JP2008295742A - Buttonholing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate a work for positioning a workpiece concerning a buttonholing machine including a cloth cutting mechanism for forming a cut for a buttonhole. <P>SOLUTION: A buttonholing machine 1 includes: a cloth feeding mechanism 10 feeding a cloth mounted on a mounting table 11 in a prescribed direction; the cloth cutting mechanism 20 having a cutter receiver 27 and a cloth cutter 21, which are arranged so as to be vertically face each other by holding the mounting table 11, and a cloth cutting pulse motor 26 for vertically driving the cutter receiver 27, cutting the cloth, and forming a buttonhole; a needle rocking mechanism to be crossed with the cloth feeding direction by the cloth feeding mechanism 10 so as to rock a needle; and a control part 70 for controlling each of the mechanisms to form the buttonhole on the cloth and to form side stitches along the buttonhole. The buttonholing machine further includes: a camera unit 40 for capturing an image of the cloth mounted on the mounting table 11 from below, and disposed below a cloth mounting surface of the mounting table 11; and an operation panel 50 for displaying the image of the cloth captured by the camera unit 40. A cloth positioning work is facilitated by positioning the cloth while confirming the pattern of the cloth to be displayed on the operation panel 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a buttonhole sewing machine that performs buttonhole sewing on a buttonhole, and more particularly to a holehole sewing machine that includes a cloth cutting mechanism that forms a cut for a buttonhole.

2. Description of the Related Art Conventionally, there is known a buttonhole sewing machine that forms a cut for a button hole on a cloth to be sewn and performs overlock sewing on the cut (see, for example, Patent Document 1).
This buttonhole sewing machine has a pair of eyelet buttonholes (FIG. 22 (a)) formed on a cloth placed on a feed base by means of a pair of cloth cutting knifes and knife receivers (not shown) arranged above and below the cloth. A cloth cutting mechanism for forming a cut for the cloth, and a cloth feeding mechanism for feeding the cloth in the XY direction (horizontal direction) along the shape of the eyelet button hole formed by the cloth cutting mechanism while holding the cloth, A needle swing mechanism that swings a sewing needle (not shown) in a horizontal direction perpendicular to the cloth feed direction by the cloth feed mechanism, and a needle that drives the sewing needle up and down in synchronization with the swing of the sewing needle by the needle swing mechanism A driving mechanism; and a looper mechanism that forms a seam stitch in cooperation with the needle driving mechanism and the needle swinging mechanism. Then, the needle drive mechanism, the needle swing mechanism and the looper mechanism integrally rotate horizontally in accordance with the movement of the cloth by the cloth feed mechanism, so that the stitching is performed along the edge of the eyelet-shaped button hole. ing.

  By the way, for example, when forming a button hole on a cloth having stripes as shown in FIG. 20B or regularly arranged lines as shown in FIG. It is preferred that the button hole be formed so as to be parallel or orthogonal to a line exposed on the so-called body surface side. However, when the above-described conventional buttonhole overlock sewing machine is used, the stitches are formed so that the lower surface side of the cloth placed on the feed base, that is, the surface side in contact with the cloth placement surface of the feed base is the front. Therefore, when placing the cloth on the feed base, set the cloth so that the surface of the fabric (pattern surface) faces down, and the so-called turn-back surface on the back of the fabric faces up There was a need. For this reason, it is difficult to confirm the exact orientation and position of the cloth placed on the feed base from above, which is the standing position of the operator, and there is a problem that it takes time to position the cloth.

Here, when positioning the cloth placed on the feed base, the pattern or line that is folded back from the front side to the turn-up on the upper surface side while being placed on the feed base (FIG. 21B) It is also possible to position the cloth based on the reference), but the edge of the cloth near the button hole is not necessarily a straight line. If they do not overlap correctly, there is a risk that the button hole and the handle on the front side will be misaligned. For this reason, conventionally, the position of forming the button hole, i.e., the cloth, is determined based on the stitches and the waiting needles that appear on the return side by performing the discarding stitches or hitting the waiting needles in advance along the line on the front side. Was positioning.
JP-A-4-26434

  However, when abandoned sewing is performed on a cloth, it takes time to undo the seam of the abandoned stitch, and when hitting a waiting needle, it takes time to remove the waiting needle and the cloth loosens, so that a cut for a button hole is formed. Is not preferred. In other words, in any case, there is a problem that man-hours increase and it takes time to position the cloth, resulting in a decrease in production efficiency.

  An object of the present invention is to facilitate the positioning work of a sewing product.

  In order to solve the above-mentioned problem, the invention according to claim 1 has a needle vertical movement mechanism that moves the needle up and down, and a mounting table on which the workpiece is placed so as to be orthogonal to the vertical movement path of the needle. A cloth feed mechanism capable of transporting the sewing object placed in the above-described direction in a predetermined direction, a knife receiver and a cloth-cutting knife respectively arranged vertically opposite to each other with the placement table interposed therebetween, and a cutting position by the cloth feed mechanism The cloth which cuts the workpiece when the knife receiver and the cloth cutting knife are matched by driving at least one of the knife receiver and the cloth cutting knife in the vertical direction with respect to the workpiece conveyed to the cloth to form a button hole A cloth cutting mechanism having a cutting drive means, a needle swinging mechanism that swings a needle so as to cross a cloth feeding direction by the cloth feeding mechanism, and a looper mechanism that forms a seam on the sewing product in cooperation with the needle. And control each of the above components to make buttonholes in the sewing product. In a buttonhole sewing machine having a control means for forming a seam around the buttonhole, the workpiece to be sewn provided below the cloth placement surface of the table and placed on the table It is characterized by comprising photographing means for photographing the image from below and display means for displaying an image of the sewing product photographed by the photographing means.

  According to a second aspect of the present invention, in the first aspect of the present invention, the display means displays or attaches a reference mark serving as a reference when placing the sewing product on the mounting table on the surface thereof. It is characterized by becoming.

  According to a third aspect of the present invention, in the second aspect of the present invention, the reference mark is an image showing a position of a button hole formed in the sewing product by the cloth cutting mechanism.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the display means displays or attaches an end position setting mark for setting an end position of the sewing product with respect to the button hole on the surface thereof. It is characterized by becoming.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects of the present invention, the photographing means includes a camera for photographing the sewing product, and light for photographing by the camera. And a light emitting member for irradiating the sewing object.

  A sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, wherein the photographing means and the cloth cutting knife, or a base for holding the photographing means and the female receiver are provided. The image pickup means and the cloth cutting knife, or the drive means that can move the image pickup means and the knife receiver to a position opposite to the knife receiver or the cloth cutting knife via the base.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the photographing means is arranged in the vicinity of a side of the cloth cutting knife or the knife receiver. To do.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to sixth aspects, the photographing means is located below the cloth placement surface of the mounting table, and is the cloth cutting knife or the knife receiver. It is arrange | positioned in the position away from.

  The invention according to claim 9 is the invention according to any one of claims 2 to 8, wherein the cloth edge display control means for displaying a cloth edge mark as the reference mark at a predetermined position in the screen, and the cloth And a cloth edge display position correction input means for correcting the display position of the end mark.

  According to a tenth aspect of the present invention, in the invention according to any one of the second to ninth aspects, an eyelet display control means for displaying an eyelet hole mark as the reference mark at a predetermined position in a screen, and the eyelet It has eyelet hole display position correction input means for correcting the display position of the hole mark.

  According to the first aspect of the present invention, the workpiece to be sewn placed on the placing table is conveyed to the cutting position by the cloth feeding mechanism driven by the control means. Further, a button hole is formed in the sewing material conveyed to the cutting position by the cloth cutting mechanism driven by the control means. Further, by the cloth feeding mechanism and the needle swinging mechanism driven by the control means, an overlaid seam is formed around the button hole of the workpiece to be conveyed in a predetermined direction. Furthermore, according to the first aspect of the present invention, the article to be sewn placed on the placing table can be photographed from below by the photographing means, and the image can be displayed on the display means. That is, when the operator of the buttonhole sewing machine places the sewing product on the mounting table and positions the buttonhole, the operator touches the mounting table on the sewing product while viewing the image displayed on the display means. Can be easily recognized. Therefore, when positioning the workpiece, it is not necessary to check the direction of the pattern by turning the workpiece back, or to place a mark for the buttonhole by throwing away the sewing or waiting needle, and positioning is easy. Can do. Thereby, since the man-hour and work time which are required for positioning of a to-be-sewn material can be reduced, positioning can be facilitated and production efficiency can be improved.

  According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and in particular, the sewing product is positioned using the reference mark displayed or attached on the surface of the display means as an index. By doing so, the positioning operation | work at the time of mounting a to-be-sewn material on a mounting base can be performed still more easily.

  According to the invention described in claim 3, the same effect as that of the invention described in claim 2 can be obtained, and in particular, a button hole formed on the sewing product by a cloth cutting mechanism on the surface of the display means. A reference mark indicating the position is displayed or attached. Accordingly, the operator of the buttonhole sewing machine can easily determine the position of the buttonhole with respect to the pattern or the pattern provided on the surface side in contact with the mounting table among the sewing objects mounted on the mounting table, using the reference mark as an index. Therefore, the sewing product can be easily positioned.

