CN107304496B

CN107304496B - Sewing machine

Info

Publication number: CN107304496B
Application number: CN201710261334.8A
Authority: CN
Inventors: D·D·阮
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2016-04-20
Filing date: 2017-04-20
Publication date: 2021-04-23
Anticipated expiration: 2037-04-20
Also published as: JP6884513B2; JP2017192530A; CN107304496A

Abstract

The invention performs colorful sewing of the front fly. The sewing machine is provided with: a cloth presser foot for holding the cloth of the clothes body and the cloth of the front fly; a cloth moving mechanism which enables the cloth presser foot to move randomly along the plane for loading the cloth of the clothes body; a sewing needle up-and-down moving mechanism which performs needle dropping on the cloth of the clothes body and the cloth of the front door front kept by the cloth presser foot; a cutter mechanism for forming a cutting seam in a direction along which the body fabric and the front fly fabric held by the fabric presser foot are fixed; and controlling means, it controls cloth presser foot, cloth moving mechanism, seam needle reciprocating motion and cutter mechanism, and controlling means controls cloth moving mechanism and seam needle reciprocating motion, forms first stitch seam and second stitch seam, controls the cutter mechanism, forms the joint-cutting between first stitch seam and second stitch seam, and this sewing machine possesses: the first folding mechanism folds back the front fly cloth along a first line; and a second folding mechanism which folds back the front fly cloth along a second line.

Description

Sewing machine

Technical Field

The present invention relates to a sewing machine for sewing a front fly.

Background

As shown in fig. 22, a conventional sewing machine 1000 for sewing a front fly includes: a needle up-and-down moving mechanism 1100 which forms two stitches from the collar toward the lower side with respect to a front fly fabric N arranged on the chest of a body fabric K: a cutter mechanism 1200 that forms a cut along two stitch lines between the two stitch lines; and a cloth presser mechanism 1300 that presses the body cloth K and the front fly cloth N from above and moves the body cloth K and the front fly cloth N in directions along two stitches (see, for example, patent document 1).

Patent document 1: japanese patent laid-open publication No. 2005-110963

In addition, the sewing of the front fly comprises the following steps: as shown in fig. 23(a) and 23(B), a front fly fabric N is disposed on the chest of a body fabric K; forming two stitches n1, n2 (fig. 23 (C)); forming a slit c (fig. 23(D)) between the stitches n1, n 2; folding the parts of the two sides of the cutting seam c of the front fly fabric N towards the inner side of the body fabric K respectively (figure 23 (E)); and folding each portion into a rectangle and sewing (fig. 23 (F)).

The sewing of the front fly formed by this step is a simple basic type sewing, and the conventional sewing machine can form only two stitches n1 and n2 and a slit c as shown in fig. 23 (D).

However, in the sewing of the front fly, it is strongly required to form the stitches more colorful than the basic sewing. For example, there is a demand for sewing the front fly by folding back the left and right sides of the front fly fabric N with the stitches N1 and N2 as creases, respectively, and forming decorative threads (Top tack) formed in the vicinity of the respective creases, but the conventional sewing machine cannot perform the sewing.

Therefore, the decorative thread must be formed by another sewing machine or by hand sewing, and the front fly cannot be efficiently sewn.

Disclosure of Invention

The present invention aims to more efficiently sew a colorful front fly, and has the following characteristics (1) to (7).

(1)

A sewing machine is provided with:

a cloth presser foot for holding the cloth of the clothes body and the cloth of the front fly;

a cloth moving mechanism for moving the cloth presser foot arbitrarily along a plane on which the cloth of the clothes body is placed;

a needle up-and-down moving mechanism for dropping the cloth of the clothes body and the cloth of the front fly held by the cloth presser foot;

a cutter mechanism for forming a slit in a direction along which the body fabric and the front fly fabric held by the fabric presser foot are fixed; and

a control device for controlling the cloth presser foot, the cloth moving mechanism, the sewing needle up-down moving mechanism and the cutter mechanism,

the control device is used for controlling the operation of the motor,

controlling the cloth moving mechanism and the sewing needle up-and-down moving mechanism to form a first stitch and a second stitch,

controlling the cutter mechanism to form a cut between the first stitch and the second stitch,

the sewing machine is characterized by comprising:

a first folding mechanism for folding back the front fly fabric along the first locus; and

and the second folding mechanism folds the front fly cloth along the second trace.

(2)

The sewing machine according to the above (1), wherein,

the control device sequentially executes the following controls:

a first sewing control for controlling the cloth moving mechanism and the sewing needle up-and-down moving mechanism to form the first stitch and the second stitch;

a first folding control for controlling the first folding mechanism to fold the front fly cloth along the first trace;

a second sewing control of controlling the cloth moving mechanism and the needle up-and-down moving mechanism to form a first folding-back stitch between the first stitch of the front fly cloth folded back by the first folding-back mechanism and a formation position of a cutting seam realized by the cutter mechanism;

second folding control, controlling the second folding mechanism, and folding the front fly cloth along the second trace; and

and the third sewing control is used for controlling the cloth moving mechanism and the sewing needle up-and-down moving mechanism, and a second folding stitch is formed between the second stitch of the front fly cloth folded back by the second folding mechanism and the formation position of the cutting seam realized by the cutter mechanism.

(3)

The sewing machine according to the above (2), wherein,

a third folding mechanism for folding the front fly fabric along the second folding trace,

the control device sequentially executes the following controls:

third folding control, namely controlling the third folding mechanism to fold the front fly cloth along the second folding trace; and

and controlling the formation of the cutting seams, namely controlling the cutter mechanism to form the cutting seams at the formation positions of the cutting seams of the cloth of the clothes body and the cloth of the front placket.

(4)

The sewing machine described in the above (3), characterized in that,

the third folding mechanism has: a front fly cloth presser foot that presses the front fly cloth from above by a lowering operation; and an air blowing mechanism which is mounted on the front fly cloth presser foot and blows air to the front fly cloth.

(5)

The sewing machine according to any one of the above (1) to (4), characterized in that,

the first folding mechanism includes: a front flap plate that reciprocates across a position where a slit is formed by the cutter mechanism; an actuator serving as a drive source for moving the front flap; and a support mechanism that supports the front flap so as to be capable of the reciprocating movement,

the front fly flap folds the front fly fabric along the first trace by the movement of going out of the way, and presses the front fly fabric folded along the second trace from above by the movement of returning in the way,

the support mechanism has a cam mechanism that moves the outward movement of the front flap at a position lower than the return movement.

(6)

The sewing machine according to the above (5), wherein,

the first folding mechanism includes an auxiliary presser foot plate disposed at a position where the cutting seam is formed by the cutter mechanism with respect to the front flap plate located at the start position of the reciprocating movement,

the support mechanism includes a link mechanism that reciprocates the auxiliary presser foot plate and the front fly flap in a linked manner within a range that does not cross a position where a slit is formed by the cutter mechanism.

(7)

The sewing machine according to any one of the above (1) to (6),

the second folding mechanism is provided with an air supply mechanism which supplies air to the front placket front cloth.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention is provided with: the first folding mechanism folds back the front fly cloth along a first line; and a second folding mechanism that folds the front fly cloth along the second line, so that the front fly can be sewn in such a manner that decorative lines are formed near the respective folds, and the front fly can be sewn in a variety of ways.

In addition, the present invention can form the decorative thread through other processes or manual operation, so that the sewing operation can be performed quickly and efficiently.

Drawings

Fig. 1(a) to 1(I) are explanatory views showing steps of sewing a front fly.

