KR100402537B1 - Buttonhole sewing machine - Google Patents

Abstract

An object of the present invention is a buttonhole sewing machine which does not expose the cutting edges formed on the material upon cutting by the cloth cutting blade, and eliminates unnecessary overlapping stitches to provide a double stitching pattern with a wide variety of improved appearance. To provide.

The sewing machine includes sewing means for stitching the outer periphery of the buttonhole on the material, a cloth cutting blade for cutting the buttonhole on the material, and the control means, wherein the control means includes two rounds of the outer periphery of the buttonhole. The stitching has a cross stitch function for making the first round sewing path across the second round sewing path by moving the knitting needle drop positions of the first round sewing and the second round sewing with respect to each other.

Description

Buttonhole Sewing Machine {BUTTONHOLE SEWING MACHINE}

The present invention relates to a buttonhole sewing machine, in particular a buttonhole sewing machine for stitching around the outer circumference of the buttonhole portion on the material.

Buttonhole sewing machines for stitching around the outer periphery of buttonhole portions on materials or fabrics have been improved from the past.

The buttonhole sewing machine has a cloth supply means for moving the cloth back and forth in the Y-direction, a knitting needle swing means for swinging the knitting needle in the X-direction, and a cloth for cutting the cloth by dropping the fabric cutting blade into the button hole on the cloth. Cutting means. This sewing machine manufactures a buttonhole by stitching the outer periphery of the buttonhole portion by the cooperation of the cloth air attack means and the knitting needle swing means, and cutting the buttonhole portion with a cloth cutting blade operated during stitching.

As shown in FIG. 26, a buttonhole sewing machine (hereinafter referred to as "sewing machine") generally has a left parallel portion A, a first bartacking section B, a right parallel portion C, and The circumference | surroundings of the 2nd bartacking part D are stitched. When this stitching is almost finished (for example, when the stitching of the right parallel part C is almost finished), a button hole is made by the cloth cutting blade descending above the buttonhole part F. FIG.

"Double stitching" patterns are known as one of the sewing patterns made by conventional buttonhole concealers. This conventional double stitching pattern is made by simply sewing the periphery of the aforementioned stitching portions A, B, C, and D twice and repeating stitches at the same point.

Since a conventional sewing machine cuts the buttonhole just before the buttonhole pattern is completely formed, the cutting edge portion E (see FIG. 26) of the fabric made by the cutting blade is not sewn on the inside of the stitch and exposed on the outside of the stitch. The appearance is not good.

In order to solve this problem, a method of cutting the buttonhole is known before sewing the outer periphery of the buttonhole. However, this method also has the disadvantage of making the appearance poor. Because the cutting edge portions are shaken when the fabric with the unsewn buttonholes is stitched, it often causes stitch skips or loose sutures.

In a conventional sewing machine, the stitch density of the bartacking portion is generally higher than that of the parallel portion. However, known double stitching patterns are made of overlapping stitches in parallel as well as bartacking portions. Therefore, the stitch density in the bartacking portion becomes so high that excessive swelling is formed, making the appearance of the sewn product poor and lowering the price. Furthermore, because the needle descends over excessively dense areas, the vertical movement of the needle causes the yarn to wear and often break.

In order to solve these problems, it is an object of the present invention to provide a buttonhole sewing machine which can improve the appearance of the seam without exposing the cutting edge portion at the time of cutting by the cloth cutting blade. It is another object of the present invention to provide a controller for buttonhole sewing machines which can obtain a wide variety of improved appearance of the double stitching pattern which eliminates unnecessary overlapping stitches.

1 is a perspective view of a buttonhole sewing machine according to the present invention.

Figure 2 is a perspective view schematically showing a cloth feeder and knitting needle lifter of the present sewing machine.

Figure 3 is a perspective view schematically showing a needle lift and needle swing machine of the present sewing machine.

4 is a front view of the knitting needle swing viewed from the knitting needle side;

5 is a representative view of a single needle swing for explaining the operation of the needle needle swing.

6 is a view showing a series of operations of the single needle swing, Figure 6a is a state diagram of a single needle swing with the cam upper end of the single needle swing cam on the reference line side, and Figure 6b is a cam upper end on the cam swing width side State of single needle swing which is put on.

7 is a change in the baseline position performed by the single needle swing.

8 is a change diagram of a swing width position executed by a single needle swinger;

9 is a perspective view of cloth cutting means for operating a cloth cutting blade;

10 is a front view of the operation panel mounted on the sewing machine.

11 is a block diagram of a circuit configuration of the present sewing machine.

12 is a table showing items input from an operation panel.

FIG. 13 is a table showing length variables of respective portions of one sewing pattern. FIG.

FIG. 14 shows a series of sewing patterns for sewing sequences 1 to 7 of double stitching suitable for the cross stitch function.

FIG. 15 shows a series of sewing patterns for the sewing sequences 8-14 following FIG. 14;

16 is a schematic diagram of a process sequence executed by the controller of the present sewing machine.

17 is a schematic diagram of a subroutine for the sewing data generation process in the general flow of FIG.

18 is a schematic diagram of a subroutine for the pattern calculation process in the sewing data generation process of FIG.

FIG. 19 is a schematic diagram of calculation process A in the pattern calculation subroutine of FIG. 18; FIG.

