JP3947600B2 - Buttonhole sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a buttonhole sewing machine that forms buttonhole stitches on a cloth while performing needle swinging in synchronization with cloth feed.
[0002]
[Prior art]
For example, a buttonhole sewing machine that forms a buttonhole stitch by control of a cam or a predetermined program is known.
In this buttonhole sewing machine, the length to the inner edge of the side stitching portion is set evenly from side to side with the knife dropping point as the center.
[0003]
[Problems to be solved by the invention]
As mentioned above, in the buttonhole sewing machine, conventionally, the length to the inner edge of the side sewing part is set to the left and right evenly with the knife drop point as the center. The length (width) from the knife drop point to the inner edge of the left and right side stitches is not equal to the left and right as set, due to errors in assembly of the sewing machine, etc., and cutting with one of the side stitches with a cloth cutting knife In some cases, the fabric protrudes to the end, making the seam unsightly, or conversely cutting the seam at the side seam.
Moreover, the width from the knife dropping point to the inner edge of the left and right side stitching portions could not be changed without changing the width of the buttonhole stitching seam, in other words, the width of the barbed portion.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to make it possible to adjust the distance between a button hole, that is, a knife dropping position and a left and right sewing portion with respect to the button hole in a buttonhole sewing machine such as a sleep hole or an eyelet hole.
[0005]
[Means for Solving the Problems]
  In order to solve the above problems, the invention described in claim 1
  A stitch cutting mechanism that includes a cloth cutting knife that moves up and down with respect to the sewing product to form a button hole, a feed mechanism that can reciprocate the sewing product in a predetermined direction, and a needle swing mechanism that swings the needle in a predetermined direction. By predefining, for example, the amount of movement of the cloth in the front-rear direction, the left-right position of the needle, the needle swing position, and the lowering position of the cloth-cutting knife, based on data stored in RAM, for example. In a buttonhole sewing machine that forms buttonhole stitches with left and right side stitching parts so that the inner edge is positioned at a predetermined length away from the buttonhole on the left and right of the buttonhole,
  Lowering position of the cloth cutting knife forming the button holeBased onSetting means for setting the buttonhole stitching to move in the left-right direction, for example, provided on the operation panel, etc.,
  According to the setting of the setting means, the buttonhole stitching is moved in the left / right direction with the knife dropping position as a reference, and the distance between the buttonhole and the left / right side stitching portion can be adjusted.It is characterized by its configuration.
[0006]
Here, the data is stored in, for example, a RAM.
In addition, the buttonhole stitch seam left-right direction position setting means is provided, for example, on the operation panel.
[0007]
  As described above, according to the first aspect of the present invention, the lowered position of the cloth cutting knife that forms the button hole.Based onSince the buttonhole sewing machine is provided with setting means for setting the buttonhole stitching to move left and right, the knife drop position depends on the setting means setting.Based onIt is possible to adjust the distance between the buttonhole stitches in the left and right directions and the left and right stitches with respect to the buttonholes.
  Therefore, the distance from the button hole to the inner edge of the left and right side sewing portions can be made equal to the left and right.
[0008]
  The invention according to claim 2
  A stitch cutting mechanism that includes a cloth cutting knife that moves up and down with respect to the sewing product to form a button hole, a feed mechanism that can reciprocate the sewing product in a predetermined direction, and a needle swing mechanism that swings the needle in a predetermined direction. By predefining, for example, the amount of movement of the cloth in the front-rear direction, the base line position of the needle, the needle swing position, and the lowering position of the cloth cutting knife, based on data stored in RAM, for example. In a buttonhole sewing machine that forms buttonhole stitches with left and right side stitching parts so that the inner edge is positioned at a predetermined length away from the buttonhole on the left and right of the buttonhole,
  Lowering position of the cloth cutting knife forming the button holeBased onEach width can be set separately from the inner edge of the left and right sewing parts, for example, setting means is provided by being provided on the operation panel, etc.,
  By setting the width with the inner edge of the left and right side sewn parts based on the knife drop position by the setting means, the interval between the button hole and the left and right side sewn parts can be individually adjusted.It is characterized by its configuration.
  For example, the data is stored in the RAM.
  Further, the left and right side sewing portion individual setting means is provided, for example, on the operation panel.
[0009]
  Thus, according to the invention of claim 2, the lowered position of the cloth cutting knife that forms the button holeBased onSince the buttonhole sewing machine is provided with setting means that can set each width with the inner edge of the left and right sewing parts separately, the knife dropping position is set by the setting means.Based onEach width with the inner edge of the left and right sewing parts can be set separately, and the distance between the button hole and the left and right sewing parts can be individually adjusted.
  Therefore, the distance from the button hole to the inner edge of the left and right side sewing portions can be made equal to the left and right.
[0010]
And the invention of claim 3 is
A buttonhole sewing machine according to claim 2,
A configuration provided with changing means by changing the side stitching width without changing the buttonhole stitching width by setting each width by the setting means, for example, included in the CPU,
It is characterized by.
For example, the side sewing width changing means is included in the CPU.
[0011]
Thus, according to the invention described in claim 3, the button further provided with changing means for changing the side sewing width without changing the buttonhole stitching width by setting each width by the setting means described in claim 2. Since it is a hole sewing machine, the changing means according to the individual setting of the width between the inner edge of the left and right side seams with respect to the knife drop position by the setting means, the width of the buttonhole seam, i.e. The distance from the falling position to the inner edge of the left and right side stitches can be changed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment of the buttonhole sewing machine to which the present invention is applied will be described with reference to FIGS.
First, a configuration example of the apparatus will be sequentially described, and then a control method will be described.
[0013]
First, FIG. 1 is a perspective view showing an appearance of a buttonhole sewing machine as an example to which the present invention is applied. FIG. 2 is a schematic perspective view of the internal mechanism according to the first embodiment, and FIG. 3 is a perspective view of the internal mechanism as viewed from the opposite side of FIG.
1 to 3, 1 is a sewing machine frame, 5 is a sewing machine motor, 6 is an upper shaft, 7 is a crank mechanism, 8 is a needle bar, 9 is a needle, 10 is a vertical shaft, 11 is a lower shaft, and 12 is a shuttle. , 13 is a bobbin case, 14 is a cloth holding plate, 15 is a cloth presser (frame-shaped clamp body), 16 is a cloth cutting knife (vertical moving knife), 17 is a balance, 18 is a needle bar swing base, and 19 is a thread tension. , 20 is a feed motor (electric drive means: pulse motor), 21 is a feed mechanism (connecting means), 30 is an air cylinder unit for a cloth cutting knife, 31 is a knife mounting plate, 40 is a baseline motor, and 41 is a swing width motor. , 42 is a needle swing mechanism, and 60 is a voice coil motor.
As shown in the figure, the sewing machine frame 1 includes a bed 2 having a flat bed surface on the upper surface, a vertical trunk 3 standing on one end side of the bed 2, and a bed 2 from the vertical trunk 3. It is comprised from the arm 4 extended along parallel, and has comprised substantially U shape by the side view.
[0014]
In the above-described sewing machine frame 1, a sewing machine motor 5 is provided at the end of the vertical drum section 3, and an upper shaft 6 that rotates by driving of the sewing machine motor 5 is disposed in the arm 4. A needle bar 8 is connected to the tip part via a crank mechanism 7, and a needle 9 is attached to the lower part of the needle bar 8.
In addition, a vertical shaft 10 is disposed in the vertical body portion 3, and a lower shaft 11 is disposed in the bed 2, and a bobbin case 13 is attached to a hook 12 at the tip of the lower shaft 11. The upper end of the vertical shaft 10 is connected to the upper shaft 6 via bevel gears 6a and 10a, and the lower end is connected to the lower shaft 11 via bevel gears 10b and 11a.
Further, a movable cloth holding plate 14 is disposed on the bed 2, and a cloth presser 15 by a frame-shaped clamp body is disposed above the cloth holding plate 14. A cloth cutting knife 16 is disposed. The crank mechanism 7 incorporates a balance 17 that protrudes outward from the side surface of the tip of the arm 4.