Fig. 2 is a perspective view showing the sewing machine according to the first embodiment.

Fig. 3 is an oblique view of the cloth presser foot.

Fig. 4 is an oblique view of the first folding mechanism.

Fig. 5(a) is an oblique view of the first folding mechanism 50 in a state in which the front flap 51 is moving rightward from the start position of the reciprocating movement, and fig. 5(B) is a left side view thereof.

Fig. 6(a) is an oblique view of the first folding mechanism 50 in a state where the front flap 51 is moving halfway to the left toward the start position of the reciprocal movement, and fig. 6(B) is a left side view thereof.

Fig. 7 is an oblique view of the clamping mechanism.

Fig. 8 is an oblique view of the support frame.

Fig. 9 is an oblique view of the third fold back mechanism.

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

Fig. 11 is a plan view of the cloth presser foot for holding the body cloth and the front fly cloth.

Fig. 12 is a plan view of the cloth presser foot after the first and second stitches are formed.

Fig. 13 is a plan view of the cloth presser foot after the folding of the front fly cloth by the first folding mechanism.

Fig. 14 is a top view of the cloth presser foot after the first folding loop stitch is formed.

Fig. 15 is a plan view of the cloth presser foot after the folding of the front fly cloth by the second folding mechanism.

Fig. 16 is a top view of the cloth presser foot after the second fold loop is formed.

Fig. 17 is a plan view of the cloth presser foot after the folding of the front fly cloth by the third folding mechanism.

Fig. 18 is a plan view of the cloth presser foot after the slit is formed by the cutter mechanism.

FIG. 19 is a flowchart showing an operation of sewing a front fly.

Fig. 20 is a perspective view showing a sewing machine according to a second embodiment.

Fig. 21 is a perspective view showing a hemming presser foot member of the sewing machine according to the second embodiment.

Fig. 22 is an oblique view of a conventional sewing machine.

Fig. 23(a) to 23(F) are explanatory views showing steps of sewing a front fly by a conventional sewing machine.

Description of the reference numerals

10. 10B sewing machine

12-stitch needle

15 Sewing machine motor

21 lower plate

22 upper plate

30 cloth moving mechanism

33X-axis motor

34Y-axis motor

40 cutter mechanism

50 first folding mechanism

51 front fly flap

52 support mechanism

53 supplementary presser foot board

54 helical spring

55 air cylinder (actuator)

56 cam mechanism

57 linkage mechanism

60 second folding mechanism

61 air jet nozzle (air supply mechanism)

65 third folding mechanism

66 presser foot frame (front fly cloth presser foot)

67 air jet nozzle (air supply mechanism)

68 Cylinder (actuator)

80 holding mechanism

90 control device

221 slot

561 boss

562 cam plate

562a cam part

571 connecting rod

571a locking part

572 abutting part

573 abutment

574 left stopper

575 right stopper

c cutting seam

K cloth

N cloth

n1 first trace

n11 first folded trace

n12 second folded trace

n2 second trace

Detailed Description

[ first embodiment ]

A first embodiment of a sewing machine according to the present invention will be described in detail below with reference to the accompanying drawings. In the present embodiment, a sewing machine suitable for sewing the body fabric K on the front side of the front fly fabric N will be described.

[ Sewing procedure ]

First, a sewing process when the front fly fabric N is sewn to the body fabric K will be described with reference to fig. 1(a) to 1 (I).

First, a body fabric K on the front side is prepared (fig. 1 a), and a front fly fabric N is arranged to overlap the chest of the body fabric K (fig. 1B).

Next, the first and second stitches N1, N2 are formed in the range from the upper end portion of the front fly fabric N to the vicinity of the lower end portion (fig. 1C). In fig. 1(C), the lower ends of the first and second traces n1, n2 are shown as being close to each other, but actually the first trace n1 and the second trace n2 are formed in parallel with a slight gap therebetween. The second trace n2 may be formed by forming the first trace n1 to face downward and then folding back upward.

Next, the left end portion of the front fly fabric N is folded back along the first stitch N1 (fig. 1(D)), and a first folded back stitch N11 is formed for the folded back front fly fabric N so as to pass between the first stitch N1 and the second stitch N2 (fig. 1 (E)).

The left end of the front fly fabric N is folded back along the first folding loop stitch N11, and the right end of the front fly fabric N is folded back along the second stitch N2 (fig. 1F). Also, the second folded loop trace n12 is formed in such a manner as to pass between the second trace n2 and the first folded loop trace n11 (fig. 1 (G)).

Next, the right end of the front fly fabric N is folded back along the second folding stitch N12 (fig. 1H), and a slit c is formed between the first folding loop stitch N11 and the second folding loop stitch N12 with respect to the body fabric K and the front fly fabric N. The slit c is formed in a range from the upper end to the vicinity of the lower end of the fly fabric N (fig. 1 (I)).

Then, the front fly is formed on the body fabric K by folding back the portions of the front fly fabric N on both sides of the slit c toward the back side of the body fabric K, folding the portions of the front fly fabric N on both sides of the slit c in a rectangular shape, and sewing the portions of the front fly fabric N folded in a rectangular shape to the body fabric K along both sides of the slit c.

The sewing machine 10 described below executes the steps shown in fig. 1(a) to 1 (I).

[ general Structure of Sewing machine ]

As shown in fig. 2, the sewing machine 10 includes: a cloth presser foot 20 that holds a body cloth K and a front fly cloth N; a table 11 on which a body fabric K is placed during sewing; a cloth moving mechanism 30 for moving the cloth K freely along the upper surface of the table 11; a needle up-and-down moving mechanism, not shown, for dropping a needle to the body fabric K and the front fly fabric N held by the fabric presser foot 20; a cutter mechanism 40 for forming a slit in a direction along which the body fabric K and the front fly fabric N held by the fabric presser foot 20 are fixed; first to

third folding mechanisms

50, 60, 65 which fold back the front fly fabric N; a holding mechanism 80 supported on the cloth moving mechanism 30 side and pressing the front fly cloth N at the time of sewing and cutting; a control device 90 for controlling the operations of the above-described respective configurations; and a sewing machine frame 100 for supporting the above parts.

The sewing machine 10 further includes a kettle mechanism, a thread adjusting device, a thread balance, and the like, but these components are the same as those of the known components, and therefore, the description thereof is omitted.

[ Sewing machine frame ]

As shown in fig. 2, the sewing machine frame 100 includes: a base portion 101 located on the lower side; a vertical body section 102 that rises vertically upward from one end of the base section 101; and an arm portion 103 that protrudes in the horizontal direction from the longitudinal body portion 102.

In the following description, a direction along the longitudinal direction of the arm 103 is referred to as a Y-axis direction, a direction in which the needle moves up and down is referred to as a Z-axis direction, and a direction orthogonal to the Y-axis direction and the Z-axis direction is referred to as an X-axis direction. The Z-axis direction is parallel to the vertical up-down direction, and the Y-axis direction and the X-axis direction are both horizontal directions.

The description will be made with the face 104 side of the tip of the arm 103 being the front side and the opposite side being the rear side, and with the line of sight directed rearward, the left-hand side being the left side and the right-hand side being the right side, as necessary.

[ working tables ]

The table 11 is a rectangular flat plate, and is mounted on the base 101 so that the upper surface thereof is horizontal. The table 11 is disposed below the sewing needle supported by the sewing needle vertical movement mechanism, and the sewing object such as the body fabric K is placed on the upper surface thereof to perform sewing. Therefore, a needle drop hole into which the sewing needle enters is formed at the needle drop position of the table 11.

