WO2001042550A1 - Eyelet hole linking sewing machine fabric cutting device - Google Patents

Abstract

A sewing machine fabric cutting device capable of forming eyelet holes of various lengths and linear holes without changing a knife and a knife receiver. A sewing machine fabric cutting device (1) provided in a sewing machine (100) for forming button holes in a sewing object (200) and linking the peripheries of the button holes, and provided with a knife (5) for cutting the sewing object (200) in order to form button holes, wherein the knife (5) is provided with an eyelet knife portion (54) for forming an eyelet portion (202) of an eyelet hole (201), out of button holes, consisting of an eyelet portion (202) and a linear portion (203), and a linear knife portion (55) for forming a linear slit capable of serving as the linear portion (203) of the eyelet hole (201). When the linear knife portion (55) and the eyelet knife portion (54) of the knife (5) are integrally moved toward the sewing object (200) to cut the sewing object (200), the eyelet knife portion (54) is disposed above the linear knife portion (55) so that the linear knife portion (55) cuts first followed by the eyelet knife portion (54).

Description

 Mei-shin Thin cloth cutting equipment Technical field

 TECHNICAL FIELD The present invention relates to a cloth cutting device for a sewing machine, which is provided in a sewing machine that performs overlock stitching and forms a hole serving as a button hole in a cloth. Background art

 2. Description of the Related Art In general, an eyelet-hole overlock sewing machine is known as an overlock sewing machine that performs overlock sewing on a button hole portion formed on a cloth (a sewing object). The sewing machine is provided with a cloth cutting device for performing buttonhole sewing and forming a buttonhole in a cloth, and forming a buttonhole (eyelet hole) inside the buttonhole sewing part before or after buttonhole sewing. It has become.

 The eyelet hole buttonhole sewing machine is provided with a needle bar having a sewing needle at a lower end, a needle bar vertical drive mechanism for moving the needle bar up and down, a needle swinging mechanism for swinging the needle bar right and left, and a lower side of the needle bar. The sewing machine is equipped with a looper mechanism and the like, and moves the needle bar up and down and swings the needle left and right for each stitch to perform overlock sewing in cooperation with the looper.

Further, the cloth cutting device includes a scalpel and a scalpel receiver provided to face each other up and down, and in a state where a sewing object is interposed between the scalpel and the scalpel receiver, either the scalpel or the scalpel receiver is used. By moving one of them toward the other, the cloth is cut to form eyelets. Since the buttonhole has a shape that is close to a circle (droplet) and a straight hole (straight), the scalpel is straight with the substantially cylindrical blade that forms the eyelet. The straight blade that forms the part is connected to the same plane on the same plane, and the eyelet and the straight part are almost Cut to form eyelets ing.

 However, the eyelets have different shapes depending on the type of clothes and the positions of the buttonholes in the clothes, etc. When forming eyelets with different shapes, it is basically necessary to replace the scalpel and scalpel holder. Was. Therefore, it is necessary to exchange the scalpel and the scalpel receptacle when simply forming eyelets having different lengths of the straight portions of the eyelets, which is troublesome.

 In addition, this kind of eyelet hole drilling sewing machine may form a so-called flutter hole with holes only in the straight part.In this case, replace the eyelet buttonhole cloth cutter with a flutterhole cloth cutter. I needed to.

 A typical outerwear has both an eyelet for a button hole and a hole for a collar.

 Therefore, an object of the present invention is to provide a sewing machine cloth cutting device that can form eyelets and linear flower holes of various lengths without changing a scalpel and a scalpel holder. Disclosure of the invention

 In order to solve the above problems, according to one aspect of the present invention, the cloth cutting device (1) of the sewing machine includes a buttonhole (200) having an eyelet portion (202) and a linear portion (203). For example, a cloth cutting knife (5) for cutting a workpiece (200) to form an eyelet hole (201) is provided.

 The cloth cutting knife includes an eyelet female part (54) forming an eyelet (round) -shaped hole, and a linear female part (55) forming a linear-shaped hole,

When cutting an object to be sewn by the cloth cutting knife, an eyelet buttonhole can be formed in the object to be sewn using both the eyelet scalpel portion and the straight scalpel portion, and the eyelet-to-eye portion can be sewn to the sewn object. It is characterized in that a straight hole can be formed in the sewn object only with the straight knife section without any action. Here, the formation of the eyelet hole with a scalpel may be performed before the overlock sewing is performed on the workpiece, or may be formed after the overlock sewing is performed.

 As described above, according to the present invention, the eyelet hole is formed by the eyelet female portion and the linear female portion, and then the linear hole is formed by the linear female portion following the eyelet linear portion. Since the straight portion of the eyelet can be extended, an eyelet with a different length of the straight portion can be formed without replacing a scalpel or a scalpel holder.

 If a button hole is formed only with a straight female part, a straight flower hole without an eyelet can be formed. That is, both eyelets and flower holes can be formed without changing the scalpel or scalpel receptacle. In addition, if the button hole is formed by cutting the straight knife portion a plurality of times, the length of the flower hole can be changed without changing the knife or the knife holder.

 In the cloth cutting device of the sewing machine, it is preferable that a part that does not cut the workpiece is provided between the eyelet knife part and the straight knife part of the cloth cutting knife.

 According to the sewing machine cloth cutting device configured as described above, by providing a portion that does not cut the sewn object between the eyelet knife portion and the straight knife portion, an uncut portion of the eyelet portion occurs as described later. At the same time, straight holes can be formed clearly.

If the eyelet female part and the straight female part are not arranged on the same plane, the cloth is cut so that the eyelet part of the eyelet and the linear part are connected by the eyelet female part and the straight female part. In order to form a scalpel, for example, the position of the lower end of the straight female portion on the side of the eyelet female portion and the end of the upper eyelet female portion on the side of the straight female portion are precisely aligned, or these ends are Must be slightly overlapped, making it difficult to form a cloth cutting knife, and increasing the cost of the cloth cutting knife. On the other hand, if the cloth cutting knife is formed so that there is a part that does not cut the sewing material between the eyelet knife part and the straight knife part, the cloth cutting knife can be easily created. Such costs can be significantly reduced. Further, in the cloth cutting device of the sewing machine, when the straight knife portion and the eyelet knife portion of the cloth cutting knife are integrally moved toward the sewing object to cut the sewing object, It is preferable that the eyelet female portion is disposed above the straight female portion so that the eyelet female portion cuts the workpiece after the straight female portion cuts the workpiece.

 According to the cloth cutting device of the sewing machine configured as described above, the movement of the cloth cutting knife portion is stopped when the workpiece comes between the straight knife portion and the eyelet knife portion. Can be formed only. In other words, with an extremely simple configuration in which the eyelet female portion is arranged above the linear female portion, it becomes possible to form an eyelet hole in the work using both the eyelet female portion and the linear female portion, Only by this, a straight hole can be formed in the sewing object, and the same operation and effect as described above can be obtained.

 If the eyelet female part is arranged above the linear female part and the cutting of the linear female part is performed prior to the cutting of the eyelet female part when cutting cloth, the eyelet female part of the female receiver is received. If the part and the part that receives the straight knife part are arranged in the same plane, the straight knife part cannot move any more when the straight knife part hits the knife holder. It is preferable that the cloth held by the presser be cut like a general knife or knife.For example, the blade of the straight knife section is not parallel to the workpiece to be cut. It is preferable that they are oblique. In addition, it is preferable that a groove for receiving the straight knife portion is provided in a portion of the knife receiver that receives the straight knife portion.

 Further, according to a second aspect of the present invention, a cloth cutting device (1) for a sewing machine is separated from an eyelet female part (54) forming an eyelet-shaped hole below the eyelet female part. A cloth cutting knife (5) having a straight knife portion (5 5) arranged to form a straight hole;

From the ascending position, the straight knife portion descends onto the sewing object (200) -the second descent Operating means (2) for selectively raising and lowering the eyelet female portion and the linear female portion from a position and a rising position to a second lowering position where the linear female portion descends onto the workpiece. An eyelet buttonhole can be selectively formed.

 Thus, according to the present invention, the stop height of the cloth cutting knife can be easily changed. Therefore, the formation of the eyelet hole and the formation of the linear hole can be easily switched, and the eyelet hole and the linear hole can be formed on the sewing object with a simple configuration without replacing the cloth cutting knife. It can be formed selectively.

 Further, according to the first aspect of the present invention, the cloth cutting device (1) for the sewing machine is separated from the eyelet female part (54) forming the eyelet-shaped hole below the eyelet female part. A cloth cutting knife (5) having a straight knife portion (5 5) arranged to form a straight hole;

 The first descent position in which the linear knife portion descends on the workpiece (200) from the ascending position and the eyelet knife portion and the linear knife portion descend on the sewing material from the ascending position. An actuating means (2) that can be selectively moved up and down with respect to the position;

 Control means is provided for controlling the operating means so as to lower the cloth cutting knife to the second lowering position at the time of the initial descent and to lower the cloth cutting knife to the first lowering position at the time of the subsequent lowering.