20 is a schematic diagram of calculation process B in the pattern calculation subroutine of FIG.

21 is a schematic diagram of a calculation process C in the pattern calculation subroutine of FIG. 18.

22 is a schematic diagram of a subroutine for calculating the blade drive time in the sewing data generation subroutine of FIG.

FIG. 23 is a diagram for explaining the blade drive stitch number Mn variable used in the blade drive time calculation subroutine of FIG.

24 is a schematic diagram of a subroutine for the sewing process in the general flow of FIG.

25 is a system diagram of another embodiment of a buttonhole treatment process performed by the controller of the present sewing machine.

Fig. 26 is a diagram for explaining names of respective parts of button holes.

Explanation of reference numerals for main parts of the drawings

1: buttonhole sewing machine 6: upper shaft

8: single needle bar 9: single needle

14 cloth support plate 15 working clamp

16: cloth cutting blade 18: knitting needle bar base

20: Y-supply pulse motor (Y-supply drive means)

40: reference line pulse motor (X-supply drive means)

41: swing width pulse motor (x-supply driving means)

80: upper thread cutting blade 100: CPU (central processing unit, control means)

110: operation panel (selection means)

In order to solve the conventional problems as described above, the first aspect of the present invention provides a sewing means for stitching the outer circumference of the buttonhole on the material, a cloth cutting blade for cutting the buttonhole on the material, and a control means. And controlled by the control means such that the cloth cutting blade is operated to cut the buttonhole during the first round stitching and the second one is not operated during the second round stitching when the sewing means stitches the outer periphery of the buttonhole in two rounds. Provide buttonhole sewing machines.

According to this first aspect, since the buttonhole is cut in advance of the second round stitching, the cutting edge portion of the material formed by the cloth cutting blade is sewn inside the second round stitch and is not exposed outside of the stitch. An improved appearance seal can be obtained in which the edges are not exposed. Moreover, since the first round stitching is made before cutting the buttonhole on the material, a solid suture is obtained.

A second aspect of the present invention provides a buttonhole sewing machine of the first aspect as follows, wherein the sewing means comprises electrically actuated Y-feed drive means for moving the cloth feeder in the Y direction and the cloth feeder or the knitting needle in the X direction. Electrically actuated X-supply drive means for moving the machine, the control means being adapted to first and relative to each other when sewing around the buttonhole in two rounds under the control of the Y-supply drive and X-supply drive means; The cross stitch function for making the first round sewing path intersecting the second round sewing path by moving the knitting needle drop position of the second round sewing, the second by taking the same knitting needle drop position between the first round sewing and the second round sewing. An overlap stitch function for making a first round sewing path overlapping the round sewing path, and a cross stitch function or an overlap stitch Has selection means for selecting one of the functions.

According to the second aspect of the sewing machine, the cross-stitch function for the conventional double stitching pattern and the cross-stitch function for forming the cross stitch can be selected as the selection means, so that the sewing pattern can be very diverse.

Here, the sewing pattern suitable for the first and second aspects of the above-mentioned sewing machine has both end portions of the buttonholes radially formed around the end portions suitable for jeans as well as the sewing pattern composed of the bartacking portion and the parallel portion, which are suitable for the men's shirt. It also includes patterns.

A third aspect of the present invention provides a buttonhole sewing machine of the first aspect as follows, wherein the buttonhole sewing pattern has a parallel sewing portion parallel to the buttonhole and bartacking portions at both ends of the buttonhole, and the control means The bartacking portion has a bartacking thin-out function that is not stitched in the first round sewing but stitched in the second round sewing by the sewing means.

According to the third aspect of the sewing machine, the double stitching is only applied to the parallel sewing portion having the low density suture and not the bartacking portion having the high density suture, thus the sewing machine has excessive swelling at the bartacking portion which appears in the conventional double stitching. To provide a high quality seal without. Moreover, breaking of the thread is prevented because the friction in the sewn thread is less.

A fourth aspect of the present invention provides a buttonhole sewing machine of the third aspect as follows, wherein the sewing machine is for selecting one of a bartacking coarseness function or a sewing function for stitching the bartacking portion in both the first and second round sewing. It has a selection means.

According to the fourth aspect of the sewing machine, the sewing machine can select a conventional double stitching or sparse pattern in the bartacking part by the selecting means, so that the sewing pattern becomes very diverse.

An embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a buttonhole sewing machine 1 embodying the present invention. 2 is a perspective view schematically showing a cloth feeder and a single needle lift of the sewing machine 1. 3 is a perspective view schematically showing a single needle lift and a single needle swing machine of the sewing machine 1.

The buttonhole sewing machine 1 swings from side to side and moves up and down, the knitting needle 9, the work clamp 15 for pressing the fabric (i.e., the material to be sewn), the cloth on it, and moves back and forth in the feeding direction of the cloth. Entering the cloth support plate 14, the upper thread cutting blade 80 for cutting the upper thread on the work clamp 15, the cloth cutting blade 16 for cutting the cloth to form the buttonhole, selection means and setting data An operation panel 110 (see FIG. 10) as a data input means for controlling the sewing machine 1 and a controller (see FIG. 11).