In addition, a toggle clamp 14 is provided at one end of the table 11.

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

The needle up-and-down moving mechanism comprises: a sewing machine motor 15 housed inside the sewing machine frame 100 (see fig. 10); an upper shaft that rotates using the sewing machine motor 15 as a drive source; a crank mechanism for converting the torque obtained from the upper shaft into an up-and-down reciprocating motion; and a needle bar which holds the sewing needle at the lower end part and reciprocates up and down by a crank mechanism.

Since the needle vertical movement mechanism having these structures is conventionally known, a detailed description thereof is omitted.

[ cloth presser foot ]

As shown in fig. 3, the cloth presser foot 20 includes a rectangular lower plate 21 and an upper plate 22 having substantially the same size. One end portion of the upper plate 22 is rotatably connected to one end portion of the lower plate 21 via hinges 222, and the body cloth K can be held between the upper plate 22 and the lower plate 21. In addition, a handle 223 is provided at the other end portion of the upper plate 22, and the handle 223 is used for raising and lowering the upper plate 22 with respect to the lower plate 21.

Two boss-shaped

projections

212 and 212 are fixedly provided on the upper surface of one end portion of the lower plate 21, and the

projections

212 and 212 are used to detachably hold the cloth presser foot 20 by a clamping mechanism 35 described later.

The cloth presser foot 20 is supported by the cloth moving mechanism 30 such that the longitudinal direction of the lower plate 21 and the upper plate 22 is parallel to the Y-axis direction in a state where the upper plate 22 is closed.

Further, long holes 221 are formed in the width direction of the lower plate 21 and the upper plate 22 in the center portions thereof so as to penetrate the plate surfaces (the long holes of the lower plate 21 are not shown). The long holes 221 of the lower plate 21 and the upper plate 22 have the same length and width, and the positions of the long holes coincide with each other in a state where the lower plate 21 and the upper plate 22 are overlapped. When the front fly fabric N is sewn, stitches and slits are formed inside the long holes 221.

A substantially rectangular recess 224 is formed around the elongated hole 221 in the upper surface of the upper plate 22, and the thickness of the upper plate 22 inside the recess 224 is reduced. Inside the concave portion 224, a front flap 51 of a first folding mechanism 50 described later is disposed in parallel with the long hole 221. The front flap 51 moves in the X-axis direction under the front fly fabric N during sewing, but is disposed inside the concave portion 224, and therefore can move without being caught by the front fly fabric N.

[ first folding mechanism ]

As shown in fig. 3, the first folding mechanism 50 includes: a front flap 51 that reciprocates in the X-axis direction so as to traverse a slit forming position (long hole 221) of the front flap cloth N; a support mechanism 52 that supports the front flap 51 so as to be movable back and forth; an auxiliary presser foot plate 53 disposed opposite the front flap plate 51 located at the start position of the reciprocating movement, across a slit forming position (elongated hole 221) by the cutter mechanism 40; a coil spring 54 that returns the front flap 51 to a reciprocating start position; and an air cylinder 55 (see fig. 8) as an actuator for moving the front flap 51 against the coil spring 54.

The first folding mechanism 50 is supported by the upper plate 22 of the cloth presser foot 20 except for the air cylinder 55, and only the air cylinder 55 is supported by the support frame 32 of the cloth moving mechanism 30 described later.

The front flap 51 is a flat plate elongated in the Y-axis direction, and a position on the left side near the long hole 221 is set as a start position of the reciprocation.

The front flap 51 has a length in the Y-axis direction approximately equal to that of the long hole 221, and can fold the front flap fabric N over substantially the entire length.

The auxiliary presser foot plate 53 is a long flat plate extending in the Y-axis direction, and the position on the right side near the long hole 221 is set as the initial position.

The auxiliary presser foot plate 53 has a length in the Y-axis direction approximately equal to that of the long hole 221, and can press the front fly fabric N over substantially the entire length.

The auxiliary presser foot plate 53 is supported by a second movable body 523 of a support mechanism 52 described later so as to be tiltable around the Y axis, and has a presser foot surface of the front fly fabric N at a position eccentric to the left side of the center of the tilting axis of the second movable body 523. The auxiliary presser foot plate 53 is provided with two magnets 531 at positions eccentric to the left side of the center of the tilt axis of the second movable body 523.

The upper plate 22 is formed of a magnet, for example, steel, and the auxiliary presser foot plate 53 is configured to be lifted toward the upper plate 22 by the attraction force of the two magnets 531, and to be capable of applying a holding pressure to the front fly cloth N on the upper plate 22.

The support mechanism 52 includes: a holding frame 521 for fixedly holding the front flap 51; a first movable body 522 supporting the holding frame 521 to be able to lift around the Y axis; a second movable body 523 that supports the auxiliary presser foot plate 53 so as to be tiltable around the Y axis; a slide rail 524 that guides the first movable body 522 and the second movable body 523 to be movable in the X-axis direction: a cam mechanism 56 for adjusting the height of the front flap plate 51 in accordance with the direction of reciprocation of the front flap plate 51; and a link mechanism 57 that reciprocates the auxiliary foot pressing plate 53 in conjunction with the front flap plate 51.

The holding frame 521 is supported by the first movable body 522 so as to be movable about the Y axis, and holds the front flap 51 at a position eccentric to the left side of the center of the lifting axis of the first movable body 522. Therefore, the front flap 51 can move up and down to approach or separate from the upper surface of the upper plate 22 by the holding frame 521 being lifted relative to the first movable body 522.

Fig. 4 is an enlarged oblique view of the periphery of the support mechanism 52. As shown in the drawing, the first movable body 522 includes a plate-shaped standing plate portion 522a at its left end portion, and one end portion of the coil spring 54 is connected to the standing plate portion 522a, and the coil spring 54 applies a tension to the first movable body 522 in the left direction.

Further, a semicircular notch 522b that opens upward is formed in the upper end portion of the upright plate portion 522 a. The plunger of the cylinder 55, which projects rightward, can be coupled to the notch 522b by fitting it into the notch from above.

Fig. 5(a) is an oblique view of the first folding mechanism 50 in a state in which the front flap plate 51 is halfway moved rightward from the start position of the reciprocal movement, fig. 5(B) is a left side view thereof, fig. 6(a) is an oblique view of the first folding mechanism 50 in a state in which the front flap plate 51 is halfway moved leftward from the start position of the reciprocal movement, and fig. 6(B) is a left side view thereof.

As shown in fig. 4 to 6, the cam mechanism 56 includes: a boss 561 serving as a follower of a cam provided in the holding frame 521; a cam plate 562 having a cam surface that is in sliding contact with the boss 561; and a spring 563 that biases the cam plate 562 in a predetermined direction.

The boss 561 is a round bar-shaped protrusion protruding forward from the front surface of the holding frame 521, and is provided leftward with respect to the center axis of the lifting of the holding frame 521. Since the front flap 51 is also fixedly supported on the left with respect to the central axis of the holding frame 521, if the boss 561 is pressed upward or downward from the cam plate 562, the front flap 51 is also pressed upward or downward in conjunction with the above.

Cam plate 562 is supported on upper plate 22 at one end by support bracket 564 so as to be rotatable about the Y axis, and projects rightward from the supported end.

The cam plate 562 includes a cam portion 562a, an upper surface and a lower surface of the cam portion 562a are cam surfaces that are in sliding contact with the boss 561, and the cam portion 562a extends in the X-axis direction. The cam portion 562a is positioned rightward from the position of the boss 561 when the front flap 51 is positioned at the start position of the reciprocation.

