JP2005198968A - Holing machine, holing stitch forming method, and holing stitch sewing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the rugged feeling of a buttonhole overcast stitch in the case of forming at least a pair of first and second straight overcast stitches and a bar tacking stitch which is positioned at the ends of the straight overcast stitches in turns. <P>SOLUTION: When an eyelet holing stitch 39 is formed, a sewing mechanism immediately after sewing left straight overcast stitches 39b is rotated by 90° clockwise in a plane view by a rotary mechanism and a feed slide is shifted toward the left straight overcast stitches 39b from the right straight overcast stitches 39a by about half the length L of the bar tacking stitches 39d before starting the sewing of the bar tacking stitches 39d. Then the bar tacking stitches 39d are formed so as to become a stitch forming direction D4. Accordingly, the loop connection parts DSc of bobbin thread loops in the bar tacking stitches 39d are formed at parts spaced from the lower end parts of the loop connection parts DSc of the bobbin thread loops in the right and left straight overcast stitches 39a, 39b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a boring machine, a boring stitch forming method, and a boring stitch sewing program, and more particularly, in a bouncing seam having at least first and second linear holing seams and a tack seam. In this way, the overlap of the loop joint formed on the straight seam to be sewn and the loop joint on the tacking seam to be sewn is avoided, and the stiff feeling of the hole seam is eliminated. About.

  Conventionally, a hole having a pair of left and right straight stitches without a pigtail stitch or a pair of left and right straight stitches formed by a pair of left and right straight stitches. In a boring machine that sews various boring stitches such as bouncing seams, a sewing mechanism that drives the needle bar and the looper facing the needle bar in synchronism with each other, and a looper base and needle bar provided with a looper And a feed mechanism for moving the feed base on which the work cloth is placed in the X direction and the Y direction are provided, and various stitches such as eyelet stitches are provided. Various hole stitches are formed by driving and controlling the sewing mechanism, the feed mechanism, and the rotation mechanism based on the eye data (see, for example, Patent Document 1).

  By the way, recently, not only various hole stitching stitches such as eyelet stitching stitches are formed by the drilling sewing machine, but also added to the end portion of the straight stitching stitch, and the tacking stitch data is used. The straight tack stitches are formed in a direction perpendicular to the stitch formation direction of the left and right straight stitches.

  For example, in the eyelet-operated sewing machine described in Japanese Patent Application Laid-Open No. 9-225166 (Patent Document 2), as shown in FIG. 23 (A), in the sewing mechanism having a needle bar and a looper base, When the direction of the throat plate 26 included in the sewing mechanism, that is, the stitch formation direction D1 is set to “0 °” and FIG. 24 is referred to, FIG. 24 shows the right straight stitch 139a on the right side in the stitch formation direction D1 (FIG. 23A: “0 °”), eyelet stitching 139c (FIG. 23 (B) “0 ° to 180 °”) in the stitch formation direction D2, and left straight stitching 139b (FIG. 23 (C) in the stitch formation direction D3. ), Fig. 23 (D) “180 °”), and then the needle bar and throat plate 26 (looper base) are further rotated counterclockwise to “270 °” shown in FIG. 23 (E). Rotate to return the sewing position to the outside of the end of the left straight stitch 139b In the stitch formation direction RD4, from the lower end portion of the left straight stitching stitch 139b to the lower end portion of the right straight stitching stitch 139a, a linear shape is formed from the barbed stitching start position Ks. A bar-tacking stitch 139d is formed (FIG. 23 (F), FIG. 23 (G) “270 °”) (see, for example, Patent Document 2).

  In this way, when the eyelet seam 139 having the tack seam is formed, as shown in FIG. 24, the lower thread DS is the upper thread US at the pair of left and right straight seams and bar seams. The loop coupling portion DSc is a position that is offset from the outer needle 10 (No) of the sewing needle and is biased toward the inner needle 10 (Ni) near the eyelet hole portion DH. That is, with respect to the stitch formation directions D1 to D3, a loop coupling portion DSc with the lower thread DS is formed in the vicinity of the left inner needle 10 (Ni). Therefore, the loop coupling portion DSc with the lower thread DS in the tack-fastening stitch 139d is formed biased in the vicinity of the inner needle 10 (Ni) on the side of the pair of straight stitches 139a, 139b.

Japanese Patent No. 2762697 (pages 4-5, FIGS. 1-3) JP-A-9-225166 (Pages 4-5, FIG. 12)

  As described above, in the case where the eyelet stitching stitches having the tacking seams are continuously formed by the boring machine, the stitch forming direction RD4 of the tacking stitches is, as shown in FIG. Since it is in the right direction from the overlock seam to the right straight over seam, the loop joint with the lower thread of the tack seam to be sewn later is connected to the loop joint at the lower end of the left and right straight seams. Each of them overlaps, and the tack seam swells and rises. For this reason, there is a problem in that the larger the hole stitching for a large button and the finer the stitch pitch, the more harsh the feel and feel, and the lower the quality of the stitched product.

