KR20090076821A - Buttonhole sewing machine - Google Patents

Abstract

A sewing machine for making a buttonhole is provided to sew core yarn properly without degradation of sewing quality by forming a plurality of needle vibration stitch precisely to a transfer direction of cloth. A sewing machine for making a buttonhole includes the followings: a vertical moving unit(20) moving a needle stand up and down; a needle vibration unit(30) shaking the needle stand; a looper unit(40) forming a stitch on processing cloth with the needle stand; a moving unit moving the processing cloth according to a horizontal plane; a core yarn guide unit guiding an end part of core yarn between needle vibration stitches; a memory unit memorizing sewing data to form the stitch of a buttonhole stitch; and a control unit performing the stitch of the buttonhole stitch around a buttonhole based on the sewing data.

Description

Buttonhole Sewing Machine {BUTTONHOLE SEWING MACHINE}

The present invention relates to a buttonhole sewing machine for buttonhole stitching using a screening.

Background Art Conventionally, a buttonhole sewing machine for forming needle stitches of eyelet buttonhole stitches has a configuration described in Patent Document 1, for example. That is, the buttonhole sewing machine includes a needle bar having a sewing needle, a needle vibration mechanism for shaking the needle bar from side to side, a looper mechanism disposed to face the lower side of the needle bar, a shandong mechanism for moving the needle bar up and down, and a cloth. Drives the cloth feed mechanism for holding the needle and transports it in the front, rear, left and right directions, the swing mechanism for turning the needle bar and the looper, the cloth cutter tool for forming the button hole in the cloth, the needle vibration mechanism, the looper mechanism, and the shank motion mechanism. It is equipped with a sewing machine motor.

In addition, the cloth feed mechanism has an X-axis pulse motor moving left and right and a Y-axis pulse motor moving back and forth, and the swing mechanism has a swing pulse motor.

In order to control the cloth feed mechanism and the swing mechanism, various shapes of sewing are possible by setting the hole shape, the length of the buttonhole stitch, the number of needles, and the like as the pattern data to the sewing shape. At the time of sewing, the cloth feed mechanism and the swing mechanism are controlled by the needle stitch data for each needle calculated from the setting contents of the pattern data.

In addition, a plurality of said pattern data is memorize | stored, and when pattern data is set beforehand, a buttonhole stitch of a different shape can be performed only by selecting a pattern number.

In addition, as described in Patent Literature 2, in the case of buttonhole stitching, there is a case in which a screening is supplied between two needles of needle vibration, and the sewing is made by sewing the screening. Such sewing is provided by supplying means for supplying the screening between the needle dropping positions on both sides of the needle vibration, and sewing the needle in zigzag while dropping the needles on both sides of the screening, so that the stitches of the upper thread are inclined left and right. Sew so that the screen is sandwiched between the fabric and the fabric.

However, there has been a problem that the screening is pulled out from the sewing start end and the sewing is not properly performed depending on the width of the thread, the looper thread, the string to be the core, and the overlock stitch width. In particular, such a problem was remarkable when the screening and the upper thread were slippery materials, or when the width of the overlock stitch and the sewing pitch were wider than the thickness of the screening.

For this reason, as described in patent document 3, it was considered to form a knot in screening at the start of sewing, and to prevent a fall out.

[Patent Document 1] Japanese Patent Laid-Open No. 2000-316171

[Patent Document 2] Japanese Patent Laid-Open No. 2005-304620

[Patent Document 3] Japanese Patent Application Laid-Open No. H10-15267

However, in the case of forming a knot as described in Patent Document 3, since the device for forming the knot should be installed near the sewing portion of the sewing machine, it is hindered to work such as sewing preparation by the worker, Knots remained in the stitches of the buttonhole stitches, and the traces of the stitches became unsatisfactory, resulting in a decrease in sewing quality.

An object of this invention is to insert a screen | seat suitably and to sew, without reducing sewing quality.

The invention as set forth in claim 1 further comprises a needle bar for holding a sewing needle having a hole for inserting the upper thread, a shangdong mechanism for moving the needle bar, and a direction intersecting the length of the button hole formed in the fabric. A needle oscillation mechanism for oscillating the needle bar, a looper mechanism for forming needle stitches in the fabric by cooperation with the needle bar, a moving mechanism for moving the fabric in a direction orthogonal to the vertical direction of the sewing needle, A guide hole means for guiding an end portion of the screening supplied from a supply source between the needle vibration needle stitches formed according to the needle vibration of the needle vibration mechanism, and a buttonhole stitch having at least left and right side sewing portions around the buttonhole. Storage means for storing sewing data for forming needle stitches, and the respective pieces of information are based on the sewing data. A buttonhole sewing machine comprising control means for forming a needle stitch of a buttonhole stitch around the buttonhole, wherein the control means is provided at the sewing start end of the needle stitch of the buttonhole stitch. A control is performed to form a screening needle for stitching by narrowing at least one of a needle vibration width or a sewing pitch of the needle bar in the needle bar.

The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and at least one of the needle vibration width of the needle bar or the sewing pitch is smaller than the needle stitch of the buttonhole stitch to perform the sewing needle stitch. And means for setting sewing data of the button hole stitch, wherein the control means controls to additionally form the examination holding needle stitches based on sewing data of the examination holding needle stitches at the sewing start end of the button hole stitch. do.

The invention according to claim 3 has the same configuration as the invention according to claim 2, and the sewing data of the examination holding needle stitches has position information indicating each needle dropping position of the examination holding needle stitches in a predetermined section. do.

The invention as set forth in claim 4 has the same configuration as the invention as set forth in claim 1, and is provided with positioning means for setting position information indicating respective needle drop positions of the examination holding needle stitches.

The invention as set forth in claim 5 has the same configuration as the invention as set forth in claim 1 and is provided with section setting means for setting the number of needles or the length of the examination holding needle stitches.

The invention according to claim 6 has the same configuration as that of the invention according to claim 1, and the control means checks the sewing data for the position data indicating each needle drop position of the examination holding needle stitch. It is characterized in that the sewing is carried out by automatically converting to sewing having a retaining needle sweat.

In the invention according to claim 1, a buttonhole stitch is performed around the buttonhole at a needle vibration width and a sewing pitch determined according to the sewing data. At the start of sewing, the control means sews at least one of the needle vibration width of the needle bar or the sewing pitch smaller than the side sewing portion. Accordingly, a narrower width of the needle vibration needle stitch or a plurality of needle vibration needle stitches formed more densely with respect to the cloth conveying direction can be formed at the sewing start end, and the sewing start end of the examination is more firmly maintained so as not to be easily pulled out. can do. For this reason, even if the screening and the upper thread are slippery materials or the overlock stitch width and sewing pitch of the normal sewing section are wider than the thickness of the screening, the screening can be reduced more effectively, and the appropriate buttonhole You can stitch.

