JP2009207807A - Sewing machine and sewing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine including a hole making device capable of forming a plurality of needle drop holes for pattern sewing to be inclined by prescribed angle in a sewing advance direction, while feeding a processed fabric, based on processed fabric feeding data, and to provide a sewing method. <P>SOLUTION: An arm part of the sewing machine includes: a needle holding body 23 for holding a vertical hole making needle 22 to form in the processed fabric the needle drop holes for generating seams like saddle stitches; an elevation driving section 24 for elevating/lowering the needle holding body 23; and a turnably driving section 25 for turning and driving the needle holding body 23. In a hole making process, the plurality of needle drop holes for pattern sewing are formed, while feeding the processed fabric, based on the processed fabric feeding data obtained by adding the offset amount of an axial center of the hole making needle with respect to the axial center of a needle bar so as to correct the processed fabric feeding data. In a sewing process, sewing is performed based on the processed fabric feeding data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewing machine and a sewing method, and more particularly, a sewing machine arm portion is provided with a drilling device for forming a plurality of needle drop holes for sewing a pattern, and a plurality of needle drop holes are first formed at the time of sewing. TECHNICAL FIELD OF THE INVENTION

  Conventionally, a serie stitch-like seam 100 as shown in FIG. 14 is known as a seam applied to the sewing of a leather material or a thick cloth bag. When sewing this serie stitch-like seam 100, a needle that is capable of forming a flat needle drop hole A (commonly known as an LR needle) is attached to the needle bar, and the needle is tilted about 45 degrees clockwise with respect to the sewing progress direction. If sewing is performed in the illustrated sewing progress direction with the arrows 101 and 102 while forming the fall hole A, a M-shaped stitch can be formed in the illustrated sewing progress direction. A solid line 103 indicates the upper thread, and a broken line 104 indicates the lower thread.

  However, when serie stitch-like stitches are formed by the main sewing machine, every time the sewing progress direction changes, the leather material or work cloth to be sewn is appropriately rotated and sewed while changing the direction. A M-shaped stitch is formed in the traveling direction.

In the sewing machine described in Patent Document 1, a needle bar rotating means for rotating the sewing needle and a control means for controlling the needle bar rotating means are provided, and the conveyance direction of the material to be sewn is reversed in the control means. There is provided a discriminating means for discriminating that the region is in a region (defect occurrence direction region) where a M-shaped stitch (hitch stitch) is generated. Is controlled to rotate.
Japanese Patent Laid-Open No. 7-171284

  By the way, in the sewing machine having the work cloth feeding means capable of holding the work cloth and feeding it independently in the orthogonal X and Y directions, and the control means for driving and controlling the work cloth feed means, the needle drop hole A is formed. When a serie stitch-like stitch is formed by attaching a formable sewing needle to a needle bar, sewing is performed in a state where the sewing needle is held at a constant phase angle without being rotated around its axis, As shown in FIG. 14, the needle drop hole A is formed so as to be inclined in a certain direction.

  In the stitch line parallel to the X direction, the angle of the needle drop hole A (the phase angle of the sewing needle) with respect to the sewing progress direction is appropriate, so that the desired serie stitch-like stitch is obtained. However, in the stitch line parallel to the Y direction, the angle of the needle drop hole A with respect to the sewing progress direction is shifted by 90 ° and is not appropriate, and thus an abnormal stitch as shown in the figure is formed. Therefore, the finish of the stitches is deteriorated and the quality of the sewing product is deteriorated.

  An object of the present invention is to provide a sewing machine and a sewing machine provided with a hole punching device that forms a plurality of needle drop holes for pattern sewing at a predetermined angle with respect to the sewing progress direction while feeding the work cloth based on the work cloth feed data. Is to provide a method.

  The sewing machine according to claim 1 is a sewing machine having a work cloth feeding means capable of holding a work cloth and feeding the cloth independently in two different directions, and a control means for driving and controlling the work cloth feeding means. A needle holder for holding a vertical piercing needle for forming a needle drop hole for forming a stitch on the work cloth, an elevating drive means capable of moving the needle holder up and down, and the needle holder around the axis thereof The sewing machine arm portion is provided with a drilling device provided with a rotation drive means capable of being driven to rotate.

  While the work cloth is fed independently in two different directions by the work cloth feeding means, the needle holder is rotated about its axis according to the change in the sewing progress direction by the rotation driving means of the hole punching device. The needle holder is lifted and lowered by the lift drive means to form the needle drop holes on the work cloth, thereby forming a plurality of needle drop holes suitable for sewing patterns made of serie stitch-like stitches on the work cloth. can do.

  According to a second aspect of the present invention, in the first aspect of the invention, the lifting drive means of the punching device has an electric motor and a crank mechanism that is connected to the output shaft of the electric motor and moves the needle holder up and down. It is a feature.