Further, the needle bar 8 is incorporated in the needle bar rocking base 18 so as to be slidable up and down. The needle bar swinging base 18 is swingable about a swing fulcrum shaft 18a parallel to the upper shaft 6 at the upper end. A thread tension 19 is provided below the side surface of the distal end of the arm 4, and the thread tension 19 is variably controlled by a voice coil motor 60.
[0015]
A feed motor 20 that is an electric drive means for the cloth holding plate 14 and the cloth presser 15 is disposed in the vertical body 3, and this feed motor 20 is a pulse motor whose axis is in the vertical direction. A feed mechanism 21 is configured from the output shaft to the cloth holding plate 14 and the cloth presser 15.
Further, a cloth cutting knife air cylinder unit 30 is installed on the tip of the arm 4 as an electric drive means for operating the knife, and the knife moving up and down by driving the cloth cutting knife air cylinder unit 30. A mounting plate 31 is disposed vertically in the arm 4. A cloth cutting knife 16 is attached by a set screw 32 to a lower end portion of the knife attachment plate 31 protruding downward from the arm 4.
As shown in FIG. 10, a return spring 33 for ascending return is connected to the female mounting plate 31, and a detected portion of the female mounting plate 31 is located on the side of the female mounting plate 31. Proximity cloth cutting knife vertical position detection sensors 34a and 34b for detecting 31a are provided.
Further, a base motor 40 for determining the base line position of the needle bar rocking base 18 and a swing motor 41 for determining the swing width are disposed in the vertical body portion 3. Each of them is a pulse motor whose axis is parallel to the upper shaft 6 and in the horizontal direction, and a needle swinging mechanism 42 is configured from each output shaft to the needle bar rocking base 18.
[0016]
First, as shown in FIG. 2, the feed mechanism 21 includes a feed shaft 22 whose axis is in the horizontal direction, a bracket 23 for the cloth holding plate 14, a cloth holding arm 24 for the cloth presser 15, and the like. Thus, a connecting means from the feed motor 20 to the cloth holding arm 24 is configured.
That is, a feed shaft 22 having a rack 22 a that meshes with a pinion 20 a provided on an output shaft on the feed motor 20 is incorporated in the vertical drum portion 3, and protrudes from the vertical drum portion 3 to be positioned below the arm 4. A bracket 23 for connecting and supporting the cloth holding plate 14 to the lower end portion is fixed to the intermediate portion at the upper end portion. A base end portion of a cloth holding arm 24 provided with an attachment piece 25 for connecting and supporting the cloth presser 15 to the tip end portion is coupled to the lower side surface of the bracket 23 with a pin 24a as a fulcrum.
Although not shown, an actuator (such as an air cylinder unit or a solenoid) that raises the cloth holding arm 24 and a return spring that lowers and returns the cloth holding arm 24 are provided. However, the vertical movement of the cloth holding arm 24 may be performed by a pedal operation.
Further, a proximity feed origin detection sensor 26 that detects an origin position corresponding to the knife tip position based on the position of the feed shaft 22 is provided.
By the feed mechanism 21 described above, the cloth holding plate 14 and the cloth presser 15 move the bracket 23 and the cloth holding arm 24 from the feed shaft 22 that moves forward and backward by the engagement of the pinion 20a and the rack 22a when the feed motor 20 is driven by a pulse motor. It moves on the bed 2 integrally through each.
The above is the electric movement means for cloth feeding.
[0017]
Next, as shown in FIGS. 3 to 5, the needle swinging mechanism 42 includes a base arm 43, a base lever 44, a connecting link 45, a needle swinging cam lever 46, a needle swinging lever 47, a connecting shaft 48, a needle swinging arm. 49, a needle swing cam 54, a swing width arm 55, a swing width lever 56, and the like.
That is, the sector gear 43b provided at the lower end portion of the base line arm 43 with the support shaft 43a supported horizontally by the machine frame as the fulcrum of the intermediate portion is provided in the output shaft of the base line motor 40 in the vertical body portion 3. The pinion 40a meshes with the end of the base line arm 43, and the end of the base line lever 44, which is also bifurcated, is pivotably connected by a horizontal pin 44a. In the bifurcated portion of the base line lever 44, one end of the connecting link 45 is swingably connected by a horizontal pin 44b, and the needle swing cam lever 46 is swingably connected to the other end of the connecting link 45 by a horizontal pin 45a. It is connected.
Further, the tip end portion of the needle swing lever 47 is connected to the lower end portion of the needle swing cam lever 46 by a horizontal pin 46a so as to be swingable. A proximal end portion of the needle swing lever 47 is fixed to a proximal end portion of a connecting shaft 48 disposed in the arm 4 in parallel with the upper shaft 6. The base end portion of the needle swing arm 49 is fixed to the distal end portion of the connecting shaft 48, and the needle bar swinging base 18 swings on the tip end portion of the needle swing arm 49 via a square sesame or the like (not shown). It is connected freely.
[0018]
Here, the needle swing cam lever 46 has a cam engaging recess 46b whose upper portion is opened in a U-shape, and a needle swing cam 54 by an eccentric cam is engaged with the cam engagement recess 46b.
That is, the needle swing cam 54 is provided on the countershaft 53 to which rotation is transmitted from the upper shaft 6 through the reduction gears 51 and 52 at a reduction ratio of 1/2.
Further, a sector gear 55 b provided at the lower end portion of the swing arm 55 with the support shaft 55 a supported horizontally by the machine frame as a fulcrum of the intermediate portion in the vertical body portion 3 is connected to the output shaft on the swing motor 41. Is engaged with a pinion 41a provided on the upper end of the swinging width arm 55, and one end of the swinging width lever 56 is pivotally connected to the upper end of the swinging width arm 55 by a horizontal pin 56a. The other end portion of the swing lever 56 is swingably connected to the connecting link 45 via the horizontal pin 44b.
A base line origin detection sensor 57 by a magnetic sensor as a base line position detecting means is disposed on the side of the sector gear 43b of the base line arm 43, and a base line detecting magnet 43c is provided on one end side of the sector gear 43b. It has been. Similarly, a swing width origin detection sensor 58 using a magnetic sensor as a needle swing width detecting means is disposed in the vicinity of the sector gear 55b of the swing width arm 55, and for detecting the swing width on one end side of the sector gear 55b. The magnet 55c is provided.
Further, a needle swinging left / right position detection sensor 59 (base line side / needle swinging side detecting means) by a magnetic sensor is disposed on one side surface of the reduction gear 52 on the sub shaft 53 side, and the speed reduction gear 52 is provided for detecting the left / right position. The magnet 52a is provided.
By the way, the reduction gear 52 makes one rotation with respect to two rotations of the reduction gear 51 on the main shaft 6, that is, makes one rotation with respect to the needle 9 moving up and down twice. The needle swing left / right position detection sensor 59 is opposed to the magnet 52a in a rotational phase in which the needle 9 is positioned at the upper stop position and is swung toward the base line side.
[0019]
With the needle swing mechanism 42 described above, the needle bar rocking base 18 is driven by the base line arm 43 and the base line lever 44 by each drive of the base line motor 40 and the swing width motor 41 which are pulse motors as drive means. Alternatively, from the swing width arm 55 through the swing width lever 56, the swinging is performed via the connecting link 45, the needle swing cam lever 46, the needle swing lever 47, the connecting shaft 48, the needle swing arm 49, and the needle swing cam 54. Are transmitted, the base line is changed and the swing width is changed with the swing fulcrum shaft 18a at the upper end as a fulcrum.