 As described above, according to the present invention, a straight hole can be formed after the eyelet hole is formed. Therefore, by moving the work or cloth cutting knife to any position before descending to the first descending position, the straight part of the eyelet hole can be extended or the part of the eyelet hole that cannot be cut can be removed. Cutting can be performed.

Further, according to a fourth aspect of the present invention, a cloth cutting device (1) for a sewing machine is separated from an eyelet female part (54) forming an eyelet-shaped hole below the eyelet female part. Cloth cutting knife having a straight knife portion (5 5) arranged to form a straight hole The first descent position in which the linear knife portion descends on the workpiece (200) from the ascending position and the eyelet knife portion and the linear knife portion descend on the sewing material from the ascending position. An actuating means (2) that can be selectively moved up and down with respect to the position;

 Moving means for moving the sewing object in the arrangement direction of both knife portions,

 By controlling the operating means and the moving means, the cloth cutting knife is lowered to the second lowering position to form eyelets and straight holes, and then the workpiece is moved by a predetermined length, Thereafter, a control means for lowering the cloth cutting knife to the first lowering position is provided.

 According to the present invention, after forming the eyelet hole, a linear hole can be formed at a predetermined position of the sewing object. Therefore, by moving the workpiece so that the straight female portion descends so as to contact the end opposite to the eyelet side of the straight portion of the eyelet hole formed when lowered to the second descending position. However, the straight portion of the eyelet hole can be extended freely without changing the cloth cutting knife. In addition, by moving the portion that has not been completely cut by the moving means below the straight knife portion, an eyelet with no uncut portion can be formed.

 In the cloth cutting device of the sewing machine, it is preferable that the movement of the sewn object by a predetermined length is a direction and a distance in which the straight female portion descends into the eyelet-shaped hole.

 According to the sewing machine cloth cutting device configured as described above, a linear hole can be formed in the eyelet portion. As a result, the joint between the eyelet and the straight part formed by the straight knife part and the straight knife part of the cloth cutting knife can be cut, and the eyelet part and the straight part are securely connected. Eyelet holes can be formed.

Further, in the cloth cutting device of the sewing machine, it is preferable to perform a plurality of operations of lowering the sewing object by a predetermined length and then lowering the sewing object to the first lowering position. According to the sewing machine's cloth cutting device, multiple linear holes are formed. Can be achieved. Therefore, for example, by moving the workpiece in the direction in which the straight knife portion extends the straight portion, the straight portion of the eyelet can be freely extended to an arbitrary length without replacing the cloth cutting knife.

 Further, in the cloth cutting device of the sewing machine, it is preferable that the movement of the sewn object by a predetermined length is a direction and a distance at which the linear knife portion can continuously form a linear hole.

 According to the cloth cutting device of the sewing machine configured as described above, the straight portion of the eyelet can be freely extended to an arbitrary length.

 In the cloth cutting device of the sewing machine, the movement of the sewing object by a predetermined length may be performed by at least one of the plurality of downward movements to the first descending position. It is preferable that the distance be a direction and a distance that fall into the hole of the shape. According to the sewing machine cloth cutting device configured as described above, since a linear hole is formed in the eyelet portion, if the length of the straight female portion reaches the joint portion between the eyelet portion and the linear portion, the eyelet The shape hole and the straight shape hole can be completely connected. Further, even if the material to be cut is a material that is difficult to cut, the inside of the eyelet can be completely cut.

 Further, according to a fifth aspect of the present invention, a cloth cutting device (1) for a sewing machine is separated from an eyelet female part (54) forming an eyelet-shaped hole below the eyelet female part. A cloth cutting knife (5) having a straight knife portion (55) arranged to form a straight hole;

 The first descent position in which the linear knife portion descends on the workpiece (200) from the ascending position and the eyelet knife portion and the linear knife portion descend on the sewing material from the ascending position. Actuating means for selectively moving up and down to the position;

 Moving means for moving the sewing object in the arrangement direction of both knife portions,

By controlling the operating means and the moving means, the sewing object is moved by a predetermined length, and the cloth cutting knife is lowered to a first descending position to form a linear hole. Control means is provided for returning the sewn product by the predetermined length, and thereafter lowering the cloth cutting knife to the second lowering position.

 According to this invention, after forming the linear hole, the eyelet hole can be formed at substantially the same position as the linear hole. In other words, since the material to be sewn is cut in advance with a straight female part before forming the eyelet hole, the material to be sewn has a high strength, for example, Kepler fiber or a spiral around a general fiber. Even if it is a difficult-to-cut fabric formed using at least one of the warp and weft yarns reinforced with high-strength fibers wound around it, the inside of the eyelet should be completely cut. In addition, the eyelet portion can be formed beautifully by the eyelet female portion. In the cloth cutting device of the sewing machine, it is preferable that the movement of the sewn object by a predetermined length is a direction and a distance in which the straight female portion descends into the eyelet-shaped hole. According to the cloth cutting device of the sewing machine having such a configuration, a linear hole can be formed in advance at a position where the eyelet-shaped hole is formed. Therefore, the difficult-to-cut material can be reliably cut by the eyelet female portion, and the button hole can be formed neatly. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a schematic side view of a partially cut-out eyelet buttonhole sewing machine to which a cloth cutting device according to a first embodiment of the present invention is applied.

 FIG. 2 is a schematic top view in which the eyelet buttonhole sewing machine in FIG. 1 is partially broken.

 FIG. 3 is a schematic front view in which the eyelet buttonhole sewing machine in FIG. 1 is partially broken.

 FIG. 4 is a schematic front view of a part of a sensor showing a mounting structure of a sensor for detecting a position of a cloth cutting knife.

Fig. 5 is a schematic rear view of the eyelet buttonhole sewing machine shown in Fig. 1 with a part cut away. is there.

 6A and 6B are diagrams showing the structure of a scalpel and a scalpel receiver, wherein FIG. 6A is a front view of the scalpel and the scalpel receiver, and FIG.

 FIG. 7 is a top view of the eyelets showing the shape of the eyelets formed.

 FIG. 8 is a flowchart for explaining a first method for forming a hole in a workpiece using the cloth cutting device according to the first embodiment.

 FIG. 9 is a flowchart showing a continuation of FIG.

 FIG. 10 is a flowchart for explaining a second method of forming a hole in a workpiece using the cloth cutting device according to the first embodiment.

 FIG. 11 is a flowchart showing a continuation of FIG. 10.

 FIG. 12 is a top view of the eyelet portion and the straight portion of the eyelet hole showing the shapes of the eyelet portion and the straight portion formed by the scalpel.

 FIG. 13 is a schematic perspective view of the female portion showing the state of the linear portion and the linear female portion when extending the linear portion of the eyelet.

 FIG. 14 is a schematic side view of a partially cut-out eyelet buttonhole sewing machine to which a cloth cutting device according to a second embodiment of the present invention is applied.

 FIG. 15 is a schematic top view in which the eyelet buttonhole sewing machine in FIG. 14 is partially broken.

 FIG. 16 is a schematic front view of the eyelet buttonhole sewing machine in FIG.

 FIG. 17 is a schematic rear view in which the eyelet buttonhole sewing machine in FIG. 14 is partially broken.

 FIG. 18 is a flowchart for explaining a third method of forming a hole in a workpiece using the cloth cutting device according to the second embodiment.

FIG. 19 is a flowchart showing a continuation of FIG. FIG. 20 is a flowchart for explaining a fourth method of forming a hole in a workpiece using the cloth cutting device according to the second embodiment.

 FIG. 21 is a flowchart showing a continuation of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

 An embodiment of a cloth cutting device for a sewing machine according to the present invention will be described below with reference to the drawings.

 <First Embodiment>

 The cloth cutting device 1 includes a bed portion 101 on which an object to be sewn 200 is placed on an upper surface side, a pillar portion 102 rising upward from the bed portion 101, and a pillar portion. The eyelet buttonhole sewing machine 100, which is generally composed of an arm part 103 extending from the part 102 to the bed part 101 along its longitudinal direction, is provided on the body of the sewing machine 100. Cutting knife 5, knife receiver 6 for receiving the knife 5 at the time of cutting, operating means 2 for driving the knife 5 up and down to cut the sewing object 200, cloth (not shown) for transporting the sewing object 200 The control device (control means), which is not shown, controls the operation of the sewing machine including the transfer device (moving means) and the cloth cutting device.

 As shown in FIG. 7, the eyelet hole 201 formed in the sewing object 200 in the sewing machine 100 of this example is formed by a substantially drop-shaped eyelet portion 202 and a straight cut. It consists of a certain straight line portion 203.

The cloth transport device is a so-called well-known cloth feed device. In the eyelet hole buttonhole sewing machine 100, a cloth feed table on which a workpiece 200 is placed and pressed by a presser, and the cloth feed table And a cloth feed mechanism for moving the X-axis in the X-axis direction and the Y-axis direction in a substantially horizontal plane. Then, in a state where the sewn object 200 is separated by the presser into the cloth feeder, the cloth transport device moves the needle position with respect to the sewn object 200 around the portion where the eyelet hole 201 is formed. By moving the sewing object 200 so as to move relatively correspondingly, the overlock sewing around the eyelet hole 201 is performed. It is. And in the present invention, not only at the time of overlock sewing,

Also at the time of forming the fabric 201, the cloth conveying device moves the workpiece 200 as described later, but is structurally the same as a known cloth conveying device. Further, the cloth transport device may be configured such that one of the movements is an arc movement instead of the combination of the movements in the X-axis direction and the Y-axis direction.