  The sewing machine according to claim 3 is characterized in that, in the invention according to claim 1, the raising / lowering driving means of the punching device has a solenoid capable of raising and lowering the needle holder.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the rotation driving means of the punching device is guided by the needle holder inserted through the needle holder so as to be movable up and down, and the rotational force applied to the needle holder. And a stepping motor that rotationally drives the pulley member via a timing belt mounted on the pulley member.

  According to a fifth aspect of the present invention, the sewing machine according to any one of the first to fourth aspects, wherein the control means sews a pattern set in the work cloth feed data based on the work cloth feed data at the time of sewing. It is characterized by controlling the feeding means.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the control means sets the work cloth feed data based on the work cloth feed data when forming the needle drop hole. The work cloth feeding means, the rotation driving means, and the lifting / lowering driving means are controlled so as to form a plurality of needle drop holes for sewing the formed pattern.

  According to a seventh aspect of the present invention, in the invention of the sixth aspect, the needle drop hole is a flat and slender hole, and the control means is configured such that the needle drop hole is inclined at a predetermined angle with respect to a sewing progress direction in a plan view. The rotation driving means is controlled based on the work cloth feed data so as to face the direction.

  The sewing machine of claim 8 is the sewing machine according to claim 7, wherein the axis of the punch needle held by the needle holder of the punching device is offset from the axis of the needle bar in plan view. The control means controls the work cloth feed means and the rotation drive means based on the corrected work cloth feed data obtained by correcting the work cloth feed data using the offset amount of the offset.

  The sewing method according to claim 9 is a serie stitch-like sewing machine having a work cloth feed means capable of holding a work cloth and transferring it independently in two different directions and a control means for driving and controlling the work cloth feed means. In the method of sewing an arbitrary pattern with a stitch, a hole forming step for forming a needle drop hole for forming a stitch so as to become a preset pattern while feeding the work cloth by the work cloth feeding means, and And a sewing step of sewing a serie stitch-like stitch while dropping the needle into the needle drop hole formed in the hole-piercing step while feeding the workpiece cloth by the workpiece cloth feeding means.

  In the hole making process, a needle drop hole for forming a stitch is formed so as to have a preset pattern while feeding the work cloth by the work cloth feeding means, and then in the sewing process, the work cloth feeding means While feeding the cloth, serie stitch-like stitches are sewn while allowing the needle to drop into the needle drop holes formed in the hole making step.

  According to a tenth aspect of the present invention, there is provided a sewing method according to the ninth aspect, wherein a needle holder for holding a vertical piercing needle for forming the needle hole for forming the serie stitch-shaped stitch, and a needle holder for rotating the needle holder. A drilling device provided with a rotational drive means that can be driven dynamically and a lift drive means that can drive the needle holder up and down is provided in advance in the sewing machine arm portion, and in the drilling step, the processing is performed by the control means. A needle drop hole for forming a stitch is formed while controlling the cloth feeding means, the elevating drive means, and the rotation driving means.

  According to the first aspect of the present invention, the needle holder for holding the vertical piercing needle for forming the needle hole for forming the serie stitch-shaped stitch in the work cloth, and the raising and lowering capable of driving the needle holder up and down. Since the drilling device provided with the driving means and the rotational driving means capable of rotationally driving the needle holder about its axis is provided in the sewing machine arm portion, the work cloth is fed in two different directions by the work cloth feeding means. While the cloth is fed independently, the needle holder is rotated about its axis by the rotation driving means of the punching device according to the change in the sewing progress direction, and the needle holder is moved up and down by the elevation driving means. By forming the needle drop holes in the work cloth, a plurality of needle drop holes suitable for sewing a pattern made of serie stitch-like stitches can be formed in the work cloth. Therefore, since a plurality of needle drop holes oriented in a certain direction with respect to the sewing progress direction can be formed and sewn, the finish of the serie stitch-like stitches can be made orderly and the quality of the sewing product can be improved.

  According to the invention of claim 2, since the elevating drive means of the hole punching device has an electric motor and a crank mechanism that is connected to the output shaft of the electric motor and elevates the needle holder, the elevating / lowering mechanism has a simple structure. It becomes a drive means.

  According to the invention of claim 3, since the elevating drive means of the punching device has a solenoid capable of elevating and driving the needle holder, it becomes an elevating drive means having a small and simple structure.

  According to the invention of claim 4, the rotation driving means of the hole punching device includes a pulley member capable of guiding the needle holder and transmitting a rotational force to the needle holder, and a pulley member via the timing belt. Since it has a stepping motor that is rotationally driven, the rotational driving means has a simple structure.

  According to a fifth aspect of the present invention, the control means controls the work cloth feed means so as to sew the pattern set in the work cloth feed data based on the work cloth feed data at the time of sewing. Patterns can be sewn based on the data.