  According to another aspect of the present invention, there is provided a sewing machine having a sewing mechanism that is sewn with a sewing needle that is passed through an upper thread and reciprocated in a vertical direction and a looper that is passed through a lower thread and is reciprocated in a horizontal direction. Control that controls a rotation mechanism that can rotate around the center, a relative movement mechanism that relatively moves the work cloth and the sewing mechanism within a plane, and a drive means that drives the sewing mechanism, the rotation mechanism, and the relative movement mechanism In the boring machine, which comprises means and sequentially forms at least a pair of first and second straight overlock stitches and a tack seam located at the end of these straight over stitches, the control means When the seam is formed, the driving means is controlled so that the loop joint portion of the tacking seam is formed at a position separated from the end portion of the loop joint portion of the first and second straight overlock seams. is there.

  In the case of sewing a bouncing seam with a boring machine, the upper thread passed through the sewing needle and the lower thread loop formed by the bobbin thread passed through the looper are entangled. The first and second straight stitches are sewn in the same manner as in the prior art. However, when forming the tack seam, the loop coupling portion in which the lower thread loop in the tack seam is entangled with the upper thread is the first. Since the lower thread loop in the second straight overlock seam is formed at a position separated from the end of the loop joint where the upper thread is entangled with the loop joint of the first and second straight over seams Overlap with the loop joint of the seam is avoided, and the tack seam does not swell and rise.

  Here, the control means rotates the sewing mechanism in the direction to sew the first straight overlock seam until it is reversed by the rotation mechanism before starting the sewing of the second straight overlock seam, and performs the tacking sewing. Before starting the stitching of the eye, the looper of the sewing mechanism is in a direction to sew the second straight overlock seam, and is a needle drop point close to the seam of the first and second straight overlock seams. When the looper located on the needle side is rotated away from the end portions of the first and second straight overlock stitches by the rotation mechanism (claim 2 dependent on claim 1), the overcast seam is sewn. In this case, the sewing needle swings on the inner needle side, which is the needle drop point near the stitches of the first and second straight stitches, and on the outer needle side, which is farther between the stitches. Since the looper located on the inner needle side through which the thread is passed operates, the lower thread loop for the upper thread is generally used. Loop coupling part confounding is knitted into a position biased to the inner needle side. However, since the looper is rotated away from the ends of the first and second straight stitches by the rotation mechanism before the start of the tacking stitches, the tacking stitches are the same as in the first aspect. Will not swell up.

  Here, when the control means rotates the sewing mechanism so that the looper moves away from the end portions of the first and second linear overlock stitches by the rotation mechanism before the start of sewing of the tacking seam, Before the start of sewing of the linear overlock seam, the direction of rotation for reversing the sewing mechanism in the direction in which the first straight overlock seam is sewn, When the sewing mechanism is rotated by a rotation mechanism by a predetermined angle within a range where the stitch formation direction of the tack-fastening seam intersects (Claim 3 dependent on Claim 2), when sewing the second straight overlock seam The sewing mechanism in the direction in which the first straight overlock seam is sewn is reversed, and when sewing the tacking seam, the second straight over seam is sewn from the direction in which the first straight over seam is sewn. In the direction opposite to the direction of rotation that reverses Since the sewing mechanism is rotated by a predetermined angle (for example, about 90 °) within the range where the seam forming direction of the straight overlock seam and the seam forming direction of the tacking seam intersect, the lower thread is passed. The looper moves away from the end portions of the first and second straight stitches. Therefore, as in the first aspect, the tacking seam does not swell and rise.

  Here, when the control means rotates the sewing mechanism so that the looper moves away from the end portions of the first and second linear overlock stitches by the rotation mechanism before the start of sewing of the tacking seam, Before the start of sewing of the linear overlock seam, the rotation direction for reversing the sewing mechanism in the direction to sew the first straight overlock seam, When the sewing mechanism is rotated by a rotation mechanism by a predetermined angle within a range where the stitch-forming seam formation direction intersects (Claim 4 dependent on Claim 2), the second straight seam When sewing, the sewing mechanism in the direction to sew the first straight overlock stitch is reversed, and when sewing the tacking stitch, the second straight overlock sewing is performed from the direction in which the first straight overlock stitch is sewn. In the same direction as the direction of rotation that reverses the direction of sewing the eye, Since the sewing mechanism is rotated by a predetermined angle (for example, about 270 °) within the range in which the seam forming direction of the second straight overlock seam and the seam forming direction of the tacking seam intersect, The looper through which the thread has passed is moved away from the ends of the first and second straight-line stitches. Therefore, as in the first aspect, the tacking seam does not swell and rise.

  Here, the control means uses a relative movement mechanism so that the work cloth and the sewing mechanism are overlapped so that the end of the first and second straight-line stitches overlaps before the start of sewing the seam. Are moved relative to each other (Claim 5 depending on any one of Claims 1 to 4), when the tacking seam is sewn, the tacking seam is the first and second straight lines. Since it overlaps with the end portion of the overlock stitch, fraying of the first and second straight overlock stitches is prevented by the tacking stitch.

  According to a sixth aspect of the present invention, there is provided a sewing mechanism for sewing with a sewing needle that is passed through an upper thread and reciprocated in the vertical direction and a looper that is passed through a lower thread and is reciprocated in the horizontal direction. A rotation mechanism capable of rotating the shaft around a vertical axis, a relative movement mechanism for relatively moving the work cloth and the sewing mechanism within a plane, and a driving means for driving the sewing mechanism, the rotation mechanism, and the relative movement mechanism. In a sewing method in which at least a pair of first and second straight-line stitching stitches and a tack seam positioned at an end portion of these straight-line stitching stitches are sequentially formed by a boring machine having control means for controlling. When forming the tack seam, the loop joint portion of the tack seam is formed at a position separated from the end of the loop joint portion of the first and second straight over stitches.