  According to the invention described in claim 4, the same effect as that of the invention described in claim 2 can be obtained. In particular, the position of the end of the sewing product with respect to the button hole is set on the surface of the display means. An end position setting mark is displayed or attached. That is, when placing the sewing product on the mounting table, positioning the sewing product so that the end of the sewing product displayed on the display means matches the end position setting mark. The workpiece can be easily positioned. In addition, for example, among the sewn items placed on the placing table, even if the surface in contact with the placing table is plain, it can be easily positioned.

  According to the fifth aspect of the present invention, the same effect as that of any one of the first to fourth aspects of the present invention can be obtained, and in particular, the photographing means is mounted on the mounting table. The camera has a camera for photographing the sewing product from below, and the surface side of the sewing product in contact with the mounting table is photographed by the camera. Furthermore, since the light emitting member can irradiate the camera with light for photographing the sewing product, the image of the sewing product displayed on the display means can be displayed more clearly. As a result, it is possible to more easily perform the positioning work of the sewing object.

  According to the invention described in claim 6, in addition to obtaining the same effect as the invention described in any one of claims 1 to 5, in particular, the photographing means and the cloth cutting knife or the photographing means The knife receiver can be moved to the opposite position of the knife receiver or the cloth cutting knife through the base by the driving means. Therefore, by moving the base with the driving means, the photographing means can be disposed at a position opposite to the cutting position, so that the vicinity of the cutting position can be clearly photographed. As a result, it is possible to easily and accurately perform the positioning operation of the sewing object.

  According to the seventh aspect of the invention, the same effect as that of any one of the first to sixth aspects can be obtained, and in particular, the photographing means is located on the side of the cloth cutting knife or the female receptacle. By being arranged in the vicinity, the cutting position by the cloth cutting mechanism and the vicinity thereof can be photographed more clearly and easily among the surfaces in contact with the mounting table in the workpiece to be mounted on the mounting table. .

  According to the eighth aspect of the invention, the same effect as that of any one of the first to sixth aspects of the invention can be obtained, and in particular, the photographing means is provided on the cloth placement surface of the placement table. It is arrange | positioned in the position which is lower and is separated from the cloth cutting knife or the knife receiver. Accordingly, for example, the photographing unit can be arranged at a position that does not interfere with other mechanisms such as the cloth cutting mechanism and the cloth feeding mechanism, so that the degree of freedom in arranging the photographing unit is improved. For example, when the direction of the sewing product can be determined by a pattern or a line provided on the sewing product, the image is taken by a photographing means disposed at a position separated from the cloth cutting knife or the knife receiver. Then, by confirming the image displayed on the display means, the direction of the sewing product can be easily determined.

  According to the ninth aspect of the invention, it is possible to obtain the same effect as that of any of the second to eighth aspects of the invention. A cloth edge mark as a reference mark is displayed at a predetermined position, and the cloth edge mark display position on the screen can be corrected by the cloth edge display position correction input means. Thereby, for example, the cloth edge mark can be displayed at a desired position where the operator can easily recognize the positional relationship between the cloth edge and the button hole on the screen of the display means. As a result, it is possible to facilitate the positioning work of the sewing object and improve the production efficiency.

  According to the invention described in claim 10, in addition to obtaining the same effect as the invention described in any one of claims 2 to 9, in particular, the eyelet display control means allows the inside of the screen of the display means to be displayed. The eyelet hole mark as a reference mark is displayed at the predetermined position, and the eyelet hole mark display position in the screen can be corrected by the eyelet hole display position correction input means. As a result, the eyelet mark can be displayed at a desired position on the screen of the display means where the operator can easily recognize the relative positional relationship between the cloth edge and the button hole. As a result, it is possible to facilitate the positioning work of the sewing object and improve the production efficiency.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. However, the first to third embodiments described below have various technically preferable limitations for carrying out the present invention, but the scope of the invention is limited to the following embodiments and illustrated examples. It is not a thing. In the following first to third embodiments, the direction of each part of the sewing machine 1 is determined based on the XYZ axes shown in the drawings. In a state where the sewing machine 1 is installed on a horizontal plane, the Z-axis direction indicates a vertical direction that is a vertical direction, the Y-axis direction indicates a front-rear direction that coincides with the longitudinal direction of the arm portion 5, the X-axis direction is horizontal and the Y-axis direction The left-right direction orthogonal to is shown.

(First embodiment: overall configuration)
FIG. 1 is a schematic view showing an external structure of a buttonhole sewing machine 1 according to a first embodiment to which the present invention is applied. A buttonhole sewing machine 1 (hereinafter simply referred to as a sewing machine 1) is a so-called eyelet hole having a straight portion L and a substantially circular drop-like portion Q as shown in FIG. Or, it is a sewing machine that forms a cut for a button hole such as a sleepy eye hole shown in FIG.

As shown in FIG. 1, the sewing machine 1 includes a sewing machine frame 2 and a feed base 11 as a placement table on which cloth is placed on the bed 3 of the sewing machine frame 2. The cloth feeding mechanism 10 capable of transporting the cloth thus produced in the XY directions (predetermined directions), the knife receiver 27 and the cloth cutting knife 21 (see FIGS. 3 to 7) respectively arranged vertically opposite to each other with the feeding table 11 in between. ), A needle swing mechanism that swings the sewing needle 9 across the cloth feed direction by the cloth feed mechanism 10, and the sewing needle in synchronization with the swing of the sewing needle 9 by the needle swing mechanism. A needle drive mechanism (not shown) that drives the arm 9 up and down, a looper mechanism 60 (see FIGS. 2 to 4) that forms a seam of the overlock stitch in cooperation with the needle drive mechanism and the needle swing mechanism, The cloth provided below the placement surface and placed on the feed base 11 A camera unit 40 (see FIGS. 4 to 7) as a photographing means for photographing from one side, a display unit 50a as a display means for displaying an image of a cloth photographed by the camera unit 40, and an operator for performing various settings. And an operation panel 50 having a control unit 50b, and a control unit 70 as control means for controlling each of the above components to form a button hole in the cloth and forming a seam around the button hole.
Hereinafter, each part will be described in detail.

(Sewing frame)
As shown in FIG. 1, the sewing machine frame 2 includes a bed portion 3 placed on a sewing machine table, a vertical body portion 4 erected upward from the bed portion 3, and the vertical body portion 4. And an arm portion 5 extending forward (Y-axis direction) from the upper portion, and its outer shape is formed in a substantially U shape in front view. A sewing machine main shaft (not shown) that is rotated by a sewing machine motor 8 (see FIG. 11) is provided at a substantially central portion in the longitudinal direction in the arm portion 5 so as to be rotatable along the X-axis direction.

(Needle drive mechanism)
A needle drive mechanism (not shown) includes an upper shaft that is provided so as to be rotatable in parallel with the main spindle of the sewing machine, a connecting member that is rotatably connected to the upper shaft via an eccentric cam, and one end that is the other of the connecting member. A needle bar drive that is pivotally connected to the end and that has the other end extended to the tip in the arm portion 5 and supported so as to be swingable about an axis along the X-axis direction at a substantially central portion in the longitudinal direction. A needle bar which is connected to the other end of the needle bar drive lever via a needle bar hug, is supported so as to be vertically movable and swingable at the distal end in the arm portion 5, and holds the sewing needle 9 at the lower end; It has. When the sewing machine main shaft rotates in accordance with the rotational drive of the sewing machine motor 8, the upper shaft is rotated through the gear, and one end of the needle bar drive lever is swung up and down through the eccentric cam and the connecting member. As a result, the needle bar connected to the other end of the needle bar drive lever and the sewing needle 9 held at the lower end thereof reciprocate substantially along the vertical direction.

(Needle swing mechanism)
A needle swing mechanism (not shown) is disposed in the arm portion 5 of the sewing machine frame 2, and applies a swinging force to the needle bar via the eccentric cam and the link member in accordance with the rotation of the sewing machine main shaft. The needle swinging mechanism is connected to a looper mechanism 60 described later via a turning mechanism 30 shown in FIG.
As shown in FIG. 2, the turning mechanism 30 applies a turning force to the looper mechanism 60 via pulleys 37 and 38 and the belt 32 by driving a turning pulse motor 31 connected to the control unit 70, and A turning force is applied from 32 to the needle swing mechanism via the pulley 35, the shaft 34, the pulleys 36 and 39, and the belt 33. Then, with the needle bar 9a being vertically supported, the needle swinging mechanism and the looper mechanism 60 are simultaneously rotated in the same direction around the axis along the Z-axis direction that is coaxial with the needle bar 9a. It has become.
Further, the needle swinging mechanism swings the sewing needle 9 in a direction crossing the cloth feeding direction with respect to the cloth conveyed by the cloth feeding mechanism 10 to be described later, in addition to the linear portion L, FIG. A radial seam such as the drop-like portion Q of the eyelet buttonhole shown in FIG. 5 or the end of the sleepy buttonhole shown in FIG. 22B is formed, and a buttonhole seam is formed.

