JP2010220929A - Hole sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holing machine accurately and surely forming a buttonhole in a desired position of work cloth intended by an operator. <P>SOLUTION: The holing machine M has a cutter 51 installed to freely advance/retreat with respect to a machine frame of the sewing machine M and constituted to advance/retreat along the major axis direction of a formed buttonhole seam 60. The cutting position of the work cloth by the cutter 51 in the major axis direction of the buttonhole seam 60 can thereby be freely set without depending on only the cloth feeding action of a cloth feed mechanism 10. Consequently, the cutter 51 can be accurately lowered to the desired position of the work cloth intended by the operator, and a buttonhole 65 can be formed accurately and surely. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a boring machine, and more particularly, to a boring machine in which a button hole having a desired length is formed by one or more cutter drops.

  In general, a hole sewing machine has cloth feeding means for feeding a work cloth, sewing means for forming a hole seam on the work cloth, and button hole forming means for forming a button hole by cutting the work cloth. ing. The cloth feeding means feeds the work cloth, and the sewing means moves the sewing needle up and down. The hole sewing machine forms a hole seam with the cloth feeding direction and the sewing means as a major axis direction of the cloth feeding direction.

  In such a hole sewing machine, conventionally, a hole sewing machine has been proposed in which a button hole having a desired length is formed by a plurality of cutter drops (see, for example, Patent Document 1). This makes it possible to form button holes of different lengths without changing the cutter.

Japanese Patent Laid-Open No. 11-128578

  In the above-described prior art sewing machine, when sewing a stitched seam composed of a pair of tacking portions and a pair of staggered portions, the cutter is lowered while the staggered portion is being sewn. Become. In this case, for example, when the stitch pitch of the staggered portion is large, or when the rotation speed of the sewing machine motor is high, the cutter moves down from the standby position and cuts the work cloth within a short time. There is a possibility that the work cloth is moved by cloth feeding, and the accuracy of the position where the button hole is formed is lowered.

  An object of the present invention is to provide a hole sewing machine capable of accurately and reliably forming a button hole at a desired position of a work cloth intended by an operator.

  In order to achieve the above object, the boring machine according to the first aspect of the present invention comprises a cloth feeding means for feeding the work cloth, a sewing means for moving the work cloth up and down, and forming a hole seam on the work cloth, A button hole forming means having a cutter for cutting a cloth to form a button hole, and the button hole is formed by one or a plurality of descending operations of the cutter based on the length of the cutter and the length of the button hole. In the hole sewing machine comprising the cloth feeding means, the sewing means, and the control means for controlling the button hole forming means to form the button hole forming means, the button hole forming means has the cutter as a machine frame of the sewing machine. On the other hand, it is characterized in that it is provided so as to be able to advance and retreat along the long axis direction of the hole stitch.

  The boring machine according to the first invention of the present application has cloth feeding means and sewing means. Based on the control of the control means, the cloth feed means feeds the work cloth, and the sewing means moves the sewing needle up and down to form a hole seam in the work cloth, so that the hole feed has the cloth feed direction as the major axis direction. Form seams.

  The boring machine according to the first aspect of the present invention further includes button hole forming means. Based on the control of the control means, the button hole forming means lowers the cutter once or a plurality of times to cut the work cloth, thereby forming the button hole.

  In the first invention of the present application, the cutter is installed so as to be able to advance and retract with respect to the machine frame of the sewing machine, and can be advanced and retracted along the long axis direction of the hole stitch formed as described above. Thereby, the cutting position of the work cloth by the cutter in the long axis direction of the hole stitching can be freely set without depending only on the cloth feeding operation by the cloth feeding means.

  As a result, it is possible to finely adjust and set the cutting position of the work cloth, and further to correct the setting according to the sewing speed and sewing conditions. In addition, when sewing a stitched seam consisting of a pair of barbs and a pair of staggered parts, the cutter is lowered when sewing a barb that has a smaller fabric feed pitch than when the staggered part is sewn. It is also possible to control to cut. As a result, the button hole can be accurately and reliably formed at a desired position on the work cloth intended by the operator.

  According to a second aspect of the present invention, in the first invention, the button hole forming means includes a cutter vertical movement drive mechanism including a first actuator for moving the cutter up and down, and a mechanism for moving the cutter forward and backward. And a cutter advancing / retreating drive mechanism including a second actuator.

  In the hole sewing machine according to the second invention of the present application, the button hole forming means includes not only a cutter vertical movement drive mechanism for moving the cutter up and down by the first actuator, but also a cutter advance / retreat drive mechanism. Accordingly, the cutter can be advanced and retracted along the long axis direction of the stitched seam using the driving force of the second actuator.

  According to a third aspect of the present invention, in the second invention, the cutter vertical movement drive mechanism includes a first holding member for rotatably holding a first attachment member for attaching the cutter, A first vertical movement link mechanism that moves the first holding member up and down by a driving force of one actuator, and the cutter advance / retreat driving mechanism rotates the first attachment member by a driving force of the second actuator. The rotation link mechanism, and a conversion mechanism that converts a rotation operation of the first attachment member into an advance / retreat operation along a long axis direction of the hole stitch of the cutter.

  In the boring machine according to the third aspect of the present invention, the first mounting member for mounting the cutter is held by the first holding member, and the first vertical movement link mechanism of the cutter vertical movement drive mechanism is first with respect to the first holding member. The driving force of the actuator is transmitted to move the first holding member up and down. Thereby, the cutter can be lowered with respect to the work cloth.

  The first holding member rotatably holds the first attachment member, and the rotation link mechanism of the cutter advance / retreat driving mechanism transmits the driving force of the second actuator to the first attachment member to rotate it. The conversion mechanism of the cutter advance / retreat drive mechanism converts the rotation operation of the first mounting member into the advance / retreat operation, whereby the cutter can be advanced / retreated along the long axis direction of the stitched seam.

  According to a fourth aspect of the present invention, in the second invention, the cutter vertical movement drive mechanism is configured to operably connect a second attachment member for attaching the cutter so that the cutter can be moved forward and backward. A second vertical movement link mechanism that moves the second attachment member up and down is further provided, wherein the cutter advance / retreat drive mechanism holds a second holding member that can move up and down and a driving force of the second actuator. And a forward / backward link mechanism for moving the second holding member forward / backward.

  In the hole sewing machine of the fourth invention of the present application, the second vertical movement link mechanism of the cutter vertical movement drive mechanism is operatively connected to the second attachment member for attaching the cutter, and the driving force of the first actuator is transmitted. The second mounting member is moved up and down. Thereby, the cutter can be lowered with respect to the work cloth.

  The second holding member holds the second mounting member so as to be movable up and down. The advance / retreat link mechanism of the cutter advance / retreat drive mechanism transmits the driving force of the second actuator to the second holding member, and the second holding member is moved. Advance and retreat. As a result, the cutter can be advanced and retracted along the long axis direction of the seam.

  The boring machine according to a fifth aspect of the present invention is the sewing machine according to any one of the second to fourth aspects, wherein the sewing means is a part of the front tacking portion, the forward staggered portion, the back tacking portion, The hole stitch is formed in the order of the staggered portion and the front tacking portion, and the control means is configured to sew the front tacking portion after the sewing means has stitched the return staggered portion. The cloth feeding means, the sewing means, and the button hole forming means are controlled so that the cutter is lowered to form the button hole.

  In the boring machine according to the fifth aspect of the present invention, the sewing means performs sewing according to the cloth feed of the work cloth by the cloth feed means. That is, the sewing means forms a part of the front tack stop portion on the work cloth, and then forms the forward zigzag portion, the back tack stop portion, and the return zigzag portion in this order, and finally the rest of the front tack stop portion. Form the part and complete the hole seam. Since the staggered portion is formed along the long axis direction on the short axis side portion of the button hole, the cloth feed pitch becomes large. Therefore, when the zigzag portion is sewn, the cloth feed speed of the work cloth by the cloth feed means is large. On the other hand, the tacking portion is formed at the end of the button hole in the long axis direction, and when the tacking portion is sewn, the cloth feeding speed of the work cloth by the cloth feeding means is small (the cloth feeding pitch is smaller than the staggered portion). Because it is small).

  When the cutter is lowered during sewing of the staggered portion where the fabric feed speed is large (the fabric feed pitch is large), the work cloth is fed by the fabric feed during a short time from when the cutter descends from the standby position to cut the work cloth. There is a fear that the position of the button hole is lowered and the accuracy of the position is reduced. Further, when the cutter is lowered, the work cloth is pulled by the cutter, which may adversely affect the stitching of the staggered portion. Furthermore, when the sewing machine is decelerated to prevent the pulling, the cycle time increases. In the fifth invention of the present application, by lowering the cutter when sewing the front tacking portion after sewing the staggered portion where the fabric feed speed (cloth feed pitch) is particularly small, the above-mentioned adverse effects can be avoided reliably and with high accuracy. In addition, the button hole can be formed at a desired position without increasing the cycle time.

  According to a sixth aspect of the present invention, in the fifth invention, the control means sequentially reads a plurality of pieces of sewing data in which coordinate values of a large number of needle drop positions defining a sewing pattern are digitized and arranged in the sewing order, And controlling the cloth feeding means and the sewing means so as to form the corresponding stitched seam based on the sewing data, and at least one of the front tack stop portions after sewing the staggered portion. An identifier setting means for setting a lowering identifier for lowering the cutter with respect to sewing data is provided.

  In the boring machine of the sixth invention of the present application, the control means controls the sewing means while reading the sewing data one after another, and executes the sewing. The sewing means lowers the sewing needle at the needle drop position described in each sewing data, and performs sewing on the work cloth.

