KR100961344B1 - Buttonhole sewing machine - Google Patents

Abstract

The present invention is directed to a shortening of the cycle time from the knitting to the formation of the buttonhole in the buttonhole making machine for forming the cutting hole and the buttonhole in the fabric. Or the like, to form a buttonhole stitching sweat W on the fabric, and then drive the feed table 16 by the fabric conveying means to fabricate the fabric at the sewing end position. A sewing machine which moves to a cloth cutting position where cloth cutting is possible by means of 42, and forms a buttonhole between the straight portions of the working cloth on the feed table 16 by the cloth cutting knife 41 and the knife tray 42. In the control device 110, the lowering of the knife holder 42 toward the cloth cutting knife 41 is started before the processing cloth reaches the cloth cutting position by the movement of the feed table 16, and thus the knife holder ( 42) Reaching the lowered position in contact with the fabric of the fabric And it controls the driving of the cloth cutting means so that after reaching to.

Description

Buttonhole making machine {BUTTONHOLE SEWING MACHINE}

BRIEF DESCRIPTION OF THE DRAWINGS The side view which shows the structure of the buttonhole making machine of one Embodiment which applied this invention.

Figure 2 is a front view showing the configuration of the buttonhole sewing machine of Figure 1;

FIG. 3 is a schematic plan view of a feeder showing the positional relationship between a sewing end position and a cloth cutting knife in the buttonhole making machine of FIG. 1; FIG.

4 is a block diagram showing a control device of the buttonhole sewing machine of FIG.

5 is a view showing an example of an operation panel provided with the buttonhole making machine of FIG.

Fig. 6 is a view showing bird eye knitting stitches performed by a buttonhole making machine, Fig. 6 (a) is a schematic diagram of hatching shape, and Fig. 6 (b) shows a table for selecting a bird eye shape. 6 (c) is a diagram showing the shape of a bird's eye hole for the explanation of the table in FIG. 6 (b), and FIG. 6 (d) is a table showing the length of each stitch in FIG. 6 (a). .

7 is a diagram showing an example of pattern data stored in a RAM;

FIG. 8 is a table showing an example of setting contents of a memory switch used in drive control of the start of lowering of the barrel; FIG.                 

FIG. 9 is a table showing an example of setting contents of a memory switch used in drive control of the start of lowering of the barrel; FIG.

Fig. 10 is a flowchart showing a control process of a buttonhole making machine as an example of the present invention.

Fig. 11 is a flowchart showing a setting process of a memory switch in the control process of a buttonhole making machine as an example of the present invention.

Fig. 12 is a schematic diagram showing the relationship between the operation position of the transfer table and the operation position of the knife holder in the buttonhole sewing machine of the present embodiment, from the end of sewing to the operation of cutting the cloth;

Fig. 13 is a timing chart showing a relationship between a feeding operation and a cloth cutting operation when performing position control in a buttonhole sewing machine.

The schematic diagram which shows the relationship between the operation position of the conveyance base, and the operation position of a knife holder from the end of sewing when the thread clamp device is provided, to the cloth cutting operation in the buttonhole sewing machine of this embodiment.

FIG. 15 is a timing chart showing a relationship between a feeding operation and a cloth cutting operation during time control in the buttonhole making machine shown in FIG. 14;

Fig. 16 is a schematic diagram showing the relationship between the operation position of the transfer table and the operation position of the cloth cutting knife from the end of sewing to the cloth cutting operation in the conventional electronic buttonhole sewing machine.

<Description of the symbols for the main parts of the drawings>                 

10: bird eye sewing machine (button hole sewing machine) 14: needle

15: needle bar

16 cloth transfer table (cloth transfer means)

30: operation panel (setting means: cloth conveying means: cloth cutting means)

41: cloth cutting knife 42: knife stand

82: X-axis motor (cloth feed means) 83: Y-axis motor (cloth feed means)

85: cloth feed motor (cloth cutting means) 113: CPU (control means)

W1: Right sewing part (straight line) W3: Left sewing part (straight line)

110: control device (control means) H: buttonhole

The present invention relates to a buttonhole making machine.

Background Art Conventionally, an electronic buttonhole making machine is known which automatically drills a buttonhole and performs stitching around the buttonhole.

This buttonhole sewing machine includes a needle bar provided with a needle, a needle rocking mechanism that shakes the needle bar left and right, and a looper mechanism disposed to face the lower side of the needle bar, while simultaneously swinging the needle bar up and down, The sewing machine drive mechanism which drives a looper mechanism, and the cloth feed mechanism which inserts a process cloth and sends it to the front-back, left-right direction, and cuts a buttonhole of arbitrary shape by cooperation of these sewing machine drive mechanisms and a cloth transfer mechanism.

In addition, such a buttonhole sewing machine is provided with a cloth cutting mechanism for forming buttonholes in the processing cloth, and forms buttonholes inside the cutting portion before or after cutting. The cloth cutting mechanism includes a cloth cutting knife and a knife receiver which are disposed to face up and down, and arranges a working cloth between the cloth cutting knife and the knife holder, and one of the two faces toward the other. By moving and matching, the fabric is cut to form buttonholes.

In such a buttonhole making machine, a plurality of pattern data are stored for the size and shape of the buttonhole knitting that can be formed, and each of the drive mechanisms is driven by calling one of them on the operation panel, so that a predetermined buttonhole yarn is used. It is making a float.

By the way, in the buttonhole sewing machine, as shown in FIG. The cutting knife 62 and the knife base 63 were provided.

Then, when cutting the cutoff 63 after forming, to form a buttonhole, the cloth cutting position for cutting the processing cloth K by the cutoff 63 and the cloth cutting knife 62 from the end of sewing. After moving the cloth feeder with which the cloth feed mechanism is provided based on the setting of the pattern data (refer to FIG. 16 (b)), the knife holder 63 is moved to the cloth cutting knife 62 by driving the cloth cutting mechanism. It descend | falls toward the surface, and makes it conform, and forms a buttonhole in the predetermined position of the workpiece | work cloth K (refer FIG. 16 (c)).

In the conventional buttonhole making machine as described above, the fabric feed table on which the processing cloth K is placed is moved to the fabric cutting position as described above (see FIG. After K) reached the cutting position of the fabric, the fabric cutting mechanism was operated to cut the processing cloth by the knife holder 63 and the cloth cutting knife 62. It took more time by adding the operating time of the cloth cutting knife 62 or the knife holder 63.

SUMMARY OF THE INVENTION An object of the present invention is to shorten the cycle time from forming a buttonhole to forming a buttonhole in a buttonhole sewing machine that forms a cutting hole and a buttonhole in a fabric.

In order to solve the said subject, invention of Claim 1 is, for example, as shown to FIGS. 1-4,

The needle 14 moving up and down,

Cloth conveying means (e.g., X-axis motor 82, Y-axis motor) which is driven by electrical control and moves the conveyance table 16 on which the work cloth is placed on the upper surface in a direction orthogonal to the vertical movement of the needle. 83) and the like,

The cloth cutting means (for example, cloth cutting motor 95, etc.) which is driven by electrical control and cuts the workpiece | work cloth between them by lowering the cloth cutting knife 41 or the knife base 42 from the upper side of the said conveyance base. Equipped,                         

By the needle and the cloth conveying means, a buttonhole stitching (button hole stitch) stitch (e.g., Fig. 6) consisting of at least left and right straight portions (e.g., left and right sewing portions W1 and W3 shown in Fig. 6) is formed on the fabric. The knitting stitch W shown in Fig. 6 is formed, and then the processed cloth at the sewing end position is moved to the cloth cutting position where the cloth can be cut by the cloth cutting means by the cloth transfer means. In the buttonhole making machine for forming a buttonhole between the straight portion of the processing cloth on the conveying table,

The lowering of the cloth cutting knife or the cutlery starts before the processing cloth reaches the cloth cutting position, and after reaching the lower cutting position of the cloth cutting knife or the receiving tray in contact with the processing cloth, after reaching the cloth cutting position of the processing cloth It is characterized by including a control means (for example, the control device 110 including the CPU 113) for controlling the driving of the cloth cutting means to be.