(Looper mechanism)
The looper mechanism 60 includes a pair of left and right loopers (not shown) disposed below a needle plate (not shown) and a spreader. The left and right loopers are swung left and right in synchronism with the vertical movement of the sewing needle 9, and the left and right spreaders perform opening and closing movements in synchronism with the rocking movement of the left and right loopers. Then, the looper mechanism 60 is rotated together with the sewing needle 9 and the needle swinging mechanism by the turning mechanism 30 during sewing of the drop-like portion Q of the eyelet hole, etc., and thereby cooperates with the sewing needle 9 that moves up and down and swings. It works to form a radial seam, and the buttonhole is stitched over.

(Cloth feed mechanism)
As shown in FIGS. 3 and 4, the cloth feed mechanism 10 includes a feed base 11 as a placement table on which the workpiece is placed so as to be orthogonal to the vertical movement path of the sewing needle 9, and the feed base 11 on the horizontal plane. X-axis pulse motor 12 and Y-axis pulse motor 13 (see FIG. 11) as feed driving means that move in the X and Y directions, and a presser mechanism 14 that presses the cloth placed on the feed base 11 from above. ing.

The feed table 11 is provided on the side of the needle drop position on the upper surface of the bed portion 3 and is a hollow, box-shaped horizontally movable mounting table. A presser mechanism 14 is mounted on the feed base 11, and the X-axis pulse motor 12 and the Y-axis pulse motor 13 are driven while the cloth placed on the upper surface of the feed base 11 is being pressed by the press mechanism 14. Accordingly, the presser mechanism 14 moves back and forth and left and right (horizontal direction).
Further, the feed base 11 has a substantially U-shape whose bottom is opened toward the vertical body 4 in plan view, and is arranged at the needle drop position of the bed 3 facing the sewing needle 9. It is possible to move in the XY direction while avoiding interference with the looper mechanism 60 and the cloth cutting mechanism 20 adjacent to the looper mechanism 60.
On the upper surface of the feed base 11, the pressing plate 11 a divided into the left and right as viewed from the operator's working position side, that is, the distal end side of the arm portion 5, so as to avoid the needle drop position of the sewing needle 9 and the cloth cutting knife 21. 11a is provided (see FIG. 3). A pair of pressing mechanisms 14 that clamp the cloth in cooperation with the pressing plates 11a and 11a are disposed at the end portions (right ends in FIG. 3) of the pressing plates 11a and 11a on the vertical body portion 4 side. ing. Further, as shown in FIG. 5, a sufficient gap W is provided at both end portions in the X-axis direction of the cloth cutting knife 21 of each presser plate 11 a, 11 a so as not to prevent the knife receiver 27 from matching the cloth cutting knife 21. Is provided.

The X-axis pulse motor 12 and the Y-axis pulse motor 13 are electrically connected to a control unit 70 which will be described later, and a driving belt (not shown) provided in the bed unit 3 based on a control signal from the control unit 70. Then, the feed base 11 is moved and positioned at an arbitrary XY coordinate position along each guide axis in the X direction and the Y direction.
The presser mechanism 14 includes a presser arm 15 having a base end pivotably connected to the upper part of the feed base 11 around an axis along the X-axis direction, and a presser foot 16 connected to the other end of the presser arm 15. And a press drive air cylinder 17 (FIG. 11) for driving the presser foot 16 up and down by swinging the presser arm 15. In the presser mechanism 14, the presser drive air cylinder 17 expands and contracts when the electromagnetic valve 17 a (FIG. 11) opens and closes in response to an output signal from the control unit 70 described later. The presser mechanism 14 presses the cloth from above when the presser foot 16 supported by the tip end (the other end) of the presser arm 15 is lowered, and performs sewing based on a program stored in the control unit 70 described later. Before the start of the sewing and when the sewing operation is completed, the presser foot 16 is raised so as not to prevent the cloth from being taken in and out. The sewing machine 1 according to the present embodiment is provided with a press switch (not shown) for operating the presser mechanism 14.

(Cloth cutting mechanism)
As shown in FIGS. 3 to 7, the cloth cutting mechanism 20 is juxtaposed with the above-described looper mechanism 60 between the U-shaped portions of the feed base 11, and is closer to the vertical body portion 4 than the looper mechanism 60. It is mounted on the upper surface of the bed 3. The cloth cutting mechanism 20 includes a cloth cutting knife 21 having a cutting edge for eyelet holes, a knife base 22 of the present invention that holds the cloth cutting knife 21 and a camera unit 40 (described later), and the knife. A lower knife base 24 that supports the upper base 22 movably along the X-axis direction and a lower end of the arm portion 5 that faces the cloth cutting knife 21 are supported to be movable up and down toward the cloth cutting knife 21. The knife receiver 27 and the cloth conveyed to the cutting position (described later) by the cloth feeding mechanism 10 are driven in the vertical direction so that the cloth cutting knife 21 and the knife receiver 27 are matched. A cloth cutting pulse motor 26 (see FIG. 11) is provided as cloth cutting driving means for cutting the cloth to form button holes.

  The knife base 24 is attached to the upper surface of the bed 3 by a set screw 24a as shown in FIG. A knife base lower key portion 25 is provided on the upper surface of the knife base 24 along the X-axis direction. On the upper side of the knife base 24, a knife base 22 that slides along the knife base key part 25 is provided so as to be horizontally movable along the X-axis direction.

  On the lower surface of the upper knife base 22, there is provided a female foundation upper key groove portion 23 slidably fitted to the lower knife base key portion 25 along the X-axis direction. As shown in FIGS. 5 to 7, the female base key groove portion 23 in the present embodiment has a dovetail shape that fits with the female base lower key portion 25 that has a tail shape of a pigeon. That is, the female base upper 24 is controlled to move in the vertical direction by fitting the female base upper key groove part 23 and the female base lower key part 25, and is not separated from the upper surface of the female base bottom X. It is provided to be slidable along the axial direction. Thereby, the cloth cutting knife 21 and the camera unit 40 mounted on the knife base 22 move only in the X-axis direction without changing the height integrally with the knife base 22.

  The cloth cutting knife 21 is detachably fixed to the knife base 22 by a fixing plate 21a and a set screw 21b shown in FIGS. 5 and 6 and a knife stopper 21c and a set screw 21d shown in FIGS. . As shown in FIGS. 4 to 7, the cloth cutting knife 21 has a cutting edge 21 e along the Y-axis direction facing upward, and the cutting edge 21 e is horizontal at substantially the same height as the placement surface that is the upper surface of the feed base 11. It is arranged to become. Further, as shown in FIG. 3, the cloth cutting knife 21 is positioned between the presser legs 16 and 16 when the pair of left and right presser legs 16 and 16 supported by the presser arms 15 and 15 are lowered. It is arranged like this.

  The female receiver 27 is supported by a link mechanism (not shown) provided in the arm portion 5 so as to be movable up and down. The knife receiver 27 is driven up and down via the link mechanism by driving a cloth cutting pulse motor 26 disposed in the arm portion 5. The knife receiver 27 is lowered at a predetermined timing toward the cloth cutting knife 21 provided on the bed portion 3, and forms an eyelet button hole in the cloth in cooperation with the cloth cutting knife 21.

  The cloth cutting pulse motor 26 is electrically connected to a control unit 70 described later, and performs forward and reverse rotation at a predetermined timing based on a control signal from the control unit 70. As a result, a driving force for moving up and down is applied to the cloth cutting knife 21 via the link mechanism.

(Camera unit)
As shown in FIGS. 4 to 7, the camera unit 40 irradiates a camera module 41 for photographing the lower surface of the cloth placed on the feed base 11 and light for photographing the lower surface of the cloth by the camera module 41. As a driving means that enables the illumination device 46 as an illuminating means, the camera unit 40 and the cloth cutting knife 21 described above to move to a position where the knife receiver 27 descends, that is, a position opposite to the knife receiver 27. An air cylinder 43 for moving the camera.

  As shown in FIGS. 5 to 7, the camera module 41 is disposed in the vicinity of the side of the cloth cutting knife 21, and is attached to the upper surface of the knife base 22 with the photographing lens 41 a facing upward. ing. In other words, the camera module 41 is located laterally in the X-axis direction with respect to the cloth cutting knife 21 arranged along the Y-axis direction, and the cloth cutting position located above the cloth cutting knife 21 is set downward. It is installed side by side in a state that can be taken from. A cable 42 extending from the camera module 41 is connected to a control unit 70 (described later) in a control box (not shown) provided below the sewing machine table (see FIG. 11).

  The illuminating device 46 is disposed in the vicinity of the side of the camera module 41, and a case 47 in which an LED lamp 49 as a light emitting member is disposed on the upper portion is attached to the upper surface of the bed portion 3 with a screw 48 to irradiate the upper portion. It is provided in a possible state. Specifically, the LED lamp 49 irradiates the lower position of the cloth at the cutting position by irradiating the lower position of the knife receiver 27, that is, the cloth positioned above the cloth cutting knife 21 from the lower side. A cable 49a extending from the illumination device 46 is connected to a control unit 70 (described later) in a control box (not shown) provided below the sewing machine table (see FIG. 11).

