KR20020069133A - A sewing machine for overlocking botton holes - Google Patents

Abstract

PURPOSE: Provided is a buttonholing sewing machine which satisfies requests for various methods of sewing and designs by making the drive source for a thread cutter independent from other mechanisms. CONSTITUTION: The buttonholing sewing machine is characterized by comprising the parts of: a needle thread cutter(70) with needle thread cutting scissors(80) for cutting and holding a needle thread; a bobbin thread cutter(50) with bobbin thread cutting scissors(52) for cutting and holding a bobbin thread; solenoids(76) and 66 for releasing the holding of the needle thread and the bobbin thread; a control panel for inputting and setting the form of buttonholing and the starting position and ending position of sewing; the RAM for storing data inputted from the control panel; and a CPU. The CPU reads out the data in the RAM, relatively moves a needle and a presser means by a Y feeding drive means and a needle oscillating mechanism, and after sewing from the starting position to the ending position, operates and controls the needle thread cutter(70) and the bobbin thread cutter(50) to cut, hold and release the hold of the needle thread and the bobbin thread.

Description

Button hole making sewing machine {A SEWING MACHINE FOR OVERLOCKING BOTTON HOLES}

The present invention relates to a buttonhole sewing machine.

Background Art A buttonhole sewing machine is known in which a buttonhole is formed for a to-be-sealed object and a yarn is cut around it. In the button hole sewing machine, the seam is formed by entanglement between the upper and lower sides while sending a to-be-sealed object fixed by cloth pressing or the like in a predetermined direction by a cloth transfer mechanism.

The sewing machine is formed with a thread cutting device for cutting each of the upper thread and the lower thread by scissors after forming a seam. Conventionally, the upper and lower thread cutting device is configured to cut a thread by scissors in association with a mechanism for raising the cloth pressing portion by the operation of the operation lever. After cutting, the upper thread and the lower thread were fixed with scissors, and the sewing thread was naturally rolled into the seam by opening the scissors at a certain timing by mechanically interlocking with the cloth feed mechanism at the next sewing start. That is, in the conventional button-hole sewing machine, the cloth transfer plate of the cloth transfer mechanism is interlocked to move to a certain position after starting sewing, thereby releasing the fixing of the upper and lower sides by the thread cutting device.

When the sewing is finished at a position different from the predetermined sewing start position in the sewing machine as described above, the cloth transfer plate or the cloth transfer mechanism is in a state of not mechanically returning to the original position. When the next sewing is started in that state, the release timing of the scissors was shifted, and the length of the yarn left on the cloth could not be controlled, and the seam of the yarn could not be neatly wrapped in the seam, causing problems.

For example, if the upper thread and the lower thread are cut at the fabric feed position where the upper thread and the lower thread can be released, the thread fixing defect occurs because the upper thread and the lower thread are released at the time of the fabric pressing rise, and the thread fixing is a characteristic of this kind of sewing machine. When it was not done, there was also a problem that the thread could not be sewn out of the needle and start sewing the next cycle.

For this reason, there is a problem in the conventional sewing machine because the sewing end position must match the sewing start position.

In recent years, it is known that the button-hole sewing machine is electronically controlled and has a lot of variations of the sewing pattern. However, in order to reliably process the sewing start thread as described above, the sewing start position must be sewn to the sewing start position. After sewing, the sewing must be sewn again to the sewing start position, so the seam of the sewing product is not good, and there is a concern that the value of the commodity may be lowered and the cycle time increases.

Also, depending on the sewing object, sewing may be completed in a manner in which a buttonhole is formed (sun blade) prior to the formation of the knitting. Moreover, a sewing machine is known that performs a plurality of cloth cutting operations while sending a cloth by a cloth feed mechanism when the button hole side to be formed is longer than the scalpel length of the cloth cutting blade forming the button hole.

In the case of sewing by sun-mesh by such a sewing machine, when the cloth is sent for cutting the cloth, scissors open and the thread falls off, so that the fabric is impossible to fix the seam at the next sewing start. For this reason, even when the sun-mesh side is at the time of preferable sewing, the button hole must be formed after cutting off.

In addition, it is impossible to perform the thread cutting operation while pressing the cloth with the cloth pressing part according to the design of the sewing material by the rise of the cloth pressing and the thread cutting operation.

As described above, in the conventional button hole sewing machine, since the thread cutting device is linked to other mechanisms, there are many restrictions on the operation time and the like, and the sewing method and design variety cannot be sufficiently met.

SUMMARY OF THE INVENTION An object of the present invention is to provide a button-hole sewing machine capable of satisfying the requirements of various sewing methods and designs from the prior art by making the thread cutting device independent of other mechanisms.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the external appearance of the buttonhole thread sewing machine as an example of this invention.

Fig. 2 is a perspective view mainly showing the cloth feeding mechanism and the needle lifting mechanism of the button hole cutting machine of Fig. 1;

3 is a perspective view mainly showing the elevating mechanism and the needle vibration mechanism of the needle of the button hole cutting machine sewing machine of FIG.

4 is a plan view showing the upper thread cutting device.

5 is an exploded perspective view of the upper thread cutting device and the lower thread cutting device.

6 is a side view showing the upper thread cutting device.

7 is a schematic view for explaining the operation of the upper thread cutting device and the lower thread cutting device.

8 is a bottom view illustrating the lower thread cutting device.

FIG. 9 is a block diagram showing a control circuit of the button hole cutting sewing machine of FIG. 1; FIG.

10 is a front view of the operation panel.

Fig. 11 is a data table showing parameters that can be input from the operation panel.

FIG. 12 is a view explaining correspondence between data items in FIG. 11 and button hole breaking; FIG.

Figure 13 is a view for explaining setting the sewing start position and the sewing end position to another position.

Fig. 14 is a view showing a case where a large cloth pressing part is used, (a) shows a shape of two consecutive sewing, and (b) shows a shape of sewing at an arbitrary setting position with respect to the cloth pressing part.

Fig. 15 is a perspective view for explaining the merit of sewing at an arbitrary setting position with respect to the cloth pressing portion.

Fig. 16 is a diagram showing a table for correcting the timing of releasing the fixing of the upper thread and the lower thread in accordance with the rotation speed.

Fig. 17 is a diagram showing a data table for heterogeneous pattern continuous sewing.

Fig. 18 shows the general flow of button hole cutting.

Fig. 19 is a flowchart of the sewing process in Fig. 18.

20 is a flowchart showing the release process of the upper thread and the lower thread at the start of sewing.

Fig. 21 is a flowchart showing a heterogeneous pattern continuous sewing process.

Fig. 22 is a plan view showing the upper thread cutting device in the buttonhole knitting machine of the second embodiment.

Figure 23 is an exploded perspective view of the upper thread cutting device of Figure 22;

Fig. 24 is a bottom view showing the lower thread cutting device in the buttonhole sewing machine of the second embodiment;

Fig. 25 is an exploded perspective view showing the lower thread cutting device of Fig. 24;

※ Explanation of symbols about main part of drawing ※

1: buttonhole sewing machine 5: sewing machine motor

6: upper axis (spindle) 9: needle

12: North 13: Y feed drive means

15,15 ': fabric presser 50,230: lower thread cutting device (lower thread cutting means)

52: bobbin shear 66: solenoid (operating means)

70,200: upper thread cutting device (upper thread cutting means) 76: solenoid (operating means)

80: upper thread scissors 100: operation panel

110: control circuit 111: CPU (control means)

112: ROM 113: RAM (memory means)

122: position sensor on the needle 123: TG generator (detection means)

In order to solve the above problems, the invention described in claim 1 is, for example, as shown in Figs.

The upper thread passes, and the needle 9 which moves to and from the sewing object by the rotation of the main shaft (upper shaft 6), the drum 12 which supplies the lower thread in the lower part of the sewing object, and presses the cloth to press the sewing object. Means (cloth pressing portion 15, transfer sheet 14), and moving means (Y feed driving means 13 and needle) for relatively moving the needle and the cloth pressing means to form a knitting seam around the buttonhole. Vibration mechanism), an upper thread cutting means (upper thread cutting device 70) having an upper thread scissors 80 for cutting the upper thread and fixing the upper thread after cutting, and a lower thread scissors 52 for cutting the lower thread and fixing the lower thread after cutting. In the buttonhole knitting machine provided with a lower thread cutting means (lower thread cutting device 50) having:

Operating means (solenoids 76 and 66) for performing the release of the upper thread fixation by the upper thread scissors, the release of the lower thread fixation by the lower thread scissors, and the shape of the button hole cutting as the button hole cutting data An input means (operation panel 100) for inputting a sewing start position and a sewing end position; a storage means (RAM 113) for storing button hole cutting data input from the input means; and a button stored in the storage means. Read the hole cutting data and move the needle and cloth pressing means by the moving means and sew from the sewing start position to the sewing end position, and then operate the upper thread cutting means and the lower thread cutting means to cut, fix and It is a button-hole sewing machine characterized in that it comprises a control means (CPU 111) for releasing.

According to the invention as set forth in claim 1, an actuating means is provided for releasing the upper thread fixation by the upper thread scissors and the release of the lower thread fixation by the lower thread scissors. The upper thread and the lower thread release are operated by independent driving sources. As a result, the restrictions caused by the cloth transfer mechanism are eliminated as in the prior art. Accordingly, as described in claim 1, the sewing start position and the sewing end position can be set through the input means to form a seam that is different from the sewing start position and the sewing end position under the control of the control means.

Therefore, the unnecessary sewing drop for matching the sewing end position to the sewing start position is eliminated, the appearance is improved by that, the quality of the sewing product can be improved and the cycle time can be shortened.

In addition, since the drive source and the fabric feed device for thread release are separated in this way, the sun knife which forms a buttonhole while sending a cloth before sewing becomes possible.

According to the invention described in claim 1 as described above, it is possible to sufficiently cope with various seam designs and sewing methods.

According to the invention described in claim 2, in the buttonhole sewing machine according to claim 1,

The release timing of each of the upper and lower chambers by the upper thread scissors and the lower thread scissors can be set separately through the input means, and the control means drives the operation means based on the set timing to release the upper thread and the lower thread immediately after sewing starts. It is done.

According to the invention described in claim 2, in addition to the effects of the invention of claim 1, the sewing conditions, for example, the type of cloth or yarn, are released from the release of the upper thread and the lower thread at the timing input to the input means under the control of the control means. According to the length and width of the button hole cutting, the sewing can be formed so that the end of the thread is completely covered in the seam without difficulty.

Here, the specific input value of the timing includes the number of needles, the time, the distance of the cloth transfer, and the like.

According to the invention described in claim 3, in the buttonhole sewing machine according to claim 2,

A detection means (TG generator 123) for detecting the rotational speed of the main shaft, the control means corresponding to the rotational speed of the main shaft detected by the detection means, by appropriately changing and controlling the timing set by the input means and the upper thread and It is characterized by releasing the lower thread.