  According to a sixth aspect of the present invention, the control means, when forming the needle drop hole, based on the work cloth feed data, the work cloth feed means, the rotation drive means, and the lift drive means, By controlling this, it is possible to form a plurality of needle drop holes for sewing the pattern set in the work cloth feed data.

  According to the invention of claim 7, the needle drop hole is a flat and slender hole, and the control means is arranged so that the needle drop hole faces a direction inclined by a predetermined angle with respect to the sewing progress direction in a plan view. In addition, since the rotation driving means is controlled based on the work cloth feed data, even if the sewing progress direction changes, it is possible to form a needle drop hole inclined at a predetermined angle with respect to the sewing progress direction.

  According to the invention of claim 8, the shaft center of the piercing needle is arranged offset with respect to the shaft center of the needle bar in plan view, and the control means sets the work cloth feed data to the offset offset. In order to control the work cloth feed means and the rotation drive means based on the corrected work cloth feed data corrected using the amount, a plurality of needle drop holes for sewing the pattern set in the work cloth feed data are provided. Can be configured automatically.

  According to the ninth aspect of the present invention, when an arbitrary pattern is sewn with serie stitch-like stitches by the sewing machine, the pattern is set in advance while feeding the work cloth by the work cloth feeding means in the drilling step. A needle stitch hole for forming a stitch is formed in the needle, and then a serie stitch-like stitch is formed while the needle is dropped into the needle hole formed in the drilling process while feeding the work cloth by the work cloth feeding means in the sewing process. In order to sew, a needle drop hole for forming a stitch is formed while feeding the work cloth by the work cloth feeding means on the basis of the work cloth feed data, using the hole punching needle arranged at a position offset from the sewing needle on the sewing machine. It becomes possible.

  According to the tenth aspect of the present invention, the needle holder that holds the vertical piercing needle that forms the needle hole for forming the serie stitch-shaped stitch, and the pivot that can rotate the needle holder. A drilling device including a driving unit and a lifting driving unit capable of driving the needle holder to move up and down is provided in advance in the sewing machine arm portion. In the drilling step, the control unit controls the work cloth feeding unit and the rotating unit. In order to form a needle drop hole for stitch formation while controlling the dynamic drive means and the elevating drive means, in the drilling process, the rotation angle of the drill needle is controlled according to the change in the sewing progress direction. Therefore, the needle drop hole can be formed so that the needle drop hole is in a constant inclined state with respect to the sewing progressing direction.

Hereinafter, the best mode for carrying out the present invention will be described based on examples.
However, the following examples include a sewing machine and a sewing method.

  As shown in FIG. 1, a sewing machine 1 is placed on a work table (not shown), a bed portion 2, a pedestal portion 3 standing up from a rear end portion of the bed portion 2, and a pedestal portion. 3 has an arm portion 4 or the like extending forward from the upper end portion of 3 so as to face the bed portion 2. A sewing machine motor 5 (see FIG. 6), a main shaft that is rotationally driven by the sewing machine motor 5, and a sewing needle 7 via a needle bar 6 by the rotational driving force of the main shaft are provided on the pedestal portion 3 and the arm portion 4. A needle bar up-and-down movement mechanism that drives up and down, a balance up-and-down movement mechanism that drives the balance 8 up and down by the rotational driving force of the main shaft, and a presser foot 9 that moves up and down intermittently connected to the needle bar up-and-down movement mechanism. A presser foot vertical movement mechanism and the like are provided. However, since these are known ones, their description is omitted here.

  The bed 2 includes a bed main body 2A on which the pedestal 3 is erected and a cylinder bed 10 extending forward from the bed main body 2A. The bed portion 2 includes a needle plate 11, a feed base 12, a cloth receiving plate 13 having a rear end connected to the feed base 12, and a cloth presser member 14 that presses a work cloth onto the cloth receiving plate 13. , A cloth feed mechanism 15 (working cloth feed means) (not shown) that can move the cloth receiving plate 13 and the cloth presser mechanism 15 independently in the front-rear direction (Y direction) and the left-right direction (X direction). A vertical hook (not shown) that forms stitches in time with the vertical movement of the sewing needle 7, a lower shaft (not shown) that transmits the rotational driving force from the sewing machine motor 5 to the vertical hook, and at the end of sewing A thread trimming mechanism (not shown) for cutting the upper thread and the lower thread is provided.

