CN106498629B

CN106498629B - Hole serging sewing machine

Info

Publication number: CN106498629B
Application number: CN201610807012.4A
Authority: CN
Inventors: 中西公纪; 山本博嗣; 塚原慎也; 氏家宗久
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2015-09-07
Filing date: 2016-09-07
Publication date: 2021-02-02
Anticipated expiration: 2036-09-07
Also published as: DE102016116720A1; TW201718972A; JP2017051233A; JP6581853B2; TWI746457B; CN106498629A

Abstract

The invention shortens the residual end of the lower wire. A hole serging machine (100) is provided with: a needle up-and-down moving mechanism (20) which moves the needle (1) up and down; a needle swing mechanism (270) which moves the sewing needle in a direction orthogonal to the longitudinal direction of the buttonhole; a feeding mechanism (70) which relatively moves the sewed object in the direction along the length direction of the button hole relative to the sewing needle; a lower thread cutting mechanism (50) which is arranged at the lower side of the sewed object during sewing and cuts the lower thread; and a lower thread catching mechanism which is provided below the lower thread cutting mechanism and catches the lower thread, wherein the hole lockstitch sewing machine (100) is provided with an adjusting part (89), and the adjusting part (89) adjusts a stop position of the thread catching member (85) when catching the lower thread in a direction perpendicular to the length direction of the button hole.

Description

Hole serging sewing machine

Technical Field

The invention relates to a hole serging machine.

Background

The hole lockstitch sewing machine comprises: a needle swing mechanism that swings the needle in a direction orthogonal to the longitudinal direction of the buttonhole; a cloth feeding mechanism which moves the cloth along the length direction of the button hole; a lower thread cutting mechanism which is arranged below the needle plate and cuts the lower thread when sewing is finished; and a lower thread catching mechanism provided below the lower thread cutting mechanism for catching the lower thread at a fixed position.

In addition, when sewing, the cloth feeding mechanism moves the cloth along the button hole, the needle swing mechanism swings the needle around the button hole, and moves the sewing needle up and down to sew the edge in zigzag.

The lower thread catching mechanism slidably contacts the thread catching plate having the concave notch and the tension plate pulling the lower thread toward the thread catching plate in a direction to approach each other, and holds the lower thread at the deepest portion of the concave notch (see, for example, patent document 1).

Patent document 1: japanese patent laid-open No. 2000-271371

However, in the conventional hole-serging sewing machine, the lower thread catching position where the lower thread is caught by the lower thread catching mechanism is fixed to the extension thread of the buttonhole.

In contrast, the position of the last needle to be sewn by the hole-sewing is not limited to the extension line of the buttonhole, and may be set to the left or right of the buttonhole.

As described above, when the position of the last stitch is set to the left or right with respect to the extension line of the buttonhole, the lower thread crossing from the cloth to the catching position where the lower thread is caught by the lower thread catching mechanism is inclined, and the length of the remaining end on the cloth side of the lower thread cut by the lower thread cutting mechanism becomes long.

Disclosure of Invention

The invention aims to provide a hole lockstitch sewing machine capable of shortening the residual end of a lower thread.

(1) The present invention provides a hole lockstitch sewing machine, comprising:

a needle up-and-down moving mechanism which moves the needle up and down;

a moving mechanism for moving the sewing needle in a direction orthogonal to the longitudinal direction of the button hole;

a feeding mechanism for relatively moving the sewing object relative to the sewing needle in a direction along the length direction of the button hole;

a lower thread cutting mechanism which is arranged at the lower side of the sewed object during sewing and cuts the lower thread; and

a lower thread catching mechanism provided below the lower thread cutting mechanism for catching the lower thread,

the hole serging machine is characterized in that,

the offline capturing mechanism is provided with:

a line catching member that catches the lower line; and an adjusting part which adjusts the stop position of the thread catching component when catching the lower thread in the direction orthogonal to the length direction of the button hole.

(2) The invention is characterized in that, in the hole serging machine described in (1),

the adjusting portion is a stopper that determines a stop position of the wire catching member, and the stopper is capable of changing and adjusting an abutting position with the wire catching member.

(3) The invention is characterized in that, in the hole serging machine described in (1),

the lower thread catching mechanism includes a catching actuator for catching the lower thread by the thread catching member,

the adjusting unit controls the catching actuator to adjust a stop position of the thread catching member in a direction perpendicular to a longitudinal direction of the buttonhole.

(4) The present invention is characterized in that, in the hole lockstitch sewing machine described in (3),

the sewing machine is provided with a control device which controls the sewing needle up-and-down moving mechanism, the moving mechanism and the feeding mechanism to carry out hole serging sewing around the button hole or the preset forming position of the button hole,

the adjusting part controls the catching actuator to enable the stopping position of the thread catching component to be close to the needle dropping position of the last needle of the hole serging sewing aiming at the button hole or the preset forming position of the button hole in the same direction.

ADVANTAGEOUS EFFECTS OF INVENTION

The invention has an adjusting part which adjusts the stop position of the thread catching component for catching the lower thread in the direction orthogonal to the length direction of the button hole, therefore, even in the case of the last needle drop of the hole lockstitch sewing in any direction of the direction orthogonal to the length direction relative to the button hole, the lower thread can be close to the same direction to catch the lower thread, the inclination of the lower thread crossing from the sewed object to the catching position can be reduced to be close to vertical, and the residual end after the lower thread is cut can be further shortened.

Drawings

Fig. 1 is an oblique view of a hole lockstitch sewing machine as an embodiment of the invention.

Fig. 2 is a schematic view of the internal structure of the hole serging machine.

