JP2013208403A - Buttonhole sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buttonhole sewing machine capable of preventing cutting of threads which have already formed stitches in a rear bar-tack portion and a front bar-tack portion, and capable of preventing a buttonhole from being formed in a small size.SOLUTION: When forming a buttonhole 65 by at least three times of downward movement of a cutter 13, a buttonhole sewing machine M stops sewing after forming buttonhole stitches 60 and moves down the cutter 13 to both end positions corresponding to the end part of the button hole 65 on the side of a front bar-tack portion 63 and the end part thereof on the side of a rear bar-tack portion 64, thereby forming the buttonhole 65.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole sewing machine, and more particularly to a hole sewing machine that forms a button hole by one or a plurality of cutter drops.

  The hole sewing machine has a cloth feeding means for feeding the work cloth, a sewing means for forming a hole seam on the work cloth, and a button hole forming means for cutting the work cloth to form a button hole. The hole sewing machine forms a hole seam with the cloth feeding means and the sewing means. The hole sewing machine lowers the cutter when forming a hole stitch, and cuts the inside of the hole stitch to form a cut hole (button hole).

  2. Description of the Related Art Conventionally, there is a perforated sewing machine in which a cutter is lowered continuously a plurality of times to form a button hole having a desired length in order to form a cut hole having a size larger than the blade span length of the cutter (for example, a patent Reference 1). The perforated sewing machine can form button holes of different lengths without changing the cutter.

JP 2000-24346 A

  In the hole sewing machine of Patent Document 1, when sewing a hole stitch formed by a pair of tacking portions and a pair of staggered portions, the cutter may be lowered while the staggered portion is being sewn. is there. For example, when the stitch pitch of the staggered portion is large, or when the number of rotations of the sewing machine motor is high, the work cloth is fed by cloth feed during a short time until the cutter descends from the standby position and cuts the work cloth. Move. Therefore, the accuracy of the lowered position of the cutter that forms the button hole is lowered in the hole sewing machine.

  If the accuracy of the lowering position of the cutter is lowered, the distance between the tacking portion and the cutting portion by the cutter is not stable, and the quality of sewing becomes unstable. In other words, the hole sewing machine has a problem in that the thread already formed in the tacking portion is cut (see FIGS. 11 and 13) or the size of the cut portion is reduced (see FIG. 12). It was.

  It is an object of the present invention to prevent a decrease in accuracy of the lowering position of the cutter, to prevent a thread that has already been formed with a seam in a barbed portion from being cut, and to prevent a buttonhole from being formed small. Is to provide.

  In order to achieve the above object, the first invention includes a cloth feeding means for feeding a work cloth, a sewing means for moving a sewing needle up and down to form a hole seam, and the cloth. The feed means and the sewing means are controlled so that a part of one tacking portion, the forward zigzag stitching portion, the other tacking stitching portion, the reverse zigzag stitching portion, and the one tacking stitching portion with respect to the work cloth Sewing control means for forming the hole stitches in the remaining order, button hole forming means having a cutter for cutting the work cloth to form button holes, and the sewing control means for the hole stitches. A button hole for controlling the button hole forming means so as to form the button hole by one or more descending operations of the cutter based on the length of the cutter and the length of the button hole. Forming control means, The button hole formation control means, when the button hole is formed by the lowering operation of the cutter three times or more, when the sewing control means stops sewing after forming the hole stitch, The cutter is lowered to both end positions corresponding to the one end portion of the button hole and the other end portion of the button hole, and the sewing control means forms the hole seam, The button hole forming means is controlled so as to form the button hole by lowering the cutter to an intermediate position between the both end positions of the button hole.

  When the buttonhole is formed by the descent operation of the cutter three or more times, the hole sewing machine according to the first invention of the present application stops sewing after forming the hole seam and stops one of the buttonholes of the buttonhole (front The cutter is lowered with respect to both end positions corresponding to the end portion on the side of the tacking portion) and the end portion on the other side of the tacking portion (rear tacking portion) to form a button hole. Therefore, when the hole sewing machine is lowered to one end of the bar clamp portion (front bar clamp portion) side and the other end of the bar clamp portion (rear bar clamp portion), the positional accuracy decreases. Can be prevented. Therefore, in the hole sewing machine, the lowering position of the cutter deviates from the predetermined position, and the seam has already been formed on the other tacking part (back tacking part) and one tacking part (front tacking part). By avoiding cutting a certain thread or forming a small button hole, the quality of sewing can be stabilized.