  In the case of sewing a bouncing seam with a boring machine, the upper thread passed through the sewing needle and the lower thread loop formed by the bobbin thread passed through the looper are entangled. The first and second straight stitches are sewn in the same manner as in the prior art. However, when forming the tack seam, the loop coupling portion in which the lower thread loop in the tack seam is entangled with the upper thread is the first. Since the lower thread loop in the second straight overlock seam is formed at a position separated from the end of the loop joint where the upper thread is entangled with the loop joint of the first and second straight over seams Overlap with the loop joint of the seam is avoided, and the tack seam does not swell and rise.

  According to a seventh aspect of the present invention, there is provided a sewing program for sewing with a sewing needle that is passed through an upper thread and reciprocated vertically and a looper that is passed through a lower thread and reciprocated horizontally. A rotary mechanism that can rotate about a vertical axis, a relative movement mechanism that relatively moves the work cloth and the sewing mechanism within a plane, and at least one pair of first and second linear overlock stitches In a computer of a control means for controlling a driving means for driving a sewing mechanism, a rotation mechanism, and a relative movement mechanism in a hole sewing machine that sequentially forms an eye and a tacking seam positioned at the end of these linear seam stitches, In order to execute a stitch control routine in which the loop joint portion of the tack seam is formed at a position separated from the end of the loop joint portion of the first and second straight over stitches when forming the tack seam The program is included.

  A control means for controlling a plurality of drive means so as to form at least a pair of first and second straight overlock stitches and a tack seam located at the end of these straight overturn stitches in a computer; When forming the tack seam, a stitch control routine is executed in which the loop joint portion of the tack seam is formed at a position separated from the end of the loop joint portion of the first and second straight overlock stitches. Thus, the same effect as in claim 1 is obtained.

  According to the first aspect of the present invention, the loop includes a sewing mechanism, a rotation mechanism, a relative movement mechanism, and a control means, and the control means interlaces with the lower thread loop in the tack seam when forming the tack seam. Since the driving means is controlled so that the coupling portion is formed at a position separated from the end of the loop coupling portion that is entangled with the lower thread loop in the first and second linear stitches, the first and second linear stitches are controlled. The overlap between the loop joint of the seam and the loop joint of the tacking seam is avoided, the tacking seam does not swell up and rises, eliminating the jerky feeling of the hole seam and improving the quality of the sewing product Can be made.

  According to the second aspect of the present invention, the control means, before starting the sewing of the second straight overlock stitch, until the sewing mechanism in the direction for sewing the first straight overlock stitch is reversed by the rotation mechanism. The looper of the sewing mechanism in a direction to sew the second straight overlock seam before the start of sewing of the tack-fastening seam and close to the seam of the first and second straight overlock seams The looper located on the inner needle side, which is the needle drop point, is rotated by the rotating mechanism so as to move away from the end portions of the first and second straight stitches, so that it is located on the inner needle side through which the lower thread is passed. Even if the loop coupling part where the lower thread loop for the upper thread is entangled with the upper thread by the operation of the looper is knitted at a position biased to the inner needle side, the looper is rotated before the start of sewing of the tacking seam. To move away from the end of the 1st and 2nd straight stitches Since is rotated, the same effect as claim 1.

  According to a third aspect of the present invention, the control means rotates the sewing mechanism so that the looper moves away from the ends of the first and second linear overlock stitches by the rotation mechanism before starting the sewing of the tack-fastening stitches. In this case, before the start of sewing of the second straight overlock seam, the second straight over seam is formed in the direction opposite to the rotation direction for reversing the sewing mechanism in the direction in which the first straight over seam is sewn. The sewing mechanism is rotated by a rotation mechanism by a predetermined angle (for example, about 90 °) within a range where the seam forming direction of the seam and the seam forming direction of the tacking seam intersect. Since the looper through which the lower thread is passed is sewn in a state where the looper is away from the end portions of the first and second linear overlock stitches, the same effect as in the first aspect can be obtained. Other effects similar to those of the second aspect are achieved.

  According to the invention of claim 4, the control means rotates the sewing mechanism so that the looper is moved away from the end portions of the first and second linear overlock stitches by the rotation mechanism before the start of sewing of the tacking seam. In this case, the second linear overlock stitch is in the same direction as the rotation direction for reversing the sewing mechanism in the direction in which the first straight over stitch is sewn before the start of the second straight over stitch. Since the sewing mechanism is rotated by a rotation mechanism by a predetermined angle (for example, about 270 °) within a range where the seam forming direction of the seam and the seam forming direction of the tacking seam intersect, Since the looper through which the lower thread is passed is sewn in a state where the looper is away from the end portions of the first and second linear overlock stitches, the same effect as in the first aspect can be obtained. Other effects similar to those of the second aspect are achieved.