 The rotation of the cloth conveying device is controlled by a pulse signal, and the cloth conveying device rotates by a predetermined rotation angle per pulse. The setting of the moving amount of the sewing object 200 by this cloth conveying device is as follows. It is assumed that this is performed by setting the number of pulses in the mode described above.

 Here, the structure of the operating means 2 for driving the knife 5 will be described. As shown in FIGS. 1 to 5, the operating means 2 is roughly composed of a motor 21, a ball screw 24, a link mechanism 31, a drive shaft 35, a drive gear 39 and a linear motion shaft 40. You.

 The motor 21 is fixed to the bead portion 101 of the eyelet hole buttonhole sewing machine 100, and the driving force of the motor 21 is connected to the adjacent ball screw gear via the motor gear 22. It is transmitted to 2 and 3. The ball screw gear 23 is mounted on a substantially vertical ball screw 24, and the motor 21 drives the ball screw 24 to rotate. The ball screw 24 is provided with a bearing 25 attached to the bed portion 101 and a bearing unit 26 attached to the arm portion 103. It is supported rotatably.

 The ball screw 24 is provided with a ball screw nut 27. The ball screw nut 27 can move up and down along the ball screw 24 with the rotation of the ball screw 24. ing. A housing 28 is fixed to the upper part of the ball screw nut 27, and the housing 28 is also fixed to the ball screw 24 by rotating the ball screw 24 together with the ball screw nut 27. Move up and down along.

An LM guide 29 is fixed to the housing 28 as shown in FIG. By inserting the guide shaft 30 into the LM guide 29, the housing 28 and the ball screw nut 27 can move up and down without rotating. As shown in FIGS. 1 and 5, one end of the link mechanism 31 has a link shaft 32a, 3a.

2a, it is rotatably fixed to both side surfaces of the housing 28, and the other end is rotatably fixed to one end of the lever 34 by link shafts 32b, 32b.

Reference numeral 3 denotes a nut for preventing the link shaft 32b from coming off.

 As shown in FIG. 2, the drive shaft 35 is provided with support members 36, 36,

It is rotatably supported substantially parallel to the arm portion 103 by 36 and 36, and is fixed by the C-rings 37 and thrust collars 38 at both ends so as not to move back and forth. The drive shaft 35 rotatably supports the other end of the lever 34 on the pillar 102 side thereof. Further, a lever receiver 35 a is attached to the drive shaft 35 so as to be rotatable integrally with the drive shaft 35, and a part of the lever receiver 35 a is in contact with the lever 34. Driven via the link mechanism 31 described above, when the drive shaft 35 is rotated so that one end is lowered with the fulcrum as the fulcrum, the lever 34 is pressed down by the lever 34 and the drive shaft 35 rotates. It is supposed to. A drive gear 39 is provided on the side of the drive shaft 35 opposite to the pillar 102. As shown in FIG. 3, the drive gear 39 meshes with a rack 41 formed on an upper part of the linear motion shaft 40. When the drive shaft 35 rotates together with the drive shaft 35, the drive gear 39 rotates. The linear motion shaft 40 is moved up and down.

 The linear motion shaft 40 is fixed to the arm portion 103 so that the horizontal position can be adjusted, and is housed in a substantially cylindrical linear metal 42 with the drive gear 39 side cut out. Grooves 4 3, 4 3 extending in parallel to the length direction of the linear motion metal 4 2 are provided at two places on the inner surface of the metal 42, and projections are provided at two places in the circumferential direction on the outer surface of the linear motion shaft 40 Department

44, 44 are movably fitted along the grooves 43, 43 so that they can slide up and down without rotating left and right.

At the lower end of the linear motion shaft 40, a knife mount 51 is provided. The knife 5 is attached to the screw mount 51 by the clamp 52 and the clamp screw 53. The female mounting base 51 is mounted so as to be vertically adjustable with respect to the arm 103. In addition, a knife receiving base 61 is provided in a bed portion 101 directly below the knife 5, and a knife receiver 6 is mounted at a position facing the knife 5.

 As shown in FIGS. 1 and 2, the origin position of the drive shaft 35 is slightly higher than the center of the drive shaft 35 and slightly higher than the direct drive shaft 40 (the direct drive shaft 40 (female 5) is lifted upward). The slit plate 45 for detecting the cutting position and the cutting position (the position where both the straight knife section 55 and the eyelet knife section 54 can cut) is attached, and a sensor for detecting the origin position The sensor 46 for detecting the vicinity of the cutting position 46 is mounted on the arm 103 via sensor mounting plates 48, 48 (see FIG. 4). The sensors 46 and 47 detect, for example, a change between a state covered by the slit plate 45 and a state not covered by the slit plate 45, so that the scalpel 5 is at the origin position or at the cutting position. It is to detect whether or not. Further, the shape of the slit plate 45 is determined according to the rotation angle of the drive shaft 35 at the origin position and the cutting position of the tool 5.

Next, a method of moving the scalpel 5 by the operating means 2 having the above configuration will be described. First, drive Moru 21. When the motor 21 is driven, the ball screw 24 rotates via the motor gear 22 and the ball screw gear 23, and the ball screw nut 27 on the ball screw 24 and the housing 28 are ball-mounted. Lower on screw 2 4. As a result, the link mechanism 31 connected to the housing 28 by the link shaft 32 a also descends, and one end of the lever 34 connected to the link mechanism 31 by the link shaft 32 b is connected. Push down clockwise in FIG. Further, the lever 34 rotates the drive shaft 35 clockwise in FIG. 5 via the lever receiver 35a. When the drive shaft 35 rotates, the drive gear 39 provided on the drive shaft 35 rotates in the counterclockwise direction in FIG. 3 together with the drive shaft 35, and meshes with the drive gear 39. The linear motion shaft 40 provided with the rack 41 is lowered, and the knife 5 provided at the lower end of the linear motion shaft 40 is lowered to cut the workpiece 200.

 The rotation of the motor 21 is also controlled by a pulse signal, and rotates by a predetermined rotation angle per pulse. Further, the control device (not shown) is connected to the motor 21 and the control device is connected to a sensor 47 for detecting the vicinity of the cutting position, so that the eyelet female portion 54 of the knife 5 and the straight female portion are connected. The drive of the motor 21 is controlled so that the descent of the knife 5 can be stopped at the second position where both 5 and 5 can cut the workpiece 200, and the motor 21 is controlled. The amount of descent is controlled by the number of pulses to be cut, and only the linear knife part 5 of knife 5 can cut the workpiece 200.Control the drive of motor 21 so that the descent of knife 5 can be stopped at the first position It is supposed to.

 After cutting, the lever 34 is rotated by rotating the motor 21 in the reverse direction to move the ball screw nut 27 and the housing 28 upward, and the lever 34 is pressed against the lever receiver 35a. Is released, and the drive shaft 35 rotates counterclockwise in FIG. 5 by the biasing force of the panel 35 b shown in FIG. 2, and the drive gear 39 rotates clockwise in FIG. The shaft 40 moves up and the knife 5 moves away from the work 200.

 Next, the shapes of the knife 5 and the knife holder 6 will be described with reference to FIG.

As shown in FIG. 6 (a), the scalpel 5 is composed of an eyelet female part 5 4 forming an eyelet part 202 and a linear female part 55 forming a straight part 203. A straight female portion 55 is fixed to 54 with screws 56. The straight female part 55 projects from the eyelet female part 54 in the direction of the opposite female receptacle 6 (downward), and the blade has an oblique shape with one end of the eyelet female part 54 protruding from the other end. I have. On the other hand, the knife receiver 6 has a groove 62 on the side facing the straight knife section 55, into which the straight knife section 55 can be inserted (see Fig. 6 (b)). The opposing side has a flat portion 63 that contacts the eyelet female portion 54. That is, the depth of the groove 6 2 In order to allow the eyelet female part 54 and the flat part 63 to contact each other, the depth is greater than the length from the tip of the blade part of the straight female part 55 to the tip of the blade part of the eyelet female part 54. An interval is provided between the straight female part 55 and the eyelet female part 54, so that there is an uncut portion between the straight part 203 and the eyelet 202. It is as follows.

 The length of the straight female portion 55 is equal to or shorter than the shortest straight portion 203 of the eyelet hole 201 to be formed.

 Further, the eyelet female portion 54 may have a shape that cuts only the eyelet, or may have a shape in which the eyelet has a slightly straight blade.

 The tube 64 shown in FIG. 6 (a) is a tube that blows air for collecting the dust generated when the eyelet portion 202 is formed.