According to the invention as set forth in claim 3, when sewing, it corresponds to the rotational speed of the main shaft under the control of the control means, and releases the upper thread and the lower thread by appropriately changing and controlling the timing set by the input means. As sewing is released, sewing is completed more.

The ability to freely set the sewing start position and the sewing end position as claimed in claims 1 to 3 also enables the setting of the seam where the seam is to be formed.

Therefore, in the invention described in claim 4, in the buttonhole knitting machine according to any one of claims 1 to 3, the cloth pressing means presses the cloth to press the sewing material so as to surround the buttonhole cutting formed in the sewing object. And a portion 15, 15 ', and is capable of setting the position of the button hole cutting with respect to the cloth pressing portion through the input means.

According to the invention described in claim 4, the sewing position of the fabric pressing can be changed by the size of the fabric pressing portion, the state of the cloth (sewn material), and the like, so that the appropriate sewing state can be adjusted according to the actual situation. For example, it is useful when there is an end of the fabric or a cutting line beside the forming hole of the buttonhole seam so that the fabric can be pressed by pressing the cloth.

In the invention described in claim 5, in the buttonhole thread sewing machine according to claims 1 to 3, the cloth pressing means presses the material to be pressed so as to surround a plurality of sewing points including buttonhole threading formed in the object to be sewing. It is provided with a pressing part 15 ', the number of several places can be set by the input means, and the data regarding each sewing position of several sewing points can be set, and a control means moves without raising a cloth pressing part. It is characterized in that a plurality of sewing points are sewn continuously while the needle and the cloth pressing means are moved relative by means.

According to the invention described in claim 5, a plurality of sewing points can be sewn continuously without raising the cloth pressing portion by using a cloth pressing portion having a size surrounding several sewing points, so that the cycle time is shortened and productivity is improved.

In this case, the "seam position data" may be the sewing position itself, the sewing position itself may be input for the first seam, and the distance to the first seam or the space between adjacent seams may be the second or later. .

In the invention as set forth in claim 5, "multiple sewing points including buttonhole knitting" may be formed in succession of buttonhole knitting in the same manner as the front buttons of a general shirt or blouse. The combination of a buttonhole seam and embroidery.

In addition, in the invention described in claim 6, in the buttonhole knitting machine according to claim 4, heterogeneous pattern buttonhole knitting data including pattern data of several different buttonhole knitting seams can be set through an input means. And different types of button hole cutting based on the heterogeneous pattern button hole cutting data.

According to the invention described in claim 6, since the button hole cutting of different patterns can be continuously formed, it can cope with various designs.

Here, the "hetero-pattern button hole cutting data" may consist only of data of various types of button hole cutting seams, and in addition to the button hole sewing sewing pattern, a sewing pattern separate from button hole cutting, for example, a figure Or embroidery patterns of characters.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described in detail based on following drawings.

<First Embodiment>

The buttonhole tightening sewing machine 1 as an example of this invention consists of the bed part 2, the follower part 3, and the arm part 4. As shown in FIG. The sewing machine 1 is a needle (9) for lifting and lowering the needle oscillation operation, the fabric pressing portion 15 for pressing the fabric (sewn material), the fabric at the lower side and at the same time the fabric feeding direction (Y direction) The upper thread cutting device 70 (FIG. 4) which cuts the upper thread from the upper side of the cloth conveying plate 14, the cloth press part 15 which moves back and forth by this, and the lower thread cutting device 50 which cuts the lower thread under the needle plate 55. (Fig. 8), a cloth cutting blade 16 for cutting the cloth to form a buttonhole, an operation panel 100 (Fig. 10) as an input means for inputting each setting data, etc. and this button hole sewing machine 1 Control circuit 110 (FIG. 9) or the like to control the control circuit.

The cloth pressing portion 15 and the cloth feeding plate 14 constituting the cloth pressing means of the present invention are both driven by the Y-feed drive means 13 while the fabric is sandwiched between them and sent to the front and rear direction (Y direction). It is supposed to. As shown in FIG. 2, the cloth pressing part 15 is fixed to the connecting arm 24 connected to the cloth conveying member 23 while the cloth conveying plate 14 is directly connected to the cloth conveying member 23. The cloth transfer member 23 is fixed to the feed shaft 22 having the rack 22a, and when the Y feed pulse motor 20 rotates, the cloth transfer member 23 is driven through the pinion 20a so that the cloth press 15 and the transfer plate are provided. Move (14) back and forth. That is, the Y feed driving means 13 is constituted by the Y feed pulse motor 20, the feed shaft 22, the cloth feed member 23, and the connecting arm 24.

In addition, the closing plate 25, which will be described later, is fixed to the front end of the connecting arm 24, and the cloth pressing part 15 is fixed to the front thereof again. The cloth pressing portion 15 is connected to the solenoid 127 (FIG. 9) pushed through the pressing rod 27, etc., and when the solenoid 127 is turned on, the cloth is released to the upper side, and the solenoid ( When 127) is OFF, the cloth can be pinched downward. Since the structure of the cloth presser 15 driven by the solenoid is well known, the detail is abbreviate | omitted.

The elevating mechanism for elevating the needle 9 is composed of an upper shaft (spindle) 6, a sewing machine motor 5, a crank cam 7 and the like as shown in Figs. 2 and 3, and cranks the rotational drive of the sewing machine motor 5; The needle 9 is moved up and down by converting it into the lifting motion by the cam 7 and transferring it to the needle bar 8. The upper shaft 6 is linked with the lower shaft 11 through the coupling shaft 10 which arrange | positions the mountain car | truck 10a, 10b in the upper and lower ends, and is interlocked with the book 12 connected to this lower shaft 11.

The needle vibration mechanism for shaking the needle 9 from side to side includes a main needle vibration mechanism for shaking the needle 9 at a predetermined vibration width with a base line as a starting point, an oscillation width changing mechanism for changing the needle vibration width, and the base line in a horizontal direction. It consists of a baseline change mechanism to change.

As shown in FIG. 3, the main needle vibration mechanism includes a needle bar oscillator 18, a needle vibration arm 49, a connecting shaft 48, a connecting lever 47, a needle vibration cam lever 46, a triangular cam 35, and a gear. It consists of (42a) (42b) and the like and transmits the rotational motion of the upper shaft (6) to the triangular cam (35) swings the needle vibration cam lever 46 to a predetermined vibration width and transmits this swing to the needle bar swing table By rotating the 18 around the point 18a, the needle 9 is shaken in the horizontal direction. In the main needle vibrating mechanism, the needle bar 8 is taken on the base line at the timing when the needle 9 falls first, and the needle bar 8 is brought to the position of the predetermined vibration width at the base line at the timing of the second falling. It is supposed to go.

The oscillation width changing mechanism changes the oscillation width of the needle oscillation cam lever 46 through the links 36 and 37 and the coupling link 45 by the rotation of the needle vibration feed pulse motor 41. Change the amplitude of vibration.

The baseline changing mechanism rotates the baseline changing lever 43 about the point 43a by the rotation of the baseline feed pulse motor 40 and changes the position of the point 44a of the baseline lever 44. Point 44a determines the origin of the oscillation motion of the needle vibration cam lever 46. The position of the point 44a is changed. The origin of the oscillation motion of the needle vibration cam lever 46 through the connecting link 45 is determined. And the base position of the needle vibration of the needle 9 is changed.

Moreover, the above-mentioned needle vibration mechanism and the said Y feed drive means 13 comprise the moving means of this invention.

In the vicinity of the needle 9, an upper thread cutting device (upper thread cutting means) 70 and a lower thread cutting device (lower thread cutting means) 50 are disposed.

4 to 7, the upper thread cutting device 70 will be described. The upper thread cutting device 70 is provided with the upper thread scissors 80, and operates the scissors 80 to cut, fix and release the upper thread. 4 and 5, the closing plate 25 is fixed to the tip portion 24a of the connecting arm 24.

The upper thread cutting device 70 includes an upper thread cutting unit 71 for performing the upper thread cutting operation as shown in FIG. 5, and an upper thread cutting driving unit 72 for driving the upper thread cutting unit 71.

The upper thread cutting part 71 includes an upper thread scissors 80 which can be opened and closed freely, a support arm 81 supporting the upper thread scissors 80, and a shaft portion 82 to which the support arm 81 is attached to the distal end. The shaft portion 82 penetrates the bearing 84 which is rotatably connected to the shaft support portions 83 and 83 fixed to the lower portion of the arm portion 4, and is free to slide and rotate with respect to the bearing 84.

The support arm 81 is fixed to the distal end of the shaft portion 82, and the upper thread shear 80 is attached to the distal end portion 81a of the support arm 81 so as to face the fabric pressing portion 15.

The upper thread shear 80 is a fixed blade 85 (FIG. 4) to which the pressing plate 85a is attached, and a movable blade 86 arranged to rotate freely about the pin 86b with respect to the fixed blade 85. The cam contact portion 86a is disposed on the movable blade 86 so as to protrude from the upper surface thereof.

Next, the upper thread cutting drive unit 72 will be described. The upper thread cutting drive 72 is an upper thread shear closing means for performing the operation of closing the upper thread scissors 80 (the operation of cutting the upper thread) with respect to the upper thread cutting unit 71, and the operation of opening the upper thread scissors 80 (the upper thread) Loosening means for upper thread to perform loosening operation).

First, the configuration of the upper thread shear closure means will be described in detail. The driven part 3 is attached so that the base end (right end part) of the operating lever 87 may rotate freely to the axial rotation of the front-back direction. One end of the tension spring 31 is connected to the middle of the operating lever 87, and the other end of the tension spring 31 is hung on the arm 4. The tension spring 31 biases the operating lever 87 in a direction that rotates clockwise (the reverse direction of the arrow d shown in FIG. 5). In addition, the operation lever 87 may be directly operated by the operator, or may be configured such that the operation lever 87 is rotated through the actuator when the actuator is operated by arranging an actuator for driving the operation lever 87.

The roller mounting portion 88 is fixed upward at the proximal end of the operating lever 87, and the roller 89 is disposed at the upper end of the roller mounting portion 88. The swinging body 28 is arrange | positioned so that this roller 89 may contact. The swinging body 28 is provided with an arm 4 so that its proximal end (right end) freely rotates in the axial rotation in the vertical direction. Moreover, the cam 28a is formed in the back surface of the oscillator 28, and the roller 89 contacts the cam 28a. And the front of the swinging body 28 is in contact with the upper portion of the pivoting arm (29). The upper portion of the pivoting arm 29 is fixed to the rear end of the shaft portion 82. The compression spring 30 is sandwiched between the pivoting arm 29 and the bearing portion 84 while passing through the shaft portion 82. The compression spring 30 urges the shaft portion 82 toward the rear side together with the rotation arm 29.

