and the actuator 56 constituted by a motor, a solenoid, or a pneumatic cylinder that move the transmission link 87 up and down.

The needle plate base 81 is a substantially rectangular flat plate along the X-Y plane, and has an opening 811 formed in the center. Moreover, the opening 811 of the needle plate base 81 is mounted in a suspended state. Equipped with needle plate 82. The needle plate 82 is a long flat plate along the Y-axis direction, and the slit-shaped insertion hole along the Y-axis direction of the cloth cutting knife 61 can be inserted, and the slit-shaped insertion hole along the X-axis direction that allows the pendulum needle The slit-shaped pinholes are adjacent to each other and formed penetratingly. That is, the needle plate 82 is arranged at the needle drop position of the needle plate table 81 and the lower position of the cloth cutting knife 61.

The opening 811 of the needle plate table 81 is formed in a range that allows the lowering of the needle drop and the cloth cutting knife 61, and the cutters 51, 52 above and below the lower thread cutting mechanism 50 described later are arranged inside it, and more The wide shape allows the cutting operation performed by these upper and lower cutters 51 and 52 to be allowed.

The wire pulling beam 84 is a plate-shaped bell crank along the XY plane, and is mounted on 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 stepped screw . In addition, the base end portion of the wire pulling member 83 is fixedly fitted with a screw on one of the rotating beams on one side extending substantially forward by a stepped screw serving as a rotating shaft. In addition, one end of the transmission link 87 is connected to the other side of the rotation beam portion extending substantially rearward from the stepped screw serving as the rotation axis so as to be rotatable about the Z axis. In addition, when the thread catching action is performed, the leftward tension from the transmission link 87 will be input, and the thread pulling beam 84 will perform a clockwise rotation action in FIG. 3.

Moreover, this wire pulling beam 84 is formed with a protrusion 841 protruding forward in the vicinity of its rotation center position. This protruding portion 841 is arranged to abut the convex portion 861 formed on the outer edge of the wire catching beam 86 described later, and acts to interact with the wire pulling beam 84 relative to the wire catching beam 86 when the lower thread catching operation is performed. Carry out the reverse revolving interlocking rotation.

The wire pulling member 83 is in the shape of a long plate along the X-Y plane, and its base end is fixedly connected to the rotating end of the wire pulling beam 84, and the front end thereof extends substantially forward. In addition, when the thread pulling member 83 performs a bobbin catching operation, it rotates integrally with the thread pulling beam 84.

This thread pulling member 83 waits on the left side of the pinhole before the start of the catching action of the thread, and rotates to the right when the catching action of the thread starts. Thereby, the right edge of the thread pulling member 83 can abut the lower thread, so that the lower thread is close to the thread catching member 85 on the right side.

The line catching beam 86 is a plate-shaped double-arm crank along the X-Y plane, and borrows It is mounted on the right side of the opening 811 on the bottom surface of the needle plate base 81 by a stepped screw so as to be rotatable around the Z axis. In addition, the base end portion of the wire catching member 85 is fixed and assembled with a screw at one of the rotating beams on one side extending substantially forward by a stepped screw serving as a rotating shaft. In addition, to the other side of the rotating beam portion extending substantially to the right by the stepped screw serving as the rotating shaft, a tension spring 88 that gives the thread catching beam 86 a counterclockwise rotation in FIG. 3 is connected. Furthermore, the opposite end of the tension spring 88 is fixed to the needle plate base 81 by a screw lock.

In addition, the thread catching beam 86 has a convex portion 861 extending to the left of the stepped screw, which is the axis of rotation, and the outer edge portion behind the convex portion 861 abuts the protrusion 841 of the wire pulling beam 84. . The function of the convex portion 861 will be described later.

The thread catching member 85 has a flat plate shape along the X-Y plane, and the base end portion linearly extends backward, and is bent at 90° to the left in the middle portion, and the front end portion is formed into a substantially rectangular shape.

The front end of the thread catching member 85 is formed with a V-shaped notch 851 that opens to the left at the left edge. When catching the lower thread, the thread pulling member 83 rotates clockwise, and the thread catching member 85 rotates counterclockwise so that the lower thread is close to the deepest part (the rightmost) of the notch 851 to form the thread pulling member When the right edge of 83 passes through the deepest part of the gap 851, the lower line is captured.