According to the invention as set forth in claim 1, by means of the control means, the lowering of the cloth cutting knife or the knife tray starts before the processing cloth having the buttonhole knitting sweat reaches the cloth cutting position from the sewing end position. Since the driving of the fabric cutting means is controlled so that the arrival of the cut bottom in contact with the processing cloth is after the processing cloth is reached at the cutting position of the cloth, the time and the cloth moving from the sewing end position to the cutting position of the cloth It is possible to overlap the time when the cutting knife or the base of the knife descends, so that the cycle time until forming the button hole where the cutting is performed can be shortened, and the cloth cutting knife or knife is moved to the moving fabric. The base descends and does not cut off portions other than the buttonholes of the fabric.

In the invention according to claim 2, in the buttonhole making machine according to claim 1, for example, as shown in Figs. 5, 8, and 9,

The control means has setting means (e.g., operation panel 30) for setting lowering start data (e.g., setting contents of memory switch No. 11) which can set the lowering start timing of the cloth cutting knife or the knife base,

Based on the falling start data set by this setting means, the lowering of the cloth cutting knife or the knife base is started, and a buttonhole is formed in the processing cloth on the feed table.

According to the invention as set forth in claim 2, by the setting means of the control means, the lowering start data of the arbitrary starting cutting knife or the lowering timing of the knife base is set, and based on the lowering start data, the processing cloth on the feed table. Buttonholes can be formed in the In other words, in response to the thickness of the working cloth, the state set on the feed table, or the like, it is possible to set the start timing of the lowering of the cloth cutting knife or the knife base. Therefore, driving of the cloth cutting knife or the knife base is started at the most suitable timing according to the material and the setting state of the work cloth, and the cycle time can be shortened.

In the invention according to claim 3, in the buttonhole making machine according to claim 2, for example, as shown in Fig. 8,

The lowering start data is position data (e.g., setting contents of memory switch No. 11) for setting the position of the processing cloth between the sewing end position and the cloth cutting position on the basis of a predetermined position.

The control means is characterized by starting the lowering of the cloth cutting knife or the knife base at the point in time when the fabric that is being moved from the sewing end position to the cloth cutting position by the cloth transfer means reaches the set position.

According to the invention as set forth in claim 3, the fabric cutting knife moving from the sewing end position to the fabric cutting position after the sewing end of the buttonhole knitting stitch reaches an arbitrary position set by the setting means, Alternatively, by starting the lowering of the cutlery, it is possible to drive control such that the arrival of the cloth cutting knife or the knife holder to the lowered position in contact with the processed cloth is after the arrival of the processed cloth to the cloth cutting position.

Invention of Claim 4 is a buttonhole making machine of Claim 2, for example, as shown in FIG.

The falling start data is time data (e.g., setting contents of memory switch No. 11) that sets the time while the fabric is being moved from the sewing end position to the fabric cutting position on the basis of a predetermined time.

The control means is characterized by starting the lowering of the cloth cutting knife or the knife base when the set time is reached.

According to the invention according to claim 4, after the sewing of the buttonhole knitting sweat is finished, the lowering of the cloth cutting knife or the knife base is started when the processing cloth reaches an arbitrary time from the start of the movement from the sewing end position. The drive control can be such that the arrival of the cloth cutting knife or the knife base to the lowering position in contact with the processing cloth is after the arrival of the processing cloth to the cloth cutting position.

In the invention according to claim 5, in the buttonhole making machine according to claim 2, the lowering start data refers to the lowering position of the cloth cutting knife or the knife base when the processing cloth reaches the cutting position of the cloth, based on a predetermined upper and lower position. Falling position data to set as

The control means is characterized in that the driving of the cloth cutting means is started so that the lowered position of the cloth cutting knife or the knife holder when the processed cloth reaches the cloth cutting position is a set lowered position.

According to the invention as set forth in claim 5, the falling start data, which can set the falling start timing of the cloth cutting knife or the knife base set by the setting means, is the cloth cutting knife or the knife holder when the processing cloth reaches the cloth cutting position. Falling position data for setting the lowering position of the sheet on the basis of a predetermined up and down position. Based on the lowering position data, the lowering position of the cloth cutting knife or the base is started, The driving control can be suitably performed so that the arrival of the contacted lowering position is after the arrival of the fabric cloth to the cutting position of the fabric. That is, by setting the falling position data to a position according to the thickness of the processed cloth, for example, the time for moving from the sewing end position to the cloth cutting position and the time for the cloth cutting knife or the knife lowering to overlap more can be overlapped. As a result, the cycle time until the formation of the button holes subjected to the cutting can be shortened.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail with reference to drawings.                     

First, the configuration will be described.

A buttonhole making machine 10 which is an example of the present invention shown in Figs. 1 to 3 is an automatic eyelet sewing machine for forming a buttonhole at the same time as cutting the processing cloth. The trimming and buttonholes performed by the buttonhole making machine 10 are, for example, a button consisting of a droplet-shaped hole H1 and a notch H2 in the eyelet portion, as shown in Fig. 6A. Examples of the hole H and the knitting stitches W provided around the button hole H are given. On the other hand, the stitching sweat W consists of a right sewing part (straight line part) W1, a bird eye sewing part W2, a left sewing part (straight part part) W3, etc. Further, a straight bar tack stitch formed by dropping the needle in a direction orthogonal to the left and right sewing portions W1 and W3 behind the left sewing portion W3 may be provided.

The bird eye sewing machine 10 includes a bed portion 11 having a substantially rectangular box shape, a vertical fuselage 12 provided at a rear portion of the bed 11, and a bed portion from an upper portion of the vertical fuselage 12. 11) an arm portion 13 extending substantially parallel to the front, a feeder 16 for moving the object to be processed in the horizontal plane, a presser foot 17 for pressing a cloth on the upper surface of the feeder 16, and making a buttonhole A control device 110 (see FIG. 4) for controlling a series of operations of the sewing machine 10, and a cloth cutting knife 41 or a knife tray 42 above the cloth feed table 16 to form a buttonhole. Fabric cutting means (CPU 113, cloth cutting motor drive circuit 85a, cloth cutting motor 85, etc.) shown in FIG. 4 and the operation panel 30 (FIG. 5) and the like.                     

The needle bar 15 provided with the needle 14 in the lower end part is provided in the front head part 13a of the said arm part 13. As shown in FIG. The needle bar 15 is installed in the arm part 13 by the upper and lower sewing machines not shown and the needle bar upper and lower drive mechanisms driven by the upper axis. It is provided so that the needle rocking motion in the left-right direction (X direction of FIG. 2) is possible.

The upper shaft (not shown) is provided in the arm portion 13 in succession in the front-rear direction of the arm portion 13. In addition, although not shown in the bed part 11, the lower axis | shaft is provided in a row in the front-back direction. A main shaft motor (see FIG. 4) 81 is connected to the lower shaft. The lower shaft is connected to the upper shaft via a transmission mechanism provided with a timing belt. The rotational force of the lower shaft rotated by the main shaft motor is transmitted through the transmission mechanism to rotate the upper shaft. On the other hand, the needle swing mechanism is the same as the well-known thing with the conventional buttonhole making machine which can adjust a needle amplitude mechanically, and abbreviate | omits description.

Although not shown, the looper is provided in the bed part 11 just below the needle bar 15. This looper is connected to a lower shaft, not shown, and operates in synchronism with the vertical motion of the needle bar 15. Thereby, the chain stitch in a round bar is formed by cooperation with the needle bar 15 provided with the needle 14 in the lower end part. After the cutting is finished, the thread cutting device (not shown) cuts the yarn when the fabric is moved to the cloth cutting position by the movement of the cloth feed table 16 to the cloth cutting position.

In addition, the needle bar 15 and the looper are connected to a turning pulse motor (a turning motor 84 shown in Fig. 4) and a rotation mechanism 71 having a timing belt, and synchronously rotate about a vertical axis periphery. As a result, radial needle stitches (new eyelet sewing portion W2) are formed at the edges of the droplet-shaped eyelet H1 of the buttonhole H. FIG.