 Further, as described above, since the straight female portion 55 is fixed to the eyelet female portion 54 by the screw 56, the straight female portion 55 can be attached to and detached from the eyelet female portion 54. Yes, when forming an eyelet 201 with a shape that differs only in the length of the straight portion 203, replace the straight female portion 55 instead of extending the straight portion 203 as described later. It is also possible to carry out by doing. Further, when the linear female portion 55 is detachable from the eyelet female portion 54, the eyelet portion 202 formed by the eyelet female portion 54 and the straight line formed by the straight female portion 55 are provided. In order to connect part 203 to the beginning, a high precision is required for the shapes of the eyelet female part 54 and the straight female part 55 and the straight female part to the eyelet female part 54 is required. High accuracy is also required for the attachment of 55, but as described later, if an uncut part is provided between the eyelet part 202 and the straight part 203, and if it is cut later, The eyelet female part 54 and the straight female part 55 can be manufactured relatively easily.

In the vicinity of the knife receiver 6 of the bed portion 101, the above-mentioned known cloth transport device for moving the sewing object 200 along the linear portion 203 formed on the sewing object 200 is provided. (Not shown) is provided. This cloth transport device can move the sewn object 200 along the straight line portion 203 to the eyelet female portion 54 side and the opposite side thereof. When moving to the 4 side, it will be a linear part extension means that extends the linear part 203 of the eyelet hole 201 together with the actuation means 2 as described later, and if it is moved to the opposite side to the eyelet female part 54 As will be described later, together with the actuating means 2, it serves as a re-cutting means connecting between the eyelet portion 202 of the eyelet hole 201 and the linear portion 203.

 The operating means 2 in the straight section extending means and the re-cutting means shall lower the knife 5 to the first position.

 A method of forming a hole in the sewing object 200 using the cloth cutting device provided with the above-described operating means 2, knife 5 and knife receiver 6 will be described with reference to a flowchart.

 "The first way"

FIGS. 8 and 9 are flowcharts illustrating the operation of the first method of forming the eyelets 201 in the sewing object 200. FIG. D, F, L ₁ L ₂ and a in the flowchart are those shown in FIG. 6, where D is the distance from the lower end of the eyelet female part 5 4 of the knife 5 disposed at the origin to the upper surface of the knife receiver 6 , F is the distance from the lower end of the eyelet knife portion 5 4 female 5 arranged on the origin point to the workpiece 2 0 0 top, the entire length of the female 5, L ₂ is a straight female part 5 5 female 5 length A indicates the distance from the lower end of the eyelet female portion 54 to the lower end of the straight female portion 55. Further, as shown in FIG. 13, the length is the length of the portion where the already cut straight portion 203 and the straight knife portion 55 overlap. In the flowchart, the movement amounts S and _Sls S ₂ of the workpiece ₂₀₀ and the descent amount D ₂ of the knife 5 are the above-described pulses of the motor 21 of the cloth conveying device or the motor 21 of the operating means 2. It is determined by setting the number.

The sewing object 200 is placed on the bed portion 101 of the sewing machine 100 to start the hole forming operation (step J 1), and is stored in a storage device of control means (not shown) in advance. Perform sewing first (post knife) or form holes first based on the set information (Step J2). If the knife is the leading knife, the sewing machine 200 moves the sewing object 200 to the cloth cutting position (step J6). On the other hand, in the case of the rear knife, since sewing is performed before forming the hole, the workpiece 200 is moved to the sewing position by the cloth transfer device (step J3), and sewing is performed (step J4). . Then, after the sewing is completed (Step J5), the workpiece 200 is moved to the cloth cutting position by the cloth transport device (Step J6). During this time, the linear motion shaft 40 provided with the knife 5 at the lower end is stopped in a state of rising upward (origin position).

 Next, the descent of the knife 5 is started (step J7), and it is determined whether or not the eyelet knife 54 of the knife 5 is in contact with the knife receiver 6 and the sensor 47 is turned on (step J8). If sensor 47 does not turn ON, continue to lower knife 5 until it turns ON. When sensor 47 reaches 〇N, raise knife 5 (step J9) and raise it until sensor 46 turns ON (step J10). By the above operation, the knife 5 descends to the second position, so that the eyelet portion 54 and the straight-line knife portion 55 form the eyelet portion 202 and the straight portion 203 on the sewing object 200.

 Since there is an uncut portion between the formed eyelet portion 202 and the straight portion 203, the uncut portion is cut next.

First, the sewn object is fed and moved in the + direction in FIG. 12 by the cloth transport device (step J 11), and the uncut portion between the eyelet portion 202 and the straight portion 203 is directly below the straight female portion 55. Take it to The workpiece 200 at this time is fed within the range where the feed amount S is (I ^ —L ₂ ) -L _e / 2 <S≤L _X -L ₂ , so that the eyelet portion 202 and the straight portion 203 The uncut portion between them can be taken directly below the straight knife section 55. Note that the maximum value 1 ^ 1 L ₂ of the feed amount S is the maximum value assuming 1 ^ <2 L ₂ .

Then, the scalpel 5 is lowered to the first position by the operating means 2 (step J 1 2) o The descent amount D ₂ of the scalpel 5 at this time is set so that (D_a)> D ₂ > F. The number of pulses of the motor 21 is set, so that the knife 5 moves to the first position. And cut the work 200 with only the straight knife 55. Here, in the descent of the scalpel 5, the downward direction is defined as one direction.

 After the knife 5 descends, the knife 5 starts to ascend again (step J13), and then rises until the sensor 46 turns ON (step J14), and returns the knife to the origin.

 By the above operation, the straight eye portion 55 cuts the eyelet portion 202 and the straight portion 203 in a straight line by the straight female portion 55, and the eyelet hole 201 in which the eyelet portion 202 and the straight portion 203 are connected is formed.

 Next, the formed eyelet hole 201 length 1 ^ length L required. It is determined whether the condition is satisfied (Step J15). Length L where length is required. When (L. If not> 1 ^), the formation of the eyelet 201 has been completed, and the overlock stitching (sewing) around the eyelet has been performed first (after the knife) or has been performed. It is determined whether there is no (first female) (step J16). In the case of the leading knife, the workpiece 200 is moved to the sewing position by the cloth transport device (step J17), sewing is performed (step J18), and after the sewing is completed (step J18). 19), formation of the eyelet 201 is completed (Step J20). In the case of the rear knife, since the sewing (overlock sewing) has already been completed, the formation of the eyelet 201 is also completed. (Step On the other hand, when the length is less than the required length L. L .:) extends the straight portion 203 of the eyelet 201.

Required length L. The feed rate n = {(L ₀ -L,) / (L ₂ —hi)} of the sewn object 200 by the cloth transport device to obtain 1 N is determined, and it is determined whether the feed rate n is 1 or less. (Step J22). Here, N is the number of times the workpiece 200 is fed (N = 1, 2, 3,...), And is a numerical value that is incremented each time the workpiece 200 is sent.

Incidentally, the teeth - Fei is a predetermined feed amount, and minus the amount of overlap described above monument from the length L ₂ of the straight female part 55, the feed index n, required cut length L. From scalpel It is obtained by subtracting the number of times N already sent at that time from the number of times of feeding obtained by subtracting the total length of 5 from the predetermined feeding amount L ₂ —by the above.

When the feed rate n is greater than 1, the workpiece 200 is fed by the cloth conveying means by the feed amount-{(Lo-L + Nx (L ₂ -a)}} (in one direction in FIG. 12, {(L ₀ —

_{L x) + Nx (L 2} - flight)}) was only sent (step J 23), the drop amount D ₂ Ri by the actuation means 2, the female until the (D-a)> D _2> F Lower 5 (Step J 24). By this step J24, the knife 5 descends to the first position, cuts the sewing object 200 only with the straight knife portion, and extends the straight portion by the length of the substantially straight knife portion. Then, the knife 5 starts to rise (Step J25), and returns the knife 5 to the home position where the sensor 46 turns ON (Step J26).

 The above operation is performed until the feed rate n becomes 1 or less.

When the feed rate n is less than 1, the workpiece 200 is moved by the cloth conveying means by the feed amount S ₂ = — nx (L ₂ —）) (one direction nx (L ₂ひ) in FIG. 12). is sent (step J 27), the actuating means 2 is drop D _2, to _{(D- a)> D 2>} F and until (to first position) descent female 5 (step J 28). Thus, the scalpel 5 can cut the workpiece 200 only with the straight knife portion 55, and extend the straight portion with a length shorter than the length of the straight knife portion 55. Then, lift knife 5 (step J29) and return knife 5 to the home position where sensor 46 turns ON (step J30).

With the above operation, the cutting of the eyelet 201 of the required length is completed, and whether the overlock sewing (sewing) around the eyelet has been performed first (back knife) or not (first knife) Is determined (step J31). In the case of the leading knife, the work 200 is moved to the sewing position by the cloth transport device (step J32), sewing is performed (step J33), and after this sewing is completed (step J34), The formation of the hole 201 is completed (Step J35). If it is a post-scalpel, Since the production (overcasting) has been completed, the formation of the eyelet hole 201 is also completed (step J36).

