JP2008307401A - Buttonholing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buttonholing machine capable of easily adjusting a balance of thickness of buttonhole stitches formed. <P>SOLUTION: In the buttonholing machine, a sewing mechanism and control of a feed table can form a buttonhole stitch of left and right zigzag stitches and back and front bar tacking stitches. In a program mode set by a select key 431, in a state that double-sewing of a parameter is selected by a program number key 421, a mode in which both the back and front bar tacking stitches and the left and right zigzag stitches are doubly sewn and a mode in which only the left and right zigzag stitches are doubly sewn can be switched by an up down key 411. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a hole formed on a work cloth, having a pair of zigzag stitches arranged across a button hole forming portion and a pair of seam stitches arranged at both ends of the zigzag stitches. It relates to a sewing machine.

  Conventionally, as this kind of hole sewing machine, a feed base for feeding a work cloth, a sewing means for forming a seam on the work cloth, and forming the button hole by controlling the feed base and the sewing means. And a sewing control means for forming a perforated seam having a pair of zigzag stitches arranged across the portion and a pair of tack seams arranged at both ends of the zigzag seam are considered. . In this perforated sewing machine, the sewing control means controls the feed base and the sewing means so that the work cloth can be fed while forming a seam on the work cloth. Overlock seam 70 (details will be described later) can be formed.

  However, in the case of a conventional hole sewing machine, for example, the sewing needle swing width (hereinafter also referred to as a staggered width) when sewing the left zigzag stitch 71 and the right zigzag stitch 72 is set to a fixed value in advance. I couldn't make fine settings. That is, in the conventional over-stitch sewing machine, although there was an idea that the overall size of the perforated seam 70 and the pitch of the seam can be set, the shape of the perforated seam 70 itself, the front / rear or left / right balance, etc. are set. It was not considered to be possible. For this reason, for example, the following problems have occurred.

  Normally, the stagger width is set to be equal on the left and right, but the actual stitch widths of the left zigzag stitch 71 and the right zigzag stitch 72 may look different depending on the tightening degree of the upper thread. However, in the case of these conventional hole-sewn sewing machines, the right and left balance cannot be corrected by adjustment in these cases. Similarly, even if the actual stitching lengths of the front tacking seam 73 and the back tacking seam 74 look different, this cannot be corrected.

  In addition, when this type of hole seam is formed on the work cloth, it is possible to perform so-called double stitching in which sewing is performed again in the vicinity of the portion where the sewing has been once performed so that the upper thread overlaps on the work cloth. is there. However, in the case of performing such double stitching in the conventional hole-sewn sewing machine, a second seam is formed at the same needle entry point as the position where the first seam is formed. There is a possibility that the upper thread forming the thread will be cut. Furthermore, when such double stitching is partially executed, the thickness varies depending on whether the double stitching is performed or not, but in the past, the pattern of the hole stitching was constant. It was also impossible to make adjustments according to the suitability of this change in thickness.

  Accordingly, an object of the present invention is to provide a hole sewing machine capable of easily adjusting the balance of the thickness of the formed hole seam.

  In order to achieve the above object, the present invention provides a feed base for feeding a work cloth, sewing means for forming a seam on the work cloth, and forming the button hole by controlling the feed base and the sewing means. A sewing machine comprising a pair of zigzag stitches disposed across the section and a sewing control means for forming a bouncing seam having a pair of tack seams disposed at both ends of the zigzag stitches. When the sewing control means causes the sewing means to double-sewing the hole seam, a mode in which both the seam stitches and the staggered seams are both double-sewn, and only each of the staggered seams is double-sewn. It is characterized by comprising switching means for switching between modes to be activated.

  In the present invention, the sewing control means controls the feed base and the sewing means, whereby a holed seam having a pair of staggered seams and a pair of tack seams can be formed. Further, when the sewing control means causes the sewing means to perform double stitching on the hole seam, the switching means performs only a mode in which both the seam stitches and the zigzag seams are both double stitched, and each zigzag seam. Switch to the mode for double stitching. For this reason, in this invention, the balance of the thickness of a zigzag stitch and a tack seam can be adjusted easily.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the appearance of a hole sewing machine M to which the present invention is applied. The hole sewing machine M according to the present embodiment forms a hole seam 70 (see FIG. 6) or the like on a work cloth (not shown) and cuts between the staggered seams 71 and 72 of the hole seam 70. This is a so-called buttonhole sewing machine for forming the buttonhole 80.

  As shown in FIG. 1, a hole sewing machine M is provided with a sewing machine motor 2, a pedal 3 for starting or stopping the sewing machine motor 2, a hole sewing seam 70, and a button hole 80. There are provided an operation panel 4 for inputting the various data and a control device 5 for controlling the driving of each part described later.

  The hole sewing machine M has a bed portion 6, a pedestal portion 7, and an arm portion 8, and, as shown in FIG. 2, a sewing mechanism 10 that forms a hole seam 70 on a work cloth, and a work cloth. The work cloth between the stagger stitches 71 and 72 of the feed base 11, the feed base drive mechanism 12 (see FIG. 3) that drives the feed base 11 in the cloth feed direction, and the hole stitches 70 of the work cloth is cut. A cutter 13 for forming the button hole 80 and a cutter driving mechanism 14 (see FIG. 4) for driving the cutter 13 up and down are provided.