  According to a second aspect of the present invention, there is provided a perforated stitching machine according to the first aspect, further comprising a number-of-times determining means for determining the number of times the cutter is lowered based on the length of the cutter and the length of the button hole. The forming control means lowers the cutter when the number of times determining means determines that the number of times the lowering operation of the cutter is performed is one and the sewing control means stops sewing after forming the hole stitch. The button hole forming means is controlled so as to form the button hole, and the sewing control means determines that the hole sewing is performed when the number of times determining means determines that the number of times the cutter is lowered is two times. When the sewing is stopped after forming the eyes, the button hole forming means is controlled so as to form the button hole by lowering the cutter at the both end positions of the button hole, and the number of times judging means When the sewing control means determines that the number of lowering operations of the cutter is three times or more and the sewing control means stops sewing after forming the hole stitching stitch, the cutter is lowered to the both end positions of the button hole respectively. And the sewing control means controls the button hole forming means so as to form the button hole by lowering the cutter to the intermediate position of the button hole when forming the hole stitch. Features.

  In the overlock sewing machine according to the second invention of the present application, in the overlock sewing machine of the first invention of the present application, the number-of-times determining means for determining the number of times of lowering of the cutter determines that the number of times of lowering of the cutter is once or twice. When this is done, the sewing is stopped after forming the hole stitch, and the button hole is formed. Therefore, the hole sewing machine can prevent the positional accuracy from being lowered when the cutter is lowered. Therefore, in the hole sewing machine, the lowering position of the cutter is shifted from the predetermined position, and the thread that has already been formed with stitches in the back tacking part and the front tacking part is cut, or the button hole is made small. By avoiding this, it is possible to stabilize the sewing quality.

  According to the present invention, it is possible to prevent the accuracy of the lowered position of the cutter from being lowered, to cut the thread that has already been formed with seams in the back tacking part and the front tacking part, and to form a small button hole. Can be prevented.

It is a perspective view which shows the whole structure of a hole sewing machine. It is a side view which shows the principal part of the sewing mechanism of a hole sewing machine. It is a perspective view which shows the feed stand drive mechanism of a hole sewing machine. It is a side view which shows the principal part of the cutter drive mechanism of a hole sewing machine. It is a block diagram which shows the electrical structure of a hole sewing machine. It is a top view of a hole stitch. It is explanatory drawing of the parameter item set when forming a hole stitch. It is a flowchart of a cutter ON flag setting process to sewing data. It is a flowchart of a sewing process of a hole stitch. It is a flowchart of a sewing process of a hole stitch. It is explanatory drawing which shows the state which cut | disconnects the thread | yarn of the conventional back tack stop part. It is explanatory drawing which shows the state which forms the conventional buttonhole small. It is explanatory drawing which shows the state which will cut | disconnect the thread | yarn of the conventional front tack stop part.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the left diagonally lower side, the diagonally upper right side, the diagonally upper left side, and the diagonally lower right side of FIG. 1 are defined as the front, rear, leftward, and rightward sides of the sewing machine M, respectively.

  As shown in FIG. 1, the perforated sewing machine M includes a power button 9, a bed portion 6, a pedestal portion 7, an arm portion 8, a sewing machine motor 2, an operation panel 4 and a control device 5. Prepare. The power button 9 is disposed on the lower surface of the sewing machine table 1. The bed 6 is placed on the sewing machine table 1. The pedestal portion 7 is erected upward from the rear end portion of the bed portion 6. The arm portion 8 extends forward from the upper end portion of the pedestal column portion 7 so as to face the bed portion 6. The sewing machine motor 2 is provided below the bed portion 6 and is located on the lower surface of the sewing machine table 1. The sewing machine motor 2 rotates a main shaft (not shown). The operation panel 4 is provided on the sewing machine table 1. The control device 5 is provided below the sewing machine table 1. The sewing machine table 1 is provided with a pedal 3 below.

  As shown in FIG. 2, the arm portion 8 includes a needle bar 15, a cutter driving mechanism 14, and a sewing mechanism 18. The sewing mechanism 18 includes a needle bar drive mechanism (not shown), a needle swing mechanism (not shown), a balance drive mechanism (not shown), a thread tension device (not shown), a presser mechanism 30 and the like. The needle bar 15 is provided inside the front end of the arm portion 8 and includes a sewing needle 16 at the lower end. The needle bar drive mechanism transmits the driving force of the sewing machine motor 2 to the needle bar 15 via a main shaft (not shown), and drives the needle bar 15 up and down. The needle swinging mechanism swings the needle bar 15 left and right by the driving force of the needle swinging pulse motor 36 (see FIG. 5). The balance drive mechanism drives a balance (not shown) that pulls the upper thread (not shown) passed through the sewing needle 16 up and down. The thread tension device applies tension to the upper thread that reaches the sewing needle 16 through the balance. Since the needle bar drive mechanism, the needle swing mechanism, the balance drive mechanism, and the thread tension device are well-known techniques, detailed description thereof is omitted. The presser mechanism 30 includes a presser foot 31 that sandwiches the work cloth W with the feed base 11, a presser arm 32 that has the presser foot 31 attached below the front end portion, and the like.