The work clamp 15 and the cloth support plate 14 constitute a part of the cloth feeder and support the cloth during sewing to move the cloth back and forth in the cloth feed direction. As shown in FIG. 2, the work clamp 15 is connected to the bracket 23 via a connecting arm 24, and the cloth support plate 14 is directly connected to the bracket 23. The bracket 23 is fixed to a supply shaft 22 having a toothed rod 22a, and a Y-supply driving means composed of a pulse motor or the like for moving the work clamp 15 and the cloth support plate 14 back and forth. It moves back and forth by the operation of the Y-supply motor 20, such as.

As shown in FIGS. 2 and 3, the needle needle lifter for raising and lowering the needle needle 9 includes an upper shaft 6, a motor such as a sewing motor 5 or a pulse motor, and the crank cam 7. . Rotation of the sewing motor 5 is switched to the vertical movement of the knitting needle bar 8 through the crank cam 7 to move the knitting needle 9 up and down. The upper shaft 6 is lowered through the vertical shaft 10 having bevel gears 10a and 10b fixed to both the upper and lower ends to drive the hook 12 connected to the lower shaft 11. It is connected to the shaft 11.

4 is a front view of the knitting needle swing machine of the sewing machine 1 as viewed from the knitting needle side. 5 is a representative view of a single needle swing for explaining the operation of the single needle swing. FIG. 6 is a diagram showing a series of operations of the single needle swinger. FIG. 6A is a state diagram of the single needle swinger in which the upper end of the cam of the single needle swing cam 54 is placed on the side of the reference line, and FIG. 6B is the upper end of the cam 54. Is a state diagram of a single needle swing machine placed on the cam swing width side.

The needle needle swing machine swinging the needle needle 9 to the left and right, the main needle needle swinger swinging the needle needle 9 to the left relative to the reference line as the origin, a swing width changer for changing the needle needle swing width, and a reference line for changing the reference line to the left and right. Include a modifier.

As shown in FIGS. 3 to 6, the main needle needle swing machine includes a needle bar swing base 18, a needle needle arm 49, a connection shaft 48, a connection lever 47, a needle needle cam cam 46, A single needle swing cam (triangular cam) 54, a drive shaft 53, and reduction gears 51, 52 are included. Rotation of the upper shaft 6 is transmitted to the single needle swing cam 54 to swing the single needle swing cam lever 46 by a given width, and then the needle bar swing base 18 swings about the pivot axis 18a. The knitting needle 9 swings from side to side. In this case, the connecting shaft 48, the drive shaft 53 and the turning pin 44b are fixed in their position during the swing movement of the needle bar swing base 18. On the other hand, the turning pin 45a and the connecting pin 46a are rotatably connected to the associated member and can be moved.

The knitting needle swing movement occurs simultaneously with the vertical movement of the knitting needle 9 through the upper shaft 6. When the knitting needle 9 descends to an odd number, the knitting needle bar 8 is positioned on the reference line. When the knitting needle 9 is lowered evenly, the knitting needle bar 8 swings to the left of the reference line by a given swing width.

Fig. 7 shows a change in the reference line position to be executed by the single needle swing, and Fig. 8 shows a change in the swing width to be executed by the single needle swing.

In the swing width changer, as shown in FIG. 8, rotation of the swing width motor 41 or the pulse motor or the like enables the swing pin 44b to swing through the links 55 and 56, thereby changing the swing width. By adjusting the movement of the cam lever 46 to move in the direction (left and right directions), the swing width of the knitting needle 9 is changed.

In the reference line changer, as shown in FIG. 7, the position of the turning pin 44b toward the change direction (up-down direction) of the swing movement origin when the reference line motor 40, pulse motor, etc. rotates. By swinging around the pivot shaft 43a so as to change, the reference line position for the swing of the knitting needle 9 is changed.

That is, the swing width motor 41 and the reference line motor 40 constitute X-supply driving means for swinging the knitting needle bar 8 to the left and right sides by the operation of the knitting needle swing by these motors.

Fig. 9 is a perspective view of a cloth cutter (cloth cutting means) in which a button hole is formed by a cloth cutting blade moved downward to a buttonhole position on a material. The cloth cutter includes a blade mounting plate 31 having a cloth cutting blade 16 attached to a lower end thereof, a driving lever 35 that rotates about a pivot shaft 35a to drive the mounting plate 31 up and down, The blade drive arm 36, which is connected to the upper shaft 6 so as to transmit its rotation, and always moves up and down at high speed at one end thereof, to transfer the vertical motion of the drive arm 36 to the drive lever 35. A blade drive hook 37 arranged to engage the drive arm 36 and a solenoid 75 for controlling the connection / disconnection between the drive hook 37 and the drive arm 36.

Since the plunger 75a of the solenoid 75 is generally pressed to separate the drive hook 37 from the drive arm 36, the cloth cutting blade 16 will still remain in its upper position. When the plunger 75a is retracted according to the blade drive command, the engaging groove 37a on the drive hook 37 engages with the drive arm 36 by the pulling action of the spring 37b. The up and down motion of the drive arm 36 is transmitted to the drive hook 37 and the drive arm 35 so that the blade mounting plate 31 moves down.