  As shown in FIG. 2, the sewing mechanism 10 includes a needle bar 15 provided on the head 8 a of the arm unit 8, a sewing needle 16 that is detachably attached to the lower end of the needle bar 15, and the needle bar 15 being moved up and down. And a needle bar drive mechanism 17 (see FIG. 5) that reciprocates and swings left and right, and a hook (not shown) that is provided on the bed portion 6 and cooperates with the sewing needle 16 to form a hole seam. ing. Then, by driving the sewing mechanism 10 while feeding the work cloth with the feed base 11, for example, a hole seam 70 shown in FIG. 6 can be formed. As shown in FIG. 6, the hole seam 70 has a left zigzag seam 71 and a right zigzag seam 72, and further has a front tack seam 73 at the front end and a back tack seam at the rear end. 74 respectively. At the time of normal sewing, the seam is formed in the order of a part of the front tacking seam 73, the left zigzag stitch 71, the back tacking seam 74, the right zigzag stitch 72, and the remaining part of the front tacking seam 73. Further, the lengths A, B,... Shown in FIG. 6 are data set on the operation panel 4, and the setting method will be described in detail later.

  Next, the feed table 11 and the feed table drive mechanism 12 will be described. As shown in FIGS. 2 and 3, the feed base 11 is formed in a plate shape that is long in the front-rear direction, and a long hole 11 a for forming a hole seam 70 and a button hole 80 is formed in the front end portion thereof. . A pair of left and right guide plates 20 are fitted on the upper surface portion of the bed portion 6, and the feed base 11 is guided and supported between the guide plates 20 so as to be movable back and forth.

  The feed base drive mechanism 12 includes a movable member 21 fixed to the lower surface of the rear end portion of the feed base 11, a movable member 22 fixedly connected to the movable member 21 by a long connecting rod 23 in the front and rear directions, and a movable member 22. And a stepping motor 24 that is driven back and forth by a mechanism described below.

  The connecting rod 23 extends through the left end portion (back side in FIG. 3) of the movable members 21 and 22 and can move back and forth to the sewing machine frame via a pair of bearings 25 on both front and rear sides of the movable members 21 and 22. It is supported by the guide. A long rod 26 is fixedly provided on the right side of the connecting rod 23, and the right end portion of the movable member 22 is supported by the rod 26 so as to be movable back and forth through a bearing 22a.

  A driving pulley 27 is fixed to the output shaft of the stepping motor 24, and a driven pulley (not shown) is fixedly provided on the sewing machine frame behind the driving pulley 27, and an endless belt 28 is stretched around these pulleys. ing. When the aforementioned movable member 22 is fixed to a part of the belt 28 and the stepping motor 24 is driven, the feed base 11 is driven back and forth together with the movable members 22 and 21.

  By the way, the rear end portion of the presser arm 30 having the presser foot 31 attached to the front end portion thereof is connected to the movable member 22 so as to be rotatable about an axis in the left-right direction. The presser foot 31 is biased downward by a biasing member (not shown) via the presser arm 30, and the work presser 31 can press and fix the work cloth on the feed base 11. The cutter 13 is attached via a screw 41a to a cutter holder 41 at the lower end of a cutter attachment shaft 40 that is moved up and down by a cutter driving mechanism 14 described below.

  FIG. 4 is a perspective view illustrating the configuration of the cutter driving mechanism 14. As shown in FIG. 4, the cutter 13 is attached to the cutter mounting shaft 40 slightly behind the sewing needle 16 as described above, and this cutter mounting shaft 40 is attached to the plunger 45a of the cutter driving solenoid 45. It is connected via an operating arm 46 and the like. The cutter operating arm 46 is formed in a substantially L shape whose rear end is bent upward, and a central portion thereof is swingably supported on the sewing machine frame via a pivot shaft 46a extending in the left-right direction. The front end portion of the cutter operating arm 46 is connected to the cutter mounting shaft 40, and the rear upper end portion of the cutter operating arm 46 is connected via a link 47 to a plunger 45 a protruding rearward from the cutter driving solenoid 45. The front end portion of the cutter operating arm 46 is urged upward by a spring member 48.

  Therefore, the cutter 13 can be moved up and down via the cutter mounting shaft 40 by projecting / retracting the plunger 45a of the solenoid 45 for driving the cutter. The cutter driving solenoid 45 is a so-called bidirectional solenoid capable of driving the plunger 45a in the protruding direction and in the retracting direction according to the energized state. For this reason, the spring member 48 only needs to compensate for the weight of the mechanism from the cutter mounting shaft 40 to the cutter 13 and can be omitted.

  Next, FIG. 5 is a perspective view showing the configuration of the needle bar drive mechanism 17. As shown in FIG. 5, in the needle bar drive mechanism 17, the needle bar 15 is supported by a needle bar base 51 slidably provided on the arm portion 8 so as to be slidable in the vertical direction. Further, a needle bar holder 52 is fixed to the needle bar 15 at a predetermined position.