  The cutter driving mechanism 14 lowers the cutter 13 after the formation of the hole seam 60 on the work cloth W, and cuts the inner side of the hole seam 60 of the work cloth W to form the button hole 65. Details of the cutter drive mechanism 14 will be described later (see FIG. 4).

  The perforated sewing machine M includes a rotary hook (not shown) inside the bed portion 6. The rotary hook is a vertical hook, and forms a hole seam 60 in the work cloth W in cooperation with the sewing needle 16 that moves up and down.

  The hole sewing machine M includes a feed base 11 and a feed base drive mechanism 12 (see FIG. 3). The feed base 11 is provided on the upper surface of the bed 6 and holds the work cloth W from above and below with the cloth presser 31. The feed base drive mechanism 12 is provided inside the bed portion 6 and can move the feed base 11 and the cloth presser 31 in the front-rear direction by using the cloth feed pulse motor 24 (see FIG. 3) as a drive source. The feed base drive mechanism 12 can move the work cloth W on the feed base 11 in the front-rear direction.

  With reference to FIG. 3, the feed base 11 and the feed base drive mechanism 12 are demonstrated. The feed base 11 has a plate shape that is long in the front-rear direction. The feed base 11 is located between a pair of left and right guide plates 20 fitted on the upper surface of the bed portion 6. The feed base 11 can move back and forth between the left and right guide plates 20. A long hole 11 a extending in the front-rear direction for forming the hole stitching seam 60 and the button hole 65 is provided at the front end of the feed base 11.

  The feed base drive mechanism 12 includes a pair of front and rear movable members 21 and 22, a connecting rod 23 extending in the front-rear direction for connecting the movable members 21 and 22, a cloth feed pulse motor 24, an endless timing belt 28, and the like. I have. The front movable member 21 fixes the lower surface of the rear end portion of the feed base 11. The connecting rod 23 extends in the front-rear direction through the left end portions (back side of the paper in FIG. 3) of the movable members 21 and 22. The connecting rod 23 is supported on the sewing machine frame via a pair of bearings 25 on both front and rear sides of the movable members 21 and 22. The connecting rod 23 can move back and forth. At the right end of the rear movable member 22, a guide rod 26 attached to the sewing machine frame is inserted through a bearing 22a. The rear movable member 22 is supported by a guide rod 26 so as to be movable in the front-rear direction. A guide rod 26 a attached to the lower surface of the right guide plate 20 is inserted through the right end portion of the front movable member 21. The front movable member 21 is supported by a guide rod 26a so as to be movable in the front-rear direction. The rear movable member 22 is rotatably attached to the rear end portion of the presser arm 32 of the presser mechanism 30.

  The cloth feed pulse motor 24 has a drive pulley 27 attached to an output shaft. Behind the drive pulley 27, a driven pulley (not shown) is attached to the sewing machine frame via a bearing (not shown). The timing belt 28 is stretched over the driving pulley 27 and the driven pulley, and the rear movable member 22 is fixed to the outer peripheral surface. In the feed base drive mechanism 12, the drive pulley 27 is rotated by driving the cloth feed pulse motor 24. With the rotation of the drive pulley 27, the feed base 11 moves in the front-rear direction together with the movable members 22 and 21.

  The cutter driving mechanism 14 will be described with reference to FIG. The cutter driving mechanism 14 includes an attachment shaft 40 to which the cutter 13 is attached, a solenoid (hereinafter simply referred to as “solenoid”) 45, an operating arm 46, a link 47, a spring member 48, and the like. The attachment shaft 40 extends in the vertical direction, and a holder 41 protruding forward is attached to the lower end. The cutter 13 is fixed to the front end portion of the holder 41 with a screw 41a. As shown in FIG. 2, the cutter 13 is located behind the sewing needle 16.

  The solenoid 45 is provided at the upper end portion of the arm portion 8. The solenoid 45 is a bidirectional solenoid capable of driving the plunger 45a in the protruding direction and the retracting direction according to the energized state. The plunger 45 a of the solenoid 45 projects forward of the solenoid 45 and is connected to the upper end portion of the operating arm 46. The operating arm 46 is formed in a substantially L shape in left side view extending downward from the upper end portion and bending forward at the center portion. The central portion of the operating arm 46 is swingably supported by the sewing machine frame via a support shaft 46a extending in the left-right direction. The solenoid 45 corresponds to the cutter driving means of the present invention.

  The front end portion of the operating arm 46 is connected to one end portion of the link 47. The link 47 can be rotated around the operating arm 46. The other end of the link 47 is pivotally connected to a substantially central portion in the vertical direction of the mounting shaft 40. The operating arm 46 is connected to the spring member 48 between the front end portion and the central portion. The spring member 48 urges the front part upward of the support shaft 46 a of the operating arm 46. The cutter 13 is biased upward by the spring member 48 via the operating arm 46 and the link 47, and is located at a predetermined cutting standby position indicated by a solid line in FIG.