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

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

Fig. 5 is an oblique view of the stopper periphery of the lower line catch mechanism.

Fig. 6(a) is an explanatory view showing 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) is an explanatory view showing a state in which the stop position of the wire catching member is adjusted to the left side by the stopper.

Fig. 7(a) is an explanatory view showing the needle falling position of the last needle, and fig. 7(B) is an explanatory view showing the catching position of the thread catching member after the stop position is adjusted in accordance with the needle falling position of the last needle.

Fig. 8(a) is an explanatory view showing the needle falling position of the last needle, and fig. 8(B) is an explanatory view showing the catching position of the thread catching member after the stop position is adjusted in accordance with the needle falling position of the last needle.

Fig. 9(a) is an explanatory view showing a needle falling position of the last needle, and fig. 9(B) is an explanatory view showing a catching position of the thread catching member after the stop position is adjusted corresponding to the needle falling position of the last needle.

Fig. 10 is a block diagram showing a control system of the hole serging sewing machine.

Fig. 11(a) is a plan view of a collar as another example of the adjustment portion, and fig. 11(B) is a front view.

Fig. 12 is a partial sectional view of an adjustment body as another example of the adjustment portion.

Fig. 13 is a bottom view of another example of the lower line catch mechanism.

Description of the reference numerals

1 stitch needle

20 sewing needle up-down moving mechanism

21 needle bar

22 sewing machine motor

27-needle swing motor

270 needle swing mechanism (moving mechanism)

50 lower line cutting mechanism

51 Upper cutter

52 lower cutter

56 actuator

70 cloth feeding mechanism (feeding mechanism)

80. 80C offline capturing mechanism

82 needle board

83 stay wire component

84 wrist with pull string

85 line catching part

86 line catching wrist

88C Motor (actuator for catching)

89 stopper (regulating part)

89A column ring (regulating part)

89B regulator (regulating part)

90 control device

91 CPU (regulating part)

100 Sewing machine

B button hole

Detailed Description

[ outline of hole serging machine ]

Next, a hole lockstitching machine 100 according to the present invention will be described with reference to the drawings. Fig. 1 is an oblique view of a hole lock sewing machine 100, and fig. 2 is a schematic view of an inner structure thereof. In the following description, a cloth feeding direction of the hole lockstitching machine 100 in the horizontal direction is referred to as a Y-axis direction, a direction orthogonal to the Y-axis direction in the horizontal direction is referred to as an X-axis direction, and a vertical up-down direction is referred to as a Z-axis direction. As shown in fig. 1, one side in the Y-axis direction is referred to as "front", the other side is referred to as "rear", one side in the X-axis direction is referred to as "right", and the other side is referred to as "left", as required.

The hole serging machine 100 includes: a cloth feeding mechanism 70 as a feeding mechanism having a feeding plate 71 as a placing part for placing the workpiece thereon, and feeding the workpiece by moving the feeding plate 71 in a fixed feeding direction (hereinafter referred to as "cloth feeding direction (Y axis direction)"); a needle up-down moving mechanism 20 for moving the needle 1 up and down; a needle swing mechanism 270 as a moving mechanism that moves the sewing needle in a direction (X-axis direction) orthogonal to the feed direction; a cloth presser foot 41 as a presser foot member for holding a material to be sewn from above on the feed plate 71; a presser foot lifting mechanism 40 for holding the sewed object on the feeding plate 71 by the cloth presser foot 41; a cutter mechanism 60 for forming a button hole for hole-serging sewing on a sewed object; a thread adjusting device 11 which applies tension to the upper thread; a kettle mechanism for winding the lower line and the upper line; a needle thread cutting device (not shown) for cutting the needle thread; a lower thread cutting mechanism 50 for cutting the lower thread; a lower line catching mechanism 80 that catches the lower line; a control device 90 for controlling the operations of the above-described units; and a sewing machine frame 101 for storing and holding the above-mentioned components. Further, the cloth feeding mechanism 70 (feeding mechanism), the needle vertical moving mechanism 20, and the needle swing mechanism 270 cooperate to perform hole lockstitching on the workpiece placed on the feeding plate 71 (placing portion).

The thread adjusting device 11 and the upper thread cutting device of the hole-serging sewing machine 100 have the same configurations as those of the conventional art, and therefore, detailed descriptions thereof are omitted.

The hole-serging sewing machine 100 is a sewing machine that targets a material to be sewn on which a hole for performing serging is formed. The hole is not limited to a buttonhole, and all holes that require hole hemming can be targeted, but here, a buttonhole in the Y-axis direction is exemplified.

[ Sewing machine frame ]

The sewing machine frame 101 is constituted by: a base part 102 constituting a lower part of the hole sewing machine 100 and extending in the Y-axis direction; a longitudinal body portion 103 provided upright from a rear end portion of the base portion 102; and an arm portion 104 extending forward from an upper end portion of the longitudinal body portion 103 in the Y-axis direction.

The base portion 102 is formed in a substantially rectangular parallelepiped shape, and the long side of the rectangular upper surface portion is along the Y-axis direction. The upper surface of the base portion 102 serves as a working area for placing a workpiece during sewing.

The vertical body section 103 is disposed on the left side of the rear end portion side of the upper surface of the base section 102. Thus, the substantially right half of the upper surface of the base portion 102 can be a work area for placing the workpiece across the entire length in the Y-axis direction.

The arm portion 104 extends forward from the upper end of the longitudinal body portion 103 to the vicinity of the front end of the base portion 102. In the following description, the end surface of the distal end of the arm 104 is referred to as a face 105.