The invention according to claim 3 realizes sewing that is narrower than the other sewing section for at least one of the needle vibration width of the needle bar or the sewing pitch along the buttonhole by including position information indicating each needle drop position of the examination holding needle stitch in the sewing data. do. For this reason, it is possible to prevent the dropping of the screening by software processing such as setting or correcting sewing data, and it is possible to reduce the dropping of the screening without requiring a design change or a new configuration for each mechanism of the sewing machine. Appropriate buttonhole stitches can be easily realized.

The invention according to claim 4 includes position setting means for setting position information indicating each needle drop position of the examination holding needle stitches, so that the width and sewing pitch of the overlock stitch of the examination holding needle stitches can be arbitrarily set. Therefore, it is possible to set an appropriate screening needle stitch for various types of screening or for various types of buttonhole stitch patterns.

The invention according to claim 5 is provided with section setting means for setting the number of needles or the section length of the examination holding needle stitch section, so that the number of stitches of the examination holding stitch stitch section can be arbitrarily determined, and as a result, the holding force of the examination end section can be arbitrarily selected. This makes it possible to set an appropriate screening needle stitch section for various types of screening or for various types of buttonhole stitch patterns.

For reference, the term "section length" refers to the length of the examination holding needle stitch section in the direction in which sewing progresses perpendicular to the needle vibration direction.

In the invention according to claim 6, since the control means automatically executes a control for sewing to the sewing data for which the examination holding needle stitches are not set, and performs sewing, the setting operation for the examination holding needle stitches is performed. This becomes unnecessary and the data for sewing the examination holding needle stitches becomes unnecessary.

For reference, the automatic conversion means, for example, the control means is a needle vibration width reduced or reduced by a predetermined ratio with respect to the needle vibration width or sewing pitch of a normal sewing section with respect to a predetermined number of needles at the start of sewing. And control to sew a pitch.

(Overall Configuration of Embodiments)

A buttonhole sewing machine 10 according to an embodiment of the present invention will be described based on FIGS. 1 to 10.

As shown in Fig. 1, the buttonhole sewing machine 10 is located at the bottom of the sewing machine as a whole, and has a bed portion 2a that is substantially rectangular in the form of a box, and is vertically provided at one end of the bed portion 2a. A sewing machine frame (2) having a body portion (2b) and an arm portion (2c) extending from the longitudinal body portion (2b) in the same direction as the bed portion (2a) is provided. For reference, in the following description, the direction in which the vertical body portion 2b is placed upright is set as the Z-axis direction, and the direction perpendicular to the Z-axis direction while being the longitudinal direction of the bed portion 2a and the arm portion 2c is Y-axis. Direction, and the direction orthogonal to both a Y-axis direction and a Z-axis direction is made into the X-axis direction.

The button-hole sewing machine 10 is a needle bar 12 for holding the sewing needle 11 through which the upper thread passes, a shanghai copper mechanism 20 for moving the needle bar 12, and a button formed on the fabric The needle vibration mechanism 30 which swings the needle bar 12 in the direction crossing the longitudinal direction of the hole, the looper mechanism 40 which forms the needle stitches of the overlock stitch on the fabric by cooperation with the needle bar 12, and the needle bar. (12) and the swing mechanism 60 which pivots the looper base 47 of the looper mechanism 40, and the cloth lifter 71 puts up and holds the processing cloth, and performs movement in the X and Y axis directions. Guides between the mechanism 70, a cloth cutter tool (not shown) for forming a buttonhole in the fabric, and a needle drop position divided by both sides by vibration of the sewing needle (11) from a test supplier (not shown). Examination guide means (90) and each thread after sewing An operation control means (100 (see Fig. 4)) as a control means for controlling the respective mechanisms based on pattern cutting as sewing data and cutting needle stitches of buttonhole stitches around the buttonholes based on pattern data as sewing data; Equipped.

(Needle)

As shown in FIG. 1, the needle bar 12 is supported by a metal 14 held by a thin disk-shaped leaf spring 13 provided at the upper end of the arm portion 2c. The leaf spring 13 has a disk shape and an outer circumference thereof is held by the arm portion 2c. The metal 14 is arrange | positioned at the center position of the leaf spring 13. The metal 14 is cylindrical in shape, and is held by the leaf spring 13 in a state in which a center line thereof faces in the Z-axis direction in the state where no external force is applied.

The needle bar 12 has a round rod shape and is inserted into the metal 14. The needle bar 12 is slidable along the longitudinal direction by the metal 14 and is rotatably supported about an axis along the longitudinal direction. In addition, since the metal 14 is maintained at the center of the leaf spring 13 as described above, the needle bar 12 inserted into the metal 14 is in a range that is allowed for the bending of the leaf spring 13. With respect to the position of the metal 14, the lower end portion thereof can be inclined in any direction perpendicular to the Z-axis direction.

In addition, the needle bar 12 is capable of guiding the upper thread by hollowing the interior from the upper end to the lower end near the lower end while maintaining the sewing needle 11 at the lower end thereof. A hole is formed in the sewing needle 11 so that the end of the upper thread guided through the inside of the needle bar 12 is inserted.

(Up and down moving mechanism)

As shown in FIG. 1, the shank moving mechanism 20 includes an upper shaft 21 which is driven by a timing belt (not shown) by a sewing machine motor 3, which is a servomotor, and a large and small gear train 22, 23. Rod 26 and rod 26 whose one end is connected to needle bar drive shaft 24 through eccentric cam 25, needle bar drive shaft 24 through which axial rotation is transmitted by upper shaft 21; Shanghai-dong arm 27, one end of which is connected to the other end of the (), the branch member 28 provided on the other end of the Shanghai-dong arm 27, the ring (29) connecting the branch member 28 and the needle bar 12 ).

Both the upper shaft 21 and the needle bar drive shaft 24 are installed along the X-axis direction, and are rotatably supported inside the sewing machine frame 2. Then, the rotational force is transmitted to the needle bar drive shaft 24 by the gear trains 22 and 23 at twice the rotational speed from the upper shaft 21.

The shandong copper arm 27 is axially supported in the sewing machine frame 2 by the support shaft along the X-axis direction at the longitudinal intermediate position. Then, the rod 26 and the eccentric cam 25 convert the rotational movement of the needle bar drive shaft 24 into a reciprocating motion, which is transmitted to one end of the shanghai east arm 27, and both ends thereof are substantially along the Z axis direction. Making it possible to swing.

