CN1133770C - Button holing sewing machine - Google Patents

Abstract

To obtain a beautiful seam which does not expose a cloth cut edge outside by sewing the periphery of a button hole at least two rounds by a sewing means and controlling a cloth cutter to be actuated to cut the button hole part at the first round of sewing and not to actuate the cloth cutting knife in the second round of sewing and later. This buttonhole sewing machine 1 is equipped with a needle 9 to make lifting u[/down motion and right/left swing motion, cloth presser 15 to press cloth, a cloth holding plate 14 to move forward/backward in the cloth feeding direction, and a cloth cutting knife 16 to cut cloth to form a buttonhole. On buttonholing, sewing the periphery of the buttonhole is repeated at least twice under control by a controller to which an operation panel is connected as a seting inputting means and a selecting means. The cloth cutting knife 16 is actuated to cut the buttonhole part at the first round and the cut end of cloth generated thereby is rolled into the inside of the second round of buttonholing to prevent the cut end of cloth from being exposed outside.

Description

Buttonhole machine

The invention relates to a buttonhole machine, in particular to a buttonhole machine for seaming the periphery of buttonholes of raw materials.

Buttonhole machines for overlocking around buttonholes on raw materials or fabrics have been developed in the past.

The buttonhole machine has a cloth feeding device that moves the cloth in the front and back Y direction, a swinging device that swings the needle in the X direction, and a cloth cutting device that lowers the cloth cutting knife on the buttonhole of the cloth to cut the cloth. . The machine uses a combination of a cloth feeding device and a swinging needle device to overlock the periphery of the buttonhole, and cuts the buttonhole with a cloth cutter during the overlock, thereby making the buttonhole.

Buttonhole machine (hereinafter referred to as "machine"), as shown in Figure 26, surrounds the left parallel part A, the first reinforcement seam part B, the right parallel part C and the second reinforcement seam part D lock seam. When the lock seam is near the end (for example, when the lock seam of the portion C is near the end), the knife is driven so that it is lowered onto the buttonhole portion F, thereby making the buttonhole.

The "double seam pattern" is well known in the industry as a lockstitch pattern produced with a conventional buttonhole machine, the traditional double seam pattern being two overlock stitches around the above mentioned buttonhole portions A, B, C and D Made by overlapping stitches.

Because the traditional machine cuts the buttonhole just before the buttonhole pattern is completed, the cut edge E (Fig. 26) of the cloth produced by the cloth cutter is not sewn into the seam but is exposed outside the seam, making the appearance inferior.

To solve this problem, a known countermeasure is to cut the buttonhole before the buttonhole perimeter is seamed. But this method also has the disadvantage of making the appearance less attractive. Buttonholes in fabrics have cut edges that flutter when they are not overlocked, sometimes causing stitches to skip or loosening the edge seam.

In conventional machines, the stitch density of the bartack section is often higher than that of the parallel section. However, the known double-seam patterns are produced equally with overlapping seams, regardless of the reinforcement seams or the parallel sections. As a result, the stitch density at the reinforcing seam portion becomes so high that the profile becomes too raised, making the sewn product less attractive and less valuable. In addition, since the needle is lowered onto a portion of excessive density, the up and down movement of the needle can scratch the thread, often causing the thread to break.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a buttonholing machine which can provide an improved appearance of a side seam without exposing a cut edge cut by a cloth cutter. Another object of the present invention is to provide a buttonholing machine with control means for obtaining double seam patterns with improved appearance and eliminating unnecessary overlapping seams.

In order to solve the above problems, the buttonholing machine provided by the first solution of the present invention has: a sewing device for sewing the buttonholes around the buttonhole on the raw material, a cloth cutter for cutting the buttonhole on the raw material, and such control The control device of the machine, that is, when the overlock device goes around twice to overseam the periphery of the buttonhole, the cloth cutter is driven to cut the buttonhole during the first over overlock, and to cut out the overlock during the second over over overlock. not driven.

With the first solution of this machine, since the buttonhole has been cut before the second seam, the cutting edge formed by the cloth knife on the raw material can be seamed in the second seam without being exposed on the seam In addition, an improved edge seam appearance can be obtained without exposing the cut edge. In addition, a stable edge seam is obtained because the first loop of stitching is provided before the buttonhole is cut in the material.

The second solution of the present invention is based on the buttonhole machine of the first solution, so that the sewing device includes an electric Y-direction feeding driving device so as to drive the cloth feeding mechanism in the Y direction, and an electric X-direction feeding The driving device is used to drive the cloth feeding mechanism or the pendulum mechanism in the X direction. When the feed driving device in the Y direction and the X direction feeding driving device are controlled by two circles to lock the buttonhole, the control device has a cross seam function and overlapping stitching function, the function of cross stitching is to make the needle position of the first round of lockstitching and the position of the second round of lockstitch offset each other, so that the course of the first round of lockstitching and the second round of lockstitching cross, the function of overlapping stitching is to make The stitching position of the first and second rounds of lockstitch is almost the same, so that the course of the first round of lockstitch basically overlaps with that of the second round, and there is also a selection device that can be used to select the function of cross stitching or overlapping stitching.

With the second version of the machine, the overlapping seam function can be selected by means of the selection device to obtain the traditional double seam pattern or the cross seam function to form the cross edge seam, so that various lock seam patterns can be obtained.