  On the other hand, the other end 53 b of the needle bar linkage 53 whose one end 53 a moves circularly along a circle C in the vertical plane is connected to the needle bar holder 52 via a square piece 54. A guide groove 52a having a rectangular cross-section in the left-right direction is formed on the side of the square bar 54 of the needle bar holder 52, and the square piece 54 engages with the guide groove 52a so as to be movable in the left-right direction. Further, a square piece 55 is provided on the opposite side of the other end 53 b of the needle bar linkage 53 from the side where the square piece 54 is provided. When the square piece 55 is engaged with the vertical groove 56a of the needle bar linkage guide 56, the other end 53b of the needle bar linkage 53 is guided to be movable only in the vertical direction. Further, a flat needle bar guide 57 is fixed to the side surface of the needle bar base 51. The needle bar guide 57 is formed with a long hole 57 a extending along the needle bar 15, and a protrusion 52 b protruding from the side surface of the needle bar holder 52 is engaged with the long hole 57 a. The tip of a swing lever 62 that swings integrally with the output shaft 61 a of the stepping motor 61 is connected to the lower end of the needle bar base 51 via a square piece 63.

  In the needle bar drive mechanism 17 configured as described above, the force applied to the needle bar linkage 53 from the upper shaft 64 that is rotationally driven by the sewing machine motor 2 is transmitted to the needle bar 15 via the square piece 54, thereby The needle bar 15 can be moved up and down. Further, the force applied from the stepping motor 61 to the swing lever 62 is transmitted to the needle bar base 51 via the square piece 63, whereby the needle bar 15 can be swung left and right. Then, by the cooperation of both of them, it is possible to execute the sewing of the above-described hole seam 70 and the like. Further, by controlling the swing width of the stepping motor 61, the width of each part of the hole seam 70 can be changed as will be described later.

  Subsequently, the configuration and control of the control system of the hole stitching machine M configured as described above will be described. As shown in FIG. 7, the control device 5 is constituted by a microcomputer having a CPU 5a, a ROM 5b, and a RAM 5c as main parts. 5d, a driving signal is output to the sewing machine motor 2, the stepping motor 24, the stepping motor 61, and the cutter driving solenoid 45 through a driving circuit (not shown), and a control signal such as a display state is also output to the operation panel 4. And an output interface 5e, which are connected by a bus 5f.

  Here, the configuration of the operation panel 4 and the method of using the same will be described with reference to FIG. As shown in FIG. 8, the operation panel 4 includes a display unit 410 including a 4-digit 7-segment display at the right end and a display unit 420 including a 2-digit 7-segment display at the left end. An LED 430 representing the current control mode of the overlock sewing machine M is provided.

  The numerical value displayed on the display unit 410 can be increased / decreased by the up / down key 411 and the numerical value after the increase / decrease can be determined by the enter key 413. The numerical value displayed on the display unit 420 can be cyclically changed by the program number key 421. Further, the hole sewing machine M has an automatic (AUTO) mode for performing normal sewing based on a program to be described later, and merely changes the needle drop point without actually dropping the sewing needle 16 and performing sewing. Test feed (TESTFEED) mode for confirming the sewing, manual (MANUAL) mode for the user to manually rotate the pulley (not shown), and a program (PROGRAM) for performing various settings related to the program to be described later ) Modes, and these modes are switched by a select key 431. In response to the switching of the mode, the LED 430 corresponding to the currently set mode is turned on.

  In addition, the operation panel 4 includes an LED 441 indicating that the power is turned on, an LED 443 indicating that some abnormality has occurred, a reset key 445 for resetting the hole sewing machine M after handling the abnormality, and a cutter. A cutter on key 447 for driving 13 without depending on a program is provided.

  When a mode other than the program mode is set, the control device 5 displays various messages on the display unit 410 and displays the number of the currently selected program on the display unit 420. In addition to a rectangular shape as shown in FIGS. 6 and 9A, a hole stitch sewing machine M has a dovetail shape in which one end swells in a circular shape as shown in FIG. 9B. As shown in Fig. 9 (C), it has a boat shape whose both ends are tapered and a round shape whose both ends are formed in a semicircular shape as shown in Fig. 9 (D). It corresponds. In the following description, a case will be described as an example where a rectangular hole stitch 70 is selected and the zigzag stitches 71 and 72 are not double stitched.

  When the user operates the program number key 421 to display the corresponding program number on the display unit 420 and then operates the select key 431 to set the program mode, the display unit 420 displays the parameter number corresponding to the program. Is displayed. The parameters corresponding to this program are composed of a first parameter corresponding to numbers 00 to 49 as shown in Table 1 and a second parameter corresponding to numbers 50 to 99 as shown in Table 2, and in the program mode. By operating the program number key 421, a desired parameter number can be displayed on the display unit 420, and the parameter can be set. For example, when the parameter number “00” is displayed on the display unit 420 in the perforated sewing machine M at the time of shipment, the initial value 3500 (spm) of the rotational speed is displayed on the display unit 410. This value can be changed with 100 spm as one step by operating the up / down key 411, and the settable range is 2000 to 4000 spm.