  The camera moving air cylinder 43 is attached to the lower knife base 24 with a set screw 43a. The cylinder rod 44 of the camera moving air cylinder 43 is provided so as to be able to advance and retreat along the X-axis direction, and its tip is screwed into the knife base 22 and is fixed by a nut 44a. The camera moving air cylinder 43 is connected with two air tubes 43c and 43c for forward movement and backward movement through a joint 43b. Each air tube 43c and 43c is connected to an electromagnetic valve 45. (See FIG. 11). The air cylinder 43 for driving the camera applies an advancing / retreating movement force in the X-axis direction to the upper knife base 22 connected to the cylinder rod 44 in response to opening / closing of an electromagnetic valve 45 based on a control signal from the control unit 70 described later. Give.

  Here, in the camera unit 40 according to the present embodiment, the cloth cutting knife 21 is disposed at a position opposite to the knife receiver 27 in a state where the cylinder rod 44 is disposed at the last retracted position (see FIG. 10), and on the side thereof. The camera module 41 is configured to be retracted. On the other hand, in a state where the cylinder rod 44 is disposed at the most advanced position (see FIG. 9), the lens 41a of the camera module 41 fixed on the knife base 22 is disposed at the position facing the knife receiver 27. It has become. That is, the camera unit 40 is configured to move the cloth cutting knife 21 and the camera module 41 to the opposing position of the knife receiver 27 via the knife base 22 by driving the camera moving air cylinder 43. .

  In this embodiment, a camera moving air cylinder 43 (air cylinder) is used as a driving source (driving means) for moving the camera unit 40. For example, an actuator such as a solenoid or a pulse motor is driven. It may be used as a source. In the present embodiment, the cloth cutting knife 21 and the camera module 41 are moved by a single drive source (camera moving air cylinder 43) via the knife base 22; It is good also as a structure which moves. In this embodiment, the lighting device 46 is fixed to the upper surface of the bed 3 via the case 47. For example, the lighting device 46 is fixed to the female base 22 so as to be juxtaposed with the camera module 41, and the camera is moved. The air cylinder 43 may be driven to move in the X-axis direction together with the cloth cutting knife 21 and the camera module 41.

(control panel)
The operation panel 50 is fixed via a mounting plate 50c on a sewing machine table that is easy to see for an operator working on the sewing machine surface side and does not hinder the work. The operation panel 50 is connected to the control unit 70 in the control box by a cable (not shown). As shown in FIG. 8, the operation panel 50 displays various setting information of the sewing machine 1, and also displays a liquid crystal screen 52 as a display unit that displays an image of the cloth photographed by the camera unit 40, and various settings of the sewing machine 1. And an operation key group 57b for adjusting the display state of the displayed cloth image.
The liquid crystal screen 52 is a substantially rectangular display screen provided at a substantially central portion of the case 51, and an image is displayed so that the vertical direction in the screen corresponds to the Y-axis direction of the sewing machine 1. ing. Specifically, the lower side of the liquid crystal screen 52 indicates the leading end side of the bed portion 3, and the upper side of the liquid crystal screen 52 indicates the vertical trunk portion 4 side of the bed portion 3. That is, the liquid crystal screen 52 displays the arrangement of the cloth viewed from the sewing machine surface side, which is the operator's standing position, in a state where the operator viewing the liquid crystal screen 52 can easily recognize intuitively. On the liquid crystal screen 52, an image on the lower surface side of the cloth photographed by the camera unit 40 is displayed.
The operation key group 57b includes a mode key 53 for switching an image adjustment command, a plus key (+ key) 55 and a minus key (−key) 56 for changing a numerical value in each mode, a changed command, A reset key 54 for resetting the numerical value is provided.

The operation panel 50 according to the present embodiment has a cloth end mark as a reference mark that serves as a reference when the cloth is placed on the feed base 11 by the control unit 70 described later on the screen of the liquid crystal screen 52, that is, on the surface. 58 and eyelet hole mark 59 are displayed.
As shown in FIG. 8, the cloth end mark 58 is displayed as a straight line extending in the horizontal direction (left and right direction in FIG. 8) at the top of the liquid crystal screen 52. The cloth edge mark 58 is an edge position setting mark for setting the edge position of the cloth with respect to the button hole on the surface of the liquid crystal screen 52. The cloth edge mark 58 is the edge of the cloth as viewed from the back side (return side) of the cloth (see FIG. 21 (b)) is used as a reference line to facilitate positioning of the cloth placed on the upper surface of the feed base 11.
As shown in FIG. 8, the eyelet mark 59 is displayed along the vertical direction of the screen almost at the center of the liquid crystal screen 52. This eyelet hole mark 59 is an image showing the position of the eyelet buttonhole formed on the cloth by the cloth cutting mechanism 20, and the drop-like portion Q (FIG. 22A) of the upper eyelet according to the formation position. Is displayed at a predetermined distance from the cloth edge mark 58.

  Further, on the operation panel 50 according to the present embodiment, the cloth edge mark 58 can be displayed with the mode key 53, the plus key 55, and the minus key 56 being arbitrarily changed in position and inclination in the vertical direction and the diagonal direction. ing. That is, the operation key group 57 in this embodiment functions as a cloth edge display position correction input unit for correcting the display position of the cloth edge mark 58. Further, the operation panel 50 displays the eyelet mark 59 by changing the position of the eyelet mark 59 in the horizontal direction and the vertical direction in addition to the mode key 53, the plus key 55, and the minus key 56, and changing the inclination in an arbitrary oblique direction. It can be done. That is, the operation key group 57 in this embodiment functions as an eyelet display position correction input unit for correcting the display position of the eyelet hole mark. The eyelet hole mark 59 may be, for example, a linear mark along the vertical direction in the liquid crystal screen 52 such that one end (the upper end in FIG. 8) indicates the apex of the eyelet hole. It may be a circle (circle) indicating the drop-shaped portion Q, or a cross mark indicating the center of the drop-shaped portion Q.

  The operation panel 50 also includes an operation key group 57a (see FIGS. 1 and 11) that functions as input means for an operator to perform various setting operations on the sewing machine 1 and input operations of various data. On the cursor and pointer displayed on the display unit 52a, the feed base 11, and the display unit 52a, the above table is displayed. Various data set and input via the various keys on the operation panel 50 are output to the control unit 70 described later and stored in the EEPROM 74 described later.

(Control part)
Next, the configuration of the control system of the sewing machine 1 will be described in detail based on FIG.
FIG. 11 is a control block diagram showing an electrical configuration of the sewing machine 1 according to the present invention. As shown in FIG. 11, the control unit 70 includes a CPU 71, a ROM 72, a RAM 73, an EEPROM 74, and an I / O interface 75, and main parts are configured. A ROM 72, a RAM 73, an EEPROM 74, and an I / O interface 75 are connected to the CPU 71 via a bus.

  The CPU 71 stores various control programs for the buttonhole sewing machine 1 stored in the ROM 72 and the EEPROM 74 according to operation signals input from the operation pedal 6, various settings input from the operation panel 50, various data, and the like. The operation processing of each part is centrally controlled in accordance with the various data being stored, and the processing results are stored in the work area in the RAM 73, and various data input by operating the operation panel 50 and the processing results stored in the RAM 73 are required. In response, the data is stored in the EEPROM 74. Then, the CPU 71 controls driving of each part constituting the sewing machine 1.

  The ROM 72 drives a control program (normal sewing program) for the sewing machine 1 to perform normal buttonhole stitching, setting data relating to various types of sewing, and the actuators 8, 12, 13, 17, 26 described above. A basic sewing program for forming a desired seam is stored and stored. Further, the ROM 72 in the present embodiment stores a program for displaying a cloth image, cloth edge mark 58 and eyelet hole mark 59 photographed by the camera unit 40 on the liquid crystal screen 52 of the operation panel 50. .

  The RAM 73 is provided with various work memories and counters, and is used as a work area (work area) during the sewing operation.