  According to a fifth aspect of the present invention, the control means includes a relative movement mechanism so that the tacking seam overlaps the end portions of the first and second straight-line stitching seams before starting the stitching of the tacking seams. Since the work cloth and the sewing mechanism are moved relative to each other, when the tacking seam is sewn, the tacking seam overlaps the end portions of the first and second straight-line stitching seams. The flanking stitch can reliably prevent fraying of the first and second straight stitches. Other effects similar to those of any one of claims 1 to 4 can be achieved.

  According to the sixth aspect of the present invention, the loop coupling portion in the tack seam includes the sewing mechanism, the rotation mechanism, the relative movement mechanism, and the control means. Since it forms in the position spaced apart from the edge part of the loop coupling | bond part in a straight edge stitch, there exists an effect similar to Claim 1.

  According to the seventh aspect of the present invention, a plurality of driving means is formed so as to sequentially form at least one pair of first and second straight overlock stitches and a tack seam located at the end of these straight overturn stitches. When forming the tacking seam in the computer, the loop coupling part of the tacking seam is formed at a position separated from the end of the loop coupling part of the first and second straight over stitches. Since the program for executing the stitch control routine to be executed is included, the program including the stitch control routine is executed by the control means.

  The electronic hole sewing machine according to the present embodiment forms a pair of left and right first and second linear overlock stitches and a pigeon overlock seam, then moves the sewing position to the first straight overlock seam side, and moves the sewing mechanism. The tack seam is formed after being rotated about 90 ° clockwise in plan view.

  As shown in FIGS. 1 and 2, the electronic eyelet sewing machine 1 is integrally provided with a bed portion 2 having a substantially rectangular box shape and an arm portion 3 that continuously extends forward from the upper portion of the rear portion. It is configured and placed on the sewing machine table 4.

  The sewing machine table 4 includes a sewing machine motor 5 (see FIG. 9) serving as a driving source of a sewing mechanism for synchronously driving the needle bar 6 up and down and swinging, the looper mechanism 25, and the like, and a plurality of types of eyelet seams. An operation panel 6 (see FIG. 9) to be selected alternatively, a stepping start / stop switch 7 (see FIG. 8), etc. are provided, and a control device 8 comprising a microcomputer for controlling the operation of each mechanism. (See FIG. 9).

  A needle bar 11 having a sewing needle 10 is provided at the distal end of the arm 3 so as to be movable up and down. Although not shown in detail, the rotational force of the main shaft 12 that is rotated by driving of the sewing machine motor 5 is transmitted to the cam mechanism. It is driven up and down while swinging left and right by a predetermined width. In this case, one rotation of the main shaft 12 causes the needle bar 11 to move up and down twice between a left swing position (inner needle position) and a right swing position (outer needle position).

  3 and 4, the bed portion 2 is provided with a looper base 14 including a looper mechanism 25 having a pair of left and right loopers 13a and 13b so as to face the needle bar 11. The looper base 14 is rotatable around a vertical axis by a rotation mechanism 15 described later. As shown in FIG. 4, these two loopers 13a and 13b are swung in time with the vertical movement of the needle bar 11 by the rotation of the main shaft 12 via a link mechanism and a cam mechanism provided on the looper base 14. It is designed to be driven.

  Here, the upper thread US supplied from the thread supply source is inserted into the sewing needle 10, and the lower thread DS is inserted into the tip of the left looper 13a, and the right looper 13b is threaded into the lower loop while weaving the upper thread loop. DS is entangled to form a loop coupling portion DSc.

  Next, the needle bar 11 and the looper base 14 are integrally rotated around the vertical axis in the horizontal plane by the rotation mechanism 15 including the θ-direction drive motor 50 and the gear mechanism provided in the bed portion 2. ing. Here, a sewing mechanism is constituted by the sewing needle 10 and the looper mechanism 25, and the rotation mechanism 15 that can rotate the sewing mechanism around the vertical axis will be briefly described with reference to FIG.

  Pulleys 17 and 18 are respectively fixed to the upper end and lower end of the race rotation shaft 16 in the vertical direction, and the timing belt 20 is hooked over the upper pulley 17 and the needle bar block 19 in which the needle bar 11 is fitted. Has been. On the other hand, the timing belt 23 is hung over the lower pulley 18, the drive pulley 21 fixed to the drive shaft of the θ-direction drive motor 50, and the driven gear 22 of the looper base 14. Therefore, the rotation of the θ-direction drive motor 50 allows the needle bar 11 and the looper base 14 to rotate synchronously around the vertical axis via the race rotation shaft 16 and the timing belts 20 and 23. .

  On the upper portion of the looper base 14, a double ring looper mechanism 25 having the above-described pair of left and right loopers 13a, 13b is provided, and a throat plate 26 shown in FIGS. The throat plate 26 is formed with a thread insertion hole 26a through which the core thread 27 is inserted, and an inner needle passing position 26b through which the sewing needle 10 swings inward at the inner needle 10 (Ni) passing through the throat plate 26. A needle hole 26d is formed including an outer needle passage position 26c that passes through the throat plate 26 in the outer needle 10 (No) in which the sewing needle 10 is swung outward.

  Therefore, when the core thread 27 is sewn with the upper thread US at the time of forming the eyelet seam, the end of the core thread 27 supplied from the core thread supply source is indicated by the cloth feed direction (shown by a broken arrow). ) Through the thread insertion hole 26a.