Here, the lock seam pattern applicable to the first or second scheme of the machine above includes not only the lock seam pattern consisting of parallel parts and reinforced seam parts matched with men's shirts, but also the lock seam pattern matched with jeans, etc., in buttonholes. Both ends have lock seams extending radially from the center of the end.

The third solution of the present invention is based on the buttonhole machine of the first solution, and the buttonhole lockstitch pattern has parallel lock seam parts parallel to the buttonhole and reinforcement seam parts at both ends of the buttonhole, so that the control device has the function of using The function of thinning the reinforcement seam prevents the reinforcement seam from being locked in the first round of lock sewing, but is locked by the lock sewing device in the second round of lock sewing.

With the third option of this machine, the double seam is only applied on the parallel lock seam part with lower density side seam, but not on the reinforcement seam part with higher density side seam, so the machine can provide high quality Side seams to prevent the excessively raised side seams that would occur with conventional double seams in the backing seam. In addition, thread breakage can be prevented because there is less friction on the thread of the overlock.

The fourth solution of the present invention is to add a selection device on the basis of the buttonhole machine of the third solution so as to be used to select the function of making the reinforcement seam thinner or to strengthen the seam part of the lock seam during the first and second rounds of lock seam Overlock function.

With the fourth option of the machine, the machine can use the selection device to select the traditional double seam or thinning pattern at the reinforcement seam, so as to obtain various lock seam patterns.

Embodiments of the present invention are now described with reference to the accompanying drawings.

Fig. 1 is a perspective view showing the appearance of a buttonholing machine embodying the present invention.

Fig. 2 is a schematic perspective view mainly showing the cloth feeding mechanism and the lifting needle mechanism of the machine.

Fig. 3 is a schematic perspective view mainly showing a lifting and lowering mechanism and a swinging mechanism of the machine.

Fig. 4 is a front view from the front showing the swing mechanism in detail.

Fig. 5 is a typical view illustrating the operation of the swing mechanism.

Figure 6 shows the operation sequence of the swing mechanism: (a) shows the state where the top of the swing cam is on the baseline side, and (b) shows the state where the top of the cam is on the side of the cam swing width.

Figure 7 shows the change of the baseline position caused by the pendulum mechanism.

Fig. 8 shows the change of the swing width position caused by the swing mechanism.

Fig. 9 is a perspective view of a cloth cutting mechanism for driving a cloth cutting knife.

Figure 10 is a front view of the operating panel mounted on the machine.

Figure 11 is a block diagram of the machine circuit arrangement.

Fig. 12 is a list of items to be input from the operation panel.

Figure 13 is a graph showing length parameters for each of the portions of the lock seam pattern.

Figure 14 is a series of lockstitch patterns realized by the lockstitch sequence from 1 to 7 for double stitching for the cross stitch function.

Figure 15 is a series of lock seam patterns achieved following the lock seam sequence from Figure 14, from 8 to 14.

Fig. 16 is a general flow chart of the sequence of processes executed by the control means of the machine.

FIG. 17 is a flow chart of a subroutine of the overlock data generation process in the general flow chart of FIG. 16. FIG.

FIG. 18 is a flowchart of a pattern calculation process subroutine in the overlock data generation subroutine of FIG. 17. FIG.

19, 20, and 21 are flow charts of calculation processes A, B, and C in the pattern calculation subroutine of FIG. 18, respectively.

FIG. 22 is a flow chart of the knife drive timing calculation subroutine in the lock seam data generation subroutine of FIG. 17. FIG.

Fig. 23 is an explanatory table of the knife driving stitch number Mn parameter used in the knife driving timing calculation subroutine of Fig. 22 .

FIG. 24 is a flow chart of the overlock process subroutine in the general flow chart of FIG. 16. FIG.

Fig. 25 is a flowchart of another example of buttonhole processing realized by the machine control device.

Fig. 26 is a diagram for explaining the names of the parts of the buttonhole.

Explanation of labels:

1-buttonhole machine, 6-upper shaft, 8-needle bar, 9-needle, 14-fabric holding plate, 15-work clamp, 16-cloth cutting knife, 18-needle bar swing base, 20-Y direction feeding Pulse motor (feeding drive device in Y direction), 40-baseline pulse motor (feeding drive device in X direction), swing width pulse motor (feeding drive device in X direction), 80-upper thread cutting knife, 100-CPU (central processing unit, control device), 110 - operation panel (selection device).

Embodiments of the present invention will now be described, referring initially to Figures 1-3.

The buttonhole machine 1 has: a needle 9 that can move up and down and swing left and right, a workpiece holder 15 that presses the cloth (material to be seamed) to hold the cloth thereon and move it back and forth in the cloth feeding direction The cloth holding plate 14, the upper line cutting knife 80 used to cut the line above the workpiece holder 15, the cloth cutting knife 16 used to cut the cloth to form buttonholes, and the data input device used as a selection device and input setting data The operating panel 110 (FIG. 10), and the control device (FIG. 11) for controlling the machine 1 embodies the present invention.