The EEPROM 74 stores sewing data relating to a plurality of stitch patterns for operating the sewing needle 9 and the feed base 11 to form various stitch shapes. Each piece of sewing data includes data related to multiple types of commands such as sewing commands, idle feed commands, thread trimming commands, and control amounts required to execute the commands (for example, stitch length, spindle motor rotation speed, stitch length (X direction ) -Spindle rotation speed table, stitch length (Y direction) -spindle rotation speed table, etc.) are recorded in the order of processing. That is, the sewing command sets the cloth feed amount (seam length) by the X-axis pulse motor 12 and the Y-axis pulse motor 13 for each stitch, and the idle feed command sets the X-axis pulse motor 12 and the Y-axis without sewing. The cloth feed amount by the shaft pulse motor 13 is set, and the drive command for the electromagnetic valve 18a of the thread trimming air cylinder 18 is set as the thread trimming command. When the CPU 71 reads the sewing data, the CPU 71 sequentially executes commands to drive the X-axis pulse motor 12 and the Y-axis pulse motor 13 to move the cloth to a predetermined position or to move the cloth to a predetermined position. When the sewing needle 9 is dropped, or the sewing thread is cut after a series of movements, the operation control for executing a series of sewing set in one piece of sewing data is performed.
Further, the EEPROM 74 according to the present embodiment stores data related to the reference mark correction value for displaying the cloth end mark 58 and the eyelet hole mark 59 as reference marks at predetermined positions on the liquid crystal screen 52. For example, the reference mark correction value is obtained by setting the display position of the reference mark 58 or the eyelet hole mark 59 displayed on the liquid crystal screen 52 so as to be superimposed on the photographed image by the camera module 41 (see, for example, FIG. 8). ) To correction values for display by shifting (moving) in the vertical direction or the horizontal direction according to the input operation from the operation key group 57b. The reference mark correction value may be used to display the reference mark 58 or the eyelet hole mark 59 displayed on the liquid crystal screen 52 obliquely, for example, by tilting or rotating from the reference position. Good.

  The sewing machine motor 8 is connected to the I / O interface 75 via a driver 8 a for the sewing machine motor 8. The sewing machine motor 8 can be feedback-controlled by inputting a detection signal to the control unit 70 from an encoder 8b that detects the rotational speed of the sewing machine motor 8. The driver 8a is connected to a sewing needle upper position sensor (not shown) that detects that the sewing needle 9 has been raised. The controller 70 determines the number of sewing needles when a stitch is formed by the sewing needle 9. It is to be counted.

  An X-axis pulse motor 12 and a Y-axis pulse motor 13 are connected to the I / O interface 75 via drivers 12a and 13a, respectively, and an X-axis for detecting the origin positions of both the pulse motors 12 and 13 is connected. An origin sensor 12b and a Y-axis origin sensor 13b are connected. The X-axis pulse motor 12 and the Y-axis pulse motor 13 are driving means for moving the feed base 11 in the XY direction based on the sewing data (seam pattern). The X-axis origin sensor 12b and the Y-axis origin sensor 13b are respectively Sensors for detecting the origin positions of the X-axis pulse motor 12 and the Y-axis pulse motor 13 as drive means, which are arranged in the bed portion 3 respectively.

The turning pulse motor 31 is connected to the I / O interface 75 via a driver 31a, and an origin sensor 31b for detecting the origin position of the turning pulse motor 31 is connected. As a result, the CPU 71 can execute the eyelet buttonhole turning program such as the normal sewing program stored in the ROM 72 to drive the turning pulse motor 31 by a predetermined amount at a predetermined timing.
The cloth cutting pulse motor 26 is connected to the I / O interface 75 via a driver 26a, and an origin sensor 26b for detecting the origin position of the cloth cutting pulse motor 26 is connected. As a result, the CPU 71 can execute the eyelet buttonhole sewing program such as the normal sewing program stored in the ROM 72 to drive the cloth cutting pulse motor 26 by a predetermined amount at a predetermined timing.
Further, the thread trimming air cylinder 18 is connected to the I / O interface 75 via a driver 18b and a solenoid valve 18a. Then, the CPU 71 switches the electromagnetic valve 18a on / off at a predetermined timing via a driver 18b based on a program for eyelet buttonhole sewing such as a normal sewing program stored in the ROM 72, whereby the thread trimming air cylinder 18 Is activated to perform thread trimming.
The I / O interface 75 is connected to a press drive air cylinder 17 via a driver 17b and a solenoid valve 17a. Then, the CPU 71 switches the electromagnetic valve 17a ON / OFF at a predetermined timing via the driver 17b based on a program for eyelet buttonhole drilling such as a normal sewing program stored in the ROM 72, so that the press drive air cylinder 17 operates to perform cloth pressing.
A camera moving air cylinder 43 is connected to the I / O interface 75 via a driver 45 a and a solenoid valve 45. Then, the CPU 71 switches the electromagnetic valve 43 ON / OFF at a predetermined timing via the driver 45a based on a program for eyelet buttonhole drilling such as a normal sewing program stored in the ROM 72, whereby a camera driven air cylinder 43 operates to move the camera unit 40.

  When the control unit 70 detects signals from the operation pedal 6, the operation panel 50, and various sensors (not shown), the CPU 71 performs various operations using the RAM 73 as a work area based on various control programs stored in the ROM 72 and the EEPROM 74. The control signal for driving is output to the various actuators 8, 12, 13, 17, and 26 that perform the sewing operation. Thus, the control unit 70 performs centralized control so that the actuators 8, 12, 13, 17, 26, and 31 are driven at a predetermined timing.

  Further, the control unit 70 in the present embodiment functions as a cloth edge display control unit that displays a cloth edge mark 58 as a reference mark at a predetermined position in the liquid crystal screen 52. Further, the CPU 71 functions as an eyelet display control means for displaying an eyelet mark 59 as a reference mark at a predetermined position in the liquid crystal screen 52.

(First embodiment: description of operation)
Next, the operation of the sewing machine 1 having the above configuration will be described based on the flowchart shown in FIG.
After the main power of the sewing machine 1 is turned on and turned on (step S1), it is detected that a preparation key (not shown) provided on the operation panel 50 is pressed and turned on (step S2). Then, the CPU 71 searches for the origins of pulse motors (for example, the X-axis pulse motor 12, the Y-axis pulse motor 13, the cloth cutting pulse motor 26, etc.) provided in each part of the sewing machine 1 and initializes each origin ( Step S3). At this time, the cloth cutting knife 21 is arranged at the sewing position shown in FIG. Thereafter, the CPU 71 determines whether or not the camera module 41 is set to ON by a setting switch (not shown) provided on the operation panel 50 and is in an effective state (step S4).
If the camera module 41 is valid in step S4 (step S4; Yes), the CPU 71 turns on the electromagnetic valve 45 of the camera moving air cylinder 43 (step S5), and then turns on the illumination device 46 (step S6). In addition, control for displaying a photographed image of the camera module 41 by the operation panel 50 is performed (step S7). At this time, when the electromagnetic valve 45 is turned on, the camera moving air cylinder 43 is driven and the cylinder rod 44 moves in the forward direction (leftward in FIGS. 9 and 10). Along with this, the knife base 22 is moved along the knife base lower key part 25 and the knife base upper key groove part 23 to the most advanced position (see FIG. 9) as the cloth setting position. The camera module 41 is disposed at the cloth cutting position, that is, at the position facing the knife receiver 27 (see FIG. 9). In this state, an image photographed by the camera module 41 is displayed on the liquid crystal screen 52 of the operation panel 50.

Here, when the operator places the cloth on the upper surface of the feed base 11, among the cloths placed on the feed base 11, the lower surface side of the cloth cutting position by the cloth cutting knife 21 and the knife receiver 27, that is, the body. An image (video) on the front side is taken by the camera module 41 from a gap W (see FIG. 6) provided between the presser plates 11a and 11a and displayed on the liquid crystal screen 52 of the operation panel 50. Further, since the cloth end mark 58 and the eyelet hole mark 59 which are the positioning reference when placing the cloth are displayed on the liquid crystal screen 52, the operator positions the cloth on the basis of these marks 58 and 59. Do.
When it is detected that the press switch (not shown) has been pressed by the operator of the sewing machine 1 after the positioning of the cloth is completed, the CPU 71 drives the press drive air cylinder 17 via the driver 17b and the electromagnetic valve 17a. Thus, control for lowering the pressing arm 15 and the pressing foot 16 is performed (step S8). Thereby, a cloth is clamped between the presser foot 16 and the feed base 11, and this cloth is held in a state in which it can move in the horizontal direction. Further, after driving the pressing drive air cylinder 17 in step S8, the CPU 71 performs control to turn off the electromagnetic valve 45 and retract the cylinder rod 44 to the last retracted position (step S9). Along with this, the cloth cutting knife 21 is arranged at the cutting position (see FIG. 10) via the knife base 22 and is in a sewing-ready state.

  Next, the CPU 71 ends the display of the captured image of the camera module 41 on the operation panel 50 (step S10), and performs control to turn off the illumination device 46 (step S11). At this stage, a normal setting screen is displayed on the liquid crystal screen 52. Next, the CPU 71 determines whether or not the press switch has been pressed again (step S12). If it is detected in step S12 that the press switch has been pressed again (step S12; Yes), the CPU 71 proceeds to step S4 and determines again whether the camera module 41 is valid. . That is, when the pressing switch is pressed again in step S12, a procedure for redoing the cloth positioning operation (placement operation / setting operation) in steps S4 to S11 is ensured.

  Here, in step S4 described above, when the press switch is turned ON (step S16; No) in a state where the camera module 41 is not valid (step S4; No), the CPU 71 proceeds to step S12 and again presses the press switch. It is determined whether or not the button has been pressed. That is, when the camera module 41 is not required, for example, when buttonhole sewing is performed on a plain cloth as shown in FIG. 20A, or when it is not necessary to align the buttonhole with a line or grid, The cloth cutting knife 21 and the camera module 41 are exchanged, and the cloth is placed as usual without taking an image on the lower surface side of the cloth. Note that whether or not the camera module 41 is to be enabled can be set to be switchable in advance by an input operation from the operation panel 50.