[ Up-and-down moving mechanism of sewing needle ]

The needle vertical movement mechanism 20 has a function of applying a vertical movement operation to a needle bar 21 holding the needle 1. The needle bar 21 is swung in the X-axis direction by a needle swing mechanism 270 provided in the needle vertical movement mechanism 20 while moving vertically, and the needle 1 is swung. As shown in fig. 2, the needle vertical movement mechanism 20 includes: a needle bar 21 holding the sewing needle 1 at a lower end portion; a sewing machine motor 22 as a servo motor, which is a driving source for the up-and-down movement of the needle bar 21; an upper shaft 23 directly connected to an output shaft of the sewing machine motor 22; a weight 24 fixedly attached to the front end of the upper shaft 23; and a crank lever 25 having an upper end portion connected to an eccentric position of the weight 24 eccentric with respect to the rotation center.

The upper shaft 23 is rotatably supported in the Y-axis direction inside the arm 104. An output shaft of the sewing machine motor 22 is coupled to the upper shaft 23.

The lower end of the crank lever 25 is coupled to the needle bar 21 via the needle bar holding portion 31 so as to be rotatable about the Y axis. Therefore, if the weight 24 is rotated via the upper shaft 23 by driving the sewing machine motor 22, the upper end of the crank rod 25 connected to the eccentric position of the weight 24 performs a circular motion, but only the reciprocating motion in the vertical direction of the needle bar 21 is transmitted to the lower end of the crank rod 25.

[ needle swinging mechanism ]

The needle swing mechanism 270 includes: a swing table 26 which supports the needle bar 21 and can reciprocate the needle bar 21 in the longitudinal direction thereof; a needle swing motor 27 (see fig. 10) as a drive source for needle swing; a swing shaft 28 that is reciprocated by the needle swing motor 27; and a swing arm 29 fixedly attached to a distal end portion of the swing shaft 28 and configured to apply a swing motion to the swing base 26.

The swing base 26 is disposed inside the arm 104 and near the face 105, and its upper end is swingably supported by a stepped screw 30 along the Y-axis direction. The swing table 26 supports the needle bar 21 so as to be vertically slidable with the needle 1 side facing downward by 2 metal bearings (not shown) into which the needle bar 21 is inserted.

The swing shaft 28 is rotatably supported in the arm portion 104 in the Y-axis direction. The swinging shaft 28 is inputted with a rotational motion from the rear end side thereof through the needle swinging motor 27.

The swing arm 29 is pivotally supported at the distal end of the swing shaft 28 with its swing end directed downward, and a square stopper 32 is attached to the swing end in a state of being rotatable about the Y axis. The square stopper 32 is fitted into a concave portion of the swing base 26. The concave portion of the swing table 26 has opposing surfaces that slidably contact both side surfaces of the square stopper 32 in the X-axis direction, and allows displacement of the square stopper 32 in the Z-axis direction. Therefore, if the swing arm 29 swings in the X-axis direction in a downward state, the swing in the X-axis direction is applied while allowing the vertical displacement of the square stopper 32 with respect to the swing base 26.

Thus, the needle bar 21 is swung by a predetermined amount in accordance with the needle dropping timing of the needle bar 21 by the sewing machine motor 22, and the needle can be dropped at an arbitrary position in the X-axis direction.

[ kettle mechanism ]

The kettle mechanism has: a lower shaft 33 rotatably supported in the Y-axis direction in the base portion 102; a vertical kettle 34 to which rotation is applied by a lower shaft 33; a drive sprocket 35 attached to the upper shaft 23 for transmitting torque to the lower shaft 33; a driven sprocket, not shown, attached to the lower shaft 33; and a toothed timing belt 36 suspended between the drive sprocket 35 and the driven sprocket.

The number of teeth of the driving sprocket 35 and the driven sprocket is set so that rotation at twice the speed is transmitted from the upper shaft 23 to the lower shaft 33, and the vertical shaft 34 is rotated twice in one vertical movement of the sewing needle 1.

Vertical kettle 34 has: an outer vessel fixedly mounted on the lower shaft 33 and having a tip; and an inner kettle which holds the spool case without rotating. As the vertical kettle 34, a so-called DP kettle is used, which can maintain perfect stitches for the cloth feeding on either the front or rear side.

[ cutter mechanism ]

The cutter mechanism 60 includes: a cloth cutter 61 for forming a hole (buttonhole) for hole overlock sewing by a slit along the Y-axis direction; a base member 62 for holding the cloth cutter 61; a cutter support bar (not shown) which holds the base member 62 at a lower end portion thereof and is supported by the arm portion 104 so as to be movable up and down; and a solenoid 63 (see fig. 10) as an actuator for applying a lifting operation to the cloth cutter 61 via the cutter support rod.

The cloth cutter 61 is attached to the rear of the sewing needle 1, and is supported by the base member 62 so that its blade surface is parallel to the Y-Z plane. Therefore, by lowering the cloth cutter 61, a buttonhole can be formed in the Y-axis direction in the workpiece.

The base member 62 is attachable to and detachable from the cloth cutter 61, and can be replaced with the cloth cutter 61 having a different tooth width to form holes having different sizes.

The cutter support rod is always biased upward by an unillustrated tension spring, and the solenoid 63 lowers the cloth cutter 61 against the tension spring at the time of cutting.

[ cloth feed mechanism ]

The cloth feeding mechanism (feeding mechanism) 70 includes: a rectangular feed plate 71 disposed on the upper surface of the base 102; a feed base 73 supported by the base part 102 so as to be slidable in the Y-axis direction by the 2

guide shafts

72 and 72; a feed motor 74 serving as a drive source for feeding the cloth in the Y-axis direction; and a timing belt 76 stretched between the 2 pulleys 75, 75.

