JP2000317185A - Buttonholer sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buttonholer sewing machine capable of easily executing the operation of inserting a thread into the eye of a needle when the thread- disconnection is detected and the buttonholing operation is suspended. SOLUTION: This buttonholer sewing machine stops a machine motor to suspend the sewing operation when breaking of a sewing thread is detected during the buttonholing operation. At the time, a control device drives/controls a stepping motor to operate a sewing mechanism and moves the needle moving position of a needle bar 15 to the right end in the oscillation range (b). Then, since a cutter 13 is not present behind a needle 16, a user can insert a hand from the right side of the needle 16, so that a thread can be inserted into the eye of the needle easily. After that, the sewing operation will be started again at the sewing position before the suspension by the user stepping on a pedal to turn a starting switch on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole sewing machine which forms buttonholes on a work cloth and then cuts the work cloth between the keyhole seams to form buttonholes.

[0002]

2. Description of the Related Art Conventionally, a buttonhole sewing machine that forms a buttonhole by forming a buttonhole after forming a buttonhole seam on a work cloth has been controlled according to an external sewing command. The device controls the driving of the upper shaft driving device, the feed plate driving device, and the swing driving device based on the needle movement data stored in advance, and performs sewing operations such as a cloth feeding operation and a needle swinging operation. Forming a seam. And, after the overcast seam is formed,
The control device drives the cutter up and down to cut the work cloth between the overlock stitches and form the button holes, thereby completing the buttonhole forming operation.

[0003] A series of operations for forming a buttonhole in a work cloth, from forming a buttonhole stitch to opening a buttonhole with a cutter in this manner, are automatically terminated when an external command is input. Executed until For this reason, if a thread break occurs during the sewing operation, the sewing operation proceeds in a state in which the buttonhole stitch is not formed in the work cloth, and the work cloth in which the buttonhole seam is not completely formed is cut by the cutter. Button holes will be opened. If the work cloth is opened in a state in which the buttonhole seam is not formed, the button hole cannot be formed, and the work cloth becomes useless, so that the work cloth is wasted. Will be.

[0004] In order to solve such a problem, a hole sewing machine having a sewing thread breakage detecting device is known.
In the overlock sewing machine equipped with this thread break detection device,
If a thread break is detected by the thread break detecting device during the sewing operation, the operation of the buttonhole stitch sewing machine is stopped at that time, so that the sewing operation is not further advanced. Then, after the sewing thread is inserted through the sewing needle, the needle bar (sewing needle) is moved to a position where the continuation of the buttonhole stitch in the middle of sewing is sewn, and the sewing operation is restarted to complete the buttonhole stitch. Therefore, the button hole is not opened by the cutter with respect to the work cloth on which the buttonhole stitch is not formed, and it is possible to prevent the work cloth from being wasted.

[0005]

However, in the above-described conventional overlock sewing machine, the position where the needle bar, that is, the sewing needle stops when the operation is interrupted by detecting the thread breakage is uncertain. Since the needle bar is fixed at a stop position by a driving device (such as a step motor), it becomes difficult to thread the sewing needle depending on the position where the sewing needle has stopped. Specifically, if the sewing needle stops just before the cutter for opening the buttonhole, the cutter becomes an obstacle,
The threading operation becomes difficult.

By the way, in the buttonhole sewing machine, a sewing needle for forming a buttonhole stitch and a cutter for opening a work cloth are required to work on the same position of the work cloth to form a button hole. The sewing needle and cutter are generally located in close proximity. And, for example,
In a sewing machine in which the sewing needle is located on the near side and the cutter is located on the back side when viewed from the operator, the sewing needle swings right and left relative to the worker immediately before the cutter. Forming a buttonhole seam. In such a sewing machine, the sewing thread is configured to be inserted from the back side toward the front side into the needle hole of the sewing needle. Turn and perform threading work,
Insert the sewing thread through the sewing needle. Therefore, if the sewing needle is stopped just before the cutter due to a thread break, the cutter will be an obstacle because the cutter exists behind the sewing needle, which is the working range of the operator who performs the threading operation. This makes it difficult to insert the sewing thread.

[0007] As an example, FIG. 7 shows a front view of a lower portion of the arm portion 8 of the hole sewing machine M. As shown in FIG. 7, below the arm portion 8, a sewing needle 16 attached to the lower end of the needle bar 15, a cutter 13 attached to a cutter holder 41, a presser arm 30 urged downward, and a cloth presser. The work clamp 31 presses and fixes a work cloth (not shown) arranged on the bed 6. And FIG.
(A) shows the case where the sewing needle 16 is located slightly before and to the left of the cutter 13 in the swing range of the sewing needle 16.

In FIG. 7A, a cutter 13 attached to a cutter holder 41 exists on the right side of the sewing needle 16 attached to the lower end of the needle bar 15 (see FIG. 2). On the left side of the sewing needle 16, the presser arm 3 urged downward is
0 and the presser foot 31 exist. For this reason, FIG.
When the needle bar 15 is located slightly before and to the left of the cutter 13 as shown in the figure, when the hand is moved from the left side of the needle bar 15 to the back side of the needle bar 15, the cloth presser 31 becomes an obstacle. Needle bar 1
When the hand is moved from the right side of the needle 5 to the back side of the needle bar 15, the threading work becomes difficult because the cutter 13 becomes an obstacle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a buttonhole sewing machine in which a thread break is detected, when a thread break is detected and a sewing operation for forming a buttonhole is interrupted, a sewing operation is performed. An object of the present invention is to provide a buttonhole sewing machine that can easily perform a threading operation on a needle.

[0010]

According to the first aspect of the present invention, there is provided an apparatus for rotating a needle bar on which a sewing needle is removably mounted, by reciprocating the needle bar up and down. A shaft drive means, a feed base drive means for driving the feed base to feed the work cloth, and an electric motor for oscillating the needle bar in a direction intersecting the cloth feed direction by the feed base. A dynamic drive unit, a sewing control unit for forming a hole stitch on the work cloth by simultaneously controlling the driving of each of the drive units according to a sewing command from the outside, and the hole forming unit formed by the sewing control unit. Cutting means for cutting the work cloth between the seams to form a button hole;
A thread breakage detecting means for detecting a thread breakage of a thread inserted through the sewing needle; and, when a thread breakage is detected by the thread breakage detecting means, the drive control by the sewing control means is interrupted and the drive A sewing operation interrupting means for stopping the means at a drive position at the time of detection of thread breakage, and the sewing operation interrupting means interrupts driving control by the sewing control means. Power supply stopping means for stopping power supply to the swing driving means and enabling manual swinging of the needle bar is provided.