That is, as shown in FIG. 4 and schematically shown in FIG. 5, the baseline is driven by the baseline motor 40 by the pulse motor, and the baseline arm 43, the baseline lever 44, the connecting link 45, the needle swing cam lever 46 is driven. The swing is transmitted through the needle swing lever 47, the connecting shaft 48, the needle swing arm 49 and the needle swing cam 54, and the needle bar swing base 18 swings with the swing support shaft 18a at the upper end as a fulcrum. As a result, the baseline is changed. This is the baseline changing mechanism.
As for the swinging width, the swinging width motor 41 is driven by a pulse motor to drive the swinging width arm 55, the swinging width lever 56, the connecting link 45, the needle swinging cam lever 46, the needle swinging lever 47, the connecting shaft 48, the needle swinging arm. The swing is transmitted through 49 and the needle swing cam 54, and the needle bar swing base 18 swings with the swing support shaft 18a at the upper end as a support, thereby changing the swing width. This is the needle swing width changing mechanism.
[0020]
Here, the needle swing mechanism 42 swings (increases) the swing width to the left with reference to the base line position. As shown in FIG. 6A, the cam top of the needle swing cam 54 is on the base line side (the right side in the figure). ), The needle drop is determined by the position of the base line arm 43.
Further, as shown in FIG. 6B, when the cam top of the needle swing cam 54 is on the cam swing width side (left side in the figure), the needle drop is determined by the swing width amount with respect to the base line position. Yes.
Then, the movement of the base line position is performed by the rotation of the base line arm 43 as shown in FIG.
Further, as shown in FIG. 8, the swing width is changed through the base line lever 44 by the rotation of the swing width arm 55.
At the time of sewing, the needle swing cam 54 provided on the auxiliary shaft 53 to which the rotation is transmitted from the upper shaft 6 rotated by driving of the sewing machine motor 5 through the reduction gears 51 and 52 rotates at a reduction ratio of 1/2. The needle swing cam lever 46 engaged with the cam engaging recess 46b reciprocally swings, and the reciprocating motion of the needle swing cam lever 46 is the needle swing lever 47, the connecting shaft 48, the needle swing arm. 49 and the needle swing cam 54 are transmitted to the needle bar rocking base 18.
As a result, based on the change in the base line and the swing width described above, the needle bar rocking base 18 reciprocally rocks with the rocking fulcrum shaft 18a at the upper end as a fulcrum, so that the buttonhole parallel part (side stitching part) And the seam of the tacking part (tacking stitch part) is formed.
[0021]
Next, FIG. 9A shows the names of the buttonhole over stitched portions. As shown in the figure, the left and right buttonholes are the left parallel portion (left stitched portion) and the right parallel portion (right stitched portion). The front and back of the button hole are a first barb fastening portion (rear barb sewing portion) and a second barb fastening portion (front barb sewing portion).
As shown in FIG. 9 (b), such a buttonhole overlock sewing is started with the buttonhole sewing machine having the above-described configuration, and the left parallel portion ( Return to the left stitching portion), the first tacking portion (rear tacking stitching portion), the right parallel portion (right stitching portion) and the second tacking portion (front tacking stitching portion).
[0022]
In the case of the buttonhole sewing machine of this embodiment, the cloth cutting knife 16 is moved up and down a plurality of times during buttonhole sewing by driving the air cylinder unit 30 for the cloth cutting knife shown in FIG. The button hole is formed.
That is, for example, as shown in FIG. 11 (a), the cloth is cut once by the first descending operation of the cloth cutting knife 16, and then the cloth is fed in the direction of the arrow as shown in FIG. 11 (b). Then, as shown in FIG. 11C, the cloth cutting knife 16 is lowered again to form a button hole having a predetermined length.
[0023]
Next, the control method will be described.
"control method"
The above buttonhole sewing machine is controlled according to the control block diagram shown in FIG.
That is, as shown in the figure, the CPU 100 is connected to the ROM 101, RAM 102, Y feed counter 103, baseline feed counter 104, needle swing feed counter 105, cloth cutting knife counter 106, thread trimming feed counter 107, interrupt controller via a bus. 108 and an I / O interface 109 are connected.
The CPU 100 includes various control units and calculation units, that is, a sewing machine control unit, a sewing machine driving speed determination unit, a base line and needle swing width change amount correction unit, a stitch formation order designation unit, a sewing data reading unit, a sewing unit, Start designation means, knife control means, knife vertical movement timing determination means including knife lowering timing determination means, vertical movement timing interval determination means thereof, side sewing length changing means, side sewing width changing means, needle entry control means, pattern enlargement -Reduction reference point determination means, various drive control means, and the like are included.
[0024]
The ROM 101 stores a control program and default, and stores, for example, a storage unit that stores a sewing mode, a hook alignment mode, and a threading mode.
The RAM 102 stores various variables for control, for example, sewing data, baseline / needle swing data, and the like.
The Y feed counter 103, the baseline feed counter 104, the needle swing feed counter 105, the cloth cutting knife counter 106, and the thread trimming feed counter 107 write each count value and write a counter start command, so that time elapses in proportion to the count value. Thereafter, the counter output is repeated at a constant period until a one-pulse count signal is output and a counter stop command is written. The interrupt controller 108 is for the CPU 100 to automatically execute an interrupt process corresponding to each interrupt signal in response to each interrupt signal input. The I / O interface 109 is used by the CPU 100 to interface with an external input / output device.
Each count output of the Y feed counter 103, the baseline feed counter 104, the needle swing feed counter 105, the cloth cutting knife counter 106, and the thread trimming feed counter 107 is connected to the interrupt controller 108, and the count output of each counter is The interrupt process corresponding to each counter is executed.
[0025]
In FIG. 12, an operation panel 110 includes a display unit and various keys as shown in FIG. 13, and is used by an operator to perform various settings / operations necessary for sewing.
The Y-feed pulse motor driver 111 uses the Y-feed counter output signal of the Y-feed counter 103 and the Y-feed direction +/- signal from the I / O interface 109 for one pulse for one counter output in the Y-feed direction. The Y feed pulse motor (said feed motor) 20 is rotated according to +/-.
The base line feed pulse motor driver 112 uses the base line feed counter output signal of the base line feed counter 104 and the base line feed direction +/− signal from the I / O interface 109 to generate one pulse in the base line feed direction with one counter output. The baseline feed pulse motor (baseline motor) 40 is rotated according to +/−.
The needle swing pulse motor driver 113 uses the needle swing counter output signal of the needle swing counter 105 and the needle swing feed direction +/− signal from the I / O interface 109 for one pulse at one counter output. The needle swing pulse motor (the swing width motor) 41 is rotated according to +/− in the swing direction.
[0026]
The sewing machine motor driver 115 rotates the sewing machine motor 5 at a predetermined number of revolutions when the sewing machine is started, and detects the needle up position sensor 116 when the sewing machine is stopped, based on the sewing machine start / stop signal and the sewing speed signal from the I / O interface 109. Based on this, the sewing machine motor 5 is stopped by a known fixed position stop means. The needle upper position sensor 116 detects the upper position of the needle bar 8. The upper position detection output of the needle upper position sensor 116 is used as a needle count input.
The sewing machine motor driver 115 outputs a state indicating whether the sewing machine is stopped or rotating to the I / O interface 109 as a sewing status stop / rotating signal, and outputs a signal from the needle up position sensor 116 as an interrupt controller. It outputs to 108 as a needle up position interruption signal.
Further, the sewing machine motor driver 115 sends signals from the feed reference position sensor 117 and the TG (tacho generator) generator 118 to the interrupt controller 108 as a feed reference interrupt and a TG interrupt, respectively. The feed reference position sensor 117 is used for feed control of a Y feed motor / baseline feed motor / needle swing feed motor or the like. The TG generator 118 generates a square wave of 24 divisions during one rotation of the sewing machine motor.
A signal from the sewing machine motor encoder 119 is fed back.
[0027]
The presser lifting solenoid drive circuit 121 drives the presser lifting solenoid 122 by a presser lowering / raising signal from the I / O interface 109.