Next, the cloth presser mechanism 15 will be briefly described.
The presser foot mechanism 15 includes a presser arm 16 that rises from the feed base 12 and extends forward, a presser attachment portion 17 provided at the front end of the presser arm 16, and a horizontal pivot in the horizontal direction on the presser arm 16. A pair of left and right presser arm levers 18 mounted so as to be rotatable around a support shaft 18a, and a pair of presser arm levers 18 to which the rear end portion of the presser foot member 14 is fixed, and the presser arm levers 18 An elastic urging mechanism (not shown) for urging the rear end portion upward (cloth pressing direction) with a compression spring, and the presser arm lever 18 against the elastic urging force of the elastic urging mechanism. A presser foot release mechanism (not shown) that rotates in the presser foot release direction (see FIG. 5) and the like, and the presser foot motor 19 of the presser foot release mechanism is connected to the control device 50 by a foot pedal (not shown). It is configured to be operable.

Next, the structure of the punching device 20 will be described.
As shown in FIGS. 2 and 3, the punching device 20 includes an attachment frame 21, a needle holder 23, an elevating drive mechanism 24, and a rotation drive mechanism 25. The needle holder 23 holds a vertical piercing needle 22 that forms a serie stitch-shaped stitch formation needle drop hole in the work cloth. The lift drive mechanism 24 drives the needle holder 23 up and down. The rotational drive mechanism 25 rotationally drives the needle holder 23 around its axis. The drilling device 20 is attached to the left side surface of the arm portion 4 of the sewing machine 1. As shown in FIG. 4, the axis Q of the needle holder 23 is separated from the axis P of the needle bar 6 by an offset amount K to the left (−X direction) in plan view.

The attachment frame 21 is formed in a box shape in which the right side surface is opened by a main plate 21a, a bottom plate 21b, a front plate 21c, a top plate 21d, and a rear plate not shown. In FIG. 2, only the main plate 21a and the bottom plate 21b are shown.
As shown in FIG. 5 (a), the piercing needle 22 is a so-called “LR needle” having an eye hole 22a. As shown in FIG. 5B, the piercing needle 22 forms a flat needle drop hole A that is inclined by about 45 ° clockwise with respect to the sewing progress direction F during sewing. The piercing needle 22 is a needle that can sew M-shaped stitches (serie stitch-like stitches).

  As shown in FIGS. 2 and 3, the lifting drive mechanism 24 includes a solenoid 27 that can drive the needle holder 23 up and down by a predetermined stroke in cooperation with a compression coil spring 26. The solenoid 27 is attached to an attachment plate 28 fixed to the inner surface of the main plate 21a. The rotation drive mechanism 25 includes a pulley member 29, a timing belt 30, and a stepping motor 31. The pulley member 29 is inserted through the needle holder 23 so as to be movable up and down, and transmits a rotational force to the needle holder 23. The timing belt 30 connects the pulley member 29 and the drive shaft of the stepping motor 31. The stepping motor 31 rotationally drives the pulley member 29 via the timing belt 30. The stepping motor 31 is attached to the main plate 21a in an inverted posture. The pulley member 29 is rotatably supported by a bracket 32 fixed to the main plate 21a via a bearing 40 (see FIG. 3).

  As shown in FIG. 3, the needle holder 23 includes a needle bar 33 and a needle bar support 34 that is externally fitted and fixed to the needle bar 33. A perforated needle 22 is fixed to the lower end portion of the needle bar 33 with a fixing screw 35. The large-diameter portion 33a of the needle bar 33 is fitted into the needle bar support 34 in close contact, and the small-diameter portion 33b of the needle bar is fitted into the needle bar support 34 with a small gap. The small-diameter portion 33 b of the needle bar 33 is fixed to the needle bar support 34 by a pair of set screws 37 screwed into a pair of left and right screw holes 36 formed in the needle bar support 34.

  The pulley member 29 includes a pulley portion 29a, a cylindrical portion 29b, a guide convex portion 29c, a flange portion 29d, and the like. The pulley portion 29 a is engaged with the timing belt 30. A sleeve 38 is attached to the cylindrical portion 29b. The guide convex portion 29c is engaged with a pair of left and right guide grooves 39 formed at the lower end portion of the needle bar support 34 so as to be movable up and down, thereby moving the needle bar 33 and the needle bar support 34 relative to each other. forgive. The flange portion 29d is integrally formed in the vicinity of the upper end of the cylindrical portion 29b.

The main plate 21 a of the mounting frame 21 has a horizontal bracket 32. The bracket 32 has a circular hole 32a. The cylindrical portion 29b of the pulley member 29 and the bearing 40 are fitted in the circular hole 32a, and the pulley member 29 is rotatably supported by the bracket 32 via the flange portion 29d and the bearing 40. The bearing 40 is composed of an upper thrust bearing and a lower radial bearing.
The needle holder 23 can move up and down through relative movement of the pair of guide grooves 39 with respect to the pair of guide convex portions 29c. The needle holder 23 is transmitted from the pair of guide convex portions 29c to the pair of guide grooves 39 by the rotational driving force transmitted from the timing belt 30 to the pulley member 29, so that the needle holder 34 and the needle bar 33 are pivoted. It is rotationally driven around the center.