The conveyance table 16 is provided in the upper surface of the bed part 11, and the processing cloth is set. The presser foot 17 which presses the process cloth on both sides of the buttonhole which should be formed in this process cloth is provided in the upper surface of this cloth feed stand 16. As shown in FIG.

The cloth feed table 16 forms a thin rectangular box as a whole, and includes an X-axis pulse motor (X-axis motor 82 shown in FIG. 4) and a Y-axis pulse motor (in FIG. 4) provided in the bed portion 11. The conveyance mechanism (cloth conveying means) which consists of the Y-axis motor 83) etc. which are shown in figure can move to a left-right direction (X direction) and a front-back direction (Y direction) under control of CPU113.

The cloth cutting knife 41 mentioned later above and below the predetermined position to form a buttonhole in the processing cloth put on the upper surface in the state which was positioned at the predetermined | prescribed origin position in this cloth feeder 16 is mentioned. And cutlery 42 are set to be located. After sewing, the buttonhole H is formed at this position.

In other words, the fabric transfer table 16 moves to the sewing start position ahead of the origin position by the operation of the start switch 32 (see FIG. 4), and the working cloth placed on the cloth transfer table 16 ( Driven to move relative to the required position just below 14).

Cropping around the buttonhole H starts from the lower end of the right sewing portion W1 in FIG. 6A, passes through the eyelet sewing portion W2, and sews to the left sewing portion W3. Moreover, a straight bartack stitch part (not shown) is sewn as needed. In order to sew in this order, the cloth transfer table 16 moves to the sewing start position in the Y-direction, and from this sewing start position, the needle bar 15, the looper, and the like are driven synchronously, while the origin of the button hole H The tip end portion of the bird eye hole H1 is moved forward until the state corresponding to the needle 14 is reached, and then it is returned backward to the sewing end position which is almost the same as the sewing start position. And the processing cloth is moved to the position where a buttonhole is formed from a sewing end position.

Since the horizontal position (symbol L1 of FIG. 12) of the cloth cutting knife 41 or the knife base 42 and the needle 14 is fixed in these horizontal positions mechanically, the origin of the cloth feed stand 16 From the position (here, the cloth cutting position, which is the position at which the buttonholes can be formed in the fabric, to the origin position), the cloth transfer when the vertex of the buttonhole H becomes in a state corresponding to the needle 14 The movement distance in the Y direction (see Fig. 1) of the cloth transfer table 16 to the position of the base 16 is set to a constant value, for example, 64 mm. Therefore, the moving distance in the Y direction from the cloth cutting position (home position) of the cloth feed table 16 to the sewing start (end) position is the sewing length of the buttonhole H (ml of FIG. 6 (a) or FIG. 12). Corresponds to the value of L2), the longer the shorter, the shorter the longer.

When the knitting is finished, the cloth transfer table 16 is controlled to return from the sewing end position to the cloth cutting position where the button hole can be formed by the cloth cutting means. In addition, in this embodiment, when setting a sewing object, the cloth conveyance stand 16 is made to move to a predetermined setting position. In other words, the cloth transfer table 16 is capable of moving in the front-rear direction, that is, the Y-direction when viewed from the operator side while pressing the sewing material placed on the transfer table in conjunction with the vertical movement of the needle 14.

1, 2, and 4, the cloth cutting means is a cloth cutting knife 41 fixed to the bed portion 11 and a knife holder descending from above toward the cloth cutting knife 41 ( 42 and a cloth cutting motor 85 for driving the knife holder 42 up and down through a knife holder driving mechanism (not shown).

The cloth cutting knife 41 is arranged in the bed 11 at the rear of the position at which the looper for forming the needle stitches in the working fabric is driven together with the drive of the needle 14, and the transfer table 16 as described above. It is arranged at a position coinciding with the origin position of.

Then, the cloth feed motor 85 is driven so that the cut cloth 42 is placed in the state where the working cloth reaches the cutting position of the cloth, that is, the working cloth is disposed between the knife holder 42 and the cloth cutting knife 41. Is lowered toward the cloth cutting knife 41, the processing cloth set between the knife holder 42 and the cloth cutting knife 41 is cut | disconnected, and the buttonhole H is formed. On the other hand, in FIG. 3, in the buttonhole making machine 10, the position of the cloth feed stand 16 at the time of sewing completion and the cloth cutting knife 41 fixed to the bed part 11 are shown. .

On the other hand, the buttonhole making machine 10 includes a well-known upper thread cutting device and a lower thread cutting device, each of which cuts the upper thread and the lower thread. These upper thread cutting devices and the lower thread cutting device cut the upper thread and the lower thread in the same manner as in the past after sewing is finished. Moreover, the sewing machine provided with the upper thread clamp apparatus for holding and holding the edge part of the upper thread cut | disconnected by the said upper thread cutting device after formation of a buttonhole knitting sweat is known. The upper thread clamp device is for sewing the end of the thread sewn into the needle cleanly in the next knitting operation.

4, the control apparatus 110 of the sewing machine 10 is shown.

The control device 110 shown in FIG. 4 includes a ROM (Read Only Memory) 111, a RAM (Random Access Memory) 112, a CPU (Central Processing Unit) 113, an EEPROM (Electrically Erasable and Programmable Read Only Memory) 115 ) And so on.

The control panel 110 is connected to the operation panel 30, the presser foot switch 31, the start switch 32 via the interface (I / F) 114, and the main shaft motor 81 and the X-axis motor ( Cloth conveying means) 82, Y-axis motor (cloth conveying means) 83, swinging motor (turning means) 84, cloth cutting motor (cloth cutting driving means) 85, presser foot cylinder 86 and the like. Various actuators are connected.

Moreover, between the interface 114 and the main shaft motor 81, the X-axis motor 82, the Y-axis motor 83, the turning motor 84, and the cloth cutting motor 85, the main shaft for driving each motor The motor driving circuit 81a, the X-axis motor driving circuit 82a, the Y-axis motor driving circuit 83a, the swing motor driving circuit 84a, the cloth cutting motor driving circuit 85a are interposed, and the interface 114 A presser foot cylinder drive solenoid valve 86a is interposed between the presser foot cylinders 86.

In addition, the control device 110 includes an X for detecting the home position of each of the X-axis motor 82, the Y-axis motor 83, the turning motor 84, and the cloth cutting motor 85 through the interface 114. The axis origin sensor 82b, the Y axis origin sensor 83b, the swing origin sensor 84b, and the cloth cutting origin sensor 85b are connected.

The ROM 111 includes a main shaft motor 81, an X-axis motor 82, a Y-axis motor 83, a turning motor 84, a cloth cutting motor (cloth cutting driving means) 85, and a presser foot cylinder 86. The control program and control data for sewing a buttonhole by controlling various actuators, such as these, are recorded.

The RAM 112 (storage means) stores a plurality of pattern data, and stores one data selected through the operation panel 30 among these data. When the value of the pattern data is changed, the value after the change is also stored. In addition, the selection method of these data and the method of changing data content are mentioned later. Furthermore, the RAM 112 also functions as a memory area temporarily used in various processes during sewing. The needle stitch data generated from the pattern data is also stored.

The EEPROM 115 stores a plurality of memory switch data (see FIGS. 8 and 9). When the value of the memory switch data is changed, the value after the change is also stored.

As the pattern data, as shown in FIG. 7, for example, there are nine pattern data. As shown in the pattern data 1, specific values corresponding to data items 1 to 6 are set in each pattern data. have.

Data item 1 sets the shape of the new eye hole H1 of the button hole H. FIG. In other words, in this data item 1, knife Nos. 0 to 5 are set so-called standard knives, that is, knives (not shown) in which the bird's eye knife portion forming the bird's eye hole H1 and the straight knife portion are integrated. As shown in 6 (c), the size of the bird eye hole H1 is defined by the width ew and the height el, and the combination table of these width ew and height el is illustrated. As shown in 6 (b), the memory switch data is stored in the EEPROM 115 in advance as part of the above-described memory switch data (corresponding to memory switches Nos. 1 to 10 in FIG. 8). On the other hand, knife No. 0 corresponds to the knife provided only with the linear blade for forming a straight buttonhole. In data item 1, a number is selected from (1-5).

