JP2017192530A - sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sew various plackets.SOLUTION: A sewing machine includes: a cloth presser 20 which holds body cloth K and placket cloth N; a cloth movement mechanism 30 which arbitrarily moves the cloth presser along a flat surface on which the body cloth is placed; a needle vertical movement mechanism which locates a needle on the body cloth and the placket cloth held by the cloth presser; a knife mechanism 40 which forms a cut line in each of the body cloth and the placket cloth held by the cloth presser along a fixed direction; and a control device 90 which controls the cloth presser, the cloth movement mechanism, the needle vertical movement mechanism, and the knife mechanism. The control device controls the cloth movement mechanism and the needle vertical movement mechanism to form a first seam n1 and a second seam n2, and controls the knife mechanism to form a cut line c between the first seam and the second seam. The sewing machine further includes: a first folding mechanism 50 which folds back the placket cloth along the first seam; and a second folding mechanism 60 which folds back the placket cloth along the second seam.SELECTED DRAWING: Figure 15

Description

  The present invention relates to a sewing machine which performs placket sewing.

  As shown in FIG. 22, the conventional sewing machine 1000 that performs the sewing of the placket is a needle up-and-down moving mechanism that forms two seams downward from the collar with respect to the placket cloth N arranged at the neck of the body cloth K. 1100, a female mechanism 1200 that forms a cut along the seam between the two seams, and a cloth presser mechanism that presses the body cloth K and the front cloth N from above and moves them in the direction along the two seams. 1300 (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-110963

By the way, as shown in FIGS. 23 (A) and 23 (B), placket sewing is performed by placing a placket cloth N on the neck of the body cloth K to form two seams n1 and n2 (FIG. 23). (C)), a cut c is formed between the seams n1 and n2 (FIG. 23D), and the portions on both sides of the cut c of the front cloth N are folded inside the body cloth K (FIG. 23E). )), There is a step of folding and sewing each part into a rectangle (FIG. 23 (F)).
The placket sewing composed of this process is a simple basic sewing, and the conventional sewing machine performs only the formation of the two seams n1 and n2 and the formation of the cut c as shown in FIG. 23 (D). I could not.

However, in the case of placket sewing, there has been a high demand for forming more seams in various ways in addition to the basic type of sewing described above. For example, there is a demand for the sewing of the placket that forms the top stitch formed in the vicinity of each fold by folding the left and right sides of the placket cloth N with the stitches n1 and n2 as folds, respectively. Such sewing cannot be performed.
For this reason, the formation of the top stitch has to be performed by another sewing machine or hand-sewing, so that the sewing work for the placket cannot be performed efficiently.

  An object of the present invention is to perform various kinds of placket sewing more efficiently.

The invention described in claim 1
A cloth presser that holds the body cloth and the placket,
A cloth moving mechanism for arbitrarily moving the cloth presser along a plane on which the body cloth is placed;
A needle up-and-down movement mechanism that performs needle drop on the body cloth and the placket cloth held by the cloth presser;
A female mechanism that forms a cut along a certain direction in the body cloth and the plaster cloth held by the cloth presser;
A control device for controlling the cloth presser, the cloth moving mechanism, the needle up-and-down moving mechanism, and the knife mechanism;
The control device is
Controlling the cloth moving mechanism and the needle up-and-down moving mechanism to form a first seam and a second seam;
In a sewing machine that controls the knife mechanism to form a cut between the first seam and the second seam,
A first folding mechanism that folds the placket along the first seam;
And a second folding mechanism that folds the placket along the second seam.

The invention according to claim 2 is the sewing machine according to claim 1,
The controller is
A first stitch control for controlling the cloth moving mechanism and the needle up-and-down moving mechanism to form the first stitch and the second stitch;
Controlling the first folding mechanism, the first folding control to fold the placket fabric along the first seam;
A first turn-back between the first seam of the front cloth folded by the first turn-back mechanism and the cut formation position by the knife mechanism by controlling the cloth moving mechanism and the needle up-and-down moving mechanism. A second stitching control to form a seam;
Controlling the second folding mechanism, a second folding control for folding the placket fabric along the second seam;
By controlling the cloth moving mechanism and the needle up-and-down moving mechanism, a second fold is formed between the second seam of the front cloth folded by the second fold mechanism and the cut formation position by the knife mechanism. The third sewing control for forming the seam is sequentially executed.

The invention according to claim 3 is the sewing machine according to claim 2,
A third folding mechanism for folding the placket fabric along the second folded seam;
The controller is
A third folding control for controlling the third folding mechanism to fold the placket fabric along the second folding stitch;
By controlling the knife mechanism, cut formation control for forming a cut at the cut formation positions of the body cloth and the placket is performed in order.

The invention according to claim 4 is the sewing machine according to claim 3,
The third folding mechanism includes a front cloth presser that presses the front cloth from above by a lowering operation, and a blower mechanism that is mounted on the front cloth presser and blows air to the front cloth.

The invention according to claim 5 is the sewing machine according to any one of claims 1 to 4,
The first folding mechanism includes a front folding plate that reciprocates across the cut formation position by the knife mechanism, an actuator that is a driving source for movement of the front folding plate, and the reciprocating movement of the front folding plate. And a support mechanism for supporting the
The placket folding plate folds the placket cloth along the first seam by the movement of the forward path, and presses the placket cloth folded back along the second seam by the movement of the backward path from above.
The support mechanism includes a cam mechanism that moves the forward folding plate in the forward path at a lower position than the return path.

The invention according to claim 6 is the sewing machine according to claim 5,
The first folding mechanism includes an auxiliary pressing plate arranged with respect to the front folding plate at the start position of the reciprocating movement with a cut forming position by the knife mechanism interposed therebetween,
The support mechanism is
An interlocking mechanism for reciprocally moving the auxiliary pressing plate in conjunction with the front folding plate within a range that does not cross a cut forming position by the knife mechanism is provided.

The invention according to claim 7 is the sewing machine according to any one of claims 1 to 6,
The second folding mechanism has a blower mechanism for blowing air to the placket.

Since the present invention includes the first folding mechanism that folds the placket cloth along the first seam and the second folding mechanism that folds the placket cloth along the second seam, the vicinity of each fold is provided. This makes it possible to sew a placket that forms a top stitch, and it is possible to cope with a variety of sewings of the placket.
Further, according to the present invention, it is possible to form a top stitch, which has been conventionally performed in a separate process or manually, so that a sewing operation can be performed quickly and efficiently.