That is, the buttonhole sewing machine according to the present invention (claim 1) detects that a thread inserted through a sewing needle is cut during execution of a sewing operation for forming a buttonhole seam. The drive control by the sewing control means is interrupted. Then, after the sewing operation is interrupted, the power supply to the swing driving means including an electric motor for swinging the needle bar is stopped.

Here, when the drive control by the sewing control means is interrupted and the sewing operation is interrupted, the swing of the needle bar is also stopped, but the power supply to the swing drive means is continued. Then, since the swing driving means generates a force so as to maintain the state, the needle bar is fixed at the stopped position. However, when the power supply to the swing driving means is stopped, the force for fixing the needle bar does not act, so that the needle bar can be swung by an external force. Then, since the needle bar can be swung by the external force, the worker can move the needle bar to a position where the threading operation is easy.

Therefore, according to the buttonhole sewing machine of the present invention (claim 1), after detecting the thread breakage and interrupting the sewing operation, the power supply stopping means switches the power supply to the swing drive means. By stopping the operation, the operator can manually move the needle bar in the swinging direction, thereby facilitating the threading operation of the sewing needle.

[0014] Further, as the hole-locking sewing machine which facilitates the threading operation to the sewing needle after the sewing operation is interrupted due to thread breakage, the upper shaft is rotated by rotating the upper shaft. An upper shaft driving means for vertically reciprocating a needle bar on which a sewing needle is detachably mounted, a feed table driving means for driving a feed table to feed a work cloth, and a cloth feeding direction by the feed table. In the intersecting direction, a swing driving means comprising an electric motor for swinging the needle bar, and a sewing command from the outside, according to a sewing command, by simultaneously controlling the driving of the respective driving means, thereby forming a hole stitch on the work cloth. Sewing control means to be formed, cutting means for cutting a work cloth between the overlock stitches formed by the sewing control means to form a buttonhole, and detection of thread breakage of a thread inserted through the sewing needle Thread break detection hand And a sewing operation interrupting means for interrupting the drive control by the sewing control means when the thread breakage detecting means detects the thread breakage, and stopping each of the driving means at the drive position at the time of detecting the thread breakage. The sewing machine according to claim 1, wherein the sewing operation interrupting unit interrupts driving control by the sewing control unit, and then drives and controls the swing driving unit to move the needle bar from the cutting unit. Needle bar retreat control means for moving to a retreat position where threading is easily performed may be provided.

That is, the buttonhole sewing machine according to the present invention (claim 2) detects that a thread inserted through a sewing needle is cut during execution of a sewing operation for forming a buttonhole seam. The drive control by the sewing control means is interrupted. Then, after the sewing operation is interrupted, the swing driving means including an electric motor provided for swinging the needle bar is drive-controlled to swing the needle bar to a retracted position away from the cutting means. This facilitates the threading operation.

As described above, after the sewing operation is interrupted by the detection of the thread break, the needle bar retreat control means moves the needle bar to the retreat position, so that the operator does not manually swing the needle bar. The threading operation can be easily performed. Therefore, according to the buttonhole sewing machine of the present invention (claim 2), after detecting the thread break and interrupting the sewing operation, the needle bar retreat control means moves the needle bar to the retreat position, The threading operation can be easily performed without the operator swinging the needle bar by manual operation.

By the way, if the sewing operation is interrupted by detecting the breakage of the thread, the hole-locking seam is an unfinished state in which the hole-locking seam is formed only in the middle of sewing. After inserting the sewing thread into the sewing needle,
It is necessary to move the needle bar (sewing needle) to the sewing position for sewing the continuation of the buttonhole stitch during sewing, and restart the sewing operation. However, the positioning operation of the sewing needle for restarting the sewing is not easy, and it is necessary to set from which part of the stored needle operation data a series of sewing operations is restarted.

Therefore, as in the invention according to claim 3,
3. The sewing machine according to claim 1, wherein the sewing operation interrupting unit interrupts the drive control by the sewing control unit, and then, when a sewing restart command is input from outside, the sewing operation is stopped. The sewing machine may further include a sewing operation resuming unit that drives and controls the dynamic driving unit to return the needle bar to the driving position at the time when the thread break is detected, and then resumes the driving control by the sewing control unit.

That is, when the threading operation to the sewing needle is completed and a sewing restart command is input by the operator, the sewing operation restarting means returns the needle bar to the drive position at the time of detecting the thread breakage, and suspends. The sewing operation that has been performed is restarted. As a result, the sewing operation can be restarted in order to complete the partially completed unfinished buttonhole stitch by a simple operation of inputting a sewing restart command.

Therefore, according to the buttonhole sewing machine of the present invention (claim 3), the sewing operation interrupted by a simple operation of inputting a sewing restart command after the threading operation to the sewing needle is completed. Can be easily restarted, and the button hole can be efficiently formed.

By the way, the buttonhole sewing machine forms the buttonhole stitch by controlling the position of the feed bar and the position of the needle bar to determine the position of the sewing needle with respect to the work cloth. When the needle bar is moved by an external force, as in the overlock sewing machine described in (1), the control device cannot recognize the accurate position of the needle bar. Further, even when the needle bar is fixed by the swing drive control means as in the hole sewing machine according to the second aspect, an erroneous external force acts during the threading operation, so that the position of the needle bar is reduced. There is a possibility that an error may occur between the position of the needle bar which is moved and recognized by the control device and the actual position of the needle bar.

Therefore, as in the invention according to claim 4,
4. The origin detecting device according to claim 3, wherein the needle drive bar is rocked by controlling the drive of the rocking drive means to detect a reference position of a rocking position of the needle bar. Means for resuming the drive control by the sewing control means, based on an origin position of the needle bar detected by the origin detection means, to cut the needle bar. It is preferable to return to the drive position at the time of detection.