10 is a front view of the operation panel 110 associated with the sewing machine 1 which is an embodiment of the present invention. For example, various sewing variables are input to the operation panel 110 mounted on the sewing table on which the sewing machine 1 is installed, and setting values or error states are displayed. Parameters set through the operation panel 110 include "double stitching selection", "bartacking thin-out", and the like, and "double stitching selection" is formed by the first and second round stitching. The pattern is selected and " bartacking coarseness " selects the pattern formed by not stitching the bartacking portion in the first round sewing. The operation panel 110 has selection means for selecting these variables.

The operation panel 110 includes a sewing key 131 for starting sewing, a light emitting diode (LED) indicator 132 for indicating a sewing mode after pressing the sewing key 131, and a selection key for selecting an input mode ( 133, the pattern number display unit 134 indicating the input mode selected by the selection key 133, the variable number display unit 135, the mode indicator 141 consisting of two numbers of seven partial components, and four numbers of seven partial components. A variable indicator 142 consisting of: a negative key 143 and a plus key 144 for decreasing and increasing by ± 1, respectively, a decreasing key 145 and an increasing key for decreasing and increasing an input variable value by a given unit, respectively; 146, and a setting key 147 for notifying the knitting needle 9 that the thread is sewn and for selecting a hook position.

11 is a block diagram of a circuit configuration in the sewing machine 1. As shown in FIG. 11, the controller of the sewing machine 1 includes a central processing unit (CPU) 100, a random access memory (RAM) 102, a read only memory (101), a Y supply counter 103, and a reference line. Supply counter 104, single needle swing width counter 105 for counting the amount of rotation of each pulse motor, cloth cutting knife counter 106 for counting the number of drive of the cloth cutting blade, Y supply pulse motor driver 111 ), Baseline supply pulse motor driver 112, single hand swing width pulse motor driver 113 for driving each pulse motor, I / O interface 109 for connecting various sensors and various drivers and the operation panel 110. ), A sewing motor driver 115 for controlling and driving the sewing motor 5, a sewing motor encoder 119 for outputting a rotation amount of the motor 5 with a sign indicating a rotation angle of the upper shaft 6, a thread expander At 19, drive the VCM (Voice Coil Motor) 60 to adjust the upper thread tension. Effective tension driver 120, work clamp driver 121 for driving work clamp solenoid 122 to lift work clamp 15, cloth cutting blade cylinder 30 to lower fabric cutting blade 16 A cloth cutting blade cylinder driver 123 for driving the < RTI ID = 0.0 > and < / RTI > Include.

The sewing motor driver 115 is not only connected to the sewing motor 5, but also the reference position of the knitting needle upper position sensor 116, the work clamp 15, and the cloth support plate 14 for detecting the upper position of the knitting needle 9. And a supply reference position sensor 117 for detecting a signal, and a tacho generator 118.

The I / O interface 109 is used to detect the lowering of the blade lowering detection switch 34 and the work clamp 15 to detect the lowering of the fabric cutting blade 16 as well as the operation panel 110 and various drivers. Y supply origin sensor 26 for detecting the origin of the clamp lowering detection switch 28, work clamp 15, and cloth support plate 14, and baseline supply origin sensor 57 for detecting the origin of the reference line of the single hand swing. ), The starting point for instructing the start of the drive of the sewing motor 5, the starting point for the knitting needle swing width supply origin sensor 58 for detecting the origin of the knitting needle swing width, the working clamp switch 124 for instructing the lowering of the working clamp, and the sewing motor 5; Switch 125.

The CPU 100 uses a specific area of the RAM 102 as a work area according to a control program stored in the ROM 101 and various drivers, signals detected from various sensors, and data input / output to / from the operation panel 110. To control.

The ROM 101 is an input process for inputting various setting variables from the operation panel 110, a calculation process for calculating sewing patterns such as single stitching and multiple double stitching, and a sewing process for stitching buttonholes according to the calculated pattern. Stores a control program and control data for executing. The calculation process and sewing process will be described in detail below.

By the above-described configuration, the sewing machine 1 receives various setting data from the operation panel 110, calculates a sewing pattern to be sewn, and controls various kinds of buttonhole sewing patterns by controlling and driving the sewing machine 1. Sew.

The items set from the operation panel 110 will be described below. FIG. 12 is a diagram showing an item input from the operation panel 110, and FIG. 13 is a diagram showing length variables of respective portions of one sewing pattern.

The setting data input from the operation panel 110 is "cloth cutting length" (a), "blade width" (b), "bartack stitch length" (c), "bartack stitch width" (d), and "parallel". Minor pitch "(e)," bartack stitch pitch "(f)," cloth cutting blade-first bartacking space "(g)," cloth cutting blade-second bartacking space "(h) Length data (see Fig. 13) of the pattern portion, and "blade lowering left / right position" data indicating the displacement of the blade lowering position in the left and right directions; "Effective tension selection" data indicating the selected value of the VCM 60 to adjust the tension of the inflator 19, "parallel tension", "bartacking tension", "start sewing" as tension data at each sewing timing Tension "," sewing end tension "and" thread cutting tension "; "Cloth cutting size" data (L1), "work clamp size" data, "single / double stitching conversion" data, "select double stitching", "first round bartacking coarseness", "first round in double stitching" Knife drive "," sewing start supply position "indicating the feeding position at the start of sewing," sewing starting reference line position "indicating the reference line position at the start of sewing (reference position of the single needle swinger), and the cloth cutting blade 16 "Sewing machine speed at the time of the blade drive" indicating the speed of the sewing machine when driving.