  When the solenoid 45 is energized, the plunger 45a protrudes in the protruding direction. When the plunger 45a protrudes, the operating arm 46 rotates counterclockwise (in FIG. 4) about the support shaft 46a, and the mounting shaft 40 is lowered via the operating arm 46 and the link 47. The cutter 13 descends against the urging force of the spring member 48 from the cutting standby position, and moves to a lower cutting position indicated by a two-dot chain line in FIG. The cutter 13 cuts the inside of the hole seam 60 of the work cloth W (cutting operation) to form a button hole 65.

  When the energization to the solenoid 45 is stopped, the protruding plunger 45a is retracted. When the plunger 45a of the solenoid 45 is retracted, the operating arm 46 is rotated clockwise (in FIG. 4) about the support shaft 46a, and the mounting shaft 40 is raised through the operating arm 46 and the link 47. The cutter 13 moves upward (return operation) and is separated from the work cloth W.

  The spring member 48 only needs to compensate for the weight of the mechanism from the mounting shaft 40 to the cutter 13. When the solenoid 45 is in the non-driven state, the operator can manually lower the cutter 13 through the holder 41. The solenoid 45 may not be a bidirectional solenoid. The solenoid 45 only needs to lower the cutter 13 at least.

  The arm portion 8 includes an absorbing member 49 above the attachment shaft 40. The absorbing member 49 restricts and absorbs the return operation of the cutter 13 by the solenoid 45 at a predetermined position. The absorbing member 49 includes an adjustment screw 49a, a support screw (not shown), a contact piece 49d, and a compression spring 49e. The adjustment screw 49a is screwed into the arm portion 8 and fixed. The adjustment screw 49a has a hole (not shown) opened at the center of the lower end. The hole portion forms a screw portion (not shown) at the upper end portion. The support screw is fastened to the screw portion in the adjustment screw 49a from below, and the lower end supports the contact piece 49d. The contact piece 49d can contact the upper end 40a of the mounting shaft 40. The compression spring 49e is fitted to the support screw and is located in the hole of the adjustment screw 49a. The distance between the upper end 40a of the mounting shaft 40 and the contact piece 49d can be adjusted by an adjusting screw 49a.

  When the energization to the solenoid 45 is stopped, the mounting shaft 40 is raised. The upper end 40a of the mounting shaft 40 contacts the contact piece 49d. The contact piece 49d pushes up along the support screw while resisting the urging force of the compression spring 49e. The absorbing member 49 regulates and absorbs the rising of the mounting shaft 40, that is, the return operation of the cutter 13 by the urging force of the compression spring 49 e.

  With reference to FIG. 5, the electrical configuration of the control system of the hole stitching machine M will be described. The control device 5 includes a microcomputer mainly including a CPU 5a, ROM 5b, RAM 5c, and nonvolatile memory 5g, an input interface 5d, and an output interface 5e, which are connected by a bus 5f. The CPU 5a controls the hole stitching machine M, and executes various calculations and processes according to various programs stored in the ROM 5b.

  The ROM 5b prescribes drive control of various drive mechanisms, pattern selection control for selecting various patterns, control program for sewing control including various display controls, and shapes and sizes of the hole stitches 60 and the button holes 65. A setting processing program for setting a plurality of parameters, an arithmetic processing program for calculating sewing data (needle drop data), button hole data (cutter drop position data), and the like based on the plurality of parameters are stored.

  The RAM 5c temporarily stores various data input via the operation panel 4, various memories for storing calculation results obtained by the CPU 5a, pointers, counter values, and the like.

  The non-volatile memory 5g stores a plurality of parameters for defining the shapes and sizes of the hole stitches 60 and the button holes 65 set via the operation panel 4. Details of the parameters will be described later.

  The input interface 5d is electrically connected to the pedal position detection sensor 3a, the operation panel 4, and various origin sensors 101 to 103. The pedal position detection sensor 3 a outputs a signal corresponding to the operation state of the foot pedal 3. The output interface 5e is electrically connected to the sewing machine motor 2, the cloth feed pulse motor 24, the cloth presser pulse motor 35, the needle swing pulse motor 36, the drive circuits 70 to 75 for driving the solenoid 45, and the operation panel 4. Connected. The operation panel 4 includes keys for inputting various instructions and a display for displaying various information.

  The feed origin sensor 101 detects the origin of the cloth feed pulse motor 24. The presser foot origin sensor 102 detects the origin of the presser foot pulse motor 35. The needle bar horizontal swing origin sensor 103 detects the origin of the needle swing pulse motor 36. Each origin sensor is a known sensor such as a rotary encoder or an optical sensor provided in each stepping motor, for example. The nonvolatile memory 5g stores the origin positions detected by the origin sensors 101 to 103.