That is, when the sewing restart command is input and the interrupted sewing operation is restarted, the origin detecting means detects the origin position of the needle bar, and the sewing operation resuming means detects the origin position based on the detected origin position. Then, the needle bar is returned to the drive position where the thread break is detected. Thus, before restarting the sewing operation,
By detecting the home position of the needle bar, the buttonhole sewing machine can accurately recognize the position of the needle bar, and the hole formed partially along the hole and the seam caused by the sewing operation after restarting are displaced. Can be prevented.

According to the buttonhole sewing machine of the present invention (claim 4), when restarting the interrupted sewing operation,
By detecting the origin position of the needle bar, it is possible to prevent the gap between the buttonhole stitch caused by the sewing operation after restarting and the seam formed before the sewing operation was interrupted, and reduce the product value It is possible to form a buttonhole seam without having to do this.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view illustrating an appearance of a hole sewing machine M according to a first embodiment to which the present invention is applied. The buttonhole sewing machine M according to the present embodiment forms a buttonhole seam 70 (see FIG. 5) or the like on a work cloth (not shown), and the edge of the holehole seam 71, 7.
This is a buttonhole sewing machine for a so-called buttonhole in which a buttonhole 80 is formed by cutting between the two.

As shown in FIG. 1, an overlock sewing machine M
A sewing machine table 1, a sewing machine motor 2, a pedal 3 for starting or stopping the sewing machine motor 2, an operation panel 4 for inputting various data of a buttonhole sewing operation, and a drive control of each unit described later. And a start switch 59 for transmitting a start command to the control device 5 based on the operations of the bed portion 6, the pillar portion 7, the arm portion 8, and the pedal 3.

The start switch 59 is turned off when the pedal 3 is not depressed.
Is turned on, and a signal indicating this state is input to the control device 5. Next, FIG. 2 is a right side view illustrating a main configuration of a sewing mechanism of the buttonhole sewing machine M.

As shown in FIG. 2, an overlock sewing machine M
A sewing mechanism 10 as a sewing means for forming a buttonhole stitch 70 on a work cloth;
And a feeder drive mechanism 12 (see FIG. 3) for driving the feeder 11 in the cloth feed direction, and cutting the work cloth between the overlock seams 71 and 72 of the overlock seam 70 of the work cloth to form the button hole 80. The cutter 13 includes a cutter 13 as a cutting unit to be formed, a cutter driving mechanism (not shown) for driving the cutter 13 up and down, and a thread breakage detecting mechanism 18 as a thread breakage detecting unit for detecting a thread breakage of the sewing thread 14.

The sewing mechanism 10 includes a needle bar 15 provided on the head 8a of the arm 8, a sewing needle 16 removably attached to the lower end of the needle bar 15, and a needle bar 15 vertically. A needle bar drive mechanism 17 (see FIG. 4) that reciprocates and swings right and left, and a shuttle (not shown) that is provided on the bed section 6 and cooperates with the sewing needle 16 to form a hole stitch.
Then, by driving the sewing mechanism 10 while feeding the work cloth with the feed stand 11, for example, a general overlock stitch 70 shown in FIG. 5 can be formed.

Then, as shown in FIG. 5, the buttonhole seam 70 includes a left edge overlock seam 71 and a right edge overlock seam 7.
The front end portion has a front bar-tacking seam 73.
And a rear bar-tack seam 74 at the rear end. During normal sewing, a seam is formed in the order of a part of the front bar tack seam 73, the left edge overlock seam 71, the rear bar tack seam 74, the right edge over seam 72, and the remaining part of the front bar tack seam 73. You. In addition, the length g, shown in FIG.
a, f, etc. are data set on the operation panel 4.

Further, the thread breakage detecting mechanism 18 is provided at the projecting portion 18a projecting from the upper portion of the head 8a of the arm portion 8 toward the front of the buttonhole sewing machine M, and at the projecting portion 18a. A rotating shaft 18b, one end of which is rotatably provided on the rotating shaft 18b, and the other end 18f is provided at an intermediate position between the thread hooking member 18c which can be hooked on the sewing thread 14 and the thread hooking member 18c. And a thread breakage detection sensor 18e protruding forward from the head 8a below the protruding portion 18a toward the front of the buttonhole sewing machine M.

The end 18f of the threading member 18c is
When the sewing thread 14 is hooked from the balance (not shown) toward the sewing needle 16, the thread hooking member 18 c is maintained in an inclined state, and this state indicates a normal state of the sewing thread 14. In this state, if the thread breaks in the sewing thread 14,
The end 18f separates from the sewing thread 14, and the thread hooking member 18c turns around the turning shaft 18b due to gravity and turns in the vertical direction. Then, the end 18f is located directly below the rotation shaft 18b, and the reflector 18d is located right beside the thread break detection sensor 18e.

Here, the thread breakage detection sensor 18e is configured to detect that the reflection plate 18d is located right beside, and outputs a detection signal to the control device 5. For this reason,
When the thread breakage of the sewing thread 14 occurs and the reflection plate 18d is positioned right beside the thread breakage detection sensor 18e, the thread breakage detection sensor 18e outputs a thread breakage detection signal to the control device 5.

As described above, the thread breakage detecting mechanism 18
When a break in the sewing thread 14 is detected, a breakage detection signal is output to the control device 5. Next, the feed base 11 and the feed base drive mechanism 12 will be described.
FIG. 2 is a right side view illustrating a configuration of a main part of the sewing mechanism 10, and FIG. 3 is a perspective view illustrating a configuration of the feed base driving mechanism 12.

As shown in FIG. 2 and FIG. 3, the feed base 11 is formed in a long plate shape in front and rear, and has a long hole 11a for forming a buttonhole seam 70 and a button hole 80 at the front end thereof.
Are formed. A pair of left and right guide plates 20 are fitted into the upper surface of the bed portion 6.
The feed base 11 is supported so as to be movable back and forth.

The feed base drive mechanism 12 includes a movable member 21 fixed to the lower surface of the rear end of the feed base 11, a movable member 22 fixedly connected to the movable member 21 by a long connecting rod 23 in the front and rear directions, A stepping motor 24 for driving the movable member 22 back and forth by a mechanism described below is provided.