Next, the control system of the sewing machine 1 will be described.
As shown in FIG. 6, the control device 50 includes an input / output interface 51, a CPU 52, a ROM 53, a RAM 54, a flash memory 55, etc., a drive circuit 56-61, and the like. The input / output interface 51 is provided with an operation panel 62, a foot pedal 63, a spindle rotation angle signal generator 64 for generating a spindle rotation angle signal, a drive circuit 56 for the sewing machine motor 5, and a cloth feed mechanism. A drive circuit 57 for an X motor 66 that drives the feed base 12 in the X direction via the X direction drive mechanism and a feed base 12 in the Y direction via the Y direction drive mechanism provided in the cloth feed mechanism A drive circuit 58 for the Y motor 67, a drive circuit 59 for the cloth presser motor 19, an X direction origin sensor 68 provided in the X direction drive mechanism, and a Y direction origin provided in the Y direction drive mechanism. A sensor 69, a drive circuit 60 for the turning stepping motor 31, a turning origin sensor 70 for detecting the origin position of the turning stepping motor 31, and a drive for the lifting solenoid 27. Such circuit 61 is connected.

  An X encoder 66 a provided in the X motor 66, a Y encoder 67 a provided in the Y motor 67, and an N encoder 19 a provided in the cloth presser motor 19 are also connected to the input / output interface 51. The input / output interface 51 is also provided with a memory connector 51a to which an external storage medium 65 can be connected.

  The ROM 53 stores in advance a control program for sewing control for sewing a pattern based on work cloth feed data stored in an external storage medium, a control program for drilling control unique to the present application, which will be described later, and the like.

Next, drilling control executed when a pattern designated by a serie stitch-like stitch is sewn will be described with reference to the flowcharts of FIGS. However, Si (i = 1, 2, ...) in a figure shows each step.
When this control is started after a desired pattern is selected and the sewing needle 7 attached to the needle bar 6 is removed, first, a drilling data creation process (see FIG. 8) is executed in S1. Next, drilling data creation processing will be described with reference to FIG.

  First, in S20, all the work cloth feed data stored in the flash memory 55 is read into the memory of the RAM 54. FIG. 9 shows an example of work cloth feed data, where 0, 1, 2,... Are data numbers, and ST is identification data indicating stitch data. The work cloth feed data includes the work cloth feed amount in the X and Y directions as increment data, and includes intermittent presser foot height data that specifies the height of the presser foot 9, temporary stop data, and end data that supports the end of sewing. It is. FIG. 11 shows a pattern composed of serie stitch-like stitches sewn based on the work cloth feed data of FIG.

  Next, in S21, the sewing advance direction at each needle drop point and the turning angle of the punch needle 22 rotated about 45 ° clockwise (clockwise) with respect to the sewing advance direction are calculated. When calculating the sewing progress direction at each needle drop point, for example, a curve determined by each needle drop point and the two needle drop points before and after the needle drop point is obtained, and the tangential direction at each needle drop point of the curve is determined as the sewing progress direction. It is good. Alternatively, for example, a direction connecting two needle drop points before and after each needle drop point may be set as a sewing progress direction at each needle drop point.

  As shown in FIG. 4, for simplification of description, for example, an X, Y coordinate system is assumed in which the axis P of the needle bar 6 is the coordinate origin, and the sewing progress direction F in FIG. Suppose there is. In this case, when sewing in the + Y direction, the rotation angle (phase angle) of the piercing needle 22 may be in the state shown in FIG. 5B, but when sewing in the -Y direction, the piercing needle 22 is moved. It is necessary to rotate by −180 ° or + 180 ° from the state of FIG. The + rotation angle indicates clockwise rotation, and the-rotation angle indicates counterclockwise rotation. Further, when sewing in the + X direction, it is necessary to turn the piercing needle 22 by + 90 ° from the state of FIG. 5B, and when sewing in the −X direction, the piercing needle 22 is moved to FIG. ) To be rotated by -90 °.

  Next, in S22, correction is performed by adding the offset amount K shown in FIG. 4 to the leading work cloth feed data (see the leading data in FIG. 10), and in S23, the drilling process corrected in S22 is performed. A data table for punching processing including cloth feed data and rotation angle data of the punching needle is created and stored in the RAM 54. An example of the data table for drilling created from the workpiece feed data of FIG. 9 as described above is as shown in FIG. In the present embodiment, the offset amount K of the axis Q with respect to the axis P in FIG. 4 includes only the X direction component, but when the offset amount includes the Y component, the offset amount in the Y direction is also taken into account. Will be corrected.