  The identifier setting means uses the above-mentioned sewing data to control the lowering of the cutter, and sets the lowering identifier to the sewing data at the time of sewing the front tacking portion after sewing the staggered portion. As a result, the control means can instruct the buttonhole forming means to lower the cutter based on the lowering identifier at the sewing timing of the appropriate needle drop position of the front tacking stop.

  According to a seventh aspect of the present invention, there is provided the hole sewing machine according to the sixth aspect, wherein the control means drives the cutter up and down to lower the cutter when the read sewing data sets the lowering identifier. An instruction signal is output to the mechanism.

  In the boring machine according to the seventh aspect of the present invention, when the lowering identifier is set in the sewing data, an instruction signal is output to the vertical movement drive mechanism of the button hole forming means at the sewing timing of the corresponding needle drop position, and the lowering of the cutter is performed. Give instructions. Thereby, the cutter can be lowered in conjunction with the timing of moving the sewing needle up and down during sewing, and the work cloth can be cut. By performing the cutting with the cutter during the sewing operation in this manner, the entire processing time can be shortened as compared with the case of performing the cutting with the cutter after the sewing is completely completed.

  According to the eighth or seventh aspect of the present invention, there is provided the moving position setting means for setting the coordinate value of the needle drop position of the sewing data in which the lowering identifier is set to the movement position of the cutter in the sixth or seventh invention. The control means controls the cutter advance / retreat driving mechanism so as to move the cutter to the movement position set by the movement position setting means.

  The drilling machine according to the eighth invention of the present application has a moving position setting means. In order to lower the cutter in conjunction with the sewing execution timing at the appropriate needle drop position as described above, the movement position setting means moves the needle drop position coordinate value of the sewing data with the lowering identifier set to the movement of the cutter. Set to position. The control means controls the cutter advance / retreat driving mechanism, and moves the cutter to the movement position of the cutter set by the movement position setting means as described above.

  Thus, the cutter can be moved in advance to the movement position corresponding to the sewing execution timing before the sewing execution timing at the needle drop position corresponding to the lowering of the cutter actually arrives.

  As a result, compared to the case where the cutter is moved to the corresponding position and lowered after the sewing execution timing at the needle drop position has arrived, only the lowering needs to be performed at that timing, so the movement position corresponding to the sewing execution timing can be accurately set. The cutter can be lowered. Therefore, it is possible to form the button hole 65 more reliably and with high accuracy.

  According to a ninth aspect of the present invention, there is provided the hole sewing machine according to the eighth aspect, further comprising movement position correction means for correcting the movement position set by the movement position setting means.

  The boring machine according to the ninth aspect of the present invention has a movement position correcting means. Thereby, the moving position of the cutter set by the moving position setting means can be further finely adjusted according to the sewing speed and sewing conditions. As a result, it is possible to form the button hole with higher accuracy.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, the movement position correcting means includes a rotational speed of a sewing machine motor, a cloth feed speed of the cloth feed means, a cloth feed pitch of the cloth feed means, The correction amount of the movement position is determined according to at least one of the type and the type of sewing thread.

  When the rotation speed of the sewing machine motor or the cloth feed speed is high (when the cloth feed pitch is large), the work cloth moves in a short time from when the cutter descends from the standby position to cut the work cloth. There is a possibility that the position where the button hole is originally formed and the lowering position of the cutter are shifted. Further, depending on the type of work cloth or sewing thread, there is a possibility that a shift similar to the above may occur due to the influence of friction or the like. In the boring machine according to the tenth invention of the present application, the moving position correction means determines and cancels the correction amount corresponding to the sewing machine motor rotation speed, cloth feed speed, cloth feed pitch, work cloth / sewing thread type, and the like. The influence of the above-described deviation can be avoided. As a result, it is possible to form the button hole with higher accuracy.

  According to the present invention, a button hole can be accurately and reliably formed at a desired position on a work cloth intended by an operator.

It is a perspective view showing the whole structure of a hole sewing machine of this embodiment. It is a side view showing the structure of the sewing needle and cutter part of a sewing machine. It is a perspective view showing the whole structure of a cloth feed mechanism. It is a perspective view showing the whole structure of a sewing mechanism. It is the perspective view which looked at the whole structure of the button hole formation mechanism from diagonally upward. It is the perspective view which looked at the whole structure of the button hole formation mechanism from diagonally downward. It is a figure showing the vertical movement operation | movement of the cutter by a cutter vertical movement drive mechanism. It is a figure showing the advance / retreat operation | movement of the cutter by a cutter advance / retreat drive mechanism. It is a functional block diagram showing the control system of a hole sewing machine. It is a top view of the hole stitch formed by the hole sewing machine. It is a figure for demonstrating the parameter item set when forming a hole stitch. It is a flowchart showing the control content performed when a control apparatus sets a cutter ON flag. It is a flowchart showing the control content performed when a control apparatus sets a cutter ON flag. It is a figure showing an example of sewing data, cutter coordinates, and the like. It is a flowchart showing the control content which a control apparatus performs when forming a hole stitch based on the set some sewing data and cutter ON flag. It is a flowchart showing the control content regarding the cutter which a control apparatus performs when forming a boring stitch based on the set some sewing data and cutter ON flag. It is the perspective view which looked at the whole structure of the modification of the button hole formation mechanism from diagonally upper right direction. It is the perspective view which looked at the whole structure of the modification of a buttonhole formation mechanism from diagonally upper left. It is a figure showing the vertical movement operation | movement of the cutter by the cutter vertical movement drive mechanism in the modification of a button hole formation mechanism. It is a figure showing the advance / retreat operation | movement of the cutter by the cutter advance / retreat drive mechanism in the modification of a button hole formation mechanism. It is a figure for demonstrating the parameter item in the modification which correct | amends a cutter coordinate position. It is a flowchart showing the control content performed when a control apparatus sets a cutter ON flag in the modification which correct | amends a cutter coordinate position. It is a figure showing the specific examples, such as sewing data set in the modification which corrects a cutter coordinate position, and cutter coordinates.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In the present embodiment, the present invention is applied to a so-called buttonhole sewing machine that forms a hole seam 60 shown in FIG. 10 on a work cloth and forms a button hole 65 inside the hole seam 60. This is an example of applying. In the following description, the front-rear and left-right directions of the boring machine are the directions indicated by the arrows in FIGS.

  As shown in FIG. 1, the boring machine M is for starting or stopping a sewing machine table 1, a sewing machine motor 2 provided on the sewing machine table 1, and each drive unit (described later) including the sewing machine motor 2. A foot pedal 3, an operation panel 4 for inputting and setting a plurality of parameters (which will be described later) for defining the shape and size of the hole seam 60, a control device 5 for driving and controlling each drive unit, and a sewing machine It has a main body 100 and the like.

  The sewing machine body 100 includes a bed portion 6, a pedestal column portion 7, and an arm portion 8. As shown in FIGS. 2 to 6, the sewing machine main body 100 includes a cloth feed mechanism 10 (equivalent to a cloth feed means) that feeds a work cloth back and forth, and a sewing needle 32 that moves up and down, and holes the work cloth. Cutting a work cloth provided to the sewing mechanism 30 (corresponding to the sewing means) for forming the seam 60 and the machine frame of the sewing machine main body 100 so as to be able to advance and retreat along the long axis direction of the hole seam 60. A button hole forming mechanism 50 (corresponding to a button hole forming means) having a cutter 51 for forming a button hole 65 is provided. The control device 5 (corresponding to the control means) is configured to form the button hole 65 based on the length of the cutter 51 and the length of the button hole 65 so that the button hole 65 is formed by the descent operation of the cutter 51 one or more times. The feed mechanism 10, the sewing mechanism 30, and the button hole forming mechanism 50 are controlled.

  As shown in FIG. 3, the cloth feed mechanism 10 includes a feed base 11, a presser foot 12, a stepping motor 13, and the like. The cloth feed mechanism 10 integrally drives the work cloth by driving the feed base 11 and the presser foot 12 back and forth integrally with the stepping motor 13 while the work cloth is pressed against the feed base 11 by the presser foot 12. Feed the cloth back and forth. A pair of left and right guide plates 14 fitted in the upper surface portion of the bed portion 6 guide the feed base 11 formed in a plate shape long in the front and rear directions so as to be movable in the front and rear directions. The feed base 11 has a needle hole 11 a for forming a hole seam 60 and a button hole 65 at a front end portion thereof.

  A movable member 15 is connected to the lower surface of the rear end of the feed base 11. A movable member 17 is connected to the rear side of the movable member 15 via a connecting rod 16 that is long in the front-rear direction. A rear end portion of a presser arm 18 having a presser foot 12 attached to the front end portion is supported by the movable member 17 around a left and right axis. The cloth feed mechanism 10 urges the presser foot 12 downward via a presser arm 18 by an urging member (not shown), and presser arm by a presser lifting mechanism (not shown) driven by operation of the foot pedal 3. The presser foot 12 moves up and down integrally with 18. The presser lifting / lowering mechanism includes a presser foot stepping motor 22 (see FIG. 9) that controls driving so that the presser foot 12 can be raised and lowered and its height can be adjusted according to the operation amount of the foot pedal 3.

  The connecting rod 16 extends forward and backward through the left ends of the movable members 15 and 17. The pair of bearings 19 support the connecting rod 16 so as to be movable forward and backward on the front side of the movable member 15 and the rear side of the movable member 17. The long rod 20 is fixed to the sewing machine frame on the right side of the connecting rod 16. The right end of the movable member 17 supports the rod 20 through the bearing 17a so as to be movable back and forth. The drive pulley 13 a is fixed to the output shaft of the stepping motor 13. A driven pulley (not shown) is supported on the sewing machine frame behind the drive pulley 13a, and both pulleys hang an endless belt 21. The movable member 17 is connected to a part of the belt 21, and when the stepping motor 13 is driven, the movable members 15, 17, the feed base 11, and the presser foot 12 are integrally driven forward and backward through the belt 21.