The cloth cutting knife lowering cylinder drive circuit 123 drives the cloth cutting knife lowering cylinder (the air cylinder unit for the cloth cutting knife) 30 in accordance with the cloth cutting raising / lowering signal from the I / O interface 109.
The Y feed origin sensor is for detecting the origin position of the Y feed pulse motor 20, and is the feed origin detection sensor 26.
The baseline feed origin sensor is for detecting the origin position of the baseline feed pulse motor 40 and is the baseline origin detection sensor 57.
The needle swing feed origin sensor is for detecting the origin position of the needle swing feed pulse motor 41, and is the swing width origin detection sensor 58.
The presser switch 124 is an operation switch for the operator to raise / lower the presser foot 15 when setting a work, and is related to the stepping operation of the sewing pedal.
The start switch 125 is an operation switch for an operator to start sewing when a work is set, and relates to a stepping operation of the sewing pedal.
[0028]
The needle swing left / right detection switch is the needle swing left / right position detection sensor 59.
The knife up / down detection switches are the cloth cutting knife up / down position detection sensors 34a, 34b.
The operation panel 110 includes various keys and a display unit as shown in FIG.
That is, the sewing key 131, the LED display unit 132 for displaying that the sewing mode 131 is pressed and the sewing mode is turned on, the selection key 133, and the selection key 133 are lighted sequentially each time the selection key 133 is pressed. No. , Parameter no. LED display sections 134, 135, 136, 137, and 138 for displaying setting modes for speed, threading, and hook alignment.
Further, a pattern display unit 141 using a 2-digit LED 7 segment, a numerical display unit 140 using a parameter display unit 142 using a 4-digit LED 7 segment, and a minus key 143 and a plus key for increasing / decreasing the numerical value of the numerical display unit 140 by ± 1. There are provided a key 144, a down key 145 and an up key 146 for increasing / decreasing a numerical value of the numerical value display unit 140 by a predetermined unit, and a set key 147 as a threading switch or a hook alignment switch.
Since the above-described various keys are provided, the operation panel 110 has a button hole / female blade length setting unit, a button hole forming width direction position setting unit, a button hole overhanging stitch left / right direction position setting unit, and a bar clamp. It also has functions as an interval setting means between the sewing portion and the button hole end, left and right sewing portion individual setting means, pattern enlargement / reduction setting means, stitch number / constant pitch selection means, and the like.
[0029]
Next, specific control will be described with reference to FIG. 14 showing a general flow for performing control based on the control block shown in FIG.
As described above, the following control includes various control units (sewing machine control means, sewing machine driving speed determination means, base line and needle swing width change amount correction means, stitch formation order designation means, sewing data reading means, sewing start position, Start specifying means, knife control means, knife vertical movement timing determination means including knife lowering timing determination means, vertical movement timing interval determination means, side sewing length changing means, side sewing width changing means, needle entry CPU 100 including control means, pattern enlargement / reduction reference point determination means, various drive control means, etc.) and calculation means, and control including, for example, a storage unit that stores a sewing mode, a hook alignment mode, and a threading mode. ROM101 that stores programs and defaults for, and various variables for control including, for example, sewing data, baseline / needle swing data, etc. It is carried out with a transmission and reception of the signal of the RAM102 you are. In addition, as described above, the CPU 100 sets the button hole / female blade length setting means, the button hole forming width direction position setting means, the interval setting means between the tack stitch portion and the button hole end, and the pattern enlargement / reduction setting means. Further, predetermined control is performed by a signal input from the operation panel 110 which also has a function as a needle number / pitch constant selection means or the like.
[0030]
As shown in the general flow of FIG. 14, when the power is turned on, first, an operation panel setting process is called in step S <b> 1, and various setting processes by the operation panel 110 are performed. Various setting operations using the operation panel 110 are performed until the sewing key 131 is turned on in the next step S2. After the sewing key 131 is turned on, a sewing data creation process is called in the next step S3, and the sewing data is stored. Created. If the sewing key 131 is not on in step S2, the process returns to step S1.
After the sewing data is created, the lowering of the presser foot 15 is output in the next step S4, and then the machine origin search process is called in the next step S5, and the Y feed pulse motor 20 / baseline feed pulse motor 40 / needle is called. The mechanical origin search of the swing pulse motor 41 is performed. Subsequently, in the next step S6, the sewing start movement is called and the Y feed pulse motor 20, the baseline feed pulse motor 40 / the needle swing feed pulse motor 41 are driven to the sewing start position, and then in the next step S7, the presser foot is moved. The output is increased by 15, and the process proceeds to the next step S8.
[0031]
In step S8, the sewing key 131 is checked, and when the sewing key 131 is turned on, the process returns to the step S1 and the operation panel setting process is performed again. If the sewing key 131 is not turned on, the next step Proceed to S9. In step S9, the presser switch 124 is checked. When the presser switch 124 is on, the process proceeds to the next step S10, and when the presser switch 124 is not on, the process returns to step S8.
In step S10, it is determined whether or not the presser foot 15 is being lifted. If the presser foot 15 is being lifted, a downward output of the presser foot 15 is performed in the next step S11. If not being lifted, step S12 is performed. Then, the output of the presser foot 15 is raised and the process returns to step S8.
After the presser foot lowering output, in the next step S13, the presser switch 124 is checked. When the presser switch 124 is turned on, the presser foot 15 is raised in step S12, and the process returns to step S8. If the presser switch 124 is not turned on, the process proceeds to the next step S14. In step S14, the start switch 125 is checked. When the start switch 125 is on, the process proceeds to the next step S15, and when the start switch 125 is not on, the process returns to step S13.
In step S15, a sewing process is called and sewing is started. After the end of sewing, in the next step S16, the output of the presser foot 15 is raised, and the process returns to step S8.
[0032]
Next, the operation panel setting process (step S1), sewing data creation (step S3), machine origin search (step S5), and sewing (step S15) in the above general flow will be described in detail.
FIG. 15 shows a subroutine of the operation panel setting process (step S1). First, in step S101, the selection key 133 is checked. When the selection key 133 is on, the selection number is set in the next step S102. 1 is incremented, and the process proceeds to the next step S103. If the selection key 133 is not on, the process proceeds to step S105 as it is.
In step S103, the selection number is checked. If the selection number exceeds the maximum number “4”, “0” is set back to the selection number in the next step S104, and the process proceeds to the next step S105. If the selection number is not more than the maximum number “4”, the process proceeds to step S105 as it is.
In step S105, it is determined whether or not the selection number is “0”. If it is “0”, the process proceeds to step S106 to perform pattern change processing, and then the above-described step S2 of the general flow (FIG. 14). If not "0", the process proceeds to step S107.
[0033]
In step S107, it is determined whether or not the selection number is “1”. If it is “1”, the process proceeds to step S108, and after performing the parameter changing process, step S2 of the general flow (FIG. 14). If not “1”, the process proceeds to step S109.
In step S109, it is determined whether or not the selection number is “2”. If it is “2”, the process proceeds to step S110 to perform speed change processing, and then the step S2 of the general flow (FIG. 14). If not "2", the process proceeds to step S111.
In step S111, it is determined whether or not the selection number is “3”. If it is “3”, the process proceeds to step S112 to set the threading mode, and then the step S2 of the general flow (FIG. 14). If not “3”, the process proceeds to step S113.
In step S113, it is determined whether or not the selection number is “4”. If it is “4”, the process proceeds to step S114 to set the hook alignment mode, and then the step S2 of the general flow (FIG. 14). If not "4", the process proceeds to step S2.
[0034]
Next, the parameter change process (step S108) in the operation panel setting process (step S1) will be described in detail.
Here, prior to the description of the processing, the setting item chart shown in FIG. 16 and the specifications shown in FIG. 17 will be described.