Among the setting items, item numbers 18 to 21, that is, "single / double stitching conversion", "double stitching selection", "first round bartacking coarseness", and "first round blade drive" are related to the present invention.

"1" or "2" in the item "single / double stitching conversion" indicates single stitching or double stitching respectively. "0" or "1" in "Double stitching selection" selects the overlap stitch or cross stitch function in double stitching. "1" or "0" in "first round bartacking roughness" indicates the bartacking roughness function in the bartacking portion in the double stitching or the stitches of the second round. "0" or "1" in "first round blade drive" selects whether the cutting blade is driven at the first round sewing or not.

When the sewing machine 1 operates, the operator first executes an input process for inputting setting data from the panel 110. Since each setting item is a preset default value or pre-entered data in the memory, the operator will enter only data that needs to be changed.

Each setting item has its own data range to be set, which checks to see if the data is within range to report an error.

A plurality of setting data groups are registered corresponding to the number of sewing patterns. The operator selects the pattern number to read the corresponding setting data group that controls the sewing of the specific pattern.

After inputting the setting data, the working material is set in the sewing machine 1 and the sewing key 131 on the panel 110 is ON, so that the controller starts calculating the sewing pattern based on the input data. 14 and 15 continually show each sewing sequence of the calculated sewing pattern.

If "Single / Double Stitching Conversion" is selected as "2", "Double Stitching Selection" is selected as "1" and "First Round Bartacking Roughness" is selected as "1", the cross stitch and bartacking roughness function Starting to work, the patterns shown in reference numerals 1 to 14 in Figs. 14 and 15 appear sequentially.

The cross function is a pattern formed by making the first round sewing sutures intersecting with the second round sewing sutures at the left and right parallel portions A and C (see FIG. 26). Speaking of the cross stitch function in the parallel portion A, for example, the first round sewing sutures P2-P3 (see reference numeral 2 in FIG. 14) are the second round sewing sutures P7-P8; FIG. 14. Cross reference), one stitch is displaced without a cloth supply (dummy stitch) at the beginning of the second round sewing (P6-P7; see original number 6 in FIG. 14). The sewing at the right parallel part C will be performed in the same manner as in the part A. FIG.

The bartacking coarsening function is achieved by applying only the second round bartack stitch without the first round stitch in the first and second bartacking portions B and D. FIG. For example, the bartacking coarseness at the site B may include a second round bar in addition to the first round transition stitch P3-P4; transition from the site A to the site C; see reference numeral 3 in FIG. 14. It is formed by tack stitches P9-P10 (see reference numeral 9 in Fig. 15). The second bartacking portion D will be sewn in the same manner as in the portion B.

As shown in reference numeral 3 in FIG. 14, the transition stitch is finished after the two stitches are sewn in the portion B from the end point P3 of the portion A, and the knitting needle reference line is the portion ( C) is moved to the position for sewing, and then the material is supplied in the Y direction and stitched to the sewing start point P4 in the same manner. The transition from the right side C to the left side A is performed. Stitches P5-P6 (original number 5 in FIG. 14) will also be executed in the same manner. In reference numerals 3 and 5 of Fig. 14, the white spots indicate the dropping point of the needle on the side of the baseline.

If the setting item "Double stitching selection" is designated as "0", the superimposed stitch function is executed to remove the dummy stitch as described above at the start point of the second round sewing of the parallel part. By overlapping on the same line (see reference numeral 6 in FIG. 14).

If the bartacking coarse function is not selected at the time of the input operation so that "first round bartacking coarseness" becomes "0", pattern calculation for the normal bartacking stitch is executed, as shown in original numbers 3 and 5 of FIG. The above-described transition stitch pattern calculation is omitted.

After the sewing pattern is calculated, the blade drive time for driving the cloth cutting blade 16 is calculated. If "first round blade drive" is designated as "0", the predetermined time in the second round sewing is calculated, and if designated as "1", the predetermined time in the first round sewing is calculated.

This calculation process will be described in detail below.

After the calculation of the sewing pattern is completed, buttonhole sewing is executed by dropping the knitting needle 9 according to the coordinates calculated by the Y-feeding motor 20, the baseline supplying motor 40, and the knitting needle swing-width motor 41. do. During this sewing, the cloth cutting blade is lowered to cut the buttonhole at the calculated time to form the buttonhole.

In the last process, the upper thread is cut by the upper thread cutting blade 80 and the lower thread is cut by the cutting blade (not shown) under the knitting needle to complete one cycle of buttonhole sewing.

The procedure of the process including the double stitching pattern calculation as described above executed by the controller of the sewing machine 1 will be described in detail as follows. 16 is a system diagram of a process sequence showing a buttonhole sewing sequence. This buttonhole sewing process is started by, for example, starting the sewing machine 1.

When the sewing machine 1 is started, a subroutine for the operation panel setting process is executed in step S1. If the sewing key 131 is ON in step S2, the process proceeds to step S3, otherwise returning to step S1. These steps S1 and S2 are repeated until the sewing key 131 on the panel 110 is pressed, during which all setting data shown in FIG. 12 can be input.