  As shown in FIGS. 2 and 4, the sewing mechanism 30 includes a needle bar 31, a sewing needle 32, a thread tension mechanism 34, a balance 35, and the like. The sewing needle 32 is attached to the lower end of the needle bar 31. The thread tension mechanism 34 applies tension to the upper thread 33 in the upper thread supply path from the upper thread supply source (not shown) to the sewing needle 32. The balance 35 is provided between the thread tension mechanism 34 and the sewing needle 32, and tightens the upper thread 33. The sewing machine motor 2 drives a needle bar vertical movement mechanism (not shown). The needle bar vertical movement mechanism reciprocates the needle bar 31 and the sewing needle 32 up and down. A yarn catcher (not shown) is provided in the bed portion 6. The thread catcher (not shown) captures an upper thread 33 in the vicinity of the sewing needle 32 that moves up and down on the lower side of the feed base 11 and entangles it with a lower thread extending from a bobbin (not shown) to form a stitch.

  A needle bar left / right swinging stepping motor 36 (corresponding to the second actuator, see FIG. 9) generates a driving force for swinging the needle bar 31 left and right. In the hole sewing machine M, the needle bar 31 is driven to swing left and right, and the cloth feed mechanism 10 feeds the work cloth back and forth, so that a hole seam 60 having a lateral width is sewn on the work cloth. The balance 35 is reciprocated up and down by a balance drive mechanism (not shown) that is mostly shared with the needle bar up-and-down mechanism driven by the sewing machine motor 2, and the ascending balance 35 pulls the upper thread 33 and the thread tension mechanism 34. Frictional resistance is applied to the upper thread 33 to apply tension, and the seam formed on the work cloth is tightened.

  As shown in FIG. 4, the thread tension mechanism 34 includes a first thread tension tray 40, a second thread tension tray 41, and an auxiliary thread tension tray 42. The thread guide members 33a and 33b guide the upper thread 33 of the upper thread supply source to the first thread tension tray 40. The upper thread 33 passing through the first thread tension tray 40 reaches the sewing needle 32 via the auxiliary thread tension tray 42, the second thread tension tray 41, the thread guide member 33c, the balance 35, and the guide members 33d and 33e in this order. The first thread tension tray 40 and the auxiliary thread tension 42 are in a tension application state in which tension is constantly applied to the upper thread 33. The first thread tension tray 40 can be switched between a tension application state and a tension release state. The switching is performed by a tension switching mechanism (not shown) having a thread loosening solenoid 45 (see FIG. 9).

  FIG. 5 is a perspective view of the entire structure of the button hole forming mechanism 50 as viewed obliquely from above, and FIG. 6 is a perspective view as viewed from obliquely downward. FIG. 6 also shows a partially enlarged view of the conversion mechanism 95. As shown in FIGS. 5 and 6, the button hole forming mechanism 50 includes a cutter vertical movement drive mechanism 80 including a cutter driving solenoid 81 (corresponding to a first actuator) for moving the cutter 51 up and down, and the cutter 51. And a cutter advance / retreat drive mechanism 90 provided with a cutter advance / retreat stepping motor 91 (equivalent to a second actuator).

  The cutter vertical movement drive mechanism 80 includes a cylinder member 82, a cutter guide member 98, a first cutter mounting shaft 53 (corresponding to a first mounting member), and a first shaft holding member 83, in addition to the cutter driving solenoid 81. (Corresponding to a first holding member) and a first vertical movement link mechanism 84. The first cutter mounting shaft 53 is inserted into the cylindrical member 82 and is rotatable in the circumferential direction within the cylindrical member 82. The first shaft holding member 83 supports the cylindrical member 82 at a substantially intermediate portion of the cylindrical member 82. The cylindrical member 82 has a cutter guide member 98 fixed to the lower end. The cutter guide member 98 is formed of a plate-like member and has a rail portion 98a described later on the lower surface. The first vertical movement link mechanism 84 moves the first shaft holding member 83 up and down by driving the cutter driving solenoid 81.

  The first vertical movement link mechanism 84 includes a substantially L-shaped cutter operating arm 85 and a spring member 86 that urges the front end portion of the cutter operating arm 85 upward. The support shaft 85a supports the cutter operating arm 85 so as to be swingable about the axis with respect to the sewing machine frame. The cutter operating arm 85 has a front end portion rotatably connected to the first shaft holding member 83. The rear upper end portion of the cutter operating arm 85 is connected to a plunger 81 a protruding forward from the cutter driving solenoid 81.

  The cutter vertical movement drive mechanism 80 has a cutter operating arm 85, a first shaft holding member 83, a cylindrical member 82, a first cutter mounting shaft 53, and a cutter guide as the plunger 81a of the solenoid 81 for driving the cutter protrudes / withdraws. A cutter 51 described later can be moved up and down via the member 98.

  The cutter advance / retreat drive mechanism 90 includes a rotation link mechanism 92 and a conversion mechanism 95 in addition to the cutter advance / retreat stepping motor 91. The rotation link mechanism 92 has a first rotation shaft 93 and a second rotation shaft 94. The first rotation shaft 93 is connected at its left end side to an output shaft 91a protruding upward from the cutter stepping motor 91. The second rotation shaft 94 is connected to the right end side of the first rotation shaft 93 so as to be slidable and rotatable in the axial direction via the slider 93a, and the right end side of the second rotation shaft 94 is connected to the first cutter mounting shaft. 53. The rotation link mechanism 92 rotates the first cutter attachment shaft 53 by the driving force of the cutter advance / retreat stepping motor 91.

  The conversion mechanism 95 includes a rotation member 96 and an advance / retreat member 97. The rotation member 96 is connected to the lower end portion of the first cutter attachment shaft 53 and rotates together with the rotation operation of the first cutter attachment shaft 53. The rotating member 96 has a slider member 96a that fits into a groove 97a of the advancing / retracting member 97 described later at the end of the advancing / retreating member 97. The advancing / retracting member 97 has a groove 97a into which the slider member 96a of the rotating member 96 can be fitted on the left end side (see a partially enlarged view of FIG. 6). The slider member 96a is regulated in the front-rear direction by the groove 97a and is movable in the left-right direction. Therefore, the advance / retreat member 97 moves back and forth as the rotation member 96 rotates. The advancing / retracting member 97 has the cutter 51 fixed to the lower part via the cutter holder 52. The advance / retreat member 97 has a groove 97b on the side facing the cutter guide member 98. The groove portion 97b is slidably fitted to the rail portion 98a of the cutter guide member 98. Therefore, the advance / retreat member 97 and the cutter 51 can be driven forward / backward along the front / rear direction (in other words, the long axis direction of the hole seam 60) with respect to the cutter guide member 98.

  The cutter advance / retreat drive mechanism 90 is configured such that the output shaft 91a of the cutter advance / retreat stepping motor 91 rotates, whereby the first rotation shaft 93, the second rotation shaft 94, the first cutter attachment shaft 53, the rotation member 96, The cutter 51 is driven to advance and retract through the advance / retreat member 97 and the cutter holder 52.

  FIG. 7A and FIG. 7B are diagrams illustrating the vertical movement operation of the cutter 51 by the cutter vertical movement drive mechanism 80. FIG. 7A shows the same state as FIG. 5 described above. As shown in FIG. 7A, when the plunger 81a of the solenoid 81 for driving the cutter retracts backward (see arrow X1), the cutter operating arm 85 rotates around the support shaft 85a (see arrow X2). Based on this rotation, the first shaft holding member 83 and the cylindrical member 82 rise (see arrow X3). Therefore, the cutter 51 rises together with the cutter guide member 98 and the like (see arrow X4). As shown in FIG. 7B, when the plunger 81a of the solenoid 81 for driving the cutter protrudes forward (see arrow X5), the cutter operating arm 85 rotates around the support shaft 85a (see arrow X6). Based on this rotation, the first shaft holding member 83 and the cylindrical member 82 are lowered (see arrow X7). Therefore, the cutter 51 is lowered together with the cutter guide member 98 and the like (see arrow X8), and the work cloth on the feed base 11 is cut.

  FIG. 8A and FIG. 8B are diagrams illustrating the advance / retreat operation of the cutter 51 by the cutter advance / retreat drive mechanism 90. FIG. 8A shows the same state as FIG. 5 described above. As shown in FIG. 8A, when the first rotation shaft 93 connected to the output shaft 91a of the cutter advance / retreat stepping motor 91 rotates rearward (see arrow Y1), the second rotation is performed via the slider 93a. The moving shaft 94 also rotates rearward (see arrow Y2). Along with this rotation, the first cutter attachment shaft 53 connected to the right end side, which is the rotation center of the second rotation shaft 94, rotates in the clockwise direction when viewed from above (see arrow Y3). Based on the rotation of the first cutter mounting shaft 53, the rotating member 96 connected to the lower end portion of the first cutter mounting shaft 53 rotates in a clockwise direction when viewed from above (not shown). The slider member 96a of the rotating member 96 and the groove 97a of the advance / retreat member 97 convert the rotation operation into an advance / retreat operation of the advance / retreat member 97 in the front-rear direction. As a result, the cutter 51 moves forward (see arrow Y4).