  In FIG. 10, both the work cloth feed data in the X and Y directions and the data of the rotation angle θ of the punching needle 22 are described in increment data, and the X direction data of the first work cloth feed data is in the −X direction. The offset amount K is corrected. Therefore, when the cloth feed mechanism is driven based on the leading data to move the work cloth and the cloth presser member 14, the punching needle 22 of the punching device 20 coincides with the leading needle drop point, and the position A hole is to be drilled based on the 0th data.

  After completion of the drilling data creation processing of FIG. 8, the process proceeds to S2 of FIG. 7, where the counter N indicating the data number is set to “0” and the origin of the rotation stepping motor 31 is set. Is executed. In this case, the rotation stepping motor 31 is driven so that the detection signal from the rotation origin sensor 70 becomes an origin position at which the detection signal is at an “H” level, for example. After the origin is set, the rotation angle of the piercing needle 22 attached to the needle holder 23 is rotated about 45 ° clockwise with respect to the sewing progress direction F (+ Y direction) as shown in FIG. 5B. It becomes.

  Next, in S3, it is determined whether or not a drilling command has been input from the operation panel 62. When the determination is No, S3 is repeated, and when the determination is Yes, the sewing machine motor 5 is started. This is because the main shaft rotation angle signal generator 64 is operated by rotating the main shaft. Next, in S5, the Nth data (X, Y feed data and rotation angle data) designated by the counter N is read from the drilling data table.

  Next, in S6, it is determined whether or not the Nth data is data other than the work cloth feed data. When the determination is Yes, the process proceeds to S11. When the determination is temporary stop data (S11: Yes), the sewing machine motor 5 Stopped (S12), and then proceeds to S10. When the data is not paused data (S11: No), it is determined whether or not the data is end data (S13). When the determination is Yes, the control is terminated. When the data is not end data, the process proceeds to S10. After incrementing by "1", the process returns to S5.

  When the determination in S6 is No, the process proceeds to S7, where it is determined whether or not it is the feed start timing based on the signal from the spindle rotation angle signal generator 64. This feed start timing is assumed to be a predetermined time after the sewing needle 7 is raised above the needle plate 11 (for example, an appropriate time within the range of 310 to 360 ° in terms of the phase angle of the main shaft, assuming that the sewing is in progress). ). When the determination of S7 is No, S7 is repeated, and when the determination is Yes, the process proceeds to S8. In S8, the X and Y motors 66 and 67 are driven based on the X and Y feed data. In the next S9, the rotation stepping motor 31 is driven if necessary based on the rotation angle data of the punching needle 22, and the elevating solenoid 27 is driven downward to make the hole, and then in S10. The counter N is incremented by “1” and the process returns to S5.

  After completion of the drilling process for executing the control shown in FIGS. 7 and 8, the needle 7 is attached to the needle bar 6, and a plurality of needle drop holes are formed in the above-described drilling process in the sewing process. Pattern sewing is performed on the work cloth based on the work cloth feed data shown in FIG. In this way, a pattern composed of serie stitch-like stitches can be sewn neatly with high quality.

  FIG. 11 shows a result of sewing a laterally L-shaped pattern with serie stitch-like stitches based on the work cloth feed data of FIG. 9 as described above. Arrows a, b, and c indicate the direction of sewing progress. In FIG. 11, the origin P is the axis of the needle bar 6, and this pattern includes a stitch line B parallel to the X direction, a stitch line C parallel to the Y direction, and the upper end of the stitch line C. And a stitch line D extending in the −X direction. In any stitch line B, C, D, the needle drop hole A is oriented in a direction clockwise by about 45 ° with respect to the sewing progress direction, and the upper thread 72 falls to the left side of the lower thread 73 and lower thread. Perfect stitch rising from the right side of 73.

  Initially, at the origin P, the piercing needle 22 is in the state shown in FIG. As shown in FIGS. 10 and 11, at the start point of the stitch line B, the punch needle 22 is rotated 90 ° clockwise from the state of FIG. 5B, and the stitch is maintained while maintaining the rotation angle. Line B is sewn. At the starting point of the stitch line C, the piercing needle 22 is rotated by −90 ° (90 ° counterclockwise), and the stitch line C is sewn while maintaining the rotation angle. At the starting point of the stitch line D, the piercing needle 22 is rotated by −90 °, and the stitch line D is sewn while maintaining the rotation angle. As a result, M-shaped serie stitch-like stitches are formed beautifully in the sewing progress direction, and a high sewing product quality can be obtained.

  In the above example, for the sake of simplification of explanation, the explanation has been made on the assumption that the X, Y coordinate system as shown in FIG. 4 is used. However, before the control of FIGS. When the work cloth feed mechanism is operated via the control socket 0 to set the origin of the X and Y coordinate systems to a desired position and then the control shown in FIGS. 7 and 8 is started, the pattern to be sewn on the work cloth The position on the work cloth can be changed as appropriate.