The cam plate 562 includes a boss portion 562b, one end of a spring 563 is connected to the boss portion 562b, and a tension is applied in a downward direction to the cam plate 562 and a right end of the cam portion 562 a.

Thus, the upper surface and the lower surface of the cam portion 562a are maintained in an inclined state in which the upper surface and the lower surface are lowered from the left end portion toward the right end portion.

The left end of the cam portion 562a in this inclined state is higher than the boss 561, and if the boss 561 moves rightward from the reciprocation start position on the left side of the cam portion 562a, it comes into sliding contact with the lower surface side of the cam portion 562 a. Therefore, the front flap 51 moves rightward while receiving a downward pressing force from the spring 563 via the boss 561 and the cam plate 562.

The right end of the cam portion 562a is lower than the boss 561, and if the boss 561 moves leftward from the right side of the cam portion 562a toward the start position of the reciprocation, the boss slides on the upper surface of the cam portion 562 a. Therefore, the front flap 51 moves leftward while being lifted upward by following the upper surface of the cam portion 562a inclined upward leftward via the boss 561 and the cam plate 562.

As shown in fig. 3 and 4, the link mechanism 57 includes: a connecting rod 571 that protrudes rightward from the first movable body 522; first and

second contact portions

572 and 573 provided to the second movable body 523; and a left stopper 574 and a right stopper 575 which limit the movable range of the second movable body 523.

The connecting rod 571 is a long plate in the left-right direction, and is fixedly supported at the left end portion by the first movable body 522. The right end of the connecting rod 571 is provided with a plate-shaped locking portion 571a bent downward.

Each of the first and

second contact portions

572, 573 is a flat plate provided upright on the upper portion of the second movable body 523, the first contact portion 572 is disposed at the right end portion of the second movable body 523, and the second contact portion 573 is disposed at the left end portion. The first contact portion 572 and the second contact portion 573 are disposed on the same line in the X-axis direction.

The locking portion 571a of the connecting rod 571 is disposed between the first contact portion 572 and the second contact portion 573.

Therefore, if the first movable body 522 starts moving rightward from the position of starting the reciprocating movement, only the first movable body 522 moves rightward until the locking portion 571a of the connecting rod 571 reaches the first contact portion 572, and if the locking portion 571a reaches the first contact portion 572, the second movable body 523 is pressed by the connecting rod 571 and also moves rightward together with the first movable body 522.

Further, if the first movable body 522 starts moving leftward toward the position of starting the reciprocal movement, the locking portion 571a of the connecting rod 571 is separated from the first contact portion 572 until it reaches the second contact portion 573, and only the first movable body 522 moves leftward, and if the locking portion 571a reaches the second contact portion 573, the second movable body 523 is pressed by the connecting rod 571 and also moves leftward together with the first movable body 522.

The left stopper 574 is disposed on the left side of the second movable body 523, and the second movable body 523 abuts the left stopper 574 to stop further movement to the left. That is, the left stopper 574 defines the left end position of the movable range of the second movable body 523.

If the left movement of the second movable body 523 is stopped by the left stopper 574, the left movement of the first movable body 522 interlocked by the interlocking mechanism 57 is also stopped. That is, the left stopper 574 can be said to define the left end position of the movable range of the first movable body 522.

When the first movable body 522 is located at the left end position of the movable range defined by the left stopper 574, the front flap 51 is set to be at the "start position of reciprocation".

When the second movable body 523 is located at the left end position of the movable range defined by the left stopper 574, the auxiliary presser foot plate 53 is set to be at the "initial position" located in the vicinity of the right side of the long hole 221.

The right stopper 575 is disposed on the right side of the second movable body 523, and the second movable body 523 abuts the right stopper 575 to stop further movement in the right direction. That is, the right stopper 575 defines the right end position of the movable range of the second movable body 523.

If the right movement of the second movable body 523 is stopped by the right stopper 575, the right movement of the first movable body 522 linked by the link mechanism 57 is also stopped. That is, the right stopper 575 may define the right end position of the movable range of the first movable body 522.

The air cylinder 55 is supported on the left side of the first movable body 522 by a later-described arm 321 of the support frame 32 of the cloth transfer mechanism 30 in a state where the plunger projecting direction is directed to the right side (see fig. 7).

Two flanges are formed in the plunger array of the cylinder 55, and are used when the plunger is connected to the semicircular notch 522b formed in the vertical plate portion 522a of the first movable body 522. That is, when the plunger is fitted and coupled to the semicircular notch 522b, the vertical plate portion 522a is sandwiched by the two flanges, whereby the movement of the plunger in the advancing and retreating movement direction can be transmitted to the first movable body 522.

As described above, the upright plate portion 522a of the first movable body 522 and the plunger of the cylinder 55 are configured to be extremely easily coupled and detachable

The reason why the air cylinder 55 is not supported by the cloth presser foot 20 is that the cloth presser foot 20 is detachably held from the base 31 of the cloth moving mechanism 30 described later. That is, if the air cylinder 55 is supported on the cloth presser foot 20 side, when attaching and detaching the cloth presser foot 20 to and from the base 31, it is necessary to attach and detach an air hose for supplying high-pressure air to and from the air cylinder 55, and the attaching and detaching operation of the cloth presser foot 20 becomes complicated. On the other hand, in the case of the structure in which the cylinder 55 is supported by the cloth moving mechanism 30, the plunger of the cylinder 55 and the first movable body 522 need to be detachable, and as described above, the structure in which these are detachable easily is required.

[ cloth moving mechanism ]

As shown in fig. 2, the cloth moving mechanism 30 includes: a base 31 for supporting the cloth presser foot 20; a support frame 32 that supports various structures described later; and an X-axis motor 33 and a Y-axis motor 34 (see fig. 10) as drive sources for moving the base 31 along the horizontal plane.

The base 31 is supported by a linear guide (not shown) which is accommodated in the base portion 101 and guides the base in the X-axis direction and a linear guide (not shown) which guides the base in the Y-axis direction so as to be movable to an arbitrary position on a horizontal plane. The base 31 is moved by a transmission mechanism (not shown) that converts rotational force of the X-axis motor 33 and the Y-axis motor 34 as drive sources into reciprocating force in the X-axis direction and the Y-axis direction. As the transmission mechanism, a known transmission mechanism such as a belt mechanism, a ball screw mechanism, or a rack and pinion mechanism can be used.

The base 31 is fixedly provided with a clamp mechanism 35 for detachably holding the cloth presser foot 20. As shown in fig. 7, the clamping mechanism 35 includes: a support plate 351 having

recesses

352 and 352 formed therein, which are fitted to the two boss-shaped

protrusions

212 and 212 of the cloth presser foot 20; clamping members 353, which are formed with claws for holding so that the

projections

212, 212 of the cloth presser foot 20 jogged with the

recesses

352, 352 do not fall off; and

cylinders

354, 354 that switch between a holding state and a releasing state of the

bosses

212, 212 by the clamping

members

353, 353.

When the

protrusions

212 and 212 of the cloth presser foot 20 are fitted into the

recesses

352 and 352 of the support plate 351, the clamp mechanism 35 is rotated in the direction in which the

clamp members

353 and 353 are held by the driving of the

cylinders

354 and 354. Thereby, the

protrusions

212 and 212 are sandwiched by the recesses 352 and the clamping

members

353 and 353, and the cloth presser foot 20 is fixed to the base 31.

When the cloth presser foot 20 is separated, the

air cylinders

354 and 354 rotate to the opposite side to the case where the clamping

members

353 and 353 hold the cloth presser foot. Accordingly, the structure for holding the

protrusions

212 and 212 inside the

recesses

352 and 352 is eliminated, and the cloth presser foot 20 can be separated from the base 31.