  As shown in FIG. 8B, when the first rotation shaft 93 connected to the output shaft 91a of the cutter advance / retreat stepping motor 91 rotates forward (see arrow Y5), the second rotation is performed via the slider 93a. The shaft 94 also rotates forward (see arrow Y6). The rotation of the second rotation shaft 94 causes the first cutter mounting shaft 53 to rotate counterclockwise when viewed from above (see arrow Y7). Based on the rotation of the first cutter mounting shaft 53, the rotating member 96 connected to the lower end portion of the first cutter mounting shaft 53 rotates counterclockwise when viewed from above (see arrow Y8). The slider member 96a of the rotating member 96 and the groove 97a of the advance / retreat member 97 convert the rotation operation into an advance / retreat operation of the advance / retreat member 97 in the front-rear direction. As a result, the cutter 51 retracts backward (see arrow Y9).

  Although not shown, if the plunger 81a of the cutter driving solenoid 81 projects forward in this state, the cutter 51 descends at a position retracted rearward as shown in FIG. 8B.

  Next, a control system of the boring machine M will be described. As shown in FIG. 9, the control device 5 includes a microcomputer mainly composed of a CPU 5a, ROM 5b, RAM 5c, and nonvolatile memory 5g, an input interface 5d, and an output interface 5e, which are connected via a bus 5f. ing. The input interface 5d is connected to the pedal position detection sensor 3a, the operation panel 4, and various origin sensors 101 to 104. The pedal position detection sensor 3 a outputs a signal corresponding to the operation state of the foot pedal 3. The output interface 5 e is connected to the sewing machine motor 2, the stepping motors 13, 22, 36, 91, the drive circuits 70 to 76 for driving the solenoid actuators 45, 81, and the operation panel 4.

  The various origin sensors 101 to 104 are a feed origin sensor 101, a presser foot origin sensor 102, a needle bar left / right swing origin sensor 103, and a cutter advance / retreat origin sensor 104. The feed origin sensor 101 detects the origin of the feed stepping motor 13. The presser foot origin sensor 102 detects the origin of the presser foot stepping motor 22. The needle bar left / right swing origin sensor 103 detects the origin of the needle bar left / right swing stepping motor 36. The cutter advance / retreat origin sensor 104 detects the origin of the cutter advance / retreat stepping motor 91. As these origin sensors, for example, known sensors such as a rotary encoder or an optical sensor provided in each stepping motor are used. The nonvolatile memory 5g stores the origin positions detected by these origin sensors 101 to 104 in a nonvolatile manner.

  In the ROM 5b of the control device 5, a setting process for setting a plurality of parameters for defining the shape and size of the hole stitch 60, the cutter drop pattern for forming the button hole 65, and the like using the operation panel 4 Program, calculation processing program that calculates sewing data (needle drop data) and button hole data (cutter drop position (timing) data) based on multiple parameters, and drilling based on the calculated button hole data An arithmetic processing program for calculating the operation position of the cutter 51 provided so as to be able to advance and retract along the major axis direction of the seam 60, and the cloth feed mechanism 10, the sewing mechanism 30, and the button hole forming mechanism 50 based on the calculated data. A control program for controlling the drive of these is stored.

  FIG. 10 is a plan view of a boring stitch 60 formed by the boring machine M. FIG. In FIG. 10, the round portion represents the drop position of each pitch of the sewing needle 32, and the straight portion represents the stitch by the upper thread 33. As shown in FIG. 10, the hole seam 60 includes a forward zigzag portion 61, a return zigzag portion 62, a front tack stop portion 63, and a back tack stop portion 64. In the figure, reference numeral 66 denotes a sewing start position, and reference numeral 67 denotes a sewing end position. Starting from the sewing start position 66, a part of the front tacking part 63, the forward zigzag part 61, the back tacking part 64, Sewing is performed in the order of the staggered portion 62 and the remaining portion of the front tack stop portion 63, and sewing is completed at a sewing end position 67. Thereafter, the cutter 51 forms a button hole 65 on the inner side of the hole seam 60. The control device 5 includes the cloth feed mechanism 10, the sewing device so that the cutter 51 is lowered and the button hole 65 is formed when the sewing mechanism 30 is sewing the front tacking stop portion 63 after the return zigzag portion 62 is sewn. The mechanism 30 and the button hole forming mechanism 50 are controlled. In addition, the broken line after the sewing end position 67 shown in the drawing indicates the path of the sewing needle 32 when the work cloth is fed after the end of sewing.

  FIG. 11 is a diagram for explaining parameter items that are set when the hole stitch 60 is formed. The simplified hole stitching 60 shown in FIG. 11 corresponds to FIG. 10 described above. Moreover, the black line 68 in the figure represents the cutting position by the cutter 51, and in this example, the case where the button hole 65 is formed by performing three times of cutting is illustrated as an example. In FIG. 11, the black line 68 is drawn at a position shifted in the X direction. However, this is shifted for explanation, and the actual cutting position does not shift in the X direction. .

  As shown in FIG. 11, in the present embodiment, the plurality of parameters are the staggered stitch length A (mm) which is the length in the major axis direction (vertical direction in FIG. 11) of the forward zigzag portion 61 and the return zigzag portion 62. , The cutter dimension S (mm) which is the longitudinal dimension of the cutter 51, the front tacking length D1 (mm) which is the longitudinal direction length of the front tacking part 63, and the longitudinal direction length of the back tacking part 64 Is the gap between the front tacking stop 63 and the back tacking length 63, the front side position of the cutter 51 (the front side position of the frontmost cutting position 68 in the case of multiple cuttings) Cutter space YE (mm), and the back cutter space YS (mm) that is the gap between the cutting back side position of the cutter 51 (including both cutting once and multiple times) and the back stopper 64 are included. Based on the setting processing program, the operation panel 4 is used. It is possible to set.

  Note that, as described above, FIG. 11 shows an example in which the cutter 51 is cut three times, but the number of times of cutting is the cutter size S and the button hole length HOL (HOL = A−YS). -YE) is determined by the control device 5 (details will be described later).

  Based on the setting of the parameter, the control device 5 generates a plurality of sewing data (X, Y) in which coordinate values of a large number of needle drop positions that define the sewing pattern are digitized and arranged in the sewing order, and sequentially read the data. Based on the plurality of sewing data (X, Y), the cloth feed mechanism 10 and the sewing mechanism 30 are controlled so as to form the corresponding hole stitches 60. Each coordinate system of the sewing data (X, Y) takes the X coordinate in the short axis direction of the stitching seam 60 and the Y coordinate in the major axis direction of the stitching seam 60 as shown in FIG. The origin of the Y coordinate corresponds to the front side position of the front tacking portion 63. Then, a cutter ON flag as a lowering identifier for lowering the cutter 51 is set for at least one sewing data in the sewing of the front tacking portion 63 after the return zigzag portion 62 is sewn. The control device 5 instructs the button hole forming mechanism 50 to lower the cutter 51 based on the cutter ON flag at a sewing timing at an appropriate needle drop position of the front tacking stop portion 63.

  Next, the control contents performed when the control device 5 sets the cutter ON flag will be described with reference to FIGS. In the following, the upper limit of the number of times of cutting by the cutter 51 is three times, the necessary overlap amount between adjacent cutting positions when performing a plurality of times of cutting is 1.0 mm or more, and the sewing needle 32 and the cutter 51 The description will be made assuming that the interval L (see FIG. 2 described above) is 2.2 mm. These are merely examples, and may be changed as appropriate according to device specifications and the like.

  In FIG. 12, first, in step S <b> 1, it is determined whether or not to execute “rear cutter”. Here, the “rear cutter” means that the work cloth is fed and cut by the cutter 51 after the sewing at the sewing end position 67 is finished. For example, when this “rear cutter” is not performed, the cutter 51 performs cutting at a cutting position 68 such that the length obtained by adding the front cutter space YE and the front tacking length D1 is smaller than 2.2 mm. However, since it is impossible in terms of the device configuration, it is possible to perform cutting with the cutter 51 at an arbitrary position because the work cloth is fed and cut in the “rear cutter”. However, it is possible to perform cutting at a desired cutting position 68. However, when the “rear cutter” is executed, the work cloth is fed and cut after completion of the sewing of the boring stitch 60, so that the cycle time becomes longer than when cutting is completed during sewing. Has disadvantages. Whether or not to execute this “rear cutter” can be set using the operation panel 4. When “post cutter” is executed (YES in step S1), the process proceeds to the next step S5. On the other hand, when the “rear cutter” is not executed (NO in step S1), the process proceeds to step S15 described later.

  In step S5, it is determined whether or not the length obtained by adding the front cutter space YE and the front tacking length D1 is smaller than 2.2 mm. If YE + D1 <2.2 (YES in step S5), the process proceeds to step S10, and the front cutter space YE is changed to a length obtained by subtracting the front tacking length D1 from 2.2 mm. Thus, the length obtained by adding the front cutter space YE and the front tacking length D1 is changed to 2.2 mm. On the other hand, if YE + D1 ≧ 2.2 (NO in step S5), the process proceeds to the next step S15.

  In step S15, the button hole length HOL is calculated by subtracting the back cutter space YS and the front cutter space YE from the staggered stitch length A.

  In step S20, it is determined whether or not the calculated buttonhole length HOL is less than or equal to the cutter dimension S. If HOL ≦ S (YES in step S20), the process proceeds to step S25, and the number of times of cutting by the cutter 51 is set to one. Further, ymm [3] (see FIG. 11) which is the Y coordinate of the front side position of the cutting position 68 corresponding to the first cutting is set to a length obtained by adding the front tacking length D1 and the front cutter space YE. To do. Thereafter, the process proceeds to step S50 described later. On the other hand, if HOL> S (NO in step S20), the process proceeds to the next step S30.