  As shown in FIG. 6, the hole seam 60 includes a forward zigzag portion 61, a return zigzag portion 62, a front tack stop portion 63, and a back tack stop portion 64. The hole stitch 60 is formed from the sewing start position indicated by reference numeral 66 and is completed at the sewing end position indicated by reference numeral 67. The hole seam 60 is formed by sewing in the order of a part of the front tacking portion 63, the forward staggered portion 61, the back tacking portion 64, the reverse staggered portion 62, and the remaining portion of the front tacking portion 63. To do. The broken line after the sewing end position 67 shown in the drawing indicates the path of the sewing needle 16 when the work cloth W is fed after the end of sewing.

  With reference to FIG. 7, parameter items set when forming the hole seam 60 will be described. In the drawing, a black line 68 represents a cutting position by the cutter 13, and shows a case where the button hole 65 is formed by cutting three times as an example. In FIG. 7, the black line 68 is shifted in the X direction (left and right direction) for the sake of explanation. The hole seam 60 is shown in a simplified manner.

  The plurality of parameters include a staggered stitch length A, a cutter dimension S, a front tacking length D1, a back tacking length D2, a front cutter space YE, and a back cutter space YS. The zigzag stitching length A is the length in the Y direction (vertical direction in FIG. 7) of the forward zigzag portion 61 and the return zigzag portion 62. The cutter dimension S is a dimension in the Y direction of the cutter 13. The front tacking length D1 is the length of the front tacking portion 63 in the Y direction. The backstop length D2 is the length of the backstop 64 in the Y direction. The front cutter space YE is the dimension in the Y direction of the gap between the front end position (lower side in FIG. 7) of the button hole 65 and the front tacking stop 63. The back cutter space YS is the dimension in the Y direction of the gap between the back end position (upper side in FIG. 7) of the button hole 65 and the back tacking stop 64. Each parameter can be set using the operation panel 4 based on the setting processing program. In this embodiment, the unit of each parameter is mm.

  The control device 5 (specifically, the CPU 5a) generates, as the sewing data (X, Y), the coordinate value (needle drop point) of the needle drop position of the sewing needle 16 that defines the sewing pattern based on the setting of the above parameters. . In each coordinate system of the sewing data (X, Y), the front side position of the front tacking portion 63 shown in FIG. The needle drop point includes stitch data that is a coordinate value that forms the hole seam 60, and feed data that is a coordinate value that moves the feed base 11. In the sewing data (X, Y), a cutter ON flag that is a lowering identifier for lowering the cutter 13 can be set. The sewing data (X, Y) is stored in the RAM 5c in association with the needle drop point and the cutter ON flag. The control device 5 instructs the cutter drive mechanism 14 to lower the cutter 13 based on the cutter ON flag at an appropriate needle drop point.

  In the example of FIG. 7, P1 to P3 are needle drop points where the cutter ON flag is set. P <b> 1 is the position of the sewing needle 16 when the work cloth W is fed after the end of sewing at the sewing end position 67. When the lowering instruction of the cutter 13 is given at P1, the cutting position 68 is a position having the cutting coordinate YMM [1] as the front end. P3 is the position of the sewing needle 16 when the work cloth W is fed after the cutter 13 is lowered at P1. When the lowering instruction of the cutter 13 is given at P3, the cutting position 68 is a position having the cutting coordinate YMM [3] as the front end. P <b> 2 is the position of the sewing needle 16 when the hole stitch 60 is formed. When the lowering instruction of the cutter 13 is given at P2, the cutting position 68 is a position having the cutting coordinate YMM [2] as the front end.

  With reference to FIG. 8, the process performed when the said cutter ON flag is set to sewing data is demonstrated. In the following description, the overlap amount between adjacent cutting positions when performing a plurality of cuttings is 2.0 mm or more, and the interval L (see FIG. 2) between the sewing needle 16 and the cutter 13 is 2.2 mm. To do. The overlap amount between adjacent cutting positions may be 1.0 mm or more. The process of FIG. 8 starts when sewing data (X, Y) is created.

  The CPU 5a calculates the cutting length HOL of the button hole 65 by A-YS-YE (S10). The CPU 5a initializes n with 1 in order to calculate the number of times of cutting n (S20).

The CPU 5a calculates the number of times of cutting n based on the cutting length HOL and the cutter dimension S. CPU5a sets n which satisfy | fills the following formula | equation to the frequency | count of cutting | disconnection (S30: YES), and transfers a process to S40. However, the dot in a formula represents multiplication.
HOL ≦ n · S-2 (n−1)
When the CPU 5a does not satisfy the equation (S30: NO), 1 is added to n (S35), and the determination of S30 is repeated.

  The CPU 5a determines whether or not the set cutting frequency n is 1 (S40). When the cutting number n is not 1 (S40: NO), the CPU 5a moves the process to S50. When the cutting number n is 1 (S40: YES), the CPU 5a moves the process to S45, and calculates the cutting coordinate YMM [1] and the cutter operation coordinate Y [1].