As shown in fig. 8, the support frame 32 supports the air cylinder 55, the second folding mechanism 60, and the holding mechanism 80 of the first folding mechanism 50.

The support frame 32 is fixedly mounted on the front end portion of the base 31 and is positioned above the cloth presser foot 20 held by the clamp mechanism 35.

The support frame 32 includes two

arm portions

321 and 322 extending forward in the Y-axis direction from both ends in the X-axis direction.

The air cylinder 55 of the first folding mechanism 50 is supported by the support frame 32 at the tip of the arm 321 on one side (left side).

The second folding mechanism 60 described later is supported on the other (right) arm portion 322.

The holding mechanism 80 is supported between the two

wrist portions

321 and 322.

[ holding mechanism ]

As shown in fig. 8, the holding mechanism 80 includes: two front fly

presser foot plates

81, 81 which press and hold the front fly cloth N from above in the vicinity of both right and left sides of the long hole 221 of the cloth presser foot 20 mounted on the clamping mechanism 35;

support members

82, 82 that individually support the respective front

flap foot plates

81, 81; and

cylinders

83, 83 which individually raise and lower the front

fly presser plates

81, 81 via the

support members

82, 82.

The two front

fly presser plates

81, 81 are long, have the same length as the long hole 221, and are arranged parallel to the long hole 221.

Further, since the front fly fabric N is pressed and held from above in the vicinity of both the right and left sides of the long hole 221, the front fly fabric N is suppressed from vibrating up and down as the sewing needle moves up and down at the time of sewing, and excellent sewing can be performed.

The

presser foot plates

81, 81 hold the front fly cloth N only when the needle is dropped by the needle vertical movement mechanism and when the cutting is formed by the cutter mechanism 40, and otherwise control the

cylinders

83, 83 to retreat upward so as not to hinder the folding operation of the front fly cloth N.

The

support members

82 and 82 are so-called cranks, and are given rotational motion by

cylinders

83 and 83.

The

support members

82, 82 are rotated to raise and lower the front door

flap leg plates

81, 81.

[ second folding mechanism ]

As shown in fig. 8, the second folding mechanism 60 is an air blowing mechanism that folds the end portion of the front fly fabric N folded rightward by the first folding mechanism 50 further to the left side.

The second folding mechanism 60 includes two

air discharge nozzles

61, 61 as air blowing mechanisms, and support bodies 62, 62 for supporting the

air discharge nozzles

61, 61. Each of the air ejection nozzles 61 and 61 is cylindrical and is disposed on the right side of the elongated hole 221 of the cloth presser foot 20 in the Y-axis direction. Each of the air ejection nozzles 61 and 61 is provided with a plurality of air ejection ports (not shown) along the longitudinal direction thereof, and air is ejected toward the left side over the entire width of the front fly fabric N in the Y-axis direction, so that the end portion of the front fly fabric N folded to the right side by the first folding mechanism 50 can be folded further toward the left side.

Further, if the second folding mechanism 60 is also supported on the cloth presser foot 20 side, when the cloth presser foot 20 is attached to and detached from the base 31, it is necessary to attach and detach the air hose for supplying high-pressure air to and from each of the

air discharge nozzles

61 and 61, and the attachment and detachment work of the cloth presser foot 20 becomes complicated.

Therefore, the second folding mechanism 60 is also provided in the support frame 32, thereby facilitating the work of attaching and detaching the cloth presser foot 20.

[ third folding mechanism ]

As shown in fig. 2 and 9, the third folding mechanism 65 includes: a presser foot frame 66 (see fig. 17) as a front fly cloth presser foot for pressing the front fly cloth N from above on the left side of the long hole 221 of the cloth presser foot 20;

air blowing nozzles

67, 67 as air blowing means housed inside the presser foot frame 66; a cylinder 68 for lifting the presser foot frame 66; and a support bracket 69 for supporting the cylinder 68, the support bracket 69 being screwed to the surface 104 of the sewing machine frame 100.

The cylinder 68 is supported by the support bracket 69 at the right end of the face portion 104 with the plunger facing downward.

A presser foot frame 66 is provided at the lower end of the plunger, and the presser foot pressure of the front fly cloth N is obtained by the bulging pressure of the cylinder 68.

The presser foot frame 66 is a rectangular frame body along the Y-axis direction, and has left and right side surfaces that are largely open. The front fly fabric N can be pressed by the bottom surface portion of the presser frame 66.

Two air ejection nozzles 67, 67 are accommodated inside the presser foot frame 66. These air ejection nozzles 67, 67 are both cylindrical and are disposed inside the presser foot frame 66 in the Y-axis direction. Each of the

air discharge nozzles

67, 67 has a plurality of air discharge ports (not shown) along the longitudinal direction thereof, and each of the air discharge ports discharges air to the right (see fig. 17).

According to the above configuration, the third folding mechanism 65 can press the right end portion of the front fly cloth material N by the presser foot frame 66, and fold the right end portion of the front fly cloth material N to the right side by the air of the air ejection nozzles 67, 67.

[ cutter mechanism ]

As shown in fig. 2, the cutter mechanism 40 includes a not-shown cutter having a blade at a lower end portion thereof, and a driving mechanism for reciprocating the cutter up and down.

The cutter is disposed adjacent to the left side of the sewing needle, and forms a cutting seam c on the front fly cloth N and the body cloth K when the cutter descends.

The drive mechanism includes a cutter drive motor 41 (see fig. 10) and a conversion mechanism such as a crank mechanism for converting the torque of the cutter drive motor 41 into an up-and-down reciprocating motion. The driving source of the cutter driving mechanism may be an air cylinder.

When the front fly fabric N and the body fabric K are slit, the long hole 221 of the fabric presser foot 20 is moved downward of the cutter, and the cutter is moved upward and downward while the fabric presser foot 20 is moved in the Y-axis direction, whereby the slit c in the Y-axis direction is formed in the front fly fabric N and the body fabric K.

[ control system for sewing machine: control device

Fig. 10 is a block diagram showing a control system of the sewing machine 10. The control device 90 of the sewing machine 10 includes: a rom (read Only memory)92 that stores a program for executing motion control in sewing; a ram (random Access memory)93 serving as an operation area for arithmetic processing; an erasable nonvolatile data memory 94 as a storage unit for storing various data such as stitch data; and a CPU 91(Central Processing Unit) that executes the program in the ROM 92.

The CPU 91 is connected to the sewing machine motor drive circuit 15a, the X-axis motor drive circuit 33a, the Y-axis motor drive circuit 34a, and the cutter drive motor drive circuit 41a via interfaces not shown, and controls the drive of the sewing machine motor 15, the X-axis motor 33, the Y-axis motor 34, and the cutter drive motor 41 via these circuits.

The CPU 91 is connected to driving

circuits

55b, 61b, 68b, 67b, 354b, and 83b for controlling the

solenoid valves

55a, 61a, 68a, 67a, 354a, and 83a for operating the air cylinder 55 of the first folding mechanism 50, the air discharge nozzle 61 of the second folding mechanism 60, the air cylinder 68 of the third folding mechanism 65, the air discharge nozzle 67 of the third folding mechanism 65, the air cylinder 354 of the clamp mechanism 35, and the air cylinder 83 of the holding mechanism 80, respectively, via an interface not shown.