In the setting item chart shown in FIG. 16, pattern numbers “1” to “6” in which various parameters are set in advance are provided, and parameter numbers “1” to “19” for changing and setting from the pattern as necessary. The setting items corresponding to "Cut length", "Wife width", "Feeling length", "Fitting width", "Parallel part pitch", "Fitting part pitch", "Gap between the cloth cutting knife and the first tacking clearance" "Spacing length" between the cloth cutting knife and the second bar clamp, "Left position of knife drop", "Tension of parallel part", "Tension of bar clamp", "Tension at the start of sewing", "Tension at the end of sewing", "Size of cloth cutting knife" “Presser size”, “Enlargement / reduction ratio”, “Number of stitches at the time of enlargement / reduction”, “Number of knife drop timing correction stitches”, “Speed during knife driving” are provided and stored in the RAM 102. Each pattern number stores a default stored in the ROM 101.
A setting range and its unit are provided corresponding to each parameter number and setting item.
Further, as shown in the specifications shown in FIG. 17, regarding the buttonhole overhang, the cloth cutting length a, the knife width b, the tacking length c, the tacking width d, the parallel part pitch e, the tacking part pitch f, Set the knife-first tacking clearance g and the knife-second tacking clearance h.
In the RAM 102, each parameter is set and a pattern number is registered and set, and the parameter is used corresponding to the pattern number and changing the parameter as necessary.
[0035]
FIG. 18 shows a subroutine for parameter change processing (step S108). First, in step S1081, the plus key 144 is checked. When the plus key 144 is on, the parameter number is set to 1 in the next step S1082. Is incremented, and the process proceeds to the next step S1083. If the plus key 144 is not on, the process proceeds to step S1085 as it is.
In step S1083, the pattern number is checked. If the parameter number exceeds the maximum number “19”, the parameter number is set to “1” in the next step S1084, and then the process proceeds to the next step S1085. If the parameter number is equal to or less than the maximum number “19”, the process proceeds to step S1085.
In step S1085, the minus key 143 is checked. When the minus key 143 is on, the parameter number is decremented by 1 in the next step S1086, and the process proceeds to the next step S1087, and the minus key 143 is turned on. If not, the process proceeds to step S1089.
In step S1087, the parameter number is checked. If the parameter number is less than the minimum number “1”, the maximum number “19” is set in the parameter number in the next step S1088, and then the process proceeds to the next step S1089. If the parameter number is not less than the minimum number “1”, the process directly proceeds to step S1089.
In step S1089, a desired data change process corresponding to the parameter number is performed by operating the down key 145 or the up key 146, and then the process proceeds to step S2 of the general flow (FIG. 14).
[0036]
FIG. 19 shows a subroutine for creating sewing data (step S3). First, enlargement / reduction processing is performed in step S31, and then the size of the presser foot 15 and the cloth cutting knife 16 is performed in the next step S32. Then, a size error is checked in the next step S33.
If the relationship between the presser foot 15 and the cloth cutting knife 16 is a size error, the process proceeds directly to step S34 to display an error, and then proceeds to step S4 in the general flow (FIG. 14). If the relationship between 15 and the cloth cutting knife 16 is not a size error, in the next step S37, the switch (not shown) provided on the operation panel 114 for selecting the clockwise or counterclockwise sewing is determined. Proceed to step S35 or step S38.
In step S35 or S38, each pattern calculation is performed. Subsequently, in step S36, the knife drive timing calculation is performed, and then the process proceeds to step S4 in the general flow (FIG. 14). That is, if it is determined in step S37 that the sewing is performed clockwise, the clockwise pattern is calculated in step S33, while if it is determined that the sewing is not performed clockwise, the counterclockwise pattern is determined in step S38. Perform the operation.
[0037]
Next, the pattern calculation (step S35) processing in the above sewing data creation (step S3) will be described in detail.
FIG. 20 shows a subroutine of enlargement / reduction processing (step S31). Here, in order to enlarge / reduce buttonhole sewing, as shown in FIG. 21 (a), the enlargement / reduction process is performed. With reference point P as the front end of cloth cutting knife 16, as shown in FIG. 21 (b), parallel part pitch e and tacking part pitch f, and / or cloth cutting length a, knife width b, collar Control is performed to enlarge or reduce the set values of the stop length c and the tacking width d.
In this sewing data creation, as shown in FIG. 20, first, in step S311, an enlargement / reduction ratio is set to α, and then in the next step S312, it is determined whether the number of stitches is constant or not. If the number is constant, the process proceeds to step S313. If the number of stitches is not constant, the process proceeds to step S314.
In step S313, the parallel part pitch × α and the tacking part pitch × α in the chart of FIG. 16 are set as the set values of “parallel part pitch e” and “fastening part pitch f”, respectively, and then the next step The process proceeds to S314.
In step S314, the cloth cutting length × α and the knife width in the chart of FIG. 16 are set as the setting values of “cloth cutting length”, “female width”, “fastening length”, and “fastening width”, respectively. 19 after setting α ×, bar clamp length × α, bar clamp width × α, female-first bar clamp length g × α, female-second bar clamp length h × α. Proceed to step S32.
[0038]
FIG. 22 shows a subroutine for the pattern calculation (step S35). First, the sewing start position is calculated in step S351, and then the left parallel portion is calculated in the next step S352. In the next step S353, the first tacking unit is calculated.
Then, in the next step S354, the calculation of the right parallel portion is performed. Subsequently, in the next step S355, the calculation of the second tacking portion is performed, and in the next step S356, the calculation of the sewing end is performed. The process proceeds to step S36 in the flow of FIG.
[0039]
Next, the sewing start position calculation (step S351), the left parallel part calculation (step S352), the first tacking part calculation (step S353), the right parallel part calculation (step S354) in the above pattern calculation (step S35), Each process of the second tacking portion calculation (step S355) and the sewing end calculation (step S356) will be sequentially described in detail.
Here, prior to the description of each calculation process, the sewing order and each item will be described.
FIG. 23 shows the sewing sequence. FIG. 23 (1) shows the movement from the machine origin to the sewing start position, FIG. 23 (2) shows the sewing of the left parallel portion, and FIG. Up to the middle of the sewing of the stopper part, Fig. 23 (4) is the end of sewing of the first ratchet part, Fig. 23 (5) is the start of sewing of the right parallel part, Fig. 23 (6) is the sewing of the right parallel part, Fig. 23 ▲ 7 ▼ indicates the start of sewing of the second tacking portion, FIG. 23 (8) indicates the middle of the sewing of the second tacking portion, and FIG. 23 (9) indicates the end of sewing (end of sewing of the second tacking portion). Yes. The movement to the machine origin is performed only when the sewing mode is switched.
FIG. 24 is a chart showing the sewing data calculation result, which is obtained by calculation shown in FIGS. 25 and 31 described later. In this chart, N is the number of repetitions (number of stitches), Y is Y feed, K is the base line, H is the swing width, and T is the thread tension value. Each subscript is the sewing shown in FIG. This corresponds to the order (data pointer) (1), (2), (3), (4), (5), (6), (7), (8), and (9).
In the following calculation, dimensions based on the specifications shown in FIG. 17 (cloth cutting length a, knife width b, tacking length c, tacking width d, parallel part pitch e, tacking part pitch f) , Female-first tacking clearance g, female-second tacking clearance h).
The above sewing data calculation results are stored in the RAM 102.
[0040]
FIG. 25 shows a subroutine for the sewing start position calculation (step S351). First, in step S3511, Y₁= C / 2 is calculated, and then in the next step S3512, K₁= B / 2 is calculated, and then in the next step S3513, H₁= (D−b) / 2 is calculated, and then, in the next step S3514, T₁= Set “sewing start tension”.
Then, in the next step S3515, it is determined whether the panel setting value of “knife falling left / right position” is 0. If it is 0, the process proceeds to step S352 of the flow of FIG. In step S3516, K₁= K₁+ After the “knife falling left / right position” is set, the process proceeds to step S352.
Sewing start position (K₁) To provide a knife width position adjustment function centered on the “knife drop position”, so that the center position in the left-right direction of the stitch shape becomes the knife drop position as shown in FIG.