FIG. 1A to FIG. 1I are explanatory views showing each process of the upright stitching. It is a perspective view which shows the sewing machine of 1st embodiment. It is a perspective view of a cloth presser. It is a perspective view of a 1st folding | turning mechanism. FIG. 5A is a perspective view of the first folding mechanism 50 in a state where the placket folding plate 51 is moving rightward from the reciprocation start position, and FIG. 5B is a left side view thereof. . 6A is a perspective view of the first folding mechanism 50 in a state where the placket folding plate 51 is moving to the left toward the start position of the reciprocating movement, and FIG. 6B is a left side view thereof. It is. It is a perspective view of a clamp mechanism. It is a perspective view of a support frame. It is a perspective view of a 3rd folding mechanism. It is a block diagram which shows the control system of a sewing machine. It is a top view of the cloth presser holding a body cloth and a placket. It is a top view of the cloth presser after the 1st and 2nd seam formation. It is a top view of the cloth presser after the front cloth is folded by the first folding mechanism. It is a top view of the cloth presser after the formation of the first folded seam. It is a top view of the cloth presser after the front cloth is folded by the second folding mechanism. It is a top view of the cloth presser after the formation of the second folded seam. It is a top view of the cloth presser after the folding of the placket cloth by the third folding mechanism. It is a top view of the cloth presser after the cut formation by a knife mechanism. It is a flowchart which shows the operation | movement of placket sewing. It is a perspective view which shows the sewing machine of 2nd embodiment. It is a perspective view which shows the step holding member of the sewing machine of 2nd embodiment. It is a perspective view of the conventional sewing machine. FIG. 23 (A) to FIG. 23 (F) are explanatory views showing respective steps of the preliminary sewing performed by the conventional sewing machine.

[First embodiment]
Hereinafter, a first embodiment of a sewing machine according to the present invention will be described in detail with reference to the drawings. In the present embodiment, a sewing machine suitable for sewing the front cloth N to the front body cloth K will be described.

[Sewing process]
First, a sewing process when sewing the placket cloth N to the body cloth K will be described based on FIGS. 1 (A) to 1 (I).
First, a front body cloth K is prepared (FIG. 1A), and a front cloth N is placed over the neck of the body cloth K (FIG. 1B).
Next, first and second seams n1 and n2 are formed in a range from the upper end portion of the placket fabric N to the vicinity of the lower end portion (FIG. 1C). In FIG. 1C, the lower ends of the first and second seams n1, n2 are shown close to each other, but in actuality, the first seam n1 and the second seam n2 are They are parallel and are formed with some gaps between them. Alternatively, the first seam n1 may be formed downward and then folded upward to form the second seam n2.
Next, the left end portion of the front fabric N is folded back along the first seam n1 (FIG. 1D), and the space between the first seam n1 and the second seam n2 with respect to the folded front fabric N. A first folded seam n11 is formed so as to pass (FIG. 1E).
Further, the left end portion of the front fabric N is folded back along the first folded seam n11, and the right end portion of the front fabric N is folded back along the second seam n2 (FIG. 1 (F)). Then, a second folded seam n12 is formed so as to pass between the second seam n2 and the first folded seam n11 (FIG. 1 (G)).
Next, the right end portion of the front fabric N is folded back along the second folded seam n12 (FIG. 1 (H)), and the first folded seam n11 and the second folded back with respect to the body cloth K and the front fabric N. A cut c is formed at a position between the seam n12. This cut | interruption c is formed in the range from the upper end part of the placket cloth N to the lower end vicinity (FIG. 1 (I)).
Then, the respective portions on both sides of the cut c in the placket cloth N are folded back to the back side of the body cloth K, the respective portions on both sides of the cut c in the placket fabric N are folded into a rectangle, and the placket cloth N folded into the rectangle A placket is formed on the body cloth K by sewing each part to the body cloth K along both sides of the cut c.
In addition, the sewing machine 10 described below performs each process from FIG. 1A to FIG.

[Schematic configuration of sewing machine]
As shown in FIG. 2, the sewing machine 10 includes a cloth presser 20 that holds the body cloth K and the front cloth N, a table 11 on which the body cloth K is placed during sewing, and the body cloth K along the upper surface of the table 11. A cloth moving mechanism 30 for moving the garment body, a needle up-and-down moving mechanism (not shown) that causes the needle cloth K and the front cloth N held by the cloth presser 20 to drop the needle with a sewing needle, and a garment cloth held by the cloth presser 20 K and the front cloth N are supported by the female mechanism 40 that forms a cut along a predetermined direction, the first to third folding mechanisms 50, 60, and 65 that fold the front cloth N, and the cloth moving mechanism 30 side. , A holding mechanism 80 for pressing the placket cloth N at the time of sewing and cutting, a control device 90 for controlling the operation of each of the above components, and a sewing machine frame 100 for supporting the above portions.
The sewing machine 10 is also provided with a shuttle mechanism, a thread tension device, a balance, and the like.

[Sewing frame]
As shown in FIG. 2, the sewing machine frame 100 includes a bed part 101 located on the lower side, a standing body part 102 that is raised vertically from one end of the bed part 101, and a horizontal direction from the standing body part 102. And an extended arm portion 103.
In the following description, the direction along the longitudinal direction of the arm portion 103 is the Y-axis direction, the direction in which the sewing needle moves up and down is the Z-axis direction, and the direction perpendicular to the Y-axis direction and the Z-axis direction is the X-axis direction. To do. The Z-axis direction is parallel to the vertical vertical direction, and both the Y-axis direction and the X-axis direction are horizontal directions.
Further, as necessary, the front surface portion 104 side of the arm portion 103 will be described as the front side, the opposite side as the rear side, the left hand side as the left side and the right hand side as the right side with the line of sight facing backward.

[table]
The table 11 is a rectangular flat plate and is mounted on the bed portion 101 so that the upper surface thereof is horizontal. Further, the table 11 is arranged below the sewing needle supported by the needle up-and-down movement mechanism, and a sewing object such as a body cloth K is placed on the upper surface of the table 11 for sewing. Accordingly, a needle drop hole into which the sewing needle enters is formed at the needle drop position of the table 11.
A toggle clamp 14 is provided at one end of the table 11.

[Needle vertical movement mechanism]
The needle up-and-down movement mechanism includes a sewing machine motor 15 (see FIG. 10) housed in the sewing machine frame 100, an upper shaft that rotates using the sewing machine motor 15 as a drive source, and a torque obtained from the upper shaft. A crank mechanism for converting into motion, and a needle bar that holds the sewing needle at the lower end and performs reciprocating motion up and down by the crank mechanism.
In addition, since the needle | hook up-and-down moving mechanism which consists of these structures is known conventionally, the detailed description is abbreviate | omitted.

[Cloth presser]
As shown in FIG. 3, the cloth presser 20 includes a rectangular lower plate 21 and an upper plate 22 having substantially the same size. One end of the upper plate 22 is rotatably connected to one end of the lower plate 21 via hinges 222, 222, and the body cloth K is placed between the upper plate 22 and the lower plate 21. Can be sandwiched and held. The other end of the upper plate 22 is equipped with a handle 223 for rotating up and down with respect to the lower plate 21.
Further, on the upper surface of one end portion of the lower plate 21, two boss-like projections 212, 212 are fixedly mounted so that a clamp mechanism 35 to be described later holds the cloth presser 20 detachably.

The cloth presser 20 is supported by the cloth moving mechanism 30 so that the longitudinal direction of the lower plate 21 and the upper plate 22 is parallel to the Y-axis direction with the upper plate 22 closed.
In the center of the lower plate 21 and the upper plate 22 in the short direction, a long hole 221 along the longitudinal direction (the long hole of the lower plate 21 is not shown) is formed in a state of penetrating the plate surface. Yes. The elongated holes of the lower plate 21 and the elongated holes 221 of the upper plate 22 have the same length and width. When the placket cloth N is sewn, a seam and a cut are formed inside the long holes 221.