In the sewing machine 10, the air discharge nozzle 61 of the second folding mechanism 60, the air discharge nozzle 67 of the third folding mechanism 65, the air cylinder 354 of the clamp mechanism 35, the air cylinder 83 of the holding mechanism 80, the

solenoid valves

61a, 67a, 354a, 83a thereof, and the

drive circuits

61b, 354b, 83b thereof are provided in two numbers, respectively, but only one is illustrated in fig. 10.

The data memory 94 stores cloth feed data defining the amount of feed of the cloth by the X-axis motor 33 and the Y-axis motor 34 for moving the cloth presser foot 20 to form the stitches n1 and n2, the folded stitches n11 and n12, and the slit c described later, and the rotation number of the sewing machine motor 15 and the cutter driving motor 41, and the CPU 91 reads the set contents of the data for each stitch at the time of sewing, and controls the operation of each structure of the sewing machine.

A pedal switch 95 for performing a sewing operation is attached to the control device 90.

[ Sewing action of front fly ]

The operation of sewing the front fly by the sewing machine 10 will be described based on the operation explanatory diagrams of fig. 11 to 18 and the flowchart of fig. 19.

In the operation explanatory diagrams of fig. 11 to 18, the holding mechanism 80 and the support frame 32 are not shown.

First, as a setting operation before starting sewing, the upper plate 22 of the cloth presser foot 20 in a state separated from the sewing machine 10 is opened, and the body cloth K is disposed at a predetermined position on the upper surface of the lower plate 21. Subsequently, the upper plate 22 is closed, and the body cloth K is held.

Further, since the front flap 51 and the auxiliary presser foot plate 53 on the upper plate 22 are maintained at the start position and the initial position of the reciprocating movement by coil springs, respectively, the auxiliary presser foot plate 53 is lifted against the magnet 531, the front flap fabric N is disposed so that the predetermined position of the stitch formation coincides with the position of the long hole 221, and the auxiliary presser foot plate 53 is lowered. At this time, the front fly fabric N is disposed so that the front fly flap 51 is hidden under the front fly fabric N.

Then, the two

protrusions

212 and 212 of the cloth presser foot 20 are fitted into the

recesses

352 and 352 of the support plate 351 of the clamping mechanism 35, and the cylinder 55 of the first folding mechanism 50 is coupled to the first movable body 522.

First, the cylinder 55 of the first folding mechanism 50 retracts the plunger, and the plunger is coupled to the semicircular notch 522b formed in the first movable body 522 of the support mechanism 52.

Then, if the pedal switch 95 is pressed, the CPU 91 operates the

air cylinders

354 and 354 via the

solenoid valves

354a and 354a to hold the

bosses

212 and 212 by the clamp members 353 and 353 (step S1).

Next, if the pedal switch 95 is pressed, the CPU 91 operates the

cylinders

83 and 83 via the

electromagnetic valves

83a and 83a, lowers the front

fly presser plates

81 and 81, and holds the front fly fabric N on both the right and left sides of the long hole 221 (step S3).

Then, if the pedal switch 95 is pressed, the CPU 91 controls the X-axis motor 33 and the Y-axis motor 34 to move the cloth presser foot 20 so that the sewing start position near the center portion in the X-axis direction of the rear end portion of the front fly cloth N held by the cloth presser foot 20 is below the sewing needle (step S5, fig. 11).

Next, the CPU 91 starts driving of the sewing machine motor 15 and controls the X-axis motor 33 and the Y-axis motor 34 to form a first stitch n1 and a second stitch n2 (step S7, fig. 12, [ first sewing control ]).

Next, the CPU 91 raises the front flap

presser foot plates

81 and 81 by the

cylinders

83 and 83 to release the front flap cloth N (step S9).

Then, the CPU 91 operates the air cylinder 55 via the solenoid valve 55a, and moves the front flap 51 located at the start position of the reciprocation in the direction (rightward) crossing the long hole 221 against the coil spring 54. Thus, the left end portion of the front fly fabric N is folded back to the right side with the first stitch N1 as a fold. The front door flap 51 also moves the auxiliary presser foot plate 53 to the right side by the link mechanism 57, and is stopped at the right end of each movable range by the right stopper 575. Both the front fly flap 51 and the auxiliary presser foot plate 53 are stopped at a position separated rightward from the front fly fabric N (step S11, fig. 13, [ first folding control ]).

When the front flap 51 moves rightward, the boss 561 of the holding frame 521 slides on the lower surface of the cam portion 562a of the cam plate 562 of the cam mechanism 56 and moves downward while being pressed (see fig. 5a and 5B). This enables the front fly fabric N to be reliably folded along the first stitch N1.

Next, the CPU 91 again lowers the front flap

presser foot plates

81 and 81 by the

cylinders

83 and 83 to hold the front flap cloth N (step S13).

Then, the CPU 91 controls the sewing machine motor 15, the X-axis motor 33, and the Y-axis motor 34 to form the first folded-back stitch n11 between the first stitch n1 and the position (predetermined position) where the slit of the cutter mechanism 40 is formed (step S15, fig. 14, [ second sewing control ]).

Next, the CPU 91 raises the front flap

presser foot plates

81 and 81 by the

cylinders

83 and 83 to release the front flap cloth N (step S17).

The CPU 91 controls the electromagnetic valve 61a to discharge air to the left from the

air discharge nozzles

61 and 61 of the second folding mechanism 60, folds the left end portion of the front fly fabric N to the left with the first folded stitch N11 as a fold, and folds the right end portion of the front fly fabric N to the left with the second stitch N2 as a fold (step S19).

Then, the CPU 91 retracts the plunger of the cylinder 55 to return the front flap 51 located at the folded-back position to the starting position of the reciprocating movement (step S21, fig. 15, [ second folding control ]). The front flap 51 also moves the auxiliary presser foot plate 53 to the left side by the link mechanism 57, and stops at the left end of each movable range, that is, the start position and the initial position of the reciprocation, by the left stopper 574.

When the front flap 51 moves leftward, the boss 561 of the holding frame 521 slides on the upper surface of the cam portion 562a of the cam plate 562 of the cam mechanism 56 and moves upward (see fig. 6 a and 6B). Thus, the front fly fabric N can be pressed with an appropriate presser foot pressure without being caught on the front fly fabric N that is laminated and thickened by being folded back a plurality of times.

Next, the CPU 91 again lowers the front flap

presser foot plates

81 and 81 by the

cylinders

83 and 83 to hold the front flap cloth N (step S23).

The CPU 91 controls the sewing machine motor 15, the X-axis motor 33, and the Y-axis motor 34 to form the second folded-back stitch n12 between the position where the slit is formed (the predetermined position for forming) of the cutter mechanism 40 and the second stitch n2 (step S25, fig. 16, [ third sewing control ]).

Next, the CPU 91 raises the front flap

presser foot plates

81 and 81 by the

cylinders

83 and 83 to release the front flap cloth N (step S27).

Then, the CPU 91 operates the air cylinder 55 via the electromagnetic valve 55a, and moves the front flap 51 and the auxiliary foot pressing plate 53 located at the start positions of the reciprocation again to the right end of the movable range. Thereby, both the front flap 51 and the auxiliary presser foot plate 53 are stopped at positions separated rightward from the front flap cloth N (step S29).

Next, the CPU 91 lowers the presser foot frame 66 of the third folding mechanism 65 by the air cylinder 68 to press the front fly fabric N from above. At this time, the cloth presser foot 20 is controlled to move by the cloth moving mechanism 30 so that the position between the left end portion of the front fly cloth material N folded to the left and the right end portion of the front fly cloth material N folded to the left becomes the descending position of the presser foot frame 66, and only the left end portion of the front fly cloth material N can be pressed by descending the presser foot frame 66.