  As shown in FIGS. 2 and 5, the bed 2 is provided with a knife 30 which is fixedly disposed on the rear side of the looper base 14 to form the eyelet hole DH. A punching hammer 32 that is attached to and detached from the knife 30 from above and is separated from above is swingably provided.

  A hammer body 33 is detachably attached to the tip of the punching hammer 32 and is driven by a hammer drive mechanism including an air cylinder 52 provided in the bed portion 2, so that the hammer body 33 and the knife 30 cooperate with each other. By the action, the eyelet hole portion DH composed of a substantially circular eyelet portion and a linear foot portion connected to the eyelet portion is punched in the work cloth.

  As shown in FIGS. 1, 2, and 5, a feed base 35 on which a work cloth used for eyelet stitching is set is provided on the upper surface of the bed 2. The feed base 35 has a thin rectangular box shape as a whole, and a portion facing the looper base 14 and the knife 30 is open. Further, as shown in FIG. 5, a pair of left and right cross plates 36 and 37 made of metal are provided on the upper surface of the feed base 35, respectively.

  Positioned on the left and right sides of the openings 36a and 37a formed in the cross plates 36 and 37, cloth pressers (not shown) for pressing the work cloth are provided. A substantially first half portion of both cross plates 36 and 37 is covered with a guide plate 38.

  In the bed portion 2, an X-direction moving mechanism (not shown) that feeds and moves the feed base 35 in the X direction (left and right direction) by driving an X direction drive motor 55 that comprises stepping, and a Y direction that comprises a stepping motor. A Y-direction moving mechanism (not shown) that feeds and moves in the Y direction (front-rear direction) by driving the drive motor 57 is provided. Here, a relative movement mechanism is constituted by an X-direction movement mechanism, a Y-direction movement mechanism, and a needle rocking mechanism that rocks the needle bar 11 left and right.

  Here, the eyelet seam 39 will be briefly described. As shown in FIG. 12, the eyelet seam 39 includes a right straight seam 39a, a left straight seam 39b, an eye seam 39c, a tack seam 39d, and the like. Therefore, basic stitch formation for forming these overlock stitches 39a to 39d will be briefly described.

  The sewing needle 10 is alternately and repeatedly swung over the inner needle 10 (Ni) approaching the eyelet hole portion DH and the outer needle 10 (No) separated outward by a predetermined distance from the sewing needle 10 while being alternately swung. Is moved in the cloth feed direction (Y direction) indicated by the solid line arrow by the feed pitch by driving the Y direction drive motor 57.

  However, when sewing the right straight stitching stitch 39a, the left straight stitching stitch 39b, and the tacking stitch 39d, the X direction drive motor 55 and the Y direction drive motor 57 are driven, and the eyelet stitch stitch 39c. When the sewing is performed, the θ-direction drive motor 50 is driven. Further, when the interval between the inner needle 10 (Ni) and the outer needle 10 (No) is changed, the feed base 35 is moved and adjusted every time the needle is swung by driving the X and Y direction drive motors 55 and 57. The

  As shown in FIG. 8, the looper mechanism 25 has a left looper 13a through which a lower thread DS is passed, and a right looper 13b. The right looper 13b has an outer needle 10 (No. ) And the outer upper thread loop formed when penetrating the work cloth is caught, and the next inner needle 10 (Ni) is swung through the outer upper thread loop to penetrate the work cloth. Pass the inner upper thread loop.

  On the other hand, the left looper 13a passes the lower thread loop formed by the lower thread DS through the lower end DS through the inner upper thread loop and the work cloth by the next outer needle 10 (No). The outer upper thread loop formed when the thread is passed through is passed through the lower thread loop.

  In this way, the upper thread US and the lower thread DS are stitched so as to be alternately knitted by the left and right loopers 13a and 13b, so that the lower thread DS illustrated by the diagonal lines is an inner part away from the outer needle 10 (No). It is knitted at a position biased toward the needle 10 (Ni). Needless to say, the lower thread loop is also knitted at the position where the lower thread loop is biased toward the inner needle 10 (Ni) similarly at the tacking seam 39d. Therefore, as shown in FIGS. 8 and 12, the loop coupling portions DSc where the lower thread loops are entangled are sequentially formed on the plurality of inner needles 10 (Ni) side, that is, on the left side with respect to the stitch formation direction D. It has become so.

  Next, an outline of the control system of the electronic eyelet hole sewing machine 1 will be described based on the block diagram of FIG.

  A control device (this corresponds to the control means) 8 of the electronic eyelet sewing machine 1 includes a microcomputer including a CPU 40, a ROM 41, and a RAM 42, and an input interface connected to the microcomputer via a bus 43 such as a data bus. 44, an output interface 45, and the like.

  The input interface 44 is supplied with signals from the start / stop switch 7, the presser foot switch 47 connected to the presser foot, the timing signal generator 48, and the operation panel 6. From the output interface 45, a drive circuit 49 for the sewing machine motor 5, a drive circuit 51 for the θ-direction drive motor 50, and a drive for the electromagnetic switching valve 53 for the air cylinder 52 that drives the hammer 32 for punching. In addition to the circuit 54, the drive circuit 56 for the X-direction drive motor 55 that moves and drives the feed base 35, and the drive circuit 58 for the Y-direction drive motor 57, a drive signal and a drive pulse signal are sent to each of the operation panels 6. Is supplied.