 "Second method"

FIGS. 10 and 11 are flowcharts for explaining the operation of the second method of forming the eyelet hole 201 in the sewn object 200, wherein D, F, L _1N L ₂ , a and are shown in Fig. 6 and Fig. 12, D is the distance from the lower end of the eyelet female part 54 of the scalpel 5 placed at the origin to the upper surface of the knife receiver 6, and F is the origin the distance from the lower end of the eyelet knife portion 5 4 female 5 until the workpiece 2 0 0 top, 1 ^ is the total length of the female 5, L ₂ is the length of the straight female part 5 5 female 5, L _E female 5 The length of the eyelet female portion 54 of “a” indicates the distance from the lower end of the eyelet female portion 54 to the lower end of the straight female portion 55. Further, as shown in FIG. 13, the length is the length of the portion where the already cut linear portion 203 and the straight female portion 55 overlap.

In addition, the movement amounts S, S ₁ S ₂ of the workpiece ₂₀₀ and the descent amount D ₂ of the knife 5 in the flowchart are also the same as those of the motor 21 of the cloth conveying device or the motor 21 of the operating means 2. It is determined by setting the number.

 First, similarly to the first method, the workpiece 200 is placed on the bead portion 101 of the sewing machine 100 to start the hole forming operation (step J40), and the control means (not shown) is used. Based on the setting information previously set and stored in the storage device at the stage, it is determined whether it is the leading knife or the trailing knife (step J41). If the knife is the leading knife, the sewing object 200 is moved to the cloth cutting position by the cloth transport device (step J45). In the case of a rear knife, first, the workpiece 200 is moved to the sewing position ^ by the cloth transport device (step J42), sewing is performed (step J43), and sewing is completed (step J44). Later, the cloth is moved to the cloth cutting position by the cloth transport device (step J45). During this time, the knife 5 is stopped in a state of rising upward (origin position).

Next, the sewing object is fed and moved in the + direction in FIG. 12 by the / [J transport device (step knob J46). At this time, the feed amount S of the workpiece 200 is (I — L ₂ )-L _E / 2 <3≤1 ^ - is intended to be within the scope of the L _2, by this, the workpiece 200, the portion to be between the eyelet 202 and the straight portion 203 to be formed in a later step is female 5 It moves so as to be directly below the straight knife portion 55, and the end of the straight knife portion 55 on the eyelet knife portion 54 side does not protrude from the eyelet portion 202 formed thereafter. Na us, the maximum one L ₂ of the feed amount S is the maximum value, assuming that <2 L _2. And by the operation unit 2 after lowering the knife 5 to the first position (drop D ₂₎ (step J 47), raising the female 5 (step J 48) ₀ Female 5 rise sensor 46 and ON (Step J 49) and return knife 5 to the origin. Drop D ₂ of main scan _{5, (D- a)> D 2} > F and is set to be, the Rimesu 5 by to drop to the first position, the only straight female portion 55 Press the sewing product 200. Here, when the scalpel 5 descends, the descending direction is defined as one direction. By the above operation, the contact portion between the eyelet portion 202 and the linear portion 203 is cut off first before the eyelet portion 202 and the straight portion 203 are cut and formed. After returning the sewing object 200 to the cloth cutting position again (step J50), the knife 5 is lowered (step J51). The knife 5 is lowered until the knife 5 descends to the second position, the eyelet female portion 54 of the knife 5 contacts the knife receiver 6, and the sensor 47 is turned on (step J52). Then, the knife 5 is raised (Step J53), and stops when the sensor 46 is turned on (Step J54).

 By the above operation, the eyelet portion 202 and the straight portion 203 are cut and formed at the same time, and the eyelet hole 201 in which the eyelet portion 202 and the straight portion 203 are connected is formed.

Next, the formed eyelet hole 201 length 1 ^ length L required. Is determined (step J55). If the length is the required length L ₀ (L. If not> 1 ^), the formation of the eyelet 201 has been completed and the overlock sewing around the eyelet has been performed first. A determination is made as to whether (rear knife) or not (first knife) (step J56). In the case of the leading knife, the workpiece 200 is moved to the sewing position by the cloth transport device (step J57), and the sewing is performed (step S57). (Step J58) After the sewing is completed (Step J59), the formation of the eyelets 201 is completed (Step J60). In the case of the rear knife, since the sewing (overcasting) has already been completed, the formation of the eyelet 201 is also completed (step J6l) o On the other hand, the required length L requires the length L. If less than (1 ^>), extend the straight part 203 of the eyelet 201.

Required length L. To determine the feed rate n = {(Lo-Lj / (L ₂ —hi)} — N by the cloth transport device to determine the feed rate n is 1 or less (step J 62) Here, N is the number of times the sewing object 200 is fed (N = 1, 2, 3 ''), and is a numerical value that is incremented each time the sewing object 200 is sent.

When the feed rate n is greater than 1, the amount of the workpiece 200 to be sewn is fed by the cloth conveying means = — {(L. One + NX (L ₂ -a)}} (in one direction in FIG. 12, {(L ₀ — LJ + NX (L ₂ -a)}) (Step J 63), then lower the knife 5 by the actuating means 2 until the lowering amount D ₂ becomes (D—a)> D ₂ > F (Step J64) In this step J64, the knife 5 descends to the first position, cuts the workpiece 200 only with the straight knife portion 55, and extends the straight portion 203 of the eyelet hole 201. Thereafter, the knife 5 starts to be lifted (step J65), and is raised until the sensor 46 is turned on (step J66).

 The above operation is performed until the feed rate n becomes 1 or less.

When the feed rate n is smaller than 1, the workpiece 200 is fed by the cloth conveying means by the feed amount S ₂ = -n (L ₂ -h) (in one direction in Fig. 12 nx (L ₂ -h)). Then, the knife 5 is lowered (to the first position) by the actuation means 2 until the descent amount D ₂ becomes (D−a)> D ₂ > F (step J 68). Thereby, it is possible to extend the length shorter than the length of the straight knife portion 55. Then, the knife 5 is raised (Step J69), and the knife is returned to the home position where the sensor 46 is turned on (Step J70). With the above operation, the cutting of the eyelet hole 201 of the required length is completed, and the overlock stitching (sewing) around the eyelet hole has been performed first (back knife) or not performed (first knife) ) Is determined (step J71). In the case of the leading knife, the workpiece 200 is moved to the sewing position by the cloth transport device (step J72), sewing is performed (step J73), and after the sewing is completed (step J74). ) The formation of the eyelet 201 is completed (Step J75). In the case of the rear knife, since the sewing (overlock stitching) has already been completed, the formation of the eyelet hole 201 is also completed (step J76) o

 In this embodiment, the length L is Lc ^ L for the female 5 having a total length of 1 ^. Only eyelet holes can be formed. Therefore, in the first and second methods described above, it is assumed that the formation of the eyelets is performed using a scalpel shorter than the entire length of the eyelets.

 In addition, when forming a flower hole (parallel hole) formed only with a straight hole instead of an eyelet hole 201, do not lower the scalpel 5 to the second position, and move the scalpel 5 to the first position. A straight hole is formed only by descent. When the length of the straight hole is less than the required length, a cloth conveying device is used similarly to the method of extending the straight portion 203 of the eyelet hole 201 in the first method and the second method. Then, move the workpiece 200 along the straight hole and place the end of the straight hole directly below the end of the straight female part 55 on the side of the eyelet female part 54. Lower the knife 5 to the first position by means 2. This operation is repeated until the straight hole has the required length.

 If the extension length of the straight portion 203 is less than the length of the straight knife portion 55 (feed rate n is less than 1), the blade of the straight knife portion 55 is slanted as described above. Therefore, the cutting may be performed by adjusting the amount of descent of the knife 5 to adjust the cutting depth of the straight knife portion 55 when cutting the workpiece 200.

In the first method, either of the connection between the straight portion 203 and the eyelet portion 202 and the extension of the straight portion 203 may be performed first. In addition, in the case where cutting is performed repeatedly to create one hole as described above, the knife 47 does not move to the home position for each cut, and the sensor 47 that detects the vicinity of the cutting position provides a straight knife section. It is only necessary to raise the female to a position where 5 5 is completely removed from the workpiece 200.

<Second embodiment>

 The cloth cutting device according to the present embodiment is the same as the cloth cutting device according to the first embodiment except for a sensor mechanism for controlling the movement of the scalpel. The description is omitted by attaching the same reference numerals as in FIGS.

 The sensor mechanism for controlling the movement of the knife in the present embodiment is provided on the housing 28 and the pillar 102 of the operating means 2 for moving the knife 5 up and down.

 As shown in FIGS. 15 and 17, the housing 28 is provided with a slit plate 49, and the pillar 102 is provided with a sensor 50 for detecting the home position. Have been. The sensor 50 detects whether or not the knife 5 is at the origin position, for example, by detecting a change between a state where the slit plate 49 is covered and a state where it is not covered. When the motor 21 is driven, the slit plate 49 covering the sensor 50 moves together with the housing 28, so that the sensor 50 is not covered. The point at which the slit plate 49 covers the sensor 50 is set as the origin position. Thereafter, the vertical movement of the knife 5 is controlled by the number of pulses of the motor 21.