Then, the CPU 91 controls the solenoid valve 67a to eject the air to the right from the air ejection nozzles 67, 67 of the third folding mechanism 65, and folds the right end of the front fly fabric N to the right with the second folding loop trace N12 as a fold (step S31, FIG. 17, [ third folding control ])

Next, the CPU 91 again lowers the front flap

presser foot plates

81 and 81 by the

cylinders

83 and 83 to hold the front flap cloth N (step S33).

The CPU 91 controls the X-axis motor 33 and the Y-axis motor 34 to move the cloth presser foot 20 downward of the cutter mechanism 40.

Then, the driving of the cutter driving motor 41 is started and the cloth presser foot 20 is fed in the Y-axis direction, and the slit c is formed between the first folding loop stitch n11 and the second folding loop stitch n12 (step S35, fig. 18, [ slit forming control ]).

Then, the CPU 91 raises the front flap

presser foot plates

81 and 81 by the

air cylinders

83 and 83 to release the front flap cloth N (step S37), releases the holding state of the

bosses

212 and 212 by the

clamp members

353 and 353 by the

air cylinders

354 and 354, and ends the sewing operation of the front flap (step S39).

[ technical effects ]

The sewing machine 10 includes: a first folding mechanism 50 that folds the front fly fabric N along a first stitch N1; and a second folding mechanism 60 that folds the front fly fabric N along the second stitch N2, so that the front fly can be sewn so that decorative lines (first and second folded stitches N11, N12) are formed near the respective folds, and the front fly can be sewn in a variety of colors.

In addition, since the sewing machine 10 can form a decorative thread by other processes or manual work, the sewing work can be performed quickly and efficiently.

Further, the control device 90 of the sewing machine 10 sequentially executes a first sewing control for controlling the cloth moving mechanism 30 and the needle up-and-down moving mechanism to form a first stitch N1 and a second stitch N2, a first folding control for controlling the first folding mechanism 50 to fold the front fly cloth N along the first stitch N1, a second sewing control for controlling the cloth moving mechanism 30 and the needle up-and-down moving mechanism, a first folding loop N11 formed between the first stitch N1 of the front fly cloth N folded back by the first folding mechanism 50 and a formation position (formation predetermined position) of the slit c by the cutter mechanism 40, a second folding control for controlling the second folding mechanism 60 to fold the front fly cloth N along the second stitch N2, and a third sewing control for controlling the cloth moving mechanism 30 and the needle up-and-down moving mechanism, a second folded-back stitch N12 is formed between the second stitch N2 of the front fly fabric N folded back by the second folding-back mechanism 60 and the position (predetermined position for forming) where the slit is formed by the cutter mechanism.

Thus, the sewing of the complicated front fly cloth can be performed more efficiently by a simple structure.

Further, the sewing machine 10 includes a third folding mechanism 65 for folding the front fly fabric N along the second folding stitch N12, the control device 90 sequentially executes a third folding control and a slit forming control, the third folding control controls the third folding mechanism 65 to fold the front fly fabric N along the second folding stitch N12, the slit forming control controls the cutter mechanism 40 to form a slit at a slit forming position (a predetermined forming position) of the body fabric K and the front fly fabric N, and therefore, after the second folding stitch N12 is formed, the front fly fabric N can be avoided without hindering the cutting operation when the slit c is formed by the cutter mechanism 40, and the sewing can be performed more efficiently without requiring a manual operation.

In addition, the first folding mechanism 50 of the sewing machine 10 includes: a front flap 51 that reciprocates by traversing a slit forming position by the cutter mechanism 40; an air cylinder 55 as an actuator serving as a driving source for at least one-side movement of the reciprocation of the front flap 51; and a support mechanism 52 for supporting the front flap 51 in a reciprocating manner, wherein the front flap 51 folds the front flap fabric N along the first stitch N1 by a movement of the plunger of the cylinder 55 in a direction of projecting rightward (a movement of going forward), and presses the front flap fabric N folded along the second stitch N2 from above by a movement of the plunger of the cylinder 55 in a direction of retreating leftward (a movement of going backward), and the support mechanism 52 has a cam mechanism 56 for moving the movement of going forward of the front flap 51 at a position lower than the movement of going backward.

Thus, even when the thickness varies due to the folding or the like of the front flap fabric N as the sewing progresses, the front flap 51 can be pressed against the front flap fabric N at an appropriate height and an appropriate pressing force, and the sewing can be performed satisfactorily.

The first folding mechanism 50 of the sewing machine 10 further includes an auxiliary presser foot plate 53, and the auxiliary presser foot plate 53 is disposed opposite to the front flap plate 51 located at the start position of the reciprocating movement with the slit forming position (predetermined forming position) by the cutter mechanism 40 interposed therebetween; the support mechanism 52 includes an interlocking mechanism 57, and the interlocking mechanism 57 reciprocates the auxiliary presser foot plate 53 in conjunction with the front flap plate 51 in a range in which a slit forming position (predetermined forming position) by the cutter mechanism 40 does not cross.

Thus, one cylinder 55 (actuator) can be switched to two states: a state in which the front flap 51 and the auxiliary presser foot plate 53 are separately arranged on both sides of a slit forming position (forming predetermined position); and a state in which both the front flap 51 and the auxiliary presser foot plate 53 are retracted to one side of the slit forming position (formation predetermined position), it is possible to achieve a reduction in manufacturing cost of the sewing machine due to a reduction in the number of components.

The second folding mechanism 60 of the sewing machine 10 has an air discharge nozzle 61 as an air blowing mechanism, and blows air toward the front fly material N.

Therefore, the folding operation of the front fly fabric N can be realized with a simple configuration, and the folding operation can be performed from a position separated from the front fly fabric N, so that the freedom of arrangement of the second folding mechanism 60 is high, and the design of the sewing machine 10 can be facilitated.

Further, since the air ejection nozzle 61 does not require a mechanical operation, maintenance work can be reduced and operational reliability can be improved.

Similarly, the third folding mechanism 65 includes: a presser foot frame 66 that presses the front fly fabric N from above by a lowering operation; and an air discharge nozzle 67 as an air blowing mechanism for blowing air to the front fly cloth N mounted on the presser foot frame 66, and therefore, the same effect as that of the second folding mechanism 60 can be obtained, and the pressing operation of the front fly cloth N by the presser foot frame 66 can be performed.

Further, since the entire structure of the third folding mechanism 65 can be retracted upward, the freedom of arrangement of the third folding mechanism 65 can be further increased.

Further, since the sewing machine 10 can attach and detach the cloth presser foot 20 to and from the base 31, it is not necessary to perform the work of attaching the body cloth K and the front fly cloth N to the cloth presser foot 20 in a narrow region around the sewing needle, and the workability can be improved.

In addition, damage caused by mechanisms around the sewing needle is avoided, and the cloth K of the clothes body and the cloth N of the front placket can be protected.

Further, since the air cylinder 55 for performing the folding operation of the first folding mechanism 50 is not supported by the cloth presser foot 20 but is supported by the base 31 via the support frame 32, the attaching and detaching operation of the air cylinder 55 and the air hose accompanying the attaching and detaching operation of the cloth presser foot 20 is not required, and the workability can be improved.

In addition, since the second folding mechanism 60 is supported by the base 31 via the support frame 32 without being supported by the cloth presser foot 20, the attaching and detaching operation of the air discharge nozzle 61 and the air hose of the second folding mechanism 60 in association with the attaching and detaching of the cloth presser foot 20 is not required, and the workability can be improved.