Data items 2 to 6 are data concerning the number of needles and the length of each part constituting the bird eye stitching sweat shown in Fig. 6A. That is, as shown in Fig. 6 (d), the data item 2 is the cutting length (ml), the data item 3 is the number of straight needles (ln), the data item 4 is the number of eyelets (en), and the data. Item 5 is for setting the straight part knife space ls, and data item 6 is for setting the eye hole knife space es, respectively. On the other hand, the knitting length ml corresponds to the data relating to the length L2 of the knitting stitch of the present invention (see Fig. 12).

In addition to the data indicating the size of the bird eye hole corresponding to the above No. (corresponding to the memory switches Nos. 1 to 10), the memory switch data is such that the lowering of the cut tray 42 reaches the cutting transition cutting position. The descent start, which can be set beforehand, can set the descent start timing of the cut tray 42 such that the arrival of the cloth cutting knife or the knife bottom in contact with the working cloth is after the arrival of the cloth cutting position. Data (setting data in memory switch No. 11).

Here, position data which sets the start of fall of a processing cloth between the sewing end position of a knitting and the said cloth cutting position as a start of fall, and sets this fall start position on the basis of a predetermined position. Is set as the setting contents of memory switch No. 11 shown in FIG. 8, and the start data of the descending fabric is cut from the sewing end position of the sewing cloth. The setting contents of the memory switch data when the time is set based on a predetermined time (hereinafter referred to as time control) so that the time starts to descend from the time while moving to The setting contents of the switch No. 11 are shown.

First, in the case of the position control shown in FIG. 8, it is input to the setting content of the memory switch No. 11 that the setting value with respect to the operation start position of the barrel 42 is 10.0 mm.

This memory switch No. 11 sets the position of the cloth feeder 16 for starting operation of the knife holder 42, and determines the arrival position of the feeder 16 where the knife holder 42 starts operation. Falling position data set based on a predetermined position.

As a predetermined position which becomes the reference | standard of the said operation | movement start setting value, it is preferable that it is a position which does not change according to the shape of needlework etc. set by the structure of a sewing machine, for example, a cloth cutting position. In this case, when the working cloth reaches a distance of 10.0 mm from the cloth cutting position, the driving of the knife holder 42 is started.

In this way, the CPU 113 sets the position data (set value) of the lowering operation start of the knife holder 42 on the basis of the cloth cutting position, and the CPU 113 sets the cloth cutting motor based on this position data. When the configuration of driving the 85 is performed, it is not necessary to change the setting of the lowering operation start of the blade holder 42 even if the length of the knitting to be sewn on the work cloth is changed. Therefore, regardless of the length of the trimming around the buttonholes formed in the fabric, the sewing cycle time of the trimming buttonholes can be shortened.

In the case of the time control shown in Fig. 9, the setting contents of the memory switch shown in Fig. 8 and the memory switches No. 1 to 10 are the same, but the setting contents of the memory switch No. 11 are not moved to the knife position. Before finishing, it is time data which sets the time while the process cloth is moving from the sewing sewing end position to the cloth cutting position as a reference to a predetermined time. On the other hand, as shown in FIG. 9, in this embodiment, the setting value is input in 100 ms.

As a predetermined time which becomes a reference | standard of a set value, it is suitable to set it as the time when the processing cloth moved by the conveying means, such as the X-axis motor 82 and the Y-axis motor 83, reaches a cloth cutting position. In this case, in the example of FIG. 9, the driving of the knife holder 42 is started 100 ms before the working cloth reaches the cloth cutting position.

In this way, the cloth cutting motor 95 is driven so that the lowering operation of the knife holder 42 is started in accordance with the setting value set by the CPU 113 to the memory switch on the basis of the time not changed according to the shape of the sewing or the like. In this configuration, even when the length of the yarns sewn on the work cloth is changed, the time at which the work cloth reaches the cutting position of the cloth is not changed by the feed table 16. In other words, it is not necessary to change the setting of the lowering operation start of the knife base 42. Therefore, regardless of the length of the trimming around the buttonholes formed in the fabric, the sewing cycle time of the trimming buttonholes can be shortened.

On the other hand, these memory switch numbers can be selected and changed by the operator via the data item key of the operation panel 30.

The CPU 113 controls a series of processes relating to buttonhole sewing in accordance with the control program and control data of the ROM 111. In particular, the CPU 113 reads the pattern data from the RAM 112 and sets the data contents, and at the same time, based on the set pattern contents and the control program, the main shaft motor 81, the X-axis motor 82, and the Y-axis motor ( 83), needle stitch data having the amount of cloth feed at each needle drop point, the amount of revolution of the needle, and the like are generated to drive the drive of the swing motor 84 and the like. This needle stitching data includes data such as needle drop data for determining the needle drop position of the needle 14, the driving amount of the cloth cutting motor 85 for driving the knife holder 42, and the like.

In addition, the CPU 113 controls the lowering operation start timing of the knife holder 42 by driving the cloth cutting motor 95 in accordance with the setting contents of the memory switch. In other words, when an arbitrary position is set by memory switch No. 11 of the memory switch shown in Fig. 8, the transfer table 16 starts moving to the cloth cutting position immediately after the end of the knitting, When the set position is reached, the cloth cutting motor 95 is driven to start the lowering of the knife holder 42. That is, the lowering of the cut tray 42 starts before the working cloth reaches the cutting position of the cloth, and the arrival of the cutting stand 42 in contact with the working cutting cloth after the reaching of the cutting cloth reaches the cutting position of the cloth. Control as possible.

In addition, when arbitrary time is set by memory switch No. 11 of the memory switch shown in FIG. 9, the CPU 113 starts moving to the cloth cutting position immediately after the cutting of the feed table 16 is finished. In this case, when the set time has been reached from the start of the movement of the feed table 16, the cloth cutting motor 95 is driven to start the lowering operation of the knife holder 42 descending toward the cloth cutting knife. That is, the lowering of the cut tray 42 starts before the workpiece cloth reaches the cloth cutting position, so that the arrival of the cut tray 42 in contact with the workpiece cloth after reaching the cloth cutting position is reached. Control as possible.

Furthermore, the CPU 113 is connected to the operation panel 30 via the interface 114 to control the display on the operation panel 30 and to receive an input signal input through the operation panel 30. It is to select and change various settings. Thereby, the operator can select each data shown in FIGS. 7-9, etc., or change the selected data via the operation panel 30. FIG.

The CPU 113 is connected to the main shaft motor drive circuit 81a via the interface 114 to drive control the rotation of the main shaft motor 81.

In addition, the CPU 113 is connected to the X-axis motor driving circuit 82a through the interface 114, and is connected to the Y-axis motor driving circuit 83c through the interface 114, thereby providing the X-axis motor 82. ) And the Y-axis motor 83 are driven to drive the feed table 16 in a predetermined direction.

The CPU 113 is connected to the swing motor drive circuit 84a via the interface 114 to control and drive the swing motor 84.

In addition, the CPU 113 is connected to the cloth feed motor drive circuit 85a via the interface 114 to control and drive the cloth feed motor 85.

Furthermore, the CPU 113 is connected to the start switch 32 via the interface 114, and when the start signal is input from the start switch 32, the CPU 113 drives the spindle motor 81 or the like at a predetermined timing. Allow for buttonhole breaking and cloth cutting.

In addition, when a signal is input from the presser foot switch 31 connected through the interface 114, the CPU 113 uses the presser foot cylinder drive solenoid valve 86 connected through the interface 114 to press the foot cylinder 86. Drive. The presser foot cylinder 86 (refer to FIG. 1) is moved up and down by this presser foot cylinder 86, and the cloth sewn to the cloth feeder 16 can be inserted and supported or released.

The CPU 113 also detects the origin of the X-axis motor 82, the Y-axis motor 83, the turning motor 84, and the cloth cutting motor 85 via the interface 114. It is connected to the origin sensor 82b, the Y-axis origin sensor 83b, the swing origin sensor 84b, the cloth cutting knife origin sensor 85b, and respond | corresponds to the signal which shows whether each motor returned to the origin position, Based on this signal, the home position of each motor is searched.