The workpiece holder 15 and the cloth holding plate 14 constitute a part of a cloth feeding mechanism which moves the cloth back and forth in the direction of cloth feeding and holds the cloth during lock stitching. As shown in FIG. 2 , the workpiece holder 15 is connected to the bracket 23 through a connecting arm 24 , and the cloth holding plate 14 is directly connected to the bracket 23 . The bracket 23 is fixed to a feeding shaft 22 provided with a rack 22a thereon, and is driven to move back and forth by a Y-direction feeding motor 20 as a Y-direction feeding driving means constituted by a pulse motor or the like, thereby The work clamp 15 and the cloth holding plate 14 are moved back and forth.

As shown in Figures 2 and 3, the lifting needle mechanism that is used to make the needle 9 rise and fall includes: an upper shaft 6, a lock seam motor 5 or pulse motor, etc., and a crank cam 7. The rotation of the overlock motor 5 is converted into the up and down movement of the needle bar 8 through the crank cam 7, thereby moving the needle 9 up and down. The upper shaft 6 is connected to a lower shaft 11 through a vertical shaft 10, and the upper and lower ends of the vertical shaft 10 are respectively provided with helical gears 10a and 10b to drive a pawl 12 connected to the lower shaft 11.

FIG. 4 is a front view of the pendulum mechanism of the machine 1 viewed from the front. Figure 5 is a typical view of the pendulum mechanism to illustrate its operation. Figure 6 is the operation sequence of the swing mechanism; (a) shows the state where the top of the swing cam 54 is on the baseline side, and (b) shows the state where the top of the cam 54 is on the side of the cam swing width.

The swing mechanism for swinging the needle 9 in the left and right direction has: a main swing mechanism for swinging the needle 9 to the left with the base line as the origin, a swing width changing mechanism for changing the swing width of the needle, and a swing width changing mechanism for making the base line in the left and right directions. A baseline changing mechanism that changes direction.

As shown in Figure 3-6, the main swing needle mechanism has: needle bar swing base 18, needle swing arm 49, connecting shaft 48, connecting rod 47, needle swing cam lever 46, needle swing cam (triangular cam) 54, drive shaft 53, and reduction gears 51,52. The rotation of the upper shaft 6 is transmitted to the needle swing cam 54, thereby causing the needle swing cam lever 46 to swing by a given width, so that the needle bar swing base 18 swings around the pivot shaft 18a, so that the needle 9 swings left and right. In this example, the connection shaft 48, the drive shaft 53, and the shaft pin 44b are fixed in their positions while the needle swing base 18 performs the swinging motion. On the other hand, both the pivot pin 45a and the link pin 46a are rotatably connected to the associated parts and are movably disposed.

The needle oscillating motion is synchronized with the up and down motion of the needle 9 via the upper shaft 6 . When the needle 9 falls for an odd number of times, the needle bar 8 is on the base line; while for an even number of times, the needle bar 8 is swung and located on the left side of the base line with a given swing width.

Figure 7 shows the change of baseline position performed by the needle swing mechanism. Fig. 8 shows changes in swing width performed by the needle swing mechanism.

As far as the swing width changing mechanism is concerned, it can also be seen from FIG. 8 that the rotation of the swing width motor 41 (pulse motor or the like) passes through the links 55 and 56 to make the drive shaft pin 44b that adjusts the movement of the cam lever 46 swing toward the change direction. The width direction (basically the left and right direction) moves to change the swing width of the needle 9 .

As far as the baseline changing mechanism is concerned, it can also be seen from FIG. 7 that when the baseline changing motor 40 (pulse motor or the like) rotates, the baseline arm 43 swings around the pivot 43a, causing the position of the pivot pin 44b to swing toward the changing direction. The direction of the origin (basically the up-down direction) changes, thereby changing the base line position when the needle 9 swings.

That is to say, the swing width motor 41 and the baseline motor 40 constitute the driving device for feeding in the X direction, and because these two motors drive the pendulum mechanism, the needle bar 8 can be made to swing in the left and right direction.

Fig. 9 is a perspective view of the cloth cutting mechanism (cloth cutting device), wherein the buttonhole is formed by moving the cloth cutting knife downward at the buttonhole position of the cloth to cut through the cloth. The cloth cutting mechanism has: the cloth cutting knife 16 is mounted on the knife mounting plate 31 at its lower end, rotates around the pivot 35a to drive the driving lever 35 for driving the knife mounting plate 31 to move up and down, and is connected with the upper shaft 6 to transmit its rotation. It is a knife driving arm 36 that moves up and down at one end at a high speed, and is arranged to engage with the knife driving arm 36 so that the up and down motion of the driving arm 36 is transmitted to the knife driving draw hook 37 of the drive lever 35, and is used to drive the draw hook 37 and drive A solenoid 75 between the arms 36 controls connection or disconnection.

The plunger 75a of the solenoid 75 is normally pushed outwards to disengage the drive hook 37 from the drive arm 36 while the cloth knife 16 remains in its upper position. When the plunger 75a is retreated according to the command of the driving knife, the engagement groove portion 37a on the driving hook 37 is engaged with the driving arm 36 due to the pulling action of the spring 37b, and the up and down motion of the driving arm 36 is transmitted to the driving hook 37 and the driving arm 36. On the driving arm 35, the knife-loading plate 31 moves downwards.

Fig. 10 is a front view of an operation panel 110 related to the machine 1 of this embodiment. The operation panel 110 is, for example, mounted on the overlock stand of the machine 1, on which various overlock parameters can be input and the set value or error status can be displayed. The parameters set by the plate 110 include the parameters of "double seam selection" and "reinforcing seam thinning". Thinning of backtack" selects the pattern formed by not locking the bartack in the first round of locking. Selection means are provided on board 110 for selecting these parameters.