The right side of the cam member 32 is connected to the intermediate portion of the operating lever 87 so as to rotate freely in the axial direction in the front-rear direction. The left end of the cam member 32 is connected to the middle of the lower thread cutting lever 33 so as to rotate freely. The lower thread cutting lever 33 is elongated in the vertical direction, and the lower portion thereof faces the inside of the bed 2. The upper end of the lower thread cutting lever 33 is attached to the driven part 2 so as to rotate freely in the axial direction in the front-rear direction. The crimp body 34 is fixed to the middle portion of the lower thread cutting lever 33. The tip portion 34a of the crimping body 34 extends toward the right side, and the engaging member 73 is disposed near the tip portion 34a.

The dropping member 73 includes a support 73a, a dropping member 73b, and a compression spring 73d (Fig. 7). The support body 73a is formed in the shape of a hook in a cross section, and is screwed to the base 24a of the connecting arm. The locking body 73b is connected to the support body 35a so as to rotate freely. A locking portion 73c that bends upward is formed at the leading end of the locking body 73b. A compression spring 73d is attached between the support 73a and the entrainment 73b, and the compression spring 73d urges the entrainment 73b upward with respect to the support 73a.

Here, the tip portion 34a of the crimping body 34 is close to the upper side of the disengaged body 73b. When the lower thread cutting lever 33 rotates clockwise as viewed from the front, the distal end portion 34a of the crimping body 34 is pressed downward against the crimping spring 73d against the crimp spring 73d.

On the other hand, the roll 74 is disposed in the middle of the rotation arm (29). In addition, one end of the tension spring 75 is hung directly on the roller 74 of the rotation arm 29, and the other end of the tension spring 75 is hung on the upper end of the lower thread cutting lever 33. The rotating arm 29 is biased clockwise as seen from the front of the tension spring 75.

The roller 74 is in contact with the cam portions 32a and 32b formed on the right side of the cam member 32. Thereby, the clockwise rotation of the rotational arm 29 is inhibited. Here, the edge part 32c is formed in the right end of the cam member 32 by the cam part 32a and the cam part 32b. In addition, the engaging hook 29a protruding toward the front is disposed at the lower end of the pivoting arm 29. This locking hook 29a becomes lockable with respect to the locking part 35c of the locking body 73b.

Next, the upper thread release means for freeing the upper thread scissors will be described. The upper thread release means is composed of the upper thread release driving means for opening the upper thread scissors 80, and the upper thread scissors moving means for moving the upper thread scissors 80 from the second standby position to the first standby position after the end of cutting.

The upper thread release driving means is a solenoid 76 which is an operating means of the present invention, a lever 77 attached to the support arm 81 so as to be rotatable in an intermediate portion, and a tension spring for biasing the lever 77 ( 78).

The solenoid 76 is fixed to the lower portion of the arm 4 and is configured to advance back and forth the rod 76a extending forward. The front end of the rod 76a contacts one end of the lever 77. One end of the tension spring 78 is hung on the lever 77, and the other end of the tension spring 78 is hung in the sewing machine frame. The tension spring 78 urges the rod 76a backward with one end of the lever 77. The other end of the lever 77 is formed with an open cam portion 77a extending toward the right side. The open cam portion 77a is disposed on the left side of the cam contact portion 86a. The first cam surface 77b and the second cam surface 77c are formed at the right end of the open cam portion 77a.

Then, the scissors 80 are opened by the upper thread releasing driving means as follows. If the solenoid 76 is turned from the off state to the on state when the upper thread shear 80 is closed, the rod 76a is pushed forward against the tension spring 78. As a result, the lever 77 rotates in the counterclockwise direction (the arrow f direction in FIG. 5). When the second cam surface 77c contacts the cam contact portion 86a as the lever 77 rotates, and the lever 77 rotates again, the first cam surface 77b contacts the cam contact portion 86a. Thereby, the cam contact part 86a is pushed by the open cam part 77a, the movable blade 86 rotates (direction of arrow g of FIG. 4), and the upper thread scissors 80 are opened. When the solenoid 76 is turned off, the tension spring 78 and the rod 76a returns to the original state, but the upper thread shear 80 remains open.

The upper thread shear moving means includes a solenoid 79, a link member 90 connected to the tip of the rod 79a of the solenoid 79, a crimp body 91 connected to the link member 90, and a tension spring ( 75).

The solenoid 79 is fixed to the top of the bed portion 2 (FIG. 7). The rod 79a protrudes from the main body of the solenoid 79 to the right to be retractable. One end of the link member 90 is connected to the distal end of the rod 79a so as to freely rotate up and down. The other end of the link member 90 is connected to the base end of the crimp body 91 so as to rotate freely. The crimping body 91 extends upward and downward from its proximal end, bends toward the right, and is attached to the follower 3 so as to be rotatable in the middle part thereof. And the front-end | tip part 91a of the crimping | compression-bonding body 91 is close to the upper surface of the said recessing body 73b.

The upper thread when the locking hook 29a is positioned below the locking portion 73c of the locking member 73 and the locking hook 29a is locked to the locking portion 73c by the force of the tension spring 75. The scissors moving means moves the scissors 80 after the upper thread release as follows. That is, when the solenoid 79 is turned from the off state to the on state, the rod 79a is dragged to the left (arrow e direction in FIG. 5). Thereby, the crimping body 91 rotates clockwise from the front. As the crimp body 91 rotates, the tip portion 91a of the crimp body 91 pushes down the encapsulating body 73b downward. For this reason, the locking body 73b rotates clockwise, and the locking of the locking part 73c and the locking hook 29a is cancelled | released. When the locking is released, the rotating arm 29 rotates clockwise together with the shaft portion 82 by the force of the tension spring 75. The upper thread scissors 80 attached to the distal end of the support arm 81 by the rotation of the pivoting arm 29 and the shaft 82 move from the second standby position to the first standby position on the left side. At this time, the rotation of the rotational arm 29 is stopped by the roller 74 in contact with the cam member 32.

Next, the configuration of the lower thread cutting device 50 will be described based on FIGS. 5 and 8. The lower thread cutting device 50 includes a needle plate holder 51, a lower thread scissors 52 disposed on the bottom surface of the needle plate holder 51, and a lower thread closing means for closing the lower thread scissors 52 in the open state ( 53) and the lower thread release means 54 for making the lower thread scissors 52 in the closed state open.

The needle plate stand 51 is a plate-shaped member fixed in the bed portion 2, and the needle plate 55 is fixed to an upper surface thereof. An insertion hole for inserting the sewing needle 5 is formed in the needle plate 55, and a drum device is disposed below the needle plate holder 51.

The lower thread scissors 52 are provided with the upper female 56, the lower female 57 and the leaf spring 58. The upper female 56 is disposed under the lower female 57, but the lower female 56 is used as the upper female 56 based on the bottom view of FIG. 8. The lower scalpel 57 is attached to the front of the underside of the needle plate 51 so as to be rotatable in the substantially horizontal plane at its proximal end 57a. The upper scalpel 56 is attached to the lower scalpel 57 to be rotatable. The pin female 56 is arranged to protrude downward from the wemes 56. The front portion of the wemes 56 is formed with a directing portion 56b extending toward the front. And the leaf spring 58 is fixed to the lower scalpel (57).

Next, the structure of the lower thread closing means 53 is demonstrated. The lower thread closing means 53 includes a drive arm 60, a link member 61, a lower thread cutting link 62, a lower thread pulling arm 63 for pulling the lower thread from the bobbin, a link member 64, And a link member 65. At the lower end of the lower thread cutting lever 33, a ball pin 59 extending toward the front is disposed. The rear end of the driving arm 60 extending forward and backward is ball jointed to the ball pin 59. The driving arm 60 is disposed in the bed portion 2 so as to freely rotate in the axial direction in the vertical direction at the intermediate portion thereof.

The front end of the drive arm 60 is connected to the left end of the link member 61 and the other end of the link member 61 is connected to the rear end of the lower thread cutting link 62. The lower thread cutting link 62 is attached to the bottom surface of the needle plate stand 51 so as to rotate freely in the middle portion thereof.

The front end of the lower thread cutting link 62 is attached to the middle of the lower thread pulling arm 63 so as to rotate freely, and one end of the link member 64 is connected to freely rotate with respect to the middle of the lower thread pulling arm 63. The other end of the link member 64 is connected to the lower scalpel 57 so as to rotate freely. One end of the link member 65 is connected to the rear end of the lower thread pulling arm 63 so as to rotate freely. The other end of the link member 65 is connected to the needle plate holder 51 so as to rotate freely.

The lower thread scissors 52 in the state opened by the lower thread closing means 53 are closed as follows. That is, when the driving arm 60 rotates in the state where the lower thread scissors 52 of FIG. 8 are opened (the ends of the lower scalpel 57 and the leaf spring 58 are rearward with respect to the upper scalpel 56), the link member is rotated. Through the 61, the lower thread cutting link 62, the lower thread pulling arm 63, and the link member 64, the lower scalpel 57 rotates forwardly about its proximal end 57a. Accordingly, the upper female 56 moves forward together with the lower female 57, and the directing portion 56b of the female female 56 contacts the edge portion 51b which forms the opening 51a of the needle plate holder 51. do. And the movement of the front memes 56 is inhibited and the lower mes 57 is rotated forward again, so that the front end of the memes 56 and the end of the lower mess 57 coincide to close the bobbin scissors 52. , Cut the bobbin thread from the bobbin. In addition, the lower thread scissors 52 fix the lower thread by the leaf spring 58 and the weft 56 when it is closed.

The lower thread release means 54 opens the bobbin shear 52 by pressing the pin 56a. The lower thread release means 54 includes a solenoid 66, a link member 67, an operation arm 68, and a tension spring 69, which are operating means of the present invention. The solenoid 66 is fixed to the bed part 2 and advances the rod 66a which is the output shaft in the front-back direction. The rear end of the link member 67 is connected to the front end of the rod 66a so as to be rotatable in a substantially horizontal plane. An operating arm 68 is connected to the front end of the link member 67 so as to rotate freely. In addition, one end of the tension spring 60 is connected to one end of the working arm (68). Moreover, the operation arm 68 is connected to the needle plate holder 51 so as to rotate freely at the other end, and the drawing pin 68a is formed so as to be able to contact the pin 56a from the other end. The other end of the tension spring 69 is fixed relative to the bed portion 2 and biases clockwise with the working arm 68 from below (in FIG. 8).

And by the lower thread release means 54, the scissors 52 release the lower thread as follows. When the solenoid 66 is turned from the off state to the on state, the rod 66a is pushed out. Accordingly, the working arm 68 rotates counterclockwise against the tension spring 69, and the directing pin 68a of the working arm 68 presses the pin 56a. When the pin 56a is pressed in the non-contact state (ie, the upper female 56 can move forward) between the directing portion 56b and the edge portion 51b, the upper female 56 moves forward with respect to the lower female 57. Rotate Thereby, the lower thread scissors 52 unwind and loosen the lower thread which was being fixed at the same time. When the solenoid 66 is turned off from the on state, the operating arm 68 rotates clockwise by the force of the tension spring 69.