  The cutting coordinate YMM is the Y coordinate of the front end portion of the cutting position 68. The cutting coordinate YMM [1] is calculated as D1 + YE from the front tacking length D1 and the front cutter space YE. The cutter operation coordinate Y is a Y coordinate converted as a needle drop point coordinate to lower the cutter 13 to the cutting coordinate YMM. The cutter operation coordinate Y [1] is calculated by YMM [1] -2.2. 2.2 is the interval L. The calculated cutter operation coordinate Y [1] is the Y coordinate of P1. In P1, a cutter ON flag is set and added as feed data after the final stitch data of the needle drop point to the sewing data (X, Y). The CPU 5a ends the process.

  The CPU 5a determines whether or not the set number of cuts n is 2 (S50). When the cutting number n is 2 (S50: YES), the CPU 5a moves the process to S55, and calculates cutting coordinates YMM [1], YMM [2] and cutter operation coordinates Y [1], Y [2]. .

  The cutting coordinate YMM [2] is the Y coordinate of the front end portion on the front tacking portion 63 side among the two cutting positions 68. The cutting coordinate YMM [2] is calculated by D1 + YE. The cutting coordinate YMM [1] is the Y coordinate of the front end portion of the two cutting positions 68 on the rear tacking portion 64 side. The cutting coordinate YMM [1] is calculated from the front tacking length D1, the staggered stitching length A, the back cutter space YS, and the cutter dimension S as D1 + A−YS−S. The cutter operation coordinate Y [2] is calculated by YMM [2] -2.2. The cutter operation coordinate Y [1] is calculated by YMM [1] -2.2. The calculated cutter operation coordinates Y [1] and Y [2] are the Y coordinates of P1 and P2. P1 and P2 are set in the order of P1 and P2 by setting a cutter ON flag as feed data after the final stitch data of the needle drop point in the sewing data (X and Y). The CPU 5a ends the process.

  When the cutting number n is not 2 (S50: NO), the cutting number n is 3 or more. The CPU 5a shifts the processing to S60 and S65, and calculates cutting coordinates YMM [1] to YMM [n] and cutter operation coordinates Y [1] to Y [n]. In S60, the CPU 5a calculates cutting coordinates YMM [1], YMM [n] and cutter operation coordinates Y [1], Y [n].

  The cutting coordinate YMM [n] is the Y coordinate of the front end portion closest to the front tacking portion 63 among the n cutting positions 68. The cutting coordinate YMM [n] is calculated by D1 + YE. The cutting coordinate YMM [1] is the Y coordinate of the front end portion closest to the rear tacking portion 64 among the n cutting positions 68. The cutting coordinate YMM [1] is calculated by D1 + A−YS−S. The cutter operation coordinate Y [n] is calculated by YMM [n] −2.2. The cutter operation coordinate Y [1] is calculated by YMM [1] -2.2. The calculated cutter operation coordinates Y [1] and Y [n] are the Y coordinates of P1 and Pn. P1 and Pn are set in the order of P1 and Pn by setting a cutter ON flag as feed data after the final stitch data of the needle drop point in the sewing data (X and Y).

In S65, the CPU 5a calculates cutting coordinates YMM [2] to YMM [n-1] and cutter operation coordinates Y [2] to Y [n-1]. The cutting coordinates YMM [2] to YMM [n−1] are calculated by equally dividing the cutting coordinates YMM [1] and YMM [n], respectively. For example, the cutting coordinate YMM [2] is calculated by the following formula.
YMM [2] = YMM [1] + (YMM [n] −YMM [1]) / (n−1)
The cutter operation coordinates Y [2] to Y [n-1] are calculated by subtracting 2.2 from the calculated cutting coordinates YMM [2] to YMM [n-1]. The CPU 5a compares the calculated cutter operation coordinates Y [2] to Y [n-1] with stitch data at the needle entry point. The CPU 5a selects the stitch data at the needle entry point closest to each cutter operation coordinate Y [2] to Y [n-1], and sets the cutter ON flag in the sewing data (X, Y) as P2 to Pn-1. To do. The CPU 5a ends the process.

  Next, with reference to FIGS. 9 and 10, the sewing process for the hole stitch 60 will be described. The sewing process starts when the operator inputs sewing start by operating the foot pedal 3 or the like.

  The CPU 5 a outputs a control signal to the drive circuit 71 to drive the feed cloth feed pulse motor 24 and outputs a control signal to the drive circuit 73 to drive the needle swing pulse motor 36. The hole sewing machine M moves the sewing needle 16 to a position corresponding to the sewing start position 66 of the workpiece cloth W by feeding the workpiece cloth W and swinging the needle bar 15 (S105).

  The CPU 5a outputs a start signal to the drive circuit 70 to start the sewing machine motor 2 (S115). The CPU 5a reads the sewing data corresponding to the first data address (S125). At the time of this data reading, the data address is advanced to facilitate the next reading.