The other end of the shandong copper arm 27 is connected to the needle bar 12 by a branch member 28 and a ring 29.

The branch member 28 has a forward and backward movement along the extending installation direction (approximately Y-axis direction) of the other end of the shandong east arm 27 with respect to the shandong east arm 27 and the other end of the shandong east arm 27. It is supported so that rotation based on the extension installation direction is possible.

The ring 29 extends linearly along the direction orthogonal to the extending installation direction (approximately Y-axis direction) of the other end of the shanghai-dong arm 27 with respect to the branch member 28, and the other end of the arm 27 extends. It is supported so that rotation based on the direction orthogonal to an installation direction is possible.

The ring 29 is connected to the needle bar 12 in a state in which the needle bar 12 is inserted and inserted into two collars 29a fixed to the needle bar 12. It is possible to rotate around the axis of the needle bar 12.

By such a configuration, even if the needle bar 12 is inclined in any direction allowed by the metal 14, or even when the needle bar 12 is rotated about its longitudinal direction, the shank east arm It is possible to apply a reciprocating vertical movement force from (27).

(Needle vibration mechanism)

As shown in FIG. 1, the needle vibration mechanism 30 includes an outer circumferential cam 31 provided on the upper shaft 21, a rod 32 that swings in contact with the outer circumference of the outer circumferential cam 31, and a rod 32. A link 33 connected to a swing end of the swing end to receive a reciprocating motion, an L-shaped arm 34 connected to the link 33, and an L-type arm 34 rotated. The link 35 which is given the up and down reciprocating motion, the slider 36 which receives the up and down reciprocating motion from the link 35, and the slide guide shaft which makes the slider 36 reciprocable only along the Z-axis direction ( 37) and a swing table 38 that moves in the X-axis direction along the height.

The outer cam 31 provides the rod 32 with a reciprocating rocking motion of one stroke along the Y-axis direction with respect to one rotation of the upper shaft 21.

The rod 32 transmits the reciprocating motion along the Y-axis direction to the L-type arm 34 through the link 33, and the L-type arm 34 converts the reciprocating motion direction to the Z-axis direction and links 35 Pass to the slider 36.

The slider 36 supports the swing table 38 so as to be rotatable about the Z axis, and the swing table 38 is also moved in accordance with the shank movement of the slider 36.

The swinging belt 38 supports the needle bar 12 in a movable state in the vicinity of the lower end of the needle bar 12, and guide grooves inclined between the Z-axis direction and the X-axis direction on both outer sides thereof. Is formed. Then, the swing table 38 is fitted by a concave body (not shown) which is fitted into the guide groove from both sides thereof. When the swing table 38 moves in the vertical direction, the swing table 38 moves obliquely along the guide groove. 38) also vibrates the needle by generating a displacement in the X-axis direction.

As described above, since the needle bar drive shaft 24 rotates at twice the speed of the upper shaft 21, the needle bar 12 makes two shank movements when the swing table 38 reciprocates once in the X-axis direction. That is, the needle bar 12 executes needle drop even when the needle vibrates in any direction by the cooperation of the shank moving mechanism 20 and the needle vibrating mechanism 30.

In addition, since the convex-shaped body which is not shown in figure is supported by the revolving stand 61 of the turning mechanism 60 mentioned later, the needle oscillation direction also turns at the same time at the time of turning of the needle stand 12. As shown in FIG.

(Looper mechanism)

1 and 2, the looper mechanism 40 includes a lower shaft 41 that is rotationally driven by the sewing machine motor 3, a groove cam 42 provided on the lower shaft 41, and a groove. On the spreader swinging arm 43 and the looper swinging arm 44 which swing and engage with the cam 42, the spreader drive shaft 45 swinging and swinging by the spreader swinging arm 43, and the looper swinging arm 44; By a looper drive shaft 46 serving as a drive shaft, a looper base 47 that is rotatably supported by the sewing machine frame 2 with these drive shafts 45 and 46 disposed at a central position, and a looper base 47. The needle plate 48 attached to the upper end of the head), the left looper 49 and the left spreader (not shown) which entangle the lower thread on the upper thread, and make a double round bar, and the single yarn round bar by the upper thread The right looper 50 and the right spreader (not shown) to perform, and each looper 49 and 50 and each spreader in the perpendicular | vertical downward direction of the needle plate 48 Underground it is provided with a mounting board (53).

The groove cam 42 has cam grooves formed on both surfaces thereof, and each of the groove cams 42 is engaged with the spreader swing arm 43 and the looper swing arm 44 to swing at predetermined timings.

Spreader rocking arm 43 is axially supported by a support shaft in the longitudinal intermediate position in the X-axis direction, one end of which is engaged with the groove cam 42, and the other end of which is caught by the lower end of the spreader drive shaft 45. Are combined. That is, the spreader swing arm 43 swings at a predetermined timing determined by the cam groove shape of the groove cam 42 to cause the spreader drive shaft 45 to swing.

The looper swinging arm 44 is axially supported by a support shaft in the longitudinal intermediate position in the X-axis direction, one end of which is engaged with the groove cam 42, and the other end of which is caught by the lower end of the looper drive shaft 46. Are combined. That is, the looper swing arm 44 swings at a predetermined timing determined by the cam groove shape of the groove cam 42 to cause the looper drive shaft 46 to swing.

The looper drive shaft 46 is cylindrical in shape, and the spreader drive shaft 45 can be inserted therein. In addition, the looper drive shaft 46 is connected to the mounting table 53 via a link at the upper end thereof, and swings the mounting table 53 by moving it to each looper 49 and 50 and each spreader. The needle stitch forming operation by the.

The spreader drive shaft 45 is cylindrical and penetrated from the lower end to the upper end, and has a function of guiding the lower thread from the lower end to the upper end. Moreover, the spreader drive shaft 45 is connected to the cam which is not shown in the upper end part through the link, and it is made to swing | move each spreader through a cam, and to make the operation | movement widen by a cam.

The looper base 47 is rotatably supported by the sewing machine frame 2. The looper base 47 is formed in a cylindrical shape, and a spreader drive shaft 45 and a looper drive shaft 46 are inserted in the center thereof.

The upper end of the spreader drive shaft 46 extends to the lower vicinity of the mounting table 53, and the lower thread passed into the spreader drive shaft 45 passes through the thread of the left looper 49 through an unillustrated roadway. Guided to holes (not shown).

The left looper 49 and the left spreader are double rounded at the needle drop of the left needle vibration of the needle bar 12, and the right looper 50 and the right spreader are the needle drop of the right needle vibration of the needle bar 12. Give a single round bar.