The

guide shafts

72, 72 are both fixedly supported in the base portion 102 in a state parallel to the Y-axis direction.

The feed plate (placement portion) 71 is disposed on the upper surface of the base portion 102 so that the long side thereof is parallel to the Y-axis direction, and a long hole 711 extending in the Y-axis direction is formed in the vicinity of the distal end portion thereof and substantially in the center in the X-axis direction so as to penetrate in the vertical direction. The long hole 711 is formed to have a width sufficiently larger than the needle swing width, and a needle plate 82 is disposed below the feed plate 71, and the needle plate 82 is formed with a slit-shaped opening portion in the Y-axis direction into which the cloth cutter is inserted and a needle hole in the X-axis direction (not shown in fig. 1) that allows the needle to swing.

The feed base 73 is slidably supported by the

guide shafts

72 and 72 via slide bearings, not shown, and the feed plate 71 is held on the upper portion thereof.

One of the 2 pulleys 75, 75 is attached to an output shaft of the feed motor 74, and the other is rotatably supported on an inner wall of the base portion 102. The

pulleys

75 and 75 are rotatable about the X axis, and a timing belt 76 disposed between the pulleys is arranged in a state of extending in the Y axis direction.

A part of the timing belt 76 is coupled to a lower portion of the feed base 73, and if the feed motor 74 is rotationally driven, the feed base 73 and the feed plate 71 are moved in the Y-axis direction via the timing belt 76.

Therefore, the workpiece held by the cloth presser foot 41 on the upper surface of the feed plate 71 can be arbitrarily moved and positioned in the Y-axis direction by controlling the operation of the feed motor 74. Further, as described above, since the needle 1 can be dropped at an arbitrary position in the X-axis direction by the needle vertical moving mechanism 20, the needle can be dropped at an arbitrary position in the X-Y plane on the workpiece by the cooperative operation of the needle vertical moving mechanism 20 and the cloth feeding mechanism 70.

[ pressure foot raising mechanism ]

The presser foot lifting mechanism 40 includes: a cloth presser foot 41 (presser foot member) that presses a material to be sewn on an upper surface of the feed plate 71; a presser foot arm 43 for supporting the cloth presser foot 41; a slide roller 44 as a pressing body for pressing the presser arm 43 downward; and a presser foot motor 49 for raising and lowering the cloth presser foot 41 against the slide roller 44.

The presser foot arm 43 is elongated in the Y-axis direction, and its rear end portion is supported on the upper surface of the feed plate 71 so as to be rotatable about the X-axis. This enables the cloth presser 41 supported by the front end of the presser arm 43 to move up and down.

The cloth presser foot 41 is a rectangular flat plate along the X-Y plane, and has an opening in the central portion thereof within a range in which a hole-seaming stitch can be formed.

Since the slide roller 44 can rotate along the upper surface of the presser arm 43 in the Y-axis direction, even when the presser arm 43 moves in the Y-axis direction, a downward pressing force can be applied without interfering with the movement.

[ lower line catching mechanism ]

Fig. 3 is a bottom view of the lower thread cutting mechanism 50 and the lower thread catching mechanism 80.

As shown in the drawing, the lower thread catching mechanism 80 mainly includes: a needle board table 81 fixedly mounted on the base portion 102 below the feeding plate 71; a needle plate 82 provided on an upper surface of the needle plate table 81; a thread pulling member 83 and a thread pulling wrist 84 provided on the bottom surface side of the needle board table 81; a thread catching member 85 and a thread catching wrist 86 provided on the bottom surface side of the needle plate base 81; a transmission lever 87 that applies a rotational force of the wire catching operation to the wire pulling wrist 84; a motor for moving the transmission rod 87 up and down; and an actuator 56 constituted by a solenoid or a cylinder.

The platen table 81 is a substantially rectangular flat plate along the X-Y plane, and has an opening 811 in the center. The needle plate 82 is provided in a suspended state in an opening 811 of the needle plate table 81. The needle plate 82 is a flat plate elongated in the Y-axis direction, and a slit-shaped insertion hole in the Y-axis direction into which the cloth cutter 61 is inserted and a slit-shaped needle hole in the X-axis direction that allows needle oscillation are formed so as to penetrate through the needle plate 82 adjacent to each other. That is, the needle plate 82 is disposed at a needle fall position of the needle plate 81 and a lowered position of the cloth cutter 61.

The opening 811 of the needle board table 81 is formed in a range that allows the needle drop and the cloth cutter 61 to descend, and upper and

lower cutters

51 and 52 of the lower thread cutting mechanism 50 described later are disposed inside the opening 811, and the opening 811 is formed wider so as to allow the cutting operation by the upper and

lower cutters

51 and 52.

The pull-string arm 84 is a plate-like crank extending along the X-Y plane, and is attached to the rear side of the opening 811 on the bottom surface of the needle board table 81 by a stepped screw so as to be rotatable about the Z axis. A proximal end portion provided with the wire member 83 is fixed by a screw to a rotation arm portion on a side extending substantially forward from a stepped screw serving as a rotation shaft. Further, one end of the transmission rod 87 is connected to the other rotation arm portion extending substantially rearward from the stepped screw serving as the rotation shaft so as to be rotatable about the Z axis. When the offline capturing operation is performed, the tension is input from the transmission lever 87 to the left, and the pull-cord wrist 84 performs the clockwise rotation operation in fig. 3.