The connecting rod 23 extends in the longitudinal direction of the feed base 11 and is inserted through the left ends (far side in FIG. 3) of the movable members 21 and 22 when viewed from the front.
Through a pair of bearings 25 provided to sandwich
A guide is supported by the sewing machine frame so as to be movable in the longitudinal direction of the feed stand 11. The movable member 2 when viewed from the front
A rod 26 extending in the longitudinal direction of the feed stand 11 is fixedly provided at the right end of the feeder 1, and the movable member 22 is movable back and forth through a bearing 22 a provided at the right end.
The guide is supported.

A drive pulley 27 is fixed to the output shaft of the stepping motor 24, and a driven pulley (not shown) is fixedly provided on the sewing machine frame behind the drive pulley 27, and an endless belt 28 is provided on both pulleys. Has been passed over. When the above-described movable member 22 is fixed to a part of the belt 28 and the stepping motor 24 is driven, the feed base 11 is driven back and forth together with the movable members 22 and 21.

By the way, the rear end of the presser arm 30 having the cloth presser 31 attached to the front end of the movable member 22
1 is connected so as to be rotatable around an axis in a direction orthogonal to the driving direction. The presser foot 31 is urged downward by an urging member (not shown) via the presser arm 30 so that the work presser 31 can press and fix the work cloth on the feed base 11.

The cutter 13 is mounted via a screw 41a to a cutter holder 41 at the lower end of a cutter mounting shaft 40 which is vertically moved by a cutter driving mechanism (not shown). The cutter driving mechanism includes a cutter driving solenoid 45.
(See FIG. 6).

FIG. 4 is a perspective view showing the structure of the needle bar drive mechanism 17. As shown in FIG. As shown in FIG. 4, in the needle bar driving mechanism 17, the above-described needle bar 15 is supported by a needle bar base 51 slidably provided on the arm portion 8 so as to be vertically slidable. Further, a needle bar holder 52 is fixed to the needle bar 15 at a predetermined position.

On the other hand, the other end 53b of the needle bar connecting rod 53 whose one end 53a circularly moves along the circle C in the vertical plane is
Is connected to the needle bar holder 52 via the. A guide groove 52a having a rectangular cross section in the left-right direction is formed on the square piece 54 side of the needle bar holder 52, and the square piece 54 is movably engaged in the left-right direction with the guide groove 52a. A corner piece 55 is provided on the other end 53b of the needle bar connecting rod 53 on the side opposite to the side on which the corner piece 54 is provided. By engaging the square piece 55 with the vertical groove 56a of the needle bar connecting rod guide 56, the other end 53b of the needle bar connecting rod 53 is guided so as to be movable only in the vertical direction. Further, a flat needle bar guide 57 is fixed to the side surface of the needle bar base 51. The needle bar guide 57 is formed with an elongated hole 57a extending along the needle bar 15, and a projection 52b projecting from the side surface of the needle bar holder 52 is engaged with the elongated hole 57a. The tip of a swing lever 62 that swings integrally with the output shaft 61 a of the stepping motor 61 is connected to a lower end of the needle bar base 51 via a square piece 63.

In the needle bar driving mechanism 17 configured as described above, the force applied to the needle bar connecting rod 53 from the upper shaft 64 rotated and driven by the sewing machine motor 2 is transmitted to the needle bar 15 via the square piece 54. Thus, the needle bar 15 can be moved up and down. Further, the force applied to the swing lever 62 from the stepping motor 61 is applied to the needle bar base 51 via the square top 63.
, Whereby the needle bar 15 can be swung right and left. By the cooperation of the two, it becomes possible to execute the sewing of the above-described buttonhole stitch 70 and the like. Further, by controlling the swing width of the stepping motor 61, the width of the buttonhole stitch can be changed.

A position detecting protrusion 62a is provided at the tip of the swing lever 62, and an origin detecting sensor 65 for detecting the position of the position detecting protrusion 62a is supported by the sewing machine frame. . Then, the origin detection sensor 65
When the needle bar 15 is located at the origin position, the position detecting projection 62a is provided at a detectable position, and is configured to output a detection signal to the control device 5. Therefore, when the swing lever 62 is swung and the needle bar 15 moves to the origin position, the origin detection sensor 65 detects the position detecting protrusion 62a, indicating that the needle bar 15 is present at the origin position. An origin detection signal is output to the control device 5. Then, the control device 5 controls the swing position of the needle bar 15 based on the origin position detected by the origin detection signal.

In the overhole sewing machine M according to the present embodiment, the sewing machine motor 2 is used as the upper shaft driving means, the stepping motor 24 is used as the feed base driving means, and the stepping motor 61 is used as the swing driving means. In addition, the origin detecting sensor 65 corresponds to the origin detecting means.

Next, FIG. 6 shows the configuration of a control system of the overlock sewing machine M configured as described above. As shown in FIG. 6, the control device 5 includes a CPU 5a, a ROM 5b, and a RAM.
A start switch 59, a thread breakage detection sensor 18
e, an input interface 5d to which signals are inputted from the origin detection sensor 65 and the operation panel 4, the sewing machine motor 2, the stepping motor 24, and the stepping motor 6.
A drive signal is output to a solenoid 45 for driving the cutter 1 and the cutter 45 via a drive circuit (not shown).
And an output interface 5e for outputting a control signal such as a display state, and these are connected by a bus 5f.

The operation panel 4 includes an up switch 4a, a down switch 4b, and a reset switch 4c. Each switch is in an ON state when pressed, and is in an OFF state when not pressed. Is input to the control device 5. The up switch 4a and the down switch 4b are used to change the sewing position when the sewing operation is interrupted. When the up switch 4a is pressed, the down switch 4b is pressed so as to advance to the next sewing position. Then, the control device 5 controls the sewing operation so as to return to the previous sewing position. The reset switch 4c is also used for terminating the sewing operation in the middle of progress, and when pressed when the sewing operation is interrupted, the control device 5 performs processing so as to end the sewing operation.

Next, the processing executed by the control device 5 will be described below. In addition, the control device 5 stores the hand movement data relating to the sewing operation such as the length of each part of the buttonhole seam 70 in the RAM 5c, and forms the holehole seam 70 by performing the sewing operation based on the needle movement data. . The hand movement data can be set as required by operating an input operation unit (not shown) provided on the operation panel 4.

Then, an operation mode selection switch (not shown) provided on the operation panel 4 is operated to select the normal mode as the operation mode, and then the pedal 3 is depressed.
When the start switch 59 is turned on, the control device 5
The sewing control process is executed in.