  A substantially rectangular recess 224 is formed around the elongated hole 221 on the upper surface of the upper plate 22, and the thickness of the upper plate 22 is thin inside the recess 224. Inside the recess 224, a front folding plate 51 of a first folding mechanism 50 described later is disposed in parallel with the elongated hole 221. At the time of sewing, the folding plate 51 is moved along the X-axis direction below the leading fabric N. However, since the folding plate 51 is disposed inside the recess 224, it moves without causing the leading fabric N to be caught. It can be performed.

[First folding mechanism]
As shown in FIG. 3, the first folding mechanism 50 includes a front folding plate 51 that reciprocates along the X-axis direction so as to cross the cut formation position (the long hole 221) of the front fabric N, and the front folding plate. A support mechanism 52 that supports 51 so as to be reciprocally movable, and an auxiliary presser plate 53 that is disposed with a slit formation position (long hole 221) by the scalpel mechanism 40 sandwiched between the front folding plate 51 at the reciprocating start position. And a coil spring 54 for returning the front folding plate 51 to the start position of the reciprocating movement, and an air cylinder 55 (see FIG. 8) as an actuator for moving the front folding plate 51 against the coil spring 54.
All the components of the first folding mechanism 50 other than the air cylinder 55 are supported by the upper plate 22 of the cloth presser 20, and only the air cylinder 55 is supported by the support frame 32 of the cloth moving mechanism 30 described later. Yes.

The placket folding plate 51 is a long flat plate along the Y-axis direction, and the position on the left side in the vicinity of the long hole 221 is set as the reciprocating start position.
The front folding plate 51 has the same length as the long hole 221 in the Y-axis direction, and can fold up the front cloth N over almost the entire length.

The auxiliary pressing plate 53 is a long flat plate along the Y-axis direction, and the right position near the elongated hole 221 is set as the initial position.
The auxiliary pressing plate 53 has the same length as that of the elongated hole 221 in the Y-axis direction, and can press the placket cloth N over almost the entire length.
The auxiliary pressing plate 53 is supported by a second movable body 523 of a support mechanism 52 described later so as to be tiltable about the Y axis, and is decentered to the left side from the center of the tilt axis of the second movable body 523. Has a pressing surface of the front fabric N. The auxiliary presser plate 53 is equipped with two magnets 531 at a position eccentric to the left side of the center of the tilt axis of the second movable body 523.
The upper plate 22 is made of a magnetic material, for example, steel, and the auxiliary pressing plate 53 is tilted toward the upper plate 22 by the attraction force of the two magnets 531, so that the holding pressure on the front cloth N on the upper plate 22 is increased. It can be granted.

  The support mechanism 52 can tilt the auxiliary presser plate 53 around the Y axis, a holding frame 521 that fixes and holds the front folding plate 51, a first movable body 522 that supports the holding frame 521 so as to tilt around the Y axis. A second movable body 523 supported on the slide, a slide rail 524 that guides the first movable body 522 and the second movable body 523 so as to be movable along the X-axis direction, and the reciprocating direction of the folding plate 51 Accordingly, a cam mechanism 56 that adjusts the height of the front folding plate 51 and an interlocking mechanism 57 that reciprocates the auxiliary presser plate 53 in conjunction with the front folding plate 51 are provided.

  The holding frame 521 is supported by the first movable body 522 so as to be tiltable about the Y axis, and holds the front folding plate 51 at a position eccentric to the left side of the center of the tilt axis of the first movable body 522. ing. Therefore, when the holding frame 521 tilts with respect to the first movable body 522, the front folding plate 51 can be moved up and down with respect to the upper surface of the upper plate 22.

FIG. 4 is an enlarged perspective view of the periphery of the support mechanism 52. As shown in the figure, the first movable body 522 is provided with a plate-like standing plate portion 522a at the left end, and the standing plate portion 522a has a leftward tension with respect to the first movable body 522. The one end part of the coil spring 54 which provides is connected.
Further, a semicircular cutout 522b that opens upward is formed at the upper end of the upright plate portion 522a. A plunger of an air cylinder 55 that is projected to the right is fitted into the notch 522b so as to be connected from above.

  FIG. 5A is a perspective view of the first folding mechanism 50 in a state where the placket folding plate 51 is moving to the right from the start position of the reciprocating movement, and FIG. 5B is a left side view thereof. 6A is a perspective view of the first folding mechanism 50 in a state in which the front folding plate 51 is moving leftward toward the reciprocating start position, and FIG. 6B is a left side view thereof. FIG.

As shown in FIGS. 4 to 6, the cam mechanism 56 includes a boss 561 that functions as a follower of a cam mounted on the holding frame 521, a cam plate 562 that includes a cam surface with which the boss 561 is in sliding contact, and a cam plate 562. And a spring 563 that urges the lens in a predetermined direction.
The boss 561 is a round bar-like protrusion that extends forward on the front surface of the holding frame 521, and is provided on the left side with respect to the central axis of tilting of the holding frame 521. Since the front folding plate 51 is also fixedly supported to the left with respect to the central axis of the tilt of the holding frame 521, when the boss 561 is pressed upward or downward from the cam plate 562, the front folding plate 51 is also interlocked. Similarly, it is pressed upward or downward.

One end of the cam plate 562 is supported by the support bracket 564 so as to be rotatable about the Y axis on the upper plate 22 and extends rightward from the support end.
The cam plate 562 includes a cam portion 562a whose upper surface and lower surface serve as a cam surface in sliding contact with the boss 561, and the cam portion 562a extends along the X-axis direction. The cam portion 562a is positioned to the right of the position of the boss 561 when the placket folding plate 51 is at the reciprocating start position.

The cam plate 562 has a protruding portion 562b. One end of a spring 563 is connected to the protruding portion 562b, and the cam plate 562 and the right end of the cam portion 562a are applied with tension in a downward direction. Yes.
Thereby, the upper surface and the lower surface of the cam portion 562a are maintained in an inclined state in which the cam portion 562a becomes lower from the left end portion toward the right end portion.

  The left end portion of the cam portion 562a in such an inclined state is higher than the boss 561, and when the boss 561 moves rightward from the reciprocating start position on the left side of the cam portion 562a, the cam portion 562a. Slidably contact the lower surface side of. For this reason, the front folding plate 51 moves to the right while receiving a downward pressing force from the spring 563 via the boss 561 and the cam plate 562.

  Further, the right end portion of the cam portion 562a is lower than the boss 561. When the boss 561 moves to the left from the right side of the cam portion 562a toward the start position of the reciprocating movement, the upper surface side of the cam portion 562a. Slid in contact. For this reason, the front folding plate 51 moves to the left via the boss 561 and the cam plate 562 while being lifted upward along the upper surface of the cam portion 562a inclined upward.

As shown in FIGS. 3 and 4, the interlocking mechanism 57 includes a connecting rod 571 extending rightward from the first movable body 522 and the first and second movable bodies 523. Abutting portions 572 and 573 and a left stopper 574 and a right stopper 575 for restricting the movable range of the second movable body 523 are provided.
The connecting rod 571 has a long plate shape along the left-right direction, and the left end portion is fixedly supported by the first movable body 522. Further, the right end portion of the connecting rod 571 is provided with a plate-like locking portion 571a bent downward.

The first and second contact portions 572 and 573 are both flat plates provided on the upper portion of the second movable body 523, and the first contact portion 572 is the right end of the second movable body 523. The second contact portion 573 is disposed at the left end portion. And the 1st contact part 572 and the 2nd contact part 573 are arrange | positioned on the same line along the X-axis direction.
Further, the locking portion 571a of the connecting rod 571 described above is disposed so as to be between the first contact portion 572 and the second contact portion 573.