In step S3, a subroutine for generating sewing data is executed to calculate the drive time and sewing pattern of the cloth cutting blade 16 based on the input setting data. In step S4, for example, an error flag is read from the RAM 102, and if any error flag is recorded in the previous step, an error corresponding to the display unit 140 on the panel 110 is displayed in step S5. The process is stopped, otherwise proceed to step S6.

In step S6, a signal for lowering the work clamp 15 is output to the work clamp solenoid driver 121. Then, in step S7, the Y supply origin sensor 26, the baseline supply origin sensor 57 by the movement of the Y supply motor 20, the baseline supply motor 40, and the single needle swing width motor 41, respectively. And the origin of each of the cloth feeder and the single needle swinger based on the output detected from the single needle swing origin sensor 58. In step S8, the motors 20, 40, 41 are driven to move the knitting needle 9 to the first knitting needle lowering position.

In step S9, a signal for raising the work clamp 15 is output to the work clamp solenoid driver 121. If in step S10 the sewing key 131 is confirmed to be ON, the process proceeds to step S11, otherwise returning to step S1. In step S11, the work clamp switch 124 is detected. If the work clamp switch 124 is ON, the process proceeds to step S12; otherwise, the process returns to step S10 and repeats this. After the work clamp switch 124 is ON, it is checked in step S12 whether the work clamp 15 is in its upper position by means of the clamp falling detection switch 28. If the work clamp 15 is in the upper position a signal for lowering the work clamp 15 is given in step S13, and if the work clamp 15 is down the signal for raising the work clamp 15 is stepped. The output is made at S14 and the process returns to step S10.

If the clamp switch 124 is confirmed to be ON in step S15, the process proceeds to step S16, otherwise the work clamp 15 is raised in step S14. If in step S16 the start switch 125 is ON to immediately start sewing, the process proceeds to step S17, otherwise returns to step S15.

In step S17, the sewing process is executed based on the sewing data generated in the sewing data generation process in step S3, and this sewing process is sewing the buttonhole from the beginning to the end by driving the sewing motor 5; And driving the cloth cutting blade 16 and adjusting the tension of the thread set in the inflator 19 for each sewing time.

In step S18, for example, the error flag recorded in the previous step is read out from the RAM 102, and if there is no error, the process proceeds to the next step S19, and if no error is found, the panel in step S20. An error corresponding to the display unit 140 on 110 is displayed and the process is stopped.

In step S19, the thread cutting tension is given to the inflator by sending a preset value to the effective tension driver 120.

In step S21, the thread cutting / clamp raising process is executed, and the working clamp 15 is raised after the thread is cut by the upper thread cutting blade 80.

If the upper position of the work clamp 15 is detected by the clamp lowering detection switch 28 in step S22, the seal expander 19 is loosened in step S23 by the actuation of the effective tension driver 120. The process then returns to step S10 and is repeated.

FIG. 17 is a schematic diagram of a subroutine for generating sewing data according to step S3 in the general flow of FIG. 16. First, in step S31, the setting data input in the previous step S1 is compared with the setting range stored in the ROM 101 (see Fig. 12). If the input data is out of range, an error flag is set inside RAM 102. If any error is found in step S32, this subroutine terminates and returns to the normal process. If no error is found in step S32, the process proceeds to step S33 for calculating the sewing pattern and after this step goes to step S34 for calculating the driving time of the cloth cutting blade 16. End the routine.

18 is a schematic diagram of a subroutine for pattern calculation in step S33 in the sewing data generation process.

In step S41, the coordinate positions for the first few stitches from the first knitting needle drop position to the starting point of the left parallel portion (P1-P2 in Fig. 14) are input to the "sewing start supply position" and "sewing start reference line position" input data. Is calculated on the basis of and is stored in the RAM 102.

According to the designation of "single / double stitching conversion", "double stitching selection" and "first round bartacking coarseness" input data, an appropriate branch among steps S42, S43 and S44 is selected.

If double stitching is not specified, the calculation process in step S46 is executed. If double stitching, overlap-stitch and normal bartacking are specified, the calculation process in steps S47 and S48 is selected, and if double stitching, overlap-stitch and bartacking coarseness is specified, step S49 and The calculation process in step S50 is selected, and if double stitching, cross-stitch and normal bartacking are specified, the calculation process in steps S51 and S52 is selected, and if double stitching, cross- If the stitch and bartacking coarseness is specified, the calculation process in steps S53 and S54 is selected. After each calculation process is completed, this subroutine ends and moves to the next step of the sewing data generation process (see FIG. 17).

In practice, calculation process A (steps S46, S47, S48, S50, and S51) is for normal buttonhole closure, calculation process B (steps S49 and S53) for buttonhole closure without bartacking, and calculation process C (steps S52 and S54) corresponds to buttonhole sutures in which one stitch is moved relative to the suture portion in step A. FIG. Details of these calculations are described below.

19 is a system diagram of a calculation step A in the pattern calculation step.