 The detection of the origin by the sensor 50 and the slit plate 49 may be performed every time the knife 5 is moved up and down. In this embodiment, a series of cloth cutting operations by the cloth cutting device 1 is started. It shall be performed when doing.

 A method of forming a hole in the sewing object 200 using the cloth cutting device having the above-described sensor mechanism and the like will be described with reference to a flowchart.

 "Third method"

FIGS. 18 and 19 show a third method of forming an eyelet hole 201 in a sewn object 200. 5 is a flowchart for explaining the operation of FIG. D, F, L _ls L ₂ and a in this flowchart are those shown in FIG. 6, and D is the distance from the lower end of the eyelet female part 54 of the scalpel 5 disposed at the origin to the upper surface of the scalpel receiver 6 , F is the distance from the lower end of the eyelet female portion 54 of the female 5 arranged in the origin to the workpiece 200 top surface, 1 ^ is the total length of the female 5, L ₂ is the length of the straight female portion 55 of the female 5, a Indicates the distance from the lower end of the eyelet female portion 54 to the lower end of the linear female portion 55. Also, as shown in FIG. 13, the length is the length of the portion where the already cut straight portion 203 and the straight knife portion 55 overlap.

Further, the movement amount S of the workpiece 200 in the flowchart, Si, S ₂ and, rise and drop of DD ₂ female 5, number of pulses mentioned above Meaux evening 21 Meaux evening or actuating means 2 of the fabric conveying device It is determined by setting.

 The sewing object 200 is placed on the bed 101 of the sewing machine 100 to start the hole forming operation (step J101), and the leading knife is set based on the setting information previously set and stored in the storage device of the control means (not shown). (Step J102) If the knife is the leading knife, move the sewing object 200 to the cloth cutting position by the cloth transport device (Step J106). On the other hand, in the case of the rear knife, the sewing object 200 is moved to the sewing position by the cloth transfer device (step J103) to perform sewing before forming the hole (step J103), and the sewing (overlock sewing) is performed ( Step J 104). After the sewing is completed (step J105), the workpiece 200 is moved to the cloth cutting position by the cloth transport device (step J106). During this time, the knife 5 is stopped in a state of being raised upward (origin position).

Next, the scalpel 5 is lowered to a second position (amount D) at which the straight knife portion 55 and the eyelet knife portion 54 cut the workpiece 200 (step J107). Thereafter, the knife 5 is raised (Step J108), and the knife 5 is separated from the workpiece 200. At this time, the rising amount of the knife 5 is in the range of 0 <D <F—a. For the above operation As a result, the eyelet female part 54 and the straight female part 55 form the eyelet part 202 and the linear part 203 on the sewn product 200. The scalpel 5 moves downward in one direction.

 Since there is an uncut portion between the formed eyelet portion 202 and the linear portion 203, the uncut portion is cut next.

First, the work to be sewn is moved in the + direction in FIG. 12 by the cloth transport device (step J109), and the uncut portion between the eyelet portion 202 and the straight portion 203 is moved. Is brought directly below the straight female section 5 5. At this time, the workpiece 200 is fed within the range where the feed amount S is (one L ₂ ) —L _e / 2 and SI ^ —L ₂ . The uncut portion between 0 and 3 can be taken directly below the straight knife portion 55. Incidentally, the maximum value when the maximum value 1 ^ one L ₂ feed amount S and Ku 2 L ₂ was assumed.

Then, the knife 5 is lowered to the first position by the operating means 2 (step J110). Drop D ₂ female 5 at this _{time, (D- a)> D 2} > F and so as the number of pulses of the motor evening 2 1 of the working hand stage 2 is set, thereby knife 5 first And cut the sewing object 200 only with the straight knife section 55.

 After the knife 5 descends, raise the knife 5 again (step J111). The amount of rise of the knife 5 at this time is O Dz F—a, whereby the straight knife portion 55 can be pulled out of the sewing object 20 °.

 By the above operation, the straight female portion 55 cuts straight between the eyelet portion 202 and the straight portion 203, and the eyelet hole 205 where the eyelet portion 202 and the straight portion 203 are connected. 0 1 is formed.

Next, the formed eyelet hole 201 length L, the required length L. It is determined whether or not it has reached (Step J 1 1 2). Length L where length is required. When (L.> L, not), the formation of the eyelet 201 is completed, and the overlock stitching (sewing) around the eyelet is performed first (back knife). Not (first female) Is determined (step J 113). In the case of the leading knife, the workpiece 200 is moved to the sewing position by the cloth transport device (step J114), sewing is performed (step J115), and after the sewing is completed (step J116) The formation of 201 is completed (Step J 117). In the case of the rear knife, since the sewing (overlock sewing) has already been completed, the formation of the eyelet 201 is also completed (step J118).

 On the other hand, the length L where the length is required. If it is less than 1 (if 1 ^> 1 ^), extend the straight part 203 of the eyelet 201.

Required length L. Feed rate n = {(L. one L) / (L ₂ -hi)} — N of cloth to be sewn by the cloth transport device to obtain N, and determine whether the feed rate n is 1 or less. (Step J 119). Here, N is the number of times the workpiece 200 is fed (N = 1, 2, 3,...), And is a numerical value that is incremented each time the workpiece 2 • 0 is sent.

When the feed rate n is greater than 1, the workpiece 200 is fed by the cloth conveying means at a feed amount S _{1 =} — {(Lo-Lj + NX (L ₂ —hi)}} (in one direction in FIG. 12, {(L ₀ — L】) + Nx (L ₂ —hi)}) (Step J 120), and then the descent amount D ₂ by the actuation means 2 until (D—a)> D ₂ > F Lower the knife 5 (Step J121) In this step J121, the knife 5 descends to the first position, cuts the workpiece 200 only with the straight knife, and cuts the workpiece 200 by the length of the substantially straight knife. Then, the scalpel 5 is raised by the rising amount that becomes O Di F-a (Shunp J 122).

 The above operation is performed until the feed rate n becomes 1 or less.

When the feed rate n is smaller than 1, the workpiece 200 is moved by the cloth conveying means so that the feed amount S ₂ = — nx (L ₂ —hi) (nx (L ₂ -a) in one direction in FIG. 12). feed is (step J 123), drop D ₂ force by the actuation means 2 (D- a)> 1) ,> F and until (up to the first location) drop female 5 (step J 124), this Thus, the knife 5 can cut the workpiece 200 with only the straight knife portion 55 and extend the straight portion with a length shorter than the length of the straight knife portion 55. Then, the knife 5 is raised (Step J125), and the knife 5 is pulled out of the sewing object 200. The amount of rise of the knife 5 at this time is set so that Di <F.

 With the above operation, the cutting of the eyelet hole 201 of the required length is completed. After that, it is determined whether overlock sewing (sewing) around the eyelet hole has been performed (back knife) or not (first knife) (step J1226). The workpiece 200 is moved to the sewing position by the transfer device (Step J127), sewing is performed (Step J128), and after the sewing is completed (Step J129), the eyelet 20 The formation of 1 is completed (step J130). In the case of the rear knife, since the sewing (overlock sewing) has already been completed, the formation of the eyelet hole 201 is completed (step J131).

 "Fourth method"

FIGS. 20 and 21 are flowcharts for explaining the operation of the fourth method of forming the eyelet hole 201 in the sewn object 200, wherein D, F, L ₁ L ₂ , a and _Le are also shown in Fig. 6 and Fig. 12, D is the distance from the lower end of the eyelet female part 54 of the knife 5 placed at the origin to the upper surface of the knife receiver 6, and F is located at the origin The distance from the lower end of the eyelet female part 5 4 of the scalpel 5 to the upper surface of the workpiece 200, is the total length of the scalpel 5, L ₂ is the linear female part 5 of the scalpel 5 5, and _Le is the scalpel 5 The length of the eyelet female portion 54 of “a” indicates the distance from the lower end of the eyelet female portion 54 to the lower end of the straight female portion 55. Further, as shown in FIG. 13, the length is the length of the portion where the already cut linear portion 203 and the straight female portion 55 overlap.

Further, the movement amount S of the workpiece 2 0 0 in this flowchart, S ,, S _2, and, rise and drop of D ,, D ₂ female 5 also, mode one mode evening or actuating means 2 of the fabric conveying device It is determined by setting the number of pulses in the evening 21. First, in the same manner as the third method, the sewing object 20 is placed on the bead portion 101 of the sewing machine 10 (). 0 is arranged to start the hole forming operation (step J140), and the control means determines whether it is the leading knife or the trailing knife based on the setting information (step J141). In the case of the leading knife, the sewing object 200 is moved to the cloth cutting position by the cloth conveying device (step J145). If it is a post-scalpel, first, the workpiece 200 is moved to the sewing position by the cloth transfer device (step J142), sewing is performed (step J143), and after the sewing is completed (step J144), the cloth 200 is sewn. Move to the cloth cutting position by the transfer device (Step J 145). During this time, the knife 5 is stopped in a state of rising upward (origin position).