Furthermore, 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 and the upper surface of the wire pulling member 83 are in sliding contact with each other. Therefore, when the thread is caught, it is in a state of being drawn between the thread pulling member 83 and the thread catching member 85 and clamped. By this, the downward tension with respect to the lower thread acts, and the sewn article is slightly pulled in the downward state. Since the lower thread cutting mechanism 50 described later cuts the lower thread in this state, it is possible to shorten the stump of the lower thread of the object to be sewn.

Here, the function of the aforementioned line catching the convex portion 861 of the beam 86 will be described.

The thread catching beam 86, as described above, is provided with a counterclockwise rotation force by the tension spring 88, so that the thread catching member 85 is in a state of being given a rotation force in the direction of movement at the time of the thread catching.

On the other hand, the thread pulling beam 84, before the start of the thread catching action, a counterclockwise rotation force is input from the transmission link 87, so that the thread pulling member 83 becomes the standby position (it becomes a position further to the left than the needle hole). ). At this time, the wire pulling the protrusion 841 of the beam 84 will press the convex portion 861 of the wire catching beam 86 to resist the tension spring 88 and press the wire catching beam 86 back in the clockwise direction to maintain the wire catching member 85 It becomes the standby position (it becomes a position further to the right than the pinhole).

Furthermore, when the thread is caught, since the wire pulling beam 84 is input with a clockwise rotation force from the transmission link 87, the thread catching beam 86 will rotate counterclockwise with the tension of the tension spring 88. Therefore, the wire pulling member 83 rotates to the right, and the wire catching member 85 rotates to the left in conjunction.

That is, the convex portion 861 of the thread catching beam 86 cooperates with the protruding part 841 of the thread pulling beam 84, so that the thread pulling member 83 and the thread catching member 85 are moved from their respective standby positions to the The directions close to each other are linked and rotated. As a result, as described above, the deepest part of the notch 851 of the thread catching member 85 can be guided and held down.

In addition, the lower thread catching mechanism 80 is provided with a stopper 89 as an adjustment part that adjusts the stop position of the thread catching member 85 for catching the lower thread in the X-axis direction. By adjusting the stop position of the thread catching member 85 at the time of catching with respect to the X-axis direction, the inclination angle of the lower thread at the time of cutting can be adjusted.

The stopper 89 is composed of an eccentric screw whose outer periphery of the head 891 abuts against the left edge of the base end of the thread catching member 85 as shown in FIGS. 3 and 5. That is, the stopper 89 sets the screw shaft 892 at a position eccentric from the center of the head 891, and the screw shaft 892 is screwed into the screw hole formed on the bottom surface of the needle plate base 81. Thereby, the eccentricity of the head 891 in the X-axis direction can be changed by rotating the stopper 89, and as shown in FIGS. 6(A) and 6(B), the wire catching member 85 can be adjusted The stop position when the line captures the action.

In addition, the symbol 893 is a nut used to prevent loosening of the stopper 89 for rotation adjustment.

This stopper 89, as shown in FIG. 7, when the eccentricity of the head 891 is equal to either side of the X-axis direction (set to a neutral position), it can make the line catching member 85 of the deepest part of the notch 851 The stop position during capture and the state of not swinging to either the left or the right (set In the neutral position), the front end of the needle 1 has the same position directly underneath.

In addition, the stopper 89, as shown in FIG. 8, when the eccentricity of the head 891 is maximized on the left side in the X-axis direction, the stop position of the deepest part of the notch 851 of the thread catching member 85 can be set to the left side. The position directly below the front end of the needle 1 in the state of maximum swing is the same.

Furthermore, the stopper 89, as shown in FIG. 9, when the eccentricity of the head 891 is the largest on the right side of the X-axis direction, it can make the stop position of the deepest part of the notch 851 of the thread catching member 85 and the stop position The position just below the front end of the needle 1 in the state of swinging the most to the right is the same.