The operation of the upper thread cutting device 70 and the lower thread cutting device 50 having the above configuration will be described. The upper thread cutting device 70 and the lower thread cutting device 50 during sewing of the sewing machine are the initial state shown by the solid line of FIG. In other words,

1. The operating lever 87 is in the position A by the force of the tension spring 31.

2. The shaft 82 and the rotational arm 29 are located at the rear by the force of the compression spring 30.

3. As shown in FIG. 7, clockwise rotation of the rotational arm 29 by the tension spring 75 is inhibited by the roller 74 coming into contact with the cam portion 32b of the cam member 32. As shown in FIG.

4. The solenoid 79 is in an off state and the crimp body 91 does not crimp down the entrainment body 73b downward. The crimping body 34 also does not crimp the breakaway body 73b downward.

5. The latch hook 29a is located on the upper surface side of the plunger 73b.

6. The solenoid 76 is Off, and the upper thread shear 80 is open, and is located in the first standby position (the position after beveling leftward from the upper and lower trajectories of the needle 9 when viewed from above).

7. The solenoid 66 is Off and the bobbin shear 52 is opened.

8. The leading portion 56b of the weiss 56 does not contact the edge portion 51b of the needle plate holder 51, and the lower thread scissors 52 are in the initial position.

When the operator operates the operation lever 87 after the button hole cutting is finished, the operation lever 87 rotates counterclockwise (the arrow d direction in FIG. 5) about its proximal end, and reaches the position B in FIG. 7. Rotate During this movement, the upper thread cutting device 70 operates as follows. That is, when the roller 89 moves along the cam 28a of the swinging body 28 by rotating the operating lever 87 counterclockwise, the swinging body 28 rotates forward. Accordingly, the swinging body 28 pushes the shaft 82 forward with the pivoting arm 29. The upper thread scissors 80 move forward by the movement of the shaft part 82 forward.

On the other hand, by rotating the operating lever 87, the cam member 32 rotates clockwise in FIG. 7 around its left end. By the rotation of the cam member 32, the lower thread cutting lever 33 rotates clockwise around its upper end, while the cam portion 32b pushes the roller 74 to the right.

As the lower thread cutting lever 33 rotates, the crimping body 34 presses the splinter 73b downward. Meanwhile, as the roller 74 is pushed to the right, the shaft portion 82 together with the rotational arm 29 rotates counterclockwise in FIG. 7. Here, the crimping body 34 presses the locking device 73b downward so that the locking device 73b does not interfere with the movement of the locking hook 29a. The shaft portion 82 rotates counterclockwise until the roller 74 contacts the edge portion 32c of the cam member 32. The upper thread scissors 80 move to the cutting position on the right side by the counterclockwise rotation of the shaft portion 82.

When the upper thread shear 80 starts to move from the first standby position toward the cutting position, the cam contact portion 86a of the movable blade 86 contacts the closing plate 25, and the cam contact portion 86a is closed plate ( 25) is relatively pushed back. Accordingly, the movable blade 86 rotates counterclockwise as seen from above with respect to the fixed blade 85. The upper thread scissors 80 are closed by the rotation of the movable blade 86 to cut the upper thread and at the same time fix the upper thread connected to the needle 9.

In addition, when the operation lever 87 is operated from the position of B to the position of C, the upper thread cutting device 70 operates as follows. In other words, the roller 89 is over the mountain of the cam 28a of the swinging body 28 so that the swinging body 28 is not pushed forward. Accordingly, the shaft 82 and the rotational arm 29 are returned to the rear by the force of the compression spring 30 and the upper thread shear 80 moves toward the rear in a closed state.

On the other hand, by the rotation of the operating lever 87, the cam member 32 rotates clockwise around its left end. As the cam member 32 rotates, the lower thread cutting lever 33 rotates clockwise again, and the roller 74 which contacts the edge portion 32c comes into contact with the cam portion 32a. When the roller 74 contacts the cam portion 32a, the shaft portion 82 together with the rotational arm 29 rotates clockwise slightly from the front side by the force of the tension spring 75. By the clockwise rotation of the shaft portion 82, the upper thread shear 80 moves slightly to the left in the closed state.

Here, while the operating lever 87 moves from the position of A to the position of C, the lower thread cutting device 50 operates as follows.

As described above, the lower thread cutting lever 33 rotates clockwise about its upper end by the rotation of the operating lever 87. By the rotation of the lower thread cutting lever 33 in the clockwise direction, the driving arm 60 rotates clockwise about its middle part in FIG. 8. By the clockwise rotation of the drive arm 60, the lower thread cutting link 62 rotates counterclockwise about the middle portion thereof through the link member 61. By the counterclockwise rotation of the lower thread cutting link 62, the lower thread pulling arm 63 rotates counterclockwise about its middle portion. The lower thread pulling arm 63 pulls the lower thread derived from the bobbin by rotation in the counterclockwise direction. On the other hand, by the counterclockwise rotation of the lower thread cutting link 62, the lower scalpel 57 rotates clockwise around its proximal end. When the lower blade 57 rotates, the leading portion 56b of the upper blade 56 contacts the edge portion 51b of the needle plate holder 51, and the rotation of the upper blade 56 stops while the lower blade 57 Continues to rotate. Accordingly, the lower thread scissors 52 cut the lower thread drawn by the lower thread pulling arm 63. And the lower bobbin scissors 52 fix the bobbin thread following the bobbin after cutting.

Then, when the worker releases the operating lever 87, the operating lever 87 returns to the position A by the force of the tension spring 31. At this time, the upper thread cutting device 70 operates as follows.

The roller 89 is returned to the initial position by the rotation of the operating lever 87. As a result, the swinging body 28 rotates forward, then rotates backward, and returns to the initial state. In accordance with the rotation of the swinging body 28, the shaft portion 82 and the pivoting arm 29 also move forward, then move backward, and return to the initial state. Therefore, the positional relationship before and after the upper thread scissors 80 becomes the same as the 1st waiting position.

On the other hand, by returning the operating lever 87, the cam member 32 is rotated counterclockwise (FIG. 7) about the left end part. As the cam member 32 rotates, the lower thread cutting lever 33 rotates counterclockwise about its proximal end. In response to the counterclockwise rotation of the lower thread cutting lever 33, the pressing body 34 releases the pressing on the latching body 73b, and the latching body 73b returns to the initial state. On the other hand, as the cam member 32 is rotated counterclockwise, the roller 74 moves from the cam portion 32a to the edge portion 32c and the cam portion 32b, and the rotating arm 29 moves in the tension spring 75. Rotate clockwise by the negative force of. Accordingly, the upper thread scissors 80 are moved to the left through the shaft portion 82. Here, when the roller 74 moves to the cam portion 32b, the latching body 73b returns to the initial state, so that the locking hook 29a of the pivoting arm 29 is connected to the locking portion 35c of the latching body 73b. Is locked. As a result, the rotation of the rotational arm 29 in the clockwise direction is inhibited, and the contact between the roller 74 and the cam portion 32b is released. Therefore, the movement to the left of the upper thread scissors (80) also stops.

As described above, when the operating lever 87 returns from the position C to the position A, the positional relationship before and after the upper thread shear 80 is returned to the first standby position, but the positional relationship between the left and right is not returned. This position is the second standby position after the end of cutting described above. The upper thread scissors 80 in the second waiting position are closed and the upper thread is fixed.

Here, until the operating lever 87 rotates from the position of C to the position of A, the lower thread cutting device 50 operates as follows.

As described above, the lower thread cutting lever 33 rotates counterclockwise around the upper end thereof by the rotation of the operating lever 87. By the counterclockwise rotation of the lower thread cutting lever 33, the driving arm 60 rotates counterclockwise about its middle part as viewed from the bottom. By the counterclockwise rotation of the drive arm 60, the lower thread cutting link 62 rotates clockwise about the middle portion thereof through the link member 61. By the clockwise rotation of the lower thread cutting link 62, the lower thread pulling arm 63 rotates clockwise about its middle portion and returns to the initial state. On the other hand, by the clockwise rotation of the lower thread cutting link 62, the lower scalpel 57 rotates counterclockwise around its proximal end together with the upper scalpel 56, and the directing portion 56b and the needle of the female scalpel 56 The contact with the edge part 51b of the board stand 51 is released. Accordingly, the lower thread scissors 52 return to the initial position in the closed state.

Then, the start switch 125 is operated by the operator so that the sewing machine starts sewing the next cycle. After starting sewing of the sewing machine, the upper thread cutting device 70 and the lower thread cutting device 50 operate as follows.

In the upper thread cutting device 70, the solenoid 76 turns from the off state to the on state, and the lever 77 rotates counterclockwise (f direction in FIG. 5). As the lever 77 rotates, the second cam surface 77c contacts the cam contact portion 86a, and the cam contact portion 86a eventually contacts the first cam surface 77b. Therefore, the open cam portion 77a (the second cam surface 77c and the first cam surface 77b) pushes the cam contact portion 86a, and the movable blade 86 rotates clockwise (g direction) as shown in FIG. Accordingly, the upper thread scissors 80 are opened and the upper thread scissors 80 loosen the upper thread that was being fixed. After the upper thread shear 80 is opened, the solenoid 76 is turned off, so that the rod 76a and the lever 77 return to the original state, but the upper thread shear 80 remains unchanged.

After that, the solenoid 79 is turned from the off state to the on state, and the rod 79a is pulled to the left (e direction in FIG. 5). Thereby, the crimping | compression-bonding body 91 rotates, crimping | compressing the decay body 73b downward, and the engagement of the engaging hook 29a and the decay body 73b is cancelled | released. Accordingly, the pivot arm 29 rotates clockwise by the force of the tension spring 75 until the roller 74 contacts the cam portion 32b of the cam member 32. With the rotation of the rotational arm 29, the shaft portion 82 rotates and the upper thread shear 80 moves to the left, and eventually returns to the first standby position. After the upper thread scissors 80 return to the first standby position, the solenoid 79 is turned off and the crimping downward by the crimp 91 is released.

When sewing starts, the solenoid 66 is turned on from the off state in the lower thread cutting device 50, and the rod 66a is pushed forward. Accordingly, the working arm 68 rotates in the counterclockwise direction of FIG. 8 and the directing pin 68a of the working arm 68 presses the pin 56a. Accordingly, the upper scalpel 56 rotates clockwise with respect to the lower scalpel 57 and unwinds the lower thread at the same time as the lower bobbin shear 52 opens. After the lower thread scissors 52 are opened, the solenoid 66 is turned off and the operating arm 68 is rotated clockwise by the spring 69 to return the operating arm 68 to the initial state.