  Accordingly, when the first movable body 522 starts to move to the right from the start position of the reciprocating movement, the first movable body 522 is retained until the locking portion 571a of the connecting rod 571 reaches the first contact portion 572. Only when the locking portion 571a reaches the first abutting portion 572, the second movable body 523 moves to the right together with the first movable body 522 when the locking portion 571a reaches the first contact portion 572. I do.

  When the first movable body 522 starts moving leftward toward the reciprocating start position, the locking portion 571a of the connecting rod 571 moves away from the first contact portion 572 and the second contact portion. Until reaching 573, only the first movable body 522 moves to the left, and when the locking portion 571a reaches the second abutting portion 573, the second movable body 523 is pushed by the connecting rod 571. Also moves to the left together with the first movable body 522.

The left stopper 574 is arranged on the left side of the second movable body 523, and the second movable body 523 abuts the left stopper 574, thereby preventing further leftward movement. That is, the left stopper 574 defines the left end position of the movable range of the second movable body 523.
When the left stopper 574 stops the leftward movement of the second movable body 523, the leftward movement of the first movable body 522 interlocked by the interlocking mechanism 57 is also stopped. That is, it can be said that the left stopper 574 also defines the left end position of the movable range of the first movable body 522.
And when the 1st movable body 522 is located in the left end position of the movable range prescribed | regulated by this left stopper 574, it sets so that the front folding plate 51 may become a "starting position of a reciprocation."
Further, when the second movable body 523 is positioned at the left end position of the movable range defined by the left stopper 574, the auxiliary pressing plate 53 is set to an “initial position” in the vicinity of the right side of the long hole 221. Has been.

The right stopper 575 is disposed to the right of the second movable body 523, and the second movable body 523 abuts against the right stopper 575 to stop further rightward movement. That is, the right stopper 575 defines the right end position of the movable range of the second movable body 523.
When 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 interlocked by the interlocking mechanism 57 is also stopped. That is, it can be said that the right stopper 575 also defines 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 the arm portion 321 of the support frame body 32 of the cloth moving mechanism 30 to be described later with the plunger protruding direction toward the right side ( (See FIG. 8).
The plunger of the air cylinder 55 is formed with two flanges arranged side by side. When the plunger is connected to the semicircular notch 522b formed in the standing plate portion 522a of the first movable body 522, Used. That is, when the plunger is fitted and connected to the semicircular cutout 522b, the vertical plate 522a is sandwiched between the two flanges so that the plunger moves in the forward / backward movement direction to the first movable body 522. Can communicate.
Thus, the standing plate portion 522a of the first movable body 522 and the plunger of the air cylinder 55 have a structure that can be connected and removed very easily.

  The air cylinder 55 is not supported by the cloth presser 20, but this is because the cloth presser 20 is detachably held from a base 31 of a cloth moving mechanism 30 described later. That is, when the air cylinder 55 is supported on the cloth presser 20 side, when the cloth presser 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 the air cylinder 55. This is because the work of attaching and detaching the cloth presser 20 becomes complicated. On the other hand, when the air cylinder 55 is configured to be supported by the cloth movement mechanism 30 side, the plunger of the air cylinder 55 and the first movable body 522 need to be detachable. It has a structure that can be easily attached and detached.

[Cloth movement mechanism]
As shown in FIG. 2, the cloth moving mechanism 30 is a base 31 that supports the cloth presser 20, a support frame 32 that supports various configurations described later, and a drive source that moves the base 31 along a horizontal plane. An X-axis motor 33 and a Y-axis motor 34 (see FIG. 10) are provided.

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

  The base 31 is fixedly equipped with a clamp mechanism 35 that detachably holds the cloth presser 20. As shown in FIG. 7, the clamp mechanism 35 includes a receiving plate 351 formed with recesses 352 and 352 in which the two boss-like protrusions 212 and 212 of the cloth presser 20 are fitted, and recesses 352 and 352. The clamp members 353 and 353 formed with claws for holding the projections 212 and 212 of the fitted cloth presser 20 so as not to come off, and the holding state and release state of the projections 212 and 212 by the clamp members 353 and 353 are switched. Air cylinders 354 and 354 are provided.

When the protrusions 212 and 212 of the cloth presser 20 are fitted in the two concave portions 352 and 352 of the receiving plate 351, the clamp mechanism 35 is rotated in the direction in which the clamp members 353 and 353 are held by driving the air cylinders 354 and 354. Move. Accordingly, the protrusions 212 and 212 are sandwiched between the recesses 352 and 352 and the clamp members 353 and 353, and the cloth presser 20 is fixed to the base 31.
Further, when the cloth presser 20 is separated, the cloth presser 20 is rotated to the opposite side to the case where the clamp members 353 and 353 are held by the air cylinders 354 and 354. Thereby, there is no thing holding the protrusions 212 and 212 inside the recesses 352 and 352, and the cloth presser 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 described above.
The support frame 32 is fixedly mounted on the front end portion of the base 31 and is positioned above the cloth presser 20 held by the clamp mechanism 35.
The support frame 32 includes two arm portions 321 and 322 that extend forward from both ends in the X-axis direction along the Y-axis direction.
The support frame 32 supports the air cylinder 55 of the first folding mechanism 50 at the front end portion of one (left side) arm portion 321.
In addition, the other (right) arm portion 322 supports a second folding mechanism 60 described later.
Further, the holding mechanism 80 is supported between the two arm portions 321 and 322.

[Holding mechanism]
As shown in FIG. 8, the holding mechanism 80 includes two front presser plates 81, 81 for pressing and holding the front fabric N from above in the vicinity of the left and right sides of the elongated hole 221 of the cloth presser 20 attached to the clamp mechanism 35. , Support members 82 and 82 that individually support the respective plaster pressing plates 81 and 81, and air cylinders 83 and 83 that individually raise and lower the prop pressing plates 81 and 81 through the supporting members 82 and 82. .

The two upright holding plates 81, 81 are long, have the same length as the long holes 221, and are arranged in parallel with the long holes 221.
In addition, since the front cloth N is pressed and held from above in the vicinity of the left and right sides of the long hole 221, it is possible to suppress the vibration of the front cloth N up and down due to the vertical movement of the sewing needle during sewing, and good sewing is possible. And
The presser plates 81 and 81 hold the front cloth N only when the needle drop is performed by the needle up-and-down movement mechanism and when the cut is formed by the knife mechanism 40. In other cases, the front cloth is used. The air cylinders 83 and 83 are controlled so as to retreat upward so as not to hinder the N folding operation.

The support members 82 and 82 are so-called bell cranks, and are rotated by air cylinders 83 and 83.
And the supporting members 82 and 82 raise and lower the front presser plates 81 and 81 by rotating.