[Offline cutting mechanism]

The lower thread cutting mechanism 50, as shown in FIG. 3, is provided with: on the bottom surface of the needle plate base 81 and the left front side of the opening 811, an upper cutter 51 connected to the base end rotatably around the Z axis, and capable of rotating around the Z axis A lower cutter 52 rotatably connected to the lower surface of the other end of the upper cutter 51, a leaf spring 53 rotatably connected to the lower surface of the lower cutter 52 so as to be coaxial with the lower cutter 52 around the Z axis, and The upper cutting knife 51 is connected to the thread pulling beam 84 of the lower thread catching mechanism 80 to interlock to rotate the interlocking link 54.

In addition, the upper cutter 51, the lower cutter 52, and the leaf spring 53 of the lower thread cutting mechanism 50 are arranged to be the lower side of the needle plate 82 and the upper side of the thread pulling member 83 and the thread catching member 85 of the lower thread catching mechanism 80 .

The upper cutter 51 has a plate shape along the X-Y plane, and as described above, the base end is rotatably supported on the needle plate table 81 around the Z axis, and a cutting edge for cutting the lower thread is formed at the rotating end. The blade of the upper cutter 51 is formed at the edge portion on the front side of the rotating end portion substantially along the X-axis direction. Furthermore, it is arranged so that before the cutting operation, the blade is at a standby position where the blade becomes rear left with respect to the needle hole. When cutting, the upper cutter 51 is rotated in the counterclockwise direction in FIG. 3, and the blade is extremely close to the needle. The left side of the hole.

In addition, the rotation movement of the upper cutter 51 during cutting is input by the wire pulling the cross beam 84 through the interlocking link 54.

The lower cutter 52 is a plate-like shape along the X-Y plane, and moves from its center of rotation to The rotating end extending to the left forms a blade for cutting the lower thread through cooperation with the upper cutter 51. The blade of the lower cutter is formed at the edge portion behind the rotating end portion substantially along the X-axis direction. In addition, before the cutting operation, the blade of the lower cutter 52 will be in the opposite standby position on the front side of the blade of the upper cutter 51, and during cutting, the blade of the upper cutter 51 will rotate to the rear. Rotate, and after reaching below the pinhole, close the blades of each other to cut off.

The lower knife 52 is formed with a protrusion 521 protruding forward on the edge of the front side, and the protrusion 521 abuts the inner edge of the opening 811 of the needle plate base 81 by turning the upper knife 51 counterclockwise. Part, so as to rotate the blade in the closing direction with respect to the upper cutter 51.

The leaf spring 53 is in the shape of a plate along the X-Y plane, and the shape of the extended end extending from the center of rotation to the left is almost the same as the rotating end of the upper cutter 51 when viewed from below. Moreover, when the lower thread is cut, the rotating end of the lower cutter 52 enters between the rotating end of the upper cutter 51 and the extending end 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 of the lower thread extending from the vertical bobbin case 34 is clamped between the lower cutter 52 and the leaf spring 53.

In addition, the symbol 55 is an actuating lever that rotates the lower knife 52 in a direction to open the blade before sewing starts and releases the lower thread.

[Control system of buttonhole machine]

FIG. 10 is a block diagram showing the control system of the buttonhole machine 100. The buttonhole machine 100 is provided with a control device 90 as an operation control device for controlling the operation of each of the above-mentioned components. In addition, the control device 90 is equipped with: ROM 92 that stores various control programs, CPU 91 that executes the control programs, RAM 93 that becomes the work area of CPU 91, and stores the sewing pattern data of buttonhole stitching and various setting data required for motion control of the sewing machine. EEPROM96 whose memory content can be rewritten.

In addition, a sewing machine motor driver 22a connected to the sewing machine motor 22 and an encoder 221 for detecting its rotation angle, a needle motor driver 27a for driving the needle motor 27, and a driver are connected to the CPU 91 through an interface (not shown) The feed motor driver 74a of the feed motor 74 is connected to the pressing motor 49 and the encoder 46 for detecting its rotation angle Press the motor driver 49a, the driver 56a of the actuator 56 for capturing the lower thread and the cutting operation of the lower thread, the solenoid driver 63a of the solenoid 63 that drives the cloth cutting knife 61 up and down, and the thread tension device The line tension solenoid driver 111a driven by the line tension solenoid 111 of the line tension driving source of 11.