FIG. 8 shows a flowchart of the sewing control processing of the first embodiment, and this processing will be described below.
When the sewing control process is started, first, in step S110, the stepping motor 24 and the stepping motor 61
, The sewing mechanism 10 and the feed bar drive mechanism 12 are operated, and the feed bar 11 and the needle bar 15 are moved to the sewing start position.

In step S120, the sewing machine motor 2 is started to rotate the upper shaft 64. Further, in accordance with the rotation of the upper shaft 64, the drive of the stepping motor 24 and the stepping motor 61 is controlled, so that the sewing mechanism 10 and the feed stand are controlled. Drive mechanism 1
Operate 2 Thus, the needle bar 15 is reciprocated up and down to form a stitch for one stitch on the work cloth.
1 to feed the work cloth and the needle bar 15
The sewing operation is advanced to the next sewing position by performing a needle swing operation of swinging the sewing machine in a direction intersecting the cloth feeding direction. The sewing position is specifically determined by counting the number of stitches with a counter.

When the process proceeds to S120,
If the sewing machine motor 2 has already been started, the process proceeds to S12.
In the case of 0, the sewing machine motor 2 is not started and the rotation of the sewing machine motor 2 is continued. By maintaining the rotation of the upper shaft 64 in this way, the needle bar 15 is reciprocated up and down to form a stitch for one stitch on the work cloth.
By controlling the drive of the stepping motor 24 and the stepping motor 61, the sewing operation proceeds to the next sewing position.

Here, the sewing mechanism 10 is provided with a needle-up detector and a needle-down detector (not shown), and the needle-up detector is arranged so that the position of the needle bar 15 is the uppermost position of the vertical reciprocating operation. Upon detecting that the needle bar 15 is present, the needle lower detector detects that the position of the needle bar 15 is the lowest position of the vertical reciprocating operation. When the upper shaft 64 is rotated, the needle bar 15 is reciprocated up and down. Therefore, the detection of the rotation of the upper shaft 64 is performed by using the needle upper detector and the needle lower detector.

In the following S130, the thread breakage detecting sensor 18
It is determined whether or not a yarn break has occurred based on the yarn break detection signal from e. If an affirmative determination is made, the process proceeds to S170, and if a negative determination is made, the process proceeds to S140. If a thread break has not occurred, a negative determination is made in S130, the process proceeds to S140, and in S140, it is determined whether the sewing position of the currently executing sewing operation is a sewing end position. If the determination is affirmative, the process proceeds to S150,
If a negative determination is made, the process moves to S120. The determination in S140 is specifically made by comparing a counter indicating the number of the stitch and the hand movement data. Here, when a negative determination is made in S130 and a negative determination is made in S140,
That is, thread breakage of the sewing thread 14 has not occurred, and
If the currently executed sewing operation has not progressed to the sewing end position, the processes of S120, S130, and S140 are repeatedly performed, and the sewing operation proceeds sequentially.

The sewing operation is executed as described above, and when the sewing operation proceeds to the sewing end position, an affirmative determination is made in S140, and the process proceeds to S150. In S150, the sewing machine motor 2 is stopped to end the sewing operation. In S160, the stepping motor 24 and the stepping motor 61 are drive-controlled to operate the sewing mechanism 10 and the feed base driving mechanism 12, and move the needle swing position of the feed base 11 and the needle bar 15 to the origin position, and perform sewing. The control processing ends.

On the other hand, S120, S130, S14
If the thread break occurs while the sewing operation is in progress while the process of step S0 is repeatedly performed, an affirmative determination is made in S130 and the process proceeds to S170. Then, in S170, the sewing machine motor 2 is stopped. That is, when the thread breakage detecting sensor 18e detects the breakage of the sewing thread 14, the sewing machine motor 2 is stopped at that time, and the sewing operation in progress is interrupted.

At S180, the stepping motor 6
, The sewing mechanism 10 is operated and the needle bar 1 is controlled.
The needle swing position 5 is moved to the right end position of the swing range. The state of the needle bar 15 and the sewing needle 16 at this time is shown in FIG.
(B). In FIG. 7B, the cutter 13 and the cloth presser 31 are present on the left side on the back side of the sewing needle 16 attached to the lower end of the needle bar 15. Therefore, the needle bar 15 is moved to the position shown in FIG.
When the needle bar 15 is located at the right end of the swing range,
When the hand is moved from the right side of the needle bar 15 to the back side of the needle bar 15, there is no obstacle, so that the threading operation becomes easy. In this state, the operator performs a threading operation for inserting the sewing thread 14 into the needle hole of the sewing needle 16 and prepares for restarting the sewing operation.

Next, in S210, the up switch 4a
Is determined to be in the ON state. If the determination is affirmative, the process proceeds to S260. If the determination is negative, the process proceeds to S220. If the up switch 4a is pressed and the affirmative determination is made in S210, the process proceeds to S260. And S2
At 60, the stepping motor 61 is drive-controlled, the sewing mechanism 10 is operated, the needle bar 15 is moved to the left, and after returning to the state immediately before moving to the right at S180,
Further, the driving of the stepping motors 24 and 61 is controlled,
Needle bar 1 is advanced to the next sewing position by one stitch from the sewing position.
5 and the feed base 11 are moved, and the process proceeds to S280.

If the up switch 4a is not depressed, S21
If a negative determination is made at 0, the process moves to S220. And
In S220, it is determined whether or not the down switch 4b is ON. If the determination is affirmative, the process proceeds to S270, and if the determination is negative, the process proceeds to S230. If the down switch 4b is pressed and the determination in S220 is affirmative,
The process moves to S270. In step S270, the drive control of the stepping motor 61 is performed to operate the sewing mechanism 10 to move the needle bar 15 to the left. In step S180, the needle bar 15 is returned to the state immediately before the needle bar 15 is moved to the right. The drive of the motors 24 and 61 is controlled to return the needle bar 15 and the feed base 11 to the previous sewing position, which is returned by one stitch from the sewing position.
Is moved to S280.