In addition, a projecting portion 841 projecting forward is formed in the vicinity of the rotation center position of the pull wrist 84. The projection 841 is disposed so as to abut against a projection 861 formed at the outer edge of the below-described string catching arm 86, and is configured to act on the string catching arm 86 during the lower string catching operation so that the string catching arm 86 rotates in an interlocking manner in the opposite direction to the pull string arm 84.

The wire member 83 is a long plate along the X-Y plane, and has a base end portion fixedly connected to a pivot end portion of the wire arm 84 and a tip end portion extending substantially forward. The pull-up member 83 is rotated integrally with the pull-up wrist 84 during the lower thread take-up operation.

The thread pulling member 83 stands by on the left side of the needle hole before the start of the thread take-up operation, and rotates to the right side if the start of the thread take-up operation is started. Thereby, the lower thread is brought into contact with the right edge of the thread pulling member 83, and the lower thread can be pulled to the thread catching member 85 positioned on the right side.

The thread catching wrist 86 is a plate-like crank extending along the X-Y plane, and is attached to the right side of the opening 811 on the bottom surface of the needle board table 81 by a stepped screw so as to be rotatable about the Z axis. A proximal end portion of the wire catching member 85 is fixed by a screw to a rotation arm portion on a side extending substantially forward from a stepped screw serving as a rotation shaft. Further, a tension spring 88 for applying counterclockwise rotation in fig. 3 to the line catch arm 86 is coupled to the other rotation arm portion extending from the shoulder screw serving as the rotation shaft toward substantially the right. The end of the tension spring 88 on the opposite side is fastened to the needle bed 81 with a screw.

The wire catching arm 86 has a convex portion 861 extending leftward of the stepped screw serving as a rotation axis thereof, and the rear outer edge portion of the convex portion 861 abuts against the boss 841 of the wire pulling arm 84. The function of the projection 861 will be described later.

The wire catching member 85 is a flat plate shape along the X-Y plane, and has a base end portion extending linearly rearward, a middle portion bent leftward by 90 °, and a tip end portion having a substantially rectangular shape.

The front end portion of the wire catching member 85 has a V-shaped notch 851 opened to the left side at the left edge portion thereof. When catching the lower thread, the thread drawing member 83 rotates clockwise, the thread catching member 85 rotates counterclockwise, the lower thread is brought close to the deepest portion (rightmost side) of the notch 851, and the right edge portion of the thread drawing member 83 catches the lower thread when passing through the deepest portion of the notch 851.

As shown in fig. 4, the wire catching member 85 is positioned above the wire member 83, and the lower surface of the wire catching member 85 and the upper surface of the wire member 83 are in sliding contact with each other. Therefore, when catching the lower thread, the lower thread is pulled in and held between the thread pulling member 83 and the thread catching member 85. Thereby, a downward tension is applied to the lower thread, and the sewn article is slightly pulled downward. Since the lower thread cutting mechanism 50 described later cuts the lower thread in this state, the remaining end of the lower thread of the material to be sewn can be shortened.

Here, the function of the convex portion 861 of the wire catching wrist 86 will be described.

As described above, the wire catching wrist 86 is in a state in which the wire catching member 85 is rotated in the movement direction during wire catching by the counterclockwise rotational force applied by the tension spring 88.

On the other hand, before the wire pulling wrist 84 starts the wire catching operation, a counterclockwise rotational force is input from the transmission lever 87, and the wire pulling member 83 is set to the standby position (the position on the left side of the needle hole). At this time, the boss 841 of the thread take-up arm 84 presses the boss 861 of the thread take-up arm 86, and presses the thread take-up arm 86 back along the clockwise direction against the tension spring 88, and the thread take-up member 85 is maintained at the standby position (the position located on the right side of the needle hole).

Further, at the time of the wire catching, a clockwise rotational force is input from the transmission lever 87 to the wire pulling arm 84, and therefore the wire catching arm 86 rotates counterclockwise with the tension of the tension spring 88. Therefore, the wire pulling member 83 rotates rightward, and the wire catching member 85 rotates leftward in conjunction therewith.

That is, the convex portion 861 of the wire catching wrist 86 is rotated in a direction to approach each other in an interlocking manner from a state in which the wire member 83 and the wire catching member 85 are located at the respective standby positions by the cooperative operation with the convex portion 841 of the wire catching wrist 84. Thus, as described above, the lower thread can be guided and held in the deepest portion of the notch 851 of the thread catching member 85.

The lower thread catching mechanism 80 further includes a stopper 89 as an adjusting portion, and the stopper 89 adjusts a stop position at the time of catching the lower thread by the thread catching member 85 in the X-axis direction. By adjusting the stop position of the wire catching member 85 at the time of catching in the X-axis direction, the inclination angle at the time of cutting the lower wire can be adjusted.

As shown in fig. 3 and 5, the stopper 89 is formed of an eccentric screw in which the outer periphery of the head portion 891 abuts against the left edge portion of the base end portion of the wire catching member 85. That is, the stopper 89 is provided at a position eccentric from the center of the head 891 by a screw shaft 892 screwed into a screw hole formed in the bottom surface of the needle plate 81. Thus, the eccentric amount of the head portion 891 in the X-axis direction is varied by rotating the stopper 89, and the stop position at the time of the wire catching operation of the wire catching member 85 can be adjusted as shown in fig. 6(a) and 6 (B).

Note that reference numeral 893 denotes a nut which serves as a screw-out stopper of the rotation-adjusting stopper 89.

As shown in fig. 7, in the stopper 89, when the eccentric amount of the head portion 891 is uniform in the left-right direction in the X axis direction (at the neutral position), the stop position at the time of catching the deepest portion of the slit 851 of the thread catching member 85 can be matched with the position directly below the tip end of the needle 1 in a state of not swinging in the left-right direction (at the neutral position).