  In step S30, it is determined whether or not the calculated buttonhole length HOL is equal to or less than the length obtained by subtracting the overlap amount 1 (mm) from twice the cutter dimension S. If HOL ≦ 2S−1 (YES in step S30), the process proceeds to step S35, and the number of times of cutting by the cutter 51 is set to two. Further, the length obtained by adding ymm [1] (see FIG. 11), which is the Y coordinate of the front side position of the cutting position 68 corresponding to the first cutting, to the front tacking length D1 and the zigzag stitching length A Ymm [3] (see FIG. 11), which is set to a length obtained by subtracting the back cutter space YS and the cutter dimension S from the Y coordinate of the front side position of the cutting position 68 corresponding to the second cutting, Similarly to step S25, the length is set to a length obtained by adding the front tacking length D1 and the front cutter space YE. Thereafter, the process proceeds to step S50 described later. On the other hand, if HOL> 2S-1 (NO in step S30), the process proceeds to the next step S40.

  In step S40, it is determined whether or not the calculated button hole length HOL is equal to or less than a length obtained by subtracting 2 (mm), which is three times the overlap size, from twice the cutter dimension S. When HOL ≦ 3S−2 (YES in step S40), the process proceeds to step S45, and the number of times of cutting by the cutter 51 is set to three. Further, ymm [1] (see FIG. 11) which is the Y coordinate of the front side position of the cutting position 68 corresponding to the first cutting is set to the front tacking length D1 and the staggered stitching length in the same manner as in step S35. Ymm [3] which is set to a length obtained by subtracting the back cutter space YS and the cutter dimension S from the length obtained by adding A and the Y coordinate of the front side position of the cutting position 68 corresponding to the third cutting. (Refer to FIG. 11) is set to a length obtained by adding the front tacking length D1 and the front cutter space YE in the same manner as in steps S25 and S35. Further, ymm [2] (see FIG. 11), which is the Y coordinate of the front side position of the cutting position 68 corresponding to the second cutting, is set to the midpoint position of ymm [1] and ymm [3]. Thereafter, the process proceeds to the next step S50. On the other hand, if HOL> 3S-2 (NO in step S40), the process moves to the cutter step S47 where the number of cuts is 4 or more, and executes the cut number error process (for example, error display or buzzer on the operation panel 4). To do. Thereafter, this flow ends (see FIG. 13). In this case, for example, it is necessary to reduce the button hole length HOL and perform resetting, or to replace the cutter 51 and increase the cutter dimension S.

  In step S50, the sewing data (X, Y) after the front tacking portion 63 is read, and the value of the Y coordinate is the distance L between the sewing needle 32 and the cutter 51 from the ymm [1] (see FIG. 2 described above). Sewing data that is equal to or less than the length obtained by subtracting 2.2 (mm) is retrieved, the sewing data is set to P1, and the Y coordinate is set to Y [1].

  In step S55, it is determined whether or not the “rear cutter” is executed in the same manner as in step S1 described above. When the “rear cutter” is executed (YES in step S55), the process proceeds to the next step S60. In this step S60, the sewing data next to the sewing data corresponding to the sewing end position 67 (sewing data corresponding to the dropping position of the sewing needle 32 after the sewing is finished and the work cloth is fed) is set to P3, and Y The coordinate is Y [3]. The sewing data corresponding to 5 stitches before the sewing data P3 is P2, and the Y coordinate is Y [2]. Note that the above five needles are examples, and the number of needles may be changed as appropriate according to the device specifications and the like.

  If the “rear cutter” is not executed in step S55 (NO in step S55), the process proceeds to step S65, where the sewing data corresponding to the sewing end position 67 is P3, and the Y coordinate is Y [3]. The sewing data corresponding to 5 stitches before the sewing data P3 is P2, and the Y coordinate is Y [2].

  Turning to FIG. 13, in step S <b> 70, it is determined whether the number of cuttings is set to 1 to 3 in the above steps S <b> 25, S <b> 35, and S <b> 45. If it is once (once in step S70), the process proceeds to step S75, and the cutter ON flag is set in the sewing data P3. Further, the cutter coordinate cmm [1], which is the movement position of the cutter 51, is set to a value obtained by subtracting Y [3], which is the Y coordinate of the sewing data P3, and 2.2 (mm) from the ymm [3]. The cutter coordinates are coordinates representing the relative position of the cutter 51 with respect to the sewing needle 32, and the cutter 51 is closest to the sewing needle 32 (that is, the interval L between the sewing needle 32 and the cutter 51 is 2.2 mm). This is a uniaxial coordinate system along the major axis direction of the hole stitching seam 60 with 0 being zero. Then, this flow ends.

  In step S70, when the number of times of cutting is two (twice in step S70), the process proceeds to step S80, and the cutter ON flag is set in the sewing data P1. Further, the cutter coordinate cmm [1] which is the movement position corresponding to the first cutting of the cutter 51 is set, and Y [1] and 2.2 (mm) which are the Y coordinate of the sewing data P1 from the ymm [1]. Set to the reduced value. Thereafter, the process proceeds to step S85, and the cutter ON flag is set in the sewing data P3. Also, the cutter coordinate cmm [2] corresponding to the movement position corresponding to the second cutting of the cutter 51 is set, and Y [3] and 2.2 (mm) which are the Y coordinate of the sewing data P3 from the ymm [3]. Set to the reduced value. Then, this flow ends.

  In step S70, when the number of times of cutting is three (three in step S70), the process proceeds to step S90, and the cutter ON flag is set in the sewing data P1. Further, the cutter coordinate cmm [1] which is the movement position corresponding to the first cutting of the cutter 51 is set, and Y [1] and 2.2 (mm) which are the Y coordinate of the sewing data P1 from the ymm [1]. Set to the reduced value. Thereafter, the process proceeds to step S93, and the cutter ON flag is set in the sewing data P2. Further, the cutter coordinate cmm [2] which is the movement position corresponding to the second cutting of the cutter 51 is set, and Y [2] and 2.2 (mm) which are the Y coordinate of the sewing data P2 from the ymm [2]. Set to the reduced value. Thereafter, the process proceeds to step S95, and the cutter ON flag is set in the sewing data P3. Further, the cutter coordinate cmm [3] which is the movement position corresponding to the third cutting of the cutter 51 is set, and Y [3] and 2.2 (mm) which are the Y coordinate of the sewing data P3 from the above ymm [3]. Set to the reduced value. Then, this flow ends.

  In the above, Step S75, Step S80, Step S85, Step S90, Step S93, and Step S95 constitute an identifier setting means for setting the descending identifier described in the claims, and also constitute a movement position setting means. To do.

  FIG. 14 is a diagram showing a specific example of the sewing data P1, P2, P3 and cutter coordinates set as described above. In this example, the staggered stitch length A is 31 (mm), the cutter dimension S is 13 (mm), the front tacking length D1 is 2 (mm), and the back tacking length D2 is 2 (mm). ), The front cutter space YE is set to 0.5 (mm), and the back cutter space YS is set to 0.5 (mm). As a result, the number of times of cutting is three, Y [1], Y [2], Y [3] which are the Y coordinates of the sewing data P1, P2, P3, and the Y coordinates of the front side position of the corresponding cutting position 68 Ymm [1], ymm [2], ymm [3] and cutter coordinates cmm [1], cmm [2], cmm [3] are values shown in the figure. In this example, the “rear cutter” described above is executed, and the third cutting corresponding to the sewing data P3 is performed by feeding the work cloth after the sewing is completed.

  Next, the control contents executed by the control device 5 when the hole stitches 60 are formed based on the plurality of sewing data and the cutter ON flag set as described above will be described with reference to FIGS. 15 and 16. .

  In FIG. 15, in step S <b> 105, a control signal is output to the drive circuit 71 to drive the feeding stepping motor 13, and a control signal is output to the drive circuit 73 to drive the stepping motor 36. The boring machine M feeds the work cloth and swings the needle bar 31 to move the sewing needle 32 to a position corresponding to the sewing start position 66 of the work cloth. In this case, the feed speed of the work cloth is determined based on the rotational speed of the sewing machine motor 2 and the feed pitch.

  In step S110, a control signal is output to the drive circuit 76 to drive the cutter advancing / retreating stepping motor 91, and the cutter 51 is advanced and retracted along the long axis direction of the boring stitch 60, thereby the cutter coordinate cmm [1] described above. Move to.

  In step S115, a start signal is output to the drive circuit 70, and the sewing machine motor 2 is started.

  In step S120, the sewing data corresponding to the first address among the plurality of sewing data respectively stored at the corresponding data addresses is read. At the time of reading this data, the data address is advanced to facilitate the next reading.

  In step S125, it is determined whether a cutter ON flag is set in the read sewing data. If the cutter ON flag is set (YES in step S125), a lowering command signal is output to the drive circuit 75 in the next step S130. Thereby, the plunger 81a of the solenoid 81 for driving the cutter protrudes forward, and the cutter 51 descends to cut the work cloth on the feed base 11. At this time, a flowchart shown in FIG. 16 to be described later is started in parallel with the lowering operation of the cutter 51 as a trigger (details will be described later). On the other hand, when the cutter ON flag is not set in the sewing data read in step S125 (NO in step S125), the process proceeds to the next step S135.

  In step S135, it is determined whether or not the read sewing data is sewing machine stop data corresponding to the sewing machine stop. If it is sewing stop data (YES in step S135), a stop signal is output to the drive circuit 70 in the next step S140, and the sewing machine motor 2 is stopped. Thereafter, the process returns to step S120. On the other hand, when it is not the sewing machine stop data (NO in step S135), the process proceeds to the next step S145.

  In step S145, it is determined whether or not the read sewing data is end data. If it is end data (YES in step S145), this flow ends. On the other hand, if it is not end data (NO in step S145), the process proceeds to the next step S150.