Accordingly, the left looper 49 and the left spreader move in the sewing operation direction in accordance with the needle drop timing of the left needle vibration, and the right looper 50 and the right spreader move in the sewing operation direction in accordance with the needle drop timing of the right needle vibration. Operation is given from the looper drive shaft 46 as far as possible. In addition, each spreader is provided with an operation from the spreader drive shaft 45 so that each spreader moves along with each looper 49 and 50 while each spreader extends the sealer with respect to each looper 49 and 50 at a predetermined timing. .

In FIG. 3, the needle plate 48 is located at the upper end of the looper base 47 and rotates integrally with the looper base 47. 3, the needle hole 48a is formed in the center part of the needle plate 48. As shown in FIG. The sewing needle 11 is inserted into the needle hole 48a so that the loop of the upper thread is supplied to the lower side of the needle plate 48, and is intertwined with the lower thread by the predetermined rocking motion of the loopers 49 and 50 and the spreader. Sewing is done. The needle hole 48a is formed in an elongated hole shape along the swinging motion direction of the needle bar 12. In addition, since sewing is made through the needle hole 48a, the lower thread is sewn into the fabric by passing through the needle hole 48a.

At this time, the screening is also guided through the screening hole 48b formed through the needle plate 48 from the side of the needle plate 48 between the two needle dropping points divided by both sides by the needle vibration, and processed by the upper thread. The sewing is attached to. That is, the needle plate 48 also functions as a part of the examination guide means 90 for guiding the end of the examination supplied from the examination supply source between the needle vibration needle stitches formed by the needle vibration of the needle vibration mechanism 30.

(Turning mechanism)

When the buttonhole sewing machine 10 performs an overlock stitch on a buttonhole having a shape of a straight line portion and a droplet shape, such as an eyelet button hole, the needle vibration vibrates the needle while vibrating the needle along the hole edge of the droplet part. It is necessary to sew the direction by sewing. Therefore, a swing mechanism 60 is provided which pivots the needle vibration direction and pivots the arrangement of the loopers 49 and 50 and the spreader.

The pivot mechanism 60 pivots the needle bar pulley 61 for pivoting the swing table 38 of the needle vibration mechanism 30 around the needle bar 12 and the looper base 47 of the looper mechanism 40. The looper pulley 62 and the turning motor 63 (refer FIG. 4) which is a pulse motor which rotates these pulleys 61 and 62 through a timing belt not shown are provided.

As described above, the swing table 38 is fitted by convex bodies from both sides with respect to the guide grooves formed on both sides thereof, and each convex member is supported by the needle bar pulley 61. Therefore, by swinging the needle bar pulley 61, the swing table 38 is also rotated through each convex body, and as a result, the needle vibration direction can be turned.

In addition, since the needle bar pulley 61 has loosely inserted the rocking table 38 in the central through-section to which the inner diameter is set sufficiently larger than the rocking table 38, the needle bar pulley 61 is used for the swinging of the rocking table 38 and the needle bar 12. It is not disturbed.

The looper pulley 62 is fixedly mounted to the lower portion of the looper base 47 and pivots each looper 49 and 50 and the spreader together with the looper base 47.

In addition, the needle bar pulley 61 and the looper pulley 62 are both concentric with the metal 14, and are arrange | positioned so that it may turn around the common axis parallel to Z-axis direction.

Then, the swing motor 63 drives both the needle bar pulley 61 and the looper pulley 62 at the same rotation rate at the same time.

(Moving mechanism)

1 and 2, the moving mechanism 70 is disposed below the sewing needle 11 vertically, and has a cloth raising table 71 having a sewing surface on which the processing cloth is placed, and a cloth raising table. The presser foot 76 pressurized and held on the 71, the presser foot cylinder 72 (see FIG. 4) for switching between holding and releasing the presser foot 76, and the cloth lifter 71 are moved in the X-axis direction for positioning. An X-axis motor 73 (see Fig. 4), which is a pulse motor, and a Y-axis motor 74 (see Fig. 4), which is a pulse motor, which moves and positions the cloth lift table 71 in the Y-axis direction.

In the case of the buttonhole stitching of the eyelet hole, the cloth raising table 71 is conveyed at a predetermined pitch by driving of the Y-axis motor 74 at the straight part of the eyelet hole. The cloth is conveyed while aligning the needle drop position by the cooperation of the X-axis motor 73 and the Y-axis motor 74 so that the needle falls on the edge.

(Cloth cutting tool)

The cloth cutting mechanism includes a movable scalpel operating on the upper surface of the bed portion 2a, a fixed scalpel which is positioned in front of the moving direction of the movable scalpel and slides in contact with the movable scalpel to cut the upper thread, the lower thread and the screening, and the movable scalpel. A female cylinder 81 (see FIG. 4), which is an air cylinder that imparts a cutting operation, is provided.

(Inspection Guide)

The examination guide means 90 is provided above the longitudinal body portion 2b, and the examination is released from the failure portion as the examination supply source in which the city which maintains the actual winding of the examination is omitted. Supply between needle drop positions divided into two sides by needle vibration of cloth (C).

The judging guide means 90 includes a guide member 91 for guiding the examination released from the failure portion from the upper surface of the vertical body portion 2b to the side surface, and a judging guided to the guide member 91. The guide tube 92 which guides from the source of the part 2b to the vicinity of the looper base 47 in the bed part 2a is provided. In addition, the above-mentioned examination hole 48b of the needle plate 48 also functions as a part of the examination guide means 90.

The guide member 91 is a bracket provided with a through hole through which the screen is inserted, and is fixedly mounted on the side surface of the vertical body portion 2b.

The guide tube 92 has a tubular shape in which one end portion is opened upward from the vicinity of the vertical body portion 2b on the upper surface of the bed portion 2a, and the other end portion is opened near the looper base 47 in the bed portion 2a. It is upper body. The guide pipe 92 guides the insertion through the examination inside.

(Cloth cutting tool)

The cloth cutting tool is for forming buttonholes in the work cloth, and the cloth cutting scalpel for forming the water droplet-shaped cut line, the cloth cutting scalpel for forming the straight-shaped cut line, and the fabric cutting scalpel while placing the fabric It is provided with the scalpel base which is press-contacted from the upper side, and the cloth cutting motor 83 (refer FIG. 4) which is a stepping motor which raises and lowers each cloth cutting blade.

In the above fabric cutting tool, when the eyelet button hole stitch is performed, a droplet-type cloth cutting knife and a straight cloth cutting knife are used in combination, and when the simple straight button hole stitch without the eyelet part is used, the straight cloth is cut. Only a scalpel is used.