Operation panel 110 comprises: start the lock seam key 131 that lock seam is used, after pressing lock seam key 131, be used for indicating the LED (light-emitting diode) display lamp 132 of lock seam mode, be used for selecting the selection chain 133 of input mode, indicate The pattern number 134 and parameter number 135 display part of the input mode selected by the selection key 133, the mode display 141 composed of 2-digit 7-section elements, and the parameter display 142 composed of 4-digit 7-section elements are respectively reduced by ±1 and Increased minus key 143 and plus key 144, the down key 145 and the up key 146 that reduce and increase the input parameter value with a given unit respectively, are used to inform the setting key 147 of the threading of the needle 9 and the positioning operation of the draw hook.

FIG. 11 is a block diagram of the circuit arrangement within the machine 1 . The control device of machine 1 is shown in Figure 11, has: CPU (internal processing unit) 100, RAM (random access memory) 102, ROM (read only memory) 101, Y direction feeds counter 103, baseline feeds counter 104, and swing needle width counter 105, these counters are used to count the rotation amount of each pulse motor, and there is also a cloth cutting knife counter 106 used to count the driving times of the cloth cutting knife, which is used to drive the Y direction of each pulse motor Feed motor driver 111, baseline feed pulse motor driver 112, and swing width pulse motor driver, I/O (input output) interface for connecting various sensors, various drivers, and operation board 110 with CPU 100 109, used to control and drive the lock seam motor driver 115 of the lock seam motor 5, the rotation amount of the motor 5 is compiled into the lock seam motor encoder 119 representing the code output of the upper shaft 6 rotation angle, used to drive the VCM (voice coil Motor) 60 in order to adjust the active tension driver 120 of the upper line tension of the line tension device 19, used to drive the workpiece clamp solenoid 122 so as to lift the workpiece clamp driver 121 of the workpiece clamp 15, used to drive the cloth cutting knife cylinder 30 so that the cutting Cloth cutter air/hydraulic cylinder driver 123 that cloth cutter 16 descends, and is used for outputting the blocking signal at a given time such as the rotation count of various pulse motors at the cloth feeding position, the rotation angle of the upper shaft 6, etc. to the blocking controller 108 on the CPU 100.

The overlock motor driver 115 is connected not only with the overlock motor 5, but also with a needle up position sensor 116 for detecting the upper position of the needle 9, a work clamp 15 for detecting, a cloth holding plate 14, and a TG (tacho generator) 118. The feeding reference position sensor 117 is connected to the reference position of etc.

The I/O interface 109 is not only connected with the operation panel 110 and various drivers, but also with the knife drop detection switch 34 for detecting the drop of the cloth cutting knife 16, the work clamp lower detection switch 28 for detecting the work clamp 15 descending, and the detection work clamp 15. and the Y direction of the origin of the cloth holding plate 14 is fed to the origin sensor 26, the baseline of the detection pendulum mechanism baseline origin is fed to the origin sensor 57, the pendulum origin sensor 58 of the pendulum needle width origin is detected, used for The work clamp switch 124 that commands the work clamp to descend and the start switch 125 that is used to command the overlock motor 5 to start driving are connected.

The CPU 100 controls data to/from the operation panel 110, and detects signals from various sensors and various drivers according to control programs stored in the ROM 101, using some areas of the RAM 102 as work areas.

The ROM 101 stores control data and control programs for performing an input process to input various setting parameters from the operation panel 110 . The calculation process is used to calculate various lockstitch styles such as single stitch and multiple double stitches, and the lockstitch process is used to lockstitch buttonholes according to the calculated styles. The calculation process and the overlock process will be described in detail below.

With the above structure, the machine 1 can overlock various buttonhole overlock patterns by receiving various setting data from the board 110, calculating overlock patterns to be overlocked, controlling and driving the machine 1.

Items to be set on the operation panel 110 will now be described first. FIG. 12 is a list of items to be input from the operation panel 110. As shown in FIG. Fig. 13 is a diagram showing length parameters of various portions of a lockstitch pattern.

The setting data that will be imported from operating panel 110 comprises: pattern selection length data (referring to Fig. 13) as " cutting cloth length " (a), " knife width (b) ", " plus circumference sewing stitch length " (c) , "Stitch Width of Reinforcement Stitch" (d), "Pitch of Parallel Part" (e), "Pitch of Stitch of Reinforcement Stitch" (f), "Cloth Cutting Knife-First Reinforcement Seam Interval" (g) , "cloth cutting knife-second reinforcement seam interval" (h), and the "knife lowering left and right position" data specifying the displacement of the knife lowering position in the left and right directions; specify the correction value of VCM 60 to adjust the tension device 19 "Active Tension Correction" data of the tension; the tension data at each predetermined moment of lock seam include "parallel part tension", "reinforcing seam tension", "tension at the beginning of lock seam", "tension at the end of lock seam" , and "tension when thread cutting";"cloth cutter size" data (L ₁ ), "workpiece clamp size" data, "single seam/double seam conversion" data, "double seam selection", "first Thinning of the loop reinforcement seam", in the case of double stitching "knife drive at the first loop", "feed position at the start of the lockstitch" for specifying the feed position at the start of the lockstitch, at the start of the lockseam "Base line position at the start of lock stitching" used to designate the base line position (reference position of the swing mechanism) at the beginning and "machine speed when the knife is driven" indicating the machine speed when the cloth cutting knife 16 is driven.