First, in the calculation step S61 for the left parallel part, on the basis of the input data in step S1, the single needle swing reference line position "a1" (point P2 in FIG. 14), single needle swing width db / 2 (FIG. 13). And the feed pitch "e" (the length of the left parallel part divided by any integer).

Next, in the calculation step S62 for the first bartacking portion, the baseline position "a2" (point P9 in FIG. 15), bartack stitch width "d", and feed pitch "f" (length of the bartacking portion are determined. Divided by an arbitrary integer). In the calculation step S63 for the right parallel part, the baseline position "a3" (point P4 in FIG. 14), the width d-b / 2 (see FIG. 13), and the pitch "e" are calculated. In the calculation step S64 for the second bartacking portion, the baseline position "a4" (point P13 in FIG. 15), the width "d", and the pitch "f" are calculated. In the sewing finish calculation step S65, the total number of stitches is calculated as the sum of the respective stitch numbers of the portions, that is, the left parallel portion, the first bartacking portion, the right parallel portion, and the second bartacking portion, and each stitch number is Calculated by dividing the length of each site by its own feed pitch.

By calculation step A, one round of stitches for normal buttonhole sewing is calculated.

20 is a system diagram of a calculation step B in the pattern calculation step. In step S71, the same calculation as in step S61 is performed. The calculation of "a2" which is the same as the calculation in steps S63 and S73 is performed in step S72 and the calculation "a4" is performed in step S74, respectively.

By calculation step B, one round of buttonhole sewing without bartack stitching is calculated.

21 is a schematic diagram of the calculation step C in the pattern calculation step. First, by one stitch calculation with the pulse motor motion "0" in step S81, one stitch without driving of the Y-supply motor 20 (P6-P7 in reference numeral 6 in Fig. 14) is calculated. do. Subsequently, the same calculation as in step S61 is performed in step S82, and the same calculation as in step S62 is performed in step S83, Y- in the swing knitting mechanism by one stitch calculation with the pulse motor motion "0". In the step S84, the calculation for one stitch without driving of the motor such as the supply motor 20 or the like (P12-P13 in reference numeral 12 in Fig. 15) is performed in step S84, and the same calculation as in step S63 is performed in step S85. The same calculation as in step S64 is performed in step S86, and the same calculation as in step S65 is performed in step S87, respectively.

By calculation step C, one round of buttonhole closure in which one stitch is moved relative to the seam in Step A is calculated.

The sewing pattern specified by the input setting data is solved by the combination of the above-described processes A, B, and C following the pattern calculation process of FIG. For example, by the combination of processes B and A in each of the steps S49 and S50, the first round suture is parallel to the second round suture (overlapping-stitch) in parallel and the first round batak stitch is obtained. The sewing pattern is calculated to be thin-out.

FIG. 22 is a system diagram of a subroutine for calculating the blade drive time performed in step S34 in the sewing data generating process of FIG. 17. FIG. 23 is a chart showing the blade driving stitch number Mn variable used in the calculation of FIG.

This blade drive time calculation step calculates the blade drive number "n" for the blade 16 and the number of blade drive stitches "M1 to Mn" corresponding to the number "1 to n" (see Fig. 23).

First, in step S101, single stitching or double stitching is selected by the setting data "single / double stitching conversion". In step S102 for double stitching, the process branches to step S104 if the setting data "first round blade drive" indicates the first round drive, and to step S105 if it indicates the second round drive. Diverge.

If a single stitch is selected in step S101, the number of stitches up to the start point of the right parallel part calculated in the pattern calculation process of Fig. 18 is changed to the variable "M" in step S103. If branching to step S104 through steps S101 and S102, the number of stitches up to the first round start point (P4 in FIG. 14) of the right parallel part is changed to the variable M. FIG. If branching to step S105, the number of stitches up to the second round start point (P10 in FIG. 15) of the right parallel part is changed to the variable M. FIG.

Then, in step S106 to step S113 based on the input data "cloth cutting length" (a) and "cloth cutting blade size" L1, the blades necessary for cutting the buttonhole length a ( 16) Drive number "n" and the number of blades 16 driving stitches M1 to Mn up to the nth of the blade drive are calculated. That is, the cloth cutting blade 16 is driven when the number of stitches reaches the number M1 to Mn counted from the start of sewing.

In other words, after replacing the variable M instead of the number of stitches of the first or second round sewing start point of the right parallel part in steps S101 to S105, the cutting blade dropped in the first or second round sewing. The number of stitches for (16) can be calculated according to the cutting blade driving time calculation process.

FIG. 24 is a schematic diagram of a subroutine for the sewing process in step S17 in the general flow of FIG. 16.

This sewing process starts at step S131 in which the total number of stitches calculated in the pattern calculation process is assigned to the "number of remaining stitches" variable, and in step S132, the sewing machine start signal for driving the sewing motor 5 is output. Next, the process moves to step S133 to check whether the sewing machine is in a rotating state. If the sewing machine is rotating, the program moves to step S134, otherwise the program is repeated until it is changed to the rotating state. Then, steps S134 to S141 are repeated for the actual sewing process until the sewing machine is stopped.

In step S134, the rotation of the sewing machine is checked and the process is stopped when the sewing machine is stopped.