[Second folding mechanism]
As shown in FIG. 8, the second folding mechanism 60 is a blower mechanism that further folds the end portion of the front cloth N folded back to the right side by the first folding mechanism 50 to the left side.
The second folding mechanism 60 includes two air ejection nozzles 61 and 61 as air blowing mechanisms and supports 62 and 62 that support the air ejection nozzles 61 and 61. Each of the air ejection nozzles 61 and 61 is cylindrical, and is disposed on the right side of the long hole 221 of the cloth presser 20 in a state along the Y-axis direction. Each of the air ejection nozzles 61, 61 is provided with a plurality of air blowing ports (not shown) along its longitudinal direction, and blows air toward the left side over the entire width in the Y-axis direction of the placket N. It is possible to fold the end portion of the front cloth N folded back to the right side by the first folding mechanism 50 further to the left side.

If the second folding mechanism 60 is also supported on the cloth presser 20 side, each air ejection nozzle 61 of the air hose that supplies high-pressure air when the cloth presser 20 is attached to and detached from the base 31 is used. , 61 is required, and the work of attaching and detaching the cloth presser 20 becomes complicated.
Therefore, the second folding mechanism 60 is also provided on the support frame 32 to facilitate the work of attaching and detaching the cloth presser 20.

[Third folding mechanism]
As shown in FIGS. 2 and 9, the third folding mechanism 65 includes a holding frame 66 as a front cloth presser that presses the front cloth N from above on the left side of the elongated hole 221 of the cloth presser 20 (see FIG. 17), Air jet nozzles 67 and 67 serving as a blowing mechanism stored inside the presser frame 66, an air cylinder 68 that raises and lowers the presser frame 66, and a support bracket 69 that supports the air cylinder 68, The surface of the sewing machine frame 100 is screwed.

The air cylinder 68 is supported by the support bracket 69 at the right end portion of the surface portion 104 with the plunger directed downward.
A pressing frame 66 is provided at the lower end of the plunger, and the pressing pressure of the front cloth N is obtained by the protruding pressure of the air cylinder 68.

The holding frame 66 is a rectangular frame body along the Y-axis direction, and the left side surface and the right side surface are wide open. Then, the placket cloth N can be pressed by the bottom surface of the pressing frame 66.
Further, two air ejection nozzles 67 and 67 are stored inside the presser frame 66. These air ejection nozzles 67 and 67 are both cylindrical and are arranged inside the presser frame 66 in a state along the Y-axis direction. Each of the air ejection nozzles 67, 67 is provided with a plurality of air blowing ports (not shown) along the longitudinal direction thereof, all of which blow out toward the right side (see FIG. 17).

  With this configuration, the third folding mechanism 65 can fold the right end portion of the front cloth N to the right by the air from the air ejection nozzles 67 and 67 while pressing the right end portion of the front cloth N with the holding frame 66.

[Female mechanism]
As shown in FIG. 2, the knife mechanism 40 includes a knife (not shown) having a blade at the lower end and a drive mechanism for reciprocating the knife up and down.
The knife is arranged adjacent to the left side of the sewing needle, and forms a cut c in the placket cloth N and the body cloth K when lowered.
The drive mechanism includes a knife drive motor 41 (see FIG. 10) and a conversion mechanism such as a crank mechanism that converts the torque of the knife drive motor 41 into a vertical reciprocating motion. The drive source of the knife drive mechanism may be an air cylinder.
When forming a cut in the placket cloth N and the body cloth K, the elongated hole 221 of the cloth presser 20 moves below the knife, and further, the knife is moved while moving the cloth presser 20 along the Y-axis direction. By moving up and down, a cut c along the Y-axis direction is formed in the front cloth N and the body cloth K.

[Sewing machine control system: 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 in which a program for performing operation control in sewing is stored, a RAM (Random Access Memory) 93 serving as a work area for arithmetic processing, sewing data, and the like. A rewritable nonvolatile data memory 94 as a storage unit for storing various data and a CPU 91 (Central Processing Unit) for executing a program in the ROM 92 are provided.

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 female drive motor drive circuit 41a through an interface (not shown). The drive of the shaft motor 33, the Y-axis motor 34, and the knife drive motor 41 is controlled.
Further, the CPU 91, via an interface (not shown), the air cylinder 55 of the first folding mechanism 50, the air ejection nozzle 61 of the second folding mechanism 60, the air cylinder 68 of the third folding mechanism 65, and the third folding. A drive circuit 55b for controlling the electromagnetic valves 55a, 61a, 68a, 67a, 354a, 83a for operating the air ejection nozzle 67 of the mechanism 65, the air cylinder 354 of the clamp mechanism 35, and the air cylinder 83 of the holding mechanism 80, 61b, 68b, 67b, 354b, 83b.
The sewing machine 10 includes an air ejection nozzle 61 of the second folding mechanism 60, an air ejection nozzle 67 of the third folding mechanism 65, an air cylinder 354 of the clamp mechanism 35, an air cylinder 83 of the holding mechanism 80, and their solenoid valves. 61a, 67a, 354a, 83a and their drive circuits 61b, 354b, 83b are all provided in two, but only one is shown in FIG.

The data memory 94 defines the cloth feed amounts of the X-axis motor 33 and the Y-axis motor 34 for moving the cloth presser 20 to form the stitches n1, n2, the folded stitches n11, n12 and the cut c, which will be described later. The cloth feed data, the number of rotations of the sewing machine motor 15 and the knife drive motor 41 are recorded, and the CPU 91 reads the data setting contents for each stitch when sewing, and controls the operation of each configuration of the sewing machine. Run.
The control device 90 is also provided with a pedal switch 95 for proceeding with the sewing operation.

[Praft sewing operation]
The upright sewing operation by the sewing machine 10 will be described based on the operation explanatory diagrams of FIGS. 11 to 18 and the flowchart of FIG.
Note that the holding mechanism 80 and the support frame body 32 are not shown in the operation explanatory diagrams of FIGS.

First, as a setting operation before starting sewing, the upper plate 22 of the cloth presser 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. Then, the upper plate 22 is closed and the body cloth K is clamped.
Further, since the placket folding plate 51 and the auxiliary pressing plate 53 on the upper plate 22 are maintained at the start position and the initial position of the reciprocating movement by the coil spring, respectively, the auxiliary pressing plate 53 is opposed to the magnet 531. The upholstery cloth N is arranged so that the planned formation position of the seam matches the position of the slot 221 and the auxiliary presser plate 53 is lowered. At this time, the placket cloth N is arranged so that the placket folding plate 51 is hidden under the placket cloth N.
Then, the two protrusions 212, 212 of the cloth presser 20 are fitted into the recesses 352, 352 of the receiving plate 351 of the clamp mechanism 35, and the air cylinder 55 of the first folding mechanism 50 is connected to the first movable body 522.
Initially, the air cylinder 55 of the first folding mechanism 50 is in a state in which the plunger is retracted, and the plunger is connected to the semicircular notch 522 b formed in the first movable body 522 of the support mechanism 52. .

When the pedal switch 95 is pressed, the CPU 91 operates the air cylinders 354 and 354 through the electromagnetic valves 354a and 354a, and holds the projections 212 and 212 by the clamp members 353 and 353 (step S1).
Next, when the pedal switch 95 is pressed, the CPU 91 operates the air cylinders 83, 83 through the electromagnetic valves 83a, 83a, and lowers the front presser plates 81, 81 to hold the front fabric N on both the left and right sides of the long hole 221. Perform (step S3).