  When only the program number key 421 is operated, usually only the first parameter shown in Table 1 can be set, and when the second parameter shown in Table 2 is set (that is, the parameter number 50 to 50 on the display unit 420). 99), the enter key 413 and the program number key 421 are operated simultaneously. The first parameter is effective only for the program selected at that time, and is frequently changed. However, the second parameter is a parameter that is commonly used for all programs. Less frequently.

  Among the parameters shown in Table 1, the “staggered stitch length” of the number “01” represents the length of the staggered stitches 71 and 72 as shown by A in FIG. 6, and the “staggered pitch” of the number “02” is B The pitch of the zigzag stitches 71 and 72 as shown by, the “staggered width” of the number “03” is the width of the zigzag stitches 71 and 72 as shown by C, and the “fastening length” of the number “04” is D As shown by E, the length of the tack seams 73, 74, and the number "05", "Pinch pitch", as shown by E, the pitch of the tack seams 73, 74, the number "06", "Cutter space" Represents the interval between the staggered stitches 71 and 72 provided for the button hole 80 as indicated by F. Hereinafter, processing executed by the control device 5 based on the parameters set in this way will be described.

  When the user steps on the pedal 3 after setting the various parameters, the control device 5 executes the processing shown in the flowchart of FIG. As shown in FIG. 10, when the processing is started, the control device 5 first reads the set parameters in a predetermined area of the RAM 5c in S1 (S represents a step: the same applies hereinafter), and in S3, The needle drop point corresponding to the parameter is calculated. Next, in S5, the drive position of the cutter 13 corresponding to the parameter is calculated. In the perforated stitching machine M, the seam is formed in the order of a part of the front tacking seam 73, the left staggered stitch 71, the back tacking stitch 74, the right zigzag stitch 72, and the remaining part of the front tacking stitch 73. Therefore, the drive position of the cutter 13 is a predetermined position during or immediately after the formation of the right zigzag stitch 72.

  In subsequent S11, processing for forming a seam at each needle drop point calculated in S3 is executed. Specifically, the feed base 11 and the needle bar base 51 are driven while counting the number of stitches by the counter, and the needle bar 15 is moved up and down at a desired needle drop point. When the stitch for one stitch is formed, the process proceeds to the next S13. In S13, it is determined whether the right zigzag stitch forming the right zigzag stitch 72 is being executed. Since a part of the front tack-fastening seam 73 is initially formed, a negative determination is made and the process proceeds to S15. In S15, it is determined whether or not the sewing process has been completed, but initially a negative determination is made and the process returns to S11. In this way, the sewing is executed while repeating the processing of S11 to S15, and when the execution of the right zigzag sewing is started (S13: YES), the process proceeds to S17.

  In S17, it is determined whether or not the sewing has been completed up to the cutter driving position calculated in S5. If it is not the cutter driving position (S17: NO), the process proceeds to S15 as it is, and the sewing of the hole seam 70 is continued as described above, and when the sewing is completed to the cutter driving position (S17: YES), S19. Then, the cutter 13 is driven to form the button hole 80, and the process proceeds to S15. When the sewing of the hole seam 70 is finished in this way, an affirmative determination is made in S15 and the processing is finished. Through the above processing, the hole stitches 70 corresponding to the parameters set on the operation panel 4 can be formed.

  Next, the needle drop point calculation process in S3 will be described in detail with reference to FIGS. FIG. 11 is a flowchart showing in detail the process of S3. As shown in FIG. 11, when the process proceeds to S3, the control device 5 first creates the idle feed data to the sewing start position by the process of S30. As shown in FIG. 12, the control device 5 has an orthogonal coordinate system having an origin position (0, 0) at the center of the front end of the boring stitch 70, an X axis in the needle swinging direction, and a Y axis in the cloth feeding direction. Assumed. In S30, the coordinates of the sewing start position are calculated by the following equation based on the set value F of “Cutter space (06)” (the two-digit numerical value in parentheses represents the parameter number; the same applies hereinafter).

(X, Y) = (− F / 2, 0.2)
As a result, the movement path of the sewing needle 16 immediately before the start of sewing is as shown by a solid line in FIG. In subsequent S31, a needle drop point of the back stitch portion at the start of sewing is calculated.
For example, when “the number of front-stop stitches (10)” is set to 4, the needle drop points of the first to fifth stitches are calculated by the following formula.

1st stitch = (− F / 2−J1, 0.2)
Second stitch = (− F / 2, 0.2 + M)
3rd stitch = (− F / 2−J1, 0.2 + M)
4th stitch = (− F / 2, 0.2 + 2M)
5th stitch = (− F / 2−CL1 + 0.2, 0.2 + 2M)
However, J1 = “front stitching width (12)”
M = "Front backtacking pitch (13)"
CL1 = 2 × (“stagger width (03)” + “front tacking width correction (14)”)
× "Stagger width ratio (09)"
That is, while performing the sewing for “the number of front stitches (10)”, the swing width of the sewing needle 16 is set to J1, and then the front left stitch front width correction is added to the widths of the staggered stitches 71 and 72. The swing width is 0.2 mm smaller than the tacking width CL1. The remaining number of stitches N1 in the back stitching portion at the start of sewing is expressed by the following equation, and the swing width during the sewing for the number of stitches N1 is CL1-0.2.