Among the set items, item numbers 18 to 21 are "Single seam/double seam conversion", "Double seam selection", "Thinning of reinforcement seam at the first turn", and "At first turn The driving of knife " these four items are all related to the present invention.

In the item "Single stitch/Double stitch conversion", "1" or "2" means to select single stitch or double stitch respectively. In the item "selection of double stitching", "0" or "1" selects the overlapping stitching or cross stitching function in double stitching respectively. On the item "Thinning of the first round of backtacking", "1" or "0" means the thinning function of the backtacking or the double stitching of the two rounds of stitching on the backtacking part respectively. On the item "drive of the first round knife", "0" or "1" respectively select whether the cutting knife is driven or not driven during the first round of overlock.

When operating the machine 1 , the operator first performs an input process to input setting data into the operation panel 110 . Since each setting item has a pre-set error value or pre-input data in the memory, the operator can only input the data that must be changed.

Each setting item has its own range that can be set. This range can be used to check the input data. Whether the data is within this range can identify whether there is an error.

Multiple setting data groups can be registered for each overlock pattern number. In this way, the operator can read out the corresponding setting data group by selecting the style number, so as to control the locking seam of the prescribed style.

After the setting data is input, the workpiece material is set on the machine 1, and the lock seam key 131 on the operation panel 110 is activated, and the control device then calculates the lock seam pattern according to the input data. Figures 14 and 15 are a series of views of overlock patterns calculated in overlock sequence.

If "Single seam/double seam conversion" is selected as "2", "Double seam selection" is "1", and "Thinning of the first round of backtack" is "1", then the cross stitch and backtack become The thin function will work, so that the patterns shown by circled 1 to 14 in Figures 14 and 15 can be drawn in sequence.

The function of the cross seam is to make the side seam of the first circle lock seam and the second circle cross each other on the left and right parallel parts A and C (Fig. 26). In terms of the function of the cross stitch on the parallel section A, for example, the edge seams P ₂ -P ₃ of the first lockstitch (circled 2 in Fig. 14) and the edge seams P ₇ -P of the second lockstitch ₈ (circled 7 in Fig. 14) cross where there is a shifted stitch without material feed (dotted stitch) at the start of the second lockstitch, P ₆ - _{P 7} (circled 6 in Fig. 14 ). The lockstitch on the right parallel C is done in the same way as the parallel A.

The function of backtack thinning is achieved by applying only the second round of backtack stitches on the first and second backtack portions B and D without applying the first round of stitches. For example the thinned backtack on section B is formed by the first loop of transfer stitches P ₃ -P ₄ (transferred from section A to section C, circled 3 in Figure 14) and the second loop of backtack stitch P ₉ -P ₁₀ (circled 9 in Figure 15). The second backtack portion D is lockstitched in the same manner as portion B.

The transfer stitch is realized in this way, as shown by the circled 3 in Figure 14, when the two stitches starting from the end point P ₃ of part A are locked in part B, the feeding of the cloth is stopped, and the base line of the swing needle is Offset to the position of the lock seam part C, then lock seam is performed at the lock seam start point _P4 , and the cloth is fed upside down in the Y direction. The transfer traces (P ₅ -P ₆ , circled 5 in FIG. 14 ) from the right parallel portion C to the left parallel portion A will proceed in the same way. In circled 3 and 5 in Fig. 14, the white dots represent the lower needle points on the base line side.

If "0" is selected in the setting item "selection of double seams", then the overlapping seam function will be executed; at the time, at the start point of the second round of lock seam in parallel part A (circled in Figure 14 6) Since the above-mentioned dotted line stitches are eliminated, the edge seams of the first circle and the edge seams of the second circle are almost superimposed on the same line.

In the input operation, when the thinning function of the backtacking seam is not selected as "0" for the "thinning of the first round of backing seam", the calculation of the usual backtacking stitch pattern should be performed and the addition in Figure 14 should be omitted. Circles 3 and 5 show the calculation of the transfer stitch pattern above.

After the lock seam pattern is calculated, the calculation of the driving timing of the cloth cutting knife is performed to drive the cloth cutting knife 16 . If "1st round knife drive" is specified as "0", then the given timing in the second round of lockstitch should be made, if it is specified as "1", then the timing in the first round of lockseam should be Calculated.

These calculation procedures will be described in detail later.

After completing the calculation of lockstitch pattern, the needle 9 can be lowered by controlling the Y-direction feed motor 20, the baseline feed motor 40 and the swing needle width motor 41 according to the calculated coordinates, so that the buttonhole can be made lock seam. At this time, at the calculated timing, the cloth cutter descends to cut a buttonhole seam, thereby forming a buttonhole.

In the final process, the upper thread is cut by the upper thread cutter 80, and the lower thread is cut by the cutter under the needle plate, thereby completing one cycle of buttonhole lockstitching.

The sequence of the process including the above-mentioned calculation of the double-slit pattern performed by the control means of the machine 1 will now be described in detail. Figure 16 is a general flowchart showing the keyhole process sequence. This keyhole process starts, for example, with the start of the machine 1 .