(Control system of buttonhole sewing machine)

In FIG. 4, the operation control means 100 includes a ROM 102 in which a program for executing various control or processing of the sewing machine is stored, a CPU 101 for executing various programs to perform a predetermined process or control, RAM 103 for storing various data at the time of execution of the CPU 101, EEPROM 107 as storage means in which various setting data necessary for sewing such as pattern data as sewing data, and the sewing machine motor 3 are recorded. The interface 3b for connecting the drive circuit 3a of the circuit to the CPU 101, the interface 73b for connecting the drive circuit 73a of the X-axis motor 73 to the CPU 101, and the Y-axis motor ( Interface 74b for connecting the drive circuit 74a of the 74 to the CPU 101, Interface 63b for connecting the drive circuit 63a of the swing motor 63 to the CPU 101, and the cloth cutting motor. The interface 83b connecting the drive circuit 83a of the 83 to the CPU 101 and the scalpel cylinder 81 serving as the power of the thread cutting movable blade are driven. The solenoid valve driving circuit 75a of the solenoid valve driving circuit 82a of the solenoid valve 82 to the CPU 101 and the solenoid valve 75 for switching the operation of the presser foot cylinder 72. Interface 75b for connecting the CPU 101 to the CPU 101, and an interface 106 for connecting the operation panel 104, the start switch 105, and the presser foot switch 108 to the CPU 101.

In addition, since the turning motor 63, the X-axis motor 73, the Y-axis motor 74, and the cloth cutting motor 83 are all stepping motors, it is necessary to perform an origin search. For this reason, these motors 63, 73, 74, and 83 are each provided with the home sensor which is not shown in figure, and each home sensor is connected to CPU101 via an interface.

The start switch 105 is a switch for executing the start of sewing.

The presser foot switch 108 is a switch for operating the presser foot cylinder 72 through the solenoid valve 75 so that the presser foot 76 pressurizes the workpiece fabric on the cloth lifter 71.

(Eyelet buttonhole stitch and its pattern data)

Next, the pattern data stored in the EEPROM 107 will be described. The pattern data is sewing data including various setting information necessary for buttonhole stitching, and pattern data is prepared corresponding to a plurality of sewing patterns, respectively.

First, various parameters required for the eyelet button hole stitch will be described based on the eyelet button hole stitch as an example based on FIG. 5.

As shown in Fig. 5 (a), in the eyelet button hole stitch, the button hole B is composed of a droplet portion BT and a straight portion BS extending from the tail portion of the droplet portion. Needle vibration needle stitches of the upper thread are formed to surround the button holes B. Needle vibration Needle stitch is composed of left and right side sewing parts formed on the left and right outer parts of the straight part BS, and eyelet sewing parts along the outside of the water droplet shape part BT. When the screening is used, the screening is supplied between the needle dropping positions of the left and right side sewing sections in the needle vibration of the upper thread so as to be sewn into the needle vibration needle stitches.

In the order of sewing, sewing is started from one side (right side in Fig. 5 (a)) of the side end opposite to the water droplet portion BT in the straight portion BS of the button hole B. A right straight section in which sewing is performed along the right side of the straight portion BS, followed by a left meandering section in which sewing is inclined along the right side of the tail portion of the water droplet BT, and then in a water droplet-shaped portion. A circular arc section in which sewing is performed along the semicircular shape of BT, a left meandering section in which sewing is inclined along the left side of the tail portion of the water drop portion BT, and sewing along the left side of the straight portion BS. Completion is done via the left straight section.

For reference, the right straight section, the right meandering section, the left straight section and the left meandering section are all sewn with uniform needle vibration width and feed pitch.

In the buttonhole sewing machine 10, when the eyelet buttonhole stitch is started, the operation control means 100 sewing at the sewing start end according to the needle vibration width of the needle bar 12 or the buttonhole B. At least one of the pitches (here, both sides) is narrower than the other sewing section, characterized in that the control to form a test holding needle stitch (H (test holding needle stitch section) for sewing). That is, at the sewing start end of the right straight section, which is the start position of the eyelet button hole stitch, the sewing of the examination holding needle stitch section H in which the stitch vibration width and the sewing pitch in the direction along the Y-axis direction are set smaller than each section is Additionally.

The parameter required for the eyelet button hole stitch is, as shown in Fig. 5 (b), the water droplet of the button hole B from the sewing start end of the first straight section not including the examination holding needle stitch section H; "Button hole stitch length (ml)" which is the length along the Y-axis direction to the circular end of BT, and the sum of the right straight section and the right meandering section (or the left straight section and the left meandering section). The total number of "parallel number of needles (ln)" which is the total number of needles, "the number of needles (en)" which is the total number of needles in the circular arc section, and the sum total of the right straight section (or left straight section). "Parallel section space | space ls" which is the distance from the straight part BS of the buttonhole B to the needle dropping position on the buttonhole side in needle vibration (the same value is adopted for each meandering section). Semicircular portion of droplet portion BT of buttonhole B in circular arc section "Eyelet female space (es)", which is the distance from the needle hole drop position to the buttonhole side from the needle vibration, and "Examination latch length (bl)", which is the length of the examination holding needle stitch section (H), and the examination maintenance. The "examination latching needle width (bn)", which is the total number of needles in the needle stitch section (H), and the "examination latching vibration width correction value (bw)", which is the difference in the needle oscillation width between the test holding needle stitch section (H) and another section, Can be mentioned. Each of these parameters is determined numerically by input from the operation panel 104.

In addition, as shown in the drawing of the water droplet portion BT of the buttonhole B shown in Fig. 5C, the width ew and the length el are also necessary parameters. As shown in Fig. 5 (d), these parameters have a size combination of ew and el set in advance, and a cloth cutting blade of a droplet shape corresponding to the combination is prepared, and the cloth cutting blade is selected by selecting a knife number. It is selected to cut the fabric.

For reference, the combination number 0 in FIG. 5 (d) is selected when a buttonhole stitch is performed in which both the width ew and the length el are zero, that is, the droplet part BT does not exist.

6 is an explanatory diagram showing the content of pattern data stored in the above-described EEPROM 107. Each pattern data includes a female number (data item 1), a buttonhole stitch length (ml) (data item 2), parallel needles (ln) (data item 3), and eyelet needles of the water droplets BT. (en) (data item 4), parallel mes space (ls) (data item 5), eyelet mes space (es) (data item 6), with or without cloth cutting operation, or before or after sewing. Set whether to execute (data item 7), judging length (bl) (data item 8), judging threading needle number (bn) (data item 9), and judging bolting oscillation width correction value (bw) (data item 10) is recorded.