In step S12, if the press switch is not pressed (step S12; No) and a start switch (not shown) for starting the sewing operation is pressed (step S13), the CPU 71 is stored in the ROM 72 and the EEPROM 74. On the basis of the various programs, the respective parts of the sewing machine 1 are driven to execute control for performing the sewing work (step S14).
At the stage of this sewing operation, the knife receiver 27 is lowered with respect to the cloth cutting knife 21 to form a cut for the button hole, and the needle drop of the sewing needle 9 and the needle swing by the needle drive mechanism and the needle swing mechanism. By performing the operation and the cloth feeding operation by the cloth feeding mechanism 10, the edge of the cut is subjected to edge stitching. It should be noted that either the formation of the cut by lowering the knife receiver 27 or the buttonhole sewing by the sewing needle 9 can be performed first.
Thereafter, the CPU 71 determines again whether or not the preparation key has been pressed (step S15). When the preparation key has been pressed (step S15; Yes), the CPU 71 proceeds to step S3 and determines the origin of each pulse motor. Perform control to initialize. On the other hand, when the preparation key is not pressed in step S15 (step S15; No), the CPU 71 proceeds to step S4 and repeats the above-described operation until the preparation key is pressed next.
As described above, in the buttonhole sewing machine 1 according to the first embodiment, the knife base 22 is mounted on the feed base 11 and driven by the camera moving air cylinder 43 which is an independent drive source different from the feed base 11. The cloth cutting knife 21 and the camera module 43 are mounted on the cloth, and the cloth cutting knife 21 and the camera module 41 are switched to a position opposite to the knife receiver 27 to dispose the cloth body from below (directly below) the cutting position. The front handle is photographed.

(First embodiment: effect)
As described above, according to the sewing machine 1 as the first embodiment, the cloth placed on the feed base 11 can be photographed from below by the camera unit 40, and the image is displayed on the liquid crystal screen 52 of the operation panel 50. Can be displayed. Accordingly, when the operator of the sewing machine 1 places the cloth on the feed base 11 and positions the button hole, the surface of the cloth on the side in contact with the placement base is viewed while viewing the image displayed on the operation panel 50. It can be easily recognized. Accordingly, when positioning the cloth, there is no need to check the direction of the pattern by folding the cloth, or to place a mark for the button hole by throwing away the sewing or waiting needle, and the positioning can be easily performed. For this reason, the man-hours and work time required for positioning the cloth can be reduced, and positioning can be facilitated and production efficiency can be improved. Further, the control unit 70 automatically turns on the camera moving air cylinder 43, the illumination device 46, and the operation panel 50 in conjunction with the preparatory operation before starting sewing, and places the camera module 41 at the cutting position (shooting position). At the same time, the camera moving air cylinder 43, the illuminating device 46 and the operation panel 50 are automatically turned off and the camera module 41 is disposed at the last retracted position in conjunction with the depression of the press switch, thereby liquid crystal on the operation panel 50. The operation of displaying the image of the lower surface of the cloth on the screen 52 can be performed very easily.

Further, since the cloth can be positioned using the reference marks such as the cloth end mark 58 and the eyelet mark 59 displayed on the surface of the liquid crystal screen 52 as an index, the positioning work when placing the cloth on the feed base 11 is possible. Can be performed more easily. In particular, by positioning the cloth so as to coincide with the cloth end mark 58, for example, the surface on the surface side of the cloth placed on the feed base 11 that contacts the upper surface of the feed base 11 is shown in FIG. Even if it is a plain case as shown in (2), the cloth can be easily positioned.
In addition, since the camera module 41 is disposed in the vicinity of the side of the cloth cutting knife 21, the cutting position by the cloth cutting mechanism 20 on the surface of the cloth placed on the feeding table 11 and in contact with the feeding table 11 In addition to being able to photograph the vicinity more clearly and easily, by providing the illumination device 46, the cloth image displayed on the operation panel 50 can be displayed more clearly. As a result, the reliability of the cloth positioning operation can be improved.

  Further, the display position of the cloth edge mark 58 and the eyelet hole mark 59 in the liquid crystal screen 52 can be corrected by the control unit 70 functioning as the cloth edge display position correction input means and the eyelet hole display position correction input means. For example, the cloth edge mark 58 or the eyelet hole mark 59 can be displayed at a desired position on the liquid crystal screen 52 of the operation panel 50 where the operator can easily recognize the positional relationship between the cloth edge and the button hole. As a result, the cloth positioning operation can be facilitated and the production efficiency can be improved.

(Second embodiment)
Next, a second embodiment to which the present invention is applied will be described in detail with reference to FIGS. In the second embodiment and the third embodiment described below, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.
The buttonhole sewing machine 101 (hereinafter referred to as the sewing machine 101) according to the second embodiment is located at a position where the camera unit 140, which is an imaging means, is separated from the cloth cutting position by the cooperation of the cloth cutting knife 21 and the knife receiver 27. This is different from the first embodiment in that it is attached to the upper surface of the bed 3.
Specifically, the camera unit 140 in the present embodiment is arranged in parallel with the looper mechanism 60, and is closer to the front end side of the bed portion 3 than the looper mechanism 60, that is, the operator's work position side in the sewing machine 101 (left side in FIG. 14). Are disposed on the upper surface of the bed portion 3. The camera unit 140 is attached at a position where interference with the feed base 11 can be avoided by the bottom of the feed base 11 opened in a U-shape, and is connected to the control unit 70 by a cable (not shown). 41 and a lighting device 46.
Further, the cloth cutting knife 21 is fixed at a position facing the knife receiver 27 and is fixed to the upper surface of the bed portion 3 via a knife base 122 that supports the cloth cutting knife 21. That is, in this embodiment, the cloth cutting knife 21 and the knife base 122 do not move during sewing, and both are fixed to the upper surface of the bed portion 3.
The ROM 72 provided in the control unit 70 stores a control program for performing a control operation for photographing described later. Then, the CPU 71 controls each part of the sewing machine 1 based on a control program stored in the ROM 72 to display an image of the cloth photographed by the camera module 41 on the operation panel 50. .

Next, the operation of the buttonhole sewing machine 101 according to the second embodiment will be described based on the flowchart shown in FIG.
When the main power supply of the sewing machine 101 is turned on and the power supply is turned on (step S20), and it is detected that the preparation key is pressed and turned on (step S21), the CPU 71 detects the first embodiment. Similarly, the origin search of each pulse motor provided in each part of the sewing machine 101 is performed to initialize each origin (step S22). At this time, the feed base 11 is in the feed origin position shown in FIG. 13, that is, in a state where the feed base 11 is disposed closest to the vertical body 4, and the cloth is cut by the cloth cutting knife 21 and the knife receiver 27. It is arranged at the cutting position where. Thereafter, the CPU 71 determines whether or not the camera module 41 is turned on and is in a valid state (step S23).
In step S23, when the camera module 41 is valid (step S23; Yes), the CPU 71 drives the Y-axis pulse motor 13 to move the feed base 11 closer to the operator than the sewing position (see FIG. 15). ) (Step S24), the lighting device 46 is turned on (step S25), and further, control is performed to display the captured image of the camera module 41 by the operation panel 50 (step S26). As shown in FIG. 15, this feed setting position is a position where the substantially central portion in the longitudinal direction of each presser foot 16 of the presser mechanism 14 is arranged on both upper sides of the camera module 41. In this state, an image photographed by the camera module 41 is displayed on the liquid crystal screen 52 of the operation panel 50.

Here, when the operator places a cloth on the upper surface of the feed base 11, among the cloths placed on the feed base 11, the knife is placed when the feed base 11 is placed at the cloth cutting position (see FIG. 13). The body surface of the cloth disposed at the position facing the receptacle 27 is positioned above the camera module 41, and the image (video) is displayed on the liquid crystal screen 52 of the operation panel 50. Further, since the cloth end mark 58 and the eyelet hole mark 59 which are the positioning reference when placing the cloth are displayed on the liquid crystal screen 52, the operator positions the cloth on the basis of these marks 58 and 59. Do.
When it is detected that the press switch has been pressed by the operator of the sewing machine 101 after the positioning of the cloth is completed, the CPU 71 drives the press drive air cylinder 17 via the driver and the electromagnetic valve 17a to thereby press the press switch. Control to lower the arm 15 and the presser foot 16 is performed (step S27). Thereby, a cloth is clamped between the presser foot 16 and the feed base 11, and this cloth is held in a state in which it can move in the horizontal direction.