Then, when the pedal switch 95 is pressed, the CPU 91 causes the sewing start position near the center portion in the X-axis direction at the rear end portion of the front cloth N held by the cloth presser 20 to be below the sewing needle. The cloth presser 20 is moved by controlling the X-axis motor 33 and the Y-axis motor 34 (step S5, FIG. 11).
Next, the CPU 91 starts driving the sewing machine motor 15 and controls the X-axis motor 33 and the Y-axis motor 34 to form the first stitch n1 and the second stitch n2 (step S7, FIG. 12, [First sewing control]).

Next, the CPU 91 raises the front presser plates 81, 81 by the air cylinders 83, 83 to release the front fabric N (step S9).
Further, the CPU 91 operates the air cylinder 55 through the electromagnetic valve 55 a to move the front folding plate 51 at the reciprocation start position in a direction (rightward) across the elongated hole 221 against the coil spring 54. As a result, the left end portion of the front fabric N is folded back to the right with the first seam n1 as the fold. The front folding plate 51 also moves the auxiliary pressing plate 53 to the right side by the interlocking mechanism 57 and stops at the right end of each movable range by the right stopper 575. The front folding plate 51 and the auxiliary presser plate 53 both stop at a position away from the front fabric N to the right (step S11, FIG. 13, [first folding control]).
When the front folding plate 51 is moved to the right, the boss 561 of the holding frame 521 is in sliding contact with the lower surface of the cam portion 562a of the cam plate 562 of the cam mechanism 56 and is moved downward. (See FIGS. 5A and 5B). Thereby, the placket cloth N can be firmly folded along the first seam n1.

Next, the CPU 91 lowers the front presser plates 81 and 81 again by the air cylinders 83 and 83 to hold the front fabric N (step S13).
Then, the CPU 91 controls the sewing motor 15, the X-axis motor 33, and the Y-axis motor 34 to change the first folding stitch n11 between the first stitch n1 and the cut formation position (scheduled formation position) of the female mechanism 40. (Step S15, FIG. 14, [second sewing control]).

Next, the CPU 91 raises the front presser plates 81, 81 by the air cylinders 83, 83 to release the front fabric N (step S17).
Further, the CPU 91 controls the electromagnetic valve 61a to eject air to the left from the air ejection nozzles 61, 61 of the second folding mechanism 60, and sets the left end portion of the placket cloth N to the first folding stitch n11. The fold line is folded back to the left side, and the right end portion of the front cloth N is folded back to the left side using the second seam n2 as a fold line (step S19).

Further, the CPU 91 retracts the plunger of the air cylinder 55 to return the front folding plate 51 in the folding position to the start position of the reciprocating movement (step S21, FIG. 15, [second folding control]). Further, the front folding plate 51 moves the auxiliary pressing plate 53 to the left side by the interlocking mechanism 57 and stops at the left end portion of each movable range, that is, the start position and the initial position of the reciprocating movement by the left stopper 574.
When the front folding plate 51 is moved to the left, the boss 561 of the holding frame 521 is in sliding contact with the upper surface of the cam portion 562a of the cam plate 562 of the cam mechanism 56 and moved upward. (See FIGS. 6A and 6B). Thereby, it is possible to press the plait cloth N with an appropriate pressing pressure without causing a catch on the placket cloth N that has been laminated and thickened by folding several times.

Next, the CPU 91 lowers the front presser plates 81 and 81 again by the air cylinders 83 and 83 to hold the front fabric N (step S23).
Then, the CPU 91 controls the sewing motor 15, the X-axis motor 33, and the Y-axis motor 34 so that the second folding stitch n12 is positioned between the cut formation position (formation planned position) of the female mechanism 40 and the second stitch n2. (Step S25, FIG. 16, [third sewing control]).

Next, the CPU 91 raises the front presser plates 81, 81 by the air cylinders 83, 83 to release the front fabric N (step S27).
Further, the CPU 91 operates the air cylinder 55 through the electromagnetic valve 55a to move the front folding plate 51 and the auxiliary pressing plate 53 at the reciprocation start position to the right end of the movable range again. Thereby, both the front folding plate 51 and the auxiliary pressing plate 53 are stopped at a position away from the front fabric N to the right (step S29).

Next, the CPU 91 lowers the pressing frame 66 of the third folding mechanism 65 by the air cylinder 68 and presses the front cloth N from above. At this time, the cloth presser 20 is moved by the cloth moving mechanism 30 so that the position between the left end of the front cloth N folded back to the left side and the right end of the front cloth N folded back to the left is the lowering position of the press frame 66. The movement control is performed so that only the left end portion of the front standing cloth N can be pressed by the lowering of the pressing frame 66.
Further, the CPU 91 controls the electromagnetic valve 67a to eject air to the right from the air ejection nozzles 67, 67 of the third folding mechanism 65, and the second folding seam n12 is applied to the right end of the front cloth N. Fold it to the right as a crease (step S31, FIG. 17, [Third Folding Control])

Next, the CPU 91 lowers the front presser plates 81 and 81 again by the air cylinders 83 and 83 to hold the front fabric N (step S33).
Then, the CPU 91 controls the X-axis motor 33 and the Y-axis motor 34 to move the cloth presser 20 below the knife mechanism 40.
Furthermore, the drive of the knife drive motor 41 is started and the cloth presser 20 is fed along the Y-axis direction to form a cut c between the first folded seam n11 and the second folded seam n12 (step S35). FIG. 18, [Cut formation control]).

  Thereafter, the CPU 91 raises the front presser plates 81, 81 by the air cylinders 83, 83 to release the front cloth N (step S37), and the projections 212, 212 by the clamp members 353, 353 by the air cylinders 354, 354. The holding state is released, and the placket sewing operation is finished (step S39).

[Technical effect]
The sewing machine 10 includes a first folding mechanism 50 that folds the front cloth N along the first seam n1, and a second folding mechanism 60 that folds the front cloth N along the second seam n2. As a result, it is possible to sew on the front such that top stitches (first and second folded seams n11, n12) are formed in the vicinity of the respective folds, and it is possible to cope with a variety of sewing on the front.
Moreover, since the sewing machine 10 can form a top stitch that has been conventionally performed in a separate process or manually, the sewing operation can be performed quickly and efficiently.

In addition, the control device 90 of the sewing machine 10 controls the cloth moving mechanism 30 and the needle up-and-down moving mechanism to form the first stitch n1 and the second stitch n2, and the first folding back. The mechanism 50 is controlled to control the first folding control for folding the placket cloth N along the first seam n1, the cloth moving mechanism 30 and the needle up-and-down moving mechanism, and the first folding mechanism 50 is folded back. A second stitching control for forming a first folding stitch n11 between the first stitch n1 of the standing fabric N and the position (formation scheduled position) of the cut c by the knife mechanism 40, and a second folding mechanism. 60, the second folding control for folding the placket fabric N along the second seam n <b> 2, the fabric moving mechanism 30 and the needle up-and-down movement mechanism, and the second folding mechanism 60 folds back the fabric. Second stitch of placket N A third and a sewing control for forming the second folding seam n12 run sequentially between the forming position of the cut by (formation scheduled position) n2 and knife mechanism.
This makes it possible to efficiently sew complicated plackets with a simple configuration.