[0041]
FIG. 27 shows a subroutine of left parallel part calculation (step S352). First, in step S3521, Y₂= E is set, and then in the next step S3522, N₂= {A + h + g + (c / 2)} / e is calculated. In this arithmetic expression, by changing h and g without changing a, it is possible to correct the interval between the tack-fastening portion and the button hole end portion.
Then, in the next step S3523, K₂= 0 is set, and then in the next step S3524, H₂= 0, and then in the next step S3525, T₂= After setting “parallel section tension”, the process proceeds to step S353 in the flow of FIG.
[0042]
FIG. 28 shows a subroutine of the first tacking portion calculation (step S353). First, in step S3531, Y_Three= F, and then in the next step S3532, N_Three= C ÷ f is calculated, and then in the next step S3533, K_Three= {(B + d) / 2} / N_ThreeThen, in the next step S3534, H_Three= {(D + b) / 2} / N_ThreeIs calculated.
Subsequently, in the next step S3535, T_Three= After setting “tacking portion tension”, in the next step S3536, Y_Four= F is set, and then in the next step S3537, N_Four= C ÷ f is calculated.
Then, in the next step S3538, K_Four= 0 is set, and then in the next step S3539, H_Four= 0, and then in the next step S3540, T_Four= After setting “tacking portion tension”, the process proceeds to step S354 in the flow of FIG.
[0043]
FIG. 29 shows a right parallel part calculation (step S354) subroutine. First, in step S3541, N_Five= 1 is set, and then, in the next step S3542, Y_Five= 0, then in the next step S3543, K_Five= 0 is set. Subsequently, in the next step S3544, H_Five= (D + b) / 2, and then in the next step S3545, T_Five= Set “Parallel section tension”.
Then, in the next step S3546, Y₆= E is set, and then in the next step S3547, N₆= (A + h + g) ÷ e is calculated. Subsequently, in the next step S3548, K₆= 0, and then in the next step S3549, H₆= 0, and then in the next step S3550, T₆= "Parallel part tension" is set, and then the process proceeds to step S355 in the flow of FIG.
[0044]
FIG. 30 shows a subroutine for the second tacking portion calculation (step S355). First, in step S3551, N₇= 1 is set, and then, in the next step S3552, Y₇= 0, and then in the next step S3553, K₇= 0 is set. Subsequently, in the next step S3554, H₇= (D + b) / 2, and then in the next step S3555, T₇= Set “tack stop tension”.
In the next step S3556, Y₈= F is set, and then in the next step S3557, N₈= C ÷ f is calculated. Subsequently, in the next step S3558, K₈= 0, and then in the next step S3559, H₈= 0, and then in the next step S3560, T₈= After setting “tacking portion tension”, the process proceeds to step S356 in the flow of FIG.
[0045]
FIG. 31 shows a subroutine for the sewing end calculation (step S356). First, in step S3561,₉= F is set, and then in the next step S3562, N₉= (C / 2) ÷ f, then, in the next step S3563, K₉= (B + d) / 2 ÷ N₉Is calculated.
Then, in the next step S3564, H₉= (D + b) / 2 ÷ N₉Then, in the next step S3565, T₉= “End tension at sewing” is set, then, in the next step S3566, the total number of stitches N =⁹Σ_{n = 2}N_nThen, the process proceeds to step S36 in the flow of FIG.
[0046]
Next, FIG. 32 shows a subroutine for mechanical origin search (step S5). First, in step S51, the Y feed pulse motor 20 is driven while checking the Y feed origin sensor 26, and the Y feed pulse is checked. The origin position of the motor 20 is searched. After searching the origin of the Y feed pulse motor 20, 0 is set to the Y feed position in the next step S52.
Subsequently, in the next step S53, the baseline feed pulse motor 40 is driven while checking the baseline feed origin sensor 57 to search the origin position of the baseline feed pulse motor 40, and in the next step S54, Set 0 to the baseline feed position.
Then, in the next step S55, the needle swing pulse motor 41 is driven while checking the needle swing origin sensor 58 to search the origin position of the needle swing feed motor 41, and in the next step S56. Then, after setting 0 to the needle swing position, the process proceeds to step S6 of the general flow (FIG. 14).
[0047]
Next, FIG. 33 shows a subroutine for sewing (step S15). First, in step S151, the total number of stitches is set as the number of remaining stitches. Subsequently, in the next step S152, a needle swinging left / right detection sensor is set. While checking 59, it is determined whether or not the current needle swing position is on the right side (baseline side). If it is on the right side, the sewing machine activation output is performed in the next step S153, and then the process proceeds to the next step S155.
On the other hand, if the current needle swing position is not on the right side, the process proceeds to step S154, the sewing machine start output is performed, and then the process proceeds to the next step S156.
In step S155, it is determined from the pulse from the sewing machine motor encoder 119 whether or not the sewing machine status is rotating. If it is rotating, the process proceeds to the next step S158, and if not rotating, the process returns to step S155. .
Also in step S156, it is determined from the pulse from the sewing machine motor encoder 119 whether or not the sewing machine status is rotating. If it is rotating, the process proceeds to the next step S157, and if it is not rotating, step S156 is performed. Return to. Subsequently, in step S157, it is determined whether or not there is a needle up position interrupt request to the interrupt controller 108 while checking the needle up position sensor 116. If yes, the process proceeds to the next step S158. If there is no position interrupt request, the process returns to step S157.
[0048]
In step S158, it is determined whether or not the sewing machine status is a rotation based on a pulse from the sewing machine motor encoder 119. If the sewing status is a rotation, the process proceeds to the next step S159. ) Proceeds to step S16.
In step S159, it is determined whether or not there is a TG interrupt request to the interrupt controller 108 while checking the TG generator 118. If there is, a TG interrupt process is performed in step S160 and then the next step S161 is performed. If there is no TG interrupt request, the process proceeds directly to step S161.
In step S161, it is determined whether or not there is a needle up position interrupt request to the interrupt controller 108. If there is, a needle up position interruption process is performed in step S162, and then the process proceeds to the next step S163. If there is no upper position interrupt request, the process proceeds directly to step S163.
In step S163, it is determined whether or not there is a feed reference interrupt request to the interrupt controller 108 while checking the feed reference position sensor 117. If there is, a feed reference interrupt process is performed in step S164 and the next step is performed. The process proceeds to step S165, and if there is no feed reference interrupt request, the process proceeds to step S165 as it is.
Subsequently, in step S165, a cloth cutting knife counter interrupt process is performed, and then the process returns to step S158.
[0049]
Next, FIG. 34 shows a subroutine of the feed reference interrupt process (step S164). First, in step S1641, the rotation direction of the Y feed pulse motor 20 is set, and then in step S1642, the Y direction is set. The number of pulses of the feed pulse motor 20 is set.
Subsequently, after setting the rotational direction of the baseline feed pulse motor 40 in the next step S1643, the number of pulses of the baseline feed pulse motor 40 is set in the next step S1644.
Subsequently, after setting the rotational direction of the needle swing pulse motor 41 in the next step S1645, the number of pulses of the needle swing pulse motor 41 is set in the next step S1646.
Then, in the next step S1648, 1 is decremented from the number of repetitions.
Subsequently, in the next step S1649, it is checked whether or not the number of repetitions is 0. If it is 0, the data pointer is incremented by 1 in the next step S1700, and then the data in the next step S1701. After setting the number of repetitions for the pointer, the process proceeds to step S165 in the flow of FIG.
If it is determined in step S1649 that the number of repetitions is not zero, the process proceeds to step S165 as it is.
[0050]
In the buttonhole sewing machine according to the present embodiment having the above control method, it will be described based on the buttonhole sewing in the sewing order (data pointer) (1) to (9) shown in FIG. After the operator sets each numerical value on the operation panel 110, the sewing start position point P in FIG.₁The presser foot 15 is stopped in the lowered state. When the start switch is operated by the operator, “sewing” in step S15 starts.