If the down switch 4b is not depressed, S22
If a negative determination is made at 0, the process moves to S230. And
In S230, it is determined whether or not the reset switch 4c is ON. If the determination is affirmative, the process proceeds to S160, and if the determination is negative, the process proceeds to S240. If the reset switch 4c is depressed and an affirmative determination is made in S230, the process proceeds to S160. Then, in S160, as described above, the drive of the stepping motor 24 and the stepping motor 61 is controlled to operate the sewing mechanism 10 and the feed bar drive mechanism 12, and the needle swing position of the feed bar 11 and the needle bar 15 is set to the origin. Position, and the sewing control process ends.

When the reset switch 4c is not pressed,
If a negative determination is made in 30, the process proceeds to S240. Then, in S240, it is determined whether or not the start switch 59 is in the ON state.
Then, if a negative determination is made, the process proceeds to S210.

Here, an up switch 4a, a down switch 4b, a reset switch 4c, a start switch 5
9 are in the OFF state, S210, S22
By repeatedly executing the processes of 0, S230, and S240, the process stands by until a command is input from the worker.

While the processing of S210 to S240 is repeatedly executed, the threading operation is completed and a sewing restart command is input from the operator, that is, the pedal 3 is depressed and the start switch 59 is pressed. Is turned on, S
An affirmative determination is made at 240, and the process proceeds to S250. Then, in S250, the stepping motor 61 is drive-controlled to operate the sewing mechanism 10 to move the needle bar 15 to the left, return to the state immediately before moving to the right in S180, and shift to S120. .

In step S120, as described above, the sewing machine motor 2 is started to rotate the upper shaft 64, and further, according to the rotation of the upper shaft 64, the stepping motor 24 and the stepping motor 61 are drive-controlled. The sewing operation is restarted from the interrupted sewing position. After that, similarly to the above-described sewing operation, the processes of S120, S130, and S140 are repeatedly executed, and the sewing operation is sequentially performed.

If the reset switch 4c is depressed while the processing of S210 to S240 is repeatedly performed, an affirmative determination is made in S230, the above-described processing is executed, and the sewing control processing ends. That is, the sewing operation of the buttonhole sewing machine M is terminated without further proceeding the suspended sewing operation.

On the other hand, if the up switch 4a or the down switch 4b is pressed while the processing of S210 to S240 is repeatedly performed, and the processing of S260 or S270 is executed as described above, the flow shifts to S280. Then, in S280, the up switch 4a is turned on.
State is determined, and if a positive determination is made, S
The process proceeds to 320, and if a negative determination is made, the process proceeds to S290. If the up switch 4a is pressed and the affirmative determination is made in S280, the process proceeds to S320. In step S320, the stepping motors 24 and 61 are drive-controlled to operate the sewing mechanism 10 and the feed base driving mechanism 12 to advance the sewing positions of the needle bar 15 and the feed base 11 by one stitch. Position, and the process moves to S280.

If the up switch 4a is not depressed, and
If a negative determination is made at 0, the flow shifts to S290. And
In S290, it is determined whether or not the down switch 4b is ON. If the determination is affirmative, the process proceeds to S330, and if the determination is negative, the process proceeds to S300. If the down switch 4b is pressed and the determination in S290 is affirmative,
The process moves to S330. In step S330, the sewing machine 10 and the feed base driving mechanism 12 are operated by driving and controlling the stepping motors 24 and 61 to return the sewing positions of the needle bar 15 and the feed base 11 by one stitch. Position, and the process moves to S280. If the down switch 4b is not pressed and a negative determination is made in S290, the process proceeds to S300. Then, in S300, the reset switch 4
It is determined whether or not c is in the ON state. If the determination is affirmative, the process proceeds to S160; if the determination is negative, S310 is performed.
Move to The reset switch 4c is depressed, and S30
If an affirmative determination is made at 0, the process proceeds to S160. And
In S160, as described above, the stepping motor 2
4 and the stepping motor 61, the sewing mechanism 10 and the feed table drive mechanism 12 are operated to move the needle swing position of the feed table 11 and the needle bar 15 to the origin position, and the sewing control processing is ended.

If the reset switch 4c is not depressed and S3
If a negative determination is made in 00, the process proceeds to S310. Then, in S310, it is determined whether or not the start switch 59 is in the ON state.
The process proceeds to S280 if a negative determination is made.

Here, the up switch 4a, down switch 4b, reset switch 4c, start switch 5
9 are in the OFF state, S280, S29
By repeatedly executing 0, S300, and S310, the process stands by until a command is input from a worker.

When the sewing restart command is input from the operator while the processing of S280 to S310 is repeatedly executed, that is, when the pedal 3 is depressed and the start switch 59 is turned on, An affirmative determination is made in S310, and the process proceeds to S120. In the subsequent S120, as described above, the sewing machine motor 2 is activated to rotate the upper shaft 64, and further, according to the rotation of the upper shaft 64, the stepping motor 24 and the stepping motor 61 are drive-controlled.
The sewing operation is restarted from the sewing position set by the processing of S260, S270, S320, and S330. Thereafter, similarly to the sewing operation described above, S120, S130,
By repeatedly executing the processing of S140, the sewing operation is sequentially performed.

If the up switch 4a or the down switch 4b is depressed while the processing of S280 to S310 is repeatedly executed, S280 or S290 is performed.
Is affirmatively determined, and the above-described processing is executed to change the sewing position. That is, the operator can change and set the sewing position at the time of restarting the sewing operation by operating the up switch 4a or the down switch 4b before restarting the sewing operation.

Further, if the reset switch 4c is depressed while the processing of S280 to S310 is repeatedly executed, an affirmative determination is made in S300, the processing described above is executed, and the sewing control processing ends. That is, the sewing operation of the buttonhole sewing machine M is terminated without further proceeding the suspended sewing operation.

As described above, in the sewing control processing, when the processing is started, the sewing operation is advanced to the sewing end position, or the end command is input by operating the reset switch 4c. , The process ends. Then, when the sewing control process is started and the sewing operation is advanced to the sewing end position, the buttonhole stitch 70 is formed.

When the buttonhole stitch 70 is thus formed, the controller 5 executes a cutter drive control process provided separately. In the cutter drive control process, the cutter drive solenoid 45 is drive-controlled to drive the cutter 13 up and down, so that the edge of the
The buttonhole 80 is formed by cutting the work cloth between 1 and 72.