In other words, the CPU 113 detects the state of each sensor by the X-axis origin sensor 82b, the Y-axis origin sensor 83b, the swing origin sensor 84b, and the cloth cutting origin sensor 85b. By driving the axial motor 82, the Y-axis motor 83, the turning motor 84, and the cloth cutting motor 85, the movement position of the cloth feed table 16, the foundation of the needle bar 15, and the looper mechanism (shown) Turning angle, lowering position of the stand 42 and the like.

As shown in FIG. 5, the operation panel 30 which is the setting means in this invention is the pattern No. display part 30a, and the pattern No. +/- key 30b, data item display section 30c, data item +/- key 30d, data display section 30e, data +/- key 30f, data setting key 30g, and ready key ( 30h).

The pattern No. display part 30a displays the pattern No. currently selected ("1" in FIG. 5), and the pattern No. 30A is displayed. By changing the numbers one by one from the range of 1 to 9 by the +/- key 30b, other pattern data can be selected.

The data item display part 30c displays the data item in the pattern data selected by the pattern number display part 30a ("1" in FIG. 5), and the numbers 1-5 by the data item +/- key 30d. By changing one by one from the range, other data items can be selected.

When a data item is selected in the data item display unit 30c, a number set in advance for the data item is displayed on the data display unit 30e. The value can be changed by increasing or decreasing the number of the data display unit 30e by a predetermined interval within the predetermined range by the data +/- key 30f.

The data setting key 30g is a switch to operate when performing data setting work. That is, the data value can be changed by pressing the data setting key 30g. In addition, selection or change of each item or number is confirmed by pressing the data setting key 30g once again.

The preparation key 30h is a key for enabling preparation of the cutting operation and for creating needle stitch data or the like corresponding to the data value selected or reset after the setting operation is finished. The preparation key 30h also serves as a key for changing the operation mode to the memory switch mode for changing the memory switch data when the power supply key is pressed when the power is turned on.

In the memory switch mode, the data item display unit 30c displays the memory switch No., and the data item +/- key 30d functions as an update key of the No. displayed on the data item display unit 30c. The data display unit 30e displays the content corresponding to the memory switch No., and the data +/- key 30f functions as an update key of the memory switch contents.

Hereinafter, the flow of a knitting sweat formation operation is demonstrated using the flowchart of FIG.

First, when the operation key 30h is also turned on at the same time during the on operation of the main power supply (not shown) of the sewing machine, that is, in the case of YES in step S100, the flow advances to step S101 to set a memory switch to be described later. do.

If NO in step S100 or after setting memory switch data in step S101, the process proceeds to step S102.

In step S102, it is monitored whether or not the pattern No. +/- key 30b is operated. When the operation is on, that is, YES, the flow advances to step S103 and the pattern No. is updated.

If NO in step S102, or after updating the pattern No. in step S103, the flow advances to step S104.                     

In step S104, it is monitored whether or not the data setting switch is operated, and when it is turned on, that is, YES, pattern data is set in step S105. In this step S105, data setting in the set pattern data No. is performed via the operation panel 30. FIG.

If NO in step S104, or after setting data in step S105, the flow advances to step S106.

In step S106, the operation of the preparation key 30h is monitored. If it is not operated, i.e. NO, the process returns to step S102, and if it is operated, i.e., YES, needle stitch data for every needle or determination for actuation of the knife stand is generated in step S107. These data are data generated for driving a drive source of the spindle motor 81 or the like based on the set pattern data and the contents of the memory switch data, and the needle stitch data for each needle and the start of operation of the knife holder 42 are provided. In the case of position control using data, that is, the memory switch shown in FIG. 8, the amount of movement from the sewing end position of the cloth feed table 16 until the drive of the knife holder 42 is started, and also shown in FIG. 9. In the case of time control using a memory switch, the elapsed time from the start of the movement after the end of sewing of the cloth feed table 16 until the drive of the knife holder 42 is started is calculated.

Then, the presser foot 17 descends in step S108, and in step S109, each X / Y motor 82 for driving the cloth feed table 16, the needle bar 15, the looper part, and the knife holder 42. , 83), the turning motor 84, and the cloth feed motor 85 are driven to perform home search by the respective home sensors 82b, 83b, 84b, 85b. On the other hand, the origin position of the cloth feed table 16 by the X / Y motors 82 and 83 is the same position as the cloth cutting position. Then, in step S110, the presser foot 17 is raised to enable setting of the work cloth by the operator.

In step S111, when the operation of the presser foot switch 32 is monitored and turned on, that is, YES, the presser foot 17 is lowered in step S112. For example, the operator checks the press position of the cloth by the presser foot 17 and the like, and when it is necessary to adjust the position of the cloth, the operator presses the presser foot switch 32 again in step S113 to operate the presser foot ( 17) rises and returns to step S111.

If the presser foot switch 32 is not turned on in step S113, that is, NO, the operation of the start switch 32 is monitored in step S115, and if it is turned on, that is, YES, the process proceeds to step S116. do.

In step S116, the cutting operation is performed by driving the spindle motor 81, the X-axis motor 82, the Y-axis motor 83, and the turning motor 84, and the flow proceeds to step S117. On the other hand, the cutting operation of step S116 includes a series of operations such as moving the transfer table 16 to the sewing start position. On the other hand, the amount of movement of the conveyance table 16 changes with the length of the trimming of the pattern data. That is, there exists a fixed "distance of a needle position and a cloth cutting position" according to the structure of the buttonhole sewing machine 10 main body, and the distance which subtracted the knitting length from the distance becomes the movement amount of a conveyance stand.

Referring to FIG. 12, the distance from the needle position to the cloth cutting knife (which may be a matched knife base) in the Y direction is L1 (same as described above, for example 64 mm), and the length of the knitting. In the case of L2 (ml shown in Fig. 6), the amount of movement of the feeder for moving the cloth feeder 16 to move the fabric from the end of the sewing to the cloth cutting position becomes L1-L2.

After the end of the knitting operation, in step S117, the X-axis motor 82, the Y-axis motor 83, and the turning motor 84 are driven to position the cloth feed table 16, the needle bar 15, and the looper at the origin positions. Start to move back.

In step S118, if the control for starting the moving of the stand 42 is a position control based on the memory switch shown in Fig. 8, then the drive in step S107 is started from the start of the movement of the cloth feed table 16 in step S117. If the cloth transfer table 16 is moved by the movement amount calculated as the start data, or if it is time control based on the memory switch shown in Fig. 9, at step S107 from the start of the movement of the cloth transfer table 16 in step S117. If the time has elapsed by the calculated elapsed time, the process proceeds to step S119, where the cloth cutting operation and the lowering operation of the knife holder 42 are started in this embodiment. That is, it is determined whether the cloth transfer table 16 has reached the operation position set by the memory switch, or the time calculated by the time set by the memory switch from the start of operation.

Then, in step S120, it is determined whether or not the operation of the cloth feed table 16, the turning motor 84, and the operation of the knife holder 42 is finished, and monitoring until the end is finished. The presser foot 17 ascends, returns to step S111, and once again enters the operation monitoring state of the presser foot switch 32, and the above-described cutting operation is repeated by turning on the presser foot switch 32.

Hereinafter, in the control performed along the flowchart, the case of position control and the case of time control will be described in more detail.

First, the case of position control shown in FIG. 8 is demonstrated. Buttonhole making The distance in the Y direction between the position of the needle 14 and the fabric cutting position of the sewing machine, specifically, the distance in the Y direction to the distal end of the needle 14 and the knife holder 42 (see Fig. 12 (a)). Denotes L1 (for example, mechanically fixed at 64 mm), and the operation start position of the knife holder 42 set by the memory switch shown in FIG. 8 is L3 (for example, 10.0 mm). If the predetermined position serving as the reference for the set value of the start is the cloth cutting position as the origin, the movement amount as the stand holder operation determination data calculated by the CPU 113 in step S107 is set by the pattern data. It becomes L1-L3 (for example, 54 mm) irrespective of the float length L2.