By this sewing subroutine, the left stitch (left parallel portion) corresponding to the data pointer {circle over (2)} is started, and the operation of each pulse motor based on each pulse setting by the feed reference interrupt processing S164 is performed at the timing by the TG interrupt processing S160. When it is determined that the number of repetitions in the same feed reference interrupt processing is 0 (step S1649), that is, when the number of stitches (number of stitches) reaches a predetermined value, the data pointer is set to (3) (step S1700). Similarly, stitches are formed by TG interrupt processing and feed interrupt processing. Thereafter, the data pointers {circle over (4)} and {circle over (5)} are similarly formed to form the first tack-stop stitching.
In the data pointer {circle over (6)}, that is, during the right side stitching (right parallel stitching), in the knife drive processing routine of the needle up position interrupt processing (step S161), the count value is calculated according to the stitch count value. M_nThen, the cloth cutting knife 16 is lowered by the processing of the cloth cutting knife lowering subroutine. At this time, the sewing machine speed is decelerated to the knife drive speed before or when the cloth cutting knife 16 is lowered by the set value of R in Step S16261 (preset). This operation is repeated a number of times according to the calculated numerical value n (S16265). Further, the repetition interval of the lowering of the cloth cutting knife is determined, and the sewing speed is set according to the determination result (steps S16251 to S16260).
In the needle up position interrupt processing at the data pointer {circle over (9)}, when the number of remaining stitches becomes zero at P9, that is, at the sewing start position P1, that is, when the buttonhole sewing is completed, a sewing machine stop output is output and a conventionally known fixed position is obtained. The sewing machine is stopped at the needle up position by the stopping means.
[0051]
<Example of control method change>
As another example of the pattern calculation subroutine, in the following calculation, dimensions (cloth cutting length a, left knife width b) based on the specifications shown in FIG.₁, Right knife width b₂, Bar tacking length c, bar tacking width d, parallel part pitch e, bar tacking section pitch f, knife-first bar tacking gap g, knife-second bar tacking gap h).
Also, the setting item chart shown in FIG. 36 is the same as the chart of FIG.₁”And“ Right knife width b ”₂"And the female scalpel left and right position" are deleted.
[0052]
FIG. 37 shows a subroutine for sewing start position calculation (step S381). First, in step S3811, Y₁= C / 2 is calculated, and then in the next step S3812, K₁= B₁Then, in the next step S3813, H₁= {D- (b₁+ B₂)} / 2, and in the next step S3814, T₁= After setting “sewing start tension”, the process proceeds to the next right parallel part calculation (step S382). And b₁And b₂By separately specifying, the distance from the knife drop point to the left and right stitches can be adjusted separately.
[0053]
FIG. 38 shows a subroutine of the right parallel part calculation (step S382). First, in step S3821, N_Five= 1 is set, and then, in the next step S3822, Y_Five= 0, and then in the next step S3823, K_Five= 0 is set. Subsequently, in the next step S3824, H_Five= (D + b₁+ B₂) / 2, and then in the next step S3825, T_Five= Set “Parallel section tension”.
Then, in the next step S3826, Y₆= E is set, and then in the next step S3827, N₆= (A + h + g) ÷ e is calculated. Subsequently, in the next step S3828, K₆= 0, and then in the next step S3829, H₆= 0, and then in the next step S3530, T₆= After setting “parallel section tension”, the process proceeds to the next first tacking section calculation (step S383).
[0054]
FIG. 39 shows a subroutine for the first tacking portion calculation (step S383). First, in step S3831, Y_Three= F is set, and then in the next step S3832, N_Three= C ÷ f is calculated, and then in the next step S3833, K_Three= {(B₁+ B₂+ D) / 2} ÷ N_ThreeThen, in the next step S3834, H_Three= {(D + b₁+ B₂) / 2} ÷ N_ThreeIs calculated.
Subsequently, in the next step S3835, T_Three= After setting the “tacking portion tension”, in the next step S3836,_Four= F is set, and then in the next step S3837, N_Four= C ÷ f is calculated.
Then, in the next step S3838, K_Four= 0, and then in the next step S3839, H_Four= 0, and then in the next step S3840, T_Four= After setting “tacking part tension”, the process proceeds to the second tacking part calculation (step S385) following the next left parallel part calculation (step S384).
[0055]
FIG. 40 shows a subroutine for the second tacking portion calculation (step S385). First, in step S3851, N₇= 1 is set, and then, in the next step S3852, Y₇= 0, and then in the next step S3853, K₇= 0 is set. Subsequently, in the next step S3854, H₇= (D + b₁+ B₂) / 2, and in the next step S3855, T₇= Set “tack stop tension”.
In the next step S3856, Y₈= F is set, and then in the next step S3857, N₈= C ÷ f is calculated. Subsequently, in the next step S3858, K₈= 0, and then in the next step S3859, H₈= 0, and then in the next step S3860, T₈= After setting “tack stop portion tension”, the process proceeds to the next sewing end calculation (step S386).
[0056]
FIG. 41 shows a subroutine for the sewing end calculation (step S386). First, in step S3861,₉= F, and then in the next step S3862, N₉= (C / 2) ÷ f, then, in the next step S3863, K₉= (B₁+ B₂+ D) / 2 ÷ N₉Is calculated.
Then, in the next step S3864, H₉= {D- (b₁+ B₂)} / 2 ÷ N₉Then, in the next step S3865, T₉= “End tension at sewing” is set, then, in the next step S3866, the total number of stitches N =⁹Σ_{n = 2}After calculating Nn, the process proceeds to step S36 in the flow of FIG.
[0057]
<Another embodiment>
As still another embodiment, FIG. 42 shows a configuration in which a feed sensor and a knife dropping switch are provided in order to take the operation timing of the cloth cutting knife from the Y feed. On the fixed bracket 23, the detection plate 161 is fixed vertically with the plate surface facing sideways, and the sewing movement position for detecting the forward or backward feed direction based on the Y-direction movement position of the detection plate 161 is detected. Proximity type feed sensors 162 as detection means are arranged opposite to each other in the moving direction of the detection plate 161.
Then, a pair of front and rear projections 163 and 163 are formed on one side surface of the detection plate 161, and the knife drop switch 164 is pressed by either one of the pair of front and rear projections 163 or 163. , 163 are arranged opposite to the movement path. That is, in the illustrated example, each time the knife dropping switch 164 is pushed by the two front and rear protrusions 163 and 163, the air cylinder unit 30 for the cloth cutting knife is driven to move the cloth cutting knife 16 up and down twice. It is something to move.
In this embodiment, the knife drop switch 164 is a knife lowering start timing setting means.
[0058]
In each of the above embodiments, the buttonhole sewing machine is used. However, the present invention is not limited to this, and other needle swing sewing machines may be used.
In addition, it is needless to say that other specific detailed structures can be appropriately changed.
For example, in place of needle up position detection, needle down position detection or other phase detection may be used.
Further, in the present embodiment, the parameters are calculated and set to set the knife drive timing or each dimension of the button hole shape, etc. The same effect can be obtained even if it is carried out in a device that reads out the data. Alternatively, a calculation once set may be stored and selectively read out.
Further, the vertical axis of the sewing machine may be controlled to rotate separately by a separate motor.
[0059]
【The invention's effect】
  As described above, according to the buttonhole sewing machine according to the first aspect of the present invention, the knife dropping position is set according to the setting of the setting means.Based onSince the buttonhole stitches can be moved in the left-right direction to adjust the distance between the buttonhole and the left and right stitching portions, the distance from the buttonhole to the inner edge of the left and right stitching portion can be made equal to the left and right.
  Accordingly, the buttonhole stitches can be finished with a good appearance.
[0060]
  According to the buttonhole sewing machine according to the invention of claim 2, the knife dropping position is set by the setting means.Based onThe width between the left and right side sewing parts can be adjusted individually by setting the width to the left and right side sewing part inner edges separately, so the distance from the button hole to the left and right side sewing parts inner edge is made equal to the left and right sides. Can do.