  In step S150, it is determined whether or not the read sewing data is stitch data (X, Y) representing the coordinate value of the needle drop position. If it is not stitch data (NO in step S150), the process proceeds to step S160 described later. On the other hand, if the read sewing data is stitch data (YES in step S150), it is determined in step S155 whether or not a predetermined cloth feed timing has come. This determination is repeated until the predetermined cloth feed timing is reached (NO in step S155). If the predetermined cloth feed timing is reached (YES in step S155), the process proceeds to the next step S160.

  In step S160, a control signal is output to the drive circuit 71 to drive the feeding stepping motor 13, and a control signal is output to the drive circuit 73 to drive the stepping motor 36 to feed the work cloth by one pitch distribution. The needle bar 31 is swung by one pitch, and the sewing needle 32 is moved to a position ahead by one pitch. And it returns to previous step S120 and repeats the same procedure.

  FIG. 16 is a flowchart that starts with the lowering operation of the cutter 51 (including any of the first to third times) as a trigger as described above, and operates in parallel with the flowchart shown in FIG. Such concurrent processing can be performed by one CPU by a known method similar to “multitask processing” often performed by, for example, an OS of a computer.

  In step S210, the process waits for a predetermined time. In the next step S220, an ascending command signal is output to the drive circuit 75. As a result, the plunger 81a of the solenoid 81 for driving the cutter retracts backward, and the cutter 51 rises.

  In step S230, the process waits for a predetermined time. In the next step S240, it is determined whether or not the cutter 51 has finished cutting a predetermined number of times (the number of cuttings set in steps S25, S35, and S45 described above). If not completed (NO in step S240), the process proceeds to step S250, and among the plurality of cutter coordinates stored in the corresponding data address, the cutter coordinate corresponding to the next address is read. At the time of this data reading, the data address is advanced to facilitate the next data reading. Thereafter, in step S260, a control signal is output to the drive circuit 76 to drive the cutter advance / retreat stepping motor 91 to move the cutter 51 to a position corresponding to the read cutter coordinates. Then, this flow ends.

  When the predetermined number of times of cutting by the cutter 51 has been completed in step S240 (YES in step S240), the process proceeds to step S270 to output a control signal to the drive circuit 76 to drive the cutter advance / retreat stepping motor 91, The cutter 51 is moved to the origin position. Then, this flow ends.

  Depending on the above control content, the boring machine M operates as follows. When sewing is started, the sewing needle 32 is moved to the sewing start position 66 of the work cloth (step S105), and the cutter 51 is moved forward and backward to move to the corresponding cutter coordinate position (step S110). The motor 2 is started (step S115). Thus, based on the plurality of read sewing data, sewing is performed in the order of a part of the front tacking part 63, the forward stagger part 61, the back tacking part 64, the reverse staggered part 62, and the remaining part of the front tacking part 63. Then, the corresponding hole seam 60 is formed. At this time, if the cutter ON flag is set in the read sewing data when the front tacking portion 63 is sewn after the return zigzag portion 62 is sewn (YES in step S125), the cutter 51 is lowered and the feed base is set. 11 is cut (step S130). At this time, the process shown in FIG. 16 is started in parallel with the process of FIG. If the number of times of cutting is one, cutting has been completed (YES in step S240), and the cutter 51 is moved to the origin position (step S270). On the other hand, when the number of times of cutting is a plurality of times, cutting has not been completed (NO in step S240), and therefore the cutter 51 is moved to the next cutter coordinate position (step S260). Thereby, the process shown in FIG. 16 is once ended.

  Thereafter, if the next cutter ON flag is set in the read sewing data while continuing the sewing of the front tacking stop portion 63 (YES in step S125), the cutter 51 is lowered and the second cutting is performed. Execute (Step S130). At this time, the processes shown in FIG. 16 are started again in parallel. If the number of times of cutting is two, cutting has been completed (YES in step S240), and the cutter 51 is moved to the origin position (step S270). On the other hand, when the number of times of cutting is 3, since cutting has not been completed (NO in step S240), the cutter 51 is moved to the next cutter coordinate position (step S260). Then, the same operation is repeated to execute the third cutting.

  The boring machine M of the present embodiment described above has the cloth feed mechanism 10 and the sewing mechanism 30, and the cloth feed mechanism 10 feeds the work cloth based on the control of the control device 5. When the sewing mechanism 30 moves the sewing needle 32 up and down, a hole seam 60 whose major axis is the cloth feed direction is formed. Further, the boring machine M of the present embodiment further includes a button hole forming mechanism 50. Based on the control of the control device 5, the button hole forming mechanism 50 lowers the cutter 51 once or a plurality of times to cut the work cloth, thereby forming the button hole 65.

  At this time, in the boring machine M of the present embodiment, the cutter 51 is installed so as to be able to advance and retreat with respect to the machine frame of the sewing machine M, and along the long axis direction of the boring seam 60 formed as described above. It is possible to advance and retreat. Thereby, the cutting position of the work cloth by the cutter 51 in the long axis direction of the hole stitching line 60 can be freely set without depending only on the cloth feeding operation by the cloth feeding mechanism 10.

  As a result, the cutting position of the work cloth is finely adjusted and set, and details will be described later, but the setting can be further corrected in accordance with the sewing speed and sewing conditions. Further, when sewing the hole seam 60 composed of a pair of tacking parts 63, 64 and a pair of staggered parts 61, 62, the tacking part 63 has a lower cloth feed speed than when the staggered parts 61, 62 are sewn. , 64 (in this embodiment, the front tack stop portion 63) can be controlled to lower the cutter 51 and cut the work cloth when sewing. Thus, the cutter 51 can be accurately lowered to a desired position on the work cloth intended by the operator, and the button hole 65 can be formed reliably.

  In this embodiment, in particular, the button hole forming mechanism 50 includes not only the cutter vertical movement drive mechanism 80 for moving the cutter 51 up and down by the cutter drive solenoid 81 but also the cutter advance / retreat drive mechanism 90. Thereby, the cutter 51 can be advanced and retracted along the major axis direction of the boring stitch 60 using the driving force of the cutter advance / retreat stepping motor 91.

  In this embodiment, in particular, the first cutter mounting shaft 53 for mounting the cutter 51 is held by the first shaft holding member 83 via the tubular member 82, and the cutter is moved up and down relative to the first shaft holding member 83. The first vertical movement link mechanism 84 of the mechanism 80 transmits the driving force of the cutter driving solenoid 81 to move the first shaft holding member 83 up and down. Thereby, the cutter 51 can be lowered with respect to the work cloth. The first shaft holding member 83 holds the first cutter mounting shaft 53 rotatably via the cylindrical member 82, and the rotation link mechanism 92 of the cutter advance / retreat drive mechanism 90 generates the driving force of the cutter advance / retreat stepping motor 91. This is transmitted to the first cutter mounting shaft 53 and rotated. The conversion mechanism 95 of the cutter advance / retreat drive mechanism 90 converts the rotation operation of the first cutter attachment shaft 53 into the advance / retreat operation, whereby the cutter 51 can be advanced / retreated along the long axis direction of the hole stitch 60. .

  In the present embodiment, in particular, the sewing mechanism 30 performs sewing according to the cloth feed of the work cloth by the cloth feed mechanism 10. The sewing mechanism 30 forms a part of the front tack stop portion 63 on the work cloth, and then further forms the forward zigzag portion 61, the back tack stop portion 64, and the reverse zigzag portion 62, and finally the front tack stop portion. The remaining portion of 63 is formed to complete the drilled seam 60. The pitch of the cloth feed is larger in the staggered portions 61 and 62 than in the tacking portions 63 and 64. Therefore, the cloth feed speed of the work cloth is larger in the staggered portions 61 and 62 than in the tacking portions 63 and 64.

  When the cutter 51 is lowered when the zigzag portions 61 and 62 having a high cloth feed speed are sewn, the work cloth moves greatly by the cloth feed during a short time until the cutter 51 descends from the standby position and cuts the work cloth. In addition, the accuracy of the position where the button hole 65 is formed may be reduced. In addition, when the cutter 51 is lowered, the work cloth is pulled by the cutter 51, which may adversely affect the sewing of the staggered portions 61 and 62. Furthermore, when the boring machine M is decelerated in order to prevent the pulling, the cycle time increases. In this embodiment, by lowering the cutter 51 at the time of sewing the front tacking portion 63 after sewing the reverse zigzag portion 62 with a particularly low cloth feed speed, the above-described adverse effects are surely avoided, and the cycle time is highly accurate. The button hole 65 can be formed at a desired position without increasing. Further, by cutting with the cutter 51 when sewing the front tacking portion 63 after sewing the reverse staggered portion 62, after the sewing of the staggered portions 61 and 62 located on both sides of the cutting position is completed, processing on both sides of the cutting position is performed. Since cutting can be performed in a state in which the cloth has increased rigidity, there is also an effect that it is possible to suppress an adverse effect caused by pulling of the work cloth at the time of cutting.

  In the present embodiment, in particular, the control device 5 controls the sewing mechanism 30 while reading the sewing data one after another, and executes the sewing. The sewing mechanism 30 lowers the sewing needle 32 at the needle drop position described in each sewing data, and performs sewing on the work cloth. At this time, the sewing data is used to control the lowering of the cutter 51, and a cutter ON flag as a lowering identifier is set in the sewing data at the time of sewing the front tacking stop portion 63 after the return zigzag portion 62 is sewn. Accordingly, the control device 5 can instruct the button hole forming mechanism 50 to lower the cutter 51 based on the cutter ON flag at the sewing timing of an appropriate needle drop position of the front tacking stop portion 63.