In this manner, in the pattern data, as the positional information indicating each needle drop position of the examination holding needle stitch section H, the screening length of the stitching length bl, the number of lengths of the length of the screening stitching stitch bn, and the width of the screening lengthening vibration length correction value bw ) Is recorded, and the operation control means 100 forms the examination holding needle stitch section H in accordance with these information.

In addition, the items 1 to 10 are set and input individually from the operation panel 104.

(Operation Panel)

In Fig. 7, the operation panel 104 includes a data setting switch 104a for switching to a new setting or setting content update input mode of pattern data or exiting from an input mode, and the number of the pattern data currently selected in the input mode. The display panel 104b for displaying the display, the increase / decrease switch 104c for switching the selected pattern data, the display panel 104d for displaying the number of the currently selected setting item of the selected pattern data, and the setting item. Sewing mode in which sewing can be executed from the input mode, the increase / decrease switch 104e for switching, the display panel 104f for displaying the setting value of the parameter in the setting item, the increase / decrease switch 104g for switching the setting value, and the input mode. The preparation switch 104h for switching to is provided.

The configuration of the operation panel 104 enables setting input of each setting item of the pattern data. Since the pattern data is converted into needle stitch data (described later) for each needle drop position for each needle, the operation panel 104 sets position information indicating each needle drop position of the examination-holding needle stitch section (H). Function as a positioning means.

In addition, since the operation panel 104 can also set the length of the screening stitching length and the number of screening lengthening needles that are pattern data, it also functions as a section setting means for setting the number of stitches or the length of the screening needle stitch section H. Done.

(Needle stitch data)

The process of creating the needle stitch data performed by the operation control means 100 will be described.

When the pattern data for sewing is selected by the operation panel 104 in accordance with the processing program in the ROM 102, the CPU 101 expands the needle stitch data into the RAM 103 from the setting contents.

As described above, the pattern data is composed of parameters that can be set from the actual size of the size of each part when eyelet button hole stitch is performed. On the other hand, the CPU 101 performs drive control of the X-axis motor 73, the Y-axis motor 74, the turning motor 63 and the sewing machine motor 3, and the upper shaft 21 is at a predetermined angle. By driving the X-axis motor 73, the Y-axis motor 74, and the turning motor 63 at predetermined angles, the needle drop to each needle drop position shown in Fig. 5A is realized. For this reason, the CPU 101 is converting the pattern data into appropriate needle stitch data in order to more appropriately control the respective motors 73, 74, and 63.

That is, for example, the needle stitch data shown in Fig. 8 includes information for determining the operation amount of each motor 73, 74, 63 in the total number of needles for performing a series of eyelet button hole stitches. In Fig. 8, the needle drop (inner needle and outer needle) on both sides of the needle vibration is counted with one needle.

In Fig. 8, in the straight line section (e.g., the section having the number of needles 3 to 4), sewing is performed at a fixed needle vibration width by the needle vibration mechanism 30, so that the driving amount of the X-axis motor 73 is 0, Y-axis motor. The 74 is driven at a predetermined feed pitch every two needles, and the turning amount of the turning motor 63 is zero. In this case, the feed pitch by the Y-axis motor 74 is

((Button hole stitch length (ml))-((width of the droplet shape (ew)) ÷ 2)) ÷ (parallel number of needles (ln))

It is calculated from

In addition, in a meandering section (for example, a section having a needle number of 9 to 10), since it progresses at an angle, the X-axis motor 73 is driven every two needles, and the Y-axis motor 74 is driven every two needles at the same feed pitch as the straight section. The turning amount of the turning motor 63 is zero. In addition, the driving amount of the X-axis motor 73 gradually decreases in accordance with the shape of the droplet portion BT of the button hole B. FIG.

In addition, in the circular arc section (for example, the section with the needle number 11 to 18), since the one needle drop position in the needle vibration moves along the circular arc, the X-axis motor 73 and the Y-axis motor 74 move every two needles. It is driven by the driving amount according to the trajectory of the turning motor 63, the turning motor 63 is turned in a substantially constant amount for each needle.

In addition, in the examination holding needle stitch section (for example, the section having the number of needles 1 to 2), sewing is performed in a width smaller than the fixed needle vibration width by the needle vibration mechanism 30, so that the X-axis motor 73 is offset in the direction of needle vibration. Operate in the opposite direction. The amount of drive of the X-axis motor 73 at this time is calculated | required from the screen | vehicle clamping vibration width correction value bw. In addition, the Y-axis motor 74 is driven so that needle stitches of a predetermined feed pitch smaller than every other section are formed every two needles. The drive amount of the Y-axis motor 73 at this time,

(Judge Latches Length (bl)) ÷ (Judge Latches Needle (bn))

Calculated by

(Description of operation of eyelet button hole stitch sewing machine)

9 and 10, the operation of the eyelet button hole stitch sewing machine 10 will be described.

First, in the state where the main power is turned on, the CPU 101 determines whether the increase / decrease switch 104c of the pattern number of the operation panel 104 is pressed (step S1), and when it is pressed, changes the selection pattern data, and The display of the pattern number is also changed (step S2).

When the increase / decrease switch 104c is not pressed or when the change of the selection pattern data is completed, the CPU 101 determines whether or not the data setting switch 104a is pressed (step S3), and when pressed, the data setting process. (Step S4).

In addition, when it is not pressed or when the data setting process is completed, pressing of the preparation switch 104h is determined (step S5), and when it is not pressed, the process returns to step S1, and when pressed, the needle stitch data The process proceeds to the calculation processing of (step S6).

Here, the content of the data setting process will be described with reference to FIG.

Upon shifting to the data setting process, the CPU 101 first sets the data item number to 1 and displays "1" on the display panel 104d (step S21). In such a state, the female number whose setting item to set is 1 is selected (refer FIG. 6).

Next, the CPU 101 determines whether the increase / decrease switch 104e of the data item is pressed (step S22), and when it is pressed, increases or decreases the data item number of the display panel 104d in response to the increase / decrease input. The setting value of the parameter set corresponding to the displayed data item number is displayed on the display panel 104f (step S23).

Then, the CPU 101 determines whether the increase / decrease switch 104g for increasing or decreasing the parameter setting value is pressed when the increase / decrease switch 104e of the data item is not pressed or after the increase or decrease of the data item number is made. (Step S24) When pressed, the set value of the parameter displayed on the display panel 104f is increased or decreased in accordance with the selected data item (step S25).

In addition, when the increase / decrease switch 104g is not pressed or after the numerical value of the parameter is increased or decreased, the CPU 101 determines whether or not the data setting switch 104a is pressed (step S26).