9 shows a schematic block diagram of the control circuit 110 of the buttonhole sewing machine 1.

The control circuit 110 is a Y-feed pulse for driving the central processing unit (CPU) 111, the read only memory (ROM) 112, the random access memory (RAM) 113, and each pulse motor as shown in FIG. 9. Upper thread shear driver 117, lower thread which drives the motor driver 114, the baseline feed pulse motor driver 115 and the needle vibration feed pulse motor driver 116, the upper thread shear actuating means (here solenoid 76, 69). A push-up solenoid for driving control of a lower thread shear driver 118 for driving scissors operating means (here solenoid 66), a sewing machine motor driver 119 for driving control of the sewing machine motor 5, and a pushing solenoid 127. And a cylinder driver 120 for driving the cloth cutting blade lowering cylinder 19 for lowering the cloth cutting blade 16.

The sewing machine motor driver 119 detects that, in addition to the sewing machine motor 5, an encoder 121 and a needle 9 for encoding the rotational amount of the sewing machine motor 5 as the rotation angle of the upper shaft 6 are in an upper position. The position sensor 122 on the needle and the TG (dako generator) generator 123 for detecting the rotational speed of the upper shaft 6 are connected to the detection means in the present invention.

In addition, the CPU 111 includes a push switch 124 for instructing the operation of the operation panel 100 and the cloth presser 15 to be described later, a start switch 125 for instructing driving start of the sewing machine motor 5, and the like. Is connected.

The CPU 111 according to the control program stored in the ROM 112 as a predetermined area of the RAM 102, each driver based on the data from the operation panel 100 or the detection signals from the various sensors connected thereto. Control means for controlling each drive unit through.

The ROM 112 has control data for sewing the buttonholes on the basis of input processing from the operation panel 100 or various sewing data input through the operation panel 100 (all needle drops from the start of sewing to the end of sewing). A control program including arithmetic processing for calculating a position, etc.), and a sewing processing for performing a sewing operation based on the calculated control data.

The ROM 112 has a range of data values that can be set corresponding to each of the data items shown in FIG. 11, unit values of data that can be increased or decreased by one operation of the minus key 103b and the plus key 103c described later, Standard data values and the like are stored.

In addition, in the ROM 112, a plurality of patterns set for all data values (No. 1 to No. 23) in Fig. 11 are stored to perform button hole cutting of a predetermined shape pattern.

The RAM 113 serves as a working area of the CPU 111 and at the same time serves as a storage means of the present invention for storing various data of the button hole seaming seams input through the operation panel 100.

FIG. 10 shows the operation panel (input means) 100 provided in the button hole sewing machine 1.

The operation panel 100 performs setting input of various sewing parameters, display output of a set value, or display output of an error in sewing control. For example, the operating panel 100 is disposed on a sewing machine table on which a buttonhole cutting machine 1 is placed. do.

In the operation panel 100, a start operation unit 101, a number operation unit 102, a data value input operation unit 103, and a mode conversion operation unit 104 are disposed.

The start operation unit 101 is provided with a preparation key 101a for inputting a meaning that the operator is ready for sewing or resetting, and a display unit 101b including an LED (Light Emitting Diode) indicating the state.

The number display section 102a, the down key 102b, and the up key 102c are arranged in the number operation section 102. The number display section 102a includes two lines of seven segment display sections, and displays the number and pattern number of data items for inputting data values.

The down key 102b and the up key 102c are keys for hiding the data item number or the pattern number one by one. The down key 102b is one key for delaying, and the up key 102c is one key for advancing. The contents of the data items will be described later in detail.

In the data value input operation section 103, a data value display section 103a, a minus key 103b, and a plus key 103c are arranged. The data value display section 103a is constituted by four segment seven-segment display sections and displays data values of each data item. The minus key 103b and the plus key 103c are keys for increasing or decreasing the data value by a predetermined unit value. As described later, a predetermined unit value and a settable range are determined for each data item. When the minus key 103b is pressed, the data value is decreased by unit value, and when the plus key 103c is pressed, the data value is increased by unit value.

The mode number operation unit 104 is arranged with a pattern number key 104a for converting to a pattern number setting mode and a data key 104b for converting to a data input mode. Indicators 104c and 104d such as LEDs are disposed on the pattern number key 104a and the data key 104b, respectively, so that the operator can inform the operator of the pattern number setting mode and the data input mode by lighting them.

The operator first operates the pattern number key 104a to select the desired pattern number. 1,2,3,4,... Then, each data item is selected by operating the data key 104b, and the data value is set and changed in the data value input operation unit 103. By selecting a pattern number, the data value is previously determined for each pattern. Is set so that if the data value is good, there is no need to change it.

Here, the types and contents of the sewing data which can be input from the operation panel 100 and determine the shape and size of the button hole seam seams will be described.

Fig. 11 shows a data table showing data items that can be input from the operation panel, and Fig. 12 shows a diagram illustrating which part of the button hole cutting length each data item of Fig. 11 represents. In FIG. 12, each data item name and data number are described in each part of the buttonhole seam u0.

Data items that can be input from the operation panel 100 with respect to the buttonhole seam u0 are as shown in the data table of FIG.

In other words, data numbers 1 to 16 are cloth cutting length data (the length of the button hole groove u1), length of the button hole, the width of the female groove right side (the distance between the button hole groove u1 and the left end of the right sewing part u2), and the left side of the measuring groove. Width data (distance between buttonhole groove u1 and right end of left sewing part u2), knitting width data (length of left and right width of side sewing part u2), bolt fixing length data (vertical length of latch fixing u3), gap length data In-gap data (distance between the bottom of the weave fixing part u3 and the top of the button hole groove u1) and second gap data (the distance between the upper part of the lower bent fixing part u3 and the lower part of the button hole groove u1), parallel pitch Data (the longitudinal distance between the two needles of the side sewing part u2), the latch fixing pitch data (the longitudinal distance between the two needles of the latching fixing u3), and the right correction data of the fixing fixing width (the right end of the fixing fixing u5 and Offset length with right end of right sewing part u2), left side fixing data The shift length between the left end of the top fixing part u3 and the left end of the left sewing part u2), the left parallel part tension data (the actual tension when sewing the left sewing part u2), and the right parallel part tension data (the sewing part of the right sewing part u2 Thread tension), the first comb fixing part tension data (thread tension when sewing the webbing fixing part u3), the second comb fixing part tension data (the thread tension when sewing the lower part fixing part u3), and the fastest speed limit data. (The maximum limit of the number of revolutions of the sewing machine).

Data numbers 17 to 23 in Fig. 11 are characteristic data items in the present invention. In the conventional sewing machine, when the knitting shown in FIG. 12 starts sewing from the point A of the left sewing portion as shown in FIG. 13 (a), sewing should be finished at the same point A as shown in FIG. 13 (b). However, in the present invention, the solenoids 76, 79, 66 are arranged so that the operation of the upper thread cutting device 70 and the lower thread cutting device 50 after thread cutting are independent from other mechanisms such as cloth feeding and pressing. It is not necessary to match the sewing end position to the sewing start position as in the prior art. Therefore, sewing start position and sewing end position can be set separately.

That is, in the sewing machine 1, the data No. 19 "Sewing start position" and No. 20 "Sewing end position" can be set. For example, point A can be set as the "sewing start position" and point B in FIG. 13 (c) can be set as the "sewing end position". These data can be set at intervals of 0.1 mm in the range of "0.00 to 5.00" mm with the origin position in the Y 'direction (the reverse direction to the cloth transfer direction), which is the direction in which the seam is formed. Here, the sewing start position and the sewing end position are both inside the left sewing part on the base line.

In addition, since the operation of raising the thread cutting and pressing the cloth is linked in the related art, the cloth pressing part has to be raised every time one knitting is finished. In addition, since cloth transfer and thread release were involved, the cloth transfer means (Y feed drive means) had to be mechanically homed at the start of sewing.

However, in the present invention, since there is no such relationship, several seams can be continuously formed at one time (continuous sewing), and the sewing position can be freely set for the cloth press.

For example, if you use a very long cloth presser that can cover an area that spans two adjacent buttonholes, you can cut the buttonhole at the next threading position without removing the cloth presser after one buttonhole break. Can be.

That is, in the sewing machine 1, the data No. 17 "Number of sewing", No. 18 "Sewing interval" and No. 23 "sewing position" can be set. "Number of sewing" can be set in the range of "1-5" pieces. For example, as long as the cloth pressing portion 15 'long enough in the Y direction is used as shown in FIG. 14, when two button hole cutouts B1 and B2 are formed as shown in FIG. Set it. As shown in Fig. 14B, in the case of forming one hole hole cutting B3, it is set to &quot; 1 &quot;.

"Sewing interval" is to set the distance (W) between the origin of the seams adjacent to each other in the case of forming a plurality of buttonhole cutting as shown in Fig. 14 (a), 1mm interval in the range of "0 ~ 100" mm Can be set.

Data No. 23 "sewing position" is the origin position of the seam (the position which becomes the origin of the "sewing start position" above) the seam first formed on the basis of the mechanical origin position of the Y-feed drive means 13, that is, Fig. 14 (a ), &Quot; 01 &quot; and &quot; 02 &quot; in Fig. 14B. This value can be set in 1 mm intervals in the range of "0 to 100" mm. By this setting, it is set at which position in the frame of the cloth pressing part 15 '.

The sewing position in the cloth press can be freely set according to the data No. 23 "sewing position", which is advantageous when sewing near the end of the cloth. In the related art, when the long fabric pressing portion 15 'is temporarily used, the seam formation position and the position of the fabric feed are fixed, so that the button hole is cut near the end S1 of the fabric S as shown in FIG. In the case of forming B4), the fabric pressing portion 15 'was lifted, and in this case, the fabric pressing portion 15' had to be replaced with a shorter one.

However, if the sewing position in the frame of the cloth pressing portion 15 'can be freely set as in the present invention, the sewing position is set for the cloth pressing portion 15' by avoiding the end S1 as shown in Fig. 15 (b). It is not necessary to replace the cloth presser 15 '.

In addition, in the upper thread cutting device 70 and the lower thread cutting device 50, independent operation means such as the solenoid 76 and the solenoid 66 are used for the release of the upper thread and the lower thread, so that the upper thread and the lower thread at the start of sewing The timing can be set freely. Thereafter, data No. 21 "Upper thread release timing" and No. 22 The lower thread release timing is set within the range of needle count from 1 to 20 at the start of sewing.