When the machine 1 is started, the subroutine of the panel setting process is executed at step S1. If at work step S2, lock seam key 131 is opened (ON), so process advances to work step S3, if not, just turns back to work step S1. Steps S1 and S2 are repeated until the lock seam key 131 on the plate 110 is depressed, during which all setting data shown in FIG. 12 can be input.

In step S3, the subroutine for establishing lockstitch data is executed, and the lockstitch pattern and the driving timing of the cloth cutter are calculated according to the input setting data. In work step S4, such as from RAM102 read error mark, if any error mark is recorded in previous work step, this process just stops in work step S5 so, and corresponding error indication is sent to the board 110 The display unit 140, if not, proceeds to step S6.

In step S6, a signal for lowering the workpiece holder 15 is output to the workpiece holder solenoid driver 121. Then in step S7, feed the motor 20, the baseline feed motor 40 and the pendulum respectively to the Y direction according to the feed origin sensor 26, the base line feed origin sensor 57 and the pendulum needle origin sensor 58 from the Y direction. The output of each motion detection of the needle width motor 41 detects the respective origins of the cloth feeding mechanism and the pendulum mechanism. In step S8, the needle 9 is moved to the first needle lowering position, and the motors 20, 40 and 41 are driven.

In step S9 , a signal for lifting the workpiece holder 15 is output to the workpiece holder solenoid driver 121 . If at work step S10, lock seam key 131 really belongs to unlatching (ON), so process advances to work step S11, as shut-off (OFF), just turns back to work step S1 so. In step S11, the workholding switch 124 is sensed, if it is ON, then the process goes to step S12, if it is OFF, it turns back to step S10, and so on. After the workpiece clamp switch 124 is turned on, detect with the workpiece clamp lower detection switch 28 in step S12, if the workpiece clamp 15 is at its upper position, then a signal is given at work step S13 to make the workpiece clamp 15 descend. 15 has been lowered, the output signal at step S14 raises the workpiece holder 15 and returns the process to step S10.

If the work clamp switch 124 is determined to be ON at step S15, the process moves to step S16, and if it is OFF, the work clamp 15 is lifted at step S14. If in work step S16, start switch 125 is to open to cause lock seam to start, so process advances to S17, if switch 125 is OFF, then turns back to work step S15.

In work step S17, carry out the lock seam process according to the lock seam data established in the lock seam data establishment process in work step S3, the lock seam process includes a buttonhole from the beginning to the end of the lock seam, together with the driven lock seam motor 5, The driving of the cloth cutter 16, and the adjustment of the yarn tension set on the tension device 19 during each locking stitch.

In work step 18, for example, read out the error mark recorded in the previous work step from RAM102, if there is not any error, so process can enter next work step S19, if find any mistake, process is just in work step S20 Stop and indicate the corresponding error on the display portion 140 of the board 110 .

In step S19, the tension of the cut wire is imparted to the tension device 19 by signaling a preset value to the active tension driver 120.

In step 21, the process of wire cutting/workpiece clamp lifting is performed, the wire is cut with a wire cutter 80, and then the workpiece clamp 15 is lifted.

When the upper position of the workpiece clamp 15 is detected by the detection switch 28 under the workpiece clamp in step S22, in step S23, due to the action of the active tension driver 120, the wire tension device 19 is released. Thereafter, the process returns to step S10 and is repeated.

Fig. 17 is a subroutine for establishing lock seam 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 ROM 101 (see FIG. 12). An error flag is set in RAM 102 if the input data is outside this range. If any error is found at step 32, this subroutine is terminated and returned to the overall flow. If no error is found in step S32, the process goes to step S33 to calculate the overlock pattern, then to step S34 to calculate the driving timing of the cloth cutter 16, and terminates this subroutine.

Fig. 18 is a flow chart of the subroutine of the work step S33 calculating pattern in the lock seam data establishment process.

In step S41, according to the input data stored in RAM 102 inputted in step S1, including "lock seam start feeding position" and "lock seam start baseline position", calculate the position from the first needle lowering position to the left parallel part (P ₁ -P ₂ in FIG. 14 ) the coordinate positions of the initial number of traces of the starting point.

According to the name of the input data, "conversion of single/double seam", "selection of double seam" and "thinning of the first round of reinforcing seam", select appropriate branches in steps S42, S43, S44, and S45 respectively.

When the double slit is not specified, the calculation process at step S46 can be performed. If double seams, overlapping seams and normal reinforcing seams are specified, then the calculation process in steps S47 and S48 can be selected; if double seams, overlapping seams and thinned reinforcing seams are specified, then work step S49 can be used And S50, if double seam, cross seam and normal reinforcement seam, use work step S51 and S52 so; And if double seam, cross seam and thinning reinforcement seam, use work step S53 and S54 so. After each calculation process is completed, this subroutine ends and is transferred to the next step in the overlock data creation process (FIG. 17).

Generally speaking, calculation process A (in work step S46, S47, S48, S50 and S51) is corresponding to common buttonhole side seam, and calculation process B (in work step S49 and S53) is corresponding to the buttonhole side seam without reinforcement seam, However, calculation process C (in steps S52 and S54) corresponds to an offset of a seam in the side seam of the buttonhole relative to the side seam in process A. A detailed description of these calculations is given below.