  Next, the CPU 71 ends the display of the captured image of the camera module 41 on the operation panel 50 (step S28), and performs control to turn off the illumination device 46 (step S29). At this stage, a normal setting screen is displayed on the liquid crystal screen 52. Next, the CPU 71 determines whether or not the press switch has been pressed again (step S30). If it is detected in step S30 that the press switch has been pressed again (step S30; Yes), the CPU 71 proceeds to step S23 and determines again whether the camera module 41 is valid. . That is, when the pressing switch is pressed again in step S30, a procedure for redoing the cloth positioning operation (placement operation / setting operation) in steps S23 to S29 is secured.

  Here, in step S23 described above, when the press switch is turned on in a state where the camera module 41 is not valid (step S23; No) (step S34), the CPU 71 proceeds to step S30 and the press switch is set again. It is determined whether or not the button has been pressed. That is, as in the case of the first embodiment, when the camera module 41 is not required, the conventional cloth placement operation is performed without taking an image of the lower surface side of the cloth. . Whether or not the camera module 41 is to be enabled can be set to be switchable in advance by an input operation from the operation panel 50.

In step S30, if the press switch is not pressed (step S30; No) and the start switch for starting the sewing operation is pressed (step S31), the CPU 71 is stored in the ROM 72 or the EEPROM 74. Based on the various programs, each part of the sewing machine 101 is driven to execute control for performing the sewing work (step S32).
At the stage of this sewing operation, the knife receiver 27 is lowered with respect to the cloth cutting knife 21 to form a cut for the button hole, and the needle drop of the sewing needle 9 and the needle swing by the needle drive mechanism and the needle swing mechanism. By performing the operation and the cloth feeding operation by the cloth feeding mechanism 10, the edge of the cut is subjected to edge stitching.
Thereafter, the CPU 71 determines again whether or not the preparation key has been pressed (step S33). If the preparation key has been pressed (step S33; Yes), the CPU 71 proceeds to step S22 and determines the origin of each pulse motor. Perform control to initialize. On the other hand, when the preparation key is not pressed in step S33 (step S33; No), the CPU 71 proceeds to step S23 and repeats the above-described operation until the preparation key is pressed next.
As described above, in the buttonhole sewing machine 101 according to the second embodiment, the camera module 41 and the illuminating device 46 are fixed to the upper surface of the bed 3 on the operator working position side of the looper mechanism 60, that is, the needle drop position. The cloth is placed while confirming the pattern on the surface side of the cloth photographed from below (directly below) while the feed base 11 is moved to the work position side. Then, a cut for the button hole is formed with the feed base 11 moved to the cutting position, and sewing is performed at the needle drop position.

  According to the buttonhole sewing machine 101 of the second embodiment having the above-described configuration, the camera module 41 and the illumination device 46 are fixed to the upper surface of the bed 3 and the cloth is positioned at a position separated from the cutting position when positioning the cloth. By adopting a configuration for photographing the lower surface, there is no need to provide another mechanism or drive source for moving the camera module 41 or the illumination device 46, and the cost of the cloth placement work can be reduced with a simple configuration. Simplification can be achieved. Further, by disposing the camera unit 40 at a position separated from the cloth cutting knife 21, for example, the camera unit 40 can be disposed at a position that does not interfere with other mechanisms such as the cloth cutting mechanism 20 and the cloth feeding mechanism 10. Therefore, the degree of freedom is improved when the camera unit 40 is arranged. In addition, since the camera module 41 and the illumination device 46 are attached to the operator side with respect to the looper mechanism 60, the setting position when the cloth is set on the feed base 11 is closer to the operator side, so that the placement work is performed. It becomes easy.

(Third embodiment)
Next, a third embodiment to which the present invention is applied will be described in detail with reference to FIGS.
The buttonhole sewing machine 201 according to the third embodiment is different from the first and second embodiments in that a camera unit 240 as an imaging unit is mounted on the feed base 211. The camera unit 240 is provided with a camera module 41 and an illumination device 46 connected to the control unit 70 via cables (not shown). As shown in FIGS. It is attached inside the feed base 11. In the camera module 41, the lens installed upward is on an extension line of a line along the Y-axis direction that connects the cloth cutting knife 21 and the needle drop position of the sewing needle 9, and is more than the looper mechanism 60. It is arranged on the operator's work position side (left side in FIG. 18). The camera module 41 and the lighting device 46 may be attached at any position on the lower side of the cloth placed on the feed base 11. Further, the feed table 11 has an opening P formed above the camera module 41 in the upper surface portion serving as a placement table, and the camera module 41 photographs the lower surface side of the cloth placed on the feed table 11. Be able to.
The ROM 72 provided in the control unit 70 stores a control program for performing a control operation for photographing described later. Then, the CPU 71 controls each part of the sewing machine 1 based on a control program stored in the ROM 72 to display an image of the cloth photographed by the camera module 41 on the operation panel 50. .
In addition, the camera unit 240 in 3rd embodiment should just be movable with the feed stand 211, for example, may be attached under the presser foot 16. FIG.

Next, the operation of the buttonhole sewing machine 201 according to the third embodiment will be described based on the flowchart shown in FIG.
After the main power supply of the sewing machine 201 is turned on and the power supply is turned on (step S40), when it is detected that the preparation key is pressed and turned on (step S41), the CPU 71 detects each part of the sewing machine 201. The origin of the pulse motor provided in is searched and each origin is initialized (step S42). At this time, the feed base 11 is disposed at the cutting position shown in FIG. Thereafter, the CPU 71 determines whether or not the camera module 41 is turned on and is in a valid state (step S43).
In step S43, when the camera module 41 is valid (step S43; Yes), the CPU 71 controls the display of the captured image of the camera module 41 by the operation panel 50 after turning on the illumination device 46 (step S44). This is performed (step S45). In this state, an image photographed by the camera module 41 is displayed on the liquid crystal screen 52 of the operation panel 50.

Here, when the operator places the cloth on the upper surface of the feed base 11, among the cloths placed on the feed base 11, the cloth cutting knife 21 and the knife receiver 27 cut the cloth along the Y-axis direction. An image (video) on the lower surface side of the position separated from the operator's work position side, that is, the body side is displayed on the liquid crystal screen 52 of the operation panel 50. Further, since the cloth end mark 58 and the eyelet hole mark 59 which are the positioning reference when placing the cloth are displayed on the liquid crystal screen 52, the operator positions the cloth on the basis of these marks 58 and 59. Do.
After the positioning of the cloth is completed, the CPU 71 determines whether or not the press switch has been pressed (step S46). When it is detected in step S46 that the press switch has been pressed (step S46; Yes), the CPU 71 drives the press drive air cylinder 17 via the driver 17b and the electromagnetic valve 17a, thereby holding the press arm. 15 and the presser foot 16 are lowered. Thereby, a cloth is clamped between the presser foot 16 and the feed base 11, and this cloth is held in a state in which it can move in the horizontal direction. Then, the CPU 71 ends the display of the captured image of the camera module 41 on the operation panel 50 (step S47), and performs control to turn off the illumination device 46 (step S48). At this stage, a normal setting screen is displayed on the liquid crystal screen 52.
If it is not detected in step S46 that the press switch has been pressed (step S46; No), the CPU 71 proceeds to step S43 and determines again whether the camera module 41 is valid. That is, the procedure of the cloth positioning operation (placement operation / setting operation) in steps S43 to S46 is ensured until the press switch is pressed in step S46.

Here, in step S43 described above, when the press switch is turned on in a state where the camera module 41 is not valid (step S43; No) (step S52), the CPU 71 proceeds to step S49. When the start switch is pressed (step S49), the CPU 71 executes control for performing the sewing work by driving each part of the sewing machine 1 based on various programs stored in the ROM 72 and the EEPROM 74 (step S49). S50).
Thereafter, the CPU 71 determines again whether or not the preparation key has been pressed (step S51). If the preparation key has been pressed (step S51; Yes), the CPU 71 proceeds to step S42 and determines the origin of each pulse motor. Perform control to initialize. On the other hand, when the preparation key is not pressed in step S51 (step S51; No), the CPU 71 proceeds to step S43 and repeats the above-described operation until the preparation key is pressed next.
As described above, in the buttonhole sewing machine 201 according to the third embodiment, the camera module 41 mounted on the feed base 11 and the lighting device 46 allow the cloth surface to be viewed from below (directly below) the position separated from the cutting position. The pattern is photographed.

  According to the buttonhole sewing machine 201 according to the third embodiment having the above-described configuration, the camera module 41 and the illumination device 46 are directly attached to the feed base 11 so that the configuration can be simplified. In addition, since the camera module 41 and the illumination device 46 are directly attached to the feed base 11, the camera module 41 causes the lower surface of the cloth to be moved even when the normal cloth setting position is set to the operator side. You can shoot the side.

  In this case, as shown in the first to second embodiments, it is desirable to photograph the cloth side at the cloth cutting position by the cloth cutting knife 21 and the knife receiver 27. When the patterns to be taken out are regularly arranged at equal intervals, they may be attached at positions separated from the cloth cutting knife 21 or the knife receiver 27 as in the present embodiment. In this case, the cloth can be oriented even if the front side is photographed at a position away from the button hole formation position.