In the ROM 112, a table t1 shown in FIG. 16 is stored. In this table t1, the number of correction needles of the release timing for each of the upper thread and the lower thread according to the rotational speed of the upper shaft is set. For example, if the rotation speed is "400", the correction needle number is "0" for both the upper thread and the lower thread, and in this case, the timing set by data No.21 "upper thread release timing" and No.22 "lower thread release timing" The thread is free. If the rotation speed is "3000", the thread can be released sooner by subtracting from the value set in "3" needle powder for the upper thread, "2" needle powder for the lower thread, and data Nos. 21 and No. 22. That is, the table t1 is for adjusting the thread to be released at an early timing when the sewing speed is fast.

No. "60", "61" of the pattern numbers of FIG. 11 are the patterns of "heterogeneous pattern continuous sewing" which sew another pattern continuously. For example, when the pattern "60" is selected by the operation panel 100, the contents of each process and its sewing position are set as shown in the table t2 of FIG. 17 as an example of the heterogeneous pattern button hole cutting data instead of the data item. One seam pattern number is set for each process, and the process is sewn with sewing data according to the selected pattern number. The "sewing position" is the distance from the origin position of the cloth feed in the same manner as the data No. 23 "sewing position" for the step 1, and the distance from the previous step in the other steps.

In FIG. 17, for example, "1" in the process 1, "2" in the process 2, and this process is repeated until the process 5, and it is set to "30" about the process 1 about the sewing position, and to "70" other than that. Set. In this way, the knitting based on the pattern No. 1 and the pattern No. 2 is repeated alternately, and the distance between each brush period is 70 mm.

18-21, the flowchart of each process performed under the control of the CPU 111 in the buttonhole thread sewing machine 1 which has the said structure was shown.

18 shows a general flow of button hole cutting.

The flow of FIG. 18 starts, for example, when the power supply of the sewing machine 1 is turned ON. First, in step S1, the setting process of the operation panel 100 is performed by an operator. In step S2, it is determined whether the preparation key 101a has been operated, and if it is operated, the process shifts to step S3, and if not, the process returns to step S1.

In step S3, a process of calculating the needle drop position is performed based on the data set via the operation panel 100, and then it is determined whether the ready key 101a is pressed in step S4. If the ready key 101a has not been pressed here, the flow returns to step S1 again to enable resetting. If the ready key 101a has not been pressed in step S4, the flow proceeds to step S5, where the sewing material is set by the operator. Next, in step S6, it is determined whether the start switch 125 is turned on. When the start switch 125 is turned ON by the operator's operation, the flow advances to step S7 where sewing processing including cutting, opening of a button hole, thread cutting, and the like is performed. If it is determined in step S6 that the start switch 125 is not ON, the process returns to step S4.

19 shows the flow of the sewing process of step S7. First, in step J1, it counts as "M = 1" as the first in the data No. 17 "sewing number" of FIG. Subsequently, the cloth is sent in the Y direction by the Y feed pulse motor 20 to the "sewing position" set in the data No. 23 in step J2. In addition, the cloth is sent in the Y direction to the "sewing start position" set in the data No. 19 in step J3.

The process proceeds to step J14 where the sewing machine motor 5 and the like are driven and the needle 9 is dropped to the needle drop position obtained in the step S3 to form a knitting seam and the cloth cutting blade 16 is driven by predetermined driving. A button hole having a length (Fig. 11, data No. 1) is formed, and the upper thread cutting device 70 and the lower thread cutting device 50 are driven as described above to perform a thread cutting process.

Subsequently, in step J5, it is determined whether the M value of the step J1 is "the number of sewing" of data No.17. If it is the number of sewing, the process proceeds to step J8 by driving the solenoid 127 to be pushed up and raising the cloth presser 15 to finish this processing.

On the other hand, when it determines with M not having reached the sewing number in step J5, it counts as "M = M + 1" in step J6. Subsequently, the fabric is sent by the "sewing interval" set in the data No. 18 in step J7, the fabric is sent in the Y direction to the "sewing start position" in step J9, and the process returns to step J4 to perform the next sewing.

The flow of the release | release process of the upper thread and the lower thread at the time of sewing start was shown in FIG. This process is started by first inputting an intervention signal from the position sensor 122 on the needle, which means that the needle is located at the top dead center in step J10. Next, in step J11, "1" is added to the needle count.

Next, in step J12, the current rotation speed is obtained from the TG generator 123. Subsequently, in step J13, the number of needles (needle number correction) obtained in the table t1 of FIG. 16 is subtracted from the number of needles of "upper thread release timing" set in data No. 21 of FIG. Find the number of needles at the timing to release the upper thread.

In step J14, the number of needles (needle number correction) obtained from the table t1 of FIG. 16 by the number of revolutions obtained in step J12 from the number of needles of the "lower thread release timing" set in data No. 22 of FIG. 11 as in step J13. To get the needle out of the timing to release the bobbin thread.

Subsequently, in step J15, it is determined whether the number of needles currently sewn is equal to or greater than the number of needles determined in step J13, and when it is determined that the number of needles is greater than or equal to the number of needles, the process proceeds to step J16 where the upper thread cutting device 70 (solenoid 76) is driven and The lock is released and the flow proceeds to Step J17.

If it is determined in step J15 that the number of needles obtained in step J13 has not been reached, the process proceeds directly to step J17. In step J17, it is determined whether the number of needles currently sewn is equal to or greater than the number of needles determined in step J14. Release to finish this process. If it is determined in step J17 that the number of needles determined in step J14 has not been reached, the process is completed as it is.

FIG. 21 shows the flow of the hetero pattern continuous sewing process set as shown in the table t2 of FIG. This process starts when the start switch 125 is operated, and first, in step J20, the number of steps is counted as "N = 1". Subsequently, in step J21, the cloth is sent in the Y direction to the sewing position of the first step, and the fabric is sent in the Y direction to the "sewing start position" in step J22.

Subsequently, the procedure proceeds to step J23, where the first pattern sewing is performed, and in step J24, 1 is added to N, the counter counts as a new N, and the procedure proceeds to step J25. In step J25, it is determined whether or not the "N" step counted in step J24 is set in the table t2. If it is set, the process returns to step J21 and sewing is performed in accordance with the pattern of the Nth step. If it is determined in step J25 that the "N" th process is not set, this process is completed.

According to the above-mentioned button hole sewing machine 1, the release of the upper thread by the upper thread shear 80 is performed by the solenoid 76, and the release of the lower thread by the lower thread shear 52 is performed by the solenoid 66. did. That is, the release of the upper thread and the lower thread uses an independent drive source without interlocking with other mechanisms such as a cloth feed mechanism as in the prior art. Therefore, the limitation by the cloth feed apparatus is eliminated.

Therefore, the sewing start position (data No. 19 in FIG. 11) and the sewing end position (data No. 20) are set through the operation panel 100, and the sewing start position and the sewing end position are controlled under the control of the CPU 111. FIG. You can form a seam to be in another position.

Therefore, the needless sewing drop as in the prior art is eliminated, the appearance is improved as much as it is possible to improve the quality of the product and shorten the cycle time.

In this way, the solenoids 76 and 66 of the thread release are separated from the cloth transfer mechanism, so that the sun knife that forms the buttonhole while sending the cloth before sewing is possible.

According to the sewing machine (1) as described above it is possible to fully cope with the design and sewing methods of various seams.

In addition, the upper thread and the lower thread are configured to release the thread by different operating means, so that the upper thread release timing (data No. 21) and the lower thread release timing (data No. 22) are set for each of the upper thread and the lower thread through the operation panel 100. The sewing can be released at an appropriate timing so that the yarn is completely covered in the seam according to the sewing conditions, e.g., the type of cloth or thread, the length or width of the buttonhole, and the sewing finish is improved. do.

In addition, since the thread is released at a timing as fast as the rotational speed at the time of sewing start based on the table t1 shown in FIG. 16, the actual sewing situation is also taken into consideration, and sewing finishing is further improved.

The data No. 23 By setting the "sewing position", the seam forming position with respect to the cloth presses 15 and 15 'can be set. In the conventional case, even when the cloth press part needs to be replaced, an appropriate sewing state can be adjusted only by changing the sewing position, thereby improving workability.

In addition, continuous sewing is possible, and by setting the value of "2" or more in data No. 17 through the operation panel 100, a large number of cloth pressing portions such as the cloth pressing portion 15 'is used without raising the cloth pressing portions. Since the button hole cutting can be formed continuously, cycle time is shortened and productivity improves.

In particular, according to the heterogeneous pattern continuous sewing set on the table t2 (FIG. 17), it is possible to cope with various designs from being able to continuously form buttonholes of different patterns.

In addition, in the first embodiment, after operating the operating lever 87 after sewing, the upper thread and the lower thread are cut by transmitting the mechanical operation, and then the solenoid 79, the upper thread and the upper thread scissors 80 are moved. Although the solenoids 76 and 66 are used as the operation means for the release of the lower thread, the present invention is not limited thereto.

In other words, the solenoid may be the driving source for all operations in the upper thread cutting device and the lower thread cutting device, that is, the thread cutting, the movement after the thread cutting, and the thread release may be performed, and at this time, a configuration in which two or more operations are performed with one solenoid may be adopted. .

In the case of heterogeneous pattern continuous sewing, a sewing pattern different from the buttonhole knitting, for example, a sewing pattern such as embroidery may be included so as to continuously sew.

<2nd embodiment>

22 to 25 show a second embodiment of the present invention. The sewing machine of this second embodiment has a main configuration substantially the same as that of the sewing machine 1 of the first embodiment, and only the upper thread cutting device and the lower thread cutting device will be described below.

The operating means of the upper thread cutting device and the lower thread cutting device according to the present invention are not limited to the solenoid but may be electrically controlled. For example, the following upper thread cutting device 200 and the lower thread cutting device 230 Likewise, a pulse motor may be used. In FIGS. 22-25, the same code | symbol is attached | subjected about the same member as the said embodiment.

As shown in FIGS. 22 and 23, the upper thread cutting device 200 opens and closes the upper thread scissors 80 using the upper thread scissors 80 and the pulse motor 201 as a driving source, and simultaneously moves the upper thread scissors 80. The drive mechanism 202 is provided.

The upper thread shear driving mechanism 202 includes a pulse motor 201, a lever 77, a cam mechanism 204, a thread cutting base 205, a cam member 207, 210, and a latch cam 208. 211 and tension springs 209 and 212 are provided.

The base 203 is arrange | positioned at the arm part 4, and the upper thread shear drive mechanism 202 is attached to the base 203. As shown in FIG. The drive shaft 201a of the pulse motor 201 protrudes to the right from the base 203 and is free to rotate about the base 203.

At the lower rear end of the base 203, the rotary base 206 is disposed so as to rotate freely. The rear end portion of the upper thread cutting base 205 disposed to be substantially parallel to the base 203 is connected to the rotary base 206 so as to freely move back and forth with respect to the rotary base 206.

The cam member 207 is fixed to the left side of the base 203. At the front end of the cam member 207, a cam surface 207a is formed.