  Further, the sewing machine 10 includes a third folding mechanism 65 that folds the front cloth N along the second folding seam n12, and the control device 90 controls the third folding mechanism 65 so that the front cloth N is A third folding control that folds along the second folding stitch n12, and a cut formation control that controls the knife mechanism 40 to form a cut at the cut formation position (formation planned position) of the body cloth K and the front cloth N Are executed in order, so that when forming the cut c by the knife mechanism 40 after the formation of the second folded seam n12, the front cloth N can be prevented from obstructing the cutting operation, and the manual operation can be performed. It becomes possible to perform more efficient sewing as unnecessary.

The first folding mechanism 50 of the sewing machine 10 serves as a driving source for the front folding plate 51 that reciprocates across the cut forming position by the scalpel mechanism 40 and at least one side movement of the front folding plate 51. An air cylinder 55 as an actuator and a support mechanism 52 that supports the front folding plate 51 so as to be able to reciprocate are provided. The front folding plate 51 moves in a direction in which the plunger of the air cylinder 55 protrudes to the right (in the forward path). The placket cloth N is folded back along the first seam n1, and the placket folded back along the second seam n2 by the movement of the plunger of the air cylinder 55 in the backward direction (movement of the return path). The support mechanism 52 presses the cloth N from above, and the support mechanism 52 moves the forward movement of the front folding plate 51 at a position lower than the movement of the return path. The has.
As a result, even if the thickness of the placket folding plate 51 is changed by folding or the like as the sewing of the placket fabric N progresses, the placket folding plate 51 can be pressed against the placket folding plate 51 at an appropriate height with an appropriate pressing force. Sewing can be performed.

Further, the first folding mechanism 50 of the sewing machine 10 has an auxiliary pressing plate 53 that is arranged with a cut formation position (formation planned position) by the knife mechanism 40 sandwiched between the front folding plate 51 at the start position of the reciprocating movement. The support mechanism 52 includes an interlocking mechanism 57 that reciprocally moves the auxiliary pressing plate 53 in conjunction with the front folding plate 51 within a range that does not cross the cut formation position (formation formation position) by the knife mechanism 40.
Thus, the front folding plate 51 and the auxiliary pressing plate 53 are individually arranged on both sides of the cut forming position (formation forming position) by one air cylinder 55 (actuator), and the front folding plate 51 and the auxiliary pressing plate. 53 can be switched to a state in which both of them are retracted to one side of the cut formation position (formation formation position), and the manufacturing cost of the sewing machine can be reduced by reducing the number of parts.

The second folding mechanism 60 of the sewing machine 10 has an air ejection nozzle 61 as a blower mechanism that blows air to the front cloth N.
For this reason, the folding operation of the front cloth N can be realized with a simple configuration, and since it can be folded back from a position away from the front cloth N, the degree of freedom of arrangement of the second folding mechanism 60 is high. It becomes possible to facilitate the design of the sewing machine 10.
Furthermore, since the air ejection nozzle 61 does not require mechanical operation, it is possible to reduce maintenance work and improve operation reliability.

Similarly, the third folding mechanism 65 includes a holding frame 66 that presses the front cloth N from above by a lowering operation, and an air ejection nozzle 67 that is mounted on the holding frame 66 and serves as a blowing mechanism that blows air to the front cloth N. Thus, the same effect as the second folding mechanism 60 can be obtained, and the pressing work of the placket cloth N by the pressing frame 66 can be performed.
In addition, since the entire configuration of the third folding mechanism 65 can be retracted upward, the degree of freedom of arrangement of the third folding mechanism 65 can be further increased.

In addition, since the sewing machine 10 allows the cloth presser 20 to be attached to and detached from the base 31, it is not necessary to perform the work of attaching the body cloth K and the front cloth N to the cloth presser 20 in a narrow area around the sewing needle. It becomes possible to improve workability.
In addition, it is possible to prevent the body cloth K and the front cloth N from being damaged by the mechanism around the sewing needle.

Further, the air cylinder 55 that performs the folding operation of the first folding mechanism 50 is supported by the base 31 via the support frame 32 instead of the cloth presser 20. This eliminates the need to attach and detach the air hose, thereby improving workability.
Similarly, the second folding mechanism 60 is supported not by the cloth presser 20 but by the base 31 via the support frame 32, so that the air ejection nozzle of the second folding mechanism 60 that accompanies the attachment / detachment of the cloth presser 20. The work of attaching and detaching 61 and the air hose is unnecessary, 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 work of attaching and detaching the air cylinder 68, the air ejection nozzle 67, and the air hose is unnecessary, and the workability can be improved. It becomes possible.

[Second Embodiment]
A sewing machine 10B according to the second embodiment will be described with reference to FIGS. Regarding the sewing machine 10B, the description of the same configuration as that of the sewing machine 10 described above will be omitted, and points different from the sewing machine 10 will be mainly described.

As shown in FIG. 20, the sewing machine 10 </ b> B includes a step presser mechanism 110. The step presser mechanism 110 is controlled by the control device 90. The step presser mechanism 110 is supported by a female mechanism 40 provided at the tip of the arm portion 103 of the sewing machine 10B via a bracket 111. The step pressing mechanism 110 has a support plate 112 fixed to the bracket 111, and an air cylinder 113 is fixed to the support plate 112. The air cylinder 113 includes a rod 114, and moves the rod 114 forward and backward by supplying air. A stay 115 is fixed to the tip of the rod 114. A guide block 116 is fixed to the support plate 112, and the guide block 116 includes a guide rod 117 that can slide along the rod 114 of the air cylinder 113.
The tip of the guide rod 117 is fixed to the stay 115. Thereby, the stay 115 is supported without rotating on the axis of the rod 114. A support block 118 is fixed to the stay 115 with screws, and a step presser member 121 is detachably provided on the support block 118.

As shown in FIG. 21, the step pressing member 121 includes a fixed block portion 122 fixed to the support block 118 and a pressing portion 123 supported on the lower end of the fixed block portion 122. The pressing portion 123 includes a guide plate portion 124 and a pressing plate portion 125, and the guide plate portion 124 and the pressing plate portion 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 pressing plate portion 125. The holding plate 125 is biased downward by a biasing member (not shown) such as a spring.
The step presser member 121 presses the front cloth N while guiding the folded step d of the front cloth N. The guide plate portion 124 is disposed along the folding step portion d at a position adjacent to the folding step portion d removed from the folded placket N. Further, the presser plate portion 125 is disposed at a position adjacent to the folded step portion d on the folded front cloth N and presses the front cloth N from above. A gap G is provided between the guide plate portion 124 and the holding plate portion 125, and a sewing needle 12 and a cylindrical cloth presser 12 a provided so as to surround the sewing needle 12 are provided in the gap G. Is arranged (see FIG. 20).

  In the step presser mechanism 110, the rod 114 is advanced and retracted by the air cylinder 113, so that the step presser member 121 is in the vicinity of the position where the sewing needle 12 of the needle up-and-down moving mechanism is sewn to the front cloth N. It moves between the retraction position deviated from this step press position.

  When the rod 114 is extended by the air cylinder 113 of the step presser mechanism 110 and the step presser member 121 is disposed at the step presser position, the folded step portion d of the front cloth N is guided by the guide plate portion 124. The folded portion of the placket cloth N is pressed by the pressing plate portion 125. In this state, when the sewing is performed on the front cloth N by the sewing needle 12 of the needle up-and-down movement mechanism, lifting of the front cloth N at the time of sewing is suppressed, and the width between the folding step portion d and the seam is reduced. A certain edge width W is maintained at a predetermined dimension.