Furthermore, an operation panel 94 for inputting various settings related to sewing, such as selection of sewing pattern data for buttonhole sewing, and a start switch 95 for inputting the start of sewing are connected to the CPU 91.

[Sewing action of buttonhole machine]

The sewing operation of the buttonhole machine 100 described above will be described.

The sewing pattern data recorded in the EEPROM 96 of the buttonhole machine 100 is recorded with data indicating the needle drop position of each stitch of the buttonhole stitch formed around the buttonhole.

When the CPU 91 of the control device 90 reads the selected predetermined sewing pattern data from the EEPROM 96 through the operation panel 94, it will calculate the sequence of the needle drop positions for all the needles from the first needle to the final needle. The amount of movement of the needle swing motor 27 and the feed motor 74 for moving the needle.

Moreover, when the start switch 95 is pressed, the CPU 91 will start the driving of the sewing machine motor 22 and start sewing.

In addition, after the driving of the sewing machine motor 22 is started, the shaft angle is read by the encoder 221, and when it reaches a predetermined shaft angle, it is driven according to the calculated movement of the needle motor 27 and the feed motor 74. In addition, the sewing needle 1 is positioned at the target position in the X-axis direction, and the sewing object is positioned at the target position in the Y-axis direction, so as to move the needle according to each target needle drop position.

Furthermore, when the needle movement for all needle drop positions determined by the sewing pattern data is completed, the CPU 91 stops the sewing machine motor 22.

Furthermore, the buttonhole formation performed by the cutter mechanism 60 can be set in advance whether it is performed at any time before or after the buttonhole sewing.

When it is set before the buttonhole sewing, the buttonhole formation by the cutter mechanism 60 will be performed before the driving of the sewing machine motor 22 starts, and then the buttonhole stitches will be formed around the buttonhole.

Furthermore, after the buttonhole sewing, the sewing machine motor 22 will be driven first to form buttonhole stitches around the predetermined position of the buttonhole formation, and then the buttonhole formation performed by the cutter mechanism 60 will be performed.

Furthermore, the CPU 91 will cut off the on-line and off-line.

Before the cutting operation of the lower thread starts, the thread pulling member 83 of the lower thread catching mechanism 80 will be located at the standby position on the left of the needle hole, and the thread catching member 85 will be located at the standby position on the right of the needle hole. Then, starting from these states, the actuator 56 is actuated, and the wire pulling beam 84 is rotated in the clockwise direction in FIG. 3 so that the wire pulling member 83 is rotated toward the needle hole. In addition, the thread catching beam 86 rotates counterclockwise in FIG. 3 in conjunction with the thread pulling beam 84, and the thread catching member 85 rotates toward the pinhole.

After that, although the thread catching member 85 will abut against the stopper 89 and stop rotating at a predetermined position, the thread pulling member 83 will continue to rotate until it passes under the needle hole. Thereby, the thread can be caught at the deepest part of the notch 851 of the thread catching member 85 that was stopped first.

In addition, along with the clockwise rotation of the thread pulling beam 84, the upper cutter 51 of the lower thread cutting mechanism 50 rotates from the standby position in the counterclockwise direction in FIG. 3 and advances toward the needle hole. Moreover, when the lower thread catching mechanism 80 catches the lower thread, in the lower thread cutting mechanism 50, the blade of the upper cutter 51 and the blade of the lower cutter 52 are closed, and the cut is between the sewing object and the lower thread catching mechanism 80 Stretched downline.

Then, the CPU 91 presses the motor 49 to raise the cloth presser foot 41 and release the object to be sewn to finish sewing.

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

When the final needle drop position L is set on the extension line of buttonhole B, The stopper 89 is rotated in advance to be adjusted so that the eccentricity of the head 891 of the stopper 89 becomes equal to the left and right. Thereby, as shown in FIG. 7(B), the lower thread captured by the lower thread catching mechanism 80 will be in a state in which the thread catching member 85 is almost along the Z-axis direction from the object to be sewn. The thread cutting mechanism 50 cuts, and further shortens the stump of the thread under the sewn side.