When the rotation angle of the upper shaft 6 according to the TG generator 118 reaches a predetermined angle in step S135, the knitting needle drop position is the Y-supply motor 20, the baseline motor 40, and the swing width. It moves according to the calculated sewing pattern by the operation of the motor 41. That is, the actual sewing is performed with the material supplied according to the specific sewing pattern by the process of steps S135 and S136.

When the knitting needle 8 rises on the predetermined position detected by the knitting needle upper position sensor 116 in step S137, the process moves to step S138, where the number of stitches is counted and the cloth cutting blade 16 The driving process is executed when the number of stitches reaches the number of blade driving stitches " M1 " to " Mn ".

If the supply reference interrupt is requested in accordance with the supply reference position sensor 117 in step S139, the process moves to step S140 to perform a setting process executed at the supply reference position. And in step S141, the blade 16 is operated when the number of stitches coincides with the number of blade driving times.

According to the embodiment of the controller of the sewing machine 1 as described above, by selecting "1" in the setting variable "first round blade drive", the cloth in the first round sewing to cut the buttonhole prior to the second round sewing Since the cutting blade 16 is driven, the cutting edge of the material formed by the cloth cutting blade is sewn on the inside of the second round stitch and is not exposed on the outside of the stitch, thus improving the appearance of the suture without exposing the cutting edge. You can get it.

By selecting the setting variable "Double stitching selection" as "0" to obtain the cross stitch function of the second round suture crossing the first round suture, the conventional second overlap suture overlaps the first round suture on the same line. An improved suture pattern is obtained as compared to the double stitching pattern. In addition, since the cross stitch is applied only to the parallel part, the appearance is excellent and the sewing cycle time is reduced by minimizing the number of stitches.

Moreover, the cross stitch function for forming the cross stitch and the overlap stitch function for the conventional double stitching pattern can be selected by the setting parameter "double stitch selection", thereby obtaining a wide variety of sewing patterns.

By assigning " 1 " to the setting variable "first round bartacking coarseness ", the double stitching is only applied to parallel sewing portions having low density sutures and not to bartacking portions having high density sutures, so that the sewing machine is It prevents excessively inflated sutures in the bartacking sections seen in stitching, providing a high quality suture. In addition, since the present sewing machine makes it possible to select a normal double stitching or sparse pattern on the bartacking portion by selecting " first round bartacking roughness ", a wide variety of sewing patterns can be obtained.

The present invention is not limited to the controller of the sewing machine 1 described above. For example, the supply in the X direction may be performed by the supply of material instead of the knitting needle of the above-described embodiment. Although a pulse motor is used as a driving means in the specification, a servo motor or the like may be used. In the sewing pattern, it is also possible to apply the present invention to a pattern in which each bartacking portion is stitched radially from the buttonhole end portion. There may be other variations in the double stitching process.

25 is a system diagram of another embodiment of a buttonhole treatment step.

In the double stitching process, double stitching sewing is performed in accordance with the double stitching calculation result of the above-described embodiment. However, the process shown in FIG. 25 may be applied. That is, after the first round sewing is completed in step S201, if double stitching is indicated in step S202, the process proceeds to step S203 to execute the second round sewing, otherwise the process is a sewing process. Ends. Then, the work clamp 15 can be raised in step S204 to end the buttonhole process.

By the sewing machine according to the present invention, it is possible to improve the appearance of the suture without exposing the cutting edge portion at the time of cutting by the cloth cutting blade. In addition, by the controller for buttonhole sewing machines according to the present invention, it is possible to obtain a double stitching pattern with a wide variety of improved appearances in which unnecessary overlapping stitches are removed.

Claims (4)

A buttonhole sewing machine, comprising sewing means for stitching the outer circumference of a buttonhole on a material, a cloth cutting blade for cutting the buttonhole on the material, and a control means, The cloth cutting blade is operated to cut the buttonhole during the first round stitching when the sewing means stitches the outer periphery of the button hole in two rounds, and the fabric cutting blade is not operated during the second round stitching. Buttonhole sewing machine controlled by control means. 2. The X-direction feed drive of claim 1, wherein the sewing means is electrically actuated Y-direction feed drive means for moving the cloth feeder in the Y direction and electrically actuated X-direction feed drive for moving the cloth feeder or the single needle swing in the X direction. It includes a means, By moving the knitting needle drop positions of the first and second round stitches with respect to each other when the control means sew around the buttonhole in two rounds under the control of the Y-direction feed drive means and the X-direction feed drive means. A cross stitch function for making a first round sewing path that intersects a second round sewing path, and the first overlapping path with the second round sewing path by taking the same needle drop position between the first round sewing and the second round sewing; A buttonhole sewing machine having a superimposed stitch function for creating a round sewing path, and selecting means for selecting one of the cross stitch function or the superimposed stitch function. The buttonhole sewing pattern according to claim 1, wherein the buttonhole sewing pattern has parallel sewing portions parallel to the buttonholes, and bartacking portions at both ends of the buttonholes, and the control means includes: the bartacking portion is stitched in the first round stitching. And a buttonhole sewing machine having a bartacking coarseness function stitched in the second round sewing by the sewing means. 4. The buttonhole sewing machine according to claim 3, further comprising selecting means for selecting one of the bartacking coarseness function or a sewing function for stitching the bartacking portion in both the first round sewing and the second round sewing.