As described above, in the buttonhole sewing machine M according to the present embodiment, the buttonhole forming operation is completed by executing the sewing control means and the cutter drive control means. However, when the sewing control means is terminated by the operation of the reset switch 4c, that is, by the termination command from the operator,
Since the cutter drive control process is not performed, no button hole is opened in the work cloth.

In the buttonhole sewing machine M according to the present embodiment, the sewing control processing is performed by the sewing control means in the claims, S130 and S170 of the sewing control processing are performed by the sewing operation interrupting means, and S180 of the sewing control processing is performed by the sewing control interrupting means. Are provided to the needle bar retreat control means in S210, S220, S24 of the sewing control processing.
0 to S290 and S310 to S330 correspond to sewing operation restarting means, respectively.

As described above, when a thread break occurs during the sewing operation, the hole sewing machine M of the present embodiment stops the sewing operation and moves the needle bar 15 to the right end of the swing range. After detecting the thread break and interrupting the sewing operation,
When the operator steps on the pedal 3, the needle bar 15 is moved to the interrupted sewing position, and the sewing operation is restarted. further,
The sewing position when the sewing operation is restarted can be changed and set by the operation of the operator.

Accordingly, the buttonhole sewing machine M of this embodiment is
According to this, when a thread break occurs and the sewing operation is interrupted, the threading operation for inserting the sewing thread 14 into the sewing needle 16 can be easily performed without the operator manually operating the needle bar 15. In addition, in order to complete an unfinished overhole stitch formed halfway, restarting the sewing operation can be easily performed by a simple operation of depressing the pedal 3.

Further, the sewing position when the sewing operation is restarted can be set according to the sewing progress of the unfinished buttonhole stitch, and the seam at the buttonhole seam before and after the interruption can be adjusted. . Next, a description will be given of a hole sewing machine M according to a second embodiment of the present invention. The overlock sewing machine M of the second embodiment is
The mechanical configuration is the same as that of the buttonhole sewing machine M of the first embodiment, and the sewing control process executed by the control device 5 is different.

FIG. 9 shows a flowchart of the sewing control process according to the second embodiment, which will be described below. Note that the sewing control process of the second embodiment is configured by making some changes based on the sewing control process of the first embodiment, and therefore, only the changes from the first embodiment will be described. .

A first change is that S410 is executed in the sewing control process of the second embodiment instead of S180 in the sewing control process of the first embodiment. That is, in the sewing control process of the second embodiment, when S170 is executed, the process proceeds to S410. Then, in S410,
Excitation to the needle swinging motor, that is, the stepping motor 61 is stopped, so that the needle bar 15 is in a state where the force for stopping the swing does not work. Therefore, the needle bar 1
5 can be swung by an external force, and the operator can move the needle bar 15 to a position where the threading operation can be easily performed.

Then, when the process of S410 is executed,
The process proceeds to S210, and as described above, S210 to S240
By repeatedly executing the processing of the above, the CPU waits until a command is input from the worker, and continues the sewing control operation. Next, a second change is that S420, S430, and S440 are added, and S450, S460, and S470 are executed instead of S250, S260, and S270. Then, S420 is executed after an affirmative determination in S210, S430 is executed after an affirmative determination in S220, and S440 is executed after an affirmative determination in S240.

In each of these steps S420, S430 and S440, the same processing is performed. In each of these steps, the drive of the stepping motor 61 is controlled and
The needle bar 15 is moved by operating the sewing mechanism 10 and the origin position of the needle bar 15 is detected. In particular,
The origin position is detected based on the signal from the origin detection sensor 65 described above.

In the second embodiment, since the needle bar 15 is moved by the operator in performing the above-described threading operation, the control device 5 can correctly recognize the current position of the needle bar 15. Disappears. Therefore, it is necessary for the control device 5 to accurately recognize the current position of the needle bar 15 before restarting the sewing operation. Therefore, S420, S430, S4
By adding the process 40, the origin position of the needle bar 15 is detected, and the control device 5 recognizes the current position of the needle bar 15.

When S420, S430 and S440 are executed, S460, S470 and S45 are executed, respectively.
Shift to the process of 0. In S460, the drive of the stepping motors 24 and 61 is controlled to move the needle bar 15 and the feed base 11 to the next sewing position advanced by one stitch from the sewing position stopped in S170, and the process proceeds to S280. S47
At 0, the stepping motors 24 and 61 are drive-controlled to return one stitch from the sewing position stopped at S170.
Move the needle bar 15 and the feed base 11 to the previous sewing position,
The process moves to S280. In S450, the drive of the stepping motor 61 is controlled, the needle bar 15 is moved to the sewing position stopped in S170, and the process proceeds to S280.

These two points are changes from the first embodiment to the second embodiment. In the sewing control process of the second embodiment, as in the first embodiment, when the process is started, the sewing operation proceeds to the sewing end position, or an end command is issued by operating the reset switch 4c. , The process is terminated.

As described above, in the buttonhole sewing machine M of the second embodiment, when a thread break occurs during the sewing operation, the sewing operation is interrupted, the excitation of the stepping motor 61 is stopped, and the needle bar is stopped. 15 is made movable by external force. After detecting the thread break and interrupting the sewing operation, when the operator inputs a command, the needle bar 15 is swung to detect the origin position of the needle bar 15. Then, the control device 5 recognizes the current position of the needle bar 15 based on the detected origin position, moves the needle bar 15 to the sewing position, and restarts the sewing operation.

Therefore, according to the overlock sewing machine M of the second embodiment, when the thread break occurs and the sewing operation is interrupted, the operator can freely move the needle bar 15, A threading operation for inserting the sewing thread 14 into the sewing needle 16 can be easily performed. And by performing origin detection,
Forming a buttonhole seam without a decrease in product value, which can prevent a gap between a buttonhole seam due to a sewing operation after restarting and a seam formed before the sewing operation is interrupted. Becomes possible.

Further, in the buttonhole sewing machine M according to the second embodiment, the sewing position when the sewing operation is restarted can be changed and set by the operation of the operator, similarly to the first embodiment. Further, in order to complete the unfinished buttonhole seam formed halfway, the sewing operation can be restarted by a simple operation of depressing the pedal 3.
The button hole can be easily formed and the button hole can be efficiently formed. Further, since it is possible to set the sewing position when the sewing operation is restarted according to the state of the unfinished buttonhole seam, the seam at the buttonhole seam before and after the interruption can be adjusted.