N1≈2 × (D1-I1 × M / 2−0.2) / B (1)
However, I1 = “Number of front stitches (10)”
D1 = “Leading length (04)” + “Front tacking length correction (16)”
B = "Plover (02)"
Therefore, the actual pitch P1 at the sewing stitch at the start of sewing is
P1 = (D1-I1 * M / 2-0.2) / (N1 / 2)
The needle drop point after the 6th stitch in this part is
6th stitch = (− F / 2, 0.2 + 2M + P1)
7th stitch = (− F / 2−CL1 + 0.2, 0.2 + 2M + P1)
…………
I1 + N1 stitch = (− F / 2, D1)
It is represented by As a result, the movement path of the sewing needle 16 at the start sewing at the start of sewing becomes as shown by a solid line in FIG. In addition, in the first sewn portion at the start of sewing, the parameter needs to have a constraint that D1> I1 × M / 2−0.2 because the number of stitches N1 is calculated by the equation (1).

  In the subsequent S32, the needle drop point of the left zigzag stitch 71 (hereinafter also referred to as the “bound zigzag stitching portion”) is calculated. Here, the number of stitches N2 at the staggered stitching portion is expressed by the following equation, and the calculated needle drop point changes as follows depending on whether this is an even number or an odd number.

N2 ≒ 2 × A / B
However, A is a set value of “staggered stitch length (01)”, and the needle drop point in this case is calculated as follows.

[When the staggered stitch number N2 is an even number (for example, 10)]
1st stitch = (− F / 2−CL, P2 + D1)
Second stitch = (− F / 2, 2 × P2 + D1)
3rd stitch = (− F / 2−CL, 3 × P2 + D1)
4th stitch = (− F / 2, 4 × P2 + D1)
5th stitch = (− F / 2−CL, 5 × P2 + D1)
6th stitch = (− F / 2, 6 × P2 + D1)
7th stitch = (− F / 2−CL, 7 × P2 + D1)
8th stitch = (− F / 2, 8 × P2 + D1)
9th stitch = (− F / 2−CL, 9 × P2 + D1)
10th stitch = (− F / 2, 10 × P2 + D1)
[When the staggered stitch number N2 is an odd number (for example, 9)]
1st stitch = (− F / 2−CL, P2 + D1)
Second stitch = (− F / 2, 2 × P2 + D1)
3rd stitch = (− F / 2−CL, 3 × P2 + D1)
4th stitch = (− F / 2, 4 × P2 + D1)
5th stitch = (− F / 2−CL, 5 × P2 + D1)
6th stitch = (− F / 2, 6 × P2 + D1)
7th stitch = (− F / 2−CL, 7 × P2 + D1)
8th stitch = (− F / 2, 8 × P2 + D1)
9th stitch = (− F / 2−CL, 9 × P2 + D1)
10th stitch = (− F / 2, 9 × P2 + D1)
However, P2 = A / N2
CL = 2 x "stagger width (03)" x "stagger width ratio (09)" (2)
Therefore, 10 × P2 = A in the former case and 9 × P2 = A in the latter case. For this reason, the Y coordinate of the 10th stitch is A + D1 in the former case, and the Y coordinate of the 9th and 10th stitches is A + D1 in the latter case. As a result, the movement path of the sewing needle 16 at the outgoing staggered stitch portion is indicated by a solid line in FIG. 14A in the former case, and is indicated by a solid line in FIG. 14B in the latter case. .

  In subsequent S33, the needle drop point of the back tacking portion where the back tacking seam 74 is sewn backward is calculated. Here, the number of stitches N3 and the pitch P3 of the going back tack stop portion are expressed by the following equations.

N3≈2 × D2 / E P3 = D2 / (N3 / 2)
However, D2 = “sticking length (04)” + “back tacking length correction (17)”
E = “Pinch pitch (05)”
For example, when N3 = 8, the needle drop point is expressed by the following equation, and the movement path of the sewing needle 16 is shown by a solid line in FIG.

First stitch = (− F / 2−CL2, A + D1 + P3)
Second stitch = (− F / 2 + R × P, A + D1 + P3)
3rd stitch = (− F / 2−CL2, A + D1 + 2 × P3)
4th stitch = (− F / 2 + R × 2 × P, A + D1 + 2 × P3)
5th stitch = (− F / 2−CL2, A + D1 + 3 × P3)
6th stitch = (− F / 2 + R × 3 × P, A + D1 + 3 × P3)
7th stitch = (− F / 2−CL2, A + D1 + 4 × P3)
8th stitch = (− F / 2 + R × 4 × P, A + D1 + 4 × P3)
However, R = (CR2 + F) / D2
CL2 = 2 × (“plover width (03)” + “back anchor width correction (15)”)
× "Stagger width ratio (09)"
CR2 = 2 × (“plover width (03)” + “backstop width correction (15)”)
× (1- “Staggered width ratio (09)”)
Further, here, a restriction item of N3 ≧ 2 is required.