If it is not pressed, the process returns to the processing of step S22. If it is pressed, the setting contents are determined, recorded as pattern data in the EEPROM 107, and the data setting processing is terminated (step S27).

When it is determined that the data setting switch 104a is not pressed after completion of the data setting process or in the process of step S3, the CPU 101 determines whether or not the preparation switch 104h is pressed (step S5).

If it is not pressed, the process returns to the processing of step S1. If it is pressed, needle stitch data is generated from the selected pattern data (step S6).

In addition, the CPU 101 performs home search by the respective home sensors of the X-axis motor 73 and the Y-axis motor 74, and positions the cloth lift table 71 of the moving mechanism 70 to a predetermined home position. Fit. At the same time, the home search is performed by the home sensor of the swing motor 63, and the needle bar and the looper are positioned to the predetermined home position (step S7). Further, the cutting position by the cloth cutting tool and the sewing position by the needle bar are arranged apart from each other in the Y-axis direction. When the cloth raising stand 71 is positioned at the origin position, the processing cloth is cut by the cloth cutting tool. It is set to be located at.

Next, the CPU 101 waits for the input of the presser foot switch 108 (step S8). That is, the determination of step S8 is repeated until the presser foot switch 108 is input, and if there is an input, operation control is performed to operate the presser foot cylinder 72 to lower the presser foot (step S9).

The CPU 101 waits for the input of the start switch 105 (step S10). That is, the determination of step S10 is repeated until the start switch 110 is inputted, and if there is an input, the scalpel operation selection setting set in the setting item 7 of the currently selected pattern data is read, and the pre-measured scalpel is read. It is determined whether or not it is the setting (setting to perform cloth cutting before sewing) (step S11).

In the case of the line scalpel setting, the CPU 101 drives the cloth cutting motor 83 to form the button holes by the cloth cutting blades (step S12).

After the button hole is formed or when it is determined in step S11 that the line scalpel is not set, the Y-axis motor 74 of the moving mechanism 70 is driven to set the sewing start position in the fabric on the cloth lifter 71. Operation control for positioning to the needle drop position by the needle bar 12 is performed (step S13).

Next, the CPU 101 drives the sewing machine motor 3 to execute needle drop at the same time as the needle vibration, and forms needle stitches of buttonhole stitches in accordance with the needle stitch data while achieving synchronization (step S14). At this time, the examination passes through the examination passage hole 48b of the needle plate through the guide member 91 and the guide tube 92, which are the examination guide means 90, and reaches the needle hole 48a in advance. It is in the state guided between two needle dropping points divided to both sides by. Accordingly, when the formation of the needle stitches starts, the examination is sewn into the needle vibration needle stitches of the upper thread formed by the needle vibration.

That is, the X-axis motor 73 and the Y-axis motor 74 are driven to form the examination holding needle stitch section H, and then each stitch stitch of the right straight section and the right meandering section is formed in order, and then X The axis motor 73, the Y axis motor 74, and the turning motor 63 are driven to form an arc section. Finally, the X axis motor 73 and the Y axis motor 74 are driven to drive the left meandering section. By forming the left straight section, all stitches of the buttonhole stitch are formed. That is, the examination holding needle stitch section H is additionally formed outside the needle stitch of the buttonhole stitch. In addition, this additionally formed examination holding needle stitch section H can be concealed in the needle stitch by forming the stitching stitch stitch overlapping after forming the stitch stitch of the buttonhole stitch.

Subsequently, the CPU 101 performs the home search by the respective home sensors of the X-axis motor 73 and the Y-axis motor 74 again to position the cloth lift table 71 of the moving mechanism 70 to the home position. do. At the same time, the home search is performed by the home sensor of the swing motor 63, and the needle bar and the looper are positioned at the predetermined home position (step S15).

Further, the CPU 101 reads again the scalpel operation selection setting set in the setting item 7 of the currently selected pattern data, and determines whether it is a post scalpel setting (setting to perform cloth cutting after sewing). It is judged whether or not (step S16).

Then, in the case of post scalpel setting, the CPU 101 drives the cloth cutting motor 83 to form buttonholes with each cloth cutting blade (step S17).

If it is determined after the buttonhole formation or at step S16 that it is not set to the post scalpel, sewing is completed and the process returns to step S8 to wait for execution of a new button hole stitch.

(Effect of Embodiment)

In the button-hole sewing machine 10, the operation control means 100, at the sewing start end, so that the needle vibration width and sewing pitch of the needle bar 12 is narrower than other sewing sections to sew, so as to sew. Each motor 73, 74 is controlled to form the examination holding needle stitch section H. As a result, a narrower width of the needle vibration needle stitch or a plurality of needle vibration needle stitches formed more densely in the cloth conveying direction can be formed at the sewing start end, so that the sewing start end of the examination is more firmly maintained so as not to be pulled out easily. can do. For this reason, even if the screening and the upper thread are slippery materials or the width of the overlock stitch or sewing pitch is wider than the thickness of the screening, even if the width of the overlock stitch or the sewing pitch is wide, the fall of the screening can be reduced more effectively. You can stitch.

In addition, in the pattern data, " screening length of the stitching length bl ", " screening lengthening needle number bn " and " screening lengthening vibration amplitude correction value " (bw) ", thereby forming the examination holding needle stitch section (H), so that the examination is eliminated by software processing such as setting or correcting pattern data without design change or addition of a new configuration for each mechanism of the sewing machine. It is possible to easily realize an appropriate buttonhole stitch with reduced number.

Further, since the buttonhole sewing machine 10 has an operation panel 104 for setting position information indicating each needle drop position for all sections including the examination holding needle stitch section H, in particular, the examination holding needle stitch section ( The width of the overlock stitch and the sewing pitch of H) can be set arbitrarily, so that an appropriate examination holding needle stitch section can be set for various kinds of examinations or for various kinds of buttonhole stitch patterns.

(Etc)

For the pattern data, the length of the screening stitching length and the number of screening stitches is set as a setting item. Instead, a combination of the screening length of the screening stitching length and the screening length of the screening stitching (sewing pitch of the screening needle stitch section H) is used. It may be a setting item, or the combination of the screening pitching pitch and the number of screening latching needles may be a setting item.

In addition, although the setting item of the examination | attachment stitching vibration width value is inputting the correction value with respect to the needle vibration width of another section, you may input the value of the needle vibration width itself in the examination holding needle stitch section H. In this case, it is necessary to set and input the fixed needle vibration width in the needle vibration mechanism 30 with respect to the operation control means 100 in advance, and to the value of the fixed needle vibration width and the examination holding needle stitch section H. The amount of correction operation by the X-axis motor 73 in the needle vibration is obtained from the difference in the value of the needle vibration width in the case.