Also, when the final needle drop position L is set to the left side of the extension line of the buttonhole B, the stopper 89 will be rotated and adjusted in advance to a position where the eccentricity of the head 891 of the stopper 89 to the left becomes larger . As a result, as shown in FIG. 8(B), the lower thread captured by the lower thread catching mechanism 80 will become a state in which the thread catching member 85 is almost along the Z-axis direction from the object to be sewn. The thread cutting mechanism 50 cuts, and further shortens the stump of the thread under the sewn side.

Furthermore, it is more desirable to adjust the eccentricity of the stopper 89 so that the final needle drop position L is consistent with the X-axis position of the deepest part of the notch 851 of the thread catching member 85 at the time of thread catching.

In addition, when the final needle drop position L is set to the right side of the extension line of the buttonhole B, the stopper 89 will be rotated in advance to adjust to the position where the eccentricity of the head 891 of the stopper 89 to the right becomes larger. . Thereby, as shown in FIG. 9(B), the lower thread captured by the lower thread catching mechanism 80 will be in a state in which the thread catching member 85 is almost along the Z-axis direction from the sewing object, and the lower thread can be The thread cutting mechanism 50 cuts, and further shortens the stump of the thread under the sewn side.

In this case, it is also ideal to adjust the eccentricity of the stopper 89 so that the final needle drop position L coincides with the position in the X axis direction of the deepest part of the notch 851 of the thread catching member 85 at the time of thread catching.

[Technical effects of the embodiment of the invention]

The lower thread catching mechanism 80 of the buttonhole machine 100 described above is provided with a stopper 89 for adjusting the stop position of the thread catching member 85 at the time of catching the lower thread with respect to the direction orthogonal to the longitudinal direction of the buttonhole (X-axis direction). When performing the final needle drop of the buttonhole stitch on either side of the X-axis direction relative to the buttonhole B, it can still approach in the same direction to capture the thread. And can reduce the inclination of the thread covered by the sewn object to the capture position to be close to vertical, and it becomes possible to further shorten the stub after the lower thread is cut.

In particular, since the stopper 89 is constituted with an adjustment part for adjusting the stop position of the thread catching member 85 when the thread catching member 85 performs the thread catching in the X-axis direction, it becomes possible to carry out threading with a simple structure and simple operation. Adjustment of capture position.

In addition, by forming the adjusting part with the stopper 89, for the existing buttonhole sewing machine, the adjusting part can also be provided by easy modification, and it becomes possible to easily realize the shortening of the stump after the lower thread is cut. Effect.

[Other examples of stoppers]

Although an eccentric screw is exemplified as the stopper 89 of the above-mentioned adjusting portion, it is of course possible to use another member capable of adjusting the stop position of the thread catching member 85 in the X-axis direction.

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, by loosening the screw 891A, the collar 89A can be rotated to change the eccentricity of the thread catching member 85 side, and the screw 891A can be tightened again. Thereby, the stop position of the thread catching member 85 in the X-axis direction can be adjusted.

In addition, 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.

This adjusting body 89B is composed of a bottom plate portion 891B that is in close contact with the bottom surface of the needle plate base 81, and a vertical wall portion 892B that stands at right angles to the right end of the bottom plate portion 891B along the YZ plane, and the vertical wall portion 892B The right side wall surface abuts on the thread catching member 85 to stop it at a predetermined position with respect to the X-axis direction.

In addition, an elongated hole 893B along the X-axis direction is formed through the center of the bottom plate portion 891B, and a screw 894B is inserted into the elongated hole 893B to be fixed to the bottom surface of the throat plate base 81.

At this time, the screw 894B can be loosened to adjust the installation position of the adjusting body 89B in the X-axis direction, and the screw 894B can be tightened again. Thereby, the stop position of the thread catching member 85 in the X-axis direction can be adjusted.

Furthermore, the adjusting body 89B can be formed by, for example, bending processing of a metal plate or sheet metal processing.

[Other examples of offline capture agencies]

In the above embodiment, the adjusting part of the lower thread catching mechanism 80 exemplifies the stopper 89 that requires manual adjustment work, but it is not limited to this, and it may be adjusted by a catching actuator. The structure of the adjusting part of the stop position of the thread catching member 85.