  In the subsequent S34, the needle drop point of the back tacking stop portion for sewing the back tacking seam 74 forward is calculated. Here, the number of stitches N4 and the pitch P4 of the returning back tack stop portion are expressed by the following equations in the same manner as the going back tack stop portion.

N4≈2 × D2 / E P4 = D2 / (N4 / 2)
The return back tacking portion changes the form of the needle drop point calculated depending on whether the staggered needle number N2 is an even number or an odd number. For example, when N2 = 10 (even number), the needle drop point is expressed by the following equation: The movement path of the sewing needle 16 is as shown by a solid line in FIG.

First stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−P4)
Second stitch = (CR2 + F / 2, A + D1 + D2 + 0.2−P4)
3rd stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−2 × P4)
4th stitch = (CR2 + F / 2, A + D1 + D2 + 0.2-2 × P4)
5th stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−3 × P4)
6th stitch = (CR2 + F / 2, A + D1 + D2 + 0.2-3 × P4)
7th stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−4 × P4)
8th stitch = (CR2 + F / 2, A + D1 + D2 + 0.2-4 × P4)
9th stitch = (F / 2, A + D1)
When N2 = 9 (odd number), the needle drop point is expressed by the following equation, and the movement path of the sewing needle 16 is as shown by a solid line in FIG.

First stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−P4)
Second stitch = (CR2 + F / 2, A + D1 + D2 + 0.2−P4)
3rd stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−2 × P4)
4th stitch = (CR2 + F / 2, A + D1 + D2 + 0.2-2 × P4)
5th stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−3 × P4)
6th stitch = (CR2 + F / 2, A + D1 + D2 + 0.2-3 × P4)
7th stitch = (− CL2−F / 2, A + D1 + D2 + 0.2−4 × P4)
8th stitch = (CR2 + F / 2, A + D1)
Here, in any case, a restriction item of N4 ≧ 2 is required.

  In subsequent S35, a needle drop point of the right zigzag stitch 72 (hereinafter also referred to as a return zigzag stitching portion) is calculated. Here, the number of stitches N5 and the pitch P5 of the return zigzag stitching portion are expressed by the following equations.

N5≈2 × A / B P5 = A / N5
The return zigzag stitching portion also changes the form of the needle drop point calculated depending on whether the number of stitches N5 is even or odd. For example, when N5 = 10 (even), the needle drop point is expressed by the following equation. The movement path of the sewing needle 16 is as shown by a solid line in FIG.

1st stitch = (F / 2 + CR, A + D1-P5)
Second stitch = (F / 2, A + D1-2 × P5)
3rd stitch = (F / 2 + CR, A + D1-3 × P5)
4th stitch = (F / 2, A + D1-4 × P5)
5th stitch = (F / 2 + CR, A + D1-5 × P5)
6th stitch = (F / 2, A + D1-6 × P5)
7th stitch = (F / 2 + CR, A + D1-7 × P5)
8th stitch = (F / 2, A + D1-8 × P5)
9th stitch = (F / 2 + CR, A + D1-9 × P5)
10th stitch = (F / 2, A + D1-10 × P5) = (F / 2, D1)
However, CR = 2 × “stagger width (03)” × (1− “stagger width ratio (09)”)
...... (3)
When N5 = 9 (odd number), the needle drop point is expressed by the following equation, and the movement path of the sewing needle 16 is shown by a solid line in FIG.

1st stitch = (F / 2, A + D1-P5)
Second stitch = (F / 2 + CR, A + D1-2 × P5)
3rd stitch = (F / 2, A + D1-3 × P5)
4th stitch = (F / 2 + CR, A + D1-4 × P5)
5th stitch = (F / 2, A + D1-5 × P5)
6th stitch = (F / 2 + CR, A + D1-6 × P5)
7th stitch = (F / 2, A + D1-7 × P5)
8th stitch = (F / 2 + CR, A + D1-8 × P5)
9th stitch = (F / 2, A + D1-9 × P5) = (F / 2, D1)
In the subsequent S36, the needle drop point of the front tacking seam 73 is calculated. Here, the number of stitches N6 and the pitch P6 of the front tacking seam 73 are expressed by the following equations.

N6≈2 × D1 / E P6 = D1 / (N6 / 2)
For example, when N6 = 9, the needle drop point is expressed by the following equation, and the movement path of the sewing needle 16 is as shown by a solid line in FIG.

1st stitch = (CR1 + F / 2, D1)
Second stitch = (− CL1−F / 2, D1)
3rd stitch = (CR1 + F / 2, D1-P6)
4th stitch = (-CL1-F / 2, D1-P6)
5th stitch = (CR1 + F / 2, D1-2 × P6)
6th stitch = (− CL1-F / 2, D1-2 × P6)
7th stitch = (CR1 + F / 2, D1-3 × P6)
8th stitch = (− CL1-F / 2, D1-3 × P6)
9th stitch = (CR1 + F / 2, 0)
However, CR1 = 2 × (“stagger width (03)” + “front tacking width correction (14)”)
× (1- “Staggered width ratio (09)”)
Further, here, a restriction item of N6 ≧ 2 is required.