As shown in fig. 8, when the eccentric amount of the head portion 891 is maximized to the left in the X axis direction, the stopper 89 can match the stop position at the time of catching the deepest portion of the notch 851 of the thread catching member 85 with the position directly below the tip of the needle 1 in the state of maximum leftward swinging.

As shown in fig. 9, when the eccentric amount of the head portion 891 is maximized to the right in the X axis direction, the stopper 89 can match the stop position at the time of catching the deepest portion of the notch 851 of the thread catching member 85 with the position directly below the tip of the needle 1 in the state of swinging to the right.

[ lower line cutting mechanism ]

The lower thread cutting mechanism 50, as shown in fig. 3, includes: an upper blade 51 connected to the bottom surface of the needle plate table 81 and to the left front side of the opening 811 such that the base end of the upper blade 51 is rotatable about the Z axis; a lower cutter 52 coupled to a lower surface of the other end of the upper cutter 51 to be rotatable about the Z axis; a leaf spring 53 that is coaxial with the lower blade 52 and is coupled to the lower surface of the lower blade 52 so as to be rotatable about the Z axis; and a link rod 54 for connecting the upper cutter 51 to the wire pulling wrist 84 of the lower wire catching mechanism 80 to rotate the upper cutter 51 in a linked manner.

The upper blade 51, the lower blade 52, and the plate spring 53 of the lower thread cutting mechanism 50 are disposed below the needle plate 82 and above the thread pulling member 83 and the thread catching member 85 of the lower thread catching mechanism 80.

The upper cutter 51 is plate-shaped along the X-Y plane, and as described above, has a base end portion supported on the needle bed 81 so as to be rotatable about the Z axis, and has a tip formed at a rotating end portion thereof for cutting the lower thread. The cutting edge of the upper cutter 51 is formed to be substantially along the X-axis direction at the front edge of the turning end. Before the cutting operation, the cutting edge is located at a left rear standby position with respect to the pinhole, and during the cutting operation, the upper cutter 51 is rotated counterclockwise in fig. 3, and the cutting edge is disposed close to the immediate left side of the pinhole.

The rotation of the upper cutter 51 at the time of cutting is inputted from the pull-cord wrist 84 via the link lever 54.

The lower cutter 52 is plate-shaped along the X-Y plane, and has a blade edge formed at a rotation end extending leftward from the rotation center thereof, the blade edge cutting the lower wire by cooperating with the upper cutter 51. The edge of the lower cutter is formed along the X-axis direction at the edge of the rear side of the rotating end. Before the cutting operation, the cutting edge of the lower cutter 52 is located at a standby position facing the front side of the cutting edge of the upper cutter 51, and when cutting, the cutting edge is rotated rearward with the rotation of the upper cutter 51, and the cutting edges are closed to cut the object while reaching below the pinhole.

The lower cutter 52 has a projection 521 formed on the front edge thereof and projecting forward, and the projection 521 abuts against the inner edge of the opening 811 of the needle plate 81 by counterclockwise rotation of the upper cutter 51 and rotates in the direction of closing the cutting edge with respect to the upper cutter 51.

The plate spring 53 is plate-shaped along the X-Y plane, and has a shape substantially identical to the rotating end of the upper blade 51 when viewed from below as viewed from an extending end extending leftward from the center of rotation thereof. Further, at the time of cutting of the lower wire, the rotating end portion of the lower cutter 52 enters between the rotating end portion of the upper cutter 51 and the extending end portion of the plate spring 53. Thereby, the lower wire is cut between the upper cutter 51 and the lower cutter 52, and the cut end of the lower wire extending from the vertical kettle 34 is sandwiched between the lower cutter 52 and the plate spring 53.

Further, reference numeral 55 denotes a lever which rotates the lower blade 52 in the direction in which the blade edge is opened before starting sewing and releases the lower thread.

[ control System of hole lockstitch sewing machine ]

Fig. 10 is a block diagram showing a control system of the hole serging sewing machine 100. The hole-serging machine 100 includes a control device 90 as an operation control means for controlling the operations of the above-described respective components. 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 which becomes a work area of the CPU 91; and an EEPROM 96 for storing sewing pattern data for the serging sewing and various setting data required for the operation control of the sewing machine, and capable of rewriting the stored contents.

Further, the CPU 91 is connected via an interface not shown with: a sewing machine motor driver 22a connected to the sewing machine motor 22 and an encoder 221 for detecting a rotation angle of the sewing machine motor 22; a needle swing motor driver 27a that drives the needle swing motor 27; a feed motor driver 74a that drives the feed motor 74; a presser foot motor driver 49a connected to the presser foot motor 49 and the encoder 46 for detecting the rotation angle of the presser foot motor 49; a driver 56a of the actuator 56 for performing the lower line catching operation and the lower line cutting operation; a solenoid driver 63a for driving the solenoid 63 for lifting the cloth cutter 61; and a wire adjusting solenoid driver 111a that drives a wire adjusting solenoid 111 as a wire tension driving source of the wire adjusting device 11.

Further, the CPU 91 is connected to: an operation panel 94 for inputting various settings related to sewing such as selection of sewing pattern data for hole lockstitch sewing; and a start switch 95 which inputs the start of sewing.

[ Sewing action of hole lockstitch sewing machine ]

The sewing operation of the hole-serging sewing machine 100 will be described.

The sewing pattern data recorded in the EEPROM 96 of the hole serging sewing machine 100 described above is recorded with data indicating the needle drop position of each needle of the hole serging sewing formed around the button hole.