  The CPU 5a determines whether or not the cutter ON flag is set in the sewing data read in S125 (S135). When the cutter ON flag is set (S135: YES), the CPU 5a outputs a lowering command signal for the cutter 13 to the drive circuit 75 (S140). The plunger 45a of the solenoid 45 projects forward, and the cutter 13 descends to cut the work cloth W on the feed base 11. When the cutter ON flag is not set in the sewing data read in S125 (S135: NO), the CPU 5a moves the process to S145.

  The CPU 5a determines whether or not the sewing data read in S125 is the sewing machine stop data corresponding to the stop of the sewing machine motor 2 (S145). If it is sewing stop data (S145: YES), the CPU 5a outputs a stop signal to the drive circuit 70 to stop the sewing machine motor 2 (S150). The CPU 5a moves the process to S205 (see FIG. 10). When it is not the sewing machine stop data (S145: NO), the CPU 5a moves the process to S155.

  The CPU 5a determines whether or not the sewing data read in S125 is stitch data (S155). If it is not stitch data (S155: NO), the CPU 5a shifts the process to S175 described later. If it is stitch data (S155: YES), the CPU 5a performs sewing for one stitch and determines whether or not a predetermined cloth feed timing has come (S165). The CPU 5a waits until a predetermined cloth feed timing is reached (S165: NO, S165). When the predetermined cloth feed timing is reached (S165: YES), the CPU 5a moves the process to S175.

  The CPU 5a outputs a control signal to the drive circuit 71 to drive the feed cloth feed pulse motor 24, and outputs a control signal to the drive circuit 73 to drive the needle swing pulse motor 36 (S175). The perforated sewing machine M feeds the work cloth W by one needle and swings the needle bar 15. The CPU 5a returns the process to S125 and repeats the processes of S125 to S175.

  As shown in FIG. 10, when the sewing machine motor 2 is stopped in S150, the CPU 5a reads sewing data corresponding to the current data address (S205). The CPU 5a determines whether or not the sewing data read in S205 is end data indicating the end of sewing (S215). When it is end data (S215: YES), CPU5a complete | finishes a process. If it is not end data (S215: NO), the CPU 5a outputs a control signal to the drive circuit 71 to drive the feed cloth feed pulse motor 24, and outputs a control signal to the drive circuit 73 to output the needle swing pulse. The motor 36 is driven (S225). The perforated sewing machine M feeds the work cloth W by one needle and swings the needle bar 15.

  The CPU 5a determines whether or not the cutter ON flag is set in the sewing data read in S205 (S235). When the cutter ON flag is not set (S235: NO), the CPU 5a returns the process to S205. When the cutter ON flag is set (S235: YES), the CPU 5a outputs a lowering command signal for the cutter 13 to the drive circuit 75 (S240). The plunger 45a of the solenoid 45 projects forward, and the cutter 13 descends to cut the work cloth W on the feed base 11. The CPU 5a returns the process to S205 and repeats the processes of S205 to S240.

  In the example shown in FIG. 7, when the hole sewing machine M starts sewing, the sewing needle 16 is moved to the sewing start position 66 of the work cloth W (S105), and the sewing machine motor 2 is started (S115). Based on a plurality of read sewing data, the hole sewing machine M is a part of the front tacking part 63, the forward staggered part 61, the back tacking part 64, the reverse staggered part 62, and the remaining parts of the front tacking part 63. Sewing is performed in order to form a corresponding hole stitch 60. At this time, since the cutter ON flag is set in the sewing data P2 read at the time of sewing the front tack stop portion 63 (S135: YES), the hole sewing machine M descends the cutter 13 and moves the cover on the feed base 11. The work cloth W is cut (S140).

  After sewing the front tacking stop 63, the sewing machine motor 2 stops based on the sewing machine stop data (S145: YES, S150). Since the cutter ON flag is set in the sewing data P1 read after the sewing machine motor 2 is stopped (S235: YES), the hole sewing machine M lowers the cutter 13 and executes the second cutting (S240).

  Next, since the next cutter ON flag is set to the read sewing data P3 (S235: YES), the hole sewing machine M descends the cutter 13 and executes the third cutting (S240). The hole sewing machine M ends the process according to the end data (S215: YES). Accordingly, the sewing machine M is provided with the sewing machine motor 2 after forming the sewing stitch 60 on the front and rear fastening parts 63 side (corresponding to P3 and P1) of the three cutting positions 68. The cutter 13 is lowered after stopping, and the cutter 13 is lowered when the hole seam 60 is formed except for the front tacking portion 63 side and the rear tacking portion 64 side (corresponding to P2).