Next, the work to be sewn is fed and moved in the + direction in FIG. 12 by the cloth transport device (step J146). At this time, the feed amount S of the work 200 is assumed to be in the range of (I ^ —LJ-L _e / 2 and S≤Li—L ₂ , whereby the work 200 is The part between the formed eyelet 202 and the straight part 203 is moved so that it is directly below the straight knife 55 of the scalpel 5, and the end of the straight knife 55 on the side of the eyelet 54 becomes It does not protrude from the formed eyelet 202. The maximum value of the feed amount S ;; is the maximum value assuming 2 L _2. Then, the knife 5 is moved to the first position by the operating means 2. position after (drop D ₂₎ to descend (step J 147), raising the female 5 causes (increase amount D!) (step J 148). drop of D ₂ female 5, (D-a)> It is set so that D ₂ > F, whereby knife 5 descends to the first position, and cuts the workpiece 200 only at the straight knife portion 55. In addition, the rise amount is 0 and D < It is set to be F-a.

By the above operation, the contact portion between the eyelet portion 202 and the linear portion 203 is cut off first before the eyelet portion 202 and the straight portion 203 are cut and formed. After returning the work 200 to the cloth cutting position again (step J149), the knife 5 is lowered (step J150). At this time, let D be the amount of descent of knife 5, so that knife 5 descends to the second position. Then, raise the scalpel 5 by the amount (0 <D ! <Fa) (Step J 151), and pull out the knife 5 again from the workpiece 200.

 By the above operation, the eyelet portion 202 and the straight portion 203 are cut and formed at the same time, and the eyelet hole 201 in which the eyelet portion 202 and the straight portion 203 are connected is formed.

Next, the formed eyelet hole 201 length 1 ^ length L required. Is determined (step J152). Length L where length is required. When ( ₀ > 1 ^ is not satisfied), the formation of the eyelet 201 is completed, and it is determined whether the eyepiece is the rear knife or the first knife (step J153). In the case of the leading knife, the workpiece 200 is moved to the sewing position by the cloth transfer device (step J154), and the sewing is performed (step J155). After the sewing is completed (step J156), the eyelet hole is formed. The formation of 201 is completed (Step J 157). In the case of a post-scalpel, sewing (overcasting) has already been completed, so that formation of the eyelet 201 is also completed (step J158).

 On the other hand, the length L where the length is required. If it is less than (ί.>! ^), The straight line portion 203 of the eyelet 201 is extended.

Required length L. To determine the feed rate n = {(Lo-L,) / (L ₂ —hi)} — N of the sewn object 200 by the cloth transport device to determine the feed rate n is 1 or less. (Step J 159). Here, N is the number of times the workpiece 200 is fed (N = 1, 2, 3,...), And is a numerical value that is incremented each time the workpiece 200 is sent.

When the feed rate n is greater than 1, the amount of the workpiece 200 to be sewn by the cloth conveying means = — {(L. One + Nx (L ₂ —hi)} (in one direction in FIG. 12 {(L. one + Nx (L ₂ —hi)}) (Step J 160), then lower the knife 5 by the actuating means 2 so that the descent amount D ₂ becomes (D—a)> D ₂ > F (Step J 160) J 161) In this step J161, the knife 5 descends to the first position, cuts the sewing object 200 only with the ill line knife 55, and cuts the straight portion 203 of the eyelet hole 201. Extend. Then, raise the scalpel 5 so that the rising amount becomes ODF-a (step J162).

 The above operation is performed until the feed rate n becomes 1 or less.

When the feed rate n is smaller than 1, the workpiece 200 is fed by the cloth conveying means by the feed amount S ₂ = −nx (L ₂ —hi) (one direction nx (L ₂ —hi) in FIG. 12). Then, the knife 5 is lowered (to the first position) by the actuation means 2 until the descent amount D ₂ becomes (D−a)> D ₂ > F (step J 164). Thereby, it is possible to extend the length shorter than the length of the straight knife portion 55. After that, the knife 5 is raised so that the rising amount becomes Di <F (Step J165), and the knife 5 is separated from the sewing object 200.

 With the above operation, the cutting of the eyelet 201 of the required length is completed, and whether the overlock sewing (sewing) around the eyelet has been performed first (back knife) or not (first knife) Is determined (step J166). In the case of the leading knife, the workpiece 200 is moved to the sewing position by the cloth transport device (Step J167), sewing is performed (Step J168), and after the sewing is completed (Step J169), the eyelet hole is formed. The formation of 201 is completed (Step J 170). In the case of the rear knife, since the sewing (overlock sewing) has already been completed, the formation of the eyelet hole 201 is also completed (step J171).

 In this embodiment, the length L is 1 ^ ≥1 ^ for the scalpel 5 having a total length of 1 ^. Only eyelet holes can be formed. Therefore, in the third and fourth methods described above, it is assumed that the formation of the eyelets is performed using a scalpel shorter than the entire length of the eyelets.

When forming a flower hole formed only with a straight hole instead of the eyelet hole 201, only a straight hole is formed only by descending to the first position. When the length of the straight hole is less than the required length, the cloth conveying device is used in the same manner as when the straight portion 203 of the eyelet hole 201 is extended in the third and fourth methods. Then, the workpiece 200 is moved along the straight hole using the, and the end of the straight hole is placed immediately below the end of the straight knife portion 55 on the eyelet knife portion 54 side. Then, the knife 5 is lowered to the first position by the operating means 2. This operation is repeated until the straight hole has the required length.

 If the extension length of the straight portion 203 is less than the length of the straight knife portion 55 (feed rate n is less than 1), the blade of the straight knife portion 55 is slanted as described above. Therefore, the cutting may be performed by adjusting the amount of descent of the knife 5 to adjust the cutting depth of the straight knife portion 55 when cutting the workpiece 200.

 Further, in the third method, either of the connection between the linear portion 203 and the eyelet portion 202 and the extension of the linear portion 203 may be performed first.

 As described above, according to the sewing machine cloth cutting device of the above embodiment, the scalpel 5 is composed of the straight female portion 55 and the eyelet female portion 54, and the straight female portion 55 is formed by the eyelet female portion 54. By protruding toward the scalpel receiver 6, the eyelet hole 201 and the linear parallel hole can be formed by one scalpel, so that it is possible to save the trouble of replacing the scalpel.

 The provision of the straight section extending means by the cloth conveying device and the operating means 2 allows the formation of the eyelets 201 and the parallel holes having different lengths of the straight section 203 without replacing the knife receiver 6. it can. In addition, the provision of the re-cutting means by the cloth conveying device and the operating means 2 makes it possible to cut portions that cannot be cut at once, such as between the eyelet portion 202 and the straight portion 203. It is.

 In addition, by cutting the inside of the eyelet portion 202 with the straight female portion 55, it is possible to pass the button through the eyelet hole even if the eyelet portion 202 cannot be completely cut by the eyelet female portion 54. Become.

In addition, by inclining the blade of the straight knife section 55, the workpiece 200 is sheared and shrunk, and by adjusting the descending amount of the knife 5, the straight knife section 55 can be cut one time. The length that can be cut can be shortened. Furthermore, by providing sensors 46, 47, 50 to detect the position of knife 5, and by controlling the amount of movement of knife 5 by the number of pulses of module 21, the knife 5 can be moved to an appropriate position. Since it can be stopped and unnecessary movement can be prevented, it is possible to shorten the creation time.

 Further, since the straight female portion 55 is cut so as to shear the sewing object 200, it is possible to easily cut a hard-to-cut sewing object such as a cloth in which carbon fibers are wound around a weft thread. Therefore, as shown in the second method and the fourth method, by cutting the sewing object 200 with the straight knife section 55 before cutting the eyelet hole, the sewing object that is hard to cut is cut. In this way, it is possible to easily form the eyelet hole 201. Further, even when such a sewn object cannot be cut by the eyelet knife portion 54, since it has already been cut by the straight knife portion 55, it can serve as a button hole.

 In the above-described embodiment, the straight female portion is integrated with the eyelet female portion by being screwed. However, the present invention is not limited to this. The eyelet female part may be formed integrally.

 Also, the eyelet hole 201 is formed by lowering the eyelet female part and the linear female part integrally from the top, but the eyelet female part and the flat part of the female receiver are exchanged, and the straight female part is replaced. And the flat part may be integrated and lowered from above.

 The structure of the actuating means is also arbitrary, and any structure can be used as long as the knife can be lowered vertically from above.

 In addition, it is needless to say that specific detailed structures can be appropriately changed.

As described above, according to the sewing machine cloth cutting apparatus according to the aspect of the present invention, The scalpel is provided with an eyelet female part forming an eyelet part, and a linear female part forming a linear cut. A eyelet hole is formed by the eyelet female part and the linear female part, and a linear hole is made by the linear female part. By forming the holes, an eyelet hole and a straight button hole having no eyelet portion can be formed without replacing a cloth cutting knife. Further, after the eyelet hole is formed by the eyelet female portion and the straight female portion by the straight female portion, the straight portion of the eyelet portion can be extended.