In addition, one end of the latch cam 208 formed in the shape of a hook is rotatably connected to the left side of the base 203. One end of the tension spring 209 is connected to the latch cam 208, and the other end of the tension spring 209 is connected to the base 203. The tension spring 209 biases the latch cam 208 in the counterclockwise direction as seen from the right side (in Fig. 23). A cam surface 208a is formed at the lower end of the latch cam 208.

Meanwhile, the cam member 210 having the cam surface 210a formed on the right side of the upper thread cutting base 205 is fixed. As the upper thread cutting base 205 moves forward and backward, the cam surface 210a is folded with respect to the cam surface 207a.

The latch cam 211 is fixed to the left side of the upper thread cutting base 205 so that the cam surface 211a formed at the upper end thereof protrudes upward from the upper thread cutting base 205.

When the cam cam 211a and the cam cam 208a of the latch cam 208 are in contact with each other and the latch cam 211 moves to the left side, the latch cam 208 is rearwardly facing the bias force of the tension spring 209. Rotate upwards around the wealth. Eventually, the contact between the cam surface 208a and the cam surface 211a is released, and the left surface of the latch cam 208 comes into contact with the right surface of the latch cam 211.

However, the tension spring 212 which biases the upper thread cutting base 205 to the right side is connected to the middle portion of the upper thread cutting base 205. By the tension spring 212, the upper thread cutting base 205 is urged in the direction of rotation to the right about the rotary base 206. However, when the right side of the latch cam 211 and the left side of the latch cam 208 is in contact with the right side of the upper thread cutting base 205 is inhibited.

The same lever 77 as in the first embodiment is attached to the right side of the upper thread cutting base 205 so as to rotate freely in the middle portion thereof. The lever 77 is urged backwards by the tension spring 78.

The upper thread scissors 80 are disposed at the front end of the upper thread cutting base 205. In addition, a closing plate 25 is disposed at the front end of the upper thread cutting base 205.

The cam mechanism 204 is connected to the drive shaft 201a of the pulse motor 201. The cam mechanism 204 is composed of a drive cam 213 attached to the drive shaft 201a, a front and rear cam arm 214 attached to the drive cam 213, a scissors cam arm 215, and the like.

The drive cam 213 is a substantially disk-shaped member disposed on the right side of the base 203, and a central portion thereof is fixed to the drive shaft 201a to rotate together with the drive shaft 201a. The first cam hole 213b and the second cam hole 213c are formed in the drive cam 213. The detection part 213a is formed in the drive cam 213 so that it may come out, and the sensor 218 detects the edge 213d of this detection part 213a. The sensor 218 detects that the rotation angle of the drive cam 213 is in an initial state by detecting the edge 213d.

The front and rear cam arms 214 are connected to the base 203 at their intermediate portions so as to rotate freely. The upper and lower cam arms 214 are disposed with a cam floor 214a for freely sliding into the second cam hole 213c, and a pin 216 is disposed at a lower portion thereof. The pin 216 is coupled to freely slide into the elongated through hole 205a formed in the upper thread cutting base 205. The scissors cam arm 215 is connected to the base 203 at its intermediate portion so as to rotate freely. A cam floor 215a is disposed above the scissors cam arm 215 to freely slide into the first cam hole 213b, and a pin 217 is disposed below the scissors cam arm 215 so as to be close to the other end of the lever 77. ) Is placed.

In addition, although not shown in FIG. 22, each of the first cam hole 213b and the second cam hole 213c has a cam groove made of an arc that maintains a constant distance with respect to the center of the drive cam 213, and the distance gradually decreases. A plurality of cam grooves formed by changing arcs are formed in succession. Accordingly, the drive cam 213 is driven by the pulse motor 201 and rotates in a predetermined direction so that the cam floors 215a and 214a fitted into the first cam hole 213b and the second cam hole 213c are driven by the drive cam ( 213) maintain a constant distance to the center of the distance or fall or approach. When the fall or approach the scissors cam arm 215, the front and rear cam arm 214 is rotated in a predetermined direction through the cam floor (215a) (214a).

And the upper thread cutting base 205 is moved back and forth through the pin 216 by the rotation of the front and rear cam arm 214. In addition, the lever 77 is rotated through the pin 217 by the rotation of the scissors cam arm 215.

Next, the lower thread cutting device 230 will be described. 24 and 25, the lower thread cutting device 230 is a lower thread scissors 52, a lower thread closing means 240, and a lower thread releasing means having substantially the same configuration as the lower thread cutting device 50 according to the first embodiment. 245 is provided, and the drive means 233 is provided.

The driving means 233 includes a pulse motor 231, a second driving cam 234, an L-shaped first link arm 235, and an L-shaped second link arm 236.

The pulse motor 231 is supported on the bottom surface of the base 232 (not shown in FIG. 24) fixed inside the bed part 2. The drive shaft 231a of the pulse motor 231 protrudes upward from the base 232 and freely rotates about the base 232.

The second drive cam 234 is disposed above the base 232. The second drive cam 234 is a substantially disk-shaped member whose center portion (rotational center) is fixed to the drive shaft 231a and rotates together with the drive shaft 231a. The detection part 234a is formed in the outer peripheral part of the 2nd drive cam 234, and the sensor 237 detects the edge 234d of this detection part 234a. The sensor 237 detects that the rotation angle of the second driving cam 234 is in an initial state by detecting the edge 234d.

The second driving cam 234 is formed with a first cam hole 234b and a second cam hole 234c.

The L-shaped first link arm 235 is attached to the bed portion so as to be free to rotate in the axial direction in the vertical direction at its bent portion. At one end of the first link arm 235, a cam floor 235a is disposed to engage freely with the first cam hole 234b. The other end is connected to the rear end of the link member 241 of the lower thread closing means 240 to rotate freely. The front end of the link member 241 is connected to one end of the lower thread cutting link 242 to rotate freely.

The L-shaped second link arm 236 is attached to the bed portion so as to rotate freely in the axial direction in the vertical direction at the bent portion. At one end of the second link arm 236, a cam floor 236a is disposed to engage freely with the second cam hole 234c. The other end is connected to freely rotate the rear end of the link member 67 of the lower thread release means 245.

Each of the first cam hole 234b and the second cam hole 234c of the second drive cam 234 has a cam groove that maintains a constant distance with respect to the center of the drive cam 234 as shown in FIG. Cam grooves are formed in succession. Accordingly, the cam drive 235a and 236a fitted to the first cam hole 234b and the second cam hole 234c are driven by the second driving cam 234 driven by the pulse motor 231 to rotate in a predetermined direction. Maintain a constant distance to the center of the two-drive cam 243 or fall or approach. The L-shaped first link arm 235 and the L-shaped second link arm 236 are rotated in a predetermined direction through the cam floors 235a and 236a.

The lower thread scissors 52 are closed by the rotation of the first link arm 235, and the lower thread scissors 52 are opened by the rotation of the second link arm 236.

Next, operations of the upper thread cutting device 200 and the lower thread cutting device 230 will be described. During sewing of the sewing machine, the upper thread cutting device 200 is in the initial state.

1. The edge 213d is detected by the sensor 218 and the pulse motor 201 and the drive cam 213 are in the initial rotational position. Each of the cam floor 214a and the cam floor 215a is located approximately at the center of the second cam hole 213c and the first cam hole 213b.

2. The lever 77 is located at the rear by the force of the tension spring 78. The upper thread scissors 80 are opened at a predetermined standby position.

3. The right side of the latch cam 211 and the left side of the latch cam 208 are in contact with each other. Accordingly, the rotation of the upper thread cutting base 205 to the right side by the tension spring 212 is inhibited.

4. The cam surface 210a of the cam member 210 does not contact the cam surface 207a of the cam member 207.

In addition, the lower thread cutting device 230 is in the initial state.

1. The edge 234d is detected by the sensor 237 and the pulse motor 231 and the second drive cam 234 are in the rotational position of the initial state.

2. The cam floor 235a and the cam floor 236a are located substantially at the centers (point S and point R in Fig. 24) of the first cam hole 234b and the second cam hole 234c, respectively.

3. The extension part 56b of the wee | mesh 56 does not contact the edge part 51b of the needle board stand 51, and the bobbin thread scissors 52 are open | released in a predetermined | prescribed standby position.

After the end of sewing, when the pulse motor 201 rotates forward, the drive cam 213 rotates in the counterclockwise direction (the arrow k direction in FIG. 23), and the cam floor 215a slides along the first cam hole 213b. However, at this time, the distance between the cam floor 215a and the center of the drive cam 213 is constant so that the scissors cam arm 215 does not rotate.

On the other hand, by the rotation of the drive cam 213, the cam floor 214a slides along the second cam hole 213c. At this time, the distance between the center of the drive cam 213 and the cam floor 214a increases according to the shape of the second cam hole 213c. Accordingly, the cam floor 214a moves backward, and the front and rear cam arms 214 rotate clockwise (arrow h in FIG. 23).

Accordingly, the pin 216 rotates forward, and the upper thread cutting base 205 moves forward. When the latch cam 211 moves forward together with the upper thread cutting base 205, the contact between the right side of the latch cam 211 and the left side of the latch cam 208 is released, and the cam surface 207a and the cam surface 210a are released. The distance from) also increases. When the contact between the right side of the latch cam 211 and the left side of the latch cam 208 is released, the front end of the upper thread cutting base 205 by the force of the tension spring 212 is centered around the rotary base 206 Rotate to the right.

The cam contact portion 86a contacts the closing plate 25 by the rotation of the upper thread cutting base 205 to the right. And similarly to the first embodiment, the upper thread shears 80 are closed. The upper thread shears 80 are closed and the upper thread is cut and at the same time, the upper thread is fixed.

After cutting again, the drive cam 213 rotates counterclockwise, but the distance between the cam floor 214a and the center of the drive cam 213 is constant. Therefore, the front and rear cam arms 214 are not rotated, and at the same time, the movement to the front of the upper thread cutting base 205 also stops.

Thereafter, the pulse motor 201 rotates in reverse and stops when the drive shaft 201a of the pulse motor 201 returns to the initial state. By this reverse rotation, the drive cam 213 rotates clockwise (in the direction of arrow j in FIG. 23), and the scissors cam arm 215 does not rotate through the cam floor 215a, but the front and rear cam arms through the cam floor 214a. Reference numeral 214 rotates counterclockwise so that the upper thread cutting base 205 moves backward.