In continuing S37, the needle drop point of the back stitching part at the end of sewing is calculated. Here, based on the set value I2 of the “number of back end sewing stitches (11)”, the needle drop point is calculated as follows.
(A) When I2 ≧ 2 In this case, the pitch P7 is calculated by the following equation.

P6 = (CL1 + F / 2) / (I2-1)
The needle drop point is expressed by the following equation. For example, when I2 = 3, the movement path of the sewing needle 16 is shown by a solid line in FIG. 19A. When I2 = 2, the movement of the sewing needle 16 is performed. The route is as shown by a solid line in FIG.

1st stitch = (0, 0)
Second stitch = (− P6, 0)
3rd stitch = (− 2 × P6, 0)
…………
In the case of I2 stitch = (− CL1-F / 2, 0) (B) I2 = 1 In this case, the needle drop point is expressed by the following equation, and the moving path of the sewing needle 16 is indicated by a solid line in FIG. It becomes like this.

First stitch = (− CL−F / 2, 0)
In subsequent S38, the needle drop point of the final needle is calculated. The needle drop point of this last needle is
(X, Y) = (0.5-CL1-F / 2, -0.2)
The movement path of the sewing needle 16 when reaching the final needle is as shown by a solid line in FIG. The needle drop point of the final needle is not a substantial seam when the lower thread and the upper thread are pulled downward by a well-known threading operation during the thread trimming operation. Further, in subsequent S39, idle feed data for moving the sewing needle 16 to the home position (0, 0) is created, and subsequently, in S40, finish data for instructing the end of sewing (S15) is created. After that, the process proceeds to S5 described above.

  If a value other than 0 is set in “Cutter X Position Correction (07)” or “Cutter Y Position Correction (08)”, the following processing is executed in S5. When “cutter Y position correction (08)” is set, the set value (mm) is converted into the number of stitches, and the drive timing of the cutter driving solenoid 45 is shifted according to the number of stitches. Thereby, the formation position of the button hole 80 can be shifted in the Y direction relative to the hole stitching 70. If “cutter X position correction (07)” is set, the set value is added to the movement amount of the first stitch of the sewing needle 16. As a result, the needle drop point calculated in S <b> 3 is shifted in the X direction as a whole, and the formation position of the button hole 80 can be shifted in the X direction relative to the hole seam 70.

  As described above, in the hole sewing machine M according to the present embodiment, the values of “stagger width (03)” and “stagger width ratio (09)” as shown in the above formulas (2) and (3). By setting as desired, the staggered width (CL, CR) of the staggered stitches 71, 72 can be individually set on the left and right. For this reason, the stagger width (CL, CR) can be individually set on the left and right sides to finely change the shape of the hole seam 70, and the left and right balance of the hole seam 70 can be adjusted accordingly.

  Further, in the perforated stitch machine M, by setting the “front tacking width correction (14)” and the “back tacking width correction (15)”, the stitch width as a whole of the pair of zigzag stitches 71 and 72 ( CL + F + CR) and the seam width (CL1 + F + CR1 or CL2 + F + CR2) of the tacking seams 73 and 74 can be set individually. For this reason, the shape of the hole seam 70 can be finely changed, and the balance of the width between the staggered seams 71 and 72 and the tack seams 73 and 74 can be adjusted. Moreover, in the perforated sewing machine M, the width of the front tacking seam 73 and the width of the back tacking seam 74 can be set individually, so that the balance can be adjusted more satisfactorily.

  Further, in the case of the sewing machine M, the lengths of the tacking stitches 73 and 74 are individually set by setting “front tacking length correction (16)” and “back tacking length correction (17)”. Can be set to For this reason, the shape of the hole seam 70 can be finely changed, and by extension, the balance before and after the hole seam 70 can be adjusted.

  Further, in the hole sewing machine M, as described above, a special hole seam 70 such as an eyelet shape, a boat shape, or a round shape can be formed by selecting a program number, and two zigzag stitches 71 and 72 are provided. Heavy stitching can also be performed. Therefore, it is possible to form the hole seam 70 having a more favorable decorative effect.

  Here, the process of S3 in the case of performing double stitching will be described. As a processing method for calculating a needle drop point for double stitching, there is a method of sequentially inserting a process similar to S35 and a process similar to S32 between the processes of S32 and S33 in FIG. There is also a method of executing the processing of S32 to S36 twice in succession. In the former method (type A), the zigzag stitches 71 and 72 are double stitched similarly to the tack stitches 73 and 74 that are preliminarily double stitched, and the hole stitching seam 70 has a uniform heavy thickness as a whole. . In the latter method (type B), the overall thickness of the hole seam 70 is doubled. In the hole stitch sewing machine M, when such double stitching is selected by setting the parameter number “20”, it is possible to select any of the above methods for performing double stitching.