Then, in step S118, the CPU 113 starts to move to the origin position of the cloth feed table 16 in step S117, and then the cloth feed table 16 moves L1-L3 (for example, 54 mm). It is judged by the number of pulses sent to the Y-axis drive motor 83 or not, and by the affirmation here, the drive of the knife holder 42 is started in step S119. On the other hand, the value of L1 used for the above-mentioned calculation is previously stored in the EEPROM 115. This value can also be changed by the operation panel or the like.

An example of such a position control will be described with reference to FIG. 12.                     

As shown in Fig. 12 (a), after cutting is finished, the fabric cloth being moved toward the cloth cutting position by the cloth feed table 16 is moved by L1-L3, and the cloth cutting position is set by the memory switch. When it reaches (the position shown with the broken line in FIG. 12 (a)), the knife base 42 starts descending toward the cloth cutting knife 41. As shown in FIG. Then, as shown in Fig. 12 (b), after the processed cloth moves to the cloth cutting position by the cloth cutting means, as shown in Fig. 12 (c), the knife holder 42 abuts on the processed cloth, A buttonhole is formed in this processed cloth. The timing of the operation | movement of the cloth feed stand 16 at that time, and the cloth cutting knife operation | movement (up-down movement of the knife base 42 in this embodiment) is shown in FIG. That is, the start of the lowering of the knife holder 42 by the control device 110 is performed at a predetermined position while the cloth feed table 16 is moving the distance of L1-L2. On the other hand, when the knife base 42 is matched with the cloth cutting knife 41, it is stopped for a predetermined time (for example, about 50 ms).

Thus, since the operation | movement of the cloth feeder 16 and the lowering motion of the knife holder 42 are overlapped, the lowering of the knife holder 42 starts after the cloth feeder 16 reaches | attained the cloth cutting position. Compared to the case, the overlapped cycle time (in this case, about 0.1 second) can be shortened.

Hereinafter, the case of time control shown in FIG. 9 is demonstrated. On the other hand, in the case of the position control mentioned above, although the operation start position of a knife base can be calculated by simple calculation, the well-known thread which hold | maintains the upper thread by pausing the movement of the cloth feeder between the sewing end position and the cloth cutting position. Application to the buttonhole making machine provided with an auxiliary device such as a clamp device is not necessarily suitable. That is, depending on the configuration of the sewing machine or the fabric cutting knife operation (lowering operation of the knife holder 42 in the present embodiment) set by the memory switch, this operation start position is a temporary position of the thread clamp device. It may become a position further away from the cloth cutting position, and the cloth cutting may be performed before the processing cloth reaches the cloth cutting position, and application may be difficult.

On the other hand, in the case of time control, it can apply also to the buttonhole making machine provided with such a thread clamp apparatus, without causing a problem. Therefore, description of the case of time control demonstrates to the sewing machine provided with the upper thread clamp apparatus.

On the other hand, the seal clamp device is provided with the seal clamp part 6 (refer FIG. 14) which catches an upper thread, and the up-and-down drive part (not shown) which moves the seal clamp part 6 up and down. The seal clamp portion 6 is configured to be able to be clamped by, for example, a clamp cylinder (not shown), and the clamp cylinder is connected to the CPU 113 by a solenoid valve (not shown). Is controlled by In addition, the vertical drive unit includes, for example, an air cylinder (not shown) in the CPU 113 through a solenoid valve (not shown), and the air cylinder is driven by the control of the CPU 113 to seal the seal clamp unit. It is comprised so that 6 may be moved up and down.

Also in such a buttonhole sewing machine, the distance in the Y direction between the position of the needle 14 and the cloth cutting position, specifically, the distance in the Y direction to the distal end of the needle 14 and the knife holder 42 (FIG. 14 (a). ) Is the same as the sewing machine in the case of the position control described above, and is set to L1 (for example, 64 mm). In addition, the length of the cut set by the pattern data is set to L2 (e.g., 10 mm to 38 mm), the moving speed of the cloth feed table 16 is S1 (e.g., 30 mm / sec), and the processing transition cloth reaches the cutting device. On the basis of the time to be set, the moving time of the cloth feed table 16 to the cloth cutting position is set to T1 (for example, 100 ms) for the set time (see FIG. 9) of the start of the operation of the knife holder 42 set by the memory switch. T2 (e.g., mechanically fixed at 150 ms) for the seal clamp operation time (for example, a series of operation times for lowering and then raising the seal clamp portion 6 of the seal clamp device shown in Fig. 14) fixed by the machine. ), The total travel time t1 required for the movement of the cloth feed table is 1.3 sec when t1 = (L1-L2) / S1 (e.g., L1 = 64 mm, L2 = 24 mm, S1 = 30 mm / sec). do.

Therefore, the elapsed time t as the stand holder operation determination data calculated by the CPU 113 in step S107 is

t = (travel time to cloth cutting position + thread clamp operation time-set time),

t = (t1 + T2-T1)... (One)

(E.g., t = 1 = 1.3 sec, T2 = 150 mm, T1 = 100 mm, t = 1.35 sec).

Then, the CPU 113 determines whether the elapsed time t (for example, 1.35 sec) has elapsed since the movement to the origin position of the cloth feed table 16 starts in step S117 in step S118. In response to the affirmative determination here, the driving of the cloth cutting knife (the blade holder 42 in the present embodiment) is started in step S119. On the other hand, values such as L1, S1, T2 and the like used in the above calculation are stored in advance in the EEPROM 115. These values can also be changed by the operation panel or the like.

In addition, an example of the case of time control mentioned above is demonstrated with reference to FIG. 14 as what is comprised by the buttonhole making machine 10 provided with the well-known thread clamp apparatus as mentioned above, for example. The timing of the operation | movement of the cloth feed table at this time, the operation | movement of a seal clamp device, and cloth cutting operation | movement are shown in FIG.

In a buttonhole sewing machine provided with a thread clamp device, as shown in Figs. 14A to 14C, immediately after the end of the knitting, the cloth feed table 16 moves the fabric to the cloth cutting position direction. Move it. In the meantime, the cloth conveyance stand 16 pauses at the thread clamp position where a thread is clamped by the thread clamp part 6, and moves to the cloth cutting position after the upper thread is clamped by the thread clamp part 6. The knife base 42 at that time is controlled to start after a predetermined time elapses from the start of the movement of the fabric cloth to the cutting position of the fabric.

Thus, by overlapping the operation time of the knife base 42 which forms a buttonhole in the process cloth, and the movement time to the cloth cutting position of the cloth feed stand 16, the cycle time is shortened only by overlapping, unlike the conventional one. You can do it.

Moreover, in the case of such time control, even if the cloth feed table 16 is stopped in the middle, the start time of the knife holder 42 can be determined in consideration of this stop time, so that it is also applicable to a sewing machine provided with a thread clamp device. It is supposed to be. Also in this case, even if the length of the knitting formed in the work cloth is changed, the time at which the work cloth reaches the cutting position of the cloth is not changed by the cloth feed table 16. In other words, by the CPU 113 performing control corresponding to the cutting length, even if the cutting length is changed, the buttonhole is formed at an optimum timing without changing the setting of the lowering operation start of the knife holder 42. The sewing cycle time can be shortened.                     

In the description of the time control described above, an example in the case of applying to a sewing machine equipped with a thread clamp device has been described. However, in the case of time control, even if the thread clamp device is not provided or is also provided. Similarly, when the seal clamp operation time is set to 0 even when not in use, the same effects as described above can be obtained.

In addition, since the X direction position of the sewing end position of the process cloth is different from the center position of the cloth cutting knife normally, in the movement of the process cloth from the sewing end position (knitting end position) to the cloth cutting position, it is a process cloth. The X-axis motor 82 is also slightly driven to move the position where the buttonholes of the to be formed to the center position of the cloth cutting knife. In the above embodiment, the X-direction movement distance in this case is smaller than the Y-direction movement distance, and this calculation is performed assuming that the movement in the X direction is made during the movement in the Y direction of the cloth feed table 16. According to the position of the processed cloth after finishing sewing, it is determined whether the moving distance or the moving time in the movement to the cloth cutting position is longer in the X and Y directions, and the above calculation is performed for the longer moving direction. You can do it.