The overlock sewing machine M according to the second embodiment.
Then, S410 of the sewing control process corresponds to a power supply stop unit in the claims. Further, the present invention is not limited to the above-mentioned embodiment at all, and can be implemented in various forms without departing from the gist of the present invention.
For example, in the sewing control process of the first embodiment, the sewing machine detects the origin position of the needle bar 15 before restarting the sewing operation, and moves the needle bar 15 to the sewing position based on the detected origin position. Is also good. As a result, the needle bar 15 is moved by an erroneous external force, and the needle bar 1 recognized by the control device 5 is moved.
It is possible to prevent the sewing operation from being restarted in a state where an error occurs between the position of the needle bar 5 and the actual position of the needle bar 15.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an appearance of an overlock sewing machine according to an embodiment.

FIG. 2 is a right side view illustrating a main configuration of a sewing mechanism of the sewing machine according to the embodiment.

FIG. 3 is a perspective view illustrating a configuration of a feed base driving mechanism of the sewing machine according to the embodiment.

FIG. 4 is a perspective view illustrating a configuration of a needle bar driving mechanism of the sewing machine according to the embodiment.

FIG. 5 is an explanatory view showing a configuration of a general overhole stitch.

FIG. 6 is an explanatory diagram illustrating a configuration of a control system of the sewing machine according to the embodiment.

FIG. 7 is a front view illustrating a configuration of a lower portion of an arm portion of the sewing machine according to the embodiment.

FIG. 8 is a flowchart illustrating a sewing control process according to the first embodiment.

FIG. 9 is a flowchart illustrating a sewing control process according to the second embodiment.

[Explanation of symbols]

1: sewing machine table, 2: sewing machine motor, 3: pedal,
4 operation panel, 5 control device, 10 sewing mechanism, 12
... Slide drive mechanism, 14 ... Sewing thread, 15 ... Needle bar, 16 ...
Sewing needle, 17: needle bar drive mechanism, 18: thread breakage detection mechanism,
24 ... stepping motor, 59 ... start switch,
61: stepping motor, 62: swing lever, 62a
... Projection for position detection, 65. Origin detection sensor, 70. Overhole stitch, 80. Buttonhole, M. Overhole sewing machine.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toru Shibata 15-1, Nashiro-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture Inside Brother Industries, Ltd. (72) Inventor Takashi Kondo 15-1, Naeshiro-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture No. Within Brother Industries, Ltd. (72) Atsushi Kamano 15-1 Naeshiro-cho, Mizuho-ku, Nagoya, Aichi Prefecture Inside (72) Inventors Shigeru ▲ Saki ▼ Kunizo Naeshiro-cho, Mizuho-ku, Nagoya, Aichi Prefecture 15-1 Inside Brother Industries, Ltd. (72) Inventor Yukio Nishida 15-1, Nashiro-machi, Mizuho-ku, Nagoya-shi, Aichi F-term inside Brother Industries, Ltd. 3B150 AA24 BA06 CA05 CD05 CE23 DB03 EE03 EE08 GD25 GE13 GF02 GF03 GG10 JA07 JA11 LA52 LA83 LB01 LB02 NA02 NA13 NA67 NA71 NB02 NC06 NC11 QA02 QA06 QA07

Claims (4)

[Claims] 1. An upper shaft driving means for rotating an upper shaft to reciprocate a needle bar on which a sewing needle is removably mounted, and a feed stage drive for driving a feed stage to feed a work cloth by a cloth. Means, an oscillating driving means comprising an electric motor for oscillating the needle bar in a direction intersecting the cloth feeding direction by the feed table, and simultaneously controlling the driving of each of the driving means in accordance with an external sewing command. A sewing control means for forming a buttonhole stitch on the work cloth; a cutting means for cutting a work cloth between the keyhole seams formed by the sewing control means to form a button hole; and the sewing needle. A thread breakage detecting means for detecting a thread breakage of a thread inserted through the sewing machine; and when a thread breakage is detected by the thread breakage detecting means, the drive control by the sewing control means is interrupted, and At the time of disconnection detection A sewing operation interrupting means for stopping at a driving position of the sewing machine, wherein the sewing operation interrupting means interrupts the drive control by the sewing control means, and then supplies power to the swing driving means. An over-hole sewing machine, comprising: a power supply stopping unit that stops supply and enables the needle bar to swing manually. 2. An upper shaft driving means for rotating an upper shaft to reciprocate a needle bar on which a sewing needle is removably mounted up and down, and a feed stage drive for feeding a work cloth by driving a feed stage. Means, an oscillating driving means comprising an electric motor for oscillating the needle bar in a direction intersecting the cloth feeding direction by the feed table, and simultaneously controlling the driving of each of the driving means in accordance with an external sewing command. A sewing control means for forming a buttonhole stitch on the work cloth; a cutting means for cutting a work cloth between the keyhole seams formed by the sewing control means to form a button hole; and the sewing needle. A thread breakage detecting means for detecting a thread breakage of a thread inserted through the sewing machine; and when a thread breakage is detected by the thread breakage detecting means, the drive control by the sewing control means is interrupted, and At the time of disconnection detection And a sewing operation interrupting means for stopping at the driving position of the sewing machine, wherein the sewing operation interrupting means interrupts the drive control by the sewing control means, and then controls the swing drive means. And a needle bar retraction control means for moving the needle bar to a retreat position where the needle bar is separated from the cutting means and easy to thread. 3. When the sewing operation interrupting means interrupts the drive control by the sewing control means and receives a sewing restart command from the outside, the sewing drive interrupting means drives and controls the swing driving means, thereby controlling the needle. The sewing machine according to claim 1 or 2, further comprising a sewing operation resuming means for returning the rod to the driving position at the time when the thread breakage is detected, and thereafter resuming the driving control by the sewing control means. Sewing machine. 4. An origin detecting means for detecting an origin position which is a reference of a swinging position of the needle bar by drivingly controlling the swing driving unit to swing the needle bar; When the drive control by the sewing control means is restarted, the operation resuming means moves the needle bar up to the drive position at the time when the thread break is detected based on the origin position of the needle bar detected by the origin detection means. The hole sewing machine according to claim 3, wherein the sewing machine is returned.