If the CPU 91 of the control device 90 reads out the predetermined sewing pattern data selected by the operation panel 94 from the EEPROM 96, the operation amounts of the needle swing motor 27 and the feed motor 74 for sequentially moving the needles to the respective needle drop positions are calculated for all the needles from the first needle to the last needle.

Then, if the start switch 95 is pressed, the CPU 91 starts the driving of the sewing machine motor 22 to start the sewing.

After the start of the driving of the sewing machine motor 22, the shaft angle is read by the encoder 221, and if the shaft angle reaches a predetermined shaft angle, the sewing machine is driven based on the calculated operation amounts of the needle swing motor 27 and the feed motor 74 to position the target position of the sewing needle 1 in the X-axis direction, position the target position of the workpiece in the Y-axis direction, and carry out needle transfer for each needle to the target needle drop position.

Then, if the needle feed for all the needle drop positions specified by the sewing pattern data is completed, the CPU 91 stops the sewing machine motor 22.

Further, the formation of the buttonhole by the cutter mechanism 60 can be set in advance to be performed either before or after the hole lockstitch.

In the case before the hole lockstitch is set, the formation of the buttonhole by the cutter mechanism 60 is performed before the start of the driving of the sewing machine motor 22, and then the hole lockstitch is formed around the buttonhole.

In addition, when the hole is set to be sewn after the overlock sewing, the driving of the sewing machine motor 22 is started to form a hole overlock stitch around the position where the buttonhole is to be formed, and then the buttonhole is formed by the cutter mechanism 60.

Further, the CPU 91 cuts off the on-line and off-line.

Before the lower thread cutting operation is started, the thread pulling member 83 of the lower thread catching mechanism 80 is positioned at the left standby position of the needle hole, and the thread catching member 85 is positioned at the right standby position of the needle hole. Subsequently, from these states, the actuator 56 is operated to rotate the wire pulling wrist 84 clockwise in fig. 3, and the wire pulling member 83 is rotated toward the needle hole. The thread catching wrist 86 rotates counterclockwise in fig. 3 in conjunction with the thread pulling wrist 84, and the thread catching member 85 rotates toward the needle hole.

Then, the wire catching member 85 abuts on the stopper 89 to stop the rotation at a predetermined position, but the rotation operation is continued until the wire pulling member 83 passes below the needle hole. Thereby, the lower thread is caught in the deepest part of the slit 851 of the thread catching member 85 which has been stopped previously.

Further, the upper cutter 51 of the lower thread cutting mechanism 50 rotates counterclockwise in fig. 3 from the standby position with the clockwise rotation of the pull tab 84, and advances toward the needle hole. Further, if the lower thread is caught by the lower thread catching mechanism 80, the lower thread cutting mechanism 50 closes the edge of the upper cutter 51 and the edge of the lower cutter 52, and cuts the lower thread stretched between the material to be sewn and the lower thread catching mechanism 80.

Then, the CPU 91 raises the cloth presser 41 by the presser motor 49 to loosen the material to be sewn, and the sewing is completed.

Here, in the sewing pattern data, the needle drop position L of the last needle may be as follows: as shown in fig. 7(a), set on the extension line of the button hole B; as shown in fig. 8(a), the extension line with respect to the button hole B is set on the left side; and as shown in fig. 9(a), set on the right side with respect to the extension line of the buttonhole B.

When the needle falling position L of the last needle is set on the extension line of the button hole B, the stopper 89 is rotationally adjusted to a position where the eccentric amount of the head 891 of the stopper 89 is equal to the right and left. As a result, as shown in fig. 7(B), the lower thread caught by the lower thread catching mechanism 80 is in a state substantially along the Z-axis direction from the material to be sewn to the thread catching member 85, and the lower thread cutting mechanism 50 cuts the lower thread in this state, whereby the remaining end of the lower thread on the side of the material to be sewn can be further shortened.

When the needle drop position L of the last needle is set to the left side on the extension line of the button hole B, the stopper 89 is rotationally adjusted to a position where the amount of eccentricity to the left side of the head 891 of the stopper 89 is increased. As a result, as shown in fig. 8(B), the lower thread caught by the lower thread catching mechanism 80 is in a state substantially along the Z-axis direction from the material to be sewn to the thread catching member 85, and the lower thread cutting mechanism 50 cuts the lower thread in this state, whereby the remaining end of the lower thread on the side of the material to be sewn can be further shortened.

Further, it is preferable to adjust the eccentric amount of the stopper 89 so that the needle drop position L of the last needle coincides with the position in the X axis direction of the deepest portion of the notch 851 of the thread catching member 85 at the time of thread catching.

When the needle drop position L of the last needle is set to the right side on the extension line of the button hole B, the stopper 89 is rotationally adjusted to a position where the amount of right-side eccentricity of the head 891 of the stopper 89 is increased. As a result, as shown in fig. 9(B), the lower thread caught by the lower thread catching mechanism 80 is in a state substantially along the Z-axis direction from the material to be sewn to the thread catching member 85, and the lower thread cutting mechanism 50 cuts the lower thread in this state, whereby the remaining end of the lower thread on the side of the material to be sewn can be further shortened.

In this case, too, the eccentric amount of the stopper 89 is preferably adjusted so that the needle drop position L of the last needle 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 embodiments of the invention ]

The lower thread catching mechanism 80 of the hole serging machine 100 includes the stopper 89, and the stopper 89 adjusts the stop position of the thread catching member 85 at the time of catching the lower thread in the direction (X-axis direction) orthogonal to the longitudinal direction of the buttonhole, so that even in the case of needle drop of the last needle of the hole serging sewing in any left and right sides of the X-axis direction with respect to the buttonhole B, the lower thread can be caught by approaching in the same direction, the inclination of the lower thread crossing from the sewing object to the catching position can be reduced to be nearly vertical, and the residual end after the lower thread cutting can be further shortened.