 In addition, by providing a portion that does not cut the sewing material between the eyelet knife portion and the straight knife portion, a cloth cutting knife composed of the eyelet knife portion and the straight knife portion can be easily formed. The cost of creation can be greatly reduced. In addition, since the eyelet portion and the straight portion can be formed beautifully, a beautiful eyelet hole can be formed.

 Further, the eyelet female portion is disposed above the straight knife portion, and the straight female portion cuts the workpiece first, and then the straight knife portion cuts the workpiece as soon as the eyelet female portion cuts the workpiece. Since the cutting with the eyelet knife is not performed at the same time, the movement of the cloth cutting knife is stopped before the eyelet knife reaches the workpiece, so that only a straight hole can be easily formed. it can.

 Also, according to the sewing machine cloth cutting device according to the second aspect of the present invention, only the linear knife portion of the cloth cutting knife cuts the workpiece by the operating means for moving the knife to cut the cloth. The sewing machine can be stopped at any one of the first descending position and the second descending position where the straight knife section and the eyelet knife section cut the workpiece. Therefore, the formation of the eyelets and the formation of the straight holes can be selectively performed with an easy configuration.

Further, according to the sewing machine cloth cutting device according to the third aspect of the present invention, the raising and lowering of the cloth cutting knife by the operating means is lowered to the second lowering position by the control means, and then the first lowering position. The cloth cutting knife forms the eyelet hole, and then forms a straight hole by controlling so as to descend. Therefore, the cloth cutting knife descends to the second descending position. By moving the sewn object or the cloth cutting knife after this, the straight portion of the eyelet can be extended.

 Further, according to the sewing machine cloth cutting device according to the fourth aspect of the present invention, between the descent of the cloth cutting knife to the second lowering position and the lowering to the first lowering position by the operating means, By controlling the moving means to move the sewing object by the control means, a linear hole can be formed at a predetermined position of the sewing object after the eyelet hole is formed. Therefore, by setting the moving direction and the moving amount of the sewn material, it is possible to easily extend the straight portion of the eyelet or to partially cut the eyelet that has not been completely cut. Also, by moving the sewn object in the direction and distance such that the straight female part descends into the eyelet, the length of the straight female part can reach the joint between the eyelet and the linear part. The straight portion can be reliably connected. Further, even if the material to be sewn is a difficult-to-cut material, the inside of the eyelet can be completely cut.

 Further, by moving the sewing object and lowering the cloth cutting knife to the first lowering position a plurality of times, a plurality of linear holes can be formed after the eyelet holes are formed. Therefore, the direction in which the workpiece is moved is such that the straight knife portion extends the straight portion of the eyelet, so that the straight portion of the eyelet can be freely extended to any length without changing the cloth cutting knife. Can be.

 In addition, the direction and distance for moving the workpiece are defined as the direction and distance in which the linear knife section can continuously form a linear hole, so that the movement of the workpiece and the descent of the cloth cutting multiple times are performed multiple times. By doing so, the straight part of the eyelet can be freely extended to any length without changing the cloth cutting knife.

Further, at least one of the plurality of times of descending to the first descending position, the sewing object is moved so that the linear female portion descends into the eyelet portion, so that the linear female portion is moved to the eyelet portion and the linear portion. If the length reaches the joint of the eyelet, the eyelet-shaped hole and the straight-shaped hole can be completely connected. Further, even when the material to be cut is a place where it is difficult to cut the eye, the inside of the eyelet can be completely cut. Further, according to the sewing machine cloth cutting device according to the fifth aspect of the present invention, before the cloth cutting knife is lowered to the second descending position, the sewing machine is moved by the moving means to move the cloth cutting knife. Is lowered to the first lowering position and the position of the sewing object is returned, so that a linear hole is formed at the position where the eyelet hole is formed before the eyelet hole is formed. As a result, it is possible to surely cut the hard-to-cut material, and to form the button holes neatly.

 In addition, by moving the sewn object so that the straight female portion descends into the eyelet portion, a linear hole can be formed at the position where the eyelet portion is formed. Therefore, since the material in the eyelet portion is cut in advance, even the material which is difficult to cut can be reliably cut in the eyelet portion, and the buttonhole can be formed neatly. Industrial applicability

 As described above, the cloth cutting device of the present invention can be widely used for a sewing machine that forms a hole serving as a button hole in a cloth. It is possible to form eyelets and straight holes of various lengths without changing scalpels and scalpel holders.

Claims

The scope of the claims 1. A sewing machine with a cloth cutting knife for cutting a workpiece to form a buttonhole consisting of an eyelet portion and a straight line portion,  An eyelet female part, wherein the cloth cutting knife forms an eyelet (round) -shaped hole;  With a straight knife section that forms a straight hole,  When cutting an object to be sewn by the cloth cutting knife, an eyelet button hole can be formed in the object to be sewn using both the eyelet scalpel portion and the straight scalpel portion, and the eyelet-to-sewn portion is sewn to the sewn object. A sewing machine cloth cutting device characterized in that a straight hole can be formed in a workpiece with only a straight knife section without any action.  2. The sewing machine cloth cutting device according to claim 1, wherein a portion that does not cut the workpiece is provided between the eyelet knife portion and the straight knife portion of the cloth cutting knife. 3. When cutting the sewn object by moving the straight scalpel portion and the eyelet scalpel portion of the cloth cutting knife together toward the sewn object, the straight scalpel portion first cuts the sewn object. The cloth cutting device for a sewing machine according to claim 1, wherein, after cutting, the eyelet knife portion is disposed above the linear knife portion so that the eyelet knife portion cuts the workpiece. .  4. A cloth cutting knife having an eyelet-shaped hole forming a hole in the shape of an eyelet, and a straight-lined knife portion disposed below and spaced apart from the eyelet-shaped knife to form a hole in the shape of a straight line; The eyelet knife and the straight knife can be selectively moved up and down from a first descending position where the knife part descends on the work and a second descending position where the straight knife part descends on the work from the ascending position. Operating means, and  A cloth cutting device for a sewing machine, wherein a straight buttonhole and an eyelet buttonhole can be selectively formed. 5. A cloth cutting knife having an eyelet female part forming an eyelet-shaped hole and a linear female part arranged below and spaced apart from the eyelet female part to form a linear hole, A first descending position in which the straight knife portion descends onto the workpiece from the ascending position and a second descending position in which the eyelet knife portion and the linear knife portion descend on the workpiece from the ascending position Actuating means that can be moved up and down  A sewing machine comprising: control means for controlling an operating means so as to lower the cloth cutting knife to a second lowering position at the time of an initial descent, and to lower the cloth cutting knife to a first lowering position at a subsequent lowering. Cloth cutting equipment.  6. A cloth cutting knife having an eyelet-shaped female portion forming an eyelet-shaped hole, and a linear female portion disposed below and spaced apart from the eyelet-shaped female portion to form a linear-shaped hole; The eyelet knife portion and the straight knife portion can be selectively moved up and down from a first descending position where the knife portion descends onto the workpiece and a second descending position where the straight knife portion descends onto the workpiece from the ascending position. Actuating means,  Moving means for moving the sewing object in the arrangement direction of both knife portions,  By controlling the operating means and the moving means, the cloth cutting knife is lowered to the second lowering position to form eyelets and straight holes, and then the workpiece is moved by a predetermined length, The sewing machine is further provided with control means for lowering the cloth cutting knife to a first lowered position.  7. The cloth cutting device for a sewing machine according to claim 6, wherein the movement of the sewn object by a predetermined length is a direction in which the straight female portion descends into the eyelet-shaped hole and a distance. 7. The sewing machine according to claim 6, wherein the operation of moving the workpiece to a predetermined length and thereafter lowering the workpiece to the first lowering position is performed a plurality of times. 9. The sewing machine according to claim 8, wherein the movement of the sewn object by a predetermined length is a direction and a distance in which the straight female portion can continuously form a linear hole. . 10. Movement of the sewing object by a predetermined length, at least one descent among the plurality of descents to the first descent position, the straight female portion descends into the eyelet-shaped hole 9. The cloth cutting device for a sewing machine according to claim 8, wherein the direction and the distance are different. 1 1. A cloth cutting knife having an eyelet-shaped female portion forming an eyelet-shaped hole, and a straight-lined female portion disposed below and spaced apart from the eyelet-shaped female portion to form a linear-shaped hole; The eyelet knife and the linear knife can be selectively raised and lowered from the first descending position where the straight knife part descends on the work and the second descending position where the straight knife part descends on the work from the ascending position. Operating means,  Moving means for moving the sewing object in the arrangement direction of both knife portions,  By controlling the operating means and the moving means, the sewing object is moved by a predetermined length, and the cloth cutting knife is lowered to the first lowering position to form a linear hole, and then the sewing object is moved. And a control means for lowering the cloth cutting knife to a second lowering position thereafter.  12. The sewing machine according to claim 11, wherein the movement of the sewn object by a predetermined length is a direction and a distance at which the straight female portion descends into the eyelet-shaped hole.