When the cam member 210 moves backward along with the upper thread cutting base 205, the cam surface 210a and the cam surface 207a come into contact with each other. In addition, when the cam member 210 moves backward along with the upper thread cutting base 205, the front end of the upper thread cutting base 205 is contacted with the cam member 210 and the cam member 207 by the portion of the tension spring 212. Rotate left against forces

When the pulse motor 231 of the lower thread cutting device 230 is rotated forward after finishing sewing, the second driving cam 234 rotates clockwise (n direction of FIG. 24). Accordingly, the cam floor 236a slides along the second cam hole 234c, but the distance between the cam floor 236a and the center of the second driving cam 234 is constant so that the second link arm 136 does not rotate. Do not. On the other hand, the cam floor 235a slides along the first cam hole 234b, and the distance between the center of the second driving cam 234 and the cam floor 235a becomes smaller depending on the shape of the first cam hole 234b. Accordingly, the cam floor 235a moves to the right side, and the first link arm 235 rotates counterclockwise as viewed from the bottom (state of FIG. 24).

As the lower thread pulling arm 63 rotates counterclockwise as the first link arm 235 rotates, the lower scalpel 57 rotates clockwise. The lower thread pulling arm 63 rotates and pulls the lower thread toward the lower scalpel 57. Meanwhile, the lower thread scissors 52 are closed by the rotation of the lower blade 57, and the lower thread thread 52 is cut and fixed.

After cutting the lower thread, the second driving cam 234 rotates clockwise again, but at this time, the distance between the center of rotation of the cam floor 235a and the second driving cam 234 is constant, so that the first link arm 235 rotates. I never do that. Therefore, the lower thread scissors 52 are also located at the cutting position in the closed state without rotation.

Thereafter, the pulse motor 231 rotates in reverse and stops when the drive shaft 231a of the pulse motor 231 returns to the initial state. When the pulse motor 231 reversely rotates, the second driving cam 234 rotates counterclockwise, so that the second link arm 236 does not rotate through the cam floor 236a but the first through the cam floor 235a. The link arm 235 rotates clockwise. As the first link arm 235 rotates, the lower thread scissors 52 return to the initial position in the closed state.

Then, when the start switch is operated by the operator, the sewing machine starts sewing the next cycle. At the start of sewing, the pulse motor 201 rotates in the reverse direction, and the drive cam 213 rotates in the clockwise direction (j direction in FIG. 23).

In this rotation, since the distance between the cam floor 214a and the center of rotation of the drive cam 213 is constant, the front and rear cam arms 214 do not rotate and the upper thread cutting base 205 does not move. On the other hand, the distance between the cam floor 215a and the rotation center of the drive cam 213 becomes small. Accordingly, the cam floor 215a moves backwards. Accordingly, the scissors cam arm 215 rotates clockwise in FIG. 23, and the pin 217 moves forward. Further, the pin 217 pushes the other end of the lever 77 forward, and the lever 77 rotates counterclockwise (the arrow direction in FIG. 23) against the tension spring 78. The open cam portion 77a pushes the cam contact portion 86a by the rotation of the lever 77, and the upper thread shear 80 is opened to release the upper thread.

After the upper thread is released, the driving cam 213 rotates clockwise again, but the distance between the cam floor 215a and the center of rotation of the driving cam 213 is constant, so the scissors cam arm 215 does not rotate and the scissors cam arm 215 is a lever. It stops by pushing (7) forward.

At the same time, the cam floor 214a also slides along the second cam hole 213c, but the distance between the center of rotation of the drive cam 213 and the cam floor 214a becomes small. Accordingly, the front and rear cam arms 214 rotate counterclockwise, and the pins 216 rotate backwards. Moreover, the cam member 210 moves toward the rear side together with the upper thread cutting base 205 and contacts the cam member 207. Accordingly, the thread cutting base 205 is rotated to the left against the force of the tension spring 212.

When the upper thread cutting base 205 rotates to the left, the cam surface 211a of the latch cam 211 contacts the cam surface 208a of the latch cam 208. When the upper thread cutting base 205 rotates to the left, the cam surface 211a pushes the cam surface 208a, and the latch cam 208 rotates upward with respect to the rear end thereof. Eventually, the latch cam 211 moves to the left of the latch cam 208, and the contact between the cam surface 211a and the cam surface 208a is released. Thereafter, the latch cam 208 rotates downward about its rear end by the force of the tension spring 209.

When the upper thread cutting base 205 rotates to the left side, the left side of the latch cam 208 and the right side of the latch cam 211 come into contact with each other. In this state, even if the reverse rotation of the motor 201 stops, the rotation to the right of the upper thread cutting base 205 is suppressed. Here, the left and right positions of the upper thread cutting base 205 become the same as the initial state. As described above, the upper thread shear 80 is returned to the standby position from the open state to the initial state.

Subsequently, when the pulse motor 201 rotates forward, the driving cam 213 rotates counterclockwise. At this time, the scissors cam arm 215 does not rotate through the cam floor 215a. Therefore, the scissors cam arm 215 is stopped in the state in which the lever 77 is pushed forward.

Meanwhile, the front and rear cam arms 214 rotate clockwise through the cam floor 214a, and the pins 216 rotate forward. Moreover, the cam member 210 moves forward together with the upper thread cutting base 205, and eventually the front and rear positions of the upper thread cutting base 205 become the same position as the initial state.

In addition, the drive cam 213 rotates in the counterclockwise direction, but the distance between the cam floor 214a and the center of rotation of the drive cam 213 is constant, so that the front and rear cam arms 214 do not rotate. Therefore, the upper thread cutting base 205 does not move as it is, and the upper thread scissors 80 do not move from the standby position.

Meanwhile, the cam cam 215 rotates counterclockwise through the cam floor 215a, and the pin 217 rotates backward. As a result, the lever 77 rotates clockwise by the force of the tension spring 78, and the open cam portion 77a is separated from the cam contact portion 86a.

Subsequently, when the controller reversely rotates the pulse motor 231, the second driving cam 234 rotates in the counterclockwise direction (m direction in FIG. 24).

In this rotation, the distance between the cam floor 235a and the center of rotation of the second drive cam 234 is constant, so that the first link arm 235 does not rotate and the bobbin shear 52 does not move.

Meanwhile, as the distance between the center of rotation of the second driving cam 234 and the cam floor 236a decreases, the second link arm 236 rotates clockwise from the bottom. As the second link arm 236 rotates, the operation arm 68 rotates counterclockwise from the bottom. Thereby, the extension pin 68a of the front end of the operation arm 68 presses the pin 56a. Accordingly, the upper blade 56 rotates to unwind the bobbin thread while the bobbin shear 52 is opened.

In addition, when the second driving cam 234 rotates in the counterclockwise direction, since the distance between the cam floor 236a and the center of rotation of the second driving cam 234 is constant, the second link arm 236 does not rotate. . Therefore, the lower thread shears 52 remain open.

Subsequently, when the pulse motor 231 rotates forward, the second driving cam 234 rotates clockwise. By this rotation, the first link arm 235 does not rotate and the bobbin shear 52 does not move through the cam floor 235a. On the other hand, the second link arm 236 rotates counterclockwise from the bottom through the cam floor 236a. As the second link arm 236 rotates, the actuating arm 68 rotates clockwise from the bottom and the contact between the directing pin 68a and the pin 56a of the actuating arm 68 is released. The lower thread cutting device 230 returns to the initial state as described above.

According to the second embodiment described above, the pulse motor 201 is disposed in the upper thread cutting device 200, and the pulse motor 231 is disposed in the lower thread cutting device 230. It was configured to release the yarn, and these operations were driven independently of other mechanisms such as cloth transfer. Therefore, the same effects and effects as in the first embodiment described above can be exhibited.

In addition, although the motor and the solenoid are shown as an operation means, cylinders etc. can be mentioned, It may be arrange | positioned in the upper thread and the lower thread, respectively, and may be comprised so that one operation means may be used for both liberation.

Representative effects of the present invention include operating means for each of the release of the upper thread by the upper thread scissors, and the release of the lower thread by the lower thread scissors. Use independent drive sources without interlocking with other instruments. Therefore, the seam may be formed so that the sewing start position and the sewing end position are set through the input means so that the sewing start position and the sewing end position are different positions under the control of the control means.

Therefore, elimination of unnecessary sewing is eliminated, so the appearance is improved, the quality of the sewing is improved, and the cycle time can be shortened.

In addition, since the drive source and the cloth transfer mechanism for thread release are separated in this way, the sun knife which forms a buttonhole while sending a cloth before sewing becomes possible.

As mentioned above, according to this invention, it can fully respond to various designs and sewing methods.

Claims (6)

The upper thread passes, and the needle which shakes with respect to the to-be-sealed object by rotation of the main shaft, The drum which is in the lower part of the sewing object and supplies a lower thread, Cloth pressing means for pushing the sewing object, Moving means for relatively moving the needle and the cloth pressing means to form a knitting seam around the buttonhole, Upper thread cutting means having upper thread scissors for cutting the upper thread to fix the upper thread after cutting; In the buttonhole knitting machine provided with a bobbin cutting means having a bobbin scissors for cutting the bobbin thread to fix the bobbin thread after cutting, An actuating means for each of releasing the upper thread fixing by the upper thread scissors and releasing the lower thread fixing by the lower thread scissors; Input means for inputting the shape of the button hole cutting and the sewing start position and the sewing end position as the button hole cutting data; Storage means for storing buttonhole cutting data input from the input means; Read the button hole cutting data stored in the memory means, and move the needle and the cloth pressing means by the moving means, sew from the sewing start position to the sewing end position, and operate the upper thread cutting means and the lower thread cutting means to operate the upper thread and A buttonhole sewing machine, characterized in that it comprises a control means for cutting, fixing and releasing each of the lower thread. The method of claim 1, It is possible to set the release timing for each of the upper and lower chambers by the upper thread scissors and the lower thread scissors separately through the input means. The control means drives the operation means on the basis of the set timing, and release the upper and lower threads each sewing thread immediately after the start of sewing. The method of claim 2, Detecting means for detecting the rotational speed of the main shaft, And a control means for suitably changing and controlling the release timing set through the input means in response to the rotational speed of the main shaft detected by the detection means to release the upper thread and the lower thread. The method according to any one of claims 1 to 3, The cloth pressing means includes a cloth pressing portion for pressing the to-be-sealed material so as to surround the buttonhole cutting formed in the to-be-sealed material, A buttonhole thread sewing machine, characterized in that the position of the buttonhole tightening with respect to the cloth pressing portion can be set through the input means. The method according to any one of claims 1 to 3, The cloth pressing means includes a cloth pressing portion for pressing the sewing object to surround a plurality of sewing points including a buttonhole cutting formed in the sewing object. It is possible to set several sewing points through the input means, and at the same time, it is possible to set data on each sewing position of several sewing points. A control means for sewing a buttonhole sewing machine, characterized in that for sewing a plurality of sewing points continuously while moving relative to the needle and the cloth pressing means by the moving means without raising the cloth pressing portion. The method of claim 4, wherein The control means can set heterogeneous pattern button hole cutting data including pattern data of several different button hole cutting seams through the input means, A button hole knitting machine, characterized in that a plurality of types of button hole cutting are successively formed on the basis of heterogeneous pattern button hole cutting data.