  That is, in the hole sewing machine M, when the hole seam 70 is double-sewn, a mode in which only the zigzag seams 71 and 72 are double-sewn, and both the tack seams 73 and 74 and the zigzag seams 71 and 72 are 2 It is possible to switch to a mode in which heavy stitching is performed (in this case, the tack-fastening stitches 73 and 74 are substantially quadruple stitched). Accordingly, it is possible to easily adjust the balance in thickness between the staggered stitches 71 and 72 and the tack-fastening stitches 73 and 74 in the hole stitching seam 70.

  Furthermore, as shown in FIG. 13 and FIG. 18, in the hole sewing machine M, the needle drop point of the back stitching portion at the start of sewing calculated in S31 is set to the front tacking seam 73 calculated in S36. Arranged 0.2mm inside the needle entry point. For this reason, it is possible to satisfactorily prevent the upper thread that has already formed the seam from being cut during double stitching of the front tacking seam 73. It should be noted that, even when sewing the back anchor seam 74, the going needle drop point may be disposed 0.2 mm inside the return needle drop point. In this case, the upper thread can be more effectively prevented from being cut. However, the front tack-fastening seam 73 is provided with needle drop points at the start and end of sewing, so that there is a high possibility that an error will occur in the needle drop point where the seam is actually formed. In the perforated sewing machine M, the forward needle drop point is disposed 0.2 mm inside with respect to the front tacking seam 73, so that it is reliably prevented from overlapping the return needle drop point. The effect of preventing the cutting of the upper thread appears more remarkably.

  In the above embodiment, the sewing mechanism 10 corresponds to the sewing means, the control device 5 corresponds to the sewing control means, and the up / down key 411, the program number key 421, and the select key 431 correspond to the switching hand. Specifically, in the program mode selected by the select key 431, the configuration in which each mode is switched by the up / down key 411 in a state where the double stitching of the parameter 20 is selected by the program number key 421 corresponds to the switching hand.

  In addition, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist of the present invention. For example, program switching and setting of some parameters may be performed by a dip switch or the like. The needle drop point calculation process (S3) may be executed as a separate process independent of the seam formation process (S11), and the stitch formation process is performed while the needle drop point calculation process (S3) is being executed. (S11) may be executed. Further, when the needle drop point calculation process (S3) is executed as an independent process, it may be executed by a data creation device such as a personal computer separate from the main body of the hole stitching machine M.

It is a perspective view showing the appearance of a hole sewing machine to which the present invention is applied. It is a right view showing the principal part structure of the sewing mechanism of the sewing machine. It is a perspective view showing the structure of the feed stand drive mechanism of the said sewing machine. It is a perspective view showing the structure of the cutter drive mechanism of the said sewing machine. It is a perspective view showing the structure of the needle bar drive mechanism of the said sewing machine. It is explanatory drawing showing the structure of the hole seam which the said sewing machine forms. It is explanatory drawing showing the structure of the control system of the said sewing machine. It is explanatory drawing showing the structure of the operation panel of the said sewing machine. It is explanatory drawing showing the structure of the various modifications of the said hole stitch. It is a flowchart showing the process performed by the said control system. It is a flowchart showing the detail of the process of S3 in the process. It is explanatory drawing showing the movement path | route of the sewing needle just before a sewing start. It is explanatory drawing showing the movement path | route of the sewing needle in the sewing start. It is explanatory drawing showing the movement path | route of the sewing needle in the going staggered stitch part. It is explanatory drawing showing the movement path | route of the sewing needle in the going back tack stop part. It is explanatory drawing showing the movement path | route of the sewing needle in the return back tack stop part. It is explanatory drawing showing the movement path | route of the sewing needle in the return zigzag stitching part. It is explanatory drawing showing the movement path | route of the sewing needle in a front tacking seam. It is explanatory drawing showing the movement path | route of the sewing needle in the sewing end. It is explanatory drawing showing the movement path | route of the sewing needle to the last needle | hook.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Sewing motor 4 ... Operation panel 5 ... Control apparatus 10 ... Sewing mechanism 11 ... Feeding base 12 ... Feeding base drive mechanism 13 ... Cutter 14 ... Cutter driving mechanism 31 ... Work clamp 51 ... Needle bar base 70 ... Hole stitching stitch 71 ... Left staggered stitch 72 ... Right staggered stitch 73 ... Front tack-fastening stitch 74 ... Back tack-fastening stitch 80 ... Button hole 411 ... Up / down key 421 ... Program number key 431 ... Select key M ... Hole sewing machine

Claims (1)

A feed base for feeding the work cloth, a sewing means for forming a seam on the work cloth, and a pair of staggered stitches arranged so as to sandwich the button hole forming portion by controlling the feed base and the sewing means And a sewing machine having sewing control means for forming a sewing seam having a pair of tack seams arranged at both ends of the staggered seam,
When the sewing control means causes the sewing means to perform double stitching on the hole seam, a mode in which both the tacking seams and the staggered seams are both double stitched and only each of the staggered seams is double stitched. A hole-sewing sewing machine comprising switching means for switching between modes.

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