  Here, each of the sewing machine motor 5, the θ-direction drive motor 50, the X-direction drive motor 55, and the Y-direction drive motor 57 corresponds to a drive unit. The timing signal generator 48 is provided so as to be linked to the main shaft 12 of the electronic eyelet sewing machine 1, detects the rotational phase of the main shaft 12, and outputs various phase signals.

  The ROM 41 has a hammer drive in addition to a drive control program for driving the sewing mechanism based on the stitch data of a plurality of types of seam stitches and various types of the stitch seam data. Various drive control programs for driving the mechanism, the feed base 35, and the rotation mechanism 15 and a hole stitching sewing control program for hole stitch stitching control specific to the present application, which will be described later, are stored.

  Further, the RAM 42 has a stitch data memory for storing needle drop position data of the inner needle 10 (Ni) and outer needle 10 (No) obtained by calculation, and hole stitching data including the plurality of needle drop position data. In addition, various work memories and buffers are provided.

  Here, the eyelet seam 39 will be briefly described. As shown in FIG. 12, the right straight seam 39a (this corresponds to the first straight seam) 39a and the left straight seam. 39b (which corresponds to the second straight overlock stitch) 39b, a curved eyelet stitch 39c extending from the end of the right straight over stitch 39a to the start of the left straight over stitch 39b, and a pair of right and left And the barbed seam 39d located at the lower end of the straight overlock seams 39a and 39b.

  Next, the routine of the stitching stitch sewing control executed by the control device 8 of the electronic eyelet stitching machine 1 will be described based on the flowchart of FIG. However, in the figure, reference sign Si (i = 11, 12, 13,...) Represents each step.

  When the eyelet stitching stitch 39 to be used for sewing is selected on the operation panel 6 and the start / stop switch 7 is operated, this control is started. First, the sewing data of the selected eyelet stitching stitch 39 is stored. Read from the ROM 41 (S11). Next, the sewing mechanism, that is, the throat plate 26 (looper base 14) is turned to the stitch formation direction D1 of the right straight stitch 39a (this is 0 °, see FIG. 11A) by the θ direction drive motor 50. (S12).

  Next, the X-direction drive motor 55 and the Y-direction drive motor 57 are driven, and the feed base 35 is moved so that the sewing position becomes the sewing start position of the right straight stitch 39a (S13). Next, the right straight stitch 39a is sewn (see FIG. 11A) based on the sewing data (S14). In addition, the code | symbol Ns in FIG. 12 is a sewing start position of the right straight overlock seam 39a.

  Next, based on the sewing data, the eyelet stitching stitch 39c is sewn in the stitch forming direction D2 (see FIG. 11B) (S15). In this case, the throat plate 26 is rotationally driven counterclockwise over 0 ° to 180 °. Next, the left straight over stitch 39b is sewn in the stitch formation direction D3 based on the sewing data (see FIGS. 11C and 11D) (S16).

  Next, the throat plate 26 is rotationally driven by the θ direction driving motor 50 in a clockwise direction in a plan view, that is, counterclockwise as the rotation direction of the sewing mechanism in S15, and the throat plate 26 is rotated by 90 °. (S17), and the feed base 35 is moved by the X direction drive motor 55 and the Y direction drive motor 57 so that the sewing start position becomes the start position of the tacking stitch 39d (FIG. 11E). (See S18).

  In this case, the feed base 35 is moved in the + X direction by a half of the length L of the tacking stitch 39d in a direction from the right straight stitch 39a to the left straight stitch 39b. Here, in S17, a predetermined angle within a range where the stitch formation direction D3 of the left straight stitch 39b and the stitch formation direction D4 of the tacking stitch 39d intersect is 90 ° (this is the first in claim 3). 2 is equivalent to a predetermined angle within a range where the seam forming direction of the straight seam and the seam forming direction of the tacking seam intersect.

  Next, based on the sewing data, the tacking stitch 39d is sewed in the stitch formation direction D4 (see FIG. 11F) (S19), and this control is finished. As a result, as shown in FIG. 11 (G), the eyelet seam 39 having the tacking seam 39d is formed. In FIG. 12, the symbol Ks is the sewing start position of the tacking stitch 39d, and the symbol Ne is the sewing end position. Here, S17 to S19 correspond to a stitch control routine.

  In this way, as shown in FIG. 12, the stitched eyelet stitch seam 39 has a loop coupling portion DSc, which is an entanglement point with the lower thread DS indicated by a thick line, as described above. It is formed on the 10 (Ni) side. Therefore, when forming the tacking seam 39d, the sewing mechanism is rotated 90 ° clockwise as in S17, and the sewing start position is moved toward the right straight stitch 39a as in S18.

  Therefore, since the stitch formation direction D4 of the tacking seam 39d is a direction from the right straight stitching line 39a to the left straight stitching stitch 39b, the loop coupling portion DSc in the tacking stitching stitch 39d has a right and left straight line. It is formed on the opposite side from the end of the loop coupling portion DSc in the overlock stitches 39a and 39b on the opposite side to the right and left straight overlock stitches 39a and 39b, that is, on the position spaced apart downward in FIG.