The flow of the memory switch setting in step S101 will be described below using the flowchart of FIG.

First, in step S200, "1" is displayed on the item display unit 30c of the operation panel 30, and the setting value of the memory switch No. 1 is displayed on the data display unit 30e.

Then, the operation of the data item +/- key 30d is monitored in step S201, and when it is turned on, that is, YES, the memory switch No. is updated in step S202, and the updated memory switch No. . Is displayed on the data item display section 30c, and a corresponding set value is displayed on the data display section 30e.

If NO in step S202 or NO in step S201, the flow proceeds to step S203.

In step S203, the operation of the data +/- key 30f is monitored, and when it is turned on, that is, YES, it corresponds to the memory switch No. displayed on the data item display unit 30c in step S204. One set value is updated, and the set value after the update is displayed on the data display unit 30e.

If NO after step S204 or NO in step S203, execution proceeds to step S205.

In step S205, the operation of the preparation key 30h is monitored, and if it is not turned on, that is, if NO, the process returns to step S201. If it is turned on, that is, if it is YES, the process proceeds to step S206 and is set. The memory switch data is stored in the EEPROM 115, and then the flow proceeds to step S102.

According to the buttonhole sewing machine 10, the operation start time of the knife holder 42 can be set during the movement of the feed table 16 from the end of the knitting position to the cutting position of the cloth through the operation panel 30, It is possible to overlap the movement of the feed table and the operation of the knife holder 42, and to shorten the cycle time until the cutting of the work cloth and the formation of the buttonholes.

In addition, by setting the memory switch stored in the EEPROM 115 via the operation panel 30, it can be set at any position of the conveyance table 16 or at any time, and it is suitable to correspond to the sewing product to which buttonhole sewing is performed. Can be set to work.

On the other hand, in the buttonhole making machine 10, when the overlapping operation is not performed, that is, when the selection of the overlapping operation is not selected, for example, in the case of position control, the set position = 0, in the case of time control When setting time = 0, it can control so that the knife base 42 may operate after the feed table 16 moves to the cloth cutting position.

In the buttonhole making machine 10, the timing of the start of operation of the knife holder 42 is set to the predetermined position itself of the transfer table 16 moving to the cloth cutting position immediately after the end of sewing. , For example, by setting the position at which the operation of the knife holder 42 starts to be stepped in advance as the distance from the cloth cutting position, and selecting these stepped positions as appropriate, the operation start position of the knife holder 42. It may be controlled. For example, it can also be set as the structure which provided the dip switch which can be set to 0 mm, 5 mm, 10 mm, and 15 mm from a cloth cutting position to a very close position. The configuration of the dip switch in this case is provided with two switches that can be selected from 5 mm and 10 mm, and can be set in steps of 0 mm, 5 mm, 10 mm, and 15 mm by a combination of these on and off.

Furthermore, instead of setting the position by the memory switch, the feed table 16 driven by the pulse motor is provided with a sensor that changes the signal when the operation position of the blade holder 42 is reached. The drive of the knife holder 42 may be controlled based on the detected positional information. In this case, the selection means may be enabled / disabled for sensor detection, or the like. Furthermore, the encoder may be used to output the position by the encoder, and the driving start control of the knife holder 42 is controlled based on the output signal. It does not matter.                     

In addition, in the buttonhole making machine 10, the timing of the start of the operation of the knife holder 42 is set to be any time of the elapsed time itself from immediately after the end of sewing until the movement to the cloth cutting position. Alternatively, for example, a dip switch or the like may be used to select and set in steps such as 0 ms, 50 ms, 100 ms, and 150 ms. The configuration of the dip switch in this case is provided with two switches capable of selecting 50 ms and 100 ms, and a configuration that can be set stepwise to 0 ms, 50 ms, 100 ms and 150 ms by the combination of these on and off.

In the buttonhole sewing machine 10, the memory switch WHEREIN: The position of the predetermined | prescribed conveyance stand 16 which moves immediately after sewing end, and the elapsed time from immediately after sewing end are set, respectively, and the predetermined position or When the elapsed time has been reached, the control device 110 drives the control to start the lowering operation of the knife holder 42. However, the data of the lowering operation start of the knife holder 42 for each pattern of the button holes, again. That is, you may have data of the elapsed time at the time of moving to the cloth cutting position from the position of the conveyance base 16 which starts the lowering operation of the knife base 42, or just after the sewing of the conveyance base 16 is finished. At this time, the predetermined position or the predetermined time serving as a reference when setting the position or time can correspond to the buttonhole, so that the predetermined position or the predetermined time serving as the reference is changed from the sewing end position or the sewing end position. It can also be set as the start timing of the movement of the conveyance stand 16 to a cutting position.

Furthermore, in the buttonhole making machine 10 according to the present embodiment, the predetermined positions of the transfer trays 16 which move immediately after the end of sewing and the elapsed time immediately after the end of sewing are set, respectively, to the predetermined positions. When the elapsed time has been reached, the control device 110 controls the drive to start the lowering operation of the knife holder 42. However, the position of the lowering position of the knife holder 42 is not limited thereto. You may set it.

That is, the lowering start data which can set the lowering start time of the knife base 42, and sets the lowering position of the knife base 42 when the processing cloth reaches the cloth cutting position on the basis of a predetermined up-down position. The control apparatus (2) is configured so that the position data can be set by the memory switch, and the lowering position of the cut tray 42 when the processing cloth reaches the cutting position of the cloth is set to the lowering position based on the set lowering position data. 110 starts the lowering of the knife tray 42, and the arrival of the knife holder 42 to the lowered position in contact with the workpiece cloth is after the arrival of the workpiece cloth to the cloth cutting position. It is a structure which controls to form a buttonhole in a.

In the case of this control (hereinafter referred to as height control), a predetermined up and down position serving as a reference for the set lowering position (hereinafter referred to as the set height) is opposed to, for example, the descending knife holder 42. Supposing the upper edge of the cloth cutting knife 41, since this upper edge is almost the same height as the mounting surface of the processing cloth, the operator can input a numerical value based on the thickness of the processing cloth as this set height. In contrast to the above-described position control or time control, the setting can be easily performed.

In this way, immediately after the processing cloth reaches the cutting position of the fabric, the knife holder 42 can be lowered to a set height, i.e., a height in contact with the processing cloth. It is easily possible to reliably prevent the cutting of the fabric.

This control is implemented, for example, by the CPU 113 performing the following calculation and processing. When the cloth is placed, i.e., the set height set by the memory switch with respect to the top edge of the cloth cutting knife is lowered until p and the knife holder 42 at the highest ascending position matches the cloth cutting knife 41. If the total descent distance of F is F and the descent time required for the descent of the entire descent distance F is T3, the upper edge of the cloth cutting knife 41 after the knife holder 42 in the highest ascending position starts to descend. The time Td from the part (that is, the processing cloth placing surface) to the set height p is calculated by the following equation.

Td = T3 (F-p) / F

Subsequently, this time Td is replaced with the setting data T1 of the blade operation start time of the equation (1) in the case of the above-described time control as the blade drive operation determination data. The elapsed time t from the start of the movement of the fabric cloth to the cloth cutting position is calculated.

t = (t1 + T2-Td)

On the other hand, it is assumed that the total fall distance F and fall time T3 used for the calculation are stored in the EEPROM 115 in advance.

And the CPU 113 performs the same control as the case of time control mentioned above based on this time t, and the falling position of the knife base 42 when the workpiece | work cloth reached | attained the cloth cutting position before it is settled. The driving of the knife tray 42 can be started so that the set position is lowered. This control is also suitable for a buttonhole sewing machine equipped with a thread clamp device, as in the case of the time control described above, since the timing of starting the drive of the knife holder 42 is determined according to time.

Further, in the case of a buttonhole sewing machine having a configuration in which the processing cloth is moved without stopping temporarily when the processing cloth is moved from the end of the knitting to the cutting position of the cloth, the operation of the knife holder is performed using the time Td described above. The position L4 of the cloth feed table at the start is calculated by the following equation.