In addition, the position of the step presser mechanism 110 can be adjusted with respect to the arm part 103 in the vertical direction, the left and right direction, and the front-rear direction which is the extending direction of the arm part 103. By performing the above, it is possible to cope with the change of the edge width W, the thickness of the front cloth N, and the like.
Further, the step presser mechanism 110 can cope with the change of the edge width W, the thickness of the front cloth N, and the like by attaching and detaching the step presser member 121.

Next, control of the step presser mechanism 110 by the CPU 91 of the control device 90 will be described.
The CPU 91 executes first stitch control (step S7 in FIG. 19) for forming the first stitch n1 and the second stitch n2, and further, the left end portion of the placket cloth N is set to the first stitch n1. After executing the first folding control (steps S9 and S11 in FIG. 19) to fold back to the right side as the fold, the second sewing control using the step presser mechanism 110 (steps S13 and S15 in FIG. 19) is performed.

  In this second sewing control, the CPU 91 first lowers the front presser plates 81 and 81 by the air cylinders 83 and 83 to hold the front fabric N (step S13 in FIG. 19).

  Next, the CPU 91 extends the rod 114 of the air cylinder 113 of the step presser mechanism 110 and places the step presser member 121 in the retracted position at the step presser position. Then, the folding step portion d of the front cloth N folded by the first folding control is guided by the guide plate portion 124, and the folded portion of the front cloth N is pressed by the pressing plate portion 125.

  Then, the CPU 91 controls the sewing machine motor 15, the X-axis motor 33, and the Y-axis motor 34, so that the sewing cloth 12 of the needle up-and-down moving mechanism is set against the front fabric N by the sewing needle 12 of the needle vertical movement mechanism. Is formed between the first seam n1 and the second seam n2, specifically, between the first seam n1 and the formation position of the cut c formed by the knife mechanism 40 (in FIG. 19). Step S15).

  At this time, the presser plate portion 125 of the step presser member 121 suppresses the lifting of the front cloth N, and the guide plate portion 124 of the step presser member 121 has a width between the folded stepped portion d and the first folded seam n11. The edge width W is maintained at a predetermined dimension.

  As described above, according to the sewing machine 10B according to the second embodiment, when the vicinity of the folded step portion d of the folded cloth N is sewn along the folded step portion d, the step cloth N The folding step portion d can be guided in the vicinity of the sewing position by the sewing needle 12 of the needle up-and-down movement mechanism. As a result, when the first folded seam n11 is formed on the placket cloth N, the edge width W, which is the width from the folded step d to the first folded seam n11, is stably maintained at a predetermined dimension. be able to. Thereby, the finish of placket sewing can be made favorable.

[Others]
In addition, in the sewing machine 10 or the sewing machine 10B, the order of each process of sewing can be changed suitably.
For example, the cut c may be formed before the formation of the stitches n1 and n2. The cut c may be formed after the formation of the stitches n1 and n2 and before the folding cloth N is folded back along the stitch n1.

  The air cylinder 55 as an actuator of the first folding mechanism 50 of the sewing machine 10 is a single-acting type in which the plunger protrudes by supplying air pressure. However, a double-acting type in which the plunger is protruded and retracted by air pressure may be used.

10, 10B Sewing machine 12 Sewing needle 15 Sewing machine motor 21 Lower plate 22 Upper plate 30 Cloth moving mechanism 33 X-axis motor 34 Y-axis motor 40 Female mechanism 50 First folding mechanism 51 Front folding plate 52 Support mechanism 53 Auxiliary presser plate 54 Coil spring 55 Air cylinder (actuator)
56 Cam mechanism 57 Interlocking mechanism 60 Second folding mechanism 61 Air ejection nozzle (air blowing mechanism)
65 Third folding mechanism 66 Presser frame (holding cloth holder)
67 Air ejection nozzle (air blowing mechanism)
68 Air 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 Contacting part 573 Contacting part 574 Left stopper 575 Right stopper c Cut K Body material N Cloth n1 First seam n11 First folded seam n12 Second folded seam n2 Second seam

Claims (7)

A cloth presser that holds the body cloth and the placket,
A cloth moving mechanism for arbitrarily moving the cloth presser along a plane on which the body cloth is placed;
A needle up-and-down movement mechanism that performs needle drop on the body cloth and the placket cloth held by the cloth presser;
A female mechanism that forms a cut along a certain direction in the body cloth and the plaster cloth held by the cloth presser;
A control device for controlling the cloth presser, the cloth moving mechanism, the needle up-and-down moving mechanism, and the knife mechanism;
The control device is
Controlling the cloth moving mechanism and the needle up-and-down moving mechanism to form a first seam and a second seam;
In a sewing machine that controls the knife mechanism to form a cut between the first seam and the second seam,
A first folding mechanism that folds the placket along the first seam;
A sewing machine comprising: a second folding mechanism that folds the placket along the second seam. The controller is
A first stitch control for controlling the cloth moving mechanism and the needle up-and-down moving mechanism to form the first stitch and the second stitch;
Controlling the first folding mechanism, the first folding control to fold the placket fabric along the first seam;
A first turn-back between the first seam of the front cloth folded by the first turn-back mechanism and the cut formation position by the knife mechanism by controlling the cloth moving mechanism and the needle up-and-down moving mechanism. A second stitching control to form a seam;
Controlling the second folding mechanism, a second folding control for folding the placket fabric along the second seam;
By controlling the cloth moving mechanism and the needle up-and-down moving mechanism, a second fold is formed between the second seam of the front cloth folded by the second fold mechanism and the cut formation position by the knife mechanism. The sewing machine according to claim 1, wherein the third sewing control for forming the seam is executed in order. A third folding mechanism for folding the placket fabric along the second folded seam;
The controller is
A third folding control for controlling the third folding mechanism to fold the placket fabric along the second folding stitch;
3. The sewing machine according to claim 2, wherein the scissor mechanism is controlled to sequentially perform cut formation control for forming a cut at the cut formation positions of the body cloth and the front cloth. 4.   The third folding mechanism includes a front cloth presser that presses the front cloth from above by a lowering operation, and a blower mechanism that is mounted on the front cloth presser and blows air to the front cloth. The described sewing machine. The first folding mechanism includes a front folding plate that reciprocates across the cut formation position by the knife mechanism, an actuator that is a driving source for movement of the front folding plate, and the reciprocating movement of the front folding plate. And a support mechanism for supporting the
The placket folding plate folds the placket cloth along the first seam by the movement of the forward path, and presses the placket cloth folded back along the second seam by the movement of the backward path from above.
The sewing machine according to any one of claims 1 to 4, wherein the support mechanism includes a cam mechanism that moves the forward path of the placket folding plate at a position lower than the movement of the return path. The first folding mechanism includes an auxiliary pressing plate arranged with respect to the front folding plate at the start position of the reciprocating movement with a cut forming position by the knife mechanism interposed therebetween,
The support mechanism is
6. The sewing machine according to claim 5, further comprising an interlocking mechanism that reciprocally moves the auxiliary pressing plate in conjunction with the front folding plate within a range that does not cross a cut forming position by the knife mechanism.   The sewing machine according to any one of claims 1 to 6, wherein the second folding mechanism includes a blowing mechanism that blows air to the placket.

Images