  That is, since the end of the loop coupling portion DSc in the right and left straight stitches 39a and 39b and the loop coupling portion DSc in the tacking seam 39d do not overlap each other, the tacking seam 39d is significantly swollen and raised. Therefore, it is possible to improve the quality of the sewing product by eliminating the rugged feeling of the eyelet stitching seam 39.

  Next, a modified embodiment in which the embodiment is partially modified will be described.

  1) The above-described core thread supply mechanism may use the core thread 27 to form the eyelet seam 39A. In this case, as shown in FIG. 13, the core thread 27 indicated by a two-dot chain line is sewn into the upper thread US at a substantially intermediate position between the inner needle 10 (Ni) and the outer needle 10 (No). The core thread 27 of the overlock stitches 39a and 39b and the core thread 27 of the tacking seam 39d do not overlap each other.

  2] The above-described perforated stitch sewing control may be partially changed as shown in FIG. 14, and the sewing mechanism may be rotated counterclockwise when sewing the tacking stitch 39d. In this case, S11 to S16 are the same as those in FIG. In S17A, the throat plate 26 is rotated counterclockwise by 270 ° in a plan view by the θ direction drive motor 50, and the throat plate 26 is positioned at 90 °. Also in this case, since the direction of the sewing mechanism is the same as that of the above-described embodiment, the same effect as that of the above-described embodiment can be obtained.

  3] In S17 shown in FIG. 10, as shown in FIG. 15, the throat is moved from the sewing start position in which the tacking seam 39d of the eyelet seam 39B is brought closer to the left and right straight seams 39a and 39b. The plate 26 may be formed not at the 90 ° position but at an angle that causes the plate 26 to tilt downward in a plan view, that is, 92 to 93 °. Also in this case, since the lower end portions of the left and right straight stitching stitches 39a and 39b partially overlap with the tacking stitches 39d, the fraying prevention effect by the tacking stitches 39d can be exhibited.

  4] In S17 shown in FIG. 10, as shown in FIG. 16, from the sewing start position in which the tacking seam 39d of the eyelet seam 39C is not brought close to the left and right straight seams 39a, 39b. The throat plate 26 may be formed at an angle at which the throat plate 26 is inclined not to the 90 ° position but to the left in a plan view, that is, 87 to 88 °. Also in this case, since the lower end portions of the left and right straight stitching stitches 39a and 39b partially overlap with the tacking stitches 39d, the fraying prevention effect by the tacking stitches 39d can be exhibited.

  5] By performing feed correction in the X and Y directions, as in FIGS. 12 and 13, the stitch formation direction D4 is set to the left-right direction in the drawing in plan view, and the tacking stitch 39d is formed. Good. For example, as shown in FIG. 17, in S15, the throat plate 26 is rotated clockwise by 80 °. Also, as shown in FIG. 18, the throat plate 26 is rotated clockwise by 100 ° in S15.

  6] The above-described hole stitching control in FIG. 14 relates to a modified embodiment assuming that the core thread 27 is not used. Also in this case, the rotation angle in S17A is not limited to 270 °, and the ends of the left and right linear stitches 39a and 39b and the tacking stitches 39d fray within a range where the loop coupling portion DSc does not overlap. As long as it is within a crossing range so as to prevent the rotation angle, a rotation angle of 270 ° ± α may be used.

  7] As shown in FIG. 19, in addition to the eyelet seam 39, a sleeper seam 39D not provided with an eyelet seam 39c, as shown in FIG. As shown in FIG. 22, a straight hole stitching seam 39E having eyes and a straight hole stitching seam 3F having left and right straight stitches and two upper and lower bark stitches as shown in FIG. In addition, the present invention can of course be applied when sewing various hole stitches, such as the hole stitch 39G having left and right straight stitches and barbed stitches inclined to each other. .

  8] This proposal is applicable to various kinds of sewing machines such as a sewing machine that forms a holed seam with a single loop stitch having only one looper, and a sewing machine that forms a holed seam by moving only the feed base 35 when forming the seam. Of course, the present invention can be applied to various types of hole sewing machines that sew a hole seam.

1 is a perspective view of an electronic eyelet hole sewing machine according to an embodiment of the present invention. 1 is a side view of an electronic eyelet hole sewing machine according to an embodiment of the present invention. It is a perspective view of a rotation mechanism and a looper mechanism. It is a front view of a looper mechanism. It is a top view of a feed stand. It is a top view of a throat plate. It is a perspective view of a throat plate. It is explanatory drawing of a hole stitch. It is a block diagram of a control system of an electronic eyelet hole sewing machine. It is a flowchart of a hole stitch seam control. It is explanatory drawing explaining the sewing order of an eyelet stitching stitch. It is a top view of an eyelet stitching stitch. FIG. 13 is a view corresponding to FIG. 12 using a core yarn. FIG. 11 is a diagram corresponding to FIG. 10 according to a modified embodiment. FIG. 14 is a diagram corresponding to FIG. 13 according to a modified embodiment. FIG. 14 is a diagram corresponding to FIG. 13 according to a modified embodiment. It is explanatory drawing which rotated the throat plate clockwise only by 80 degrees at the time of formation of a tack-fastening seam in connection with a change form. It is explanatory drawing which rotated the throat plate clockwise only 100 degrees at the time of formation of a tack-stopping seam in connection with a change form. It is a top view of the hole seam which concerns on a change form. It is a top view of the hole seam which concerns on a change form. It is a top view of the hole seam which concerns on a change form. It is a top view of the hole seam which concerns on a change form. FIG. 12 is a view corresponding to FIG. 11 according to a conventional technique. FIG. 14 is a view corresponding to FIG. 13 according to a conventional technique.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic eyelet overhaul sewing machine 5 Sewing machine motor 8 Control device 10 Sewing needle 13a Left looper 13b Right looper 15 Rotating mechanism 35 Feed base 39 Eyelet overhaul seam 39A Eyelet overhaul seam 39B Eyelet overhaul seam 39C Eyelet overhaul seam 41 ROM
50 θ-direction drive motor 55 X-direction drive motor 57 Y-direction drive motor DSc Loop coupling portion