FIG. 19 is a flow chart of calculation process A in the pattern calculation process.

First, in the calculation step S61 of the left parallel part, according to the input data in the step S1, the base line position "a1" (point P ₂ in Fig. 14 ), the width (db)/2 (see Fig. 13 ) and feeding pitch "e" (the value of which is the length of the left parallel section divided by a certain integer).

Thereafter, in the calculation step S62 of the first reinforcement seam, the base line position "a2" (point P9 in Fig. 15), reinforcement seam trace width "d" and feeding node distance "f" (the value of which is the value of reinforcement seam length divided by a certain integer). In step S63 of the right parallel portion, the baseline position "a3" (point P4 in Fig. 14), width (d-b)/2, and pitch "e" are calculated. In step S64 of the second backtacking portion, the base line position "a4" (point P13 in FIG. 15), width "d" and pitch "f" are calculated. In lock seam termination calculation step S65, the number of stitches of each part, that is, the left parallel part, the first reinforcement seam part, the right parallel part and the second reinforcement seam part, is all added up as the total number of stitches, and the stitches of each part The numbers are calculated by dividing the length of the section by its feed pitch.

By adopting this calculation process A, the number of stitches in one circle of the usual buttonhole can be calculated.

FIG. 20 is a flowchart of calculation process B in the pattern calculation process. In step S71, the same calculation as in step S61 is performed. In addition, the calculation of "a2" is performed in step S72, the same calculation as in step S63 is performed in step S73, and the calculation of "a4" is performed in step S74.

Using this calculation process B, the number of stitches in one circle of buttonhole side seams without reinforcement stitches can be calculated.

FIG. 21 is a flowchart of calculation process C in the pattern calculation process. At first in step S81, the motion of the pulse motor is calculated as a trace of 0, and the feed motor 20 in the Y direction is not driven (P6-P7 in circled 6 among Fig. 14 ). Next, in step S82, the same calculation as in step S61 is performed, and in step S83, the same calculation as in step S62 is performed. Carrying out the motion of pulse motor in work step S84 is the calculation of a trace of 0 next, calculate the pulse motor 20 that does not drive Y direction to feed and a trace of other motors in the pendulum mechanism (adding in Fig. 15 P12-P13 in the 12 of circle), in addition also carry out the same calculation with in work step S63 in work step S85, carry out in work step S86 and carry out the same calculation in work step S64, and carry out in work step S87 and in work step Same calculation for S65.

Using this calculation process C, a buttonhole seam can be calculated with one seam offset relative to the seam in process A.

The overlock pattern specified by the input setting data can be calculated by combining the above-mentioned processes A, B and C according to the pattern calculation process of FIG. 18 . For example, by combining the process B in step S49 with the process A in step S50, such a lock seam pattern can be calculated, that is, the first circle of side seams and the second circle of side seams (overlapping stitches) are on the parallel portion Is the same, only the first turn of the reinforcement seam is thinned.

Fig. 22 is a flow chart of the knife driving timing calculation subroutine executed in step S34 in the locking seam data establishment process in Fig. 17. Fig. 23 is a table of parameters for the number of knife drive stitches Mn used in this calculation.

This knife driving timing calculation process can calculate the knife driving times n of the knife 16, and the number of knife driving stitches "M1-Mn" corresponding to the times "1-n" (see FIG. 23).

At first in step S101, the single stitch or double stitch is selected by the setting data "conversion of single/double stitch". In the work step S102 that double sewing is used, if the setting data "the first circle knife drive" specifies the first circle drive, the process will go to the work step S104, and if the second circle drive is specified, then go to the work step S105.

If single stitch is selected in step S101, then the variable "M" of step S103 is replaced by the stitch number up to the starting point of the right parallel portion calculated in the pattern calculation process of Fig. 18. If be forwarded to work step S104 by S101 and S102, replace variable M with the number of stitches up to the first circle starting point (P4 among Fig. 14) of right parallel portion so. If going to step S105, the variable M is replaced with the number of stitches up to the second turn starting point (P10 in FIG. 15) of the right parallel portion.

Thereafter, according to the input data "cloth cutting length" (a) and "cloth cutting knife size" (L1), after work steps S106 to S113, calculate the necessary driving times "n" that the knife 16 cuts the buttonhole length (a) And until the number of driving stitches M1-Mn of the knife 16 driven by the knife for the nth time. That is, when the number of stitches reaches the number M1-Mn counted from the overlock, the cloth cutter 16 is driven.

In other words, in steps S101-S105, after substituting the variable M for the number of stitches at the starting point of the first or second lockstitch of the right parallel part, the same process route as that of steps S106-S113 is adopted, according to This knife drives timing calculation process, can calculate the number of stitches that knife 16 descends in the first circle or the second circle lock seam.

Fig. 24 is a flow chart of the overlock process subroutine of step S17 in the general flow of Fig. 16 .

This overlock process starts at work step S131, and at that time, the total number of stitches calculated in the pattern calculation process is designated as "remaining stitch number parameter", and then at work step S132, the power-on signal is output to drive the overlock motor 5, and then moves Go to work step S133 so as to confirm whether this machine is in the rotating state. If it is rotating, the program moves to step S134, if not, the program repeats until the state changes to rotating. Thereafter, the steps S134 to S141 are repeated until the machine is shut down in order to carry out the actual overlock process.