  In the present embodiment, in particular, when the cutter ON flag is set in the sewing data, an instruction signal is output to the vertical movement drive mechanism 80 of the button hole forming mechanism 50 at the sewing timing of the corresponding needle drop position, and the cutter 51 Instruct to descend. Thereby, the cutter 51 can be lowered in conjunction with the timing of moving the sewing needle 32 up and down during sewing, and the work cloth can be cut. By performing the cutting by the cutter 51 during the sewing operation in this manner, the entire processing time can be shortened compared to the case of performing the cutting by the cutter 51 after the sewing is completely completed.

  In the present embodiment, in particular, in order to lower the cutter 51 in conjunction with the sewing execution timing at an appropriate needle drop position as described above, the needle drop position coordinate value of the sewing data with the cutter ON flag set is set. Correspondingly, the cutter coordinates which are the movement positions of the cutter 51 are set. The control device 5 controls the cutter advance / retreat driving mechanism 90 to move the cutter 51 to a position corresponding to the set cutter coordinates. Thereby, before the sewing execution timing of the needle drop position corresponding to the lowering of the cutter 51 actually arrives, the cutter 51 can be moved in advance to the movement position corresponding to the sewing execution timing. As a result, compared with the case where the cutter 51 is moved to the corresponding position and then lowered after the sewing execution timing at the needle drop position has arrived, only the lowering needs to be performed at that timing, so the movement position corresponding to the sewing execution timing is accurate. The cutter 51 can be lowered well. Therefore, it is possible to form the button hole 65 more reliably and with high accuracy.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described in order.

(1) Modified Example of Button Hole Forming Mechanism FIG. 17 is a perspective view of the entire structure of the button hole forming mechanism 150 of this modified example as seen from the diagonally upper right direction, and FIG. 18 is a perspective view as seen from the diagonally upper left direction. . As shown in FIGS. 17 and 18, the button hole forming mechanism 150 includes a cutter vertical movement drive mechanism 180 and a cutter advance / retreat drive mechanism 190. The cutter vertical movement drive mechanism 180 includes a cutter drive solenoid 181 (corresponding to a first actuator) for moving the cutter 51 up and down. The cutter advance / retreat drive mechanism 190 includes a cutter advance / retreat stepping motor 191 (equivalent to a second actuator) for advancing and retracting the cutter 51.

  The cutter vertical movement drive mechanism 180 includes a second vertical movement link mechanism 184 and a second cutter mounting plate 153 (corresponding to a second mounting member). The second vertical movement link mechanism 184 operably connects a second cutter mounting plate 153 (corresponding to a second mounting member), which will be described later, so that the second cutter mounting plate 153 moves up and down, and the second cutter mounting plate 153 is moved up and down by the driving force of the cutter driving solenoid 181. Move. The second cutter mounting plate 153 has an opening 153a at the center in the longitudinal direction. The second cutter mounting plate 153 has a cutter holder 52 fixed to the lower end thereof. The cutter holder 52 has a cutter 51 detachably fixed to a lower portion thereof. The second vertically moving link mechanism 184 includes a substantially L-shaped cutter operating arm 185, a spring member 186 that biases the front portion of the cutter operating arm 185 upward, and a slider 187. The slider 187 is connected to the front end portion of the cutter operating arm 185, and can slide in the opening portion 153a of the second cutter mounting plate 153 in the front-rear direction. In the cutter operating arm 185, the support shaft 185 a supports the central portion in the front-rear direction of the cutter operating arm 185. The cutter operating arm 185 can swing with respect to the sewing machine frame with the support shaft 185a as a fulcrum. The cutter operating arm 185 has an upper end that is pivotably connected to a plunger 181a that protrudes forward from the cutter driving solenoid 181. When the cutter operating arm 185 moves counterclockwise (in FIG. 17), the slider 187 moves the second cutter mounting plate 153 downward. In this case, the slider 187 moves forward (in FIG. 17) in the opening 153a. When the cutter operating arm 185 moves forward (in FIG. 17), the slider 187 moves the second cutter mounting plate 153 upward. In this case, the slider 187 moves backward (in FIG. 17) in the opening 153a.

  The above-described cutter vertical movement drive mechanism 180 is configured such that the plunger 181a of the cutter drive solenoid 181 protrudes / withdraws, thereby the cutter 51 via the cutter operating arm 185, the slider 187, the second cutter mounting plate 153, and the cutter holder 52. Move up and down.

  The cutter advancing / retracting drive mechanism 190 includes a second shaft holding member 192 (corresponding to a second holding member) that holds the second cutter mounting plate 153 so as to be movable up and down, and an advancing / retreating link mechanism 193. The advance / retreat link mechanism 193 moves the second shaft holding member 192 forward / backward by the driving force of the cutter advance / retreat stepping motor 191. The advance / retreat link mechanism 193 includes a first crank plate 194 and a second crank plate 195. The first crank plate 194 is connected to an output shaft 191a (not shown) protruding rightward from the stepping motor 191 for advancing and retracting the cutter, and rotates around the output shaft 191a. The second crank plate 195 has a rear end side connected to the first crank plate 194 so as to be rotatable. The front end side of the second crank plate 195 is rotatably connected to the second shaft holding member 192. The second shaft holding member 192 includes a slide support member 196 fixed to the sewing machine frame, a slide shaft 197, a bearing 198, and an engagement member 199. The slide support member 196 supports two upper and lower slide shafts 197. Each slide shaft 197 supports a bearing 198 so as to be slidable. Each bearing 198 includes an engaging member 199 that engages with the second cutter mounting plate 153, is slidable up and down, and restricts forward and backward movement.

  In the cutter advance / retreat drive mechanism 190 described above, the output shaft 191a of the cutter advance / retreat stepping motor 191 rotates, whereby the first and second crank plates 194, 195, the second shaft holding member 192, and the second cutter attachment plate 153. The cutter 51 can be driven back and forth via the cutter holder 52.

  FIG. 19A and FIG. 19B are diagrams illustrating the vertical movement operation of the cutter 51 by the cutter vertical movement drive mechanism 180. FIG. 19A shows the same state as FIG. 17 described above. As shown in FIG. 19A, when the plunger 181a of the cutter driving solenoid 181 is retracted backward (see arrow X1), the cutter operating arm 185 rotates around the support shaft 185a (see arrow X2). The cutter operating arm 185 raises the slider 187. Therefore, the second cutter mounting plate 153 rises together with the slider 187 while sliding the slider 187 forward in the opening 153a (see arrow X3). As a result, the cutter 51 rises together with the cutter holder 52 (see arrow X4). As shown in FIG. 19B, when the plunger 181a of the cutter driving solenoid 181 protrudes forward (see arrow X5), the cutter operating arm 185 rotates around the support shaft 185a (see arrow X6). As a result, the slider 187 descends. Therefore, the second cutter mounting plate 153 descends together with the slider 187 while sliding the slider 187 rearward in the opening 153a (see arrow X7). As a result, the cutter 51 moves down together with the cutter holder 52 (see arrow X8). Thereby, the work cloth on the feed base 11 can be cut.

  FIG. 20A and FIG. 20B are diagrams illustrating an advance / retreat operation of the cutter 51 by the cutter advance / retreat driving mechanism 190. FIG. 20A shows the same state as FIG. 18 described above. As shown in FIG. 20 (a), when the first crank plate 194 connected to the output shaft 91a of the cutter advance / retreat stepping motor 191 rotates forward (see arrow Y1), the first crank plate 194 and the second crank plate are moved. The plate 195 converts the rotation operation into the forward / backward movement in the front / rear direction (see arrow Y2). As a result, the second shaft holding member 192 slides forward together with the second cutter mounting plate 153 (see arrow Y3). As a result, the cutter 51 connected to the lower end of the second cutter mounting plate 153 via the cutter holder 52 moves forward (see arrow Y4).

  As shown in FIG. 20B, when the first crank plate 194 connected to the output shaft 91a of the stepping motor 191 for advancing / retreating the cutter rotates rearward (see arrow Y5), the first crank plate 194 and the second crank The plate 195 converts the turning operation into a forward / backward movement operation (see arrow Y6). As a result, the second shaft holding member 192 slides rearward together with the second cutter mounting plate 153 (see arrow Y7). As a result, the cutter 51 connected to the lower end portion of the second cutter mounting plate 153 via the cutter holder 52 moves backward (see arrow Y8).

  The configuration other than the above of the hole sewing machine M of the present modification and the control content of the control device 5 are the same as those in the above-described embodiment, and thus the description thereof is omitted.

  In the modification described above, the second vertical movement link mechanism 184 of the cutter vertical movement drive mechanism 180 is operatively connected to the second cutter mounting plate 153 for mounting the cutter 51, and the cutter driving solenoid 181 is driven. The force is transmitted to move the second cutter mounting plate 153 up and down. Thereby, the cutter 51 can be lowered with respect to the work cloth. Further, the second shaft holding member 192 holds the second cutter mounting plate 153 so that the second cutter mounting plate 153 can move up and down, and the advancing / retreating link mechanism 193 of the cutter advancing / retreating drive mechanism 190 with respect to the second shaft holding member 192 is a stepping motor for advancing / retreating the cutter. The driving force of 191 is transmitted, and the second shaft holding member 192 is advanced and retracted. Thereby, the cutter 52 can be advanced and retracted along the long axis direction of the hole stitching 60.

(2) When correcting the cutter coordinate position When the cloth feed speed is high due to the large rotational speed and pitch of the sewing machine motor 2, the slight amount of time until the cutter 51 descends from the standby position and cuts the work cloth. There is a possibility that the work cloth moves over time, and the position where the button hole 65 is originally formed and the lowering position of the cutter 51 are shifted. Further, depending on the type of work cloth or sewing thread, there is a possibility that a shift similar to the above may occur due to the influence of friction or the like. This modification avoids the effect of the above-mentioned deviation by correcting the cutter coordinate position in response to the above-mentioned machine motor rotational speed, cloth feed speed, work cloth / sewing thread type, etc. in preparation for such a situation. To do.