  Accordingly, the buttonhole stitches can be finished with a good appearance.
[0061]
According to the buttonhole sewing machine according to the third aspect of the invention, in addition to the effect obtained by the second aspect of the invention, the individual widths of the left and right side sewn portion inner edges with respect to the knife dropping position by the setting means According to the setting, there is an advantage that the changing means can change the distance from the knife dropping position to the inner edge of the left and right side stitching portions without changing the width of the buttonhole stitching seam, that is, the width of the barbed portion.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of a buttonhole sewing machine as an example to which the present invention is applied.
FIG. 2 is a schematic perspective view of an internal mechanism according to a first embodiment.
FIG. 3 is a schematic perspective view of an internal mechanism, showing a state viewed from the side opposite to FIG. 2;
4 is a front view of the needle swing mechanism of FIG. 3 as viewed from the needle side.
5 is a schematic diagram for explaining the operation of the needle swing mechanism of FIG. 4;
6A and 6B show an example of the operation of the needle swing mechanism. FIG. 6A is a diagram showing a state where the cam top of the needle swing cam is on the base line side, and FIG. It is the figure which showed the state in the side.
FIG. 7 is a diagram showing a change in the baseline position by the needle swing mechanism.
FIG. 8 is a diagram showing a change of a swing width position by a needle swing mechanism.
FIGS. 9A and 9B show a buttonhole overhanging portion, in which FIG. 9A is a view showing the name of a buttonhole overturning portion, and FIG. 9B is a view showing a clockwise direction.
FIG. 10 is a perspective view showing a knife driving device.
FIGS. 11A and 11B are diagrams for explaining the vertical movement of the cloth cutting knife twice. FIG. 11A is a diagram showing a state where the cloth cutting knife is once cut by the first lowering operation of the cloth cutting knife, and FIG. The figure which showed the direction, (c) is a figure which shows the 2nd descent | fall operation | movement of the cloth cutting knife.
FIG. 12 is a control block diagram of a buttonhole sewing machine.
FIG. 13 is a front view of an operation panel.
14 is a general flowchart in which control is performed based on the control block of FIG.
FIG. 15 is a flowchart showing a subroutine of operation panel setting processing (step S1).
FIG. 16 is a setting item chart;
FIG. 17 is a diagram showing specifications of a buttonhole overhanging portion.
FIG. 18 is a flowchart showing a subroutine of parameter change processing (step S108).
FIG. 19 is a flowchart showing a subroutine for creating sewing data (step S3).
FIG. 20 is a flowchart showing a subroutine of enlargement / reduction processing (step S31).
FIGS. 21A and 21B are diagrams for explaining enlargement / reduction of buttonhole sewing, in which FIG. 21A is a diagram showing reference points for enlargement / reduction, and FIG. 21B is a diagram showing names of respective parts;
FIG. 22 is a flowchart showing a subroutine of pattern calculation (step S35).
FIG. 23 is a diagram showing a clockwise sewing order.
FIG. 24 is a chart showing sewing data calculation results.
FIG. 25 is a flowchart showing a subroutine for sewing start position calculation (step S351).
FIG. 26 is a diagram illustrating determination of a knife dropping center position.
FIG. 27 is a flowchart showing a subroutine of left parallel part calculation (step S352).
FIG. 28 is a flowchart showing a subroutine of first tacking portion calculation (step S353).
FIG. 29 is a flowchart showing a right parallel portion calculation (step S354) subroutine.
FIG. 30 is a flowchart showing a subroutine of second tacking portion calculation (step S355).
FIG. 31 is a flowchart showing a subroutine for sewing end calculation (step S356).
FIG. 32 is a flowchart showing a subroutine of machine origin search (step S5).
FIG. 33 is a flowchart showing a subroutine for sewing (step S15).
FIG. 34 is a flowchart showing a subroutine of feed reference interrupt processing (step S164).
FIG. 35 is a diagram showing the specifications of a buttonhole portion.
FIG. 36 is a setting item chart;
FIG. 37 is a flowchart showing a subroutine of sewing start position calculation (step S381).
FIG. 38 is a flowchart showing a right parallel part calculation (step S382) subroutine.
FIG. 39 is a flowchart showing a subroutine of first tacking portion calculation (step S383).
FIG. 40 is a flowchart showing a subroutine of second tacking portion calculation (step S385).
FIG. 41 is a flowchart showing a subroutine for sewing end calculation (step S386).
FIG. 42 is a perspective view showing a configuration example in which a feed sensor and a knife dropping switch are provided in order to take the operation timing of the cloth cutting knife from Y feeding.
[Explanation of symbols]
1 Sewing machine frame
2 beds
3 Vertical trunk
4 arms
5 Sewing machine motor
6 Upper shaft
8 needle bar
9 stitches
11 Lower shaft
12 Kettle
14 Cloth holding plate
15 Work clamp
16 Cloth cutting knife (vertical movement knife)
18 Needle bar swing base
19 Thread tension
20 pulse motor (feed motor: electric drive means)
20a pinion
21 Feeding mechanism (connecting means)
22 Feed axis
22a rack
24 Cloth holding arm
30 Air cylinder unit for cloth cutting knife (electric drive means for knife operation)
31 Female mounting plate
34a, 34b Cloth cutting knife vertical position detection sensor (knife vertical position detection means)
40 Baseline motor (baseline change drive means)
41 Swing width motor (drive means for changing needle swing width)
42 Needle swing mechanism
43 Baseline arm
44 Lever for baseline
45 Link
46 Needle swing cam lever
47 Needle swing lever
48 connecting shaft
49 Needle swing arm
54 Needle swing cam
55 Swing arm
56 Swing lever
57 Baseline origin detection sensor (baseline position detection means)
58 Swing width origin detection sensor (Needle width detection means)
59 Needle swing left / right position detection sensor (needle swing left / right position detection means)
60 Voice coil motor
162 Feed sensor (sewing movement position detection means)
164 Knife drop switch (knife descending start time setting means)

Claims (3)

A stitch cutting mechanism that includes a cloth cutting knife that moves up and down with respect to the sewing product to form a button hole, a feed mechanism that can reciprocate the sewing product in a predetermined direction, and a needle swing mechanism that swings the needle in a predetermined direction. By defining the amount of cloth movement in the front-rear direction, the left / right position of the needle, the needle swinging position, and the lowering position of the cloth cutting knife based on previously set data, In a buttonhole sewing machine that forms a buttonhole stitching seam having left and right side stitching portions so that the inner edge is located a predetermined length away from
Providing a setting means for setting the buttonhole stitching to move in the left-right direction on the basis of the lowered position of the cloth cutting knife that forms the buttonhole ;
In accordance with the setting of the setting means, the buttonhole sewing machine is characterized in that the distance between the buttonhole sewing seam in the horizontal direction with respect to the buttonhole can be adjusted by moving the buttonhole sewing seam in the horizontal direction based on the knife drop position. . A stitch cutting mechanism that includes a cloth cutting knife that moves up and down with respect to the sewing product to form a button hole, a feed mechanism that can reciprocate the sewing product in a predetermined direction, and a needle swing mechanism that swings the needle in a predetermined direction. By defining the amount of cloth to be moved in the front-rear direction, the base position of the needle, the needle swing position, and the lowering position of the cloth cutting knife based on previously set data, In a buttonhole sewing machine that forms a buttonhole stitching seam having left and right side stitching portions so that the inner edge is located a predetermined length away from
Provided with a setting means that can set each width with the left and right side sewing portion inner edge with reference to the lowered position of the cloth cutting knife forming the button hole ,
A button characterized in that the setting means can set each width with the inner edge of the left and right side sewing parts based on the knife dropping position, and individually adjust the distance between the button hole and the left and right side sewing parts. A hole sewing machine.   3. The buttonhole sewing machine according to claim 2, further comprising changing means for changing the side sewing width without changing the buttonhole sewing width by setting each width by the setting means.

Images