L4 = Td × S1 (where S1 is the moving speed of the cloth feeder)

Subsequently, this L4 is replaced with L3 in the case of the position control described above to calculate the movement amount as the judgment data for the start of the stand receiving, and the CPU 113 calculates the movement amount as described above based on the calculated values L1-L4. As in the case of the one position control, during the movement of the cloth feed table 16, the knife holder (in order to reach the lowered position in contact with the workpiece fabric of the knife holder 42 after the arrival of the workpiece cloth to the cloth cutting position), The lowering of 42) is initiated to form buttonholes in the fabric on the fabric feed table 16.

Also in the case of the height control as described above, similarly to the case of the position control or the time control described above, even if the length of the knitting to be sewn to the work cloth is changed, the setting of the start of the lowering operation of the knife holder 42 is changed. no need. Therefore, regardless of the length of the trimming around the buttonholes formed in the fabric, the sewing cycle time of the trimming buttonholes can be shortened. In addition, in the said calculation, although the up-down position used as the reference | standard of a set height was made into the upper edge part of the cloth cutting knife 41, ie, the cloth mounting surface, even if the up-down position of a reference | standard is made into the highest raising position of the knife base 42, do.

In addition, this invention is not limited to the said embodiment, It can change suitably.

For example, the RAM 112 stores pattern data, and the EEPROM 115 stores memory switch data. For example, the RAM 112 stores memory switch data, and the EEPROM 115 stores pattern data. The RAM 112 or the EEPROM 115 may store both the pattern data and the memory switch data. It is also possible to use a floppy (registered trademark) disk instead of the EEPROM 115.

In addition, although the up-and-down movement of the knife base 42 is performed by controlling the drive of the cloth cutting motor 85, it is not limited to this, For example, well-known actuators, such as an air cylinder, can also be used. In addition, the number of pattern data, the number of data items, the number of memory switches, the operation method of the operation panel 30, etc. can be changed suitably. On the other hand, the number of pattern data may be one.

Furthermore, in the above embodiment, a plurality of pattern data are stored and one of them is selected to generate needle stitch data, but a plurality of needle stitch data may be stored in the RAM 112.

Alternatively, a plurality of pattern data and needle stitch data corresponding to each pattern data may be stored. In that case, when the pattern data is selected, the needle stitch data may be automatically specified.

On the other hand, in this embodiment, although the case where the knife base 42 was arrange | positioned upwards and made it drive down with respect to the cloth cutting knife 41 arrange | positioned below was shown, on the contrary, the cloth cutting knife 41 is upward It may be arrange | positioned at the side, and the knife base 42 may be arrange | positioned below and the cloth cutting knife 41 may be made to drive down.

Moreover, in the said embodiment, it was set as the fall start data which can set the fall start time of a knife base, and it was set as the structure which is performed separately from the case of position control, the time control, and the height control, respectively, but such control is made. It may be configured to be able to be carried out, and may be configured to be able to select these controls according to the processing cloth, sewing conditions and the like.

In addition, of course, the shape of specific component can also be changed suitably.

According to the invention as set forth in claim 1, the time traveled from the sewing end position to the fabric cutting position and the time when the cloth cutting knife or the knife lowering can be overlapped to form a buttonhole subjected to cutting by that amount. It is possible to shorten the cycle time to the above and at the same time, the cloth cutting knife or the knife stand descends to the moving work cloth, so that parts other than the buttonholes of the work cloth are not cut.

According to the invention as set forth in claim 2, by using the setting means, the lowering start data of the lowering start timing of the cloth cutting knife or the knife base is set, and a buttonhole is formed in the processing cloth on the feed table based on the lowering start data. As a result, the start time of starting the lowering of the cloth cutting knife or the base of the cloth can be shortened according to the thickness and setting state of the fabric, thereby shortening the cycle time for forming the buttonhole.

According to the invention of Claim 3, the same effect as the invention of Claim 2 can be acquired, and the process cloth which is moved from the sewing end position to the cloth cutting position after sewing of buttonhole knitting is set by a setting means. At the point at which one arbitrary position is reached, the lowering of the cloth cutting knife or the knife tray is started so that the arrival of the cloth cutting knife or the knife holder to the lowered position in contact with the processing cloth is after the reaching of the cloth cutting position. The drive control can be such that

According to the invention described in claim 4, the same effect as the invention described in claim 2 can be obtained, and at the time when the processing cloth reaches an arbitrary time from the start of movement from the sewing end position, By starting the lowering of the cloth cutting knife or the knife holder, the drive control can be performed such that the arrival of the cloth cutting knife or the knife holder to the lowered position in contact with the processing cloth is after the arrival of the cloth cutting machine to the cloth cutting position.

Further, according to the present invention, in the case of a buttonhole making machine provided with an auxiliary device such as a thread clamp device, even when the processing cloth moving from the sewing end position to the cloth cutting position is temporarily stopped, it is reliably arbitrary. At the point of arrival, the lowering of the cloth cutting knife or the knife tray is started so that the arrival of the cloth cutting knife or knife holder to the lowered position in contact with the processing cloth is after the arrival of the cloth cutting position of the cloth cutting knife. Can be controlled.

According to the invention described in claim 5, the falling start data which can obtain the same effect as the invention described in claim 2, and which can set the falling start time of the cloth cutting knife or the knife base, is set by the setting means. Falling position data which sets the lowering position of the said cloth cutting knife or the knife base on the basis of a predetermined lowering position when the cutting position is reached, Based on this lowering position data, the lowering of the said cloth cutting knife or the knife holder By starting, the drive control can be suitably controlled so that the arrival of the cloth cutting knife or the knife base to the lowered position in contact with the processing cloth is after the arrival of the processing cloth to the cloth cutting position. In other words, by setting the lowering position to an arbitrary position, it is possible to overlap the time for moving from the sewing end position to the cloth cutting position and the time when the cloth cutting knife or knife holder descends for more time, It is possible to shorten the cycle time until the formed buttonholes are formed.

Claims (5)

With the needle moving up and down, Cloth conveying means which is driven by electrical control and moves the conveying table on which the working fabric is placed on the upper surface in a direction orthogonal to the vertical movement of the needle; A cloth cutting means driven by a cloth cutting motor to cut the work cloth placed between the cloth cutting knife and the knife holder by lowering the cloth cutting knife or the knife holder from above the feed tray, By the needle and the cloth conveying means, a buttonhole knitting stitch formed of at least right and left straight portions is formed on the processed cloth, and then, by the cloth conveying means, the processed cloth at the sewing end position by the cloth conveying means. A buttonhole sewing machine, which moves to a fabric cutting position where fabric cutting is possible, and forms a buttonhole between the straight portions of the processing cloth on the feed table by the cloth cutting means, The lowering of the cloth cutting knife or cutlery starts after the fabric is started moving to the cloth cutting position by the cloth conveying means and before the cloth cutting position is reached. And control means for controlling the driving of the cloth cutting motor so that the reaching of the lowering position in contact with the lower end is after the reaching of the cutting position of the fabric. The method of claim 1, The control means has setting means for setting the descent start data which can set the descent start time of the cloth cutting knife or the cut tray; And a buttonhole is formed in the processing cloth on the feed table by starting the lowering of the cloth cutting knife or the knife base based on the drop start data set by the setting means. The method of claim 2, The lowering start data is position data for setting the position of the processing cloth between the sewing end position and the cloth cutting position on the basis of a predetermined position, The control means is for starting the lowering of the cloth cutting knife or the knife base when the processing cloth being moved from the sewing end position to the cloth cutting position by the cloth transfer means reaches the set position. Buttonhole making sewing machine characterized by. The method of claim 2, The falling start data is time data for setting the time while the processing cloth is moved from the sewing end position to the cloth cutting position on the basis of a predetermined time, And the control means starts the lowering of the cloth cutting knife or the knife base when the set time is reached. The method of claim 2, The lowering start data is the lowering position data for setting the lowering position of the cloth cutting knife or the knife base when the processed cloth reaches the cloth cutting position, based on a predetermined upper and lower position, The control means starts the driving of the cloth cutting means such that the cloth cutting knife or the lowering position of the knife receiving when the processed cloth reaches the cloth cutting position is a set lowering position. Making sewing machine.

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