The operation and effect of the sewing machine 1 described above will be described.
While the work cloth is fed independently in the X and Y directions by the work cloth feed mechanism, the needle holder 23 is rotated around its axis by the rotation drive mechanism 25 of the punching device 20 according to the change in the sewing progress direction. The needle holder 23 is moved up and down by the solenoid 27 to form a needle drop hole A in the work cloth, thereby forming a plurality of needle drop holes for forming a pattern made of serie stitch-like stitches on the work cloth. Can be formed. Therefore, since a plurality of needle drop holes A inclined clockwise by about 45 ° with respect to the sewing progress direction can be formed and sewn, the finish of the serie stitch-like stitches can be ordered and the quality of the sewing product can be improved. Can do.

  The needle drop hole A is a flat and slender hole, and the control device 50 controls the work cloth feed data so that the needle drop hole A faces in a direction inclined about 45 ° clockwise with respect to the sewing progress direction in a plan view. Since the rotation stepping motor 31 is controlled based on the above, even if the sewing progress direction changes, the needle drop hole A that is always inclined at a certain angle with respect to the sewing progress direction can be formed. In order to control the work cloth feed mechanism and the rotation stepping motor 31 based on the corrected work cloth feed data obtained by correcting the work cloth feed data using the offset amount K, a pattern set in the work cloth feed data is sewn. The plurality of needle drop holes A can be automatically formed.

  7 and FIG. 8, in the hole making process, the needle drop hole A for forming the stitch is formed so as to have a preset pattern while feeding the work cloth by the work cloth feeding mechanism, and then sewing is performed. In the process, since the work cloth is fed in the X and Y directions independently by the work cloth feed mechanism, the needle drop is formed in the needle drop hole A formed in the hole making process, and the serie stitch-like stitches are sewn. Using the punching needle 22 of the punching device 20 arranged at a position offset from the sewing needle 7, a needle drop hole A for forming a stitch is formed while feeding the work cloth by the work cloth feeding mechanism based on the work cloth feed data. It becomes possible to do.

  Next, the example which changed the said punching apparatus 20 is demonstrated. However, the same components as those of the punching device 20 according to the first embodiment are denoted by the same reference numerals, the description thereof is omitted, and different components are described. As shown in FIGS. 12 and 13, the lifting drive mechanism 24 </ b> A of the punching device 20 </ b> A includes a lifting motor 80 instead of the solenoid 27.

  The raising / lowering drive mechanism 24A includes a raising / lowering motor 80 having a lateral orientation similar to that of the sewing machine motor 5 and a needle bar crank 82 connected to an output shaft 81 of the raising / lowering motor 80. A needle bar crank 82 similar to the crank, a support 83 connected to the front end of the needle bar crank 82, a guide mechanism 84 for guiding the support 83 to move up and down in the vertical direction, and a needle holder 23 It has an engagement member 85 fixed to the upper end portion and supported by a support 83 so as to be rotatable about an axis. The elevating motor 80 is driven and controlled by the control device 50 so as to rotate at the same rotational speed as the sewing machine motor 5.

  The guide mechanism 84 includes a plate member 86 fixed to the mounting frame 21, a vertical guide groove 87 formed on the front surface of the plate member 86, and a piece member 88 engaged with the guide groove 87 so as to be movable up and down. It has. The piece member 88 is connected to the support member 83. An annular engagement groove 85 a is formed on the outer peripheral portion of the engagement member 85. A pair of front and rear roller members (not shown) attached to the lower end portion of the support 83 is engaged with the engagement groove 85a. The support member 83 supports the engagement member 85 so as to be rotatable about the axis of the needle holder 23 and to be able to transmit a lifting drive force.

  The raising / lowering driving mechanism 24 </ b> A is configured to drive the needle holder 23 up and down via the needle bar crank 82, the support member 83, and the engaging member 85 by the rotational driving force of the raising / lowering motor 80. In this case, the raising / lowering stroke of the needle holder 23 is the same as the raising / lowering stroke of the needle bar 6 for sewing provided in the arm portion 4, and the needle holder 23 is driven in synchronism with the needle bar 6 and in the same phase. Is done.

In addition, the structure of the rotation drive mechanism 25 is the same as that of the said Example. The front plate 21c and the rear plate 21e of the mounting frame 21 are formed with flange portions 21f and 21g. By fixing these flange portions 21f and 21g to the left side surface of the arm portion 4, the punching device 20A is provided with the arm portion. 4 is fixed.
The control of FIGS. 7 and 8 when drilling is performed by the drilling device 20A is substantially the same as in the above embodiment, but the lifting motor 80 is also activated when the sewing machine motor 5 is activated in S4 of FIG. . And after S19, in the period of the main axis phase angle of 90 to 270 °, the punching hole 22 is used to make the needle drop hole A in the work cloth.