Further, since the third folding mechanism 65 is also provided on the surface portion 104 of the sewing machine frame 100, the attaching and detaching operation of the air cylinder 68, the air discharge nozzle 67, and the air hose is not required, and the workability can be improved.

[ second embodiment ]

A sewing machine 10B according to a second embodiment will be described with reference to fig. 20 and 21. The same configuration as that of the sewing machine 10 described above will be omitted from the sewing machine 10B, and points different from the sewing machine 10 will be described in detail.

As shown in fig. 20, the sewing machine 10B includes a hemming presser mechanism 110. The hemming presser mechanism 110 is controlled by the control device 90. The hemming presser mechanism 110 is supported by a cutter mechanism 40 provided at the front end of the arm 103 of the sewing machine 10B via a bracket 111. The hemming presser mechanism 110 includes a support plate 112 fixed to a bracket 111, and an air cylinder 113 is fixed to the support plate 112. The air cylinder 113 includes a rod 114, and the rod 114 is advanced and retreated by the supply of air. The rod 114 is fixed at its front end with a support 115. Further, a guide block 116 is fixed to the support plate 112, and the guide block 116 includes a guide rod 117, and the guide rod 117 is slidable along the rod 114 of the air cylinder 113. The front end of the guide bar 117 is fixed to the support 115. Thereby, the support 115 is supported without rotating about the axis of the rod 114. A support block 118 is fixed to the stay 115 by screw fastening, and a hemming leg member 121 is detachably provided on the support block 118.

As shown in fig. 21, the crimping leg member 121 includes: a fixed block portion 122 fixed to the support block 118; and a leg portion 123 supported at a lower end of the fixed block portion 122. The presser foot part 123 includes a guide plate part 124 and a presser foot plate part 125, and the guide plate part 124 and the presser foot plate part 125 are disposed adjacent to each other. The bottom surface of the guide plate portion 124 is disposed slightly below the bottom surface of the presser foot plate portion 125. The presser foot plate portion 125 is biased downward by a biasing member (not shown) such as a spring.

The hemming presser foot member 121 presses the front fly fabric N while guiding the folded hem portion d of the front fly fabric N. The guide plate portion 124 is disposed along the folded-back hem portion d at a position adjacent to the folded-back hem portion d separated from the folded-back front fly fabric N. The presser foot plate portion 125 is disposed adjacent to the folded hem portion d on the folded front fly fabric N, and presses the front fly fabric N from above. A gap G is provided between the guide plate portion 124 and the presser foot plate portion 125, a tubular cloth presser foot 12a is disposed in the gap G, and the cloth presser foot 12a is provided so as to surround the sewing needle 12 and the sewing needle 12 (see fig. 20).

The hemming presser mechanism 110 moves the rod 114 forward and backward by the air cylinder 113, and thereby the hemming presser member 121 moves between a hemming presser position, which is a vicinity of a sewing position where the front fly cloth N is sewn by the sewing needle 12 of the sewing needle vertical movement mechanism, and a retreat position away from the hemming presser position.

Then, if the rod 114 is extended by the cylinder 113 of the hem presser mechanism 110 and the hem presser member 121 is disposed at the hem presser position, the folded-back hem portion d of the front fly fabric N is guided by the guide plate portion 124, and the folded-back portion of the front fly fabric N is pressed by the presser plate portion 125. In this state, if the front fly fabric N is sewn by the sewing needle 12 of the needle vertical movement mechanism, the front fly fabric N is prevented from being lifted at the time of sewing, and the welt width W, which is the width between the folded hem portion d and the stitch, is maintained at a predetermined dimension.

Further, the position of the hemming presser mechanism 110 can be adjusted in the vertical direction, the horizontal direction, and the front-rear direction which is the extending direction of the arm 103 with respect to the arm 103, and the change of the welt width W, the thickness of the front fly fabric N, and the like can be accommodated by adjusting the position of the hemming presser mechanism 110.

Further, the hemming presser mechanism 110 can be changed by attaching and detaching the hemming presser member 121, and can cope with a change in the welt width W, the thickness of the front fly fabric N, and the like.

Next, the control of the hemming presser mechanism 110 by the CPU 91 of the control device 90 will be described.

The CPU 91 executes first sewing control of forming the first stitch N1 and the second stitch N2 (step S7 in fig. 19), and after executing first folding control of folding the left end portion of the front fly fabric N to the right side with the first stitch N1 as a fold (steps S9, S11 in fig. 19), executes second sewing control using the hemming presser mechanism 110 (steps S13, S15 in fig. 19).

In the second sewing control, the CPU 91 first lowers the front fly

presser foot plates

81 and 81 by the

air cylinders

83 and 83 to hold the front fly cloth N (step S13 in fig. 19).

Next, the CPU 91 extends the rod 114 of the cylinder 113 of the hemming presser mechanism 110 to dispose the hemming presser member 121 at the hem presser position at the retracted position. Then, the folded-back hem portion d of the front fly fabric N folded back in the first folding control is guided by the guide plate portion 124, and the folded-back portion of the front fly fabric N is pressed by the presser plate portion 125.

The CPU 91 controls the sewing machine motor 15, the X-axis motor 33, and the Y-axis motor 34 so that the first folded loop stitch N11 is formed between the first and second stitches N1 and N2, specifically, between the positions where the slit c is formed by the first stitch N1 and the cutter mechanism 40 in the front fly cloth N by the sewing needle 12 of the needle vertical moving mechanism in the gap G of the hemming presser foot member 121 (step S15 in fig. 19).

At this time, the presser plate portion 125 of the hemming presser member 121 suppresses the front fly material N from being lifted, and the guide plate portion 124 of the hemming presser member 121 maintains the welt width W, which is the width between the folded-back hem portion d and the first folded-back stitch N11, at a predetermined dimension.

As described above, according to the sewing machine 10B of the second embodiment, when sewing the vicinity of the folded-back hem portion d of the front fly fabric N folded back along the folded-back hem portion d, the folded-back hem portion d of the front fly fabric N can be pressed and guided by the hem presser mechanism 110 in the vicinity of the sewing site by the sewing needle 12 of the needle vertical movement mechanism. Thus, when the first folded-back stitch N11 is formed in the front fly fabric N, the welt width W, which is the width from the folded-back hem portion d to the first folded-back stitch N11, can be stably maintained at a predetermined dimension. This makes it possible to improve the quality of the finished product to be sewn.

[ others ]

In the sewing machine 10 or the sewing machine 10B, the order of the sewing steps can be changed as appropriate.

For example, the formation of the kerf c may also be performed before the formation of the stitches n1, n 2. The slit c may be formed after the stitches N1 and N2 are formed and before the front fly fabric N is folded back along the stitch N1.

Further, the air cylinder 55 as the actuator of the first folding mechanism 50 of the sewing machine 10 is a single-acting type air cylinder in which the plunger is projected by supplying air pressure and retreats by the tension of the coil spring 54, but a double-acting type air cylinder in which the plunger is projected and retreated by air pressure may be used.

Claims

1. A sewing machine is provided with:

the control device is used for controlling the operation of the motor,

the sewing machine is characterized by comprising:

a second folding mechanism for folding back the front fly fabric along the second trace,

the control device sequentially executes the following controls:

2. The sewing machine of claim 1,

the control device sequentially executes the following controls:

3. The sewing machine of claim 2,

4. The sewing machine according to any one of claims 1 to 3,

5. The sewing machine of claim 4,

6. The sewing machine according to any one of claims 1 to 3,

7. The sewing machine of claim 4,

8. Sewing machine as in claim 5,