In step S134, the rotation of the machine is monitored and the process will be terminated at shutdown.

When according to the speed measuring TG generator 118, the rotation angle of the upper shaft 6 reaches a predetermined angle in step S135, the process proceeds to step S136, at which time the lower needle position is fed to the motor 20, baseline according to the lock seam pattern calculated in the Y direction. The motor 40, and the swing width motor 40 move. That is, in the process of work steps S135 and S136, the actual lock seam is fed to the cloth according to the prescribed lock seam pattern.

In step S137, when the needle up position sensor 116 detects that the needle bar 8 has risen beyond a given position, the process moves to step S138, at which time the number of stitches is counted, and when the number of stitches reaches the number of driving stitches " M1"~"Mn" to execute the driving process of the cloth cutting knife 16.

If in step S139, according to the requirement of the feeding reference position sensor 117, the feeding reference needs to be blocked, then the process moves to step S140, so as to perform the setting process on the feeding reference position. Finally, in step S141, confirm the driving of the knife 16 when the number of stitches is consistent with the number of driving times of the knife.

According to the embodiment of the control device of the above-mentioned machine 1, because the cloth cutting knife 16 selects "1" in the setting parameter "the first circle knife drive", it will be locked in the first circle of lock seam before the second circle of lock seam. The driving cuts out the buttonhole, so that the cut edge of the fabric formed by the knife can be overlock stitched in the second stitch without being exposed outside the stitch, so that the appearance of the edge seam can be improved.

Select "0" in the setting parameter "Double seam selection" to get the function of cross stitching, in which the second round of side seam crosses the first round of side seam, which is different from the traditional method of overlapping the second round of side seam A better edge seam pattern can be obtained than a double seam pattern on a circle edge seam. In addition, this cross stitch is only applied to the apparent parallel sections, thereby reducing the lockstitch cycle time and the number of stitches.

Furthermore, the overlapping seam function of the traditional double seam pattern and the cross stitch function forming the cross side seam can be selected by setting the parameter "double seam selection", so that various lock seam patterns can be obtained.

By specifying "1" in the setting parameter "Thinning of the first round of backtacking", it is possible to apply the double stitch only to the parallel lock seam with a low-density side seam and not to the high-density side seam On the reinforcement seam, so the machine can provide high quality edge seam, and prevent the excessive raised edge seam common in the traditional double seam in the reinforcement seam. In addition, this machine makes it possible to choose the usual double seam or the thinning pattern at the bartack part through the selection of "thinning of the first round of backtacking", so that various lockstitch patterns can be obtained.

The invention is not limited to the control device of the machine 1 described above. For example, cloth feeding in the X direction may be performed by feeding cloth instead of the pendulum needles described in the embodiments. A pulse motor is used as the driving means in the description, but a servo motor or the like may also be used. As far as the overlock style is concerned, the present invention is applicable to a style in which each reinforcing seam portion is overlocked with radial stitches from the buttonhole end. Other variations can also be used in the double seaming process.

Figure 25 shows a flowchart of another example of a buttonhole process.

As far as the double-slit process is concerned, the double-slit overlock is carried out according to the double-slit calculation results in the above-mentioned embodiments. However, the process shown in Figure 25 can also be used, that is, in step S201, after the first round of lock seam is completed, if it is determined to use double seams in work step S202, then the process can proceed to S203, so as to realize the second round of lock seam , if this is not done, the overlock process can be terminated here. Afterwards, in step S204, the work clamp 15 can be raised to complete the entire buttonhole process.

Claims (4)

1. A buttonhole machine having: a locksewing device for surrounding a buttonhole on a raw material; a cloth cutter for forming a buttonhole on a raw material; and a control device; it is characterized in that the control device controls the lock such that Eyelet machine, so that when the overlock device is overlocked twice around the periphery of the buttonhole, the cloth cutter is driven to form the buttonhole during the first round of overlock instead of the second round of overlock. 2. According to the buttonhole machine of claim 1, it is characterized in that the overlock device includes an electric drive Y direction feeding drive device that moves the cloth feeding mechanism in the Y direction, and moves the cloth feeding mechanism or the pendulum mechanism in the X direction The electric drive X-direction feed drive device, and when the buttonhole is locked twice around the buttonhole under the control of the Y-direction feed drive device and the X-direction feed drive device, the control device has a cross stitch function to make the first round of lockstitch The position of the lower needle and the second circle are offset from each other, so that the route of the first circle of lockstitching and the second circle are intersected, and the function of overlapping seams can make the position of the lower needle of the first circle and the second circle of lockstitching almost the same , so that the lockstitch route of the first circle basically overlaps with the second circle, and also has a selection device that can be used to select the function of cross stitching or overlapping stitching. 3. The buttonhole machine according to claim 1, wherein the buttonhole lockstitch pattern has two parallel lock seam portions parallel to the buttonhole and reinforcement seam portions at both ends of the buttonhole, and the control device has a function of thinning the reinforcement seam portions , at this time, the reinforcement seam is not locked by the locking device during the first round of locking but during the second round of locking. 4. The buttonhole machine according to claim 3, characterized in that it also has a selection device, which can be used to select the function of the thinning of the reinforcement seam or the lock seam function that the reinforcement seam is all locked during the first round and the second round of lock seam .

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