For example, the lower thread catching mechanism 80C as shown in FIG. 13 can also be made, and it has the following configuration: as an actuator, a motor 88C (such as a stepping motor) whose motion can be controlled by the CPU 91 of the control device 90, is installed thereon. The rotating arm 881C of the output shaft of the motor 88C, and the link member 882C connecting the rotating end portion of the rotating arm 881C and the rotating beam portion on the right side of the wire catching beam 86. Furthermore, in the case of this lower thread catching mechanism 80C, the protrusion 841 of the thread pulling beam 84 and the tension spring 88 connected to the thread catching beam 86 are removed, and the thread pulling beam 84 and the thread catching beam 86 are removed. The linkage caused by the connection structure is not performed, and the configuration other than these is the same as that of the lower thread catching mechanism 80.

Thereby, since the CPU 91 can function as an adjusting part, and the deepest part of the notch 851 of the thread catching member 85 can be arbitrarily positioned with respect to the X-axis direction, it becomes possible to further shorten the residual end of the lower thread after the sewing is completed.

It is also possible to set the stop position of the deepest part of the notch 851 of the thread catching member 85 in the X-axis direction at the time of lower thread catching by inputting a numerical value from the operation panel 94, for example.

In addition, 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 use this value to determine the gap 851 of the thread catching member 85 The stop position of the deepest part in the X-axis direction is controlled to be the calculated stop position when the motor 88C is controlled to catch the thread.

In this case, although the stop position in the X-axis direction of the deepest part of the notch 851 of the thread catching member 85 should be consistent with the needle drop position in the X-axis direction of the final needle, it is not To make them completely consistent, and to make the needle drop position and the stop position only approach in the same direction in the left and right directions.

In these cases, as long as the sewing pattern is determined, the cutting of the appropriate lower thread will be automatically executed, so that the workload of the operator of the sewing machine can be drastically reduced.

[other]

Although the cloth feeding mechanism 70 that moves the article to be sewn in the Y-axis direction is exemplified as the feeding mechanism, it is not limited to this. As the feeding mechanism, a mechanism that moves the sewing needle 1 in the Y-axis direction may be provided.

In addition, instead of the swinging needle mechanism 270, a moving mechanism that moves the article to be sewn along the X-axis direction may be provided.

80: offline capture agency

81: Needle plate table

83: Wire pulling component

85: Line snap component

89: Stopper (adjustment part)

851: gap

891: head

892: screw shaft

Claims (4)

A buttonhole machine is provided with: a needle up and down movement mechanism to move the sewing needle up and down; a movement mechanism to relatively move the aforementioned sewing needle relative to the object to be sewn in a direction orthogonal to the longitudinal direction of the buttonhole; Move the article to be sewn relative to the sewing needle in the direction of the long side of the buttonhole; the lower thread cutting mechanism is arranged on the lower side of the article to be sewn during sewing, and cuts the lower thread; and the lower thread catching mechanism , Is arranged on the lower side of the lower thread cutting mechanism and catches the lower thread during cutting. The buttonhole machine is characterized in that: the lower thread catching mechanism includes a thread catching member and a thread pulling member, the thread catching member and the thread The pulling member can move in the direction orthogonal to the longitudinal direction of the buttonhole to approach each other to stop and catch the lower thread in a clamped state, and is equipped with an adjustment part that can be adjusted to the direction orthogonal to the aforementioned buttonhole. The direction of the long side of the buttonhole adjusts the stop position of the thread catching member when the thread catching member is under the thread catching. The buttonhole machine of claim 1, wherein the adjusting part is a stopper that determines the stop position of the thread catching member, and the stopper can change and adjust the abutting position with the thread catching member. The buttonhole machine of claim 1, wherein the lower thread catching mechanism is provided with a catching actuator that performs a catching action of the lower thread of the thread catching member; The direction of the long side of the buttonhole adjusts the stop position of the aforementioned thread catching member. Such as the buttonhole machine of claim 3, which is equipped with a control device that controls the needle up and down mechanism, the movement mechanism, and the feed mechanism, and performs the buttonhole around the predetermined position where the buttonhole or buttonhole is formed The adjusting part controls the capturing actuator so that the stop position of the thread capturing member and the final needle drop position of the buttonhole stitch relative to the predetermined position of the buttonhole or buttonhole are aligned in the same direction .

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