  When the number of times of cutting n is 3 or more, the hole sewing machine M according to the present embodiment described above has both ends of the cutting position 68 on the front tacking portion 63 side and the rear tacking fastening portion 64 side. The cutter ON flag is set as feed data after the final stitch data at the needle drop point, and the data other than both ends is set as the sewing data in which the cutter ON flag is set to the stitch data at the needle drop point. That is, the hole sewing machine M is configured so that the cutter 13 is lowered after the sewing machine motor 2 is stopped after the formation of the hole seam 60 at both ends of the front and rear tacking portions 63 and 64. Otherwise, the cutter 13 is lowered when the hole seam 60 is formed. Therefore, when the cutter 13 is lowered to the cutting positions 68 on both ends of the front and rear tacking portions 63 and 64, the position accuracy can be prevented from being lowered. Accordingly, the hole sewing machine M prevents the thread that has already been formed with seams in the back tack stop portion 64 and the front tack stop portion 63 and prevents the button hole 65 from being formed in a small size. Stabilization of the stitching quality of the seam 60 can be achieved.

  When the number of cuts n is 1, the hole sewing machine M sets a cutter ON flag as feed data after the last stitch data at the needle drop point. When the number of times of cutting n is 2, the hole-sewn sewing machine M uses both ends of the front and rear tacking parts 63 and 64 as cutters as feed data after the final stitch data of the needle drop points. Set the ON flag. That is, when the number of times of cutting n is 1 or 2 times, the hole sewing machine M lowers the cutter 13 after the sewing machine motor 2 stops after the formation of the hole seam 60. Therefore, when the cutter 13 is lowered to the cutting position 68, the position accuracy can be prevented from being lowered. Accordingly, the hole sewing machine M prevents the thread that has already been formed with seams in the back tack stop portion 64 and the front tack stop portion 63 and prevents the button hole 65 from being formed in a small size. Stabilization of the stitching quality of the seam 60 can be achieved.

  The feed base drive mechanism 12 corresponds to the “cloth feed means” of the present invention. The sewing mechanism 18 corresponds to the “sewing means” of the present invention. The CPU 5a that executes the sewing process of the stitched seam shown in FIGS. 9 and 10 corresponds to the “sewing control means” of the present invention. The cutter driving mechanism 14 corresponds to “button hole forming means” of the present invention. The CPU 5a that executes the processes of S140 and S240 corresponds to the “button hole formation control means” of the present invention. The CPU 5a that executes the processes of S40 and S50 corresponds to the “number of times determination means” of the present invention.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit and technical idea of the present invention. For example, the present invention can be similarly applied to the case where the button hole is formed by the lowering operation of the cutter 13 four times or more.

5 Control device 12 Feed stand drive mechanism (cloth feed means)
13 Cutter 18 Sewing mechanism (sewing means)
32 Sewing needle 60 Hole stitching 61 Outward staggered portion 62 Returned staggered portion 63 Front tack stop portion 64 Back tack stop portion 65 Button hole M Hole stitching sewing machine

Claims (2)

Cloth feeding means for feeding the work cloth;
Sewing means for moving a sewing needle up and down to form a holed seam in the work cloth;
By controlling the cloth feeding means and the sewing means, a part of one tack-fastening part, a forward zigzag stitching part, the other tack-fastening part, a reverse zigzag stitching part, and the one tack Sewing control means for forming the hole stitches in the remaining order of the stoppers;
Button hole forming means having a cutter for cutting the workpiece cloth to form a button hole;
When the sewing control means forms the hole stitch, the button hole is formed by one or a plurality of descending operations of the cutter based on the length of the cutter and the length of the button hole. Button hole forming control means for controlling the button hole forming means;
In the hole sewing machine with
The button hole formation control means includes:
When the button hole is formed by the lowering operation of the cutter three times or more, when the sewing control means stops sewing after forming the hole stitching seam, the one end of the button hole on the side of the one tacking portion And when the sewing control means forms the hole seam, the intermediate between the both end positions of the button hole is lowered. The hole-sewing sewing machine characterized by controlling the button hole forming means so as to form the button hole by lowering the cutter at each position. A number-of-times judging means for judging the number of times the cutter is lowered based on the length of the cutter and the length of the button hole;
The button hole formation control means includes:
In a case where the number determining means determines that the number of times of lowering operation of the cutter is one, when the sewing control means stops sewing after forming the hole stitch, the button hole is lowered and the button hole is lowered. Controlling the buttonhole forming means to form
When the number determining means determines that the number of times the cutter is lowered is two, when the sewing control means stops sewing after forming the hole stitch, the button hole is respectively positioned at the both end positions. Controlling the button hole forming means to lower the cutter to form the button hole;
When the number determining means determines that the number of lowering operations of the cutter is three times or more, when the sewing control means stops sewing after forming the hole seam, the button hole is positioned at the both end positions. The button hole forming means is configured to lower the cutter and form the button hole by lowering the cutter to the intermediate position of the button hole when the sewing control means forms the hole stitch. The hole sewing machine according to claim 1, wherein the sewing machine is controlled.

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