Next, an example in which the above embodiment is partially changed will be described.
1) Instead of the lift drive mechanisms 24 and 24A, a mechanism that drives the needle holder 23 up and down via a rack and pinion mechanism by a stepping motor may be employed. Further, instead of the rotation drive mechanism 25, a mechanism for rotating the needle holder 23 via a gear train by a stepping motor may be employed.

1 is a perspective view of a sewing machine according to an embodiment of the present invention. It is a perspective view of a punching device. It is a principal part longitudinal cross-sectional view of a drilling apparatus. It is explanatory drawing explaining the offset amount of a punching apparatus. (A) is a side view of a piercing needle, (b) is an explanatory view of a needle drop hole and the direction of sewing progress. It is a block diagram of the control system of a sewing machine. It is a flowchart of drilling control. It is a flowchart of the data creation process for drilling in the control of FIG. It is explanatory drawing of work cloth feed data (sewing data). It is explanatory drawing of the data table for drilling. It is explanatory drawing which shows the example which sewed the pattern by the stitch of a serie stitch shape. It is a schematic perspective view of the drilling apparatus which concerns on Example 2. FIG. It is a perspective view of the drilling apparatus of FIG. It is FIG. 11 equivalent figure which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 4 Arm part 20 Hole punching device 22 Hole punching needle 23 Needle holder 24 Lifting drive mechanism 25 Turning drive mechanism 27 Solenoid 29 Pulley member 30 Timing belt 31 Turning stepping motor 50 Controller 80 Lifting motor 82 Needle bar crank A Needle pit

Claims (10)

In a sewing machine having a work cloth feeding means capable of holding a work cloth and feeding it independently in two different directions, and a control means for driving and controlling the work cloth feed means,
A needle holder for holding a piercing needle for forming a needle drop hole for forming a serie stitch-shaped stitch in the work cloth, a lifting drive means capable of moving the needle holder up and down, and the needle holder on its axis A sewing machine comprising: a sewing machine arm portion provided with a drilling device having a rotation driving means capable of rotating around a center.   2. The sewing machine according to claim 1, wherein the lifting / lowering driving means of the punching device includes an electric motor and a crank mechanism that is connected to an output shaft of the electric motor and lifts and lowers the needle holder.   The sewing machine according to claim 1, wherein the lifting / lowering driving means of the punching device has a solenoid capable of driving the needle holder up and down.   The rotation driving means of the hole punching device includes a pulley member that is inserted and guided so that the needle holder can be moved up and down and can transmit a rotational force to the needle holder, and a timing belt that is hung on the pulley member. The sewing machine according to claim 1, further comprising a stepping motor that rotationally drives the pulley member.   The said control means controls a work cloth feed means so that the pattern set to the work cloth feed data is sewn based on the work cloth feed data at the time of sewing. The described sewing machine.   The control means, when forming the needle drop hole, so as to form a plurality of needle drop holes for sewing a pattern set in the work cloth feed data based on the work cloth feed data, The sewing machine according to any one of claims 1 to 5, wherein the work cloth feeding means, the rotation driving means, and the elevation driving means are controlled. The needle drop hole is a flat and slender hole,
The said control means controls the said rotation drive means based on a work cloth feed data so that the said needle drop hole may face the direction inclined by the predetermined angle with respect to the sewing progress direction by planar view. Item 7. The sewing machine according to Item 6. The axis of the piercing needle held by the needle holder of the piercing device is arranged offset with respect to the axis of the needle bar in plan view,
The said control means controls the said work cloth feed means and the said rotation drive means based on the corrected work cloth feed data which corrected the said work cloth feed data using the offset amount of the said offset. 8. The sewing machine according to 7. By using a sewing machine having a work cloth feeding means capable of holding the work cloth and independently transferring it in two different directions and a control means for driving and controlling the work cloth feeding means, an arbitrary pattern can be formed with a serie stitch-like stitch. In the sewing method,
A hole forming step of forming a needle drop hole for forming a stitch so as to be a preset pattern while feeding the work cloth by the work cloth feeding means;
Next, a sewing step of sewing a serie stitch-shaped stitch while dropping a needle into the needle drop hole formed in the hole making step while feeding the work cloth by the work cloth feeding means,
A sewing method characterized by comprising: A needle holder for holding a vertical piercing needle for forming a needle drop hole for forming the serie stitch-shaped stitch; a rotation driving means capable of rotating the needle holder; and the needle holder. A drilling device provided with an elevating drive means capable of elevating and lowering is provided in the sewing machine arm portion in advance,
In the hole making step, a needle drop hole for forming a stitch is formed while controlling the work cloth feeding means, the lifting drive means, and the rotation drive means by the control means. 9. The sewing method according to 9.