Claims (7)

A sewing mechanism for sewing with a sewing needle passed through the upper thread and reciprocated in the vertical direction and a looper passed through the lower thread and reciprocated in the horizontal direction; and a rotation mechanism capable of rotating the sewing mechanism about the vertical axis; A relative movement mechanism that relatively moves the work cloth and the sewing mechanism within a plane; and a control means that controls a driving means that drives the sewing mechanism, the rotation mechanism, and the relative movement mechanism, and includes at least one pair of first mechanisms. In a bobbin sewing machine that sequentially forms a first straight overlock seam and a tack seam located at the end of the straight over seam,
The control means is configured such that when the tacking seam is formed, the loop coupling portion of the tacking seam is formed at a position separated from the end of the loop coupling portion of the first and second straight overlock seams. A boring machine characterized by controlling the driving means.   The control means rotates the sewing mechanism in a direction to sew the first straight overlock stitch until it is reversed by the rotation mechanism before starting the sewing of the second straight overlock seam, and Before the start of stitching of the stitch, the needle drop-off between the looper of the sewing mechanism in the sewing direction in which the second straight overlock seam is sewn and between the first and second straight overlock seams. 2. The boring machine according to claim 1, wherein a looper positioned on the inner needle side that is a point is rotated by the rotating mechanism so as to move away from the end portions of the first and second linear hoar stitches. .   The control means, when rotating the sewing mechanism so as to move the looper away from the end portions of the first and second straight overlock stitches by the rotation mechanism before starting the sewing of the tacking seams, Before the start of sewing of the second straight overlock stitch, the second straight over stitch in the direction opposite to the rotation direction for reversing the sewing mechanism in the direction in which the first straight over stitch is sewn. 3. The boring machine according to claim 2, wherein the sewing mechanism is rotated by the rotating mechanism by a predetermined angle within a range in which a seam forming direction of the seam and a seam forming direction of the tacking seam intersect each other. .   The control means, when rotating the sewing mechanism so as to move the looper away from the end portions of the first and second straight overlock stitches by the rotation mechanism before starting the sewing of the tacking seams, Before the start of sewing of the second straight overlock stitch, the second straight over stitch in the same direction as the rotation direction for reversing the sewing mechanism in the direction in which the first straight over stitch is sewn. 3. The boring machine according to claim 2, wherein the sewing mechanism is rotated by the rotating mechanism by a predetermined angle within a range in which a seam forming direction of the seam and a seam forming direction of the tacking seam intersect each other. .   The control means uses the relative movement mechanism to adjust the work cloth and the work cloth so that the tacking stitches overlap the end portions of the first and second straight stitches before starting the stitching of the tacking stitches. The hole sewing machine according to any one of claims 1 to 4, wherein the sewing mechanism is relatively moved. A sewing mechanism for sewing with a sewing needle passed through the upper thread and reciprocated in the vertical direction and a looper passed through the lower thread and reciprocated in the horizontal direction; and a rotation mechanism capable of rotating the sewing mechanism about the vertical axis; A boring machine having a relative movement mechanism for moving the work cloth and the sewing mechanism relatively in a plane, and a control means for controlling a driving means for driving the sewing mechanism, the rotation mechanism, and the relative movement mechanism, In a sewing method for sequentially forming at least a pair of first and second straight overlock stitches and a tack seam located at the end of these straight overturn stitches,
When forming the tack seam, the loop joint portion of the tack seam is formed at a position separated from the end of the loop joint portion of the first and second straight stitches. Stitch formation method. A sewing mechanism for sewing with a sewing needle passed through the upper thread and reciprocated in the vertical direction and a looper passed through the lower thread and reciprocated in the horizontal direction; and a rotation mechanism capable of rotating the sewing mechanism about the vertical axis; And a relative movement mechanism for relatively moving the work cloth and the sewing mechanism within a plane, and at least one pair of first and second straight overlock stitches and an end of the straight overlock stitches. In the hole sewing machine that sequentially forms the tacking seam to be controlled, the computer of the control means for controlling the driving means for driving the sewing mechanism, the rotation mechanism, and the relative movement mechanism,
When forming the tack seam, a stitch control routine is executed in which the loop joint portion of the tack seam is formed at a position separated from the end of the loop joint portion of the first and second straight-line stitches. A hole stitching sewing program characterized by including a program for the purpose.