The needle vibration mechanism 30 may be provided with a drive source (motor) for vibrating the needle or a drive source (motor) for adjusting the needle vibration width. In this case, the cloth lift table by the X-axis motor 73 ( Operation control for correcting the needle vibration width in accordance with the movement of 71 may be unnecessary.

In the button hole stitch, sewing is formed to additionally form the examination holding needle stitch section (H) in front of the sewing start end of the conventional button hole stitch, which is conventionally performed. You may sew so that a section H may be included. That is, the needle vibration width and the sewing pitch may be narrowed and sewn from the start of sewing in the sewing section of the conventional button hole stitch to the predetermined number of needles.

In addition, the buttonhole sewing machine 10 includes data specifying the needle dropping position for forming the examination holding needle stitch section H in the pattern data, whereby the operation control means 100 controls each part. If the examination holding needle stitch section (H) is formed, but the same sewing can be performed, there is no need to be particularly limited to such a method.

For example, the operation control means 100 has the examination holding needle stitch section for the pattern data for forming each sewing section of the normal buttonhole stitch which has been performed since the end not including the examination holding needle stitch section H. It may be made to have the examination holding needle stitch section forming part which controls to sew and convert to sewing, or may control as a examination holding needle stitch section forming part.

More specifically, the operation control means 100 includes the needle for some sections from the start of sewing to the first few stitches in the pattern data or the needle stitch data which do not include the parameter relating to the examination holding needle stitch section H. For example, by converting the vibration width and the sewing pitch by a predetermined ratio or by subtracting by a predetermined value, the section is converted into the examination holding needle stitch section H.

In addition, the operation control means 100 performs the needle oscillation width or sewing from the needle oscillation width or sewing pitch in any section of the pattern data or the needle stitch data that does not include the parameter relating to the examination holding needle stitch section H. The process of adding the data of the examination holding needle stitch section H obtained by reducing the pitch at a predetermined rate or by subtracting by a predetermined value to the pattern data or the needle stitch data may be performed.

In addition, in the above-described embodiment, the operation control means 100 differs both the needle vibration width of the needle bar 12 and the sewing pitch along the buttonhole B at the sewing start end at the start of the eyelet button hole stitch. Screening needle stitch section (H) for sewing by narrowing than the sewing section is formed, but any one of the needle vibration width of the needle bar 12 and the sewing pitch according to the button hole (B) narrower than the other sewing section screening needle stitch section (H) may be formed.

In addition, in this embodiment, although the sewing machine 10 was demonstrated using the eyelet buttonhole stitch as an example, you may sew by providing the examination holding needle stitch section in the buttonhole stitch which is not an eyelet.

In addition, as shown in Fig. 11, even when a buttonhole stitch having a tapered bar threading section K for tapered bartacking is performed, an examination holding needle stitch section Ha is provided at the end of sewing. You may sew it.

1 is a side cross-sectional view showing a portion of a buttonhole sewing machine according to an embodiment of the present invention.

2 is a side view of the buttonhole sewing machine viewed from the opposite side of FIG.

3 is a plan view of the needle plate mounted on the sewing machine.

4 is a block diagram showing a control system of a buttonhole sewing machine.

Fig. 5 (a) is an explanatory diagram showing various parameters to be set in the eyelet button hole stitch, Fig. 5 (b) is a table listing various parameters except the size of the water drop portion, and Fig. 5 (c) is a water drop shape. It is explanatory drawing which showed the parameter which determines the size of a part, and FIG. 5 (d) is a table | sequence which lists the combination of the size of a water droplet part.

6 is an explanatory diagram showing a data configuration of pattern data.

7 is an explanatory diagram showing a configuration of an operation panel.

8 is an explanatory diagram showing a data configuration of needle stitch data.

Fig. 9 is a flowchart showing the process from the data setting of the eyelet button hole stitch sewing machine to the sewing completion.

10 is a flow chart showing in more detail the data setting operation of the eyelet button hole stitch sewing machine.

Fig. 11 is an explanatory view showing a state in which the examination holding needle stitch section Ha is added to the needle stitches of the buttonhole stitches for taper-seaming.

Explanation of symbols on the main parts of the drawings

10: buttonhole sewing machine 11: sewing needle

12: needle bar 20: Shanghai Dong mechanism

30: needle vibration mechanism 40: looper mechanism

48: needle plate 70: moving mechanism

90: examination guide means 100: motion control means

104: operation panel (position setting means, section setting means)

107: EEPROM

H: Screening needle stitch section

Claims (6)

A needle bar for holding a sewing needle having a hole through which the upper thread is inserted; A shandong copper mechanism for shanghaiing the needle bar; A needle vibration mechanism for swinging the needle bar in a direction intersecting the longitudinal direction of the button hole formed in the processing cloth; With the looper mechanism which forms needle stitch in the processing cloth by cooperation with a needle bar, A moving mechanism for moving the fabric in a direction perpendicular to the vertical direction of the sewing needle; An examination guide means for guiding an end of the examination supplied from the examination supply source between the needle vibration needle stitches formed according to the needle vibration of the needle vibration mechanism; Storage means for storing sewing data for forming stitches of buttonhole stitches having at least left and right side sewing portions around the buttonholes; Control means for controlling the respective mechanisms based on the sewing data to form stitches of buttonhole stitches around the buttonholes A buttonhole sewing machine comprising: The control means controls to form the needle-holding needle for sewing by narrowing at least one of the needle vibration width or the sewing pitch of the needle bar in the side sewing portion at the sewing start end of the needle stitch of the button hole stitch. A buttonhole sewing machine, characterized in that performed. The method of claim 1, And at least one of the needle vibration width of the needle bar or the sewing pitch is smaller than the needle stitches of the buttonhole stitches to set sewing data of the examination holding needle stitches for sewing, And said control means controls at the sewing start end of said buttonhole stitch to additionally form an examination holding needle stitch based on sewing data of said examination holding needle stitch. The method of claim 2, And said sewing data of said examination holding needle stitches has positional information indicating respective needle dropping positions of said examination holding needle stitches of a predetermined section. The method of claim 1, And a position setting means for setting position information indicating each needle drop position of the examination holding needle stitches. The method of claim 1, And a section setting means for setting the number of needles or the length of the examination holding needle stitches. The method of claim 1, The control means, the buttonhole put, characterized in that for sewing data that does not contain the position information indicating each needle drop position of the examination holding needle stitches to automatically sewing to sewing with the examination holding needle stitches to perform sewing. Sewing machine.

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