  FIG. 21 is a diagram for explaining parameter items in the present modification. As shown in FIG. 21, the parameters of the present modified example are the cutter back side for correcting the coordinates of the cutting back side position (the back side position of the cutting position at the farthest side) of the cutter 51 in the case of cutting a plurality of times. Coordinate correction ADJ is included. The operator uses the operation panel 4 according to at least one of the rotational speed of the sewing machine motor 2, the cloth feed speed (feed pitch) of the cloth feed mechanism 10, the type of work cloth, the type of sewing thread, and the like. Thus, the cutter back side coordinate correction ADJ can be set to an appropriate value. Other parameters are the same as those in the above-described embodiment.

  In addition, although the case where the coordinate of the cutting back side position of the cutter 51 was corrected was shown as an example in the above description, for example, the coordinates of the cutting front side position (front side cutting position closest to the cutting position) may be corrected. Alternatively, the coordinates of both the cutting back side position and the cutting near side position may be correctable.

  Next, the contents of control performed when the control device 5 in the present modification sets the cutter ON flag will be described. Only parts different from the control contents shown in FIGS. 12 and 13 will be described with reference to FIG.

  In FIG. 22, step S70 and step S75 are the same as those in FIG. In step S70, when the number of times of cutting is two (twice in step S70), the process proceeds to step S80A, and the cutter ON flag is set in the sewing data P1. Further, the cutter coordinate cmm [1] which is the movement position corresponding to the first cutting of the cutter 51 is set, and Y [1] and 2.2 (mm) which are the Y coordinate of the sewing data P1 from the ymm [1]. The value obtained by adding the cutter back side coordinate correction ADJ to the subtracted value is set. Thereafter, the process proceeds to step S85. Step S85 is the same as that in FIG.

  On the other hand, if the number of cuts is 3 in step S70 (3 times in step S70), the process proceeds to step S90A, and the cutter ON flag is set in the sewing data P1. Further, the cutter coordinate cmm [1] which is the movement position corresponding to the first cutting of the cutter 51 is set, and Y [1] and 2.2 (mm) which are the Y coordinate of the sewing data P1 from the ymm [1]. The value obtained by adding the cutter back side coordinate correction ADJ to the subtracted value is set. Subsequent steps S93 and S95 are the same as those in FIG.

  As described above, since the cutter back side coordinate correction ADJ is a parameter for correcting the coordinates of the cutting back side position of the cutter 51, the cutter back side coordinate is set to the value of the cutter coordinate cmm [1] only for the sewing data P1. Correction ADJ is added.

  In the above, in step S80A and step S90A, the value obtained by subtracting Y [1], which is the Y coordinate of the sewing data P1, and 2.2 (mm) from ymm [1], which is the set value of the cutter coordinate cmm [1]. In addition, the portion to which the cutter back side coordinate correction ADJ is added constitutes a movement position correction means for correcting the movement position described in the claims.

  FIG. 23 is a diagram illustrating a specific example of sewing data P1, P2, P3, cutter coordinates, and the like set in the present modification. In this example, the staggered stitch length A is 31 (mm), the cutter dimension S is 20 (mm), the front tacking length D1 is 1 (mm), and the back tacking length D2 is 1 (mm). ), The front cutter space YE is set to 0.5 (mm), the back cutter space YS is set to 0.5 (mm), and the cutter back side coordinate correction ADJ is set to 0.3 (mm). As a result, the number of times of cutting becomes two, Y [1] and Y [3] which are Y coordinates of the sewing data P1 and P3, ymm [1] which are Y coordinates of the front side position of the corresponding cutting position 68, ymm [3], cutter coordinates cmm [1], and cmm [3] are the values shown in the figure.

  In the modification described above, the cutter back side coordinate correction ADJ for correcting the coordinates of the cutting back side position (the back side position of the cutting position at the farthest side) of the cutter 51 in the case of cutting a plurality of times as a parameter. Therefore, the set movement position of the cutter 51 can be further finely adjusted according to the sewing speed and the sewing conditions. As a result, it is possible to form the button hole 65 more reliably and with high accuracy. In general, when the rotational speed and the cloth feed speed of the sewing machine motor 2 are high, the work cloth moves during a short time until the cutter 51 descends from the standby position and cuts the work cloth, and the button hole 65 is originally formed. There is a possibility that the position where it is desired to be formed and the lowered position of the cutter 51 are shifted. Further, depending on the type of work cloth or sewing thread, there is a possibility that a shift similar to the above may occur due to the influence of friction or the like. On the other hand, according to the present modification, the influence of the deviation is avoided by determining the cutter back side coordinate correction ADJ corresponding to the sewing motor rotation speed, the cloth feed speed, the work cloth / sewing thread type, and the like. be able to. As a result, it is possible to form the button hole 65 more reliably and with high accuracy.

5 Control device (control means)
10 Cloth feed mechanism (cloth feed means)
30 Sewing mechanism (sewing means)
32 Sewing needle 50 Button hole forming mechanism (button hole forming means)
51 Cutter 53 First cutter mounting shaft (first mounting member)
60 Hole stitching 61 Outer staggered part 62 Returned staggered part 63 Front tack stop part 64 Back tack stop part 65 Button hole 80 Cutter vertical movement drive mechanism 81 Cutter drive solenoid (first actuator)
83 First shaft holding member (first holding member)
84 First vertical link mechanism 90 Cutter advance / retreat drive mechanism 91 Stepping motor for cutter advance / retreat (second actuator)
92 Rotary link mechanism 95 Conversion mechanism 153 Second cutter mounting shaft (second mounting member)
180 Cutter vertical motion drive mechanism 181 Cutter drive solenoid (first actuator)
184 Second vertical link mechanism 190 Cutter advance / retreat drive mechanism 192 Second shaft holding member (second holding member)
193 Advancing and retracting link mechanism M

Claims (10)

Cloth feeding means for feeding the work cloth;
Sewing means comprising a sewing needle that moves up and down, and forming a holed seam in the work cloth;
A button hole forming means having a cutter for cutting a work cloth to form a button hole;
Based on the length of the cutter and the length of the button hole, the cloth feeding means, the sewing means, and the button hole formation so as to form the button hole by one or more times of the lowering operation of the cutter In a drilling machine provided with a control means for controlling the means,
The button hole forming means includes
A boring machine characterized in that the cutter is provided so as to be movable back and forth along the long axis direction of the boring seam with respect to the machine frame of the sewing machine. In the drilling machine according to claim 1,
The button hole forming means includes
A cutter vertical movement drive mechanism including a first actuator for moving the cutter up and down;
A boring machine characterized by further comprising a cutter advance / retreat drive mechanism provided with a second actuator for advancing and retracting the cutter. In the drilling machine according to claim 2,
The cutter vertical movement drive mechanism is
A first holding member for rotatably holding a first attachment member for attaching the cutter;
A first vertically moving link mechanism for vertically moving the first holding member by the driving force of the first actuator;
The cutter advance / retreat driving mechanism is:
A rotation link mechanism for rotating the first mounting member by a driving force of the second actuator;
A boring machine characterized by further comprising a conversion mechanism for converting the turning operation of the first mounting member into an advancing / retreating operation along the long axis direction of the boring stitch of the cutter. In the drilling machine according to claim 2,
The cutter vertical movement drive mechanism is
A second vertically moving link mechanism for operatively connecting a second mounting member for mounting the cutter so as to be movable back and forth, and moving the second mounting member up and down by a driving force of the first actuator;
The cutter advance / retreat driving mechanism is:
A second holding member that holds the second mounting member in a vertically movable manner;
A boring machine characterized by further comprising an advancing / retreating link mechanism for moving the second holding member forward / backward by a driving force of the second actuator. In the boring machine according to any one of claims 2 to 4,
The sewing means includes
For the work cloth, a part of the front tacking part, a forward staggered part, a back tacking part, a reverse staggered part, and the hole tacking seam in the order of the front tacking part,
The control means includes
The cloth feeding means, the sewing means, and the sewing means are configured to lower the cutter and form the button hole when the sewing means is performing sewing of the front tack-fastening portion after sewing the staggered portion. A boring machine characterized by controlling the button hole forming means. In the drilling machine according to claim 5,
The control means includes
The coordinate values of a number of needle entry positions that define a sewing pattern are converted into numerical values and sequentially read a plurality of sewing data arranged in the sewing order, and based on the plurality of sewing data, the corresponding hole stitches are formed. Controlling the cloth feeding means and the sewing means;
A boring machine characterized by comprising identifier setting means for setting a lowering identifier for lowering the cutter with respect to at least one sewing data in the sewing of the front tacking portion after sewing the reverse staggered portion . In the drilling machine according to claim 6,
The control means includes
When the sewing data that has been read sets the lowering identifier, an instruction signal is output to the cutter vertical movement drive mechanism so as to lower the cutter. In the drilling sewing machine according to claim 6 or 7,
A moving position setting means for setting the coordinate value of the needle drop position of the sewing data in which the descent identifier is set to the moving position of the cutter;
The control means includes
The boring machine characterized by controlling the cutter advance / retreat driving mechanism so as to move the cutter to the moving position set by the moving position setting means. In the drilling machine according to claim 8,
A boring machine characterized by further comprising movement position correction means for correcting the movement position set by the movement position setting means. In the boring machine according to claim 9,
The moving position correcting means is
The correction amount of the moving position according to at least one of the rotational speed of the sewing machine motor, the cloth feed speed of the cloth feed means, the cloth feed pitch of the cloth feed means, the type of work cloth, and the type of sewing thread. A holed sewing machine characterized by determining the.

Images