In particular, since the stopper 89 is provided as an adjusting portion for adjusting the stop position of the wire catching member 85 at the time of catching the lower wire in the X-axis direction, the lower wire catching position can be adjusted by a simple operation with a simple configuration.

Further, since the adjustment portion is constituted by the stopper 89, the adjustment portion can be provided by easy modification even in the conventional hole serging machine, and the effect of further shortening the remaining end after the lower thread is cut can be easily achieved.

[ other examples of stoppers ]

The stopper 89 as the adjusting portion is exemplified by an eccentric screw, but it is needless to say that another member capable of adjusting the stop position of the wire catching member 85 in the X axis direction may 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. In this case, the screw 891A is screwed out to rotate the collar 89A, thereby changing the eccentric amount on the wire catching member 85 side and re-tightening the screw 891A. This enables adjustment of the stop position of the wire capture member 85 in the X axis direction.

As shown in fig. 12, an adjuster 89B that slides in the X-axis direction to adjust the position may be provided at the same position as the stopper 89.

The adjuster 89B is composed of: a bottom plate portion 891B closely contacted with the bottom surface of the needle plate table 81; and an upright wall portion 892B that stands at a right angle from the right end portion of the bottom plate portion 891B and follows the Y-Z plane, and a right side wall surface of the upright wall portion 892B abuts against the wire catching member 85 and stops at a predetermined position in the X axis direction.

A long hole 893B extending in the X-axis direction is formed through the center of the bottom plate 891B, and a screw 894B is inserted into the long hole 893B and fixed to the bottom surface of the needle bed 81.

In this case, the screw 894B is screwed out to adjust the mounting position of the adjuster 89B in the X-axis direction, and the screw 894B is tightened again. This enables adjustment of the stop position of the wire capture member 85 in the X axis direction.

The adjuster 89B can be formed by, for example, bending a metal plate or sheet metal working.

[ other examples of lower line catching mechanisms ]

In the above embodiment, the stopper 89 that requires the adjustment operation by the manual operation is exemplified, but the adjustment portion of the lower thread catching mechanism 80 is not limited thereto, and may be configured to have an adjustment portion that adjusts the stop position of the thread catching member 85 by a catching actuator.

For example, as shown in fig. 13, the lower line catch mechanism 80C includes the following components: a motor 88C (e.g., a stepping motor) as an actuator, the operation amount of which can be controlled by the CPU 91 of the control device 90; a rotation arm 881C provided on an output shaft of the motor 88C; and a lever member 882C connecting the pivot end of the pivot arm 881C to the right pivot arm of the thread catching arm 86. In the case of the lower thread catching mechanism 80C, the configuration may be the same as that of the lower thread catching mechanism 80 except that the boss 841 of the pull cord wrist 84 and the tension spring 88 coupled to the cord catching wrist 86 are eliminated, and the pull cord wrist 84 and the cord catching wrist 86 do not perform the interlocking by the coupling structure.

Thus, the CPU 91 functions as an adjusting portion, and can arbitrarily position the deepest portion of the notch 851 of the thread catching member 85 in the X-axis direction, so that the remaining end of the lower thread after completion of sewing can be further shortened.

The stop position in the X axis direction of the deepest portion of the notch 851 of the thread catching member 85 at the time of lower thread catching may be set by inputting a numerical value from the operation panel 94, for example.

The CPU 91 of the control device 90 may read the sewing pattern data selected for sewing, calculate the needle fall position in the X axis direction of the last needle, determine the stop position in the X axis direction of the deepest part of the notch 851 of the thread catching member 85 in accordance with the calculated needle fall position, and control the motor 88C so that the deepest part of the notch 851 of the thread catching member 85 is at the calculated stop position when the lower thread is caught.

In this case, the stop position in the X axis direction of the deepest portion of the slit 851 of the thread catching member 85 preferably coincides with the needle falling position in the X axis direction of the last needle, but if not perfectly coincides, the needle falling position and the stop position may be brought closer in the same direction in the left-right direction.

In these cases, if the sewing pattern is decided, the appropriate lower thread cutting is automatically performed, so that the work load of the operator of the sewing machine can be significantly reduced.

[ others ]

The cloth feeding mechanism 70 for moving the workpiece in the Y-axis direction is exemplified as the feeding mechanism, but the feeding mechanism is not limited to this, and a mechanism for moving the sewing needle 1 in the Y-axis direction may be provided as the feeding mechanism.

Further, instead of the needle swing mechanism 270, a moving mechanism for moving the workpiece in the X-axis direction may be provided.

Claims

1. A hole serging machine is provided with:

a needle up-and-down moving mechanism which moves the needle up and down;

a moving mechanism for moving the sewing needle relative to the sewed object along a direction orthogonal to the length direction of the button hole;

a lower thread catching mechanism provided below the lower thread cutting mechanism for catching the lower thread at the time of cutting,

the hole serging machine is characterized in that,

the offline capturing mechanism is provided with: a thread catching member and a thread pulling member which move in a direction approaching each other in a direction orthogonal to a longitudinal direction of the buttonhole, and which stop in a state of holding the lower thread to catch the lower thread; and an adjusting part which adjusts a stop position when the thread catching member catches the lower thread in a direction orthogonal to a longitudinal direction of the buttonhole.

2. The hole lockstitch sewing machine according to claim 1,

3. The hole lockstitch sewing machine according to claim 1,

4. The hole lockstitch sewing machine according to claim 3,