(Other)
In addition, the cloth cutting knife 21 and the knife receiver 27 may be provided with their respective vertical positions reversed. That is, in this embodiment, the cloth cutting knife 21 is disposed on the lower bed 3 side and the knife receiver 27 is disposed on the upper arm 5 side with the cloth feed base 11 interposed therebetween. The cloth cutting knife 21 may be provided on the arm part 5 side and the knife receiver 27 may be provided on the bed part 3 side to cut the cloth while the cloth cutting knife 21 descends.

  Further, the light emitting member is not limited to the LED lamp 49, and various light sources can be adopted as long as they can recognize the pattern on the front side of the cloth by photographing with the camera module 41. Moreover, the light source (for example, LED lamp 49) mounted as this light-emitting member can mount the desired number required.

  In the present embodiment, an eyelet button hole (see FIG. 19A) is described as an example of the button hole, but for example, a sleepy button hole having only a straight portion and no drop-like portion (FIG. 20B). It can be applied to various button holes.

  In addition, in the first to third embodiments, the cloth edge mark 58 and the eyelet hole mark 59 which are the reference marks of the present invention are configured to be displayed as images on the liquid crystal screen 52 of the operation panel 50. The cloth end mark 58 and the eyelet hole mark 59 may be affixed or directly described at predetermined positions on the surface of the screen 52 to be used as a reference for placing the cloth on the feed base 11. In this case, the cloth cutting position by the cloth cutting knife 21 and the knife receiver 27, the position of the image photographed by the camera unit 40 and displayed on the liquid crystal screen 52, and the positional relationship between the reference marks attached to the liquid crystal screen 52 are as follows. By making it correspond, it is possible to function as a reference mark for efficiently placing the cloth on the upper surface of the feed base 11 with a simple configuration.

  In the first to third embodiments, the image captured by the camera unit 40 is displayed on the operation panel 50. For example, a display panel is provided separately from the operation panel 50, and the camera unit 40 captures the image. The cloth image and the reference mark may be displayed, and a function similar to that of the operation key group 57b of the operation panel 50 may be provided.

It is a schematic perspective view which shows the external appearance structure of the buttonhole sewing machine which is 1st embodiment. It is a schematic perspective view which shows the turning mechanism in 1st embodiment. It is a top view which shows the feed mechanism in 1st embodiment. It is a schematic side view which shows the feed mechanism in 1st embodiment. It is a schematic plan view which shows the principal part structure of 1st embodiment. It is the figure seen from the A direction arrow in FIG. 5, and is a schematic front view which shows the principal part structure in 1st embodiment. It is the figure seen from the B direction arrow in FIG. 5, and is a schematic side view which shows the principal part structure in 1st embodiment. It is the schematic which shows the structure of the display panel in 1st embodiment. It is operation | movement explanatory drawing which shows operation | movement (imaging position) of the sewing machine in 1st embodiment. It is operation | movement explanatory drawing which shows operation | movement (cutting position) of the sewing machine in 1st embodiment. It is a block diagram which shows the structure of the control part in 1st embodiment. It is a flowchart which shows operation | movement of the buttonhole sewing machine which is 1st embodiment. It is a top view which shows the principal part structure of the buttonhole sewing machine which is 2nd embodiment. It is a schematic side view which shows the schematic structure seen from the C direction arrow in FIG. It is operation | movement explanatory drawing which shows operation | movement (imaging position) of the sewing machine in 2nd embodiment. It is a flowchart which shows operation | movement of the buttonhole sewing machine which is 2nd embodiment. It is a top view which shows the principal part structure of the buttonhole sewing machine which is 3rd embodiment. It is a schematic side view which shows the schematic structure seen from the D direction arrow in FIG. It is a flowchart which shows operation | movement of the buttonhole sewing machine which is 3rd embodiment. It is a schematic diagram which shows the various patterns which appear on the surface (body surface) of to-be-sewn material. (A) is a solid color, (b) is a stripe, and (c) is a lattice pattern. It is a schematic diagram which shows the relationship between the formation position and button pattern of the button hole formed in to-be-sewn material. (A) indicates the front surface (body surface), and (b) indicates the back surface (return). (A) is the schematic which shows an eyelet buttonhole, (b) is the schematic which shows a sleepy eye buttonhole.

Explanation of symbols

1 Sewing machine (button hole sewing machine)
2 Sewing machine frame 3 Bed 4 Vertical trunk 5 Arm 6 Operation pedal 7 Operation panel 8 Sewing motor 9 Sewing needle (needle)
9a Needle bar 10 Cloth feed mechanism 11 Feed table (mounting table)
12 X-axis pulse motor (feed drive means)
13 Y-axis pulse motor (feed drive means)
14 Feeding press mechanism 15 Pressing arm 16 Pressing foot 17 Pressing drive air cylinder 18 Thread trimming air cylinder 20 Cloth cutting mechanism 21 Cloth cutting knife 21a Fixing plate 21b, 21d Set screw 21c Female stopper 21e Cutting edge 22 On knife base (base)
23 Female base upper key groove part 24 Female base lower part 24a Set screw 25 Female base lower key part 26 Cloth cutting pulse motor (cloth cutting drive means)
27 Female receiver 30 Rotating mechanism 40 Camera unit (photographing means)
41 Camera module (camera)
42 Cable 43 Air cylinder 43a for camera movement Set screw 43b Joint 43c Air tube 44 Cylinder rod 44 Nut 45 Solenoid valve 46 Illuminating device (illuminating means)
47 Case 48 Screw 49 LED lamp (light emitting member)
49a Cable 50 Operation panel (display means)
50c Mounting plate 51 Case 52 LCD screen (display unit)
53 mode key 54 reset key 55 + key 56 −key 57 operation key group (cloth edge display position correction means, eyelet hole display position correction means)
58 Cloth edge mark (reference mark, edge position setting mark)
59 Eyelet hole mark (reference mark)
60 looper mechanism 70 control unit (control means, cloth edge display control means, eyelet display control means)
71 CPU
72 ROM
73 RAM
74 EEPROM

Claims (10)

A needle up-and-down movement mechanism that moves the needle up and down;
A cloth feed mechanism that has a placing table for placing the sewing product so as to be orthogonal to the vertical movement path of the needle, and capable of transporting the sewing material placed in the above-described direction in a predetermined direction;
At least one of the knife receiver and the cloth cutting knife is attached to the knife receiver and the cloth cutting knife that are respectively opposed to the upper and lower sides across the mounting table, and the sewing material conveyed to the cutting position by the cloth feeding mechanism. A cloth cutting mechanism having cloth cutting driving means for cutting the workpiece and forming a button hole when the knife receiver and the cloth cutting knife are matched by driving in the vertical direction;
A needle swinging mechanism that swings a needle across the cloth feeding direction by the cloth feeding mechanism;
A looper mechanism that cooperates with the needle to form a seam in the sewing product;
In a buttonhole sewing machine comprising a control means for controlling each of the above components to form a buttonhole in the sewing product and forming a seam around the buttonhole,
An imaging means which is provided below the cloth placement surface of the mounting table and shoots a sewing object to be mounted on the mounting table from below,
A buttonhole sewing machine comprising: display means for displaying an image of a sewing object photographed by the photographing means.   2. The buttonhole head according to claim 1, wherein the display means is configured to display or attach a reference mark serving as a reference when placing the sewing product on the mounting table on the surface thereof. sewing machine.   The buttonhole sewing machine according to claim 2, wherein the reference mark is an image showing a position of a buttonhole formed in the sewing product by the cloth cutting mechanism.   3. The button hole according to claim 2, wherein the display means displays or attaches an end position setting mark for setting an end position of the sewing product with respect to the button hole on the surface thereof. Overlock sewing machine.   The said imaging | photography means has a camera which image | photographs the said to-be-sewn thing, and the light emission member which irradiates the said to-be-sewn object with the light for imaging | photography with the said camera, Any one of Claim 1 to 4 characterized by the above-mentioned. A buttonhole sewing machine according to claim 1.   The imaging means and the cloth cutting knife, or a base for holding the imaging means and the knife receiver, and the imaging means and the cloth cutting knife, or the imaging means and the knife receiver through the foundation. 6. The buttonhole sewing machine according to any one of claims 1 to 5, further comprising driving means that can move to each other at positions opposed to the cloth cutting knife.   The buttonhole sewing machine according to any one of claims 1 to 6, wherein the photographing means is arranged in the vicinity of a side of the cloth cutting knife or knife receiver.   The said imaging | photography means is arrange | positioned in the position below the cloth mounting surface of the said mounting stand and spaced apart from the said cloth cutting knife or a knife receiver. Buttonhole sewing machine as described in the item. Cloth edge display control means for displaying a cloth edge mark as the reference mark at a predetermined position in the screen;
9. The buttonhole sewing machine according to claim 2, further comprising cloth edge display position correction input means for correcting the display position of the cloth edge mark.   It has eyelet hole display control means for displaying a eyelet hole mark as the reference mark at a predetermined position in the screen, and eyelet hole display position correction input means for correcting the display position of the eyelet hole mark. The buttonhole sewing machine according to any one of claims 2 to 9.

Images